git.bitcoin.ninja Git - rust-lightning/blob - lightning/src/ln/onion_route_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 of the onion error messages/codes which are returned when routing a payment fails.
  11 //! These tests work by standing up full nodes and route payments across the network, checking the
  12 //! returned errors decode to the correct thing.
  13
  14 use crate::chain::channelmonitor::{CLTV_CLAIM_BUFFER, LATENCY_GRACE_PERIOD_BLOCKS};
  15 use crate::chain::keysinterface::{EntropySource, NodeSigner, Recipient};
  16 use crate::events::{Event, HTLCDestination, MessageSendEvent, MessageSendEventsProvider, PathFailure, PaymentFailureReason};
  17 use crate::ln::{PaymentHash, PaymentSecret};
  18 use crate::ln::channel::EXPIRE_PREV_CONFIG_TICKS;
  19 use crate::ln::channelmanager::{HTLCForwardInfo, FailureCode, CLTV_FAR_FAR_AWAY, DISABLE_GOSSIP_TICKS, MIN_CLTV_EXPIRY_DELTA, PendingAddHTLCInfo, PendingHTLCInfo, PendingHTLCRouting, PaymentId, RecipientOnionFields};
  20 use crate::ln::onion_utils;
  21 use crate::routing::gossip::{NetworkUpdate, RoutingFees};
  22 use crate::routing::router::{get_route, PaymentParameters, Route, RouteHint, RouteHintHop};
  23 use crate::ln::features::{InitFeatures, InvoiceFeatures};
  24 use crate::ln::msgs;
  25 use crate::ln::msgs::{ChannelMessageHandler, ChannelUpdate};
  26 use crate::ln::wire::Encode;
  27 use crate::util::ser::{Writeable, Writer};
  28 use crate::util::test_utils;
  29 use crate::util::config::{UserConfig, ChannelConfig};
  30 use crate::util::errors::APIError;
  31
  32 use bitcoin::hash_types::BlockHash;
  33
  34 use bitcoin::hashes::Hash;
  35 use bitcoin::hashes::sha256::Hash as Sha256;
  36
  37 use bitcoin::secp256k1;
  38 use bitcoin::secp256k1::{Secp256k1, SecretKey};
  39
  40 use crate::io;
  41 use crate::prelude::*;
  42 use core::default::Default;
  43
  44 use crate::ln::functional_test_utils::*;
  45
  46 fn run_onion_failure_test<F1,F2>(_name: &str, test_case: u8, nodes: &Vec<Node>, route: &Route, payment_hash: &PaymentHash, payment_secret: &PaymentSecret, callback_msg: F1, callback_node: F2, expected_retryable: bool, expected_error_code: Option<u16>, expected_channel_update: Option<NetworkUpdate>, expected_short_channel_id: Option<u64>)
  47         where F1: for <'a> FnMut(&'a mut msgs::UpdateAddHTLC),
  48                                 F2: FnMut(),
  49 {
  50         run_onion_failure_test_with_fail_intercept(_name, test_case, nodes, route, payment_hash, payment_secret, callback_msg, |_|{}, callback_node, expected_retryable, expected_error_code, expected_channel_update, expected_short_channel_id);
  51 }
  52
  53 // test_case
  54 // 0: node1 fails backward
  55 // 1: final node fails backward
  56 // 2: payment completed but the user rejects the payment
  57 // 3: final node fails backward (but tamper onion payloads from node0)
  58 // 100: trigger error in the intermediate node and tamper returning fail_htlc
  59 // 200: trigger error in the final node and tamper returning fail_htlc
  60 fn run_onion_failure_test_with_fail_intercept<F1,F2,F3>(_name: &str, test_case: u8, nodes: &Vec<Node>, route: &Route, payment_hash: &PaymentHash, payment_secret: &PaymentSecret, mut callback_msg: F1, mut callback_fail: F2, mut callback_node: F3, expected_retryable: bool, expected_error_code: Option<u16>, expected_channel_update: Option<NetworkUpdate>, expected_short_channel_id: Option<u64>)
  61         where F1: for <'a> FnMut(&'a mut msgs::UpdateAddHTLC),
  62                                 F2: for <'a> FnMut(&'a mut msgs::UpdateFailHTLC),
  63                                 F3: FnMut(),
  64 {
  65         macro_rules! expect_event {
  66                 ($node: expr, $event_type: path) => {{
  67                         let events = $node.node.get_and_clear_pending_events();
  68                         assert_eq!(events.len(), 1);
  69                         match events[0] {
  70                                 $event_type { .. } => {},
  71                                 _ => panic!("Unexpected event"),
  72                         }
  73                 }}
  74         }
  75
  76         macro_rules! expect_htlc_forward {
  77                 ($node: expr) => {{
  78                         expect_event!($node, Event::PendingHTLCsForwardable);
  79                         $node.node.process_pending_htlc_forwards();
  80                 }}
  81         }
  82
  83         // 0 ~~> 2 send payment
  84         let payment_id = PaymentId(nodes[0].keys_manager.backing.get_secure_random_bytes());
  85         nodes[0].node.send_payment_with_route(&route, *payment_hash,
  86                 RecipientOnionFields::secret_only(*payment_secret), payment_id).unwrap();
  87         check_added_monitors!(nodes[0], 1);
  88         let update_0 = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
  89         // temper update_add (0 => 1)
  90         let mut update_add_0 = update_0.update_add_htlcs[0].clone();
  91         if test_case == 0 || test_case == 3 || test_case == 100 {
  92                 callback_msg(&mut update_add_0);
  93                 callback_node();
  94         }
  95         // 0 => 1 update_add & CS
  96         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &update_add_0);
  97         commitment_signed_dance!(nodes[1], nodes[0], &update_0.commitment_signed, false, true);
  98
  99         let update_1_0 = match test_case {
 100                 0|100 => { // intermediate node failure; fail backward to 0
 101                         let update_1_0 = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
 102                         assert!(update_1_0.update_fail_htlcs.len()+update_1_0.update_fail_malformed_htlcs.len()==1 && (update_1_0.update_fail_htlcs.len()==1 || update_1_0.update_fail_malformed_htlcs.len()==1));
 103                         update_1_0
 104                 },
 105                 1|2|3|200 => { // final node failure; forwarding to 2
 106                         assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
 107                         // forwarding on 1
 108                         if test_case != 200 {
 109                                 callback_node();
 110                         }
 111                         expect_htlc_forward!(&nodes[1]);
 112
 113                         let update_1 = get_htlc_update_msgs!(nodes[1], nodes[2].node.get_our_node_id());
 114                         check_added_monitors!(&nodes[1], 1);
 115                         assert_eq!(update_1.update_add_htlcs.len(), 1);
 116                         // tamper update_add (1 => 2)
 117                         let mut update_add_1 = update_1.update_add_htlcs[0].clone();
 118                         if test_case != 3 && test_case != 200 {
 119                                 callback_msg(&mut update_add_1);
 120                         }
 121
 122                         // 1 => 2
 123                         nodes[2].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &update_add_1);
 124                         commitment_signed_dance!(nodes[2], nodes[1], update_1.commitment_signed, false, true);
 125
 126                         if test_case == 2 || test_case == 200 {
 127                                 expect_htlc_forward!(&nodes[2]);
 128                                 expect_event!(&nodes[2], Event::PaymentClaimable);
 129                                 callback_node();
 130                                 expect_pending_htlcs_forwardable_and_htlc_handling_failed!(nodes[2], vec![HTLCDestination::FailedPayment { payment_hash: payment_hash.clone() }]);
 131                         }
 132
 133                         let update_2_1 = get_htlc_update_msgs!(nodes[2], nodes[1].node.get_our_node_id());
 134                         if test_case == 2 || test_case == 200 {
 135                                 check_added_monitors!(&nodes[2], 1);
 136                         }
 137                         assert!(update_2_1.update_fail_htlcs.len() == 1);
 138
 139                         let mut fail_msg = update_2_1.update_fail_htlcs[0].clone();
 140                         if test_case == 200 {
 141                                 callback_fail(&mut fail_msg);
 142                         }
 143
 144                         // 2 => 1
 145                         nodes[1].node.handle_update_fail_htlc(&nodes[2].node.get_our_node_id(), &fail_msg);
 146                         commitment_signed_dance!(nodes[1], nodes[2], update_2_1.commitment_signed, true);
 147
 148                         // backward fail on 1
 149                         let update_1_0 = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
 150                         assert!(update_1_0.update_fail_htlcs.len() == 1);
 151                         update_1_0
 152                 },
 153                 _ => unreachable!(),
 154         };
 155
 156         // 1 => 0 commitment_signed_dance
 157         if update_1_0.update_fail_htlcs.len() > 0 {
 158                 let mut fail_msg = update_1_0.update_fail_htlcs[0].clone();
 159                 if test_case == 100 {
 160                         callback_fail(&mut fail_msg);
 161                 }
 162                 nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &fail_msg);
 163         } else {
 164                 nodes[0].node.handle_update_fail_malformed_htlc(&nodes[1].node.get_our_node_id(), &update_1_0.update_fail_malformed_htlcs[0]);
 165         };
 166
 167         commitment_signed_dance!(nodes[0], nodes[1], update_1_0.commitment_signed, false, true);
 168
 169         let events = nodes[0].node.get_and_clear_pending_events();
 170         assert_eq!(events.len(), 2);
 171         if let &Event::PaymentPathFailed { ref payment_failed_permanently, ref short_channel_id, ref error_code, failure: PathFailure::OnPath { ref network_update }, .. } = &events[0] {
 172                 assert_eq!(*payment_failed_permanently, !expected_retryable);
 173                 assert_eq!(*error_code, expected_error_code);
 174                 if expected_channel_update.is_some() {
 175                         match network_update {
 176                                 Some(update) => match update {
 177                                         &NetworkUpdate::ChannelUpdateMessage { .. } => {
 178                                                 if let NetworkUpdate::ChannelUpdateMessage { .. } = expected_channel_update.unwrap() {} else {
 179                                                         panic!("channel_update not found!");
 180                                                 }
 181                                         },
 182                                         &NetworkUpdate::ChannelFailure { ref short_channel_id, ref is_permanent } => {
 183                                                 if let NetworkUpdate::ChannelFailure { short_channel_id: ref expected_short_channel_id, is_permanent: ref expected_is_permanent } = expected_channel_update.unwrap() {
 184                                                         assert!(*short_channel_id == *expected_short_channel_id);
 185                                                         assert!(*is_permanent == *expected_is_permanent);
 186                                                 } else {
 187                                                         panic!("Unexpected message event");
 188                                                 }
 189                                         },
 190                                         &NetworkUpdate::NodeFailure { ref node_id, ref is_permanent } => {
 191                                                 if let NetworkUpdate::NodeFailure { node_id: ref expected_node_id, is_permanent: ref expected_is_permanent } = expected_channel_update.unwrap() {
 192                                                         assert!(*node_id == *expected_node_id);
 193                                                         assert!(*is_permanent == *expected_is_permanent);
 194                                                 } else {
 195                                                         panic!("Unexpected message event");
 196                                                 }
 197                                         },
 198                                 }
 199                                 None => panic!("Expected channel update"),
 200                         }
 201                 } else {
 202                         assert!(network_update.is_none());
 203                 }
 204                 if let Some(expected_short_channel_id) = expected_short_channel_id {
 205                         match short_channel_id {
 206                                 Some(short_channel_id) => assert_eq!(*short_channel_id, expected_short_channel_id),
 207                                 None => panic!("Expected short channel id"),
 208                         }
 209                 } else {
 210                         assert!(short_channel_id.is_none());
 211                 }
 212         } else {
 213                 panic!("Unexpected event");
 214         }
 215         match events[1] {
 216                 Event::PaymentFailed { payment_hash: ev_payment_hash, payment_id: ev_payment_id, reason: ref ev_reason } => {
 217                         assert_eq!(*payment_hash, ev_payment_hash);
 218                         assert_eq!(payment_id, ev_payment_id);
 219                         assert_eq!(if expected_retryable {
 220                                 PaymentFailureReason::RetriesExhausted
 221                         } else {
 222                                 PaymentFailureReason::RecipientRejected
 223                         }, ev_reason.unwrap());
 224                 }
 225                 _ => panic!("Unexpected second event"),
 226         }
 227 }
 228
 229 impl msgs::ChannelUpdate {
 230         fn dummy(short_channel_id: u64) -> msgs::ChannelUpdate {
 231                 use bitcoin::secp256k1::ffi::Signature as FFISignature;
 232                 use bitcoin::secp256k1::ecdsa::Signature;
 233                 msgs::ChannelUpdate {
 234                         signature: Signature::from(unsafe { FFISignature::new() }),
 235                         contents: msgs::UnsignedChannelUpdate {
 236                                 chain_hash: BlockHash::hash(&vec![0u8][..]),
 237                                 short_channel_id,
 238                                 timestamp: 0,
 239                                 flags: 0,
 240                                 cltv_expiry_delta: 0,
 241                                 htlc_minimum_msat: 0,
 242                                 htlc_maximum_msat: msgs::MAX_VALUE_MSAT,
 243                                 fee_base_msat: 0,
 244                                 fee_proportional_millionths: 0,
 245                                 excess_data: vec![],
 246                         }
 247                 }
 248         }
 249 }
 250
 251 struct BogusOnionHopData {
 252         data: Vec<u8>
 253 }
 254 impl BogusOnionHopData {
 255         fn new(orig: msgs::OnionHopData) -> Self {
 256                 Self { data: orig.encode() }
 257         }
 258 }
 259 impl Writeable for BogusOnionHopData {
 260         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 261                 writer.write_all(&self.data[..])
 262         }
 263 }
 264
 265 const BADONION: u16 = 0x8000;
 266 const PERM: u16 = 0x4000;
 267 const NODE: u16 = 0x2000;
 268 const UPDATE: u16 = 0x1000;
 269
 270 #[test]
 271 fn test_fee_failures() {
 272         // Tests that the fee required when forwarding remains consistent over time. This was
 273         // previously broken, with forwarding fees floating based on the fee estimator at the time of
 274         // forwarding.
 275         //
 276         // When this test was written, the default base fee floated based on the HTLC count.
 277         // It is now fixed, so we simply set the fee to the expected value here.
 278         let mut config = test_default_channel_config();
 279         config.channel_config.forwarding_fee_base_msat = 196;
 280
 281         let chanmon_cfgs = create_chanmon_cfgs(3);
 282         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
 283         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[Some(config), Some(config), Some(config)]);
 284         let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs);
 285         let channels = [create_announced_chan_between_nodes(&nodes, 0, 1), create_announced_chan_between_nodes(&nodes, 1, 2)];
 286
 287         // positive case
 288         let (route, payment_hash_success, payment_preimage_success, payment_secret_success) = get_route_and_payment_hash!(nodes[0], nodes[2], 40_000);
 289         nodes[0].node.send_payment_with_route(&route, payment_hash_success,
 290                 RecipientOnionFields::secret_only(payment_secret_success), PaymentId(payment_hash_success.0)).unwrap();
 291         check_added_monitors!(nodes[0], 1);
 292         pass_along_route(&nodes[0], &[&[&nodes[1], &nodes[2]]], 40_000, payment_hash_success, payment_secret_success);
 293         claim_payment(&nodes[0], &[&nodes[1], &nodes[2]], payment_preimage_success);
 294
 295         // If the hop gives fee_insufficient but enough fees were provided, then the previous hop
 296         // malleated the payment before forwarding, taking funds when they shouldn't have.
 297         let (_, payment_hash, payment_secret) = get_payment_preimage_hash!(nodes[2]);
 298         let short_channel_id = channels[0].0.contents.short_channel_id;
 299         run_onion_failure_test("fee_insufficient", 0, &nodes, &route, &payment_hash, &payment_secret, |msg| {
 300                 msg.amount_msat -= 1;
 301         }, || {}, true, Some(UPDATE|12), Some(NetworkUpdate::ChannelFailure { short_channel_id, is_permanent: true}), Some(short_channel_id));
 302
 303         // In an earlier version, we spuriously failed to forward payments if the expected feerate
 304         // changed between the channel open and the payment.
 305         {
 306                 let mut feerate_lock = chanmon_cfgs[1].fee_estimator.sat_per_kw.lock().unwrap();
 307                 *feerate_lock *= 2;
 308         }
 309
 310         let (payment_preimage_success, payment_hash_success, payment_secret_success) = get_payment_preimage_hash!(nodes[2]);
 311         nodes[0].node.send_payment_with_route(&route, payment_hash_success,
 312                 RecipientOnionFields::secret_only(payment_secret_success), PaymentId(payment_hash_success.0)).unwrap();
 313         check_added_monitors!(nodes[0], 1);
 314         pass_along_route(&nodes[0], &[&[&nodes[1], &nodes[2]]], 40_000, payment_hash_success, payment_secret_success);
 315         claim_payment(&nodes[0], &[&nodes[1], &nodes[2]], payment_preimage_success);
 316 }
 317
 318 #[test]
 319 fn test_onion_failure() {
 320         // When we check for amount_below_minimum below, we want to test that we're using the *right*
 321         // amount, thus we need different htlc_minimum_msat values. We set node[2]'s htlc_minimum_msat
 322         // to 2000, which is above the default value of 1000 set in create_node_chanmgrs.
 323         // This exposed a previous bug because we were using the wrong value all the way down in
 324         // Channel::get_counterparty_htlc_minimum_msat().
 325         let mut node_2_cfg: UserConfig = Default::default();
 326         node_2_cfg.channel_handshake_config.our_htlc_minimum_msat = 2000;
 327         node_2_cfg.channel_handshake_config.announced_channel = true;
 328         node_2_cfg.channel_handshake_limits.force_announced_channel_preference = false;
 329
 330         // When this test was written, the default base fee floated based on the HTLC count.
 331         // It is now fixed, so we simply set the fee to the expected value here.
 332         let mut config = test_default_channel_config();
 333         config.channel_config.forwarding_fee_base_msat = 196;
 334
 335         let chanmon_cfgs = create_chanmon_cfgs(3);
 336         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
 337         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[Some(config), Some(config), Some(node_2_cfg)]);
 338         let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs);
 339         let channels = [create_announced_chan_between_nodes(&nodes, 0, 1), create_announced_chan_between_nodes(&nodes, 1, 2)];
 340         for node in nodes.iter() {
 341                 *node.keys_manager.override_random_bytes.lock().unwrap() = Some([3; 32]);
 342         }
 343         let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[2], 40000);
 344         // positive case
 345         send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 40000);
 346
 347         // intermediate node failure
 348         let short_channel_id = channels[1].0.contents.short_channel_id;
 349         run_onion_failure_test("invalid_realm", 0, &nodes, &route, &payment_hash, &payment_secret, |msg| {
 350                 let session_priv = SecretKey::from_slice(&[3; 32]).unwrap();
 351                 let cur_height = nodes[0].best_block_info().1 + 1;
 352                 let onion_keys = onion_utils::construct_onion_keys(&Secp256k1::new(), &route.paths[0], &session_priv).unwrap();
 353                 let (mut onion_payloads, _htlc_msat, _htlc_cltv) = onion_utils::build_onion_payloads(
 354                         &route.paths[0], 40000, RecipientOnionFields::spontaneous_empty(), cur_height, &None).unwrap();
 355                 let mut new_payloads = Vec::new();
 356                 for payload in onion_payloads.drain(..) {
 357                         new_payloads.push(BogusOnionHopData::new(payload));
 358                 }
 359                 // break the first (non-final) hop payload by swapping the realm (0) byte for a byte
 360                 // describing a length-1 TLV payload, which is obviously bogus.
 361                 new_payloads[0].data[0] = 1;
 362                 msg.onion_routing_packet = onion_utils::construct_onion_packet_with_writable_hopdata(new_payloads, onion_keys, [0; 32], &payment_hash);
 363         }, ||{}, true, Some(PERM|22), Some(NetworkUpdate::ChannelFailure{short_channel_id, is_permanent: true}), Some(short_channel_id));
 364
 365         // final node failure
 366         let short_channel_id = channels[1].0.contents.short_channel_id;
 367         run_onion_failure_test("invalid_realm", 3, &nodes, &route, &payment_hash, &payment_secret, |msg| {
 368                 let session_priv = SecretKey::from_slice(&[3; 32]).unwrap();
 369                 let cur_height = nodes[0].best_block_info().1 + 1;
 370                 let onion_keys = onion_utils::construct_onion_keys(&Secp256k1::new(), &route.paths[0], &session_priv).unwrap();
 371                 let (mut onion_payloads, _htlc_msat, _htlc_cltv) = onion_utils::build_onion_payloads(
 372                         &route.paths[0], 40000, RecipientOnionFields::spontaneous_empty(), cur_height, &None).unwrap();
 373                 let mut new_payloads = Vec::new();
 374                 for payload in onion_payloads.drain(..) {
 375                         new_payloads.push(BogusOnionHopData::new(payload));
 376                 }
 377                 // break the last-hop payload by swapping the realm (0) byte for a byte describing a
 378                 // length-1 TLV payload, which is obviously bogus.
 379                 new_payloads[1].data[0] = 1;
 380                 msg.onion_routing_packet = onion_utils::construct_onion_packet_with_writable_hopdata(new_payloads, onion_keys, [0; 32], &payment_hash);
 381         }, ||{}, false, Some(PERM|22), Some(NetworkUpdate::ChannelFailure{short_channel_id, is_permanent: true}), Some(short_channel_id));
 382
 383         // the following three with run_onion_failure_test_with_fail_intercept() test only the origin node
 384         // receiving simulated fail messages
 385         // intermediate node failure
 386         run_onion_failure_test_with_fail_intercept("temporary_node_failure", 100, &nodes, &route, &payment_hash, &payment_secret, |msg| {
 387                 // trigger error
 388                 msg.amount_msat -= 1;
 389         }, |msg| {
 390                 // and tamper returning error message
 391                 let session_priv = SecretKey::from_slice(&[3; 32]).unwrap();
 392                 let onion_keys = onion_utils::construct_onion_keys(&Secp256k1::new(), &route.paths[0], &session_priv).unwrap();
 393                 msg.reason = onion_utils::build_first_hop_failure_packet(onion_keys[0].shared_secret.as_ref(), NODE|2, &[0;0]);
 394         }, ||{}, true, Some(NODE|2), Some(NetworkUpdate::NodeFailure{node_id: route.paths[0].hops[0].pubkey, is_permanent: false}), Some(route.paths[0].hops[0].short_channel_id));
 395
 396         // final node failure
 397         run_onion_failure_test_with_fail_intercept("temporary_node_failure", 200, &nodes, &route, &payment_hash, &payment_secret, |_msg| {}, |msg| {
 398                 // and tamper returning error message
 399                 let session_priv = SecretKey::from_slice(&[3; 32]).unwrap();
 400                 let onion_keys = onion_utils::construct_onion_keys(&Secp256k1::new(), &route.paths[0], &session_priv).unwrap();
 401                 msg.reason = onion_utils::build_first_hop_failure_packet(onion_keys[1].shared_secret.as_ref(), NODE|2, &[0;0]);
 402         }, ||{
 403                 nodes[2].node.fail_htlc_backwards(&payment_hash);
 404         }, true, Some(NODE|2), Some(NetworkUpdate::NodeFailure{node_id: route.paths[0].hops[1].pubkey, is_permanent: false}), Some(route.paths[0].hops[1].short_channel_id));
 405         let (_, payment_hash, payment_secret) = get_payment_preimage_hash!(nodes[2]);
 406
 407         // intermediate node failure
 408         run_onion_failure_test_with_fail_intercept("permanent_node_failure", 100, &nodes, &route, &payment_hash, &payment_secret, |msg| {
 409                 msg.amount_msat -= 1;
 410         }, |msg| {
 411                 let session_priv = SecretKey::from_slice(&[3; 32]).unwrap();
 412                 let onion_keys = onion_utils::construct_onion_keys(&Secp256k1::new(), &route.paths[0], &session_priv).unwrap();
 413                 msg.reason = onion_utils::build_first_hop_failure_packet(onion_keys[0].shared_secret.as_ref(), PERM|NODE|2, &[0;0]);
 414         }, ||{}, true, Some(PERM|NODE|2), Some(NetworkUpdate::NodeFailure{node_id: route.paths[0].hops[0].pubkey, is_permanent: true}), Some(route.paths[0].hops[0].short_channel_id));
 415
 416         // final node failure
 417         run_onion_failure_test_with_fail_intercept("permanent_node_failure", 200, &nodes, &route, &payment_hash, &payment_secret, |_msg| {}, |msg| {
 418                 let session_priv = SecretKey::from_slice(&[3; 32]).unwrap();
 419                 let onion_keys = onion_utils::construct_onion_keys(&Secp256k1::new(), &route.paths[0], &session_priv).unwrap();
 420                 msg.reason = onion_utils::build_first_hop_failure_packet(onion_keys[1].shared_secret.as_ref(), PERM|NODE|2, &[0;0]);
 421         }, ||{
 422                 nodes[2].node.fail_htlc_backwards(&payment_hash);
 423         }, false, Some(PERM|NODE|2), Some(NetworkUpdate::NodeFailure{node_id: route.paths[0].hops[1].pubkey, is_permanent: true}), Some(route.paths[0].hops[1].short_channel_id));
 424         let (_, payment_hash, payment_secret) = get_payment_preimage_hash!(nodes[2]);
 425
 426         // intermediate node failure
 427         run_onion_failure_test_with_fail_intercept("required_node_feature_missing", 100, &nodes, &route, &payment_hash, &payment_secret, |msg| {
 428                 msg.amount_msat -= 1;
 429         }, |msg| {
 430                 let session_priv = SecretKey::from_slice(&[3; 32]).unwrap();
 431                 let onion_keys = onion_utils::construct_onion_keys(&Secp256k1::new(), &route.paths[0], &session_priv).unwrap();
 432                 msg.reason = onion_utils::build_first_hop_failure_packet(onion_keys[0].shared_secret.as_ref(), PERM|NODE|3, &[0;0]);
 433         }, ||{
 434                 nodes[2].node.fail_htlc_backwards(&payment_hash);
 435         }, true, Some(PERM|NODE|3), Some(NetworkUpdate::NodeFailure{node_id: route.paths[0].hops[0].pubkey, is_permanent: true}), Some(route.paths[0].hops[0].short_channel_id));
 436
 437         // final node failure
 438         run_onion_failure_test_with_fail_intercept("required_node_feature_missing", 200, &nodes, &route, &payment_hash, &payment_secret, |_msg| {}, |msg| {
 439                 let session_priv = SecretKey::from_slice(&[3; 32]).unwrap();
 440                 let onion_keys = onion_utils::construct_onion_keys(&Secp256k1::new(), &route.paths[0], &session_priv).unwrap();
 441                 msg.reason = onion_utils::build_first_hop_failure_packet(onion_keys[1].shared_secret.as_ref(), PERM|NODE|3, &[0;0]);
 442         }, ||{
 443                 nodes[2].node.fail_htlc_backwards(&payment_hash);
 444         }, false, Some(PERM|NODE|3), Some(NetworkUpdate::NodeFailure{node_id: route.paths[0].hops[1].pubkey, is_permanent: true}), Some(route.paths[0].hops[1].short_channel_id));
 445         let (_, payment_hash, payment_secret) = get_payment_preimage_hash!(nodes[2]);
 446
 447         // Our immediate peer sent UpdateFailMalformedHTLC because it couldn't understand the onion in
 448         // the UpdateAddHTLC that we sent.
 449         let short_channel_id = channels[0].0.contents.short_channel_id;
 450         run_onion_failure_test("invalid_onion_version", 0, &nodes, &route, &payment_hash, &payment_secret, |msg| { msg.onion_routing_packet.version = 1; }, ||{}, true,
 451                 Some(BADONION|PERM|4), None, Some(short_channel_id));
 452
 453         run_onion_failure_test("invalid_onion_hmac", 0, &nodes, &route, &payment_hash, &payment_secret, |msg| { msg.onion_routing_packet.hmac = [3; 32]; }, ||{}, true,
 454                 Some(BADONION|PERM|5), None, Some(short_channel_id));
 455
 456         run_onion_failure_test("invalid_onion_key", 0, &nodes, &route, &payment_hash, &payment_secret, |msg| { msg.onion_routing_packet.public_key = Err(secp256k1::Error::InvalidPublicKey);}, ||{}, true,
 457                 Some(BADONION|PERM|6), None, Some(short_channel_id));
 458
 459         let short_channel_id = channels[1].0.contents.short_channel_id;
 460         let chan_update = ChannelUpdate::dummy(short_channel_id);
 461
 462         let mut err_data = Vec::new();
 463         err_data.extend_from_slice(&(chan_update.serialized_length() as u16 + 2).to_be_bytes());
 464         err_data.extend_from_slice(&ChannelUpdate::TYPE.to_be_bytes());
 465         err_data.extend_from_slice(&chan_update.encode());
 466         run_onion_failure_test_with_fail_intercept("temporary_channel_failure", 100, &nodes, &route, &payment_hash, &payment_secret, |msg| {
 467                 msg.amount_msat -= 1;
 468         }, |msg| {
 469                 let session_priv = SecretKey::from_slice(&[3; 32]).unwrap();
 470                 let onion_keys = onion_utils::construct_onion_keys(&Secp256k1::new(), &route.paths[0], &session_priv).unwrap();
 471                 msg.reason = onion_utils::build_first_hop_failure_packet(onion_keys[0].shared_secret.as_ref(), UPDATE|7, &err_data);
 472         }, ||{}, true, Some(UPDATE|7), Some(NetworkUpdate::ChannelUpdateMessage{msg: chan_update.clone()}), Some(short_channel_id));
 473
 474         // Check we can still handle onion failures that include channel updates without a type prefix
 475         let err_data_without_type = chan_update.encode_with_len();
 476         run_onion_failure_test_with_fail_intercept("temporary_channel_failure", 100, &nodes, &route, &payment_hash, &payment_secret, |msg| {
 477                 msg.amount_msat -= 1;
 478         }, |msg| {
 479                 let session_priv = SecretKey::from_slice(&[3; 32]).unwrap();
 480                 let onion_keys = onion_utils::construct_onion_keys(&Secp256k1::new(), &route.paths[0], &session_priv).unwrap();
 481                 msg.reason = onion_utils::build_first_hop_failure_packet(onion_keys[0].shared_secret.as_ref(), UPDATE|7, &err_data_without_type);
 482         }, ||{}, true, Some(UPDATE|7), Some(NetworkUpdate::ChannelUpdateMessage{msg: chan_update}), Some(short_channel_id));
 483
 484         let short_channel_id = channels[1].0.contents.short_channel_id;
 485         run_onion_failure_test_with_fail_intercept("permanent_channel_failure", 100, &nodes, &route, &payment_hash, &payment_secret, |msg| {
 486                 msg.amount_msat -= 1;
 487         }, |msg| {
 488                 let session_priv = SecretKey::from_slice(&[3; 32]).unwrap();
 489                 let onion_keys = onion_utils::construct_onion_keys(&Secp256k1::new(), &route.paths[0], &session_priv).unwrap();
 490                 msg.reason = onion_utils::build_first_hop_failure_packet(onion_keys[0].shared_secret.as_ref(), PERM|8, &[0;0]);
 491                 // short_channel_id from the processing node
 492         }, ||{}, true, Some(PERM|8), Some(NetworkUpdate::ChannelFailure{short_channel_id, is_permanent: true}), Some(short_channel_id));
 493
 494         let short_channel_id = channels[1].0.contents.short_channel_id;
 495         run_onion_failure_test_with_fail_intercept("required_channel_feature_missing", 100, &nodes, &route, &payment_hash, &payment_secret, |msg| {
 496                 msg.amount_msat -= 1;
 497         }, |msg| {
 498                 let session_priv = SecretKey::from_slice(&[3; 32]).unwrap();
 499                 let onion_keys = onion_utils::construct_onion_keys(&Secp256k1::new(), &route.paths[0], &session_priv).unwrap();
 500                 msg.reason = onion_utils::build_first_hop_failure_packet(onion_keys[0].shared_secret.as_ref(), PERM|9, &[0;0]);
 501                 // short_channel_id from the processing node
 502         }, ||{}, true, Some(PERM|9), Some(NetworkUpdate::ChannelFailure{short_channel_id, is_permanent: true}), Some(short_channel_id));
 503
 504         let mut bogus_route = route.clone();
 505         bogus_route.paths[0].hops[1].short_channel_id -= 1;
 506         let short_channel_id = bogus_route.paths[0].hops[1].short_channel_id;
 507         run_onion_failure_test("unknown_next_peer", 0, &nodes, &bogus_route, &payment_hash, &payment_secret, |_| {}, ||{}, true, Some(PERM|10),
 508           Some(NetworkUpdate::ChannelFailure{short_channel_id, is_permanent:true}), Some(short_channel_id));
 509
 510         let short_channel_id = channels[1].0.contents.short_channel_id;
 511         let amt_to_forward = nodes[1].node.per_peer_state.read().unwrap().get(&nodes[2].node.get_our_node_id())
 512                 .unwrap().lock().unwrap().channel_by_id.get(&channels[1].2).unwrap()
 513                 .get_counterparty_htlc_minimum_msat() - 1;
 514         let mut bogus_route = route.clone();
 515         let route_len = bogus_route.paths[0].hops.len();
 516         bogus_route.paths[0].hops[route_len-1].fee_msat = amt_to_forward;
 517         run_onion_failure_test("amount_below_minimum", 0, &nodes, &bogus_route, &payment_hash, &payment_secret, |_| {}, ||{}, true, Some(UPDATE|11), Some(NetworkUpdate::ChannelUpdateMessage{msg: ChannelUpdate::dummy(short_channel_id)}), Some(short_channel_id));
 518
 519         // Clear pending payments so that the following positive test has the correct payment hash.
 520         for node in nodes.iter() {
 521                 node.node.clear_pending_payments();
 522         }
 523
 524         // Test a positive test-case with one extra msat, meeting the minimum.
 525         bogus_route.paths[0].hops[route_len-1].fee_msat = amt_to_forward + 1;
 526         let preimage = send_along_route(&nodes[0], bogus_route, &[&nodes[1], &nodes[2]], amt_to_forward+1).0;
 527         claim_payment(&nodes[0], &[&nodes[1], &nodes[2]], preimage);
 528
 529         let short_channel_id = channels[0].0.contents.short_channel_id;
 530         run_onion_failure_test("fee_insufficient", 0, &nodes, &route, &payment_hash, &payment_secret, |msg| {
 531                 msg.amount_msat -= 1;
 532         }, || {}, true, Some(UPDATE|12), Some(NetworkUpdate::ChannelFailure { short_channel_id, is_permanent: true}), Some(short_channel_id));
 533
 534         let short_channel_id = channels[0].0.contents.short_channel_id;
 535         run_onion_failure_test("incorrect_cltv_expiry", 0, &nodes, &route, &payment_hash, &payment_secret, |msg| {
 536                 // need to violate: cltv_expiry - cltv_expiry_delta >= outgoing_cltv_value
 537                 msg.cltv_expiry -= 1;
 538         }, || {}, true, Some(UPDATE|13), Some(NetworkUpdate::ChannelFailure { short_channel_id, is_permanent: true}), Some(short_channel_id));
 539
 540         let short_channel_id = channels[1].0.contents.short_channel_id;
 541         run_onion_failure_test("expiry_too_soon", 0, &nodes, &route, &payment_hash, &payment_secret, |msg| {
 542                 let height = msg.cltv_expiry - CLTV_CLAIM_BUFFER - LATENCY_GRACE_PERIOD_BLOCKS + 1;
 543                 connect_blocks(&nodes[0], height - nodes[0].best_block_info().1);
 544                 connect_blocks(&nodes[1], height - nodes[1].best_block_info().1);
 545                 connect_blocks(&nodes[2], height - nodes[2].best_block_info().1);
 546         }, ||{}, true, Some(UPDATE|14), Some(NetworkUpdate::ChannelUpdateMessage{msg: ChannelUpdate::dummy(short_channel_id)}), Some(short_channel_id));
 547
 548         run_onion_failure_test("unknown_payment_hash", 2, &nodes, &route, &payment_hash, &payment_secret, |_| {}, || {
 549                 nodes[2].node.fail_htlc_backwards(&payment_hash);
 550         }, false, Some(PERM|15), None, None);
 551         let (_, payment_hash, payment_secret) = get_payment_preimage_hash!(nodes[2]);
 552
 553         run_onion_failure_test("final_expiry_too_soon", 1, &nodes, &route, &payment_hash, &payment_secret, |msg| {
 554                 let height = msg.cltv_expiry - CLTV_CLAIM_BUFFER - LATENCY_GRACE_PERIOD_BLOCKS + 1;
 555                 connect_blocks(&nodes[0], height - nodes[0].best_block_info().1);
 556                 connect_blocks(&nodes[1], height - nodes[1].best_block_info().1);
 557                 connect_blocks(&nodes[2], height - nodes[2].best_block_info().1);
 558         }, || {}, false, Some(0x4000 | 15), None, None);
 559
 560         run_onion_failure_test("final_incorrect_cltv_expiry", 1, &nodes, &route, &payment_hash, &payment_secret, |_| {}, || {
 561                 for (_, pending_forwards) in nodes[1].node.forward_htlcs.lock().unwrap().iter_mut() {
 562                         for f in pending_forwards.iter_mut() {
 563                                 match f {
 564                                         &mut HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo { ref mut forward_info, .. }) =>
 565                                                 forward_info.outgoing_cltv_value -= 1,
 566                                         _ => {},
 567                                 }
 568                         }
 569                 }
 570         }, true, Some(18), None, Some(channels[1].0.contents.short_channel_id));
 571
 572         run_onion_failure_test("final_incorrect_htlc_amount", 1, &nodes, &route, &payment_hash, &payment_secret, |_| {}, || {
 573                 // violate amt_to_forward > msg.amount_msat
 574                 for (_, pending_forwards) in nodes[1].node.forward_htlcs.lock().unwrap().iter_mut() {
 575                         for f in pending_forwards.iter_mut() {
 576                                 match f {
 577                                         &mut HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo { ref mut forward_info, .. }) =>
 578                                                 forward_info.outgoing_amt_msat -= 1,
 579                                         _ => {},
 580                                 }
 581                         }
 582                 }
 583         }, true, Some(19), None, Some(channels[1].0.contents.short_channel_id));
 584
 585         let short_channel_id = channels[1].0.contents.short_channel_id;
 586         run_onion_failure_test("channel_disabled", 0, &nodes, &route, &payment_hash, &payment_secret, |_| {}, || {
 587                 // disconnect event to the channel between nodes[1] ~ nodes[2]
 588                 nodes[1].node.peer_disconnected(&nodes[2].node.get_our_node_id());
 589                 nodes[2].node.peer_disconnected(&nodes[1].node.get_our_node_id());
 590         }, true, Some(UPDATE|7), Some(NetworkUpdate::ChannelUpdateMessage{msg: ChannelUpdate::dummy(short_channel_id)}), Some(short_channel_id));
 591         run_onion_failure_test("channel_disabled", 0, &nodes, &route, &payment_hash, &payment_secret, |_| {}, || {
 592                 // disconnect event to the channel between nodes[1] ~ nodes[2]
 593                 for _ in 0..DISABLE_GOSSIP_TICKS + 1 {
 594                         nodes[1].node.timer_tick_occurred();
 595                         nodes[2].node.timer_tick_occurred();
 596                 }
 597                 nodes[1].node.get_and_clear_pending_msg_events();
 598                 nodes[2].node.get_and_clear_pending_msg_events();
 599         }, true, Some(UPDATE|20), Some(NetworkUpdate::ChannelUpdateMessage{msg: ChannelUpdate::dummy(short_channel_id)}), Some(short_channel_id));
 600         reconnect_nodes(&nodes[1], &nodes[2], (false, false), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
 601
 602         run_onion_failure_test("expiry_too_far", 0, &nodes, &route, &payment_hash, &payment_secret, |msg| {
 603                 let session_priv = SecretKey::from_slice(&[3; 32]).unwrap();
 604                 let mut route = route.clone();
 605                 let height = nodes[2].best_block_info().1;
 606                 route.paths[0].hops[1].cltv_expiry_delta += CLTV_FAR_FAR_AWAY + route.paths[0].hops[0].cltv_expiry_delta + 1;
 607                 let onion_keys = onion_utils::construct_onion_keys(&Secp256k1::new(), &route.paths[0], &session_priv).unwrap();
 608                 let (onion_payloads, _, htlc_cltv) = onion_utils::build_onion_payloads(
 609                         &route.paths[0], 40000, RecipientOnionFields::spontaneous_empty(), height, &None).unwrap();
 610                 let onion_packet = onion_utils::construct_onion_packet(onion_payloads, onion_keys, [0; 32], &payment_hash);
 611                 msg.cltv_expiry = htlc_cltv;
 612                 msg.onion_routing_packet = onion_packet;
 613         }, ||{}, true, Some(21), Some(NetworkUpdate::NodeFailure{node_id: route.paths[0].hops[0].pubkey, is_permanent: true}), Some(route.paths[0].hops[0].short_channel_id));
 614
 615         run_onion_failure_test_with_fail_intercept("mpp_timeout", 200, &nodes, &route, &payment_hash, &payment_secret, |_msg| {}, |msg| {
 616                 // Tamper returning error message
 617                 let session_priv = SecretKey::from_slice(&[3; 32]).unwrap();
 618                 let onion_keys = onion_utils::construct_onion_keys(&Secp256k1::new(), &route.paths[0], &session_priv).unwrap();
 619                 msg.reason = onion_utils::build_first_hop_failure_packet(onion_keys[1].shared_secret.as_ref(), 23, &[0;0]);
 620         }, ||{
 621                 nodes[2].node.fail_htlc_backwards(&payment_hash);
 622         }, true, Some(23), None, None);
 623 }
 624
 625 #[test]
 626 fn test_overshoot_final_cltv() {
 627         let chanmon_cfgs = create_chanmon_cfgs(3);
 628         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
 629         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None; 3]);
 630         let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs);
 631         create_announced_chan_between_nodes(&nodes, 0, 1);
 632         create_announced_chan_between_nodes(&nodes, 1, 2);
 633         let (route, payment_hash, payment_preimage, payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[2], 40000);
 634
 635         let payment_id = PaymentId(nodes[0].keys_manager.backing.get_secure_random_bytes());
 636         nodes[0].node.send_payment_with_route(&route, payment_hash, RecipientOnionFields::secret_only(payment_secret), payment_id).unwrap();
 637
 638         check_added_monitors!(nodes[0], 1);
 639         let update_0 = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
 640         let mut update_add_0 = update_0.update_add_htlcs[0].clone();
 641         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &update_add_0);
 642         commitment_signed_dance!(nodes[1], nodes[0], &update_0.commitment_signed, false, true);
 643
 644         assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
 645         for (_, pending_forwards) in nodes[1].node.forward_htlcs.lock().unwrap().iter_mut() {
 646                 for f in pending_forwards.iter_mut() {
 647                         match f {
 648                                 &mut HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo { ref mut forward_info, .. }) =>
 649                                         forward_info.outgoing_cltv_value += 1,
 650                                 _ => {},
 651                         }
 652                 }
 653         }
 654         expect_pending_htlcs_forwardable!(nodes[1]);
 655
 656         check_added_monitors!(&nodes[1], 1);
 657         let update_1 = get_htlc_update_msgs!(nodes[1], nodes[2].node.get_our_node_id());
 658         let mut update_add_1 = update_1.update_add_htlcs[0].clone();
 659         nodes[2].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &update_add_1);
 660         commitment_signed_dance!(nodes[2], nodes[1], update_1.commitment_signed, false, true);
 661
 662         expect_pending_htlcs_forwardable!(nodes[2]);
 663         expect_payment_claimable!(nodes[2], payment_hash, payment_secret, 40_000);
 664         claim_payment(&nodes[0], &[&nodes[1], &nodes[2]], payment_preimage);
 665 }
 666
 667 fn do_test_onion_failure_stale_channel_update(announced_channel: bool) {
 668         // Create a network of three nodes and two channels connecting them. We'll be updating the
 669         // HTLC relay policy of the second channel, causing forwarding failures at the first hop.
 670         let mut config = UserConfig::default();
 671         config.channel_handshake_config.announced_channel = announced_channel;
 672         config.channel_handshake_limits.force_announced_channel_preference = false;
 673         config.accept_forwards_to_priv_channels = !announced_channel;
 674         let chanmon_cfgs = create_chanmon_cfgs(3);
 675         let persister;
 676         let chain_monitor;
 677         let channel_manager_1_deserialized;
 678         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
 679         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, Some(config), None]);
 680         let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs);
 681
 682         let other_channel = create_chan_between_nodes(
 683                 &nodes[0], &nodes[1],
 684         );
 685         let channel_to_update = if announced_channel {
 686                 let channel = create_announced_chan_between_nodes(
 687                         &nodes, 1, 2,
 688                 );
 689                 (channel.2, channel.0.contents.short_channel_id)
 690         } else {
 691                 let channel = create_unannounced_chan_between_nodes_with_value(
 692                         &nodes, 1, 2, 100000, 10001,
 693                 );
 694                 (channel.0.channel_id, channel.0.short_channel_id_alias.unwrap())
 695         };
 696         let channel_to_update_counterparty = &nodes[2].node.get_our_node_id();
 697
 698         let default_config = ChannelConfig::default();
 699
 700         // A test payment should succeed as the ChannelConfig has not been changed yet.
 701         const PAYMENT_AMT: u64 = 40000;
 702         let (route, payment_hash, payment_preimage, payment_secret) = if announced_channel {
 703                 get_route_and_payment_hash!(nodes[0], nodes[2], PAYMENT_AMT)
 704         } else {
 705                 let hop_hints = vec![RouteHint(vec![RouteHintHop {
 706                         src_node_id: nodes[1].node.get_our_node_id(),
 707                         short_channel_id: channel_to_update.1,
 708                         fees: RoutingFees {
 709                                 base_msat: default_config.forwarding_fee_base_msat,
 710                                 proportional_millionths: default_config.forwarding_fee_proportional_millionths,
 711                         },
 712                         cltv_expiry_delta: default_config.cltv_expiry_delta,
 713                         htlc_maximum_msat: None,
 714                         htlc_minimum_msat: None,
 715                 }])];
 716                 let payment_params = PaymentParameters::from_node_id(*channel_to_update_counterparty, TEST_FINAL_CLTV)
 717                         .with_features(nodes[2].node.invoice_features())
 718                         .with_route_hints(hop_hints);
 719                 get_route_and_payment_hash!(nodes[0], nodes[2], payment_params, PAYMENT_AMT)
 720         };
 721         send_along_route_with_secret(&nodes[0], route.clone(), &[&[&nodes[1], &nodes[2]]], PAYMENT_AMT,
 722                 payment_hash, payment_secret);
 723         claim_payment(&nodes[0], &[&nodes[1], &nodes[2]], payment_preimage);
 724
 725         // Closure to force expiry of a channel's previous config.
 726         let expire_prev_config = || {
 727                 for _ in 0..EXPIRE_PREV_CONFIG_TICKS {
 728                         nodes[1].node.timer_tick_occurred();
 729                 }
 730         };
 731
 732         // Closure to update and retrieve the latest ChannelUpdate.
 733         let update_and_get_channel_update = |config: &ChannelConfig, expect_new_update: bool,
 734                 prev_update: Option<&msgs::ChannelUpdate>, should_expire_prev_config: bool| -> Option<msgs::ChannelUpdate> {
 735                 nodes[1].node.update_channel_config(
 736                         channel_to_update_counterparty, &[channel_to_update.0], config,
 737                 ).unwrap();
 738                 let events = nodes[1].node.get_and_clear_pending_msg_events();
 739                 assert_eq!(events.len(), expect_new_update as usize);
 740                 if !expect_new_update {
 741                         return None;
 742                 }
 743                 let new_update = match &events[0] {
 744                         MessageSendEvent::BroadcastChannelUpdate { msg } => {
 745                                 assert!(announced_channel);
 746                                 msg.clone()
 747                         },
 748                         MessageSendEvent::SendChannelUpdate { node_id, msg } => {
 749                                 assert_eq!(node_id, channel_to_update_counterparty);
 750                                 assert!(!announced_channel);
 751                                 msg.clone()
 752                         },
 753                         _ => panic!("expected Broadcast/SendChannelUpdate event"),
 754                 };
 755                 if prev_update.is_some() {
 756                         assert!(new_update.contents.timestamp > prev_update.unwrap().contents.timestamp)
 757                 }
 758                 if should_expire_prev_config {
 759                         expire_prev_config();
 760                 }
 761                 Some(new_update)
 762         };
 763
 764         // We'll be attempting to route payments using the default ChannelUpdate for channels. This will
 765         // lead to onion failures at the first hop once we update the ChannelConfig for the
 766         // second hop.
 767         let expect_onion_failure = |name: &str, error_code: u16, channel_update: &msgs::ChannelUpdate| {
 768                 let short_channel_id = channel_to_update.1;
 769                 let network_update = NetworkUpdate::ChannelUpdateMessage { msg: channel_update.clone() };
 770                 run_onion_failure_test(
 771                         name, 0, &nodes, &route, &payment_hash, &payment_secret, |_| {}, || {}, true,
 772                         Some(error_code), Some(network_update), Some(short_channel_id),
 773                 );
 774         };
 775
 776         // Updates to cltv_expiry_delta below MIN_CLTV_EXPIRY_DELTA should fail with APIMisuseError.
 777         let mut invalid_config = default_config.clone();
 778         invalid_config.cltv_expiry_delta = 0;
 779         match nodes[1].node.update_channel_config(
 780                 channel_to_update_counterparty, &[channel_to_update.0], &invalid_config,
 781         ) {
 782                 Err(APIError::APIMisuseError{ .. }) => {},
 783                 _ => panic!("unexpected result applying invalid cltv_expiry_delta"),
 784         }
 785
 786         // Increase the base fee which should trigger a new ChannelUpdate.
 787         let mut config = nodes[1].node.list_usable_channels().iter()
 788                 .find(|channel| channel.channel_id == channel_to_update.0).unwrap()
 789                 .config.unwrap();
 790         config.forwarding_fee_base_msat = u32::max_value();
 791         let msg = update_and_get_channel_update(&config, true, None, false).unwrap();
 792
 793         // The old policy should still be in effect until a new block is connected.
 794         send_along_route_with_secret(&nodes[0], route.clone(), &[&[&nodes[1], &nodes[2]]], PAYMENT_AMT,
 795                 payment_hash, payment_secret);
 796         claim_payment(&nodes[0], &[&nodes[1], &nodes[2]], payment_preimage);
 797
 798         // Connect a block, which should expire the previous config, leading to a failure when
 799         // forwarding the HTLC.
 800         expire_prev_config();
 801         expect_onion_failure("fee_insufficient", UPDATE|12, &msg);
 802
 803         // Redundant updates should not trigger a new ChannelUpdate.
 804         assert!(update_and_get_channel_update(&config, false, None, false).is_none());
 805
 806         // Similarly, updates that do not have an affect on ChannelUpdate should not trigger a new one.
 807         config.force_close_avoidance_max_fee_satoshis *= 2;
 808         assert!(update_and_get_channel_update(&config, false, None, false).is_none());
 809
 810         // Reset the base fee to the default and increase the proportional fee which should trigger a
 811         // new ChannelUpdate.
 812         config.forwarding_fee_base_msat = default_config.forwarding_fee_base_msat;
 813         config.cltv_expiry_delta = u16::max_value();
 814         let msg = update_and_get_channel_update(&config, true, Some(&msg), true).unwrap();
 815         expect_onion_failure("incorrect_cltv_expiry", UPDATE|13, &msg);
 816
 817         // Reset the proportional fee and increase the CLTV expiry delta which should trigger a new
 818         // ChannelUpdate.
 819         config.cltv_expiry_delta = default_config.cltv_expiry_delta;
 820         config.forwarding_fee_proportional_millionths = u32::max_value();
 821         let msg = update_and_get_channel_update(&config, true, Some(&msg), true).unwrap();
 822         expect_onion_failure("fee_insufficient", UPDATE|12, &msg);
 823
 824         // To test persistence of the updated config, we'll re-initialize the ChannelManager.
 825         let config_after_restart = {
 826                 let chan_1_monitor_serialized = get_monitor!(nodes[1], other_channel.3).encode();
 827                 let chan_2_monitor_serialized = get_monitor!(nodes[1], channel_to_update.0).encode();
 828                 reload_node!(nodes[1], *nodes[1].node.get_current_default_configuration(), &nodes[1].node.encode(),
 829                         &[&chan_1_monitor_serialized, &chan_2_monitor_serialized], persister, chain_monitor, channel_manager_1_deserialized);
 830                 nodes[1].node.list_channels().iter()
 831                         .find(|channel| channel.channel_id == channel_to_update.0).unwrap()
 832                         .config.unwrap()
 833         };
 834         assert_eq!(config, config_after_restart);
 835 }
 836
 837 #[test]
 838 fn test_onion_failure_stale_channel_update() {
 839         do_test_onion_failure_stale_channel_update(false);
 840         do_test_onion_failure_stale_channel_update(true);
 841 }
 842
 843 #[test]
 844 fn test_always_create_tlv_format_onion_payloads() {
 845         // Verify that we always generate tlv onion format payloads, even if the features specifically
 846         // specifies no support for variable length onions, as the legacy payload format has been
 847         // deprecated in BOLT4.
 848         let chanmon_cfgs = create_chanmon_cfgs(3);
 849         let mut node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
 850
 851         // Set `node[1]`'s init features to features which return `false` for
 852         // `supports_variable_length_onion()`
 853         let mut no_variable_length_onion_features = InitFeatures::empty();
 854         no_variable_length_onion_features.set_static_remote_key_required();
 855         *node_cfgs[1].override_init_features.borrow_mut() = Some(no_variable_length_onion_features);
 856
 857         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
 858         let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs);
 859
 860         create_announced_chan_between_nodes(&nodes, 0, 1);
 861         create_announced_chan_between_nodes(&nodes, 1, 2);
 862
 863         let payment_params = PaymentParameters::from_node_id(nodes[2].node.get_our_node_id(), TEST_FINAL_CLTV)
 864                 .with_features(InvoiceFeatures::empty());
 865         let (route, _payment_hash, _payment_preimage, _payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[2], payment_params, 40000);
 866
 867         let hops = &route.paths[0].hops;
 868         // Asserts that the first hop to `node[1]` signals no support for variable length onions.
 869         assert!(!hops[0].node_features.supports_variable_length_onion());
 870         // Asserts that the first hop to `node[1]` signals no support for variable length onions.
 871         assert!(!hops[1].node_features.supports_variable_length_onion());
 872
 873         let cur_height = nodes[0].best_block_info().1 + 1;
 874         let (onion_payloads, _htlc_msat, _htlc_cltv) = onion_utils::build_onion_payloads(
 875                 &route.paths[0], 40000, RecipientOnionFields::spontaneous_empty(), cur_height, &None).unwrap();
 876
 877         match onion_payloads[0].format {
 878                 msgs::OnionHopDataFormat::NonFinalNode {..} => {},
 879                 _ => { panic!(
 880                         "Should have generated a `msgs::OnionHopDataFormat::NonFinalNode` payload for `hops[0]`,
 881                         despite that the features signals no support for variable length onions"
 882                 )}
 883         }
 884         match onion_payloads[1].format {
 885                 msgs::OnionHopDataFormat::FinalNode {..} => {},
 886                 _ => {panic!(
 887                         "Should have generated a `msgs::OnionHopDataFormat::FinalNode` payload for `hops[1]`,
 888                         despite that the features signals no support for variable length onions"
 889                 )}
 890         }
 891 }
 892
 893 fn do_test_fail_htlc_backwards_with_reason(failure_code: FailureCode) {
 894
 895         let chanmon_cfgs = create_chanmon_cfgs(2);
 896         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 897         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 898         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 899
 900         create_announced_chan_between_nodes(&nodes, 0, 1);
 901
 902         let payment_amount = 100_000;
 903         let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], payment_amount);
 904         nodes[0].node.send_payment_with_route(&route, payment_hash,
 905                 RecipientOnionFields::secret_only(payment_secret), PaymentId(payment_hash.0)).unwrap();
 906         check_added_monitors!(nodes[0], 1);
 907
 908         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
 909         let mut payment_event = SendEvent::from_event(events.pop().unwrap());
 910         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
 911         commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
 912
 913         expect_pending_htlcs_forwardable!(nodes[1]);
 914         expect_payment_claimable!(nodes[1], payment_hash, payment_secret, payment_amount);
 915         nodes[1].node.fail_htlc_backwards_with_reason(&payment_hash, failure_code);
 916
 917         expect_pending_htlcs_forwardable_and_htlc_handling_failed!(nodes[1], vec![HTLCDestination::FailedPayment { payment_hash: payment_hash }]);
 918         check_added_monitors!(nodes[1], 1);
 919
 920         let events = nodes[1].node.get_and_clear_pending_msg_events();
 921         assert_eq!(events.len(), 1);
 922         let (update_fail_htlc, commitment_signed) = match events[0] {
 923                 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 } } => {
 924                         assert!(update_add_htlcs.is_empty());
 925                         assert!(update_fulfill_htlcs.is_empty());
 926                         assert_eq!(update_fail_htlcs.len(), 1);
 927                         assert!(update_fail_malformed_htlcs.is_empty());
 928                         assert!(update_fee.is_none());
 929                         (update_fail_htlcs[0].clone(), commitment_signed)
 930                 },
 931                 _ => panic!("Unexpected event"),
 932         };
 933
 934         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &update_fail_htlc);
 935         commitment_signed_dance!(nodes[0], nodes[1], commitment_signed, false, true);
 936
 937         let failure_data = match failure_code {
 938                 FailureCode::TemporaryNodeFailure => vec![],
 939                 FailureCode::RequiredNodeFeatureMissing => vec![],
 940                 FailureCode::IncorrectOrUnknownPaymentDetails => {
 941                         let mut htlc_msat_height_data = (payment_amount as u64).to_be_bytes().to_vec();
 942                         htlc_msat_height_data.extend_from_slice(&CHAN_CONFIRM_DEPTH.to_be_bytes());
 943                         htlc_msat_height_data
 944                 }
 945         };
 946
 947         let failure_code = failure_code as u16;
 948         let permanent_flag = 0x4000;
 949         let permanent_fail = (failure_code & permanent_flag) != 0;
 950         expect_payment_failed!(nodes[0], payment_hash, permanent_fail, failure_code, failure_data);
 951
 952 }
 953
 954 #[test]
 955 fn test_fail_htlc_backwards_with_reason() {
 956         do_test_fail_htlc_backwards_with_reason(FailureCode::TemporaryNodeFailure);
 957         do_test_fail_htlc_backwards_with_reason(FailureCode::RequiredNodeFeatureMissing);
 958         do_test_fail_htlc_backwards_with_reason(FailureCode::IncorrectOrUnknownPaymentDetails);
 959 }
 960
 961 macro_rules! get_phantom_route {
 962         ($nodes: expr, $amt: expr, $channel: expr) => {{
 963                 let phantom_pubkey = $nodes[1].keys_manager.get_node_id(Recipient::PhantomNode).unwrap();
 964                 let phantom_route_hint = $nodes[1].node.get_phantom_route_hints();
 965                 let payment_params = PaymentParameters::from_node_id(phantom_pubkey, TEST_FINAL_CLTV)
 966                         .with_features($nodes[1].node.invoice_features())
 967                         .with_route_hints(vec![RouteHint(vec![
 968                                         RouteHintHop {
 969                                                 src_node_id: $nodes[0].node.get_our_node_id(),
 970                                                 short_channel_id: $channel.0.contents.short_channel_id,
 971                                                 fees: RoutingFees {
 972                                                         base_msat: $channel.0.contents.fee_base_msat,
 973                                                         proportional_millionths: $channel.0.contents.fee_proportional_millionths,
 974                                                 },
 975                                                 cltv_expiry_delta: $channel.0.contents.cltv_expiry_delta,
 976                                                 htlc_minimum_msat: None,
 977                                                 htlc_maximum_msat: None,
 978                                         },
 979                                         RouteHintHop {
 980                                                 src_node_id: phantom_route_hint.real_node_pubkey,
 981                                                 short_channel_id: phantom_route_hint.phantom_scid,
 982                                                 fees: RoutingFees {
 983                                                         base_msat: 0,
 984                                                         proportional_millionths: 0,
 985                                                 },
 986                                                 cltv_expiry_delta: MIN_CLTV_EXPIRY_DELTA,
 987                                                 htlc_minimum_msat: None,
 988                                                 htlc_maximum_msat: None,
 989                                         }
 990                 ])]);
 991                 let scorer = test_utils::TestScorer::new();
 992                 let network_graph = $nodes[0].network_graph.read_only();
 993                 (get_route(
 994                         &$nodes[0].node.get_our_node_id(), &payment_params, &network_graph,
 995                         Some(&$nodes[0].node.list_usable_channels().iter().collect::<Vec<_>>()),
 996                         $amt, $nodes[0].logger, &scorer, &[0u8; 32]
 997                 ).unwrap(), phantom_route_hint.phantom_scid)
 998         }
 999 }}
1000
1001 #[test]
1002 fn test_phantom_onion_hmac_failure() {
1003         let chanmon_cfgs = create_chanmon_cfgs(2);
1004         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
1005         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
1006         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
1007
1008         let channel = create_announced_chan_between_nodes(&nodes, 0, 1);
1009
1010         // Get the route.
1011         let recv_value_msat = 10_000;
1012         let (_, payment_hash, payment_secret) = get_payment_preimage_hash!(nodes[1], Some(recv_value_msat));
1013         let (route, phantom_scid) = get_phantom_route!(nodes, recv_value_msat, channel);
1014
1015         // Route the HTLC through to the destination.
1016         nodes[0].node.send_payment_with_route(&route, payment_hash,
1017                 RecipientOnionFields::secret_only(payment_secret), PaymentId(payment_hash.0)).unwrap();
1018         check_added_monitors!(nodes[0], 1);
1019         let update_0 = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
1020         let mut update_add = update_0.update_add_htlcs[0].clone();
1021
1022         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &update_add);
1023         commitment_signed_dance!(nodes[1], nodes[0], &update_0.commitment_signed, false, true);
1024
1025         // Modify the payload so the phantom hop's HMAC is bogus.
1026         let sha256_of_onion = {
1027                 let mut forward_htlcs = nodes[1].node.forward_htlcs.lock().unwrap();
1028                 let mut pending_forward = forward_htlcs.get_mut(&phantom_scid).unwrap();
1029                 match pending_forward[0] {
1030                         HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
1031                                 forward_info: PendingHTLCInfo {
1032                                         routing: PendingHTLCRouting::Forward { ref mut onion_packet, .. },
1033                                         ..
1034                                 }, ..
1035                         }) => {
1036                                 onion_packet.hmac[onion_packet.hmac.len() - 1] ^= 1;
1037                                 Sha256::hash(&onion_packet.hop_data).into_inner().to_vec()
1038                         },
1039                         _ => panic!("Unexpected forward"),
1040                 }
1041         };
1042         expect_pending_htlcs_forwardable_ignore!(nodes[1]);
1043         nodes[1].node.process_pending_htlc_forwards();
1044         expect_pending_htlcs_forwardable_and_htlc_handling_failed_ignore!(nodes[1], vec![HTLCDestination::FailedPayment { payment_hash }]);
1045         nodes[1].node.process_pending_htlc_forwards();
1046         let update_1 = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
1047         check_added_monitors!(&nodes[1], 1);
1048         assert!(update_1.update_fail_htlcs.len() == 1);
1049         let fail_msg = update_1.update_fail_htlcs[0].clone();
1050         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &fail_msg);
1051         commitment_signed_dance!(nodes[0], nodes[1], update_1.commitment_signed, false);
1052
1053         // Ensure the payment fails with the expected error.
1054         let mut fail_conditions = PaymentFailedConditions::new()
1055                 .blamed_scid(phantom_scid)
1056                 .blamed_chan_closed(true)
1057                 .expected_htlc_error_data(0x8000 | 0x4000 | 5, &sha256_of_onion);
1058         expect_payment_failed_conditions(&nodes[0], payment_hash, false, fail_conditions);
1059 }
1060
1061 #[test]
1062 fn test_phantom_invalid_onion_payload() {
1063         let chanmon_cfgs = create_chanmon_cfgs(2);
1064         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
1065         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
1066         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
1067
1068         let channel = create_announced_chan_between_nodes(&nodes, 0, 1);
1069
1070         // Get the route.
1071         let recv_value_msat = 10_000;
1072         let (_, payment_hash, payment_secret) = get_payment_preimage_hash!(nodes[1], Some(recv_value_msat));
1073         let (route, phantom_scid) = get_phantom_route!(nodes, recv_value_msat, channel);
1074
1075         // We'll use the session priv later when constructing an invalid onion packet.
1076         let session_priv = [3; 32];
1077         *nodes[0].keys_manager.override_random_bytes.lock().unwrap() = Some(session_priv);
1078         nodes[0].node.send_payment_with_route(&route, payment_hash,
1079                 RecipientOnionFields::secret_only(payment_secret), PaymentId(payment_hash.0)).unwrap();
1080         check_added_monitors!(nodes[0], 1);
1081         let update_0 = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
1082         let mut update_add = update_0.update_add_htlcs[0].clone();
1083
1084         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &update_add);
1085         commitment_signed_dance!(nodes[1], nodes[0], &update_0.commitment_signed, false, true);
1086
1087         // Modify the onion packet to have an invalid payment amount.
1088         for (_, pending_forwards) in nodes[1].node.forward_htlcs.lock().unwrap().iter_mut() {
1089                 for f in pending_forwards.iter_mut() {
1090                         match f {
1091                                 &mut HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
1092                                         forward_info: PendingHTLCInfo {
1093                                                 routing: PendingHTLCRouting::Forward { ref mut onion_packet, .. },
1094                                                 ..
1095                                         }, ..
1096                                 }) => {
1097                                         // Construct the onion payloads for the entire route and an invalid amount.
1098                                         let height = nodes[0].best_block_info().1;
1099                                         let session_priv = SecretKey::from_slice(&session_priv).unwrap();
1100                                         let mut onion_keys = onion_utils::construct_onion_keys(&Secp256k1::new(), &route.paths[0], &session_priv).unwrap();
1101                                         let (mut onion_payloads, _, _) = onion_utils::build_onion_payloads(
1102                                                 &route.paths[0], msgs::MAX_VALUE_MSAT + 1,
1103                                                 RecipientOnionFields::secret_only(payment_secret), height + 1, &None).unwrap();
1104                                         // We only want to construct the onion packet for the last hop, not the entire route, so
1105                                         // remove the first hop's payload and its keys.
1106                                         onion_keys.remove(0);
1107                                         onion_payloads.remove(0);
1108
1109                                         let new_onion_packet = onion_utils::construct_onion_packet(onion_payloads, onion_keys, [0; 32], &payment_hash);
1110                                         onion_packet.hop_data = new_onion_packet.hop_data;
1111                                         onion_packet.hmac = new_onion_packet.hmac;
1112                                 },
1113                                 _ => panic!("Unexpected forward"),
1114                         }
1115                 }
1116         }
1117         expect_pending_htlcs_forwardable_ignore!(nodes[1]);
1118         nodes[1].node.process_pending_htlc_forwards();
1119         expect_pending_htlcs_forwardable_and_htlc_handling_failed_ignore!(nodes[1], vec![HTLCDestination::FailedPayment { payment_hash }]);
1120         nodes[1].node.process_pending_htlc_forwards();
1121         let update_1 = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
1122         check_added_monitors!(&nodes[1], 1);
1123         assert!(update_1.update_fail_htlcs.len() == 1);
1124         let fail_msg = update_1.update_fail_htlcs[0].clone();
1125         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &fail_msg);
1126         commitment_signed_dance!(nodes[0], nodes[1], update_1.commitment_signed, false);
1127
1128         // Ensure the payment fails with the expected error.
1129         let error_data = Vec::new();
1130         let mut fail_conditions = PaymentFailedConditions::new()
1131                 .blamed_scid(phantom_scid)
1132                 .blamed_chan_closed(true)
1133                 .expected_htlc_error_data(0x4000 | 22, &error_data);
1134         expect_payment_failed_conditions(&nodes[0], payment_hash, true, fail_conditions);
1135 }
1136
1137 #[test]
1138 fn test_phantom_final_incorrect_cltv_expiry() {
1139         let chanmon_cfgs = create_chanmon_cfgs(2);
1140         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
1141         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
1142         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
1143
1144         let channel = create_announced_chan_between_nodes(&nodes, 0, 1);
1145
1146         // Get the route.
1147         let recv_value_msat = 10_000;
1148         let (_, payment_hash, payment_secret) = get_payment_preimage_hash!(nodes[1], Some(recv_value_msat));
1149         let (route, phantom_scid) = get_phantom_route!(nodes, recv_value_msat, channel);
1150
1151         // Route the HTLC through to the destination.
1152         nodes[0].node.send_payment_with_route(&route, payment_hash,
1153                 RecipientOnionFields::secret_only(payment_secret), PaymentId(payment_hash.0)).unwrap();
1154         check_added_monitors!(nodes[0], 1);
1155         let update_0 = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
1156         let mut update_add = update_0.update_add_htlcs[0].clone();
1157
1158         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &update_add);
1159         commitment_signed_dance!(nodes[1], nodes[0], &update_0.commitment_signed, false, true);
1160
1161         // Modify the payload so the phantom hop's HMAC is bogus.
1162         for (_, pending_forwards) in nodes[1].node.forward_htlcs.lock().unwrap().iter_mut() {
1163                 for f in pending_forwards.iter_mut() {
1164                         match f {
1165                                 &mut HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
1166                                         forward_info: PendingHTLCInfo { ref mut outgoing_cltv_value, .. }, ..
1167                                 }) => {
1168                                         *outgoing_cltv_value -= 1;
1169                                 },
1170                                 _ => panic!("Unexpected forward"),
1171                         }
1172                 }
1173         }
1174         expect_pending_htlcs_forwardable_ignore!(nodes[1]);
1175         nodes[1].node.process_pending_htlc_forwards();
1176         expect_pending_htlcs_forwardable_and_htlc_handling_failed_ignore!(nodes[1], vec![HTLCDestination::FailedPayment { payment_hash }]);
1177         nodes[1].node.process_pending_htlc_forwards();
1178         let update_1 = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
1179         check_added_monitors!(&nodes[1], 1);
1180         assert!(update_1.update_fail_htlcs.len() == 1);
1181         let fail_msg = update_1.update_fail_htlcs[0].clone();
1182         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &fail_msg);
1183         commitment_signed_dance!(nodes[0], nodes[1], update_1.commitment_signed, false);
1184
1185         // Ensure the payment fails with the expected error.
1186         let expected_cltv: u32 = 80;
1187         let error_data = expected_cltv.to_be_bytes().to_vec();
1188         let mut fail_conditions = PaymentFailedConditions::new()
1189                 .blamed_scid(phantom_scid)
1190                 .expected_htlc_error_data(18, &error_data);
1191         expect_payment_failed_conditions(&nodes[0], payment_hash, false, fail_conditions);
1192 }
1193
1194 #[test]
1195 fn test_phantom_failure_too_low_cltv() {
1196         let chanmon_cfgs = create_chanmon_cfgs(2);
1197         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
1198         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
1199         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
1200
1201         let channel = create_announced_chan_between_nodes(&nodes, 0, 1);
1202
1203         // Get the route.
1204         let recv_value_msat = 10_000;
1205         let (_, payment_hash, payment_secret) = get_payment_preimage_hash!(nodes[1], Some(recv_value_msat));
1206         let (mut route, phantom_scid) = get_phantom_route!(nodes, recv_value_msat, channel);
1207
1208         // Modify the route to have a too-low cltv.
1209         route.paths[0].hops[1].cltv_expiry_delta = 5;
1210
1211         // Route the HTLC through to the destination.
1212         nodes[0].node.send_payment_with_route(&route, payment_hash,
1213                 RecipientOnionFields::secret_only(payment_secret), PaymentId(payment_hash.0)).unwrap();
1214         check_added_monitors!(nodes[0], 1);
1215         let update_0 = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
1216         let mut update_add = update_0.update_add_htlcs[0].clone();
1217
1218         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &update_add);
1219         commitment_signed_dance!(nodes[1], nodes[0], &update_0.commitment_signed, false, true);
1220
1221         expect_pending_htlcs_forwardable_ignore!(nodes[1]);
1222         nodes[1].node.process_pending_htlc_forwards();
1223         expect_pending_htlcs_forwardable_and_htlc_handling_failed_ignore!(nodes[1], vec![HTLCDestination::FailedPayment { payment_hash }]);
1224         nodes[1].node.process_pending_htlc_forwards();
1225         let update_1 = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
1226         check_added_monitors!(&nodes[1], 1);
1227         assert!(update_1.update_fail_htlcs.len() == 1);
1228         let fail_msg = update_1.update_fail_htlcs[0].clone();
1229         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &fail_msg);
1230         commitment_signed_dance!(nodes[0], nodes[1], update_1.commitment_signed, false);
1231
1232         // Ensure the payment fails with the expected error.
1233         let mut error_data = recv_value_msat.to_be_bytes().to_vec();
1234         error_data.extend_from_slice(
1235                 &nodes[0].node.best_block.read().unwrap().height().to_be_bytes(),
1236         );
1237         let mut fail_conditions = PaymentFailedConditions::new()
1238                 .blamed_scid(phantom_scid)
1239                 .expected_htlc_error_data(0x4000 | 15, &error_data);
1240         expect_payment_failed_conditions(&nodes[0], payment_hash, true, fail_conditions);
1241 }
1242
1243 #[test]
1244 fn test_phantom_failure_modified_cltv() {
1245         // Test that we fail back phantoms if the upstream node fiddled with the CLTV too much with the
1246         // correct error code.
1247         let chanmon_cfgs = create_chanmon_cfgs(2);
1248         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
1249         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
1250         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
1251
1252         let channel = create_announced_chan_between_nodes(&nodes, 0, 1);
1253
1254         // Get the route.
1255         let recv_value_msat = 10_000;
1256         let (_, payment_hash, payment_secret) = get_payment_preimage_hash!(nodes[1], Some(recv_value_msat));
1257         let (mut route, phantom_scid) = get_phantom_route!(nodes, recv_value_msat, channel);
1258
1259         // Route the HTLC through to the destination.
1260         nodes[0].node.send_payment_with_route(&route, payment_hash,
1261                 RecipientOnionFields::secret_only(payment_secret), PaymentId(payment_hash.0)).unwrap();
1262         check_added_monitors!(nodes[0], 1);
1263         let update_0 = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
1264         let mut update_add = update_0.update_add_htlcs[0].clone();
1265
1266         // Modify the route to have a too-low cltv.
1267         update_add.cltv_expiry -= 10;
1268
1269         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &update_add);
1270         commitment_signed_dance!(nodes[1], nodes[0], &update_0.commitment_signed, false, true);
1271
1272         let update_1 = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
1273         assert!(update_1.update_fail_htlcs.len() == 1);
1274         let fail_msg = update_1.update_fail_htlcs[0].clone();
1275         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &fail_msg);
1276         commitment_signed_dance!(nodes[0], nodes[1], update_1.commitment_signed, false);
1277
1278         // Ensure the payment fails with the expected error.
1279         let mut fail_conditions = PaymentFailedConditions::new()
1280                 .blamed_scid(phantom_scid)
1281                 .expected_htlc_error_data(0x2000 | 2, &[]);
1282         expect_payment_failed_conditions(&nodes[0], payment_hash, false, fail_conditions);
1283 }
1284
1285 #[test]
1286 fn test_phantom_failure_expires_too_soon() {
1287         // Test that we fail back phantoms if the HTLC got delayed and we got blocks in between with
1288         // the correct error code.
1289         let chanmon_cfgs = create_chanmon_cfgs(2);
1290         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
1291         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
1292         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
1293
1294         let channel = create_announced_chan_between_nodes(&nodes, 0, 1);
1295
1296         // Get the route.
1297         let recv_value_msat = 10_000;
1298         let (_, payment_hash, payment_secret) = get_payment_preimage_hash!(nodes[1], Some(recv_value_msat));
1299         let (mut route, phantom_scid) = get_phantom_route!(nodes, recv_value_msat, channel);
1300
1301         // Route the HTLC through to the destination.
1302         nodes[0].node.send_payment_with_route(&route, payment_hash,
1303                 RecipientOnionFields::secret_only(payment_secret), PaymentId(payment_hash.0)).unwrap();
1304         check_added_monitors!(nodes[0], 1);
1305         let update_0 = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
1306         let mut update_add = update_0.update_add_htlcs[0].clone();
1307
1308         connect_blocks(&nodes[1], CLTV_FAR_FAR_AWAY);
1309         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &update_add);
1310         commitment_signed_dance!(nodes[1], nodes[0], &update_0.commitment_signed, false, true);
1311
1312         let update_1 = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
1313         assert!(update_1.update_fail_htlcs.len() == 1);
1314         let fail_msg = update_1.update_fail_htlcs[0].clone();
1315         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &fail_msg);
1316         commitment_signed_dance!(nodes[0], nodes[1], update_1.commitment_signed, false);
1317
1318         // Ensure the payment fails with the expected error.
1319         let mut fail_conditions = PaymentFailedConditions::new()
1320                 .blamed_scid(phantom_scid)
1321                 .expected_htlc_error_data(0x2000 | 2, &[]);
1322         expect_payment_failed_conditions(&nodes[0], payment_hash, false, fail_conditions);
1323 }
1324
1325 #[test]
1326 fn test_phantom_failure_too_low_recv_amt() {
1327         let chanmon_cfgs = create_chanmon_cfgs(2);
1328         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
1329         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
1330         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
1331
1332         let channel = create_announced_chan_between_nodes(&nodes, 0, 1);
1333
1334         // Get the route with a too-low amount.
1335         let recv_amt_msat = 10_000;
1336         let bad_recv_amt_msat = recv_amt_msat - 10;
1337         let (_, payment_hash, payment_secret) = get_payment_preimage_hash!(nodes[1], Some(recv_amt_msat));
1338         let (mut route, phantom_scid) = get_phantom_route!(nodes, bad_recv_amt_msat, channel);
1339
1340         // Route the HTLC through to the destination.
1341         nodes[0].node.send_payment_with_route(&route, payment_hash,
1342                 RecipientOnionFields::secret_only(payment_secret), PaymentId(payment_hash.0)).unwrap();
1343         check_added_monitors!(nodes[0], 1);
1344         let update_0 = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
1345         let mut update_add = update_0.update_add_htlcs[0].clone();
1346
1347         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &update_add);
1348         commitment_signed_dance!(nodes[1], nodes[0], &update_0.commitment_signed, false, true);
1349
1350         expect_pending_htlcs_forwardable_ignore!(nodes[1]);
1351         nodes[1].node.process_pending_htlc_forwards();
1352         expect_pending_htlcs_forwardable_ignore!(nodes[1]);
1353         nodes[1].node.process_pending_htlc_forwards();
1354         expect_pending_htlcs_forwardable_and_htlc_handling_failed_ignore!(nodes[1], vec![HTLCDestination::FailedPayment { payment_hash: payment_hash.clone() }]);
1355         nodes[1].node.process_pending_htlc_forwards();
1356         let update_1 = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
1357         check_added_monitors!(&nodes[1], 1);
1358         assert!(update_1.update_fail_htlcs.len() == 1);
1359         let fail_msg = update_1.update_fail_htlcs[0].clone();
1360         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &fail_msg);
1361         commitment_signed_dance!(nodes[0], nodes[1], update_1.commitment_signed, false);
1362
1363         // Ensure the payment fails with the expected error.
1364         let mut error_data = bad_recv_amt_msat.to_be_bytes().to_vec();
1365         error_data.extend_from_slice(&nodes[1].node.best_block.read().unwrap().height().to_be_bytes());
1366         let mut fail_conditions = PaymentFailedConditions::new()
1367                 .blamed_scid(phantom_scid)
1368                 .expected_htlc_error_data(0x4000 | 15, &error_data);
1369         expect_payment_failed_conditions(&nodes[0], payment_hash, true, fail_conditions);
1370 }
1371
1372 #[test]
1373 fn test_phantom_dust_exposure_failure() {
1374         // Set the max dust exposure to the dust limit.
1375         let max_dust_exposure = 546;
1376         let mut receiver_config = UserConfig::default();
1377         receiver_config.channel_config.max_dust_htlc_exposure_msat = max_dust_exposure;
1378         receiver_config.channel_handshake_config.announced_channel = true;
1379
1380         let chanmon_cfgs = create_chanmon_cfgs(2);
1381         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
1382         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, Some(receiver_config)]);
1383         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
1384
1385         let channel = create_announced_chan_between_nodes(&nodes, 0, 1);
1386
1387         // Get the route with an amount exceeding the dust exposure threshold of nodes[1].
1388         let (_, payment_hash, payment_secret) = get_payment_preimage_hash!(nodes[1], Some(max_dust_exposure + 1));
1389         let (mut route, _) = get_phantom_route!(nodes, max_dust_exposure + 1, channel);
1390
1391         // Route the HTLC through to the destination.
1392         nodes[0].node.send_payment_with_route(&route, payment_hash,
1393                 RecipientOnionFields::secret_only(payment_secret), PaymentId(payment_hash.0)).unwrap();
1394         check_added_monitors!(nodes[0], 1);
1395         let update_0 = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
1396         let mut update_add = update_0.update_add_htlcs[0].clone();
1397
1398         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &update_add);
1399         commitment_signed_dance!(nodes[1], nodes[0], &update_0.commitment_signed, false, true);
1400
1401         let update_1 = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
1402         assert!(update_1.update_fail_htlcs.len() == 1);
1403         let fail_msg = update_1.update_fail_htlcs[0].clone();
1404         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &fail_msg);
1405         commitment_signed_dance!(nodes[0], nodes[1], update_1.commitment_signed, false);
1406
1407         // Ensure the payment fails with the expected error.
1408         let mut err_data = Vec::new();
1409         err_data.extend_from_slice(&(channel.1.serialized_length() as u16 + 2).to_be_bytes());
1410         err_data.extend_from_slice(&ChannelUpdate::TYPE.to_be_bytes());
1411         err_data.extend_from_slice(&channel.1.encode());
1412
1413         let mut fail_conditions = PaymentFailedConditions::new()
1414                 .blamed_scid(channel.0.contents.short_channel_id)
1415                 .blamed_chan_closed(false)
1416                 .expected_htlc_error_data(0x1000 | 7, &err_data);
1417                 expect_payment_failed_conditions(&nodes[0], payment_hash, false, fail_conditions);
1418 }
1419
1420 #[test]
1421 fn test_phantom_failure_reject_payment() {
1422         // Test that the user can successfully fail back a phantom node payment.
1423         let chanmon_cfgs = create_chanmon_cfgs(2);
1424         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
1425         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
1426         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
1427
1428         let channel = create_announced_chan_between_nodes(&nodes, 0, 1);
1429
1430         // Get the route with a too-low amount.
1431         let recv_amt_msat = 10_000;
1432         let (_, payment_hash, payment_secret) = get_payment_preimage_hash!(nodes[1], Some(recv_amt_msat));
1433         let (mut route, phantom_scid) = get_phantom_route!(nodes, recv_amt_msat, channel);
1434
1435         // Route the HTLC through to the destination.
1436         nodes[0].node.send_payment_with_route(&route, payment_hash,
1437                 RecipientOnionFields::secret_only(payment_secret), PaymentId(payment_hash.0)).unwrap();
1438         check_added_monitors!(nodes[0], 1);
1439         let update_0 = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
1440         let mut update_add = update_0.update_add_htlcs[0].clone();
1441
1442         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &update_add);
1443         commitment_signed_dance!(nodes[1], nodes[0], &update_0.commitment_signed, false, true);
1444
1445         expect_pending_htlcs_forwardable_ignore!(nodes[1]);
1446         nodes[1].node.process_pending_htlc_forwards();
1447         expect_pending_htlcs_forwardable_ignore!(nodes[1]);
1448         nodes[1].node.process_pending_htlc_forwards();
1449         expect_payment_claimable!(nodes[1], payment_hash, payment_secret, recv_amt_msat, None, route.paths[0].hops.last().unwrap().pubkey);
1450         nodes[1].node.fail_htlc_backwards(&payment_hash);
1451         expect_pending_htlcs_forwardable_and_htlc_handling_failed_ignore!(nodes[1], vec![HTLCDestination::FailedPayment { payment_hash }]);
1452         nodes[1].node.process_pending_htlc_forwards();
1453
1454         let update_1 = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
1455         check_added_monitors!(&nodes[1], 1);
1456         assert!(update_1.update_fail_htlcs.len() == 1);
1457         let fail_msg = update_1.update_fail_htlcs[0].clone();
1458         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &fail_msg);
1459         commitment_signed_dance!(nodes[0], nodes[1], update_1.commitment_signed, false);
1460
1461         // Ensure the payment fails with the expected error.
1462         let mut error_data = recv_amt_msat.to_be_bytes().to_vec();
1463         error_data.extend_from_slice(&nodes[1].node.best_block.read().unwrap().height().to_be_bytes());
1464         let mut fail_conditions = PaymentFailedConditions::new()
1465                 .blamed_scid(phantom_scid)
1466                 .expected_htlc_error_data(0x4000 | 15, &error_data);
1467         expect_payment_failed_conditions(&nodes[0], payment_hash, true, fail_conditions);
1468 }