_ 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::TxMerkleNode;
  22 use bitcoin::blockdata::block::BlockHeader;
  23 use bitcoin::blockdata::constants::genesis_block;
  24 use bitcoin::blockdata::transaction::{Transaction, TxOut};
  25 use bitcoin::blockdata::script::{Builder, Script};
  26 use bitcoin::blockdata::opcodes;
  27 use bitcoin::blockdata::locktime::PackedLockTime;
  28 use bitcoin::network::constants::Network;
  29
  30 use bitcoin::hashes::Hash as TraitImport;
  31 use bitcoin::hashes::sha256::Hash as Sha256;
  32 use bitcoin::hash_types::{BlockHash, WPubkeyHash};
  33
  34 use lightning::chain;
  35 use lightning::chain::{BestBlock, ChannelMonitorUpdateStatus, chainmonitor, channelmonitor, Confirm, Watch};
  36 use lightning::chain::channelmonitor::{ChannelMonitor, MonitorEvent};
  37 use lightning::chain::transaction::OutPoint;
  38 use lightning::chain::chaininterface::{BroadcasterInterface, ConfirmationTarget, FeeEstimator};
  39 use lightning::chain::keysinterface::{KeyMaterial, InMemorySigner, Recipient, EntropySource, NodeSigner, SignerProvider};
  40 use lightning::ln::{PaymentHash, PaymentPreimage, PaymentSecret};
  41 use lightning::ln::channelmanager::{self, ChainParameters, ChannelDetails, ChannelManager, PaymentSendFailure, ChannelManagerReadArgs, PaymentId};
  42 use lightning::ln::channel::FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE;
  43 use lightning::ln::msgs::{self, CommitmentUpdate, ChannelMessageHandler, DecodeError, UpdateAddHTLC, Init};
  44 use lightning::ln::script::ShutdownScript;
  45 use lightning::util::enforcing_trait_impls::{EnforcingSigner, EnforcementState};
  46 use lightning::util::errors::APIError;
  47 use lightning::util::events;
  48 use lightning::util::logger::Logger;
  49 use lightning::util::config::UserConfig;
  50 use lightning::util::events::MessageSendEventsProvider;
  51 use lightning::util::ser::{Readable, ReadableArgs, Writeable, Writer};
  52 use lightning::routing::router::{InFlightHtlcs, Route, RouteHop, RouteParameters, Router};
  53
  54 use crate::utils::test_logger::{self, Output};
  55 use crate::utils::test_persister::TestPersister;
  56
  57 use bitcoin::secp256k1::{PublicKey, SecretKey, Scalar};
  58 use bitcoin::secp256k1::ecdh::SharedSecret;
  59 use bitcoin::secp256k1::ecdsa::RecoverableSignature;
  60 use bitcoin::secp256k1::Secp256k1;
  61
  62 use std::mem;
  63 use std::cmp::{self, Ordering};
  64 use std::collections::{HashSet, hash_map, HashMap};
  65 use std::sync::{Arc,Mutex};
  66 use std::sync::atomic;
  67 use std::io::Cursor;
  68 use bitcoin::bech32::u5;
  69
  70 const MAX_FEE: u32 = 10_000;
  71 struct FuzzEstimator {
  72         ret_val: atomic::AtomicU32,
  73 }
  74 impl FeeEstimator for FuzzEstimator {
  75         fn get_est_sat_per_1000_weight(&self, conf_target: ConfirmationTarget) -> u32 {
  76                 // We force-close channels if our counterparty sends us a feerate which is a small multiple
  77                 // of our HighPriority fee estimate or smaller than our Background fee estimate. Thus, we
  78                 // always return a HighPriority feerate here which is >= the maximum Normal feerate and a
  79                 // Background feerate which is <= the minimum Normal feerate.
  80                 match conf_target {
  81                         ConfirmationTarget::HighPriority => MAX_FEE,
  82                         ConfirmationTarget::Background => 253,
  83                         ConfirmationTarget::Normal => cmp::min(self.ret_val.load(atomic::Ordering::Acquire), MAX_FEE),
  84                 }
  85         }
  86 }
  87
  88 struct FuzzRouter {}
  89
  90 impl Router for FuzzRouter {
  91         fn find_route(
  92                 &self, _payer: &PublicKey, _params: &RouteParameters, _first_hops: Option<&[&ChannelDetails]>,
  93                 _inflight_htlcs: &InFlightHtlcs
  94         ) -> Result<Route, msgs::LightningError> {
  95                 Err(msgs::LightningError {
  96                         err: String::from("Not implemented"),
  97                         action: msgs::ErrorAction::IgnoreError
  98                 })
  99         }
 100         fn notify_payment_path_failed(&self, _path: &[&RouteHop], _short_channel_id: u64) {}
 101         fn notify_payment_path_successful(&self, _path: &[&RouteHop]) {}
 102         fn notify_payment_probe_successful(&self, _path: &[&RouteHop]) {}
 103         fn notify_payment_probe_failed(&self, _path: &[&RouteHop], _short_channel_id: u64) {}
 104 }
 105
 106 pub struct TestBroadcaster {}
 107 impl BroadcasterInterface for TestBroadcaster {
 108         fn broadcast_transaction(&self, _tx: &Transaction) { }
 109 }
 110
 111 pub struct VecWriter(pub Vec<u8>);
 112 impl Writer for VecWriter {
 113         fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
 114                 self.0.extend_from_slice(buf);
 115                 Ok(())
 116         }
 117 }
 118
 119 struct TestChainMonitor {
 120         pub logger: Arc<dyn Logger>,
 121         pub keys: Arc<KeyProvider>,
 122         pub persister: Arc<TestPersister>,
 123         pub chain_monitor: Arc<chainmonitor::ChainMonitor<EnforcingSigner, Arc<dyn chain::Filter>, Arc<TestBroadcaster>, Arc<FuzzEstimator>, Arc<dyn Logger>, Arc<TestPersister>>>,
 124         // If we reload a node with an old copy of ChannelMonitors, the ChannelManager deserialization
 125         // logic will automatically force-close our channels for us (as we don't have an up-to-date
 126         // monitor implying we are not able to punish misbehaving counterparties). Because this test
 127         // "fails" if we ever force-close a channel, we avoid doing so, always saving the latest
 128         // fully-serialized monitor state here, as well as the corresponding update_id.
 129         pub latest_monitors: Mutex<HashMap<OutPoint, (u64, Vec<u8>)>>,
 130         pub should_update_manager: atomic::AtomicBool,
 131 }
 132 impl TestChainMonitor {
 133         pub fn new(broadcaster: Arc<TestBroadcaster>, logger: Arc<dyn Logger>, feeest: Arc<FuzzEstimator>, persister: Arc<TestPersister>, keys: Arc<KeyProvider>) -> Self {
 134                 Self {
 135                         chain_monitor: Arc::new(chainmonitor::ChainMonitor::new(None, broadcaster, logger.clone(), feeest, Arc::clone(&persister))),
 136                         logger,
 137                         keys,
 138                         persister,
 139                         latest_monitors: Mutex::new(HashMap::new()),
 140                         should_update_manager: atomic::AtomicBool::new(false),
 141                 }
 142         }
 143 }
 144 impl chain::Watch<EnforcingSigner> for TestChainMonitor {
 145         fn watch_channel(&self, funding_txo: OutPoint, monitor: channelmonitor::ChannelMonitor<EnforcingSigner>) -> chain::ChannelMonitorUpdateStatus {
 146                 let mut ser = VecWriter(Vec::new());
 147                 monitor.write(&mut ser).unwrap();
 148                 if let Some(_) = self.latest_monitors.lock().unwrap().insert(funding_txo, (monitor.get_latest_update_id(), ser.0)) {
 149                         panic!("Already had monitor pre-watch_channel");
 150                 }
 151                 self.should_update_manager.store(true, atomic::Ordering::Relaxed);
 152                 self.chain_monitor.watch_channel(funding_txo, monitor)
 153         }
 154
 155         fn update_channel(&self, funding_txo: OutPoint, update: channelmonitor::ChannelMonitorUpdate) -> chain::ChannelMonitorUpdateStatus {
 156                 let mut map_lock = self.latest_monitors.lock().unwrap();
 157                 let mut map_entry = match map_lock.entry(funding_txo) {
 158                         hash_map::Entry::Occupied(entry) => entry,
 159                         hash_map::Entry::Vacant(_) => panic!("Didn't have monitor on update call"),
 160                 };
 161                 let deserialized_monitor = <(BlockHash, channelmonitor::ChannelMonitor<EnforcingSigner>)>::
 162                         read(&mut Cursor::new(&map_entry.get().1), &*self.keys).unwrap().1;
 163                 deserialized_monitor.update_monitor(&update, &&TestBroadcaster{}, &FuzzEstimator { ret_val: atomic::AtomicU32::new(253) }, &self.logger).unwrap();
 164                 let mut ser = VecWriter(Vec::new());
 165                 deserialized_monitor.write(&mut ser).unwrap();
 166                 map_entry.insert((update.update_id, ser.0));
 167                 self.should_update_manager.store(true, atomic::Ordering::Relaxed);
 168                 self.chain_monitor.update_channel(funding_txo, update)
 169         }
 170
 171         fn release_pending_monitor_events(&self) -> Vec<(OutPoint, Vec<MonitorEvent>, Option<PublicKey>)> {
 172                 return self.chain_monitor.release_pending_monitor_events();
 173         }
 174 }
 175
 176 struct KeyProvider {
 177         node_id: u8,
 178         rand_bytes_id: atomic::AtomicU32,
 179         enforcement_states: Mutex<HashMap<[u8;32], Arc<Mutex<EnforcementState>>>>,
 180 }
 181
 182 impl EntropySource for KeyProvider {
 183         fn get_secure_random_bytes(&self) -> [u8; 32] {
 184                 let id = self.rand_bytes_id.fetch_add(1, atomic::Ordering::Relaxed);
 185                 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];
 186                 res[30-4..30].copy_from_slice(&id.to_le_bytes());
 187                 res
 188         }
 189 }
 190
 191 impl NodeSigner for KeyProvider {
 192         fn get_node_secret(&self, _recipient: Recipient) -> Result<SecretKey, ()> {
 193                 Ok(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())
 194         }
 195
 196         fn get_node_id(&self, recipient: Recipient) -> Result<PublicKey, ()> {
 197                 let secp_ctx = Secp256k1::signing_only();
 198                 Ok(PublicKey::from_secret_key(&secp_ctx, &self.get_node_secret(recipient)?))
 199         }
 200
 201         fn ecdh(&self, recipient: Recipient, other_key: &PublicKey, tweak: Option<&Scalar>) -> Result<SharedSecret, ()> {
 202                 let mut node_secret = self.get_node_secret(recipient)?;
 203                 if let Some(tweak) = tweak {
 204                         node_secret = node_secret.mul_tweak(tweak).unwrap();
 205                 }
 206                 Ok(SharedSecret::new(other_key, &node_secret))
 207         }
 208
 209         fn get_inbound_payment_key_material(&self) -> KeyMaterial {
 210                 KeyMaterial([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])
 211         }
 212
 213         fn sign_invoice(&self, _hrp_bytes: &[u8], _invoice_data: &[u5], _recipient: Recipient) -> Result<RecoverableSignature, ()> {
 214                 unreachable!()
 215         }
 216 }
 217
 218 impl SignerProvider for KeyProvider {
 219         type Signer = EnforcingSigner;
 220
 221         fn generate_channel_keys_id(&self, _inbound: bool, _channel_value_satoshis: u64, _user_channel_id: u128) -> [u8; 32] {
 222                 let id = self.rand_bytes_id.fetch_add(1, atomic::Ordering::Relaxed) as u8;
 223                 [id; 32]
 224         }
 225
 226         fn derive_channel_signer(&self, channel_value_satoshis: u64, channel_keys_id: [u8; 32]) -> Self::Signer {
 227                 let secp_ctx = Secp256k1::signing_only();
 228                 let id = channel_keys_id[0];
 229                 let keys = InMemorySigner::new(
 230                         &secp_ctx,
 231                         self.get_node_secret(Recipient::Node).unwrap(),
 232                         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(),
 233                         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(),
 234                         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(),
 235                         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(),
 236                         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(),
 237                         [id, 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],
 238                         channel_value_satoshis,
 239                         channel_keys_id,
 240                 );
 241                 let revoked_commitment = self.make_enforcement_state_cell(keys.commitment_seed);
 242                 EnforcingSigner::new_with_revoked(keys, revoked_commitment, false)
 243         }
 244
 245         fn read_chan_signer(&self, buffer: &[u8]) -> Result<Self::Signer, DecodeError> {
 246                 let mut reader = std::io::Cursor::new(buffer);
 247
 248                 let inner: InMemorySigner = ReadableArgs::read(&mut reader, self.get_node_secret(Recipient::Node).unwrap())?;
 249                 let state = self.make_enforcement_state_cell(inner.commitment_seed);
 250
 251                 Ok(EnforcingSigner {
 252                         inner,
 253                         state,
 254                         disable_revocation_policy_check: false,
 255                 })
 256         }
 257
 258         fn get_destination_script(&self) -> Script {
 259                 let secp_ctx = Secp256k1::signing_only();
 260                 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();
 261                 let our_channel_monitor_claim_key_hash = WPubkeyHash::hash(&PublicKey::from_secret_key(&secp_ctx, &channel_monitor_claim_key).serialize());
 262                 Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0).push_slice(&our_channel_monitor_claim_key_hash[..]).into_script()
 263         }
 264
 265         fn get_shutdown_scriptpubkey(&self) -> ShutdownScript {
 266                 let secp_ctx = Secp256k1::signing_only();
 267                 let secret_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, 3, self.node_id]).unwrap();
 268                 let pubkey_hash = WPubkeyHash::hash(&PublicKey::from_secret_key(&secp_ctx, &secret_key).serialize());
 269                 ShutdownScript::new_p2wpkh(&pubkey_hash)
 270         }
 271 }
 272
 273 impl KeyProvider {
 274         fn make_enforcement_state_cell(&self, commitment_seed: [u8; 32]) -> Arc<Mutex<EnforcementState>> {
 275                 let mut revoked_commitments = self.enforcement_states.lock().unwrap();
 276                 if !revoked_commitments.contains_key(&commitment_seed) {
 277                         revoked_commitments.insert(commitment_seed, Arc::new(Mutex::new(EnforcementState::new())));
 278                 }
 279                 let cell = revoked_commitments.get(&commitment_seed).unwrap();
 280                 Arc::clone(cell)
 281         }
 282 }
 283
 284 #[inline]
 285 fn check_api_err(api_err: APIError) {
 286         match api_err {
 287                 APIError::APIMisuseError { .. } => panic!("We can't misuse the API"),
 288                 APIError::FeeRateTooHigh { .. } => panic!("We can't send too much fee?"),
 289                 APIError::InvalidRoute { .. } => panic!("Our routes should work"),
 290                 APIError::ChannelUnavailable { err } => {
 291                         // Test the error against a list of errors we can hit, and reject
 292                         // all others. If you hit this panic, the list of acceptable errors
 293                         // is probably just stale and you should add new messages here.
 294                         match err.as_str() {
 295                                 "Peer for first hop currently disconnected/pending monitor update!" => {},
 296                                 _ if err.starts_with("Cannot push more than their max accepted HTLCs ") => {},
 297                                 _ if err.starts_with("Cannot send value that would put us over the max HTLC value in flight our peer will accept ") => {},
 298                                 _ if err.starts_with("Cannot send value that would put our balance under counterparty-announced channel reserve value") => {},
 299                                 _ if err.starts_with("Cannot send value that would put counterparty balance under holder-announced channel reserve value") => {},
 300                                 _ if err.starts_with("Cannot send value that would overdraw remaining funds.") => {},
 301                                 _ if err.starts_with("Cannot send value that would not leave enough to pay for fees.") => {},
 302                                 _ if err.starts_with("Cannot send value that would put our exposure to dust HTLCs at") => {},
 303                                 _ => panic!("{}", err),
 304                         }
 305                 },
 306                 APIError::MonitorUpdateInProgress => {
 307                         // We can (obviously) temp-fail a monitor update
 308                 },
 309                 APIError::IncompatibleShutdownScript { .. } => panic!("Cannot send an incompatible shutdown script"),
 310         }
 311 }
 312 #[inline]
 313 fn check_payment_err(send_err: PaymentSendFailure) {
 314         match send_err {
 315                 PaymentSendFailure::ParameterError(api_err) => check_api_err(api_err),
 316                 PaymentSendFailure::PathParameterError(per_path_results) => {
 317                         for res in per_path_results { if let Err(api_err) = res { check_api_err(api_err); } }
 318                 },
 319                 PaymentSendFailure::AllFailedResendSafe(per_path_results) => {
 320                         for api_err in per_path_results { check_api_err(api_err); }
 321                 },
 322                 PaymentSendFailure::PartialFailure { results, .. } => {
 323                         for res in results { if let Err(api_err) = res { check_api_err(api_err); } }
 324                 },
 325                 PaymentSendFailure::DuplicatePayment => panic!(),
 326         }
 327 }
 328
 329 type ChanMan<'a> = ChannelManager<Arc<TestChainMonitor>, Arc<TestBroadcaster>, Arc<KeyProvider>, Arc<FuzzEstimator>, &'a FuzzRouter, Arc<dyn Logger>>;
 330
 331 #[inline]
 332 fn get_payment_secret_hash(dest: &ChanMan, payment_id: &mut u8) -> Option<(PaymentSecret, PaymentHash)> {
 333         let mut payment_hash;
 334         for _ in 0..256 {
 335                 payment_hash = PaymentHash(Sha256::hash(&[*payment_id; 1]).into_inner());
 336                 if let Ok(payment_secret) = dest.create_inbound_payment_for_hash(payment_hash, None, 3600) {
 337                         return Some((payment_secret, payment_hash));
 338                 }
 339                 *payment_id = payment_id.wrapping_add(1);
 340         }
 341         None
 342 }
 343
 344 #[inline]
 345 fn send_payment(source: &ChanMan, dest: &ChanMan, dest_chan_id: u64, amt: u64, payment_id: &mut u8, payment_idx: &mut u64) -> bool {
 346         let (payment_secret, payment_hash) =
 347                 if let Some((secret, hash)) = get_payment_secret_hash(dest, payment_id) { (secret, hash) } else { return true; };
 348         let mut payment_id = [0; 32];
 349         payment_id[0..8].copy_from_slice(&payment_idx.to_ne_bytes());
 350         *payment_idx += 1;
 351         if let Err(err) = source.send_payment(&Route {
 352                 paths: vec![vec![RouteHop {
 353                         pubkey: dest.get_our_node_id(),
 354                         node_features: channelmanager::provided_node_features(),
 355                         short_channel_id: dest_chan_id,
 356                         channel_features: channelmanager::provided_channel_features(),
 357                         fee_msat: amt,
 358                         cltv_expiry_delta: 200,
 359                 }]],
 360                 payment_params: None,
 361         }, payment_hash, &Some(payment_secret), PaymentId(payment_id)) {
 362                 check_payment_err(err);
 363                 false
 364         } else { true }
 365 }
 366 #[inline]
 367 fn send_hop_payment(source: &ChanMan, middle: &ChanMan, middle_chan_id: u64, dest: &ChanMan, dest_chan_id: u64, amt: u64, payment_id: &mut u8, payment_idx: &mut u64) -> bool {
 368         let (payment_secret, payment_hash) =
 369                 if let Some((secret, hash)) = get_payment_secret_hash(dest, payment_id) { (secret, hash) } else { return true; };
 370         let mut payment_id = [0; 32];
 371         payment_id[0..8].copy_from_slice(&payment_idx.to_ne_bytes());
 372         *payment_idx += 1;
 373         if let Err(err) = source.send_payment(&Route {
 374                 paths: vec![vec![RouteHop {
 375                         pubkey: middle.get_our_node_id(),
 376                         node_features: channelmanager::provided_node_features(),
 377                         short_channel_id: middle_chan_id,
 378                         channel_features: channelmanager::provided_channel_features(),
 379                         fee_msat: 50000,
 380                         cltv_expiry_delta: 100,
 381                 },RouteHop {
 382                         pubkey: dest.get_our_node_id(),
 383                         node_features: channelmanager::provided_node_features(),
 384                         short_channel_id: dest_chan_id,
 385                         channel_features: channelmanager::provided_channel_features(),
 386                         fee_msat: amt,
 387                         cltv_expiry_delta: 200,
 388                 }]],
 389                 payment_params: None,
 390         }, payment_hash, &Some(payment_secret), PaymentId(payment_id)) {
 391                 check_payment_err(err);
 392                 false
 393         } else { true }
 394 }
 395
 396 #[inline]
 397 pub fn do_test<Out: Output>(data: &[u8], underlying_out: Out) {
 398         let out = SearchingOutput::new(underlying_out);
 399         let broadcast = Arc::new(TestBroadcaster{});
 400         let router = FuzzRouter {};
 401
 402         macro_rules! make_node {
 403                 ($node_id: expr, $fee_estimator: expr) => { {
 404                         let logger: Arc<dyn Logger> = Arc::new(test_logger::TestLogger::new($node_id.to_string(), out.clone()));
 405                         let keys_manager = Arc::new(KeyProvider { node_id: $node_id, rand_bytes_id: atomic::AtomicU32::new(0), enforcement_states: Mutex::new(HashMap::new()) });
 406                         let monitor = Arc::new(TestChainMonitor::new(broadcast.clone(), logger.clone(), $fee_estimator.clone(),
 407                                 Arc::new(TestPersister {
 408                                         update_ret: Mutex::new(ChannelMonitorUpdateStatus::Completed)
 409                                 }), Arc::clone(&keys_manager)));
 410
 411                         let mut config = UserConfig::default();
 412                         config.channel_config.forwarding_fee_proportional_millionths = 0;
 413                         config.channel_handshake_config.announced_channel = true;
 414                         let network = Network::Bitcoin;
 415                         let params = ChainParameters {
 416                                 network,
 417                                 best_block: BestBlock::from_genesis(network),
 418                         };
 419                         (ChannelManager::new($fee_estimator.clone(), monitor.clone(), broadcast.clone(), &router, Arc::clone(&logger), keys_manager.clone(), config, params),
 420                         monitor, keys_manager)
 421                 } }
 422         }
 423
 424         macro_rules! reload_node {
 425                 ($ser: expr, $node_id: expr, $old_monitors: expr, $keys_manager: expr, $fee_estimator: expr) => { {
 426                     let keys_manager = Arc::clone(& $keys_manager);
 427                         let logger: Arc<dyn Logger> = Arc::new(test_logger::TestLogger::new($node_id.to_string(), out.clone()));
 428                         let chain_monitor = Arc::new(TestChainMonitor::new(broadcast.clone(), logger.clone(), $fee_estimator.clone(),
 429                                 Arc::new(TestPersister {
 430                                         update_ret: Mutex::new(ChannelMonitorUpdateStatus::Completed)
 431                                 }), Arc::clone(& $keys_manager)));
 432
 433                         let mut config = UserConfig::default();
 434                         config.channel_config.forwarding_fee_proportional_millionths = 0;
 435                         config.channel_handshake_config.announced_channel = true;
 436
 437                         let mut monitors = HashMap::new();
 438                         let mut old_monitors = $old_monitors.latest_monitors.lock().unwrap();
 439                         for (outpoint, (update_id, monitor_ser)) in old_monitors.drain() {
 440                                 monitors.insert(outpoint, <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(&mut Cursor::new(&monitor_ser), &*$keys_manager).expect("Failed to read monitor").1);
 441                                 chain_monitor.latest_monitors.lock().unwrap().insert(outpoint, (update_id, monitor_ser));
 442                         }
 443                         let mut monitor_refs = HashMap::new();
 444                         for (outpoint, monitor) in monitors.iter_mut() {
 445                                 monitor_refs.insert(*outpoint, monitor);
 446                         }
 447
 448                         let read_args = ChannelManagerReadArgs {
 449                                 keys_manager,
 450                                 fee_estimator: $fee_estimator.clone(),
 451                                 chain_monitor: chain_monitor.clone(),
 452                                 tx_broadcaster: broadcast.clone(),
 453                                 router: &router,
 454                                 logger,
 455                                 default_config: config,
 456                                 channel_monitors: monitor_refs,
 457                         };
 458
 459                         let res = (<(BlockHash, ChanMan)>::read(&mut Cursor::new(&$ser.0), read_args).expect("Failed to read manager").1, chain_monitor.clone());
 460                         for (funding_txo, mon) in monitors.drain() {
 461                                 assert_eq!(chain_monitor.chain_monitor.watch_channel(funding_txo, mon),
 462                                         ChannelMonitorUpdateStatus::Completed);
 463                         }
 464                         res
 465                 } }
 466         }
 467
 468         let mut channel_txn = Vec::new();
 469         macro_rules! make_channel {
 470                 ($source: expr, $dest: expr, $chan_id: expr) => { {
 471                         $source.peer_connected(&$dest.get_our_node_id(), &Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
 472                         $dest.peer_connected(&$source.get_our_node_id(), &Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
 473
 474                         $source.create_channel($dest.get_our_node_id(), 100_000, 42, 0, None).unwrap();
 475                         let open_channel = {
 476                                 let events = $source.get_and_clear_pending_msg_events();
 477                                 assert_eq!(events.len(), 1);
 478                                 if let events::MessageSendEvent::SendOpenChannel { ref msg, .. } = events[0] {
 479                                         msg.clone()
 480                                 } else { panic!("Wrong event type"); }
 481                         };
 482
 483                         $dest.handle_open_channel(&$source.get_our_node_id(), channelmanager::provided_init_features(), &open_channel);
 484                         let accept_channel = {
 485                                 let events = $dest.get_and_clear_pending_msg_events();
 486                                 assert_eq!(events.len(), 1);
 487                                 if let events::MessageSendEvent::SendAcceptChannel { ref msg, .. } = events[0] {
 488                                         msg.clone()
 489                                 } else { panic!("Wrong event type"); }
 490                         };
 491
 492                         $source.handle_accept_channel(&$dest.get_our_node_id(), channelmanager::provided_init_features(), &accept_channel);
 493                         let funding_output;
 494                         {
 495                                 let events = $source.get_and_clear_pending_events();
 496                                 assert_eq!(events.len(), 1);
 497                                 if let events::Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, .. } = events[0] {
 498                                         let tx = Transaction { version: $chan_id, lock_time: PackedLockTime::ZERO, input: Vec::new(), output: vec![TxOut {
 499                                                 value: *channel_value_satoshis, script_pubkey: output_script.clone(),
 500                                         }]};
 501                                         funding_output = OutPoint { txid: tx.txid(), index: 0 };
 502                                         $source.funding_transaction_generated(&temporary_channel_id, &$dest.get_our_node_id(), tx.clone()).unwrap();
 503                                         channel_txn.push(tx);
 504                                 } else { panic!("Wrong event type"); }
 505                         }
 506
 507                         let funding_created = {
 508                                 let events = $source.get_and_clear_pending_msg_events();
 509                                 assert_eq!(events.len(), 1);
 510                                 if let events::MessageSendEvent::SendFundingCreated { ref msg, .. } = events[0] {
 511                                         msg.clone()
 512                                 } else { panic!("Wrong event type"); }
 513                         };
 514                         $dest.handle_funding_created(&$source.get_our_node_id(), &funding_created);
 515
 516                         let funding_signed = {
 517                                 let events = $dest.get_and_clear_pending_msg_events();
 518                                 assert_eq!(events.len(), 1);
 519                                 if let events::MessageSendEvent::SendFundingSigned { ref msg, .. } = events[0] {
 520                                         msg.clone()
 521                                 } else { panic!("Wrong event type"); }
 522                         };
 523                         $source.handle_funding_signed(&$dest.get_our_node_id(), &funding_signed);
 524
 525                         funding_output
 526                 } }
 527         }
 528
 529         macro_rules! confirm_txn {
 530                 ($node: expr) => { {
 531                         let chain_hash = genesis_block(Network::Bitcoin).block_hash();
 532                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: chain_hash, merkle_root: TxMerkleNode::all_zeros(), time: 42, bits: 42, nonce: 42 };
 533                         let txdata: Vec<_> = channel_txn.iter().enumerate().map(|(i, tx)| (i + 1, tx)).collect();
 534                         $node.transactions_confirmed(&header, &txdata, 1);
 535                         for _ in 2..100 {
 536                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.block_hash(), merkle_root: TxMerkleNode::all_zeros(), time: 42, bits: 42, nonce: 42 };
 537                         }
 538                         $node.best_block_updated(&header, 99);
 539                 } }
 540         }
 541
 542         macro_rules! lock_fundings {
 543                 ($nodes: expr) => { {
 544                         let mut node_events = Vec::new();
 545                         for node in $nodes.iter() {
 546                                 node_events.push(node.get_and_clear_pending_msg_events());
 547                         }
 548                         for (idx, node_event) in node_events.iter().enumerate() {
 549                                 for event in node_event {
 550                                         if let events::MessageSendEvent::SendChannelReady { ref node_id, ref msg } = event {
 551                                                 for node in $nodes.iter() {
 552                                                         if node.get_our_node_id() == *node_id {
 553                                                                 node.handle_channel_ready(&$nodes[idx].get_our_node_id(), msg);
 554                                                         }
 555                                                 }
 556                                         } else { panic!("Wrong event type"); }
 557                                 }
 558                         }
 559
 560                         for node in $nodes.iter() {
 561                                 let events = node.get_and_clear_pending_msg_events();
 562                                 for event in events {
 563                                         if let events::MessageSendEvent::SendAnnouncementSignatures { .. } = event {
 564                                         } else { panic!("Wrong event type"); }
 565                                 }
 566                         }
 567                 } }
 568         }
 569
 570         let fee_est_a = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 571         let mut last_htlc_clear_fee_a =  253;
 572         let fee_est_b = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 573         let mut last_htlc_clear_fee_b =  253;
 574         let fee_est_c = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 575         let mut last_htlc_clear_fee_c =  253;
 576
 577         // 3 nodes is enough to hit all the possible cases, notably unknown-source-unknown-dest
 578         // forwarding.
 579         let (node_a, mut monitor_a, keys_manager_a) = make_node!(0, fee_est_a);
 580         let (node_b, mut monitor_b, keys_manager_b) = make_node!(1, fee_est_b);
 581         let (node_c, mut monitor_c, keys_manager_c) = make_node!(2, fee_est_c);
 582
 583         let mut nodes = [node_a, node_b, node_c];
 584
 585         let chan_1_funding = make_channel!(nodes[0], nodes[1], 0);
 586         let chan_2_funding = make_channel!(nodes[1], nodes[2], 1);
 587
 588         for node in nodes.iter() {
 589                 confirm_txn!(node);
 590         }
 591
 592         lock_fundings!(nodes);
 593
 594         let chan_a = nodes[0].list_usable_channels()[0].short_channel_id.unwrap();
 595         let chan_b = nodes[2].list_usable_channels()[0].short_channel_id.unwrap();
 596
 597         let mut payment_id: u8 = 0;
 598         let mut payment_idx: u64 = 0;
 599
 600         let mut chan_a_disconnected = false;
 601         let mut chan_b_disconnected = false;
 602         let mut ab_events = Vec::new();
 603         let mut ba_events = Vec::new();
 604         let mut bc_events = Vec::new();
 605         let mut cb_events = Vec::new();
 606
 607         let mut node_a_ser = VecWriter(Vec::new());
 608         nodes[0].write(&mut node_a_ser).unwrap();
 609         let mut node_b_ser = VecWriter(Vec::new());
 610         nodes[1].write(&mut node_b_ser).unwrap();
 611         let mut node_c_ser = VecWriter(Vec::new());
 612         nodes[2].write(&mut node_c_ser).unwrap();
 613
 614         macro_rules! test_return {
 615                 () => { {
 616                         assert_eq!(nodes[0].list_channels().len(), 1);
 617                         assert_eq!(nodes[1].list_channels().len(), 2);
 618                         assert_eq!(nodes[2].list_channels().len(), 1);
 619                         return;
 620                 } }
 621         }
 622
 623         let mut read_pos = 0;
 624         macro_rules! get_slice {
 625                 ($len: expr) => {
 626                         {
 627                                 let slice_len = $len as usize;
 628                                 if data.len() < read_pos + slice_len {
 629                                         test_return!();
 630                                 }
 631                                 read_pos += slice_len;
 632                                 &data[read_pos - slice_len..read_pos]
 633                         }
 634                 }
 635         }
 636
 637         loop {
 638                 // Push any events from Node B onto ba_events and bc_events
 639                 macro_rules! push_excess_b_events {
 640                         ($excess_events: expr, $expect_drop_node: expr) => { {
 641                                 let a_id = nodes[0].get_our_node_id();
 642                                 let expect_drop_node: Option<usize> = $expect_drop_node;
 643                                 let expect_drop_id = if let Some(id) = expect_drop_node { Some(nodes[id].get_our_node_id()) } else { None };
 644                                 for event in $excess_events {
 645                                         let push_a = match event {
 646                                                 events::MessageSendEvent::UpdateHTLCs { ref node_id, .. } => {
 647                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 648                                                         *node_id == a_id
 649                                                 },
 650                                                 events::MessageSendEvent::SendRevokeAndACK { ref node_id, .. } => {
 651                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 652                                                         *node_id == a_id
 653                                                 },
 654                                                 events::MessageSendEvent::SendChannelReestablish { ref node_id, .. } => {
 655                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 656                                                         *node_id == a_id
 657                                                 },
 658                                                 events::MessageSendEvent::SendChannelReady { .. } => continue,
 659                                                 events::MessageSendEvent::SendAnnouncementSignatures { .. } => continue,
 660                                                 events::MessageSendEvent::SendChannelUpdate { ref node_id, ref msg } => {
 661                                                         assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 662                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 663                                                         *node_id == a_id
 664                                                 },
 665                                                 _ => panic!("Unhandled message event {:?}", event),
 666                                         };
 667                                         if push_a { ba_events.push(event); } else { bc_events.push(event); }
 668                                 }
 669                         } }
 670                 }
 671
 672                 // While delivering messages, we select across three possible message selection processes
 673                 // to ensure we get as much coverage as possible. See the individual enum variants for more
 674                 // details.
 675                 #[derive(PartialEq)]
 676                 enum ProcessMessages {
 677                         /// Deliver all available messages, including fetching any new messages from
 678                         /// `get_and_clear_pending_msg_events()` (which may have side effects).
 679                         AllMessages,
 680                         /// Call `get_and_clear_pending_msg_events()` first, and then deliver up to one
 681                         /// message (which may already be queued).
 682                         OneMessage,
 683                         /// Deliver up to one already-queued message. This avoids any potential side-effects
 684                         /// of `get_and_clear_pending_msg_events()` (eg freeing the HTLC holding cell), which
 685                         /// provides potentially more coverage.
 686                         OnePendingMessage,
 687                 }
 688
 689                 macro_rules! process_msg_events {
 690                         ($node: expr, $corrupt_forward: expr, $limit_events: expr) => { {
 691                                 let mut events = if $node == 1 {
 692                                         let mut new_events = Vec::new();
 693                                         mem::swap(&mut new_events, &mut ba_events);
 694                                         new_events.extend_from_slice(&bc_events[..]);
 695                                         bc_events.clear();
 696                                         new_events
 697                                 } else if $node == 0 {
 698                                         let mut new_events = Vec::new();
 699                                         mem::swap(&mut new_events, &mut ab_events);
 700                                         new_events
 701                                 } else {
 702                                         let mut new_events = Vec::new();
 703                                         mem::swap(&mut new_events, &mut cb_events);
 704                                         new_events
 705                                 };
 706                                 let mut new_events = Vec::new();
 707                                 if $limit_events != ProcessMessages::OnePendingMessage {
 708                                         new_events = nodes[$node].get_and_clear_pending_msg_events();
 709                                 }
 710                                 let mut had_events = false;
 711                                 let mut events_iter = events.drain(..).chain(new_events.drain(..));
 712                                 let mut extra_ev = None;
 713                                 for event in &mut events_iter {
 714                                         had_events = true;
 715                                         match event {
 716                                                 events::MessageSendEvent::UpdateHTLCs { node_id, updates: CommitmentUpdate { update_add_htlcs, update_fail_htlcs, update_fulfill_htlcs, update_fail_malformed_htlcs, update_fee, commitment_signed } } => {
 717                                                         for (idx, dest) in nodes.iter().enumerate() {
 718                                                                 if dest.get_our_node_id() == node_id {
 719                                                                         for update_add in update_add_htlcs.iter() {
 720                                                                                 out.locked_write(format!("Delivering update_add_htlc to node {}.\n", idx).as_bytes());
 721                                                                                 if !$corrupt_forward {
 722                                                                                         dest.handle_update_add_htlc(&nodes[$node].get_our_node_id(), update_add);
 723                                                                                 } else {
 724                                                                                         // Corrupt the update_add_htlc message so that its HMAC
 725                                                                                         // check will fail and we generate a
 726                                                                                         // update_fail_malformed_htlc instead of an
 727                                                                                         // update_fail_htlc as we do when we reject a payment.
 728                                                                                         let mut msg_ser = update_add.encode();
 729                                                                                         msg_ser[1000] ^= 0xff;
 730                                                                                         let new_msg = UpdateAddHTLC::read(&mut Cursor::new(&msg_ser)).unwrap();
 731                                                                                         dest.handle_update_add_htlc(&nodes[$node].get_our_node_id(), &new_msg);
 732                                                                                 }
 733                                                                         }
 734                                                                         for update_fulfill in update_fulfill_htlcs.iter() {
 735                                                                                 out.locked_write(format!("Delivering update_fulfill_htlc to node {}.\n", idx).as_bytes());
 736                                                                                 dest.handle_update_fulfill_htlc(&nodes[$node].get_our_node_id(), update_fulfill);
 737                                                                         }
 738                                                                         for update_fail in update_fail_htlcs.iter() {
 739                                                                                 out.locked_write(format!("Delivering update_fail_htlc to node {}.\n", idx).as_bytes());
 740                                                                                 dest.handle_update_fail_htlc(&nodes[$node].get_our_node_id(), update_fail);
 741                                                                         }
 742                                                                         for update_fail_malformed in update_fail_malformed_htlcs.iter() {
 743                                                                                 out.locked_write(format!("Delivering update_fail_malformed_htlc to node {}.\n", idx).as_bytes());
 744                                                                                 dest.handle_update_fail_malformed_htlc(&nodes[$node].get_our_node_id(), update_fail_malformed);
 745                                                                         }
 746                                                                         if let Some(msg) = update_fee {
 747                                                                                 out.locked_write(format!("Delivering update_fee to node {}.\n", idx).as_bytes());
 748                                                                                 dest.handle_update_fee(&nodes[$node].get_our_node_id(), &msg);
 749                                                                         }
 750                                                                         let processed_change = !update_add_htlcs.is_empty() || !update_fulfill_htlcs.is_empty() ||
 751                                                                                 !update_fail_htlcs.is_empty() || !update_fail_malformed_htlcs.is_empty();
 752                                                                         if $limit_events != ProcessMessages::AllMessages && processed_change {
 753                                                                                 // If we only want to process some messages, don't deliver the CS until later.
 754                                                                                 extra_ev = Some(events::MessageSendEvent::UpdateHTLCs { node_id, updates: CommitmentUpdate {
 755                                                                                         update_add_htlcs: Vec::new(),
 756                                                                                         update_fail_htlcs: Vec::new(),
 757                                                                                         update_fulfill_htlcs: Vec::new(),
 758                                                                                         update_fail_malformed_htlcs: Vec::new(),
 759                                                                                         update_fee: None,
 760                                                                                         commitment_signed
 761                                                                                 } });
 762                                                                                 break;
 763                                                                         }
 764                                                                         out.locked_write(format!("Delivering commitment_signed to node {}.\n", idx).as_bytes());
 765                                                                         dest.handle_commitment_signed(&nodes[$node].get_our_node_id(), &commitment_signed);
 766                                                                         break;
 767                                                                 }
 768                                                         }
 769                                                 },
 770                                                 events::MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
 771                                                         for (idx, dest) in nodes.iter().enumerate() {
 772                                                                 if dest.get_our_node_id() == *node_id {
 773                                                                         out.locked_write(format!("Delivering revoke_and_ack to node {}.\n", idx).as_bytes());
 774                                                                         dest.handle_revoke_and_ack(&nodes[$node].get_our_node_id(), msg);
 775                                                                 }
 776                                                         }
 777                                                 },
 778                                                 events::MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
 779                                                         for (idx, dest) in nodes.iter().enumerate() {
 780                                                                 if dest.get_our_node_id() == *node_id {
 781                                                                         out.locked_write(format!("Delivering channel_reestablish to node {}.\n", idx).as_bytes());
 782                                                                         dest.handle_channel_reestablish(&nodes[$node].get_our_node_id(), msg);
 783                                                                 }
 784                                                         }
 785                                                 },
 786                                                 events::MessageSendEvent::SendChannelReady { .. } => {
 787                                                         // Can be generated as a reestablish response
 788                                                 },
 789                                                 events::MessageSendEvent::SendAnnouncementSignatures { .. } => {
 790                                                         // Can be generated as a reestablish response
 791                                                 },
 792                                                 events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 793                                                         // When we reconnect we will resend a channel_update to make sure our
 794                                                         // counterparty has the latest parameters for receiving payments
 795                                                         // through us. We do, however, check that the message does not include
 796                                                         // the "disabled" bit, as we should never ever have a channel which is
 797                                                         // disabled when we send such an update (or it may indicate channel
 798                                                         // force-close which we should detect as an error).
 799                                                         assert_eq!(msg.contents.flags & 2, 0);
 800                                                 },
 801                                                 _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 802                                                         return;
 803                                                 } else {
 804                                                         panic!("Unhandled message event {:?}", event)
 805                                                 },
 806                                         }
 807                                         if $limit_events != ProcessMessages::AllMessages {
 808                                                 break;
 809                                         }
 810                                 }
 811                                 if $node == 1 {
 812                                         push_excess_b_events!(extra_ev.into_iter().chain(events_iter), None);
 813                                 } else if $node == 0 {
 814                                         if let Some(ev) = extra_ev { ab_events.push(ev); }
 815                                         for event in events_iter { ab_events.push(event); }
 816                                 } else {
 817                                         if let Some(ev) = extra_ev { cb_events.push(ev); }
 818                                         for event in events_iter { cb_events.push(event); }
 819                                 }
 820                                 had_events
 821                         } }
 822                 }
 823
 824                 macro_rules! drain_msg_events_on_disconnect {
 825                         ($counterparty_id: expr) => { {
 826                                 if $counterparty_id == 0 {
 827                                         for event in nodes[0].get_and_clear_pending_msg_events() {
 828                                                 match event {
 829                                                         events::MessageSendEvent::UpdateHTLCs { .. } => {},
 830                                                         events::MessageSendEvent::SendRevokeAndACK { .. } => {},
 831                                                         events::MessageSendEvent::SendChannelReestablish { .. } => {},
 832                                                         events::MessageSendEvent::SendChannelReady { .. } => {},
 833                                                         events::MessageSendEvent::SendAnnouncementSignatures { .. } => {},
 834                                                         events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 835                                                                 assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 836                                                         },
 837                                                         _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 838                                                                 return;
 839                                                         } else {
 840                                                                 panic!("Unhandled message event")
 841                                                         },
 842                                                 }
 843                                         }
 844                                         push_excess_b_events!(nodes[1].get_and_clear_pending_msg_events().drain(..), Some(0));
 845                                         ab_events.clear();
 846                                         ba_events.clear();
 847                                 } else {
 848                                         for event in nodes[2].get_and_clear_pending_msg_events() {
 849                                                 match event {
 850                                                         events::MessageSendEvent::UpdateHTLCs { .. } => {},
 851                                                         events::MessageSendEvent::SendRevokeAndACK { .. } => {},
 852                                                         events::MessageSendEvent::SendChannelReestablish { .. } => {},
 853                                                         events::MessageSendEvent::SendChannelReady { .. } => {},
 854                                                         events::MessageSendEvent::SendAnnouncementSignatures { .. } => {},
 855                                                         events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 856                                                                 assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 857                                                         },
 858                                                         _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 859                                                                 return;
 860                                                         } else {
 861                                                                 panic!("Unhandled message event")
 862                                                         },
 863                                                 }
 864                                         }
 865                                         push_excess_b_events!(nodes[1].get_and_clear_pending_msg_events().drain(..), Some(2));
 866                                         bc_events.clear();
 867                                         cb_events.clear();
 868                                 }
 869                         } }
 870                 }
 871
 872                 macro_rules! process_events {
 873                         ($node: expr, $fail: expr) => { {
 874                                 // In case we get 256 payments we may have a hash collision, resulting in the
 875                                 // second claim/fail call not finding the duplicate-hash HTLC, so we have to
 876                                 // deduplicate the calls here.
 877                                 let mut claim_set = HashSet::new();
 878                                 let mut events = nodes[$node].get_and_clear_pending_events();
 879                                 // Sort events so that PendingHTLCsForwardable get processed last. This avoids a
 880                                 // case where we first process a PendingHTLCsForwardable, then claim/fail on a
 881                                 // PaymentClaimable, claiming/failing two HTLCs, but leaving a just-generated
 882                                 // PaymentClaimable event for the second HTLC in our pending_events (and breaking
 883                                 // our claim_set deduplication).
 884                                 events.sort_by(|a, b| {
 885                                         if let events::Event::PaymentClaimable { .. } = a {
 886                                                 if let events::Event::PendingHTLCsForwardable { .. } = b {
 887                                                         Ordering::Less
 888                                                 } else { Ordering::Equal }
 889                                         } else if let events::Event::PendingHTLCsForwardable { .. } = a {
 890                                                 if let events::Event::PaymentClaimable { .. } = b {
 891                                                         Ordering::Greater
 892                                                 } else { Ordering::Equal }
 893                                         } else { Ordering::Equal }
 894                                 });
 895                                 let had_events = !events.is_empty();
 896                                 for event in events.drain(..) {
 897                                         match event {
 898                                                 events::Event::PaymentClaimable { payment_hash, .. } => {
 899                                                         if claim_set.insert(payment_hash.0) {
 900                                                                 if $fail {
 901                                                                         nodes[$node].fail_htlc_backwards(&payment_hash);
 902                                                                 } else {
 903                                                                         nodes[$node].claim_funds(PaymentPreimage(payment_hash.0));
 904                                                                 }
 905                                                         }
 906                                                 },
 907                                                 events::Event::PaymentSent { .. } => {},
 908                                                 events::Event::PaymentClaimed { .. } => {},
 909                                                 events::Event::PaymentPathSuccessful { .. } => {},
 910                                                 events::Event::PaymentPathFailed { .. } => {},
 911                                                 events::Event::ProbeSuccessful { .. } | events::Event::ProbeFailed { .. } => {
 912                                                         // Even though we don't explicitly send probes, because probes are
 913                                                         // detected based on hashing the payment hash+preimage, its rather
 914                                                         // trivial for the fuzzer to build payments that accidentally end up
 915                                                         // looking like probes.
 916                                                 },
 917                                                 events::Event::PaymentForwarded { .. } if $node == 1 => {},
 918                                                 events::Event::ChannelReady { .. } => {},
 919                                                 events::Event::PendingHTLCsForwardable { .. } => {
 920                                                         nodes[$node].process_pending_htlc_forwards();
 921                                                 },
 922                                                 events::Event::HTLCHandlingFailed { .. } => {},
 923                                                 _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 924                                                         return;
 925                                                 } else {
 926                                                         panic!("Unhandled event")
 927                                                 },
 928                                         }
 929                                 }
 930                                 had_events
 931                         } }
 932                 }
 933
 934                 let v = get_slice!(1)[0];
 935                 out.locked_write(format!("READ A BYTE! HANDLING INPUT {:x}...........\n", v).as_bytes());
 936                 match v {
 937                         // In general, we keep related message groups close together in binary form, allowing
 938                         // bit-twiddling mutations to have similar effects. This is probably overkill, but no
 939                         // harm in doing so.
 940
 941                         0x00 => *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
 942                         0x01 => *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
 943                         0x02 => *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
 944                         0x04 => *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
 945                         0x05 => *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
 946                         0x06 => *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
 947
 948                         0x08 => {
 949                                 if let Some((id, _)) = monitor_a.latest_monitors.lock().unwrap().get(&chan_1_funding) {
 950                                         monitor_a.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
 951                                         nodes[0].process_monitor_events();
 952                                 }
 953                         },
 954                         0x09 => {
 955                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_1_funding) {
 956                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
 957                                         nodes[1].process_monitor_events();
 958                                 }
 959                         },
 960                         0x0a => {
 961                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_2_funding) {
 962                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
 963                                         nodes[1].process_monitor_events();
 964                                 }
 965                         },
 966                         0x0b => {
 967                                 if let Some((id, _)) = monitor_c.latest_monitors.lock().unwrap().get(&chan_2_funding) {
 968                                         monitor_c.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
 969                                         nodes[2].process_monitor_events();
 970                                 }
 971                         },
 972
 973                         0x0c => {
 974                                 if !chan_a_disconnected {
 975                                         nodes[0].peer_disconnected(&nodes[1].get_our_node_id(), false);
 976                                         nodes[1].peer_disconnected(&nodes[0].get_our_node_id(), false);
 977                                         chan_a_disconnected = true;
 978                                         drain_msg_events_on_disconnect!(0);
 979                                 }
 980                         },
 981                         0x0d => {
 982                                 if !chan_b_disconnected {
 983                                         nodes[1].peer_disconnected(&nodes[2].get_our_node_id(), false);
 984                                         nodes[2].peer_disconnected(&nodes[1].get_our_node_id(), false);
 985                                         chan_b_disconnected = true;
 986                                         drain_msg_events_on_disconnect!(2);
 987                                 }
 988                         },
 989                         0x0e => {
 990                                 if chan_a_disconnected {
 991                                         nodes[0].peer_connected(&nodes[1].get_our_node_id(), &Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
 992                                         nodes[1].peer_connected(&nodes[0].get_our_node_id(), &Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
 993                                         chan_a_disconnected = false;
 994                                 }
 995                         },
 996                         0x0f => {
 997                                 if chan_b_disconnected {
 998                                         nodes[1].peer_connected(&nodes[2].get_our_node_id(), &Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
 999                                         nodes[2].peer_connected(&nodes[1].get_our_node_id(), &Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
1000                                         chan_b_disconnected = false;
1001                                 }
1002                         },
1003
1004                         0x10 => { process_msg_events!(0, true, ProcessMessages::AllMessages); },
1005                         0x11 => { process_msg_events!(0, false, ProcessMessages::AllMessages); },
1006                         0x12 => { process_msg_events!(0, true, ProcessMessages::OneMessage); },
1007                         0x13 => { process_msg_events!(0, false, ProcessMessages::OneMessage); },
1008                         0x14 => { process_msg_events!(0, true, ProcessMessages::OnePendingMessage); },
1009                         0x15 => { process_msg_events!(0, false, ProcessMessages::OnePendingMessage); },
1010
1011                         0x16 => { process_events!(0, true); },
1012                         0x17 => { process_events!(0, false); },
1013
1014                         0x18 => { process_msg_events!(1, true, ProcessMessages::AllMessages); },
1015                         0x19 => { process_msg_events!(1, false, ProcessMessages::AllMessages); },
1016                         0x1a => { process_msg_events!(1, true, ProcessMessages::OneMessage); },
1017                         0x1b => { process_msg_events!(1, false, ProcessMessages::OneMessage); },
1018                         0x1c => { process_msg_events!(1, true, ProcessMessages::OnePendingMessage); },
1019                         0x1d => { process_msg_events!(1, false, ProcessMessages::OnePendingMessage); },
1020
1021                         0x1e => { process_events!(1, true); },
1022                         0x1f => { process_events!(1, false); },
1023
1024                         0x20 => { process_msg_events!(2, true, ProcessMessages::AllMessages); },
1025                         0x21 => { process_msg_events!(2, false, ProcessMessages::AllMessages); },
1026                         0x22 => { process_msg_events!(2, true, ProcessMessages::OneMessage); },
1027                         0x23 => { process_msg_events!(2, false, ProcessMessages::OneMessage); },
1028                         0x24 => { process_msg_events!(2, true, ProcessMessages::OnePendingMessage); },
1029                         0x25 => { process_msg_events!(2, false, ProcessMessages::OnePendingMessage); },
1030
1031                         0x26 => { process_events!(2, true); },
1032                         0x27 => { process_events!(2, false); },
1033
1034                         0x2c => {
1035                                 if !chan_a_disconnected {
1036                                         nodes[1].peer_disconnected(&nodes[0].get_our_node_id(), false);
1037                                         chan_a_disconnected = true;
1038                                         drain_msg_events_on_disconnect!(0);
1039                                 }
1040                                 if monitor_a.should_update_manager.load(atomic::Ordering::Relaxed) {
1041                                         node_a_ser.0.clear();
1042                                         nodes[0].write(&mut node_a_ser).unwrap();
1043                                 }
1044                                 let (new_node_a, new_monitor_a) = reload_node!(node_a_ser, 0, monitor_a, keys_manager_a, fee_est_a);
1045                                 nodes[0] = new_node_a;
1046                                 monitor_a = new_monitor_a;
1047                         },
1048                         0x2d => {
1049                                 if !chan_a_disconnected {
1050                                         nodes[0].peer_disconnected(&nodes[1].get_our_node_id(), false);
1051                                         chan_a_disconnected = true;
1052                                         nodes[0].get_and_clear_pending_msg_events();
1053                                         ab_events.clear();
1054                                         ba_events.clear();
1055                                 }
1056                                 if !chan_b_disconnected {
1057                                         nodes[2].peer_disconnected(&nodes[1].get_our_node_id(), false);
1058                                         chan_b_disconnected = true;
1059                                         nodes[2].get_and_clear_pending_msg_events();
1060                                         bc_events.clear();
1061                                         cb_events.clear();
1062                                 }
1063                                 let (new_node_b, new_monitor_b) = reload_node!(node_b_ser, 1, monitor_b, keys_manager_b, fee_est_b);
1064                                 nodes[1] = new_node_b;
1065                                 monitor_b = new_monitor_b;
1066                         },
1067                         0x2e => {
1068                                 if !chan_b_disconnected {
1069                                         nodes[1].peer_disconnected(&nodes[2].get_our_node_id(), false);
1070                                         chan_b_disconnected = true;
1071                                         drain_msg_events_on_disconnect!(2);
1072                                 }
1073                                 if monitor_c.should_update_manager.load(atomic::Ordering::Relaxed) {
1074                                         node_c_ser.0.clear();
1075                                         nodes[2].write(&mut node_c_ser).unwrap();
1076                                 }
1077                                 let (new_node_c, new_monitor_c) = reload_node!(node_c_ser, 2, monitor_c, keys_manager_c, fee_est_c);
1078                                 nodes[2] = new_node_c;
1079                                 monitor_c = new_monitor_c;
1080                         },
1081
1082                         // 1/10th the channel size:
1083                         0x30 => { send_payment(&nodes[0], &nodes[1], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1084                         0x31 => { send_payment(&nodes[1], &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1085                         0x32 => { send_payment(&nodes[1], &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1086                         0x33 => { send_payment(&nodes[2], &nodes[1], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1087                         0x34 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1088                         0x35 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1089
1090                         0x38 => { send_payment(&nodes[0], &nodes[1], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1091                         0x39 => { send_payment(&nodes[1], &nodes[0], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1092                         0x3a => { send_payment(&nodes[1], &nodes[2], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1093                         0x3b => { send_payment(&nodes[2], &nodes[1], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1094                         0x3c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1095                         0x3d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1096
1097                         0x40 => { send_payment(&nodes[0], &nodes[1], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1098                         0x41 => { send_payment(&nodes[1], &nodes[0], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1099                         0x42 => { send_payment(&nodes[1], &nodes[2], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1100                         0x43 => { send_payment(&nodes[2], &nodes[1], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1101                         0x44 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1102                         0x45 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1103
1104                         0x48 => { send_payment(&nodes[0], &nodes[1], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1105                         0x49 => { send_payment(&nodes[1], &nodes[0], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1106                         0x4a => { send_payment(&nodes[1], &nodes[2], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1107                         0x4b => { send_payment(&nodes[2], &nodes[1], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1108                         0x4c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1109                         0x4d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1110
1111                         0x50 => { send_payment(&nodes[0], &nodes[1], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1112                         0x51 => { send_payment(&nodes[1], &nodes[0], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1113                         0x52 => { send_payment(&nodes[1], &nodes[2], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1114                         0x53 => { send_payment(&nodes[2], &nodes[1], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1115                         0x54 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1116                         0x55 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1117
1118                         0x58 => { send_payment(&nodes[0], &nodes[1], chan_a, 100, &mut payment_id, &mut payment_idx); },
1119                         0x59 => { send_payment(&nodes[1], &nodes[0], chan_a, 100, &mut payment_id, &mut payment_idx); },
1120                         0x5a => { send_payment(&nodes[1], &nodes[2], chan_b, 100, &mut payment_id, &mut payment_idx); },
1121                         0x5b => { send_payment(&nodes[2], &nodes[1], chan_b, 100, &mut payment_id, &mut payment_idx); },
1122                         0x5c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 100, &mut payment_id, &mut payment_idx); },
1123                         0x5d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 100, &mut payment_id, &mut payment_idx); },
1124
1125                         0x60 => { send_payment(&nodes[0], &nodes[1], chan_a, 10, &mut payment_id, &mut payment_idx); },
1126                         0x61 => { send_payment(&nodes[1], &nodes[0], chan_a, 10, &mut payment_id, &mut payment_idx); },
1127                         0x62 => { send_payment(&nodes[1], &nodes[2], chan_b, 10, &mut payment_id, &mut payment_idx); },
1128                         0x63 => { send_payment(&nodes[2], &nodes[1], chan_b, 10, &mut payment_id, &mut payment_idx); },
1129                         0x64 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10, &mut payment_id, &mut payment_idx); },
1130                         0x65 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10, &mut payment_id, &mut payment_idx); },
1131
1132                         0x68 => { send_payment(&nodes[0], &nodes[1], chan_a, 1, &mut payment_id, &mut payment_idx); },
1133                         0x69 => { send_payment(&nodes[1], &nodes[0], chan_a, 1, &mut payment_id, &mut payment_idx); },
1134                         0x6a => { send_payment(&nodes[1], &nodes[2], chan_b, 1, &mut payment_id, &mut payment_idx); },
1135                         0x6b => { send_payment(&nodes[2], &nodes[1], chan_b, 1, &mut payment_id, &mut payment_idx); },
1136                         0x6c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1, &mut payment_id, &mut payment_idx); },
1137                         0x6d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1, &mut payment_id, &mut payment_idx); },
1138
1139                         0x80 => {
1140                                 let max_feerate = last_htlc_clear_fee_a * FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1141                                 if fee_est_a.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1142                                         fee_est_a.ret_val.store(max_feerate, atomic::Ordering::Release);
1143                                 }
1144                                 nodes[0].maybe_update_chan_fees();
1145                         },
1146                         0x81 => { fee_est_a.ret_val.store(253, atomic::Ordering::Release); nodes[0].maybe_update_chan_fees(); },
1147
1148                         0x84 => {
1149                                 let max_feerate = last_htlc_clear_fee_b * FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1150                                 if fee_est_b.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1151                                         fee_est_b.ret_val.store(max_feerate, atomic::Ordering::Release);
1152                                 }
1153                                 nodes[1].maybe_update_chan_fees();
1154                         },
1155                         0x85 => { fee_est_b.ret_val.store(253, atomic::Ordering::Release); nodes[1].maybe_update_chan_fees(); },
1156
1157                         0x88 => {
1158                                 let max_feerate = last_htlc_clear_fee_c * FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1159                                 if fee_est_c.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1160                                         fee_est_c.ret_val.store(max_feerate, atomic::Ordering::Release);
1161                                 }
1162                                 nodes[2].maybe_update_chan_fees();
1163                         },
1164                         0x89 => { fee_est_c.ret_val.store(253, atomic::Ordering::Release); nodes[2].maybe_update_chan_fees(); },
1165
1166                         0xff => {
1167                                 // Test that no channel is in a stuck state where neither party can send funds even
1168                                 // after we resolve all pending events.
1169                                 // First make sure there are no pending monitor updates, resetting the error state
1170                                 // and calling force_channel_monitor_updated for each monitor.
1171                                 *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1172                                 *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1173                                 *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1174
1175                                 if let Some((id, _)) = monitor_a.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1176                                         monitor_a.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
1177                                         nodes[0].process_monitor_events();
1178                                 }
1179                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1180                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
1181                                         nodes[1].process_monitor_events();
1182                                 }
1183                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1184                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1185                                         nodes[1].process_monitor_events();
1186                                 }
1187                                 if let Some((id, _)) = monitor_c.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1188                                         monitor_c.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1189                                         nodes[2].process_monitor_events();
1190                                 }
1191
1192                                 // Next, make sure peers are all connected to each other
1193                                 if chan_a_disconnected {
1194                                         nodes[0].peer_connected(&nodes[1].get_our_node_id(), &Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
1195                                         nodes[1].peer_connected(&nodes[0].get_our_node_id(), &Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
1196                                         chan_a_disconnected = false;
1197                                 }
1198                                 if chan_b_disconnected {
1199                                         nodes[1].peer_connected(&nodes[2].get_our_node_id(), &Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
1200                                         nodes[2].peer_connected(&nodes[1].get_our_node_id(), &Init { features: channelmanager::provided_init_features(), remote_network_address: None }).unwrap();
1201                                         chan_b_disconnected = false;
1202                                 }
1203
1204                                 for i in 0..std::usize::MAX {
1205                                         if i == 100 { panic!("It may take may iterations to settle the state, but it should not take forever"); }
1206                                         // Then, make sure any current forwards make their way to their destination
1207                                         if process_msg_events!(0, false, ProcessMessages::AllMessages) { continue; }
1208                                         if process_msg_events!(1, false, ProcessMessages::AllMessages) { continue; }
1209                                         if process_msg_events!(2, false, ProcessMessages::AllMessages) { continue; }
1210                                         // ...making sure any pending PendingHTLCsForwardable events are handled and
1211                                         // payments claimed.
1212                                         if process_events!(0, false) { continue; }
1213                                         if process_events!(1, false) { continue; }
1214                                         if process_events!(2, false) { continue; }
1215                                         break;
1216                                 }
1217
1218                                 // Finally, make sure that at least one end of each channel can make a substantial payment
1219                                 assert!(
1220                                         send_payment(&nodes[0], &nodes[1], chan_a, 10_000_000, &mut payment_id, &mut payment_idx) ||
1221                                         send_payment(&nodes[1], &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx));
1222                                 assert!(
1223                                         send_payment(&nodes[1], &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx) ||
1224                                         send_payment(&nodes[2], &nodes[1], chan_b, 10_000_000, &mut payment_id, &mut payment_idx));
1225
1226                                 last_htlc_clear_fee_a = fee_est_a.ret_val.load(atomic::Ordering::Acquire);
1227                                 last_htlc_clear_fee_b = fee_est_b.ret_val.load(atomic::Ordering::Acquire);
1228                                 last_htlc_clear_fee_c = fee_est_c.ret_val.load(atomic::Ordering::Acquire);
1229                         },
1230                         _ => test_return!(),
1231                 }
1232
1233                 node_a_ser.0.clear();
1234                 nodes[0].write(&mut node_a_ser).unwrap();
1235                 monitor_a.should_update_manager.store(false, atomic::Ordering::Relaxed);
1236                 node_b_ser.0.clear();
1237                 nodes[1].write(&mut node_b_ser).unwrap();
1238                 monitor_b.should_update_manager.store(false, atomic::Ordering::Relaxed);
1239                 node_c_ser.0.clear();
1240                 nodes[2].write(&mut node_c_ser).unwrap();
1241                 monitor_c.should_update_manager.store(false, atomic::Ordering::Relaxed);
1242         }
1243 }
1244
1245 /// We actually have different behavior based on if a certain log string has been seen, so we have
1246 /// to do a bit more tracking.
1247 #[derive(Clone)]
1248 struct SearchingOutput<O: Output> {
1249         output: O,
1250         may_fail: Arc<atomic::AtomicBool>,
1251 }
1252 impl<O: Output> Output for SearchingOutput<O> {
1253         fn locked_write(&self, data: &[u8]) {
1254                 // We hit a design limitation of LN state machine (see CONCURRENT_INBOUND_HTLC_FEE_BUFFER)
1255                 if std::str::from_utf8(data).unwrap().contains("Outbound update_fee HTLC buffer overflow - counterparty should force-close this channel") {
1256                         self.may_fail.store(true, atomic::Ordering::Release);
1257                 }
1258                 self.output.locked_write(data)
1259         }
1260 }
1261 impl<O: Output> SearchingOutput<O> {
1262         pub fn new(output: O) -> Self {
1263                 Self { output, may_fail: Arc::new(atomic::AtomicBool::new(false)) }
1264         }
1265 }
1266
1267 pub fn chanmon_consistency_test<Out: Output>(data: &[u8], out: Out) {
1268         do_test(data, out);
1269 }
1270
1271 #[no_mangle]
1272 pub extern "C" fn chanmon_consistency_run(data: *const u8, datalen: usize) {
1273         do_test(unsafe { std::slice::from_raw_parts(data, datalen) }, test_logger::DevNull{});
1274 }