_ 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::events;
  42 use lightning::events::MessageSendEventsProvider;
  43 use lightning::ln::{PaymentHash, PaymentPreimage, PaymentSecret};
  44 use lightning::ln::channelmanager::{ChainParameters, ChannelDetails, ChannelManager, PaymentSendFailure, ChannelManagerReadArgs, PaymentId, RecipientOnionFields};
  45 use lightning::ln::channel::FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE;
  46 use lightning::ln::msgs::{self, CommitmentUpdate, ChannelMessageHandler, DecodeError, UpdateAddHTLC, Init};
  47 use lightning::ln::script::ShutdownScript;
  48 use lightning::util::enforcing_trait_impls::{EnforcingSigner, EnforcementState};
  49 use lightning::util::errors::APIError;
  50 use lightning::util::logger::Logger;
  51 use lightning::util::config::UserConfig;
  52 use lightning::util::ser::{Readable, ReadableArgs, Writeable, Writer};
  53 use lightning::routing::router::{InFlightHtlcs, Path, 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 }
 101
 102 pub struct TestBroadcaster {}
 103 impl BroadcasterInterface for TestBroadcaster {
 104         fn broadcast_transaction(&self, _tx: &Transaction) { }
 105 }
 106
 107 pub struct VecWriter(pub Vec<u8>);
 108 impl Writer for VecWriter {
 109         fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
 110                 self.0.extend_from_slice(buf);
 111                 Ok(())
 112         }
 113 }
 114
 115 struct TestChainMonitor {
 116         pub logger: Arc<dyn Logger>,
 117         pub keys: Arc<KeyProvider>,
 118         pub persister: Arc<TestPersister>,
 119         pub chain_monitor: Arc<chainmonitor::ChainMonitor<EnforcingSigner, Arc<dyn chain::Filter>, Arc<TestBroadcaster>, Arc<FuzzEstimator>, Arc<dyn Logger>, Arc<TestPersister>>>,
 120         // If we reload a node with an old copy of ChannelMonitors, the ChannelManager deserialization
 121         // logic will automatically force-close our channels for us (as we don't have an up-to-date
 122         // monitor implying we are not able to punish misbehaving counterparties). Because this test
 123         // "fails" if we ever force-close a channel, we avoid doing so, always saving the latest
 124         // fully-serialized monitor state here, as well as the corresponding update_id.
 125         pub latest_monitors: Mutex<HashMap<OutPoint, (u64, Vec<u8>)>>,
 126         pub should_update_manager: atomic::AtomicBool,
 127 }
 128 impl TestChainMonitor {
 129         pub fn new(broadcaster: Arc<TestBroadcaster>, logger: Arc<dyn Logger>, feeest: Arc<FuzzEstimator>, persister: Arc<TestPersister>, keys: Arc<KeyProvider>) -> Self {
 130                 Self {
 131                         chain_monitor: Arc::new(chainmonitor::ChainMonitor::new(None, broadcaster, logger.clone(), feeest, Arc::clone(&persister))),
 132                         logger,
 133                         keys,
 134                         persister,
 135                         latest_monitors: Mutex::new(HashMap::new()),
 136                         should_update_manager: atomic::AtomicBool::new(false),
 137                 }
 138         }
 139 }
 140 impl chain::Watch<EnforcingSigner> for TestChainMonitor {
 141         fn watch_channel(&self, funding_txo: OutPoint, monitor: channelmonitor::ChannelMonitor<EnforcingSigner>) -> chain::ChannelMonitorUpdateStatus {
 142                 let mut ser = VecWriter(Vec::new());
 143                 monitor.write(&mut ser).unwrap();
 144                 if let Some(_) = self.latest_monitors.lock().unwrap().insert(funding_txo, (monitor.get_latest_update_id(), ser.0)) {
 145                         panic!("Already had monitor pre-watch_channel");
 146                 }
 147                 self.should_update_manager.store(true, atomic::Ordering::Relaxed);
 148                 self.chain_monitor.watch_channel(funding_txo, monitor)
 149         }
 150
 151         fn update_channel(&self, funding_txo: OutPoint, update: &channelmonitor::ChannelMonitorUpdate) -> chain::ChannelMonitorUpdateStatus {
 152                 let mut map_lock = self.latest_monitors.lock().unwrap();
 153                 let mut map_entry = match map_lock.entry(funding_txo) {
 154                         hash_map::Entry::Occupied(entry) => entry,
 155                         hash_map::Entry::Vacant(_) => panic!("Didn't have monitor on update call"),
 156                 };
 157                 let deserialized_monitor = <(BlockHash, channelmonitor::ChannelMonitor<EnforcingSigner>)>::
 158                         read(&mut Cursor::new(&map_entry.get().1), (&*self.keys, &*self.keys)).unwrap().1;
 159                 deserialized_monitor.update_monitor(update, &&TestBroadcaster{}, &FuzzEstimator { ret_val: atomic::AtomicU32::new(253) }, &self.logger).unwrap();
 160                 let mut ser = VecWriter(Vec::new());
 161                 deserialized_monitor.write(&mut ser).unwrap();
 162                 map_entry.insert((update.update_id, ser.0));
 163                 self.should_update_manager.store(true, atomic::Ordering::Relaxed);
 164                 self.chain_monitor.update_channel(funding_txo, update)
 165         }
 166
 167         fn release_pending_monitor_events(&self) -> Vec<(OutPoint, Vec<MonitorEvent>, Option<PublicKey>)> {
 168                 return self.chain_monitor.release_pending_monitor_events();
 169         }
 170 }
 171
 172 struct KeyProvider {
 173         node_secret: SecretKey,
 174         rand_bytes_id: atomic::AtomicU32,
 175         enforcement_states: Mutex<HashMap<[u8;32], Arc<Mutex<EnforcementState>>>>,
 176 }
 177
 178 impl EntropySource for KeyProvider {
 179         fn get_secure_random_bytes(&self) -> [u8; 32] {
 180                 let id = self.rand_bytes_id.fetch_add(1, atomic::Ordering::Relaxed);
 181                 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]];
 182                 res[30-4..30].copy_from_slice(&id.to_le_bytes());
 183                 res
 184         }
 185 }
 186
 187 impl NodeSigner for KeyProvider {
 188         fn get_node_id(&self, recipient: Recipient) -> Result<PublicKey, ()> {
 189                 let node_secret = match recipient {
 190                         Recipient::Node => Ok(&self.node_secret),
 191                         Recipient::PhantomNode => Err(())
 192                 }?;
 193                 Ok(PublicKey::from_secret_key(&Secp256k1::signing_only(), node_secret))
 194         }
 195
 196         fn ecdh(&self, recipient: Recipient, other_key: &PublicKey, tweak: Option<&Scalar>) -> Result<SharedSecret, ()> {
 197                 let mut node_secret = match recipient {
 198                         Recipient::Node => Ok(self.node_secret.clone()),
 199                         Recipient::PhantomNode => Err(())
 200                 }?;
 201                 if let Some(tweak) = tweak {
 202                         node_secret = node_secret.mul_tweak(tweak).map_err(|_| ())?;
 203                 }
 204                 Ok(SharedSecret::new(other_key, &node_secret))
 205         }
 206
 207         fn get_inbound_payment_key_material(&self) -> KeyMaterial {
 208                 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]])
 209         }
 210
 211         fn sign_invoice(&self, _hrp_bytes: &[u8], _invoice_data: &[u5], _recipient: Recipient) -> Result<RecoverableSignature, ()> {
 212                 unreachable!()
 213         }
 214
 215         fn sign_gossip_message(&self, msg: lightning::ln::msgs::UnsignedGossipMessage) -> Result<Signature, ()> {
 216                 let msg_hash = Message::from_slice(&Sha256dHash::hash(&msg.encode()[..])[..]).map_err(|_| ())?;
 217                 let secp_ctx = Secp256k1::signing_only();
 218                 Ok(secp_ctx.sign_ecdsa(&msg_hash, &self.node_secret))
 219         }
 220 }
 221
 222 impl SignerProvider for KeyProvider {
 223         type Signer = EnforcingSigner;
 224
 225         fn generate_channel_keys_id(&self, _inbound: bool, _channel_value_satoshis: u64, _user_channel_id: u128) -> [u8; 32] {
 226                 let id = self.rand_bytes_id.fetch_add(1, atomic::Ordering::Relaxed) as u8;
 227                 [id; 32]
 228         }
 229
 230         fn derive_channel_signer(&self, channel_value_satoshis: u64, channel_keys_id: [u8; 32]) -> Self::Signer {
 231                 let secp_ctx = Secp256k1::signing_only();
 232                 let id = channel_keys_id[0];
 233                 let keys = InMemorySigner::new(
 234                         &secp_ctx,
 235                         SecretKey::from_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, self.node_secret[31]]).unwrap(),
 236                         SecretKey::from_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, self.node_secret[31]]).unwrap(),
 237                         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(),
 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, 7, 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, 8, self.node_secret[31]]).unwrap(),
 240                         [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]],
 241                         channel_value_satoshis,
 242                         channel_keys_id,
 243                 );
 244                 let revoked_commitment = self.make_enforcement_state_cell(keys.commitment_seed);
 245                 EnforcingSigner::new_with_revoked(keys, revoked_commitment, false)
 246         }
 247
 248         fn read_chan_signer(&self, buffer: &[u8]) -> Result<Self::Signer, DecodeError> {
 249                 let mut reader = std::io::Cursor::new(buffer);
 250
 251                 let inner: InMemorySigner = Readable::read(&mut reader)?;
 252                 let state = self.make_enforcement_state_cell(inner.commitment_seed);
 253
 254                 Ok(EnforcingSigner {
 255                         inner,
 256                         state,
 257                         disable_revocation_policy_check: false,
 258                 })
 259         }
 260
 261         fn get_destination_script(&self) -> Script {
 262                 let secp_ctx = Secp256k1::signing_only();
 263                 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();
 264                 let our_channel_monitor_claim_key_hash = WPubkeyHash::hash(&PublicKey::from_secret_key(&secp_ctx, &channel_monitor_claim_key).serialize());
 265                 Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0).push_slice(&our_channel_monitor_claim_key_hash[..]).into_script()
 266         }
 267
 268         fn get_shutdown_scriptpubkey(&self) -> ShutdownScript {
 269                 let secp_ctx = Secp256k1::signing_only();
 270                 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();
 271                 let pubkey_hash = WPubkeyHash::hash(&PublicKey::from_secret_key(&secp_ctx, &secret_key).serialize());
 272                 ShutdownScript::new_p2wpkh(&pubkey_hash)
 273         }
 274 }
 275
 276 impl KeyProvider {
 277         fn make_enforcement_state_cell(&self, commitment_seed: [u8; 32]) -> Arc<Mutex<EnforcementState>> {
 278                 let mut revoked_commitments = self.enforcement_states.lock().unwrap();
 279                 if !revoked_commitments.contains_key(&commitment_seed) {
 280                         revoked_commitments.insert(commitment_seed, Arc::new(Mutex::new(EnforcementState::new())));
 281                 }
 282                 let cell = revoked_commitments.get(&commitment_seed).unwrap();
 283                 Arc::clone(cell)
 284         }
 285 }
 286
 287 #[inline]
 288 fn check_api_err(api_err: APIError) {
 289         match api_err {
 290                 APIError::APIMisuseError { .. } => panic!("We can't misuse the API"),
 291                 APIError::FeeRateTooHigh { .. } => panic!("We can't send too much fee?"),
 292                 APIError::InvalidRoute { .. } => panic!("Our routes should work"),
 293                 APIError::ChannelUnavailable { err } => {
 294                         // Test the error against a list of errors we can hit, and reject
 295                         // all others. If you hit this panic, the list of acceptable errors
 296                         // is probably just stale and you should add new messages here.
 297                         match err.as_str() {
 298                                 "Peer for first hop currently disconnected" => {},
 299                                 _ if err.starts_with("Cannot push more than their max accepted HTLCs ") => {},
 300                                 _ if err.starts_with("Cannot send value that would put us over the max HTLC value in flight our peer will accept ") => {},
 301                                 _ if err.starts_with("Cannot send value that would put our balance under counterparty-announced channel reserve value") => {},
 302                                 _ if err.starts_with("Cannot send value that would put counterparty balance under holder-announced channel reserve value") => {},
 303                                 _ if err.starts_with("Cannot send value that would overdraw remaining funds.") => {},
 304                                 _ if err.starts_with("Cannot send value that would not leave enough to pay for fees.") => {},
 305                                 _ if err.starts_with("Cannot send value that would put our exposure to dust HTLCs at") => {},
 306                                 _ => panic!("{}", err),
 307                         }
 308                 },
 309                 APIError::MonitorUpdateInProgress => {
 310                         // We can (obviously) temp-fail a monitor update
 311                 },
 312                 APIError::IncompatibleShutdownScript { .. } => panic!("Cannot send an incompatible shutdown script"),
 313         }
 314 }
 315 #[inline]
 316 fn check_payment_err(send_err: PaymentSendFailure) {
 317         match send_err {
 318                 PaymentSendFailure::ParameterError(api_err) => check_api_err(api_err),
 319                 PaymentSendFailure::PathParameterError(per_path_results) => {
 320                         for res in per_path_results { if let Err(api_err) = res { check_api_err(api_err); } }
 321                 },
 322                 PaymentSendFailure::AllFailedResendSafe(per_path_results) => {
 323                         for api_err in per_path_results { check_api_err(api_err); }
 324                 },
 325                 PaymentSendFailure::PartialFailure { results, .. } => {
 326                         for res in results { if let Err(api_err) = res { check_api_err(api_err); } }
 327                 },
 328                 PaymentSendFailure::DuplicatePayment => panic!(),
 329         }
 330 }
 331
 332 type ChanMan<'a> = ChannelManager<Arc<TestChainMonitor>, Arc<TestBroadcaster>, Arc<KeyProvider>, Arc<KeyProvider>, Arc<KeyProvider>, Arc<FuzzEstimator>, &'a FuzzRouter, Arc<dyn Logger>>;
 333
 334 #[inline]
 335 fn get_payment_secret_hash(dest: &ChanMan, payment_id: &mut u8) -> Option<(PaymentSecret, PaymentHash)> {
 336         let mut payment_hash;
 337         for _ in 0..256 {
 338                 payment_hash = PaymentHash(Sha256::hash(&[*payment_id; 1]).into_inner());
 339                 if let Ok(payment_secret) = dest.create_inbound_payment_for_hash(payment_hash, None, 3600, None) {
 340                         return Some((payment_secret, payment_hash));
 341                 }
 342                 *payment_id = payment_id.wrapping_add(1);
 343         }
 344         None
 345 }
 346
 347 #[inline]
 348 fn send_payment(source: &ChanMan, dest: &ChanMan, dest_chan_id: u64, amt: u64, payment_id: &mut u8, payment_idx: &mut u64) -> bool {
 349         let (payment_secret, payment_hash) =
 350                 if let Some((secret, hash)) = get_payment_secret_hash(dest, payment_id) { (secret, hash) } else { return true; };
 351         let mut payment_id = [0; 32];
 352         payment_id[0..8].copy_from_slice(&payment_idx.to_ne_bytes());
 353         *payment_idx += 1;
 354         if let Err(err) = source.send_payment_with_route(&Route {
 355                 paths: vec![Path { hops: vec![RouteHop {
 356                         pubkey: dest.get_our_node_id(),
 357                         node_features: dest.node_features(),
 358                         short_channel_id: dest_chan_id,
 359                         channel_features: dest.channel_features(),
 360                         fee_msat: amt,
 361                         cltv_expiry_delta: 200,
 362                 }], blinded_tail: None }],
 363                 payment_params: None,
 364         }, payment_hash, RecipientOnionFields::secret_only(payment_secret), PaymentId(payment_id)) {
 365                 check_payment_err(err);
 366                 false
 367         } else { true }
 368 }
 369 #[inline]
 370 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 {
 371         let (payment_secret, payment_hash) =
 372                 if let Some((secret, hash)) = get_payment_secret_hash(dest, payment_id) { (secret, hash) } else { return true; };
 373         let mut payment_id = [0; 32];
 374         payment_id[0..8].copy_from_slice(&payment_idx.to_ne_bytes());
 375         *payment_idx += 1;
 376         if let Err(err) = source.send_payment_with_route(&Route {
 377                 paths: vec![Path { hops: vec![RouteHop {
 378                         pubkey: middle.get_our_node_id(),
 379                         node_features: middle.node_features(),
 380                         short_channel_id: middle_chan_id,
 381                         channel_features: middle.channel_features(),
 382                         fee_msat: 50000,
 383                         cltv_expiry_delta: 100,
 384                 },RouteHop {
 385                         pubkey: dest.get_our_node_id(),
 386                         node_features: dest.node_features(),
 387                         short_channel_id: dest_chan_id,
 388                         channel_features: dest.channel_features(),
 389                         fee_msat: amt,
 390                         cltv_expiry_delta: 200,
 391                 }], blinded_tail: None }],
 392                 payment_params: None,
 393         }, payment_hash, RecipientOnionFields::secret_only(payment_secret), PaymentId(payment_id)) {
 394                 check_payment_err(err);
 395                 false
 396         } else { true }
 397 }
 398
 399 #[inline]
 400 pub fn do_test<Out: Output>(data: &[u8], underlying_out: Out) {
 401         let out = SearchingOutput::new(underlying_out);
 402         let broadcast = Arc::new(TestBroadcaster{});
 403         let router = FuzzRouter {};
 404
 405         macro_rules! make_node {
 406                 ($node_id: expr, $fee_estimator: expr) => { {
 407                         let logger: Arc<dyn Logger> = Arc::new(test_logger::TestLogger::new($node_id.to_string(), out.clone()));
 408                         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();
 409                         let keys_manager = Arc::new(KeyProvider { node_secret, rand_bytes_id: atomic::AtomicU32::new(0), enforcement_states: Mutex::new(HashMap::new()) });
 410                         let monitor = Arc::new(TestChainMonitor::new(broadcast.clone(), logger.clone(), $fee_estimator.clone(),
 411                                 Arc::new(TestPersister {
 412                                         update_ret: Mutex::new(ChannelMonitorUpdateStatus::Completed)
 413                                 }), Arc::clone(&keys_manager)));
 414
 415                         let mut config = UserConfig::default();
 416                         config.channel_config.forwarding_fee_proportional_millionths = 0;
 417                         config.channel_handshake_config.announced_channel = true;
 418                         let network = Network::Bitcoin;
 419                         let params = ChainParameters {
 420                                 network,
 421                                 best_block: BestBlock::from_network(network),
 422                         };
 423                         (ChannelManager::new($fee_estimator.clone(), monitor.clone(), broadcast.clone(), &router, Arc::clone(&logger), keys_manager.clone(), keys_manager.clone(), keys_manager.clone(), config, params),
 424                         monitor, keys_manager)
 425                 } }
 426         }
 427
 428         macro_rules! reload_node {
 429                 ($ser: expr, $node_id: expr, $old_monitors: expr, $keys_manager: expr, $fee_estimator: expr) => { {
 430                     let keys_manager = Arc::clone(& $keys_manager);
 431                         let logger: Arc<dyn Logger> = Arc::new(test_logger::TestLogger::new($node_id.to_string(), out.clone()));
 432                         let chain_monitor = Arc::new(TestChainMonitor::new(broadcast.clone(), logger.clone(), $fee_estimator.clone(),
 433                                 Arc::new(TestPersister {
 434                                         update_ret: Mutex::new(ChannelMonitorUpdateStatus::Completed)
 435                                 }), Arc::clone(& $keys_manager)));
 436
 437                         let mut config = UserConfig::default();
 438                         config.channel_config.forwarding_fee_proportional_millionths = 0;
 439                         config.channel_handshake_config.announced_channel = true;
 440
 441                         let mut monitors = HashMap::new();
 442                         let mut old_monitors = $old_monitors.latest_monitors.lock().unwrap();
 443                         for (outpoint, (update_id, monitor_ser)) in old_monitors.drain() {
 444                                 monitors.insert(outpoint, <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(&mut Cursor::new(&monitor_ser), (&*$keys_manager, &*$keys_manager)).expect("Failed to read monitor").1);
 445                                 chain_monitor.latest_monitors.lock().unwrap().insert(outpoint, (update_id, monitor_ser));
 446                         }
 447                         let mut monitor_refs = HashMap::new();
 448                         for (outpoint, monitor) in monitors.iter_mut() {
 449                                 monitor_refs.insert(*outpoint, monitor);
 450                         }
 451
 452                         let read_args = ChannelManagerReadArgs {
 453                                 entropy_source: keys_manager.clone(),
 454                                 node_signer: keys_manager.clone(),
 455                                 signer_provider: keys_manager.clone(),
 456                                 fee_estimator: $fee_estimator.clone(),
 457                                 chain_monitor: chain_monitor.clone(),
 458                                 tx_broadcaster: broadcast.clone(),
 459                                 router: &router,
 460                                 logger,
 461                                 default_config: config,
 462                                 channel_monitors: monitor_refs,
 463                         };
 464
 465                         let res = (<(BlockHash, ChanMan)>::read(&mut Cursor::new(&$ser.0), read_args).expect("Failed to read manager").1, chain_monitor.clone());
 466                         for (funding_txo, mon) in monitors.drain() {
 467                                 assert_eq!(chain_monitor.chain_monitor.watch_channel(funding_txo, mon),
 468                                         ChannelMonitorUpdateStatus::Completed);
 469                         }
 470                         res
 471                 } }
 472         }
 473
 474         let mut channel_txn = Vec::new();
 475         macro_rules! make_channel {
 476                 ($source: expr, $dest: expr, $chan_id: expr) => { {
 477                         $source.peer_connected(&$dest.get_our_node_id(), &Init { features: $dest.init_features(), remote_network_address: None }, true).unwrap();
 478                         $dest.peer_connected(&$source.get_our_node_id(), &Init { features: $source.init_features(), remote_network_address: None }, false).unwrap();
 479
 480                         $source.create_channel($dest.get_our_node_id(), 100_000, 42, 0, None).unwrap();
 481                         let open_channel = {
 482                                 let events = $source.get_and_clear_pending_msg_events();
 483                                 assert_eq!(events.len(), 1);
 484                                 if let events::MessageSendEvent::SendOpenChannel { ref msg, .. } = events[0] {
 485                                         msg.clone()
 486                                 } else { panic!("Wrong event type"); }
 487                         };
 488
 489                         $dest.handle_open_channel(&$source.get_our_node_id(), &open_channel);
 490                         let accept_channel = {
 491                                 let events = $dest.get_and_clear_pending_msg_events();
 492                                 assert_eq!(events.len(), 1);
 493                                 if let events::MessageSendEvent::SendAcceptChannel { ref msg, .. } = events[0] {
 494                                         msg.clone()
 495                                 } else { panic!("Wrong event type"); }
 496                         };
 497
 498                         $source.handle_accept_channel(&$dest.get_our_node_id(), &accept_channel);
 499                         let funding_output;
 500                         {
 501                                 let events = $source.get_and_clear_pending_events();
 502                                 assert_eq!(events.len(), 1);
 503                                 if let events::Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, .. } = events[0] {
 504                                         let tx = Transaction { version: $chan_id, lock_time: PackedLockTime::ZERO, input: Vec::new(), output: vec![TxOut {
 505                                                 value: *channel_value_satoshis, script_pubkey: output_script.clone(),
 506                                         }]};
 507                                         funding_output = OutPoint { txid: tx.txid(), index: 0 };
 508                                         $source.funding_transaction_generated(&temporary_channel_id, &$dest.get_our_node_id(), tx.clone()).unwrap();
 509                                         channel_txn.push(tx);
 510                                 } else { panic!("Wrong event type"); }
 511                         }
 512
 513                         let funding_created = {
 514                                 let events = $source.get_and_clear_pending_msg_events();
 515                                 assert_eq!(events.len(), 1);
 516                                 if let events::MessageSendEvent::SendFundingCreated { ref msg, .. } = events[0] {
 517                                         msg.clone()
 518                                 } else { panic!("Wrong event type"); }
 519                         };
 520                         $dest.handle_funding_created(&$source.get_our_node_id(), &funding_created);
 521
 522                         let funding_signed = {
 523                                 let events = $dest.get_and_clear_pending_msg_events();
 524                                 assert_eq!(events.len(), 1);
 525                                 if let events::MessageSendEvent::SendFundingSigned { ref msg, .. } = events[0] {
 526                                         msg.clone()
 527                                 } else { panic!("Wrong event type"); }
 528                         };
 529                         let events = $dest.get_and_clear_pending_events();
 530                         assert_eq!(events.len(), 1);
 531                         if let events::Event::ChannelPending{ ref counterparty_node_id, .. } = events[0] {
 532                                 assert_eq!(counterparty_node_id, &$source.get_our_node_id());
 533                         } else { panic!("Wrong event type"); }
 534
 535                         $source.handle_funding_signed(&$dest.get_our_node_id(), &funding_signed);
 536                         let events = $source.get_and_clear_pending_events();
 537                         assert_eq!(events.len(), 1);
 538                         if let events::Event::ChannelPending{ ref counterparty_node_id, .. } = events[0] {
 539                                 assert_eq!(counterparty_node_id, &$dest.get_our_node_id());
 540                         } else { panic!("Wrong event type"); }
 541
 542                         funding_output
 543                 } }
 544         }
 545
 546         macro_rules! confirm_txn {
 547                 ($node: expr) => { {
 548                         let chain_hash = genesis_block(Network::Bitcoin).block_hash();
 549                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: chain_hash, merkle_root: TxMerkleNode::all_zeros(), time: 42, bits: 42, nonce: 42 };
 550                         let txdata: Vec<_> = channel_txn.iter().enumerate().map(|(i, tx)| (i + 1, tx)).collect();
 551                         $node.transactions_confirmed(&header, &txdata, 1);
 552                         for _ in 2..100 {
 553                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.block_hash(), merkle_root: TxMerkleNode::all_zeros(), time: 42, bits: 42, nonce: 42 };
 554                         }
 555                         $node.best_block_updated(&header, 99);
 556                 } }
 557         }
 558
 559         macro_rules! lock_fundings {
 560                 ($nodes: expr) => { {
 561                         let mut node_events = Vec::new();
 562                         for node in $nodes.iter() {
 563                                 node_events.push(node.get_and_clear_pending_msg_events());
 564                         }
 565                         for (idx, node_event) in node_events.iter().enumerate() {
 566                                 for event in node_event {
 567                                         if let events::MessageSendEvent::SendChannelReady { ref node_id, ref msg } = event {
 568                                                 for node in $nodes.iter() {
 569                                                         if node.get_our_node_id() == *node_id {
 570                                                                 node.handle_channel_ready(&$nodes[idx].get_our_node_id(), msg);
 571                                                         }
 572                                                 }
 573                                         } else { panic!("Wrong event type"); }
 574                                 }
 575                         }
 576
 577                         for node in $nodes.iter() {
 578                                 let events = node.get_and_clear_pending_msg_events();
 579                                 for event in events {
 580                                         if let events::MessageSendEvent::SendAnnouncementSignatures { .. } = event {
 581                                         } else { panic!("Wrong event type"); }
 582                                 }
 583                         }
 584                 } }
 585         }
 586
 587         let fee_est_a = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 588         let mut last_htlc_clear_fee_a =  253;
 589         let fee_est_b = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 590         let mut last_htlc_clear_fee_b =  253;
 591         let fee_est_c = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 592         let mut last_htlc_clear_fee_c =  253;
 593
 594         // 3 nodes is enough to hit all the possible cases, notably unknown-source-unknown-dest
 595         // forwarding.
 596         let (node_a, mut monitor_a, keys_manager_a) = make_node!(0, fee_est_a);
 597         let (node_b, mut monitor_b, keys_manager_b) = make_node!(1, fee_est_b);
 598         let (node_c, mut monitor_c, keys_manager_c) = make_node!(2, fee_est_c);
 599
 600         let mut nodes = [node_a, node_b, node_c];
 601
 602         let chan_1_funding = make_channel!(nodes[0], nodes[1], 0);
 603         let chan_2_funding = make_channel!(nodes[1], nodes[2], 1);
 604
 605         for node in nodes.iter() {
 606                 confirm_txn!(node);
 607         }
 608
 609         lock_fundings!(nodes);
 610
 611         let chan_a = nodes[0].list_usable_channels()[0].short_channel_id.unwrap();
 612         let chan_b = nodes[2].list_usable_channels()[0].short_channel_id.unwrap();
 613
 614         let mut payment_id: u8 = 0;
 615         let mut payment_idx: u64 = 0;
 616
 617         let mut chan_a_disconnected = false;
 618         let mut chan_b_disconnected = false;
 619         let mut ab_events = Vec::new();
 620         let mut ba_events = Vec::new();
 621         let mut bc_events = Vec::new();
 622         let mut cb_events = Vec::new();
 623
 624         let mut node_a_ser = VecWriter(Vec::new());
 625         nodes[0].write(&mut node_a_ser).unwrap();
 626         let mut node_b_ser = VecWriter(Vec::new());
 627         nodes[1].write(&mut node_b_ser).unwrap();
 628         let mut node_c_ser = VecWriter(Vec::new());
 629         nodes[2].write(&mut node_c_ser).unwrap();
 630
 631         macro_rules! test_return {
 632                 () => { {
 633                         assert_eq!(nodes[0].list_channels().len(), 1);
 634                         assert_eq!(nodes[1].list_channels().len(), 2);
 635                         assert_eq!(nodes[2].list_channels().len(), 1);
 636                         return;
 637                 } }
 638         }
 639
 640         let mut read_pos = 0;
 641         macro_rules! get_slice {
 642                 ($len: expr) => {
 643                         {
 644                                 let slice_len = $len as usize;
 645                                 if data.len() < read_pos + slice_len {
 646                                         test_return!();
 647                                 }
 648                                 read_pos += slice_len;
 649                                 &data[read_pos - slice_len..read_pos]
 650                         }
 651                 }
 652         }
 653
 654         loop {
 655                 // Push any events from Node B onto ba_events and bc_events
 656                 macro_rules! push_excess_b_events {
 657                         ($excess_events: expr, $expect_drop_node: expr) => { {
 658                                 let a_id = nodes[0].get_our_node_id();
 659                                 let expect_drop_node: Option<usize> = $expect_drop_node;
 660                                 let expect_drop_id = if let Some(id) = expect_drop_node { Some(nodes[id].get_our_node_id()) } else { None };
 661                                 for event in $excess_events {
 662                                         let push_a = match event {
 663                                                 events::MessageSendEvent::UpdateHTLCs { 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::SendRevokeAndACK { ref node_id, .. } => {
 668                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 669                                                         *node_id == a_id
 670                                                 },
 671                                                 events::MessageSendEvent::SendChannelReestablish { ref node_id, .. } => {
 672                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 673                                                         *node_id == a_id
 674                                                 },
 675                                                 events::MessageSendEvent::SendChannelReady { .. } => continue,
 676                                                 events::MessageSendEvent::SendAnnouncementSignatures { .. } => continue,
 677                                                 events::MessageSendEvent::SendChannelUpdate { ref node_id, ref msg } => {
 678                                                         assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 679                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 680                                                         *node_id == a_id
 681                                                 },
 682                                                 _ => panic!("Unhandled message event {:?}", event),
 683                                         };
 684                                         if push_a { ba_events.push(event); } else { bc_events.push(event); }
 685                                 }
 686                         } }
 687                 }
 688
 689                 // While delivering messages, we select across three possible message selection processes
 690                 // to ensure we get as much coverage as possible. See the individual enum variants for more
 691                 // details.
 692                 #[derive(PartialEq)]
 693                 enum ProcessMessages {
 694                         /// Deliver all available messages, including fetching any new messages from
 695                         /// `get_and_clear_pending_msg_events()` (which may have side effects).
 696                         AllMessages,
 697                         /// Call `get_and_clear_pending_msg_events()` first, and then deliver up to one
 698                         /// message (which may already be queued).
 699                         OneMessage,
 700                         /// Deliver up to one already-queued message. This avoids any potential side-effects
 701                         /// of `get_and_clear_pending_msg_events()` (eg freeing the HTLC holding cell), which
 702                         /// provides potentially more coverage.
 703                         OnePendingMessage,
 704                 }
 705
 706                 macro_rules! process_msg_events {
 707                         ($node: expr, $corrupt_forward: expr, $limit_events: expr) => { {
 708                                 let mut events = if $node == 1 {
 709                                         let mut new_events = Vec::new();
 710                                         mem::swap(&mut new_events, &mut ba_events);
 711                                         new_events.extend_from_slice(&bc_events[..]);
 712                                         bc_events.clear();
 713                                         new_events
 714                                 } else if $node == 0 {
 715                                         let mut new_events = Vec::new();
 716                                         mem::swap(&mut new_events, &mut ab_events);
 717                                         new_events
 718                                 } else {
 719                                         let mut new_events = Vec::new();
 720                                         mem::swap(&mut new_events, &mut cb_events);
 721                                         new_events
 722                                 };
 723                                 let mut new_events = Vec::new();
 724                                 if $limit_events != ProcessMessages::OnePendingMessage {
 725                                         new_events = nodes[$node].get_and_clear_pending_msg_events();
 726                                 }
 727                                 let mut had_events = false;
 728                                 let mut events_iter = events.drain(..).chain(new_events.drain(..));
 729                                 let mut extra_ev = None;
 730                                 for event in &mut events_iter {
 731                                         had_events = true;
 732                                         match event {
 733                                                 events::MessageSendEvent::UpdateHTLCs { node_id, updates: CommitmentUpdate { update_add_htlcs, update_fail_htlcs, update_fulfill_htlcs, update_fail_malformed_htlcs, update_fee, commitment_signed } } => {
 734                                                         for (idx, dest) in nodes.iter().enumerate() {
 735                                                                 if dest.get_our_node_id() == node_id {
 736                                                                         for update_add in update_add_htlcs.iter() {
 737                                                                                 out.locked_write(format!("Delivering update_add_htlc to node {}.\n", idx).as_bytes());
 738                                                                                 if !$corrupt_forward {
 739                                                                                         dest.handle_update_add_htlc(&nodes[$node].get_our_node_id(), update_add);
 740                                                                                 } else {
 741                                                                                         // Corrupt the update_add_htlc message so that its HMAC
 742                                                                                         // check will fail and we generate a
 743                                                                                         // update_fail_malformed_htlc instead of an
 744                                                                                         // update_fail_htlc as we do when we reject a payment.
 745                                                                                         let mut msg_ser = update_add.encode();
 746                                                                                         msg_ser[1000] ^= 0xff;
 747                                                                                         let new_msg = UpdateAddHTLC::read(&mut Cursor::new(&msg_ser)).unwrap();
 748                                                                                         dest.handle_update_add_htlc(&nodes[$node].get_our_node_id(), &new_msg);
 749                                                                                 }
 750                                                                         }
 751                                                                         for update_fulfill in update_fulfill_htlcs.iter() {
 752                                                                                 out.locked_write(format!("Delivering update_fulfill_htlc to node {}.\n", idx).as_bytes());
 753                                                                                 dest.handle_update_fulfill_htlc(&nodes[$node].get_our_node_id(), update_fulfill);
 754                                                                         }
 755                                                                         for update_fail in update_fail_htlcs.iter() {
 756                                                                                 out.locked_write(format!("Delivering update_fail_htlc to node {}.\n", idx).as_bytes());
 757                                                                                 dest.handle_update_fail_htlc(&nodes[$node].get_our_node_id(), update_fail);
 758                                                                         }
 759                                                                         for update_fail_malformed in update_fail_malformed_htlcs.iter() {
 760                                                                                 out.locked_write(format!("Delivering update_fail_malformed_htlc to node {}.\n", idx).as_bytes());
 761                                                                                 dest.handle_update_fail_malformed_htlc(&nodes[$node].get_our_node_id(), update_fail_malformed);
 762                                                                         }
 763                                                                         if let Some(msg) = update_fee {
 764                                                                                 out.locked_write(format!("Delivering update_fee to node {}.\n", idx).as_bytes());
 765                                                                                 dest.handle_update_fee(&nodes[$node].get_our_node_id(), &msg);
 766                                                                         }
 767                                                                         let processed_change = !update_add_htlcs.is_empty() || !update_fulfill_htlcs.is_empty() ||
 768                                                                                 !update_fail_htlcs.is_empty() || !update_fail_malformed_htlcs.is_empty();
 769                                                                         if $limit_events != ProcessMessages::AllMessages && processed_change {
 770                                                                                 // If we only want to process some messages, don't deliver the CS until later.
 771                                                                                 extra_ev = Some(events::MessageSendEvent::UpdateHTLCs { node_id, updates: CommitmentUpdate {
 772                                                                                         update_add_htlcs: Vec::new(),
 773                                                                                         update_fail_htlcs: Vec::new(),
 774                                                                                         update_fulfill_htlcs: Vec::new(),
 775                                                                                         update_fail_malformed_htlcs: Vec::new(),
 776                                                                                         update_fee: None,
 777                                                                                         commitment_signed
 778                                                                                 } });
 779                                                                                 break;
 780                                                                         }
 781                                                                         out.locked_write(format!("Delivering commitment_signed to node {}.\n", idx).as_bytes());
 782                                                                         dest.handle_commitment_signed(&nodes[$node].get_our_node_id(), &commitment_signed);
 783                                                                         break;
 784                                                                 }
 785                                                         }
 786                                                 },
 787                                                 events::MessageSendEvent::SendRevokeAndACK { 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 revoke_and_ack to node {}.\n", idx).as_bytes());
 791                                                                         dest.handle_revoke_and_ack(&nodes[$node].get_our_node_id(), msg);
 792                                                                 }
 793                                                         }
 794                                                 },
 795                                                 events::MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
 796                                                         for (idx, dest) in nodes.iter().enumerate() {
 797                                                                 if dest.get_our_node_id() == *node_id {
 798                                                                         out.locked_write(format!("Delivering channel_reestablish to node {}.\n", idx).as_bytes());
 799                                                                         dest.handle_channel_reestablish(&nodes[$node].get_our_node_id(), msg);
 800                                                                 }
 801                                                         }
 802                                                 },
 803                                                 events::MessageSendEvent::SendChannelReady { .. } => {
 804                                                         // Can be generated as a reestablish response
 805                                                 },
 806                                                 events::MessageSendEvent::SendAnnouncementSignatures { .. } => {
 807                                                         // Can be generated as a reestablish response
 808                                                 },
 809                                                 events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 810                                                         // When we reconnect we will resend a channel_update to make sure our
 811                                                         // counterparty has the latest parameters for receiving payments
 812                                                         // through us. We do, however, check that the message does not include
 813                                                         // the "disabled" bit, as we should never ever have a channel which is
 814                                                         // disabled when we send such an update (or it may indicate channel
 815                                                         // force-close which we should detect as an error).
 816                                                         assert_eq!(msg.contents.flags & 2, 0);
 817                                                 },
 818                                                 _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 819                                                         return;
 820                                                 } else {
 821                                                         panic!("Unhandled message event {:?}", event)
 822                                                 },
 823                                         }
 824                                         if $limit_events != ProcessMessages::AllMessages {
 825                                                 break;
 826                                         }
 827                                 }
 828                                 if $node == 1 {
 829                                         push_excess_b_events!(extra_ev.into_iter().chain(events_iter), None);
 830                                 } else if $node == 0 {
 831                                         if let Some(ev) = extra_ev { ab_events.push(ev); }
 832                                         for event in events_iter { ab_events.push(event); }
 833                                 } else {
 834                                         if let Some(ev) = extra_ev { cb_events.push(ev); }
 835                                         for event in events_iter { cb_events.push(event); }
 836                                 }
 837                                 had_events
 838                         } }
 839                 }
 840
 841                 macro_rules! drain_msg_events_on_disconnect {
 842                         ($counterparty_id: expr) => { {
 843                                 if $counterparty_id == 0 {
 844                                         for event in nodes[0].get_and_clear_pending_msg_events() {
 845                                                 match event {
 846                                                         events::MessageSendEvent::UpdateHTLCs { .. } => {},
 847                                                         events::MessageSendEvent::SendRevokeAndACK { .. } => {},
 848                                                         events::MessageSendEvent::SendChannelReestablish { .. } => {},
 849                                                         events::MessageSendEvent::SendChannelReady { .. } => {},
 850                                                         events::MessageSendEvent::SendAnnouncementSignatures { .. } => {},
 851                                                         events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 852                                                                 assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 853                                                         },
 854                                                         _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 855                                                                 return;
 856                                                         } else {
 857                                                                 panic!("Unhandled message event")
 858                                                         },
 859                                                 }
 860                                         }
 861                                         push_excess_b_events!(nodes[1].get_and_clear_pending_msg_events().drain(..), Some(0));
 862                                         ab_events.clear();
 863                                         ba_events.clear();
 864                                 } else {
 865                                         for event in nodes[2].get_and_clear_pending_msg_events() {
 866                                                 match event {
 867                                                         events::MessageSendEvent::UpdateHTLCs { .. } => {},
 868                                                         events::MessageSendEvent::SendRevokeAndACK { .. } => {},
 869                                                         events::MessageSendEvent::SendChannelReestablish { .. } => {},
 870                                                         events::MessageSendEvent::SendChannelReady { .. } => {},
 871                                                         events::MessageSendEvent::SendAnnouncementSignatures { .. } => {},
 872                                                         events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 873                                                                 assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 874                                                         },
 875                                                         _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 876                                                                 return;
 877                                                         } else {
 878                                                                 panic!("Unhandled message event")
 879                                                         },
 880                                                 }
 881                                         }
 882                                         push_excess_b_events!(nodes[1].get_and_clear_pending_msg_events().drain(..), Some(2));
 883                                         bc_events.clear();
 884                                         cb_events.clear();
 885                                 }
 886                         } }
 887                 }
 888
 889                 macro_rules! process_events {
 890                         ($node: expr, $fail: expr) => { {
 891                                 // In case we get 256 payments we may have a hash collision, resulting in the
 892                                 // second claim/fail call not finding the duplicate-hash HTLC, so we have to
 893                                 // deduplicate the calls here.
 894                                 let mut claim_set = HashSet::new();
 895                                 let mut events = nodes[$node].get_and_clear_pending_events();
 896                                 // Sort events so that PendingHTLCsForwardable get processed last. This avoids a
 897                                 // case where we first process a PendingHTLCsForwardable, then claim/fail on a
 898                                 // PaymentClaimable, claiming/failing two HTLCs, but leaving a just-generated
 899                                 // PaymentClaimable event for the second HTLC in our pending_events (and breaking
 900                                 // our claim_set deduplication).
 901                                 events.sort_by(|a, b| {
 902                                         if let events::Event::PaymentClaimable { .. } = a {
 903                                                 if let events::Event::PendingHTLCsForwardable { .. } = b {
 904                                                         Ordering::Less
 905                                                 } else { Ordering::Equal }
 906                                         } else if let events::Event::PendingHTLCsForwardable { .. } = a {
 907                                                 if let events::Event::PaymentClaimable { .. } = b {
 908                                                         Ordering::Greater
 909                                                 } else { Ordering::Equal }
 910                                         } else { Ordering::Equal }
 911                                 });
 912                                 let had_events = !events.is_empty();
 913                                 for event in events.drain(..) {
 914                                         match event {
 915                                                 events::Event::PaymentClaimable { payment_hash, .. } => {
 916                                                         if claim_set.insert(payment_hash.0) {
 917                                                                 if $fail {
 918                                                                         nodes[$node].fail_htlc_backwards(&payment_hash);
 919                                                                 } else {
 920                                                                         nodes[$node].claim_funds(PaymentPreimage(payment_hash.0));
 921                                                                 }
 922                                                         }
 923                                                 },
 924                                                 events::Event::PaymentSent { .. } => {},
 925                                                 events::Event::PaymentClaimed { .. } => {},
 926                                                 events::Event::PaymentPathSuccessful { .. } => {},
 927                                                 events::Event::PaymentPathFailed { .. } => {},
 928                                                 events::Event::PaymentFailed { .. } => {},
 929                                                 events::Event::ProbeSuccessful { .. } | events::Event::ProbeFailed { .. } => {
 930                                                         // Even though we don't explicitly send probes, because probes are
 931                                                         // detected based on hashing the payment hash+preimage, its rather
 932                                                         // trivial for the fuzzer to build payments that accidentally end up
 933                                                         // looking like probes.
 934                                                 },
 935                                                 events::Event::PaymentForwarded { .. } if $node == 1 => {},
 936                                                 events::Event::ChannelReady { .. } => {},
 937                                                 events::Event::PendingHTLCsForwardable { .. } => {
 938                                                         nodes[$node].process_pending_htlc_forwards();
 939                                                 },
 940                                                 events::Event::HTLCHandlingFailed { .. } => {},
 941                                                 _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 942                                                         return;
 943                                                 } else {
 944                                                         panic!("Unhandled event")
 945                                                 },
 946                                         }
 947                                 }
 948                                 had_events
 949                         } }
 950                 }
 951
 952                 let v = get_slice!(1)[0];
 953                 out.locked_write(format!("READ A BYTE! HANDLING INPUT {:x}...........\n", v).as_bytes());
 954                 match v {
 955                         // In general, we keep related message groups close together in binary form, allowing
 956                         // bit-twiddling mutations to have similar effects. This is probably overkill, but no
 957                         // harm in doing so.
 958
 959                         0x00 => *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
 960                         0x01 => *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
 961                         0x02 => *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
 962                         0x04 => *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
 963                         0x05 => *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
 964                         0x06 => *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
 965
 966                         0x08 => {
 967                                 if let Some((id, _)) = monitor_a.latest_monitors.lock().unwrap().get(&chan_1_funding) {
 968                                         monitor_a.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
 969                                         nodes[0].process_monitor_events();
 970                                 }
 971                         },
 972                         0x09 => {
 973                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_1_funding) {
 974                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
 975                                         nodes[1].process_monitor_events();
 976                                 }
 977                         },
 978                         0x0a => {
 979                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_2_funding) {
 980                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
 981                                         nodes[1].process_monitor_events();
 982                                 }
 983                         },
 984                         0x0b => {
 985                                 if let Some((id, _)) = monitor_c.latest_monitors.lock().unwrap().get(&chan_2_funding) {
 986                                         monitor_c.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
 987                                         nodes[2].process_monitor_events();
 988                                 }
 989                         },
 990
 991                         0x0c => {
 992                                 if !chan_a_disconnected {
 993                                         nodes[0].peer_disconnected(&nodes[1].get_our_node_id());
 994                                         nodes[1].peer_disconnected(&nodes[0].get_our_node_id());
 995                                         chan_a_disconnected = true;
 996                                         drain_msg_events_on_disconnect!(0);
 997                                 }
 998                         },
 999                         0x0d => {
1000                                 if !chan_b_disconnected {
1001                                         nodes[1].peer_disconnected(&nodes[2].get_our_node_id());
1002                                         nodes[2].peer_disconnected(&nodes[1].get_our_node_id());
1003                                         chan_b_disconnected = true;
1004                                         drain_msg_events_on_disconnect!(2);
1005                                 }
1006                         },
1007                         0x0e => {
1008                                 if chan_a_disconnected {
1009                                         nodes[0].peer_connected(&nodes[1].get_our_node_id(), &Init { features: nodes[1].init_features(), remote_network_address: None }, true).unwrap();
1010                                         nodes[1].peer_connected(&nodes[0].get_our_node_id(), &Init { features: nodes[0].init_features(), remote_network_address: None }, false).unwrap();
1011                                         chan_a_disconnected = false;
1012                                 }
1013                         },
1014                         0x0f => {
1015                                 if chan_b_disconnected {
1016                                         nodes[1].peer_connected(&nodes[2].get_our_node_id(), &Init { features: nodes[2].init_features(), remote_network_address: None }, true).unwrap();
1017                                         nodes[2].peer_connected(&nodes[1].get_our_node_id(), &Init { features: nodes[1].init_features(), remote_network_address: None }, false).unwrap();
1018                                         chan_b_disconnected = false;
1019                                 }
1020                         },
1021
1022                         0x10 => { process_msg_events!(0, true, ProcessMessages::AllMessages); },
1023                         0x11 => { process_msg_events!(0, false, ProcessMessages::AllMessages); },
1024                         0x12 => { process_msg_events!(0, true, ProcessMessages::OneMessage); },
1025                         0x13 => { process_msg_events!(0, false, ProcessMessages::OneMessage); },
1026                         0x14 => { process_msg_events!(0, true, ProcessMessages::OnePendingMessage); },
1027                         0x15 => { process_msg_events!(0, false, ProcessMessages::OnePendingMessage); },
1028
1029                         0x16 => { process_events!(0, true); },
1030                         0x17 => { process_events!(0, false); },
1031
1032                         0x18 => { process_msg_events!(1, true, ProcessMessages::AllMessages); },
1033                         0x19 => { process_msg_events!(1, false, ProcessMessages::AllMessages); },
1034                         0x1a => { process_msg_events!(1, true, ProcessMessages::OneMessage); },
1035                         0x1b => { process_msg_events!(1, false, ProcessMessages::OneMessage); },
1036                         0x1c => { process_msg_events!(1, true, ProcessMessages::OnePendingMessage); },
1037                         0x1d => { process_msg_events!(1, false, ProcessMessages::OnePendingMessage); },
1038
1039                         0x1e => { process_events!(1, true); },
1040                         0x1f => { process_events!(1, false); },
1041
1042                         0x20 => { process_msg_events!(2, true, ProcessMessages::AllMessages); },
1043                         0x21 => { process_msg_events!(2, false, ProcessMessages::AllMessages); },
1044                         0x22 => { process_msg_events!(2, true, ProcessMessages::OneMessage); },
1045                         0x23 => { process_msg_events!(2, false, ProcessMessages::OneMessage); },
1046                         0x24 => { process_msg_events!(2, true, ProcessMessages::OnePendingMessage); },
1047                         0x25 => { process_msg_events!(2, false, ProcessMessages::OnePendingMessage); },
1048
1049                         0x26 => { process_events!(2, true); },
1050                         0x27 => { process_events!(2, false); },
1051
1052                         0x2c => {
1053                                 if !chan_a_disconnected {
1054                                         nodes[1].peer_disconnected(&nodes[0].get_our_node_id());
1055                                         chan_a_disconnected = true;
1056                                         drain_msg_events_on_disconnect!(0);
1057                                 }
1058                                 if monitor_a.should_update_manager.load(atomic::Ordering::Relaxed) {
1059                                         node_a_ser.0.clear();
1060                                         nodes[0].write(&mut node_a_ser).unwrap();
1061                                 }
1062                                 let (new_node_a, new_monitor_a) = reload_node!(node_a_ser, 0, monitor_a, keys_manager_a, fee_est_a);
1063                                 nodes[0] = new_node_a;
1064                                 monitor_a = new_monitor_a;
1065                         },
1066                         0x2d => {
1067                                 if !chan_a_disconnected {
1068                                         nodes[0].peer_disconnected(&nodes[1].get_our_node_id());
1069                                         chan_a_disconnected = true;
1070                                         nodes[0].get_and_clear_pending_msg_events();
1071                                         ab_events.clear();
1072                                         ba_events.clear();
1073                                 }
1074                                 if !chan_b_disconnected {
1075                                         nodes[2].peer_disconnected(&nodes[1].get_our_node_id());
1076                                         chan_b_disconnected = true;
1077                                         nodes[2].get_and_clear_pending_msg_events();
1078                                         bc_events.clear();
1079                                         cb_events.clear();
1080                                 }
1081                                 let (new_node_b, new_monitor_b) = reload_node!(node_b_ser, 1, monitor_b, keys_manager_b, fee_est_b);
1082                                 nodes[1] = new_node_b;
1083                                 monitor_b = new_monitor_b;
1084                         },
1085                         0x2e => {
1086                                 if !chan_b_disconnected {
1087                                         nodes[1].peer_disconnected(&nodes[2].get_our_node_id());
1088                                         chan_b_disconnected = true;
1089                                         drain_msg_events_on_disconnect!(2);
1090                                 }
1091                                 if monitor_c.should_update_manager.load(atomic::Ordering::Relaxed) {
1092                                         node_c_ser.0.clear();
1093                                         nodes[2].write(&mut node_c_ser).unwrap();
1094                                 }
1095                                 let (new_node_c, new_monitor_c) = reload_node!(node_c_ser, 2, monitor_c, keys_manager_c, fee_est_c);
1096                                 nodes[2] = new_node_c;
1097                                 monitor_c = new_monitor_c;
1098                         },
1099
1100                         // 1/10th the channel size:
1101                         0x30 => { send_payment(&nodes[0], &nodes[1], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1102                         0x31 => { send_payment(&nodes[1], &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1103                         0x32 => { send_payment(&nodes[1], &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1104                         0x33 => { send_payment(&nodes[2], &nodes[1], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1105                         0x34 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1106                         0x35 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1107
1108                         0x38 => { send_payment(&nodes[0], &nodes[1], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1109                         0x39 => { send_payment(&nodes[1], &nodes[0], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1110                         0x3a => { send_payment(&nodes[1], &nodes[2], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1111                         0x3b => { send_payment(&nodes[2], &nodes[1], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1112                         0x3c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1113                         0x3d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1114
1115                         0x40 => { send_payment(&nodes[0], &nodes[1], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1116                         0x41 => { send_payment(&nodes[1], &nodes[0], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1117                         0x42 => { send_payment(&nodes[1], &nodes[2], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1118                         0x43 => { send_payment(&nodes[2], &nodes[1], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1119                         0x44 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1120                         0x45 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1121
1122                         0x48 => { send_payment(&nodes[0], &nodes[1], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1123                         0x49 => { send_payment(&nodes[1], &nodes[0], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1124                         0x4a => { send_payment(&nodes[1], &nodes[2], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1125                         0x4b => { send_payment(&nodes[2], &nodes[1], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1126                         0x4c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1127                         0x4d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1128
1129                         0x50 => { send_payment(&nodes[0], &nodes[1], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1130                         0x51 => { send_payment(&nodes[1], &nodes[0], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1131                         0x52 => { send_payment(&nodes[1], &nodes[2], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1132                         0x53 => { send_payment(&nodes[2], &nodes[1], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1133                         0x54 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1134                         0x55 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1135
1136                         0x58 => { send_payment(&nodes[0], &nodes[1], chan_a, 100, &mut payment_id, &mut payment_idx); },
1137                         0x59 => { send_payment(&nodes[1], &nodes[0], chan_a, 100, &mut payment_id, &mut payment_idx); },
1138                         0x5a => { send_payment(&nodes[1], &nodes[2], chan_b, 100, &mut payment_id, &mut payment_idx); },
1139                         0x5b => { send_payment(&nodes[2], &nodes[1], chan_b, 100, &mut payment_id, &mut payment_idx); },
1140                         0x5c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 100, &mut payment_id, &mut payment_idx); },
1141                         0x5d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 100, &mut payment_id, &mut payment_idx); },
1142
1143                         0x60 => { send_payment(&nodes[0], &nodes[1], chan_a, 10, &mut payment_id, &mut payment_idx); },
1144                         0x61 => { send_payment(&nodes[1], &nodes[0], chan_a, 10, &mut payment_id, &mut payment_idx); },
1145                         0x62 => { send_payment(&nodes[1], &nodes[2], chan_b, 10, &mut payment_id, &mut payment_idx); },
1146                         0x63 => { send_payment(&nodes[2], &nodes[1], chan_b, 10, &mut payment_id, &mut payment_idx); },
1147                         0x64 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10, &mut payment_id, &mut payment_idx); },
1148                         0x65 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10, &mut payment_id, &mut payment_idx); },
1149
1150                         0x68 => { send_payment(&nodes[0], &nodes[1], chan_a, 1, &mut payment_id, &mut payment_idx); },
1151                         0x69 => { send_payment(&nodes[1], &nodes[0], chan_a, 1, &mut payment_id, &mut payment_idx); },
1152                         0x6a => { send_payment(&nodes[1], &nodes[2], chan_b, 1, &mut payment_id, &mut payment_idx); },
1153                         0x6b => { send_payment(&nodes[2], &nodes[1], chan_b, 1, &mut payment_id, &mut payment_idx); },
1154                         0x6c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1, &mut payment_id, &mut payment_idx); },
1155                         0x6d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1, &mut payment_id, &mut payment_idx); },
1156
1157                         0x80 => {
1158                                 let max_feerate = last_htlc_clear_fee_a * FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1159                                 if fee_est_a.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1160                                         fee_est_a.ret_val.store(max_feerate, atomic::Ordering::Release);
1161                                 }
1162                                 nodes[0].maybe_update_chan_fees();
1163                         },
1164                         0x81 => { fee_est_a.ret_val.store(253, atomic::Ordering::Release); nodes[0].maybe_update_chan_fees(); },
1165
1166                         0x84 => {
1167                                 let max_feerate = last_htlc_clear_fee_b * FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1168                                 if fee_est_b.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1169                                         fee_est_b.ret_val.store(max_feerate, atomic::Ordering::Release);
1170                                 }
1171                                 nodes[1].maybe_update_chan_fees();
1172                         },
1173                         0x85 => { fee_est_b.ret_val.store(253, atomic::Ordering::Release); nodes[1].maybe_update_chan_fees(); },
1174
1175                         0x88 => {
1176                                 let max_feerate = last_htlc_clear_fee_c * FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1177                                 if fee_est_c.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1178                                         fee_est_c.ret_val.store(max_feerate, atomic::Ordering::Release);
1179                                 }
1180                                 nodes[2].maybe_update_chan_fees();
1181                         },
1182                         0x89 => { fee_est_c.ret_val.store(253, atomic::Ordering::Release); nodes[2].maybe_update_chan_fees(); },
1183
1184                         0xff => {
1185                                 // Test that no channel is in a stuck state where neither party can send funds even
1186                                 // after we resolve all pending events.
1187                                 // First make sure there are no pending monitor updates, resetting the error state
1188                                 // and calling force_channel_monitor_updated for each monitor.
1189                                 *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1190                                 *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1191                                 *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1192
1193                                 if let Some((id, _)) = monitor_a.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1194                                         monitor_a.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
1195                                         nodes[0].process_monitor_events();
1196                                 }
1197                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1198                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
1199                                         nodes[1].process_monitor_events();
1200                                 }
1201                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1202                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1203                                         nodes[1].process_monitor_events();
1204                                 }
1205                                 if let Some((id, _)) = monitor_c.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1206                                         monitor_c.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1207                                         nodes[2].process_monitor_events();
1208                                 }
1209
1210                                 // Next, make sure peers are all connected to each other
1211                                 if chan_a_disconnected {
1212                                         nodes[0].peer_connected(&nodes[1].get_our_node_id(), &Init { features: nodes[1].init_features(), remote_network_address: None }, true).unwrap();
1213                                         nodes[1].peer_connected(&nodes[0].get_our_node_id(), &Init { features: nodes[0].init_features(), remote_network_address: None }, false).unwrap();
1214                                         chan_a_disconnected = false;
1215                                 }
1216                                 if chan_b_disconnected {
1217                                         nodes[1].peer_connected(&nodes[2].get_our_node_id(), &Init { features: nodes[2].init_features(), remote_network_address: None }, true).unwrap();
1218                                         nodes[2].peer_connected(&nodes[1].get_our_node_id(), &Init { features: nodes[1].init_features(), remote_network_address: None }, false).unwrap();
1219                                         chan_b_disconnected = false;
1220                                 }
1221
1222                                 for i in 0..std::usize::MAX {
1223                                         if i == 100 { panic!("It may take may iterations to settle the state, but it should not take forever"); }
1224                                         // Then, make sure any current forwards make their way to their destination
1225                                         if process_msg_events!(0, false, ProcessMessages::AllMessages) { continue; }
1226                                         if process_msg_events!(1, false, ProcessMessages::AllMessages) { continue; }
1227                                         if process_msg_events!(2, false, ProcessMessages::AllMessages) { continue; }
1228                                         // ...making sure any pending PendingHTLCsForwardable events are handled and
1229                                         // payments claimed.
1230                                         if process_events!(0, false) { continue; }
1231                                         if process_events!(1, false) { continue; }
1232                                         if process_events!(2, false) { continue; }
1233                                         break;
1234                                 }
1235
1236                                 // Finally, make sure that at least one end of each channel can make a substantial payment
1237                                 assert!(
1238                                         send_payment(&nodes[0], &nodes[1], chan_a, 10_000_000, &mut payment_id, &mut payment_idx) ||
1239                                         send_payment(&nodes[1], &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx));
1240                                 assert!(
1241                                         send_payment(&nodes[1], &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx) ||
1242                                         send_payment(&nodes[2], &nodes[1], chan_b, 10_000_000, &mut payment_id, &mut payment_idx));
1243
1244                                 last_htlc_clear_fee_a = fee_est_a.ret_val.load(atomic::Ordering::Acquire);
1245                                 last_htlc_clear_fee_b = fee_est_b.ret_val.load(atomic::Ordering::Acquire);
1246                                 last_htlc_clear_fee_c = fee_est_c.ret_val.load(atomic::Ordering::Acquire);
1247                         },
1248                         _ => test_return!(),
1249                 }
1250
1251                 node_a_ser.0.clear();
1252                 nodes[0].write(&mut node_a_ser).unwrap();
1253                 monitor_a.should_update_manager.store(false, atomic::Ordering::Relaxed);
1254                 node_b_ser.0.clear();
1255                 nodes[1].write(&mut node_b_ser).unwrap();
1256                 monitor_b.should_update_manager.store(false, atomic::Ordering::Relaxed);
1257                 node_c_ser.0.clear();
1258                 nodes[2].write(&mut node_c_ser).unwrap();
1259                 monitor_c.should_update_manager.store(false, atomic::Ordering::Relaxed);
1260         }
1261 }
1262
1263 /// We actually have different behavior based on if a certain log string has been seen, so we have
1264 /// to do a bit more tracking.
1265 #[derive(Clone)]
1266 struct SearchingOutput<O: Output> {
1267         output: O,
1268         may_fail: Arc<atomic::AtomicBool>,
1269 }
1270 impl<O: Output> Output for SearchingOutput<O> {
1271         fn locked_write(&self, data: &[u8]) {
1272                 // We hit a design limitation of LN state machine (see CONCURRENT_INBOUND_HTLC_FEE_BUFFER)
1273                 if std::str::from_utf8(data).unwrap().contains("Outbound update_fee HTLC buffer overflow - counterparty should force-close this channel") {
1274                         self.may_fail.store(true, atomic::Ordering::Release);
1275                 }
1276                 self.output.locked_write(data)
1277         }
1278 }
1279 impl<O: Output> SearchingOutput<O> {
1280         pub fn new(output: O) -> Self {
1281                 Self { output, may_fail: Arc::new(atomic::AtomicBool::new(false)) }
1282         }
1283 }
1284
1285 pub fn chanmon_consistency_test<Out: Output>(data: &[u8], out: Out) {
1286         do_test(data, out);
1287 }
1288
1289 #[no_mangle]
1290 pub extern "C" fn chanmon_consistency_run(data: *const u8, datalen: usize) {
1291         do_test(unsafe { std::slice::from_raw_parts(data, datalen) }, test_logger::DevNull{});
1292 }