_ Git - rust-lightning/blob - fuzz/src/chanmon_consistency.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 //! Test that monitor update failures don't get our channel state out of sync.
  11 //! One of the biggest concern with the monitor update failure handling code is that messages
  12 //! resent after monitor updating is restored are delivered out-of-order, resulting in
  13 //! commitment_signed messages having "invalid signatures".
  14 //! To test this we stand up a network of three nodes and read bytes from the fuzz input to denote
  15 //! actions such as sending payments, handling events, or changing monitor update return values on
  16 //! a per-node basis. This should allow it to find any cases where the ordering of actions results
  17 //! in us getting out of sync with ourselves, and, assuming at least one of our recieve- or
  18 //! send-side handling is correct, other peers. We consider it a failure if any action results in a
  19 //! channel being force-closed.
  20
  21 use bitcoin::blockdata::block::BlockHeader;
  22 use bitcoin::blockdata::constants::genesis_block;
  23 use bitcoin::blockdata::transaction::{Transaction, TxOut};
  24 use bitcoin::blockdata::script::{Builder, Script};
  25 use bitcoin::blockdata::opcodes;
  26 use bitcoin::network::constants::Network;
  27
  28 use bitcoin::hashes::Hash as TraitImport;
  29 use bitcoin::hashes::sha256::Hash as Sha256;
  30 use bitcoin::hash_types::{BlockHash, WPubkeyHash};
  31
  32 use lightning::chain;
  33 use lightning::chain::{BestBlock, chainmonitor, channelmonitor, Confirm, Watch};
  34 use lightning::chain::channelmonitor::{ChannelMonitor, ChannelMonitorUpdateErr, MonitorEvent};
  35 use lightning::chain::transaction::OutPoint;
  36 use lightning::chain::chaininterface::{BroadcasterInterface, ConfirmationTarget, FeeEstimator};
  37 use lightning::chain::keysinterface::{KeysInterface, InMemorySigner};
  38 use lightning::ln::{PaymentHash, PaymentPreimage, PaymentSecret};
  39 use lightning::ln::channelmanager::{ChainParameters, ChannelManager, PaymentSendFailure, ChannelManagerReadArgs};
  40 use lightning::ln::features::{ChannelFeatures, InitFeatures, NodeFeatures};
  41 use lightning::ln::msgs::{CommitmentUpdate, ChannelMessageHandler, DecodeError, UpdateAddHTLC, Init};
  42 use lightning::util::enforcing_trait_impls::{EnforcingSigner, INITIAL_REVOKED_COMMITMENT_NUMBER};
  43 use lightning::util::errors::APIError;
  44 use lightning::util::events;
  45 use lightning::util::logger::Logger;
  46 use lightning::util::config::UserConfig;
  47 use lightning::util::events::MessageSendEventsProvider;
  48 use lightning::util::ser::{Readable, ReadableArgs, Writeable, Writer};
  49 use lightning::routing::router::{Route, RouteHop};
  50
  51
  52 use utils::test_logger;
  53 use utils::test_persister::TestPersister;
  54
  55 use bitcoin::secp256k1::key::{PublicKey,SecretKey};
  56 use bitcoin::secp256k1::recovery::RecoverableSignature;
  57 use bitcoin::secp256k1::Secp256k1;
  58
  59 use std::mem;
  60 use std::cmp::Ordering;
  61 use std::collections::{HashSet, hash_map, HashMap};
  62 use std::sync::{Arc,Mutex};
  63 use std::sync::atomic;
  64 use std::io::Cursor;
  65
  66 struct FuzzEstimator {}
  67 impl FeeEstimator for FuzzEstimator {
  68         fn get_est_sat_per_1000_weight(&self, _: ConfirmationTarget) -> u32 {
  69                 253
  70         }
  71 }
  72
  73 pub struct TestBroadcaster {}
  74 impl BroadcasterInterface for TestBroadcaster {
  75         fn broadcast_transaction(&self, _tx: &Transaction) { }
  76 }
  77
  78 pub struct VecWriter(pub Vec<u8>);
  79 impl Writer for VecWriter {
  80         fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
  81                 self.0.extend_from_slice(buf);
  82                 Ok(())
  83         }
  84         fn size_hint(&mut self, size: usize) {
  85                 self.0.reserve_exact(size);
  86         }
  87 }
  88
  89 struct TestChainMonitor {
  90         pub logger: Arc<dyn Logger>,
  91         pub keys: Arc<KeyProvider>,
  92         pub chain_monitor: Arc<chainmonitor::ChainMonitor<EnforcingSigner, Arc<dyn chain::Filter>, Arc<TestBroadcaster>, Arc<FuzzEstimator>, Arc<dyn Logger>, Arc<TestPersister>>>,
  93         pub update_ret: Mutex<Result<(), channelmonitor::ChannelMonitorUpdateErr>>,
  94         // If we reload a node with an old copy of ChannelMonitors, the ChannelManager deserialization
  95         // logic will automatically force-close our channels for us (as we don't have an up-to-date
  96         // monitor implying we are not able to punish misbehaving counterparties). Because this test
  97         // "fails" if we ever force-close a channel, we avoid doing so, always saving the latest
  98         // fully-serialized monitor state here, as well as the corresponding update_id.
  99         pub latest_monitors: Mutex<HashMap<OutPoint, (u64, Vec<u8>)>>,
 100         pub should_update_manager: atomic::AtomicBool,
 101 }
 102 impl TestChainMonitor {
 103         pub fn new(broadcaster: Arc<TestBroadcaster>, logger: Arc<dyn Logger>, feeest: Arc<FuzzEstimator>, persister: Arc<TestPersister>, keys: Arc<KeyProvider>) -> Self {
 104                 Self {
 105                         chain_monitor: Arc::new(chainmonitor::ChainMonitor::new(None, broadcaster, logger.clone(), feeest, persister)),
 106                         logger,
 107                         keys,
 108                         update_ret: Mutex::new(Ok(())),
 109                         latest_monitors: Mutex::new(HashMap::new()),
 110                         should_update_manager: atomic::AtomicBool::new(false),
 111                 }
 112         }
 113 }
 114 impl chain::Watch<EnforcingSigner> for TestChainMonitor {
 115         fn watch_channel(&self, funding_txo: OutPoint, monitor: channelmonitor::ChannelMonitor<EnforcingSigner>) -> Result<(), channelmonitor::ChannelMonitorUpdateErr> {
 116                 let mut ser = VecWriter(Vec::new());
 117                 monitor.write(&mut ser).unwrap();
 118                 if let Some(_) = self.latest_monitors.lock().unwrap().insert(funding_txo, (monitor.get_latest_update_id(), ser.0)) {
 119                         panic!("Already had monitor pre-watch_channel");
 120                 }
 121                 self.should_update_manager.store(true, atomic::Ordering::Relaxed);
 122                 assert!(self.chain_monitor.watch_channel(funding_txo, monitor).is_ok());
 123                 self.update_ret.lock().unwrap().clone()
 124         }
 125
 126         fn update_channel(&self, funding_txo: OutPoint, update: channelmonitor::ChannelMonitorUpdate) -> Result<(), channelmonitor::ChannelMonitorUpdateErr> {
 127                 let mut map_lock = self.latest_monitors.lock().unwrap();
 128                 let mut map_entry = match map_lock.entry(funding_txo) {
 129                         hash_map::Entry::Occupied(entry) => entry,
 130                         hash_map::Entry::Vacant(_) => panic!("Didn't have monitor on update call"),
 131                 };
 132                 let deserialized_monitor = <(BlockHash, channelmonitor::ChannelMonitor<EnforcingSigner>)>::
 133                         read(&mut Cursor::new(&map_entry.get().1), &*self.keys).unwrap().1;
 134                 deserialized_monitor.update_monitor(&update, &&TestBroadcaster{}, &&FuzzEstimator{}, &self.logger).unwrap();
 135                 let mut ser = VecWriter(Vec::new());
 136                 deserialized_monitor.write(&mut ser).unwrap();
 137                 map_entry.insert((update.update_id, ser.0));
 138                 self.should_update_manager.store(true, atomic::Ordering::Relaxed);
 139                 assert!(self.chain_monitor.update_channel(funding_txo, update).is_ok());
 140                 self.update_ret.lock().unwrap().clone()
 141         }
 142
 143         fn release_pending_monitor_events(&self) -> Vec<MonitorEvent> {
 144                 return self.chain_monitor.release_pending_monitor_events();
 145         }
 146 }
 147
 148 struct KeyProvider {
 149         node_id: u8,
 150         rand_bytes_id: atomic::AtomicU32,
 151         revoked_commitments: Mutex<HashMap<[u8;32], Arc<Mutex<u64>>>>,
 152 }
 153 impl KeysInterface for KeyProvider {
 154         type Signer = EnforcingSigner;
 155
 156         fn get_node_secret(&self) -> SecretKey {
 157                 SecretKey::from_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, self.node_id]).unwrap()
 158         }
 159
 160         fn get_destination_script(&self) -> Script {
 161                 let secp_ctx = Secp256k1::signing_only();
 162                 let channel_monitor_claim_key = SecretKey::from_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, self.node_id]).unwrap();
 163                 let our_channel_monitor_claim_key_hash = WPubkeyHash::hash(&PublicKey::from_secret_key(&secp_ctx, &channel_monitor_claim_key).serialize());
 164                 Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0).push_slice(&our_channel_monitor_claim_key_hash[..]).into_script()
 165         }
 166
 167         fn get_shutdown_pubkey(&self) -> PublicKey {
 168                 let secp_ctx = Secp256k1::signing_only();
 169                 PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, self.node_id]).unwrap())
 170         }
 171
 172         fn get_channel_signer(&self, _inbound: bool, channel_value_satoshis: u64) -> EnforcingSigner {
 173                 let secp_ctx = Secp256k1::signing_only();
 174                 let id = self.rand_bytes_id.fetch_add(1, atomic::Ordering::Relaxed);
 175                 let keys = InMemorySigner::new(
 176                         &secp_ctx,
 177                         SecretKey::from_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, self.node_id]).unwrap(),
 178                         SecretKey::from_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, self.node_id]).unwrap(),
 179                         SecretKey::from_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, self.node_id]).unwrap(),
 180                         SecretKey::from_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, self.node_id]).unwrap(),
 181                         SecretKey::from_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, self.node_id]).unwrap(),
 182                         [id as u8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, self.node_id],
 183                         channel_value_satoshis,
 184                         [0; 32],
 185                 );
 186                 let revoked_commitment = self.make_revoked_commitment_cell(keys.commitment_seed);
 187                 EnforcingSigner::new_with_revoked(keys, revoked_commitment, false)
 188         }
 189
 190         fn get_secure_random_bytes(&self) -> [u8; 32] {
 191                 let id = self.rand_bytes_id.fetch_add(1, atomic::Ordering::Relaxed);
 192                 let mut res = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, self.node_id];
 193                 res[30-4..30].copy_from_slice(&id.to_le_bytes());
 194                 res
 195         }
 196
 197         fn read_chan_signer(&self, buffer: &[u8]) -> Result<Self::Signer, DecodeError> {
 198                 let mut reader = std::io::Cursor::new(buffer);
 199
 200                 let inner: InMemorySigner = Readable::read(&mut reader)?;
 201                 let revoked_commitment = self.make_revoked_commitment_cell(inner.commitment_seed);
 202
 203                 let last_commitment_number = Readable::read(&mut reader)?;
 204
 205                 Ok(EnforcingSigner {
 206                         inner,
 207                         last_commitment_number: Arc::new(Mutex::new(last_commitment_number)),
 208                         revoked_commitment,
 209                         disable_revocation_policy_check: false,
 210                 })
 211         }
 212
 213         fn sign_invoice(&self, _invoice_preimage: Vec<u8>) -> Result<RecoverableSignature, ()> {
 214                 unreachable!()
 215         }
 216 }
 217
 218 impl KeyProvider {
 219         fn make_revoked_commitment_cell(&self, commitment_seed: [u8; 32]) -> Arc<Mutex<u64>> {
 220                 let mut revoked_commitments = self.revoked_commitments.lock().unwrap();
 221                 if !revoked_commitments.contains_key(&commitment_seed) {
 222                         revoked_commitments.insert(commitment_seed, Arc::new(Mutex::new(INITIAL_REVOKED_COMMITMENT_NUMBER)));
 223                 }
 224                 let cell = revoked_commitments.get(&commitment_seed).unwrap();
 225                 Arc::clone(cell)
 226         }
 227 }
 228
 229 #[inline]
 230 fn check_api_err(api_err: APIError) {
 231         match api_err {
 232                 APIError::APIMisuseError { .. } => panic!("We can't misuse the API"),
 233                 APIError::FeeRateTooHigh { .. } => panic!("We can't send too much fee?"),
 234                 APIError::RouteError { .. } => panic!("Our routes should work"),
 235                 APIError::ChannelUnavailable { err } => {
 236                         // Test the error against a list of errors we can hit, and reject
 237                         // all others. If you hit this panic, the list of acceptable errors
 238                         // is probably just stale and you should add new messages here.
 239                         match err.as_str() {
 240                                 "Peer for first hop currently disconnected/pending monitor update!" => {},
 241                                 _ if err.starts_with("Cannot push more than their max accepted HTLCs ") => {},
 242                                 _ if err.starts_with("Cannot send value that would put us over the max HTLC value in flight our peer will accept ") => {},
 243                                 _ if err.starts_with("Cannot send value that would put our balance under counterparty-announced channel reserve value") => {},
 244                                 _ if err.starts_with("Cannot send value that would overdraw remaining funds.") => {},
 245                                 _ if err.starts_with("Cannot send value that would not leave enough to pay for fees.") => {},
 246                                 _ => panic!("{}", err),
 247                         }
 248                 },
 249                 APIError::MonitorUpdateFailed => {
 250                         // We can (obviously) temp-fail a monitor update
 251                 },
 252         }
 253 }
 254 #[inline]
 255 fn check_payment_err(send_err: PaymentSendFailure) {
 256         match send_err {
 257                 PaymentSendFailure::ParameterError(api_err) => check_api_err(api_err),
 258                 PaymentSendFailure::PathParameterError(per_path_results) => {
 259                         for res in per_path_results { if let Err(api_err) = res { check_api_err(api_err); } }
 260                 },
 261                 PaymentSendFailure::AllFailedRetrySafe(per_path_results) => {
 262                         for api_err in per_path_results { check_api_err(api_err); }
 263                 },
 264                 PaymentSendFailure::PartialFailure(per_path_results) => {
 265                         for res in per_path_results { if let Err(api_err) = res { check_api_err(api_err); } }
 266                 },
 267         }
 268 }
 269
 270 type ChanMan = ChannelManager<EnforcingSigner, Arc<TestChainMonitor>, Arc<TestBroadcaster>, Arc<KeyProvider>, Arc<FuzzEstimator>, Arc<dyn Logger>>;
 271
 272 #[inline]
 273 fn get_payment_secret_hash(dest: &ChanMan, payment_id: &mut u8) -> Option<(PaymentSecret, PaymentHash)> {
 274         let mut payment_hash;
 275         for _ in 0..256 {
 276                 payment_hash = PaymentHash(Sha256::hash(&[*payment_id; 1]).into_inner());
 277                 if let Ok(payment_secret) = dest.create_inbound_payment_for_hash(payment_hash, None, 3600, 0) {
 278                         return Some((payment_secret, payment_hash));
 279                 }
 280                 *payment_id = payment_id.wrapping_add(1);
 281         }
 282         None
 283 }
 284
 285 #[inline]
 286 fn send_payment(source: &ChanMan, dest: &ChanMan, dest_chan_id: u64, amt: u64, payment_id: &mut u8) -> bool {
 287         let (payment_secret, payment_hash) =
 288                 if let Some((secret, hash)) = get_payment_secret_hash(dest, payment_id) { (secret, hash) } else { return true; };
 289         if let Err(err) = source.send_payment(&Route {
 290                 paths: vec![vec![RouteHop {
 291                         pubkey: dest.get_our_node_id(),
 292                         node_features: NodeFeatures::known(),
 293                         short_channel_id: dest_chan_id,
 294                         channel_features: ChannelFeatures::known(),
 295                         fee_msat: amt,
 296                         cltv_expiry_delta: 200,
 297                 }]],
 298         }, payment_hash, &Some(payment_secret)) {
 299                 check_payment_err(err);
 300                 false
 301         } else { true }
 302 }
 303 #[inline]
 304 fn send_hop_payment(source: &ChanMan, middle: &ChanMan, middle_chan_id: u64, dest: &ChanMan, dest_chan_id: u64, amt: u64, payment_id: &mut u8) -> bool {
 305         let (payment_secret, payment_hash) =
 306                 if let Some((secret, hash)) = get_payment_secret_hash(dest, payment_id) { (secret, hash) } else { return true; };
 307         if let Err(err) = source.send_payment(&Route {
 308                 paths: vec![vec![RouteHop {
 309                         pubkey: middle.get_our_node_id(),
 310                         node_features: NodeFeatures::known(),
 311                         short_channel_id: middle_chan_id,
 312                         channel_features: ChannelFeatures::known(),
 313                         fee_msat: 50000,
 314                         cltv_expiry_delta: 100,
 315                 },RouteHop {
 316                         pubkey: dest.get_our_node_id(),
 317                         node_features: NodeFeatures::known(),
 318                         short_channel_id: dest_chan_id,
 319                         channel_features: ChannelFeatures::known(),
 320                         fee_msat: amt,
 321                         cltv_expiry_delta: 200,
 322                 }]],
 323         }, payment_hash, &Some(payment_secret)) {
 324                 check_payment_err(err);
 325                 false
 326         } else { true }
 327 }
 328
 329 #[inline]
 330 pub fn do_test<Out: test_logger::Output>(data: &[u8], out: Out) {
 331         let fee_est = Arc::new(FuzzEstimator{});
 332         let broadcast = Arc::new(TestBroadcaster{});
 333
 334         macro_rules! make_node {
 335                 ($node_id: expr) => { {
 336                         let logger: Arc<dyn Logger> = Arc::new(test_logger::TestLogger::new($node_id.to_string(), out.clone()));
 337                         let keys_manager = Arc::new(KeyProvider { node_id: $node_id, rand_bytes_id: atomic::AtomicU32::new(0), revoked_commitments: Mutex::new(HashMap::new()) });
 338                         let monitor = Arc::new(TestChainMonitor::new(broadcast.clone(), logger.clone(), fee_est.clone(), Arc::new(TestPersister{}), Arc::clone(&keys_manager)));
 339
 340                         let mut config = UserConfig::default();
 341                         config.channel_options.forwarding_fee_proportional_millionths = 0;
 342                         config.channel_options.announced_channel = true;
 343                         let network = Network::Bitcoin;
 344                         let params = ChainParameters {
 345                                 network,
 346                                 best_block: BestBlock::from_genesis(network),
 347                         };
 348                         (ChannelManager::new(fee_est.clone(), monitor.clone(), broadcast.clone(), Arc::clone(&logger), keys_manager.clone(), config, params),
 349                         monitor, keys_manager)
 350                 } }
 351         }
 352
 353         macro_rules! reload_node {
 354                 ($ser: expr, $node_id: expr, $old_monitors: expr, $keys_manager: expr) => { {
 355                     let keys_manager = Arc::clone(& $keys_manager);
 356                         let logger: Arc<dyn Logger> = Arc::new(test_logger::TestLogger::new($node_id.to_string(), out.clone()));
 357                         let chain_monitor = Arc::new(TestChainMonitor::new(broadcast.clone(), logger.clone(), fee_est.clone(), Arc::new(TestPersister{}), Arc::clone(& $keys_manager)));
 358
 359                         let mut config = UserConfig::default();
 360                         config.channel_options.forwarding_fee_proportional_millionths = 0;
 361                         config.channel_options.announced_channel = true;
 362
 363                         let mut monitors = HashMap::new();
 364                         let mut old_monitors = $old_monitors.latest_monitors.lock().unwrap();
 365                         for (outpoint, (update_id, monitor_ser)) in old_monitors.drain() {
 366                                 monitors.insert(outpoint, <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(&mut Cursor::new(&monitor_ser), &*$keys_manager).expect("Failed to read monitor").1);
 367                                 chain_monitor.latest_monitors.lock().unwrap().insert(outpoint, (update_id, monitor_ser));
 368                         }
 369                         let mut monitor_refs = HashMap::new();
 370                         for (outpoint, monitor) in monitors.iter_mut() {
 371                                 monitor_refs.insert(*outpoint, monitor);
 372                         }
 373
 374                         let read_args = ChannelManagerReadArgs {
 375                                 keys_manager,
 376                                 fee_estimator: fee_est.clone(),
 377                                 chain_monitor: chain_monitor.clone(),
 378                                 tx_broadcaster: broadcast.clone(),
 379                                 logger,
 380                                 default_config: config,
 381                                 channel_monitors: monitor_refs,
 382                         };
 383
 384                         let res = (<(BlockHash, ChanMan)>::read(&mut Cursor::new(&$ser.0), read_args).expect("Failed to read manager").1, chain_monitor.clone());
 385                         for (funding_txo, mon) in monitors.drain() {
 386                                 assert!(chain_monitor.chain_monitor.watch_channel(funding_txo, mon).is_ok());
 387                         }
 388                         res
 389                 } }
 390         }
 391
 392         let mut channel_txn = Vec::new();
 393         macro_rules! make_channel {
 394                 ($source: expr, $dest: expr, $chan_id: expr) => { {
 395                         $source.create_channel($dest.get_our_node_id(), 100_000, 42, 0, None).unwrap();
 396                         let open_channel = {
 397                                 let events = $source.get_and_clear_pending_msg_events();
 398                                 assert_eq!(events.len(), 1);
 399                                 if let events::MessageSendEvent::SendOpenChannel { ref msg, .. } = events[0] {
 400                                         msg.clone()
 401                                 } else { panic!("Wrong event type"); }
 402                         };
 403
 404                         $dest.handle_open_channel(&$source.get_our_node_id(), InitFeatures::known(), &open_channel);
 405                         let accept_channel = {
 406                                 let events = $dest.get_and_clear_pending_msg_events();
 407                                 assert_eq!(events.len(), 1);
 408                                 if let events::MessageSendEvent::SendAcceptChannel { ref msg, .. } = events[0] {
 409                                         msg.clone()
 410                                 } else { panic!("Wrong event type"); }
 411                         };
 412
 413                         $source.handle_accept_channel(&$dest.get_our_node_id(), InitFeatures::known(), &accept_channel);
 414                         let funding_output;
 415                         {
 416                                 let events = $source.get_and_clear_pending_events();
 417                                 assert_eq!(events.len(), 1);
 418                                 if let events::Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, .. } = events[0] {
 419                                         let tx = Transaction { version: $chan_id, lock_time: 0, input: Vec::new(), output: vec![TxOut {
 420                                                 value: *channel_value_satoshis, script_pubkey: output_script.clone(),
 421                                         }]};
 422                                         funding_output = OutPoint { txid: tx.txid(), index: 0 };
 423                                         $source.funding_transaction_generated(&temporary_channel_id, tx.clone()).unwrap();
 424                                         channel_txn.push(tx);
 425                                 } else { panic!("Wrong event type"); }
 426                         }
 427
 428                         let funding_created = {
 429                                 let events = $source.get_and_clear_pending_msg_events();
 430                                 assert_eq!(events.len(), 1);
 431                                 if let events::MessageSendEvent::SendFundingCreated { ref msg, .. } = events[0] {
 432                                         msg.clone()
 433                                 } else { panic!("Wrong event type"); }
 434                         };
 435                         $dest.handle_funding_created(&$source.get_our_node_id(), &funding_created);
 436
 437                         let funding_signed = {
 438                                 let events = $dest.get_and_clear_pending_msg_events();
 439                                 assert_eq!(events.len(), 1);
 440                                 if let events::MessageSendEvent::SendFundingSigned { ref msg, .. } = events[0] {
 441                                         msg.clone()
 442                                 } else { panic!("Wrong event type"); }
 443                         };
 444                         $source.handle_funding_signed(&$dest.get_our_node_id(), &funding_signed);
 445
 446                         funding_output
 447                 } }
 448         }
 449
 450         macro_rules! confirm_txn {
 451                 ($node: expr) => { {
 452                         let chain_hash = genesis_block(Network::Bitcoin).block_hash();
 453                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: chain_hash, merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 454                         let txdata: Vec<_> = channel_txn.iter().enumerate().map(|(i, tx)| (i + 1, tx)).collect();
 455                         $node.transactions_confirmed(&header, &txdata, 1);
 456                         for _ in 2..100 {
 457                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 458                         }
 459                         $node.best_block_updated(&header, 99);
 460                 } }
 461         }
 462
 463         macro_rules! lock_fundings {
 464                 ($nodes: expr) => { {
 465                         let mut node_events = Vec::new();
 466                         for node in $nodes.iter() {
 467                                 node_events.push(node.get_and_clear_pending_msg_events());
 468                         }
 469                         for (idx, node_event) in node_events.iter().enumerate() {
 470                                 for event in node_event {
 471                                         if let events::MessageSendEvent::SendFundingLocked { ref node_id, ref msg } = event {
 472                                                 for node in $nodes.iter() {
 473                                                         if node.get_our_node_id() == *node_id {
 474                                                                 node.handle_funding_locked(&$nodes[idx].get_our_node_id(), msg);
 475                                                         }
 476                                                 }
 477                                         } else { panic!("Wrong event type"); }
 478                                 }
 479                         }
 480
 481                         for node in $nodes.iter() {
 482                                 let events = node.get_and_clear_pending_msg_events();
 483                                 for event in events {
 484                                         if let events::MessageSendEvent::SendAnnouncementSignatures { .. } = event {
 485                                         } else { panic!("Wrong event type"); }
 486                                 }
 487                         }
 488                 } }
 489         }
 490
 491         // 3 nodes is enough to hit all the possible cases, notably unknown-source-unknown-dest
 492         // forwarding.
 493         let (node_a, mut monitor_a, keys_manager_a) = make_node!(0);
 494         let (node_b, mut monitor_b, keys_manager_b) = make_node!(1);
 495         let (node_c, mut monitor_c, keys_manager_c) = make_node!(2);
 496
 497         let mut nodes = [node_a, node_b, node_c];
 498
 499         let chan_1_funding = make_channel!(nodes[0], nodes[1], 0);
 500         let chan_2_funding = make_channel!(nodes[1], nodes[2], 1);
 501
 502         for node in nodes.iter() {
 503                 confirm_txn!(node);
 504         }
 505
 506         lock_fundings!(nodes);
 507
 508         let chan_a = nodes[0].list_usable_channels()[0].short_channel_id.unwrap();
 509         let chan_b = nodes[2].list_usable_channels()[0].short_channel_id.unwrap();
 510
 511         let mut payment_id: u8 = 0;
 512
 513         let mut chan_a_disconnected = false;
 514         let mut chan_b_disconnected = false;
 515         let mut ab_events = Vec::new();
 516         let mut ba_events = Vec::new();
 517         let mut bc_events = Vec::new();
 518         let mut cb_events = Vec::new();
 519
 520         let mut node_a_ser = VecWriter(Vec::new());
 521         nodes[0].write(&mut node_a_ser).unwrap();
 522         let mut node_b_ser = VecWriter(Vec::new());
 523         nodes[1].write(&mut node_b_ser).unwrap();
 524         let mut node_c_ser = VecWriter(Vec::new());
 525         nodes[2].write(&mut node_c_ser).unwrap();
 526
 527         macro_rules! test_return {
 528                 () => { {
 529                         assert_eq!(nodes[0].list_channels().len(), 1);
 530                         assert_eq!(nodes[1].list_channels().len(), 2);
 531                         assert_eq!(nodes[2].list_channels().len(), 1);
 532                         return;
 533                 } }
 534         }
 535
 536         let mut read_pos = 0;
 537         macro_rules! get_slice {
 538                 ($len: expr) => {
 539                         {
 540                                 let slice_len = $len as usize;
 541                                 if data.len() < read_pos + slice_len {
 542                                         test_return!();
 543                                 }
 544                                 read_pos += slice_len;
 545                                 &data[read_pos - slice_len..read_pos]
 546                         }
 547                 }
 548         }
 549
 550         loop {
 551                 // Push any events from Node B onto ba_events and bc_events
 552                 macro_rules! push_excess_b_events {
 553                         ($excess_events: expr, $expect_drop_node: expr) => { {
 554                                 let a_id = nodes[0].get_our_node_id();
 555                                 let expect_drop_node: Option<usize> = $expect_drop_node;
 556                                 let expect_drop_id = if let Some(id) = expect_drop_node { Some(nodes[id].get_our_node_id()) } else { None };
 557                                 for event in $excess_events {
 558                                         let push_a = match event {
 559                                                 events::MessageSendEvent::UpdateHTLCs { ref node_id, .. } => {
 560                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 561                                                         *node_id == a_id
 562                                                 },
 563                                                 events::MessageSendEvent::SendRevokeAndACK { ref node_id, .. } => {
 564                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 565                                                         *node_id == a_id
 566                                                 },
 567                                                 events::MessageSendEvent::SendChannelReestablish { ref node_id, .. } => {
 568                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 569                                                         *node_id == a_id
 570                                                 },
 571                                                 events::MessageSendEvent::SendFundingLocked { .. } => continue,
 572                                                 events::MessageSendEvent::SendAnnouncementSignatures { .. } => continue,
 573                                                 events::MessageSendEvent::PaymentFailureNetworkUpdate { .. } => continue,
 574                                                 events::MessageSendEvent::SendChannelUpdate { ref node_id, ref msg } => {
 575                                                         assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 576                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 577                                                         *node_id == a_id
 578                                                 },
 579                                                 _ => panic!("Unhandled message event {:?}", event),
 580                                         };
 581                                         if push_a { ba_events.push(event); } else { bc_events.push(event); }
 582                                 }
 583                         } }
 584                 }
 585
 586                 // While delivering messages, we select across three possible message selection processes
 587                 // to ensure we get as much coverage as possible. See the individual enum variants for more
 588                 // details.
 589                 #[derive(PartialEq)]
 590                 enum ProcessMessages {
 591                         /// Deliver all available messages, including fetching any new messages from
 592                         /// `get_and_clear_pending_msg_events()` (which may have side effects).
 593                         AllMessages,
 594                         /// Call `get_and_clear_pending_msg_events()` first, and then deliver up to one
 595                         /// message (which may already be queued).
 596                         OneMessage,
 597                         /// Deliver up to one already-queued message. This avoids any potential side-effects
 598                         /// of `get_and_clear_pending_msg_events()` (eg freeing the HTLC holding cell), which
 599                         /// provides potentially more coverage.
 600                         OnePendingMessage,
 601                 }
 602
 603                 macro_rules! process_msg_events {
 604                         ($node: expr, $corrupt_forward: expr, $limit_events: expr) => { {
 605                                 let mut events = if $node == 1 {
 606                                         let mut new_events = Vec::new();
 607                                         mem::swap(&mut new_events, &mut ba_events);
 608                                         new_events.extend_from_slice(&bc_events[..]);
 609                                         bc_events.clear();
 610                                         new_events
 611                                 } else if $node == 0 {
 612                                         let mut new_events = Vec::new();
 613                                         mem::swap(&mut new_events, &mut ab_events);
 614                                         new_events
 615                                 } else {
 616                                         let mut new_events = Vec::new();
 617                                         mem::swap(&mut new_events, &mut cb_events);
 618                                         new_events
 619                                 };
 620                                 let mut new_events = Vec::new();
 621                                 if $limit_events != ProcessMessages::OnePendingMessage {
 622                                         new_events = nodes[$node].get_and_clear_pending_msg_events();
 623                                 }
 624                                 let mut had_events = false;
 625                                 let mut events_iter = events.drain(..).chain(new_events.drain(..));
 626                                 let mut extra_ev = None;
 627                                 for event in &mut events_iter {
 628                                         had_events = true;
 629                                         match event {
 630                                                 events::MessageSendEvent::UpdateHTLCs { node_id, updates: CommitmentUpdate { update_add_htlcs, update_fail_htlcs, update_fulfill_htlcs, update_fail_malformed_htlcs, update_fee, commitment_signed } } => {
 631                                                         for dest in nodes.iter() {
 632                                                                 if dest.get_our_node_id() == node_id {
 633                                                                         assert!(update_fee.is_none());
 634                                                                         for update_add in update_add_htlcs.iter() {
 635                                                                                 if !$corrupt_forward {
 636                                                                                         dest.handle_update_add_htlc(&nodes[$node].get_our_node_id(), update_add);
 637                                                                                 } else {
 638                                                                                         // Corrupt the update_add_htlc message so that its HMAC
 639                                                                                         // check will fail and we generate a
 640                                                                                         // update_fail_malformed_htlc instead of an
 641                                                                                         // update_fail_htlc as we do when we reject a payment.
 642                                                                                         let mut msg_ser = update_add.encode();
 643                                                                                         msg_ser[1000] ^= 0xff;
 644                                                                                         let new_msg = UpdateAddHTLC::read(&mut Cursor::new(&msg_ser)).unwrap();
 645                                                                                         dest.handle_update_add_htlc(&nodes[$node].get_our_node_id(), &new_msg);
 646                                                                                 }
 647                                                                         }
 648                                                                         for update_fulfill in update_fulfill_htlcs.iter() {
 649                                                                                 dest.handle_update_fulfill_htlc(&nodes[$node].get_our_node_id(), update_fulfill);
 650                                                                         }
 651                                                                         for update_fail in update_fail_htlcs.iter() {
 652                                                                                 dest.handle_update_fail_htlc(&nodes[$node].get_our_node_id(), update_fail);
 653                                                                         }
 654                                                                         for update_fail_malformed in update_fail_malformed_htlcs.iter() {
 655                                                                                 dest.handle_update_fail_malformed_htlc(&nodes[$node].get_our_node_id(), update_fail_malformed);
 656                                                                         }
 657                                                                         let processed_change = !update_add_htlcs.is_empty() || !update_fulfill_htlcs.is_empty() ||
 658                                                                                 !update_fail_htlcs.is_empty() || !update_fail_malformed_htlcs.is_empty();
 659                                                                         if $limit_events != ProcessMessages::AllMessages && processed_change {
 660                                                                                 // If we only want to process some messages, don't deliver the CS until later.
 661                                                                                 extra_ev = Some(events::MessageSendEvent::UpdateHTLCs { node_id, updates: CommitmentUpdate {
 662                                                                                         update_add_htlcs: Vec::new(),
 663                                                                                         update_fail_htlcs: Vec::new(),
 664                                                                                         update_fulfill_htlcs: Vec::new(),
 665                                                                                         update_fail_malformed_htlcs: Vec::new(),
 666                                                                                         update_fee: None,
 667                                                                                         commitment_signed
 668                                                                                 } });
 669                                                                                 break;
 670                                                                         }
 671                                                                         dest.handle_commitment_signed(&nodes[$node].get_our_node_id(), &commitment_signed);
 672                                                                         break;
 673                                                                 }
 674                                                         }
 675                                                 },
 676                                                 events::MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
 677                                                         for dest in nodes.iter() {
 678                                                                 if dest.get_our_node_id() == *node_id {
 679                                                                         dest.handle_revoke_and_ack(&nodes[$node].get_our_node_id(), msg);
 680                                                                 }
 681                                                         }
 682                                                 },
 683                                                 events::MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
 684                                                         for dest in nodes.iter() {
 685                                                                 if dest.get_our_node_id() == *node_id {
 686                                                                         dest.handle_channel_reestablish(&nodes[$node].get_our_node_id(), msg);
 687                                                                 }
 688                                                         }
 689                                                 },
 690                                                 events::MessageSendEvent::SendFundingLocked { .. } => {
 691                                                         // Can be generated as a reestablish response
 692                                                 },
 693                                                 events::MessageSendEvent::SendAnnouncementSignatures { .. } => {
 694                                                         // Can be generated as a reestablish response
 695                                                 },
 696                                                 events::MessageSendEvent::PaymentFailureNetworkUpdate { .. } => {
 697                                                         // Can be generated due to a payment forward being rejected due to a
 698                                                         // channel having previously failed a monitor update
 699                                                 },
 700                                                 events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 701                                                         // When we reconnect we will resend a channel_update to make sure our
 702                                                         // counterparty has the latest parameters for receiving payments
 703                                                         // through us. We do, however, check that the message does not include
 704                                                         // the "disabled" bit, as we should never ever have a channel which is
 705                                                         // disabled when we send such an update (or it may indicate channel
 706                                                         // force-close which we should detect as an error).
 707                                                         assert_eq!(msg.contents.flags & 2, 0);
 708                                                 },
 709                                                 _ => panic!("Unhandled message event {:?}", event),
 710                                         }
 711                                         if $limit_events != ProcessMessages::AllMessages {
 712                                                 break;
 713                                         }
 714                                 }
 715                                 if $node == 1 {
 716                                         push_excess_b_events!(extra_ev.into_iter().chain(events_iter), None);
 717                                 } else if $node == 0 {
 718                                         if let Some(ev) = extra_ev { ab_events.push(ev); }
 719                                         for event in events_iter { ab_events.push(event); }
 720                                 } else {
 721                                         if let Some(ev) = extra_ev { cb_events.push(ev); }
 722                                         for event in events_iter { cb_events.push(event); }
 723                                 }
 724                                 had_events
 725                         } }
 726                 }
 727
 728                 macro_rules! drain_msg_events_on_disconnect {
 729                         ($counterparty_id: expr) => { {
 730                                 if $counterparty_id == 0 {
 731                                         for event in nodes[0].get_and_clear_pending_msg_events() {
 732                                                 match event {
 733                                                         events::MessageSendEvent::UpdateHTLCs { .. } => {},
 734                                                         events::MessageSendEvent::SendRevokeAndACK { .. } => {},
 735                                                         events::MessageSendEvent::SendChannelReestablish { .. } => {},
 736                                                         events::MessageSendEvent::SendFundingLocked { .. } => {},
 737                                                         events::MessageSendEvent::SendAnnouncementSignatures { .. } => {},
 738                                                         events::MessageSendEvent::PaymentFailureNetworkUpdate { .. } => {},
 739                                                         events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 740                                                                 assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 741                                                         },
 742                                                         _ => panic!("Unhandled message event"),
 743                                                 }
 744                                         }
 745                                         push_excess_b_events!(nodes[1].get_and_clear_pending_msg_events().drain(..), Some(0));
 746                                         ab_events.clear();
 747                                         ba_events.clear();
 748                                 } else {
 749                                         for event in nodes[2].get_and_clear_pending_msg_events() {
 750                                                 match event {
 751                                                         events::MessageSendEvent::UpdateHTLCs { .. } => {},
 752                                                         events::MessageSendEvent::SendRevokeAndACK { .. } => {},
 753                                                         events::MessageSendEvent::SendChannelReestablish { .. } => {},
 754                                                         events::MessageSendEvent::SendFundingLocked { .. } => {},
 755                                                         events::MessageSendEvent::SendAnnouncementSignatures { .. } => {},
 756                                                         events::MessageSendEvent::PaymentFailureNetworkUpdate { .. } => {},
 757                                                         events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 758                                                                 assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 759                                                         },
 760                                                         _ => panic!("Unhandled message event"),
 761                                                 }
 762                                         }
 763                                         push_excess_b_events!(nodes[1].get_and_clear_pending_msg_events().drain(..), Some(2));
 764                                         bc_events.clear();
 765                                         cb_events.clear();
 766                                 }
 767                         } }
 768                 }
 769
 770                 macro_rules! process_events {
 771                         ($node: expr, $fail: expr) => { {
 772                                 // In case we get 256 payments we may have a hash collision, resulting in the
 773                                 // second claim/fail call not finding the duplicate-hash HTLC, so we have to
 774                                 // deduplicate the calls here.
 775                                 let mut claim_set = HashSet::new();
 776                                 let mut events = nodes[$node].get_and_clear_pending_events();
 777                                 // Sort events so that PendingHTLCsForwardable get processed last. This avoids a
 778                                 // case where we first process a PendingHTLCsForwardable, then claim/fail on a
 779                                 // PaymentReceived, claiming/failing two HTLCs, but leaving a just-generated
 780                                 // PaymentReceived event for the second HTLC in our pending_events (and breaking
 781                                 // our claim_set deduplication).
 782                                 events.sort_by(|a, b| {
 783                                         if let events::Event::PaymentReceived { .. } = a {
 784                                                 if let events::Event::PendingHTLCsForwardable { .. } = b {
 785                                                         Ordering::Less
 786                                                 } else { Ordering::Equal }
 787                                         } else if let events::Event::PendingHTLCsForwardable { .. } = a {
 788                                                 if let events::Event::PaymentReceived { .. } = b {
 789                                                         Ordering::Greater
 790                                                 } else { Ordering::Equal }
 791                                         } else { Ordering::Equal }
 792                                 });
 793                                 let had_events = !events.is_empty();
 794                                 for event in events.drain(..) {
 795                                         match event {
 796                                                 events::Event::PaymentReceived { payment_hash, .. } => {
 797                                                         if claim_set.insert(payment_hash.0) {
 798                                                                 if $fail {
 799                                                                         assert!(nodes[$node].fail_htlc_backwards(&payment_hash));
 800                                                                 } else {
 801                                                                         assert!(nodes[$node].claim_funds(PaymentPreimage(payment_hash.0)));
 802                                                                 }
 803                                                         }
 804                                                 },
 805                                                 events::Event::PaymentSent { .. } => {},
 806                                                 events::Event::PaymentFailed { .. } => {},
 807                                                 events::Event::PendingHTLCsForwardable { .. } => {
 808                                                         nodes[$node].process_pending_htlc_forwards();
 809                                                 },
 810                                                 _ => panic!("Unhandled event"),
 811                                         }
 812                                 }
 813                                 had_events
 814                         } }
 815                 }
 816
 817                 match get_slice!(1)[0] {
 818                         // In general, we keep related message groups close together in binary form, allowing
 819                         // bit-twiddling mutations to have similar effects. This is probably overkill, but no
 820                         // harm in doing so.
 821
 822                         0x00 => *monitor_a.update_ret.lock().unwrap() = Err(ChannelMonitorUpdateErr::TemporaryFailure),
 823                         0x01 => *monitor_b.update_ret.lock().unwrap() = Err(ChannelMonitorUpdateErr::TemporaryFailure),
 824                         0x02 => *monitor_c.update_ret.lock().unwrap() = Err(ChannelMonitorUpdateErr::TemporaryFailure),
 825                         0x04 => *monitor_a.update_ret.lock().unwrap() = Ok(()),
 826                         0x05 => *monitor_b.update_ret.lock().unwrap() = Ok(()),
 827                         0x06 => *monitor_c.update_ret.lock().unwrap() = Ok(()),
 828
 829                         0x08 => {
 830                                 if let Some((id, _)) = monitor_a.latest_monitors.lock().unwrap().get(&chan_1_funding) {
 831                                         nodes[0].channel_monitor_updated(&chan_1_funding, *id);
 832                                 }
 833                         },
 834                         0x09 => {
 835                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_1_funding) {
 836                                         nodes[1].channel_monitor_updated(&chan_1_funding, *id);
 837                                 }
 838                         },
 839                         0x0a => {
 840                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_2_funding) {
 841                                         nodes[1].channel_monitor_updated(&chan_2_funding, *id);
 842                                 }
 843                         },
 844                         0x0b => {
 845                                 if let Some((id, _)) = monitor_c.latest_monitors.lock().unwrap().get(&chan_2_funding) {
 846                                         nodes[2].channel_monitor_updated(&chan_2_funding, *id);
 847                                 }
 848                         },
 849
 850                         0x0c => {
 851                                 if !chan_a_disconnected {
 852                                         nodes[0].peer_disconnected(&nodes[1].get_our_node_id(), false);
 853                                         nodes[1].peer_disconnected(&nodes[0].get_our_node_id(), false);
 854                                         chan_a_disconnected = true;
 855                                         drain_msg_events_on_disconnect!(0);
 856                                 }
 857                         },
 858                         0x0d => {
 859                                 if !chan_b_disconnected {
 860                                         nodes[1].peer_disconnected(&nodes[2].get_our_node_id(), false);
 861                                         nodes[2].peer_disconnected(&nodes[1].get_our_node_id(), false);
 862                                         chan_b_disconnected = true;
 863                                         drain_msg_events_on_disconnect!(2);
 864                                 }
 865                         },
 866                         0x0e => {
 867                                 if chan_a_disconnected {
 868                                         nodes[0].peer_connected(&nodes[1].get_our_node_id(), &Init { features: InitFeatures::known() });
 869                                         nodes[1].peer_connected(&nodes[0].get_our_node_id(), &Init { features: InitFeatures::known() });
 870                                         chan_a_disconnected = false;
 871                                 }
 872                         },
 873                         0x0f => {
 874                                 if chan_b_disconnected {
 875                                         nodes[1].peer_connected(&nodes[2].get_our_node_id(), &Init { features: InitFeatures::known() });
 876                                         nodes[2].peer_connected(&nodes[1].get_our_node_id(), &Init { features: InitFeatures::known() });
 877                                         chan_b_disconnected = false;
 878                                 }
 879                         },
 880
 881                         0x10 => { process_msg_events!(0, true, ProcessMessages::AllMessages); },
 882                         0x11 => { process_msg_events!(0, false, ProcessMessages::AllMessages); },
 883                         0x12 => { process_msg_events!(0, true, ProcessMessages::OneMessage); },
 884                         0x13 => { process_msg_events!(0, false, ProcessMessages::OneMessage); },
 885                         0x14 => { process_msg_events!(0, true, ProcessMessages::OnePendingMessage); },
 886                         0x15 => { process_msg_events!(0, false, ProcessMessages::OnePendingMessage); },
 887
 888                         0x16 => { process_events!(0, true); },
 889                         0x17 => { process_events!(0, false); },
 890
 891                         0x18 => { process_msg_events!(1, true, ProcessMessages::AllMessages); },
 892                         0x19 => { process_msg_events!(1, false, ProcessMessages::AllMessages); },
 893                         0x1a => { process_msg_events!(1, true, ProcessMessages::OneMessage); },
 894                         0x1b => { process_msg_events!(1, false, ProcessMessages::OneMessage); },
 895                         0x1c => { process_msg_events!(1, true, ProcessMessages::OnePendingMessage); },
 896                         0x1d => { process_msg_events!(1, false, ProcessMessages::OnePendingMessage); },
 897
 898                         0x1e => { process_events!(1, true); },
 899                         0x1f => { process_events!(1, false); },
 900
 901                         0x20 => { process_msg_events!(2, true, ProcessMessages::AllMessages); },
 902                         0x21 => { process_msg_events!(2, false, ProcessMessages::AllMessages); },
 903                         0x22 => { process_msg_events!(2, true, ProcessMessages::OneMessage); },
 904                         0x23 => { process_msg_events!(2, false, ProcessMessages::OneMessage); },
 905                         0x24 => { process_msg_events!(2, true, ProcessMessages::OnePendingMessage); },
 906                         0x25 => { process_msg_events!(2, false, ProcessMessages::OnePendingMessage); },
 907
 908                         0x26 => { process_events!(2, true); },
 909                         0x27 => { process_events!(2, false); },
 910
 911                         0x2c => {
 912                                 if !chan_a_disconnected {
 913                                         nodes[1].peer_disconnected(&nodes[0].get_our_node_id(), false);
 914                                         chan_a_disconnected = true;
 915                                         drain_msg_events_on_disconnect!(0);
 916                                 }
 917                                 if monitor_a.should_update_manager.load(atomic::Ordering::Relaxed) {
 918                                         node_a_ser.0.clear();
 919                                         nodes[0].write(&mut node_a_ser).unwrap();
 920                                 }
 921                                 let (new_node_a, new_monitor_a) = reload_node!(node_a_ser, 0, monitor_a, keys_manager_a);
 922                                 nodes[0] = new_node_a;
 923                                 monitor_a = new_monitor_a;
 924                         },
 925                         0x2d => {
 926                                 if !chan_a_disconnected {
 927                                         nodes[0].peer_disconnected(&nodes[1].get_our_node_id(), false);
 928                                         chan_a_disconnected = true;
 929                                         nodes[0].get_and_clear_pending_msg_events();
 930                                         ab_events.clear();
 931                                         ba_events.clear();
 932                                 }
 933                                 if !chan_b_disconnected {
 934                                         nodes[2].peer_disconnected(&nodes[1].get_our_node_id(), false);
 935                                         chan_b_disconnected = true;
 936                                         nodes[2].get_and_clear_pending_msg_events();
 937                                         bc_events.clear();
 938                                         cb_events.clear();
 939                                 }
 940                                 let (new_node_b, new_monitor_b) = reload_node!(node_b_ser, 1, monitor_b, keys_manager_b);
 941                                 nodes[1] = new_node_b;
 942                                 monitor_b = new_monitor_b;
 943                         },
 944                         0x2e => {
 945                                 if !chan_b_disconnected {
 946                                         nodes[1].peer_disconnected(&nodes[2].get_our_node_id(), false);
 947                                         chan_b_disconnected = true;
 948                                         drain_msg_events_on_disconnect!(2);
 949                                 }
 950                                 if monitor_c.should_update_manager.load(atomic::Ordering::Relaxed) {
 951                                         node_c_ser.0.clear();
 952                                         nodes[2].write(&mut node_c_ser).unwrap();
 953                                 }
 954                                 let (new_node_c, new_monitor_c) = reload_node!(node_c_ser, 2, monitor_c, keys_manager_c);
 955                                 nodes[2] = new_node_c;
 956                                 monitor_c = new_monitor_c;
 957                         },
 958
 959                         // 1/10th the channel size:
 960                         0x30 => { send_payment(&nodes[0], &nodes[1], chan_a, 10_000_000, &mut payment_id); },
 961                         0x31 => { send_payment(&nodes[1], &nodes[0], chan_a, 10_000_000, &mut payment_id); },
 962                         0x32 => { send_payment(&nodes[1], &nodes[2], chan_b, 10_000_000, &mut payment_id); },
 963                         0x33 => { send_payment(&nodes[2], &nodes[1], chan_b, 10_000_000, &mut payment_id); },
 964                         0x34 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10_000_000, &mut payment_id); },
 965                         0x35 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10_000_000, &mut payment_id); },
 966
 967                         0x38 => { send_payment(&nodes[0], &nodes[1], chan_a, 1_000_000, &mut payment_id); },
 968                         0x39 => { send_payment(&nodes[1], &nodes[0], chan_a, 1_000_000, &mut payment_id); },
 969                         0x3a => { send_payment(&nodes[1], &nodes[2], chan_b, 1_000_000, &mut payment_id); },
 970                         0x3b => { send_payment(&nodes[2], &nodes[1], chan_b, 1_000_000, &mut payment_id); },
 971                         0x3c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1_000_000, &mut payment_id); },
 972                         0x3d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1_000_000, &mut payment_id); },
 973
 974                         0x40 => { send_payment(&nodes[0], &nodes[1], chan_a, 100_000, &mut payment_id); },
 975                         0x41 => { send_payment(&nodes[1], &nodes[0], chan_a, 100_000, &mut payment_id); },
 976                         0x42 => { send_payment(&nodes[1], &nodes[2], chan_b, 100_000, &mut payment_id); },
 977                         0x43 => { send_payment(&nodes[2], &nodes[1], chan_b, 100_000, &mut payment_id); },
 978                         0x44 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 100_000, &mut payment_id); },
 979                         0x45 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 100_000, &mut payment_id); },
 980
 981                         0x48 => { send_payment(&nodes[0], &nodes[1], chan_a, 10_000, &mut payment_id); },
 982                         0x49 => { send_payment(&nodes[1], &nodes[0], chan_a, 10_000, &mut payment_id); },
 983                         0x4a => { send_payment(&nodes[1], &nodes[2], chan_b, 10_000, &mut payment_id); },
 984                         0x4b => { send_payment(&nodes[2], &nodes[1], chan_b, 10_000, &mut payment_id); },
 985                         0x4c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10_000, &mut payment_id); },
 986                         0x4d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10_000, &mut payment_id); },
 987
 988                         0x50 => { send_payment(&nodes[0], &nodes[1], chan_a, 1_000, &mut payment_id); },
 989                         0x51 => { send_payment(&nodes[1], &nodes[0], chan_a, 1_000, &mut payment_id); },
 990                         0x52 => { send_payment(&nodes[1], &nodes[2], chan_b, 1_000, &mut payment_id); },
 991                         0x53 => { send_payment(&nodes[2], &nodes[1], chan_b, 1_000, &mut payment_id); },
 992                         0x54 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1_000, &mut payment_id); },
 993                         0x55 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1_000, &mut payment_id); },
 994
 995                         0x58 => { send_payment(&nodes[0], &nodes[1], chan_a, 100, &mut payment_id); },
 996                         0x59 => { send_payment(&nodes[1], &nodes[0], chan_a, 100, &mut payment_id); },
 997                         0x5a => { send_payment(&nodes[1], &nodes[2], chan_b, 100, &mut payment_id); },
 998                         0x5b => { send_payment(&nodes[2], &nodes[1], chan_b, 100, &mut payment_id); },
 999                         0x5c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 100, &mut payment_id); },
1000                         0x5d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 100, &mut payment_id); },
1001
1002                         0x60 => { send_payment(&nodes[0], &nodes[1], chan_a, 10, &mut payment_id); },
1003                         0x61 => { send_payment(&nodes[1], &nodes[0], chan_a, 10, &mut payment_id); },
1004                         0x62 => { send_payment(&nodes[1], &nodes[2], chan_b, 10, &mut payment_id); },
1005                         0x63 => { send_payment(&nodes[2], &nodes[1], chan_b, 10, &mut payment_id); },
1006                         0x64 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10, &mut payment_id); },
1007                         0x65 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10, &mut payment_id); },
1008
1009                         0x68 => { send_payment(&nodes[0], &nodes[1], chan_a, 1, &mut payment_id); },
1010                         0x69 => { send_payment(&nodes[1], &nodes[0], chan_a, 1, &mut payment_id); },
1011                         0x6a => { send_payment(&nodes[1], &nodes[2], chan_b, 1, &mut payment_id); },
1012                         0x6b => { send_payment(&nodes[2], &nodes[1], chan_b, 1, &mut payment_id); },
1013                         0x6c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1, &mut payment_id); },
1014                         0x6d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1, &mut payment_id); },
1015
1016                         0xff => {
1017                                 // Test that no channel is in a stuck state where neither party can send funds even
1018                                 // after we resolve all pending events.
1019                                 // First make sure there are no pending monitor updates, resetting the error state
1020                                 // and calling channel_monitor_updated for each monitor.
1021                                 *monitor_a.update_ret.lock().unwrap() = Ok(());
1022                                 *monitor_b.update_ret.lock().unwrap() = Ok(());
1023                                 *monitor_c.update_ret.lock().unwrap() = Ok(());
1024
1025                                 if let Some((id, _)) = monitor_a.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1026                                         nodes[0].channel_monitor_updated(&chan_1_funding, *id);
1027                                 }
1028                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1029                                         nodes[1].channel_monitor_updated(&chan_1_funding, *id);
1030                                 }
1031                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1032                                         nodes[1].channel_monitor_updated(&chan_2_funding, *id);
1033                                 }
1034                                 if let Some((id, _)) = monitor_c.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1035                                         nodes[2].channel_monitor_updated(&chan_2_funding, *id);
1036                                 }
1037
1038                                 // Next, make sure peers are all connected to each other
1039                                 if chan_a_disconnected {
1040                                         nodes[0].peer_connected(&nodes[1].get_our_node_id(), &Init { features: InitFeatures::known() });
1041                                         nodes[1].peer_connected(&nodes[0].get_our_node_id(), &Init { features: InitFeatures::known() });
1042                                         chan_a_disconnected = false;
1043                                 }
1044                                 if chan_b_disconnected {
1045                                         nodes[1].peer_connected(&nodes[2].get_our_node_id(), &Init { features: InitFeatures::known() });
1046                                         nodes[2].peer_connected(&nodes[1].get_our_node_id(), &Init { features: InitFeatures::known() });
1047                                         chan_b_disconnected = false;
1048                                 }
1049
1050                                 for i in 0..std::usize::MAX {
1051                                         if i == 100 { panic!("It may take may iterations to settle the state, but it should not take forever"); }
1052                                         // Then, make sure any current forwards make their way to their destination
1053                                         if process_msg_events!(0, false, ProcessMessages::AllMessages) { continue; }
1054                                         if process_msg_events!(1, false, ProcessMessages::AllMessages) { continue; }
1055                                         if process_msg_events!(2, false, ProcessMessages::AllMessages) { continue; }
1056                                         // ...making sure any pending PendingHTLCsForwardable events are handled and
1057                                         // payments claimed.
1058                                         if process_events!(0, false) { continue; }
1059                                         if process_events!(1, false) { continue; }
1060                                         if process_events!(2, false) { continue; }
1061                                         break;
1062                                 }
1063
1064                                 // Finally, make sure that at least one end of each channel can make a substantial payment.
1065                                 assert!(
1066                                         send_payment(&nodes[0], &nodes[1], chan_a, 10_000_000, &mut payment_id) ||
1067                                         send_payment(&nodes[1], &nodes[0], chan_a, 10_000_000, &mut payment_id));
1068                                 assert!(
1069                                         send_payment(&nodes[1], &nodes[2], chan_b, 10_000_000, &mut payment_id) ||
1070                                         send_payment(&nodes[2], &nodes[1], chan_b, 10_000_000, &mut payment_id));
1071                         },
1072                         _ => test_return!(),
1073                 }
1074
1075                 node_a_ser.0.clear();
1076                 nodes[0].write(&mut node_a_ser).unwrap();
1077                 monitor_a.should_update_manager.store(false, atomic::Ordering::Relaxed);
1078                 node_b_ser.0.clear();
1079                 nodes[1].write(&mut node_b_ser).unwrap();
1080                 monitor_b.should_update_manager.store(false, atomic::Ordering::Relaxed);
1081                 node_c_ser.0.clear();
1082                 nodes[2].write(&mut node_c_ser).unwrap();
1083                 monitor_c.should_update_manager.store(false, atomic::Ordering::Relaxed);
1084         }
1085 }
1086
1087 pub fn chanmon_consistency_test<Out: test_logger::Output>(data: &[u8], out: Out) {
1088         do_test(data, out);
1089 }
1090
1091 #[no_mangle]
1092 pub extern "C" fn chanmon_consistency_run(data: *const u8, datalen: usize) {
1093         do_test(unsafe { std::slice::from_raw_parts(data, datalen) }, test_logger::DevNull{});
1094 }