_ Git - rust-lightning/blob - fuzz/src/chanmon_consistency.rs

   1 // This file is Copyright its original authors, visible in version control
   2 // history.
   3 //
   4 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
   5 // or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
   7 // You may not use this file except in accordance with one or both of these
   8 // licenses.
   9
  10 //! Test that monitor update failures don't get our channel state out of sync.
  11 //! One of the biggest concern with the monitor update failure handling code is that messages
  12 //! resent after monitor updating is restored are delivered out-of-order, resulting in
  13 //! commitment_signed messages having "invalid signatures".
  14 //! To test this we stand up a network of three nodes and read bytes from the fuzz input to denote
  15 //! actions such as sending payments, handling events, or changing monitor update return values on
  16 //! a per-node basis. This should allow it to find any cases where the ordering of actions results
  17 //! in us getting out of sync with ourselves, and, assuming at least one of our recieve- or
  18 //! send-side handling is correct, other peers. We consider it a failure if any action results in a
  19 //! channel being force-closed.
  20
  21 use bitcoin::blockdata::constants::genesis_block;
  22 use bitcoin::blockdata::transaction::{Transaction, TxOut};
  23 use bitcoin::blockdata::script::{Builder, Script};
  24 use bitcoin::blockdata::opcodes;
  25 use bitcoin::blockdata::locktime::PackedLockTime;
  26 use bitcoin::network::constants::Network;
  27
  28 use bitcoin::hashes::Hash as TraitImport;
  29 use bitcoin::hashes::sha256::Hash as Sha256;
  30 use bitcoin::hashes::sha256d::Hash as Sha256dHash;
  31 use bitcoin::hash_types::{BlockHash, WPubkeyHash};
  32
  33 use lightning::chain;
  34 use lightning::chain::{BestBlock, ChannelMonitorUpdateStatus, chainmonitor, channelmonitor, Confirm, Watch};
  35 use lightning::chain::channelmonitor::{ChannelMonitor, MonitorEvent};
  36 use lightning::chain::transaction::OutPoint;
  37 use lightning::chain::chaininterface::{BroadcasterInterface, ConfirmationTarget, FeeEstimator};
  38 use lightning::sign::{KeyMaterial, InMemorySigner, Recipient, EntropySource, NodeSigner, SignerProvider};
  39 use lightning::events;
  40 use lightning::events::MessageSendEventsProvider;
  41 use lightning::ln::{PaymentHash, PaymentPreimage, PaymentSecret};
  42 use lightning::ln::channelmanager::{ChainParameters, ChannelDetails, ChannelManager, PaymentSendFailure, ChannelManagerReadArgs, PaymentId, RecipientOnionFields};
  43 use lightning::ln::channel::FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE;
  44 use lightning::ln::msgs::{self, CommitmentUpdate, ChannelMessageHandler, DecodeError, UpdateAddHTLC, Init};
  45 use lightning::ln::script::ShutdownScript;
  46 use lightning::ln::functional_test_utils::*;
  47 use lightning::util::enforcing_trait_impls::{EnforcingSigner, EnforcementState};
  48 use lightning::util::errors::APIError;
  49 use lightning::util::logger::Logger;
  50 use lightning::util::config::UserConfig;
  51 use lightning::util::ser::{Readable, ReadableArgs, Writeable, Writer};
  52 use lightning::routing::router::{InFlightHtlcs, Path, Route, RouteHop, RouteParameters, Router};
  53
  54 use crate::utils::test_logger::{self, Output};
  55 use crate::utils::test_persister::TestPersister;
  56
  57 use bitcoin::secp256k1::{Message, PublicKey, SecretKey, Scalar, Secp256k1};
  58 use bitcoin::secp256k1::ecdh::SharedSecret;
  59 use bitcoin::secp256k1::ecdsa::{RecoverableSignature, Signature};
  60
  61 use std::mem;
  62 use std::cmp::{self, Ordering};
  63 use hashbrown::{HashSet, hash_map, HashMap};
  64 use std::sync::{Arc,Mutex};
  65 use std::sync::atomic;
  66 use std::io::Cursor;
  67 use bitcoin::bech32::u5;
  68
  69 const MAX_FEE: u32 = 10_000;
  70 struct FuzzEstimator {
  71         ret_val: atomic::AtomicU32,
  72 }
  73 impl FeeEstimator for FuzzEstimator {
  74         fn get_est_sat_per_1000_weight(&self, conf_target: ConfirmationTarget) -> u32 {
  75                 // We force-close channels if our counterparty sends us a feerate which is a small multiple
  76                 // of our HighPriority fee estimate or smaller than our Background fee estimate. Thus, we
  77                 // always return a HighPriority feerate here which is >= the maximum Normal feerate and a
  78                 // Background feerate which is <= the minimum Normal feerate.
  79                 match conf_target {
  80                         ConfirmationTarget::HighPriority => MAX_FEE,
  81                         ConfirmationTarget::Background => 253,
  82                         ConfirmationTarget::Normal => cmp::min(self.ret_val.load(atomic::Ordering::Acquire), MAX_FEE),
  83                 }
  84         }
  85 }
  86
  87 struct FuzzRouter {}
  88
  89 impl Router for FuzzRouter {
  90         fn find_route(
  91                 &self, _payer: &PublicKey, _params: &RouteParameters, _first_hops: Option<&[&ChannelDetails]>,
  92                 _inflight_htlcs: &InFlightHtlcs
  93         ) -> Result<Route, msgs::LightningError> {
  94                 Err(msgs::LightningError {
  95                         err: String::from("Not implemented"),
  96                         action: msgs::ErrorAction::IgnoreError
  97                 })
  98         }
  99 }
 100
 101 pub struct TestBroadcaster {}
 102 impl BroadcasterInterface for TestBroadcaster {
 103         fn broadcast_transactions(&self, _txs: &[&Transaction]) { }
 104 }
 105
 106 pub struct VecWriter(pub Vec<u8>);
 107 impl Writer for VecWriter {
 108         fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
 109                 self.0.extend_from_slice(buf);
 110                 Ok(())
 111         }
 112 }
 113
 114 struct TestChainMonitor {
 115         pub logger: Arc<dyn Logger>,
 116         pub keys: Arc<KeyProvider>,
 117         pub persister: Arc<TestPersister>,
 118         pub chain_monitor: Arc<chainmonitor::ChainMonitor<EnforcingSigner, Arc<dyn chain::Filter>, Arc<TestBroadcaster>, Arc<FuzzEstimator>, Arc<dyn Logger>, Arc<TestPersister>>>,
 119         // If we reload a node with an old copy of ChannelMonitors, the ChannelManager deserialization
 120         // logic will automatically force-close our channels for us (as we don't have an up-to-date
 121         // monitor implying we are not able to punish misbehaving counterparties). Because this test
 122         // "fails" if we ever force-close a channel, we avoid doing so, always saving the latest
 123         // fully-serialized monitor state here, as well as the corresponding update_id.
 124         pub latest_monitors: Mutex<HashMap<OutPoint, (u64, Vec<u8>)>>,
 125         pub should_update_manager: atomic::AtomicBool,
 126 }
 127 impl TestChainMonitor {
 128         pub fn new(broadcaster: Arc<TestBroadcaster>, logger: Arc<dyn Logger>, feeest: Arc<FuzzEstimator>, persister: Arc<TestPersister>, keys: Arc<KeyProvider>) -> Self {
 129                 Self {
 130                         chain_monitor: Arc::new(chainmonitor::ChainMonitor::new(None, broadcaster, logger.clone(), feeest, Arc::clone(&persister))),
 131                         logger,
 132                         keys,
 133                         persister,
 134                         latest_monitors: Mutex::new(HashMap::new()),
 135                         should_update_manager: atomic::AtomicBool::new(false),
 136                 }
 137         }
 138 }
 139 impl chain::Watch<EnforcingSigner> for TestChainMonitor {
 140         fn watch_channel(&self, funding_txo: OutPoint, monitor: channelmonitor::ChannelMonitor<EnforcingSigner>) -> chain::ChannelMonitorUpdateStatus {
 141                 let mut ser = VecWriter(Vec::new());
 142                 monitor.write(&mut ser).unwrap();
 143                 if let Some(_) = self.latest_monitors.lock().unwrap().insert(funding_txo, (monitor.get_latest_update_id(), ser.0)) {
 144                         panic!("Already had monitor pre-watch_channel");
 145                 }
 146                 self.should_update_manager.store(true, atomic::Ordering::Relaxed);
 147                 self.chain_monitor.watch_channel(funding_txo, monitor)
 148         }
 149
 150         fn update_channel(&self, funding_txo: OutPoint, update: &channelmonitor::ChannelMonitorUpdate) -> chain::ChannelMonitorUpdateStatus {
 151                 let mut map_lock = self.latest_monitors.lock().unwrap();
 152                 let mut map_entry = match map_lock.entry(funding_txo) {
 153                         hash_map::Entry::Occupied(entry) => entry,
 154                         hash_map::Entry::Vacant(_) => panic!("Didn't have monitor on update call"),
 155                 };
 156                 let deserialized_monitor = <(BlockHash, channelmonitor::ChannelMonitor<EnforcingSigner>)>::
 157                         read(&mut Cursor::new(&map_entry.get().1), (&*self.keys, &*self.keys)).unwrap().1;
 158                 deserialized_monitor.update_monitor(update, &&TestBroadcaster{}, &FuzzEstimator { ret_val: atomic::AtomicU32::new(253) }, &self.logger).unwrap();
 159                 let mut ser = VecWriter(Vec::new());
 160                 deserialized_monitor.write(&mut ser).unwrap();
 161                 map_entry.insert((update.update_id, ser.0));
 162                 self.should_update_manager.store(true, atomic::Ordering::Relaxed);
 163                 self.chain_monitor.update_channel(funding_txo, update)
 164         }
 165
 166         fn release_pending_monitor_events(&self) -> Vec<(OutPoint, Vec<MonitorEvent>, Option<PublicKey>)> {
 167                 return self.chain_monitor.release_pending_monitor_events();
 168         }
 169 }
 170
 171 struct KeyProvider {
 172         node_secret: SecretKey,
 173         rand_bytes_id: atomic::AtomicU32,
 174         enforcement_states: Mutex<HashMap<[u8;32], Arc<Mutex<EnforcementState>>>>,
 175 }
 176
 177 impl EntropySource for KeyProvider {
 178         fn get_secure_random_bytes(&self) -> [u8; 32] {
 179                 let id = self.rand_bytes_id.fetch_add(1, atomic::Ordering::Relaxed);
 180                 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]];
 181                 res[30-4..30].copy_from_slice(&id.to_le_bytes());
 182                 res
 183         }
 184 }
 185
 186 impl NodeSigner for KeyProvider {
 187         fn get_node_id(&self, recipient: Recipient) -> Result<PublicKey, ()> {
 188                 let node_secret = match recipient {
 189                         Recipient::Node => Ok(&self.node_secret),
 190                         Recipient::PhantomNode => Err(())
 191                 }?;
 192                 Ok(PublicKey::from_secret_key(&Secp256k1::signing_only(), node_secret))
 193         }
 194
 195         fn ecdh(&self, recipient: Recipient, other_key: &PublicKey, tweak: Option<&Scalar>) -> Result<SharedSecret, ()> {
 196                 let mut node_secret = match recipient {
 197                         Recipient::Node => Ok(self.node_secret.clone()),
 198                         Recipient::PhantomNode => Err(())
 199                 }?;
 200                 if let Some(tweak) = tweak {
 201                         node_secret = node_secret.mul_tweak(tweak).map_err(|_| ())?;
 202                 }
 203                 Ok(SharedSecret::new(other_key, &node_secret))
 204         }
 205
 206         fn get_inbound_payment_key_material(&self) -> KeyMaterial {
 207                 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]])
 208         }
 209
 210         fn sign_invoice(&self, _hrp_bytes: &[u8], _invoice_data: &[u5], _recipient: Recipient) -> Result<RecoverableSignature, ()> {
 211                 unreachable!()
 212         }
 213
 214         fn sign_gossip_message(&self, msg: lightning::ln::msgs::UnsignedGossipMessage) -> Result<Signature, ()> {
 215                 let msg_hash = Message::from_slice(&Sha256dHash::hash(&msg.encode()[..])[..]).map_err(|_| ())?;
 216                 let secp_ctx = Secp256k1::signing_only();
 217                 Ok(secp_ctx.sign_ecdsa(&msg_hash, &self.node_secret))
 218         }
 219 }
 220
 221 impl SignerProvider for KeyProvider {
 222         type Signer = EnforcingSigner;
 223
 224         fn generate_channel_keys_id(&self, _inbound: bool, _channel_value_satoshis: u64, _user_channel_id: u128) -> [u8; 32] {
 225                 let id = self.rand_bytes_id.fetch_add(1, atomic::Ordering::Relaxed) as u8;
 226                 [id; 32]
 227         }
 228
 229         fn derive_channel_signer(&self, channel_value_satoshis: u64, channel_keys_id: [u8; 32]) -> Self::Signer {
 230                 let secp_ctx = Secp256k1::signing_only();
 231                 let id = channel_keys_id[0];
 232                 let keys = InMemorySigner::new(
 233                         &secp_ctx,
 234                         SecretKey::from_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, self.node_secret[31]]).unwrap(),
 235                         SecretKey::from_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 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, 6, 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, 7, 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, 8, self.node_secret[31]]).unwrap(),
 239                         [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]],
 240                         channel_value_satoshis,
 241                         channel_keys_id,
 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 = ReadableArgs::read(&mut reader, self)?;
 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) -> Result<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                 Ok(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) -> Result<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                 Ok(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, sendable_bounds_violated: bool) {
 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 send less than our next-HTLC minimum - ") => {},
 300                                 _ if err.starts_with("Cannot send more than our next-HTLC maximum - ") => {},
 301                                 _ => panic!("{}", err),
 302                         }
 303                         assert!(sendable_bounds_violated);
 304                 },
 305                 APIError::MonitorUpdateInProgress => {
 306                         // We can (obviously) temp-fail a monitor update
 307                 },
 308                 APIError::IncompatibleShutdownScript { .. } => panic!("Cannot send an incompatible shutdown script"),
 309         }
 310 }
 311 #[inline]
 312 fn check_payment_err(send_err: PaymentSendFailure, sendable_bounds_violated: bool) {
 313         match send_err {
 314                 PaymentSendFailure::ParameterError(api_err) => check_api_err(api_err, sendable_bounds_violated),
 315                 PaymentSendFailure::PathParameterError(per_path_results) => {
 316                         for res in per_path_results { if let Err(api_err) = res { check_api_err(api_err, sendable_bounds_violated); } }
 317                 },
 318                 PaymentSendFailure::AllFailedResendSafe(per_path_results) => {
 319                         for api_err in per_path_results { check_api_err(api_err, sendable_bounds_violated); }
 320                 },
 321                 PaymentSendFailure::PartialFailure { results, .. } => {
 322                         for res in results { if let Err(api_err) = res { check_api_err(api_err, sendable_bounds_violated); } }
 323                 },
 324                 PaymentSendFailure::DuplicatePayment => panic!(),
 325         }
 326 }
 327
 328 type ChanMan<'a> = ChannelManager<Arc<TestChainMonitor>, Arc<TestBroadcaster>, Arc<KeyProvider>, Arc<KeyProvider>, Arc<KeyProvider>, Arc<FuzzEstimator>, &'a FuzzRouter, Arc<dyn Logger>>;
 329
 330 #[inline]
 331 fn get_payment_secret_hash(dest: &ChanMan, payment_id: &mut u8) -> Option<(PaymentSecret, PaymentHash)> {
 332         let mut payment_hash;
 333         for _ in 0..256 {
 334                 payment_hash = PaymentHash(Sha256::hash(&[*payment_id; 1]).into_inner());
 335                 if let Ok(payment_secret) = dest.create_inbound_payment_for_hash(payment_hash, None, 3600, None) {
 336                         return Some((payment_secret, payment_hash));
 337                 }
 338                 *payment_id = payment_id.wrapping_add(1);
 339         }
 340         None
 341 }
 342
 343 #[inline]
 344 fn send_payment(source: &ChanMan, dest: &ChanMan, dest_chan_id: u64, amt: u64, payment_id: &mut u8, payment_idx: &mut u64) -> bool {
 345         let (payment_secret, payment_hash) =
 346                 if let Some((secret, hash)) = get_payment_secret_hash(dest, payment_id) { (secret, hash) } else { return true; };
 347         let mut payment_id = [0; 32];
 348         payment_id[0..8].copy_from_slice(&payment_idx.to_ne_bytes());
 349         *payment_idx += 1;
 350         let (min_value_sendable, max_value_sendable) = source.list_usable_channels()
 351                 .iter().find(|chan| chan.short_channel_id == Some(dest_chan_id))
 352                 .map(|chan|
 353                         (chan.next_outbound_htlc_minimum_msat, chan.next_outbound_htlc_limit_msat))
 354                 .unwrap_or((0, 0));
 355         if let Err(err) = source.send_payment_with_route(&Route {
 356                 paths: vec![Path { hops: vec![RouteHop {
 357                         pubkey: dest.get_our_node_id(),
 358                         node_features: dest.node_features(),
 359                         short_channel_id: dest_chan_id,
 360                         channel_features: dest.channel_features(),
 361                         fee_msat: amt,
 362                         cltv_expiry_delta: 200,
 363                 }], blinded_tail: None }],
 364                 payment_params: None,
 365         }, payment_hash, RecipientOnionFields::secret_only(payment_secret), PaymentId(payment_id)) {
 366                 check_payment_err(err, amt > max_value_sendable || amt < min_value_sendable);
 367                 false
 368         } else {
 369                 // Note that while the max is a strict upper-bound, we can occasionally send substantially
 370                 // below the minimum, with some gap which is unusable immediately below the minimum. Thus,
 371                 // we don't check against min_value_sendable here.
 372                 assert!(amt <= max_value_sendable);
 373                 true
 374         }
 375 }
 376 #[inline]
 377 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 {
 378         let (payment_secret, payment_hash) =
 379                 if let Some((secret, hash)) = get_payment_secret_hash(dest, payment_id) { (secret, hash) } else { return true; };
 380         let mut payment_id = [0; 32];
 381         payment_id[0..8].copy_from_slice(&payment_idx.to_ne_bytes());
 382         *payment_idx += 1;
 383         let (min_value_sendable, max_value_sendable) = source.list_usable_channels()
 384                 .iter().find(|chan| chan.short_channel_id == Some(middle_chan_id))
 385                 .map(|chan|
 386                         (chan.next_outbound_htlc_minimum_msat, chan.next_outbound_htlc_limit_msat))
 387                 .unwrap_or((0, 0));
 388         let first_hop_fee = 50_000;
 389         if let Err(err) = source.send_payment_with_route(&Route {
 390                 paths: vec![Path { hops: vec![RouteHop {
 391                         pubkey: middle.get_our_node_id(),
 392                         node_features: middle.node_features(),
 393                         short_channel_id: middle_chan_id,
 394                         channel_features: middle.channel_features(),
 395                         fee_msat: first_hop_fee,
 396                         cltv_expiry_delta: 100,
 397                 },RouteHop {
 398                         pubkey: dest.get_our_node_id(),
 399                         node_features: dest.node_features(),
 400                         short_channel_id: dest_chan_id,
 401                         channel_features: dest.channel_features(),
 402                         fee_msat: amt,
 403                         cltv_expiry_delta: 200,
 404                 }], blinded_tail: None }],
 405                 payment_params: None,
 406         }, payment_hash, RecipientOnionFields::secret_only(payment_secret), PaymentId(payment_id)) {
 407                 let sent_amt = amt + first_hop_fee;
 408                 check_payment_err(err, sent_amt < min_value_sendable || sent_amt > max_value_sendable);
 409                 false
 410         } else {
 411                 // Note that while the max is a strict upper-bound, we can occasionally send substantially
 412                 // below the minimum, with some gap which is unusable immediately below the minimum. Thus,
 413                 // we don't check against min_value_sendable here.
 414                 assert!(amt + first_hop_fee <= max_value_sendable);
 415                 true
 416         }
 417 }
 418
 419 #[inline]
 420 pub fn do_test<Out: Output>(data: &[u8], underlying_out: Out) {
 421         let out = SearchingOutput::new(underlying_out);
 422         let broadcast = Arc::new(TestBroadcaster{});
 423         let router = FuzzRouter {};
 424
 425         macro_rules! make_node {
 426                 ($node_id: expr, $fee_estimator: expr) => { {
 427                         let logger: Arc<dyn Logger> = Arc::new(test_logger::TestLogger::new($node_id.to_string(), out.clone()));
 428                         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();
 429                         let keys_manager = Arc::new(KeyProvider { node_secret, rand_bytes_id: atomic::AtomicU32::new(0), enforcement_states: Mutex::new(HashMap::new()) });
 430                         let monitor = Arc::new(TestChainMonitor::new(broadcast.clone(), logger.clone(), $fee_estimator.clone(),
 431                                 Arc::new(TestPersister {
 432                                         update_ret: Mutex::new(ChannelMonitorUpdateStatus::Completed)
 433                                 }), Arc::clone(&keys_manager)));
 434
 435                         let mut config = UserConfig::default();
 436                         config.channel_config.forwarding_fee_proportional_millionths = 0;
 437                         config.channel_handshake_config.announced_channel = true;
 438                         let network = Network::Bitcoin;
 439                         let params = ChainParameters {
 440                                 network,
 441                                 best_block: BestBlock::from_network(network),
 442                         };
 443                         (ChannelManager::new($fee_estimator.clone(), monitor.clone(), broadcast.clone(), &router, Arc::clone(&logger), keys_manager.clone(), keys_manager.clone(), keys_manager.clone(), config, params),
 444                         monitor, keys_manager)
 445                 } }
 446         }
 447
 448         macro_rules! reload_node {
 449                 ($ser: expr, $node_id: expr, $old_monitors: expr, $keys_manager: expr, $fee_estimator: expr) => { {
 450                     let keys_manager = Arc::clone(& $keys_manager);
 451                         let logger: Arc<dyn Logger> = Arc::new(test_logger::TestLogger::new($node_id.to_string(), out.clone()));
 452                         let chain_monitor = Arc::new(TestChainMonitor::new(broadcast.clone(), logger.clone(), $fee_estimator.clone(),
 453                                 Arc::new(TestPersister {
 454                                         update_ret: Mutex::new(ChannelMonitorUpdateStatus::Completed)
 455                                 }), Arc::clone(& $keys_manager)));
 456
 457                         let mut config = UserConfig::default();
 458                         config.channel_config.forwarding_fee_proportional_millionths = 0;
 459                         config.channel_handshake_config.announced_channel = true;
 460
 461                         let mut monitors = HashMap::new();
 462                         let mut old_monitors = $old_monitors.latest_monitors.lock().unwrap();
 463                         for (outpoint, (update_id, monitor_ser)) in old_monitors.drain() {
 464                                 monitors.insert(outpoint, <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(&mut Cursor::new(&monitor_ser), (&*$keys_manager, &*$keys_manager)).expect("Failed to read monitor").1);
 465                                 chain_monitor.latest_monitors.lock().unwrap().insert(outpoint, (update_id, monitor_ser));
 466                         }
 467                         let mut monitor_refs = HashMap::new();
 468                         for (outpoint, monitor) in monitors.iter_mut() {
 469                                 monitor_refs.insert(*outpoint, monitor);
 470                         }
 471
 472                         let read_args = ChannelManagerReadArgs {
 473                                 entropy_source: keys_manager.clone(),
 474                                 node_signer: keys_manager.clone(),
 475                                 signer_provider: keys_manager.clone(),
 476                                 fee_estimator: $fee_estimator.clone(),
 477                                 chain_monitor: chain_monitor.clone(),
 478                                 tx_broadcaster: broadcast.clone(),
 479                                 router: &router,
 480                                 logger,
 481                                 default_config: config,
 482                                 channel_monitors: monitor_refs,
 483                         };
 484
 485                         let res = (<(BlockHash, ChanMan)>::read(&mut Cursor::new(&$ser.0), read_args).expect("Failed to read manager").1, chain_monitor.clone());
 486                         for (funding_txo, mon) in monitors.drain() {
 487                                 assert_eq!(chain_monitor.chain_monitor.watch_channel(funding_txo, mon),
 488                                         ChannelMonitorUpdateStatus::Completed);
 489                         }
 490                         res
 491                 } }
 492         }
 493
 494         let mut channel_txn = Vec::new();
 495         macro_rules! make_channel {
 496                 ($source: expr, $dest: expr, $chan_id: expr) => { {
 497                         $source.peer_connected(&$dest.get_our_node_id(), &Init { features: $dest.init_features(), remote_network_address: None }, true).unwrap();
 498                         $dest.peer_connected(&$source.get_our_node_id(), &Init { features: $source.init_features(), remote_network_address: None }, false).unwrap();
 499
 500                         $source.create_channel($dest.get_our_node_id(), 100_000, 42, 0, None).unwrap();
 501                         let open_channel = {
 502                                 let events = $source.get_and_clear_pending_msg_events();
 503                                 assert_eq!(events.len(), 1);
 504                                 if let events::MessageSendEvent::SendOpenChannel { ref msg, .. } = events[0] {
 505                                         msg.clone()
 506                                 } else { panic!("Wrong event type"); }
 507                         };
 508
 509                         $dest.handle_open_channel(&$source.get_our_node_id(), &open_channel);
 510                         let accept_channel = {
 511                                 let events = $dest.get_and_clear_pending_msg_events();
 512                                 assert_eq!(events.len(), 1);
 513                                 if let events::MessageSendEvent::SendAcceptChannel { ref msg, .. } = events[0] {
 514                                         msg.clone()
 515                                 } else { panic!("Wrong event type"); }
 516                         };
 517
 518                         $source.handle_accept_channel(&$dest.get_our_node_id(), &accept_channel);
 519                         let funding_output;
 520                         {
 521                                 let events = $source.get_and_clear_pending_events();
 522                                 assert_eq!(events.len(), 1);
 523                                 if let events::Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, .. } = events[0] {
 524                                         let tx = Transaction { version: $chan_id, lock_time: PackedLockTime::ZERO, input: Vec::new(), output: vec![TxOut {
 525                                                 value: *channel_value_satoshis, script_pubkey: output_script.clone(),
 526                                         }]};
 527                                         funding_output = OutPoint { txid: tx.txid(), index: 0 };
 528                                         $source.funding_transaction_generated(&temporary_channel_id, &$dest.get_our_node_id(), tx.clone()).unwrap();
 529                                         channel_txn.push(tx);
 530                                 } else { panic!("Wrong event type"); }
 531                         }
 532
 533                         let funding_created = {
 534                                 let events = $source.get_and_clear_pending_msg_events();
 535                                 assert_eq!(events.len(), 1);
 536                                 if let events::MessageSendEvent::SendFundingCreated { ref msg, .. } = events[0] {
 537                                         msg.clone()
 538                                 } else { panic!("Wrong event type"); }
 539                         };
 540                         $dest.handle_funding_created(&$source.get_our_node_id(), &funding_created);
 541
 542                         let funding_signed = {
 543                                 let events = $dest.get_and_clear_pending_msg_events();
 544                                 assert_eq!(events.len(), 1);
 545                                 if let events::MessageSendEvent::SendFundingSigned { ref msg, .. } = events[0] {
 546                                         msg.clone()
 547                                 } else { panic!("Wrong event type"); }
 548                         };
 549                         let events = $dest.get_and_clear_pending_events();
 550                         assert_eq!(events.len(), 1);
 551                         if let events::Event::ChannelPending{ ref counterparty_node_id, .. } = events[0] {
 552                                 assert_eq!(counterparty_node_id, &$source.get_our_node_id());
 553                         } else { panic!("Wrong event type"); }
 554
 555                         $source.handle_funding_signed(&$dest.get_our_node_id(), &funding_signed);
 556                         let events = $source.get_and_clear_pending_events();
 557                         assert_eq!(events.len(), 1);
 558                         if let events::Event::ChannelPending{ ref counterparty_node_id, .. } = events[0] {
 559                                 assert_eq!(counterparty_node_id, &$dest.get_our_node_id());
 560                         } else { panic!("Wrong event type"); }
 561
 562                         funding_output
 563                 } }
 564         }
 565
 566         macro_rules! confirm_txn {
 567                 ($node: expr) => { {
 568                         let chain_hash = genesis_block(Network::Bitcoin).block_hash();
 569                         let mut header = create_dummy_header(chain_hash, 42);
 570                         let txdata: Vec<_> = channel_txn.iter().enumerate().map(|(i, tx)| (i + 1, tx)).collect();
 571                         $node.transactions_confirmed(&header, &txdata, 1);
 572                         for _ in 2..100 {
 573                                 header = create_dummy_header(header.block_hash(), 42);
 574                         }
 575                         $node.best_block_updated(&header, 99);
 576                 } }
 577         }
 578
 579         macro_rules! lock_fundings {
 580                 ($nodes: expr) => { {
 581                         let mut node_events = Vec::new();
 582                         for node in $nodes.iter() {
 583                                 node_events.push(node.get_and_clear_pending_msg_events());
 584                         }
 585                         for (idx, node_event) in node_events.iter().enumerate() {
 586                                 for event in node_event {
 587                                         if let events::MessageSendEvent::SendChannelReady { ref node_id, ref msg } = event {
 588                                                 for node in $nodes.iter() {
 589                                                         if node.get_our_node_id() == *node_id {
 590                                                                 node.handle_channel_ready(&$nodes[idx].get_our_node_id(), msg);
 591                                                         }
 592                                                 }
 593                                         } else { panic!("Wrong event type"); }
 594                                 }
 595                         }
 596
 597                         for node in $nodes.iter() {
 598                                 let events = node.get_and_clear_pending_msg_events();
 599                                 for event in events {
 600                                         if let events::MessageSendEvent::SendAnnouncementSignatures { .. } = event {
 601                                         } else { panic!("Wrong event type"); }
 602                                 }
 603                         }
 604                 } }
 605         }
 606
 607         let fee_est_a = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 608         let mut last_htlc_clear_fee_a =  253;
 609         let fee_est_b = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 610         let mut last_htlc_clear_fee_b =  253;
 611         let fee_est_c = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 612         let mut last_htlc_clear_fee_c =  253;
 613
 614         // 3 nodes is enough to hit all the possible cases, notably unknown-source-unknown-dest
 615         // forwarding.
 616         let (node_a, mut monitor_a, keys_manager_a) = make_node!(0, fee_est_a);
 617         let (node_b, mut monitor_b, keys_manager_b) = make_node!(1, fee_est_b);
 618         let (node_c, mut monitor_c, keys_manager_c) = make_node!(2, fee_est_c);
 619
 620         let mut nodes = [node_a, node_b, node_c];
 621
 622         let chan_1_funding = make_channel!(nodes[0], nodes[1], 0);
 623         let chan_2_funding = make_channel!(nodes[1], nodes[2], 1);
 624
 625         for node in nodes.iter() {
 626                 confirm_txn!(node);
 627         }
 628
 629         lock_fundings!(nodes);
 630
 631         let chan_a = nodes[0].list_usable_channels()[0].short_channel_id.unwrap();
 632         let chan_b = nodes[2].list_usable_channels()[0].short_channel_id.unwrap();
 633
 634         let mut payment_id: u8 = 0;
 635         let mut payment_idx: u64 = 0;
 636
 637         let mut chan_a_disconnected = false;
 638         let mut chan_b_disconnected = false;
 639         let mut ab_events = Vec::new();
 640         let mut ba_events = Vec::new();
 641         let mut bc_events = Vec::new();
 642         let mut cb_events = Vec::new();
 643
 644         let mut node_a_ser = VecWriter(Vec::new());
 645         nodes[0].write(&mut node_a_ser).unwrap();
 646         let mut node_b_ser = VecWriter(Vec::new());
 647         nodes[1].write(&mut node_b_ser).unwrap();
 648         let mut node_c_ser = VecWriter(Vec::new());
 649         nodes[2].write(&mut node_c_ser).unwrap();
 650
 651         macro_rules! test_return {
 652                 () => { {
 653                         assert_eq!(nodes[0].list_channels().len(), 1);
 654                         assert_eq!(nodes[1].list_channels().len(), 2);
 655                         assert_eq!(nodes[2].list_channels().len(), 1);
 656                         return;
 657                 } }
 658         }
 659
 660         let mut read_pos = 0;
 661         macro_rules! get_slice {
 662                 ($len: expr) => {
 663                         {
 664                                 let slice_len = $len as usize;
 665                                 if data.len() < read_pos + slice_len {
 666                                         test_return!();
 667                                 }
 668                                 read_pos += slice_len;
 669                                 &data[read_pos - slice_len..read_pos]
 670                         }
 671                 }
 672         }
 673
 674         loop {
 675                 // Push any events from Node B onto ba_events and bc_events
 676                 macro_rules! push_excess_b_events {
 677                         ($excess_events: expr, $expect_drop_node: expr) => { {
 678                                 let a_id = nodes[0].get_our_node_id();
 679                                 let expect_drop_node: Option<usize> = $expect_drop_node;
 680                                 let expect_drop_id = if let Some(id) = expect_drop_node { Some(nodes[id].get_our_node_id()) } else { None };
 681                                 for event in $excess_events {
 682                                         let push_a = match event {
 683                                                 events::MessageSendEvent::UpdateHTLCs { ref node_id, .. } => {
 684                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 685                                                         *node_id == a_id
 686                                                 },
 687                                                 events::MessageSendEvent::SendRevokeAndACK { ref node_id, .. } => {
 688                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 689                                                         *node_id == a_id
 690                                                 },
 691                                                 events::MessageSendEvent::SendChannelReestablish { ref node_id, .. } => {
 692                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 693                                                         *node_id == a_id
 694                                                 },
 695                                                 events::MessageSendEvent::SendChannelReady { .. } => continue,
 696                                                 events::MessageSendEvent::SendAnnouncementSignatures { .. } => continue,
 697                                                 events::MessageSendEvent::SendChannelUpdate { ref node_id, ref msg } => {
 698                                                         assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 699                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 700                                                         *node_id == a_id
 701                                                 },
 702                                                 _ => panic!("Unhandled message event {:?}", event),
 703                                         };
 704                                         if push_a { ba_events.push(event); } else { bc_events.push(event); }
 705                                 }
 706                         } }
 707                 }
 708
 709                 // While delivering messages, we select across three possible message selection processes
 710                 // to ensure we get as much coverage as possible. See the individual enum variants for more
 711                 // details.
 712                 #[derive(PartialEq)]
 713                 enum ProcessMessages {
 714                         /// Deliver all available messages, including fetching any new messages from
 715                         /// `get_and_clear_pending_msg_events()` (which may have side effects).
 716                         AllMessages,
 717                         /// Call `get_and_clear_pending_msg_events()` first, and then deliver up to one
 718                         /// message (which may already be queued).
 719                         OneMessage,
 720                         /// Deliver up to one already-queued message. This avoids any potential side-effects
 721                         /// of `get_and_clear_pending_msg_events()` (eg freeing the HTLC holding cell), which
 722                         /// provides potentially more coverage.
 723                         OnePendingMessage,
 724                 }
 725
 726                 macro_rules! process_msg_events {
 727                         ($node: expr, $corrupt_forward: expr, $limit_events: expr) => { {
 728                                 let mut events = if $node == 1 {
 729                                         let mut new_events = Vec::new();
 730                                         mem::swap(&mut new_events, &mut ba_events);
 731                                         new_events.extend_from_slice(&bc_events[..]);
 732                                         bc_events.clear();
 733                                         new_events
 734                                 } else if $node == 0 {
 735                                         let mut new_events = Vec::new();
 736                                         mem::swap(&mut new_events, &mut ab_events);
 737                                         new_events
 738                                 } else {
 739                                         let mut new_events = Vec::new();
 740                                         mem::swap(&mut new_events, &mut cb_events);
 741                                         new_events
 742                                 };
 743                                 let mut new_events = Vec::new();
 744                                 if $limit_events != ProcessMessages::OnePendingMessage {
 745                                         new_events = nodes[$node].get_and_clear_pending_msg_events();
 746                                 }
 747                                 let mut had_events = false;
 748                                 let mut events_iter = events.drain(..).chain(new_events.drain(..));
 749                                 let mut extra_ev = None;
 750                                 for event in &mut events_iter {
 751                                         had_events = true;
 752                                         match event {
 753                                                 events::MessageSendEvent::UpdateHTLCs { node_id, updates: CommitmentUpdate { update_add_htlcs, update_fail_htlcs, update_fulfill_htlcs, update_fail_malformed_htlcs, update_fee, commitment_signed } } => {
 754                                                         for (idx, dest) in nodes.iter().enumerate() {
 755                                                                 if dest.get_our_node_id() == node_id {
 756                                                                         for update_add in update_add_htlcs.iter() {
 757                                                                                 out.locked_write(format!("Delivering update_add_htlc to node {}.\n", idx).as_bytes());
 758                                                                                 if !$corrupt_forward {
 759                                                                                         dest.handle_update_add_htlc(&nodes[$node].get_our_node_id(), update_add);
 760                                                                                 } else {
 761                                                                                         // Corrupt the update_add_htlc message so that its HMAC
 762                                                                                         // check will fail and we generate a
 763                                                                                         // update_fail_malformed_htlc instead of an
 764                                                                                         // update_fail_htlc as we do when we reject a payment.
 765                                                                                         let mut msg_ser = update_add.encode();
 766                                                                                         msg_ser[1000] ^= 0xff;
 767                                                                                         let new_msg = UpdateAddHTLC::read(&mut Cursor::new(&msg_ser)).unwrap();
 768                                                                                         dest.handle_update_add_htlc(&nodes[$node].get_our_node_id(), &new_msg);
 769                                                                                 }
 770                                                                         }
 771                                                                         for update_fulfill in update_fulfill_htlcs.iter() {
 772                                                                                 out.locked_write(format!("Delivering update_fulfill_htlc to node {}.\n", idx).as_bytes());
 773                                                                                 dest.handle_update_fulfill_htlc(&nodes[$node].get_our_node_id(), update_fulfill);
 774                                                                         }
 775                                                                         for update_fail in update_fail_htlcs.iter() {
 776                                                                                 out.locked_write(format!("Delivering update_fail_htlc to node {}.\n", idx).as_bytes());
 777                                                                                 dest.handle_update_fail_htlc(&nodes[$node].get_our_node_id(), update_fail);
 778                                                                         }
 779                                                                         for update_fail_malformed in update_fail_malformed_htlcs.iter() {
 780                                                                                 out.locked_write(format!("Delivering update_fail_malformed_htlc to node {}.\n", idx).as_bytes());
 781                                                                                 dest.handle_update_fail_malformed_htlc(&nodes[$node].get_our_node_id(), update_fail_malformed);
 782                                                                         }
 783                                                                         if let Some(msg) = update_fee {
 784                                                                                 out.locked_write(format!("Delivering update_fee to node {}.\n", idx).as_bytes());
 785                                                                                 dest.handle_update_fee(&nodes[$node].get_our_node_id(), &msg);
 786                                                                         }
 787                                                                         let processed_change = !update_add_htlcs.is_empty() || !update_fulfill_htlcs.is_empty() ||
 788                                                                                 !update_fail_htlcs.is_empty() || !update_fail_malformed_htlcs.is_empty();
 789                                                                         if $limit_events != ProcessMessages::AllMessages && processed_change {
 790                                                                                 // If we only want to process some messages, don't deliver the CS until later.
 791                                                                                 extra_ev = Some(events::MessageSendEvent::UpdateHTLCs { node_id, updates: CommitmentUpdate {
 792                                                                                         update_add_htlcs: Vec::new(),
 793                                                                                         update_fail_htlcs: Vec::new(),
 794                                                                                         update_fulfill_htlcs: Vec::new(),
 795                                                                                         update_fail_malformed_htlcs: Vec::new(),
 796                                                                                         update_fee: None,
 797                                                                                         commitment_signed
 798                                                                                 } });
 799                                                                                 break;
 800                                                                         }
 801                                                                         out.locked_write(format!("Delivering commitment_signed to node {}.\n", idx).as_bytes());
 802                                                                         dest.handle_commitment_signed(&nodes[$node].get_our_node_id(), &commitment_signed);
 803                                                                         break;
 804                                                                 }
 805                                                         }
 806                                                 },
 807                                                 events::MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
 808                                                         for (idx, dest) in nodes.iter().enumerate() {
 809                                                                 if dest.get_our_node_id() == *node_id {
 810                                                                         out.locked_write(format!("Delivering revoke_and_ack to node {}.\n", idx).as_bytes());
 811                                                                         dest.handle_revoke_and_ack(&nodes[$node].get_our_node_id(), msg);
 812                                                                 }
 813                                                         }
 814                                                 },
 815                                                 events::MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
 816                                                         for (idx, dest) in nodes.iter().enumerate() {
 817                                                                 if dest.get_our_node_id() == *node_id {
 818                                                                         out.locked_write(format!("Delivering channel_reestablish to node {}.\n", idx).as_bytes());
 819                                                                         dest.handle_channel_reestablish(&nodes[$node].get_our_node_id(), msg);
 820                                                                 }
 821                                                         }
 822                                                 },
 823                                                 events::MessageSendEvent::SendChannelReady { .. } => {
 824                                                         // Can be generated as a reestablish response
 825                                                 },
 826                                                 events::MessageSendEvent::SendAnnouncementSignatures { .. } => {
 827                                                         // Can be generated as a reestablish response
 828                                                 },
 829                                                 events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 830                                                         // When we reconnect we will resend a channel_update to make sure our
 831                                                         // counterparty has the latest parameters for receiving payments
 832                                                         // through us. We do, however, check that the message does not include
 833                                                         // the "disabled" bit, as we should never ever have a channel which is
 834                                                         // disabled when we send such an update (or it may indicate channel
 835                                                         // force-close which we should detect as an error).
 836                                                         assert_eq!(msg.contents.flags & 2, 0);
 837                                                 },
 838                                                 _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 839                                                         return;
 840                                                 } else {
 841                                                         panic!("Unhandled message event {:?}", event)
 842                                                 },
 843                                         }
 844                                         if $limit_events != ProcessMessages::AllMessages {
 845                                                 break;
 846                                         }
 847                                 }
 848                                 if $node == 1 {
 849                                         push_excess_b_events!(extra_ev.into_iter().chain(events_iter), None);
 850                                 } else if $node == 0 {
 851                                         if let Some(ev) = extra_ev { ab_events.push(ev); }
 852                                         for event in events_iter { ab_events.push(event); }
 853                                 } else {
 854                                         if let Some(ev) = extra_ev { cb_events.push(ev); }
 855                                         for event in events_iter { cb_events.push(event); }
 856                                 }
 857                                 had_events
 858                         } }
 859                 }
 860
 861                 macro_rules! drain_msg_events_on_disconnect {
 862                         ($counterparty_id: expr) => { {
 863                                 if $counterparty_id == 0 {
 864                                         for event in nodes[0].get_and_clear_pending_msg_events() {
 865                                                 match event {
 866                                                         events::MessageSendEvent::UpdateHTLCs { .. } => {},
 867                                                         events::MessageSendEvent::SendRevokeAndACK { .. } => {},
 868                                                         events::MessageSendEvent::SendChannelReestablish { .. } => {},
 869                                                         events::MessageSendEvent::SendChannelReady { .. } => {},
 870                                                         events::MessageSendEvent::SendAnnouncementSignatures { .. } => {},
 871                                                         events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 872                                                                 assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 873                                                         },
 874                                                         _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 875                                                                 return;
 876                                                         } else {
 877                                                                 panic!("Unhandled message event")
 878                                                         },
 879                                                 }
 880                                         }
 881                                         push_excess_b_events!(nodes[1].get_and_clear_pending_msg_events().drain(..), Some(0));
 882                                         ab_events.clear();
 883                                         ba_events.clear();
 884                                 } else {
 885                                         for event in nodes[2].get_and_clear_pending_msg_events() {
 886                                                 match event {
 887                                                         events::MessageSendEvent::UpdateHTLCs { .. } => {},
 888                                                         events::MessageSendEvent::SendRevokeAndACK { .. } => {},
 889                                                         events::MessageSendEvent::SendChannelReestablish { .. } => {},
 890                                                         events::MessageSendEvent::SendChannelReady { .. } => {},
 891                                                         events::MessageSendEvent::SendAnnouncementSignatures { .. } => {},
 892                                                         events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 893                                                                 assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 894                                                         },
 895                                                         _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 896                                                                 return;
 897                                                         } else {
 898                                                                 panic!("Unhandled message event")
 899                                                         },
 900                                                 }
 901                                         }
 902                                         push_excess_b_events!(nodes[1].get_and_clear_pending_msg_events().drain(..), Some(2));
 903                                         bc_events.clear();
 904                                         cb_events.clear();
 905                                 }
 906                         } }
 907                 }
 908
 909                 macro_rules! process_events {
 910                         ($node: expr, $fail: expr) => { {
 911                                 // In case we get 256 payments we may have a hash collision, resulting in the
 912                                 // second claim/fail call not finding the duplicate-hash HTLC, so we have to
 913                                 // deduplicate the calls here.
 914                                 let mut claim_set = HashSet::new();
 915                                 let mut events = nodes[$node].get_and_clear_pending_events();
 916                                 // Sort events so that PendingHTLCsForwardable get processed last. This avoids a
 917                                 // case where we first process a PendingHTLCsForwardable, then claim/fail on a
 918                                 // PaymentClaimable, claiming/failing two HTLCs, but leaving a just-generated
 919                                 // PaymentClaimable event for the second HTLC in our pending_events (and breaking
 920                                 // our claim_set deduplication).
 921                                 events.sort_by(|a, b| {
 922                                         if let events::Event::PaymentClaimable { .. } = a {
 923                                                 if let events::Event::PendingHTLCsForwardable { .. } = b {
 924                                                         Ordering::Less
 925                                                 } else { Ordering::Equal }
 926                                         } else if let events::Event::PendingHTLCsForwardable { .. } = a {
 927                                                 if let events::Event::PaymentClaimable { .. } = b {
 928                                                         Ordering::Greater
 929                                                 } else { Ordering::Equal }
 930                                         } else { Ordering::Equal }
 931                                 });
 932                                 let had_events = !events.is_empty();
 933                                 for event in events.drain(..) {
 934                                         match event {
 935                                                 events::Event::PaymentClaimable { payment_hash, .. } => {
 936                                                         if claim_set.insert(payment_hash.0) {
 937                                                                 if $fail {
 938                                                                         nodes[$node].fail_htlc_backwards(&payment_hash);
 939                                                                 } else {
 940                                                                         nodes[$node].claim_funds(PaymentPreimage(payment_hash.0));
 941                                                                 }
 942                                                         }
 943                                                 },
 944                                                 events::Event::PaymentSent { .. } => {},
 945                                                 events::Event::PaymentClaimed { .. } => {},
 946                                                 events::Event::PaymentPathSuccessful { .. } => {},
 947                                                 events::Event::PaymentPathFailed { .. } => {},
 948                                                 events::Event::PaymentFailed { .. } => {},
 949                                                 events::Event::ProbeSuccessful { .. } | events::Event::ProbeFailed { .. } => {
 950                                                         // Even though we don't explicitly send probes, because probes are
 951                                                         // detected based on hashing the payment hash+preimage, its rather
 952                                                         // trivial for the fuzzer to build payments that accidentally end up
 953                                                         // looking like probes.
 954                                                 },
 955                                                 events::Event::PaymentForwarded { .. } if $node == 1 => {},
 956                                                 events::Event::ChannelReady { .. } => {},
 957                                                 events::Event::PendingHTLCsForwardable { .. } => {
 958                                                         nodes[$node].process_pending_htlc_forwards();
 959                                                 },
 960                                                 events::Event::HTLCHandlingFailed { .. } => {},
 961                                                 _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 962                                                         return;
 963                                                 } else {
 964                                                         panic!("Unhandled event")
 965                                                 },
 966                                         }
 967                                 }
 968                                 had_events
 969                         } }
 970                 }
 971
 972                 let v = get_slice!(1)[0];
 973                 out.locked_write(format!("READ A BYTE! HANDLING INPUT {:x}...........\n", v).as_bytes());
 974                 match v {
 975                         // In general, we keep related message groups close together in binary form, allowing
 976                         // bit-twiddling mutations to have similar effects. This is probably overkill, but no
 977                         // harm in doing so.
 978
 979                         0x00 => *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
 980                         0x01 => *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
 981                         0x02 => *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
 982                         0x04 => *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
 983                         0x05 => *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
 984                         0x06 => *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
 985
 986                         0x08 => {
 987                                 if let Some((id, _)) = monitor_a.latest_monitors.lock().unwrap().get(&chan_1_funding) {
 988                                         monitor_a.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
 989                                         nodes[0].process_monitor_events();
 990                                 }
 991                         },
 992                         0x09 => {
 993                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_1_funding) {
 994                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
 995                                         nodes[1].process_monitor_events();
 996                                 }
 997                         },
 998                         0x0a => {
 999                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1000                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1001                                         nodes[1].process_monitor_events();
1002                                 }
1003                         },
1004                         0x0b => {
1005                                 if let Some((id, _)) = monitor_c.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1006                                         monitor_c.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1007                                         nodes[2].process_monitor_events();
1008                                 }
1009                         },
1010
1011                         0x0c => {
1012                                 if !chan_a_disconnected {
1013                                         nodes[0].peer_disconnected(&nodes[1].get_our_node_id());
1014                                         nodes[1].peer_disconnected(&nodes[0].get_our_node_id());
1015                                         chan_a_disconnected = true;
1016                                         drain_msg_events_on_disconnect!(0);
1017                                 }
1018                         },
1019                         0x0d => {
1020                                 if !chan_b_disconnected {
1021                                         nodes[1].peer_disconnected(&nodes[2].get_our_node_id());
1022                                         nodes[2].peer_disconnected(&nodes[1].get_our_node_id());
1023                                         chan_b_disconnected = true;
1024                                         drain_msg_events_on_disconnect!(2);
1025                                 }
1026                         },
1027                         0x0e => {
1028                                 if chan_a_disconnected {
1029                                         nodes[0].peer_connected(&nodes[1].get_our_node_id(), &Init { features: nodes[1].init_features(), remote_network_address: None }, true).unwrap();
1030                                         nodes[1].peer_connected(&nodes[0].get_our_node_id(), &Init { features: nodes[0].init_features(), remote_network_address: None }, false).unwrap();
1031                                         chan_a_disconnected = false;
1032                                 }
1033                         },
1034                         0x0f => {
1035                                 if chan_b_disconnected {
1036                                         nodes[1].peer_connected(&nodes[2].get_our_node_id(), &Init { features: nodes[2].init_features(), remote_network_address: None }, true).unwrap();
1037                                         nodes[2].peer_connected(&nodes[1].get_our_node_id(), &Init { features: nodes[1].init_features(), remote_network_address: None }, false).unwrap();
1038                                         chan_b_disconnected = false;
1039                                 }
1040                         },
1041
1042                         0x10 => { process_msg_events!(0, true, ProcessMessages::AllMessages); },
1043                         0x11 => { process_msg_events!(0, false, ProcessMessages::AllMessages); },
1044                         0x12 => { process_msg_events!(0, true, ProcessMessages::OneMessage); },
1045                         0x13 => { process_msg_events!(0, false, ProcessMessages::OneMessage); },
1046                         0x14 => { process_msg_events!(0, true, ProcessMessages::OnePendingMessage); },
1047                         0x15 => { process_msg_events!(0, false, ProcessMessages::OnePendingMessage); },
1048
1049                         0x16 => { process_events!(0, true); },
1050                         0x17 => { process_events!(0, false); },
1051
1052                         0x18 => { process_msg_events!(1, true, ProcessMessages::AllMessages); },
1053                         0x19 => { process_msg_events!(1, false, ProcessMessages::AllMessages); },
1054                         0x1a => { process_msg_events!(1, true, ProcessMessages::OneMessage); },
1055                         0x1b => { process_msg_events!(1, false, ProcessMessages::OneMessage); },
1056                         0x1c => { process_msg_events!(1, true, ProcessMessages::OnePendingMessage); },
1057                         0x1d => { process_msg_events!(1, false, ProcessMessages::OnePendingMessage); },
1058
1059                         0x1e => { process_events!(1, true); },
1060                         0x1f => { process_events!(1, false); },
1061
1062                         0x20 => { process_msg_events!(2, true, ProcessMessages::AllMessages); },
1063                         0x21 => { process_msg_events!(2, false, ProcessMessages::AllMessages); },
1064                         0x22 => { process_msg_events!(2, true, ProcessMessages::OneMessage); },
1065                         0x23 => { process_msg_events!(2, false, ProcessMessages::OneMessage); },
1066                         0x24 => { process_msg_events!(2, true, ProcessMessages::OnePendingMessage); },
1067                         0x25 => { process_msg_events!(2, false, ProcessMessages::OnePendingMessage); },
1068
1069                         0x26 => { process_events!(2, true); },
1070                         0x27 => { process_events!(2, false); },
1071
1072                         0x2c => {
1073                                 if !chan_a_disconnected {
1074                                         nodes[1].peer_disconnected(&nodes[0].get_our_node_id());
1075                                         chan_a_disconnected = true;
1076                                         drain_msg_events_on_disconnect!(0);
1077                                 }
1078                                 if monitor_a.should_update_manager.load(atomic::Ordering::Relaxed) {
1079                                         node_a_ser.0.clear();
1080                                         nodes[0].write(&mut node_a_ser).unwrap();
1081                                 }
1082                                 let (new_node_a, new_monitor_a) = reload_node!(node_a_ser, 0, monitor_a, keys_manager_a, fee_est_a);
1083                                 nodes[0] = new_node_a;
1084                                 monitor_a = new_monitor_a;
1085                         },
1086                         0x2d => {
1087                                 if !chan_a_disconnected {
1088                                         nodes[0].peer_disconnected(&nodes[1].get_our_node_id());
1089                                         chan_a_disconnected = true;
1090                                         nodes[0].get_and_clear_pending_msg_events();
1091                                         ab_events.clear();
1092                                         ba_events.clear();
1093                                 }
1094                                 if !chan_b_disconnected {
1095                                         nodes[2].peer_disconnected(&nodes[1].get_our_node_id());
1096                                         chan_b_disconnected = true;
1097                                         nodes[2].get_and_clear_pending_msg_events();
1098                                         bc_events.clear();
1099                                         cb_events.clear();
1100                                 }
1101                                 let (new_node_b, new_monitor_b) = reload_node!(node_b_ser, 1, monitor_b, keys_manager_b, fee_est_b);
1102                                 nodes[1] = new_node_b;
1103                                 monitor_b = new_monitor_b;
1104                         },
1105                         0x2e => {
1106                                 if !chan_b_disconnected {
1107                                         nodes[1].peer_disconnected(&nodes[2].get_our_node_id());
1108                                         chan_b_disconnected = true;
1109                                         drain_msg_events_on_disconnect!(2);
1110                                 }
1111                                 if monitor_c.should_update_manager.load(atomic::Ordering::Relaxed) {
1112                                         node_c_ser.0.clear();
1113                                         nodes[2].write(&mut node_c_ser).unwrap();
1114                                 }
1115                                 let (new_node_c, new_monitor_c) = reload_node!(node_c_ser, 2, monitor_c, keys_manager_c, fee_est_c);
1116                                 nodes[2] = new_node_c;
1117                                 monitor_c = new_monitor_c;
1118                         },
1119
1120                         // 1/10th the channel size:
1121                         0x30 => { send_payment(&nodes[0], &nodes[1], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1122                         0x31 => { send_payment(&nodes[1], &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1123                         0x32 => { send_payment(&nodes[1], &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1124                         0x33 => { send_payment(&nodes[2], &nodes[1], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1125                         0x34 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1126                         0x35 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1127
1128                         0x38 => { send_payment(&nodes[0], &nodes[1], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1129                         0x39 => { send_payment(&nodes[1], &nodes[0], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1130                         0x3a => { send_payment(&nodes[1], &nodes[2], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1131                         0x3b => { send_payment(&nodes[2], &nodes[1], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1132                         0x3c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1133                         0x3d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1134
1135                         0x40 => { send_payment(&nodes[0], &nodes[1], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1136                         0x41 => { send_payment(&nodes[1], &nodes[0], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1137                         0x42 => { send_payment(&nodes[1], &nodes[2], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1138                         0x43 => { send_payment(&nodes[2], &nodes[1], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1139                         0x44 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1140                         0x45 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1141
1142                         0x48 => { send_payment(&nodes[0], &nodes[1], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1143                         0x49 => { send_payment(&nodes[1], &nodes[0], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1144                         0x4a => { send_payment(&nodes[1], &nodes[2], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1145                         0x4b => { send_payment(&nodes[2], &nodes[1], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1146                         0x4c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1147                         0x4d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1148
1149                         0x50 => { send_payment(&nodes[0], &nodes[1], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1150                         0x51 => { send_payment(&nodes[1], &nodes[0], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1151                         0x52 => { send_payment(&nodes[1], &nodes[2], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1152                         0x53 => { send_payment(&nodes[2], &nodes[1], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1153                         0x54 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1154                         0x55 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1155
1156                         0x58 => { send_payment(&nodes[0], &nodes[1], chan_a, 100, &mut payment_id, &mut payment_idx); },
1157                         0x59 => { send_payment(&nodes[1], &nodes[0], chan_a, 100, &mut payment_id, &mut payment_idx); },
1158                         0x5a => { send_payment(&nodes[1], &nodes[2], chan_b, 100, &mut payment_id, &mut payment_idx); },
1159                         0x5b => { send_payment(&nodes[2], &nodes[1], chan_b, 100, &mut payment_id, &mut payment_idx); },
1160                         0x5c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 100, &mut payment_id, &mut payment_idx); },
1161                         0x5d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 100, &mut payment_id, &mut payment_idx); },
1162
1163                         0x60 => { send_payment(&nodes[0], &nodes[1], chan_a, 10, &mut payment_id, &mut payment_idx); },
1164                         0x61 => { send_payment(&nodes[1], &nodes[0], chan_a, 10, &mut payment_id, &mut payment_idx); },
1165                         0x62 => { send_payment(&nodes[1], &nodes[2], chan_b, 10, &mut payment_id, &mut payment_idx); },
1166                         0x63 => { send_payment(&nodes[2], &nodes[1], chan_b, 10, &mut payment_id, &mut payment_idx); },
1167                         0x64 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10, &mut payment_id, &mut payment_idx); },
1168                         0x65 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10, &mut payment_id, &mut payment_idx); },
1169
1170                         0x68 => { send_payment(&nodes[0], &nodes[1], chan_a, 1, &mut payment_id, &mut payment_idx); },
1171                         0x69 => { send_payment(&nodes[1], &nodes[0], chan_a, 1, &mut payment_id, &mut payment_idx); },
1172                         0x6a => { send_payment(&nodes[1], &nodes[2], chan_b, 1, &mut payment_id, &mut payment_idx); },
1173                         0x6b => { send_payment(&nodes[2], &nodes[1], chan_b, 1, &mut payment_id, &mut payment_idx); },
1174                         0x6c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1, &mut payment_id, &mut payment_idx); },
1175                         0x6d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1, &mut payment_id, &mut payment_idx); },
1176
1177                         0x80 => {
1178                                 let max_feerate = last_htlc_clear_fee_a * FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1179                                 if fee_est_a.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1180                                         fee_est_a.ret_val.store(max_feerate, atomic::Ordering::Release);
1181                                 }
1182                                 nodes[0].maybe_update_chan_fees();
1183                         },
1184                         0x81 => { fee_est_a.ret_val.store(253, atomic::Ordering::Release); nodes[0].maybe_update_chan_fees(); },
1185
1186                         0x84 => {
1187                                 let max_feerate = last_htlc_clear_fee_b * FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1188                                 if fee_est_b.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1189                                         fee_est_b.ret_val.store(max_feerate, atomic::Ordering::Release);
1190                                 }
1191                                 nodes[1].maybe_update_chan_fees();
1192                         },
1193                         0x85 => { fee_est_b.ret_val.store(253, atomic::Ordering::Release); nodes[1].maybe_update_chan_fees(); },
1194
1195                         0x88 => {
1196                                 let max_feerate = last_htlc_clear_fee_c * FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1197                                 if fee_est_c.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1198                                         fee_est_c.ret_val.store(max_feerate, atomic::Ordering::Release);
1199                                 }
1200                                 nodes[2].maybe_update_chan_fees();
1201                         },
1202                         0x89 => { fee_est_c.ret_val.store(253, atomic::Ordering::Release); nodes[2].maybe_update_chan_fees(); },
1203
1204                         0xff => {
1205                                 // Test that no channel is in a stuck state where neither party can send funds even
1206                                 // after we resolve all pending events.
1207                                 // First make sure there are no pending monitor updates, resetting the error state
1208                                 // and calling force_channel_monitor_updated for each monitor.
1209                                 *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1210                                 *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1211                                 *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1212
1213                                 if let Some((id, _)) = monitor_a.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1214                                         monitor_a.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
1215                                         nodes[0].process_monitor_events();
1216                                 }
1217                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1218                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
1219                                         nodes[1].process_monitor_events();
1220                                 }
1221                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1222                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1223                                         nodes[1].process_monitor_events();
1224                                 }
1225                                 if let Some((id, _)) = monitor_c.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1226                                         monitor_c.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1227                                         nodes[2].process_monitor_events();
1228                                 }
1229
1230                                 // Next, make sure peers are all connected to each other
1231                                 if chan_a_disconnected {
1232                                         nodes[0].peer_connected(&nodes[1].get_our_node_id(), &Init { features: nodes[1].init_features(), remote_network_address: None }, true).unwrap();
1233                                         nodes[1].peer_connected(&nodes[0].get_our_node_id(), &Init { features: nodes[0].init_features(), remote_network_address: None }, false).unwrap();
1234                                         chan_a_disconnected = false;
1235                                 }
1236                                 if chan_b_disconnected {
1237                                         nodes[1].peer_connected(&nodes[2].get_our_node_id(), &Init { features: nodes[2].init_features(), remote_network_address: None }, true).unwrap();
1238                                         nodes[2].peer_connected(&nodes[1].get_our_node_id(), &Init { features: nodes[1].init_features(), remote_network_address: None }, false).unwrap();
1239                                         chan_b_disconnected = false;
1240                                 }
1241
1242                                 for i in 0..std::usize::MAX {
1243                                         if i == 100 { panic!("It may take may iterations to settle the state, but it should not take forever"); }
1244                                         // Then, make sure any current forwards make their way to their destination
1245                                         if process_msg_events!(0, false, ProcessMessages::AllMessages) { continue; }
1246                                         if process_msg_events!(1, false, ProcessMessages::AllMessages) { continue; }
1247                                         if process_msg_events!(2, false, ProcessMessages::AllMessages) { continue; }
1248                                         // ...making sure any pending PendingHTLCsForwardable events are handled and
1249                                         // payments claimed.
1250                                         if process_events!(0, false) { continue; }
1251                                         if process_events!(1, false) { continue; }
1252                                         if process_events!(2, false) { continue; }
1253                                         break;
1254                                 }
1255
1256                                 // Finally, make sure that at least one end of each channel can make a substantial payment
1257                                 assert!(
1258                                         send_payment(&nodes[0], &nodes[1], chan_a, 10_000_000, &mut payment_id, &mut payment_idx) ||
1259                                         send_payment(&nodes[1], &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx));
1260                                 assert!(
1261                                         send_payment(&nodes[1], &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx) ||
1262                                         send_payment(&nodes[2], &nodes[1], chan_b, 10_000_000, &mut payment_id, &mut payment_idx));
1263
1264                                 last_htlc_clear_fee_a = fee_est_a.ret_val.load(atomic::Ordering::Acquire);
1265                                 last_htlc_clear_fee_b = fee_est_b.ret_val.load(atomic::Ordering::Acquire);
1266                                 last_htlc_clear_fee_c = fee_est_c.ret_val.load(atomic::Ordering::Acquire);
1267                         },
1268                         _ => test_return!(),
1269                 }
1270
1271                 node_a_ser.0.clear();
1272                 nodes[0].write(&mut node_a_ser).unwrap();
1273                 monitor_a.should_update_manager.store(false, atomic::Ordering::Relaxed);
1274                 node_b_ser.0.clear();
1275                 nodes[1].write(&mut node_b_ser).unwrap();
1276                 monitor_b.should_update_manager.store(false, atomic::Ordering::Relaxed);
1277                 node_c_ser.0.clear();
1278                 nodes[2].write(&mut node_c_ser).unwrap();
1279                 monitor_c.should_update_manager.store(false, atomic::Ordering::Relaxed);
1280         }
1281 }
1282
1283 /// We actually have different behavior based on if a certain log string has been seen, so we have
1284 /// to do a bit more tracking.
1285 #[derive(Clone)]
1286 struct SearchingOutput<O: Output> {
1287         output: O,
1288         may_fail: Arc<atomic::AtomicBool>,
1289 }
1290 impl<O: Output> Output for SearchingOutput<O> {
1291         fn locked_write(&self, data: &[u8]) {
1292                 // We hit a design limitation of LN state machine (see CONCURRENT_INBOUND_HTLC_FEE_BUFFER)
1293                 if std::str::from_utf8(data).unwrap().contains("Outbound update_fee HTLC buffer overflow - counterparty should force-close this channel") {
1294                         self.may_fail.store(true, atomic::Ordering::Release);
1295                 }
1296                 self.output.locked_write(data)
1297         }
1298 }
1299 impl<O: Output> SearchingOutput<O> {
1300         pub fn new(output: O) -> Self {
1301                 Self { output, may_fail: Arc::new(atomic::AtomicBool::new(false)) }
1302         }
1303 }
1304
1305 pub fn chanmon_consistency_test<Out: Output>(data: &[u8], out: Out) {
1306         do_test(data, out);
1307 }
1308
1309 #[no_mangle]
1310 pub extern "C" fn chanmon_consistency_run(data: *const u8, datalen: usize) {
1311         do_test(unsafe { std::slice::from_raw_parts(data, datalen) }, test_logger::DevNull{});
1312 }