git.bitcoin.ninja 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::hashes::sha256d::Hash as Sha256dHash;
  33 use bitcoin::hash_types::{BlockHash, WPubkeyHash};
  34
  35 use lightning::chain;
  36 use lightning::chain::{BestBlock, ChannelMonitorUpdateStatus, chainmonitor, channelmonitor, Confirm, Watch};
  37 use lightning::chain::channelmonitor::{ChannelMonitor, MonitorEvent};
  38 use lightning::chain::transaction::OutPoint;
  39 use lightning::chain::chaininterface::{BroadcasterInterface, ConfirmationTarget, FeeEstimator};
  40 use lightning::chain::keysinterface::{KeyMaterial, InMemorySigner, Recipient, EntropySource, NodeSigner, SignerProvider};
  41 use lightning::ln::{PaymentHash, PaymentPreimage, PaymentSecret};
  42 use lightning::ln::channelmanager::{ChainParameters, ChannelDetails, ChannelManager, PaymentSendFailure, ChannelManagerReadArgs, PaymentId};
  43 use lightning::ln::channel::FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE;
  44 use lightning::ln::msgs::{self, CommitmentUpdate, ChannelMessageHandler, DecodeError, UpdateAddHTLC, Init};
  45 use lightning::ln::script::ShutdownScript;
  46 use lightning::util::enforcing_trait_impls::{EnforcingSigner, EnforcementState};
  47 use lightning::util::errors::APIError;
  48 use lightning::util::events;
  49 use lightning::util::logger::Logger;
  50 use lightning::util::config::UserConfig;
  51 use lightning::util::events::MessageSendEventsProvider;
  52 use lightning::util::ser::{Readable, ReadableArgs, Writeable, Writer};
  53 use lightning::routing::router::{InFlightHtlcs, Route, RouteHop, RouteParameters, Router};
  54
  55 use crate::utils::test_logger::{self, Output};
  56 use crate::utils::test_persister::TestPersister;
  57
  58 use bitcoin::secp256k1::{Message, PublicKey, SecretKey, Scalar, Secp256k1};
  59 use bitcoin::secp256k1::ecdh::SharedSecret;
  60 use bitcoin::secp256k1::ecdsa::{RecoverableSignature, Signature};
  61
  62 use std::mem;
  63 use std::cmp::{self, Ordering};
  64 use hashbrown::{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, &*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_secret: SecretKey,
 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_secret[31]];
 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(self.node_secret.clone())
 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_secret[31]])
 211         }
 212
 213         fn sign_invoice(&self, _hrp_bytes: &[u8], _invoice_data: &[u5], _recipient: Recipient) -> Result<RecoverableSignature, ()> {
 214                 unreachable!()
 215         }
 216
 217         fn sign_gossip_message(&self, msg: lightning::ln::msgs::UnsignedGossipMessage) -> Result<Signature, ()> {
 218                 let msg_hash = Message::from_slice(&Sha256dHash::hash(&msg.encode()[..])[..]).map_err(|_| ())?;
 219                 let secp_ctx = Secp256k1::signing_only();
 220                 Ok(secp_ctx.sign_ecdsa(&msg_hash, &self.node_secret))
 221         }
 222 }
 223
 224 impl SignerProvider for KeyProvider {
 225         type Signer = EnforcingSigner;
 226
 227         fn generate_channel_keys_id(&self, _inbound: bool, _channel_value_satoshis: u64, _user_channel_id: u128) -> [u8; 32] {
 228                 let id = self.rand_bytes_id.fetch_add(1, atomic::Ordering::Relaxed) as u8;
 229                 [id; 32]
 230         }
 231
 232         fn derive_channel_signer(&self, channel_value_satoshis: u64, channel_keys_id: [u8; 32]) -> Self::Signer {
 233                 let secp_ctx = Secp256k1::signing_only();
 234                 let id = channel_keys_id[0];
 235                 let keys = InMemorySigner::new(
 236                         &secp_ctx,
 237                         self.get_node_secret(Recipient::Node).unwrap(),
 238                         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_secret[31]]).unwrap(),
 239                         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_secret[31]]).unwrap(),
 240                         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_secret[31]]).unwrap(),
 241                         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_secret[31]]).unwrap(),
 242                         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_secret[31]]).unwrap(),
 243                         [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_secret[31]],
 244                         channel_value_satoshis,
 245                         channel_keys_id,
 246                 );
 247                 let revoked_commitment = self.make_enforcement_state_cell(keys.commitment_seed);
 248                 EnforcingSigner::new_with_revoked(keys, revoked_commitment, false)
 249         }
 250
 251         fn read_chan_signer(&self, buffer: &[u8]) -> Result<Self::Signer, DecodeError> {
 252                 let mut reader = std::io::Cursor::new(buffer);
 253
 254                 let inner: InMemorySigner = ReadableArgs::read(&mut reader, self.get_node_secret(Recipient::Node).unwrap())?;
 255                 let state = self.make_enforcement_state_cell(inner.commitment_seed);
 256
 257                 Ok(EnforcingSigner {
 258                         inner,
 259                         state,
 260                         disable_revocation_policy_check: false,
 261                 })
 262         }
 263
 264         fn get_destination_script(&self) -> Script {
 265                 let secp_ctx = Secp256k1::signing_only();
 266                 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_secret[31]]).unwrap();
 267                 let our_channel_monitor_claim_key_hash = WPubkeyHash::hash(&PublicKey::from_secret_key(&secp_ctx, &channel_monitor_claim_key).serialize());
 268                 Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0).push_slice(&our_channel_monitor_claim_key_hash[..]).into_script()
 269         }
 270
 271         fn get_shutdown_scriptpubkey(&self) -> ShutdownScript {
 272                 let secp_ctx = Secp256k1::signing_only();
 273                 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_secret[31]]).unwrap();
 274                 let pubkey_hash = WPubkeyHash::hash(&PublicKey::from_secret_key(&secp_ctx, &secret_key).serialize());
 275                 ShutdownScript::new_p2wpkh(&pubkey_hash)
 276         }
 277 }
 278
 279 impl KeyProvider {
 280         fn make_enforcement_state_cell(&self, commitment_seed: [u8; 32]) -> Arc<Mutex<EnforcementState>> {
 281                 let mut revoked_commitments = self.enforcement_states.lock().unwrap();
 282                 if !revoked_commitments.contains_key(&commitment_seed) {
 283                         revoked_commitments.insert(commitment_seed, Arc::new(Mutex::new(EnforcementState::new())));
 284                 }
 285                 let cell = revoked_commitments.get(&commitment_seed).unwrap();
 286                 Arc::clone(cell)
 287         }
 288 }
 289
 290 #[inline]
 291 fn check_api_err(api_err: APIError) {
 292         match api_err {
 293                 APIError::APIMisuseError { .. } => panic!("We can't misuse the API"),
 294                 APIError::FeeRateTooHigh { .. } => panic!("We can't send too much fee?"),
 295                 APIError::InvalidRoute { .. } => panic!("Our routes should work"),
 296                 APIError::ChannelUnavailable { err } => {
 297                         // Test the error against a list of errors we can hit, and reject
 298                         // all others. If you hit this panic, the list of acceptable errors
 299                         // is probably just stale and you should add new messages here.
 300                         match err.as_str() {
 301                                 "Peer for first hop currently disconnected/pending monitor update!" => {},
 302                                 _ if err.starts_with("Cannot push more than their max accepted HTLCs ") => {},
 303                                 _ if err.starts_with("Cannot send value that would put us over the max HTLC value in flight our peer will accept ") => {},
 304                                 _ if err.starts_with("Cannot send value that would put our balance under counterparty-announced channel reserve value") => {},
 305                                 _ if err.starts_with("Cannot send value that would put counterparty balance under holder-announced channel reserve value") => {},
 306                                 _ if err.starts_with("Cannot send value that would overdraw remaining funds.") => {},
 307                                 _ if err.starts_with("Cannot send value that would not leave enough to pay for fees.") => {},
 308                                 _ if err.starts_with("Cannot send value that would put our exposure to dust HTLCs at") => {},
 309                                 _ => panic!("{}", err),
 310                         }
 311                 },
 312                 APIError::MonitorUpdateInProgress => {
 313                         // We can (obviously) temp-fail a monitor update
 314                 },
 315                 APIError::IncompatibleShutdownScript { .. } => panic!("Cannot send an incompatible shutdown script"),
 316         }
 317 }
 318 #[inline]
 319 fn check_payment_err(send_err: PaymentSendFailure) {
 320         match send_err {
 321                 PaymentSendFailure::ParameterError(api_err) => check_api_err(api_err),
 322                 PaymentSendFailure::PathParameterError(per_path_results) => {
 323                         for res in per_path_results { if let Err(api_err) = res { check_api_err(api_err); } }
 324                 },
 325                 PaymentSendFailure::AllFailedResendSafe(per_path_results) => {
 326                         for api_err in per_path_results { check_api_err(api_err); }
 327                 },
 328                 PaymentSendFailure::PartialFailure { results, .. } => {
 329                         for res in results { if let Err(api_err) = res { check_api_err(api_err); } }
 330                 },
 331                 PaymentSendFailure::DuplicatePayment => panic!(),
 332         }
 333 }
 334
 335 type ChanMan<'a> = ChannelManager<Arc<TestChainMonitor>, Arc<TestBroadcaster>, Arc<KeyProvider>, Arc<KeyProvider>, Arc<KeyProvider>, Arc<FuzzEstimator>, &'a FuzzRouter, Arc<dyn Logger>>;
 336
 337 #[inline]
 338 fn get_payment_secret_hash(dest: &ChanMan, payment_id: &mut u8) -> Option<(PaymentSecret, PaymentHash)> {
 339         let mut payment_hash;
 340         for _ in 0..256 {
 341                 payment_hash = PaymentHash(Sha256::hash(&[*payment_id; 1]).into_inner());
 342                 if let Ok(payment_secret) = dest.create_inbound_payment_for_hash(payment_hash, None, 3600) {
 343                         return Some((payment_secret, payment_hash));
 344                 }
 345                 *payment_id = payment_id.wrapping_add(1);
 346         }
 347         None
 348 }
 349
 350 #[inline]
 351 fn send_payment(source: &ChanMan, dest: &ChanMan, dest_chan_id: u64, amt: u64, payment_id: &mut u8, payment_idx: &mut u64) -> bool {
 352         let (payment_secret, payment_hash) =
 353                 if let Some((secret, hash)) = get_payment_secret_hash(dest, payment_id) { (secret, hash) } else { return true; };
 354         let mut payment_id = [0; 32];
 355         payment_id[0..8].copy_from_slice(&payment_idx.to_ne_bytes());
 356         *payment_idx += 1;
 357         if let Err(err) = source.send_payment(&Route {
 358                 paths: vec![vec![RouteHop {
 359                         pubkey: dest.get_our_node_id(),
 360                         node_features: dest.node_features(),
 361                         short_channel_id: dest_chan_id,
 362                         channel_features: dest.channel_features(),
 363                         fee_msat: amt,
 364                         cltv_expiry_delta: 200,
 365                 }]],
 366                 payment_params: None,
 367         }, payment_hash, &Some(payment_secret), PaymentId(payment_id)) {
 368                 check_payment_err(err);
 369                 false
 370         } else { true }
 371 }
 372 #[inline]
 373 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 {
 374         let (payment_secret, payment_hash) =
 375                 if let Some((secret, hash)) = get_payment_secret_hash(dest, payment_id) { (secret, hash) } else { return true; };
 376         let mut payment_id = [0; 32];
 377         payment_id[0..8].copy_from_slice(&payment_idx.to_ne_bytes());
 378         *payment_idx += 1;
 379         if let Err(err) = source.send_payment(&Route {
 380                 paths: vec![vec![RouteHop {
 381                         pubkey: middle.get_our_node_id(),
 382                         node_features: middle.node_features(),
 383                         short_channel_id: middle_chan_id,
 384                         channel_features: middle.channel_features(),
 385                         fee_msat: 50000,
 386                         cltv_expiry_delta: 100,
 387                 },RouteHop {
 388                         pubkey: dest.get_our_node_id(),
 389                         node_features: dest.node_features(),
 390                         short_channel_id: dest_chan_id,
 391                         channel_features: dest.channel_features(),
 392                         fee_msat: amt,
 393                         cltv_expiry_delta: 200,
 394                 }]],
 395                 payment_params: None,
 396         }, payment_hash, &Some(payment_secret), PaymentId(payment_id)) {
 397                 check_payment_err(err);
 398                 false
 399         } else { true }
 400 }
 401
 402 #[inline]
 403 pub fn do_test<Out: Output>(data: &[u8], underlying_out: Out) {
 404         let out = SearchingOutput::new(underlying_out);
 405         let broadcast = Arc::new(TestBroadcaster{});
 406         let router = FuzzRouter {};
 407
 408         macro_rules! make_node {
 409                 ($node_id: expr, $fee_estimator: expr) => { {
 410                         let logger: Arc<dyn Logger> = Arc::new(test_logger::TestLogger::new($node_id.to_string(), out.clone()));
 411                         let node_secret = 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, $node_id]).unwrap();
 412                         let keys_manager = Arc::new(KeyProvider { node_secret, rand_bytes_id: atomic::AtomicU32::new(0), enforcement_states: Mutex::new(HashMap::new()) });
 413                         let monitor = Arc::new(TestChainMonitor::new(broadcast.clone(), logger.clone(), $fee_estimator.clone(),
 414                                 Arc::new(TestPersister {
 415                                         update_ret: Mutex::new(ChannelMonitorUpdateStatus::Completed)
 416                                 }), Arc::clone(&keys_manager)));
 417
 418                         let mut config = UserConfig::default();
 419                         config.channel_config.forwarding_fee_proportional_millionths = 0;
 420                         config.channel_handshake_config.announced_channel = true;
 421                         let network = Network::Bitcoin;
 422                         let params = ChainParameters {
 423                                 network,
 424                                 best_block: BestBlock::from_genesis(network),
 425                         };
 426                         (ChannelManager::new($fee_estimator.clone(), monitor.clone(), broadcast.clone(), &router, Arc::clone(&logger), keys_manager.clone(), keys_manager.clone(), keys_manager.clone(), config, params),
 427                         monitor, keys_manager)
 428                 } }
 429         }
 430
 431         macro_rules! reload_node {
 432                 ($ser: expr, $node_id: expr, $old_monitors: expr, $keys_manager: expr, $fee_estimator: expr) => { {
 433                     let keys_manager = Arc::clone(& $keys_manager);
 434                         let logger: Arc<dyn Logger> = Arc::new(test_logger::TestLogger::new($node_id.to_string(), out.clone()));
 435                         let chain_monitor = Arc::new(TestChainMonitor::new(broadcast.clone(), logger.clone(), $fee_estimator.clone(),
 436                                 Arc::new(TestPersister {
 437                                         update_ret: Mutex::new(ChannelMonitorUpdateStatus::Completed)
 438                                 }), Arc::clone(& $keys_manager)));
 439
 440                         let mut config = UserConfig::default();
 441                         config.channel_config.forwarding_fee_proportional_millionths = 0;
 442                         config.channel_handshake_config.announced_channel = true;
 443
 444                         let mut monitors = HashMap::new();
 445                         let mut old_monitors = $old_monitors.latest_monitors.lock().unwrap();
 446                         for (outpoint, (update_id, monitor_ser)) in old_monitors.drain() {
 447                                 monitors.insert(outpoint, <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(&mut Cursor::new(&monitor_ser), (&*$keys_manager, &*$keys_manager)).expect("Failed to read monitor").1);
 448                                 chain_monitor.latest_monitors.lock().unwrap().insert(outpoint, (update_id, monitor_ser));
 449                         }
 450                         let mut monitor_refs = HashMap::new();
 451                         for (outpoint, monitor) in monitors.iter_mut() {
 452                                 monitor_refs.insert(*outpoint, monitor);
 453                         }
 454
 455                         let read_args = ChannelManagerReadArgs {
 456                                 entropy_source: keys_manager.clone(),
 457                                 node_signer: keys_manager.clone(),
 458                                 signer_provider: keys_manager.clone(),
 459                                 fee_estimator: $fee_estimator.clone(),
 460                                 chain_monitor: chain_monitor.clone(),
 461                                 tx_broadcaster: broadcast.clone(),
 462                                 router: &router,
 463                                 logger,
 464                                 default_config: config,
 465                                 channel_monitors: monitor_refs,
 466                         };
 467
 468                         let res = (<(BlockHash, ChanMan)>::read(&mut Cursor::new(&$ser.0), read_args).expect("Failed to read manager").1, chain_monitor.clone());
 469                         for (funding_txo, mon) in monitors.drain() {
 470                                 assert_eq!(chain_monitor.chain_monitor.watch_channel(funding_txo, mon),
 471                                         ChannelMonitorUpdateStatus::Completed);
 472                         }
 473                         res
 474                 } }
 475         }
 476
 477         let mut channel_txn = Vec::new();
 478         macro_rules! make_channel {
 479                 ($source: expr, $dest: expr, $chan_id: expr) => { {
 480                         $source.peer_connected(&$dest.get_our_node_id(), &Init { features: $dest.init_features(), remote_network_address: None }).unwrap();
 481                         $dest.peer_connected(&$source.get_our_node_id(), &Init { features: $source.init_features(), remote_network_address: None }).unwrap();
 482
 483                         $source.create_channel($dest.get_our_node_id(), 100_000, 42, 0, None).unwrap();
 484                         let open_channel = {
 485                                 let events = $source.get_and_clear_pending_msg_events();
 486                                 assert_eq!(events.len(), 1);
 487                                 if let events::MessageSendEvent::SendOpenChannel { ref msg, .. } = events[0] {
 488                                         msg.clone()
 489                                 } else { panic!("Wrong event type"); }
 490                         };
 491
 492                         $dest.handle_open_channel(&$source.get_our_node_id(), &open_channel);
 493                         let accept_channel = {
 494                                 let events = $dest.get_and_clear_pending_msg_events();
 495                                 assert_eq!(events.len(), 1);
 496                                 if let events::MessageSendEvent::SendAcceptChannel { ref msg, .. } = events[0] {
 497                                         msg.clone()
 498                                 } else { panic!("Wrong event type"); }
 499                         };
 500
 501                         $source.handle_accept_channel(&$dest.get_our_node_id(), &accept_channel);
 502                         let funding_output;
 503                         {
 504                                 let events = $source.get_and_clear_pending_events();
 505                                 assert_eq!(events.len(), 1);
 506                                 if let events::Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, .. } = events[0] {
 507                                         let tx = Transaction { version: $chan_id, lock_time: PackedLockTime::ZERO, input: Vec::new(), output: vec![TxOut {
 508                                                 value: *channel_value_satoshis, script_pubkey: output_script.clone(),
 509                                         }]};
 510                                         funding_output = OutPoint { txid: tx.txid(), index: 0 };
 511                                         $source.funding_transaction_generated(&temporary_channel_id, &$dest.get_our_node_id(), tx.clone()).unwrap();
 512                                         channel_txn.push(tx);
 513                                 } else { panic!("Wrong event type"); }
 514                         }
 515
 516                         let funding_created = {
 517                                 let events = $source.get_and_clear_pending_msg_events();
 518                                 assert_eq!(events.len(), 1);
 519                                 if let events::MessageSendEvent::SendFundingCreated { ref msg, .. } = events[0] {
 520                                         msg.clone()
 521                                 } else { panic!("Wrong event type"); }
 522                         };
 523                         $dest.handle_funding_created(&$source.get_our_node_id(), &funding_created);
 524
 525                         let funding_signed = {
 526                                 let events = $dest.get_and_clear_pending_msg_events();
 527                                 assert_eq!(events.len(), 1);
 528                                 if let events::MessageSendEvent::SendFundingSigned { ref msg, .. } = events[0] {
 529                                         msg.clone()
 530                                 } else { panic!("Wrong event type"); }
 531                         };
 532                         $source.handle_funding_signed(&$dest.get_our_node_id(), &funding_signed);
 533
 534                         funding_output
 535                 } }
 536         }
 537
 538         macro_rules! confirm_txn {
 539                 ($node: expr) => { {
 540                         let chain_hash = genesis_block(Network::Bitcoin).block_hash();
 541                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: chain_hash, merkle_root: TxMerkleNode::all_zeros(), time: 42, bits: 42, nonce: 42 };
 542                         let txdata: Vec<_> = channel_txn.iter().enumerate().map(|(i, tx)| (i + 1, tx)).collect();
 543                         $node.transactions_confirmed(&header, &txdata, 1);
 544                         for _ in 2..100 {
 545                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.block_hash(), merkle_root: TxMerkleNode::all_zeros(), time: 42, bits: 42, nonce: 42 };
 546                         }
 547                         $node.best_block_updated(&header, 99);
 548                 } }
 549         }
 550
 551         macro_rules! lock_fundings {
 552                 ($nodes: expr) => { {
 553                         let mut node_events = Vec::new();
 554                         for node in $nodes.iter() {
 555                                 node_events.push(node.get_and_clear_pending_msg_events());
 556                         }
 557                         for (idx, node_event) in node_events.iter().enumerate() {
 558                                 for event in node_event {
 559                                         if let events::MessageSendEvent::SendChannelReady { ref node_id, ref msg } = event {
 560                                                 for node in $nodes.iter() {
 561                                                         if node.get_our_node_id() == *node_id {
 562                                                                 node.handle_channel_ready(&$nodes[idx].get_our_node_id(), msg);
 563                                                         }
 564                                                 }
 565                                         } else { panic!("Wrong event type"); }
 566                                 }
 567                         }
 568
 569                         for node in $nodes.iter() {
 570                                 let events = node.get_and_clear_pending_msg_events();
 571                                 for event in events {
 572                                         if let events::MessageSendEvent::SendAnnouncementSignatures { .. } = event {
 573                                         } else { panic!("Wrong event type"); }
 574                                 }
 575                         }
 576                 } }
 577         }
 578
 579         let fee_est_a = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 580         let mut last_htlc_clear_fee_a =  253;
 581         let fee_est_b = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 582         let mut last_htlc_clear_fee_b =  253;
 583         let fee_est_c = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 584         let mut last_htlc_clear_fee_c =  253;
 585
 586         // 3 nodes is enough to hit all the possible cases, notably unknown-source-unknown-dest
 587         // forwarding.
 588         let (node_a, mut monitor_a, keys_manager_a) = make_node!(0, fee_est_a);
 589         let (node_b, mut monitor_b, keys_manager_b) = make_node!(1, fee_est_b);
 590         let (node_c, mut monitor_c, keys_manager_c) = make_node!(2, fee_est_c);
 591
 592         let mut nodes = [node_a, node_b, node_c];
 593
 594         let chan_1_funding = make_channel!(nodes[0], nodes[1], 0);
 595         let chan_2_funding = make_channel!(nodes[1], nodes[2], 1);
 596
 597         for node in nodes.iter() {
 598                 confirm_txn!(node);
 599         }
 600
 601         lock_fundings!(nodes);
 602
 603         let chan_a = nodes[0].list_usable_channels()[0].short_channel_id.unwrap();
 604         let chan_b = nodes[2].list_usable_channels()[0].short_channel_id.unwrap();
 605
 606         let mut payment_id: u8 = 0;
 607         let mut payment_idx: u64 = 0;
 608
 609         let mut chan_a_disconnected = false;
 610         let mut chan_b_disconnected = false;
 611         let mut ab_events = Vec::new();
 612         let mut ba_events = Vec::new();
 613         let mut bc_events = Vec::new();
 614         let mut cb_events = Vec::new();
 615
 616         let mut node_a_ser = VecWriter(Vec::new());
 617         nodes[0].write(&mut node_a_ser).unwrap();
 618         let mut node_b_ser = VecWriter(Vec::new());
 619         nodes[1].write(&mut node_b_ser).unwrap();
 620         let mut node_c_ser = VecWriter(Vec::new());
 621         nodes[2].write(&mut node_c_ser).unwrap();
 622
 623         macro_rules! test_return {
 624                 () => { {
 625                         assert_eq!(nodes[0].list_channels().len(), 1);
 626                         assert_eq!(nodes[1].list_channels().len(), 2);
 627                         assert_eq!(nodes[2].list_channels().len(), 1);
 628                         return;
 629                 } }
 630         }
 631
 632         let mut read_pos = 0;
 633         macro_rules! get_slice {
 634                 ($len: expr) => {
 635                         {
 636                                 let slice_len = $len as usize;
 637                                 if data.len() < read_pos + slice_len {
 638                                         test_return!();
 639                                 }
 640                                 read_pos += slice_len;
 641                                 &data[read_pos - slice_len..read_pos]
 642                         }
 643                 }
 644         }
 645
 646         loop {
 647                 // Push any events from Node B onto ba_events and bc_events
 648                 macro_rules! push_excess_b_events {
 649                         ($excess_events: expr, $expect_drop_node: expr) => { {
 650                                 let a_id = nodes[0].get_our_node_id();
 651                                 let expect_drop_node: Option<usize> = $expect_drop_node;
 652                                 let expect_drop_id = if let Some(id) = expect_drop_node { Some(nodes[id].get_our_node_id()) } else { None };
 653                                 for event in $excess_events {
 654                                         let push_a = match event {
 655                                                 events::MessageSendEvent::UpdateHTLCs { ref node_id, .. } => {
 656                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 657                                                         *node_id == a_id
 658                                                 },
 659                                                 events::MessageSendEvent::SendRevokeAndACK { ref node_id, .. } => {
 660                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 661                                                         *node_id == a_id
 662                                                 },
 663                                                 events::MessageSendEvent::SendChannelReestablish { ref node_id, .. } => {
 664                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 665                                                         *node_id == a_id
 666                                                 },
 667                                                 events::MessageSendEvent::SendChannelReady { .. } => continue,
 668                                                 events::MessageSendEvent::SendAnnouncementSignatures { .. } => continue,
 669                                                 events::MessageSendEvent::SendChannelUpdate { ref node_id, ref msg } => {
 670                                                         assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 671                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 672                                                         *node_id == a_id
 673                                                 },
 674                                                 _ => panic!("Unhandled message event {:?}", event),
 675                                         };
 676                                         if push_a { ba_events.push(event); } else { bc_events.push(event); }
 677                                 }
 678                         } }
 679                 }
 680
 681                 // While delivering messages, we select across three possible message selection processes
 682                 // to ensure we get as much coverage as possible. See the individual enum variants for more
 683                 // details.
 684                 #[derive(PartialEq)]
 685                 enum ProcessMessages {
 686                         /// Deliver all available messages, including fetching any new messages from
 687                         /// `get_and_clear_pending_msg_events()` (which may have side effects).
 688                         AllMessages,
 689                         /// Call `get_and_clear_pending_msg_events()` first, and then deliver up to one
 690                         /// message (which may already be queued).
 691                         OneMessage,
 692                         /// Deliver up to one already-queued message. This avoids any potential side-effects
 693                         /// of `get_and_clear_pending_msg_events()` (eg freeing the HTLC holding cell), which
 694                         /// provides potentially more coverage.
 695                         OnePendingMessage,
 696                 }
 697
 698                 macro_rules! process_msg_events {
 699                         ($node: expr, $corrupt_forward: expr, $limit_events: expr) => { {
 700                                 let mut events = if $node == 1 {
 701                                         let mut new_events = Vec::new();
 702                                         mem::swap(&mut new_events, &mut ba_events);
 703                                         new_events.extend_from_slice(&bc_events[..]);
 704                                         bc_events.clear();
 705                                         new_events
 706                                 } else if $node == 0 {
 707                                         let mut new_events = Vec::new();
 708                                         mem::swap(&mut new_events, &mut ab_events);
 709                                         new_events
 710                                 } else {
 711                                         let mut new_events = Vec::new();
 712                                         mem::swap(&mut new_events, &mut cb_events);
 713                                         new_events
 714                                 };
 715                                 let mut new_events = Vec::new();
 716                                 if $limit_events != ProcessMessages::OnePendingMessage {
 717                                         new_events = nodes[$node].get_and_clear_pending_msg_events();
 718                                 }
 719                                 let mut had_events = false;
 720                                 let mut events_iter = events.drain(..).chain(new_events.drain(..));
 721                                 let mut extra_ev = None;
 722                                 for event in &mut events_iter {
 723                                         had_events = true;
 724                                         match event {
 725                                                 events::MessageSendEvent::UpdateHTLCs { node_id, updates: CommitmentUpdate { update_add_htlcs, update_fail_htlcs, update_fulfill_htlcs, update_fail_malformed_htlcs, update_fee, commitment_signed } } => {
 726                                                         for (idx, dest) in nodes.iter().enumerate() {
 727                                                                 if dest.get_our_node_id() == node_id {
 728                                                                         for update_add in update_add_htlcs.iter() {
 729                                                                                 out.locked_write(format!("Delivering update_add_htlc to node {}.\n", idx).as_bytes());
 730                                                                                 if !$corrupt_forward {
 731                                                                                         dest.handle_update_add_htlc(&nodes[$node].get_our_node_id(), update_add);
 732                                                                                 } else {
 733                                                                                         // Corrupt the update_add_htlc message so that its HMAC
 734                                                                                         // check will fail and we generate a
 735                                                                                         // update_fail_malformed_htlc instead of an
 736                                                                                         // update_fail_htlc as we do when we reject a payment.
 737                                                                                         let mut msg_ser = update_add.encode();
 738                                                                                         msg_ser[1000] ^= 0xff;
 739                                                                                         let new_msg = UpdateAddHTLC::read(&mut Cursor::new(&msg_ser)).unwrap();
 740                                                                                         dest.handle_update_add_htlc(&nodes[$node].get_our_node_id(), &new_msg);
 741                                                                                 }
 742                                                                         }
 743                                                                         for update_fulfill in update_fulfill_htlcs.iter() {
 744                                                                                 out.locked_write(format!("Delivering update_fulfill_htlc to node {}.\n", idx).as_bytes());
 745                                                                                 dest.handle_update_fulfill_htlc(&nodes[$node].get_our_node_id(), update_fulfill);
 746                                                                         }
 747                                                                         for update_fail in update_fail_htlcs.iter() {
 748                                                                                 out.locked_write(format!("Delivering update_fail_htlc to node {}.\n", idx).as_bytes());
 749                                                                                 dest.handle_update_fail_htlc(&nodes[$node].get_our_node_id(), update_fail);
 750                                                                         }
 751                                                                         for update_fail_malformed in update_fail_malformed_htlcs.iter() {
 752                                                                                 out.locked_write(format!("Delivering update_fail_malformed_htlc to node {}.\n", idx).as_bytes());
 753                                                                                 dest.handle_update_fail_malformed_htlc(&nodes[$node].get_our_node_id(), update_fail_malformed);
 754                                                                         }
 755                                                                         if let Some(msg) = update_fee {
 756                                                                                 out.locked_write(format!("Delivering update_fee to node {}.\n", idx).as_bytes());
 757                                                                                 dest.handle_update_fee(&nodes[$node].get_our_node_id(), &msg);
 758                                                                         }
 759                                                                         let processed_change = !update_add_htlcs.is_empty() || !update_fulfill_htlcs.is_empty() ||
 760                                                                                 !update_fail_htlcs.is_empty() || !update_fail_malformed_htlcs.is_empty();
 761                                                                         if $limit_events != ProcessMessages::AllMessages && processed_change {
 762                                                                                 // If we only want to process some messages, don't deliver the CS until later.
 763                                                                                 extra_ev = Some(events::MessageSendEvent::UpdateHTLCs { node_id, updates: CommitmentUpdate {
 764                                                                                         update_add_htlcs: Vec::new(),
 765                                                                                         update_fail_htlcs: Vec::new(),
 766                                                                                         update_fulfill_htlcs: Vec::new(),
 767                                                                                         update_fail_malformed_htlcs: Vec::new(),
 768                                                                                         update_fee: None,
 769                                                                                         commitment_signed
 770                                                                                 } });
 771                                                                                 break;
 772                                                                         }
 773                                                                         out.locked_write(format!("Delivering commitment_signed to node {}.\n", idx).as_bytes());
 774                                                                         dest.handle_commitment_signed(&nodes[$node].get_our_node_id(), &commitment_signed);
 775                                                                         break;
 776                                                                 }
 777                                                         }
 778                                                 },
 779                                                 events::MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
 780                                                         for (idx, dest) in nodes.iter().enumerate() {
 781                                                                 if dest.get_our_node_id() == *node_id {
 782                                                                         out.locked_write(format!("Delivering revoke_and_ack to node {}.\n", idx).as_bytes());
 783                                                                         dest.handle_revoke_and_ack(&nodes[$node].get_our_node_id(), msg);
 784                                                                 }
 785                                                         }
 786                                                 },
 787                                                 events::MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
 788                                                         for (idx, dest) in nodes.iter().enumerate() {
 789                                                                 if dest.get_our_node_id() == *node_id {
 790                                                                         out.locked_write(format!("Delivering channel_reestablish to node {}.\n", idx).as_bytes());
 791                                                                         dest.handle_channel_reestablish(&nodes[$node].get_our_node_id(), msg);
 792                                                                 }
 793                                                         }
 794                                                 },
 795                                                 events::MessageSendEvent::SendChannelReady { .. } => {
 796                                                         // Can be generated as a reestablish response
 797                                                 },
 798                                                 events::MessageSendEvent::SendAnnouncementSignatures { .. } => {
 799                                                         // Can be generated as a reestablish response
 800                                                 },
 801                                                 events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 802                                                         // When we reconnect we will resend a channel_update to make sure our
 803                                                         // counterparty has the latest parameters for receiving payments
 804                                                         // through us. We do, however, check that the message does not include
 805                                                         // the "disabled" bit, as we should never ever have a channel which is
 806                                                         // disabled when we send such an update (or it may indicate channel
 807                                                         // force-close which we should detect as an error).
 808                                                         assert_eq!(msg.contents.flags & 2, 0);
 809                                                 },
 810                                                 _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 811                                                         return;
 812                                                 } else {
 813                                                         panic!("Unhandled message event {:?}", event)
 814                                                 },
 815                                         }
 816                                         if $limit_events != ProcessMessages::AllMessages {
 817                                                 break;
 818                                         }
 819                                 }
 820                                 if $node == 1 {
 821                                         push_excess_b_events!(extra_ev.into_iter().chain(events_iter), None);
 822                                 } else if $node == 0 {
 823                                         if let Some(ev) = extra_ev { ab_events.push(ev); }
 824                                         for event in events_iter { ab_events.push(event); }
 825                                 } else {
 826                                         if let Some(ev) = extra_ev { cb_events.push(ev); }
 827                                         for event in events_iter { cb_events.push(event); }
 828                                 }
 829                                 had_events
 830                         } }
 831                 }
 832
 833                 macro_rules! drain_msg_events_on_disconnect {
 834                         ($counterparty_id: expr) => { {
 835                                 if $counterparty_id == 0 {
 836                                         for event in nodes[0].get_and_clear_pending_msg_events() {
 837                                                 match event {
 838                                                         events::MessageSendEvent::UpdateHTLCs { .. } => {},
 839                                                         events::MessageSendEvent::SendRevokeAndACK { .. } => {},
 840                                                         events::MessageSendEvent::SendChannelReestablish { .. } => {},
 841                                                         events::MessageSendEvent::SendChannelReady { .. } => {},
 842                                                         events::MessageSendEvent::SendAnnouncementSignatures { .. } => {},
 843                                                         events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 844                                                                 assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 845                                                         },
 846                                                         _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 847                                                                 return;
 848                                                         } else {
 849                                                                 panic!("Unhandled message event")
 850                                                         },
 851                                                 }
 852                                         }
 853                                         push_excess_b_events!(nodes[1].get_and_clear_pending_msg_events().drain(..), Some(0));
 854                                         ab_events.clear();
 855                                         ba_events.clear();
 856                                 } else {
 857                                         for event in nodes[2].get_and_clear_pending_msg_events() {
 858                                                 match event {
 859                                                         events::MessageSendEvent::UpdateHTLCs { .. } => {},
 860                                                         events::MessageSendEvent::SendRevokeAndACK { .. } => {},
 861                                                         events::MessageSendEvent::SendChannelReestablish { .. } => {},
 862                                                         events::MessageSendEvent::SendChannelReady { .. } => {},
 863                                                         events::MessageSendEvent::SendAnnouncementSignatures { .. } => {},
 864                                                         events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 865                                                                 assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 866                                                         },
 867                                                         _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 868                                                                 return;
 869                                                         } else {
 870                                                                 panic!("Unhandled message event")
 871                                                         },
 872                                                 }
 873                                         }
 874                                         push_excess_b_events!(nodes[1].get_and_clear_pending_msg_events().drain(..), Some(2));
 875                                         bc_events.clear();
 876                                         cb_events.clear();
 877                                 }
 878                         } }
 879                 }
 880
 881                 macro_rules! process_events {
 882                         ($node: expr, $fail: expr) => { {
 883                                 // In case we get 256 payments we may have a hash collision, resulting in the
 884                                 // second claim/fail call not finding the duplicate-hash HTLC, so we have to
 885                                 // deduplicate the calls here.
 886                                 let mut claim_set = HashSet::new();
 887                                 let mut events = nodes[$node].get_and_clear_pending_events();
 888                                 // Sort events so that PendingHTLCsForwardable get processed last. This avoids a
 889                                 // case where we first process a PendingHTLCsForwardable, then claim/fail on a
 890                                 // PaymentClaimable, claiming/failing two HTLCs, but leaving a just-generated
 891                                 // PaymentClaimable event for the second HTLC in our pending_events (and breaking
 892                                 // our claim_set deduplication).
 893                                 events.sort_by(|a, b| {
 894                                         if let events::Event::PaymentClaimable { .. } = a {
 895                                                 if let events::Event::PendingHTLCsForwardable { .. } = b {
 896                                                         Ordering::Less
 897                                                 } else { Ordering::Equal }
 898                                         } else if let events::Event::PendingHTLCsForwardable { .. } = a {
 899                                                 if let events::Event::PaymentClaimable { .. } = b {
 900                                                         Ordering::Greater
 901                                                 } else { Ordering::Equal }
 902                                         } else { Ordering::Equal }
 903                                 });
 904                                 let had_events = !events.is_empty();
 905                                 for event in events.drain(..) {
 906                                         match event {
 907                                                 events::Event::PaymentClaimable { payment_hash, .. } => {
 908                                                         if claim_set.insert(payment_hash.0) {
 909                                                                 if $fail {
 910                                                                         nodes[$node].fail_htlc_backwards(&payment_hash);
 911                                                                 } else {
 912                                                                         nodes[$node].claim_funds(PaymentPreimage(payment_hash.0));
 913                                                                 }
 914                                                         }
 915                                                 },
 916                                                 events::Event::PaymentSent { .. } => {},
 917                                                 events::Event::PaymentClaimed { .. } => {},
 918                                                 events::Event::PaymentPathSuccessful { .. } => {},
 919                                                 events::Event::PaymentPathFailed { .. } => {},
 920                                                 events::Event::ProbeSuccessful { .. } | events::Event::ProbeFailed { .. } => {
 921                                                         // Even though we don't explicitly send probes, because probes are
 922                                                         // detected based on hashing the payment hash+preimage, its rather
 923                                                         // trivial for the fuzzer to build payments that accidentally end up
 924                                                         // looking like probes.
 925                                                 },
 926                                                 events::Event::PaymentForwarded { .. } if $node == 1 => {},
 927                                                 events::Event::ChannelReady { .. } => {},
 928                                                 events::Event::PendingHTLCsForwardable { .. } => {
 929                                                         nodes[$node].process_pending_htlc_forwards();
 930                                                 },
 931                                                 events::Event::HTLCHandlingFailed { .. } => {},
 932                                                 _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 933                                                         return;
 934                                                 } else {
 935                                                         panic!("Unhandled event")
 936                                                 },
 937                                         }
 938                                 }
 939                                 had_events
 940                         } }
 941                 }
 942
 943                 let v = get_slice!(1)[0];
 944                 out.locked_write(format!("READ A BYTE! HANDLING INPUT {:x}...........\n", v).as_bytes());
 945                 match v {
 946                         // In general, we keep related message groups close together in binary form, allowing
 947                         // bit-twiddling mutations to have similar effects. This is probably overkill, but no
 948                         // harm in doing so.
 949
 950                         0x00 => *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
 951                         0x01 => *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
 952                         0x02 => *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
 953                         0x04 => *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
 954                         0x05 => *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
 955                         0x06 => *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
 956
 957                         0x08 => {
 958                                 if let Some((id, _)) = monitor_a.latest_monitors.lock().unwrap().get(&chan_1_funding) {
 959                                         monitor_a.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
 960                                         nodes[0].process_monitor_events();
 961                                 }
 962                         },
 963                         0x09 => {
 964                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_1_funding) {
 965                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
 966                                         nodes[1].process_monitor_events();
 967                                 }
 968                         },
 969                         0x0a => {
 970                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_2_funding) {
 971                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
 972                                         nodes[1].process_monitor_events();
 973                                 }
 974                         },
 975                         0x0b => {
 976                                 if let Some((id, _)) = monitor_c.latest_monitors.lock().unwrap().get(&chan_2_funding) {
 977                                         monitor_c.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
 978                                         nodes[2].process_monitor_events();
 979                                 }
 980                         },
 981
 982                         0x0c => {
 983                                 if !chan_a_disconnected {
 984                                         nodes[0].peer_disconnected(&nodes[1].get_our_node_id(), false);
 985                                         nodes[1].peer_disconnected(&nodes[0].get_our_node_id(), false);
 986                                         chan_a_disconnected = true;
 987                                         drain_msg_events_on_disconnect!(0);
 988                                 }
 989                         },
 990                         0x0d => {
 991                                 if !chan_b_disconnected {
 992                                         nodes[1].peer_disconnected(&nodes[2].get_our_node_id(), false);
 993                                         nodes[2].peer_disconnected(&nodes[1].get_our_node_id(), false);
 994                                         chan_b_disconnected = true;
 995                                         drain_msg_events_on_disconnect!(2);
 996                                 }
 997                         },
 998                         0x0e => {
 999                                 if chan_a_disconnected {
1000                                         nodes[0].peer_connected(&nodes[1].get_our_node_id(), &Init { features: nodes[1].init_features(), remote_network_address: None }).unwrap();
1001                                         nodes[1].peer_connected(&nodes[0].get_our_node_id(), &Init { features: nodes[0].init_features(), remote_network_address: None }).unwrap();
1002                                         chan_a_disconnected = false;
1003                                 }
1004                         },
1005                         0x0f => {
1006                                 if chan_b_disconnected {
1007                                         nodes[1].peer_connected(&nodes[2].get_our_node_id(), &Init { features: nodes[2].init_features(), remote_network_address: None }).unwrap();
1008                                         nodes[2].peer_connected(&nodes[1].get_our_node_id(), &Init { features: nodes[1].init_features(), remote_network_address: None }).unwrap();
1009                                         chan_b_disconnected = false;
1010                                 }
1011                         },
1012
1013                         0x10 => { process_msg_events!(0, true, ProcessMessages::AllMessages); },
1014                         0x11 => { process_msg_events!(0, false, ProcessMessages::AllMessages); },
1015                         0x12 => { process_msg_events!(0, true, ProcessMessages::OneMessage); },
1016                         0x13 => { process_msg_events!(0, false, ProcessMessages::OneMessage); },
1017                         0x14 => { process_msg_events!(0, true, ProcessMessages::OnePendingMessage); },
1018                         0x15 => { process_msg_events!(0, false, ProcessMessages::OnePendingMessage); },
1019
1020                         0x16 => { process_events!(0, true); },
1021                         0x17 => { process_events!(0, false); },
1022
1023                         0x18 => { process_msg_events!(1, true, ProcessMessages::AllMessages); },
1024                         0x19 => { process_msg_events!(1, false, ProcessMessages::AllMessages); },
1025                         0x1a => { process_msg_events!(1, true, ProcessMessages::OneMessage); },
1026                         0x1b => { process_msg_events!(1, false, ProcessMessages::OneMessage); },
1027                         0x1c => { process_msg_events!(1, true, ProcessMessages::OnePendingMessage); },
1028                         0x1d => { process_msg_events!(1, false, ProcessMessages::OnePendingMessage); },
1029
1030                         0x1e => { process_events!(1, true); },
1031                         0x1f => { process_events!(1, false); },
1032
1033                         0x20 => { process_msg_events!(2, true, ProcessMessages::AllMessages); },
1034                         0x21 => { process_msg_events!(2, false, ProcessMessages::AllMessages); },
1035                         0x22 => { process_msg_events!(2, true, ProcessMessages::OneMessage); },
1036                         0x23 => { process_msg_events!(2, false, ProcessMessages::OneMessage); },
1037                         0x24 => { process_msg_events!(2, true, ProcessMessages::OnePendingMessage); },
1038                         0x25 => { process_msg_events!(2, false, ProcessMessages::OnePendingMessage); },
1039
1040                         0x26 => { process_events!(2, true); },
1041                         0x27 => { process_events!(2, false); },
1042
1043                         0x2c => {
1044                                 if !chan_a_disconnected {
1045                                         nodes[1].peer_disconnected(&nodes[0].get_our_node_id(), false);
1046                                         chan_a_disconnected = true;
1047                                         drain_msg_events_on_disconnect!(0);
1048                                 }
1049                                 if monitor_a.should_update_manager.load(atomic::Ordering::Relaxed) {
1050                                         node_a_ser.0.clear();
1051                                         nodes[0].write(&mut node_a_ser).unwrap();
1052                                 }
1053                                 let (new_node_a, new_monitor_a) = reload_node!(node_a_ser, 0, monitor_a, keys_manager_a, fee_est_a);
1054                                 nodes[0] = new_node_a;
1055                                 monitor_a = new_monitor_a;
1056                         },
1057                         0x2d => {
1058                                 if !chan_a_disconnected {
1059                                         nodes[0].peer_disconnected(&nodes[1].get_our_node_id(), false);
1060                                         chan_a_disconnected = true;
1061                                         nodes[0].get_and_clear_pending_msg_events();
1062                                         ab_events.clear();
1063                                         ba_events.clear();
1064                                 }
1065                                 if !chan_b_disconnected {
1066                                         nodes[2].peer_disconnected(&nodes[1].get_our_node_id(), false);
1067                                         chan_b_disconnected = true;
1068                                         nodes[2].get_and_clear_pending_msg_events();
1069                                         bc_events.clear();
1070                                         cb_events.clear();
1071                                 }
1072                                 let (new_node_b, new_monitor_b) = reload_node!(node_b_ser, 1, monitor_b, keys_manager_b, fee_est_b);
1073                                 nodes[1] = new_node_b;
1074                                 monitor_b = new_monitor_b;
1075                         },
1076                         0x2e => {
1077                                 if !chan_b_disconnected {
1078                                         nodes[1].peer_disconnected(&nodes[2].get_our_node_id(), false);
1079                                         chan_b_disconnected = true;
1080                                         drain_msg_events_on_disconnect!(2);
1081                                 }
1082                                 if monitor_c.should_update_manager.load(atomic::Ordering::Relaxed) {
1083                                         node_c_ser.0.clear();
1084                                         nodes[2].write(&mut node_c_ser).unwrap();
1085                                 }
1086                                 let (new_node_c, new_monitor_c) = reload_node!(node_c_ser, 2, monitor_c, keys_manager_c, fee_est_c);
1087                                 nodes[2] = new_node_c;
1088                                 monitor_c = new_monitor_c;
1089                         },
1090
1091                         // 1/10th the channel size:
1092                         0x30 => { send_payment(&nodes[0], &nodes[1], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1093                         0x31 => { send_payment(&nodes[1], &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1094                         0x32 => { send_payment(&nodes[1], &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1095                         0x33 => { send_payment(&nodes[2], &nodes[1], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1096                         0x34 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1097                         0x35 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1098
1099                         0x38 => { send_payment(&nodes[0], &nodes[1], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1100                         0x39 => { send_payment(&nodes[1], &nodes[0], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1101                         0x3a => { send_payment(&nodes[1], &nodes[2], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1102                         0x3b => { send_payment(&nodes[2], &nodes[1], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1103                         0x3c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1104                         0x3d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1105
1106                         0x40 => { send_payment(&nodes[0], &nodes[1], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1107                         0x41 => { send_payment(&nodes[1], &nodes[0], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1108                         0x42 => { send_payment(&nodes[1], &nodes[2], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1109                         0x43 => { send_payment(&nodes[2], &nodes[1], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1110                         0x44 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1111                         0x45 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1112
1113                         0x48 => { send_payment(&nodes[0], &nodes[1], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1114                         0x49 => { send_payment(&nodes[1], &nodes[0], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1115                         0x4a => { send_payment(&nodes[1], &nodes[2], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1116                         0x4b => { send_payment(&nodes[2], &nodes[1], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1117                         0x4c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1118                         0x4d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1119
1120                         0x50 => { send_payment(&nodes[0], &nodes[1], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1121                         0x51 => { send_payment(&nodes[1], &nodes[0], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1122                         0x52 => { send_payment(&nodes[1], &nodes[2], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1123                         0x53 => { send_payment(&nodes[2], &nodes[1], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1124                         0x54 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1125                         0x55 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1126
1127                         0x58 => { send_payment(&nodes[0], &nodes[1], chan_a, 100, &mut payment_id, &mut payment_idx); },
1128                         0x59 => { send_payment(&nodes[1], &nodes[0], chan_a, 100, &mut payment_id, &mut payment_idx); },
1129                         0x5a => { send_payment(&nodes[1], &nodes[2], chan_b, 100, &mut payment_id, &mut payment_idx); },
1130                         0x5b => { send_payment(&nodes[2], &nodes[1], chan_b, 100, &mut payment_id, &mut payment_idx); },
1131                         0x5c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 100, &mut payment_id, &mut payment_idx); },
1132                         0x5d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 100, &mut payment_id, &mut payment_idx); },
1133
1134                         0x60 => { send_payment(&nodes[0], &nodes[1], chan_a, 10, &mut payment_id, &mut payment_idx); },
1135                         0x61 => { send_payment(&nodes[1], &nodes[0], chan_a, 10, &mut payment_id, &mut payment_idx); },
1136                         0x62 => { send_payment(&nodes[1], &nodes[2], chan_b, 10, &mut payment_id, &mut payment_idx); },
1137                         0x63 => { send_payment(&nodes[2], &nodes[1], chan_b, 10, &mut payment_id, &mut payment_idx); },
1138                         0x64 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10, &mut payment_id, &mut payment_idx); },
1139                         0x65 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10, &mut payment_id, &mut payment_idx); },
1140
1141                         0x68 => { send_payment(&nodes[0], &nodes[1], chan_a, 1, &mut payment_id, &mut payment_idx); },
1142                         0x69 => { send_payment(&nodes[1], &nodes[0], chan_a, 1, &mut payment_id, &mut payment_idx); },
1143                         0x6a => { send_payment(&nodes[1], &nodes[2], chan_b, 1, &mut payment_id, &mut payment_idx); },
1144                         0x6b => { send_payment(&nodes[2], &nodes[1], chan_b, 1, &mut payment_id, &mut payment_idx); },
1145                         0x6c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1, &mut payment_id, &mut payment_idx); },
1146                         0x6d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1, &mut payment_id, &mut payment_idx); },
1147
1148                         0x80 => {
1149                                 let max_feerate = last_htlc_clear_fee_a * FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1150                                 if fee_est_a.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1151                                         fee_est_a.ret_val.store(max_feerate, atomic::Ordering::Release);
1152                                 }
1153                                 nodes[0].maybe_update_chan_fees();
1154                         },
1155                         0x81 => { fee_est_a.ret_val.store(253, atomic::Ordering::Release); nodes[0].maybe_update_chan_fees(); },
1156
1157                         0x84 => {
1158                                 let max_feerate = last_htlc_clear_fee_b * FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1159                                 if fee_est_b.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1160                                         fee_est_b.ret_val.store(max_feerate, atomic::Ordering::Release);
1161                                 }
1162                                 nodes[1].maybe_update_chan_fees();
1163                         },
1164                         0x85 => { fee_est_b.ret_val.store(253, atomic::Ordering::Release); nodes[1].maybe_update_chan_fees(); },
1165
1166                         0x88 => {
1167                                 let max_feerate = last_htlc_clear_fee_c * FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1168                                 if fee_est_c.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1169                                         fee_est_c.ret_val.store(max_feerate, atomic::Ordering::Release);
1170                                 }
1171                                 nodes[2].maybe_update_chan_fees();
1172                         },
1173                         0x89 => { fee_est_c.ret_val.store(253, atomic::Ordering::Release); nodes[2].maybe_update_chan_fees(); },
1174
1175                         0xff => {
1176                                 // Test that no channel is in a stuck state where neither party can send funds even
1177                                 // after we resolve all pending events.
1178                                 // First make sure there are no pending monitor updates, resetting the error state
1179                                 // and calling force_channel_monitor_updated for each monitor.
1180                                 *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1181                                 *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1182                                 *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1183
1184                                 if let Some((id, _)) = monitor_a.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1185                                         monitor_a.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
1186                                         nodes[0].process_monitor_events();
1187                                 }
1188                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1189                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
1190                                         nodes[1].process_monitor_events();
1191                                 }
1192                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1193                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1194                                         nodes[1].process_monitor_events();
1195                                 }
1196                                 if let Some((id, _)) = monitor_c.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1197                                         monitor_c.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1198                                         nodes[2].process_monitor_events();
1199                                 }
1200
1201                                 // Next, make sure peers are all connected to each other
1202                                 if chan_a_disconnected {
1203                                         nodes[0].peer_connected(&nodes[1].get_our_node_id(), &Init { features: nodes[1].init_features(), remote_network_address: None }).unwrap();
1204                                         nodes[1].peer_connected(&nodes[0].get_our_node_id(), &Init { features: nodes[0].init_features(), remote_network_address: None }).unwrap();
1205                                         chan_a_disconnected = false;
1206                                 }
1207                                 if chan_b_disconnected {
1208                                         nodes[1].peer_connected(&nodes[2].get_our_node_id(), &Init { features: nodes[2].init_features(), remote_network_address: None }).unwrap();
1209                                         nodes[2].peer_connected(&nodes[1].get_our_node_id(), &Init { features: nodes[1].init_features(), remote_network_address: None }).unwrap();
1210                                         chan_b_disconnected = false;
1211                                 }
1212
1213                                 for i in 0..std::usize::MAX {
1214                                         if i == 100 { panic!("It may take may iterations to settle the state, but it should not take forever"); }
1215                                         // Then, make sure any current forwards make their way to their destination
1216                                         if process_msg_events!(0, false, ProcessMessages::AllMessages) { continue; }
1217                                         if process_msg_events!(1, false, ProcessMessages::AllMessages) { continue; }
1218                                         if process_msg_events!(2, false, ProcessMessages::AllMessages) { continue; }
1219                                         // ...making sure any pending PendingHTLCsForwardable events are handled and
1220                                         // payments claimed.
1221                                         if process_events!(0, false) { continue; }
1222                                         if process_events!(1, false) { continue; }
1223                                         if process_events!(2, false) { continue; }
1224                                         break;
1225                                 }
1226
1227                                 // Finally, make sure that at least one end of each channel can make a substantial payment
1228                                 assert!(
1229                                         send_payment(&nodes[0], &nodes[1], chan_a, 10_000_000, &mut payment_id, &mut payment_idx) ||
1230                                         send_payment(&nodes[1], &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx));
1231                                 assert!(
1232                                         send_payment(&nodes[1], &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx) ||
1233                                         send_payment(&nodes[2], &nodes[1], chan_b, 10_000_000, &mut payment_id, &mut payment_idx));
1234
1235                                 last_htlc_clear_fee_a = fee_est_a.ret_val.load(atomic::Ordering::Acquire);
1236                                 last_htlc_clear_fee_b = fee_est_b.ret_val.load(atomic::Ordering::Acquire);
1237                                 last_htlc_clear_fee_c = fee_est_c.ret_val.load(atomic::Ordering::Acquire);
1238                         },
1239                         _ => test_return!(),
1240                 }
1241
1242                 node_a_ser.0.clear();
1243                 nodes[0].write(&mut node_a_ser).unwrap();
1244                 monitor_a.should_update_manager.store(false, atomic::Ordering::Relaxed);
1245                 node_b_ser.0.clear();
1246                 nodes[1].write(&mut node_b_ser).unwrap();
1247                 monitor_b.should_update_manager.store(false, atomic::Ordering::Relaxed);
1248                 node_c_ser.0.clear();
1249                 nodes[2].write(&mut node_c_ser).unwrap();
1250                 monitor_c.should_update_manager.store(false, atomic::Ordering::Relaxed);
1251         }
1252 }
1253
1254 /// We actually have different behavior based on if a certain log string has been seen, so we have
1255 /// to do a bit more tracking.
1256 #[derive(Clone)]
1257 struct SearchingOutput<O: Output> {
1258         output: O,
1259         may_fail: Arc<atomic::AtomicBool>,
1260 }
1261 impl<O: Output> Output for SearchingOutput<O> {
1262         fn locked_write(&self, data: &[u8]) {
1263                 // We hit a design limitation of LN state machine (see CONCURRENT_INBOUND_HTLC_FEE_BUFFER)
1264                 if std::str::from_utf8(data).unwrap().contains("Outbound update_fee HTLC buffer overflow - counterparty should force-close this channel") {
1265                         self.may_fail.store(true, atomic::Ordering::Release);
1266                 }
1267                 self.output.locked_write(data)
1268         }
1269 }
1270 impl<O: Output> SearchingOutput<O> {
1271         pub fn new(output: O) -> Self {
1272                 Self { output, may_fail: Arc::new(atomic::AtomicBool::new(false)) }
1273         }
1274 }
1275
1276 pub fn chanmon_consistency_test<Out: Output>(data: &[u8], out: Out) {
1277         do_test(data, out);
1278 }
1279
1280 #[no_mangle]
1281 pub extern "C" fn chanmon_consistency_run(data: *const u8, datalen: usize) {
1282         do_test(unsafe { std::slice::from_raw_parts(data, datalen) }, test_logger::DevNull{});
1283 }