_ Git - rust-lightning/blob - lightning/src/ln/functional_tests.rs

   1 // This file is Copyright its original authors, visible in version control
   2 // history.
   3 //
   4 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
   5 // or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
   7 // You may not use this file except in accordance with one or both of these
   8 // licenses.
   9
  10 //! Tests that test standing up a network of ChannelManagers, creating channels, sending
  11 //! payments/messages between them, and often checking the resulting ChannelMonitors are able to
  12 //! claim outputs on-chain.
  13
  14 use chain;
  15 use chain::{Confirm, Listen, Watch};
  16 use chain::channelmonitor;
  17 use chain::channelmonitor::{ChannelMonitor, CLTV_CLAIM_BUFFER, LATENCY_GRACE_PERIOD_BLOCKS, ANTI_REORG_DELAY};
  18 use chain::transaction::OutPoint;
  19 use chain::keysinterface::BaseSign;
  20 use ln::{PaymentPreimage, PaymentSecret, PaymentHash};
  21 use ln::channel::{COMMITMENT_TX_BASE_WEIGHT, COMMITMENT_TX_WEIGHT_PER_HTLC};
  22 use ln::channelmanager::{ChannelManager, ChannelManagerReadArgs, MppId, RAACommitmentOrder, PaymentSendFailure, BREAKDOWN_TIMEOUT, MIN_CLTV_EXPIRY_DELTA};
  23 use ln::channel::{Channel, ChannelError};
  24 use ln::{chan_utils, onion_utils};
  25 use ln::chan_utils::HTLC_SUCCESS_TX_WEIGHT;
  26 use routing::router::{Route, RouteHop, RouteHint, RouteHintHop, get_route, get_keysend_route};
  27 use routing::network_graph::{NetworkUpdate, RoutingFees};
  28 use ln::features::{ChannelFeatures, InitFeatures, InvoiceFeatures, NodeFeatures};
  29 use ln::msgs;
  30 use ln::msgs::{ChannelMessageHandler, RoutingMessageHandler, ErrorAction};
  31 use util::enforcing_trait_impls::EnforcingSigner;
  32 use util::{byte_utils, test_utils};
  33 use util::events::{Event, MessageSendEvent, MessageSendEventsProvider, PaymentPurpose, ClosureReason};
  34 use util::errors::APIError;
  35 use util::ser::{Writeable, ReadableArgs};
  36 use util::config::UserConfig;
  37
  38 use bitcoin::hash_types::{Txid, BlockHash};
  39 use bitcoin::blockdata::block::{Block, BlockHeader};
  40 use bitcoin::blockdata::script::Builder;
  41 use bitcoin::blockdata::opcodes;
  42 use bitcoin::blockdata::constants::genesis_block;
  43 use bitcoin::network::constants::Network;
  44
  45 use bitcoin::hashes::sha256::Hash as Sha256;
  46 use bitcoin::hashes::Hash;
  47
  48 use bitcoin::secp256k1::Secp256k1;
  49 use bitcoin::secp256k1::key::{PublicKey,SecretKey};
  50
  51 use regex;
  52
  53 use io;
  54 use prelude::*;
  55 use alloc::collections::BTreeSet;
  56 use core::default::Default;
  57 use sync::{Arc, Mutex};
  58
  59 use ln::functional_test_utils::*;
  60 use ln::chan_utils::CommitmentTransaction;
  61
  62 #[test]
  63 fn test_insane_channel_opens() {
  64         // Stand up a network of 2 nodes
  65         let chanmon_cfgs = create_chanmon_cfgs(2);
  66         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
  67         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
  68         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
  69
  70         // Instantiate channel parameters where we push the maximum msats given our
  71         // funding satoshis
  72         let channel_value_sat = 31337; // same as funding satoshis
  73         let channel_reserve_satoshis = Channel::<EnforcingSigner>::get_holder_selected_channel_reserve_satoshis(channel_value_sat);
  74         let push_msat = (channel_value_sat - channel_reserve_satoshis) * 1000;
  75
  76         // Have node0 initiate a channel to node1 with aforementioned parameters
  77         nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), channel_value_sat, push_msat, 42, None).unwrap();
  78
  79         // Extract the channel open message from node0 to node1
  80         let open_channel_message = get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id());
  81
  82         // Test helper that asserts we get the correct error string given a mutator
  83         // that supposedly makes the channel open message insane
  84         let insane_open_helper = |expected_error_str: &str, message_mutator: fn(msgs::OpenChannel) -> msgs::OpenChannel| {
  85                 nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), InitFeatures::known(), &message_mutator(open_channel_message.clone()));
  86                 let msg_events = nodes[1].node.get_and_clear_pending_msg_events();
  87                 assert_eq!(msg_events.len(), 1);
  88                 let expected_regex = regex::Regex::new(expected_error_str).unwrap();
  89                 if let MessageSendEvent::HandleError { ref action, .. } = msg_events[0] {
  90                         match action {
  91                                 &ErrorAction::SendErrorMessage { .. } => {
  92                                         nodes[1].logger.assert_log_regex("lightning::ln::channelmanager".to_string(), expected_regex, 1);
  93                                 },
  94                                 _ => panic!("unexpected event!"),
  95                         }
  96                 } else { assert!(false); }
  97         };
  98
  99         use ln::channel::MAX_FUNDING_SATOSHIS;
 100         use ln::channelmanager::MAX_LOCAL_BREAKDOWN_TIMEOUT;
 101
 102         // Test all mutations that would make the channel open message insane
 103         insane_open_helper(format!("Funding must be smaller than {}. It was {}", MAX_FUNDING_SATOSHIS, MAX_FUNDING_SATOSHIS).as_str(), |mut msg| { msg.funding_satoshis = MAX_FUNDING_SATOSHIS; msg });
 104
 105         insane_open_helper("Bogus channel_reserve_satoshis", |mut msg| { msg.channel_reserve_satoshis = msg.funding_satoshis + 1; msg });
 106
 107         insane_open_helper(r"push_msat \d+ was larger than funding value \d+", |mut msg| { msg.push_msat = (msg.funding_satoshis - msg.channel_reserve_satoshis) * 1000 + 1; msg });
 108
 109         insane_open_helper("Peer never wants payout outputs?", |mut msg| { msg.dust_limit_satoshis = msg.funding_satoshis + 1 ; msg });
 110
 111         insane_open_helper(r"Bogus; channel reserve \(\d+\) is less than dust limit \(\d+\)", |mut msg| { msg.dust_limit_satoshis = msg.channel_reserve_satoshis + 1; msg });
 112
 113         insane_open_helper(r"Minimum htlc value \(\d+\) was larger than full channel value \(\d+\)", |mut msg| { msg.htlc_minimum_msat = (msg.funding_satoshis - msg.channel_reserve_satoshis) * 1000; msg });
 114
 115         insane_open_helper("They wanted our payments to be delayed by a needlessly long period", |mut msg| { msg.to_self_delay = MAX_LOCAL_BREAKDOWN_TIMEOUT + 1; msg });
 116
 117         insane_open_helper("0 max_accepted_htlcs makes for a useless channel", |mut msg| { msg.max_accepted_htlcs = 0; msg });
 118
 119         insane_open_helper("max_accepted_htlcs was 484. It must not be larger than 483", |mut msg| { msg.max_accepted_htlcs = 484; msg });
 120 }
 121
 122 #[test]
 123 fn test_async_inbound_update_fee() {
 124         let chanmon_cfgs = create_chanmon_cfgs(2);
 125         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 126         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 127         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 128         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
 129         let logger = test_utils::TestLogger::new();
 130
 131         // balancing
 132         send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
 133
 134         // A                                        B
 135         // update_fee                            ->
 136         // send (1) commitment_signed            -.
 137         //                                       <- update_add_htlc/commitment_signed
 138         // send (2) RAA (awaiting remote revoke) -.
 139         // (1) commitment_signed is delivered    ->
 140         //                                       .- send (3) RAA (awaiting remote revoke)
 141         // (2) RAA is delivered                  ->
 142         //                                       .- send (4) commitment_signed
 143         //                                       <- (3) RAA is delivered
 144         // send (5) commitment_signed            -.
 145         //                                       <- (4) commitment_signed is delivered
 146         // send (6) RAA                          -.
 147         // (5) commitment_signed is delivered    ->
 148         //                                       <- RAA
 149         // (6) RAA is delivered                  ->
 150
 151         // First nodes[0] generates an update_fee
 152         {
 153                 let mut feerate_lock = chanmon_cfgs[0].fee_estimator.sat_per_kw.lock().unwrap();
 154                 *feerate_lock += 20;
 155         }
 156         nodes[0].node.timer_tick_occurred();
 157         check_added_monitors!(nodes[0], 1);
 158
 159         let events_0 = nodes[0].node.get_and_clear_pending_msg_events();
 160         assert_eq!(events_0.len(), 1);
 161         let (update_msg, commitment_signed) = match events_0[0] { // (1)
 162                 MessageSendEvent::UpdateHTLCs { updates: msgs::CommitmentUpdate { ref update_fee, ref commitment_signed, .. }, .. } => {
 163                         (update_fee.as_ref(), commitment_signed)
 164                 },
 165                 _ => panic!("Unexpected event"),
 166         };
 167
 168         nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg.unwrap());
 169
 170         // ...but before it's delivered, nodes[1] starts to send a payment back to nodes[0]...
 171         let (_, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[0]);
 172         let net_graph_msg_handler = &nodes[1].net_graph_msg_handler;
 173         nodes[1].node.send_payment(&get_route(&nodes[1].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[0].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 40000, TEST_FINAL_CLTV, &logger).unwrap(), our_payment_hash, &Some(our_payment_secret)).unwrap();
 174         check_added_monitors!(nodes[1], 1);
 175
 176         let payment_event = {
 177                 let mut events_1 = nodes[1].node.get_and_clear_pending_msg_events();
 178                 assert_eq!(events_1.len(), 1);
 179                 SendEvent::from_event(events_1.remove(0))
 180         };
 181         assert_eq!(payment_event.node_id, nodes[0].node.get_our_node_id());
 182         assert_eq!(payment_event.msgs.len(), 1);
 183
 184         // ...now when the messages get delivered everyone should be happy
 185         nodes[0].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &payment_event.msgs[0]);
 186         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &payment_event.commitment_msg); // (2)
 187         let as_revoke_and_ack = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
 188         // nodes[0] is awaiting nodes[1] revoke_and_ack so get_event_msg's assert(len == 1) passes
 189         check_added_monitors!(nodes[0], 1);
 190
 191         // deliver(1), generate (3):
 192         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), commitment_signed);
 193         let bs_revoke_and_ack = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
 194         // nodes[1] is awaiting nodes[0] revoke_and_ack so get_event_msg's assert(len == 1) passes
 195         check_added_monitors!(nodes[1], 1);
 196
 197         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_revoke_and_ack); // deliver (2)
 198         let bs_update = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
 199         assert!(bs_update.update_add_htlcs.is_empty()); // (4)
 200         assert!(bs_update.update_fulfill_htlcs.is_empty()); // (4)
 201         assert!(bs_update.update_fail_htlcs.is_empty()); // (4)
 202         assert!(bs_update.update_fail_malformed_htlcs.is_empty()); // (4)
 203         assert!(bs_update.update_fee.is_none()); // (4)
 204         check_added_monitors!(nodes[1], 1);
 205
 206         nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_revoke_and_ack); // deliver (3)
 207         let as_update = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
 208         assert!(as_update.update_add_htlcs.is_empty()); // (5)
 209         assert!(as_update.update_fulfill_htlcs.is_empty()); // (5)
 210         assert!(as_update.update_fail_htlcs.is_empty()); // (5)
 211         assert!(as_update.update_fail_malformed_htlcs.is_empty()); // (5)
 212         assert!(as_update.update_fee.is_none()); // (5)
 213         check_added_monitors!(nodes[0], 1);
 214
 215         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &bs_update.commitment_signed); // deliver (4)
 216         let as_second_revoke = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
 217         // only (6) so get_event_msg's assert(len == 1) passes
 218         check_added_monitors!(nodes[0], 1);
 219
 220         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &as_update.commitment_signed); // deliver (5)
 221         let bs_second_revoke = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
 222         check_added_monitors!(nodes[1], 1);
 223
 224         nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_second_revoke);
 225         check_added_monitors!(nodes[0], 1);
 226
 227         let events_2 = nodes[0].node.get_and_clear_pending_events();
 228         assert_eq!(events_2.len(), 1);
 229         match events_2[0] {
 230                 Event::PendingHTLCsForwardable {..} => {}, // If we actually processed we'd receive the payment
 231                 _ => panic!("Unexpected event"),
 232         }
 233
 234         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_second_revoke); // deliver (6)
 235         check_added_monitors!(nodes[1], 1);
 236 }
 237
 238 #[test]
 239 fn test_update_fee_unordered_raa() {
 240         // Just the intro to the previous test followed by an out-of-order RAA (which caused a
 241         // crash in an earlier version of the update_fee patch)
 242         let chanmon_cfgs = create_chanmon_cfgs(2);
 243         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 244         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 245         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 246         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
 247         let logger = test_utils::TestLogger::new();
 248
 249         // balancing
 250         send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
 251
 252         // First nodes[0] generates an update_fee
 253         {
 254                 let mut feerate_lock = chanmon_cfgs[0].fee_estimator.sat_per_kw.lock().unwrap();
 255                 *feerate_lock += 20;
 256         }
 257         nodes[0].node.timer_tick_occurred();
 258         check_added_monitors!(nodes[0], 1);
 259
 260         let events_0 = nodes[0].node.get_and_clear_pending_msg_events();
 261         assert_eq!(events_0.len(), 1);
 262         let update_msg = match events_0[0] { // (1)
 263                 MessageSendEvent::UpdateHTLCs { updates: msgs::CommitmentUpdate { ref update_fee, .. }, .. } => {
 264                         update_fee.as_ref()
 265                 },
 266                 _ => panic!("Unexpected event"),
 267         };
 268
 269         nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg.unwrap());
 270
 271         // ...but before it's delivered, nodes[1] starts to send a payment back to nodes[0]...
 272         let (_, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[0]);
 273         let net_graph_msg_handler = &nodes[1].net_graph_msg_handler;
 274         nodes[1].node.send_payment(&get_route(&nodes[1].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[0].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 40000, TEST_FINAL_CLTV, &logger).unwrap(), our_payment_hash, &Some(our_payment_secret)).unwrap();
 275         check_added_monitors!(nodes[1], 1);
 276
 277         let payment_event = {
 278                 let mut events_1 = nodes[1].node.get_and_clear_pending_msg_events();
 279                 assert_eq!(events_1.len(), 1);
 280                 SendEvent::from_event(events_1.remove(0))
 281         };
 282         assert_eq!(payment_event.node_id, nodes[0].node.get_our_node_id());
 283         assert_eq!(payment_event.msgs.len(), 1);
 284
 285         // ...now when the messages get delivered everyone should be happy
 286         nodes[0].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &payment_event.msgs[0]);
 287         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &payment_event.commitment_msg); // (2)
 288         let as_revoke_msg = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
 289         // nodes[0] is awaiting nodes[1] revoke_and_ack so get_event_msg's assert(len == 1) passes
 290         check_added_monitors!(nodes[0], 1);
 291
 292         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_revoke_msg); // deliver (2)
 293         check_added_monitors!(nodes[1], 1);
 294
 295         // We can't continue, sadly, because our (1) now has a bogus signature
 296 }
 297
 298 #[test]
 299 fn test_multi_flight_update_fee() {
 300         let chanmon_cfgs = create_chanmon_cfgs(2);
 301         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 302         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 303         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 304         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
 305
 306         // A                                        B
 307         // update_fee/commitment_signed          ->
 308         //                                       .- send (1) RAA and (2) commitment_signed
 309         // update_fee (never committed)          ->
 310         // (3) update_fee                        ->
 311         // We have to manually generate the above update_fee, it is allowed by the protocol but we
 312         // don't track which updates correspond to which revoke_and_ack responses so we're in
 313         // AwaitingRAA mode and will not generate the update_fee yet.
 314         //                                       <- (1) RAA delivered
 315         // (3) is generated and send (4) CS      -.
 316         // Note that A cannot generate (4) prior to (1) being delivered as it otherwise doesn't
 317         // know the per_commitment_point to use for it.
 318         //                                       <- (2) commitment_signed delivered
 319         // revoke_and_ack                        ->
 320         //                                          B should send no response here
 321         // (4) commitment_signed delivered       ->
 322         //                                       <- RAA/commitment_signed delivered
 323         // revoke_and_ack                        ->
 324
 325         // First nodes[0] generates an update_fee
 326         let initial_feerate;
 327         {
 328                 let mut feerate_lock = chanmon_cfgs[0].fee_estimator.sat_per_kw.lock().unwrap();
 329                 initial_feerate = *feerate_lock;
 330                 *feerate_lock = initial_feerate + 20;
 331         }
 332         nodes[0].node.timer_tick_occurred();
 333         check_added_monitors!(nodes[0], 1);
 334
 335         let events_0 = nodes[0].node.get_and_clear_pending_msg_events();
 336         assert_eq!(events_0.len(), 1);
 337         let (update_msg_1, commitment_signed_1) = match events_0[0] { // (1)
 338                 MessageSendEvent::UpdateHTLCs { updates: msgs::CommitmentUpdate { ref update_fee, ref commitment_signed, .. }, .. } => {
 339                         (update_fee.as_ref().unwrap(), commitment_signed)
 340                 },
 341                 _ => panic!("Unexpected event"),
 342         };
 343
 344         // Deliver first update_fee/commitment_signed pair, generating (1) and (2):
 345         nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg_1);
 346         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), commitment_signed_1);
 347         let (bs_revoke_msg, bs_commitment_signed) = get_revoke_commit_msgs!(nodes[1], nodes[0].node.get_our_node_id());
 348         check_added_monitors!(nodes[1], 1);
 349
 350         // nodes[0] is awaiting a revoke from nodes[1] before it will create a new commitment
 351         // transaction:
 352         {
 353                 let mut feerate_lock = chanmon_cfgs[0].fee_estimator.sat_per_kw.lock().unwrap();
 354                 *feerate_lock = initial_feerate + 40;
 355         }
 356         nodes[0].node.timer_tick_occurred();
 357         assert!(nodes[0].node.get_and_clear_pending_events().is_empty());
 358         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
 359
 360         // Create the (3) update_fee message that nodes[0] will generate before it does...
 361         let mut update_msg_2 = msgs::UpdateFee {
 362                 channel_id: update_msg_1.channel_id.clone(),
 363                 feerate_per_kw: (initial_feerate + 30) as u32,
 364         };
 365
 366         nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), &update_msg_2);
 367
 368         update_msg_2.feerate_per_kw = (initial_feerate + 40) as u32;
 369         // Deliver (3)
 370         nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), &update_msg_2);
 371
 372         // Deliver (1), generating (3) and (4)
 373         nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_revoke_msg);
 374         let as_second_update = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
 375         check_added_monitors!(nodes[0], 1);
 376         assert!(as_second_update.update_add_htlcs.is_empty());
 377         assert!(as_second_update.update_fulfill_htlcs.is_empty());
 378         assert!(as_second_update.update_fail_htlcs.is_empty());
 379         assert!(as_second_update.update_fail_malformed_htlcs.is_empty());
 380         // Check that the update_fee newly generated matches what we delivered:
 381         assert_eq!(as_second_update.update_fee.as_ref().unwrap().channel_id, update_msg_2.channel_id);
 382         assert_eq!(as_second_update.update_fee.as_ref().unwrap().feerate_per_kw, update_msg_2.feerate_per_kw);
 383
 384         // Deliver (2) commitment_signed
 385         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &bs_commitment_signed);
 386         let as_revoke_msg = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
 387         check_added_monitors!(nodes[0], 1);
 388         // No commitment_signed so get_event_msg's assert(len == 1) passes
 389
 390         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_revoke_msg);
 391         assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
 392         check_added_monitors!(nodes[1], 1);
 393
 394         // Delever (4)
 395         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &as_second_update.commitment_signed);
 396         let (bs_second_revoke, bs_second_commitment) = get_revoke_commit_msgs!(nodes[1], nodes[0].node.get_our_node_id());
 397         check_added_monitors!(nodes[1], 1);
 398
 399         nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_second_revoke);
 400         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
 401         check_added_monitors!(nodes[0], 1);
 402
 403         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &bs_second_commitment);
 404         let as_second_revoke = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
 405         // No commitment_signed so get_event_msg's assert(len == 1) passes
 406         check_added_monitors!(nodes[0], 1);
 407
 408         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_second_revoke);
 409         assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
 410         check_added_monitors!(nodes[1], 1);
 411 }
 412
 413 fn do_test_1_conf_open(connect_style: ConnectStyle) {
 414         // Previously, if the minium_depth config was set to 1, we'd never send a funding_locked. This
 415         // tests that we properly send one in that case.
 416         let mut alice_config = UserConfig::default();
 417         alice_config.own_channel_config.minimum_depth = 1;
 418         alice_config.channel_options.announced_channel = true;
 419         alice_config.peer_channel_config_limits.force_announced_channel_preference = false;
 420         let mut bob_config = UserConfig::default();
 421         bob_config.own_channel_config.minimum_depth = 1;
 422         bob_config.channel_options.announced_channel = true;
 423         bob_config.peer_channel_config_limits.force_announced_channel_preference = false;
 424         let chanmon_cfgs = create_chanmon_cfgs(2);
 425         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 426         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[Some(alice_config), Some(bob_config)]);
 427         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 428         *nodes[0].connect_style.borrow_mut() = connect_style;
 429
 430         let tx = create_chan_between_nodes_with_value_init(&nodes[0], &nodes[1], 100000, 10001, InitFeatures::known(), InitFeatures::known());
 431         mine_transaction(&nodes[1], &tx);
 432         nodes[0].node.handle_funding_locked(&nodes[1].node.get_our_node_id(), &get_event_msg!(nodes[1], MessageSendEvent::SendFundingLocked, nodes[0].node.get_our_node_id()));
 433
 434         mine_transaction(&nodes[0], &tx);
 435         let (funding_locked, _) = create_chan_between_nodes_with_value_confirm_second(&nodes[1], &nodes[0]);
 436         let (announcement, as_update, bs_update) = create_chan_between_nodes_with_value_b(&nodes[0], &nodes[1], &funding_locked);
 437
 438         for node in nodes {
 439                 assert!(node.net_graph_msg_handler.handle_channel_announcement(&announcement).unwrap());
 440                 node.net_graph_msg_handler.handle_channel_update(&as_update).unwrap();
 441                 node.net_graph_msg_handler.handle_channel_update(&bs_update).unwrap();
 442         }
 443 }
 444 #[test]
 445 fn test_1_conf_open() {
 446         do_test_1_conf_open(ConnectStyle::BestBlockFirst);
 447         do_test_1_conf_open(ConnectStyle::TransactionsFirst);
 448         do_test_1_conf_open(ConnectStyle::FullBlockViaListen);
 449 }
 450
 451 fn do_test_sanity_on_in_flight_opens(steps: u8) {
 452         // Previously, we had issues deserializing channels when we hadn't connected the first block
 453         // after creation. To catch that and similar issues, we lean on the Node::drop impl to test
 454         // serialization round-trips and simply do steps towards opening a channel and then drop the
 455         // Node objects.
 456
 457         let chanmon_cfgs = create_chanmon_cfgs(2);
 458         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 459         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 460         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 461
 462         if steps & 0b1000_0000 != 0{
 463                 let block = Block {
 464                         header: BlockHeader { version: 0x20000000, prev_blockhash: nodes[0].best_block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 },
 465                         txdata: vec![],
 466                 };
 467                 connect_block(&nodes[0], &block);
 468                 connect_block(&nodes[1], &block);
 469         }
 470
 471         if steps & 0x0f == 0 { return; }
 472         nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), 100000, 10001, 42, None).unwrap();
 473         let open_channel = get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id());
 474
 475         if steps & 0x0f == 1 { return; }
 476         nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), InitFeatures::known(), &open_channel);
 477         let accept_channel = get_event_msg!(nodes[1], MessageSendEvent::SendAcceptChannel, nodes[0].node.get_our_node_id());
 478
 479         if steps & 0x0f == 2 { return; }
 480         nodes[0].node.handle_accept_channel(&nodes[1].node.get_our_node_id(), InitFeatures::known(), &accept_channel);
 481
 482         let (temporary_channel_id, tx, funding_output) = create_funding_transaction(&nodes[0], 100000, 42);
 483
 484         if steps & 0x0f == 3 { return; }
 485         nodes[0].node.funding_transaction_generated(&temporary_channel_id, tx.clone()).unwrap();
 486         check_added_monitors!(nodes[0], 0);
 487         let funding_created = get_event_msg!(nodes[0], MessageSendEvent::SendFundingCreated, nodes[1].node.get_our_node_id());
 488
 489         if steps & 0x0f == 4 { return; }
 490         nodes[1].node.handle_funding_created(&nodes[0].node.get_our_node_id(), &funding_created);
 491         {
 492                 let mut added_monitors = nodes[1].chain_monitor.added_monitors.lock().unwrap();
 493                 assert_eq!(added_monitors.len(), 1);
 494                 assert_eq!(added_monitors[0].0, funding_output);
 495                 added_monitors.clear();
 496         }
 497         let funding_signed = get_event_msg!(nodes[1], MessageSendEvent::SendFundingSigned, nodes[0].node.get_our_node_id());
 498
 499         if steps & 0x0f == 5 { return; }
 500         nodes[0].node.handle_funding_signed(&nodes[1].node.get_our_node_id(), &funding_signed);
 501         {
 502                 let mut added_monitors = nodes[0].chain_monitor.added_monitors.lock().unwrap();
 503                 assert_eq!(added_monitors.len(), 1);
 504                 assert_eq!(added_monitors[0].0, funding_output);
 505                 added_monitors.clear();
 506         }
 507
 508         let events_4 = nodes[0].node.get_and_clear_pending_events();
 509         assert_eq!(events_4.len(), 0);
 510
 511         if steps & 0x0f == 6 { return; }
 512         create_chan_between_nodes_with_value_confirm_first(&nodes[0], &nodes[1], &tx, 2);
 513
 514         if steps & 0x0f == 7 { return; }
 515         confirm_transaction_at(&nodes[0], &tx, 2);
 516         connect_blocks(&nodes[0], CHAN_CONFIRM_DEPTH);
 517         create_chan_between_nodes_with_value_confirm_second(&nodes[1], &nodes[0]);
 518 }
 519
 520 #[test]
 521 fn test_sanity_on_in_flight_opens() {
 522         do_test_sanity_on_in_flight_opens(0);
 523         do_test_sanity_on_in_flight_opens(0 | 0b1000_0000);
 524         do_test_sanity_on_in_flight_opens(1);
 525         do_test_sanity_on_in_flight_opens(1 | 0b1000_0000);
 526         do_test_sanity_on_in_flight_opens(2);
 527         do_test_sanity_on_in_flight_opens(2 | 0b1000_0000);
 528         do_test_sanity_on_in_flight_opens(3);
 529         do_test_sanity_on_in_flight_opens(3 | 0b1000_0000);
 530         do_test_sanity_on_in_flight_opens(4);
 531         do_test_sanity_on_in_flight_opens(4 | 0b1000_0000);
 532         do_test_sanity_on_in_flight_opens(5);
 533         do_test_sanity_on_in_flight_opens(5 | 0b1000_0000);
 534         do_test_sanity_on_in_flight_opens(6);
 535         do_test_sanity_on_in_flight_opens(6 | 0b1000_0000);
 536         do_test_sanity_on_in_flight_opens(7);
 537         do_test_sanity_on_in_flight_opens(7 | 0b1000_0000);
 538         do_test_sanity_on_in_flight_opens(8);
 539         do_test_sanity_on_in_flight_opens(8 | 0b1000_0000);
 540 }
 541
 542 #[test]
 543 fn test_update_fee_vanilla() {
 544         let chanmon_cfgs = create_chanmon_cfgs(2);
 545         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 546         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 547         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 548         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
 549
 550         {
 551                 let mut feerate_lock = chanmon_cfgs[0].fee_estimator.sat_per_kw.lock().unwrap();
 552                 *feerate_lock += 25;
 553         }
 554         nodes[0].node.timer_tick_occurred();
 555         check_added_monitors!(nodes[0], 1);
 556
 557         let events_0 = nodes[0].node.get_and_clear_pending_msg_events();
 558         assert_eq!(events_0.len(), 1);
 559         let (update_msg, commitment_signed) = match events_0[0] {
 560                         MessageSendEvent::UpdateHTLCs { node_id:_, updates: msgs::CommitmentUpdate { update_add_htlcs:_, update_fulfill_htlcs:_, update_fail_htlcs:_, update_fail_malformed_htlcs:_, ref update_fee, ref commitment_signed } } => {
 561                         (update_fee.as_ref(), commitment_signed)
 562                 },
 563                 _ => panic!("Unexpected event"),
 564         };
 565         nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg.unwrap());
 566
 567         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), commitment_signed);
 568         let (revoke_msg, commitment_signed) = get_revoke_commit_msgs!(nodes[1], nodes[0].node.get_our_node_id());
 569         check_added_monitors!(nodes[1], 1);
 570
 571         nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &revoke_msg);
 572         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
 573         check_added_monitors!(nodes[0], 1);
 574
 575         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &commitment_signed);
 576         let revoke_msg = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
 577         // No commitment_signed so get_event_msg's assert(len == 1) passes
 578         check_added_monitors!(nodes[0], 1);
 579
 580         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &revoke_msg);
 581         assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
 582         check_added_monitors!(nodes[1], 1);
 583 }
 584
 585 #[test]
 586 fn test_update_fee_that_funder_cannot_afford() {
 587         let chanmon_cfgs = create_chanmon_cfgs(2);
 588         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 589         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 590         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 591         let channel_value = 1888;
 592         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, channel_value, 700000, InitFeatures::known(), InitFeatures::known());
 593         let channel_id = chan.2;
 594
 595         let feerate = 260;
 596         {
 597                 let mut feerate_lock = chanmon_cfgs[0].fee_estimator.sat_per_kw.lock().unwrap();
 598                 *feerate_lock = feerate;
 599         }
 600         nodes[0].node.timer_tick_occurred();
 601         check_added_monitors!(nodes[0], 1);
 602         let update_msg = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
 603
 604         nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), &update_msg.update_fee.unwrap());
 605
 606         commitment_signed_dance!(nodes[1], nodes[0], update_msg.commitment_signed, false);
 607
 608         //Confirm that the new fee based on the last local commitment txn is what we expected based on the feerate of 260 set above.
 609         //This value results in a fee that is exactly what the funder can afford (277 sat + 1000 sat channel reserve)
 610         {
 611                 let commitment_tx = get_local_commitment_txn!(nodes[1], channel_id)[0].clone();
 612
 613                 //We made sure neither party's funds are below the dust limit so -2 non-HTLC txns from number of outputs
 614                 let num_htlcs = commitment_tx.output.len() - 2;
 615                 let total_fee: u64 = feerate as u64 * (COMMITMENT_TX_BASE_WEIGHT + (num_htlcs as u64) * COMMITMENT_TX_WEIGHT_PER_HTLC) / 1000;
 616                 let mut actual_fee = commitment_tx.output.iter().fold(0, |acc, output| acc + output.value);
 617                 actual_fee = channel_value - actual_fee;
 618                 assert_eq!(total_fee, actual_fee);
 619         }
 620
 621         //Add 2 to the previous fee rate to the final fee increases by 1 (with no HTLCs the fee is essentially
 622         //fee_rate*(724/1000) so the increment of 1*0.724 is rounded back down)
 623         {
 624                 let mut feerate_lock = chanmon_cfgs[0].fee_estimator.sat_per_kw.lock().unwrap();
 625                 *feerate_lock = feerate + 2;
 626         }
 627         nodes[0].node.timer_tick_occurred();
 628         check_added_monitors!(nodes[0], 1);
 629
 630         let update2_msg = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
 631
 632         nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), &update2_msg.update_fee.unwrap());
 633
 634         //While producing the commitment_signed response after handling a received update_fee request the
 635         //check to see if the funder, who sent the update_fee request, can afford the new fee (funder_balance >= fee+channel_reserve)
 636         //Should produce and error.
 637         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &update2_msg.commitment_signed);
 638         nodes[1].logger.assert_log("lightning::ln::channelmanager".to_string(), "Funding remote cannot afford proposed new fee".to_string(), 1);
 639         check_added_monitors!(nodes[1], 1);
 640         check_closed_broadcast!(nodes[1], true);
 641         check_closed_event!(nodes[1], 1, ClosureReason::ProcessingError { err: String::from("Funding remote cannot afford proposed new fee") });
 642 }
 643
 644 #[test]
 645 fn test_update_fee_with_fundee_update_add_htlc() {
 646         let chanmon_cfgs = create_chanmon_cfgs(2);
 647         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 648         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 649         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 650         let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
 651         let logger = test_utils::TestLogger::new();
 652
 653         // balancing
 654         send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
 655
 656         {
 657                 let mut feerate_lock = chanmon_cfgs[0].fee_estimator.sat_per_kw.lock().unwrap();
 658                 *feerate_lock += 20;
 659         }
 660         nodes[0].node.timer_tick_occurred();
 661         check_added_monitors!(nodes[0], 1);
 662
 663         let events_0 = nodes[0].node.get_and_clear_pending_msg_events();
 664         assert_eq!(events_0.len(), 1);
 665         let (update_msg, commitment_signed) = match events_0[0] {
 666                         MessageSendEvent::UpdateHTLCs { node_id:_, updates: msgs::CommitmentUpdate { update_add_htlcs:_, update_fulfill_htlcs:_, update_fail_htlcs:_, update_fail_malformed_htlcs:_, ref update_fee, ref commitment_signed } } => {
 667                         (update_fee.as_ref(), commitment_signed)
 668                 },
 669                 _ => panic!("Unexpected event"),
 670         };
 671         nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg.unwrap());
 672         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), commitment_signed);
 673         let (revoke_msg, commitment_signed) = get_revoke_commit_msgs!(nodes[1], nodes[0].node.get_our_node_id());
 674         check_added_monitors!(nodes[1], 1);
 675
 676         let (our_payment_preimage, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[0]);
 677         let net_graph_msg_handler = &nodes[1].net_graph_msg_handler;
 678         let route = get_route(&nodes[1].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[0].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 800000, TEST_FINAL_CLTV, &logger).unwrap();
 679
 680         // nothing happens since node[1] is in AwaitingRemoteRevoke
 681         nodes[1].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
 682         {
 683                 let mut added_monitors = nodes[0].chain_monitor.added_monitors.lock().unwrap();
 684                 assert_eq!(added_monitors.len(), 0);
 685                 added_monitors.clear();
 686         }
 687         assert!(nodes[0].node.get_and_clear_pending_events().is_empty());
 688         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
 689         // node[1] has nothing to do
 690
 691         nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &revoke_msg);
 692         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
 693         check_added_monitors!(nodes[0], 1);
 694
 695         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &commitment_signed);
 696         let revoke_msg = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
 697         // No commitment_signed so get_event_msg's assert(len == 1) passes
 698         check_added_monitors!(nodes[0], 1);
 699         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &revoke_msg);
 700         check_added_monitors!(nodes[1], 1);
 701         // AwaitingRemoteRevoke ends here
 702
 703         let commitment_update = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
 704         assert_eq!(commitment_update.update_add_htlcs.len(), 1);
 705         assert_eq!(commitment_update.update_fulfill_htlcs.len(), 0);
 706         assert_eq!(commitment_update.update_fail_htlcs.len(), 0);
 707         assert_eq!(commitment_update.update_fail_malformed_htlcs.len(), 0);
 708         assert_eq!(commitment_update.update_fee.is_none(), true);
 709
 710         nodes[0].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &commitment_update.update_add_htlcs[0]);
 711         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &commitment_update.commitment_signed);
 712         check_added_monitors!(nodes[0], 1);
 713         let (revoke, commitment_signed) = get_revoke_commit_msgs!(nodes[0], nodes[1].node.get_our_node_id());
 714
 715         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &revoke);
 716         check_added_monitors!(nodes[1], 1);
 717         assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
 718
 719         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &commitment_signed);
 720         check_added_monitors!(nodes[1], 1);
 721         let revoke = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
 722         // No commitment_signed so get_event_msg's assert(len == 1) passes
 723
 724         nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &revoke);
 725         check_added_monitors!(nodes[0], 1);
 726         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
 727
 728         expect_pending_htlcs_forwardable!(nodes[0]);
 729
 730         let events = nodes[0].node.get_and_clear_pending_events();
 731         assert_eq!(events.len(), 1);
 732         match events[0] {
 733                 Event::PaymentReceived { .. } => { },
 734                 _ => panic!("Unexpected event"),
 735         };
 736
 737         claim_payment(&nodes[1], &vec!(&nodes[0])[..], our_payment_preimage);
 738
 739         send_payment(&nodes[1], &vec!(&nodes[0])[..], 800000);
 740         send_payment(&nodes[0], &vec!(&nodes[1])[..], 800000);
 741         close_channel(&nodes[0], &nodes[1], &chan.2, chan.3, true);
 742         check_closed_event!(nodes[0], 1, ClosureReason::CooperativeClosure);
 743         check_closed_event!(nodes[1], 1, ClosureReason::CooperativeClosure);
 744 }
 745
 746 #[test]
 747 fn test_update_fee() {
 748         let chanmon_cfgs = create_chanmon_cfgs(2);
 749         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 750         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 751         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 752         let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
 753         let channel_id = chan.2;
 754
 755         // A                                        B
 756         // (1) update_fee/commitment_signed      ->
 757         //                                       <- (2) revoke_and_ack
 758         //                                       .- send (3) commitment_signed
 759         // (4) update_fee/commitment_signed      ->
 760         //                                       .- send (5) revoke_and_ack (no CS as we're awaiting a revoke)
 761         //                                       <- (3) commitment_signed delivered
 762         // send (6) revoke_and_ack               -.
 763         //                                       <- (5) deliver revoke_and_ack
 764         // (6) deliver revoke_and_ack            ->
 765         //                                       .- send (7) commitment_signed in response to (4)
 766         //                                       <- (7) deliver commitment_signed
 767         // revoke_and_ack                        ->
 768
 769         // Create and deliver (1)...
 770         let feerate;
 771         {
 772                 let mut feerate_lock = chanmon_cfgs[0].fee_estimator.sat_per_kw.lock().unwrap();
 773                 feerate = *feerate_lock;
 774                 *feerate_lock = feerate + 20;
 775         }
 776         nodes[0].node.timer_tick_occurred();
 777         check_added_monitors!(nodes[0], 1);
 778
 779         let events_0 = nodes[0].node.get_and_clear_pending_msg_events();
 780         assert_eq!(events_0.len(), 1);
 781         let (update_msg, commitment_signed) = match events_0[0] {
 782                         MessageSendEvent::UpdateHTLCs { node_id:_, updates: msgs::CommitmentUpdate { update_add_htlcs:_, update_fulfill_htlcs:_, update_fail_htlcs:_, update_fail_malformed_htlcs:_, ref update_fee, ref commitment_signed } } => {
 783                         (update_fee.as_ref(), commitment_signed)
 784                 },
 785                 _ => panic!("Unexpected event"),
 786         };
 787         nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg.unwrap());
 788
 789         // Generate (2) and (3):
 790         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), commitment_signed);
 791         let (revoke_msg, commitment_signed_0) = get_revoke_commit_msgs!(nodes[1], nodes[0].node.get_our_node_id());
 792         check_added_monitors!(nodes[1], 1);
 793
 794         // Deliver (2):
 795         nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &revoke_msg);
 796         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
 797         check_added_monitors!(nodes[0], 1);
 798
 799         // Create and deliver (4)...
 800         {
 801                 let mut feerate_lock = chanmon_cfgs[0].fee_estimator.sat_per_kw.lock().unwrap();
 802                 *feerate_lock = feerate + 30;
 803         }
 804         nodes[0].node.timer_tick_occurred();
 805         check_added_monitors!(nodes[0], 1);
 806         let events_0 = nodes[0].node.get_and_clear_pending_msg_events();
 807         assert_eq!(events_0.len(), 1);
 808         let (update_msg, commitment_signed) = match events_0[0] {
 809                         MessageSendEvent::UpdateHTLCs { node_id:_, updates: msgs::CommitmentUpdate { update_add_htlcs:_, update_fulfill_htlcs:_, update_fail_htlcs:_, update_fail_malformed_htlcs:_, ref update_fee, ref commitment_signed } } => {
 810                         (update_fee.as_ref(), commitment_signed)
 811                 },
 812                 _ => panic!("Unexpected event"),
 813         };
 814
 815         nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg.unwrap());
 816         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), commitment_signed);
 817         check_added_monitors!(nodes[1], 1);
 818         // ... creating (5)
 819         let revoke_msg = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
 820         // No commitment_signed so get_event_msg's assert(len == 1) passes
 821
 822         // Handle (3), creating (6):
 823         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &commitment_signed_0);
 824         check_added_monitors!(nodes[0], 1);
 825         let revoke_msg_0 = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
 826         // No commitment_signed so get_event_msg's assert(len == 1) passes
 827
 828         // Deliver (5):
 829         nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &revoke_msg);
 830         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
 831         check_added_monitors!(nodes[0], 1);
 832
 833         // Deliver (6), creating (7):
 834         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &revoke_msg_0);
 835         let commitment_update = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
 836         assert!(commitment_update.update_add_htlcs.is_empty());
 837         assert!(commitment_update.update_fulfill_htlcs.is_empty());
 838         assert!(commitment_update.update_fail_htlcs.is_empty());
 839         assert!(commitment_update.update_fail_malformed_htlcs.is_empty());
 840         assert!(commitment_update.update_fee.is_none());
 841         check_added_monitors!(nodes[1], 1);
 842
 843         // Deliver (7)
 844         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &commitment_update.commitment_signed);
 845         check_added_monitors!(nodes[0], 1);
 846         let revoke_msg = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
 847         // No commitment_signed so get_event_msg's assert(len == 1) passes
 848
 849         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &revoke_msg);
 850         check_added_monitors!(nodes[1], 1);
 851         assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
 852
 853         assert_eq!(get_feerate!(nodes[0], channel_id), feerate + 30);
 854         assert_eq!(get_feerate!(nodes[1], channel_id), feerate + 30);
 855         close_channel(&nodes[0], &nodes[1], &chan.2, chan.3, true);
 856         check_closed_event!(nodes[0], 1, ClosureReason::CooperativeClosure);
 857         check_closed_event!(nodes[1], 1, ClosureReason::CooperativeClosure);
 858 }
 859
 860 #[test]
 861 fn fake_network_test() {
 862         // Simple test which builds a network of ChannelManagers, connects them to each other, and
 863         // tests that payments get routed and transactions broadcast in semi-reasonable ways.
 864         let chanmon_cfgs = create_chanmon_cfgs(4);
 865         let node_cfgs = create_node_cfgs(4, &chanmon_cfgs);
 866         let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs, &[None, None, None, None]);
 867         let nodes = create_network(4, &node_cfgs, &node_chanmgrs);
 868
 869         // Create some initial channels
 870         let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
 871         let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2, InitFeatures::known(), InitFeatures::known());
 872         let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3, InitFeatures::known(), InitFeatures::known());
 873
 874         // Rebalance the network a bit by relaying one payment through all the channels...
 875         send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
 876         send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
 877         send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
 878         send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
 879
 880         // Send some more payments
 881         send_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 1000000);
 882         send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1], &nodes[0])[..], 1000000);
 883         send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1])[..], 1000000);
 884
 885         // Test failure packets
 886         let payment_hash_1 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 1000000).1;
 887         fail_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], payment_hash_1);
 888
 889         // Add a new channel that skips 3
 890         let chan_4 = create_announced_chan_between_nodes(&nodes, 1, 3, InitFeatures::known(), InitFeatures::known());
 891
 892         send_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 1000000);
 893         send_payment(&nodes[2], &vec!(&nodes[3])[..], 1000000);
 894         send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
 895         send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
 896         send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
 897         send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
 898         send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
 899
 900         // Do some rebalance loop payments, simultaneously
 901         let mut hops = Vec::with_capacity(3);
 902         hops.push(RouteHop {
 903                 pubkey: nodes[2].node.get_our_node_id(),
 904                 node_features: NodeFeatures::empty(),
 905                 short_channel_id: chan_2.0.contents.short_channel_id,
 906                 channel_features: ChannelFeatures::empty(),
 907                 fee_msat: 0,
 908                 cltv_expiry_delta: chan_3.0.contents.cltv_expiry_delta as u32
 909         });
 910         hops.push(RouteHop {
 911                 pubkey: nodes[3].node.get_our_node_id(),
 912                 node_features: NodeFeatures::empty(),
 913                 short_channel_id: chan_3.0.contents.short_channel_id,
 914                 channel_features: ChannelFeatures::empty(),
 915                 fee_msat: 0,
 916                 cltv_expiry_delta: chan_4.1.contents.cltv_expiry_delta as u32
 917         });
 918         hops.push(RouteHop {
 919                 pubkey: nodes[1].node.get_our_node_id(),
 920                 node_features: NodeFeatures::known(),
 921                 short_channel_id: chan_4.0.contents.short_channel_id,
 922                 channel_features: ChannelFeatures::known(),
 923                 fee_msat: 1000000,
 924                 cltv_expiry_delta: TEST_FINAL_CLTV,
 925         });
 926         hops[1].fee_msat = chan_4.1.contents.fee_base_msat as u64 + chan_4.1.contents.fee_proportional_millionths as u64 * hops[2].fee_msat as u64 / 1000000;
 927         hops[0].fee_msat = chan_3.0.contents.fee_base_msat as u64 + chan_3.0.contents.fee_proportional_millionths as u64 * hops[1].fee_msat as u64 / 1000000;
 928         let payment_preimage_1 = send_along_route(&nodes[1], Route { paths: vec![hops] }, &vec!(&nodes[2], &nodes[3], &nodes[1])[..], 1000000).0;
 929
 930         let mut hops = Vec::with_capacity(3);
 931         hops.push(RouteHop {
 932                 pubkey: nodes[3].node.get_our_node_id(),
 933                 node_features: NodeFeatures::empty(),
 934                 short_channel_id: chan_4.0.contents.short_channel_id,
 935                 channel_features: ChannelFeatures::empty(),
 936                 fee_msat: 0,
 937                 cltv_expiry_delta: chan_3.1.contents.cltv_expiry_delta as u32
 938         });
 939         hops.push(RouteHop {
 940                 pubkey: nodes[2].node.get_our_node_id(),
 941                 node_features: NodeFeatures::empty(),
 942                 short_channel_id: chan_3.0.contents.short_channel_id,
 943                 channel_features: ChannelFeatures::empty(),
 944                 fee_msat: 0,
 945                 cltv_expiry_delta: chan_2.1.contents.cltv_expiry_delta as u32
 946         });
 947         hops.push(RouteHop {
 948                 pubkey: nodes[1].node.get_our_node_id(),
 949                 node_features: NodeFeatures::known(),
 950                 short_channel_id: chan_2.0.contents.short_channel_id,
 951                 channel_features: ChannelFeatures::known(),
 952                 fee_msat: 1000000,
 953                 cltv_expiry_delta: TEST_FINAL_CLTV,
 954         });
 955         hops[1].fee_msat = chan_2.1.contents.fee_base_msat as u64 + chan_2.1.contents.fee_proportional_millionths as u64 * hops[2].fee_msat as u64 / 1000000;
 956         hops[0].fee_msat = chan_3.1.contents.fee_base_msat as u64 + chan_3.1.contents.fee_proportional_millionths as u64 * hops[1].fee_msat as u64 / 1000000;
 957         let payment_hash_2 = send_along_route(&nodes[1], Route { paths: vec![hops] }, &vec!(&nodes[3], &nodes[2], &nodes[1])[..], 1000000).1;
 958
 959         // Claim the rebalances...
 960         fail_payment(&nodes[1], &vec!(&nodes[3], &nodes[2], &nodes[1])[..], payment_hash_2);
 961         claim_payment(&nodes[1], &vec!(&nodes[2], &nodes[3], &nodes[1])[..], payment_preimage_1);
 962
 963         // Add a duplicate new channel from 2 to 4
 964         let chan_5 = create_announced_chan_between_nodes(&nodes, 1, 3, InitFeatures::known(), InitFeatures::known());
 965
 966         // Send some payments across both channels
 967         let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
 968         let payment_preimage_4 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
 969         let payment_preimage_5 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
 970
 971
 972         route_over_limit(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000);
 973         let events = nodes[0].node.get_and_clear_pending_msg_events();
 974         assert_eq!(events.len(), 0);
 975         nodes[0].logger.assert_log_regex("lightning::ln::channelmanager".to_string(), regex::Regex::new(r"Cannot send value that would put us over the max HTLC value in flight our peer will accept \(\d+\)").unwrap(), 1);
 976
 977         //TODO: Test that routes work again here as we've been notified that the channel is full
 978
 979         claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_3);
 980         claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_4);
 981         claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_5);
 982
 983         // Close down the channels...
 984         close_channel(&nodes[0], &nodes[1], &chan_1.2, chan_1.3, true);
 985         check_closed_event!(nodes[0], 1, ClosureReason::CooperativeClosure);
 986         check_closed_event!(nodes[1], 1, ClosureReason::CooperativeClosure);
 987         close_channel(&nodes[1], &nodes[2], &chan_2.2, chan_2.3, false);
 988         check_closed_event!(nodes[1], 1, ClosureReason::CooperativeClosure);
 989         check_closed_event!(nodes[2], 1, ClosureReason::CooperativeClosure);
 990         close_channel(&nodes[2], &nodes[3], &chan_3.2, chan_3.3, true);
 991         check_closed_event!(nodes[2], 1, ClosureReason::CooperativeClosure);
 992         check_closed_event!(nodes[3], 1, ClosureReason::CooperativeClosure);
 993         close_channel(&nodes[1], &nodes[3], &chan_4.2, chan_4.3, false);
 994         check_closed_event!(nodes[1], 1, ClosureReason::CooperativeClosure);
 995         check_closed_event!(nodes[3], 1, ClosureReason::CooperativeClosure);
 996         close_channel(&nodes[1], &nodes[3], &chan_5.2, chan_5.3, false);
 997         check_closed_event!(nodes[1], 1, ClosureReason::CooperativeClosure);
 998         check_closed_event!(nodes[3], 1, ClosureReason::CooperativeClosure);
 999 }
1000
1001 #[test]
1002 fn holding_cell_htlc_counting() {
1003         // Tests that HTLCs in the holding cell count towards the pending HTLC limits on outbound HTLCs
1004         // to ensure we don't end up with HTLCs sitting around in our holding cell for several
1005         // commitment dance rounds.
1006         let chanmon_cfgs = create_chanmon_cfgs(3);
1007         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
1008         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
1009         let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs);
1010         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
1011         let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2, InitFeatures::known(), InitFeatures::known());
1012         let logger = test_utils::TestLogger::new();
1013
1014         let mut payments = Vec::new();
1015         for _ in 0..::ln::channel::OUR_MAX_HTLCS {
1016                 let (payment_preimage, payment_hash, payment_secret) = get_payment_preimage_hash!(nodes[2]);
1017                 let net_graph_msg_handler = &nodes[1].net_graph_msg_handler;
1018                 let route = get_route(&nodes[1].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[2].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 100000, TEST_FINAL_CLTV, &logger).unwrap();
1019                 nodes[1].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap();
1020                 payments.push((payment_preimage, payment_hash));
1021         }
1022         check_added_monitors!(nodes[1], 1);
1023
1024         let mut events = nodes[1].node.get_and_clear_pending_msg_events();
1025         assert_eq!(events.len(), 1);
1026         let initial_payment_event = SendEvent::from_event(events.pop().unwrap());
1027         assert_eq!(initial_payment_event.node_id, nodes[2].node.get_our_node_id());
1028
1029         // There is now one HTLC in an outbound commitment transaction and (OUR_MAX_HTLCS - 1) HTLCs in
1030         // the holding cell waiting on B's RAA to send. At this point we should not be able to add
1031         // another HTLC.
1032         let (_, payment_hash_1, payment_secret_1) = get_payment_preimage_hash!(nodes[2]);
1033         {
1034                 let net_graph_msg_handler = &nodes[1].net_graph_msg_handler;
1035                 let route = get_route(&nodes[1].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[2].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 100000, TEST_FINAL_CLTV, &logger).unwrap();
1036                 unwrap_send_err!(nodes[1].node.send_payment(&route, payment_hash_1, &Some(payment_secret_1)), true, APIError::ChannelUnavailable { ref err },
1037                         assert!(regex::Regex::new(r"Cannot push more than their max accepted HTLCs \(\d+\)").unwrap().is_match(err)));
1038                 assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
1039                 nodes[1].logger.assert_log_contains("lightning::ln::channelmanager".to_string(), "Cannot push more than their max accepted HTLCs".to_string(), 1);
1040         }
1041
1042         // This should also be true if we try to forward a payment.
1043         let (_, payment_hash_2, payment_secret_2) = get_payment_preimage_hash!(nodes[2]);
1044         {
1045                 let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
1046                 let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[2].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 100000, TEST_FINAL_CLTV, &logger).unwrap();
1047                 nodes[0].node.send_payment(&route, payment_hash_2, &Some(payment_secret_2)).unwrap();
1048                 check_added_monitors!(nodes[0], 1);
1049         }
1050
1051         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
1052         assert_eq!(events.len(), 1);
1053         let payment_event = SendEvent::from_event(events.pop().unwrap());
1054         assert_eq!(payment_event.node_id, nodes[1].node.get_our_node_id());
1055
1056         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
1057         commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
1058         // We have to forward pending HTLCs twice - once tries to forward the payment forward (and
1059         // fails), the second will process the resulting failure and fail the HTLC backward.
1060         expect_pending_htlcs_forwardable!(nodes[1]);
1061         expect_pending_htlcs_forwardable!(nodes[1]);
1062         check_added_monitors!(nodes[1], 1);
1063
1064         let bs_fail_updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
1065         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &bs_fail_updates.update_fail_htlcs[0]);
1066         commitment_signed_dance!(nodes[0], nodes[1], bs_fail_updates.commitment_signed, false, true);
1067
1068         expect_payment_failed_with_update!(nodes[0], payment_hash_2, false, chan_2.0.contents.short_channel_id, false);
1069
1070         // Now forward all the pending HTLCs and claim them back
1071         nodes[2].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &initial_payment_event.msgs[0]);
1072         nodes[2].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &initial_payment_event.commitment_msg);
1073         check_added_monitors!(nodes[2], 1);
1074
1075         let (bs_revoke_and_ack, bs_commitment_signed) = get_revoke_commit_msgs!(nodes[2], nodes[1].node.get_our_node_id());
1076         nodes[1].node.handle_revoke_and_ack(&nodes[2].node.get_our_node_id(), &bs_revoke_and_ack);
1077         check_added_monitors!(nodes[1], 1);
1078         let as_updates = get_htlc_update_msgs!(nodes[1], nodes[2].node.get_our_node_id());
1079
1080         nodes[1].node.handle_commitment_signed(&nodes[2].node.get_our_node_id(), &bs_commitment_signed);
1081         check_added_monitors!(nodes[1], 1);
1082         let as_raa = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[2].node.get_our_node_id());
1083
1084         for ref update in as_updates.update_add_htlcs.iter() {
1085                 nodes[2].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), update);
1086         }
1087         nodes[2].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &as_updates.commitment_signed);
1088         check_added_monitors!(nodes[2], 1);
1089         nodes[2].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &as_raa);
1090         check_added_monitors!(nodes[2], 1);
1091         let (bs_revoke_and_ack, bs_commitment_signed) = get_revoke_commit_msgs!(nodes[2], nodes[1].node.get_our_node_id());
1092
1093         nodes[1].node.handle_revoke_and_ack(&nodes[2].node.get_our_node_id(), &bs_revoke_and_ack);
1094         check_added_monitors!(nodes[1], 1);
1095         nodes[1].node.handle_commitment_signed(&nodes[2].node.get_our_node_id(), &bs_commitment_signed);
1096         check_added_monitors!(nodes[1], 1);
1097         let as_final_raa = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[2].node.get_our_node_id());
1098
1099         nodes[2].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &as_final_raa);
1100         check_added_monitors!(nodes[2], 1);
1101
1102         expect_pending_htlcs_forwardable!(nodes[2]);
1103
1104         let events = nodes[2].node.get_and_clear_pending_events();
1105         assert_eq!(events.len(), payments.len());
1106         for (event, &(_, ref hash)) in events.iter().zip(payments.iter()) {
1107                 match event {
1108                         &Event::PaymentReceived { ref payment_hash, .. } => {
1109                                 assert_eq!(*payment_hash, *hash);
1110                         },
1111                         _ => panic!("Unexpected event"),
1112                 };
1113         }
1114
1115         for (preimage, _) in payments.drain(..) {
1116                 claim_payment(&nodes[1], &[&nodes[2]], preimage);
1117         }
1118
1119         send_payment(&nodes[0], &[&nodes[1], &nodes[2]], 1000000);
1120 }
1121
1122 #[test]
1123 fn duplicate_htlc_test() {
1124         // Test that we accept duplicate payment_hash HTLCs across the network and that
1125         // claiming/failing them are all separate and don't affect each other
1126         let chanmon_cfgs = create_chanmon_cfgs(6);
1127         let node_cfgs = create_node_cfgs(6, &chanmon_cfgs);
1128         let node_chanmgrs = create_node_chanmgrs(6, &node_cfgs, &[None, None, None, None, None, None]);
1129         let mut nodes = create_network(6, &node_cfgs, &node_chanmgrs);
1130
1131         // Create some initial channels to route via 3 to 4/5 from 0/1/2
1132         create_announced_chan_between_nodes(&nodes, 0, 3, InitFeatures::known(), InitFeatures::known());
1133         create_announced_chan_between_nodes(&nodes, 1, 3, InitFeatures::known(), InitFeatures::known());
1134         create_announced_chan_between_nodes(&nodes, 2, 3, InitFeatures::known(), InitFeatures::known());
1135         create_announced_chan_between_nodes(&nodes, 3, 4, InitFeatures::known(), InitFeatures::known());
1136         create_announced_chan_between_nodes(&nodes, 3, 5, InitFeatures::known(), InitFeatures::known());
1137
1138         let (payment_preimage, payment_hash, _) = route_payment(&nodes[0], &vec!(&nodes[3], &nodes[4])[..], 1000000);
1139
1140         *nodes[0].network_payment_count.borrow_mut() -= 1;
1141         assert_eq!(route_payment(&nodes[1], &vec!(&nodes[3])[..], 1000000).0, payment_preimage);
1142
1143         *nodes[0].network_payment_count.borrow_mut() -= 1;
1144         assert_eq!(route_payment(&nodes[2], &vec!(&nodes[3], &nodes[5])[..], 1000000).0, payment_preimage);
1145
1146         claim_payment(&nodes[0], &vec!(&nodes[3], &nodes[4])[..], payment_preimage);
1147         fail_payment(&nodes[2], &vec!(&nodes[3], &nodes[5])[..], payment_hash);
1148         claim_payment(&nodes[1], &vec!(&nodes[3])[..], payment_preimage);
1149 }
1150
1151 #[test]
1152 fn test_duplicate_htlc_different_direction_onchain() {
1153         // Test that ChannelMonitor doesn't generate 2 preimage txn
1154         // when we have 2 HTLCs with same preimage that go across a node
1155         // in opposite directions, even with the same payment secret.
1156         let chanmon_cfgs = create_chanmon_cfgs(2);
1157         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
1158         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
1159         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
1160
1161         let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
1162         let logger = test_utils::TestLogger::new();
1163
1164         // balancing
1165         send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
1166
1167         let (payment_preimage, payment_hash, _) = route_payment(&nodes[0], &vec!(&nodes[1])[..], 900_000);
1168
1169         let net_graph_msg_handler = &nodes[1].net_graph_msg_handler;
1170         let route = get_route(&nodes[1].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[0].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 800_000, TEST_FINAL_CLTV, &logger).unwrap();
1171         let node_a_payment_secret = nodes[0].node.create_inbound_payment_for_hash(payment_hash, None, 7200, 0).unwrap();
1172         send_along_route_with_secret(&nodes[1], route, &[&[&nodes[0]]], 800_000, payment_hash, node_a_payment_secret);
1173
1174         // Provide preimage to node 0 by claiming payment
1175         nodes[0].node.claim_funds(payment_preimage);
1176         check_added_monitors!(nodes[0], 1);
1177
1178         // Broadcast node 1 commitment txn
1179         let remote_txn = get_local_commitment_txn!(nodes[1], chan_1.2);
1180
1181         assert_eq!(remote_txn[0].output.len(), 4); // 1 local, 1 remote, 1 htlc inbound, 1 htlc outbound
1182         let mut has_both_htlcs = 0; // check htlcs match ones committed
1183         for outp in remote_txn[0].output.iter() {
1184                 if outp.value == 800_000 / 1000 {
1185                         has_both_htlcs += 1;
1186                 } else if outp.value == 900_000 / 1000 {
1187                         has_both_htlcs += 1;
1188                 }
1189         }
1190         assert_eq!(has_both_htlcs, 2);
1191
1192         mine_transaction(&nodes[0], &remote_txn[0]);
1193         check_added_monitors!(nodes[0], 1);
1194         check_closed_event!(nodes[0], 1, ClosureReason::CommitmentTxConfirmed);
1195         connect_blocks(&nodes[0], TEST_FINAL_CLTV - 1); // Confirm blocks until the HTLC expires
1196
1197         // Check we only broadcast 1 timeout tx
1198         let claim_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().clone();
1199         assert_eq!(claim_txn.len(), 8);
1200         assert_eq!(claim_txn[1], claim_txn[4]);
1201         assert_eq!(claim_txn[2], claim_txn[5]);
1202         check_spends!(claim_txn[1], chan_1.3);
1203         check_spends!(claim_txn[2], claim_txn[1]);
1204         check_spends!(claim_txn[7], claim_txn[1]);
1205
1206         assert_eq!(claim_txn[0].input.len(), 1);
1207         assert_eq!(claim_txn[3].input.len(), 1);
1208         assert_eq!(claim_txn[0].input[0].previous_output, claim_txn[3].input[0].previous_output);
1209
1210         assert_eq!(claim_txn[0].input.len(), 1);
1211         assert_eq!(claim_txn[0].input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT); // HTLC 1 <--> 0, preimage tx
1212         check_spends!(claim_txn[0], remote_txn[0]);
1213         assert_eq!(remote_txn[0].output[claim_txn[0].input[0].previous_output.vout as usize].value, 800);
1214         assert_eq!(claim_txn[6].input.len(), 1);
1215         assert_eq!(claim_txn[6].input[0].witness.last().unwrap().len(), ACCEPTED_HTLC_SCRIPT_WEIGHT); // HTLC 0 <--> 1, timeout tx
1216         check_spends!(claim_txn[6], remote_txn[0]);
1217         assert_eq!(remote_txn[0].output[claim_txn[6].input[0].previous_output.vout as usize].value, 900);
1218
1219         let events = nodes[0].node.get_and_clear_pending_msg_events();
1220         assert_eq!(events.len(), 3);
1221         for e in events {
1222                 match e {
1223                         MessageSendEvent::BroadcastChannelUpdate { .. } => {},
1224                         MessageSendEvent::HandleError { node_id, action: msgs::ErrorAction::SendErrorMessage { ref msg } } => {
1225                                 assert_eq!(node_id, nodes[1].node.get_our_node_id());
1226                                 assert_eq!(msg.data, "Commitment or closing transaction was confirmed on chain.");
1227                         },
1228                         MessageSendEvent::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, .. } } => {
1229                                 assert!(update_add_htlcs.is_empty());
1230                                 assert!(update_fail_htlcs.is_empty());
1231                                 assert_eq!(update_fulfill_htlcs.len(), 1);
1232                                 assert!(update_fail_malformed_htlcs.is_empty());
1233                                 assert_eq!(nodes[1].node.get_our_node_id(), *node_id);
1234                         },
1235                         _ => panic!("Unexpected event"),
1236                 }
1237         }
1238 }
1239
1240 #[test]
1241 fn test_basic_channel_reserve() {
1242         let chanmon_cfgs = create_chanmon_cfgs(2);
1243         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
1244         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
1245         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
1246         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 95000000, InitFeatures::known(), InitFeatures::known());
1247         let logger = test_utils::TestLogger::new();
1248
1249         let chan_stat = get_channel_value_stat!(nodes[0], chan.2);
1250         let channel_reserve = chan_stat.channel_reserve_msat;
1251
1252         // The 2* and +1 are for the fee spike reserve.
1253         let (_, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[1]);
1254         let commit_tx_fee = 2 * commit_tx_fee_msat(get_feerate!(nodes[0], chan.2), 1 + 1);
1255         let max_can_send = 5000000 - channel_reserve - commit_tx_fee;
1256         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
1257         let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes.last().unwrap().node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), max_can_send + 1, TEST_FINAL_CLTV, &logger).unwrap();
1258         let err = nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).err().unwrap();
1259         match err {
1260                 PaymentSendFailure::AllFailedRetrySafe(ref fails) => {
1261                         match &fails[0] {
1262                                 &APIError::ChannelUnavailable{ref err} =>
1263                                         assert!(regex::Regex::new(r"Cannot send value that would put our balance under counterparty-announced channel reserve value \(\d+\)").unwrap().is_match(err)),
1264                                 _ => panic!("Unexpected error variant"),
1265                         }
1266                 },
1267                 _ => panic!("Unexpected error variant"),
1268         }
1269         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
1270         nodes[0].logger.assert_log_contains("lightning::ln::channelmanager".to_string(), "Cannot send value that would put our balance under counterparty-announced channel reserve value".to_string(), 1);
1271
1272         send_payment(&nodes[0], &vec![&nodes[1]], max_can_send);
1273 }
1274
1275 #[test]
1276 fn test_fee_spike_violation_fails_htlc() {
1277         let chanmon_cfgs = create_chanmon_cfgs(2);
1278         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
1279         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
1280         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
1281         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 95000000, InitFeatures::known(), InitFeatures::known());
1282
1283         let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], 3460001);
1284         // Need to manually create the update_add_htlc message to go around the channel reserve check in send_htlc()
1285         let secp_ctx = Secp256k1::new();
1286         let session_priv = SecretKey::from_slice(&[42; 32]).expect("RNG is bad!");
1287
1288         let cur_height = nodes[1].node.best_block.read().unwrap().height() + 1;
1289
1290         let onion_keys = onion_utils::construct_onion_keys(&secp_ctx, &route.paths[0], &session_priv).unwrap();
1291         let (onion_payloads, htlc_msat, htlc_cltv) = onion_utils::build_onion_payloads(&route.paths[0], 3460001, &Some(payment_secret), cur_height, &None).unwrap();
1292         let onion_packet = onion_utils::construct_onion_packet(onion_payloads, onion_keys, [0; 32], &payment_hash);
1293         let msg = msgs::UpdateAddHTLC {
1294                 channel_id: chan.2,
1295                 htlc_id: 0,
1296                 amount_msat: htlc_msat,
1297                 payment_hash: payment_hash,
1298                 cltv_expiry: htlc_cltv,
1299                 onion_routing_packet: onion_packet,
1300         };
1301
1302         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &msg);
1303
1304         // Now manually create the commitment_signed message corresponding to the update_add
1305         // nodes[0] just sent. In the code for construction of this message, "local" refers
1306         // to the sender of the message, and "remote" refers to the receiver.
1307
1308         let feerate_per_kw = get_feerate!(nodes[0], chan.2);
1309
1310         const INITIAL_COMMITMENT_NUMBER: u64 = (1 << 48) - 1;
1311
1312         // Get the EnforcingSigner for each channel, which will be used to (1) get the keys
1313         // needed to sign the new commitment tx and (2) sign the new commitment tx.
1314         let (local_revocation_basepoint, local_htlc_basepoint, local_secret, next_local_point, local_funding) = {
1315                 let chan_lock = nodes[0].node.channel_state.lock().unwrap();
1316                 let local_chan = chan_lock.by_id.get(&chan.2).unwrap();
1317                 let chan_signer = local_chan.get_signer();
1318                 // Make the signer believe we validated another commitment, so we can release the secret
1319                 chan_signer.get_enforcement_state().last_holder_commitment -= 1;
1320
1321                 let pubkeys = chan_signer.pubkeys();
1322                 (pubkeys.revocation_basepoint, pubkeys.htlc_basepoint,
1323                  chan_signer.release_commitment_secret(INITIAL_COMMITMENT_NUMBER),
1324                  chan_signer.get_per_commitment_point(INITIAL_COMMITMENT_NUMBER - 2, &secp_ctx),
1325                  chan_signer.pubkeys().funding_pubkey)
1326         };
1327         let (remote_delayed_payment_basepoint, remote_htlc_basepoint, remote_point, remote_funding) = {
1328                 let chan_lock = nodes[1].node.channel_state.lock().unwrap();
1329                 let remote_chan = chan_lock.by_id.get(&chan.2).unwrap();
1330                 let chan_signer = remote_chan.get_signer();
1331                 let pubkeys = chan_signer.pubkeys();
1332                 (pubkeys.delayed_payment_basepoint, pubkeys.htlc_basepoint,
1333                  chan_signer.get_per_commitment_point(INITIAL_COMMITMENT_NUMBER - 1, &secp_ctx),
1334                  chan_signer.pubkeys().funding_pubkey)
1335         };
1336
1337         // Assemble the set of keys we can use for signatures for our commitment_signed message.
1338         let commit_tx_keys = chan_utils::TxCreationKeys::derive_new(&secp_ctx, &remote_point, &remote_delayed_payment_basepoint,
1339                 &remote_htlc_basepoint, &local_revocation_basepoint, &local_htlc_basepoint).unwrap();
1340
1341         // Build the remote commitment transaction so we can sign it, and then later use the
1342         // signature for the commitment_signed message.
1343         let local_chan_balance = 1313;
1344
1345         let accepted_htlc_info = chan_utils::HTLCOutputInCommitment {
1346                 offered: false,
1347                 amount_msat: 3460001,
1348                 cltv_expiry: htlc_cltv,
1349                 payment_hash,
1350                 transaction_output_index: Some(1),
1351         };
1352
1353         let commitment_number = INITIAL_COMMITMENT_NUMBER - 1;
1354
1355         let res = {
1356                 let local_chan_lock = nodes[0].node.channel_state.lock().unwrap();
1357                 let local_chan = local_chan_lock.by_id.get(&chan.2).unwrap();
1358                 let local_chan_signer = local_chan.get_signer();
1359                 let commitment_tx = CommitmentTransaction::new_with_auxiliary_htlc_data(
1360                         commitment_number,
1361                         95000,
1362                         local_chan_balance,
1363                         false, local_funding, remote_funding,
1364                         commit_tx_keys.clone(),
1365                         feerate_per_kw,
1366                         &mut vec![(accepted_htlc_info, ())],
1367                         &local_chan.channel_transaction_parameters.as_counterparty_broadcastable()
1368                 );
1369                 local_chan_signer.sign_counterparty_commitment(&commitment_tx, &secp_ctx).unwrap()
1370         };
1371
1372         let commit_signed_msg = msgs::CommitmentSigned {
1373                 channel_id: chan.2,
1374                 signature: res.0,
1375                 htlc_signatures: res.1
1376         };
1377
1378         // Send the commitment_signed message to the nodes[1].
1379         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &commit_signed_msg);
1380         let _ = nodes[1].node.get_and_clear_pending_msg_events();
1381
1382         // Send the RAA to nodes[1].
1383         let raa_msg = msgs::RevokeAndACK {
1384                 channel_id: chan.2,
1385                 per_commitment_secret: local_secret,
1386                 next_per_commitment_point: next_local_point
1387         };
1388         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &raa_msg);
1389
1390         let events = nodes[1].node.get_and_clear_pending_msg_events();
1391         assert_eq!(events.len(), 1);
1392         // Make sure the HTLC failed in the way we expect.
1393         match events[0] {
1394                 MessageSendEvent::UpdateHTLCs { updates: msgs::CommitmentUpdate { ref update_fail_htlcs, .. }, .. } => {
1395                         assert_eq!(update_fail_htlcs.len(), 1);
1396                         update_fail_htlcs[0].clone()
1397                 },
1398                 _ => panic!("Unexpected event"),
1399         };
1400         nodes[1].logger.assert_log("lightning::ln::channel".to_string(),
1401                 format!("Attempting to fail HTLC due to fee spike buffer violation in channel {}. Rebalancing is required.", ::hex::encode(raa_msg.channel_id)), 1);
1402
1403         check_added_monitors!(nodes[1], 2);
1404 }
1405
1406 #[test]
1407 fn test_chan_reserve_violation_outbound_htlc_inbound_chan() {
1408         let mut chanmon_cfgs = create_chanmon_cfgs(2);
1409         // Set the fee rate for the channel very high, to the point where the fundee
1410         // sending any above-dust amount would result in a channel reserve violation.
1411         // In this test we check that we would be prevented from sending an HTLC in
1412         // this situation.
1413         let feerate_per_kw = 253;
1414         chanmon_cfgs[0].fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(feerate_per_kw) };
1415         chanmon_cfgs[1].fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(feerate_per_kw) };
1416         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
1417         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
1418         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
1419
1420         let mut push_amt = 100_000_000;
1421         push_amt -= feerate_per_kw as u64 * (COMMITMENT_TX_BASE_WEIGHT + COMMITMENT_TX_WEIGHT_PER_HTLC) / 1000 * 1000;
1422         push_amt -= Channel::<EnforcingSigner>::get_holder_selected_channel_reserve_satoshis(100_000) * 1000;
1423
1424         let _ = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100_000, push_amt, InitFeatures::known(), InitFeatures::known());
1425
1426         // Sending exactly enough to hit the reserve amount should be accepted
1427         let (_, _, _) = route_payment(&nodes[1], &[&nodes[0]], 1_000_000);
1428
1429         // However one more HTLC should be significantly over the reserve amount and fail.
1430         let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[1], nodes[0], 1_000_000);
1431         unwrap_send_err!(nodes[1].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)), true, APIError::ChannelUnavailable { ref err },
1432                 assert_eq!(err, "Cannot send value that would put counterparty balance under holder-announced channel reserve value"));
1433         assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
1434         nodes[1].logger.assert_log("lightning::ln::channelmanager".to_string(), "Cannot send value that would put counterparty balance under holder-announced channel reserve value".to_string(), 1);
1435 }
1436
1437 #[test]
1438 fn test_chan_reserve_violation_inbound_htlc_outbound_channel() {
1439         let mut chanmon_cfgs = create_chanmon_cfgs(2);
1440         // Set the fee rate for the channel very high, to the point where the funder
1441         // receiving 1 update_add_htlc would result in them closing the channel due
1442         // to channel reserve violation. This close could also happen if the fee went
1443         // up a more realistic amount, but many HTLCs were outstanding at the time of
1444         // the update_add_htlc.
1445         chanmon_cfgs[0].fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(6000) };
1446         chanmon_cfgs[1].fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(6000) };
1447         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
1448         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
1449         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
1450         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 95000000, InitFeatures::known(), InitFeatures::known());
1451
1452         let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[1], nodes[0], 1000);
1453         // Need to manually create the update_add_htlc message to go around the channel reserve check in send_htlc()
1454         let secp_ctx = Secp256k1::new();
1455         let session_priv = SecretKey::from_slice(&[42; 32]).unwrap();
1456         let cur_height = nodes[1].node.best_block.read().unwrap().height() + 1;
1457         let onion_keys = onion_utils::construct_onion_keys(&secp_ctx, &route.paths[0], &session_priv).unwrap();
1458         let (onion_payloads, htlc_msat, htlc_cltv) = onion_utils::build_onion_payloads(&route.paths[0], 1000, &Some(payment_secret), cur_height, &None).unwrap();
1459         let onion_packet = onion_utils::construct_onion_packet(onion_payloads, onion_keys, [0; 32], &payment_hash);
1460         let msg = msgs::UpdateAddHTLC {
1461                 channel_id: chan.2,
1462                 htlc_id: 1,
1463                 amount_msat: htlc_msat + 1,
1464                 payment_hash: payment_hash,
1465                 cltv_expiry: htlc_cltv,
1466                 onion_routing_packet: onion_packet,
1467         };
1468
1469         nodes[0].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &msg);
1470         // Check that the payment failed and the channel is closed in response to the malicious UpdateAdd.
1471         nodes[0].logger.assert_log("lightning::ln::channelmanager".to_string(), "Cannot accept HTLC that would put our balance under counterparty-announced channel reserve value".to_string(), 1);
1472         assert_eq!(nodes[0].node.list_channels().len(), 0);
1473         let err_msg = check_closed_broadcast!(nodes[0], true).unwrap();
1474         assert_eq!(err_msg.data, "Cannot accept HTLC that would put our balance under counterparty-announced channel reserve value");
1475         check_added_monitors!(nodes[0], 1);
1476         check_closed_event!(nodes[0], 1, ClosureReason::ProcessingError { err: "Cannot accept HTLC that would put our balance under counterparty-announced channel reserve value".to_string() });
1477 }
1478
1479 #[test]
1480 fn test_chan_reserve_dust_inbound_htlcs_outbound_chan() {
1481         // Test that if we receive many dust HTLCs over an outbound channel, they don't count when
1482         // calculating our commitment transaction fee (this was previously broken).
1483         let mut chanmon_cfgs = create_chanmon_cfgs(2);
1484         let feerate_per_kw = 253;
1485         chanmon_cfgs[0].fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(feerate_per_kw) };
1486         chanmon_cfgs[1].fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(feerate_per_kw) };
1487
1488         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
1489         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None, None]);
1490         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
1491
1492         // Set nodes[0]'s balance such that they will consider any above-dust received HTLC to be a
1493         // channel reserve violation (so their balance is channel reserve (1000 sats) + commitment
1494         // transaction fee with 0 HTLCs (183 sats)).
1495         let mut push_amt = 100_000_000;
1496         push_amt -= feerate_per_kw as u64 * (COMMITMENT_TX_BASE_WEIGHT) / 1000 * 1000;
1497         push_amt -= Channel::<EnforcingSigner>::get_holder_selected_channel_reserve_satoshis(100_000) * 1000;
1498         create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, push_amt, InitFeatures::known(), InitFeatures::known());
1499
1500         let dust_amt = crate::ln::channel::MIN_DUST_LIMIT_SATOSHIS * 1000
1501                 + feerate_per_kw as u64 * HTLC_SUCCESS_TX_WEIGHT / 1000 * 1000 - 1;
1502         // In the previous code, routing this dust payment would cause nodes[0] to perceive a channel
1503         // reserve violation even though it's a dust HTLC and therefore shouldn't count towards the
1504         // commitment transaction fee.
1505         let (_, _, _) = route_payment(&nodes[1], &[&nodes[0]], dust_amt);
1506
1507         // One more than the dust amt should fail, however.
1508         let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[1], nodes[0], dust_amt + 1);
1509         unwrap_send_err!(nodes[1].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)), true, APIError::ChannelUnavailable { ref err },
1510                 assert_eq!(err, "Cannot send value that would put counterparty balance under holder-announced channel reserve value"));
1511 }
1512
1513 #[test]
1514 fn test_chan_reserve_dust_inbound_htlcs_inbound_chan() {
1515         // Test that if we receive many dust HTLCs over an inbound channel, they don't count when
1516         // calculating our counterparty's commitment transaction fee (this was previously broken).
1517         let chanmon_cfgs = create_chanmon_cfgs(2);
1518         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
1519         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None, None]);
1520         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
1521         create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 98000000, InitFeatures::known(), InitFeatures::known());
1522
1523         let payment_amt = 46000; // Dust amount
1524         // In the previous code, these first four payments would succeed.
1525         let (_, _, _) = route_payment(&nodes[0], &[&nodes[1]], payment_amt);
1526         let (_, _, _) = route_payment(&nodes[0], &[&nodes[1]], payment_amt);
1527         let (_, _, _) = route_payment(&nodes[0], &[&nodes[1]], payment_amt);
1528         let (_, _, _) = route_payment(&nodes[0], &[&nodes[1]], payment_amt);
1529
1530         // Then these next 5 would be interpreted by nodes[1] as violating the fee spike buffer.
1531         let (_, _, _) = route_payment(&nodes[0], &[&nodes[1]], payment_amt);
1532         let (_, _, _) = route_payment(&nodes[0], &[&nodes[1]], payment_amt);
1533         let (_, _, _) = route_payment(&nodes[0], &[&nodes[1]], payment_amt);
1534         let (_, _, _) = route_payment(&nodes[0], &[&nodes[1]], payment_amt);
1535         let (_, _, _) = route_payment(&nodes[0], &[&nodes[1]], payment_amt);
1536
1537         // And this last payment previously resulted in nodes[1] closing on its inbound-channel
1538         // counterparty, because it counted all the previous dust HTLCs against nodes[0]'s commitment
1539         // transaction fee and therefore perceived this next payment as a channel reserve violation.
1540         let (_, _, _) = route_payment(&nodes[0], &[&nodes[1]], payment_amt);
1541 }
1542
1543 #[test]
1544 fn test_chan_reserve_violation_inbound_htlc_inbound_chan() {
1545         let chanmon_cfgs = create_chanmon_cfgs(3);
1546         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
1547         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
1548         let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs);
1549         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 95000000, InitFeatures::known(), InitFeatures::known());
1550         let _ = create_announced_chan_between_nodes_with_value(&nodes, 1, 2, 100000, 95000000, InitFeatures::known(), InitFeatures::known());
1551
1552         let feemsat = 239;
1553         let total_routing_fee_msat = (nodes.len() - 2) as u64 * feemsat;
1554         let chan_stat = get_channel_value_stat!(nodes[0], chan.2);
1555         let feerate = get_feerate!(nodes[0], chan.2);
1556
1557         // Add a 2* and +1 for the fee spike reserve.
1558         let commit_tx_fee_2_htlc = 2*commit_tx_fee_msat(feerate, 2 + 1);
1559         let recv_value_1 = (chan_stat.value_to_self_msat - chan_stat.channel_reserve_msat - total_routing_fee_msat - commit_tx_fee_2_htlc)/2;
1560         let amt_msat_1 = recv_value_1 + total_routing_fee_msat;
1561
1562         // Add a pending HTLC.
1563         let (route_1, our_payment_hash_1, _, our_payment_secret_1) = get_route_and_payment_hash!(nodes[0], nodes[2], amt_msat_1);
1564         let payment_event_1 = {
1565                 nodes[0].node.send_payment(&route_1, our_payment_hash_1, &Some(our_payment_secret_1)).unwrap();
1566                 check_added_monitors!(nodes[0], 1);
1567
1568                 let mut events = nodes[0].node.get_and_clear_pending_msg_events();
1569                 assert_eq!(events.len(), 1);
1570                 SendEvent::from_event(events.remove(0))
1571         };
1572         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event_1.msgs[0]);
1573
1574         // Attempt to trigger a channel reserve violation --> payment failure.
1575         let commit_tx_fee_2_htlcs = commit_tx_fee_msat(feerate, 2);
1576         let recv_value_2 = chan_stat.value_to_self_msat - amt_msat_1 - chan_stat.channel_reserve_msat - total_routing_fee_msat - commit_tx_fee_2_htlcs + 1;
1577         let amt_msat_2 = recv_value_2 + total_routing_fee_msat;
1578         let (route_2, _, _, _) = get_route_and_payment_hash!(nodes[0], nodes[2], amt_msat_2);
1579
1580         // Need to manually create the update_add_htlc message to go around the channel reserve check in send_htlc()
1581         let secp_ctx = Secp256k1::new();
1582         let session_priv = SecretKey::from_slice(&[42; 32]).unwrap();
1583         let cur_height = nodes[0].node.best_block.read().unwrap().height() + 1;
1584         let onion_keys = onion_utils::construct_onion_keys(&secp_ctx, &route_2.paths[0], &session_priv).unwrap();
1585         let (onion_payloads, htlc_msat, htlc_cltv) = onion_utils::build_onion_payloads(&route_2.paths[0], recv_value_2, &None, cur_height, &None).unwrap();
1586         let onion_packet = onion_utils::construct_onion_packet(onion_payloads, onion_keys, [0; 32], &our_payment_hash_1);
1587         let msg = msgs::UpdateAddHTLC {
1588                 channel_id: chan.2,
1589                 htlc_id: 1,
1590                 amount_msat: htlc_msat + 1,
1591                 payment_hash: our_payment_hash_1,
1592                 cltv_expiry: htlc_cltv,
1593                 onion_routing_packet: onion_packet,
1594         };
1595
1596         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &msg);
1597         // Check that the payment failed and the channel is closed in response to the malicious UpdateAdd.
1598         nodes[1].logger.assert_log("lightning::ln::channelmanager".to_string(), "Remote HTLC add would put them under remote reserve value".to_string(), 1);
1599         assert_eq!(nodes[1].node.list_channels().len(), 1);
1600         let err_msg = check_closed_broadcast!(nodes[1], true).unwrap();
1601         assert_eq!(err_msg.data, "Remote HTLC add would put them under remote reserve value");
1602         check_added_monitors!(nodes[1], 1);
1603         check_closed_event!(nodes[1], 1, ClosureReason::ProcessingError { err: "Remote HTLC add would put them under remote reserve value".to_string() });
1604 }
1605
1606 #[test]
1607 fn test_inbound_outbound_capacity_is_not_zero() {
1608         let chanmon_cfgs = create_chanmon_cfgs(2);
1609         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
1610         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
1611         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
1612         let _ = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 95000000, InitFeatures::known(), InitFeatures::known());
1613         let channels0 = node_chanmgrs[0].list_channels();
1614         let channels1 = node_chanmgrs[1].list_channels();
1615         assert_eq!(channels0.len(), 1);
1616         assert_eq!(channels1.len(), 1);
1617
1618         let reserve = Channel::<EnforcingSigner>::get_holder_selected_channel_reserve_satoshis(100000);
1619         assert_eq!(channels0[0].inbound_capacity_msat, 95000000 - reserve*1000);
1620         assert_eq!(channels1[0].outbound_capacity_msat, 95000000 - reserve*1000);
1621
1622         assert_eq!(channels0[0].outbound_capacity_msat, 100000 * 1000 - 95000000 - reserve*1000);
1623         assert_eq!(channels1[0].inbound_capacity_msat, 100000 * 1000 - 95000000 - reserve*1000);
1624 }
1625
1626 fn commit_tx_fee_msat(feerate: u32, num_htlcs: u64) -> u64 {
1627         (COMMITMENT_TX_BASE_WEIGHT + num_htlcs * COMMITMENT_TX_WEIGHT_PER_HTLC) * feerate as u64 / 1000 * 1000
1628 }
1629
1630 #[test]
1631 fn test_channel_reserve_holding_cell_htlcs() {
1632         let chanmon_cfgs = create_chanmon_cfgs(3);
1633         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
1634         // When this test was written, the default base fee floated based on the HTLC count.
1635         // It is now fixed, so we simply set the fee to the expected value here.
1636         let mut config = test_default_channel_config();
1637         config.channel_options.forwarding_fee_base_msat = 239;
1638         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[Some(config.clone()), Some(config.clone()), Some(config.clone())]);
1639         let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs);
1640         let chan_1 = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 190000, 1001, InitFeatures::known(), InitFeatures::known());
1641         let chan_2 = create_announced_chan_between_nodes_with_value(&nodes, 1, 2, 190000, 1001, InitFeatures::known(), InitFeatures::known());
1642
1643         let mut stat01 = get_channel_value_stat!(nodes[0], chan_1.2);
1644         let mut stat11 = get_channel_value_stat!(nodes[1], chan_1.2);
1645
1646         let mut stat12 = get_channel_value_stat!(nodes[1], chan_2.2);
1647         let mut stat22 = get_channel_value_stat!(nodes[2], chan_2.2);
1648
1649         macro_rules! expect_forward {
1650                 ($node: expr) => {{
1651                         let mut events = $node.node.get_and_clear_pending_msg_events();
1652                         assert_eq!(events.len(), 1);
1653                         check_added_monitors!($node, 1);
1654                         let payment_event = SendEvent::from_event(events.remove(0));
1655                         payment_event
1656                 }}
1657         }
1658
1659         let feemsat = 239; // set above
1660         let total_fee_msat = (nodes.len() - 2) as u64 * feemsat;
1661         let feerate = get_feerate!(nodes[0], chan_1.2);
1662
1663         let recv_value_0 = stat01.counterparty_max_htlc_value_in_flight_msat - total_fee_msat;
1664
1665         // attempt to send amt_msat > their_max_htlc_value_in_flight_msat
1666         {
1667                 let (mut route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[2], recv_value_0);
1668                 route.paths[0].last_mut().unwrap().fee_msat += 1;
1669                 assert!(route.paths[0].iter().rev().skip(1).all(|h| h.fee_msat == feemsat));
1670                 unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)), true, APIError::ChannelUnavailable { ref err },
1671                         assert!(regex::Regex::new(r"Cannot send value that would put us over the max HTLC value in flight our peer will accept \(\d+\)").unwrap().is_match(err)));
1672                 assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
1673                 nodes[0].logger.assert_log_contains("lightning::ln::channelmanager".to_string(), "Cannot send value that would put us over the max HTLC value in flight our peer will accept".to_string(), 1);
1674         }
1675
1676         // channel reserve is bigger than their_max_htlc_value_in_flight_msat so loop to deplete
1677         // nodes[0]'s wealth
1678         loop {
1679                 let amt_msat = recv_value_0 + total_fee_msat;
1680                 // 3 for the 3 HTLCs that will be sent, 2* and +1 for the fee spike reserve.
1681                 // Also, ensure that each payment has enough to be over the dust limit to
1682                 // ensure it'll be included in each commit tx fee calculation.
1683                 let commit_tx_fee_all_htlcs = 2*commit_tx_fee_msat(feerate, 3 + 1);
1684                 let ensure_htlc_amounts_above_dust_buffer = 3 * (stat01.counterparty_dust_limit_msat + 1000);
1685                 if stat01.value_to_self_msat < stat01.channel_reserve_msat + commit_tx_fee_all_htlcs + ensure_htlc_amounts_above_dust_buffer + amt_msat {
1686                         break;
1687                 }
1688                 send_payment(&nodes[0], &vec![&nodes[1], &nodes[2]][..], recv_value_0);
1689
1690                 let (stat01_, stat11_, stat12_, stat22_) = (
1691                         get_channel_value_stat!(nodes[0], chan_1.2),
1692                         get_channel_value_stat!(nodes[1], chan_1.2),
1693                         get_channel_value_stat!(nodes[1], chan_2.2),
1694                         get_channel_value_stat!(nodes[2], chan_2.2),
1695                 );
1696
1697                 assert_eq!(stat01_.value_to_self_msat, stat01.value_to_self_msat - amt_msat);
1698                 assert_eq!(stat11_.value_to_self_msat, stat11.value_to_self_msat + amt_msat);
1699                 assert_eq!(stat12_.value_to_self_msat, stat12.value_to_self_msat - (amt_msat - feemsat));
1700                 assert_eq!(stat22_.value_to_self_msat, stat22.value_to_self_msat + (amt_msat - feemsat));
1701                 stat01 = stat01_; stat11 = stat11_; stat12 = stat12_; stat22 = stat22_;
1702         }
1703
1704         // adding pending output.
1705         // 2* and +1 HTLCs on the commit tx fee for the fee spike reserve.
1706         // The reason we're dividing by two here is as follows: the dividend is the total outbound liquidity
1707         // after fees, the channel reserve, and the fee spike buffer are removed. We eventually want to
1708         // divide this quantity into 3 portions, that will each be sent in an HTLC. This allows us
1709         // to test channel channel reserve policy at the edges of what amount is sendable, i.e.
1710         // cases where 1 msat over X amount will cause a payment failure, but anything less than
1711         // that can be sent successfully. So, dividing by two is a somewhat arbitrary way of getting
1712         // the amount of the first of these aforementioned 3 payments. The reason we split into 3 payments
1713         // is to test the behavior of the holding cell with respect to channel reserve and commit tx fee
1714         // policy.
1715         let commit_tx_fee_2_htlcs = 2*commit_tx_fee_msat(feerate, 2 + 1);
1716         let recv_value_1 = (stat01.value_to_self_msat - stat01.channel_reserve_msat - total_fee_msat - commit_tx_fee_2_htlcs)/2;
1717         let amt_msat_1 = recv_value_1 + total_fee_msat;
1718
1719         let (route_1, our_payment_hash_1, our_payment_preimage_1, our_payment_secret_1) = get_route_and_payment_hash!(nodes[0], nodes[2], recv_value_1);
1720         let payment_event_1 = {
1721                 nodes[0].node.send_payment(&route_1, our_payment_hash_1, &Some(our_payment_secret_1)).unwrap();
1722                 check_added_monitors!(nodes[0], 1);
1723
1724                 let mut events = nodes[0].node.get_and_clear_pending_msg_events();
1725                 assert_eq!(events.len(), 1);
1726                 SendEvent::from_event(events.remove(0))
1727         };
1728         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event_1.msgs[0]);
1729
1730         // channel reserve test with htlc pending output > 0
1731         let recv_value_2 = stat01.value_to_self_msat - amt_msat_1 - stat01.channel_reserve_msat - total_fee_msat - commit_tx_fee_2_htlcs;
1732         {
1733                 let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[2], recv_value_2 + 1);
1734                 unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)), true, APIError::ChannelUnavailable { ref err },
1735                         assert!(regex::Regex::new(r"Cannot send value that would put our balance under counterparty-announced channel reserve value \(\d+\)").unwrap().is_match(err)));
1736                 assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
1737         }
1738
1739         // split the rest to test holding cell
1740         let commit_tx_fee_3_htlcs = 2*commit_tx_fee_msat(feerate, 3 + 1);
1741         let additional_htlc_cost_msat = commit_tx_fee_3_htlcs - commit_tx_fee_2_htlcs;
1742         let recv_value_21 = recv_value_2/2 - additional_htlc_cost_msat/2;
1743         let recv_value_22 = recv_value_2 - recv_value_21 - total_fee_msat - additional_htlc_cost_msat;
1744         {
1745                 let stat = get_channel_value_stat!(nodes[0], chan_1.2);
1746                 assert_eq!(stat.value_to_self_msat - (stat.pending_outbound_htlcs_amount_msat + recv_value_21 + recv_value_22 + total_fee_msat + total_fee_msat + commit_tx_fee_3_htlcs), stat.channel_reserve_msat);
1747         }
1748
1749         // now see if they go through on both sides
1750         let (route_21, our_payment_hash_21, our_payment_preimage_21, our_payment_secret_21) = get_route_and_payment_hash!(nodes[0], nodes[2], recv_value_21);
1751         // but this will stuck in the holding cell
1752         nodes[0].node.send_payment(&route_21, our_payment_hash_21, &Some(our_payment_secret_21)).unwrap();
1753         check_added_monitors!(nodes[0], 0);
1754         let events = nodes[0].node.get_and_clear_pending_events();
1755         assert_eq!(events.len(), 0);
1756
1757         // test with outbound holding cell amount > 0
1758         {
1759                 let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[2], recv_value_22+1);
1760                 unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)), true, APIError::ChannelUnavailable { ref err },
1761                         assert!(regex::Regex::new(r"Cannot send value that would put our balance under counterparty-announced channel reserve value \(\d+\)").unwrap().is_match(err)));
1762                 assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
1763                 nodes[0].logger.assert_log_contains("lightning::ln::channelmanager".to_string(), "Cannot send value that would put our balance under counterparty-announced channel reserve value".to_string(), 2);
1764         }
1765
1766         let (route_22, our_payment_hash_22, our_payment_preimage_22, our_payment_secret_22) = get_route_and_payment_hash!(nodes[0], nodes[2], recv_value_22);
1767         // this will also stuck in the holding cell
1768         nodes[0].node.send_payment(&route_22, our_payment_hash_22, &Some(our_payment_secret_22)).unwrap();
1769         check_added_monitors!(nodes[0], 0);
1770         assert!(nodes[0].node.get_and_clear_pending_events().is_empty());
1771         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
1772
1773         // flush the pending htlc
1774         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &payment_event_1.commitment_msg);
1775         let (as_revoke_and_ack, as_commitment_signed) = get_revoke_commit_msgs!(nodes[1], nodes[0].node.get_our_node_id());
1776         check_added_monitors!(nodes[1], 1);
1777
1778         // the pending htlc should be promoted to committed
1779         nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &as_revoke_and_ack);
1780         check_added_monitors!(nodes[0], 1);
1781         let commitment_update_2 = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
1782
1783         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &as_commitment_signed);
1784         let bs_revoke_and_ack = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
1785         // No commitment_signed so get_event_msg's assert(len == 1) passes
1786         check_added_monitors!(nodes[0], 1);
1787
1788         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &bs_revoke_and_ack);
1789         assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
1790         check_added_monitors!(nodes[1], 1);
1791
1792         expect_pending_htlcs_forwardable!(nodes[1]);
1793
1794         let ref payment_event_11 = expect_forward!(nodes[1]);
1795         nodes[2].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &payment_event_11.msgs[0]);
1796         commitment_signed_dance!(nodes[2], nodes[1], payment_event_11.commitment_msg, false);
1797
1798         expect_pending_htlcs_forwardable!(nodes[2]);
1799         expect_payment_received!(nodes[2], our_payment_hash_1, our_payment_secret_1, recv_value_1);
1800
1801         // flush the htlcs in the holding cell
1802         assert_eq!(commitment_update_2.update_add_htlcs.len(), 2);
1803         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &commitment_update_2.update_add_htlcs[0]);
1804         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &commitment_update_2.update_add_htlcs[1]);
1805         commitment_signed_dance!(nodes[1], nodes[0], &commitment_update_2.commitment_signed, false);
1806         expect_pending_htlcs_forwardable!(nodes[1]);
1807
1808         let ref payment_event_3 = expect_forward!(nodes[1]);
1809         assert_eq!(payment_event_3.msgs.len(), 2);
1810         nodes[2].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &payment_event_3.msgs[0]);
1811         nodes[2].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &payment_event_3.msgs[1]);
1812
1813         commitment_signed_dance!(nodes[2], nodes[1], &payment_event_3.commitment_msg, false);
1814         expect_pending_htlcs_forwardable!(nodes[2]);
1815
1816         let events = nodes[2].node.get_and_clear_pending_events();
1817         assert_eq!(events.len(), 2);
1818         match events[0] {
1819                 Event::PaymentReceived { ref payment_hash, ref purpose, amt } => {
1820                         assert_eq!(our_payment_hash_21, *payment_hash);
1821                         assert_eq!(recv_value_21, amt);
1822                         match &purpose {
1823                                 PaymentPurpose::InvoicePayment { payment_preimage, payment_secret, .. } => {
1824                                         assert!(payment_preimage.is_none());
1825                                         assert_eq!(our_payment_secret_21, *payment_secret);
1826                                 },
1827                                 _ => panic!("expected PaymentPurpose::InvoicePayment")
1828                         }
1829                 },
1830                 _ => panic!("Unexpected event"),
1831         }
1832         match events[1] {
1833                 Event::PaymentReceived { ref payment_hash, ref purpose, amt } => {
1834                         assert_eq!(our_payment_hash_22, *payment_hash);
1835                         assert_eq!(recv_value_22, amt);
1836                         match &purpose {
1837                                 PaymentPurpose::InvoicePayment { payment_preimage, payment_secret, .. } => {
1838                                         assert!(payment_preimage.is_none());
1839                                         assert_eq!(our_payment_secret_22, *payment_secret);
1840                                 },
1841                                 _ => panic!("expected PaymentPurpose::InvoicePayment")
1842                         }
1843                 },
1844                 _ => panic!("Unexpected event"),
1845         }
1846
1847         claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), our_payment_preimage_1);
1848         claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), our_payment_preimage_21);
1849         claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), our_payment_preimage_22);
1850
1851         let commit_tx_fee_0_htlcs = 2*commit_tx_fee_msat(feerate, 1);
1852         let recv_value_3 = commit_tx_fee_2_htlcs - commit_tx_fee_0_htlcs - total_fee_msat;
1853         send_payment(&nodes[0], &vec![&nodes[1], &nodes[2]][..], recv_value_3);
1854
1855         let commit_tx_fee_1_htlc = 2*commit_tx_fee_msat(feerate, 1 + 1);
1856         let expected_value_to_self = stat01.value_to_self_msat - (recv_value_1 + total_fee_msat) - (recv_value_21 + total_fee_msat) - (recv_value_22 + total_fee_msat) - (recv_value_3 + total_fee_msat);
1857         let stat0 = get_channel_value_stat!(nodes[0], chan_1.2);
1858         assert_eq!(stat0.value_to_self_msat, expected_value_to_self);
1859         assert_eq!(stat0.value_to_self_msat, stat0.channel_reserve_msat + commit_tx_fee_1_htlc);
1860
1861         let stat2 = get_channel_value_stat!(nodes[2], chan_2.2);
1862         assert_eq!(stat2.value_to_self_msat, stat22.value_to_self_msat + recv_value_1 + recv_value_21 + recv_value_22 + recv_value_3);
1863 }
1864
1865 #[test]
1866 fn channel_reserve_in_flight_removes() {
1867         // In cases where one side claims an HTLC, it thinks it has additional available funds that it
1868         // can send to its counterparty, but due to update ordering, the other side may not yet have
1869         // considered those HTLCs fully removed.
1870         // This tests that we don't count HTLCs which will not be included in the next remote
1871         // commitment transaction towards the reserve value (as it implies no commitment transaction
1872         // will be generated which violates the remote reserve value).
1873         // This was broken previously, and discovered by the chanmon_fail_consistency fuzz test.
1874         // To test this we:
1875         //  * route two HTLCs from A to B (note that, at a high level, this test is checking that, when
1876         //    you consider the values of both of these HTLCs, B may not send an HTLC back to A, but if
1877         //    you only consider the value of the first HTLC, it may not),
1878         //  * start routing a third HTLC from A to B,
1879         //  * claim the first two HTLCs (though B will generate an update_fulfill for one, and put
1880         //    the other claim in its holding cell, as it immediately goes into AwaitingRAA),
1881         //  * deliver the first fulfill from B
1882         //  * deliver the update_add and an RAA from A, resulting in B freeing the second holding cell
1883         //    claim,
1884         //  * deliver A's response CS and RAA.
1885         //    This results in A having the second HTLC in AwaitingRemovedRemoteRevoke, but B having
1886         //    removed it fully. B now has the push_msat plus the first two HTLCs in value.
1887         //  * Now B happily sends another HTLC, potentially violating its reserve value from A's point
1888         //    of view (if A counts the AwaitingRemovedRemoteRevoke HTLC).
1889         let chanmon_cfgs = create_chanmon_cfgs(2);
1890         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
1891         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
1892         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
1893         let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
1894         let logger = test_utils::TestLogger::new();
1895
1896         let b_chan_values = get_channel_value_stat!(nodes[1], chan_1.2);
1897         // Route the first two HTLCs.
1898         let (payment_preimage_1, _, _) = route_payment(&nodes[0], &[&nodes[1]], b_chan_values.channel_reserve_msat - b_chan_values.value_to_self_msat - 10000);
1899         let (payment_preimage_2, _, _) = route_payment(&nodes[0], &[&nodes[1]], 20000);
1900
1901         // Start routing the third HTLC (this is just used to get everyone in the right state).
1902         let (payment_preimage_3, payment_hash_3, payment_secret_3) = get_payment_preimage_hash!(nodes[1]);
1903         let send_1 = {
1904                 let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
1905                 let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], 100000, TEST_FINAL_CLTV, &logger).unwrap();
1906                 nodes[0].node.send_payment(&route, payment_hash_3, &Some(payment_secret_3)).unwrap();
1907                 check_added_monitors!(nodes[0], 1);
1908                 let mut events = nodes[0].node.get_and_clear_pending_msg_events();
1909                 assert_eq!(events.len(), 1);
1910                 SendEvent::from_event(events.remove(0))
1911         };
1912
1913         // Now claim both of the first two HTLCs on B's end, putting B in AwaitingRAA and generating an
1914         // initial fulfill/CS.
1915         assert!(nodes[1].node.claim_funds(payment_preimage_1));
1916         check_added_monitors!(nodes[1], 1);
1917         let bs_removes = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
1918
1919         // This claim goes in B's holding cell, allowing us to have a pending B->A RAA which does not
1920         // remove the second HTLC when we send the HTLC back from B to A.
1921         assert!(nodes[1].node.claim_funds(payment_preimage_2));
1922         check_added_monitors!(nodes[1], 1);
1923         assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
1924
1925         nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &bs_removes.update_fulfill_htlcs[0]);
1926         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &bs_removes.commitment_signed);
1927         check_added_monitors!(nodes[0], 1);
1928         let as_raa = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
1929         expect_payment_sent!(nodes[0], payment_preimage_1);
1930
1931         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &send_1.msgs[0]);
1932         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &send_1.commitment_msg);
1933         check_added_monitors!(nodes[1], 1);
1934         // B is already AwaitingRAA, so cant generate a CS here
1935         let bs_raa = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
1936
1937         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_raa);
1938         check_added_monitors!(nodes[1], 1);
1939         let bs_cs = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
1940
1941         nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_raa);
1942         check_added_monitors!(nodes[0], 1);
1943         let as_cs = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
1944
1945         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &as_cs.commitment_signed);
1946         check_added_monitors!(nodes[1], 1);
1947         let bs_raa = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
1948
1949         // The second HTLCis removed, but as A is in AwaitingRAA it can't generate a CS here, so the
1950         // RAA that B generated above doesn't fully resolve the second HTLC from A's point of view.
1951         // However, the RAA A generates here *does* fully resolve the HTLC from B's point of view (as A
1952         // can no longer broadcast a commitment transaction with it and B has the preimage so can go
1953         // on-chain as necessary).
1954         nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &bs_cs.update_fulfill_htlcs[0]);
1955         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &bs_cs.commitment_signed);
1956         check_added_monitors!(nodes[0], 1);
1957         let as_raa = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
1958         expect_payment_sent!(nodes[0], payment_preimage_2);
1959
1960         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_raa);
1961         check_added_monitors!(nodes[1], 1);
1962         assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
1963
1964         expect_pending_htlcs_forwardable!(nodes[1]);
1965         expect_payment_received!(nodes[1], payment_hash_3, payment_secret_3, 100000);
1966
1967         // Note that as this RAA was generated before the delivery of the update_fulfill it shouldn't
1968         // resolve the second HTLC from A's point of view.
1969         nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_raa);
1970         check_added_monitors!(nodes[0], 1);
1971         let as_cs = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
1972
1973         // Now that B doesn't have the second RAA anymore, but A still does, send a payment from B back
1974         // to A to ensure that A doesn't count the almost-removed HTLC in update_add processing.
1975         let (payment_preimage_4, payment_hash_4, payment_secret_4) = get_payment_preimage_hash!(nodes[0]);
1976         let send_2 = {
1977                 let net_graph_msg_handler = &nodes[1].net_graph_msg_handler;
1978                 let route = get_route(&nodes[1].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[0].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], 10000, TEST_FINAL_CLTV, &logger).unwrap();
1979                 nodes[1].node.send_payment(&route, payment_hash_4, &Some(payment_secret_4)).unwrap();
1980                 check_added_monitors!(nodes[1], 1);
1981                 let mut events = nodes[1].node.get_and_clear_pending_msg_events();
1982                 assert_eq!(events.len(), 1);
1983                 SendEvent::from_event(events.remove(0))
1984         };
1985
1986         nodes[0].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &send_2.msgs[0]);
1987         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &send_2.commitment_msg);
1988         check_added_monitors!(nodes[0], 1);
1989         let as_raa = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
1990
1991         // Now just resolve all the outstanding messages/HTLCs for completeness...
1992
1993         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &as_cs.commitment_signed);
1994         check_added_monitors!(nodes[1], 1);
1995         let bs_raa = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
1996
1997         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_raa);
1998         check_added_monitors!(nodes[1], 1);
1999
2000         nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_raa);
2001         check_added_monitors!(nodes[0], 1);
2002         let as_cs = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
2003
2004         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &as_cs.commitment_signed);
2005         check_added_monitors!(nodes[1], 1);
2006         let bs_raa = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
2007
2008         nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_raa);
2009         check_added_monitors!(nodes[0], 1);
2010
2011         expect_pending_htlcs_forwardable!(nodes[0]);
2012         expect_payment_received!(nodes[0], payment_hash_4, payment_secret_4, 10000);
2013
2014         claim_payment(&nodes[1], &[&nodes[0]], payment_preimage_4);
2015         claim_payment(&nodes[0], &[&nodes[1]], payment_preimage_3);
2016 }
2017
2018 #[test]
2019 fn channel_monitor_network_test() {
2020         // Simple test which builds a network of ChannelManagers, connects them to each other, and
2021         // tests that ChannelMonitor is able to recover from various states.
2022         let chanmon_cfgs = create_chanmon_cfgs(5);
2023         let node_cfgs = create_node_cfgs(5, &chanmon_cfgs);
2024         let node_chanmgrs = create_node_chanmgrs(5, &node_cfgs, &[None, None, None, None, None]);
2025         let nodes = create_network(5, &node_cfgs, &node_chanmgrs);
2026
2027         // Create some initial channels
2028         let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
2029         let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2, InitFeatures::known(), InitFeatures::known());
2030         let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3, InitFeatures::known(), InitFeatures::known());
2031         let chan_4 = create_announced_chan_between_nodes(&nodes, 3, 4, InitFeatures::known(), InitFeatures::known());
2032
2033         // Make sure all nodes are at the same starting height
2034         connect_blocks(&nodes[0], 4*CHAN_CONFIRM_DEPTH + 1 - nodes[0].best_block_info().1);
2035         connect_blocks(&nodes[1], 4*CHAN_CONFIRM_DEPTH + 1 - nodes[1].best_block_info().1);
2036         connect_blocks(&nodes[2], 4*CHAN_CONFIRM_DEPTH + 1 - nodes[2].best_block_info().1);
2037         connect_blocks(&nodes[3], 4*CHAN_CONFIRM_DEPTH + 1 - nodes[3].best_block_info().1);
2038         connect_blocks(&nodes[4], 4*CHAN_CONFIRM_DEPTH + 1 - nodes[4].best_block_info().1);
2039
2040         // Rebalance the network a bit by relaying one payment through all the channels...
2041         send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2042         send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2043         send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2044         send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2045
2046         // Simple case with no pending HTLCs:
2047         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), true);
2048         check_added_monitors!(nodes[1], 1);
2049         check_closed_broadcast!(nodes[1], false);
2050         {
2051                 let mut node_txn = test_txn_broadcast(&nodes[1], &chan_1, None, HTLCType::NONE);
2052                 assert_eq!(node_txn.len(), 1);
2053                 mine_transaction(&nodes[0], &node_txn[0]);
2054                 check_added_monitors!(nodes[0], 1);
2055                 test_txn_broadcast(&nodes[0], &chan_1, None, HTLCType::NONE);
2056         }
2057         check_closed_broadcast!(nodes[0], true);
2058         assert_eq!(nodes[0].node.list_channels().len(), 0);
2059         assert_eq!(nodes[1].node.list_channels().len(), 1);
2060         check_closed_event!(nodes[0], 1, ClosureReason::CommitmentTxConfirmed);
2061         check_closed_event!(nodes[1], 1, ClosureReason::DisconnectedPeer);
2062
2063         // One pending HTLC is discarded by the force-close:
2064         let payment_preimage_1 = route_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 3000000).0;
2065
2066         // Simple case of one pending HTLC to HTLC-Timeout (note that the HTLC-Timeout is not
2067         // broadcasted until we reach the timelock time).
2068         nodes[1].node.peer_disconnected(&nodes[2].node.get_our_node_id(), true);
2069         check_closed_broadcast!(nodes[1], false);
2070         check_added_monitors!(nodes[1], 1);
2071         {
2072                 let mut node_txn = test_txn_broadcast(&nodes[1], &chan_2, None, HTLCType::NONE);
2073                 connect_blocks(&nodes[1], TEST_FINAL_CLTV + LATENCY_GRACE_PERIOD_BLOCKS + MIN_CLTV_EXPIRY_DELTA as u32 + 1);
2074                 test_txn_broadcast(&nodes[1], &chan_2, None, HTLCType::TIMEOUT);
2075                 mine_transaction(&nodes[2], &node_txn[0]);
2076                 check_added_monitors!(nodes[2], 1);
2077                 test_txn_broadcast(&nodes[2], &chan_2, None, HTLCType::NONE);
2078         }
2079         check_closed_broadcast!(nodes[2], true);
2080         assert_eq!(nodes[1].node.list_channels().len(), 0);
2081         assert_eq!(nodes[2].node.list_channels().len(), 1);
2082         check_closed_event!(nodes[1], 1, ClosureReason::DisconnectedPeer);
2083         check_closed_event!(nodes[2], 1, ClosureReason::CommitmentTxConfirmed);
2084
2085         macro_rules! claim_funds {
2086                 ($node: expr, $prev_node: expr, $preimage: expr) => {
2087                         {
2088                                 assert!($node.node.claim_funds($preimage));
2089                                 check_added_monitors!($node, 1);
2090
2091                                 let events = $node.node.get_and_clear_pending_msg_events();
2092                                 assert_eq!(events.len(), 1);
2093                                 match events[0] {
2094                                         MessageSendEvent::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fail_htlcs, .. } } => {
2095                                                 assert!(update_add_htlcs.is_empty());
2096                                                 assert!(update_fail_htlcs.is_empty());
2097                                                 assert_eq!(*node_id, $prev_node.node.get_our_node_id());
2098                                         },
2099                                         _ => panic!("Unexpected event"),
2100                                 };
2101                         }
2102                 }
2103         }
2104
2105         // nodes[3] gets the preimage, but nodes[2] already disconnected, resulting in a nodes[2]
2106         // HTLC-Timeout and a nodes[3] claim against it (+ its own announces)
2107         nodes[2].node.peer_disconnected(&nodes[3].node.get_our_node_id(), true);
2108         check_added_monitors!(nodes[2], 1);
2109         check_closed_broadcast!(nodes[2], false);
2110         let node2_commitment_txid;
2111         {
2112                 let node_txn = test_txn_broadcast(&nodes[2], &chan_3, None, HTLCType::NONE);
2113                 connect_blocks(&nodes[2], TEST_FINAL_CLTV + LATENCY_GRACE_PERIOD_BLOCKS + MIN_CLTV_EXPIRY_DELTA as u32 + 1);
2114                 test_txn_broadcast(&nodes[2], &chan_3, None, HTLCType::TIMEOUT);
2115                 node2_commitment_txid = node_txn[0].txid();
2116
2117                 // Claim the payment on nodes[3], giving it knowledge of the preimage
2118                 claim_funds!(nodes[3], nodes[2], payment_preimage_1);
2119                 mine_transaction(&nodes[3], &node_txn[0]);
2120                 check_added_monitors!(nodes[3], 1);
2121                 check_preimage_claim(&nodes[3], &node_txn);
2122         }
2123         check_closed_broadcast!(nodes[3], true);
2124         assert_eq!(nodes[2].node.list_channels().len(), 0);
2125         assert_eq!(nodes[3].node.list_channels().len(), 1);
2126         check_closed_event!(nodes[2], 1, ClosureReason::DisconnectedPeer);
2127         check_closed_event!(nodes[3], 1, ClosureReason::CommitmentTxConfirmed);
2128
2129         // Drop the ChannelMonitor for the previous channel to avoid it broadcasting transactions and
2130         // confusing us in the following tests.
2131         let chan_3_mon = nodes[3].chain_monitor.chain_monitor.monitors.write().unwrap().remove(&OutPoint { txid: chan_3.3.txid(), index: 0 }).unwrap();
2132
2133         // One pending HTLC to time out:
2134         let payment_preimage_2 = route_payment(&nodes[3], &vec!(&nodes[4])[..], 3000000).0;
2135         // CLTV expires at TEST_FINAL_CLTV + 1 (current height) + 1 (added in send_payment for
2136         // buffer space).
2137
2138         let (close_chan_update_1, close_chan_update_2) = {
2139                 connect_blocks(&nodes[3], TEST_FINAL_CLTV + LATENCY_GRACE_PERIOD_BLOCKS + 1);
2140                 let events = nodes[3].node.get_and_clear_pending_msg_events();
2141                 assert_eq!(events.len(), 2);
2142                 let close_chan_update_1 = match events[0] {
2143                         MessageSendEvent::BroadcastChannelUpdate { ref msg } => {
2144                                 msg.clone()
2145                         },
2146                         _ => panic!("Unexpected event"),
2147                 };
2148                 match events[1] {
2149                         MessageSendEvent::HandleError { action: ErrorAction::SendErrorMessage { .. }, node_id } => {
2150                                 assert_eq!(node_id, nodes[4].node.get_our_node_id());
2151                         },
2152                         _ => panic!("Unexpected event"),
2153                 }
2154                 check_added_monitors!(nodes[3], 1);
2155
2156                 // Clear bumped claiming txn spending node 2 commitment tx. Bumped txn are generated after reaching some height timer.
2157                 {
2158                         let mut node_txn = nodes[3].tx_broadcaster.txn_broadcasted.lock().unwrap();
2159                         node_txn.retain(|tx| {
2160                                 if tx.input[0].previous_output.txid == node2_commitment_txid {
2161                                         false
2162                                 } else { true }
2163                         });
2164                 }
2165
2166                 let node_txn = test_txn_broadcast(&nodes[3], &chan_4, None, HTLCType::TIMEOUT);
2167
2168                 // Claim the payment on nodes[4], giving it knowledge of the preimage
2169                 claim_funds!(nodes[4], nodes[3], payment_preimage_2);
2170
2171                 connect_blocks(&nodes[4], TEST_FINAL_CLTV - CLTV_CLAIM_BUFFER + 2);
2172                 let events = nodes[4].node.get_and_clear_pending_msg_events();
2173                 assert_eq!(events.len(), 2);
2174                 let close_chan_update_2 = match events[0] {
2175                         MessageSendEvent::BroadcastChannelUpdate { ref msg } => {
2176                                 msg.clone()
2177                         },
2178                         _ => panic!("Unexpected event"),
2179                 };
2180                 match events[1] {
2181                         MessageSendEvent::HandleError { action: ErrorAction::SendErrorMessage { .. }, node_id } => {
2182                                 assert_eq!(node_id, nodes[3].node.get_our_node_id());
2183                         },
2184                         _ => panic!("Unexpected event"),
2185                 }
2186                 check_added_monitors!(nodes[4], 1);
2187                 test_txn_broadcast(&nodes[4], &chan_4, None, HTLCType::SUCCESS);
2188
2189                 mine_transaction(&nodes[4], &node_txn[0]);
2190                 check_preimage_claim(&nodes[4], &node_txn);
2191                 (close_chan_update_1, close_chan_update_2)
2192         };
2193         nodes[3].net_graph_msg_handler.handle_channel_update(&close_chan_update_2).unwrap();
2194         nodes[4].net_graph_msg_handler.handle_channel_update(&close_chan_update_1).unwrap();
2195         assert_eq!(nodes[3].node.list_channels().len(), 0);
2196         assert_eq!(nodes[4].node.list_channels().len(), 0);
2197
2198         nodes[3].chain_monitor.chain_monitor.monitors.write().unwrap().insert(OutPoint { txid: chan_3.3.txid(), index: 0 }, chan_3_mon);
2199         check_closed_event!(nodes[3], 1, ClosureReason::CommitmentTxConfirmed);
2200         check_closed_event!(nodes[4], 1, ClosureReason::CommitmentTxConfirmed);
2201 }
2202
2203 #[test]
2204 fn test_justice_tx() {
2205         // Test justice txn built on revoked HTLC-Success tx, against both sides
2206         let mut alice_config = UserConfig::default();
2207         alice_config.channel_options.announced_channel = true;
2208         alice_config.peer_channel_config_limits.force_announced_channel_preference = false;
2209         alice_config.own_channel_config.our_to_self_delay = 6 * 24 * 5;
2210         let mut bob_config = UserConfig::default();
2211         bob_config.channel_options.announced_channel = true;
2212         bob_config.peer_channel_config_limits.force_announced_channel_preference = false;
2213         bob_config.own_channel_config.our_to_self_delay = 6 * 24 * 3;
2214         let user_cfgs = [Some(alice_config), Some(bob_config)];
2215         let mut chanmon_cfgs = create_chanmon_cfgs(2);
2216         chanmon_cfgs[0].keys_manager.disable_revocation_policy_check = true;
2217         chanmon_cfgs[1].keys_manager.disable_revocation_policy_check = true;
2218         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
2219         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &user_cfgs);
2220         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
2221         // Create some new channels:
2222         let chan_5 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
2223
2224         // A pending HTLC which will be revoked:
2225         let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
2226         // Get the will-be-revoked local txn from nodes[0]
2227         let revoked_local_txn = get_local_commitment_txn!(nodes[0], chan_5.2);
2228         assert_eq!(revoked_local_txn.len(), 2); // First commitment tx, then HTLC tx
2229         assert_eq!(revoked_local_txn[0].input.len(), 1);
2230         assert_eq!(revoked_local_txn[0].input[0].previous_output.txid, chan_5.3.txid());
2231         assert_eq!(revoked_local_txn[0].output.len(), 2); // Only HTLC and output back to 0 are present
2232         assert_eq!(revoked_local_txn[1].input.len(), 1);
2233         assert_eq!(revoked_local_txn[1].input[0].previous_output.txid, revoked_local_txn[0].txid());
2234         assert_eq!(revoked_local_txn[1].input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT); // HTLC-Timeout
2235         // Revoke the old state
2236         claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage_3);
2237
2238         {
2239                 mine_transaction(&nodes[1], &revoked_local_txn[0]);
2240                 {
2241                         let mut node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
2242                         assert_eq!(node_txn.len(), 2); // ChannelMonitor: penalty tx, ChannelManager: local commitment tx
2243                         assert_eq!(node_txn[0].input.len(), 2); // We should claim the revoked output and the HTLC output
2244
2245                         check_spends!(node_txn[0], revoked_local_txn[0]);
2246                         node_txn.swap_remove(0);
2247                         node_txn.truncate(1);
2248                 }
2249                 check_added_monitors!(nodes[1], 1);
2250                 check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
2251                 test_txn_broadcast(&nodes[1], &chan_5, None, HTLCType::NONE);
2252
2253                 mine_transaction(&nodes[0], &revoked_local_txn[0]);
2254                 connect_blocks(&nodes[0], TEST_FINAL_CLTV - 1); // Confirm blocks until the HTLC expires
2255                 // Verify broadcast of revoked HTLC-timeout
2256                 let node_txn = test_txn_broadcast(&nodes[0], &chan_5, Some(revoked_local_txn[0].clone()), HTLCType::TIMEOUT);
2257                 check_added_monitors!(nodes[0], 1);
2258                 check_closed_event!(nodes[0], 1, ClosureReason::CommitmentTxConfirmed);
2259                 // Broadcast revoked HTLC-timeout on node 1
2260                 mine_transaction(&nodes[1], &node_txn[1]);
2261                 test_revoked_htlc_claim_txn_broadcast(&nodes[1], node_txn[1].clone(), revoked_local_txn[0].clone());
2262         }
2263         get_announce_close_broadcast_events(&nodes, 0, 1);
2264
2265         assert_eq!(nodes[0].node.list_channels().len(), 0);
2266         assert_eq!(nodes[1].node.list_channels().len(), 0);
2267
2268         // We test justice_tx build by A on B's revoked HTLC-Success tx
2269         // Create some new channels:
2270         let chan_6 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
2271         {
2272                 let mut node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
2273                 node_txn.clear();
2274         }
2275
2276         // A pending HTLC which will be revoked:
2277         let payment_preimage_4 = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
2278         // Get the will-be-revoked local txn from B
2279         let revoked_local_txn = get_local_commitment_txn!(nodes[1], chan_6.2);
2280         assert_eq!(revoked_local_txn.len(), 1); // Only commitment tx
2281         assert_eq!(revoked_local_txn[0].input.len(), 1);
2282         assert_eq!(revoked_local_txn[0].input[0].previous_output.txid, chan_6.3.txid());
2283         assert_eq!(revoked_local_txn[0].output.len(), 2); // Only HTLC and output back to A are present
2284         // Revoke the old state
2285         claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage_4);
2286         {
2287                 mine_transaction(&nodes[0], &revoked_local_txn[0]);
2288                 {
2289                         let mut node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
2290                         assert_eq!(node_txn.len(), 2); //ChannelMonitor: penalty tx, ChannelManager: local commitment tx
2291                         assert_eq!(node_txn[0].input.len(), 1); // We claim the received HTLC output
2292
2293                         check_spends!(node_txn[0], revoked_local_txn[0]);
2294                         node_txn.swap_remove(0);
2295                 }
2296                 check_added_monitors!(nodes[0], 1);
2297                 test_txn_broadcast(&nodes[0], &chan_6, None, HTLCType::NONE);
2298
2299                 mine_transaction(&nodes[1], &revoked_local_txn[0]);
2300                 check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
2301                 let node_txn = test_txn_broadcast(&nodes[1], &chan_6, Some(revoked_local_txn[0].clone()), HTLCType::SUCCESS);
2302                 check_added_monitors!(nodes[1], 1);
2303                 mine_transaction(&nodes[0], &node_txn[1]);
2304                 check_closed_event!(nodes[0], 1, ClosureReason::CommitmentTxConfirmed);
2305                 test_revoked_htlc_claim_txn_broadcast(&nodes[0], node_txn[1].clone(), revoked_local_txn[0].clone());
2306         }
2307         get_announce_close_broadcast_events(&nodes, 0, 1);
2308         assert_eq!(nodes[0].node.list_channels().len(), 0);
2309         assert_eq!(nodes[1].node.list_channels().len(), 0);
2310 }
2311
2312 #[test]
2313 fn revoked_output_claim() {
2314         // Simple test to ensure a node will claim a revoked output when a stale remote commitment
2315         // transaction is broadcast by its counterparty
2316         let chanmon_cfgs = create_chanmon_cfgs(2);
2317         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
2318         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
2319         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
2320         let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
2321         // node[0] is gonna to revoke an old state thus node[1] should be able to claim the revoked output
2322         let revoked_local_txn = get_local_commitment_txn!(nodes[0], chan_1.2);
2323         assert_eq!(revoked_local_txn.len(), 1);
2324         // Only output is the full channel value back to nodes[0]:
2325         assert_eq!(revoked_local_txn[0].output.len(), 1);
2326         // Send a payment through, updating everyone's latest commitment txn
2327         send_payment(&nodes[0], &vec!(&nodes[1])[..], 5000000);
2328
2329         // Inform nodes[1] that nodes[0] broadcast a stale tx
2330         mine_transaction(&nodes[1], &revoked_local_txn[0]);
2331         check_added_monitors!(nodes[1], 1);
2332         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
2333         let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
2334         assert_eq!(node_txn.len(), 2); // ChannelMonitor: justice tx against revoked to_local output, ChannelManager: local commitment tx
2335
2336         check_spends!(node_txn[0], revoked_local_txn[0]);
2337         check_spends!(node_txn[1], chan_1.3);
2338
2339         // Inform nodes[0] that a watchtower cheated on its behalf, so it will force-close the chan
2340         mine_transaction(&nodes[0], &revoked_local_txn[0]);
2341         get_announce_close_broadcast_events(&nodes, 0, 1);
2342         check_added_monitors!(nodes[0], 1);
2343         check_closed_event!(nodes[0], 1, ClosureReason::CommitmentTxConfirmed);
2344 }
2345
2346 #[test]
2347 fn claim_htlc_outputs_shared_tx() {
2348         // Node revoked old state, htlcs haven't time out yet, claim them in shared justice tx
2349         let mut chanmon_cfgs = create_chanmon_cfgs(2);
2350         chanmon_cfgs[0].keys_manager.disable_revocation_policy_check = true;
2351         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
2352         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
2353         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
2354
2355         // Create some new channel:
2356         let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
2357
2358         // Rebalance the network to generate htlc in the two directions
2359         send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
2360         // node[0] is gonna to revoke an old state thus node[1] should be able to claim both offered/received HTLC outputs on top of commitment tx
2361         let payment_preimage_1 = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
2362         let (_payment_preimage_2, payment_hash_2, _) = route_payment(&nodes[1], &vec!(&nodes[0])[..], 3000000);
2363
2364         // Get the will-be-revoked local txn from node[0]
2365         let revoked_local_txn = get_local_commitment_txn!(nodes[0], chan_1.2);
2366         assert_eq!(revoked_local_txn.len(), 2); // commitment tx + 1 HTLC-Timeout tx
2367         assert_eq!(revoked_local_txn[0].input.len(), 1);
2368         assert_eq!(revoked_local_txn[0].input[0].previous_output.txid, chan_1.3.txid());
2369         assert_eq!(revoked_local_txn[1].input.len(), 1);
2370         assert_eq!(revoked_local_txn[1].input[0].previous_output.txid, revoked_local_txn[0].txid());
2371         assert_eq!(revoked_local_txn[1].input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT); // HTLC-Timeout
2372         check_spends!(revoked_local_txn[1], revoked_local_txn[0]);
2373
2374         //Revoke the old state
2375         claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage_1);
2376
2377         {
2378                 mine_transaction(&nodes[0], &revoked_local_txn[0]);
2379                 check_added_monitors!(nodes[0], 1);
2380                 check_closed_event!(nodes[0], 1, ClosureReason::CommitmentTxConfirmed);
2381                 mine_transaction(&nodes[1], &revoked_local_txn[0]);
2382                 check_added_monitors!(nodes[1], 1);
2383                 check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
2384                 connect_blocks(&nodes[1], ANTI_REORG_DELAY - 1);
2385                 expect_payment_failed!(nodes[1], payment_hash_2, true);
2386
2387                 let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
2388                 assert_eq!(node_txn.len(), 2); // ChannelMonitor: penalty tx, ChannelManager: local commitment
2389
2390                 assert_eq!(node_txn[0].input.len(), 3); // Claim the revoked output + both revoked HTLC outputs
2391                 check_spends!(node_txn[0], revoked_local_txn[0]);
2392
2393                 let mut witness_lens = BTreeSet::new();
2394                 witness_lens.insert(node_txn[0].input[0].witness.last().unwrap().len());
2395                 witness_lens.insert(node_txn[0].input[1].witness.last().unwrap().len());
2396                 witness_lens.insert(node_txn[0].input[2].witness.last().unwrap().len());
2397                 assert_eq!(witness_lens.len(), 3);
2398                 assert_eq!(*witness_lens.iter().skip(0).next().unwrap(), 77); // revoked to_local
2399                 assert_eq!(*witness_lens.iter().skip(1).next().unwrap(), OFFERED_HTLC_SCRIPT_WEIGHT); // revoked offered HTLC
2400                 assert_eq!(*witness_lens.iter().skip(2).next().unwrap(), ACCEPTED_HTLC_SCRIPT_WEIGHT); // revoked received HTLC
2401
2402                 // Next nodes[1] broadcasts its current local tx state:
2403                 assert_eq!(node_txn[1].input.len(), 1);
2404                 assert_eq!(node_txn[1].input[0].previous_output.txid, chan_1.3.txid()); //Spending funding tx unique txouput, tx broadcasted by ChannelManager
2405         }
2406         get_announce_close_broadcast_events(&nodes, 0, 1);
2407         assert_eq!(nodes[0].node.list_channels().len(), 0);
2408         assert_eq!(nodes[1].node.list_channels().len(), 0);
2409 }
2410
2411 #[test]
2412 fn claim_htlc_outputs_single_tx() {
2413         // Node revoked old state, htlcs have timed out, claim each of them in separated justice tx
2414         let mut chanmon_cfgs = create_chanmon_cfgs(2);
2415         chanmon_cfgs[0].keys_manager.disable_revocation_policy_check = true;
2416         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
2417         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
2418         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
2419
2420         let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
2421
2422         // Rebalance the network to generate htlc in the two directions
2423         send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
2424         // node[0] is gonna to revoke an old state thus node[1] should be able to claim both offered/received HTLC outputs on top of commitment tx, but this
2425         // time as two different claim transactions as we're gonna to timeout htlc with given a high current height
2426         let payment_preimage_1 = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
2427         let (_payment_preimage_2, payment_hash_2, _payment_secret_2) = route_payment(&nodes[1], &vec!(&nodes[0])[..], 3000000);
2428
2429         // Get the will-be-revoked local txn from node[0]
2430         let revoked_local_txn = get_local_commitment_txn!(nodes[0], chan_1.2);
2431
2432         //Revoke the old state
2433         claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage_1);
2434
2435         {
2436                 confirm_transaction_at(&nodes[0], &revoked_local_txn[0], 100);
2437                 check_added_monitors!(nodes[0], 1);
2438                 confirm_transaction_at(&nodes[1], &revoked_local_txn[0], 100);
2439                 check_added_monitors!(nodes[1], 1);
2440                 check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
2441                 let mut events = nodes[0].node.get_and_clear_pending_events();
2442                 expect_pending_htlcs_forwardable_from_events!(nodes[0], events[0..1], true);
2443                 match events[1] {
2444                         Event::ChannelClosed { reason: ClosureReason::CommitmentTxConfirmed, .. } => {}
2445                         _ => panic!("Unexpected event"),
2446                 }
2447
2448                 connect_blocks(&nodes[1], ANTI_REORG_DELAY - 1);
2449                 expect_payment_failed!(nodes[1], payment_hash_2, true);
2450
2451                 let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
2452                 assert_eq!(node_txn.len(), 9);
2453                 // ChannelMonitor: justice tx revoked offered htlc, justice tx revoked received htlc, justice tx revoked to_local (3)
2454                 // ChannelManager: local commmitment + local HTLC-timeout (2)
2455                 // ChannelMonitor: bumped justice tx, after one increase, bumps on HTLC aren't generated not being substantial anymore, bump on revoked to_local isn't generated due to more room for expiration (2)
2456                 // ChannelMonitor: local commitment + local HTLC-timeout (2)
2457
2458                 // Check the pair local commitment and HTLC-timeout broadcast due to HTLC expiration
2459                 assert_eq!(node_txn[0].input.len(), 1);
2460                 check_spends!(node_txn[0], chan_1.3);
2461                 assert_eq!(node_txn[1].input.len(), 1);
2462                 let witness_script = node_txn[1].input[0].witness.last().unwrap();
2463                 assert_eq!(witness_script.len(), OFFERED_HTLC_SCRIPT_WEIGHT); //Spending an offered htlc output
2464                 check_spends!(node_txn[1], node_txn[0]);
2465
2466                 // Justice transactions are indices 1-2-4
2467                 assert_eq!(node_txn[2].input.len(), 1);
2468                 assert_eq!(node_txn[3].input.len(), 1);
2469                 assert_eq!(node_txn[4].input.len(), 1);
2470
2471                 check_spends!(node_txn[2], revoked_local_txn[0]);
2472                 check_spends!(node_txn[3], revoked_local_txn[0]);
2473                 check_spends!(node_txn[4], revoked_local_txn[0]);
2474
2475                 let mut witness_lens = BTreeSet::new();
2476                 witness_lens.insert(node_txn[2].input[0].witness.last().unwrap().len());
2477                 witness_lens.insert(node_txn[3].input[0].witness.last().unwrap().len());
2478                 witness_lens.insert(node_txn[4].input[0].witness.last().unwrap().len());
2479                 assert_eq!(witness_lens.len(), 3);
2480                 assert_eq!(*witness_lens.iter().skip(0).next().unwrap(), 77); // revoked to_local
2481                 assert_eq!(*witness_lens.iter().skip(1).next().unwrap(), OFFERED_HTLC_SCRIPT_WEIGHT); // revoked offered HTLC
2482                 assert_eq!(*witness_lens.iter().skip(2).next().unwrap(), ACCEPTED_HTLC_SCRIPT_WEIGHT); // revoked received HTLC
2483         }
2484         get_announce_close_broadcast_events(&nodes, 0, 1);
2485         assert_eq!(nodes[0].node.list_channels().len(), 0);
2486         assert_eq!(nodes[1].node.list_channels().len(), 0);
2487 }
2488
2489 #[test]
2490 fn test_htlc_on_chain_success() {
2491         // Test that in case of a unilateral close onchain, we detect the state of output and pass
2492         // the preimage backward accordingly. So here we test that ChannelManager is
2493         // broadcasting the right event to other nodes in payment path.
2494         // We test with two HTLCs simultaneously as that was not handled correctly in the past.
2495         // A --------------------> B ----------------------> C (preimage)
2496         // First, C should claim the HTLC outputs via HTLC-Success when its own latest local
2497         // commitment transaction was broadcast.
2498         // Then, B should learn the preimage from said transactions, attempting to claim backwards
2499         // towards B.
2500         // B should be able to claim via preimage if A then broadcasts its local tx.
2501         // Finally, when A sees B's latest local commitment transaction it should be able to claim
2502         // the HTLC outputs via the preimage it learned (which, once confirmed should generate a
2503         // PaymentSent event).
2504
2505         let chanmon_cfgs = create_chanmon_cfgs(3);
2506         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
2507         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
2508         let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
2509
2510         // Create some initial channels
2511         let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
2512         let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2, InitFeatures::known(), InitFeatures::known());
2513
2514         // Ensure all nodes are at the same height
2515         let node_max_height = nodes.iter().map(|node| node.blocks.lock().unwrap().len()).max().unwrap() as u32;
2516         connect_blocks(&nodes[0], node_max_height - nodes[0].best_block_info().1);
2517         connect_blocks(&nodes[1], node_max_height - nodes[1].best_block_info().1);
2518         connect_blocks(&nodes[2], node_max_height - nodes[2].best_block_info().1);
2519
2520         // Rebalance the network a bit by relaying one payment through all the channels...
2521         send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 8000000);
2522         send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 8000000);
2523
2524         let (our_payment_preimage, _payment_hash, _payment_secret) = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), 3000000);
2525         let (our_payment_preimage_2, _payment_hash_2, _payment_secret_2) = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), 3000000);
2526
2527         // Broadcast legit commitment tx from C on B's chain
2528         // Broadcast HTLC Success transaction by C on received output from C's commitment tx on B's chain
2529         let commitment_tx = get_local_commitment_txn!(nodes[2], chan_2.2);
2530         assert_eq!(commitment_tx.len(), 1);
2531         check_spends!(commitment_tx[0], chan_2.3);
2532         nodes[2].node.claim_funds(our_payment_preimage);
2533         nodes[2].node.claim_funds(our_payment_preimage_2);
2534         check_added_monitors!(nodes[2], 2);
2535         let updates = get_htlc_update_msgs!(nodes[2], nodes[1].node.get_our_node_id());
2536         assert!(updates.update_add_htlcs.is_empty());
2537         assert!(updates.update_fail_htlcs.is_empty());
2538         assert!(updates.update_fail_malformed_htlcs.is_empty());
2539         assert_eq!(updates.update_fulfill_htlcs.len(), 1);
2540
2541         mine_transaction(&nodes[2], &commitment_tx[0]);
2542         check_closed_broadcast!(nodes[2], true);
2543         check_added_monitors!(nodes[2], 1);
2544         check_closed_event!(nodes[2], 1, ClosureReason::CommitmentTxConfirmed);
2545         let node_txn = nodes[2].tx_broadcaster.txn_broadcasted.lock().unwrap().clone(); // ChannelManager : 3 (commitment tx, 2*htlc-success tx), ChannelMonitor : 2 (2 * HTLC-Success tx)
2546         assert_eq!(node_txn.len(), 5);
2547         assert_eq!(node_txn[0], node_txn[3]);
2548         assert_eq!(node_txn[1], node_txn[4]);
2549         assert_eq!(node_txn[2], commitment_tx[0]);
2550         check_spends!(node_txn[0], commitment_tx[0]);
2551         check_spends!(node_txn[1], commitment_tx[0]);
2552         assert_eq!(node_txn[0].input[0].witness.clone().last().unwrap().len(), ACCEPTED_HTLC_SCRIPT_WEIGHT);
2553         assert_eq!(node_txn[1].input[0].witness.clone().last().unwrap().len(), ACCEPTED_HTLC_SCRIPT_WEIGHT);
2554         assert!(node_txn[0].output[0].script_pubkey.is_v0_p2wsh()); // revokeable output
2555         assert!(node_txn[1].output[0].script_pubkey.is_v0_p2wsh()); // revokeable output
2556         assert_eq!(node_txn[0].lock_time, 0);
2557         assert_eq!(node_txn[1].lock_time, 0);
2558
2559         // Verify that B's ChannelManager is able to extract preimage from HTLC Success tx and pass it backward
2560         let header = BlockHeader { version: 0x20000000, prev_blockhash: nodes[1].best_block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42};
2561         connect_block(&nodes[1], &Block { header, txdata: node_txn});
2562         connect_blocks(&nodes[1], TEST_FINAL_CLTV - 1); // Confirm blocks until the HTLC expires
2563         {
2564                 let mut added_monitors = nodes[1].chain_monitor.added_monitors.lock().unwrap();
2565                 assert_eq!(added_monitors.len(), 1);
2566                 assert_eq!(added_monitors[0].0.txid, chan_2.3.txid());
2567                 added_monitors.clear();
2568         }
2569         let forwarded_events = nodes[1].node.get_and_clear_pending_events();
2570         assert_eq!(forwarded_events.len(), 3);
2571         match forwarded_events[0] {
2572                 Event::ChannelClosed { reason: ClosureReason::CommitmentTxConfirmed, .. } => {}
2573                 _ => panic!("Unexpected event"),
2574         }
2575         if let Event::PaymentForwarded { fee_earned_msat: Some(1000), claim_from_onchain_tx: true } = forwarded_events[1] {
2576                 } else { panic!(); }
2577         if let Event::PaymentForwarded { fee_earned_msat: Some(1000), claim_from_onchain_tx: true } = forwarded_events[2] {
2578                 } else { panic!(); }
2579         let events = nodes[1].node.get_and_clear_pending_msg_events();
2580         {
2581                 let mut added_monitors = nodes[1].chain_monitor.added_monitors.lock().unwrap();
2582                 assert_eq!(added_monitors.len(), 2);
2583                 assert_eq!(added_monitors[0].0.txid, chan_1.3.txid());
2584                 assert_eq!(added_monitors[1].0.txid, chan_1.3.txid());
2585                 added_monitors.clear();
2586         }
2587         assert_eq!(events.len(), 3);
2588         match events[0] {
2589                 MessageSendEvent::BroadcastChannelUpdate { .. } => {},
2590                 _ => panic!("Unexpected event"),
2591         }
2592         match events[1] {
2593                 MessageSendEvent::HandleError { action: ErrorAction::SendErrorMessage { .. }, node_id: _ } => {},
2594                 _ => panic!("Unexpected event"),
2595         }
2596
2597         match events[2] {
2598                 MessageSendEvent::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fail_htlcs, ref update_fulfill_htlcs, ref update_fail_malformed_htlcs, .. } } => {
2599                         assert!(update_add_htlcs.is_empty());
2600                         assert!(update_fail_htlcs.is_empty());
2601                         assert_eq!(update_fulfill_htlcs.len(), 1);
2602                         assert!(update_fail_malformed_htlcs.is_empty());
2603                         assert_eq!(nodes[0].node.get_our_node_id(), *node_id);
2604                 },
2605                 _ => panic!("Unexpected event"),
2606         };
2607         macro_rules! check_tx_local_broadcast {
2608                 ($node: expr, $htlc_offered: expr, $commitment_tx: expr, $chan_tx: expr) => { {
2609                         let mut node_txn = $node.tx_broadcaster.txn_broadcasted.lock().unwrap();
2610                         assert_eq!(node_txn.len(), 3);
2611                         // Node[1]: ChannelManager: 3 (commitment tx, 2*HTLC-Timeout tx), ChannelMonitor: 2 (timeout tx)
2612                         // Node[0]: ChannelManager: 3 (commtiemtn tx, 2*HTLC-Timeout tx), ChannelMonitor: 2 HTLC-timeout
2613                         check_spends!(node_txn[1], $commitment_tx);
2614                         check_spends!(node_txn[2], $commitment_tx);
2615                         assert_ne!(node_txn[1].lock_time, 0);
2616                         assert_ne!(node_txn[2].lock_time, 0);
2617                         if $htlc_offered {
2618                                 assert_eq!(node_txn[1].input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
2619                                 assert_eq!(node_txn[2].input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
2620                                 assert!(node_txn[1].output[0].script_pubkey.is_v0_p2wsh()); // revokeable output
2621                                 assert!(node_txn[2].output[0].script_pubkey.is_v0_p2wsh()); // revokeable output
2622                         } else {
2623                                 assert_eq!(node_txn[1].input[0].witness.last().unwrap().len(), ACCEPTED_HTLC_SCRIPT_WEIGHT);
2624                                 assert_eq!(node_txn[2].input[0].witness.last().unwrap().len(), ACCEPTED_HTLC_SCRIPT_WEIGHT);
2625                                 assert!(node_txn[1].output[0].script_pubkey.is_v0_p2wpkh()); // direct payment
2626                                 assert!(node_txn[2].output[0].script_pubkey.is_v0_p2wpkh()); // direct payment
2627                         }
2628                         check_spends!(node_txn[0], $chan_tx);
2629                         assert_eq!(node_txn[0].input[0].witness.last().unwrap().len(), 71);
2630                         node_txn.clear();
2631                 } }
2632         }
2633         // nodes[1] now broadcasts its own local state as a fallback, suggesting an alternate
2634         // commitment transaction with a corresponding HTLC-Timeout transactions, as well as a
2635         // timeout-claim of the output that nodes[2] just claimed via success.
2636         check_tx_local_broadcast!(nodes[1], false, commitment_tx[0], chan_2.3);
2637
2638         // Broadcast legit commitment tx from A on B's chain
2639         // Broadcast preimage tx by B on offered output from A commitment tx  on A's chain
2640         let node_a_commitment_tx = get_local_commitment_txn!(nodes[0], chan_1.2);
2641         check_spends!(node_a_commitment_tx[0], chan_1.3);
2642         mine_transaction(&nodes[1], &node_a_commitment_tx[0]);
2643         check_closed_broadcast!(nodes[1], true);
2644         check_added_monitors!(nodes[1], 1);
2645         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
2646         let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap().clone();
2647         assert_eq!(node_txn.len(), 6); // ChannelManager : 3 (commitment tx + HTLC-Sucess * 2), ChannelMonitor : 3 (HTLC-Success, 2* RBF bumps of above HTLC txn)
2648         let commitment_spend =
2649                 if node_txn[0].input[0].previous_output.txid == node_a_commitment_tx[0].txid() {
2650                         check_spends!(node_txn[1], commitment_tx[0]);
2651                         check_spends!(node_txn[2], commitment_tx[0]);
2652                         assert_ne!(node_txn[1].input[0].previous_output.vout, node_txn[2].input[0].previous_output.vout);
2653                         &node_txn[0]
2654                 } else {
2655                         check_spends!(node_txn[0], commitment_tx[0]);
2656                         check_spends!(node_txn[1], commitment_tx[0]);
2657                         assert_ne!(node_txn[0].input[0].previous_output.vout, node_txn[1].input[0].previous_output.vout);
2658                         &node_txn[2]
2659                 };
2660
2661         check_spends!(commitment_spend, node_a_commitment_tx[0]);
2662         assert_eq!(commitment_spend.input.len(), 2);
2663         assert_eq!(commitment_spend.input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
2664         assert_eq!(commitment_spend.input[1].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
2665         assert_eq!(commitment_spend.lock_time, 0);
2666         assert!(commitment_spend.output[0].script_pubkey.is_v0_p2wpkh()); // direct payment
2667         check_spends!(node_txn[3], chan_1.3);
2668         assert_eq!(node_txn[3].input[0].witness.clone().last().unwrap().len(), 71);
2669         check_spends!(node_txn[4], node_txn[3]);
2670         check_spends!(node_txn[5], node_txn[3]);
2671         // We don't bother to check that B can claim the HTLC output on its commitment tx here as
2672         // we already checked the same situation with A.
2673
2674         // Verify that A's ChannelManager is able to extract preimage from preimage tx and generate PaymentSent
2675         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: nodes[0].best_block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42};
2676         connect_block(&nodes[0], &Block { header, txdata: vec![node_a_commitment_tx[0].clone(), commitment_spend.clone()] });
2677         connect_blocks(&nodes[0], TEST_FINAL_CLTV + MIN_CLTV_EXPIRY_DELTA as u32 - 1); // Confirm blocks until the HTLC expires
2678         check_closed_broadcast!(nodes[0], true);
2679         check_added_monitors!(nodes[0], 1);
2680         let events = nodes[0].node.get_and_clear_pending_events();
2681         assert_eq!(events.len(), 3);
2682         let mut first_claimed = false;
2683         for event in events {
2684                 match event {
2685                         Event::PaymentSent { payment_preimage } => {
2686                                 if payment_preimage == our_payment_preimage {
2687                                         assert!(!first_claimed);
2688                                         first_claimed = true;
2689                                 } else {
2690                                         assert_eq!(payment_preimage, our_payment_preimage_2);
2691                                 }
2692                         },
2693                         Event::ChannelClosed { reason: ClosureReason::CommitmentTxConfirmed, .. } => {},
2694                         _ => panic!("Unexpected event"),
2695                 }
2696         }
2697         check_tx_local_broadcast!(nodes[0], true, node_a_commitment_tx[0], chan_1.3);
2698 }
2699
2700 fn do_test_htlc_on_chain_timeout(connect_style: ConnectStyle) {
2701         // Test that in case of a unilateral close onchain, we detect the state of output and
2702         // timeout the HTLC backward accordingly. So here we test that ChannelManager is
2703         // broadcasting the right event to other nodes in payment path.
2704         // A ------------------> B ----------------------> C (timeout)
2705         //    B's commitment tx                 C's commitment tx
2706         //            \                                  \
2707         //         B's HTLC timeout tx               B's timeout tx
2708
2709         let chanmon_cfgs = create_chanmon_cfgs(3);
2710         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
2711         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
2712         let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs);
2713         *nodes[0].connect_style.borrow_mut() = connect_style;
2714         *nodes[1].connect_style.borrow_mut() = connect_style;
2715         *nodes[2].connect_style.borrow_mut() = connect_style;
2716
2717         // Create some intial channels
2718         let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
2719         let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2, InitFeatures::known(), InitFeatures::known());
2720
2721         // Rebalance the network a bit by relaying one payment thorugh all the channels...
2722         send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 8000000);
2723         send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 8000000);
2724
2725         let (_payment_preimage, payment_hash, _payment_secret) = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), 3000000);
2726
2727         // Broadcast legit commitment tx from C on B's chain
2728         let commitment_tx = get_local_commitment_txn!(nodes[2], chan_2.2);
2729         check_spends!(commitment_tx[0], chan_2.3);
2730         nodes[2].node.fail_htlc_backwards(&payment_hash);
2731         check_added_monitors!(nodes[2], 0);
2732         expect_pending_htlcs_forwardable!(nodes[2]);
2733         check_added_monitors!(nodes[2], 1);
2734
2735         let events = nodes[2].node.get_and_clear_pending_msg_events();
2736         assert_eq!(events.len(), 1);
2737         match events[0] {
2738                 MessageSendEvent::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, .. } } => {
2739                         assert!(update_add_htlcs.is_empty());
2740                         assert!(!update_fail_htlcs.is_empty());
2741                         assert!(update_fulfill_htlcs.is_empty());
2742                         assert!(update_fail_malformed_htlcs.is_empty());
2743                         assert_eq!(nodes[1].node.get_our_node_id(), *node_id);
2744                 },
2745                 _ => panic!("Unexpected event"),
2746         };
2747         mine_transaction(&nodes[2], &commitment_tx[0]);
2748         check_closed_broadcast!(nodes[2], true);
2749         check_added_monitors!(nodes[2], 1);
2750         check_closed_event!(nodes[2], 1, ClosureReason::CommitmentTxConfirmed);
2751         let node_txn = nodes[2].tx_broadcaster.txn_broadcasted.lock().unwrap().clone(); // ChannelManager : 1 (commitment tx)
2752         assert_eq!(node_txn.len(), 1);
2753         check_spends!(node_txn[0], chan_2.3);
2754         assert_eq!(node_txn[0].input[0].witness.last().unwrap().len(), 71);
2755
2756         // Broadcast timeout transaction by B on received output from C's commitment tx on B's chain
2757         // Verify that B's ChannelManager is able to detect that HTLC is timeout by its own tx and react backward in consequence
2758         connect_blocks(&nodes[1], 200 - nodes[2].best_block_info().1);
2759         mine_transaction(&nodes[1], &commitment_tx[0]);
2760         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
2761         let timeout_tx;
2762         {
2763                 let mut node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
2764                 assert_eq!(node_txn.len(), 5); // ChannelManager : 2 (commitment tx, HTLC-Timeout tx), ChannelMonitor : 2 (local commitment tx + HTLC-timeout), 1 timeout tx
2765                 assert_eq!(node_txn[0], node_txn[3]);
2766                 assert_eq!(node_txn[1], node_txn[4]);
2767
2768                 check_spends!(node_txn[2], commitment_tx[0]);
2769                 assert_eq!(node_txn[2].clone().input[0].witness.last().unwrap().len(), ACCEPTED_HTLC_SCRIPT_WEIGHT);
2770
2771                 check_spends!(node_txn[0], chan_2.3);
2772                 check_spends!(node_txn[1], node_txn[0]);
2773                 assert_eq!(node_txn[0].clone().input[0].witness.last().unwrap().len(), 71);
2774                 assert_eq!(node_txn[1].clone().input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
2775
2776                 timeout_tx = node_txn[2].clone();
2777                 node_txn.clear();
2778         }
2779
2780         mine_transaction(&nodes[1], &timeout_tx);
2781         check_added_monitors!(nodes[1], 1);
2782         check_closed_broadcast!(nodes[1], true);
2783         {
2784                 // B will rebroadcast a fee-bumped timeout transaction here.
2785                 let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap().split_off(0);
2786                 assert_eq!(node_txn.len(), 1);
2787                 check_spends!(node_txn[0], commitment_tx[0]);
2788         }
2789
2790         connect_blocks(&nodes[1], ANTI_REORG_DELAY - 1);
2791         {
2792                 // B may rebroadcast its own holder commitment transaction here, as a safeguard against
2793                 // some incredibly unlikely partial-eclipse-attack scenarios. That said, because the
2794                 // original commitment_tx[0] (also spending chan_2.3) has reached ANTI_REORG_DELAY B really
2795                 // shouldn't broadcast anything here, and in some connect style scenarios we do not.
2796                 let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap().split_off(0);
2797                 if node_txn.len() == 1 {
2798                         check_spends!(node_txn[0], chan_2.3);
2799                 } else {
2800                         assert_eq!(node_txn.len(), 0);
2801                 }
2802         }
2803
2804         expect_pending_htlcs_forwardable!(nodes[1]);
2805         check_added_monitors!(nodes[1], 1);
2806         let events = nodes[1].node.get_and_clear_pending_msg_events();
2807         assert_eq!(events.len(), 1);
2808         match events[0] {
2809                 MessageSendEvent::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fail_htlcs, ref update_fulfill_htlcs, ref update_fail_malformed_htlcs, .. } } => {
2810                         assert!(update_add_htlcs.is_empty());
2811                         assert!(!update_fail_htlcs.is_empty());
2812                         assert!(update_fulfill_htlcs.is_empty());
2813                         assert!(update_fail_malformed_htlcs.is_empty());
2814                         assert_eq!(nodes[0].node.get_our_node_id(), *node_id);
2815                 },
2816                 _ => panic!("Unexpected event"),
2817         };
2818
2819         // Broadcast legit commitment tx from B on A's chain
2820         let commitment_tx = get_local_commitment_txn!(nodes[1], chan_1.2);
2821         check_spends!(commitment_tx[0], chan_1.3);
2822
2823         mine_transaction(&nodes[0], &commitment_tx[0]);
2824         connect_blocks(&nodes[0], TEST_FINAL_CLTV + MIN_CLTV_EXPIRY_DELTA as u32 - 1); // Confirm blocks until the HTLC expires
2825
2826         check_closed_broadcast!(nodes[0], true);
2827         check_added_monitors!(nodes[0], 1);
2828         check_closed_event!(nodes[0], 1, ClosureReason::CommitmentTxConfirmed);
2829         let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().clone(); // ChannelManager : 1 commitment tx, ChannelMonitor : 1 timeout tx
2830         assert_eq!(node_txn.len(), 2);
2831         check_spends!(node_txn[0], chan_1.3);
2832         assert_eq!(node_txn[0].clone().input[0].witness.last().unwrap().len(), 71);
2833         check_spends!(node_txn[1], commitment_tx[0]);
2834         assert_eq!(node_txn[1].clone().input[0].witness.last().unwrap().len(), ACCEPTED_HTLC_SCRIPT_WEIGHT);
2835 }
2836
2837 #[test]
2838 fn test_htlc_on_chain_timeout() {
2839         do_test_htlc_on_chain_timeout(ConnectStyle::BestBlockFirstSkippingBlocks);
2840         do_test_htlc_on_chain_timeout(ConnectStyle::TransactionsFirstSkippingBlocks);
2841         do_test_htlc_on_chain_timeout(ConnectStyle::FullBlockViaListen);
2842 }
2843
2844 #[test]
2845 fn test_simple_commitment_revoked_fail_backward() {
2846         // Test that in case of a revoked commitment tx, we detect the resolution of output by justice tx
2847         // and fail backward accordingly.
2848
2849         let chanmon_cfgs = create_chanmon_cfgs(3);
2850         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
2851         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
2852         let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
2853
2854         // Create some initial channels
2855         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
2856         let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2, InitFeatures::known(), InitFeatures::known());
2857
2858         let (payment_preimage, _payment_hash, _payment_secret) = route_payment(&nodes[0], &[&nodes[1], &nodes[2]], 3000000);
2859         // Get the will-be-revoked local txn from nodes[2]
2860         let revoked_local_txn = get_local_commitment_txn!(nodes[2], chan_2.2);
2861         // Revoke the old state
2862         claim_payment(&nodes[0], &[&nodes[1], &nodes[2]], payment_preimage);
2863
2864         let (_, payment_hash, _) = route_payment(&nodes[0], &[&nodes[1], &nodes[2]], 3000000);
2865
2866         mine_transaction(&nodes[1], &revoked_local_txn[0]);
2867         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
2868         connect_blocks(&nodes[1], ANTI_REORG_DELAY - 1);
2869         check_added_monitors!(nodes[1], 1);
2870         check_closed_broadcast!(nodes[1], true);
2871
2872         expect_pending_htlcs_forwardable!(nodes[1]);
2873         check_added_monitors!(nodes[1], 1);
2874         let events = nodes[1].node.get_and_clear_pending_msg_events();
2875         assert_eq!(events.len(), 1);
2876         match events[0] {
2877                 MessageSendEvent::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fail_htlcs, ref update_fulfill_htlcs, ref update_fail_malformed_htlcs, ref commitment_signed, .. } } => {
2878                         assert!(update_add_htlcs.is_empty());
2879                         assert_eq!(update_fail_htlcs.len(), 1);
2880                         assert!(update_fulfill_htlcs.is_empty());
2881                         assert!(update_fail_malformed_htlcs.is_empty());
2882                         assert_eq!(nodes[0].node.get_our_node_id(), *node_id);
2883
2884                         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &update_fail_htlcs[0]);
2885                         commitment_signed_dance!(nodes[0], nodes[1], commitment_signed, false, true);
2886                         expect_payment_failed_with_update!(nodes[0], payment_hash, false, chan_2.0.contents.short_channel_id, true);
2887                 },
2888                 _ => panic!("Unexpected event"),
2889         }
2890 }
2891
2892 fn do_test_commitment_revoked_fail_backward_exhaustive(deliver_bs_raa: bool, use_dust: bool, no_to_remote: bool) {
2893         // Test that if our counterparty broadcasts a revoked commitment transaction we fail all
2894         // pending HTLCs on that channel backwards even if the HTLCs aren't present in our latest
2895         // commitment transaction anymore.
2896         // To do this, we have the peer which will broadcast a revoked commitment transaction send
2897         // a number of update_fail/commitment_signed updates without ever sending the RAA in
2898         // response to our commitment_signed. This is somewhat misbehavior-y, though not
2899         // technically disallowed and we should probably handle it reasonably.
2900         // Note that this is pretty exhaustive as an outbound HTLC which we haven't yet
2901         // failed/fulfilled backwards must be in at least one of the latest two remote commitment
2902         // transactions:
2903         // * Once we move it out of our holding cell/add it, we will immediately include it in a
2904         //   commitment_signed (implying it will be in the latest remote commitment transaction).
2905         // * Once they remove it, we will send a (the first) commitment_signed without the HTLC,
2906         //   and once they revoke the previous commitment transaction (allowing us to send a new
2907         //   commitment_signed) we will be free to fail/fulfill the HTLC backwards.
2908         let chanmon_cfgs = create_chanmon_cfgs(3);
2909         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
2910         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
2911         let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs);
2912
2913         // Create some initial channels
2914         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
2915         let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2, InitFeatures::known(), InitFeatures::known());
2916
2917         let (payment_preimage, _payment_hash, _payment_secret) = route_payment(&nodes[0], &[&nodes[1], &nodes[2]], if no_to_remote { 10_000 } else { 3_000_000 });
2918         // Get the will-be-revoked local txn from nodes[2]
2919         let revoked_local_txn = get_local_commitment_txn!(nodes[2], chan_2.2);
2920         assert_eq!(revoked_local_txn[0].output.len(), if no_to_remote { 1 } else { 2 });
2921         // Revoke the old state
2922         claim_payment(&nodes[0], &[&nodes[1], &nodes[2]], payment_preimage);
2923
2924         let value = if use_dust {
2925                 // The dust limit applied to HTLC outputs considers the fee of the HTLC transaction as
2926                 // well, so HTLCs at exactly the dust limit will not be included in commitment txn.
2927                 nodes[2].node.channel_state.lock().unwrap().by_id.get(&chan_2.2).unwrap().holder_dust_limit_satoshis * 1000
2928         } else { 3000000 };
2929
2930         let (_, first_payment_hash, _) = route_payment(&nodes[0], &[&nodes[1], &nodes[2]], value);
2931         let (_, second_payment_hash, _) = route_payment(&nodes[0], &[&nodes[1], &nodes[2]], value);
2932         let (_, third_payment_hash, _) = route_payment(&nodes[0], &[&nodes[1], &nodes[2]], value);
2933
2934         assert!(nodes[2].node.fail_htlc_backwards(&first_payment_hash));
2935         expect_pending_htlcs_forwardable!(nodes[2]);
2936         check_added_monitors!(nodes[2], 1);
2937         let updates = get_htlc_update_msgs!(nodes[2], nodes[1].node.get_our_node_id());
2938         assert!(updates.update_add_htlcs.is_empty());
2939         assert!(updates.update_fulfill_htlcs.is_empty());
2940         assert!(updates.update_fail_malformed_htlcs.is_empty());
2941         assert_eq!(updates.update_fail_htlcs.len(), 1);
2942         assert!(updates.update_fee.is_none());
2943         nodes[1].node.handle_update_fail_htlc(&nodes[2].node.get_our_node_id(), &updates.update_fail_htlcs[0]);
2944         let bs_raa = commitment_signed_dance!(nodes[1], nodes[2], updates.commitment_signed, false, true, false, true);
2945         // Drop the last RAA from 3 -> 2
2946
2947         assert!(nodes[2].node.fail_htlc_backwards(&second_payment_hash));
2948         expect_pending_htlcs_forwardable!(nodes[2]);
2949         check_added_monitors!(nodes[2], 1);
2950         let updates = get_htlc_update_msgs!(nodes[2], nodes[1].node.get_our_node_id());
2951         assert!(updates.update_add_htlcs.is_empty());
2952         assert!(updates.update_fulfill_htlcs.is_empty());
2953         assert!(updates.update_fail_malformed_htlcs.is_empty());
2954         assert_eq!(updates.update_fail_htlcs.len(), 1);
2955         assert!(updates.update_fee.is_none());
2956         nodes[1].node.handle_update_fail_htlc(&nodes[2].node.get_our_node_id(), &updates.update_fail_htlcs[0]);
2957         nodes[1].node.handle_commitment_signed(&nodes[2].node.get_our_node_id(), &updates.commitment_signed);
2958         check_added_monitors!(nodes[1], 1);
2959         // Note that nodes[1] is in AwaitingRAA, so won't send a CS
2960         let as_raa = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[2].node.get_our_node_id());
2961         nodes[2].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &as_raa);
2962         check_added_monitors!(nodes[2], 1);
2963
2964         assert!(nodes[2].node.fail_htlc_backwards(&third_payment_hash));
2965         expect_pending_htlcs_forwardable!(nodes[2]);
2966         check_added_monitors!(nodes[2], 1);
2967         let updates = get_htlc_update_msgs!(nodes[2], nodes[1].node.get_our_node_id());
2968         assert!(updates.update_add_htlcs.is_empty());
2969         assert!(updates.update_fulfill_htlcs.is_empty());
2970         assert!(updates.update_fail_malformed_htlcs.is_empty());
2971         assert_eq!(updates.update_fail_htlcs.len(), 1);
2972         assert!(updates.update_fee.is_none());
2973         nodes[1].node.handle_update_fail_htlc(&nodes[2].node.get_our_node_id(), &updates.update_fail_htlcs[0]);
2974         // At this point first_payment_hash has dropped out of the latest two commitment
2975         // transactions that nodes[1] is tracking...
2976         nodes[1].node.handle_commitment_signed(&nodes[2].node.get_our_node_id(), &updates.commitment_signed);
2977         check_added_monitors!(nodes[1], 1);
2978         // Note that nodes[1] is (still) in AwaitingRAA, so won't send a CS
2979         let as_raa = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[2].node.get_our_node_id());
2980         nodes[2].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &as_raa);
2981         check_added_monitors!(nodes[2], 1);
2982
2983         // Add a fourth HTLC, this one will get sequestered away in nodes[1]'s holding cell waiting
2984         // on nodes[2]'s RAA.
2985         let (_, fourth_payment_hash, fourth_payment_secret) = get_payment_preimage_hash!(nodes[2]);
2986         let net_graph_msg_handler = &nodes[1].net_graph_msg_handler;
2987         let logger = test_utils::TestLogger::new();
2988         let route = get_route(&nodes[1].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[2].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 1000000, TEST_FINAL_CLTV, &logger).unwrap();
2989         nodes[1].node.send_payment(&route, fourth_payment_hash, &Some(fourth_payment_secret)).unwrap();
2990         assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
2991         assert!(nodes[1].node.get_and_clear_pending_events().is_empty());
2992         check_added_monitors!(nodes[1], 0);
2993
2994         if deliver_bs_raa {
2995                 nodes[1].node.handle_revoke_and_ack(&nodes[2].node.get_our_node_id(), &bs_raa);
2996                 // One monitor for the new revocation preimage, no second on as we won't generate a new
2997                 // commitment transaction for nodes[0] until process_pending_htlc_forwards().
2998                 check_added_monitors!(nodes[1], 1);
2999                 let events = nodes[1].node.get_and_clear_pending_events();
3000                 assert_eq!(events.len(), 1);
3001                 match events[0] {
3002                         Event::PendingHTLCsForwardable { .. } => { },
3003                         _ => panic!("Unexpected event"),
3004                 };
3005                 // Deliberately don't process the pending fail-back so they all fail back at once after
3006                 // block connection just like the !deliver_bs_raa case
3007         }
3008
3009         let mut failed_htlcs = HashSet::new();
3010         assert!(nodes[1].node.get_and_clear_pending_events().is_empty());
3011
3012         mine_transaction(&nodes[1], &revoked_local_txn[0]);
3013         check_added_monitors!(nodes[1], 1);
3014         connect_blocks(&nodes[1], ANTI_REORG_DELAY - 1);
3015
3016         let events = nodes[1].node.get_and_clear_pending_events();
3017         assert_eq!(events.len(), if deliver_bs_raa { 2 } else { 3 });
3018         match events[0] {
3019                 Event::ChannelClosed { reason: ClosureReason::CommitmentTxConfirmed, .. } => { },
3020                 _ => panic!("Unexepected event"),
3021         }
3022         match events[1] {
3023                 Event::PaymentPathFailed { ref payment_hash, .. } => {
3024                         assert_eq!(*payment_hash, fourth_payment_hash);
3025                 },
3026                 _ => panic!("Unexpected event"),
3027         }
3028         if !deliver_bs_raa {
3029                 match events[2] {
3030                         Event::PendingHTLCsForwardable { .. } => { },
3031                         _ => panic!("Unexpected event"),
3032                 };
3033         }
3034         nodes[1].node.process_pending_htlc_forwards();
3035         check_added_monitors!(nodes[1], 1);
3036
3037         let events = nodes[1].node.get_and_clear_pending_msg_events();
3038         assert_eq!(events.len(), if deliver_bs_raa { 4 } else { 3 });
3039         match events[if deliver_bs_raa { 1 } else { 0 }] {
3040                 MessageSendEvent::BroadcastChannelUpdate { msg: msgs::ChannelUpdate { .. } } => {},
3041                 _ => panic!("Unexpected event"),
3042         }
3043         match events[if deliver_bs_raa { 2 } else { 1 }] {
3044                 MessageSendEvent::HandleError { action: ErrorAction::SendErrorMessage { msg: msgs::ErrorMessage { channel_id, ref data } }, node_id: _ } => {
3045                         assert_eq!(channel_id, chan_2.2);
3046                         assert_eq!(data.as_str(), "Commitment or closing transaction was confirmed on chain.");
3047                 },
3048                 _ => panic!("Unexpected event"),
3049         }
3050         if deliver_bs_raa {
3051                 match events[0] {
3052                         MessageSendEvent::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fail_htlcs, ref update_fulfill_htlcs, ref update_fail_malformed_htlcs, .. } } => {
3053                                 assert_eq!(nodes[2].node.get_our_node_id(), *node_id);
3054                                 assert_eq!(update_add_htlcs.len(), 1);
3055                                 assert!(update_fulfill_htlcs.is_empty());
3056                                 assert!(update_fail_htlcs.is_empty());
3057                                 assert!(update_fail_malformed_htlcs.is_empty());
3058                         },
3059                         _ => panic!("Unexpected event"),
3060                 }
3061         }
3062         match events[if deliver_bs_raa { 3 } else { 2 }] {
3063                 MessageSendEvent::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fail_htlcs, ref update_fulfill_htlcs, ref update_fail_malformed_htlcs, ref commitment_signed, .. } } => {
3064                         assert!(update_add_htlcs.is_empty());
3065                         assert_eq!(update_fail_htlcs.len(), 3);
3066                         assert!(update_fulfill_htlcs.is_empty());
3067                         assert!(update_fail_malformed_htlcs.is_empty());
3068                         assert_eq!(nodes[0].node.get_our_node_id(), *node_id);
3069
3070                         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &update_fail_htlcs[0]);
3071                         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &update_fail_htlcs[1]);
3072                         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &update_fail_htlcs[2]);
3073
3074                         commitment_signed_dance!(nodes[0], nodes[1], commitment_signed, false, true);
3075
3076                         let events = nodes[0].node.get_and_clear_pending_events();
3077                         assert_eq!(events.len(), 3);
3078                         match events[0] {
3079                                 Event::PaymentPathFailed { ref payment_hash, rejected_by_dest: _, ref network_update, .. } => {
3080                                         assert!(failed_htlcs.insert(payment_hash.0));
3081                                         // If we delivered B's RAA we got an unknown preimage error, not something
3082                                         // that we should update our routing table for.
3083                                         if !deliver_bs_raa {
3084                                                 assert!(network_update.is_some());
3085                                         }
3086                                 },
3087                                 _ => panic!("Unexpected event"),
3088                         }
3089                         match events[1] {
3090                                 Event::PaymentPathFailed { ref payment_hash, rejected_by_dest: _, ref network_update, .. } => {
3091                                         assert!(failed_htlcs.insert(payment_hash.0));
3092                                         assert!(network_update.is_some());
3093                                 },
3094                                 _ => panic!("Unexpected event"),
3095                         }
3096                         match events[2] {
3097                                 Event::PaymentPathFailed { ref payment_hash, rejected_by_dest: _, ref network_update, .. } => {
3098                                         assert!(failed_htlcs.insert(payment_hash.0));
3099                                         assert!(network_update.is_some());
3100                                 },
3101                                 _ => panic!("Unexpected event"),
3102                         }
3103                 },
3104                 _ => panic!("Unexpected event"),
3105         }
3106
3107         assert!(failed_htlcs.contains(&first_payment_hash.0));
3108         assert!(failed_htlcs.contains(&second_payment_hash.0));
3109         assert!(failed_htlcs.contains(&third_payment_hash.0));
3110 }
3111
3112 #[test]
3113 fn test_commitment_revoked_fail_backward_exhaustive_a() {
3114         do_test_commitment_revoked_fail_backward_exhaustive(false, true, false);
3115         do_test_commitment_revoked_fail_backward_exhaustive(true, true, false);
3116         do_test_commitment_revoked_fail_backward_exhaustive(false, false, false);
3117         do_test_commitment_revoked_fail_backward_exhaustive(true, false, false);
3118 }
3119
3120 #[test]
3121 fn test_commitment_revoked_fail_backward_exhaustive_b() {
3122         do_test_commitment_revoked_fail_backward_exhaustive(false, true, true);
3123         do_test_commitment_revoked_fail_backward_exhaustive(true, true, true);
3124         do_test_commitment_revoked_fail_backward_exhaustive(false, false, true);
3125         do_test_commitment_revoked_fail_backward_exhaustive(true, false, true);
3126 }
3127
3128 #[test]
3129 fn fail_backward_pending_htlc_upon_channel_failure() {
3130         let chanmon_cfgs = create_chanmon_cfgs(2);
3131         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
3132         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
3133         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
3134         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1_000_000, 500_000_000, InitFeatures::known(), InitFeatures::known());
3135         let logger = test_utils::TestLogger::new();
3136
3137         // Alice -> Bob: Route a payment but without Bob sending revoke_and_ack.
3138         {
3139                 let (_, payment_hash, payment_secret) = get_payment_preimage_hash!(nodes[1]);
3140                 let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
3141                 let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 50_000, TEST_FINAL_CLTV, &logger).unwrap();
3142                 nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap();
3143                 check_added_monitors!(nodes[0], 1);
3144
3145                 let payment_event = {
3146                         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
3147                         assert_eq!(events.len(), 1);
3148                         SendEvent::from_event(events.remove(0))
3149                 };
3150                 assert_eq!(payment_event.node_id, nodes[1].node.get_our_node_id());
3151                 assert_eq!(payment_event.msgs.len(), 1);
3152         }
3153
3154         // Alice -> Bob: Route another payment but now Alice waits for Bob's earlier revoke_and_ack.
3155         let (_, failed_payment_hash, failed_payment_secret) = get_payment_preimage_hash!(nodes[1]);
3156         {
3157                 let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
3158                 let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 50_000, TEST_FINAL_CLTV, &logger).unwrap();
3159                 nodes[0].node.send_payment(&route, failed_payment_hash, &Some(failed_payment_secret)).unwrap();
3160                 check_added_monitors!(nodes[0], 0);
3161
3162                 assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
3163         }
3164
3165         // Alice <- Bob: Send a malformed update_add_htlc so Alice fails the channel.
3166         {
3167                 let (_, payment_hash, payment_secret) = get_payment_preimage_hash!(nodes[0]);
3168
3169                 let secp_ctx = Secp256k1::new();
3170                 let session_priv = SecretKey::from_slice(&[42; 32]).unwrap();
3171                 let current_height = nodes[1].node.best_block.read().unwrap().height() + 1;
3172                 let net_graph_msg_handler = &nodes[1].net_graph_msg_handler;
3173                 let route = get_route(&nodes[1].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[0].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 50_000, TEST_FINAL_CLTV, &logger).unwrap();
3174                 let (onion_payloads, _amount_msat, cltv_expiry) = onion_utils::build_onion_payloads(&route.paths[0], 50_000, &Some(payment_secret), current_height, &None).unwrap();
3175                 let onion_keys = onion_utils::construct_onion_keys(&secp_ctx, &route.paths[0], &session_priv).unwrap();
3176                 let onion_routing_packet = onion_utils::construct_onion_packet(onion_payloads, onion_keys, [0; 32], &payment_hash);
3177
3178                 // Send a 0-msat update_add_htlc to fail the channel.
3179                 let update_add_htlc = msgs::UpdateAddHTLC {
3180                         channel_id: chan.2,
3181                         htlc_id: 0,
3182                         amount_msat: 0,
3183                         payment_hash,
3184                         cltv_expiry,
3185                         onion_routing_packet,
3186                 };
3187                 nodes[0].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &update_add_htlc);
3188         }
3189         let events = nodes[0].node.get_and_clear_pending_events();
3190         assert_eq!(events.len(), 2);
3191         // Check that Alice fails backward the pending HTLC from the second payment.
3192         match events[0] {
3193                 Event::PaymentPathFailed { payment_hash, .. } => {
3194                         assert_eq!(payment_hash, failed_payment_hash);
3195                 },
3196                 _ => panic!("Unexpected event"),
3197         }
3198         match events[1] {
3199                 Event::ChannelClosed { reason: ClosureReason::ProcessingError { ref err }, .. } => {
3200                         assert_eq!(err, "Remote side tried to send a 0-msat HTLC");
3201                 },
3202                 _ => panic!("Unexpected event {:?}", events[1]),
3203         }
3204         check_closed_broadcast!(nodes[0], true);
3205         check_added_monitors!(nodes[0], 1);
3206 }
3207
3208 #[test]
3209 fn test_htlc_ignore_latest_remote_commitment() {
3210         // Test that HTLC transactions spending the latest remote commitment transaction are simply
3211         // ignored if we cannot claim them. This originally tickled an invalid unwrap().
3212         let chanmon_cfgs = create_chanmon_cfgs(2);
3213         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
3214         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
3215         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
3216         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
3217
3218         route_payment(&nodes[0], &[&nodes[1]], 10000000);
3219         nodes[0].node.force_close_channel(&nodes[0].node.list_channels()[0].channel_id).unwrap();
3220         connect_blocks(&nodes[0], TEST_FINAL_CLTV + LATENCY_GRACE_PERIOD_BLOCKS + 1);
3221         check_closed_broadcast!(nodes[0], true);
3222         check_added_monitors!(nodes[0], 1);
3223         check_closed_event!(nodes[0], 1, ClosureReason::HolderForceClosed);
3224
3225         let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
3226         assert_eq!(node_txn.len(), 3);
3227         assert_eq!(node_txn[0], node_txn[1]);
3228
3229         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: nodes[1].best_block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3230         connect_block(&nodes[1], &Block { header, txdata: vec![node_txn[0].clone(), node_txn[1].clone()]});
3231         check_closed_broadcast!(nodes[1], true);
3232         check_added_monitors!(nodes[1], 1);
3233         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
3234
3235         // Duplicate the connect_block call since this may happen due to other listeners
3236         // registering new transactions
3237         header.prev_blockhash = header.block_hash();
3238         connect_block(&nodes[1], &Block { header, txdata: vec![node_txn[0].clone(), node_txn[2].clone()]});
3239 }
3240
3241 #[test]
3242 fn test_force_close_fail_back() {
3243         // Check which HTLCs are failed-backwards on channel force-closure
3244         let chanmon_cfgs = create_chanmon_cfgs(3);
3245         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
3246         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
3247         let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs);
3248         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
3249         create_announced_chan_between_nodes(&nodes, 1, 2, InitFeatures::known(), InitFeatures::known());
3250         let logger = test_utils::TestLogger::new();
3251
3252         let (our_payment_preimage, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[2]);
3253
3254         let mut payment_event = {
3255                 let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
3256                 let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[2].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 1000000, 42, &logger).unwrap();
3257                 nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
3258                 check_added_monitors!(nodes[0], 1);
3259
3260                 let mut events = nodes[0].node.get_and_clear_pending_msg_events();
3261                 assert_eq!(events.len(), 1);
3262                 SendEvent::from_event(events.remove(0))
3263         };
3264
3265         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
3266         commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
3267
3268         expect_pending_htlcs_forwardable!(nodes[1]);
3269
3270         let mut events_2 = nodes[1].node.get_and_clear_pending_msg_events();
3271         assert_eq!(events_2.len(), 1);
3272         payment_event = SendEvent::from_event(events_2.remove(0));
3273         assert_eq!(payment_event.msgs.len(), 1);
3274
3275         check_added_monitors!(nodes[1], 1);
3276         nodes[2].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &payment_event.msgs[0]);
3277         nodes[2].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &payment_event.commitment_msg);
3278         check_added_monitors!(nodes[2], 1);
3279         let (_, _) = get_revoke_commit_msgs!(nodes[2], nodes[1].node.get_our_node_id());
3280
3281         // nodes[2] now has the latest commitment transaction, but hasn't revoked its previous
3282         // state or updated nodes[1]' state. Now force-close and broadcast that commitment/HTLC
3283         // transaction and ensure nodes[1] doesn't fail-backwards (this was originally a bug!).
3284
3285         nodes[2].node.force_close_channel(&payment_event.commitment_msg.channel_id).unwrap();
3286         check_closed_broadcast!(nodes[2], true);
3287         check_added_monitors!(nodes[2], 1);
3288         check_closed_event!(nodes[2], 1, ClosureReason::HolderForceClosed);
3289         let tx = {
3290                 let mut node_txn = nodes[2].tx_broadcaster.txn_broadcasted.lock().unwrap();
3291                 // Note that we don't bother broadcasting the HTLC-Success transaction here as we don't
3292                 // have a use for it unless nodes[2] learns the preimage somehow, the funds will go
3293                 // back to nodes[1] upon timeout otherwise.
3294                 assert_eq!(node_txn.len(), 1);
3295                 node_txn.remove(0)
3296         };
3297
3298         mine_transaction(&nodes[1], &tx);
3299
3300         // Note no UpdateHTLCs event here from nodes[1] to nodes[0]!
3301         check_closed_broadcast!(nodes[1], true);
3302         check_added_monitors!(nodes[1], 1);
3303         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
3304
3305         // Now check that if we add the preimage to ChannelMonitor it broadcasts our HTLC-Success..
3306         {
3307                 let mut monitors = nodes[2].chain_monitor.chain_monitor.monitors.read().unwrap();
3308                 monitors.get(&OutPoint{ txid: Txid::from_slice(&payment_event.commitment_msg.channel_id[..]).unwrap(), index: 0 }).unwrap()
3309                         .provide_payment_preimage(&our_payment_hash, &our_payment_preimage, &node_cfgs[2].tx_broadcaster, &node_cfgs[2].fee_estimator, &&logger);
3310         }
3311         mine_transaction(&nodes[2], &tx);
3312         let node_txn = nodes[2].tx_broadcaster.txn_broadcasted.lock().unwrap();
3313         assert_eq!(node_txn.len(), 1);
3314         assert_eq!(node_txn[0].input.len(), 1);
3315         assert_eq!(node_txn[0].input[0].previous_output.txid, tx.txid());
3316         assert_eq!(node_txn[0].lock_time, 0); // Must be an HTLC-Success
3317         assert_eq!(node_txn[0].input[0].witness.len(), 5); // Must be an HTLC-Success
3318
3319         check_spends!(node_txn[0], tx);
3320 }
3321
3322 #[test]
3323 fn test_dup_events_on_peer_disconnect() {
3324         // Test that if we receive a duplicative update_fulfill_htlc message after a reconnect we do
3325         // not generate a corresponding duplicative PaymentSent event. This did not use to be the case
3326         // as we used to generate the event immediately upon receipt of the payment preimage in the
3327         // update_fulfill_htlc message.
3328
3329         let chanmon_cfgs = create_chanmon_cfgs(2);
3330         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
3331         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
3332         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
3333         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
3334
3335         let payment_preimage = route_payment(&nodes[0], &[&nodes[1]], 1000000).0;
3336
3337         assert!(nodes[1].node.claim_funds(payment_preimage));
3338         check_added_monitors!(nodes[1], 1);
3339         let claim_msgs = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
3340         nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &claim_msgs.update_fulfill_htlcs[0]);
3341         expect_payment_sent!(nodes[0], payment_preimage);
3342
3343         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
3344         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
3345
3346         reconnect_nodes(&nodes[0], &nodes[1], (false, false), (0, 0), (1, 0), (0, 0), (0, 0), (0, 0), (false, false));
3347         assert!(nodes[0].node.get_and_clear_pending_events().is_empty());
3348 }
3349
3350 #[test]
3351 fn test_simple_peer_disconnect() {
3352         // Test that we can reconnect when there are no lost messages
3353         let chanmon_cfgs = create_chanmon_cfgs(3);
3354         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
3355         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
3356         let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
3357         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
3358         create_announced_chan_between_nodes(&nodes, 1, 2, InitFeatures::known(), InitFeatures::known());
3359
3360         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
3361         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
3362         reconnect_nodes(&nodes[0], &nodes[1], (true, true), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
3363
3364         let payment_preimage_1 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).0;
3365         let payment_hash_2 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).1;
3366         fail_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), payment_hash_2);
3367         claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), payment_preimage_1);
3368
3369         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
3370         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
3371         reconnect_nodes(&nodes[0], &nodes[1], (false, false), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
3372
3373         let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).0;
3374         let payment_preimage_4 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).0;
3375         let payment_hash_5 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).1;
3376         let payment_hash_6 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).1;
3377
3378         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
3379         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
3380
3381         claim_payment_along_route(&nodes[0], &[&[&nodes[1], &nodes[2]]], true, payment_preimage_3);
3382         fail_payment_along_route(&nodes[0], &[&[&nodes[1], &nodes[2]]], true, payment_hash_5);
3383
3384         reconnect_nodes(&nodes[0], &nodes[1], (false, false), (0, 0), (0, 0), (0, 0), (1, 0), (1, 0), (false, false));
3385         {
3386                 let events = nodes[0].node.get_and_clear_pending_events();
3387                 assert_eq!(events.len(), 2);
3388                 match events[0] {
3389                         Event::PaymentSent { payment_preimage } => {
3390                                 assert_eq!(payment_preimage, payment_preimage_3);
3391                         },
3392                         _ => panic!("Unexpected event"),
3393                 }
3394                 match events[1] {
3395                         Event::PaymentPathFailed { payment_hash, rejected_by_dest, .. } => {
3396                                 assert_eq!(payment_hash, payment_hash_5);
3397                                 assert!(rejected_by_dest);
3398                         },
3399                         _ => panic!("Unexpected event"),
3400                 }
3401         }
3402
3403         claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), payment_preimage_4);
3404         fail_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), payment_hash_6);
3405 }
3406
3407 fn do_test_drop_messages_peer_disconnect(messages_delivered: u8, simulate_broken_lnd: bool) {
3408         // Test that we can reconnect when in-flight HTLC updates get dropped
3409         let chanmon_cfgs = create_chanmon_cfgs(2);
3410         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
3411         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
3412         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
3413
3414         let mut as_funding_locked = None;
3415         if messages_delivered == 0 {
3416                 let (funding_locked, _, _) = create_chan_between_nodes_with_value_a(&nodes[0], &nodes[1], 100000, 10001, InitFeatures::known(), InitFeatures::known());
3417                 as_funding_locked = Some(funding_locked);
3418                 // nodes[1] doesn't receive the funding_locked message (it'll be re-sent on reconnect)
3419                 // Note that we store it so that if we're running with `simulate_broken_lnd` we can deliver
3420                 // it before the channel_reestablish message.
3421         } else {
3422                 create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
3423         }
3424
3425         let (payment_preimage_1, payment_hash_1, payment_secret_1) = get_payment_preimage_hash!(nodes[1]);
3426
3427         let logger = test_utils::TestLogger::new();
3428         let payment_event = {
3429                 let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
3430                 let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph,
3431                         &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), Some(&nodes[0].node.list_usable_channels().iter().collect::<Vec<_>>()),
3432                         &Vec::new(), 1000000, TEST_FINAL_CLTV, &logger).unwrap();
3433                 nodes[0].node.send_payment(&route, payment_hash_1, &Some(payment_secret_1)).unwrap();
3434                 check_added_monitors!(nodes[0], 1);
3435
3436                 let mut events = nodes[0].node.get_and_clear_pending_msg_events();
3437                 assert_eq!(events.len(), 1);
3438                 SendEvent::from_event(events.remove(0))
3439         };
3440         assert_eq!(nodes[1].node.get_our_node_id(), payment_event.node_id);
3441
3442         if messages_delivered < 2 {
3443                 // Drop the payment_event messages, and let them get re-generated in reconnect_nodes!
3444         } else {
3445                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
3446                 if messages_delivered >= 3 {
3447                         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &payment_event.commitment_msg);
3448                         check_added_monitors!(nodes[1], 1);
3449                         let (bs_revoke_and_ack, bs_commitment_signed) = get_revoke_commit_msgs!(nodes[1], nodes[0].node.get_our_node_id());
3450
3451                         if messages_delivered >= 4 {
3452                                 nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_revoke_and_ack);
3453                                 assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
3454                                 check_added_monitors!(nodes[0], 1);
3455
3456                                 if messages_delivered >= 5 {
3457                                         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &bs_commitment_signed);
3458                                         let as_revoke_and_ack = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
3459                                         // No commitment_signed so get_event_msg's assert(len == 1) passes
3460                                         check_added_monitors!(nodes[0], 1);
3461
3462                                         if messages_delivered >= 6 {
3463                                                 nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_revoke_and_ack);
3464                                                 assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
3465                                                 check_added_monitors!(nodes[1], 1);
3466                                         }
3467                                 }
3468                         }
3469                 }
3470         }
3471
3472         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
3473         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
3474         if messages_delivered < 3 {
3475                 if simulate_broken_lnd {
3476                         // lnd has a long-standing bug where they send a funding_locked prior to a
3477                         // channel_reestablish if you reconnect prior to funding_locked time.
3478                         //
3479                         // Here we simulate that behavior, delivering a funding_locked immediately on
3480                         // reconnect. Note that we don't bother skipping the now-duplicate funding_locked sent
3481                         // in `reconnect_nodes` but we currently don't fail based on that.
3482                         //
3483                         // See-also <https://github.com/lightningnetwork/lnd/issues/4006>
3484                         nodes[1].node.handle_funding_locked(&nodes[0].node.get_our_node_id(), &as_funding_locked.as_ref().unwrap().0);
3485                 }
3486                 // Even if the funding_locked messages get exchanged, as long as nothing further was
3487                 // received on either side, both sides will need to resend them.
3488                 reconnect_nodes(&nodes[0], &nodes[1], (true, true), (0, 1), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
3489         } else if messages_delivered == 3 {
3490                 // nodes[0] still wants its RAA + commitment_signed
3491                 reconnect_nodes(&nodes[0], &nodes[1], (false, false), (-1, 0), (0, 0), (0, 0), (0, 0), (0, 0), (true, false));
3492         } else if messages_delivered == 4 {
3493                 // nodes[0] still wants its commitment_signed
3494                 reconnect_nodes(&nodes[0], &nodes[1], (false, false), (-1, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
3495         } else if messages_delivered == 5 {
3496                 // nodes[1] still wants its final RAA
3497                 reconnect_nodes(&nodes[0], &nodes[1], (false, false), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, true));
3498         } else if messages_delivered == 6 {
3499                 // Everything was delivered...
3500                 reconnect_nodes(&nodes[0], &nodes[1], (false, false), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
3501         }
3502
3503         let events_1 = nodes[1].node.get_and_clear_pending_events();
3504         assert_eq!(events_1.len(), 1);
3505         match events_1[0] {
3506                 Event::PendingHTLCsForwardable { .. } => { },
3507                 _ => panic!("Unexpected event"),
3508         };
3509
3510         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
3511         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
3512         reconnect_nodes(&nodes[0], &nodes[1], (false, false), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
3513
3514         nodes[1].node.process_pending_htlc_forwards();
3515
3516         let events_2 = nodes[1].node.get_and_clear_pending_events();
3517         assert_eq!(events_2.len(), 1);
3518         match events_2[0] {
3519                 Event::PaymentReceived { ref payment_hash, ref purpose, amt } => {
3520                         assert_eq!(payment_hash_1, *payment_hash);
3521                         assert_eq!(amt, 1000000);
3522                         match &purpose {
3523                                 PaymentPurpose::InvoicePayment { payment_preimage, payment_secret, .. } => {
3524                                         assert!(payment_preimage.is_none());
3525                                         assert_eq!(payment_secret_1, *payment_secret);
3526                                 },
3527                                 _ => panic!("expected PaymentPurpose::InvoicePayment")
3528                         }
3529                 },
3530                 _ => panic!("Unexpected event"),
3531         }
3532
3533         nodes[1].node.claim_funds(payment_preimage_1);
3534         check_added_monitors!(nodes[1], 1);
3535
3536         let events_3 = nodes[1].node.get_and_clear_pending_msg_events();
3537         assert_eq!(events_3.len(), 1);
3538         let (update_fulfill_htlc, commitment_signed) = match events_3[0] {
3539                 MessageSendEvent::UpdateHTLCs { ref node_id, ref updates } => {
3540                         assert_eq!(*node_id, nodes[0].node.get_our_node_id());
3541                         assert!(updates.update_add_htlcs.is_empty());
3542                         assert!(updates.update_fail_htlcs.is_empty());
3543                         assert_eq!(updates.update_fulfill_htlcs.len(), 1);
3544                         assert!(updates.update_fail_malformed_htlcs.is_empty());
3545                         assert!(updates.update_fee.is_none());
3546                         (updates.update_fulfill_htlcs[0].clone(), updates.commitment_signed.clone())
3547                 },
3548                 _ => panic!("Unexpected event"),
3549         };
3550
3551         if messages_delivered >= 1 {
3552                 nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &update_fulfill_htlc);
3553
3554                 let events_4 = nodes[0].node.get_and_clear_pending_events();
3555                 assert_eq!(events_4.len(), 1);
3556                 match events_4[0] {
3557                         Event::PaymentSent { ref payment_preimage } => {
3558                                 assert_eq!(payment_preimage_1, *payment_preimage);
3559                         },
3560                         _ => panic!("Unexpected event"),
3561                 }
3562
3563                 if messages_delivered >= 2 {
3564                         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &commitment_signed);
3565                         check_added_monitors!(nodes[0], 1);
3566                         let (as_revoke_and_ack, as_commitment_signed) = get_revoke_commit_msgs!(nodes[0], nodes[1].node.get_our_node_id());
3567
3568                         if messages_delivered >= 3 {
3569                                 nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_revoke_and_ack);
3570                                 assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
3571                                 check_added_monitors!(nodes[1], 1);
3572
3573                                 if messages_delivered >= 4 {
3574                                         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &as_commitment_signed);
3575                                         let bs_revoke_and_ack = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
3576                                         // No commitment_signed so get_event_msg's assert(len == 1) passes
3577                                         check_added_monitors!(nodes[1], 1);
3578
3579                                         if messages_delivered >= 5 {
3580                                                 nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_revoke_and_ack);
3581                                                 assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
3582                                                 check_added_monitors!(nodes[0], 1);
3583                                         }
3584                                 }
3585                         }
3586                 }
3587         }
3588
3589         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
3590         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
3591         if messages_delivered < 2 {
3592                 reconnect_nodes(&nodes[0], &nodes[1], (false, false), (0, 0), (1, 0), (0, 0), (0, 0), (0, 0), (false, false));
3593                 if messages_delivered < 1 {
3594                         let events_4 = nodes[0].node.get_and_clear_pending_events();
3595                         assert_eq!(events_4.len(), 1);
3596                         match events_4[0] {
3597                                 Event::PaymentSent { ref payment_preimage } => {
3598                                         assert_eq!(payment_preimage_1, *payment_preimage);
3599                                 },
3600                                 _ => panic!("Unexpected event"),
3601                         }
3602                 } else {
3603                         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
3604                 }
3605         } else if messages_delivered == 2 {
3606                 // nodes[0] still wants its RAA + commitment_signed
3607                 reconnect_nodes(&nodes[0], &nodes[1], (false, false), (0, -1), (0, 0), (0, 0), (0, 0), (0, 0), (false, true));
3608         } else if messages_delivered == 3 {
3609                 // nodes[0] still wants its commitment_signed
3610                 reconnect_nodes(&nodes[0], &nodes[1], (false, false), (0, -1), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
3611         } else if messages_delivered == 4 {
3612                 // nodes[1] still wants its final RAA
3613                 reconnect_nodes(&nodes[0], &nodes[1], (false, false), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (true, false));
3614         } else if messages_delivered == 5 {
3615                 // Everything was delivered...
3616                 reconnect_nodes(&nodes[0], &nodes[1], (false, false), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
3617         }
3618
3619         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
3620         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
3621         reconnect_nodes(&nodes[0], &nodes[1], (false, false), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
3622
3623         // Channel should still work fine...
3624         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
3625         let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph,
3626                 &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), Some(&nodes[0].node.list_usable_channels().iter().collect::<Vec<_>>()),
3627                 &Vec::new(), 1000000, TEST_FINAL_CLTV, &logger).unwrap();
3628         let payment_preimage_2 = send_along_route(&nodes[0], route, &[&nodes[1]], 1000000).0;
3629         claim_payment(&nodes[0], &[&nodes[1]], payment_preimage_2);
3630 }
3631
3632 #[test]
3633 fn test_drop_messages_peer_disconnect_a() {
3634         do_test_drop_messages_peer_disconnect(0, true);
3635         do_test_drop_messages_peer_disconnect(0, false);
3636         do_test_drop_messages_peer_disconnect(1, false);
3637         do_test_drop_messages_peer_disconnect(2, false);
3638 }
3639
3640 #[test]
3641 fn test_drop_messages_peer_disconnect_b() {
3642         do_test_drop_messages_peer_disconnect(3, false);
3643         do_test_drop_messages_peer_disconnect(4, false);
3644         do_test_drop_messages_peer_disconnect(5, false);
3645         do_test_drop_messages_peer_disconnect(6, false);
3646 }
3647
3648 #[test]
3649 fn test_funding_peer_disconnect() {
3650         // Test that we can lock in our funding tx while disconnected
3651         let chanmon_cfgs = create_chanmon_cfgs(2);
3652         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
3653         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
3654         let persister: test_utils::TestPersister;
3655         let new_chain_monitor: test_utils::TestChainMonitor;
3656         let nodes_0_deserialized: ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
3657         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
3658         let tx = create_chan_between_nodes_with_value_init(&nodes[0], &nodes[1], 100000, 10001, InitFeatures::known(), InitFeatures::known());
3659
3660         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
3661         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
3662
3663         confirm_transaction(&nodes[0], &tx);
3664         let events_1 = nodes[0].node.get_and_clear_pending_msg_events();
3665         assert_eq!(events_1.len(), 1);
3666         match events_1[0] {
3667                 MessageSendEvent::SendFundingLocked { ref node_id, msg: _ } => {
3668                         assert_eq!(*node_id, nodes[1].node.get_our_node_id());
3669                 },
3670                 _ => panic!("Unexpected event"),
3671         }
3672
3673         reconnect_nodes(&nodes[0], &nodes[1], (false, true), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
3674
3675         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
3676         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
3677
3678         confirm_transaction(&nodes[1], &tx);
3679         let events_2 = nodes[1].node.get_and_clear_pending_msg_events();
3680         assert_eq!(events_2.len(), 2);
3681         let funding_locked = match events_2[0] {
3682                 MessageSendEvent::SendFundingLocked { ref node_id, ref msg } => {
3683                         assert_eq!(*node_id, nodes[0].node.get_our_node_id());
3684                         msg.clone()
3685                 },
3686                 _ => panic!("Unexpected event"),
3687         };
3688         let bs_announcement_sigs = match events_2[1] {
3689                 MessageSendEvent::SendAnnouncementSignatures { ref node_id, ref msg } => {
3690                         assert_eq!(*node_id, nodes[0].node.get_our_node_id());
3691                         msg.clone()
3692                 },
3693                 _ => panic!("Unexpected event"),
3694         };
3695
3696         reconnect_nodes(&nodes[0], &nodes[1], (true, true), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
3697
3698         nodes[0].node.handle_funding_locked(&nodes[1].node.get_our_node_id(), &funding_locked);
3699         nodes[0].node.handle_announcement_signatures(&nodes[1].node.get_our_node_id(), &bs_announcement_sigs);
3700         let events_3 = nodes[0].node.get_and_clear_pending_msg_events();
3701         assert_eq!(events_3.len(), 2);
3702         let as_announcement_sigs = match events_3[0] {
3703                 MessageSendEvent::SendAnnouncementSignatures { ref node_id, ref msg } => {
3704                         assert_eq!(*node_id, nodes[1].node.get_our_node_id());
3705                         msg.clone()
3706                 },
3707                 _ => panic!("Unexpected event"),
3708         };
3709         let (as_announcement, as_update) = match events_3[1] {
3710                 MessageSendEvent::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
3711                         (msg.clone(), update_msg.clone())
3712                 },
3713                 _ => panic!("Unexpected event"),
3714         };
3715
3716         nodes[1].node.handle_announcement_signatures(&nodes[0].node.get_our_node_id(), &as_announcement_sigs);
3717         let events_4 = nodes[1].node.get_and_clear_pending_msg_events();
3718         assert_eq!(events_4.len(), 1);
3719         let (_, bs_update) = match events_4[0] {
3720                 MessageSendEvent::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
3721                         (msg.clone(), update_msg.clone())
3722                 },
3723                 _ => panic!("Unexpected event"),
3724         };
3725
3726         nodes[0].net_graph_msg_handler.handle_channel_announcement(&as_announcement).unwrap();
3727         nodes[0].net_graph_msg_handler.handle_channel_update(&bs_update).unwrap();
3728         nodes[0].net_graph_msg_handler.handle_channel_update(&as_update).unwrap();
3729
3730         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
3731         let logger = test_utils::TestLogger::new();
3732         let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 1000000, TEST_FINAL_CLTV, &logger).unwrap();
3733         let (payment_preimage, _, _) = send_along_route(&nodes[0], route, &[&nodes[1]], 1000000);
3734         claim_payment(&nodes[0], &[&nodes[1]], payment_preimage);
3735
3736         // Check that after deserialization and reconnection we can still generate an identical
3737         // channel_announcement from the cached signatures.
3738         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
3739
3740         let nodes_0_serialized = nodes[0].node.encode();
3741         let mut chan_0_monitor_serialized = test_utils::TestVecWriter(Vec::new());
3742         nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap().iter().next().unwrap().1.write(&mut chan_0_monitor_serialized).unwrap();
3743
3744         persister = test_utils::TestPersister::new();
3745         let keys_manager = &chanmon_cfgs[0].keys_manager;
3746         new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[0].chain_source), nodes[0].tx_broadcaster.clone(), nodes[0].logger, node_cfgs[0].fee_estimator, &persister, keys_manager);
3747         nodes[0].chain_monitor = &new_chain_monitor;
3748         let mut chan_0_monitor_read = &chan_0_monitor_serialized.0[..];
3749         let (_, mut chan_0_monitor) = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(
3750                 &mut chan_0_monitor_read, keys_manager).unwrap();
3751         assert!(chan_0_monitor_read.is_empty());
3752
3753         let mut nodes_0_read = &nodes_0_serialized[..];
3754         let (_, nodes_0_deserialized_tmp) = {
3755                 let mut channel_monitors = HashMap::new();
3756                 channel_monitors.insert(chan_0_monitor.get_funding_txo().0, &mut chan_0_monitor);
3757                 <(BlockHash, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
3758                         default_config: UserConfig::default(),
3759                         keys_manager,
3760                         fee_estimator: node_cfgs[0].fee_estimator,
3761                         chain_monitor: nodes[0].chain_monitor,
3762                         tx_broadcaster: nodes[0].tx_broadcaster.clone(),
3763                         logger: nodes[0].logger,
3764                         channel_monitors,
3765                 }).unwrap()
3766         };
3767         nodes_0_deserialized = nodes_0_deserialized_tmp;
3768         assert!(nodes_0_read.is_empty());
3769
3770         assert!(nodes[0].chain_monitor.watch_channel(chan_0_monitor.get_funding_txo().0, chan_0_monitor).is_ok());
3771         nodes[0].node = &nodes_0_deserialized;
3772         check_added_monitors!(nodes[0], 1);
3773
3774         reconnect_nodes(&nodes[0], &nodes[1], (false, false), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
3775
3776         // as_announcement should be re-generated exactly by broadcast_node_announcement.
3777         nodes[0].node.broadcast_node_announcement([0, 0, 0], [0; 32], Vec::new());
3778         let msgs = nodes[0].node.get_and_clear_pending_msg_events();
3779         let mut found_announcement = false;
3780         for event in msgs.iter() {
3781                 match event {
3782                         MessageSendEvent::BroadcastChannelAnnouncement { ref msg, .. } => {
3783                                 if *msg == as_announcement { found_announcement = true; }
3784                         },
3785                         MessageSendEvent::BroadcastNodeAnnouncement { .. } => {},
3786                         _ => panic!("Unexpected event"),
3787                 }
3788         }
3789         assert!(found_announcement);
3790 }
3791
3792 #[test]
3793 fn test_drop_messages_peer_disconnect_dual_htlc() {
3794         // Test that we can handle reconnecting when both sides of a channel have pending
3795         // commitment_updates when we disconnect.
3796         let chanmon_cfgs = create_chanmon_cfgs(2);
3797         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
3798         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
3799         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
3800         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
3801         let logger = test_utils::TestLogger::new();
3802
3803         let (payment_preimage_1, _, _) = route_payment(&nodes[0], &[&nodes[1]], 1000000);
3804
3805         // Now try to send a second payment which will fail to send
3806         let (payment_preimage_2, payment_hash_2, payment_secret_2) = get_payment_preimage_hash!(nodes[1]);
3807         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
3808         let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 1000000, TEST_FINAL_CLTV, &logger).unwrap();
3809         nodes[0].node.send_payment(&route, payment_hash_2, &Some(payment_secret_2)).unwrap();
3810         check_added_monitors!(nodes[0], 1);
3811
3812         let events_1 = nodes[0].node.get_and_clear_pending_msg_events();
3813         assert_eq!(events_1.len(), 1);
3814         match events_1[0] {
3815                 MessageSendEvent::UpdateHTLCs { .. } => {},
3816                 _ => panic!("Unexpected event"),
3817         }
3818
3819         assert!(nodes[1].node.claim_funds(payment_preimage_1));
3820         check_added_monitors!(nodes[1], 1);
3821
3822         let events_2 = nodes[1].node.get_and_clear_pending_msg_events();
3823         assert_eq!(events_2.len(), 1);
3824         match events_2[0] {
3825                 MessageSendEvent::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, ref update_fee, ref commitment_signed } } => {
3826                         assert_eq!(*node_id, nodes[0].node.get_our_node_id());
3827                         assert!(update_add_htlcs.is_empty());
3828                         assert_eq!(update_fulfill_htlcs.len(), 1);
3829                         assert!(update_fail_htlcs.is_empty());
3830                         assert!(update_fail_malformed_htlcs.is_empty());
3831                         assert!(update_fee.is_none());
3832
3833                         nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &update_fulfill_htlcs[0]);
3834                         let events_3 = nodes[0].node.get_and_clear_pending_events();
3835                         assert_eq!(events_3.len(), 1);
3836                         match events_3[0] {
3837                                 Event::PaymentSent { ref payment_preimage } => {
3838                                         assert_eq!(*payment_preimage, payment_preimage_1);
3839                                 },
3840                                 _ => panic!("Unexpected event"),
3841                         }
3842
3843                         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), commitment_signed);
3844                         let _ = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
3845                         // No commitment_signed so get_event_msg's assert(len == 1) passes
3846                         check_added_monitors!(nodes[0], 1);
3847                 },
3848                 _ => panic!("Unexpected event"),
3849         }
3850
3851         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
3852         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
3853
3854         nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: InitFeatures::empty() });
3855         let reestablish_1 = get_chan_reestablish_msgs!(nodes[0], nodes[1]);
3856         assert_eq!(reestablish_1.len(), 1);
3857         nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: InitFeatures::empty() });
3858         let reestablish_2 = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
3859         assert_eq!(reestablish_2.len(), 1);
3860
3861         nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &reestablish_2[0]);
3862         let as_resp = handle_chan_reestablish_msgs!(nodes[0], nodes[1]);
3863         nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &reestablish_1[0]);
3864         let bs_resp = handle_chan_reestablish_msgs!(nodes[1], nodes[0]);
3865
3866         assert!(as_resp.0.is_none());
3867         assert!(bs_resp.0.is_none());
3868
3869         assert!(bs_resp.1.is_none());
3870         assert!(bs_resp.2.is_none());
3871
3872         assert!(as_resp.3 == RAACommitmentOrder::CommitmentFirst);
3873
3874         assert_eq!(as_resp.2.as_ref().unwrap().update_add_htlcs.len(), 1);
3875         assert!(as_resp.2.as_ref().unwrap().update_fulfill_htlcs.is_empty());
3876         assert!(as_resp.2.as_ref().unwrap().update_fail_htlcs.is_empty());
3877         assert!(as_resp.2.as_ref().unwrap().update_fail_malformed_htlcs.is_empty());
3878         assert!(as_resp.2.as_ref().unwrap().update_fee.is_none());
3879         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &as_resp.2.as_ref().unwrap().update_add_htlcs[0]);
3880         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &as_resp.2.as_ref().unwrap().commitment_signed);
3881         let bs_revoke_and_ack = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
3882         // No commitment_signed so get_event_msg's assert(len == 1) passes
3883         check_added_monitors!(nodes[1], 1);
3884
3885         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), as_resp.1.as_ref().unwrap());
3886         let bs_second_commitment_signed = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
3887         assert!(bs_second_commitment_signed.update_add_htlcs.is_empty());
3888         assert!(bs_second_commitment_signed.update_fulfill_htlcs.is_empty());
3889         assert!(bs_second_commitment_signed.update_fail_htlcs.is_empty());
3890         assert!(bs_second_commitment_signed.update_fail_malformed_htlcs.is_empty());
3891         assert!(bs_second_commitment_signed.update_fee.is_none());
3892         check_added_monitors!(nodes[1], 1);
3893
3894         nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_revoke_and_ack);
3895         let as_commitment_signed = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
3896         assert!(as_commitment_signed.update_add_htlcs.is_empty());
3897         assert!(as_commitment_signed.update_fulfill_htlcs.is_empty());
3898         assert!(as_commitment_signed.update_fail_htlcs.is_empty());
3899         assert!(as_commitment_signed.update_fail_malformed_htlcs.is_empty());
3900         assert!(as_commitment_signed.update_fee.is_none());
3901         check_added_monitors!(nodes[0], 1);
3902
3903         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &bs_second_commitment_signed.commitment_signed);
3904         let as_revoke_and_ack = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
3905         // No commitment_signed so get_event_msg's assert(len == 1) passes
3906         check_added_monitors!(nodes[0], 1);
3907
3908         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &as_commitment_signed.commitment_signed);
3909         let bs_second_revoke_and_ack = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
3910         // No commitment_signed so get_event_msg's assert(len == 1) passes
3911         check_added_monitors!(nodes[1], 1);
3912
3913         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_revoke_and_ack);
3914         assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
3915         check_added_monitors!(nodes[1], 1);
3916
3917         expect_pending_htlcs_forwardable!(nodes[1]);
3918
3919         let events_5 = nodes[1].node.get_and_clear_pending_events();
3920         assert_eq!(events_5.len(), 1);
3921         match events_5[0] {
3922                 Event::PaymentReceived { ref payment_hash, ref purpose, .. } => {
3923                         assert_eq!(payment_hash_2, *payment_hash);
3924                         match &purpose {
3925                                 PaymentPurpose::InvoicePayment { payment_preimage, payment_secret, .. } => {
3926                                         assert!(payment_preimage.is_none());
3927                                         assert_eq!(payment_secret_2, *payment_secret);
3928                                 },
3929                                 _ => panic!("expected PaymentPurpose::InvoicePayment")
3930                         }
3931                 },
3932                 _ => panic!("Unexpected event"),
3933         }
3934
3935         nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_second_revoke_and_ack);
3936         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
3937         check_added_monitors!(nodes[0], 1);
3938
3939         claim_payment(&nodes[0], &[&nodes[1]], payment_preimage_2);
3940 }
3941
3942 fn do_test_htlc_timeout(send_partial_mpp: bool) {
3943         // If the user fails to claim/fail an HTLC within the HTLC CLTV timeout we fail it for them
3944         // to avoid our counterparty failing the channel.
3945         let chanmon_cfgs = create_chanmon_cfgs(2);
3946         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
3947         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
3948         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
3949
3950         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
3951         let logger = test_utils::TestLogger::new();
3952
3953         let our_payment_hash = if send_partial_mpp {
3954                 let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
3955                 let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 100000, TEST_FINAL_CLTV, &logger).unwrap();
3956                 let (_, our_payment_hash, payment_secret) = get_payment_preimage_hash!(&nodes[1]);
3957                 // Use the utility function send_payment_along_path to send the payment with MPP data which
3958                 // indicates there are more HTLCs coming.
3959                 let cur_height = CHAN_CONFIRM_DEPTH + 1; // route_payment calls send_payment, which adds 1 to the current height. So we do the same here to match.
3960                 let mpp_id = MppId([42; 32]);
3961                 nodes[0].node.send_payment_along_path(&route.paths[0], &our_payment_hash, &Some(payment_secret), 200000, cur_height, mpp_id, &None).unwrap();
3962                 check_added_monitors!(nodes[0], 1);
3963                 let mut events = nodes[0].node.get_and_clear_pending_msg_events();
3964                 assert_eq!(events.len(), 1);
3965                 // Now do the relevant commitment_signed/RAA dances along the path, noting that the final
3966                 // hop should *not* yet generate any PaymentReceived event(s).
3967                 pass_along_path(&nodes[0], &[&nodes[1]], 100000, our_payment_hash, Some(payment_secret), events.drain(..).next().unwrap(), false, None);
3968                 our_payment_hash
3969         } else {
3970                 route_payment(&nodes[0], &[&nodes[1]], 100000).1
3971         };
3972
3973         let mut block = Block {
3974                 header: BlockHeader { version: 0x20000000, prev_blockhash: nodes[0].best_block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 },
3975                 txdata: vec![],
3976         };
3977         connect_block(&nodes[0], &block);
3978         connect_block(&nodes[1], &block);
3979         let block_count = TEST_FINAL_CLTV + CHAN_CONFIRM_DEPTH + 2 - CLTV_CLAIM_BUFFER - LATENCY_GRACE_PERIOD_BLOCKS;
3980         for _ in CHAN_CONFIRM_DEPTH + 2..block_count {
3981                 block.header.prev_blockhash = block.block_hash();
3982                 connect_block(&nodes[0], &block);
3983                 connect_block(&nodes[1], &block);
3984         }
3985
3986         expect_pending_htlcs_forwardable!(nodes[1]);
3987
3988         check_added_monitors!(nodes[1], 1);
3989         let htlc_timeout_updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
3990         assert!(htlc_timeout_updates.update_add_htlcs.is_empty());
3991         assert_eq!(htlc_timeout_updates.update_fail_htlcs.len(), 1);
3992         assert!(htlc_timeout_updates.update_fail_malformed_htlcs.is_empty());
3993         assert!(htlc_timeout_updates.update_fee.is_none());
3994
3995         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &htlc_timeout_updates.update_fail_htlcs[0]);
3996         commitment_signed_dance!(nodes[0], nodes[1], htlc_timeout_updates.commitment_signed, false);
3997         // 100_000 msat as u64, followed by the height at which we failed back above
3998         let mut expected_failure_data = byte_utils::be64_to_array(100_000).to_vec();
3999         expected_failure_data.extend_from_slice(&byte_utils::be32_to_array(block_count - 1));
4000         expect_payment_failed!(nodes[0], our_payment_hash, true, 0x4000 | 15, &expected_failure_data[..]);
4001 }
4002
4003 #[test]
4004 fn test_htlc_timeout() {
4005         do_test_htlc_timeout(true);
4006         do_test_htlc_timeout(false);
4007 }
4008
4009 fn do_test_holding_cell_htlc_add_timeouts(forwarded_htlc: bool) {
4010         // Tests that HTLCs in the holding cell are timed out after the requisite number of blocks.
4011         let chanmon_cfgs = create_chanmon_cfgs(3);
4012         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
4013         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
4014         let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs);
4015         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
4016         let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2, InitFeatures::known(), InitFeatures::known());
4017
4018         // Make sure all nodes are at the same starting height
4019         connect_blocks(&nodes[0], 2*CHAN_CONFIRM_DEPTH + 1 - nodes[0].best_block_info().1);
4020         connect_blocks(&nodes[1], 2*CHAN_CONFIRM_DEPTH + 1 - nodes[1].best_block_info().1);
4021         connect_blocks(&nodes[2], 2*CHAN_CONFIRM_DEPTH + 1 - nodes[2].best_block_info().1);
4022
4023         let logger = test_utils::TestLogger::new();
4024
4025         // Route a first payment to get the 1 -> 2 channel in awaiting_raa...
4026         let (_, first_payment_hash, first_payment_secret) = get_payment_preimage_hash!(nodes[2]);
4027         {
4028                 let net_graph_msg_handler = &nodes[1].net_graph_msg_handler;
4029                 let route = get_route(&nodes[1].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[2].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 100000, TEST_FINAL_CLTV, &logger).unwrap();
4030                 nodes[1].node.send_payment(&route, first_payment_hash, &Some(first_payment_secret)).unwrap();
4031         }
4032         assert_eq!(nodes[1].node.get_and_clear_pending_msg_events().len(), 1);
4033         check_added_monitors!(nodes[1], 1);
4034
4035         // Now attempt to route a second payment, which should be placed in the holding cell
4036         let (_, second_payment_hash, second_payment_secret) = get_payment_preimage_hash!(nodes[2]);
4037         if forwarded_htlc {
4038                 let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
4039                 let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[2].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 100000, TEST_FINAL_CLTV, &logger).unwrap();
4040                 nodes[0].node.send_payment(&route, second_payment_hash, &Some(first_payment_secret)).unwrap();
4041                 check_added_monitors!(nodes[0], 1);
4042                 let payment_event = SendEvent::from_event(nodes[0].node.get_and_clear_pending_msg_events().remove(0));
4043                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
4044                 commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
4045                 expect_pending_htlcs_forwardable!(nodes[1]);
4046                 check_added_monitors!(nodes[1], 0);
4047         } else {
4048                 let net_graph_msg_handler = &nodes[1].net_graph_msg_handler;
4049                 let route = get_route(&nodes[1].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[2].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 100000, TEST_FINAL_CLTV, &logger).unwrap();
4050                 nodes[1].node.send_payment(&route, second_payment_hash, &Some(second_payment_secret)).unwrap();
4051                 check_added_monitors!(nodes[1], 0);
4052         }
4053
4054         connect_blocks(&nodes[1], TEST_FINAL_CLTV - CLTV_CLAIM_BUFFER - LATENCY_GRACE_PERIOD_BLOCKS);
4055         assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
4056         assert!(nodes[1].node.get_and_clear_pending_events().is_empty());
4057         connect_blocks(&nodes[1], 1);
4058
4059         if forwarded_htlc {
4060                 expect_pending_htlcs_forwardable!(nodes[1]);
4061                 check_added_monitors!(nodes[1], 1);
4062                 let fail_commit = nodes[1].node.get_and_clear_pending_msg_events();
4063                 assert_eq!(fail_commit.len(), 1);
4064                 match fail_commit[0] {
4065                         MessageSendEvent::UpdateHTLCs { updates: msgs::CommitmentUpdate { ref update_fail_htlcs, ref commitment_signed, .. }, .. } => {
4066                                 nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &update_fail_htlcs[0]);
4067                                 commitment_signed_dance!(nodes[0], nodes[1], commitment_signed, true, true);
4068                         },
4069                         _ => unreachable!(),
4070                 }
4071                 expect_payment_failed_with_update!(nodes[0], second_payment_hash, false, chan_2.0.contents.short_channel_id, false);
4072         } else {
4073                 expect_payment_failed!(nodes[1], second_payment_hash, true);
4074         }
4075 }
4076
4077 #[test]
4078 fn test_holding_cell_htlc_add_timeouts() {
4079         do_test_holding_cell_htlc_add_timeouts(false);
4080         do_test_holding_cell_htlc_add_timeouts(true);
4081 }
4082
4083 #[test]
4084 fn test_no_txn_manager_serialize_deserialize() {
4085         let chanmon_cfgs = create_chanmon_cfgs(2);
4086         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
4087         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
4088         let logger: test_utils::TestLogger;
4089         let fee_estimator: test_utils::TestFeeEstimator;
4090         let persister: test_utils::TestPersister;
4091         let new_chain_monitor: test_utils::TestChainMonitor;
4092         let nodes_0_deserialized: ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
4093         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
4094
4095         let tx = create_chan_between_nodes_with_value_init(&nodes[0], &nodes[1], 100000, 10001, InitFeatures::known(), InitFeatures::known());
4096
4097         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
4098
4099         let nodes_0_serialized = nodes[0].node.encode();
4100         let mut chan_0_monitor_serialized = test_utils::TestVecWriter(Vec::new());
4101         nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap().iter().next().unwrap().1.write(&mut chan_0_monitor_serialized).unwrap();
4102
4103         logger = test_utils::TestLogger::new();
4104         fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(253) };
4105         persister = test_utils::TestPersister::new();
4106         let keys_manager = &chanmon_cfgs[0].keys_manager;
4107         new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[0].chain_source), nodes[0].tx_broadcaster.clone(), &logger, &fee_estimator, &persister, keys_manager);
4108         nodes[0].chain_monitor = &new_chain_monitor;
4109         let mut chan_0_monitor_read = &chan_0_monitor_serialized.0[..];
4110         let (_, mut chan_0_monitor) = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(
4111                 &mut chan_0_monitor_read, keys_manager).unwrap();
4112         assert!(chan_0_monitor_read.is_empty());
4113
4114         let mut nodes_0_read = &nodes_0_serialized[..];
4115         let config = UserConfig::default();
4116         let (_, nodes_0_deserialized_tmp) = {
4117                 let mut channel_monitors = HashMap::new();
4118                 channel_monitors.insert(chan_0_monitor.get_funding_txo().0, &mut chan_0_monitor);
4119                 <(BlockHash, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
4120                         default_config: config,
4121                         keys_manager,
4122                         fee_estimator: &fee_estimator,
4123                         chain_monitor: nodes[0].chain_monitor,
4124                         tx_broadcaster: nodes[0].tx_broadcaster.clone(),
4125                         logger: &logger,
4126                         channel_monitors,
4127                 }).unwrap()
4128         };
4129         nodes_0_deserialized = nodes_0_deserialized_tmp;
4130         assert!(nodes_0_read.is_empty());
4131
4132         assert!(nodes[0].chain_monitor.watch_channel(chan_0_monitor.get_funding_txo().0, chan_0_monitor).is_ok());
4133         nodes[0].node = &nodes_0_deserialized;
4134         assert_eq!(nodes[0].node.list_channels().len(), 1);
4135         check_added_monitors!(nodes[0], 1);
4136
4137         nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: InitFeatures::empty() });
4138         let reestablish_1 = get_chan_reestablish_msgs!(nodes[0], nodes[1]);
4139         nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: InitFeatures::empty() });
4140         let reestablish_2 = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
4141
4142         nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &reestablish_1[0]);
4143         assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
4144         nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &reestablish_2[0]);
4145         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
4146
4147         let (funding_locked, _) = create_chan_between_nodes_with_value_confirm(&nodes[0], &nodes[1], &tx);
4148         let (announcement, as_update, bs_update) = create_chan_between_nodes_with_value_b(&nodes[0], &nodes[1], &funding_locked);
4149         for node in nodes.iter() {
4150                 assert!(node.net_graph_msg_handler.handle_channel_announcement(&announcement).unwrap());
4151                 node.net_graph_msg_handler.handle_channel_update(&as_update).unwrap();
4152                 node.net_graph_msg_handler.handle_channel_update(&bs_update).unwrap();
4153         }
4154
4155         send_payment(&nodes[0], &[&nodes[1]], 1000000);
4156 }
4157
4158 #[test]
4159 fn mpp_failure() {
4160         let chanmon_cfgs = create_chanmon_cfgs(4);
4161         let node_cfgs = create_node_cfgs(4, &chanmon_cfgs);
4162         let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs, &[None, None, None, None]);
4163         let nodes = create_network(4, &node_cfgs, &node_chanmgrs);
4164
4165         let chan_1_id = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
4166         let chan_2_id = create_announced_chan_between_nodes(&nodes, 0, 2, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
4167         let chan_3_id = create_announced_chan_between_nodes(&nodes, 1, 3, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
4168         let chan_4_id = create_announced_chan_between_nodes(&nodes, 2, 3, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
4169         let logger = test_utils::TestLogger::new();
4170
4171         let (_, payment_hash, payment_secret) = get_payment_preimage_hash!(&nodes[3]);
4172         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
4173         let mut route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[3].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], 100000, TEST_FINAL_CLTV, &logger).unwrap();
4174         let path = route.paths[0].clone();
4175         route.paths.push(path);
4176         route.paths[0][0].pubkey = nodes[1].node.get_our_node_id();
4177         route.paths[0][0].short_channel_id = chan_1_id;
4178         route.paths[0][1].short_channel_id = chan_3_id;
4179         route.paths[1][0].pubkey = nodes[2].node.get_our_node_id();
4180         route.paths[1][0].short_channel_id = chan_2_id;
4181         route.paths[1][1].short_channel_id = chan_4_id;
4182         send_along_route_with_secret(&nodes[0], route, &[&[&nodes[1], &nodes[3]], &[&nodes[2], &nodes[3]]], 200_000, payment_hash, payment_secret);
4183         fail_payment_along_route(&nodes[0], &[&[&nodes[1], &nodes[3]], &[&nodes[2], &nodes[3]]], false, payment_hash);
4184 }
4185
4186 #[test]
4187 fn test_dup_htlc_onchain_fails_on_reload() {
4188         // When a Channel is closed, any outbound HTLCs which were relayed through it are simply
4189         // dropped when the Channel is. From there, the ChannelManager relies on the ChannelMonitor
4190         // having a copy of the relevant fail-/claim-back data and processes the HTLC fail/claim when
4191         // the ChannelMonitor tells it to.
4192         //
4193         // If, due to an on-chain event, an HTLC is failed/claimed, and then we serialize the
4194         // ChannelManager, we generally expect there not to be a duplicate HTLC fail/claim (eg via a
4195         // PaymentPathFailed event appearing). However, because we may not serialize the relevant
4196         // ChannelMonitor at the same time, this isn't strictly guaranteed. In order to provide this
4197         // consistency, the ChannelManager explicitly tracks pending-onchain-resolution outbound HTLCs
4198         // and de-duplicates ChannelMonitor events.
4199         //
4200         // This tests that explicit tracking behavior.
4201         let chanmon_cfgs = create_chanmon_cfgs(2);
4202         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
4203         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
4204         let persister: test_utils::TestPersister;
4205         let new_chain_monitor: test_utils::TestChainMonitor;
4206         let nodes_0_deserialized: ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
4207         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
4208
4209         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
4210
4211         // Route a payment, but force-close the channel before the HTLC fulfill message arrives at
4212         // nodes[0].
4213         let (payment_preimage, _, _) = route_payment(&nodes[0], &[&nodes[1]], 10000000);
4214         nodes[0].node.force_close_channel(&nodes[0].node.list_channels()[0].channel_id).unwrap();
4215         check_closed_broadcast!(nodes[0], true);
4216         check_added_monitors!(nodes[0], 1);
4217         check_closed_event!(nodes[0], 1, ClosureReason::HolderForceClosed);
4218
4219         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
4220         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
4221
4222         // Connect blocks until the CLTV timeout is up so that we get an HTLC-Timeout transaction
4223         connect_blocks(&nodes[0], TEST_FINAL_CLTV + LATENCY_GRACE_PERIOD_BLOCKS + 1);
4224         let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().split_off(0);
4225         assert_eq!(node_txn.len(), 3);
4226         assert_eq!(node_txn[0], node_txn[1]);
4227
4228         assert!(nodes[1].node.claim_funds(payment_preimage));
4229         check_added_monitors!(nodes[1], 1);
4230
4231         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: nodes[1].best_block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
4232         connect_block(&nodes[1], &Block { header, txdata: vec![node_txn[1].clone(), node_txn[2].clone()]});
4233         check_closed_broadcast!(nodes[1], true);
4234         check_added_monitors!(nodes[1], 1);
4235         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
4236         let claim_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap().split_off(0);
4237
4238         header.prev_blockhash = nodes[0].best_block_hash();
4239         connect_block(&nodes[0], &Block { header, txdata: vec![node_txn[1].clone(), node_txn[2].clone()]});
4240
4241         // Serialize out the ChannelMonitor before connecting the on-chain claim transactions. This is
4242         // fairly normal behavior as ChannelMonitor(s) are often not re-serialized when on-chain events
4243         // happen, unlike ChannelManager which tends to be re-serialized after any relevant event(s).
4244         let mut chan_0_monitor_serialized = test_utils::TestVecWriter(Vec::new());
4245         nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap().iter().next().unwrap().1.write(&mut chan_0_monitor_serialized).unwrap();
4246
4247         header.prev_blockhash = nodes[0].best_block_hash();
4248         let claim_block = Block { header, txdata: claim_txn};
4249         connect_block(&nodes[0], &claim_block);
4250         expect_payment_sent!(nodes[0], payment_preimage);
4251
4252         // ChannelManagers generally get re-serialized after any relevant event(s). Since we just
4253         // connected a highly-relevant block, it likely gets serialized out now.
4254         let mut chan_manager_serialized = test_utils::TestVecWriter(Vec::new());
4255         nodes[0].node.write(&mut chan_manager_serialized).unwrap();
4256
4257         // Now reload nodes[0]...
4258         persister = test_utils::TestPersister::new();
4259         let keys_manager = &chanmon_cfgs[0].keys_manager;
4260         new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[0].chain_source), nodes[0].tx_broadcaster.clone(), nodes[0].logger, node_cfgs[0].fee_estimator, &persister, keys_manager);
4261         nodes[0].chain_monitor = &new_chain_monitor;
4262         let mut chan_0_monitor_read = &chan_0_monitor_serialized.0[..];
4263         let (_, mut chan_0_monitor) = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(
4264                 &mut chan_0_monitor_read, keys_manager).unwrap();
4265         assert!(chan_0_monitor_read.is_empty());
4266
4267         let (_, nodes_0_deserialized_tmp) = {
4268                 let mut channel_monitors = HashMap::new();
4269                 channel_monitors.insert(chan_0_monitor.get_funding_txo().0, &mut chan_0_monitor);
4270                 <(BlockHash, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>
4271                         ::read(&mut io::Cursor::new(&chan_manager_serialized.0[..]), ChannelManagerReadArgs {
4272                                 default_config: Default::default(),
4273                                 keys_manager,
4274                                 fee_estimator: node_cfgs[0].fee_estimator,
4275                                 chain_monitor: nodes[0].chain_monitor,
4276                                 tx_broadcaster: nodes[0].tx_broadcaster.clone(),
4277                                 logger: nodes[0].logger,
4278                                 channel_monitors,
4279                         }).unwrap()
4280         };
4281         nodes_0_deserialized = nodes_0_deserialized_tmp;
4282
4283         assert!(nodes[0].chain_monitor.watch_channel(chan_0_monitor.get_funding_txo().0, chan_0_monitor).is_ok());
4284         check_added_monitors!(nodes[0], 1);
4285         nodes[0].node = &nodes_0_deserialized;
4286
4287         // Note that if we re-connect the block which exposed nodes[0] to the payment preimage (but
4288         // which the current ChannelMonitor has not seen), the ChannelManager's de-duplication of
4289         // payment events should kick in, leaving us with no pending events here.
4290         let height = nodes[0].blocks.lock().unwrap().len() as u32 - 1;
4291         nodes[0].chain_monitor.chain_monitor.block_connected(&claim_block, height);
4292         assert!(nodes[0].node.get_and_clear_pending_events().is_empty());
4293 }
4294
4295 #[test]
4296 fn test_manager_serialize_deserialize_events() {
4297         // This test makes sure the events field in ChannelManager survives de/serialization
4298         let chanmon_cfgs = create_chanmon_cfgs(2);
4299         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
4300         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
4301         let fee_estimator: test_utils::TestFeeEstimator;
4302         let persister: test_utils::TestPersister;
4303         let logger: test_utils::TestLogger;
4304         let new_chain_monitor: test_utils::TestChainMonitor;
4305         let nodes_0_deserialized: ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
4306         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
4307
4308         // Start creating a channel, but stop right before broadcasting the funding transaction
4309         let channel_value = 100000;
4310         let push_msat = 10001;
4311         let a_flags = InitFeatures::known();
4312         let b_flags = InitFeatures::known();
4313         let node_a = nodes.remove(0);
4314         let node_b = nodes.remove(0);
4315         node_a.node.create_channel(node_b.node.get_our_node_id(), channel_value, push_msat, 42, None).unwrap();
4316         node_b.node.handle_open_channel(&node_a.node.get_our_node_id(), a_flags, &get_event_msg!(node_a, MessageSendEvent::SendOpenChannel, node_b.node.get_our_node_id()));
4317         node_a.node.handle_accept_channel(&node_b.node.get_our_node_id(), b_flags, &get_event_msg!(node_b, MessageSendEvent::SendAcceptChannel, node_a.node.get_our_node_id()));
4318
4319         let (temporary_channel_id, tx, funding_output) = create_funding_transaction(&node_a, channel_value, 42);
4320
4321         node_a.node.funding_transaction_generated(&temporary_channel_id, tx.clone()).unwrap();
4322         check_added_monitors!(node_a, 0);
4323
4324         node_b.node.handle_funding_created(&node_a.node.get_our_node_id(), &get_event_msg!(node_a, MessageSendEvent::SendFundingCreated, node_b.node.get_our_node_id()));
4325         {
4326                 let mut added_monitors = node_b.chain_monitor.added_monitors.lock().unwrap();
4327                 assert_eq!(added_monitors.len(), 1);
4328                 assert_eq!(added_monitors[0].0, funding_output);
4329                 added_monitors.clear();
4330         }
4331
4332         node_a.node.handle_funding_signed(&node_b.node.get_our_node_id(), &get_event_msg!(node_b, MessageSendEvent::SendFundingSigned, node_a.node.get_our_node_id()));
4333         {
4334                 let mut added_monitors = node_a.chain_monitor.added_monitors.lock().unwrap();
4335                 assert_eq!(added_monitors.len(), 1);
4336                 assert_eq!(added_monitors[0].0, funding_output);
4337                 added_monitors.clear();
4338         }
4339         // Normally, this is where node_a would broadcast the funding transaction, but the test de/serializes first instead
4340
4341         nodes.push(node_a);
4342         nodes.push(node_b);
4343
4344         // Start the de/seriailization process mid-channel creation to check that the channel manager will hold onto events that are serialized
4345         let nodes_0_serialized = nodes[0].node.encode();
4346         let mut chan_0_monitor_serialized = test_utils::TestVecWriter(Vec::new());
4347         nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap().iter().next().unwrap().1.write(&mut chan_0_monitor_serialized).unwrap();
4348
4349         fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(253) };
4350         logger = test_utils::TestLogger::new();
4351         persister = test_utils::TestPersister::new();
4352         let keys_manager = &chanmon_cfgs[0].keys_manager;
4353         new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[0].chain_source), nodes[0].tx_broadcaster.clone(), &logger, &fee_estimator, &persister, keys_manager);
4354         nodes[0].chain_monitor = &new_chain_monitor;
4355         let mut chan_0_monitor_read = &chan_0_monitor_serialized.0[..];
4356         let (_, mut chan_0_monitor) = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(
4357                 &mut chan_0_monitor_read, keys_manager).unwrap();
4358         assert!(chan_0_monitor_read.is_empty());
4359
4360         let mut nodes_0_read = &nodes_0_serialized[..];
4361         let config = UserConfig::default();
4362         let (_, nodes_0_deserialized_tmp) = {
4363                 let mut channel_monitors = HashMap::new();
4364                 channel_monitors.insert(chan_0_monitor.get_funding_txo().0, &mut chan_0_monitor);
4365                 <(BlockHash, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
4366                         default_config: config,
4367                         keys_manager,
4368                         fee_estimator: &fee_estimator,
4369                         chain_monitor: nodes[0].chain_monitor,
4370                         tx_broadcaster: nodes[0].tx_broadcaster.clone(),
4371                         logger: &logger,
4372                         channel_monitors,
4373                 }).unwrap()
4374         };
4375         nodes_0_deserialized = nodes_0_deserialized_tmp;
4376         assert!(nodes_0_read.is_empty());
4377
4378         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
4379
4380         assert!(nodes[0].chain_monitor.watch_channel(chan_0_monitor.get_funding_txo().0, chan_0_monitor).is_ok());
4381         nodes[0].node = &nodes_0_deserialized;
4382
4383         // After deserializing, make sure the funding_transaction is still held by the channel manager
4384         let events_4 = nodes[0].node.get_and_clear_pending_events();
4385         assert_eq!(events_4.len(), 0);
4386         assert_eq!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().len(), 1);
4387         assert_eq!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap()[0].txid(), funding_output.txid);
4388
4389         // Make sure the channel is functioning as though the de/serialization never happened
4390         assert_eq!(nodes[0].node.list_channels().len(), 1);
4391         check_added_monitors!(nodes[0], 1);
4392
4393         nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: InitFeatures::empty() });
4394         let reestablish_1 = get_chan_reestablish_msgs!(nodes[0], nodes[1]);
4395         nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: InitFeatures::empty() });
4396         let reestablish_2 = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
4397
4398         nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &reestablish_1[0]);
4399         assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
4400         nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &reestablish_2[0]);
4401         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
4402
4403         let (funding_locked, _) = create_chan_between_nodes_with_value_confirm(&nodes[0], &nodes[1], &tx);
4404         let (announcement, as_update, bs_update) = create_chan_between_nodes_with_value_b(&nodes[0], &nodes[1], &funding_locked);
4405         for node in nodes.iter() {
4406                 assert!(node.net_graph_msg_handler.handle_channel_announcement(&announcement).unwrap());
4407                 node.net_graph_msg_handler.handle_channel_update(&as_update).unwrap();
4408                 node.net_graph_msg_handler.handle_channel_update(&bs_update).unwrap();
4409         }
4410
4411         send_payment(&nodes[0], &[&nodes[1]], 1000000);
4412 }
4413
4414 #[test]
4415 fn test_simple_manager_serialize_deserialize() {
4416         let chanmon_cfgs = create_chanmon_cfgs(2);
4417         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
4418         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
4419         let logger: test_utils::TestLogger;
4420         let fee_estimator: test_utils::TestFeeEstimator;
4421         let persister: test_utils::TestPersister;
4422         let new_chain_monitor: test_utils::TestChainMonitor;
4423         let nodes_0_deserialized: ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
4424         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
4425         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
4426
4427         let (our_payment_preimage, _, _) = route_payment(&nodes[0], &[&nodes[1]], 1000000);
4428         let (_, our_payment_hash, _) = route_payment(&nodes[0], &[&nodes[1]], 1000000);
4429
4430         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
4431
4432         let nodes_0_serialized = nodes[0].node.encode();
4433         let mut chan_0_monitor_serialized = test_utils::TestVecWriter(Vec::new());
4434         nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap().iter().next().unwrap().1.write(&mut chan_0_monitor_serialized).unwrap();
4435
4436         logger = test_utils::TestLogger::new();
4437         fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(253) };
4438         persister = test_utils::TestPersister::new();
4439         let keys_manager = &chanmon_cfgs[0].keys_manager;
4440         new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[0].chain_source), nodes[0].tx_broadcaster.clone(), &logger, &fee_estimator, &persister, keys_manager);
4441         nodes[0].chain_monitor = &new_chain_monitor;
4442         let mut chan_0_monitor_read = &chan_0_monitor_serialized.0[..];
4443         let (_, mut chan_0_monitor) = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(
4444                 &mut chan_0_monitor_read, keys_manager).unwrap();
4445         assert!(chan_0_monitor_read.is_empty());
4446
4447         let mut nodes_0_read = &nodes_0_serialized[..];
4448         let (_, nodes_0_deserialized_tmp) = {
4449                 let mut channel_monitors = HashMap::new();
4450                 channel_monitors.insert(chan_0_monitor.get_funding_txo().0, &mut chan_0_monitor);
4451                 <(BlockHash, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
4452                         default_config: UserConfig::default(),
4453                         keys_manager,
4454                         fee_estimator: &fee_estimator,
4455                         chain_monitor: nodes[0].chain_monitor,
4456                         tx_broadcaster: nodes[0].tx_broadcaster.clone(),
4457                         logger: &logger,
4458                         channel_monitors,
4459                 }).unwrap()
4460         };
4461         nodes_0_deserialized = nodes_0_deserialized_tmp;
4462         assert!(nodes_0_read.is_empty());
4463
4464         assert!(nodes[0].chain_monitor.watch_channel(chan_0_monitor.get_funding_txo().0, chan_0_monitor).is_ok());
4465         nodes[0].node = &nodes_0_deserialized;
4466         check_added_monitors!(nodes[0], 1);
4467
4468         reconnect_nodes(&nodes[0], &nodes[1], (false, false), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
4469
4470         fail_payment(&nodes[0], &[&nodes[1]], our_payment_hash);
4471         claim_payment(&nodes[0], &[&nodes[1]], our_payment_preimage);
4472 }
4473
4474 #[test]
4475 fn test_manager_serialize_deserialize_inconsistent_monitor() {
4476         // Test deserializing a ChannelManager with an out-of-date ChannelMonitor
4477         let chanmon_cfgs = create_chanmon_cfgs(4);
4478         let node_cfgs = create_node_cfgs(4, &chanmon_cfgs);
4479         let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs, &[None, None, None, None]);
4480         let logger: test_utils::TestLogger;
4481         let fee_estimator: test_utils::TestFeeEstimator;
4482         let persister: test_utils::TestPersister;
4483         let new_chain_monitor: test_utils::TestChainMonitor;
4484         let nodes_0_deserialized: ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
4485         let mut nodes = create_network(4, &node_cfgs, &node_chanmgrs);
4486         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
4487         create_announced_chan_between_nodes(&nodes, 2, 0, InitFeatures::known(), InitFeatures::known());
4488         let (_, _, channel_id, funding_tx) = create_announced_chan_between_nodes(&nodes, 0, 3, InitFeatures::known(), InitFeatures::known());
4489
4490         let mut node_0_stale_monitors_serialized = Vec::new();
4491         for monitor in nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap().iter() {
4492                 let mut writer = test_utils::TestVecWriter(Vec::new());
4493                 monitor.1.write(&mut writer).unwrap();
4494                 node_0_stale_monitors_serialized.push(writer.0);
4495         }
4496
4497         let (our_payment_preimage, _, _) = route_payment(&nodes[2], &[&nodes[0], &nodes[1]], 1000000);
4498
4499         // Serialize the ChannelManager here, but the monitor we keep up-to-date
4500         let nodes_0_serialized = nodes[0].node.encode();
4501
4502         route_payment(&nodes[0], &[&nodes[3]], 1000000);
4503         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
4504         nodes[2].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
4505         nodes[3].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
4506
4507         // Now the ChannelMonitor (which is now out-of-sync with ChannelManager for channel w/
4508         // nodes[3])
4509         let mut node_0_monitors_serialized = Vec::new();
4510         for monitor in nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap().iter() {
4511                 let mut writer = test_utils::TestVecWriter(Vec::new());
4512                 monitor.1.write(&mut writer).unwrap();
4513                 node_0_monitors_serialized.push(writer.0);
4514         }
4515
4516         logger = test_utils::TestLogger::new();
4517         fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(253) };
4518         persister = test_utils::TestPersister::new();
4519         let keys_manager = &chanmon_cfgs[0].keys_manager;
4520         new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[0].chain_source), nodes[0].tx_broadcaster.clone(), &logger, &fee_estimator, &persister, keys_manager);
4521         nodes[0].chain_monitor = &new_chain_monitor;
4522
4523
4524         let mut node_0_stale_monitors = Vec::new();
4525         for serialized in node_0_stale_monitors_serialized.iter() {
4526                 let mut read = &serialized[..];
4527                 let (_, monitor) = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(&mut read, keys_manager).unwrap();
4528                 assert!(read.is_empty());
4529                 node_0_stale_monitors.push(monitor);
4530         }
4531
4532         let mut node_0_monitors = Vec::new();
4533         for serialized in node_0_monitors_serialized.iter() {
4534                 let mut read = &serialized[..];
4535                 let (_, monitor) = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(&mut read, keys_manager).unwrap();
4536                 assert!(read.is_empty());
4537                 node_0_monitors.push(monitor);
4538         }
4539
4540         let mut nodes_0_read = &nodes_0_serialized[..];
4541         if let Err(msgs::DecodeError::InvalidValue) =
4542                 <(BlockHash, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
4543                 default_config: UserConfig::default(),
4544                 keys_manager,
4545                 fee_estimator: &fee_estimator,
4546                 chain_monitor: nodes[0].chain_monitor,
4547                 tx_broadcaster: nodes[0].tx_broadcaster.clone(),
4548                 logger: &logger,
4549                 channel_monitors: node_0_stale_monitors.iter_mut().map(|monitor| { (monitor.get_funding_txo().0, monitor) }).collect(),
4550         }) { } else {
4551                 panic!("If the monitor(s) are stale, this indicates a bug and we should get an Err return");
4552         };
4553
4554         let mut nodes_0_read = &nodes_0_serialized[..];
4555         let (_, nodes_0_deserialized_tmp) =
4556                 <(BlockHash, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
4557                 default_config: UserConfig::default(),
4558                 keys_manager,
4559                 fee_estimator: &fee_estimator,
4560                 chain_monitor: nodes[0].chain_monitor,
4561                 tx_broadcaster: nodes[0].tx_broadcaster.clone(),
4562                 logger: &logger,
4563                 channel_monitors: node_0_monitors.iter_mut().map(|monitor| { (monitor.get_funding_txo().0, monitor) }).collect(),
4564         }).unwrap();
4565         nodes_0_deserialized = nodes_0_deserialized_tmp;
4566         assert!(nodes_0_read.is_empty());
4567
4568         { // Channel close should result in a commitment tx
4569                 let txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
4570                 assert_eq!(txn.len(), 1);
4571                 check_spends!(txn[0], funding_tx);
4572                 assert_eq!(txn[0].input[0].previous_output.txid, funding_tx.txid());
4573         }
4574
4575         for monitor in node_0_monitors.drain(..) {
4576                 assert!(nodes[0].chain_monitor.watch_channel(monitor.get_funding_txo().0, monitor).is_ok());
4577                 check_added_monitors!(nodes[0], 1);
4578         }
4579         nodes[0].node = &nodes_0_deserialized;
4580         check_closed_event!(nodes[0], 1, ClosureReason::OutdatedChannelManager);
4581
4582         // nodes[1] and nodes[2] have no lost state with nodes[0]...
4583         reconnect_nodes(&nodes[0], &nodes[1], (false, false), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
4584         reconnect_nodes(&nodes[0], &nodes[2], (false, false), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
4585         //... and we can even still claim the payment!
4586         claim_payment(&nodes[2], &[&nodes[0], &nodes[1]], our_payment_preimage);
4587
4588         nodes[3].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: InitFeatures::empty() });
4589         let reestablish = get_event_msg!(nodes[3], MessageSendEvent::SendChannelReestablish, nodes[0].node.get_our_node_id());
4590         nodes[0].node.peer_connected(&nodes[3].node.get_our_node_id(), &msgs::Init { features: InitFeatures::empty() });
4591         nodes[0].node.handle_channel_reestablish(&nodes[3].node.get_our_node_id(), &reestablish);
4592         let msg_events = nodes[0].node.get_and_clear_pending_msg_events();
4593         assert_eq!(msg_events.len(), 1);
4594         if let MessageSendEvent::HandleError { ref action, .. } = msg_events[0] {
4595                 match action {
4596                         &ErrorAction::SendErrorMessage { ref msg } => {
4597                                 assert_eq!(msg.channel_id, channel_id);
4598                         },
4599                         _ => panic!("Unexpected event!"),
4600                 }
4601         }
4602 }
4603
4604 macro_rules! check_spendable_outputs {
4605         ($node: expr, $keysinterface: expr) => {
4606                 {
4607                         let mut events = $node.chain_monitor.chain_monitor.get_and_clear_pending_events();
4608                         let mut txn = Vec::new();
4609                         let mut all_outputs = Vec::new();
4610                         let secp_ctx = Secp256k1::new();
4611                         for event in events.drain(..) {
4612                                 match event {
4613                                         Event::SpendableOutputs { mut outputs } => {
4614                                                 for outp in outputs.drain(..) {
4615                                                         txn.push($keysinterface.backing.spend_spendable_outputs(&[&outp], Vec::new(), Builder::new().push_opcode(opcodes::all::OP_RETURN).into_script(), 253, &secp_ctx).unwrap());
4616                                                         all_outputs.push(outp);
4617                                                 }
4618                                         },
4619                                         _ => panic!("Unexpected event"),
4620                                 };
4621                         }
4622                         if all_outputs.len() > 1 {
4623                                 if let Ok(tx) = $keysinterface.backing.spend_spendable_outputs(&all_outputs.iter().map(|a| a).collect::<Vec<_>>(), Vec::new(), Builder::new().push_opcode(opcodes::all::OP_RETURN).into_script(), 253, &secp_ctx) {
4624                                         txn.push(tx);
4625                                 }
4626                         }
4627                         txn
4628                 }
4629         }
4630 }
4631
4632 #[test]
4633 fn test_claim_sizeable_push_msat() {
4634         // Incidentally test SpendableOutput event generation due to detection of to_local output on commitment tx
4635         let chanmon_cfgs = create_chanmon_cfgs(2);
4636         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
4637         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
4638         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
4639
4640         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 99000000, InitFeatures::known(), InitFeatures::known());
4641         nodes[1].node.force_close_channel(&chan.2).unwrap();
4642         check_closed_broadcast!(nodes[1], true);
4643         check_added_monitors!(nodes[1], 1);
4644         check_closed_event!(nodes[1], 1, ClosureReason::HolderForceClosed);
4645         let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
4646         assert_eq!(node_txn.len(), 1);
4647         check_spends!(node_txn[0], chan.3);
4648         assert_eq!(node_txn[0].output.len(), 2); // We can't force trimming of to_remote output as channel_reserve_satoshis block us to do so at channel opening
4649
4650         mine_transaction(&nodes[1], &node_txn[0]);
4651         connect_blocks(&nodes[1], BREAKDOWN_TIMEOUT as u32 - 1);
4652
4653         let spend_txn = check_spendable_outputs!(nodes[1], node_cfgs[1].keys_manager);
4654         assert_eq!(spend_txn.len(), 1);
4655         assert_eq!(spend_txn[0].input.len(), 1);
4656         check_spends!(spend_txn[0], node_txn[0]);
4657         assert_eq!(spend_txn[0].input[0].sequence, BREAKDOWN_TIMEOUT as u32);
4658 }
4659
4660 #[test]
4661 fn test_claim_on_remote_sizeable_push_msat() {
4662         // Same test as previous, just test on remote commitment tx, as per_commitment_point registration changes following you're funder/fundee and
4663         // to_remote output is encumbered by a P2WPKH
4664         let chanmon_cfgs = create_chanmon_cfgs(2);
4665         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
4666         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
4667         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
4668
4669         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 99000000, InitFeatures::known(), InitFeatures::known());
4670         nodes[0].node.force_close_channel(&chan.2).unwrap();
4671         check_closed_broadcast!(nodes[0], true);
4672         check_added_monitors!(nodes[0], 1);
4673         check_closed_event!(nodes[0], 1, ClosureReason::HolderForceClosed);
4674
4675         let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
4676         assert_eq!(node_txn.len(), 1);
4677         check_spends!(node_txn[0], chan.3);
4678         assert_eq!(node_txn[0].output.len(), 2); // We can't force trimming of to_remote output as channel_reserve_satoshis block us to do so at channel opening
4679
4680         mine_transaction(&nodes[1], &node_txn[0]);
4681         check_closed_broadcast!(nodes[1], true);
4682         check_added_monitors!(nodes[1], 1);
4683         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
4684         connect_blocks(&nodes[1], ANTI_REORG_DELAY - 1);
4685
4686         let spend_txn = check_spendable_outputs!(nodes[1], node_cfgs[1].keys_manager);
4687         assert_eq!(spend_txn.len(), 1);
4688         check_spends!(spend_txn[0], node_txn[0]);
4689 }
4690
4691 #[test]
4692 fn test_claim_on_remote_revoked_sizeable_push_msat() {
4693         // Same test as previous, just test on remote revoked commitment tx, as per_commitment_point registration changes following you're funder/fundee and
4694         // to_remote output is encumbered by a P2WPKH
4695
4696         let chanmon_cfgs = create_chanmon_cfgs(2);
4697         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
4698         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
4699         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
4700
4701         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 59000000, InitFeatures::known(), InitFeatures::known());
4702         let payment_preimage = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
4703         let revoked_local_txn = get_local_commitment_txn!(nodes[0], chan.2);
4704         assert_eq!(revoked_local_txn[0].input.len(), 1);
4705         assert_eq!(revoked_local_txn[0].input[0].previous_output.txid, chan.3.txid());
4706
4707         claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage);
4708         mine_transaction(&nodes[1], &revoked_local_txn[0]);
4709         check_closed_broadcast!(nodes[1], true);
4710         check_added_monitors!(nodes[1], 1);
4711         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
4712
4713         let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
4714         mine_transaction(&nodes[1], &node_txn[0]);
4715         connect_blocks(&nodes[1], ANTI_REORG_DELAY - 1);
4716
4717         let spend_txn = check_spendable_outputs!(nodes[1], node_cfgs[1].keys_manager);
4718         assert_eq!(spend_txn.len(), 3);
4719         check_spends!(spend_txn[0], revoked_local_txn[0]); // to_remote output on revoked remote commitment_tx
4720         check_spends!(spend_txn[1], node_txn[0]);
4721         check_spends!(spend_txn[2], revoked_local_txn[0], node_txn[0]); // Both outputs
4722 }
4723
4724 #[test]
4725 fn test_static_spendable_outputs_preimage_tx() {
4726         let chanmon_cfgs = create_chanmon_cfgs(2);
4727         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
4728         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
4729         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
4730
4731         // Create some initial channels
4732         let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
4733
4734         let payment_preimage = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
4735
4736         let commitment_tx = get_local_commitment_txn!(nodes[0], chan_1.2);
4737         assert_eq!(commitment_tx[0].input.len(), 1);
4738         assert_eq!(commitment_tx[0].input[0].previous_output.txid, chan_1.3.txid());
4739
4740         // Settle A's commitment tx on B's chain
4741         assert!(nodes[1].node.claim_funds(payment_preimage));
4742         check_added_monitors!(nodes[1], 1);
4743         mine_transaction(&nodes[1], &commitment_tx[0]);
4744         check_added_monitors!(nodes[1], 1);
4745         let events = nodes[1].node.get_and_clear_pending_msg_events();
4746         match events[0] {
4747                 MessageSendEvent::UpdateHTLCs { .. } => {},
4748                 _ => panic!("Unexpected event"),
4749         }
4750         match events[1] {
4751                 MessageSendEvent::BroadcastChannelUpdate { .. } => {},
4752                 _ => panic!("Unexepected event"),
4753         }
4754
4755         // Check B's monitor was able to send back output descriptor event for preimage tx on A's commitment tx
4756         let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap(); // ChannelManager : 2 (local commitment tx + HTLC-Success), ChannelMonitor: preimage tx
4757         assert_eq!(node_txn.len(), 3);
4758         check_spends!(node_txn[0], commitment_tx[0]);
4759         assert_eq!(node_txn[0].input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
4760         check_spends!(node_txn[1], chan_1.3);
4761         check_spends!(node_txn[2], node_txn[1]);
4762
4763         mine_transaction(&nodes[1], &node_txn[0]);
4764         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
4765         connect_blocks(&nodes[1], ANTI_REORG_DELAY - 1);
4766
4767         let spend_txn = check_spendable_outputs!(nodes[1], node_cfgs[1].keys_manager);
4768         assert_eq!(spend_txn.len(), 1);
4769         check_spends!(spend_txn[0], node_txn[0]);
4770 }
4771
4772 #[test]
4773 fn test_static_spendable_outputs_timeout_tx() {
4774         let chanmon_cfgs = create_chanmon_cfgs(2);
4775         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
4776         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
4777         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
4778
4779         // Create some initial channels
4780         let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
4781
4782         // Rebalance the network a bit by relaying one payment through all the channels ...
4783         send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
4784
4785         let (_, our_payment_hash, _) = route_payment(&nodes[1], &vec!(&nodes[0])[..], 3_000_000);
4786
4787         let commitment_tx = get_local_commitment_txn!(nodes[0], chan_1.2);
4788         assert_eq!(commitment_tx[0].input.len(), 1);
4789         assert_eq!(commitment_tx[0].input[0].previous_output.txid, chan_1.3.txid());
4790
4791         // Settle A's commitment tx on B' chain
4792         mine_transaction(&nodes[1], &commitment_tx[0]);
4793         check_added_monitors!(nodes[1], 1);
4794         let events = nodes[1].node.get_and_clear_pending_msg_events();
4795         match events[0] {
4796                 MessageSendEvent::BroadcastChannelUpdate { .. } => {},
4797                 _ => panic!("Unexpected event"),
4798         }
4799         connect_blocks(&nodes[1], TEST_FINAL_CLTV - 1); // Confirm blocks until the HTLC expires
4800
4801         // Check B's monitor was able to send back output descriptor event for timeout tx on A's commitment tx
4802         let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap().split_off(0);
4803         assert_eq!(node_txn.len(), 2); // ChannelManager : 1 local commitent tx, ChannelMonitor: timeout tx
4804         check_spends!(node_txn[0], chan_1.3.clone());
4805         check_spends!(node_txn[1],  commitment_tx[0].clone());
4806         assert_eq!(node_txn[1].input[0].witness.last().unwrap().len(), ACCEPTED_HTLC_SCRIPT_WEIGHT);
4807
4808         mine_transaction(&nodes[1], &node_txn[1]);
4809         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
4810         connect_blocks(&nodes[1], ANTI_REORG_DELAY - 1);
4811         expect_payment_failed!(nodes[1], our_payment_hash, true);
4812
4813         let spend_txn = check_spendable_outputs!(nodes[1], node_cfgs[1].keys_manager);
4814         assert_eq!(spend_txn.len(), 3); // SpendableOutput: remote_commitment_tx.to_remote, timeout_tx.output
4815         check_spends!(spend_txn[0], commitment_tx[0]);
4816         check_spends!(spend_txn[1], node_txn[1]);
4817         check_spends!(spend_txn[2], node_txn[1], commitment_tx[0]); // All outputs
4818 }
4819
4820 #[test]
4821 fn test_static_spendable_outputs_justice_tx_revoked_commitment_tx() {
4822         let chanmon_cfgs = create_chanmon_cfgs(2);
4823         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
4824         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
4825         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
4826
4827         // Create some initial channels
4828         let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
4829
4830         let payment_preimage = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
4831         let revoked_local_txn = get_local_commitment_txn!(nodes[0], chan_1.2);
4832         assert_eq!(revoked_local_txn[0].input.len(), 1);
4833         assert_eq!(revoked_local_txn[0].input[0].previous_output.txid, chan_1.3.txid());
4834
4835         claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage);
4836
4837         mine_transaction(&nodes[1], &revoked_local_txn[0]);
4838         check_closed_broadcast!(nodes[1], true);
4839         check_added_monitors!(nodes[1], 1);
4840         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
4841
4842         let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
4843         assert_eq!(node_txn.len(), 2);
4844         assert_eq!(node_txn[0].input.len(), 2);
4845         check_spends!(node_txn[0], revoked_local_txn[0]);
4846
4847         mine_transaction(&nodes[1], &node_txn[0]);
4848         connect_blocks(&nodes[1], ANTI_REORG_DELAY - 1);
4849
4850         let spend_txn = check_spendable_outputs!(nodes[1], node_cfgs[1].keys_manager);
4851         assert_eq!(spend_txn.len(), 1);
4852         check_spends!(spend_txn[0], node_txn[0]);
4853 }
4854
4855 #[test]
4856 fn test_static_spendable_outputs_justice_tx_revoked_htlc_timeout_tx() {
4857         let mut chanmon_cfgs = create_chanmon_cfgs(2);
4858         chanmon_cfgs[0].keys_manager.disable_revocation_policy_check = true;
4859         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
4860         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
4861         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
4862
4863         // Create some initial channels
4864         let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
4865
4866         let payment_preimage = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
4867         let revoked_local_txn = get_local_commitment_txn!(nodes[0], chan_1.2);
4868         assert_eq!(revoked_local_txn[0].input.len(), 1);
4869         assert_eq!(revoked_local_txn[0].input[0].previous_output.txid, chan_1.3.txid());
4870
4871         claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage);
4872
4873         // A will generate HTLC-Timeout from revoked commitment tx
4874         mine_transaction(&nodes[0], &revoked_local_txn[0]);
4875         check_closed_broadcast!(nodes[0], true);
4876         check_added_monitors!(nodes[0], 1);
4877         check_closed_event!(nodes[0], 1, ClosureReason::CommitmentTxConfirmed);
4878         connect_blocks(&nodes[0], TEST_FINAL_CLTV - 1); // Confirm blocks until the HTLC expires
4879
4880         let revoked_htlc_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
4881         assert_eq!(revoked_htlc_txn.len(), 2);
4882         check_spends!(revoked_htlc_txn[0], chan_1.3);
4883         assert_eq!(revoked_htlc_txn[1].input.len(), 1);
4884         assert_eq!(revoked_htlc_txn[1].input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
4885         check_spends!(revoked_htlc_txn[1], revoked_local_txn[0]);
4886         assert_ne!(revoked_htlc_txn[1].lock_time, 0); // HTLC-Timeout
4887
4888         // B will generate justice tx from A's revoked commitment/HTLC tx
4889         let header = BlockHeader { version: 0x20000000, prev_blockhash: nodes[1].best_block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
4890         connect_block(&nodes[1], &Block { header, txdata: vec![revoked_local_txn[0].clone(), revoked_htlc_txn[1].clone()] });
4891         check_closed_broadcast!(nodes[1], true);
4892         check_added_monitors!(nodes[1], 1);
4893         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
4894
4895         let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
4896         assert_eq!(node_txn.len(), 3); // ChannelMonitor: bogus justice tx, justice tx on revoked outputs, ChannelManager: local commitment tx
4897         // The first transaction generated is bogus - it spends both outputs of revoked_local_txn[0]
4898         // including the one already spent by revoked_htlc_txn[1]. That's OK, we'll spend with valid
4899         // transactions next...
4900         assert_eq!(node_txn[0].input.len(), 3);
4901         check_spends!(node_txn[0], revoked_local_txn[0], revoked_htlc_txn[1]);
4902
4903         assert_eq!(node_txn[1].input.len(), 2);
4904         check_spends!(node_txn[1], revoked_local_txn[0], revoked_htlc_txn[1]);
4905         if node_txn[1].input[1].previous_output.txid == revoked_htlc_txn[1].txid() {
4906                 assert_ne!(node_txn[1].input[0].previous_output, revoked_htlc_txn[1].input[0].previous_output);
4907         } else {
4908                 assert_eq!(node_txn[1].input[0].previous_output.txid, revoked_htlc_txn[1].txid());
4909                 assert_ne!(node_txn[1].input[1].previous_output, revoked_htlc_txn[1].input[0].previous_output);
4910         }
4911
4912         assert_eq!(node_txn[2].input.len(), 1);
4913         check_spends!(node_txn[2], chan_1.3);
4914
4915         mine_transaction(&nodes[1], &node_txn[1]);
4916         connect_blocks(&nodes[1], ANTI_REORG_DELAY - 1);
4917
4918         // Check B's ChannelMonitor was able to generate the right spendable output descriptor
4919         let spend_txn = check_spendable_outputs!(nodes[1], node_cfgs[1].keys_manager);
4920         assert_eq!(spend_txn.len(), 1);
4921         assert_eq!(spend_txn[0].input.len(), 1);
4922         check_spends!(spend_txn[0], node_txn[1]);
4923 }
4924
4925 #[test]
4926 fn test_static_spendable_outputs_justice_tx_revoked_htlc_success_tx() {
4927         let mut chanmon_cfgs = create_chanmon_cfgs(2);
4928         chanmon_cfgs[1].keys_manager.disable_revocation_policy_check = true;
4929         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
4930         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
4931         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
4932
4933         // Create some initial channels
4934         let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
4935
4936         let payment_preimage = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
4937         let revoked_local_txn = get_local_commitment_txn!(nodes[1], chan_1.2);
4938         assert_eq!(revoked_local_txn[0].input.len(), 1);
4939         assert_eq!(revoked_local_txn[0].input[0].previous_output.txid, chan_1.3.txid());
4940
4941         // The to-be-revoked commitment tx should have one HTLC and one to_remote output
4942         assert_eq!(revoked_local_txn[0].output.len(), 2);
4943
4944         claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage);
4945
4946         // B will generate HTLC-Success from revoked commitment tx
4947         mine_transaction(&nodes[1], &revoked_local_txn[0]);
4948         check_closed_broadcast!(nodes[1], true);
4949         check_added_monitors!(nodes[1], 1);
4950         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
4951         let revoked_htlc_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
4952
4953         assert_eq!(revoked_htlc_txn.len(), 2);
4954         assert_eq!(revoked_htlc_txn[0].input.len(), 1);
4955         assert_eq!(revoked_htlc_txn[0].input[0].witness.last().unwrap().len(), ACCEPTED_HTLC_SCRIPT_WEIGHT);
4956         check_spends!(revoked_htlc_txn[0], revoked_local_txn[0]);
4957
4958         // Check that the unspent (of two) outputs on revoked_local_txn[0] is a P2WPKH:
4959         let unspent_local_txn_output = revoked_htlc_txn[0].input[0].previous_output.vout as usize ^ 1;
4960         assert_eq!(revoked_local_txn[0].output[unspent_local_txn_output].script_pubkey.len(), 2 + 20); // P2WPKH
4961
4962         // A will generate justice tx from B's revoked commitment/HTLC tx
4963         let header = BlockHeader { version: 0x20000000, prev_blockhash: nodes[0].best_block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
4964         connect_block(&nodes[0], &Block { header, txdata: vec![revoked_local_txn[0].clone(), revoked_htlc_txn[0].clone()] });
4965         check_closed_broadcast!(nodes[0], true);
4966         check_added_monitors!(nodes[0], 1);
4967         check_closed_event!(nodes[0], 1, ClosureReason::CommitmentTxConfirmed);
4968
4969         let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
4970         assert_eq!(node_txn.len(), 3); // ChannelMonitor: justice tx on revoked commitment, justice tx on revoked HTLC-success, ChannelManager: local commitment tx
4971
4972         // The first transaction generated is bogus - it spends both outputs of revoked_local_txn[0]
4973         // including the one already spent by revoked_htlc_txn[0]. That's OK, we'll spend with valid
4974         // transactions next...
4975         assert_eq!(node_txn[0].input.len(), 2);
4976         check_spends!(node_txn[0], revoked_local_txn[0], revoked_htlc_txn[0]);
4977         if node_txn[0].input[1].previous_output.txid == revoked_htlc_txn[0].txid() {
4978                 assert_eq!(node_txn[0].input[0].previous_output, revoked_htlc_txn[0].input[0].previous_output);
4979         } else {
4980                 assert_eq!(node_txn[0].input[0].previous_output.txid, revoked_htlc_txn[0].txid());
4981                 assert_eq!(node_txn[0].input[1].previous_output, revoked_htlc_txn[0].input[0].previous_output);
4982         }
4983
4984         assert_eq!(node_txn[1].input.len(), 1);
4985         check_spends!(node_txn[1], revoked_htlc_txn[0]);
4986
4987         check_spends!(node_txn[2], chan_1.3);
4988
4989         mine_transaction(&nodes[0], &node_txn[1]);
4990         connect_blocks(&nodes[0], ANTI_REORG_DELAY - 1);
4991
4992         // Note that nodes[0]'s tx_broadcaster is still locked, so if we get here the channelmonitor
4993         // didn't try to generate any new transactions.
4994
4995         // Check A's ChannelMonitor was able to generate the right spendable output descriptor
4996         let spend_txn = check_spendable_outputs!(nodes[0], node_cfgs[0].keys_manager);
4997         assert_eq!(spend_txn.len(), 3);
4998         assert_eq!(spend_txn[0].input.len(), 1);
4999         check_spends!(spend_txn[0], revoked_local_txn[0]); // spending to_remote output from revoked local tx
5000         assert_ne!(spend_txn[0].input[0].previous_output, revoked_htlc_txn[0].input[0].previous_output);
5001         check_spends!(spend_txn[1], node_txn[1]); // spending justice tx output on the htlc success tx
5002         check_spends!(spend_txn[2], revoked_local_txn[0], node_txn[1]); // Both outputs
5003 }
5004
5005 #[test]
5006 fn test_onchain_to_onchain_claim() {
5007         // Test that in case of channel closure, we detect the state of output and claim HTLC
5008         // on downstream peer's remote commitment tx.
5009         // First, have C claim an HTLC against its own latest commitment transaction.
5010         // Then, broadcast these to B, which should update the monitor downstream on the A<->B
5011         // channel.
5012         // Finally, check that B will claim the HTLC output if A's latest commitment transaction
5013         // gets broadcast.
5014
5015         let chanmon_cfgs = create_chanmon_cfgs(3);
5016         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
5017         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
5018         let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
5019
5020         // Create some initial channels
5021         let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
5022         let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2, InitFeatures::known(), InitFeatures::known());
5023
5024         // Ensure all nodes are at the same height
5025         let node_max_height = nodes.iter().map(|node| node.blocks.lock().unwrap().len()).max().unwrap() as u32;
5026         connect_blocks(&nodes[0], node_max_height - nodes[0].best_block_info().1);
5027         connect_blocks(&nodes[1], node_max_height - nodes[1].best_block_info().1);
5028         connect_blocks(&nodes[2], node_max_height - nodes[2].best_block_info().1);
5029
5030         // Rebalance the network a bit by relaying one payment through all the channels ...
5031         send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 8000000);
5032         send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 8000000);
5033
5034         let (payment_preimage, _payment_hash, _payment_secret) = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), 3000000);
5035         let commitment_tx = get_local_commitment_txn!(nodes[2], chan_2.2);
5036         check_spends!(commitment_tx[0], chan_2.3);
5037         nodes[2].node.claim_funds(payment_preimage);
5038         check_added_monitors!(nodes[2], 1);
5039         let updates = get_htlc_update_msgs!(nodes[2], nodes[1].node.get_our_node_id());
5040         assert!(updates.update_add_htlcs.is_empty());
5041         assert!(updates.update_fail_htlcs.is_empty());
5042         assert_eq!(updates.update_fulfill_htlcs.len(), 1);
5043         assert!(updates.update_fail_malformed_htlcs.is_empty());
5044
5045         mine_transaction(&nodes[2], &commitment_tx[0]);
5046         check_closed_broadcast!(nodes[2], true);
5047         check_added_monitors!(nodes[2], 1);
5048         check_closed_event!(nodes[2], 1, ClosureReason::CommitmentTxConfirmed);
5049
5050         let c_txn = nodes[2].tx_broadcaster.txn_broadcasted.lock().unwrap().clone(); // ChannelManager : 2 (commitment tx, HTLC-Success tx), ChannelMonitor : 1 (HTLC-Success tx)
5051         assert_eq!(c_txn.len(), 3);
5052         assert_eq!(c_txn[0], c_txn[2]);
5053         assert_eq!(commitment_tx[0], c_txn[1]);
5054         check_spends!(c_txn[1], chan_2.3);
5055         check_spends!(c_txn[2], c_txn[1]);
5056         assert_eq!(c_txn[1].input[0].witness.clone().last().unwrap().len(), 71);
5057         assert_eq!(c_txn[2].input[0].witness.clone().last().unwrap().len(), ACCEPTED_HTLC_SCRIPT_WEIGHT);
5058         assert!(c_txn[0].output[0].script_pubkey.is_v0_p2wsh()); // revokeable output
5059         assert_eq!(c_txn[0].lock_time, 0); // Success tx
5060
5061         // So we broadcast C's commitment tx and HTLC-Success on B's chain, we should successfully be able to extract preimage and update downstream monitor
5062         let header = BlockHeader { version: 0x20000000, prev_blockhash: nodes[1].best_block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42};
5063         connect_block(&nodes[1], &Block { header, txdata: vec![c_txn[1].clone(), c_txn[2].clone()]});
5064         check_added_monitors!(nodes[1], 1);
5065         let events = nodes[1].node.get_and_clear_pending_events();
5066         assert_eq!(events.len(), 2);
5067         match events[0] {
5068                 Event::ChannelClosed { reason: ClosureReason::CommitmentTxConfirmed, .. } => {}
5069                 _ => panic!("Unexpected event"),
5070         }
5071         match events[1] {
5072                 Event::PaymentForwarded { fee_earned_msat, claim_from_onchain_tx } => {
5073                         assert_eq!(fee_earned_msat, Some(1000));
5074                         assert_eq!(claim_from_onchain_tx, true);
5075                 },
5076                 _ => panic!("Unexpected event"),
5077         }
5078         {
5079                 let mut b_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
5080                 // ChannelMonitor: claim tx
5081                 assert_eq!(b_txn.len(), 1);
5082                 check_spends!(b_txn[0], chan_2.3); // B local commitment tx, issued by ChannelManager
5083                 b_txn.clear();
5084         }
5085         check_added_monitors!(nodes[1], 1);
5086         let msg_events = nodes[1].node.get_and_clear_pending_msg_events();
5087         assert_eq!(msg_events.len(), 3);
5088         match msg_events[0] {
5089                 MessageSendEvent::BroadcastChannelUpdate { .. } => {},
5090                 _ => panic!("Unexpected event"),
5091         }
5092         match msg_events[1] {
5093                 MessageSendEvent::HandleError { action: ErrorAction::SendErrorMessage { .. }, node_id: _ } => {},
5094                 _ => panic!("Unexpected event"),
5095         }
5096         match msg_events[2] {
5097                 MessageSendEvent::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, .. } } => {
5098                         assert!(update_add_htlcs.is_empty());
5099                         assert!(update_fail_htlcs.is_empty());
5100                         assert_eq!(update_fulfill_htlcs.len(), 1);
5101                         assert!(update_fail_malformed_htlcs.is_empty());
5102                         assert_eq!(nodes[0].node.get_our_node_id(), *node_id);
5103                 },
5104                 _ => panic!("Unexpected event"),
5105         };
5106         // Broadcast A's commitment tx on B's chain to see if we are able to claim inbound HTLC with our HTLC-Success tx
5107         let commitment_tx = get_local_commitment_txn!(nodes[0], chan_1.2);
5108         mine_transaction(&nodes[1], &commitment_tx[0]);
5109         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
5110         let b_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
5111         // ChannelMonitor: HTLC-Success tx, ChannelManager: local commitment tx + HTLC-Success tx
5112         assert_eq!(b_txn.len(), 3);
5113         check_spends!(b_txn[1], chan_1.3);
5114         check_spends!(b_txn[2], b_txn[1]);
5115         check_spends!(b_txn[0], commitment_tx[0]);
5116         assert_eq!(b_txn[0].input[0].witness.clone().last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
5117         assert!(b_txn[0].output[0].script_pubkey.is_v0_p2wpkh()); // direct payment
5118         assert_eq!(b_txn[0].lock_time, 0); // Success tx
5119
5120         check_closed_broadcast!(nodes[1], true);
5121         check_added_monitors!(nodes[1], 1);
5122 }
5123
5124 #[test]
5125 fn test_duplicate_payment_hash_one_failure_one_success() {
5126         // Topology : A --> B --> C --> D
5127         // We route 2 payments with same hash between B and C, one will be timeout, the other successfully claim
5128         // Note that because C will refuse to generate two payment secrets for the same payment hash,
5129         // we forward one of the payments onwards to D.
5130         let chanmon_cfgs = create_chanmon_cfgs(4);
5131         let node_cfgs = create_node_cfgs(4, &chanmon_cfgs);
5132         // When this test was written, the default base fee floated based on the HTLC count.
5133         // It is now fixed, so we simply set the fee to the expected value here.
5134         let mut config = test_default_channel_config();
5135         config.channel_options.forwarding_fee_base_msat = 196;
5136         let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs,
5137                 &[Some(config.clone()), Some(config.clone()), Some(config.clone()), Some(config.clone())]);
5138         let mut nodes = create_network(4, &node_cfgs, &node_chanmgrs);
5139
5140         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
5141         let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2, InitFeatures::known(), InitFeatures::known());
5142         create_announced_chan_between_nodes(&nodes, 2, 3, InitFeatures::known(), InitFeatures::known());
5143
5144         let node_max_height = nodes.iter().map(|node| node.blocks.lock().unwrap().len()).max().unwrap() as u32;
5145         connect_blocks(&nodes[0], node_max_height - nodes[0].best_block_info().1);
5146         connect_blocks(&nodes[1], node_max_height - nodes[1].best_block_info().1);
5147         connect_blocks(&nodes[2], node_max_height - nodes[2].best_block_info().1);
5148         connect_blocks(&nodes[3], node_max_height - nodes[3].best_block_info().1);
5149
5150         let (our_payment_preimage, duplicate_payment_hash, _) = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 900000);
5151
5152         let payment_secret = nodes[3].node.create_inbound_payment_for_hash(duplicate_payment_hash, None, 7200, 0).unwrap();
5153         // We reduce the final CLTV here by a somewhat arbitrary constant to keep it under the one-byte
5154         // script push size limit so that the below script length checks match
5155         // ACCEPTED_HTLC_SCRIPT_WEIGHT.
5156         let route = get_route(&nodes[0].node.get_our_node_id(), &nodes[0].net_graph_msg_handler.network_graph,
5157                 &nodes[3].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 900000, TEST_FINAL_CLTV - 40, nodes[0].logger).unwrap();
5158         send_along_route_with_secret(&nodes[0], route, &[&[&nodes[1], &nodes[2], &nodes[3]]], 900000, duplicate_payment_hash, payment_secret);
5159
5160         let commitment_txn = get_local_commitment_txn!(nodes[2], chan_2.2);
5161         assert_eq!(commitment_txn[0].input.len(), 1);
5162         check_spends!(commitment_txn[0], chan_2.3);
5163
5164         mine_transaction(&nodes[1], &commitment_txn[0]);
5165         check_closed_broadcast!(nodes[1], true);
5166         check_added_monitors!(nodes[1], 1);
5167         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
5168         connect_blocks(&nodes[1], TEST_FINAL_CLTV - 40 + MIN_CLTV_EXPIRY_DELTA as u32 - 1); // Confirm blocks until the HTLC expires
5169
5170         let htlc_timeout_tx;
5171         { // Extract one of the two HTLC-Timeout transaction
5172                 let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
5173                 // ChannelMonitor: timeout tx * 3, ChannelManager: local commitment tx
5174                 assert_eq!(node_txn.len(), 4);
5175                 check_spends!(node_txn[0], chan_2.3);
5176
5177                 check_spends!(node_txn[1], commitment_txn[0]);
5178                 assert_eq!(node_txn[1].input.len(), 1);
5179                 check_spends!(node_txn[2], commitment_txn[0]);
5180                 assert_eq!(node_txn[2].input.len(), 1);
5181                 assert_eq!(node_txn[1].input[0].previous_output, node_txn[2].input[0].previous_output);
5182                 check_spends!(node_txn[3], commitment_txn[0]);
5183                 assert_ne!(node_txn[1].input[0].previous_output, node_txn[3].input[0].previous_output);
5184
5185                 assert_eq!(node_txn[1].input[0].witness.last().unwrap().len(), ACCEPTED_HTLC_SCRIPT_WEIGHT);
5186                 assert_eq!(node_txn[2].input[0].witness.last().unwrap().len(), ACCEPTED_HTLC_SCRIPT_WEIGHT);
5187                 assert_eq!(node_txn[3].input[0].witness.last().unwrap().len(), ACCEPTED_HTLC_SCRIPT_WEIGHT);
5188                 htlc_timeout_tx = node_txn[1].clone();
5189         }
5190
5191         nodes[2].node.claim_funds(our_payment_preimage);
5192         mine_transaction(&nodes[2], &commitment_txn[0]);
5193         check_added_monitors!(nodes[2], 2);
5194         check_closed_event!(nodes[2], 1, ClosureReason::CommitmentTxConfirmed);
5195         let events = nodes[2].node.get_and_clear_pending_msg_events();
5196         match events[0] {
5197                 MessageSendEvent::UpdateHTLCs { .. } => {},
5198                 _ => panic!("Unexpected event"),
5199         }
5200         match events[1] {
5201                 MessageSendEvent::BroadcastChannelUpdate { .. } => {},
5202                 _ => panic!("Unexepected event"),
5203         }
5204         let htlc_success_txn: Vec<_> = nodes[2].tx_broadcaster.txn_broadcasted.lock().unwrap().clone();
5205         assert_eq!(htlc_success_txn.len(), 5); // ChannelMonitor: HTLC-Success txn (*2 due to 2-HTLC outputs), ChannelManager: local commitment tx + HTLC-Success txn (*2 due to 2-HTLC outputs)
5206         check_spends!(htlc_success_txn[0], commitment_txn[0]);
5207         check_spends!(htlc_success_txn[1], commitment_txn[0]);
5208         assert_eq!(htlc_success_txn[0].input.len(), 1);
5209         assert_eq!(htlc_success_txn[0].input[0].witness.last().unwrap().len(), ACCEPTED_HTLC_SCRIPT_WEIGHT);
5210         assert_eq!(htlc_success_txn[1].input.len(), 1);
5211         assert_eq!(htlc_success_txn[1].input[0].witness.last().unwrap().len(), ACCEPTED_HTLC_SCRIPT_WEIGHT);
5212         assert_ne!(htlc_success_txn[0].input[0].previous_output, htlc_success_txn[1].input[0].previous_output);
5213         assert_eq!(htlc_success_txn[2], commitment_txn[0]);
5214         assert_eq!(htlc_success_txn[3], htlc_success_txn[0]);
5215         assert_eq!(htlc_success_txn[4], htlc_success_txn[1]);
5216         assert_ne!(htlc_success_txn[0].input[0].previous_output, htlc_timeout_tx.input[0].previous_output);
5217
5218         mine_transaction(&nodes[1], &htlc_timeout_tx);
5219         connect_blocks(&nodes[1], ANTI_REORG_DELAY - 1);
5220         expect_pending_htlcs_forwardable!(nodes[1]);
5221         let htlc_updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
5222         assert!(htlc_updates.update_add_htlcs.is_empty());
5223         assert_eq!(htlc_updates.update_fail_htlcs.len(), 1);
5224         let first_htlc_id = htlc_updates.update_fail_htlcs[0].htlc_id;
5225         assert!(htlc_updates.update_fulfill_htlcs.is_empty());
5226         assert!(htlc_updates.update_fail_malformed_htlcs.is_empty());
5227         check_added_monitors!(nodes[1], 1);
5228
5229         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &htlc_updates.update_fail_htlcs[0]);
5230         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
5231         {
5232                 commitment_signed_dance!(nodes[0], nodes[1], &htlc_updates.commitment_signed, false, true);
5233         }
5234         expect_payment_failed_with_update!(nodes[0], duplicate_payment_hash, false, chan_2.0.contents.short_channel_id, true);
5235
5236         // Solve 2nd HTLC by broadcasting on B's chain HTLC-Success Tx from C
5237         // Note that the fee paid is effectively double as the HTLC value (including the nodes[1] fee
5238         // and nodes[2] fee) is rounded down and then claimed in full.
5239         mine_transaction(&nodes[1], &htlc_success_txn[0]);
5240         expect_payment_forwarded!(nodes[1], Some(196*2), true);
5241         let updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
5242         assert!(updates.update_add_htlcs.is_empty());
5243         assert!(updates.update_fail_htlcs.is_empty());
5244         assert_eq!(updates.update_fulfill_htlcs.len(), 1);
5245         assert_ne!(updates.update_fulfill_htlcs[0].htlc_id, first_htlc_id);
5246         assert!(updates.update_fail_malformed_htlcs.is_empty());
5247         check_added_monitors!(nodes[1], 1);
5248
5249         nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &updates.update_fulfill_htlcs[0]);
5250         commitment_signed_dance!(nodes[0], nodes[1], &updates.commitment_signed, false);
5251
5252         let events = nodes[0].node.get_and_clear_pending_events();
5253         match events[0] {
5254                 Event::PaymentSent { ref payment_preimage } => {
5255                         assert_eq!(*payment_preimage, our_payment_preimage);
5256                 }
5257                 _ => panic!("Unexpected event"),
5258         }
5259 }
5260
5261 #[test]
5262 fn test_dynamic_spendable_outputs_local_htlc_success_tx() {
5263         let chanmon_cfgs = create_chanmon_cfgs(2);
5264         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
5265         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
5266         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
5267
5268         // Create some initial channels
5269         let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
5270
5271         let payment_preimage = route_payment(&nodes[0], &vec!(&nodes[1])[..], 9000000).0;
5272         let local_txn = get_local_commitment_txn!(nodes[1], chan_1.2);
5273         assert_eq!(local_txn.len(), 1);
5274         assert_eq!(local_txn[0].input.len(), 1);
5275         check_spends!(local_txn[0], chan_1.3);
5276
5277         // Give B knowledge of preimage to be able to generate a local HTLC-Success Tx
5278         nodes[1].node.claim_funds(payment_preimage);
5279         check_added_monitors!(nodes[1], 1);
5280         mine_transaction(&nodes[1], &local_txn[0]);
5281         check_added_monitors!(nodes[1], 1);
5282         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
5283         let events = nodes[1].node.get_and_clear_pending_msg_events();
5284         match events[0] {
5285                 MessageSendEvent::UpdateHTLCs { .. } => {},
5286                 _ => panic!("Unexpected event"),
5287         }
5288         match events[1] {
5289                 MessageSendEvent::BroadcastChannelUpdate { .. } => {},
5290                 _ => panic!("Unexepected event"),
5291         }
5292         let node_tx = {
5293                 let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
5294                 assert_eq!(node_txn.len(), 3);
5295                 assert_eq!(node_txn[0], node_txn[2]);
5296                 assert_eq!(node_txn[1], local_txn[0]);
5297                 assert_eq!(node_txn[0].input.len(), 1);
5298                 assert_eq!(node_txn[0].input[0].witness.last().unwrap().len(), ACCEPTED_HTLC_SCRIPT_WEIGHT);
5299                 check_spends!(node_txn[0], local_txn[0]);
5300                 node_txn[0].clone()
5301         };
5302
5303         mine_transaction(&nodes[1], &node_tx);
5304         connect_blocks(&nodes[1], BREAKDOWN_TIMEOUT as u32 - 1);
5305
5306         // Verify that B is able to spend its own HTLC-Success tx thanks to spendable output event given back by its ChannelMonitor
5307         let spend_txn = check_spendable_outputs!(nodes[1], node_cfgs[1].keys_manager);
5308         assert_eq!(spend_txn.len(), 1);
5309         assert_eq!(spend_txn[0].input.len(), 1);
5310         check_spends!(spend_txn[0], node_tx);
5311         assert_eq!(spend_txn[0].input[0].sequence, BREAKDOWN_TIMEOUT as u32);
5312 }
5313
5314 fn do_test_fail_backwards_unrevoked_remote_announce(deliver_last_raa: bool, announce_latest: bool) {
5315         // Test that we fail backwards the full set of HTLCs we need to when remote broadcasts an
5316         // unrevoked commitment transaction.
5317         // This includes HTLCs which were below the dust threshold as well as HTLCs which were awaiting
5318         // a remote RAA before they could be failed backwards (and combinations thereof).
5319         // We also test duplicate-hash HTLCs by adding two nodes on each side of the target nodes which
5320         // use the same payment hashes.
5321         // Thus, we use a six-node network:
5322         //
5323         // A \         / E
5324         //    - C - D -
5325         // B /         \ F
5326         // And test where C fails back to A/B when D announces its latest commitment transaction
5327         let chanmon_cfgs = create_chanmon_cfgs(6);
5328         let node_cfgs = create_node_cfgs(6, &chanmon_cfgs);
5329         // When this test was written, the default base fee floated based on the HTLC count.
5330         // It is now fixed, so we simply set the fee to the expected value here.
5331         let mut config = test_default_channel_config();
5332         config.channel_options.forwarding_fee_base_msat = 196;
5333         let node_chanmgrs = create_node_chanmgrs(6, &node_cfgs,
5334                 &[Some(config.clone()), Some(config.clone()), Some(config.clone()), Some(config.clone()), Some(config.clone()), Some(config.clone())]);
5335         let nodes = create_network(6, &node_cfgs, &node_chanmgrs);
5336         let logger = test_utils::TestLogger::new();
5337
5338         create_announced_chan_between_nodes(&nodes, 0, 2, InitFeatures::known(), InitFeatures::known());
5339         create_announced_chan_between_nodes(&nodes, 1, 2, InitFeatures::known(), InitFeatures::known());
5340         let chan = create_announced_chan_between_nodes(&nodes, 2, 3, InitFeatures::known(), InitFeatures::known());
5341         create_announced_chan_between_nodes(&nodes, 3, 4, InitFeatures::known(), InitFeatures::known());
5342         create_announced_chan_between_nodes(&nodes, 3, 5, InitFeatures::known(), InitFeatures::known());
5343
5344         // Rebalance and check output sanity...
5345         send_payment(&nodes[0], &[&nodes[2], &nodes[3], &nodes[4]], 500000);
5346         send_payment(&nodes[1], &[&nodes[2], &nodes[3], &nodes[5]], 500000);
5347         assert_eq!(get_local_commitment_txn!(nodes[3], chan.2)[0].output.len(), 2);
5348
5349         let ds_dust_limit = nodes[3].node.channel_state.lock().unwrap().by_id.get(&chan.2).unwrap().holder_dust_limit_satoshis;
5350         // 0th HTLC:
5351         let (_, payment_hash_1, _) = route_payment(&nodes[0], &[&nodes[2], &nodes[3], &nodes[4]], ds_dust_limit*1000); // not added < dust limit + HTLC tx fee
5352         // 1st HTLC:
5353         let (_, payment_hash_2, _) = route_payment(&nodes[0], &[&nodes[2], &nodes[3], &nodes[4]], ds_dust_limit*1000); // not added < dust limit + HTLC tx fee
5354         let net_graph_msg_handler = &nodes[1].net_graph_msg_handler;
5355         let our_node_id = &nodes[1].node.get_our_node_id();
5356         let route = get_route(our_node_id, &net_graph_msg_handler.network_graph, &nodes[5].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), ds_dust_limit*1000, TEST_FINAL_CLTV, &logger).unwrap();
5357         // 2nd HTLC:
5358         send_along_route_with_secret(&nodes[1], route.clone(), &[&[&nodes[2], &nodes[3], &nodes[5]]], ds_dust_limit*1000, payment_hash_1, nodes[5].node.create_inbound_payment_for_hash(payment_hash_1, None, 7200, 0).unwrap()); // not added < dust limit + HTLC tx fee
5359         // 3rd HTLC:
5360         send_along_route_with_secret(&nodes[1], route, &[&[&nodes[2], &nodes[3], &nodes[5]]], ds_dust_limit*1000, payment_hash_2, nodes[5].node.create_inbound_payment_for_hash(payment_hash_2, None, 7200, 0).unwrap()); // not added < dust limit + HTLC tx fee
5361         // 4th HTLC:
5362         let (_, payment_hash_3, _) = route_payment(&nodes[0], &[&nodes[2], &nodes[3], &nodes[4]], 1000000);
5363         // 5th HTLC:
5364         let (_, payment_hash_4, _) = route_payment(&nodes[0], &[&nodes[2], &nodes[3], &nodes[4]], 1000000);
5365         let route = get_route(our_node_id, &net_graph_msg_handler.network_graph, &nodes[5].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 1000000, TEST_FINAL_CLTV, &logger).unwrap();
5366         // 6th HTLC:
5367         send_along_route_with_secret(&nodes[1], route.clone(), &[&[&nodes[2], &nodes[3], &nodes[5]]], 1000000, payment_hash_3, nodes[5].node.create_inbound_payment_for_hash(payment_hash_3, None, 7200, 0).unwrap());
5368         // 7th HTLC:
5369         send_along_route_with_secret(&nodes[1], route, &[&[&nodes[2], &nodes[3], &nodes[5]]], 1000000, payment_hash_4, nodes[5].node.create_inbound_payment_for_hash(payment_hash_4, None, 7200, 0).unwrap());
5370
5371         // 8th HTLC:
5372         let (_, payment_hash_5, _) = route_payment(&nodes[0], &[&nodes[2], &nodes[3], &nodes[4]], 1000000);
5373         // 9th HTLC:
5374         let route = get_route(our_node_id, &net_graph_msg_handler.network_graph, &nodes[5].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), ds_dust_limit*1000, TEST_FINAL_CLTV, &logger).unwrap();
5375         send_along_route_with_secret(&nodes[1], route, &[&[&nodes[2], &nodes[3], &nodes[5]]], ds_dust_limit*1000, payment_hash_5, nodes[5].node.create_inbound_payment_for_hash(payment_hash_5, None, 7200, 0).unwrap()); // not added < dust limit + HTLC tx fee
5376
5377         // 10th HTLC:
5378         let (_, payment_hash_6, _) = route_payment(&nodes[0], &[&nodes[2], &nodes[3], &nodes[4]], ds_dust_limit*1000); // not added < dust limit + HTLC tx fee
5379         // 11th HTLC:
5380         let route = get_route(our_node_id, &net_graph_msg_handler.network_graph, &nodes[5].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 1000000, TEST_FINAL_CLTV, &logger).unwrap();
5381         send_along_route_with_secret(&nodes[1], route, &[&[&nodes[2], &nodes[3], &nodes[5]]], 1000000, payment_hash_6, nodes[5].node.create_inbound_payment_for_hash(payment_hash_6, None, 7200, 0).unwrap());
5382
5383         // Double-check that six of the new HTLC were added
5384         // We now have six HTLCs pending over the dust limit and six HTLCs under the dust limit (ie,
5385         // with to_local and to_remote outputs, 8 outputs and 6 HTLCs not included).
5386         assert_eq!(get_local_commitment_txn!(nodes[3], chan.2).len(), 1);
5387         assert_eq!(get_local_commitment_txn!(nodes[3], chan.2)[0].output.len(), 8);
5388
5389         // Now fail back three of the over-dust-limit and three of the under-dust-limit payments in one go.
5390         // Fail 0th below-dust, 4th above-dust, 8th above-dust, 10th below-dust HTLCs
5391         assert!(nodes[4].node.fail_htlc_backwards(&payment_hash_1));
5392         assert!(nodes[4].node.fail_htlc_backwards(&payment_hash_3));
5393         assert!(nodes[4].node.fail_htlc_backwards(&payment_hash_5));
5394         assert!(nodes[4].node.fail_htlc_backwards(&payment_hash_6));
5395         check_added_monitors!(nodes[4], 0);
5396         expect_pending_htlcs_forwardable!(nodes[4]);
5397         check_added_monitors!(nodes[4], 1);
5398
5399         let four_removes = get_htlc_update_msgs!(nodes[4], nodes[3].node.get_our_node_id());
5400         nodes[3].node.handle_update_fail_htlc(&nodes[4].node.get_our_node_id(), &four_removes.update_fail_htlcs[0]);
5401         nodes[3].node.handle_update_fail_htlc(&nodes[4].node.get_our_node_id(), &four_removes.update_fail_htlcs[1]);
5402         nodes[3].node.handle_update_fail_htlc(&nodes[4].node.get_our_node_id(), &four_removes.update_fail_htlcs[2]);
5403         nodes[3].node.handle_update_fail_htlc(&nodes[4].node.get_our_node_id(), &four_removes.update_fail_htlcs[3]);
5404         commitment_signed_dance!(nodes[3], nodes[4], four_removes.commitment_signed, false);
5405
5406         // Fail 3rd below-dust and 7th above-dust HTLCs
5407         assert!(nodes[5].node.fail_htlc_backwards(&payment_hash_2));
5408         assert!(nodes[5].node.fail_htlc_backwards(&payment_hash_4));
5409         check_added_monitors!(nodes[5], 0);
5410         expect_pending_htlcs_forwardable!(nodes[5]);
5411         check_added_monitors!(nodes[5], 1);
5412
5413         let two_removes = get_htlc_update_msgs!(nodes[5], nodes[3].node.get_our_node_id());
5414         nodes[3].node.handle_update_fail_htlc(&nodes[5].node.get_our_node_id(), &two_removes.update_fail_htlcs[0]);
5415         nodes[3].node.handle_update_fail_htlc(&nodes[5].node.get_our_node_id(), &two_removes.update_fail_htlcs[1]);
5416         commitment_signed_dance!(nodes[3], nodes[5], two_removes.commitment_signed, false);
5417
5418         let ds_prev_commitment_tx = get_local_commitment_txn!(nodes[3], chan.2);
5419
5420         expect_pending_htlcs_forwardable!(nodes[3]);
5421         check_added_monitors!(nodes[3], 1);
5422         let six_removes = get_htlc_update_msgs!(nodes[3], nodes[2].node.get_our_node_id());
5423         nodes[2].node.handle_update_fail_htlc(&nodes[3].node.get_our_node_id(), &six_removes.update_fail_htlcs[0]);
5424         nodes[2].node.handle_update_fail_htlc(&nodes[3].node.get_our_node_id(), &six_removes.update_fail_htlcs[1]);
5425         nodes[2].node.handle_update_fail_htlc(&nodes[3].node.get_our_node_id(), &six_removes.update_fail_htlcs[2]);
5426         nodes[2].node.handle_update_fail_htlc(&nodes[3].node.get_our_node_id(), &six_removes.update_fail_htlcs[3]);
5427         nodes[2].node.handle_update_fail_htlc(&nodes[3].node.get_our_node_id(), &six_removes.update_fail_htlcs[4]);
5428         nodes[2].node.handle_update_fail_htlc(&nodes[3].node.get_our_node_id(), &six_removes.update_fail_htlcs[5]);
5429         if deliver_last_raa {
5430                 commitment_signed_dance!(nodes[2], nodes[3], six_removes.commitment_signed, false);
5431         } else {
5432                 let _cs_last_raa = commitment_signed_dance!(nodes[2], nodes[3], six_removes.commitment_signed, false, true, false, true);
5433         }
5434
5435         // D's latest commitment transaction now contains 1st + 2nd + 9th HTLCs (implicitly, they're
5436         // below the dust limit) and the 5th + 6th + 11th HTLCs. It has failed back the 0th, 3rd, 4th,
5437         // 7th, 8th, and 10th, but as we haven't yet delivered the final RAA to C, the fails haven't
5438         // propagated back to A/B yet (and D has two unrevoked commitment transactions).
5439         //
5440         // We now broadcast the latest commitment transaction, which *should* result in failures for
5441         // the 0th, 1st, 2nd, 3rd, 4th, 7th, 8th, 9th, and 10th HTLCs, ie all the below-dust HTLCs and
5442         // the non-broadcast above-dust HTLCs.
5443         //
5444         // Alternatively, we may broadcast the previous commitment transaction, which should only
5445         // result in failures for the below-dust HTLCs, ie the 0th, 1st, 2nd, 3rd, 9th, and 10th HTLCs.
5446         let ds_last_commitment_tx = get_local_commitment_txn!(nodes[3], chan.2);
5447
5448         if announce_latest {
5449                 mine_transaction(&nodes[2], &ds_last_commitment_tx[0]);
5450         } else {
5451                 mine_transaction(&nodes[2], &ds_prev_commitment_tx[0]);
5452         }
5453         let events = nodes[2].node.get_and_clear_pending_events();
5454         let close_event = if deliver_last_raa {
5455                 assert_eq!(events.len(), 2);
5456                 events[1].clone()
5457         } else {
5458                 assert_eq!(events.len(), 1);
5459                 events[0].clone()
5460         };
5461         match close_event {
5462                 Event::ChannelClosed { reason: ClosureReason::CommitmentTxConfirmed, .. } => {}
5463                 _ => panic!("Unexpected event"),
5464         }
5465
5466         connect_blocks(&nodes[2], ANTI_REORG_DELAY - 1);
5467         check_closed_broadcast!(nodes[2], true);
5468         if deliver_last_raa {
5469                 expect_pending_htlcs_forwardable_from_events!(nodes[2], events[0..1], true);
5470         } else {
5471                 expect_pending_htlcs_forwardable!(nodes[2]);
5472         }
5473         check_added_monitors!(nodes[2], 3);
5474
5475         let cs_msgs = nodes[2].node.get_and_clear_pending_msg_events();
5476         assert_eq!(cs_msgs.len(), 2);
5477         let mut a_done = false;
5478         for msg in cs_msgs {
5479                 match msg {
5480                         MessageSendEvent::UpdateHTLCs { ref node_id, ref updates } => {
5481                                 // Both under-dust HTLCs and the one above-dust HTLC that we had already failed
5482                                 // should be failed-backwards here.
5483                                 let target = if *node_id == nodes[0].node.get_our_node_id() {
5484                                         // If announce_latest, expect 0th, 1st, 4th, 8th, 10th HTLCs, else only 0th, 1st, 10th below-dust HTLCs
5485                                         for htlc in &updates.update_fail_htlcs {
5486                                                 assert!(htlc.htlc_id == 1 || htlc.htlc_id == 2 || htlc.htlc_id == 6 || if announce_latest { htlc.htlc_id == 3 || htlc.htlc_id == 5 } else { false });
5487                                         }
5488                                         assert_eq!(updates.update_fail_htlcs.len(), if announce_latest { 5 } else { 3 });
5489                                         assert!(!a_done);
5490                                         a_done = true;
5491                                         &nodes[0]
5492                                 } else {
5493                                         // If announce_latest, expect 2nd, 3rd, 7th, 9th HTLCs, else only 2nd, 3rd, 9th below-dust HTLCs
5494                                         for htlc in &updates.update_fail_htlcs {
5495                                                 assert!(htlc.htlc_id == 1 || htlc.htlc_id == 2 || htlc.htlc_id == 5 || if announce_latest { htlc.htlc_id == 4 } else { false });
5496                                         }
5497                                         assert_eq!(*node_id, nodes[1].node.get_our_node_id());
5498                                         assert_eq!(updates.update_fail_htlcs.len(), if announce_latest { 4 } else { 3 });
5499                                         &nodes[1]
5500                                 };
5501                                 target.node.handle_update_fail_htlc(&nodes[2].node.get_our_node_id(), &updates.update_fail_htlcs[0]);
5502                                 target.node.handle_update_fail_htlc(&nodes[2].node.get_our_node_id(), &updates.update_fail_htlcs[1]);
5503                                 target.node.handle_update_fail_htlc(&nodes[2].node.get_our_node_id(), &updates.update_fail_htlcs[2]);
5504                                 if announce_latest {
5505                                         target.node.handle_update_fail_htlc(&nodes[2].node.get_our_node_id(), &updates.update_fail_htlcs[3]);
5506                                         if *node_id == nodes[0].node.get_our_node_id() {
5507                                                 target.node.handle_update_fail_htlc(&nodes[2].node.get_our_node_id(), &updates.update_fail_htlcs[4]);
5508                                         }
5509                                 }
5510                                 commitment_signed_dance!(target, nodes[2], updates.commitment_signed, false, true);
5511                         },
5512                         _ => panic!("Unexpected event"),
5513                 }
5514         }
5515
5516         let as_events = nodes[0].node.get_and_clear_pending_events();
5517         assert_eq!(as_events.len(), if announce_latest { 5 } else { 3 });
5518         let mut as_failds = HashSet::new();
5519         let mut as_updates = 0;
5520         for event in as_events.iter() {
5521                 if let &Event::PaymentPathFailed { ref payment_hash, ref rejected_by_dest, ref network_update, .. } = event {
5522                         assert!(as_failds.insert(*payment_hash));
5523                         if *payment_hash != payment_hash_2 {
5524                                 assert_eq!(*rejected_by_dest, deliver_last_raa);
5525                         } else {
5526                                 assert!(!rejected_by_dest);
5527                         }
5528                         if network_update.is_some() {
5529                                 as_updates += 1;
5530                         }
5531                 } else { panic!("Unexpected event"); }
5532         }
5533         assert!(as_failds.contains(&payment_hash_1));
5534         assert!(as_failds.contains(&payment_hash_2));
5535         if announce_latest {
5536                 assert!(as_failds.contains(&payment_hash_3));
5537                 assert!(as_failds.contains(&payment_hash_5));
5538         }
5539         assert!(as_failds.contains(&payment_hash_6));
5540
5541         let bs_events = nodes[1].node.get_and_clear_pending_events();
5542         assert_eq!(bs_events.len(), if announce_latest { 4 } else { 3 });
5543         let mut bs_failds = HashSet::new();
5544         let mut bs_updates = 0;
5545         for event in bs_events.iter() {
5546                 if let &Event::PaymentPathFailed { ref payment_hash, ref rejected_by_dest, ref network_update, .. } = event {
5547                         assert!(bs_failds.insert(*payment_hash));
5548                         if *payment_hash != payment_hash_1 && *payment_hash != payment_hash_5 {
5549                                 assert_eq!(*rejected_by_dest, deliver_last_raa);
5550                         } else {
5551                                 assert!(!rejected_by_dest);
5552                         }
5553                         if network_update.is_some() {
5554                                 bs_updates += 1;
5555                         }
5556                 } else { panic!("Unexpected event"); }
5557         }
5558         assert!(bs_failds.contains(&payment_hash_1));
5559         assert!(bs_failds.contains(&payment_hash_2));
5560         if announce_latest {
5561                 assert!(bs_failds.contains(&payment_hash_4));
5562         }
5563         assert!(bs_failds.contains(&payment_hash_5));
5564
5565         // For each HTLC which was not failed-back by normal process (ie deliver_last_raa), we should
5566         // get a NetworkUpdate. A should have gotten 4 HTLCs which were failed-back due to
5567         // unknown-preimage-etc, B should have gotten 2. Thus, in the
5568         // announce_latest && deliver_last_raa case, we should have 5-4=1 and 4-2=2 NetworkUpdates.
5569         assert_eq!(as_updates, if deliver_last_raa { 1 } else if !announce_latest { 3 } else { 5 });
5570         assert_eq!(bs_updates, if deliver_last_raa { 2 } else if !announce_latest { 3 } else { 4 });
5571 }
5572
5573 #[test]
5574 fn test_fail_backwards_latest_remote_announce_a() {
5575         do_test_fail_backwards_unrevoked_remote_announce(false, true);
5576 }
5577
5578 #[test]
5579 fn test_fail_backwards_latest_remote_announce_b() {
5580         do_test_fail_backwards_unrevoked_remote_announce(true, true);
5581 }
5582
5583 #[test]
5584 fn test_fail_backwards_previous_remote_announce() {
5585         do_test_fail_backwards_unrevoked_remote_announce(false, false);
5586         // Note that true, true doesn't make sense as it implies we announce a revoked state, which is
5587         // tested for in test_commitment_revoked_fail_backward_exhaustive()
5588 }
5589
5590 #[test]
5591 fn test_dynamic_spendable_outputs_local_htlc_timeout_tx() {
5592         let chanmon_cfgs = create_chanmon_cfgs(2);
5593         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
5594         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
5595         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
5596
5597         // Create some initial channels
5598         let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
5599
5600         let (_, our_payment_hash, _) = route_payment(&nodes[0], &vec!(&nodes[1])[..], 9000000);
5601         let local_txn = get_local_commitment_txn!(nodes[0], chan_1.2);
5602         assert_eq!(local_txn[0].input.len(), 1);
5603         check_spends!(local_txn[0], chan_1.3);
5604
5605         // Timeout HTLC on A's chain and so it can generate a HTLC-Timeout tx
5606         mine_transaction(&nodes[0], &local_txn[0]);
5607         check_closed_broadcast!(nodes[0], true);
5608         check_added_monitors!(nodes[0], 1);
5609         check_closed_event!(nodes[0], 1, ClosureReason::CommitmentTxConfirmed);
5610         connect_blocks(&nodes[0], TEST_FINAL_CLTV - 1); // Confirm blocks until the HTLC expires
5611
5612         let htlc_timeout = {
5613                 let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
5614                 assert_eq!(node_txn.len(), 2);
5615                 check_spends!(node_txn[0], chan_1.3);
5616                 assert_eq!(node_txn[1].input.len(), 1);
5617                 assert_eq!(node_txn[1].input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
5618                 check_spends!(node_txn[1], local_txn[0]);
5619                 node_txn[1].clone()
5620         };
5621
5622         mine_transaction(&nodes[0], &htlc_timeout);
5623         connect_blocks(&nodes[0], BREAKDOWN_TIMEOUT as u32 - 1);
5624         expect_payment_failed!(nodes[0], our_payment_hash, true);
5625
5626         // Verify that A is able to spend its own HTLC-Timeout tx thanks to spendable output event given back by its ChannelMonitor
5627         let spend_txn = check_spendable_outputs!(nodes[0], node_cfgs[0].keys_manager);
5628         assert_eq!(spend_txn.len(), 3);
5629         check_spends!(spend_txn[0], local_txn[0]);
5630         assert_eq!(spend_txn[1].input.len(), 1);
5631         check_spends!(spend_txn[1], htlc_timeout);
5632         assert_eq!(spend_txn[1].input[0].sequence, BREAKDOWN_TIMEOUT as u32);
5633         assert_eq!(spend_txn[2].input.len(), 2);
5634         check_spends!(spend_txn[2], local_txn[0], htlc_timeout);
5635         assert!(spend_txn[2].input[0].sequence == BREAKDOWN_TIMEOUT as u32 ||
5636                 spend_txn[2].input[1].sequence == BREAKDOWN_TIMEOUT as u32);
5637 }
5638
5639 #[test]
5640 fn test_key_derivation_params() {
5641         // This test is a copy of test_dynamic_spendable_outputs_local_htlc_timeout_tx, with
5642         // a key manager rotation to test that key_derivation_params returned in DynamicOutputP2WSH
5643         // let us re-derive the channel key set to then derive a delayed_payment_key.
5644
5645         let chanmon_cfgs = create_chanmon_cfgs(3);
5646
5647         // We manually create the node configuration to backup the seed.
5648         let seed = [42; 32];
5649         let keys_manager = test_utils::TestKeysInterface::new(&seed, Network::Testnet);
5650         let chain_monitor = test_utils::TestChainMonitor::new(Some(&chanmon_cfgs[0].chain_source), &chanmon_cfgs[0].tx_broadcaster, &chanmon_cfgs[0].logger, &chanmon_cfgs[0].fee_estimator, &chanmon_cfgs[0].persister, &keys_manager);
5651         let node = NodeCfg { chain_source: &chanmon_cfgs[0].chain_source, logger: &chanmon_cfgs[0].logger, tx_broadcaster: &chanmon_cfgs[0].tx_broadcaster, fee_estimator: &chanmon_cfgs[0].fee_estimator, chain_monitor, keys_manager: &keys_manager, node_seed: seed, features: InitFeatures::known() };
5652         let mut node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
5653         node_cfgs.remove(0);
5654         node_cfgs.insert(0, node);
5655
5656         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
5657         let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
5658
5659         // Create some initial channels
5660         // Create a dummy channel to advance index by one and thus test re-derivation correctness
5661         // for node 0
5662         let chan_0 = create_announced_chan_between_nodes(&nodes, 0, 2, InitFeatures::known(), InitFeatures::known());
5663         let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
5664         assert_ne!(chan_0.3.output[0].script_pubkey, chan_1.3.output[0].script_pubkey);
5665
5666         // Ensure all nodes are at the same height
5667         let node_max_height = nodes.iter().map(|node| node.blocks.lock().unwrap().len()).max().unwrap() as u32;
5668         connect_blocks(&nodes[0], node_max_height - nodes[0].best_block_info().1);
5669         connect_blocks(&nodes[1], node_max_height - nodes[1].best_block_info().1);
5670         connect_blocks(&nodes[2], node_max_height - nodes[2].best_block_info().1);
5671
5672         let (_, our_payment_hash, _) = route_payment(&nodes[0], &vec!(&nodes[1])[..], 9000000);
5673         let local_txn_0 = get_local_commitment_txn!(nodes[0], chan_0.2);
5674         let local_txn_1 = get_local_commitment_txn!(nodes[0], chan_1.2);
5675         assert_eq!(local_txn_1[0].input.len(), 1);
5676         check_spends!(local_txn_1[0], chan_1.3);
5677
5678         // We check funding pubkey are unique
5679         let (from_0_funding_key_0, from_0_funding_key_1) = (PublicKey::from_slice(&local_txn_0[0].input[0].witness[3][2..35]), PublicKey::from_slice(&local_txn_0[0].input[0].witness[3][36..69]));
5680         let (from_1_funding_key_0, from_1_funding_key_1) = (PublicKey::from_slice(&local_txn_1[0].input[0].witness[3][2..35]), PublicKey::from_slice(&local_txn_1[0].input[0].witness[3][36..69]));
5681         if from_0_funding_key_0 == from_1_funding_key_0
5682             || from_0_funding_key_0 == from_1_funding_key_1
5683             || from_0_funding_key_1 == from_1_funding_key_0
5684             || from_0_funding_key_1 == from_1_funding_key_1 {
5685                 panic!("Funding pubkeys aren't unique");
5686         }
5687
5688         // Timeout HTLC on A's chain and so it can generate a HTLC-Timeout tx
5689         mine_transaction(&nodes[0], &local_txn_1[0]);
5690         connect_blocks(&nodes[0], TEST_FINAL_CLTV - 1); // Confirm blocks until the HTLC expires
5691         check_closed_broadcast!(nodes[0], true);
5692         check_added_monitors!(nodes[0], 1);
5693         check_closed_event!(nodes[0], 1, ClosureReason::CommitmentTxConfirmed);
5694
5695         let htlc_timeout = {
5696                 let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
5697                 assert_eq!(node_txn[1].input.len(), 1);
5698                 assert_eq!(node_txn[1].input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
5699                 check_spends!(node_txn[1], local_txn_1[0]);
5700                 node_txn[1].clone()
5701         };
5702
5703         mine_transaction(&nodes[0], &htlc_timeout);
5704         connect_blocks(&nodes[0], BREAKDOWN_TIMEOUT as u32 - 1);
5705         expect_payment_failed!(nodes[0], our_payment_hash, true);
5706
5707         // Verify that A is able to spend its own HTLC-Timeout tx thanks to spendable output event given back by its ChannelMonitor
5708         let new_keys_manager = test_utils::TestKeysInterface::new(&seed, Network::Testnet);
5709         let spend_txn = check_spendable_outputs!(nodes[0], new_keys_manager);
5710         assert_eq!(spend_txn.len(), 3);
5711         check_spends!(spend_txn[0], local_txn_1[0]);
5712         assert_eq!(spend_txn[1].input.len(), 1);
5713         check_spends!(spend_txn[1], htlc_timeout);
5714         assert_eq!(spend_txn[1].input[0].sequence, BREAKDOWN_TIMEOUT as u32);
5715         assert_eq!(spend_txn[2].input.len(), 2);
5716         check_spends!(spend_txn[2], local_txn_1[0], htlc_timeout);
5717         assert!(spend_txn[2].input[0].sequence == BREAKDOWN_TIMEOUT as u32 ||
5718                 spend_txn[2].input[1].sequence == BREAKDOWN_TIMEOUT as u32);
5719 }
5720
5721 #[test]
5722 fn test_static_output_closing_tx() {
5723         let chanmon_cfgs = create_chanmon_cfgs(2);
5724         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
5725         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
5726         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
5727
5728         let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
5729
5730         send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
5731         let closing_tx = close_channel(&nodes[0], &nodes[1], &chan.2, chan.3, true).2;
5732
5733         mine_transaction(&nodes[0], &closing_tx);
5734         check_closed_event!(nodes[0], 1, ClosureReason::CooperativeClosure);
5735         connect_blocks(&nodes[0], ANTI_REORG_DELAY - 1);
5736
5737         let spend_txn = check_spendable_outputs!(nodes[0], node_cfgs[0].keys_manager);
5738         assert_eq!(spend_txn.len(), 1);
5739         check_spends!(spend_txn[0], closing_tx);
5740
5741         mine_transaction(&nodes[1], &closing_tx);
5742         check_closed_event!(nodes[1], 1, ClosureReason::CooperativeClosure);
5743         connect_blocks(&nodes[1], ANTI_REORG_DELAY - 1);
5744
5745         let spend_txn = check_spendable_outputs!(nodes[1], node_cfgs[1].keys_manager);
5746         assert_eq!(spend_txn.len(), 1);
5747         check_spends!(spend_txn[0], closing_tx);
5748 }
5749
5750 fn do_htlc_claim_local_commitment_only(use_dust: bool) {
5751         let chanmon_cfgs = create_chanmon_cfgs(2);
5752         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
5753         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
5754         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
5755         let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
5756
5757         let (our_payment_preimage, _, _) = route_payment(&nodes[0], &[&nodes[1]], if use_dust { 50000 } else { 3000000 });
5758
5759         // Claim the payment, but don't deliver A's commitment_signed, resulting in the HTLC only being
5760         // present in B's local commitment transaction, but none of A's commitment transactions.
5761         assert!(nodes[1].node.claim_funds(our_payment_preimage));
5762         check_added_monitors!(nodes[1], 1);
5763
5764         let bs_updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
5765         nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &bs_updates.update_fulfill_htlcs[0]);
5766         let events = nodes[0].node.get_and_clear_pending_events();
5767         assert_eq!(events.len(), 1);
5768         match events[0] {
5769                 Event::PaymentSent { payment_preimage } => {
5770                         assert_eq!(payment_preimage, our_payment_preimage);
5771                 },
5772                 _ => panic!("Unexpected event"),
5773         }
5774
5775         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &bs_updates.commitment_signed);
5776         check_added_monitors!(nodes[0], 1);
5777         let as_updates = get_revoke_commit_msgs!(nodes[0], nodes[1].node.get_our_node_id());
5778         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_updates.0);
5779         check_added_monitors!(nodes[1], 1);
5780
5781         let starting_block = nodes[1].best_block_info();
5782         let mut block = Block {
5783                 header: BlockHeader { version: 0x20000000, prev_blockhash: starting_block.0, merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 },
5784                 txdata: vec![],
5785         };
5786         for _ in starting_block.1 + 1..TEST_FINAL_CLTV - CLTV_CLAIM_BUFFER + starting_block.1 + 2 {
5787                 connect_block(&nodes[1], &block);
5788                 block.header.prev_blockhash = block.block_hash();
5789         }
5790         test_txn_broadcast(&nodes[1], &chan, None, if use_dust { HTLCType::NONE } else { HTLCType::SUCCESS });
5791         check_closed_broadcast!(nodes[1], true);
5792         check_added_monitors!(nodes[1], 1);
5793         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
5794 }
5795
5796 fn do_htlc_claim_current_remote_commitment_only(use_dust: bool) {
5797         let chanmon_cfgs = create_chanmon_cfgs(2);
5798         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
5799         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
5800         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
5801         let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
5802         let logger = test_utils::TestLogger::new();
5803
5804         let (_, payment_hash, payment_secret) = get_payment_preimage_hash!(nodes[1]);
5805         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
5806         let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), if use_dust { 50000 } else { 3000000 }, TEST_FINAL_CLTV, &logger).unwrap();
5807         nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap();
5808         check_added_monitors!(nodes[0], 1);
5809
5810         let _as_update = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
5811
5812         // As far as A is concerned, the HTLC is now present only in the latest remote commitment
5813         // transaction, however it is not in A's latest local commitment, so we can just broadcast that
5814         // to "time out" the HTLC.
5815
5816         let starting_block = nodes[1].best_block_info();
5817         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: starting_block.0, merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
5818
5819         for _ in starting_block.1 + 1..TEST_FINAL_CLTV + LATENCY_GRACE_PERIOD_BLOCKS + starting_block.1 + 2 {
5820                 connect_block(&nodes[0], &Block { header, txdata: Vec::new()});
5821                 header.prev_blockhash = header.block_hash();
5822         }
5823         test_txn_broadcast(&nodes[0], &chan, None, HTLCType::NONE);
5824         check_closed_broadcast!(nodes[0], true);
5825         check_added_monitors!(nodes[0], 1);
5826         check_closed_event!(nodes[0], 1, ClosureReason::CommitmentTxConfirmed);
5827 }
5828
5829 fn do_htlc_claim_previous_remote_commitment_only(use_dust: bool, check_revoke_no_close: bool) {
5830         let chanmon_cfgs = create_chanmon_cfgs(3);
5831         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
5832         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
5833         let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
5834         let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
5835
5836         // Fail the payment, but don't deliver A's final RAA, resulting in the HTLC only being present
5837         // in B's previous (unrevoked) commitment transaction, but none of A's commitment transactions.
5838         // Also optionally test that we *don't* fail the channel in case the commitment transaction was
5839         // actually revoked.
5840         let htlc_value = if use_dust { 50000 } else { 3000000 };
5841         let (_, our_payment_hash, _) = route_payment(&nodes[0], &[&nodes[1]], htlc_value);
5842         assert!(nodes[1].node.fail_htlc_backwards(&our_payment_hash));
5843         expect_pending_htlcs_forwardable!(nodes[1]);
5844         check_added_monitors!(nodes[1], 1);
5845
5846         let bs_updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
5847         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &bs_updates.update_fail_htlcs[0]);
5848         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &bs_updates.commitment_signed);
5849         check_added_monitors!(nodes[0], 1);
5850         let as_updates = get_revoke_commit_msgs!(nodes[0], nodes[1].node.get_our_node_id());
5851         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_updates.0);
5852         check_added_monitors!(nodes[1], 1);
5853         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &as_updates.1);
5854         check_added_monitors!(nodes[1], 1);
5855         let bs_revoke_and_ack = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
5856
5857         if check_revoke_no_close {
5858                 nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_revoke_and_ack);
5859                 check_added_monitors!(nodes[0], 1);
5860         }
5861
5862         let starting_block = nodes[1].best_block_info();
5863         let mut block = Block {
5864                 header: BlockHeader { version: 0x20000000, prev_blockhash: starting_block.0, merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 },
5865                 txdata: vec![],
5866         };
5867         for _ in starting_block.1 + 1..TEST_FINAL_CLTV + LATENCY_GRACE_PERIOD_BLOCKS + CHAN_CONFIRM_DEPTH + 2 {
5868                 connect_block(&nodes[0], &block);
5869                 block.header.prev_blockhash = block.block_hash();
5870         }
5871         if !check_revoke_no_close {
5872                 test_txn_broadcast(&nodes[0], &chan, None, HTLCType::NONE);
5873                 check_closed_broadcast!(nodes[0], true);
5874                 check_added_monitors!(nodes[0], 1);
5875                 check_closed_event!(nodes[0], 1, ClosureReason::CommitmentTxConfirmed);
5876         } else {
5877                 expect_payment_failed!(nodes[0], our_payment_hash, true);
5878         }
5879 }
5880
5881 // Test that we close channels on-chain when broadcastable HTLCs reach their timeout window.
5882 // There are only a few cases to test here:
5883 //  * its not really normative behavior, but we test that below-dust HTLCs "included" in
5884 //    broadcastable commitment transactions result in channel closure,
5885 //  * its included in an unrevoked-but-previous remote commitment transaction,
5886 //  * its included in the latest remote or local commitment transactions.
5887 // We test each of the three possible commitment transactions individually and use both dust and
5888 // non-dust HTLCs.
5889 // Note that we don't bother testing both outbound and inbound HTLC failures for each case, and we
5890 // assume they are handled the same across all six cases, as both outbound and inbound failures are
5891 // tested for at least one of the cases in other tests.
5892 #[test]
5893 fn htlc_claim_single_commitment_only_a() {
5894         do_htlc_claim_local_commitment_only(true);
5895         do_htlc_claim_local_commitment_only(false);
5896
5897         do_htlc_claim_current_remote_commitment_only(true);
5898         do_htlc_claim_current_remote_commitment_only(false);
5899 }
5900
5901 #[test]
5902 fn htlc_claim_single_commitment_only_b() {
5903         do_htlc_claim_previous_remote_commitment_only(true, false);
5904         do_htlc_claim_previous_remote_commitment_only(false, false);
5905         do_htlc_claim_previous_remote_commitment_only(true, true);
5906         do_htlc_claim_previous_remote_commitment_only(false, true);
5907 }
5908
5909 #[test]
5910 #[should_panic]
5911 fn bolt2_open_channel_sending_node_checks_part1() { //This test needs to be on its own as we are catching a panic
5912         let chanmon_cfgs = create_chanmon_cfgs(2);
5913         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
5914         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
5915         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
5916         //Force duplicate channel ids
5917         for node in nodes.iter() {
5918                 *node.keys_manager.override_channel_id_priv.lock().unwrap() = Some([0; 32]);
5919         }
5920
5921         // BOLT #2 spec: Sending node must ensure temporary_channel_id is unique from any other channel ID with the same peer.
5922         let channel_value_satoshis=10000;
5923         let push_msat=10001;
5924         nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), channel_value_satoshis, push_msat, 42, None).unwrap();
5925         let node0_to_1_send_open_channel = get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id());
5926         nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), InitFeatures::known(), &node0_to_1_send_open_channel);
5927
5928         //Create a second channel with a channel_id collision
5929         assert!(nodes[0].node.create_channel(nodes[0].node.get_our_node_id(), channel_value_satoshis, push_msat, 42, None).is_err());
5930 }
5931
5932 #[test]
5933 fn bolt2_open_channel_sending_node_checks_part2() {
5934         let chanmon_cfgs = create_chanmon_cfgs(2);
5935         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
5936         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
5937         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
5938
5939         // BOLT #2 spec: Sending node must set funding_satoshis to less than 2^24 satoshis
5940         let channel_value_satoshis=2^24;
5941         let push_msat=10001;
5942         assert!(nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), channel_value_satoshis, push_msat, 42, None).is_err());
5943
5944         // BOLT #2 spec: Sending node must set push_msat to equal or less than 1000 * funding_satoshis
5945         let channel_value_satoshis=10000;
5946         // Test when push_msat is equal to 1000 * funding_satoshis.
5947         let push_msat=1000*channel_value_satoshis+1;
5948         assert!(nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), channel_value_satoshis, push_msat, 42, None).is_err());
5949
5950         // BOLT #2 spec: Sending node must set set channel_reserve_satoshis greater than or equal to dust_limit_satoshis
5951         let channel_value_satoshis=10000;
5952         let push_msat=10001;
5953         assert!(nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), channel_value_satoshis, push_msat, 42, None).is_ok()); //Create a valid channel
5954         let node0_to_1_send_open_channel = get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id());
5955         assert!(node0_to_1_send_open_channel.channel_reserve_satoshis>=node0_to_1_send_open_channel.dust_limit_satoshis);
5956
5957         // BOLT #2 spec: Sending node must set undefined bits in channel_flags to 0
5958         // Only the least-significant bit of channel_flags is currently defined resulting in channel_flags only having one of two possible states 0 or 1
5959         assert!(node0_to_1_send_open_channel.channel_flags<=1);
5960
5961         // BOLT #2 spec: Sending node should set to_self_delay sufficient to ensure the sender can irreversibly spend a commitment transaction output, in case of misbehaviour by the receiver.
5962         assert!(BREAKDOWN_TIMEOUT>0);
5963         assert!(node0_to_1_send_open_channel.to_self_delay==BREAKDOWN_TIMEOUT);
5964
5965         // BOLT #2 spec: Sending node must ensure the chain_hash value identifies the chain it wishes to open the channel within.
5966         let chain_hash=genesis_block(Network::Testnet).header.block_hash();
5967         assert_eq!(node0_to_1_send_open_channel.chain_hash,chain_hash);
5968
5969         // BOLT #2 spec: Sending node must set funding_pubkey, revocation_basepoint, htlc_basepoint, payment_basepoint, and delayed_payment_basepoint to valid DER-encoded, compressed, secp256k1 pubkeys.
5970         assert!(PublicKey::from_slice(&node0_to_1_send_open_channel.funding_pubkey.serialize()).is_ok());
5971         assert!(PublicKey::from_slice(&node0_to_1_send_open_channel.revocation_basepoint.serialize()).is_ok());
5972         assert!(PublicKey::from_slice(&node0_to_1_send_open_channel.htlc_basepoint.serialize()).is_ok());
5973         assert!(PublicKey::from_slice(&node0_to_1_send_open_channel.payment_point.serialize()).is_ok());
5974         assert!(PublicKey::from_slice(&node0_to_1_send_open_channel.delayed_payment_basepoint.serialize()).is_ok());
5975 }
5976
5977 #[test]
5978 fn bolt2_open_channel_sane_dust_limit() {
5979         let chanmon_cfgs = create_chanmon_cfgs(2);
5980         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
5981         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
5982         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
5983
5984         let channel_value_satoshis=1000000;
5985         let push_msat=10001;
5986         nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), channel_value_satoshis, push_msat, 42, None).unwrap();
5987         let mut node0_to_1_send_open_channel = get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id());
5988         node0_to_1_send_open_channel.dust_limit_satoshis = 661;
5989         node0_to_1_send_open_channel.channel_reserve_satoshis = 100001;
5990
5991         nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), InitFeatures::known(), &node0_to_1_send_open_channel);
5992         let events = nodes[1].node.get_and_clear_pending_msg_events();
5993         let err_msg = match events[0] {
5994                 MessageSendEvent::HandleError { action: ErrorAction::SendErrorMessage { ref msg }, node_id: _ } => {
5995                         msg.clone()
5996                 },
5997                 _ => panic!("Unexpected event"),
5998         };
5999         assert_eq!(err_msg.data, "dust_limit_satoshis (661) is greater than the implementation limit (660)");
6000 }
6001
6002 // Test that if we fail to send an HTLC that is being freed from the holding cell, and the HTLC
6003 // originated from our node, its failure is surfaced to the user. We trigger this failure to
6004 // free the HTLC by increasing our fee while the HTLC is in the holding cell such that the HTLC
6005 // is no longer affordable once it's freed.
6006 #[test]
6007 fn test_fail_holding_cell_htlc_upon_free() {
6008         let chanmon_cfgs = create_chanmon_cfgs(2);
6009         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
6010         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
6011         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
6012         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 95000000, InitFeatures::known(), InitFeatures::known());
6013         let logger = test_utils::TestLogger::new();
6014
6015         // First nodes[0] generates an update_fee, setting the channel's
6016         // pending_update_fee.
6017         {
6018                 let mut feerate_lock = chanmon_cfgs[0].fee_estimator.sat_per_kw.lock().unwrap();
6019                 *feerate_lock += 20;
6020         }
6021         nodes[0].node.timer_tick_occurred();
6022         check_added_monitors!(nodes[0], 1);
6023
6024         let events = nodes[0].node.get_and_clear_pending_msg_events();
6025         assert_eq!(events.len(), 1);
6026         let (update_msg, commitment_signed) = match events[0] {
6027                 MessageSendEvent::UpdateHTLCs { updates: msgs::CommitmentUpdate { ref update_fee, ref commitment_signed, .. }, .. } => {
6028                         (update_fee.as_ref(), commitment_signed)
6029                 },
6030                 _ => panic!("Unexpected event"),
6031         };
6032
6033         nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg.unwrap());
6034
6035         let mut chan_stat = get_channel_value_stat!(nodes[0], chan.2);
6036         let channel_reserve = chan_stat.channel_reserve_msat;
6037         let feerate = get_feerate!(nodes[0], chan.2);
6038
6039         // 2* and +1 HTLCs on the commit tx fee calculation for the fee spike reserve.
6040         let (_, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[1]);
6041         let max_can_send = 5000000 - channel_reserve - 2*commit_tx_fee_msat(feerate, 1 + 1);
6042         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
6043         let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], max_can_send, TEST_FINAL_CLTV, &logger).unwrap();
6044
6045         // Send a payment which passes reserve checks but gets stuck in the holding cell.
6046         nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
6047         chan_stat = get_channel_value_stat!(nodes[0], chan.2);
6048         assert_eq!(chan_stat.holding_cell_outbound_amount_msat, max_can_send);
6049
6050         // Flush the pending fee update.
6051         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), commitment_signed);
6052         let (as_revoke_and_ack, _) = get_revoke_commit_msgs!(nodes[1], nodes[0].node.get_our_node_id());
6053         check_added_monitors!(nodes[1], 1);
6054         nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &as_revoke_and_ack);
6055         check_added_monitors!(nodes[0], 1);
6056
6057         // Upon receipt of the RAA, there will be an attempt to resend the holding cell
6058         // HTLC, but now that the fee has been raised the payment will now fail, causing
6059         // us to surface its failure to the user.
6060         chan_stat = get_channel_value_stat!(nodes[0], chan.2);
6061         assert_eq!(chan_stat.holding_cell_outbound_amount_msat, 0);
6062         nodes[0].logger.assert_log("lightning::ln::channel".to_string(), format!("Freeing holding cell with 1 HTLC updates in channel {}", hex::encode(chan.2)), 1);
6063         let failure_log = format!("Failed to send HTLC with payment_hash {} due to Cannot send value that would put our balance under counterparty-announced channel reserve value ({}) in channel {}",
6064                 hex::encode(our_payment_hash.0), chan_stat.channel_reserve_msat, hex::encode(chan.2));
6065         nodes[0].logger.assert_log("lightning::ln::channel".to_string(), failure_log.to_string(), 1);
6066
6067         // Check that the payment failed to be sent out.
6068         let events = nodes[0].node.get_and_clear_pending_events();
6069         assert_eq!(events.len(), 1);
6070         match &events[0] {
6071                 &Event::PaymentPathFailed { ref payment_hash, ref rejected_by_dest, ref network_update, ref error_code, ref error_data, ref all_paths_failed } => {
6072                         assert_eq!(our_payment_hash.clone(), *payment_hash);
6073                         assert_eq!(*rejected_by_dest, false);
6074                         assert_eq!(*all_paths_failed, true);
6075                         assert_eq!(*network_update, None);
6076                         assert_eq!(*error_code, None);
6077                         assert_eq!(*error_data, None);
6078                 },
6079                 _ => panic!("Unexpected event"),
6080         }
6081 }
6082
6083 // Test that if multiple HTLCs are released from the holding cell and one is
6084 // valid but the other is no longer valid upon release, the valid HTLC can be
6085 // successfully completed while the other one fails as expected.
6086 #[test]
6087 fn test_free_and_fail_holding_cell_htlcs() {
6088         let chanmon_cfgs = create_chanmon_cfgs(2);
6089         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
6090         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
6091         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
6092         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 95000000, InitFeatures::known(), InitFeatures::known());
6093         let logger = test_utils::TestLogger::new();
6094
6095         // First nodes[0] generates an update_fee, setting the channel's
6096         // pending_update_fee.
6097         {
6098                 let mut feerate_lock = chanmon_cfgs[0].fee_estimator.sat_per_kw.lock().unwrap();
6099                 *feerate_lock += 200;
6100         }
6101         nodes[0].node.timer_tick_occurred();
6102         check_added_monitors!(nodes[0], 1);
6103
6104         let events = nodes[0].node.get_and_clear_pending_msg_events();
6105         assert_eq!(events.len(), 1);
6106         let (update_msg, commitment_signed) = match events[0] {
6107                 MessageSendEvent::UpdateHTLCs { updates: msgs::CommitmentUpdate { ref update_fee, ref commitment_signed, .. }, .. } => {
6108                         (update_fee.as_ref(), commitment_signed)
6109                 },
6110                 _ => panic!("Unexpected event"),
6111         };
6112
6113         nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg.unwrap());
6114
6115         let mut chan_stat = get_channel_value_stat!(nodes[0], chan.2);
6116         let channel_reserve = chan_stat.channel_reserve_msat;
6117         let feerate = get_feerate!(nodes[0], chan.2);
6118
6119         // 2* and +1 HTLCs on the commit tx fee calculation for the fee spike reserve.
6120         let (payment_preimage_1, payment_hash_1, payment_secret_1) = get_payment_preimage_hash!(nodes[1]);
6121         let amt_1 = 20000;
6122         let (_, payment_hash_2, payment_secret_2) = get_payment_preimage_hash!(nodes[1]);
6123         let amt_2 = 5000000 - channel_reserve - 2*commit_tx_fee_msat(feerate, 2 + 1) - amt_1;
6124         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
6125         let route_1 = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], amt_1, TEST_FINAL_CLTV, &logger).unwrap();
6126         let route_2 = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], amt_2, TEST_FINAL_CLTV, &logger).unwrap();
6127
6128         // Send 2 payments which pass reserve checks but get stuck in the holding cell.
6129         nodes[0].node.send_payment(&route_1, payment_hash_1, &Some(payment_secret_1)).unwrap();
6130         chan_stat = get_channel_value_stat!(nodes[0], chan.2);
6131         assert_eq!(chan_stat.holding_cell_outbound_amount_msat, amt_1);
6132         nodes[0].node.send_payment(&route_2, payment_hash_2, &Some(payment_secret_2)).unwrap();
6133         chan_stat = get_channel_value_stat!(nodes[0], chan.2);
6134         assert_eq!(chan_stat.holding_cell_outbound_amount_msat, amt_1 + amt_2);
6135
6136         // Flush the pending fee update.
6137         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), commitment_signed);
6138         let (revoke_and_ack, commitment_signed) = get_revoke_commit_msgs!(nodes[1], nodes[0].node.get_our_node_id());
6139         check_added_monitors!(nodes[1], 1);
6140         nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &revoke_and_ack);
6141         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &commitment_signed);
6142         check_added_monitors!(nodes[0], 2);
6143
6144         // Upon receipt of the RAA, there will be an attempt to resend the holding cell HTLCs,
6145         // but now that the fee has been raised the second payment will now fail, causing us
6146         // to surface its failure to the user. The first payment should succeed.
6147         chan_stat = get_channel_value_stat!(nodes[0], chan.2);
6148         assert_eq!(chan_stat.holding_cell_outbound_amount_msat, 0);
6149         nodes[0].logger.assert_log("lightning::ln::channel".to_string(), format!("Freeing holding cell with 2 HTLC updates in channel {}", hex::encode(chan.2)), 1);
6150         let failure_log = format!("Failed to send HTLC with payment_hash {} due to Cannot send value that would put our balance under counterparty-announced channel reserve value ({}) in channel {}",
6151                 hex::encode(payment_hash_2.0), chan_stat.channel_reserve_msat, hex::encode(chan.2));
6152         nodes[0].logger.assert_log("lightning::ln::channel".to_string(), failure_log.to_string(), 1);
6153
6154         // Check that the second payment failed to be sent out.
6155         let events = nodes[0].node.get_and_clear_pending_events();
6156         assert_eq!(events.len(), 1);
6157         match &events[0] {
6158                 &Event::PaymentPathFailed { ref payment_hash, ref rejected_by_dest, ref network_update, ref error_code, ref error_data, ref all_paths_failed } => {
6159                         assert_eq!(payment_hash_2.clone(), *payment_hash);
6160                         assert_eq!(*rejected_by_dest, false);
6161                         assert_eq!(*all_paths_failed, true);
6162                         assert_eq!(*network_update, None);
6163                         assert_eq!(*error_code, None);
6164                         assert_eq!(*error_data, None);
6165                 },
6166                 _ => panic!("Unexpected event"),
6167         }
6168
6169         // Complete the first payment and the RAA from the fee update.
6170         let (payment_event, send_raa_event) = {
6171                 let mut msgs = nodes[0].node.get_and_clear_pending_msg_events();
6172                 assert_eq!(msgs.len(), 2);
6173                 (SendEvent::from_event(msgs.remove(0)), msgs.remove(0))
6174         };
6175         let raa = match send_raa_event {
6176                 MessageSendEvent::SendRevokeAndACK { msg, .. } => msg,
6177                 _ => panic!("Unexpected event"),
6178         };
6179         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &raa);
6180         check_added_monitors!(nodes[1], 1);
6181         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
6182         commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
6183         let events = nodes[1].node.get_and_clear_pending_events();
6184         assert_eq!(events.len(), 1);
6185         match events[0] {
6186                 Event::PendingHTLCsForwardable { .. } => {},
6187                 _ => panic!("Unexpected event"),
6188         }
6189         nodes[1].node.process_pending_htlc_forwards();
6190         let events = nodes[1].node.get_and_clear_pending_events();
6191         assert_eq!(events.len(), 1);
6192         match events[0] {
6193                 Event::PaymentReceived { .. } => {},
6194                 _ => panic!("Unexpected event"),
6195         }
6196         nodes[1].node.claim_funds(payment_preimage_1);
6197         check_added_monitors!(nodes[1], 1);
6198         let update_msgs = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
6199         nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &update_msgs.update_fulfill_htlcs[0]);
6200         commitment_signed_dance!(nodes[0], nodes[1], update_msgs.commitment_signed, false, true);
6201         let events = nodes[0].node.get_and_clear_pending_events();
6202         assert_eq!(events.len(), 1);
6203         match events[0] {
6204                 Event::PaymentSent { ref payment_preimage } => {
6205                         assert_eq!(*payment_preimage, payment_preimage_1);
6206                 }
6207                 _ => panic!("Unexpected event"),
6208         }
6209 }
6210
6211 // Test that if we fail to forward an HTLC that is being freed from the holding cell that the
6212 // HTLC is failed backwards. We trigger this failure to forward the freed HTLC by increasing
6213 // our fee while the HTLC is in the holding cell such that the HTLC is no longer affordable
6214 // once it's freed.
6215 #[test]
6216 fn test_fail_holding_cell_htlc_upon_free_multihop() {
6217         let chanmon_cfgs = create_chanmon_cfgs(3);
6218         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
6219         // When this test was written, the default base fee floated based on the HTLC count.
6220         // It is now fixed, so we simply set the fee to the expected value here.
6221         let mut config = test_default_channel_config();
6222         config.channel_options.forwarding_fee_base_msat = 196;
6223         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[Some(config.clone()), Some(config.clone()), Some(config.clone())]);
6224         let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs);
6225         let chan_0_1 = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 95000000, InitFeatures::known(), InitFeatures::known());
6226         let chan_1_2 = create_announced_chan_between_nodes_with_value(&nodes, 1, 2, 100000, 95000000, InitFeatures::known(), InitFeatures::known());
6227         let logger = test_utils::TestLogger::new();
6228
6229         // First nodes[1] generates an update_fee, setting the channel's
6230         // pending_update_fee.
6231         {
6232                 let mut feerate_lock = chanmon_cfgs[1].fee_estimator.sat_per_kw.lock().unwrap();
6233                 *feerate_lock += 20;
6234         }
6235         nodes[1].node.timer_tick_occurred();
6236         check_added_monitors!(nodes[1], 1);
6237
6238         let events = nodes[1].node.get_and_clear_pending_msg_events();
6239         assert_eq!(events.len(), 1);
6240         let (update_msg, commitment_signed) = match events[0] {
6241                 MessageSendEvent::UpdateHTLCs { updates: msgs::CommitmentUpdate { ref update_fee, ref commitment_signed, .. }, .. } => {
6242                         (update_fee.as_ref(), commitment_signed)
6243                 },
6244                 _ => panic!("Unexpected event"),
6245         };
6246
6247         nodes[2].node.handle_update_fee(&nodes[1].node.get_our_node_id(), update_msg.unwrap());
6248
6249         let mut chan_stat = get_channel_value_stat!(nodes[0], chan_0_1.2);
6250         let channel_reserve = chan_stat.channel_reserve_msat;
6251         let feerate = get_feerate!(nodes[0], chan_0_1.2);
6252
6253         // Send a payment which passes reserve checks but gets stuck in the holding cell.
6254         let feemsat = 239;
6255         let total_routing_fee_msat = (nodes.len() - 2) as u64 * feemsat;
6256         let (_, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[2]);
6257         let max_can_send = 5000000 - channel_reserve - 2*commit_tx_fee_msat(feerate, 1 + 1) - total_routing_fee_msat;
6258         let payment_event = {
6259                 let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
6260                 let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[2].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], max_can_send, TEST_FINAL_CLTV, &logger).unwrap();
6261                 nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
6262                 check_added_monitors!(nodes[0], 1);
6263
6264                 let mut events = nodes[0].node.get_and_clear_pending_msg_events();
6265                 assert_eq!(events.len(), 1);
6266
6267                 SendEvent::from_event(events.remove(0))
6268         };
6269         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
6270         check_added_monitors!(nodes[1], 0);
6271         commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
6272         expect_pending_htlcs_forwardable!(nodes[1]);
6273
6274         chan_stat = get_channel_value_stat!(nodes[1], chan_1_2.2);
6275         assert_eq!(chan_stat.holding_cell_outbound_amount_msat, max_can_send);
6276
6277         // Flush the pending fee update.
6278         nodes[2].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), commitment_signed);
6279         let (raa, commitment_signed) = get_revoke_commit_msgs!(nodes[2], nodes[1].node.get_our_node_id());
6280         check_added_monitors!(nodes[2], 1);
6281         nodes[1].node.handle_revoke_and_ack(&nodes[2].node.get_our_node_id(), &raa);
6282         nodes[1].node.handle_commitment_signed(&nodes[2].node.get_our_node_id(), &commitment_signed);
6283         check_added_monitors!(nodes[1], 2);
6284
6285         // A final RAA message is generated to finalize the fee update.
6286         let events = nodes[1].node.get_and_clear_pending_msg_events();
6287         assert_eq!(events.len(), 1);
6288
6289         let raa_msg = match &events[0] {
6290                 &MessageSendEvent::SendRevokeAndACK { ref msg, .. } => {
6291                         msg.clone()
6292                 },
6293                 _ => panic!("Unexpected event"),
6294         };
6295
6296         nodes[2].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &raa_msg);
6297         check_added_monitors!(nodes[2], 1);
6298         assert!(nodes[2].node.get_and_clear_pending_msg_events().is_empty());
6299
6300         // nodes[1]'s ChannelManager will now signal that we have HTLC forwards to process.
6301         let process_htlc_forwards_event = nodes[1].node.get_and_clear_pending_events();
6302         assert_eq!(process_htlc_forwards_event.len(), 1);
6303         match &process_htlc_forwards_event[0] {
6304                 &Event::PendingHTLCsForwardable { .. } => {},
6305                 _ => panic!("Unexpected event"),
6306         }
6307
6308         // In response, we call ChannelManager's process_pending_htlc_forwards
6309         nodes[1].node.process_pending_htlc_forwards();
6310         check_added_monitors!(nodes[1], 1);
6311
6312         // This causes the HTLC to be failed backwards.
6313         let fail_event = nodes[1].node.get_and_clear_pending_msg_events();
6314         assert_eq!(fail_event.len(), 1);
6315         let (fail_msg, commitment_signed) = match &fail_event[0] {
6316                 &MessageSendEvent::UpdateHTLCs { ref updates, .. } => {
6317                         assert_eq!(updates.update_add_htlcs.len(), 0);
6318                         assert_eq!(updates.update_fulfill_htlcs.len(), 0);
6319                         assert_eq!(updates.update_fail_malformed_htlcs.len(), 0);
6320                         assert_eq!(updates.update_fail_htlcs.len(), 1);
6321                         (updates.update_fail_htlcs[0].clone(), updates.commitment_signed.clone())
6322                 },
6323                 _ => panic!("Unexpected event"),
6324         };
6325
6326         // Pass the failure messages back to nodes[0].
6327         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &fail_msg);
6328         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &commitment_signed);
6329
6330         // Complete the HTLC failure+removal process.
6331         let (raa, commitment_signed) = get_revoke_commit_msgs!(nodes[0], nodes[1].node.get_our_node_id());
6332         check_added_monitors!(nodes[0], 1);
6333         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &raa);
6334         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &commitment_signed);
6335         check_added_monitors!(nodes[1], 2);
6336         let final_raa_event = nodes[1].node.get_and_clear_pending_msg_events();
6337         assert_eq!(final_raa_event.len(), 1);
6338         let raa = match &final_raa_event[0] {
6339                 &MessageSendEvent::SendRevokeAndACK { ref msg, .. } => msg.clone(),
6340                 _ => panic!("Unexpected event"),
6341         };
6342         nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &raa);
6343         expect_payment_failed_with_update!(nodes[0], our_payment_hash, false, chan_1_2.0.contents.short_channel_id, false);
6344         check_added_monitors!(nodes[0], 1);
6345 }
6346
6347 // BOLT 2 Requirements for the Sender when constructing and sending an update_add_htlc message.
6348 // BOLT 2 Requirement: MUST NOT offer amount_msat it cannot pay for in the remote commitment transaction at the current feerate_per_kw (see "Updating Fees") while maintaining its channel reserve.
6349 //TODO: I don't believe this is explicitly enforced when sending an HTLC but as the Fee aspect of the BOLT specs is in flux leaving this as a TODO.
6350
6351 #[test]
6352 fn test_update_add_htlc_bolt2_sender_value_below_minimum_msat() {
6353         //BOLT2 Requirement: MUST NOT offer amount_msat below the receiving node's htlc_minimum_msat (same validation check catches both of these)
6354         let chanmon_cfgs = create_chanmon_cfgs(2);
6355         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
6356         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
6357         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
6358         let _chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 95000000, InitFeatures::known(), InitFeatures::known());
6359
6360         let (_, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[1]);
6361         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
6362         let logger = test_utils::TestLogger::new();
6363         let mut route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], 100000, TEST_FINAL_CLTV, &logger).unwrap();
6364         route.paths[0][0].fee_msat = 100;
6365
6366         unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)), true, APIError::ChannelUnavailable { ref err },
6367                 assert!(regex::Regex::new(r"Cannot send less than their minimum HTLC value \(\d+\)").unwrap().is_match(err)));
6368         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
6369         nodes[0].logger.assert_log_contains("lightning::ln::channelmanager".to_string(), "Cannot send less than their minimum HTLC value".to_string(), 1);
6370 }
6371
6372 #[test]
6373 fn test_update_add_htlc_bolt2_sender_zero_value_msat() {
6374         //BOLT2 Requirement: MUST offer amount_msat greater than 0.
6375         let chanmon_cfgs = create_chanmon_cfgs(2);
6376         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
6377         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
6378         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
6379         let _chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 95000000, InitFeatures::known(), InitFeatures::known());
6380         let (_, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[1]);
6381
6382         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
6383         let logger = test_utils::TestLogger::new();
6384         let mut route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], 100000, TEST_FINAL_CLTV, &logger).unwrap();
6385         route.paths[0][0].fee_msat = 0;
6386         unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)), true, APIError::ChannelUnavailable { ref err },
6387                 assert_eq!(err, "Cannot send 0-msat HTLC"));
6388
6389         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
6390         nodes[0].logger.assert_log_contains("lightning::ln::channelmanager".to_string(), "Cannot send 0-msat HTLC".to_string(), 1);
6391 }
6392
6393 #[test]
6394 fn test_update_add_htlc_bolt2_receiver_zero_value_msat() {
6395         //BOLT2 Requirement: MUST offer amount_msat greater than 0.
6396         let chanmon_cfgs = create_chanmon_cfgs(2);
6397         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
6398         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
6399         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
6400         let _chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 95000000, InitFeatures::known(), InitFeatures::known());
6401
6402         let (_, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[1]);
6403         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
6404         let logger = test_utils::TestLogger::new();
6405         let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], 100000, TEST_FINAL_CLTV, &logger).unwrap();
6406         nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
6407         check_added_monitors!(nodes[0], 1);
6408         let mut updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
6409         updates.update_add_htlcs[0].amount_msat = 0;
6410
6411         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &updates.update_add_htlcs[0]);
6412         nodes[1].logger.assert_log("lightning::ln::channelmanager".to_string(), "Remote side tried to send a 0-msat HTLC".to_string(), 1);
6413         check_closed_broadcast!(nodes[1], true).unwrap();
6414         check_added_monitors!(nodes[1], 1);
6415         check_closed_event!(nodes[1], 1, ClosureReason::ProcessingError { err: "Remote side tried to send a 0-msat HTLC".to_string() });
6416 }
6417
6418 #[test]
6419 fn test_update_add_htlc_bolt2_sender_cltv_expiry_too_high() {
6420         //BOLT 2 Requirement: MUST set cltv_expiry less than 500000000.
6421         //It is enforced when constructing a route.
6422         let chanmon_cfgs = create_chanmon_cfgs(2);
6423         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
6424         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
6425         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
6426         let _chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1000000, 0, InitFeatures::known(), InitFeatures::known());
6427         let logger = test_utils::TestLogger::new();
6428
6429         let (_, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[1]);
6430
6431         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
6432         let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], 100000000, 500000001, &logger).unwrap();
6433         unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)), true, APIError::RouteError { ref err },
6434                 assert_eq!(err, &"Channel CLTV overflowed?"));
6435 }
6436
6437 #[test]
6438 fn test_update_add_htlc_bolt2_sender_exceed_max_htlc_num_and_htlc_id_increment() {
6439         //BOLT 2 Requirement: if result would be offering more than the remote's max_accepted_htlcs HTLCs, in the remote commitment transaction: MUST NOT add an HTLC.
6440         //BOLT 2 Requirement: for the first HTLC it offers MUST set id to 0.
6441         //BOLT 2 Requirement: MUST increase the value of id by 1 for each successive offer.
6442         let chanmon_cfgs = create_chanmon_cfgs(2);
6443         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
6444         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
6445         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
6446         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1000000, 0, InitFeatures::known(), InitFeatures::known());
6447         let max_accepted_htlcs = nodes[1].node.channel_state.lock().unwrap().by_id.get(&chan.2).unwrap().counterparty_max_accepted_htlcs as u64;
6448
6449         let logger = test_utils::TestLogger::new();
6450         for i in 0..max_accepted_htlcs {
6451                 let (_, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[1]);
6452                 let payment_event = {
6453                         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
6454                         let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], 100000, TEST_FINAL_CLTV, &logger).unwrap();
6455                         nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
6456                         check_added_monitors!(nodes[0], 1);
6457
6458                         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
6459                         assert_eq!(events.len(), 1);
6460                         if let MessageSendEvent::UpdateHTLCs { node_id: _, updates: msgs::CommitmentUpdate{ update_add_htlcs: ref htlcs, .. }, } = events[0] {
6461                                 assert_eq!(htlcs[0].htlc_id, i);
6462                         } else {
6463                                 assert!(false);
6464                         }
6465                         SendEvent::from_event(events.remove(0))
6466                 };
6467                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
6468                 check_added_monitors!(nodes[1], 0);
6469                 commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
6470
6471                 expect_pending_htlcs_forwardable!(nodes[1]);
6472                 expect_payment_received!(nodes[1], our_payment_hash, our_payment_secret, 100000);
6473         }
6474         let (_, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[1]);
6475         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
6476         let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], 100000, TEST_FINAL_CLTV, &logger).unwrap();
6477         unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)), true, APIError::ChannelUnavailable { ref err },
6478                 assert!(regex::Regex::new(r"Cannot push more than their max accepted HTLCs \(\d+\)").unwrap().is_match(err)));
6479
6480         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
6481         nodes[0].logger.assert_log_contains("lightning::ln::channelmanager".to_string(), "Cannot push more than their max accepted HTLCs".to_string(), 1);
6482 }
6483
6484 #[test]
6485 fn test_update_add_htlc_bolt2_sender_exceed_max_htlc_value_in_flight() {
6486         //BOLT 2 Requirement: if the sum of total offered HTLCs would exceed the remote's max_htlc_value_in_flight_msat: MUST NOT add an HTLC.
6487         let chanmon_cfgs = create_chanmon_cfgs(2);
6488         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
6489         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
6490         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
6491         let channel_value = 100000;
6492         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, channel_value, 0, InitFeatures::known(), InitFeatures::known());
6493         let max_in_flight = get_channel_value_stat!(nodes[0], chan.2).counterparty_max_htlc_value_in_flight_msat;
6494
6495         send_payment(&nodes[0], &vec!(&nodes[1])[..], max_in_flight);
6496
6497         let (_, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[1]);
6498         // Manually create a route over our max in flight (which our router normally automatically
6499         // limits us to.
6500         let route = Route { paths: vec![vec![RouteHop {
6501            pubkey: nodes[1].node.get_our_node_id(), node_features: NodeFeatures::known(), channel_features: ChannelFeatures::known(),
6502            short_channel_id: nodes[1].node.list_usable_channels()[0].short_channel_id.unwrap(),
6503            fee_msat: max_in_flight + 1, cltv_expiry_delta: TEST_FINAL_CLTV
6504         }]] };
6505         unwrap_send_err!(nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)), true, APIError::ChannelUnavailable { ref err },
6506                 assert!(regex::Regex::new(r"Cannot send value that would put us over the max HTLC value in flight our peer will accept \(\d+\)").unwrap().is_match(err)));
6507
6508         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
6509         nodes[0].logger.assert_log_contains("lightning::ln::channelmanager".to_string(), "Cannot send value that would put us over the max HTLC value in flight our peer will accept".to_string(), 1);
6510
6511         send_payment(&nodes[0], &[&nodes[1]], max_in_flight);
6512 }
6513
6514 // BOLT 2 Requirements for the Receiver when handling an update_add_htlc message.
6515 #[test]
6516 fn test_update_add_htlc_bolt2_receiver_check_amount_received_more_than_min() {
6517         //BOLT2 Requirement: receiving an amount_msat equal to 0, OR less than its own htlc_minimum_msat -> SHOULD fail the channel.
6518         let chanmon_cfgs = create_chanmon_cfgs(2);
6519         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
6520         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
6521         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
6522         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 95000000, InitFeatures::known(), InitFeatures::known());
6523         let htlc_minimum_msat: u64;
6524         {
6525                 let chan_lock = nodes[0].node.channel_state.lock().unwrap();
6526                 let channel = chan_lock.by_id.get(&chan.2).unwrap();
6527                 htlc_minimum_msat = channel.get_holder_htlc_minimum_msat();
6528         }
6529
6530         let (_, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[1]);
6531         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
6532         let logger = test_utils::TestLogger::new();
6533         let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], htlc_minimum_msat, TEST_FINAL_CLTV, &logger).unwrap();
6534         nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
6535         check_added_monitors!(nodes[0], 1);
6536         let mut updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
6537         updates.update_add_htlcs[0].amount_msat = htlc_minimum_msat-1;
6538         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &updates.update_add_htlcs[0]);
6539         assert!(nodes[1].node.list_channels().is_empty());
6540         let err_msg = check_closed_broadcast!(nodes[1], true).unwrap();
6541         assert!(regex::Regex::new(r"Remote side tried to send less than our minimum HTLC value\. Lower limit: \(\d+\)\. Actual: \(\d+\)").unwrap().is_match(err_msg.data.as_str()));
6542         check_added_monitors!(nodes[1], 1);
6543         check_closed_event!(nodes[1], 1, ClosureReason::ProcessingError { err: err_msg.data });
6544 }
6545
6546 #[test]
6547 fn test_update_add_htlc_bolt2_receiver_sender_can_afford_amount_sent() {
6548         //BOLT2 Requirement: receiving an amount_msat that the sending node cannot afford at the current feerate_per_kw (while maintaining its channel reserve): SHOULD fail the channel
6549         let chanmon_cfgs = create_chanmon_cfgs(2);
6550         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
6551         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
6552         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
6553         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 95000000, InitFeatures::known(), InitFeatures::known());
6554         let logger = test_utils::TestLogger::new();
6555
6556         let chan_stat = get_channel_value_stat!(nodes[0], chan.2);
6557         let channel_reserve = chan_stat.channel_reserve_msat;
6558         let feerate = get_feerate!(nodes[0], chan.2);
6559         // The 2* and +1 are for the fee spike reserve.
6560         let commit_tx_fee_outbound = 2 * commit_tx_fee_msat(feerate, 1 + 1);
6561
6562         let max_can_send = 5000000 - channel_reserve - commit_tx_fee_outbound;
6563         let (_, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[1]);
6564         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
6565         let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], max_can_send, TEST_FINAL_CLTV, &logger).unwrap();
6566         nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
6567         check_added_monitors!(nodes[0], 1);
6568         let mut updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
6569
6570         // Even though channel-initiator senders are required to respect the fee_spike_reserve,
6571         // at this time channel-initiatee receivers are not required to enforce that senders
6572         // respect the fee_spike_reserve.
6573         updates.update_add_htlcs[0].amount_msat = max_can_send + commit_tx_fee_outbound + 1;
6574         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &updates.update_add_htlcs[0]);
6575
6576         assert!(nodes[1].node.list_channels().is_empty());
6577         let err_msg = check_closed_broadcast!(nodes[1], true).unwrap();
6578         assert_eq!(err_msg.data, "Remote HTLC add would put them under remote reserve value");
6579         check_added_monitors!(nodes[1], 1);
6580         check_closed_event!(nodes[1], 1, ClosureReason::ProcessingError { err: err_msg.data });
6581 }
6582
6583 #[test]
6584 fn test_update_add_htlc_bolt2_receiver_check_max_htlc_limit() {
6585         //BOLT 2 Requirement: if a sending node adds more than its max_accepted_htlcs HTLCs to its local commitment transaction: SHOULD fail the channel
6586         //BOLT 2 Requirement: MUST allow multiple HTLCs with the same payment_hash.
6587         let chanmon_cfgs = create_chanmon_cfgs(2);
6588         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
6589         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
6590         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
6591         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 95000000, InitFeatures::known(), InitFeatures::known());
6592         let logger = test_utils::TestLogger::new();
6593
6594         let (_, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[1]);
6595         let session_priv = SecretKey::from_slice(&[42; 32]).unwrap();
6596
6597         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
6598         let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], 3999999, TEST_FINAL_CLTV, &logger).unwrap();
6599
6600         let cur_height = nodes[0].node.best_block.read().unwrap().height() + 1;
6601         let onion_keys = onion_utils::construct_onion_keys(&Secp256k1::signing_only(), &route.paths[0], &session_priv).unwrap();
6602         let (onion_payloads, _htlc_msat, htlc_cltv) = onion_utils::build_onion_payloads(&route.paths[0], 3999999, &Some(our_payment_secret), cur_height, &None).unwrap();
6603         let onion_packet = onion_utils::construct_onion_packet(onion_payloads, onion_keys, [0; 32], &our_payment_hash);
6604
6605         let mut msg = msgs::UpdateAddHTLC {
6606                 channel_id: chan.2,
6607                 htlc_id: 0,
6608                 amount_msat: 1000,
6609                 payment_hash: our_payment_hash,
6610                 cltv_expiry: htlc_cltv,
6611                 onion_routing_packet: onion_packet.clone(),
6612         };
6613
6614         for i in 0..super::channel::OUR_MAX_HTLCS {
6615                 msg.htlc_id = i as u64;
6616                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &msg);
6617         }
6618         msg.htlc_id = (super::channel::OUR_MAX_HTLCS) as u64;
6619         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &msg);
6620
6621         assert!(nodes[1].node.list_channels().is_empty());
6622         let err_msg = check_closed_broadcast!(nodes[1], true).unwrap();
6623         assert!(regex::Regex::new(r"Remote tried to push more than our max accepted HTLCs \(\d+\)").unwrap().is_match(err_msg.data.as_str()));
6624         check_added_monitors!(nodes[1], 1);
6625         check_closed_event!(nodes[1], 1, ClosureReason::ProcessingError { err: err_msg.data });
6626 }
6627
6628 #[test]
6629 fn test_update_add_htlc_bolt2_receiver_check_max_in_flight_msat() {
6630         //OR adds more than its max_htlc_value_in_flight_msat worth of offered HTLCs to its local commitment transaction: SHOULD fail the channel
6631         let chanmon_cfgs = create_chanmon_cfgs(2);
6632         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
6633         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
6634         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
6635         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1000000, 1000000, InitFeatures::known(), InitFeatures::known());
6636         let logger = test_utils::TestLogger::new();
6637
6638         let (_, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[1]);
6639         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
6640         let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], 1000000, TEST_FINAL_CLTV, &logger).unwrap();
6641         nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
6642         check_added_monitors!(nodes[0], 1);
6643         let mut updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
6644         updates.update_add_htlcs[0].amount_msat = get_channel_value_stat!(nodes[1], chan.2).counterparty_max_htlc_value_in_flight_msat + 1;
6645         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &updates.update_add_htlcs[0]);
6646
6647         assert!(nodes[1].node.list_channels().is_empty());
6648         let err_msg = check_closed_broadcast!(nodes[1], true).unwrap();
6649         assert!(regex::Regex::new("Remote HTLC add would put them over our max HTLC value").unwrap().is_match(err_msg.data.as_str()));
6650         check_added_monitors!(nodes[1], 1);
6651         check_closed_event!(nodes[1], 1, ClosureReason::ProcessingError { err: err_msg.data });
6652 }
6653
6654 #[test]
6655 fn test_update_add_htlc_bolt2_receiver_check_cltv_expiry() {
6656         //BOLT2 Requirement: if sending node sets cltv_expiry to greater or equal to 500000000: SHOULD fail the channel.
6657         let chanmon_cfgs = create_chanmon_cfgs(2);
6658         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
6659         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
6660         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
6661         let logger = test_utils::TestLogger::new();
6662
6663         create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 95000000, InitFeatures::known(), InitFeatures::known());
6664         let (_, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[1]);
6665         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
6666         let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], 1000000, TEST_FINAL_CLTV, &logger).unwrap();
6667         nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
6668         check_added_monitors!(nodes[0], 1);
6669         let mut updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
6670         updates.update_add_htlcs[0].cltv_expiry = 500000000;
6671         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &updates.update_add_htlcs[0]);
6672
6673         assert!(nodes[1].node.list_channels().is_empty());
6674         let err_msg = check_closed_broadcast!(nodes[1], true).unwrap();
6675         assert_eq!(err_msg.data,"Remote provided CLTV expiry in seconds instead of block height");
6676         check_added_monitors!(nodes[1], 1);
6677         check_closed_event!(nodes[1], 1, ClosureReason::ProcessingError { err: err_msg.data });
6678 }
6679
6680 #[test]
6681 fn test_update_add_htlc_bolt2_receiver_check_repeated_id_ignore() {
6682         //BOLT 2 requirement: if the sender did not previously acknowledge the commitment of that HTLC: MUST ignore a repeated id value after a reconnection.
6683         // We test this by first testing that that repeated HTLCs pass commitment signature checks
6684         // after disconnect and that non-sequential htlc_ids result in a channel failure.
6685         let chanmon_cfgs = create_chanmon_cfgs(2);
6686         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
6687         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
6688         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
6689         let logger = test_utils::TestLogger::new();
6690
6691         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
6692         let (_, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[1]);
6693         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
6694         let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], 1000000, TEST_FINAL_CLTV, &logger).unwrap();
6695         nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
6696         check_added_monitors!(nodes[0], 1);
6697         let updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
6698         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &updates.update_add_htlcs[0]);
6699
6700         //Disconnect and Reconnect
6701         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
6702         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
6703         nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: InitFeatures::empty() });
6704         let reestablish_1 = get_chan_reestablish_msgs!(nodes[0], nodes[1]);
6705         assert_eq!(reestablish_1.len(), 1);
6706         nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: InitFeatures::empty() });
6707         let reestablish_2 = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
6708         assert_eq!(reestablish_2.len(), 1);
6709         nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &reestablish_2[0]);
6710         handle_chan_reestablish_msgs!(nodes[0], nodes[1]);
6711         nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &reestablish_1[0]);
6712         handle_chan_reestablish_msgs!(nodes[1], nodes[0]);
6713
6714         //Resend HTLC
6715         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &updates.update_add_htlcs[0]);
6716         assert_eq!(updates.commitment_signed.htlc_signatures.len(), 1);
6717         nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &updates.commitment_signed);
6718         check_added_monitors!(nodes[1], 1);
6719         let _bs_responses = get_revoke_commit_msgs!(nodes[1], nodes[0].node.get_our_node_id());
6720
6721         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &updates.update_add_htlcs[0]);
6722
6723         assert!(nodes[1].node.list_channels().is_empty());
6724         let err_msg = check_closed_broadcast!(nodes[1], true).unwrap();
6725         assert!(regex::Regex::new(r"Remote skipped HTLC ID \(skipped ID: \d+\)").unwrap().is_match(err_msg.data.as_str()));
6726         check_added_monitors!(nodes[1], 1);
6727         check_closed_event!(nodes[1], 1, ClosureReason::ProcessingError { err: err_msg.data });
6728 }
6729
6730 #[test]
6731 fn test_update_fulfill_htlc_bolt2_update_fulfill_htlc_before_commitment() {
6732         //BOLT 2 Requirement: until the corresponding HTLC is irrevocably committed in both sides' commitment transactions:     MUST NOT send an update_fulfill_htlc, update_fail_htlc, or update_fail_malformed_htlc.
6733
6734         let chanmon_cfgs = create_chanmon_cfgs(2);
6735         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
6736         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
6737         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
6738         let logger = test_utils::TestLogger::new();
6739         let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
6740         let (our_payment_preimage, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[1]);
6741         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
6742         let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], 1000000, TEST_FINAL_CLTV, &logger).unwrap();
6743         nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
6744
6745         check_added_monitors!(nodes[0], 1);
6746         let updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
6747         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &updates.update_add_htlcs[0]);
6748
6749         let update_msg = msgs::UpdateFulfillHTLC{
6750                 channel_id: chan.2,
6751                 htlc_id: 0,
6752                 payment_preimage: our_payment_preimage,
6753         };
6754
6755         nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &update_msg);
6756
6757         assert!(nodes[0].node.list_channels().is_empty());
6758         let err_msg = check_closed_broadcast!(nodes[0], true).unwrap();
6759         assert!(regex::Regex::new(r"Remote tried to fulfill/fail HTLC \(\d+\) before it had been committed").unwrap().is_match(err_msg.data.as_str()));
6760         check_added_monitors!(nodes[0], 1);
6761         check_closed_event!(nodes[0], 1, ClosureReason::ProcessingError { err: err_msg.data });
6762 }
6763
6764 #[test]
6765 fn test_update_fulfill_htlc_bolt2_update_fail_htlc_before_commitment() {
6766         //BOLT 2 Requirement: until the corresponding HTLC is irrevocably committed in both sides' commitment transactions:     MUST NOT send an update_fulfill_htlc, update_fail_htlc, or update_fail_malformed_htlc.
6767
6768         let chanmon_cfgs = create_chanmon_cfgs(2);
6769         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
6770         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
6771         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
6772         let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
6773         let logger = test_utils::TestLogger::new();
6774
6775         let (_, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[1]);
6776         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
6777         let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], 1000000, TEST_FINAL_CLTV, &logger).unwrap();
6778         nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
6779         check_added_monitors!(nodes[0], 1);
6780         let updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
6781         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &updates.update_add_htlcs[0]);
6782
6783         let update_msg = msgs::UpdateFailHTLC{
6784                 channel_id: chan.2,
6785                 htlc_id: 0,
6786                 reason: msgs::OnionErrorPacket { data: Vec::new()},
6787         };
6788
6789         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &update_msg);
6790
6791         assert!(nodes[0].node.list_channels().is_empty());
6792         let err_msg = check_closed_broadcast!(nodes[0], true).unwrap();
6793         assert!(regex::Regex::new(r"Remote tried to fulfill/fail HTLC \(\d+\) before it had been committed").unwrap().is_match(err_msg.data.as_str()));
6794         check_added_monitors!(nodes[0], 1);
6795         check_closed_event!(nodes[0], 1, ClosureReason::ProcessingError { err: err_msg.data });
6796 }
6797
6798 #[test]
6799 fn test_update_fulfill_htlc_bolt2_update_fail_malformed_htlc_before_commitment() {
6800         //BOLT 2 Requirement: until the corresponding HTLC is irrevocably committed in both sides' commitment transactions:     MUST NOT send an update_fulfill_htlc, update_fail_htlc, or update_fail_malformed_htlc.
6801
6802         let chanmon_cfgs = create_chanmon_cfgs(2);
6803         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
6804         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
6805         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
6806         let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
6807         let logger = test_utils::TestLogger::new();
6808
6809         let (_, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[1]);
6810         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
6811         let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], 1000000, TEST_FINAL_CLTV, &logger).unwrap();
6812         nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
6813         check_added_monitors!(nodes[0], 1);
6814         let updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
6815         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &updates.update_add_htlcs[0]);
6816         let update_msg = msgs::UpdateFailMalformedHTLC{
6817                 channel_id: chan.2,
6818                 htlc_id: 0,
6819                 sha256_of_onion: [1; 32],
6820                 failure_code: 0x8000,
6821         };
6822
6823         nodes[0].node.handle_update_fail_malformed_htlc(&nodes[1].node.get_our_node_id(), &update_msg);
6824
6825         assert!(nodes[0].node.list_channels().is_empty());
6826         let err_msg = check_closed_broadcast!(nodes[0], true).unwrap();
6827         assert!(regex::Regex::new(r"Remote tried to fulfill/fail HTLC \(\d+\) before it had been committed").unwrap().is_match(err_msg.data.as_str()));
6828         check_added_monitors!(nodes[0], 1);
6829         check_closed_event!(nodes[0], 1, ClosureReason::ProcessingError { err: err_msg.data });
6830 }
6831
6832 #[test]
6833 fn test_update_fulfill_htlc_bolt2_incorrect_htlc_id() {
6834         //BOLT 2 Requirement: A receiving node: if the id does not correspond to an HTLC in its current commitment transaction MUST fail the channel.
6835
6836         let chanmon_cfgs = create_chanmon_cfgs(2);
6837         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
6838         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
6839         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
6840         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
6841
6842         let our_payment_preimage = route_payment(&nodes[0], &[&nodes[1]], 100000).0;
6843
6844         nodes[1].node.claim_funds(our_payment_preimage);
6845         check_added_monitors!(nodes[1], 1);
6846
6847         let events = nodes[1].node.get_and_clear_pending_msg_events();
6848         assert_eq!(events.len(), 1);
6849         let mut update_fulfill_msg: msgs::UpdateFulfillHTLC = {
6850                 match events[0] {
6851                         MessageSendEvent::UpdateHTLCs { node_id: _ , updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, ref update_fee, .. } } => {
6852                                 assert!(update_add_htlcs.is_empty());
6853                                 assert_eq!(update_fulfill_htlcs.len(), 1);
6854                                 assert!(update_fail_htlcs.is_empty());
6855                                 assert!(update_fail_malformed_htlcs.is_empty());
6856                                 assert!(update_fee.is_none());
6857                                 update_fulfill_htlcs[0].clone()
6858                         },
6859                         _ => panic!("Unexpected event"),
6860                 }
6861         };
6862
6863         update_fulfill_msg.htlc_id = 1;
6864
6865         nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &update_fulfill_msg);
6866
6867         assert!(nodes[0].node.list_channels().is_empty());
6868         let err_msg = check_closed_broadcast!(nodes[0], true).unwrap();
6869         assert_eq!(err_msg.data, "Remote tried to fulfill/fail an HTLC we couldn't find");
6870         check_added_monitors!(nodes[0], 1);
6871         check_closed_event!(nodes[0], 1, ClosureReason::ProcessingError { err: err_msg.data });
6872 }
6873
6874 #[test]
6875 fn test_update_fulfill_htlc_bolt2_wrong_preimage() {
6876         //BOLT 2 Requirement: A receiving node: if the payment_preimage value in update_fulfill_htlc doesn't SHA256 hash to the corresponding HTLC payment_hash MUST fail the channel.
6877
6878         let chanmon_cfgs = create_chanmon_cfgs(2);
6879         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
6880         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
6881         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
6882         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
6883
6884         let our_payment_preimage = route_payment(&nodes[0], &[&nodes[1]], 100000).0;
6885
6886         nodes[1].node.claim_funds(our_payment_preimage);
6887         check_added_monitors!(nodes[1], 1);
6888
6889         let events = nodes[1].node.get_and_clear_pending_msg_events();
6890         assert_eq!(events.len(), 1);
6891         let mut update_fulfill_msg: msgs::UpdateFulfillHTLC = {
6892                 match events[0] {
6893                         MessageSendEvent::UpdateHTLCs { node_id: _ , updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, ref update_fee, .. } } => {
6894                                 assert!(update_add_htlcs.is_empty());
6895                                 assert_eq!(update_fulfill_htlcs.len(), 1);
6896                                 assert!(update_fail_htlcs.is_empty());
6897                                 assert!(update_fail_malformed_htlcs.is_empty());
6898                                 assert!(update_fee.is_none());
6899                                 update_fulfill_htlcs[0].clone()
6900                         },
6901                         _ => panic!("Unexpected event"),
6902                 }
6903         };
6904
6905         update_fulfill_msg.payment_preimage = PaymentPreimage([1; 32]);
6906
6907         nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &update_fulfill_msg);
6908
6909         assert!(nodes[0].node.list_channels().is_empty());
6910         let err_msg = check_closed_broadcast!(nodes[0], true).unwrap();
6911         assert!(regex::Regex::new(r"Remote tried to fulfill HTLC \(\d+\) with an incorrect preimage").unwrap().is_match(err_msg.data.as_str()));
6912         check_added_monitors!(nodes[0], 1);
6913         check_closed_event!(nodes[0], 1, ClosureReason::ProcessingError { err: err_msg.data });
6914 }
6915
6916 #[test]
6917 fn test_update_fulfill_htlc_bolt2_missing_badonion_bit_for_malformed_htlc_message() {
6918         //BOLT 2 Requirement: A receiving node: if the BADONION bit in failure_code is not set for update_fail_malformed_htlc MUST fail the channel.
6919
6920         let chanmon_cfgs = create_chanmon_cfgs(2);
6921         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
6922         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
6923         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
6924         create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1000000, 1000000, InitFeatures::known(), InitFeatures::known());
6925         let logger = test_utils::TestLogger::new();
6926
6927         let (_, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[1]);
6928         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
6929         let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], 1000000, TEST_FINAL_CLTV, &logger).unwrap();
6930         nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
6931         check_added_monitors!(nodes[0], 1);
6932
6933         let mut updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
6934         updates.update_add_htlcs[0].onion_routing_packet.version = 1; //Produce a malformed HTLC message
6935
6936         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &updates.update_add_htlcs[0]);
6937         check_added_monitors!(nodes[1], 0);
6938         commitment_signed_dance!(nodes[1], nodes[0], updates.commitment_signed, false, true);
6939
6940         let events = nodes[1].node.get_and_clear_pending_msg_events();
6941
6942         let mut update_msg: msgs::UpdateFailMalformedHTLC = {
6943                 match events[0] {
6944                         MessageSendEvent::UpdateHTLCs { node_id: _ , updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, ref update_fee, .. } } => {
6945                                 assert!(update_add_htlcs.is_empty());
6946                                 assert!(update_fulfill_htlcs.is_empty());
6947                                 assert!(update_fail_htlcs.is_empty());
6948                                 assert_eq!(update_fail_malformed_htlcs.len(), 1);
6949                                 assert!(update_fee.is_none());
6950                                 update_fail_malformed_htlcs[0].clone()
6951                         },
6952                         _ => panic!("Unexpected event"),
6953                 }
6954         };
6955         update_msg.failure_code &= !0x8000;
6956         nodes[0].node.handle_update_fail_malformed_htlc(&nodes[1].node.get_our_node_id(), &update_msg);
6957
6958         assert!(nodes[0].node.list_channels().is_empty());
6959         let err_msg = check_closed_broadcast!(nodes[0], true).unwrap();
6960         assert_eq!(err_msg.data, "Got update_fail_malformed_htlc with BADONION not set");
6961         check_added_monitors!(nodes[0], 1);
6962         check_closed_event!(nodes[0], 1, ClosureReason::ProcessingError { err: err_msg.data });
6963 }
6964
6965 #[test]
6966 fn test_update_fulfill_htlc_bolt2_after_malformed_htlc_message_must_forward_update_fail_htlc() {
6967         //BOLT 2 Requirement: a receiving node which has an outgoing HTLC canceled by update_fail_malformed_htlc:
6968         //    * MUST return an error in the update_fail_htlc sent to the link which originally sent the HTLC, using the failure_code given and setting the data to sha256_of_onion.
6969
6970         let chanmon_cfgs = create_chanmon_cfgs(3);
6971         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
6972         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
6973         let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs);
6974         create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1000000, 1000000, InitFeatures::known(), InitFeatures::known());
6975         create_announced_chan_between_nodes_with_value(&nodes, 1, 2, 1000000, 1000000, InitFeatures::known(), InitFeatures::known());
6976         let logger = test_utils::TestLogger::new();
6977
6978         let (_, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[2]);
6979
6980         //First hop
6981         let mut payment_event = {
6982                 let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
6983                 let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[2].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 100000, TEST_FINAL_CLTV, &logger).unwrap();
6984                 nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
6985                 check_added_monitors!(nodes[0], 1);
6986                 let mut events = nodes[0].node.get_and_clear_pending_msg_events();
6987                 assert_eq!(events.len(), 1);
6988                 SendEvent::from_event(events.remove(0))
6989         };
6990         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
6991         check_added_monitors!(nodes[1], 0);
6992         commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
6993         expect_pending_htlcs_forwardable!(nodes[1]);
6994         let mut events_2 = nodes[1].node.get_and_clear_pending_msg_events();
6995         assert_eq!(events_2.len(), 1);
6996         check_added_monitors!(nodes[1], 1);
6997         payment_event = SendEvent::from_event(events_2.remove(0));
6998         assert_eq!(payment_event.msgs.len(), 1);
6999
7000         //Second Hop
7001         payment_event.msgs[0].onion_routing_packet.version = 1; //Produce a malformed HTLC message
7002         nodes[2].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &payment_event.msgs[0]);
7003         check_added_monitors!(nodes[2], 0);
7004         commitment_signed_dance!(nodes[2], nodes[1], payment_event.commitment_msg, false, true);
7005
7006         let events_3 = nodes[2].node.get_and_clear_pending_msg_events();
7007         assert_eq!(events_3.len(), 1);
7008         let update_msg : (msgs::UpdateFailMalformedHTLC, msgs::CommitmentSigned) = {
7009                 match events_3[0] {
7010                         MessageSendEvent::UpdateHTLCs { node_id: _ , updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, ref update_fee, ref commitment_signed } } => {
7011                                 assert!(update_add_htlcs.is_empty());
7012                                 assert!(update_fulfill_htlcs.is_empty());
7013                                 assert!(update_fail_htlcs.is_empty());
7014                                 assert_eq!(update_fail_malformed_htlcs.len(), 1);
7015                                 assert!(update_fee.is_none());
7016                                 (update_fail_malformed_htlcs[0].clone(), commitment_signed.clone())
7017                         },
7018                         _ => panic!("Unexpected event"),
7019                 }
7020         };
7021
7022         nodes[1].node.handle_update_fail_malformed_htlc(&nodes[2].node.get_our_node_id(), &update_msg.0);
7023
7024         check_added_monitors!(nodes[1], 0);
7025         commitment_signed_dance!(nodes[1], nodes[2], update_msg.1, false, true);
7026         expect_pending_htlcs_forwardable!(nodes[1]);
7027         let events_4 = nodes[1].node.get_and_clear_pending_msg_events();
7028         assert_eq!(events_4.len(), 1);
7029
7030         //Confirm that handlinge the update_malformed_htlc message produces an update_fail_htlc message to be forwarded back along the route
7031         match events_4[0] {
7032                 MessageSendEvent::UpdateHTLCs { node_id: _ , updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, ref update_fee, .. } } => {
7033                         assert!(update_add_htlcs.is_empty());
7034                         assert!(update_fulfill_htlcs.is_empty());
7035                         assert_eq!(update_fail_htlcs.len(), 1);
7036                         assert!(update_fail_malformed_htlcs.is_empty());
7037                         assert!(update_fee.is_none());
7038                 },
7039                 _ => panic!("Unexpected event"),
7040         };
7041
7042         check_added_monitors!(nodes[1], 1);
7043 }
7044
7045 fn do_test_failure_delay_dust_htlc_local_commitment(announce_latest: bool) {
7046         // Dust-HTLC failure updates must be delayed until failure-trigger tx (in this case local commitment) reach ANTI_REORG_DELAY
7047         // We can have at most two valid local commitment tx, so both cases must be covered, and both txs must be checked to get them all as
7048         // HTLC could have been removed from lastest local commitment tx but still valid until we get remote RAA
7049
7050         let mut chanmon_cfgs = create_chanmon_cfgs(2);
7051         chanmon_cfgs[0].keys_manager.disable_revocation_policy_check = true;
7052         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
7053         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
7054         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
7055         let chan =create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
7056
7057         let bs_dust_limit = nodes[1].node.channel_state.lock().unwrap().by_id.get(&chan.2).unwrap().holder_dust_limit_satoshis;
7058
7059         // We route 2 dust-HTLCs between A and B
7060         let (_, payment_hash_1, _) = route_payment(&nodes[0], &[&nodes[1]], bs_dust_limit*1000);
7061         let (_, payment_hash_2, _) = route_payment(&nodes[0], &[&nodes[1]], bs_dust_limit*1000);
7062         route_payment(&nodes[0], &[&nodes[1]], 1000000);
7063
7064         // Cache one local commitment tx as previous
7065         let as_prev_commitment_tx = get_local_commitment_txn!(nodes[0], chan.2);
7066
7067         // Fail one HTLC to prune it in the will-be-latest-local commitment tx
7068         assert!(nodes[1].node.fail_htlc_backwards(&payment_hash_2));
7069         check_added_monitors!(nodes[1], 0);
7070         expect_pending_htlcs_forwardable!(nodes[1]);
7071         check_added_monitors!(nodes[1], 1);
7072
7073         let remove = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
7074         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &remove.update_fail_htlcs[0]);
7075         nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &remove.commitment_signed);
7076         check_added_monitors!(nodes[0], 1);
7077
7078         // Cache one local commitment tx as lastest
7079         let as_last_commitment_tx = get_local_commitment_txn!(nodes[0], chan.2);
7080
7081         let events = nodes[0].node.get_and_clear_pending_msg_events();
7082         match events[0] {
7083                 MessageSendEvent::SendRevokeAndACK { node_id, .. } => {
7084                         assert_eq!(node_id, nodes[1].node.get_our_node_id());
7085                 },
7086                 _ => panic!("Unexpected event"),
7087         }
7088         match events[1] {
7089                 MessageSendEvent::UpdateHTLCs { node_id, .. } => {
7090                         assert_eq!(node_id, nodes[1].node.get_our_node_id());
7091                 },
7092                 _ => panic!("Unexpected event"),
7093         }
7094
7095         assert_ne!(as_prev_commitment_tx, as_last_commitment_tx);
7096         // Fail the 2 dust-HTLCs, move their failure in maturation buffer (htlc_updated_waiting_threshold_conf)
7097         if announce_latest {
7098                 mine_transaction(&nodes[0], &as_last_commitment_tx[0]);
7099         } else {
7100                 mine_transaction(&nodes[0], &as_prev_commitment_tx[0]);
7101         }
7102
7103         check_closed_broadcast!(nodes[0], true);
7104         check_added_monitors!(nodes[0], 1);
7105         check_closed_event!(nodes[0], 1, ClosureReason::CommitmentTxConfirmed);
7106
7107         assert_eq!(nodes[0].node.get_and_clear_pending_events().len(), 0);
7108         connect_blocks(&nodes[0], ANTI_REORG_DELAY - 1);
7109         let events = nodes[0].node.get_and_clear_pending_events();
7110         // Only 2 PaymentPathFailed events should show up, over-dust HTLC has to be failed by timeout tx
7111         assert_eq!(events.len(), 2);
7112         let mut first_failed = false;
7113         for event in events {
7114                 match event {
7115                         Event::PaymentPathFailed { payment_hash, .. } => {
7116                                 if payment_hash == payment_hash_1 {
7117                                         assert!(!first_failed);
7118                                         first_failed = true;
7119                                 } else {
7120                                         assert_eq!(payment_hash, payment_hash_2);
7121                                 }
7122                         }
7123                         _ => panic!("Unexpected event"),
7124                 }
7125         }
7126 }
7127
7128 #[test]
7129 fn test_failure_delay_dust_htlc_local_commitment() {
7130         do_test_failure_delay_dust_htlc_local_commitment(true);
7131         do_test_failure_delay_dust_htlc_local_commitment(false);
7132 }
7133
7134 fn do_test_sweep_outbound_htlc_failure_update(revoked: bool, local: bool) {
7135         // Outbound HTLC-failure updates must be cancelled if we get a reorg before we reach ANTI_REORG_DELAY.
7136         // Broadcast of revoked remote commitment tx, trigger failure-update of dust/non-dust HTLCs
7137         // Broadcast of remote commitment tx, trigger failure-update of dust-HTLCs
7138         // Broadcast of timeout tx on remote commitment tx, trigger failure-udate of non-dust HTLCs
7139         // Broadcast of local commitment tx, trigger failure-update of dust-HTLCs
7140         // Broadcast of HTLC-timeout tx on local commitment tx, trigger failure-update of non-dust HTLCs
7141
7142         let chanmon_cfgs = create_chanmon_cfgs(3);
7143         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
7144         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
7145         let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
7146         let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
7147
7148         let bs_dust_limit = nodes[1].node.channel_state.lock().unwrap().by_id.get(&chan.2).unwrap().holder_dust_limit_satoshis;
7149
7150         let (_payment_preimage_1, dust_hash, _payment_secret_1) = route_payment(&nodes[0], &[&nodes[1]], bs_dust_limit*1000);
7151         let (_payment_preimage_2, non_dust_hash, _payment_secret_2) = route_payment(&nodes[0], &[&nodes[1]], 1000000);
7152
7153         let as_commitment_tx = get_local_commitment_txn!(nodes[0], chan.2);
7154         let bs_commitment_tx = get_local_commitment_txn!(nodes[1], chan.2);
7155
7156         // We revoked bs_commitment_tx
7157         if revoked {
7158                 let (payment_preimage_3, _, _) = route_payment(&nodes[0], &[&nodes[1]], 1000000);
7159                 claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage_3);
7160         }
7161
7162         let mut timeout_tx = Vec::new();
7163         if local {
7164                 // We fail dust-HTLC 1 by broadcast of local commitment tx
7165                 mine_transaction(&nodes[0], &as_commitment_tx[0]);
7166                 check_closed_event!(nodes[0], 1, ClosureReason::CommitmentTxConfirmed);
7167                 connect_blocks(&nodes[0], ANTI_REORG_DELAY - 1);
7168                 expect_payment_failed!(nodes[0], dust_hash, true);
7169
7170                 connect_blocks(&nodes[0], TEST_FINAL_CLTV + LATENCY_GRACE_PERIOD_BLOCKS - ANTI_REORG_DELAY);
7171                 check_closed_broadcast!(nodes[0], true);
7172                 check_added_monitors!(nodes[0], 1);
7173                 assert_eq!(nodes[0].node.get_and_clear_pending_events().len(), 0);
7174                 timeout_tx.push(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap()[1].clone());
7175                 assert_eq!(timeout_tx[0].input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
7176                 // We fail non-dust-HTLC 2 by broadcast of local HTLC-timeout tx on local commitment tx
7177                 assert_eq!(nodes[0].node.get_and_clear_pending_events().len(), 0);
7178                 mine_transaction(&nodes[0], &timeout_tx[0]);
7179                 connect_blocks(&nodes[0], ANTI_REORG_DELAY - 1);
7180                 expect_payment_failed!(nodes[0], non_dust_hash, true);
7181         } else {
7182                 // We fail dust-HTLC 1 by broadcast of remote commitment tx. If revoked, fail also non-dust HTLC
7183                 mine_transaction(&nodes[0], &bs_commitment_tx[0]);
7184                 check_closed_broadcast!(nodes[0], true);
7185                 check_added_monitors!(nodes[0], 1);
7186                 check_closed_event!(nodes[0], 1, ClosureReason::CommitmentTxConfirmed);
7187                 assert_eq!(nodes[0].node.get_and_clear_pending_events().len(), 0);
7188                 connect_blocks(&nodes[0], TEST_FINAL_CLTV - 1); // Confirm blocks until the HTLC expires
7189                 timeout_tx.push(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap()[1].clone());
7190                 if !revoked {
7191                         expect_payment_failed!(nodes[0], dust_hash, true);
7192                         assert_eq!(timeout_tx[0].input[0].witness.last().unwrap().len(), ACCEPTED_HTLC_SCRIPT_WEIGHT);
7193                         // We fail non-dust-HTLC 2 by broadcast of local timeout tx on remote commitment tx
7194                         mine_transaction(&nodes[0], &timeout_tx[0]);
7195                         assert_eq!(nodes[0].node.get_and_clear_pending_events().len(), 0);
7196                         connect_blocks(&nodes[0], ANTI_REORG_DELAY - 1);
7197                         expect_payment_failed!(nodes[0], non_dust_hash, true);
7198                 } else {
7199                         // If revoked, both dust & non-dust HTLCs should have been failed after ANTI_REORG_DELAY confs of revoked
7200                         // commitment tx
7201                         let events = nodes[0].node.get_and_clear_pending_events();
7202                         assert_eq!(events.len(), 2);
7203                         let first;
7204                         match events[0] {
7205                                 Event::PaymentPathFailed { payment_hash, .. } => {
7206                                         if payment_hash == dust_hash { first = true; }
7207                                         else { first = false; }
7208                                 },
7209                                 _ => panic!("Unexpected event"),
7210                         }
7211                         match events[1] {
7212                                 Event::PaymentPathFailed { payment_hash, .. } => {
7213                                         if first { assert_eq!(payment_hash, non_dust_hash); }
7214                                         else { assert_eq!(payment_hash, dust_hash); }
7215                                 },
7216                                 _ => panic!("Unexpected event"),
7217                         }
7218                 }
7219         }
7220 }
7221
7222 #[test]
7223 fn test_sweep_outbound_htlc_failure_update() {
7224         do_test_sweep_outbound_htlc_failure_update(false, true);
7225         do_test_sweep_outbound_htlc_failure_update(false, false);
7226         do_test_sweep_outbound_htlc_failure_update(true, false);
7227 }
7228
7229 #[test]
7230 fn test_user_configurable_csv_delay() {
7231         // We test our channel constructors yield errors when we pass them absurd csv delay
7232
7233         let mut low_our_to_self_config = UserConfig::default();
7234         low_our_to_self_config.own_channel_config.our_to_self_delay = 6;
7235         let mut high_their_to_self_config = UserConfig::default();
7236         high_their_to_self_config.peer_channel_config_limits.their_to_self_delay = 100;
7237         let user_cfgs = [Some(high_their_to_self_config.clone()), None];
7238         let chanmon_cfgs = create_chanmon_cfgs(2);
7239         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
7240         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &user_cfgs);
7241         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
7242
7243         // We test config.our_to_self > BREAKDOWN_TIMEOUT is enforced in Channel::new_outbound()
7244         if let Err(error) = Channel::new_outbound(&&test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(253) }, &nodes[0].keys_manager, nodes[1].node.get_our_node_id(), &InitFeatures::known(), 1000000, 1000000, 0, &low_our_to_self_config) {
7245                 match error {
7246                         APIError::APIMisuseError { err } => { assert!(regex::Regex::new(r"Configured with an unreasonable our_to_self_delay \(\d+\) putting user funds at risks").unwrap().is_match(err.as_str())); },
7247                         _ => panic!("Unexpected event"),
7248                 }
7249         } else { assert!(false) }
7250
7251         // We test config.our_to_self > BREAKDOWN_TIMEOUT is enforced in Channel::new_from_req()
7252         nodes[1].node.create_channel(nodes[0].node.get_our_node_id(), 1000000, 1000000, 42, None).unwrap();
7253         let mut open_channel = get_event_msg!(nodes[1], MessageSendEvent::SendOpenChannel, nodes[0].node.get_our_node_id());
7254         open_channel.to_self_delay = 200;
7255         if let Err(error) = Channel::new_from_req(&&test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(253) }, &nodes[0].keys_manager, nodes[1].node.get_our_node_id(), &InitFeatures::known(), &open_channel, 0, &low_our_to_self_config) {
7256                 match error {
7257                         ChannelError::Close(err) => { assert!(regex::Regex::new(r"Configured with an unreasonable our_to_self_delay \(\d+\) putting user funds at risks").unwrap().is_match(err.as_str()));  },
7258                         _ => panic!("Unexpected event"),
7259                 }
7260         } else { assert!(false); }
7261
7262         // We test msg.to_self_delay <= config.their_to_self_delay is enforced in Chanel::accept_channel()
7263         nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), 1000000, 1000000, 42, None).unwrap();
7264         nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), InitFeatures::known(), &get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id()));
7265         let mut accept_channel = get_event_msg!(nodes[1], MessageSendEvent::SendAcceptChannel, nodes[0].node.get_our_node_id());
7266         accept_channel.to_self_delay = 200;
7267         nodes[0].node.handle_accept_channel(&nodes[1].node.get_our_node_id(), InitFeatures::known(), &accept_channel);
7268         let reason_msg;
7269         if let MessageSendEvent::HandleError { ref action, .. } = nodes[0].node.get_and_clear_pending_msg_events()[0] {
7270                 match action {
7271                         &ErrorAction::SendErrorMessage { ref msg } => {
7272                                 assert!(regex::Regex::new(r"They wanted our payments to be delayed by a needlessly long period\. Upper limit: \d+\. Actual: \d+").unwrap().is_match(msg.data.as_str()));
7273                                 reason_msg = msg.data.clone();
7274                         },
7275                         _ => { panic!(); }
7276                 }
7277         } else { panic!(); }
7278         check_closed_event!(nodes[0], 1, ClosureReason::ProcessingError { err: reason_msg });
7279
7280         // We test msg.to_self_delay <= config.their_to_self_delay is enforced in Channel::new_from_req()
7281         nodes[1].node.create_channel(nodes[0].node.get_our_node_id(), 1000000, 1000000, 42, None).unwrap();
7282         let mut open_channel = get_event_msg!(nodes[1], MessageSendEvent::SendOpenChannel, nodes[0].node.get_our_node_id());
7283         open_channel.to_self_delay = 200;
7284         if let Err(error) = Channel::new_from_req(&&test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(253) }, &nodes[0].keys_manager, nodes[1].node.get_our_node_id(), &InitFeatures::known(), &open_channel, 0, &high_their_to_self_config) {
7285                 match error {
7286                         ChannelError::Close(err) => { assert!(regex::Regex::new(r"They wanted our payments to be delayed by a needlessly long period\. Upper limit: \d+\. Actual: \d+").unwrap().is_match(err.as_str())); },
7287                         _ => panic!("Unexpected event"),
7288                 }
7289         } else { assert!(false); }
7290 }
7291
7292 #[test]
7293 fn test_data_loss_protect() {
7294         // We want to be sure that :
7295         // * we don't broadcast our Local Commitment Tx in case of fallen behind
7296         //   (but this is not quite true - we broadcast during Drop because chanmon is out of sync with chanmgr)
7297         // * we close channel in case of detecting other being fallen behind
7298         // * we are able to claim our own outputs thanks to to_remote being static
7299         // TODO: this test is incomplete and the data_loss_protect implementation is incomplete - see issue #775
7300         let persister;
7301         let logger;
7302         let fee_estimator;
7303         let tx_broadcaster;
7304         let chain_source;
7305         let mut chanmon_cfgs = create_chanmon_cfgs(2);
7306         // We broadcast during Drop because chanmon is out of sync with chanmgr, which would cause a panic
7307         // during signing due to revoked tx
7308         chanmon_cfgs[0].keys_manager.disable_revocation_policy_check = true;
7309         let keys_manager = &chanmon_cfgs[0].keys_manager;
7310         let monitor;
7311         let node_state_0;
7312         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
7313         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
7314         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
7315
7316         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1000000, 1000000, InitFeatures::known(), InitFeatures::known());
7317
7318         // Cache node A state before any channel update
7319         let previous_node_state = nodes[0].node.encode();
7320         let mut previous_chain_monitor_state = test_utils::TestVecWriter(Vec::new());
7321         nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap().iter().next().unwrap().1.write(&mut previous_chain_monitor_state).unwrap();
7322
7323         send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
7324         send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
7325
7326         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
7327         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
7328
7329         // Restore node A from previous state
7330         logger = test_utils::TestLogger::with_id(format!("node {}", 0));
7331         let mut chain_monitor = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(&mut io::Cursor::new(previous_chain_monitor_state.0), keys_manager).unwrap().1;
7332         chain_source = test_utils::TestChainSource::new(Network::Testnet);
7333         tx_broadcaster = test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new()), blocks: Arc::new(Mutex::new(Vec::new()))};
7334         fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(253) };
7335         persister = test_utils::TestPersister::new();
7336         monitor = test_utils::TestChainMonitor::new(Some(&chain_source), &tx_broadcaster, &logger, &fee_estimator, &persister, keys_manager);
7337         node_state_0 = {
7338                 let mut channel_monitors = HashMap::new();
7339                 channel_monitors.insert(OutPoint { txid: chan.3.txid(), index: 0 }, &mut chain_monitor);
7340                 <(BlockHash, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut io::Cursor::new(previous_node_state), ChannelManagerReadArgs {
7341                         keys_manager: keys_manager,
7342                         fee_estimator: &fee_estimator,
7343                         chain_monitor: &monitor,
7344                         logger: &logger,
7345                         tx_broadcaster: &tx_broadcaster,
7346                         default_config: UserConfig::default(),
7347                         channel_monitors,
7348                 }).unwrap().1
7349         };
7350         nodes[0].node = &node_state_0;
7351         assert!(monitor.watch_channel(OutPoint { txid: chan.3.txid(), index: 0 }, chain_monitor).is_ok());
7352         nodes[0].chain_monitor = &monitor;
7353         nodes[0].chain_source = &chain_source;
7354
7355         check_added_monitors!(nodes[0], 1);
7356
7357         nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: InitFeatures::empty() });
7358         nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: InitFeatures::empty() });
7359
7360         let reestablish_0 = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
7361
7362         // Check we don't broadcast any transactions following learning of per_commitment_point from B
7363         nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &reestablish_0[0]);
7364         check_added_monitors!(nodes[0], 1);
7365
7366         {
7367                 let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().clone();
7368                 assert_eq!(node_txn.len(), 0);
7369         }
7370
7371         let mut reestablish_1 = Vec::with_capacity(1);
7372         for msg in nodes[0].node.get_and_clear_pending_msg_events() {
7373                 if let MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } = msg {
7374                         assert_eq!(*node_id, nodes[1].node.get_our_node_id());
7375                         reestablish_1.push(msg.clone());
7376                 } else if let MessageSendEvent::BroadcastChannelUpdate { .. } = msg {
7377                 } else if let MessageSendEvent::HandleError { ref action, .. } = msg {
7378                         match action {
7379                                 &ErrorAction::SendErrorMessage { ref msg } => {
7380                                         assert_eq!(msg.data, "We have fallen behind - we have received proof that if we broadcast remote is going to claim our funds - we can't do any automated broadcasting");
7381                                 },
7382                                 _ => panic!("Unexpected event!"),
7383                         }
7384                 } else {
7385                         panic!("Unexpected event")
7386                 }
7387         }
7388
7389         // Check we close channel detecting A is fallen-behind
7390         nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &reestablish_1[0]);
7391         check_closed_event!(nodes[1], 1, ClosureReason::ProcessingError { err: "Peer attempted to reestablish channel with a very old local commitment transaction".to_string() });
7392         assert_eq!(check_closed_broadcast!(nodes[1], true).unwrap().data, "Peer attempted to reestablish channel with a very old local commitment transaction");
7393         check_added_monitors!(nodes[1], 1);
7394
7395         // Check A is able to claim to_remote output
7396         let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap().clone();
7397         assert_eq!(node_txn.len(), 1);
7398         check_spends!(node_txn[0], chan.3);
7399         assert_eq!(node_txn[0].output.len(), 2);
7400         mine_transaction(&nodes[0], &node_txn[0]);
7401         connect_blocks(&nodes[0], ANTI_REORG_DELAY - 1);
7402         check_closed_event!(nodes[0], 1, ClosureReason::ProcessingError { err: "We have fallen behind - we have received proof that if we broadcast remote is going to claim our funds - we can\'t do any automated broadcasting".to_string() });
7403         let spend_txn = check_spendable_outputs!(nodes[0], node_cfgs[0].keys_manager);
7404         assert_eq!(spend_txn.len(), 1);
7405         check_spends!(spend_txn[0], node_txn[0]);
7406 }
7407
7408 #[test]
7409 fn test_check_htlc_underpaying() {
7410         // Send payment through A -> B but A is maliciously
7411         // sending a probe payment (i.e less than expected value0
7412         // to B, B should refuse payment.
7413
7414         let chanmon_cfgs = create_chanmon_cfgs(2);
7415         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
7416         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
7417         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
7418
7419         // Create some initial channels
7420         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
7421
7422         let route = get_route(&nodes[0].node.get_our_node_id(), &nodes[0].net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 10_000, TEST_FINAL_CLTV, nodes[0].logger).unwrap();
7423         let (_, our_payment_hash, _) = get_payment_preimage_hash!(nodes[0]);
7424         let our_payment_secret = nodes[1].node.create_inbound_payment_for_hash(our_payment_hash, Some(100_000), 7200, 0).unwrap();
7425         nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
7426         check_added_monitors!(nodes[0], 1);
7427
7428         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
7429         assert_eq!(events.len(), 1);
7430         let mut payment_event = SendEvent::from_event(events.pop().unwrap());
7431         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
7432         commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
7433
7434         // Note that we first have to wait a random delay before processing the receipt of the HTLC,
7435         // and then will wait a second random delay before failing the HTLC back:
7436         expect_pending_htlcs_forwardable!(nodes[1]);
7437         expect_pending_htlcs_forwardable!(nodes[1]);
7438
7439         // Node 3 is expecting payment of 100_000 but received 10_000,
7440         // it should fail htlc like we didn't know the preimage.
7441         nodes[1].node.process_pending_htlc_forwards();
7442
7443         let events = nodes[1].node.get_and_clear_pending_msg_events();
7444         assert_eq!(events.len(), 1);
7445         let (update_fail_htlc, commitment_signed) = match events[0] {
7446                 MessageSendEvent::UpdateHTLCs { node_id: _ , updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, ref update_fee, ref commitment_signed } } => {
7447                         assert!(update_add_htlcs.is_empty());
7448                         assert!(update_fulfill_htlcs.is_empty());
7449                         assert_eq!(update_fail_htlcs.len(), 1);
7450                         assert!(update_fail_malformed_htlcs.is_empty());
7451                         assert!(update_fee.is_none());
7452                         (update_fail_htlcs[0].clone(), commitment_signed)
7453                 },
7454                 _ => panic!("Unexpected event"),
7455         };
7456         check_added_monitors!(nodes[1], 1);
7457
7458         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &update_fail_htlc);
7459         commitment_signed_dance!(nodes[0], nodes[1], commitment_signed, false, true);
7460
7461         // 10_000 msat as u64, followed by a height of CHAN_CONFIRM_DEPTH as u32
7462         let mut expected_failure_data = byte_utils::be64_to_array(10_000).to_vec();
7463         expected_failure_data.extend_from_slice(&byte_utils::be32_to_array(CHAN_CONFIRM_DEPTH));
7464         expect_payment_failed!(nodes[0], our_payment_hash, true, 0x4000|15, &expected_failure_data[..]);
7465 }
7466
7467 #[test]
7468 fn test_announce_disable_channels() {
7469         // Create 2 channels between A and B. Disconnect B. Call timer_tick_occurred and check for generated
7470         // ChannelUpdate. Reconnect B, reestablish and check there is non-generated ChannelUpdate.
7471
7472         let chanmon_cfgs = create_chanmon_cfgs(2);
7473         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
7474         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
7475         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
7476
7477         let short_id_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
7478         let short_id_2 = create_announced_chan_between_nodes(&nodes, 1, 0, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
7479         let short_id_3 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
7480
7481         // Disconnect peers
7482         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
7483         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
7484
7485         nodes[0].node.timer_tick_occurred(); // Enabled -> DisabledStaged
7486         nodes[0].node.timer_tick_occurred(); // DisabledStaged -> Disabled
7487         let msg_events = nodes[0].node.get_and_clear_pending_msg_events();
7488         assert_eq!(msg_events.len(), 3);
7489         let mut chans_disabled: HashSet<u64> = [short_id_1, short_id_2, short_id_3].iter().map(|a| *a).collect();
7490         for e in msg_events {
7491                 match e {
7492                         MessageSendEvent::BroadcastChannelUpdate { ref msg } => {
7493                                 assert_eq!(msg.contents.flags & (1<<1), 1<<1); // The "channel disabled" bit should be set
7494                                 // Check that each channel gets updated exactly once
7495                                 if !chans_disabled.remove(&msg.contents.short_channel_id) {
7496                                         panic!("Generated ChannelUpdate for wrong chan!");
7497                                 }
7498                         },
7499                         _ => panic!("Unexpected event"),
7500                 }
7501         }
7502         // Reconnect peers
7503         nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: InitFeatures::empty() });
7504         let reestablish_1 = get_chan_reestablish_msgs!(nodes[0], nodes[1]);
7505         assert_eq!(reestablish_1.len(), 3);
7506         nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: InitFeatures::empty() });
7507         let reestablish_2 = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
7508         assert_eq!(reestablish_2.len(), 3);
7509
7510         // Reestablish chan_1
7511         nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &reestablish_2[0]);
7512         handle_chan_reestablish_msgs!(nodes[0], nodes[1]);
7513         nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &reestablish_1[0]);
7514         handle_chan_reestablish_msgs!(nodes[1], nodes[0]);
7515         // Reestablish chan_2
7516         nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &reestablish_2[1]);
7517         handle_chan_reestablish_msgs!(nodes[0], nodes[1]);
7518         nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &reestablish_1[1]);
7519         handle_chan_reestablish_msgs!(nodes[1], nodes[0]);
7520         // Reestablish chan_3
7521         nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &reestablish_2[2]);
7522         handle_chan_reestablish_msgs!(nodes[0], nodes[1]);
7523         nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &reestablish_1[2]);
7524         handle_chan_reestablish_msgs!(nodes[1], nodes[0]);
7525
7526         nodes[0].node.timer_tick_occurred();
7527         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
7528         nodes[0].node.timer_tick_occurred();
7529         let msg_events = nodes[0].node.get_and_clear_pending_msg_events();
7530         assert_eq!(msg_events.len(), 3);
7531         chans_disabled = [short_id_1, short_id_2, short_id_3].iter().map(|a| *a).collect();
7532         for e in msg_events {
7533                 match e {
7534                         MessageSendEvent::BroadcastChannelUpdate { ref msg } => {
7535                                 assert_eq!(msg.contents.flags & (1<<1), 0); // The "channel disabled" bit should be off
7536                                 // Check that each channel gets updated exactly once
7537                                 if !chans_disabled.remove(&msg.contents.short_channel_id) {
7538                                         panic!("Generated ChannelUpdate for wrong chan!");
7539                                 }
7540                         },
7541                         _ => panic!("Unexpected event"),
7542                 }
7543         }
7544 }
7545
7546 #[test]
7547 fn test_priv_forwarding_rejection() {
7548         // If we have a private channel with outbound liquidity, and
7549         // UserConfig::accept_forwards_to_priv_channels is set to false, we should reject any attempts
7550         // to forward through that channel.
7551         let chanmon_cfgs = create_chanmon_cfgs(3);
7552         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
7553         let mut no_announce_cfg = test_default_channel_config();
7554         no_announce_cfg.channel_options.announced_channel = false;
7555         no_announce_cfg.accept_forwards_to_priv_channels = false;
7556         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, Some(no_announce_cfg), None]);
7557         let persister: test_utils::TestPersister;
7558         let new_chain_monitor: test_utils::TestChainMonitor;
7559         let nodes_1_deserialized: ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
7560         let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs);
7561
7562         create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1_000_000, 500_000_000, InitFeatures::known(), InitFeatures::known());
7563
7564         // Note that the create_*_chan functions in utils requires announcement_signatures, which we do
7565         // not send for private channels.
7566         nodes[1].node.create_channel(nodes[2].node.get_our_node_id(), 1_000_000, 500_000_000, 42, None).unwrap();
7567         let open_channel = get_event_msg!(nodes[1], MessageSendEvent::SendOpenChannel, nodes[2].node.get_our_node_id());
7568         nodes[2].node.handle_open_channel(&nodes[1].node.get_our_node_id(), InitFeatures::known(), &open_channel);
7569         let accept_channel = get_event_msg!(nodes[2], MessageSendEvent::SendAcceptChannel, nodes[1].node.get_our_node_id());
7570         nodes[1].node.handle_accept_channel(&nodes[2].node.get_our_node_id(), InitFeatures::known(), &accept_channel);
7571
7572         let (temporary_channel_id, tx, _) = create_funding_transaction(&nodes[1], 1_000_000, 42);
7573         nodes[1].node.funding_transaction_generated(&temporary_channel_id, tx.clone()).unwrap();
7574         nodes[2].node.handle_funding_created(&nodes[1].node.get_our_node_id(), &get_event_msg!(nodes[1], MessageSendEvent::SendFundingCreated, nodes[2].node.get_our_node_id()));
7575         check_added_monitors!(nodes[2], 1);
7576
7577         nodes[1].node.handle_funding_signed(&nodes[2].node.get_our_node_id(), &get_event_msg!(nodes[2], MessageSendEvent::SendFundingSigned, nodes[1].node.get_our_node_id()));
7578         check_added_monitors!(nodes[1], 1);
7579
7580         let conf_height = core::cmp::max(nodes[1].best_block_info().1 + 1, nodes[2].best_block_info().1 + 1);
7581         confirm_transaction_at(&nodes[1], &tx, conf_height);
7582         connect_blocks(&nodes[1], CHAN_CONFIRM_DEPTH - 1);
7583         confirm_transaction_at(&nodes[2], &tx, conf_height);
7584         connect_blocks(&nodes[2], CHAN_CONFIRM_DEPTH - 1);
7585         let as_funding_locked = get_event_msg!(nodes[1], MessageSendEvent::SendFundingLocked, nodes[2].node.get_our_node_id());
7586         nodes[1].node.handle_funding_locked(&nodes[2].node.get_our_node_id(), &get_event_msg!(nodes[2], MessageSendEvent::SendFundingLocked, nodes[1].node.get_our_node_id()));
7587         get_event_msg!(nodes[1], MessageSendEvent::SendChannelUpdate, nodes[2].node.get_our_node_id());
7588         nodes[2].node.handle_funding_locked(&nodes[1].node.get_our_node_id(), &as_funding_locked);
7589         get_event_msg!(nodes[2], MessageSendEvent::SendChannelUpdate, nodes[1].node.get_our_node_id());
7590
7591         assert!(nodes[0].node.list_usable_channels()[0].is_public);
7592         assert_eq!(nodes[1].node.list_usable_channels().len(), 2);
7593         assert!(!nodes[2].node.list_usable_channels()[0].is_public);
7594
7595         // We should always be able to forward through nodes[1] as long as its out through a public
7596         // channel:
7597         send_payment(&nodes[2], &[&nodes[1], &nodes[0]], 10_000);
7598
7599         // ... however, if we send to nodes[2], we will have to pass the private channel from nodes[1]
7600         // to nodes[2], which should be rejected:
7601         let (our_payment_preimage, our_payment_hash, our_payment_secret) = get_payment_preimage_hash!(nodes[2]);
7602         let route = get_route(&nodes[0].node.get_our_node_id(),
7603                 &nodes[0].net_graph_msg_handler.network_graph,
7604                 &nodes[2].node.get_our_node_id(), Some(InvoiceFeatures::known()), None,
7605                 &[&RouteHint(vec![RouteHintHop {
7606                         src_node_id: nodes[1].node.get_our_node_id(),
7607                         short_channel_id: nodes[2].node.list_channels()[0].short_channel_id.unwrap(),
7608                         fees: RoutingFees { base_msat: 1000, proportional_millionths: 0 },
7609                         cltv_expiry_delta: MIN_CLTV_EXPIRY_DELTA,
7610                         htlc_minimum_msat: None,
7611                         htlc_maximum_msat: None,
7612                 }])], 10_000, TEST_FINAL_CLTV, nodes[0].logger).unwrap();
7613
7614         nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
7615         check_added_monitors!(nodes[0], 1);
7616         let payment_event = SendEvent::from_event(nodes[0].node.get_and_clear_pending_msg_events().remove(0));
7617         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
7618         commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false, true);
7619
7620         let htlc_fail_updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
7621         assert!(htlc_fail_updates.update_add_htlcs.is_empty());
7622         assert_eq!(htlc_fail_updates.update_fail_htlcs.len(), 1);
7623         assert!(htlc_fail_updates.update_fail_malformed_htlcs.is_empty());
7624         assert!(htlc_fail_updates.update_fee.is_none());
7625
7626         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &htlc_fail_updates.update_fail_htlcs[0]);
7627         commitment_signed_dance!(nodes[0], nodes[1], htlc_fail_updates.commitment_signed, true, true);
7628         expect_payment_failed_with_update!(nodes[0], our_payment_hash, false, nodes[2].node.list_channels()[0].short_channel_id.unwrap(), true);
7629
7630         // Now disconnect nodes[1] from its peers and restart with accept_forwards_to_priv_channels set
7631         // to true. Sadly there is currently no way to change it at runtime.
7632
7633         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
7634         nodes[2].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
7635
7636         let nodes_1_serialized = nodes[1].node.encode();
7637         let mut monitor_a_serialized = test_utils::TestVecWriter(Vec::new());
7638         let mut monitor_b_serialized = test_utils::TestVecWriter(Vec::new());
7639         {
7640                 let mons = nodes[1].chain_monitor.chain_monitor.monitors.read().unwrap();
7641                 let mut mon_iter = mons.iter();
7642                 mon_iter.next().unwrap().1.write(&mut monitor_a_serialized).unwrap();
7643                 mon_iter.next().unwrap().1.write(&mut monitor_b_serialized).unwrap();
7644         }
7645
7646         persister = test_utils::TestPersister::new();
7647         let keys_manager = &chanmon_cfgs[1].keys_manager;
7648         new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[1].chain_source), nodes[1].tx_broadcaster.clone(), nodes[1].logger, node_cfgs[1].fee_estimator, &persister, keys_manager);
7649         nodes[1].chain_monitor = &new_chain_monitor;
7650
7651         let mut monitor_a_read = &monitor_a_serialized.0[..];
7652         let mut monitor_b_read = &monitor_b_serialized.0[..];
7653         let (_, mut monitor_a) = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(&mut monitor_a_read, keys_manager).unwrap();
7654         let (_, mut monitor_b) = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(&mut monitor_b_read, keys_manager).unwrap();
7655         assert!(monitor_a_read.is_empty());
7656         assert!(monitor_b_read.is_empty());
7657
7658         no_announce_cfg.accept_forwards_to_priv_channels = true;
7659
7660         let mut nodes_1_read = &nodes_1_serialized[..];
7661         let (_, nodes_1_deserialized_tmp) = {
7662                 let mut channel_monitors = HashMap::new();
7663                 channel_monitors.insert(monitor_a.get_funding_txo().0, &mut monitor_a);
7664                 channel_monitors.insert(monitor_b.get_funding_txo().0, &mut monitor_b);
7665                 <(BlockHash, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_1_read, ChannelManagerReadArgs {
7666                         default_config: no_announce_cfg,
7667                         keys_manager,
7668                         fee_estimator: node_cfgs[1].fee_estimator,
7669                         chain_monitor: nodes[1].chain_monitor,
7670                         tx_broadcaster: nodes[1].tx_broadcaster.clone(),
7671                         logger: nodes[1].logger,
7672                         channel_monitors,
7673                 }).unwrap()
7674         };
7675         assert!(nodes_1_read.is_empty());
7676         nodes_1_deserialized = nodes_1_deserialized_tmp;
7677
7678         assert!(nodes[1].chain_monitor.watch_channel(monitor_a.get_funding_txo().0, monitor_a).is_ok());
7679         assert!(nodes[1].chain_monitor.watch_channel(monitor_b.get_funding_txo().0, monitor_b).is_ok());
7680         check_added_monitors!(nodes[1], 2);
7681         nodes[1].node = &nodes_1_deserialized;
7682
7683         nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: InitFeatures::known() });
7684         nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: InitFeatures::empty() });
7685         let as_reestablish = get_event_msg!(nodes[0], MessageSendEvent::SendChannelReestablish, nodes[1].node.get_our_node_id());
7686         let bs_reestablish = get_event_msg!(nodes[1], MessageSendEvent::SendChannelReestablish, nodes[0].node.get_our_node_id());
7687         nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &as_reestablish);
7688         nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &bs_reestablish);
7689         get_event_msg!(nodes[0], MessageSendEvent::SendChannelUpdate, nodes[1].node.get_our_node_id());
7690         get_event_msg!(nodes[1], MessageSendEvent::SendChannelUpdate, nodes[0].node.get_our_node_id());
7691
7692         nodes[1].node.peer_connected(&nodes[2].node.get_our_node_id(), &msgs::Init { features: InitFeatures::known() });
7693         nodes[2].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: InitFeatures::empty() });
7694         let bs_reestablish = get_event_msg!(nodes[1], MessageSendEvent::SendChannelReestablish, nodes[2].node.get_our_node_id());
7695         let cs_reestablish = get_event_msg!(nodes[2], MessageSendEvent::SendChannelReestablish, nodes[1].node.get_our_node_id());
7696         nodes[2].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &bs_reestablish);
7697         nodes[1].node.handle_channel_reestablish(&nodes[2].node.get_our_node_id(), &cs_reestablish);
7698         get_event_msg!(nodes[1], MessageSendEvent::SendChannelUpdate, nodes[2].node.get_our_node_id());
7699         get_event_msg!(nodes[2], MessageSendEvent::SendChannelUpdate, nodes[1].node.get_our_node_id());
7700
7701         nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret)).unwrap();
7702         check_added_monitors!(nodes[0], 1);
7703         pass_along_route(&nodes[0], &[&[&nodes[1], &nodes[2]]], 10_000, our_payment_hash, our_payment_secret);
7704         claim_payment(&nodes[0], &[&nodes[1], &nodes[2]], our_payment_preimage);
7705 }
7706
7707 #[test]
7708 fn test_bump_penalty_txn_on_revoked_commitment() {
7709         // In case of penalty txn with too low feerates for getting into mempools, RBF-bump them to be sure
7710         // we're able to claim outputs on revoked commitment transaction before timelocks expiration
7711
7712         let chanmon_cfgs = create_chanmon_cfgs(2);
7713         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
7714         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
7715         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
7716
7717         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1000000, 59000000, InitFeatures::known(), InitFeatures::known());
7718         let logger = test_utils::TestLogger::new();
7719
7720         let payment_preimage = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
7721         let net_graph_msg_handler = &nodes[1].net_graph_msg_handler;
7722         let route = get_route(&nodes[1].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[0].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 3000000, 30, &logger).unwrap();
7723         send_along_route(&nodes[1], route, &vec!(&nodes[0])[..], 3000000);
7724
7725         let revoked_txn = get_local_commitment_txn!(nodes[0], chan.2);
7726         // Revoked commitment txn with 4 outputs : to_local, to_remote, 1 outgoing HTLC, 1 incoming HTLC
7727         assert_eq!(revoked_txn[0].output.len(), 4);
7728         assert_eq!(revoked_txn[0].input.len(), 1);
7729         assert_eq!(revoked_txn[0].input[0].previous_output.txid, chan.3.txid());
7730         let revoked_txid = revoked_txn[0].txid();
7731
7732         let mut penalty_sum = 0;
7733         for outp in revoked_txn[0].output.iter() {
7734                 if outp.script_pubkey.is_v0_p2wsh() {
7735                         penalty_sum += outp.value;
7736                 }
7737         }
7738
7739         // Connect blocks to change height_timer range to see if we use right soonest_timelock
7740         let header_114 = connect_blocks(&nodes[1], 14);
7741
7742         // Actually revoke tx by claiming a HTLC
7743         claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage);
7744         let header = BlockHeader { version: 0x20000000, prev_blockhash: header_114, merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
7745         connect_block(&nodes[1], &Block { header, txdata: vec![revoked_txn[0].clone()] });
7746         check_added_monitors!(nodes[1], 1);
7747
7748         // One or more justice tx should have been broadcast, check it
7749         let penalty_1;
7750         let feerate_1;
7751         {
7752                 let mut node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
7753                 assert_eq!(node_txn.len(), 2); // justice tx (broadcasted from ChannelMonitor) + local commitment tx
7754                 assert_eq!(node_txn[0].input.len(), 3); // Penalty txn claims to_local, offered_htlc and received_htlc outputs
7755                 assert_eq!(node_txn[0].output.len(), 1);
7756                 check_spends!(node_txn[0], revoked_txn[0]);
7757                 let fee_1 = penalty_sum - node_txn[0].output[0].value;
7758                 feerate_1 = fee_1 * 1000 / node_txn[0].get_weight() as u64;
7759                 penalty_1 = node_txn[0].txid();
7760                 node_txn.clear();
7761         };
7762
7763         // After exhaustion of height timer, a new bumped justice tx should have been broadcast, check it
7764         connect_blocks(&nodes[1], 15);
7765         let mut penalty_2 = penalty_1;
7766         let mut feerate_2 = 0;
7767         {
7768                 let mut node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
7769                 assert_eq!(node_txn.len(), 1);
7770                 if node_txn[0].input[0].previous_output.txid == revoked_txid {
7771                         assert_eq!(node_txn[0].input.len(), 3); // Penalty txn claims to_local, offered_htlc and received_htlc outputs
7772                         assert_eq!(node_txn[0].output.len(), 1);
7773                         check_spends!(node_txn[0], revoked_txn[0]);
7774                         penalty_2 = node_txn[0].txid();
7775                         // Verify new bumped tx is different from last claiming transaction, we don't want spurrious rebroadcast
7776                         assert_ne!(penalty_2, penalty_1);
7777                         let fee_2 = penalty_sum - node_txn[0].output[0].value;
7778                         feerate_2 = fee_2 * 1000 / node_txn[0].get_weight() as u64;
7779                         // Verify 25% bump heuristic
7780                         assert!(feerate_2 * 100 >= feerate_1 * 125);
7781                         node_txn.clear();
7782                 }
7783         }
7784         assert_ne!(feerate_2, 0);
7785
7786         // After exhaustion of height timer for a 2nd time, a new bumped justice tx should have been broadcast, check it
7787         connect_blocks(&nodes[1], 1);
7788         let penalty_3;
7789         let mut feerate_3 = 0;
7790         {
7791                 let mut node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
7792                 assert_eq!(node_txn.len(), 1);
7793                 if node_txn[0].input[0].previous_output.txid == revoked_txid {
7794                         assert_eq!(node_txn[0].input.len(), 3); // Penalty txn claims to_local, offered_htlc and received_htlc outputs
7795                         assert_eq!(node_txn[0].output.len(), 1);
7796                         check_spends!(node_txn[0], revoked_txn[0]);
7797                         penalty_3 = node_txn[0].txid();
7798                         // Verify new bumped tx is different from last claiming transaction, we don't want spurrious rebroadcast
7799                         assert_ne!(penalty_3, penalty_2);
7800                         let fee_3 = penalty_sum - node_txn[0].output[0].value;
7801                         feerate_3 = fee_3 * 1000 / node_txn[0].get_weight() as u64;
7802                         // Verify 25% bump heuristic
7803                         assert!(feerate_3 * 100 >= feerate_2 * 125);
7804                         node_txn.clear();
7805                 }
7806         }
7807         assert_ne!(feerate_3, 0);
7808
7809         nodes[1].node.get_and_clear_pending_events();
7810         nodes[1].node.get_and_clear_pending_msg_events();
7811 }
7812
7813 #[test]
7814 fn test_bump_penalty_txn_on_revoked_htlcs() {
7815         // In case of penalty txn with too low feerates for getting into mempools, RBF-bump them to sure
7816         // we're able to claim outputs on revoked HTLC transactions before timelocks expiration
7817
7818         let mut chanmon_cfgs = create_chanmon_cfgs(2);
7819         chanmon_cfgs[1].keys_manager.disable_revocation_policy_check = true;
7820         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
7821         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
7822         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
7823
7824         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1000000, 59000000, InitFeatures::known(), InitFeatures::known());
7825         // Lock HTLC in both directions (using a slightly lower CLTV delay to provide timely RBF bumps)
7826         let route = get_route(&nodes[0].node.get_our_node_id(), &nodes[0].net_graph_msg_handler.network_graph,
7827                 &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 3_000_000, 50, nodes[0].logger).unwrap();
7828         let payment_preimage = send_along_route(&nodes[0], route, &[&nodes[1]], 3_000_000).0;
7829         let route = get_route(&nodes[1].node.get_our_node_id(), &nodes[1].net_graph_msg_handler.network_graph,
7830                 &nodes[0].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 3_000_000, 50, nodes[0].logger).unwrap();
7831         send_along_route(&nodes[1], route, &[&nodes[0]], 3_000_000);
7832
7833         let revoked_local_txn = get_local_commitment_txn!(nodes[1], chan.2);
7834         assert_eq!(revoked_local_txn[0].input.len(), 1);
7835         assert_eq!(revoked_local_txn[0].input[0].previous_output.txid, chan.3.txid());
7836
7837         // Revoke local commitment tx
7838         claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage);
7839
7840         let header = BlockHeader { version: 0x20000000, prev_blockhash: nodes[1].best_block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
7841         // B will generate both revoked HTLC-timeout/HTLC-preimage txn from revoked commitment tx
7842         connect_block(&nodes[1], &Block { header, txdata: vec![revoked_local_txn[0].clone()] });
7843         check_closed_broadcast!(nodes[1], true);
7844         check_added_monitors!(nodes[1], 1);
7845         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
7846         connect_blocks(&nodes[1], 49); // Confirm blocks until the HTLC expires (note CLTV was explicitly 50 above)
7847
7848         let revoked_htlc_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
7849         assert_eq!(revoked_htlc_txn.len(), 3);
7850         check_spends!(revoked_htlc_txn[1], chan.3);
7851
7852         assert_eq!(revoked_htlc_txn[0].input[0].witness.last().unwrap().len(), ACCEPTED_HTLC_SCRIPT_WEIGHT);
7853         assert_eq!(revoked_htlc_txn[0].input.len(), 1);
7854         check_spends!(revoked_htlc_txn[0], revoked_local_txn[0]);
7855
7856         assert_eq!(revoked_htlc_txn[2].input.len(), 1);
7857         assert_eq!(revoked_htlc_txn[2].input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
7858         assert_eq!(revoked_htlc_txn[2].output.len(), 1);
7859         check_spends!(revoked_htlc_txn[2], revoked_local_txn[0]);
7860
7861         // Broadcast set of revoked txn on A
7862         let hash_128 = connect_blocks(&nodes[0], 40);
7863         let header_11 = BlockHeader { version: 0x20000000, prev_blockhash: hash_128, merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
7864         connect_block(&nodes[0], &Block { header: header_11, txdata: vec![revoked_local_txn[0].clone()] });
7865         let header_129 = BlockHeader { version: 0x20000000, prev_blockhash: header_11.block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
7866         connect_block(&nodes[0], &Block { header: header_129, txdata: vec![revoked_htlc_txn[0].clone(), revoked_htlc_txn[2].clone()] });
7867         let events = nodes[0].node.get_and_clear_pending_events();
7868         expect_pending_htlcs_forwardable_from_events!(nodes[0], events[0..1], true);
7869         match events[1] {
7870                 Event::ChannelClosed { reason: ClosureReason::CommitmentTxConfirmed, .. } => {}
7871                 _ => panic!("Unexpected event"),
7872         }
7873         let first;
7874         let feerate_1;
7875         let penalty_txn;
7876         {
7877                 let mut node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
7878                 assert_eq!(node_txn.len(), 5); // 3 penalty txn on revoked commitment tx + A commitment tx + 1 penalty tnx on revoked HTLC txn
7879                 // Verify claim tx are spending revoked HTLC txn
7880
7881                 // node_txn 0-2 each spend a separate revoked output from revoked_local_txn[0]
7882                 // Note that node_txn[0] and node_txn[1] are bogus - they double spend the revoked_htlc_txn
7883                 // which are included in the same block (they are broadcasted because we scan the
7884                 // transactions linearly and generate claims as we go, they likely should be removed in the
7885                 // future).
7886                 assert_eq!(node_txn[0].input.len(), 1);
7887                 check_spends!(node_txn[0], revoked_local_txn[0]);
7888                 assert_eq!(node_txn[1].input.len(), 1);
7889                 check_spends!(node_txn[1], revoked_local_txn[0]);
7890                 assert_eq!(node_txn[2].input.len(), 1);
7891                 check_spends!(node_txn[2], revoked_local_txn[0]);
7892
7893                 // Each of the three justice transactions claim a separate (single) output of the three
7894                 // available, which we check here:
7895                 assert_ne!(node_txn[0].input[0].previous_output, node_txn[1].input[0].previous_output);
7896                 assert_ne!(node_txn[0].input[0].previous_output, node_txn[2].input[0].previous_output);
7897                 assert_ne!(node_txn[1].input[0].previous_output, node_txn[2].input[0].previous_output);
7898
7899                 assert_eq!(node_txn[0].input[0].previous_output, revoked_htlc_txn[0].input[0].previous_output);
7900                 assert_eq!(node_txn[1].input[0].previous_output, revoked_htlc_txn[2].input[0].previous_output);
7901
7902                 // node_txn[3] is the local commitment tx broadcast just because (and somewhat in case of
7903                 // reorgs, though its not clear its ever worth broadcasting conflicting txn like this when
7904                 // a remote commitment tx has already been confirmed).
7905                 check_spends!(node_txn[3], chan.3);
7906
7907                 // node_txn[4] spends the revoked outputs from the revoked_htlc_txn (which only have one
7908                 // output, checked above).
7909                 assert_eq!(node_txn[4].input.len(), 2);
7910                 assert_eq!(node_txn[4].output.len(), 1);
7911                 check_spends!(node_txn[4], revoked_htlc_txn[0], revoked_htlc_txn[2]);
7912
7913                 first = node_txn[4].txid();
7914                 // Store both feerates for later comparison
7915                 let fee_1 = revoked_htlc_txn[0].output[0].value + revoked_htlc_txn[2].output[0].value - node_txn[4].output[0].value;
7916                 feerate_1 = fee_1 * 1000 / node_txn[4].get_weight() as u64;
7917                 penalty_txn = vec![node_txn[2].clone()];
7918                 node_txn.clear();
7919         }
7920
7921         // Connect one more block to see if bumped penalty are issued for HTLC txn
7922         let header_130 = BlockHeader { version: 0x20000000, prev_blockhash: header_129.block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
7923         connect_block(&nodes[0], &Block { header: header_130, txdata: penalty_txn });
7924         let header_131 = BlockHeader { version: 0x20000000, prev_blockhash: header_130.block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
7925         connect_block(&nodes[0], &Block { header: header_131, txdata: Vec::new() });
7926         {
7927                 let mut node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
7928                 assert_eq!(node_txn.len(), 2); // 2 bumped penalty txn on revoked commitment tx
7929
7930                 check_spends!(node_txn[0], revoked_local_txn[0]);
7931                 check_spends!(node_txn[1], revoked_local_txn[0]);
7932                 // Note that these are both bogus - they spend outputs already claimed in block 129:
7933                 if node_txn[0].input[0].previous_output == revoked_htlc_txn[0].input[0].previous_output  {
7934                         assert_eq!(node_txn[1].input[0].previous_output, revoked_htlc_txn[2].input[0].previous_output);
7935                 } else {
7936                         assert_eq!(node_txn[0].input[0].previous_output, revoked_htlc_txn[2].input[0].previous_output);
7937                         assert_eq!(node_txn[1].input[0].previous_output, revoked_htlc_txn[0].input[0].previous_output);
7938                 }
7939
7940                 node_txn.clear();
7941         };
7942
7943         // Few more blocks to confirm penalty txn
7944         connect_blocks(&nodes[0], 4);
7945         assert!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().is_empty());
7946         let header_144 = connect_blocks(&nodes[0], 9);
7947         let node_txn = {
7948                 let mut node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
7949                 assert_eq!(node_txn.len(), 1);
7950
7951                 assert_eq!(node_txn[0].input.len(), 2);
7952                 check_spends!(node_txn[0], revoked_htlc_txn[0], revoked_htlc_txn[2]);
7953                 // Verify bumped tx is different and 25% bump heuristic
7954                 assert_ne!(first, node_txn[0].txid());
7955                 let fee_2 = revoked_htlc_txn[0].output[0].value + revoked_htlc_txn[2].output[0].value - node_txn[0].output[0].value;
7956                 let feerate_2 = fee_2 * 1000 / node_txn[0].get_weight() as u64;
7957                 assert!(feerate_2 * 100 > feerate_1 * 125);
7958                 let txn = vec![node_txn[0].clone()];
7959                 node_txn.clear();
7960                 txn
7961         };
7962         // Broadcast claim txn and confirm blocks to avoid further bumps on this outputs
7963         let header_145 = BlockHeader { version: 0x20000000, prev_blockhash: header_144, merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
7964         connect_block(&nodes[0], &Block { header: header_145, txdata: node_txn });
7965         connect_blocks(&nodes[0], 20);
7966         {
7967                 let mut node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
7968                 // We verify than no new transaction has been broadcast because previously
7969                 // we were buggy on this exact behavior by not tracking for monitoring remote HTLC outputs (see #411)
7970                 // which means we wouldn't see a spend of them by a justice tx and bumped justice tx
7971                 // were generated forever instead of safe cleaning after confirmation and ANTI_REORG_SAFE_DELAY blocks.
7972                 // Enforce spending of revoked htlc output by claiming transaction remove request as expected and dry
7973                 // up bumped justice generation.
7974                 assert_eq!(node_txn.len(), 0);
7975                 node_txn.clear();
7976         }
7977         check_closed_broadcast!(nodes[0], true);
7978         check_added_monitors!(nodes[0], 1);
7979 }
7980
7981 #[test]
7982 fn test_bump_penalty_txn_on_remote_commitment() {
7983         // In case of claim txn with too low feerates for getting into mempools, RBF-bump them to be sure
7984         // we're able to claim outputs on remote commitment transaction before timelocks expiration
7985
7986         // Create 2 HTLCs
7987         // Provide preimage for one
7988         // Check aggregation
7989
7990         let chanmon_cfgs = create_chanmon_cfgs(2);
7991         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
7992         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
7993         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
7994
7995         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1000000, 59000000, InitFeatures::known(), InitFeatures::known());
7996         let payment_preimage = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
7997         route_payment(&nodes[1], &vec!(&nodes[0])[..], 3000000).0;
7998
7999         // Remote commitment txn with 4 outputs : to_local, to_remote, 1 outgoing HTLC, 1 incoming HTLC
8000         let remote_txn = get_local_commitment_txn!(nodes[0], chan.2);
8001         assert_eq!(remote_txn[0].output.len(), 4);
8002         assert_eq!(remote_txn[0].input.len(), 1);
8003         assert_eq!(remote_txn[0].input[0].previous_output.txid, chan.3.txid());
8004
8005         // Claim a HTLC without revocation (provide B monitor with preimage)
8006         nodes[1].node.claim_funds(payment_preimage);
8007         mine_transaction(&nodes[1], &remote_txn[0]);
8008         check_added_monitors!(nodes[1], 2);
8009         connect_blocks(&nodes[1], TEST_FINAL_CLTV - 1); // Confirm blocks until the HTLC expires
8010
8011         // One or more claim tx should have been broadcast, check it
8012         let timeout;
8013         let preimage;
8014         let preimage_bump;
8015         let feerate_timeout;
8016         let feerate_preimage;
8017         {
8018                 let mut node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
8019                 // 9 transactions including:
8020                 // 1*2 ChannelManager local broadcasts of commitment + HTLC-Success
8021                 // 1*3 ChannelManager local broadcasts of commitment + HTLC-Success + HTLC-Timeout
8022                 // 2 * HTLC-Success (one RBF bump we'll check later)
8023                 // 1 * HTLC-Timeout
8024                 assert_eq!(node_txn.len(), 8);
8025                 assert_eq!(node_txn[0].input.len(), 1);
8026                 assert_eq!(node_txn[6].input.len(), 1);
8027                 check_spends!(node_txn[0], remote_txn[0]);
8028                 check_spends!(node_txn[6], remote_txn[0]);
8029                 assert_eq!(node_txn[0].input[0].previous_output, node_txn[3].input[0].previous_output);
8030                 preimage_bump = node_txn[3].clone();
8031
8032                 check_spends!(node_txn[1], chan.3);
8033                 check_spends!(node_txn[2], node_txn[1]);
8034                 assert_eq!(node_txn[1], node_txn[4]);
8035                 assert_eq!(node_txn[2], node_txn[5]);
8036
8037                 timeout = node_txn[6].txid();
8038                 let index = node_txn[6].input[0].previous_output.vout;
8039                 let fee = remote_txn[0].output[index as usize].value - node_txn[6].output[0].value;
8040                 feerate_timeout = fee * 1000 / node_txn[6].get_weight() as u64;
8041
8042                 preimage = node_txn[0].txid();
8043                 let index = node_txn[0].input[0].previous_output.vout;
8044                 let fee = remote_txn[0].output[index as usize].value - node_txn[0].output[0].value;
8045                 feerate_preimage = fee * 1000 / node_txn[0].get_weight() as u64;
8046
8047                 node_txn.clear();
8048         };
8049         assert_ne!(feerate_timeout, 0);
8050         assert_ne!(feerate_preimage, 0);
8051
8052         // After exhaustion of height timer, new bumped claim txn should have been broadcast, check it
8053         connect_blocks(&nodes[1], 15);
8054         {
8055                 let mut node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
8056                 assert_eq!(node_txn.len(), 1);
8057                 assert_eq!(node_txn[0].input.len(), 1);
8058                 assert_eq!(preimage_bump.input.len(), 1);
8059                 check_spends!(node_txn[0], remote_txn[0]);
8060                 check_spends!(preimage_bump, remote_txn[0]);
8061
8062                 let index = preimage_bump.input[0].previous_output.vout;
8063                 let fee = remote_txn[0].output[index as usize].value - preimage_bump.output[0].value;
8064                 let new_feerate = fee * 1000 / preimage_bump.get_weight() as u64;
8065                 assert!(new_feerate * 100 > feerate_timeout * 125);
8066                 assert_ne!(timeout, preimage_bump.txid());
8067
8068                 let index = node_txn[0].input[0].previous_output.vout;
8069                 let fee = remote_txn[0].output[index as usize].value - node_txn[0].output[0].value;
8070                 let new_feerate = fee * 1000 / node_txn[0].get_weight() as u64;
8071                 assert!(new_feerate * 100 > feerate_preimage * 125);
8072                 assert_ne!(preimage, node_txn[0].txid());
8073
8074                 node_txn.clear();
8075         }
8076
8077         nodes[1].node.get_and_clear_pending_events();
8078         nodes[1].node.get_and_clear_pending_msg_events();
8079 }
8080
8081 #[test]
8082 fn test_counterparty_raa_skip_no_crash() {
8083         // Previously, if our counterparty sent two RAAs in a row without us having provided a
8084         // commitment transaction, we would have happily carried on and provided them the next
8085         // commitment transaction based on one RAA forward. This would probably eventually have led to
8086         // channel closure, but it would not have resulted in funds loss. Still, our
8087         // EnforcingSigner would have panicked as it doesn't like jumps into the future. Here, we
8088         // check simply that the channel is closed in response to such an RAA, but don't check whether
8089         // we decide to punish our counterparty for revoking their funds (as we don't currently
8090         // implement that).
8091         let chanmon_cfgs = create_chanmon_cfgs(2);
8092         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
8093         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
8094         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
8095         let channel_id = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known()).2;
8096
8097         let mut guard = nodes[0].node.channel_state.lock().unwrap();
8098         let keys = guard.by_id.get_mut(&channel_id).unwrap().get_signer();
8099
8100         const INITIAL_COMMITMENT_NUMBER: u64 = (1 << 48) - 1;
8101
8102         // Make signer believe we got a counterparty signature, so that it allows the revocation
8103         keys.get_enforcement_state().last_holder_commitment -= 1;
8104         let per_commitment_secret = keys.release_commitment_secret(INITIAL_COMMITMENT_NUMBER);
8105
8106         // Must revoke without gaps
8107         keys.get_enforcement_state().last_holder_commitment -= 1;
8108         keys.release_commitment_secret(INITIAL_COMMITMENT_NUMBER - 1);
8109
8110         keys.get_enforcement_state().last_holder_commitment -= 1;
8111         let next_per_commitment_point = PublicKey::from_secret_key(&Secp256k1::new(),
8112                 &SecretKey::from_slice(&keys.release_commitment_secret(INITIAL_COMMITMENT_NUMBER - 2)).unwrap());
8113
8114         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(),
8115                 &msgs::RevokeAndACK { channel_id, per_commitment_secret, next_per_commitment_point });
8116         assert_eq!(check_closed_broadcast!(nodes[1], true).unwrap().data, "Received an unexpected revoke_and_ack");
8117         check_added_monitors!(nodes[1], 1);
8118         check_closed_event!(nodes[1], 1, ClosureReason::ProcessingError { err: "Received an unexpected revoke_and_ack".to_string() });
8119 }
8120
8121 #[test]
8122 fn test_bump_txn_sanitize_tracking_maps() {
8123         // Sanitizing pendning_claim_request and claimable_outpoints used to be buggy,
8124         // verify we clean then right after expiration of ANTI_REORG_DELAY.
8125
8126         let chanmon_cfgs = create_chanmon_cfgs(2);
8127         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
8128         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
8129         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
8130
8131         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1000000, 59000000, InitFeatures::known(), InitFeatures::known());
8132         // Lock HTLC in both directions
8133         let payment_preimage = route_payment(&nodes[0], &vec!(&nodes[1])[..], 9_000_000).0;
8134         route_payment(&nodes[1], &vec!(&nodes[0])[..], 9_000_000).0;
8135
8136         let revoked_local_txn = get_local_commitment_txn!(nodes[1], chan.2);
8137         assert_eq!(revoked_local_txn[0].input.len(), 1);
8138         assert_eq!(revoked_local_txn[0].input[0].previous_output.txid, chan.3.txid());
8139
8140         // Revoke local commitment tx
8141         claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage);
8142
8143         // Broadcast set of revoked txn on A
8144         connect_blocks(&nodes[0], TEST_FINAL_CLTV + 2 - CHAN_CONFIRM_DEPTH);
8145         expect_pending_htlcs_forwardable_ignore!(nodes[0]);
8146         assert_eq!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().len(), 0);
8147
8148         mine_transaction(&nodes[0], &revoked_local_txn[0]);
8149         check_closed_broadcast!(nodes[0], true);
8150         check_added_monitors!(nodes[0], 1);
8151         check_closed_event!(nodes[0], 1, ClosureReason::CommitmentTxConfirmed);
8152         let penalty_txn = {
8153                 let mut node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
8154                 assert_eq!(node_txn.len(), 4); //ChannelMonitor: justice txn * 3, ChannelManager: local commitment tx
8155                 check_spends!(node_txn[0], revoked_local_txn[0]);
8156                 check_spends!(node_txn[1], revoked_local_txn[0]);
8157                 check_spends!(node_txn[2], revoked_local_txn[0]);
8158                 let penalty_txn = vec![node_txn[0].clone(), node_txn[1].clone(), node_txn[2].clone()];
8159                 node_txn.clear();
8160                 penalty_txn
8161         };
8162         let header_130 = BlockHeader { version: 0x20000000, prev_blockhash: nodes[0].best_block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
8163         connect_block(&nodes[0], &Block { header: header_130, txdata: penalty_txn });
8164         connect_blocks(&nodes[0], ANTI_REORG_DELAY - 1);
8165         {
8166                 let monitors = nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap();
8167                 if let Some(monitor) = monitors.get(&OutPoint { txid: chan.3.txid(), index: 0 }) {
8168                         assert!(monitor.inner.lock().unwrap().onchain_tx_handler.pending_claim_requests.is_empty());
8169                         assert!(monitor.inner.lock().unwrap().onchain_tx_handler.claimable_outpoints.is_empty());
8170                 }
8171         }
8172 }
8173
8174 #[test]
8175 fn test_override_channel_config() {
8176         let chanmon_cfgs = create_chanmon_cfgs(2);
8177         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
8178         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
8179         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
8180
8181         // Node0 initiates a channel to node1 using the override config.
8182         let mut override_config = UserConfig::default();
8183         override_config.own_channel_config.our_to_self_delay = 200;
8184
8185         nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), 16_000_000, 12_000_000, 42, Some(override_config)).unwrap();
8186
8187         // Assert the channel created by node0 is using the override config.
8188         let res = get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id());
8189         assert_eq!(res.channel_flags, 0);
8190         assert_eq!(res.to_self_delay, 200);
8191 }
8192
8193 #[test]
8194 fn test_override_0msat_htlc_minimum() {
8195         let mut zero_config = UserConfig::default();
8196         zero_config.own_channel_config.our_htlc_minimum_msat = 0;
8197         let chanmon_cfgs = create_chanmon_cfgs(2);
8198         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
8199         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, Some(zero_config.clone())]);
8200         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
8201
8202         nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), 16_000_000, 12_000_000, 42, Some(zero_config)).unwrap();
8203         let res = get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id());
8204         assert_eq!(res.htlc_minimum_msat, 1);
8205
8206         nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), InitFeatures::known(), &res);
8207         let res = get_event_msg!(nodes[1], MessageSendEvent::SendAcceptChannel, nodes[0].node.get_our_node_id());
8208         assert_eq!(res.htlc_minimum_msat, 1);
8209 }
8210
8211 #[test]
8212 fn test_simple_mpp() {
8213         // Simple test of sending a multi-path payment.
8214         let chanmon_cfgs = create_chanmon_cfgs(4);
8215         let node_cfgs = create_node_cfgs(4, &chanmon_cfgs);
8216         let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs, &[None, None, None, None]);
8217         let nodes = create_network(4, &node_cfgs, &node_chanmgrs);
8218
8219         let chan_1_id = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
8220         let chan_2_id = create_announced_chan_between_nodes(&nodes, 0, 2, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
8221         let chan_3_id = create_announced_chan_between_nodes(&nodes, 1, 3, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
8222         let chan_4_id = create_announced_chan_between_nodes(&nodes, 2, 3, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
8223         let logger = test_utils::TestLogger::new();
8224
8225         let (payment_preimage, payment_hash, payment_secret) = get_payment_preimage_hash!(&nodes[3]);
8226         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
8227         let mut route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[3].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], 100000, TEST_FINAL_CLTV, &logger).unwrap();
8228         let path = route.paths[0].clone();
8229         route.paths.push(path);
8230         route.paths[0][0].pubkey = nodes[1].node.get_our_node_id();
8231         route.paths[0][0].short_channel_id = chan_1_id;
8232         route.paths[0][1].short_channel_id = chan_3_id;
8233         route.paths[1][0].pubkey = nodes[2].node.get_our_node_id();
8234         route.paths[1][0].short_channel_id = chan_2_id;
8235         route.paths[1][1].short_channel_id = chan_4_id;
8236         send_along_route_with_secret(&nodes[0], route, &[&[&nodes[1], &nodes[3]], &[&nodes[2], &nodes[3]]], 200_000, payment_hash, payment_secret);
8237         claim_payment_along_route(&nodes[0], &[&[&nodes[1], &nodes[3]], &[&nodes[2], &nodes[3]]], false, payment_preimage);
8238 }
8239
8240 #[test]
8241 fn test_preimage_storage() {
8242         // Simple test of payment preimage storage allowing no client-side storage to claim payments
8243         let chanmon_cfgs = create_chanmon_cfgs(2);
8244         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
8245         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
8246         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
8247
8248         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
8249
8250         {
8251                 let (payment_hash, payment_secret) = nodes[1].node.create_inbound_payment(Some(100_000), 7200, 42);
8252
8253                 let logger = test_utils::TestLogger::new();
8254                 let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
8255                 let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], 100_000, TEST_FINAL_CLTV, &logger).unwrap();
8256                 nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap();
8257                 check_added_monitors!(nodes[0], 1);
8258                 let mut events = nodes[0].node.get_and_clear_pending_msg_events();
8259                 let mut payment_event = SendEvent::from_event(events.pop().unwrap());
8260                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
8261                 commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
8262         }
8263         // Note that after leaving the above scope we have no knowledge of any arguments or return
8264         // values from previous calls.
8265         expect_pending_htlcs_forwardable!(nodes[1]);
8266         let events = nodes[1].node.get_and_clear_pending_events();
8267         assert_eq!(events.len(), 1);
8268         match events[0] {
8269                 Event::PaymentReceived { ref purpose, .. } => {
8270                         match &purpose {
8271                                 PaymentPurpose::InvoicePayment { payment_preimage, user_payment_id, .. } => {
8272                                         assert_eq!(*user_payment_id, 42);
8273                                         claim_payment(&nodes[0], &[&nodes[1]], payment_preimage.unwrap());
8274                                 },
8275                                 _ => panic!("expected PaymentPurpose::InvoicePayment")
8276                         }
8277                 },
8278                 _ => panic!("Unexpected event"),
8279         }
8280 }
8281
8282 #[test]
8283 fn test_secret_timeout() {
8284         // Simple test of payment secret storage time outs
8285         let chanmon_cfgs = create_chanmon_cfgs(2);
8286         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
8287         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
8288         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
8289
8290         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
8291
8292         let (payment_hash, payment_secret_1) = nodes[1].node.create_inbound_payment(Some(100_000), 2, 0);
8293
8294         // We should fail to register the same payment hash twice, at least until we've connected a
8295         // block with time 7200 + CHAN_CONFIRM_DEPTH + 1.
8296         if let Err(APIError::APIMisuseError { err }) = nodes[1].node.create_inbound_payment_for_hash(payment_hash, Some(100_000), 2, 0) {
8297                 assert_eq!(err, "Duplicate payment hash");
8298         } else { panic!(); }
8299         let mut block = {
8300                 let node_1_blocks = nodes[1].blocks.lock().unwrap();
8301                 Block {
8302                         header: BlockHeader {
8303                                 version: 0x2000000,
8304                                 prev_blockhash: node_1_blocks.last().unwrap().0.block_hash(),
8305                                 merkle_root: Default::default(),
8306                                 time: node_1_blocks.len() as u32 + 7200, bits: 42, nonce: 42 },
8307                         txdata: vec![],
8308                 }
8309         };
8310         connect_block(&nodes[1], &block);
8311         if let Err(APIError::APIMisuseError { err }) = nodes[1].node.create_inbound_payment_for_hash(payment_hash, Some(100_000), 2, 0) {
8312                 assert_eq!(err, "Duplicate payment hash");
8313         } else { panic!(); }
8314
8315         // If we then connect the second block, we should be able to register the same payment hash
8316         // again with a different user_payment_id (this time getting a new payment secret).
8317         block.header.prev_blockhash = block.header.block_hash();
8318         block.header.time += 1;
8319         connect_block(&nodes[1], &block);
8320         let our_payment_secret = nodes[1].node.create_inbound_payment_for_hash(payment_hash, Some(100_000), 2, 42).unwrap();
8321         assert_ne!(payment_secret_1, our_payment_secret);
8322
8323         {
8324                 let logger = test_utils::TestLogger::new();
8325                 let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
8326                 let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], 100_000, TEST_FINAL_CLTV, &logger).unwrap();
8327                 nodes[0].node.send_payment(&route, payment_hash, &Some(our_payment_secret)).unwrap();
8328                 check_added_monitors!(nodes[0], 1);
8329                 let mut events = nodes[0].node.get_and_clear_pending_msg_events();
8330                 let mut payment_event = SendEvent::from_event(events.pop().unwrap());
8331                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
8332                 commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
8333         }
8334         // Note that after leaving the above scope we have no knowledge of any arguments or return
8335         // values from previous calls.
8336         expect_pending_htlcs_forwardable!(nodes[1]);
8337         let events = nodes[1].node.get_and_clear_pending_events();
8338         assert_eq!(events.len(), 1);
8339         match events[0] {
8340                 Event::PaymentReceived { purpose: PaymentPurpose::InvoicePayment { payment_preimage, payment_secret, user_payment_id }, .. } => {
8341                         assert!(payment_preimage.is_none());
8342                         assert_eq!(user_payment_id, 42);
8343                         assert_eq!(payment_secret, our_payment_secret);
8344                         // We don't actually have the payment preimage with which to claim this payment!
8345                 },
8346                 _ => panic!("Unexpected event"),
8347         }
8348 }
8349
8350 #[test]
8351 fn test_bad_secret_hash() {
8352         // Simple test of unregistered payment hash/invalid payment secret handling
8353         let chanmon_cfgs = create_chanmon_cfgs(2);
8354         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
8355         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
8356         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
8357
8358         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
8359
8360         let random_payment_hash = PaymentHash([42; 32]);
8361         let random_payment_secret = PaymentSecret([43; 32]);
8362         let (our_payment_hash, our_payment_secret) = nodes[1].node.create_inbound_payment(Some(100_000), 2, 0);
8363
8364         let logger = test_utils::TestLogger::new();
8365         let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
8366         let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[1].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], 100_000, TEST_FINAL_CLTV, &logger).unwrap();
8367
8368         // All the below cases should end up being handled exactly identically, so we macro the
8369         // resulting events.
8370         macro_rules! handle_unknown_invalid_payment_data {
8371                 () => {
8372                         check_added_monitors!(nodes[0], 1);
8373                         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
8374                         let payment_event = SendEvent::from_event(events.pop().unwrap());
8375                         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
8376                         commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
8377
8378                         // We have to forward pending HTLCs once to process the receipt of the HTLC and then
8379                         // again to process the pending backwards-failure of the HTLC
8380                         expect_pending_htlcs_forwardable!(nodes[1]);
8381                         expect_pending_htlcs_forwardable!(nodes[1]);
8382                         check_added_monitors!(nodes[1], 1);
8383
8384                         // We should fail the payment back
8385                         let mut events = nodes[1].node.get_and_clear_pending_msg_events();
8386                         match events.pop().unwrap() {
8387                                 MessageSendEvent::UpdateHTLCs { node_id: _, updates: msgs::CommitmentUpdate { update_fail_htlcs, commitment_signed, .. } } => {
8388                                         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &update_fail_htlcs[0]);
8389                                         commitment_signed_dance!(nodes[0], nodes[1], commitment_signed, false);
8390                                 },
8391                                 _ => panic!("Unexpected event"),
8392                         }
8393                 }
8394         }
8395
8396         let expected_error_code = 0x4000|15; // incorrect_or_unknown_payment_details
8397         // Error data is the HTLC value (100,000) and current block height
8398         let expected_error_data = [0, 0, 0, 0, 0, 1, 0x86, 0xa0, 0, 0, 0, CHAN_CONFIRM_DEPTH as u8];
8399
8400         // Send a payment with the right payment hash but the wrong payment secret
8401         nodes[0].node.send_payment(&route, our_payment_hash, &Some(random_payment_secret)).unwrap();
8402         handle_unknown_invalid_payment_data!();
8403         expect_payment_failed!(nodes[0], our_payment_hash, true, expected_error_code, expected_error_data);
8404
8405         // Send a payment with a random payment hash, but the right payment secret
8406         nodes[0].node.send_payment(&route, random_payment_hash, &Some(our_payment_secret)).unwrap();
8407         handle_unknown_invalid_payment_data!();
8408         expect_payment_failed!(nodes[0], random_payment_hash, true, expected_error_code, expected_error_data);
8409
8410         // Send a payment with a random payment hash and random payment secret
8411         nodes[0].node.send_payment(&route, random_payment_hash, &Some(random_payment_secret)).unwrap();
8412         handle_unknown_invalid_payment_data!();
8413         expect_payment_failed!(nodes[0], random_payment_hash, true, expected_error_code, expected_error_data);
8414 }
8415
8416 #[test]
8417 fn test_update_err_monitor_lockdown() {
8418         // Our monitor will lock update of local commitment transaction if a broadcastion condition
8419         // has been fulfilled (either force-close from Channel or block height requiring a HTLC-
8420         // timeout). Trying to update monitor after lockdown should return a ChannelMonitorUpdateErr.
8421         //
8422         // This scenario may happen in a watchtower setup, where watchtower process a block height
8423         // triggering a timeout while a slow-block-processing ChannelManager receives a local signed
8424         // commitment at same time.
8425
8426         let chanmon_cfgs = create_chanmon_cfgs(2);
8427         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
8428         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
8429         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
8430
8431         // Create some initial channel
8432         let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
8433         let outpoint = OutPoint { txid: chan_1.3.txid(), index: 0 };
8434
8435         // Rebalance the network to generate htlc in the two directions
8436         send_payment(&nodes[0], &vec!(&nodes[1])[..], 10_000_000);
8437
8438         // Route a HTLC from node 0 to node 1 (but don't settle)
8439         let preimage = route_payment(&nodes[0], &vec!(&nodes[1])[..], 9_000_000).0;
8440
8441         // Copy ChainMonitor to simulate a watchtower and update block height of node 0 until its ChannelMonitor timeout HTLC onchain
8442         let chain_source = test_utils::TestChainSource::new(Network::Testnet);
8443         let logger = test_utils::TestLogger::with_id(format!("node {}", 0));
8444         let persister = test_utils::TestPersister::new();
8445         let watchtower = {
8446                 let monitors = nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap();
8447                 let monitor = monitors.get(&outpoint).unwrap();
8448                 let mut w = test_utils::TestVecWriter(Vec::new());
8449                 monitor.write(&mut w).unwrap();
8450                 let new_monitor = <(BlockHash, channelmonitor::ChannelMonitor<EnforcingSigner>)>::read(
8451                                 &mut io::Cursor::new(&w.0), &test_utils::OnlyReadsKeysInterface {}).unwrap().1;
8452                 assert!(new_monitor == *monitor);
8453                 let watchtower = test_utils::TestChainMonitor::new(Some(&chain_source), &chanmon_cfgs[0].tx_broadcaster, &logger, &chanmon_cfgs[0].fee_estimator, &persister, &node_cfgs[0].keys_manager);
8454                 assert!(watchtower.watch_channel(outpoint, new_monitor).is_ok());
8455                 watchtower
8456         };
8457         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
8458         // Make the tx_broadcaster aware of enough blocks that it doesn't think we're violating
8459         // transaction lock time requirements here.
8460         chanmon_cfgs[0].tx_broadcaster.blocks.lock().unwrap().resize(200, (header, 0));
8461         watchtower.chain_monitor.block_connected(&Block { header, txdata: vec![] }, 200);
8462
8463         // Try to update ChannelMonitor
8464         assert!(nodes[1].node.claim_funds(preimage));
8465         check_added_monitors!(nodes[1], 1);
8466         let updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
8467         assert_eq!(updates.update_fulfill_htlcs.len(), 1);
8468         nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &updates.update_fulfill_htlcs[0]);
8469         if let Some(ref mut channel) = nodes[0].node.channel_state.lock().unwrap().by_id.get_mut(&chan_1.2) {
8470                 if let Ok((_, _, update)) = channel.commitment_signed(&updates.commitment_signed, &node_cfgs[0].logger) {
8471                         if let Err(_) =  watchtower.chain_monitor.update_channel(outpoint, update.clone()) {} else { assert!(false); }
8472                         if let Ok(_) = nodes[0].chain_monitor.update_channel(outpoint, update) {} else { assert!(false); }
8473                 } else { assert!(false); }
8474         } else { assert!(false); };
8475         // Our local monitor is in-sync and hasn't processed yet timeout
8476         check_added_monitors!(nodes[0], 1);
8477         let events = nodes[0].node.get_and_clear_pending_events();
8478         assert_eq!(events.len(), 1);
8479 }
8480
8481 #[test]
8482 fn test_concurrent_monitor_claim() {
8483         // Watchtower A receives block, broadcasts state N, then channel receives new state N+1,
8484         // sending it to both watchtowers, Bob accepts N+1, then receives block and broadcasts
8485         // the latest state N+1, Alice rejects state N+1, but Bob has already broadcast it,
8486         // state N+1 confirms. Alice claims output from state N+1.
8487
8488         let chanmon_cfgs = create_chanmon_cfgs(2);
8489         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
8490         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
8491         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
8492
8493         // Create some initial channel
8494         let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
8495         let outpoint = OutPoint { txid: chan_1.3.txid(), index: 0 };
8496
8497         // Rebalance the network to generate htlc in the two directions
8498         send_payment(&nodes[0], &vec!(&nodes[1])[..], 10_000_000);
8499
8500         // Route a HTLC from node 0 to node 1 (but don't settle)
8501         route_payment(&nodes[0], &vec!(&nodes[1])[..], 9_000_000).0;
8502
8503         // Copy ChainMonitor to simulate watchtower Alice and update block height her ChannelMonitor timeout HTLC onchain
8504         let chain_source = test_utils::TestChainSource::new(Network::Testnet);
8505         let logger = test_utils::TestLogger::with_id(format!("node {}", "Alice"));
8506         let persister = test_utils::TestPersister::new();
8507         let watchtower_alice = {
8508                 let monitors = nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap();
8509                 let monitor = monitors.get(&outpoint).unwrap();
8510                 let mut w = test_utils::TestVecWriter(Vec::new());
8511                 monitor.write(&mut w).unwrap();
8512                 let new_monitor = <(BlockHash, channelmonitor::ChannelMonitor<EnforcingSigner>)>::read(
8513                                 &mut io::Cursor::new(&w.0), &test_utils::OnlyReadsKeysInterface {}).unwrap().1;
8514                 assert!(new_monitor == *monitor);
8515                 let watchtower = test_utils::TestChainMonitor::new(Some(&chain_source), &chanmon_cfgs[0].tx_broadcaster, &logger, &chanmon_cfgs[0].fee_estimator, &persister, &node_cfgs[0].keys_manager);
8516                 assert!(watchtower.watch_channel(outpoint, new_monitor).is_ok());
8517                 watchtower
8518         };
8519         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
8520         // Make the tx_broadcaster aware of enough blocks that it doesn't think we're violating
8521         // transaction lock time requirements here.
8522         chanmon_cfgs[0].tx_broadcaster.blocks.lock().unwrap().resize((CHAN_CONFIRM_DEPTH + 1 + TEST_FINAL_CLTV + LATENCY_GRACE_PERIOD_BLOCKS) as usize, (header, 0));
8523         watchtower_alice.chain_monitor.block_connected(&Block { header, txdata: vec![] }, CHAN_CONFIRM_DEPTH + 1 + TEST_FINAL_CLTV + LATENCY_GRACE_PERIOD_BLOCKS);
8524
8525         // Watchtower Alice should have broadcast a commitment/HTLC-timeout
8526         {
8527                 let mut txn = chanmon_cfgs[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
8528                 assert_eq!(txn.len(), 2);
8529                 txn.clear();
8530         }
8531
8532         // Copy ChainMonitor to simulate watchtower Bob and make it receive a commitment update first.
8533         let chain_source = test_utils::TestChainSource::new(Network::Testnet);
8534         let logger = test_utils::TestLogger::with_id(format!("node {}", "Bob"));
8535         let persister = test_utils::TestPersister::new();
8536         let watchtower_bob = {
8537                 let monitors = nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap();
8538                 let monitor = monitors.get(&outpoint).unwrap();
8539                 let mut w = test_utils::TestVecWriter(Vec::new());
8540                 monitor.write(&mut w).unwrap();
8541                 let new_monitor = <(BlockHash, channelmonitor::ChannelMonitor<EnforcingSigner>)>::read(
8542                                 &mut io::Cursor::new(&w.0), &test_utils::OnlyReadsKeysInterface {}).unwrap().1;
8543                 assert!(new_monitor == *monitor);
8544                 let watchtower = test_utils::TestChainMonitor::new(Some(&chain_source), &chanmon_cfgs[0].tx_broadcaster, &logger, &chanmon_cfgs[0].fee_estimator, &persister, &node_cfgs[0].keys_manager);
8545                 assert!(watchtower.watch_channel(outpoint, new_monitor).is_ok());
8546                 watchtower
8547         };
8548         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
8549         watchtower_bob.chain_monitor.block_connected(&Block { header, txdata: vec![] }, CHAN_CONFIRM_DEPTH + TEST_FINAL_CLTV + LATENCY_GRACE_PERIOD_BLOCKS);
8550
8551         // Route another payment to generate another update with still previous HTLC pending
8552         let (_, payment_hash, payment_secret) = get_payment_preimage_hash!(nodes[0]);
8553         {
8554                 let net_graph_msg_handler = &nodes[1].net_graph_msg_handler;
8555                 let route = get_route(&nodes[1].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[0].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 3000000 , TEST_FINAL_CLTV, &logger).unwrap();
8556                 nodes[1].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap();
8557         }
8558         check_added_monitors!(nodes[1], 1);
8559
8560         let updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
8561         assert_eq!(updates.update_add_htlcs.len(), 1);
8562         nodes[0].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &updates.update_add_htlcs[0]);
8563         if let Some(ref mut channel) = nodes[0].node.channel_state.lock().unwrap().by_id.get_mut(&chan_1.2) {
8564                 if let Ok((_, _, update)) = channel.commitment_signed(&updates.commitment_signed, &node_cfgs[0].logger) {
8565                         // Watchtower Alice should already have seen the block and reject the update
8566                         if let Err(_) =  watchtower_alice.chain_monitor.update_channel(outpoint, update.clone()) {} else { assert!(false); }
8567                         if let Ok(_) = watchtower_bob.chain_monitor.update_channel(outpoint, update.clone()) {} else { assert!(false); }
8568                         if let Ok(_) = nodes[0].chain_monitor.update_channel(outpoint, update) {} else { assert!(false); }
8569                 } else { assert!(false); }
8570         } else { assert!(false); };
8571         // Our local monitor is in-sync and hasn't processed yet timeout
8572         check_added_monitors!(nodes[0], 1);
8573
8574         //// Provide one more block to watchtower Bob, expect broadcast of commitment and HTLC-Timeout
8575         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
8576         watchtower_bob.chain_monitor.block_connected(&Block { header, txdata: vec![] }, CHAN_CONFIRM_DEPTH + 1 + TEST_FINAL_CLTV + LATENCY_GRACE_PERIOD_BLOCKS);
8577
8578         // Watchtower Bob should have broadcast a commitment/HTLC-timeout
8579         let bob_state_y;
8580         {
8581                 let mut txn = chanmon_cfgs[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
8582                 assert_eq!(txn.len(), 2);
8583                 bob_state_y = txn[0].clone();
8584                 txn.clear();
8585         };
8586
8587         // We confirm Bob's state Y on Alice, she should broadcast a HTLC-timeout
8588         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
8589         watchtower_alice.chain_monitor.block_connected(&Block { header, txdata: vec![bob_state_y.clone()] }, CHAN_CONFIRM_DEPTH + 2 + TEST_FINAL_CLTV + LATENCY_GRACE_PERIOD_BLOCKS);
8590         {
8591                 let htlc_txn = chanmon_cfgs[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
8592                 // We broadcast twice the transaction, once due to the HTLC-timeout, once due
8593                 // the onchain detection of the HTLC output
8594                 assert_eq!(htlc_txn.len(), 2);
8595                 check_spends!(htlc_txn[0], bob_state_y);
8596                 check_spends!(htlc_txn[1], bob_state_y);
8597         }
8598 }
8599
8600 #[test]
8601 fn test_pre_lockin_no_chan_closed_update() {
8602         // Test that if a peer closes a channel in response to a funding_created message we don't
8603         // generate a channel update (as the channel cannot appear on chain without a funding_signed
8604         // message).
8605         //
8606         // Doing so would imply a channel monitor update before the initial channel monitor
8607         // registration, violating our API guarantees.
8608         //
8609         // Previously, full_stack_target managed to hit this case by opening then closing a channel,
8610         // then opening a second channel with the same funding output as the first (which is not
8611         // rejected because the first channel does not exist in the ChannelManager) and closing it
8612         // before receiving funding_signed.
8613         let chanmon_cfgs = create_chanmon_cfgs(2);
8614         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
8615         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
8616         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
8617
8618         // Create an initial channel
8619         nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), 100000, 10001, 42, None).unwrap();
8620         let mut open_chan_msg = get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id());
8621         nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), InitFeatures::known(), &open_chan_msg);
8622         let accept_chan_msg = get_event_msg!(nodes[1], MessageSendEvent::SendAcceptChannel, nodes[0].node.get_our_node_id());
8623         nodes[0].node.handle_accept_channel(&nodes[1].node.get_our_node_id(), InitFeatures::known(), &accept_chan_msg);
8624
8625         // Move the first channel through the funding flow...
8626         let (temporary_channel_id, tx, _) = create_funding_transaction(&nodes[0], 100000, 42);
8627
8628         nodes[0].node.funding_transaction_generated(&temporary_channel_id, tx.clone()).unwrap();
8629         check_added_monitors!(nodes[0], 0);
8630
8631         let funding_created_msg = get_event_msg!(nodes[0], MessageSendEvent::SendFundingCreated, nodes[1].node.get_our_node_id());
8632         let channel_id = ::chain::transaction::OutPoint { txid: funding_created_msg.funding_txid, index: funding_created_msg.funding_output_index }.to_channel_id();
8633         nodes[0].node.handle_error(&nodes[1].node.get_our_node_id(), &msgs::ErrorMessage { channel_id, data: "Hi".to_owned() });
8634         assert!(nodes[0].chain_monitor.added_monitors.lock().unwrap().is_empty());
8635         check_closed_event!(nodes[0], 1, ClosureReason::CounterpartyForceClosed { peer_msg: "Hi".to_string() });
8636 }
8637
8638 #[test]
8639 fn test_htlc_no_detection() {
8640         // This test is a mutation to underscore the detection logic bug we had
8641         // before #653. HTLC value routed is above the remaining balance, thus
8642         // inverting HTLC and `to_remote` output. HTLC will come second and
8643         // it wouldn't be seen by pre-#653 detection as we were enumerate()'ing
8644         // on a watched outputs vector (Vec<TxOut>) thus implicitly relying on
8645         // outputs order detection for correct spending children filtring.
8646
8647         let chanmon_cfgs = create_chanmon_cfgs(2);
8648         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
8649         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
8650         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
8651
8652         // Create some initial channels
8653         let chan_1 = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, InitFeatures::known(), InitFeatures::known());
8654
8655         send_payment(&nodes[0], &vec!(&nodes[1])[..], 1_000_000);
8656         let (_, our_payment_hash, _) = route_payment(&nodes[0], &vec!(&nodes[1])[..], 2_000_000);
8657         let local_txn = get_local_commitment_txn!(nodes[0], chan_1.2);
8658         assert_eq!(local_txn[0].input.len(), 1);
8659         assert_eq!(local_txn[0].output.len(), 3);
8660         check_spends!(local_txn[0], chan_1.3);
8661
8662         // Timeout HTLC on A's chain and so it can generate a HTLC-Timeout tx
8663         let header = BlockHeader { version: 0x20000000, prev_blockhash: nodes[0].best_block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
8664         connect_block(&nodes[0], &Block { header, txdata: vec![local_txn[0].clone()] });
8665         // We deliberately connect the local tx twice as this should provoke a failure calling
8666         // this test before #653 fix.
8667         chain::Listen::block_connected(&nodes[0].chain_monitor.chain_monitor, &Block { header, txdata: vec![local_txn[0].clone()] }, nodes[0].best_block_info().1 + 1);
8668         check_closed_broadcast!(nodes[0], true);
8669         check_added_monitors!(nodes[0], 1);
8670         check_closed_event!(nodes[0], 1, ClosureReason::CommitmentTxConfirmed);
8671         connect_blocks(&nodes[0], TEST_FINAL_CLTV - 1);
8672
8673         let htlc_timeout = {
8674                 let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
8675                 assert_eq!(node_txn[1].input.len(), 1);
8676                 assert_eq!(node_txn[1].input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
8677                 check_spends!(node_txn[1], local_txn[0]);
8678                 node_txn[1].clone()
8679         };
8680
8681         let header_201 = BlockHeader { version: 0x20000000, prev_blockhash: nodes[0].best_block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
8682         connect_block(&nodes[0], &Block { header: header_201, txdata: vec![htlc_timeout.clone()] });
8683         connect_blocks(&nodes[0], ANTI_REORG_DELAY - 1);
8684         expect_payment_failed!(nodes[0], our_payment_hash, true);
8685 }
8686
8687 fn do_test_onchain_htlc_settlement_after_close(broadcast_alice: bool, go_onchain_before_fulfill: bool) {
8688         // If we route an HTLC, then learn the HTLC's preimage after the upstream channel has been
8689         // force-closed, we must claim that HTLC on-chain. (Given an HTLC forwarded from Alice --> Bob -->
8690         // Carol, Alice would be the upstream node, and Carol the downstream.)
8691         //
8692         // Steps of the test:
8693         // 1) Alice sends a HTLC to Carol through Bob.
8694         // 2) Carol doesn't settle the HTLC.
8695         // 3) If broadcast_alice is true, Alice force-closes her channel with Bob. Else Bob force closes.
8696         // Steps 4 and 5 may be reordered depending on go_onchain_before_fulfill.
8697         // 4) Bob sees the Alice's commitment on his chain or vice versa. An offered output is present
8698         //    but can't be claimed as Bob doesn't have yet knowledge of the preimage.
8699         // 5) Carol release the preimage to Bob off-chain.
8700         // 6) Bob claims the offered output on the broadcasted commitment.
8701         let chanmon_cfgs = create_chanmon_cfgs(3);
8702         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
8703         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
8704         let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
8705
8706         // Create some initial channels
8707         let chan_ab = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, InitFeatures::known(), InitFeatures::known());
8708         create_announced_chan_between_nodes_with_value(&nodes, 1, 2, 100000, 10001, InitFeatures::known(), InitFeatures::known());
8709
8710         // Steps (1) and (2):
8711         // Send an HTLC Alice --> Bob --> Carol, but Carol doesn't settle the HTLC back.
8712         let (payment_preimage, _payment_hash, _payment_secret) = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), 3_000_000);
8713
8714         // Check that Alice's commitment transaction now contains an output for this HTLC.
8715         let alice_txn = get_local_commitment_txn!(nodes[0], chan_ab.2);
8716         check_spends!(alice_txn[0], chan_ab.3);
8717         assert_eq!(alice_txn[0].output.len(), 2);
8718         check_spends!(alice_txn[1], alice_txn[0]); // 2nd transaction is a non-final HTLC-timeout
8719         assert_eq!(alice_txn[1].input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
8720         assert_eq!(alice_txn.len(), 2);
8721
8722         // Steps (3) and (4):
8723         // If `go_onchain_before_fufill`, broadcast the relevant commitment transaction and check that Bob
8724         // responds by (1) broadcasting a channel update and (2) adding a new ChannelMonitor.
8725         let mut force_closing_node = 0; // Alice force-closes
8726         if !broadcast_alice { force_closing_node = 1; } // Bob force-closes
8727         nodes[force_closing_node].node.force_close_channel(&chan_ab.2).unwrap();
8728         check_closed_broadcast!(nodes[force_closing_node], true);
8729         check_added_monitors!(nodes[force_closing_node], 1);
8730         check_closed_event!(nodes[force_closing_node], 1, ClosureReason::HolderForceClosed);
8731         if go_onchain_before_fulfill {
8732                 let txn_to_broadcast = match broadcast_alice {
8733                         true => alice_txn.clone(),
8734                         false => get_local_commitment_txn!(nodes[1], chan_ab.2)
8735                 };
8736                 let header = BlockHeader { version: 0x20000000, prev_blockhash: nodes[1].best_block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42};
8737                 connect_block(&nodes[1], &Block { header, txdata: vec![txn_to_broadcast[0].clone()]});
8738                 let mut bob_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
8739                 if broadcast_alice {
8740                         check_closed_broadcast!(nodes[1], true);
8741                         check_added_monitors!(nodes[1], 1);
8742                         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
8743                 }
8744                 assert_eq!(bob_txn.len(), 1);
8745                 check_spends!(bob_txn[0], chan_ab.3);
8746         }
8747
8748         // Step (5):
8749         // Carol then claims the funds and sends an update_fulfill message to Bob, and they go through the
8750         // process of removing the HTLC from their commitment transactions.
8751         assert!(nodes[2].node.claim_funds(payment_preimage));
8752         check_added_monitors!(nodes[2], 1);
8753         let carol_updates = get_htlc_update_msgs!(nodes[2], nodes[1].node.get_our_node_id());
8754         assert!(carol_updates.update_add_htlcs.is_empty());
8755         assert!(carol_updates.update_fail_htlcs.is_empty());
8756         assert!(carol_updates.update_fail_malformed_htlcs.is_empty());
8757         assert!(carol_updates.update_fee.is_none());
8758         assert_eq!(carol_updates.update_fulfill_htlcs.len(), 1);
8759
8760         nodes[1].node.handle_update_fulfill_htlc(&nodes[2].node.get_our_node_id(), &carol_updates.update_fulfill_htlcs[0]);
8761         expect_payment_forwarded!(nodes[1], if go_onchain_before_fulfill || force_closing_node == 1 { None } else { Some(1000) }, false);
8762         // If Alice broadcasted but Bob doesn't know yet, here he prepares to tell her about the preimage.
8763         if !go_onchain_before_fulfill && broadcast_alice {
8764                 let events = nodes[1].node.get_and_clear_pending_msg_events();
8765                 assert_eq!(events.len(), 1);
8766                 match events[0] {
8767                         MessageSendEvent::UpdateHTLCs { ref node_id, .. } => {
8768                                 assert_eq!(*node_id, nodes[0].node.get_our_node_id());
8769                         },
8770                         _ => panic!("Unexpected event"),
8771                 };
8772         }
8773         nodes[1].node.handle_commitment_signed(&nodes[2].node.get_our_node_id(), &carol_updates.commitment_signed);
8774         // One monitor update for the preimage to update the Bob<->Alice channel, one monitor update
8775         // Carol<->Bob's updated commitment transaction info.
8776         check_added_monitors!(nodes[1], 2);
8777
8778         let events = nodes[1].node.get_and_clear_pending_msg_events();
8779         assert_eq!(events.len(), 2);
8780         let bob_revocation = match events[0] {
8781                 MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
8782                         assert_eq!(*node_id, nodes[2].node.get_our_node_id());
8783                         (*msg).clone()
8784                 },
8785                 _ => panic!("Unexpected event"),
8786         };
8787         let bob_updates = match events[1] {
8788                 MessageSendEvent::UpdateHTLCs { ref node_id, ref updates } => {
8789                         assert_eq!(*node_id, nodes[2].node.get_our_node_id());
8790                         (*updates).clone()
8791                 },
8792                 _ => panic!("Unexpected event"),
8793         };
8794
8795         nodes[2].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bob_revocation);
8796         check_added_monitors!(nodes[2], 1);
8797         nodes[2].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &bob_updates.commitment_signed);
8798         check_added_monitors!(nodes[2], 1);
8799
8800         let events = nodes[2].node.get_and_clear_pending_msg_events();
8801         assert_eq!(events.len(), 1);
8802         let carol_revocation = match events[0] {
8803                 MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
8804                         assert_eq!(*node_id, nodes[1].node.get_our_node_id());
8805                         (*msg).clone()
8806                 },
8807                 _ => panic!("Unexpected event"),
8808         };
8809         nodes[1].node.handle_revoke_and_ack(&nodes[2].node.get_our_node_id(), &carol_revocation);
8810         check_added_monitors!(nodes[1], 1);
8811
8812         // If this test requires the force-closed channel to not be on-chain until after the fulfill,
8813         // here's where we put said channel's commitment tx on-chain.
8814         let mut txn_to_broadcast = alice_txn.clone();
8815         if !broadcast_alice { txn_to_broadcast = get_local_commitment_txn!(nodes[1], chan_ab.2); }
8816         if !go_onchain_before_fulfill {
8817                 let header = BlockHeader { version: 0x20000000, prev_blockhash: nodes[1].best_block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42};
8818                 connect_block(&nodes[1], &Block { header, txdata: vec![txn_to_broadcast[0].clone()]});
8819                 // If Bob was the one to force-close, he will have already passed these checks earlier.
8820                 if broadcast_alice {
8821                         check_closed_broadcast!(nodes[1], true);
8822                         check_added_monitors!(nodes[1], 1);
8823                         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
8824                 }
8825                 let mut bob_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
8826                 if broadcast_alice {
8827                         // In `connect_block()`, the ChainMonitor and ChannelManager are separately notified about a
8828                         // new block being connected. The ChannelManager being notified triggers a monitor update,
8829                         // which triggers broadcasting our commitment tx and an HTLC-claiming tx. The ChainMonitor
8830                         // being notified triggers the HTLC-claiming tx redundantly, resulting in 3 total txs being
8831                         // broadcasted.
8832                         assert_eq!(bob_txn.len(), 3);
8833                         check_spends!(bob_txn[1], chan_ab.3);
8834                 } else {
8835                         assert_eq!(bob_txn.len(), 2);
8836                         check_spends!(bob_txn[0], chan_ab.3);
8837                 }
8838         }
8839
8840         // Step (6):
8841         // Finally, check that Bob broadcasted a preimage-claiming transaction for the HTLC output on the
8842         // broadcasted commitment transaction.
8843         {
8844                 let bob_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap().clone();
8845                 if go_onchain_before_fulfill {
8846                         // Bob should now have an extra broadcasted tx, for the preimage-claiming transaction.
8847                         assert_eq!(bob_txn.len(), 2);
8848                 }
8849                 let script_weight = match broadcast_alice {
8850                         true => OFFERED_HTLC_SCRIPT_WEIGHT,
8851                         false => ACCEPTED_HTLC_SCRIPT_WEIGHT
8852                 };
8853                 // If Alice force-closed and Bob didn't receive her commitment transaction until after he
8854                 // received Carol's fulfill, he broadcasts the HTLC-output-claiming transaction first. Else if
8855                 // Bob force closed or if he found out about Alice's commitment tx before receiving Carol's
8856                 // fulfill, then he broadcasts the HTLC-output-claiming transaction second.
8857                 if broadcast_alice && !go_onchain_before_fulfill {
8858                         check_spends!(bob_txn[0], txn_to_broadcast[0]);
8859                         assert_eq!(bob_txn[0].input[0].witness.last().unwrap().len(), script_weight);
8860                 } else {
8861                         check_spends!(bob_txn[1], txn_to_broadcast[0]);
8862                         assert_eq!(bob_txn[1].input[0].witness.last().unwrap().len(), script_weight);
8863                 }
8864         }
8865 }
8866
8867 #[test]
8868 fn test_onchain_htlc_settlement_after_close() {
8869         do_test_onchain_htlc_settlement_after_close(true, true);
8870         do_test_onchain_htlc_settlement_after_close(false, true); // Technically redundant, but may as well
8871         do_test_onchain_htlc_settlement_after_close(true, false);
8872         do_test_onchain_htlc_settlement_after_close(false, false);
8873 }
8874
8875 #[test]
8876 fn test_duplicate_chan_id() {
8877         // Test that if a given peer tries to open a channel with the same channel_id as one that is
8878         // already open we reject it and keep the old channel.
8879         //
8880         // Previously, full_stack_target managed to figure out that if you tried to open two channels
8881         // with the same funding output (ie post-funding channel_id), we'd create a monitor update for
8882         // the existing channel when we detect the duplicate new channel, screwing up our monitor
8883         // updating logic for the existing channel.
8884         let chanmon_cfgs = create_chanmon_cfgs(2);
8885         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
8886         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
8887         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
8888
8889         // Create an initial channel
8890         nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), 100000, 10001, 42, None).unwrap();
8891         let mut open_chan_msg = get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id());
8892         nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), InitFeatures::known(), &open_chan_msg);
8893         nodes[0].node.handle_accept_channel(&nodes[1].node.get_our_node_id(), InitFeatures::known(), &get_event_msg!(nodes[1], MessageSendEvent::SendAcceptChannel, nodes[0].node.get_our_node_id()));
8894
8895         // Try to create a second channel with the same temporary_channel_id as the first and check
8896         // that it is rejected.
8897         nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), InitFeatures::known(), &open_chan_msg);
8898         {
8899                 let events = nodes[1].node.get_and_clear_pending_msg_events();
8900                 assert_eq!(events.len(), 1);
8901                 match events[0] {
8902                         MessageSendEvent::HandleError { action: ErrorAction::SendErrorMessage { ref msg }, node_id } => {
8903                                 // Technically, at this point, nodes[1] would be justified in thinking both the
8904                                 // first (valid) and second (invalid) channels are closed, given they both have
8905                                 // the same non-temporary channel_id. However, currently we do not, so we just
8906                                 // move forward with it.
8907                                 assert_eq!(msg.channel_id, open_chan_msg.temporary_channel_id);
8908                                 assert_eq!(node_id, nodes[0].node.get_our_node_id());
8909                         },
8910                         _ => panic!("Unexpected event"),
8911                 }
8912         }
8913
8914         // Move the first channel through the funding flow...
8915         let (temporary_channel_id, tx, funding_output) = create_funding_transaction(&nodes[0], 100000, 42);
8916
8917         nodes[0].node.funding_transaction_generated(&temporary_channel_id, tx.clone()).unwrap();
8918         check_added_monitors!(nodes[0], 0);
8919
8920         let mut funding_created_msg = get_event_msg!(nodes[0], MessageSendEvent::SendFundingCreated, nodes[1].node.get_our_node_id());
8921         nodes[1].node.handle_funding_created(&nodes[0].node.get_our_node_id(), &funding_created_msg);
8922         {
8923                 let mut added_monitors = nodes[1].chain_monitor.added_monitors.lock().unwrap();
8924                 assert_eq!(added_monitors.len(), 1);
8925                 assert_eq!(added_monitors[0].0, funding_output);
8926                 added_monitors.clear();
8927         }
8928         let funding_signed_msg = get_event_msg!(nodes[1], MessageSendEvent::SendFundingSigned, nodes[0].node.get_our_node_id());
8929
8930         let funding_outpoint = ::chain::transaction::OutPoint { txid: funding_created_msg.funding_txid, index: funding_created_msg.funding_output_index };
8931         let channel_id = funding_outpoint.to_channel_id();
8932
8933         // Now we have the first channel past funding_created (ie it has a txid-based channel_id, not a
8934         // temporary one).
8935
8936         // First try to open a second channel with a temporary channel id equal to the txid-based one.
8937         // Technically this is allowed by the spec, but we don't support it and there's little reason
8938         // to. Still, it shouldn't cause any other issues.
8939         open_chan_msg.temporary_channel_id = channel_id;
8940         nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), InitFeatures::known(), &open_chan_msg);
8941         {
8942                 let events = nodes[1].node.get_and_clear_pending_msg_events();
8943                 assert_eq!(events.len(), 1);
8944                 match events[0] {
8945                         MessageSendEvent::HandleError { action: ErrorAction::SendErrorMessage { ref msg }, node_id } => {
8946                                 // Technically, at this point, nodes[1] would be justified in thinking both
8947                                 // channels are closed, but currently we do not, so we just move forward with it.
8948                                 assert_eq!(msg.channel_id, open_chan_msg.temporary_channel_id);
8949                                 assert_eq!(node_id, nodes[0].node.get_our_node_id());
8950                         },
8951                         _ => panic!("Unexpected event"),
8952                 }
8953         }
8954
8955         // Now try to create a second channel which has a duplicate funding output.
8956         nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), 100000, 10001, 42, None).unwrap();
8957         let open_chan_2_msg = get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id());
8958         nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), InitFeatures::known(), &open_chan_2_msg);
8959         nodes[0].node.handle_accept_channel(&nodes[1].node.get_our_node_id(), InitFeatures::known(), &get_event_msg!(nodes[1], MessageSendEvent::SendAcceptChannel, nodes[0].node.get_our_node_id()));
8960         create_funding_transaction(&nodes[0], 100000, 42); // Get and check the FundingGenerationReady event
8961
8962         let funding_created = {
8963                 let mut a_channel_lock = nodes[0].node.channel_state.lock().unwrap();
8964                 let mut as_chan = a_channel_lock.by_id.get_mut(&open_chan_2_msg.temporary_channel_id).unwrap();
8965                 let logger = test_utils::TestLogger::new();
8966                 as_chan.get_outbound_funding_created(tx.clone(), funding_outpoint, &&logger).unwrap()
8967         };
8968         check_added_monitors!(nodes[0], 0);
8969         nodes[1].node.handle_funding_created(&nodes[0].node.get_our_node_id(), &funding_created);
8970         // At this point we'll try to add a duplicate channel monitor, which will be rejected, but
8971         // still needs to be cleared here.
8972         check_added_monitors!(nodes[1], 1);
8973
8974         // ...still, nodes[1] will reject the duplicate channel.
8975         {
8976                 let events = nodes[1].node.get_and_clear_pending_msg_events();
8977                 assert_eq!(events.len(), 1);
8978                 match events[0] {
8979                         MessageSendEvent::HandleError { action: ErrorAction::SendErrorMessage { ref msg }, node_id } => {
8980                                 // Technically, at this point, nodes[1] would be justified in thinking both
8981                                 // channels are closed, but currently we do not, so we just move forward with it.
8982                                 assert_eq!(msg.channel_id, channel_id);
8983                                 assert_eq!(node_id, nodes[0].node.get_our_node_id());
8984                         },
8985                         _ => panic!("Unexpected event"),
8986                 }
8987         }
8988
8989         // finally, finish creating the original channel and send a payment over it to make sure
8990         // everything is functional.
8991         nodes[0].node.handle_funding_signed(&nodes[1].node.get_our_node_id(), &funding_signed_msg);
8992         {
8993                 let mut added_monitors = nodes[0].chain_monitor.added_monitors.lock().unwrap();
8994                 assert_eq!(added_monitors.len(), 1);
8995                 assert_eq!(added_monitors[0].0, funding_output);
8996                 added_monitors.clear();
8997         }
8998
8999         let events_4 = nodes[0].node.get_and_clear_pending_events();
9000         assert_eq!(events_4.len(), 0);
9001         assert_eq!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().len(), 1);
9002         assert_eq!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap()[0].txid(), funding_output.txid);
9003
9004         let (funding_locked, _) = create_chan_between_nodes_with_value_confirm(&nodes[0], &nodes[1], &tx);
9005         let (announcement, as_update, bs_update) = create_chan_between_nodes_with_value_b(&nodes[0], &nodes[1], &funding_locked);
9006         update_nodes_with_chan_announce(&nodes, 0, 1, &announcement, &as_update, &bs_update);
9007         send_payment(&nodes[0], &[&nodes[1]], 8000000);
9008 }
9009
9010 #[test]
9011 fn test_error_chans_closed() {
9012         // Test that we properly handle error messages, closing appropriate channels.
9013         //
9014         // Prior to #787 we'd allow a peer to make us force-close a channel we had with a different
9015         // peer. The "real" fix for that is to index channels with peers_ids, however in the mean time
9016         // we can test various edge cases around it to ensure we don't regress.
9017         let chanmon_cfgs = create_chanmon_cfgs(3);
9018         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
9019         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
9020         let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
9021
9022         // Create some initial channels
9023         let chan_1 = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, InitFeatures::known(), InitFeatures::known());
9024         let chan_2 = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, InitFeatures::known(), InitFeatures::known());
9025         let chan_3 = create_announced_chan_between_nodes_with_value(&nodes, 0, 2, 100000, 10001, InitFeatures::known(), InitFeatures::known());
9026
9027         assert_eq!(nodes[0].node.list_usable_channels().len(), 3);
9028         assert_eq!(nodes[1].node.list_usable_channels().len(), 2);
9029         assert_eq!(nodes[2].node.list_usable_channels().len(), 1);
9030
9031         // Closing a channel from a different peer has no effect
9032         nodes[0].node.handle_error(&nodes[1].node.get_our_node_id(), &msgs::ErrorMessage { channel_id: chan_3.2, data: "ERR".to_owned() });
9033         assert_eq!(nodes[0].node.list_usable_channels().len(), 3);
9034
9035         // Closing one channel doesn't impact others
9036         nodes[0].node.handle_error(&nodes[1].node.get_our_node_id(), &msgs::ErrorMessage { channel_id: chan_2.2, data: "ERR".to_owned() });
9037         check_added_monitors!(nodes[0], 1);
9038         check_closed_broadcast!(nodes[0], false);
9039         check_closed_event!(nodes[0], 1, ClosureReason::CounterpartyForceClosed { peer_msg: "ERR".to_string() });
9040         assert_eq!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().split_off(0).len(), 1);
9041         assert_eq!(nodes[0].node.list_usable_channels().len(), 2);
9042         assert!(nodes[0].node.list_usable_channels()[0].channel_id == chan_1.2 || nodes[0].node.list_usable_channels()[1].channel_id == chan_1.2);
9043         assert!(nodes[0].node.list_usable_channels()[0].channel_id == chan_3.2 || nodes[0].node.list_usable_channels()[1].channel_id == chan_3.2);
9044
9045         // A null channel ID should close all channels
9046         let _chan_4 = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, InitFeatures::known(), InitFeatures::known());
9047         nodes[0].node.handle_error(&nodes[1].node.get_our_node_id(), &msgs::ErrorMessage { channel_id: [0; 32], data: "ERR".to_owned() });
9048         check_added_monitors!(nodes[0], 2);
9049         check_closed_event!(nodes[0], 2, ClosureReason::CounterpartyForceClosed { peer_msg: "ERR".to_string() });
9050         let events = nodes[0].node.get_and_clear_pending_msg_events();
9051         assert_eq!(events.len(), 2);
9052         match events[0] {
9053                 MessageSendEvent::BroadcastChannelUpdate { ref msg } => {
9054                         assert_eq!(msg.contents.flags & 2, 2);
9055                 },
9056                 _ => panic!("Unexpected event"),
9057         }
9058         match events[1] {
9059                 MessageSendEvent::BroadcastChannelUpdate { ref msg } => {
9060                         assert_eq!(msg.contents.flags & 2, 2);
9061                 },
9062                 _ => panic!("Unexpected event"),
9063         }
9064         // Note that at this point users of a standard PeerHandler will end up calling
9065         // peer_disconnected with no_connection_possible set to false, duplicating the
9066         // close-all-channels logic. That's OK, we don't want to end up not force-closing channels for
9067         // users with their own peer handling logic. We duplicate the call here, however.
9068         assert_eq!(nodes[0].node.list_usable_channels().len(), 1);
9069         assert!(nodes[0].node.list_usable_channels()[0].channel_id == chan_3.2);
9070
9071         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), true);
9072         assert_eq!(nodes[0].node.list_usable_channels().len(), 1);
9073         assert!(nodes[0].node.list_usable_channels()[0].channel_id == chan_3.2);
9074 }
9075
9076 #[test]
9077 fn test_invalid_funding_tx() {
9078         // Test that we properly handle invalid funding transactions sent to us from a peer.
9079         //
9080         // Previously, all other major lightning implementations had failed to properly sanitize
9081         // funding transactions from their counterparties, leading to a multi-implementation critical
9082         // security vulnerability (though we always sanitized properly, we've previously had
9083         // un-released crashes in the sanitization process).
9084         let chanmon_cfgs = create_chanmon_cfgs(2);
9085         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
9086         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
9087         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
9088
9089         nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), 100_000, 10_000, 42, None).unwrap();
9090         nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), InitFeatures::known(), &get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id()));
9091         nodes[0].node.handle_accept_channel(&nodes[1].node.get_our_node_id(), InitFeatures::known(), &get_event_msg!(nodes[1], MessageSendEvent::SendAcceptChannel, nodes[0].node.get_our_node_id()));
9092
9093         let (temporary_channel_id, mut tx, _) = create_funding_transaction(&nodes[0], 100_000, 42);
9094         for output in tx.output.iter_mut() {
9095                 // Make the confirmed funding transaction have a bogus script_pubkey
9096                 output.script_pubkey = bitcoin::Script::new();
9097         }
9098
9099         nodes[0].node.funding_transaction_generated_unchecked(&temporary_channel_id, tx.clone(), 0).unwrap();
9100         nodes[1].node.handle_funding_created(&nodes[0].node.get_our_node_id(), &get_event_msg!(nodes[0], MessageSendEvent::SendFundingCreated, nodes[1].node.get_our_node_id()));
9101         check_added_monitors!(nodes[1], 1);
9102
9103         nodes[0].node.handle_funding_signed(&nodes[1].node.get_our_node_id(), &get_event_msg!(nodes[1], MessageSendEvent::SendFundingSigned, nodes[0].node.get_our_node_id()));
9104         check_added_monitors!(nodes[0], 1);
9105
9106         let events_1 = nodes[0].node.get_and_clear_pending_events();
9107         assert_eq!(events_1.len(), 0);
9108
9109         assert_eq!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().len(), 1);
9110         assert_eq!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap()[0], tx);
9111         nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().clear();
9112
9113         confirm_transaction_at(&nodes[1], &tx, 1);
9114         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
9115         check_added_monitors!(nodes[1], 1);
9116         let events_2 = nodes[1].node.get_and_clear_pending_msg_events();
9117         assert_eq!(events_2.len(), 1);
9118         if let MessageSendEvent::HandleError { node_id, action } = &events_2[0] {
9119                 assert_eq!(*node_id, nodes[0].node.get_our_node_id());
9120                 if let msgs::ErrorAction::SendErrorMessage { msg } = action {
9121                         assert_eq!(msg.data, "funding tx had wrong script/value or output index");
9122                 } else { panic!(); }
9123         } else { panic!(); }
9124         assert_eq!(nodes[1].node.list_channels().len(), 0);
9125 }
9126
9127 fn do_test_tx_confirmed_skipping_blocks_immediate_broadcast(test_height_before_timelock: bool) {
9128         // In the first version of the chain::Confirm interface, after a refactor was made to not
9129         // broadcast CSV-locked transactions until their CSV lock is up, we wouldn't reliably broadcast
9130         // transactions after a `transactions_confirmed` call. Specifically, if the chain, provided via
9131         // `best_block_updated` is at height N, and a transaction output which we wish to spend at
9132         // height N-1 (due to a CSV to height N-1) is provided at height N, we will not broadcast the
9133         // spending transaction until height N+1 (or greater). This was due to the way
9134         // `ChannelMonitor::transactions_confirmed` worked, only checking if we should broadcast a
9135         // spending transaction at the height the input transaction was confirmed at, not whether we
9136         // should broadcast a spending transaction at the current height.
9137         // A second, similar, issue involved failing HTLCs backwards - because we only provided the
9138         // height at which transactions were confirmed to `OnchainTx::update_claims_view`, it wasn't
9139         // aware that the anti-reorg-delay had, in fact, already expired, waiting to fail-backwards
9140         // until we learned about an additional block.
9141         //
9142         // As an additional check, if `test_height_before_timelock` is set, we instead test that we
9143         // aren't broadcasting transactions too early (ie not broadcasting them at all).
9144         let chanmon_cfgs = create_chanmon_cfgs(3);
9145         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
9146         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
9147         let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs);
9148         *nodes[0].connect_style.borrow_mut() = ConnectStyle::BestBlockFirstSkippingBlocks;
9149
9150         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
9151         let (chan_announce, _, channel_id, _) = create_announced_chan_between_nodes(&nodes, 1, 2, InitFeatures::known(), InitFeatures::known());
9152         let (_, payment_hash, _) = route_payment(&nodes[0], &[&nodes[1], &nodes[2]], 1_000_000);
9153         nodes[1].node.peer_disconnected(&nodes[2].node.get_our_node_id(), false);
9154         nodes[2].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
9155
9156         nodes[1].node.force_close_channel(&channel_id).unwrap();
9157         check_closed_broadcast!(nodes[1], true);
9158         check_closed_event!(nodes[1], 1, ClosureReason::HolderForceClosed);
9159         check_added_monitors!(nodes[1], 1);
9160         let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap().split_off(0);
9161         assert_eq!(node_txn.len(), 1);
9162
9163         let conf_height = nodes[1].best_block_info().1;
9164         if !test_height_before_timelock {
9165                 connect_blocks(&nodes[1], 24 * 6);
9166         }
9167         nodes[1].chain_monitor.chain_monitor.transactions_confirmed(
9168                 &nodes[1].get_block_header(conf_height), &[(0, &node_txn[0])], conf_height);
9169         if test_height_before_timelock {
9170                 // If we confirmed the close transaction, but timelocks have not yet expired, we should not
9171                 // generate any events or broadcast any transactions
9172                 assert!(nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap().is_empty());
9173                 assert!(nodes[1].chain_monitor.chain_monitor.get_and_clear_pending_events().is_empty());
9174         } else {
9175                 // We should broadcast an HTLC transaction spending our funding transaction first
9176                 let spending_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap().split_off(0);
9177                 assert_eq!(spending_txn.len(), 2);
9178                 assert_eq!(spending_txn[0], node_txn[0]);
9179                 check_spends!(spending_txn[1], node_txn[0]);
9180                 // We should also generate a SpendableOutputs event with the to_self output (as its
9181                 // timelock is up).
9182                 let descriptor_spend_txn = check_spendable_outputs!(nodes[1], node_cfgs[1].keys_manager);
9183                 assert_eq!(descriptor_spend_txn.len(), 1);
9184
9185                 // If we also discover that the HTLC-Timeout transaction was confirmed some time ago, we
9186                 // should immediately fail-backwards the HTLC to the previous hop, without waiting for an
9187                 // additional block built on top of the current chain.
9188                 nodes[1].chain_monitor.chain_monitor.transactions_confirmed(
9189                         &nodes[1].get_block_header(conf_height + 1), &[(0, &spending_txn[1])], conf_height + 1);
9190                 expect_pending_htlcs_forwardable!(nodes[1]);
9191                 check_added_monitors!(nodes[1], 1);
9192
9193                 let updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
9194                 assert!(updates.update_add_htlcs.is_empty());
9195                 assert!(updates.update_fulfill_htlcs.is_empty());
9196                 assert_eq!(updates.update_fail_htlcs.len(), 1);
9197                 assert!(updates.update_fail_malformed_htlcs.is_empty());
9198                 assert!(updates.update_fee.is_none());
9199                 nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &updates.update_fail_htlcs[0]);
9200                 commitment_signed_dance!(nodes[0], nodes[1], updates.commitment_signed, true, true);
9201                 expect_payment_failed_with_update!(nodes[0], payment_hash, false, chan_announce.contents.short_channel_id, true);
9202         }
9203 }
9204
9205 #[test]
9206 fn test_tx_confirmed_skipping_blocks_immediate_broadcast() {
9207         do_test_tx_confirmed_skipping_blocks_immediate_broadcast(false);
9208         do_test_tx_confirmed_skipping_blocks_immediate_broadcast(true);
9209 }
9210
9211 #[test]
9212 fn test_keysend_payments_to_public_node() {
9213         let chanmon_cfgs = create_chanmon_cfgs(2);
9214         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
9215         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
9216         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
9217
9218         let _chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, InitFeatures::known(), InitFeatures::known());
9219         let network_graph = &nodes[0].net_graph_msg_handler.network_graph;
9220         let payer_pubkey = nodes[0].node.get_our_node_id();
9221         let payee_pubkey = nodes[1].node.get_our_node_id();
9222         let route = get_route(&payer_pubkey, network_graph, &payee_pubkey, None,
9223                         None, &vec![], 10000, 40,
9224                         nodes[0].logger).unwrap();
9225
9226         let test_preimage = PaymentPreimage([42; 32]);
9227         let payment_hash = nodes[0].node.send_spontaneous_payment(&route, Some(test_preimage)).unwrap();
9228         check_added_monitors!(nodes[0], 1);
9229         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
9230         assert_eq!(events.len(), 1);
9231         let event = events.pop().unwrap();
9232         let path = vec![&nodes[1]];
9233         pass_along_path(&nodes[0], &path, 10000, payment_hash, None, event, true, Some(test_preimage));
9234         claim_payment(&nodes[0], &path, test_preimage);
9235 }
9236
9237 #[test]
9238 fn test_keysend_payments_to_private_node() {
9239         let chanmon_cfgs = create_chanmon_cfgs(2);
9240         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
9241         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
9242         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
9243
9244         let payer_pubkey = nodes[0].node.get_our_node_id();
9245         let payee_pubkey = nodes[1].node.get_our_node_id();
9246         nodes[0].node.peer_connected(&payee_pubkey, &msgs::Init { features: InitFeatures::known() });
9247         nodes[1].node.peer_connected(&payer_pubkey, &msgs::Init { features: InitFeatures::known() });
9248
9249         let _chan = create_chan_between_nodes(&nodes[0], &nodes[1], InitFeatures::known(), InitFeatures::known());
9250         let network_graph = &nodes[0].net_graph_msg_handler.network_graph;
9251         let first_hops = nodes[0].node.list_usable_channels();
9252         let route = get_keysend_route(&payer_pubkey, &network_graph, &payee_pubkey,
9253                                 Some(&first_hops.iter().collect::<Vec<_>>()), &vec![], 10000, 40,
9254                                 nodes[0].logger).unwrap();
9255
9256         let test_preimage = PaymentPreimage([42; 32]);
9257         let payment_hash = nodes[0].node.send_spontaneous_payment(&route, Some(test_preimage)).unwrap();
9258         check_added_monitors!(nodes[0], 1);
9259         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
9260         assert_eq!(events.len(), 1);
9261         let event = events.pop().unwrap();
9262         let path = vec![&nodes[1]];
9263         pass_along_path(&nodes[0], &path, 10000, payment_hash, None, event, true, Some(test_preimage));
9264         claim_payment(&nodes[0], &path, test_preimage);
9265 }
9266
9267 fn do_test_max_dust_htlc_exposure(dust_outbound_balance: bool, at_forward: bool, on_holder_tx: bool) {
9268         // Test that we properly reject dust HTLC violating our `max_dust_htlc_exposure_msat` policy.
9269         //
9270         // At HTLC forward (`send_payment()`), if the sum of the trimmed-to-dust HTLC inbound and
9271         // trimmed-to-dust HTLC outbound balance and this new payment as included on next counterparty
9272         // commitment are above our `max_dust_htlc_exposure_msat`, we'll reject the update.
9273         // At HTLC reception (`update_add_htlc()`), if the sum of the trimmed-to-dust HTLC inbound
9274         // and trimmed-to-dust HTLC outbound balance and this new received HTLC as included on next
9275         // counterparty commitment are above our `max_dust_htlc_exposure_msat`, we'll fail the update.
9276         // Note, we return a `temporary_channel_failure` (0x1000 | 7), as the channel might be
9277         // available again for HTLC processing once the dust bandwidth has cleared up.
9278
9279         let chanmon_cfgs = create_chanmon_cfgs(2);
9280         let mut config = test_default_channel_config();
9281         config.channel_options.max_dust_htlc_exposure_msat = 5_000_000; // default setting value
9282         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
9283         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, Some(config)]);
9284         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
9285
9286         nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), 1_000_000, 500_000_000, 42, None).unwrap();
9287         let mut open_channel = get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id());
9288         open_channel.max_htlc_value_in_flight_msat = 50_000_000;
9289         open_channel.max_accepted_htlcs = 60;
9290         nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), InitFeatures::known(), &open_channel);
9291         let mut accept_channel = get_event_msg!(nodes[1], MessageSendEvent::SendAcceptChannel, nodes[0].node.get_our_node_id());
9292         if on_holder_tx {
9293                 accept_channel.dust_limit_satoshis = 660;
9294         }
9295         nodes[0].node.handle_accept_channel(&nodes[1].node.get_our_node_id(), InitFeatures::known(), &accept_channel);
9296
9297         let (temporary_channel_id, tx, _) = create_funding_transaction(&nodes[0], 1_000_000, 42);
9298
9299         if on_holder_tx {
9300                 if let Some(mut chan) = nodes[1].node.channel_state.lock().unwrap().by_id.get_mut(&temporary_channel_id) {
9301                         chan.holder_dust_limit_satoshis = 660;
9302                 }
9303         }
9304
9305         nodes[0].node.funding_transaction_generated(&temporary_channel_id, tx.clone()).unwrap();
9306         nodes[1].node.handle_funding_created(&nodes[0].node.get_our_node_id(), &get_event_msg!(nodes[0], MessageSendEvent::SendFundingCreated, nodes[1].node.get_our_node_id()));
9307         check_added_monitors!(nodes[1], 1);
9308
9309         nodes[0].node.handle_funding_signed(&nodes[1].node.get_our_node_id(), &get_event_msg!(nodes[1], MessageSendEvent::SendFundingSigned, nodes[0].node.get_our_node_id()));
9310         check_added_monitors!(nodes[0], 1);
9311
9312         let (funding_locked, _) = create_chan_between_nodes_with_value_confirm(&nodes[0], &nodes[1], &tx);
9313         let (announcement, as_update, bs_update) = create_chan_between_nodes_with_value_b(&nodes[0], &nodes[1], &funding_locked);
9314         update_nodes_with_chan_announce(&nodes, 0, 1, &announcement, &as_update, &bs_update);
9315
9316         if on_holder_tx {
9317                 if dust_outbound_balance {
9318                         for i in 0..2 {
9319                                 let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[1], nodes[0], 2_300_000);
9320                                 if let Err(_) = nodes[1].node.send_payment(&route, payment_hash, &Some(payment_secret)) { panic!("Unexpected event at dust HTLC {}", i); }
9321                         }
9322                 } else {
9323                         for _ in 0..2 {
9324                                 route_payment(&nodes[0], &[&nodes[1]], 2_300_000);
9325                         }
9326                 }
9327         } else {
9328                 if dust_outbound_balance {
9329                         for i in 0..25 {
9330                                 let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[1], nodes[0], 200_000); // + 177_000 msat of HTLC-success tx at 253 sats/kWU
9331                                 if let Err(_) = nodes[1].node.send_payment(&route, payment_hash, &Some(payment_secret)) { panic!("Unexpected event at dust HTLC {}", i); }
9332                         }
9333                 } else {
9334                         for _ in 0..25 {
9335                                 route_payment(&nodes[0], &[&nodes[1]], 200_000); // + 167_000 msat of HTLC-timeout tx at 253 sats/kWU
9336                         }
9337                 }
9338         }
9339
9340         if at_forward {
9341                 let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[1], nodes[0], if on_holder_tx { 2_300_000 } else { 200_000 });
9342                 let mut config = UserConfig::default();
9343                 if on_holder_tx {
9344                         unwrap_send_err!(nodes[1].node.send_payment(&route, payment_hash, &Some(payment_secret)), true, APIError::ChannelUnavailable { ref err }, assert_eq!(err, &format!("Cannot send value that would put our exposure to dust HTLCs at {} over the limit {} on holder commitment tx", 6_900_000, config.channel_options.max_dust_htlc_exposure_msat)));
9345                 } else {
9346                         unwrap_send_err!(nodes[1].node.send_payment(&route, payment_hash, &Some(payment_secret)), true, APIError::ChannelUnavailable { ref err }, assert_eq!(err, &format!("Cannot send value that would put our exposure to dust HTLCs at {} over the limit {} on counterparty commitment tx", 5_200_000, config.channel_options.max_dust_htlc_exposure_msat)));
9347                 }
9348         } else {
9349                 let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1 ], if on_holder_tx { 2_300_000 } else { 200_000 });
9350                 nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap();
9351                 check_added_monitors!(nodes[0], 1);
9352                 let mut events = nodes[0].node.get_and_clear_pending_msg_events();
9353                 assert_eq!(events.len(), 1);
9354                 let payment_event = SendEvent::from_event(events.remove(0));
9355                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
9356                 if on_holder_tx {
9357                         nodes[1].logger.assert_log("lightning::ln::channel".to_string(), format!("Cannot accept value that would put our exposure to dust HTLCs at {} over the limit {} on holder commitment tx", 6_900_000, config.channel_options.max_dust_htlc_exposure_msat), 1);
9358                 } else {
9359                         nodes[1].logger.assert_log("lightning::ln::channel".to_string(), format!("Cannot accept value that would put our exposure to dust HTLCs at {} over the limit {} on counterparty commitment tx", 5_200_000, config.channel_options.max_dust_htlc_exposure_msat), 1);
9360                 }
9361         }
9362
9363         let _ = nodes[1].node.get_and_clear_pending_msg_events();
9364         let mut added_monitors = nodes[1].chain_monitor.added_monitors.lock().unwrap();
9365         added_monitors.clear();
9366 }
9367
9368 #[test]
9369 fn test_max_dust_htlc_exposure() {
9370         do_test_max_dust_htlc_exposure(true, true, true);
9371         do_test_max_dust_htlc_exposure(false, true, true);
9372         do_test_max_dust_htlc_exposure(false, false, true);
9373         do_test_max_dust_htlc_exposure(false, false, false);
9374         do_test_max_dust_htlc_exposure(true, true, false);
9375         do_test_max_dust_htlc_exposure(true, false, false);
9376         do_test_max_dust_htlc_exposure(true, false, true);
9377         do_test_max_dust_htlc_exposure(false, true, false);
9378 }