_ 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::offers::invoice::UnsignedBolt12Invoice;
  48 use lightning::offers::invoice_request::UnsignedInvoiceRequest;
  49 use lightning::util::test_channel_signer::{TestChannelSigner, EnforcementState};
  50 use lightning::util::errors::APIError;
  51 use lightning::util::logger::Logger;
  52 use lightning::util::config::UserConfig;
  53 use lightning::util::ser::{Readable, ReadableArgs, Writeable, Writer};
  54 use lightning::routing::router::{InFlightHtlcs, Path, Route, RouteHop, RouteParameters, Router};
  55
  56 use crate::utils::test_logger::{self, Output};
  57 use crate::utils::test_persister::TestPersister;
  58
  59 use bitcoin::secp256k1::{Message, PublicKey, SecretKey, Scalar, Secp256k1};
  60 use bitcoin::secp256k1::ecdh::SharedSecret;
  61 use bitcoin::secp256k1::ecdsa::{RecoverableSignature, Signature};
  62 use bitcoin::secp256k1::schnorr;
  63
  64 use std::mem;
  65 use std::cmp::{self, Ordering};
  66 use hashbrown::{HashSet, hash_map, HashMap};
  67 use std::sync::{Arc,Mutex};
  68 use std::sync::atomic;
  69 use std::io::Cursor;
  70 use bitcoin::bech32::u5;
  71
  72 const MAX_FEE: u32 = 10_000;
  73 struct FuzzEstimator {
  74         ret_val: atomic::AtomicU32,
  75 }
  76 impl FeeEstimator for FuzzEstimator {
  77         fn get_est_sat_per_1000_weight(&self, conf_target: ConfirmationTarget) -> u32 {
  78                 // We force-close channels if our counterparty sends us a feerate which is a small multiple
  79                 // of our HighPriority fee estimate or smaller than our Background fee estimate. Thus, we
  80                 // always return a HighPriority feerate here which is >= the maximum Normal feerate and a
  81                 // Background feerate which is <= the minimum Normal feerate.
  82                 match conf_target {
  83                         ConfirmationTarget::HighPriority => MAX_FEE,
  84                         ConfirmationTarget::Background|ConfirmationTarget::MempoolMinimum => 253,
  85                         ConfirmationTarget::Normal => cmp::min(self.ret_val.load(atomic::Ordering::Acquire), MAX_FEE),
  86                 }
  87         }
  88 }
  89
  90 struct FuzzRouter {}
  91
  92 impl Router for FuzzRouter {
  93         fn find_route(
  94                 &self, _payer: &PublicKey, _params: &RouteParameters, _first_hops: Option<&[&ChannelDetails]>,
  95                 _inflight_htlcs: InFlightHtlcs
  96         ) -> Result<Route, msgs::LightningError> {
  97                 Err(msgs::LightningError {
  98                         err: String::from("Not implemented"),
  99                         action: msgs::ErrorAction::IgnoreError
 100                 })
 101         }
 102 }
 103
 104 pub struct TestBroadcaster {}
 105 impl BroadcasterInterface for TestBroadcaster {
 106         fn broadcast_transactions(&self, _txs: &[&Transaction]) { }
 107 }
 108
 109 pub struct VecWriter(pub Vec<u8>);
 110 impl Writer for VecWriter {
 111         fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
 112                 self.0.extend_from_slice(buf);
 113                 Ok(())
 114         }
 115 }
 116
 117 struct TestChainMonitor {
 118         pub logger: Arc<dyn Logger>,
 119         pub keys: Arc<KeyProvider>,
 120         pub persister: Arc<TestPersister>,
 121         pub chain_monitor: Arc<chainmonitor::ChainMonitor<TestChannelSigner, Arc<dyn chain::Filter>, Arc<TestBroadcaster>, Arc<FuzzEstimator>, Arc<dyn Logger>, Arc<TestPersister>>>,
 122         // If we reload a node with an old copy of ChannelMonitors, the ChannelManager deserialization
 123         // logic will automatically force-close our channels for us (as we don't have an up-to-date
 124         // monitor implying we are not able to punish misbehaving counterparties). Because this test
 125         // "fails" if we ever force-close a channel, we avoid doing so, always saving the latest
 126         // fully-serialized monitor state here, as well as the corresponding update_id.
 127         pub latest_monitors: Mutex<HashMap<OutPoint, (u64, Vec<u8>)>>,
 128 }
 129 impl TestChainMonitor {
 130         pub fn new(broadcaster: Arc<TestBroadcaster>, logger: Arc<dyn Logger>, feeest: Arc<FuzzEstimator>, persister: Arc<TestPersister>, keys: Arc<KeyProvider>) -> Self {
 131                 Self {
 132                         chain_monitor: Arc::new(chainmonitor::ChainMonitor::new(None, broadcaster, logger.clone(), feeest, Arc::clone(&persister))),
 133                         logger,
 134                         keys,
 135                         persister,
 136                         latest_monitors: Mutex::new(HashMap::new()),
 137                 }
 138         }
 139 }
 140 impl chain::Watch<TestChannelSigner> for TestChainMonitor {
 141         fn watch_channel(&self, funding_txo: OutPoint, monitor: channelmonitor::ChannelMonitor<TestChannelSigner>) -> chain::ChannelMonitorUpdateStatus {
 142                 let mut ser = VecWriter(Vec::new());
 143                 monitor.write(&mut ser).unwrap();
 144                 if let Some(_) = self.latest_monitors.lock().unwrap().insert(funding_txo, (monitor.get_latest_update_id(), ser.0)) {
 145                         panic!("Already had monitor pre-watch_channel");
 146                 }
 147                 self.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<TestChannelSigner>)>::
 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.chain_monitor.update_channel(funding_txo, update)
 163         }
 164
 165         fn release_pending_monitor_events(&self) -> Vec<(OutPoint, Vec<MonitorEvent>, Option<PublicKey>)> {
 166                 return self.chain_monitor.release_pending_monitor_events();
 167         }
 168 }
 169
 170 struct KeyProvider {
 171         node_secret: SecretKey,
 172         rand_bytes_id: atomic::AtomicU32,
 173         enforcement_states: Mutex<HashMap<[u8;32], Arc<Mutex<EnforcementState>>>>,
 174 }
 175
 176 impl EntropySource for KeyProvider {
 177         fn get_secure_random_bytes(&self) -> [u8; 32] {
 178                 let id = self.rand_bytes_id.fetch_add(1, atomic::Ordering::Relaxed);
 179                 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]];
 180                 res[30-4..30].copy_from_slice(&id.to_le_bytes());
 181                 res
 182         }
 183 }
 184
 185 impl NodeSigner for KeyProvider {
 186         fn get_node_id(&self, recipient: Recipient) -> Result<PublicKey, ()> {
 187                 let node_secret = match recipient {
 188                         Recipient::Node => Ok(&self.node_secret),
 189                         Recipient::PhantomNode => Err(())
 190                 }?;
 191                 Ok(PublicKey::from_secret_key(&Secp256k1::signing_only(), node_secret))
 192         }
 193
 194         fn ecdh(&self, recipient: Recipient, other_key: &PublicKey, tweak: Option<&Scalar>) -> Result<SharedSecret, ()> {
 195                 let mut node_secret = match recipient {
 196                         Recipient::Node => Ok(self.node_secret.clone()),
 197                         Recipient::PhantomNode => Err(())
 198                 }?;
 199                 if let Some(tweak) = tweak {
 200                         node_secret = node_secret.mul_tweak(tweak).map_err(|_| ())?;
 201                 }
 202                 Ok(SharedSecret::new(other_key, &node_secret))
 203         }
 204
 205         fn get_inbound_payment_key_material(&self) -> KeyMaterial {
 206                 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]])
 207         }
 208
 209         fn sign_invoice(&self, _hrp_bytes: &[u8], _invoice_data: &[u5], _recipient: Recipient) -> Result<RecoverableSignature, ()> {
 210                 unreachable!()
 211         }
 212
 213         fn sign_bolt12_invoice_request(
 214                 &self, _invoice_request: &UnsignedInvoiceRequest
 215         ) -> Result<schnorr::Signature, ()> {
 216                 unreachable!()
 217         }
 218
 219         fn sign_bolt12_invoice(
 220                 &self, _invoice: &UnsignedBolt12Invoice,
 221         ) -> Result<schnorr::Signature, ()> {
 222                 unreachable!()
 223         }
 224
 225         fn sign_gossip_message(&self, msg: lightning::ln::msgs::UnsignedGossipMessage) -> Result<Signature, ()> {
 226                 let msg_hash = Message::from_slice(&Sha256dHash::hash(&msg.encode()[..])[..]).map_err(|_| ())?;
 227                 let secp_ctx = Secp256k1::signing_only();
 228                 Ok(secp_ctx.sign_ecdsa(&msg_hash, &self.node_secret))
 229         }
 230 }
 231
 232 impl SignerProvider for KeyProvider {
 233         type Signer = TestChannelSigner;
 234
 235         fn generate_channel_keys_id(&self, _inbound: bool, _channel_value_satoshis: u64, _user_channel_id: u128) -> [u8; 32] {
 236                 let id = self.rand_bytes_id.fetch_add(1, atomic::Ordering::Relaxed) as u8;
 237                 [id; 32]
 238         }
 239
 240         fn derive_channel_signer(&self, channel_value_satoshis: u64, channel_keys_id: [u8; 32]) -> Self::Signer {
 241                 let secp_ctx = Secp256k1::signing_only();
 242                 let id = channel_keys_id[0];
 243                 let keys = InMemorySigner::new(
 244                         &secp_ctx,
 245                         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(),
 246                         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(),
 247                         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(),
 248                         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(),
 249                         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(),
 250                         [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]],
 251                         channel_value_satoshis,
 252                         channel_keys_id,
 253                         channel_keys_id,
 254                 );
 255                 let revoked_commitment = self.make_enforcement_state_cell(keys.commitment_seed);
 256                 TestChannelSigner::new_with_revoked(keys, revoked_commitment, false)
 257         }
 258
 259         fn read_chan_signer(&self, buffer: &[u8]) -> Result<Self::Signer, DecodeError> {
 260                 let mut reader = std::io::Cursor::new(buffer);
 261
 262                 let inner: InMemorySigner = ReadableArgs::read(&mut reader, self)?;
 263                 let state = self.make_enforcement_state_cell(inner.commitment_seed);
 264
 265                 Ok(TestChannelSigner {
 266                         inner,
 267                         state,
 268                         disable_revocation_policy_check: false,
 269                 })
 270         }
 271
 272         fn get_destination_script(&self) -> Result<Script, ()> {
 273                 let secp_ctx = Secp256k1::signing_only();
 274                 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();
 275                 let our_channel_monitor_claim_key_hash = WPubkeyHash::hash(&PublicKey::from_secret_key(&secp_ctx, &channel_monitor_claim_key).serialize());
 276                 Ok(Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0).push_slice(&our_channel_monitor_claim_key_hash[..]).into_script())
 277         }
 278
 279         fn get_shutdown_scriptpubkey(&self) -> Result<ShutdownScript, ()> {
 280                 let secp_ctx = Secp256k1::signing_only();
 281                 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();
 282                 let pubkey_hash = WPubkeyHash::hash(&PublicKey::from_secret_key(&secp_ctx, &secret_key).serialize());
 283                 Ok(ShutdownScript::new_p2wpkh(&pubkey_hash))
 284         }
 285 }
 286
 287 impl KeyProvider {
 288         fn make_enforcement_state_cell(&self, commitment_seed: [u8; 32]) -> Arc<Mutex<EnforcementState>> {
 289                 let mut revoked_commitments = self.enforcement_states.lock().unwrap();
 290                 if !revoked_commitments.contains_key(&commitment_seed) {
 291                         revoked_commitments.insert(commitment_seed, Arc::new(Mutex::new(EnforcementState::new())));
 292                 }
 293                 let cell = revoked_commitments.get(&commitment_seed).unwrap();
 294                 Arc::clone(cell)
 295         }
 296 }
 297
 298 #[inline]
 299 fn check_api_err(api_err: APIError, sendable_bounds_violated: bool) {
 300         match api_err {
 301                 APIError::APIMisuseError { .. } => panic!("We can't misuse the API"),
 302                 APIError::FeeRateTooHigh { .. } => panic!("We can't send too much fee?"),
 303                 APIError::InvalidRoute { .. } => panic!("Our routes should work"),
 304                 APIError::ChannelUnavailable { err } => {
 305                         // Test the error against a list of errors we can hit, and reject
 306                         // all others. If you hit this panic, the list of acceptable errors
 307                         // is probably just stale and you should add new messages here.
 308                         match err.as_str() {
 309                                 "Peer for first hop currently disconnected" => {},
 310                                 _ if err.starts_with("Cannot send less than our next-HTLC minimum - ") => {},
 311                                 _ if err.starts_with("Cannot send more than our next-HTLC maximum - ") => {},
 312                                 _ => panic!("{}", err),
 313                         }
 314                         assert!(sendable_bounds_violated);
 315                 },
 316                 APIError::MonitorUpdateInProgress => {
 317                         // We can (obviously) temp-fail a monitor update
 318                 },
 319                 APIError::IncompatibleShutdownScript { .. } => panic!("Cannot send an incompatible shutdown script"),
 320         }
 321 }
 322 #[inline]
 323 fn check_payment_err(send_err: PaymentSendFailure, sendable_bounds_violated: bool) {
 324         match send_err {
 325                 PaymentSendFailure::ParameterError(api_err) => check_api_err(api_err, sendable_bounds_violated),
 326                 PaymentSendFailure::PathParameterError(per_path_results) => {
 327                         for res in per_path_results { if let Err(api_err) = res { check_api_err(api_err, sendable_bounds_violated); } }
 328                 },
 329                 PaymentSendFailure::AllFailedResendSafe(per_path_results) => {
 330                         for api_err in per_path_results { check_api_err(api_err, sendable_bounds_violated); }
 331                 },
 332                 PaymentSendFailure::PartialFailure { results, .. } => {
 333                         for res in results { if let Err(api_err) = res { check_api_err(api_err, sendable_bounds_violated); } }
 334                 },
 335                 PaymentSendFailure::DuplicatePayment => panic!(),
 336         }
 337 }
 338
 339 type ChanMan<'a> = ChannelManager<Arc<TestChainMonitor>, Arc<TestBroadcaster>, Arc<KeyProvider>, Arc<KeyProvider>, Arc<KeyProvider>, Arc<FuzzEstimator>, &'a FuzzRouter, Arc<dyn Logger>>;
 340
 341 #[inline]
 342 fn get_payment_secret_hash(dest: &ChanMan, payment_id: &mut u8) -> Option<(PaymentSecret, PaymentHash)> {
 343         let mut payment_hash;
 344         for _ in 0..256 {
 345                 payment_hash = PaymentHash(Sha256::hash(&[*payment_id; 1]).into_inner());
 346                 if let Ok(payment_secret) = dest.create_inbound_payment_for_hash(payment_hash, None, 3600, None) {
 347                         return Some((payment_secret, payment_hash));
 348                 }
 349                 *payment_id = payment_id.wrapping_add(1);
 350         }
 351         None
 352 }
 353
 354 #[inline]
 355 fn send_payment(source: &ChanMan, dest: &ChanMan, dest_chan_id: u64, amt: u64, payment_id: &mut u8, payment_idx: &mut u64) -> bool {
 356         let (payment_secret, payment_hash) =
 357                 if let Some((secret, hash)) = get_payment_secret_hash(dest, payment_id) { (secret, hash) } else { return true; };
 358         let mut payment_id = [0; 32];
 359         payment_id[0..8].copy_from_slice(&payment_idx.to_ne_bytes());
 360         *payment_idx += 1;
 361         let (min_value_sendable, max_value_sendable) = source.list_usable_channels()
 362                 .iter().find(|chan| chan.short_channel_id == Some(dest_chan_id))
 363                 .map(|chan|
 364                         (chan.next_outbound_htlc_minimum_msat, chan.next_outbound_htlc_limit_msat))
 365                 .unwrap_or((0, 0));
 366         if let Err(err) = source.send_payment_with_route(&Route {
 367                 paths: vec![Path { hops: vec![RouteHop {
 368                         pubkey: dest.get_our_node_id(),
 369                         node_features: dest.node_features(),
 370                         short_channel_id: dest_chan_id,
 371                         channel_features: dest.channel_features(),
 372                         fee_msat: amt,
 373                         cltv_expiry_delta: 200,
 374                 }], blinded_tail: None }],
 375                 route_params: None,
 376         }, payment_hash, RecipientOnionFields::secret_only(payment_secret), PaymentId(payment_id)) {
 377                 check_payment_err(err, amt > max_value_sendable || amt < min_value_sendable);
 378                 false
 379         } else {
 380                 // Note that while the max is a strict upper-bound, we can occasionally send substantially
 381                 // below the minimum, with some gap which is unusable immediately below the minimum. Thus,
 382                 // we don't check against min_value_sendable here.
 383                 assert!(amt <= max_value_sendable);
 384                 true
 385         }
 386 }
 387 #[inline]
 388 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 {
 389         let (payment_secret, payment_hash) =
 390                 if let Some((secret, hash)) = get_payment_secret_hash(dest, payment_id) { (secret, hash) } else { return true; };
 391         let mut payment_id = [0; 32];
 392         payment_id[0..8].copy_from_slice(&payment_idx.to_ne_bytes());
 393         *payment_idx += 1;
 394         let (min_value_sendable, max_value_sendable) = source.list_usable_channels()
 395                 .iter().find(|chan| chan.short_channel_id == Some(middle_chan_id))
 396                 .map(|chan|
 397                         (chan.next_outbound_htlc_minimum_msat, chan.next_outbound_htlc_limit_msat))
 398                 .unwrap_or((0, 0));
 399         let first_hop_fee = 50_000;
 400         if let Err(err) = source.send_payment_with_route(&Route {
 401                 paths: vec![Path { hops: vec![RouteHop {
 402                         pubkey: middle.get_our_node_id(),
 403                         node_features: middle.node_features(),
 404                         short_channel_id: middle_chan_id,
 405                         channel_features: middle.channel_features(),
 406                         fee_msat: first_hop_fee,
 407                         cltv_expiry_delta: 100,
 408                 }, RouteHop {
 409                         pubkey: dest.get_our_node_id(),
 410                         node_features: dest.node_features(),
 411                         short_channel_id: dest_chan_id,
 412                         channel_features: dest.channel_features(),
 413                         fee_msat: amt,
 414                         cltv_expiry_delta: 200,
 415                 }], blinded_tail: None }],
 416                 route_params: None,
 417         }, payment_hash, RecipientOnionFields::secret_only(payment_secret), PaymentId(payment_id)) {
 418                 let sent_amt = amt + first_hop_fee;
 419                 check_payment_err(err, sent_amt < min_value_sendable || sent_amt > max_value_sendable);
 420                 false
 421         } else {
 422                 // Note that while the max is a strict upper-bound, we can occasionally send substantially
 423                 // below the minimum, with some gap which is unusable immediately below the minimum. Thus,
 424                 // we don't check against min_value_sendable here.
 425                 assert!(amt + first_hop_fee <= max_value_sendable);
 426                 true
 427         }
 428 }
 429
 430 #[inline]
 431 pub fn do_test<Out: Output>(data: &[u8], underlying_out: Out) {
 432         let out = SearchingOutput::new(underlying_out);
 433         let broadcast = Arc::new(TestBroadcaster{});
 434         let router = FuzzRouter {};
 435
 436         macro_rules! make_node {
 437                 ($node_id: expr, $fee_estimator: expr) => { {
 438                         let logger: Arc<dyn Logger> = Arc::new(test_logger::TestLogger::new($node_id.to_string(), out.clone()));
 439                         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();
 440                         let keys_manager = Arc::new(KeyProvider { node_secret, rand_bytes_id: atomic::AtomicU32::new(0), enforcement_states: Mutex::new(HashMap::new()) });
 441                         let monitor = Arc::new(TestChainMonitor::new(broadcast.clone(), logger.clone(), $fee_estimator.clone(),
 442                                 Arc::new(TestPersister {
 443                                         update_ret: Mutex::new(ChannelMonitorUpdateStatus::Completed)
 444                                 }), Arc::clone(&keys_manager)));
 445
 446                         let mut config = UserConfig::default();
 447                         config.channel_config.forwarding_fee_proportional_millionths = 0;
 448                         config.channel_handshake_config.announced_channel = true;
 449                         let network = Network::Bitcoin;
 450                         let best_block_timestamp = genesis_block(network).header.time;
 451                         let params = ChainParameters {
 452                                 network,
 453                                 best_block: BestBlock::from_network(network),
 454                         };
 455                         (ChannelManager::new($fee_estimator.clone(), monitor.clone(), broadcast.clone(), &router, Arc::clone(&logger), keys_manager.clone(), keys_manager.clone(), keys_manager.clone(), config, params, best_block_timestamp),
 456                         monitor, keys_manager)
 457                 } }
 458         }
 459
 460         macro_rules! reload_node {
 461                 ($ser: expr, $node_id: expr, $old_monitors: expr, $keys_manager: expr, $fee_estimator: expr) => { {
 462                     let keys_manager = Arc::clone(& $keys_manager);
 463                         let logger: Arc<dyn Logger> = Arc::new(test_logger::TestLogger::new($node_id.to_string(), out.clone()));
 464                         let chain_monitor = Arc::new(TestChainMonitor::new(broadcast.clone(), logger.clone(), $fee_estimator.clone(),
 465                                 Arc::new(TestPersister {
 466                                         update_ret: Mutex::new(ChannelMonitorUpdateStatus::Completed)
 467                                 }), Arc::clone(& $keys_manager)));
 468
 469                         let mut config = UserConfig::default();
 470                         config.channel_config.forwarding_fee_proportional_millionths = 0;
 471                         config.channel_handshake_config.announced_channel = true;
 472
 473                         let mut monitors = HashMap::new();
 474                         let mut old_monitors = $old_monitors.latest_monitors.lock().unwrap();
 475                         for (outpoint, (update_id, monitor_ser)) in old_monitors.drain() {
 476                                 monitors.insert(outpoint, <(BlockHash, ChannelMonitor<TestChannelSigner>)>::read(&mut Cursor::new(&monitor_ser), (&*$keys_manager, &*$keys_manager)).expect("Failed to read monitor").1);
 477                                 chain_monitor.latest_monitors.lock().unwrap().insert(outpoint, (update_id, monitor_ser));
 478                         }
 479                         let mut monitor_refs = HashMap::new();
 480                         for (outpoint, monitor) in monitors.iter_mut() {
 481                                 monitor_refs.insert(*outpoint, monitor);
 482                         }
 483
 484                         let read_args = ChannelManagerReadArgs {
 485                                 entropy_source: keys_manager.clone(),
 486                                 node_signer: keys_manager.clone(),
 487                                 signer_provider: keys_manager.clone(),
 488                                 fee_estimator: $fee_estimator.clone(),
 489                                 chain_monitor: chain_monitor.clone(),
 490                                 tx_broadcaster: broadcast.clone(),
 491                                 router: &router,
 492                                 logger,
 493                                 default_config: config,
 494                                 channel_monitors: monitor_refs,
 495                         };
 496
 497                         let res = (<(BlockHash, ChanMan)>::read(&mut Cursor::new(&$ser.0), read_args).expect("Failed to read manager").1, chain_monitor.clone());
 498                         for (funding_txo, mon) in monitors.drain() {
 499                                 assert_eq!(chain_monitor.chain_monitor.watch_channel(funding_txo, mon),
 500                                         ChannelMonitorUpdateStatus::Completed);
 501                         }
 502                         res
 503                 } }
 504         }
 505
 506         let mut channel_txn = Vec::new();
 507         macro_rules! make_channel {
 508                 ($source: expr, $dest: expr, $chan_id: expr) => { {
 509                         $source.peer_connected(&$dest.get_our_node_id(), &Init {
 510                                 features: $dest.init_features(), networks: None, remote_network_address: None
 511                         }, true).unwrap();
 512                         $dest.peer_connected(&$source.get_our_node_id(), &Init {
 513                                 features: $source.init_features(), networks: None, remote_network_address: None
 514                         }, false).unwrap();
 515
 516                         $source.create_channel($dest.get_our_node_id(), 100_000, 42, 0, None).unwrap();
 517                         let open_channel = {
 518                                 let events = $source.get_and_clear_pending_msg_events();
 519                                 assert_eq!(events.len(), 1);
 520                                 if let events::MessageSendEvent::SendOpenChannel { ref msg, .. } = events[0] {
 521                                         msg.clone()
 522                                 } else { panic!("Wrong event type"); }
 523                         };
 524
 525                         $dest.handle_open_channel(&$source.get_our_node_id(), &open_channel);
 526                         let accept_channel = {
 527                                 let events = $dest.get_and_clear_pending_msg_events();
 528                                 assert_eq!(events.len(), 1);
 529                                 if let events::MessageSendEvent::SendAcceptChannel { ref msg, .. } = events[0] {
 530                                         msg.clone()
 531                                 } else { panic!("Wrong event type"); }
 532                         };
 533
 534                         $source.handle_accept_channel(&$dest.get_our_node_id(), &accept_channel);
 535                         let funding_output;
 536                         {
 537                                 let events = $source.get_and_clear_pending_events();
 538                                 assert_eq!(events.len(), 1);
 539                                 if let events::Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, .. } = events[0] {
 540                                         let tx = Transaction { version: $chan_id, lock_time: PackedLockTime::ZERO, input: Vec::new(), output: vec![TxOut {
 541                                                 value: *channel_value_satoshis, script_pubkey: output_script.clone(),
 542                                         }]};
 543                                         funding_output = OutPoint { txid: tx.txid(), index: 0 };
 544                                         $source.funding_transaction_generated(&temporary_channel_id, &$dest.get_our_node_id(), tx.clone()).unwrap();
 545                                         channel_txn.push(tx);
 546                                 } else { panic!("Wrong event type"); }
 547                         }
 548
 549                         let funding_created = {
 550                                 let events = $source.get_and_clear_pending_msg_events();
 551                                 assert_eq!(events.len(), 1);
 552                                 if let events::MessageSendEvent::SendFundingCreated { ref msg, .. } = events[0] {
 553                                         msg.clone()
 554                                 } else { panic!("Wrong event type"); }
 555                         };
 556                         $dest.handle_funding_created(&$source.get_our_node_id(), &funding_created);
 557
 558                         let funding_signed = {
 559                                 let events = $dest.get_and_clear_pending_msg_events();
 560                                 assert_eq!(events.len(), 1);
 561                                 if let events::MessageSendEvent::SendFundingSigned { ref msg, .. } = events[0] {
 562                                         msg.clone()
 563                                 } else { panic!("Wrong event type"); }
 564                         };
 565                         let events = $dest.get_and_clear_pending_events();
 566                         assert_eq!(events.len(), 1);
 567                         if let events::Event::ChannelPending{ ref counterparty_node_id, .. } = events[0] {
 568                                 assert_eq!(counterparty_node_id, &$source.get_our_node_id());
 569                         } else { panic!("Wrong event type"); }
 570
 571                         $source.handle_funding_signed(&$dest.get_our_node_id(), &funding_signed);
 572                         let events = $source.get_and_clear_pending_events();
 573                         assert_eq!(events.len(), 1);
 574                         if let events::Event::ChannelPending{ ref counterparty_node_id, .. } = events[0] {
 575                                 assert_eq!(counterparty_node_id, &$dest.get_our_node_id());
 576                         } else { panic!("Wrong event type"); }
 577
 578                         funding_output
 579                 } }
 580         }
 581
 582         macro_rules! confirm_txn {
 583                 ($node: expr) => { {
 584                         let chain_hash = genesis_block(Network::Bitcoin).block_hash();
 585                         let mut header = create_dummy_header(chain_hash, 42);
 586                         let txdata: Vec<_> = channel_txn.iter().enumerate().map(|(i, tx)| (i + 1, tx)).collect();
 587                         $node.transactions_confirmed(&header, &txdata, 1);
 588                         for _ in 2..100 {
 589                                 header = create_dummy_header(header.block_hash(), 42);
 590                         }
 591                         $node.best_block_updated(&header, 99);
 592                 } }
 593         }
 594
 595         macro_rules! lock_fundings {
 596                 ($nodes: expr) => { {
 597                         let mut node_events = Vec::new();
 598                         for node in $nodes.iter() {
 599                                 node_events.push(node.get_and_clear_pending_msg_events());
 600                         }
 601                         for (idx, node_event) in node_events.iter().enumerate() {
 602                                 for event in node_event {
 603                                         if let events::MessageSendEvent::SendChannelReady { ref node_id, ref msg } = event {
 604                                                 for node in $nodes.iter() {
 605                                                         if node.get_our_node_id() == *node_id {
 606                                                                 node.handle_channel_ready(&$nodes[idx].get_our_node_id(), msg);
 607                                                         }
 608                                                 }
 609                                         } else { panic!("Wrong event type"); }
 610                                 }
 611                         }
 612
 613                         for node in $nodes.iter() {
 614                                 let events = node.get_and_clear_pending_msg_events();
 615                                 for event in events {
 616                                         if let events::MessageSendEvent::SendAnnouncementSignatures { .. } = event {
 617                                         } else { panic!("Wrong event type"); }
 618                                 }
 619                         }
 620                 } }
 621         }
 622
 623         let fee_est_a = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 624         let mut last_htlc_clear_fee_a =  253;
 625         let fee_est_b = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 626         let mut last_htlc_clear_fee_b =  253;
 627         let fee_est_c = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 628         let mut last_htlc_clear_fee_c =  253;
 629
 630         // 3 nodes is enough to hit all the possible cases, notably unknown-source-unknown-dest
 631         // forwarding.
 632         let (node_a, mut monitor_a, keys_manager_a) = make_node!(0, fee_est_a);
 633         let (node_b, mut monitor_b, keys_manager_b) = make_node!(1, fee_est_b);
 634         let (node_c, mut monitor_c, keys_manager_c) = make_node!(2, fee_est_c);
 635
 636         let mut nodes = [node_a, node_b, node_c];
 637
 638         let chan_1_funding = make_channel!(nodes[0], nodes[1], 0);
 639         let chan_2_funding = make_channel!(nodes[1], nodes[2], 1);
 640
 641         for node in nodes.iter() {
 642                 confirm_txn!(node);
 643         }
 644
 645         lock_fundings!(nodes);
 646
 647         let chan_a = nodes[0].list_usable_channels()[0].short_channel_id.unwrap();
 648         let chan_b = nodes[2].list_usable_channels()[0].short_channel_id.unwrap();
 649
 650         let mut payment_id: u8 = 0;
 651         let mut payment_idx: u64 = 0;
 652
 653         let mut chan_a_disconnected = false;
 654         let mut chan_b_disconnected = false;
 655         let mut ab_events = Vec::new();
 656         let mut ba_events = Vec::new();
 657         let mut bc_events = Vec::new();
 658         let mut cb_events = Vec::new();
 659
 660         let mut node_a_ser = VecWriter(Vec::new());
 661         nodes[0].write(&mut node_a_ser).unwrap();
 662         let mut node_b_ser = VecWriter(Vec::new());
 663         nodes[1].write(&mut node_b_ser).unwrap();
 664         let mut node_c_ser = VecWriter(Vec::new());
 665         nodes[2].write(&mut node_c_ser).unwrap();
 666
 667         macro_rules! test_return {
 668                 () => { {
 669                         assert_eq!(nodes[0].list_channels().len(), 1);
 670                         assert_eq!(nodes[1].list_channels().len(), 2);
 671                         assert_eq!(nodes[2].list_channels().len(), 1);
 672                         return;
 673                 } }
 674         }
 675
 676         let mut read_pos = 0;
 677         macro_rules! get_slice {
 678                 ($len: expr) => {
 679                         {
 680                                 let slice_len = $len as usize;
 681                                 if data.len() < read_pos + slice_len {
 682                                         test_return!();
 683                                 }
 684                                 read_pos += slice_len;
 685                                 &data[read_pos - slice_len..read_pos]
 686                         }
 687                 }
 688         }
 689
 690         loop {
 691                 // Push any events from Node B onto ba_events and bc_events
 692                 macro_rules! push_excess_b_events {
 693                         ($excess_events: expr, $expect_drop_node: expr) => { {
 694                                 let a_id = nodes[0].get_our_node_id();
 695                                 let expect_drop_node: Option<usize> = $expect_drop_node;
 696                                 let expect_drop_id = if let Some(id) = expect_drop_node { Some(nodes[id].get_our_node_id()) } else { None };
 697                                 for event in $excess_events {
 698                                         let push_a = match event {
 699                                                 events::MessageSendEvent::UpdateHTLCs { ref node_id, .. } => {
 700                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 701                                                         *node_id == a_id
 702                                                 },
 703                                                 events::MessageSendEvent::SendRevokeAndACK { ref node_id, .. } => {
 704                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 705                                                         *node_id == a_id
 706                                                 },
 707                                                 events::MessageSendEvent::SendChannelReestablish { ref node_id, .. } => {
 708                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 709                                                         *node_id == a_id
 710                                                 },
 711                                                 events::MessageSendEvent::SendChannelReady { .. } => continue,
 712                                                 events::MessageSendEvent::SendAnnouncementSignatures { .. } => continue,
 713                                                 events::MessageSendEvent::SendChannelUpdate { ref node_id, ref msg } => {
 714                                                         assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 715                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 716                                                         *node_id == a_id
 717                                                 },
 718                                                 _ => panic!("Unhandled message event {:?}", event),
 719                                         };
 720                                         if push_a { ba_events.push(event); } else { bc_events.push(event); }
 721                                 }
 722                         } }
 723                 }
 724
 725                 // While delivering messages, we select across three possible message selection processes
 726                 // to ensure we get as much coverage as possible. See the individual enum variants for more
 727                 // details.
 728                 #[derive(PartialEq)]
 729                 enum ProcessMessages {
 730                         /// Deliver all available messages, including fetching any new messages from
 731                         /// `get_and_clear_pending_msg_events()` (which may have side effects).
 732                         AllMessages,
 733                         /// Call `get_and_clear_pending_msg_events()` first, and then deliver up to one
 734                         /// message (which may already be queued).
 735                         OneMessage,
 736                         /// Deliver up to one already-queued message. This avoids any potential side-effects
 737                         /// of `get_and_clear_pending_msg_events()` (eg freeing the HTLC holding cell), which
 738                         /// provides potentially more coverage.
 739                         OnePendingMessage,
 740                 }
 741
 742                 macro_rules! process_msg_events {
 743                         ($node: expr, $corrupt_forward: expr, $limit_events: expr) => { {
 744                                 let mut events = if $node == 1 {
 745                                         let mut new_events = Vec::new();
 746                                         mem::swap(&mut new_events, &mut ba_events);
 747                                         new_events.extend_from_slice(&bc_events[..]);
 748                                         bc_events.clear();
 749                                         new_events
 750                                 } else if $node == 0 {
 751                                         let mut new_events = Vec::new();
 752                                         mem::swap(&mut new_events, &mut ab_events);
 753                                         new_events
 754                                 } else {
 755                                         let mut new_events = Vec::new();
 756                                         mem::swap(&mut new_events, &mut cb_events);
 757                                         new_events
 758                                 };
 759                                 let mut new_events = Vec::new();
 760                                 if $limit_events != ProcessMessages::OnePendingMessage {
 761                                         new_events = nodes[$node].get_and_clear_pending_msg_events();
 762                                 }
 763                                 let mut had_events = false;
 764                                 let mut events_iter = events.drain(..).chain(new_events.drain(..));
 765                                 let mut extra_ev = None;
 766                                 for event in &mut events_iter {
 767                                         had_events = true;
 768                                         match event {
 769                                                 events::MessageSendEvent::UpdateHTLCs { node_id, updates: CommitmentUpdate { update_add_htlcs, update_fail_htlcs, update_fulfill_htlcs, update_fail_malformed_htlcs, update_fee, commitment_signed } } => {
 770                                                         for (idx, dest) in nodes.iter().enumerate() {
 771                                                                 if dest.get_our_node_id() == node_id {
 772                                                                         for update_add in update_add_htlcs.iter() {
 773                                                                                 out.locked_write(format!("Delivering update_add_htlc to node {}.\n", idx).as_bytes());
 774                                                                                 if !$corrupt_forward {
 775                                                                                         dest.handle_update_add_htlc(&nodes[$node].get_our_node_id(), update_add);
 776                                                                                 } else {
 777                                                                                         // Corrupt the update_add_htlc message so that its HMAC
 778                                                                                         // check will fail and we generate a
 779                                                                                         // update_fail_malformed_htlc instead of an
 780                                                                                         // update_fail_htlc as we do when we reject a payment.
 781                                                                                         let mut msg_ser = update_add.encode();
 782                                                                                         msg_ser[1000] ^= 0xff;
 783                                                                                         let new_msg = UpdateAddHTLC::read(&mut Cursor::new(&msg_ser)).unwrap();
 784                                                                                         dest.handle_update_add_htlc(&nodes[$node].get_our_node_id(), &new_msg);
 785                                                                                 }
 786                                                                         }
 787                                                                         for update_fulfill in update_fulfill_htlcs.iter() {
 788                                                                                 out.locked_write(format!("Delivering update_fulfill_htlc to node {}.\n", idx).as_bytes());
 789                                                                                 dest.handle_update_fulfill_htlc(&nodes[$node].get_our_node_id(), update_fulfill);
 790                                                                         }
 791                                                                         for update_fail in update_fail_htlcs.iter() {
 792                                                                                 out.locked_write(format!("Delivering update_fail_htlc to node {}.\n", idx).as_bytes());
 793                                                                                 dest.handle_update_fail_htlc(&nodes[$node].get_our_node_id(), update_fail);
 794                                                                         }
 795                                                                         for update_fail_malformed in update_fail_malformed_htlcs.iter() {
 796                                                                                 out.locked_write(format!("Delivering update_fail_malformed_htlc to node {}.\n", idx).as_bytes());
 797                                                                                 dest.handle_update_fail_malformed_htlc(&nodes[$node].get_our_node_id(), update_fail_malformed);
 798                                                                         }
 799                                                                         if let Some(msg) = update_fee {
 800                                                                                 out.locked_write(format!("Delivering update_fee to node {}.\n", idx).as_bytes());
 801                                                                                 dest.handle_update_fee(&nodes[$node].get_our_node_id(), &msg);
 802                                                                         }
 803                                                                         let processed_change = !update_add_htlcs.is_empty() || !update_fulfill_htlcs.is_empty() ||
 804                                                                                 !update_fail_htlcs.is_empty() || !update_fail_malformed_htlcs.is_empty();
 805                                                                         if $limit_events != ProcessMessages::AllMessages && processed_change {
 806                                                                                 // If we only want to process some messages, don't deliver the CS until later.
 807                                                                                 extra_ev = Some(events::MessageSendEvent::UpdateHTLCs { node_id, updates: CommitmentUpdate {
 808                                                                                         update_add_htlcs: Vec::new(),
 809                                                                                         update_fail_htlcs: Vec::new(),
 810                                                                                         update_fulfill_htlcs: Vec::new(),
 811                                                                                         update_fail_malformed_htlcs: Vec::new(),
 812                                                                                         update_fee: None,
 813                                                                                         commitment_signed
 814                                                                                 } });
 815                                                                                 break;
 816                                                                         }
 817                                                                         out.locked_write(format!("Delivering commitment_signed to node {}.\n", idx).as_bytes());
 818                                                                         dest.handle_commitment_signed(&nodes[$node].get_our_node_id(), &commitment_signed);
 819                                                                         break;
 820                                                                 }
 821                                                         }
 822                                                 },
 823                                                 events::MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
 824                                                         for (idx, dest) in nodes.iter().enumerate() {
 825                                                                 if dest.get_our_node_id() == *node_id {
 826                                                                         out.locked_write(format!("Delivering revoke_and_ack to node {}.\n", idx).as_bytes());
 827                                                                         dest.handle_revoke_and_ack(&nodes[$node].get_our_node_id(), msg);
 828                                                                 }
 829                                                         }
 830                                                 },
 831                                                 events::MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
 832                                                         for (idx, dest) in nodes.iter().enumerate() {
 833                                                                 if dest.get_our_node_id() == *node_id {
 834                                                                         out.locked_write(format!("Delivering channel_reestablish to node {}.\n", idx).as_bytes());
 835                                                                         dest.handle_channel_reestablish(&nodes[$node].get_our_node_id(), msg);
 836                                                                 }
 837                                                         }
 838                                                 },
 839                                                 events::MessageSendEvent::SendChannelReady { .. } => {
 840                                                         // Can be generated as a reestablish response
 841                                                 },
 842                                                 events::MessageSendEvent::SendAnnouncementSignatures { .. } => {
 843                                                         // Can be generated as a reestablish response
 844                                                 },
 845                                                 events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 846                                                         // When we reconnect we will resend a channel_update to make sure our
 847                                                         // counterparty has the latest parameters for receiving payments
 848                                                         // through us. We do, however, check that the message does not include
 849                                                         // the "disabled" bit, as we should never ever have a channel which is
 850                                                         // disabled when we send such an update (or it may indicate channel
 851                                                         // force-close which we should detect as an error).
 852                                                         assert_eq!(msg.contents.flags & 2, 0);
 853                                                 },
 854                                                 _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 855                                                         return;
 856                                                 } else {
 857                                                         panic!("Unhandled message event {:?}", event)
 858                                                 },
 859                                         }
 860                                         if $limit_events != ProcessMessages::AllMessages {
 861                                                 break;
 862                                         }
 863                                 }
 864                                 if $node == 1 {
 865                                         push_excess_b_events!(extra_ev.into_iter().chain(events_iter), None);
 866                                 } else if $node == 0 {
 867                                         if let Some(ev) = extra_ev { ab_events.push(ev); }
 868                                         for event in events_iter { ab_events.push(event); }
 869                                 } else {
 870                                         if let Some(ev) = extra_ev { cb_events.push(ev); }
 871                                         for event in events_iter { cb_events.push(event); }
 872                                 }
 873                                 had_events
 874                         } }
 875                 }
 876
 877                 macro_rules! drain_msg_events_on_disconnect {
 878                         ($counterparty_id: expr) => { {
 879                                 if $counterparty_id == 0 {
 880                                         for event in nodes[0].get_and_clear_pending_msg_events() {
 881                                                 match event {
 882                                                         events::MessageSendEvent::UpdateHTLCs { .. } => {},
 883                                                         events::MessageSendEvent::SendRevokeAndACK { .. } => {},
 884                                                         events::MessageSendEvent::SendChannelReestablish { .. } => {},
 885                                                         events::MessageSendEvent::SendChannelReady { .. } => {},
 886                                                         events::MessageSendEvent::SendAnnouncementSignatures { .. } => {},
 887                                                         events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 888                                                                 assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 889                                                         },
 890                                                         _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 891                                                                 return;
 892                                                         } else {
 893                                                                 panic!("Unhandled message event")
 894                                                         },
 895                                                 }
 896                                         }
 897                                         push_excess_b_events!(nodes[1].get_and_clear_pending_msg_events().drain(..), Some(0));
 898                                         ab_events.clear();
 899                                         ba_events.clear();
 900                                 } else {
 901                                         for event in nodes[2].get_and_clear_pending_msg_events() {
 902                                                 match event {
 903                                                         events::MessageSendEvent::UpdateHTLCs { .. } => {},
 904                                                         events::MessageSendEvent::SendRevokeAndACK { .. } => {},
 905                                                         events::MessageSendEvent::SendChannelReestablish { .. } => {},
 906                                                         events::MessageSendEvent::SendChannelReady { .. } => {},
 907                                                         events::MessageSendEvent::SendAnnouncementSignatures { .. } => {},
 908                                                         events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 909                                                                 assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 910                                                         },
 911                                                         _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 912                                                                 return;
 913                                                         } else {
 914                                                                 panic!("Unhandled message event")
 915                                                         },
 916                                                 }
 917                                         }
 918                                         push_excess_b_events!(nodes[1].get_and_clear_pending_msg_events().drain(..), Some(2));
 919                                         bc_events.clear();
 920                                         cb_events.clear();
 921                                 }
 922                         } }
 923                 }
 924
 925                 macro_rules! process_events {
 926                         ($node: expr, $fail: expr) => { {
 927                                 // In case we get 256 payments we may have a hash collision, resulting in the
 928                                 // second claim/fail call not finding the duplicate-hash HTLC, so we have to
 929                                 // deduplicate the calls here.
 930                                 let mut claim_set = HashSet::new();
 931                                 let mut events = nodes[$node].get_and_clear_pending_events();
 932                                 // Sort events so that PendingHTLCsForwardable get processed last. This avoids a
 933                                 // case where we first process a PendingHTLCsForwardable, then claim/fail on a
 934                                 // PaymentClaimable, claiming/failing two HTLCs, but leaving a just-generated
 935                                 // PaymentClaimable event for the second HTLC in our pending_events (and breaking
 936                                 // our claim_set deduplication).
 937                                 events.sort_by(|a, b| {
 938                                         if let events::Event::PaymentClaimable { .. } = a {
 939                                                 if let events::Event::PendingHTLCsForwardable { .. } = b {
 940                                                         Ordering::Less
 941                                                 } else { Ordering::Equal }
 942                                         } else if let events::Event::PendingHTLCsForwardable { .. } = a {
 943                                                 if let events::Event::PaymentClaimable { .. } = b {
 944                                                         Ordering::Greater
 945                                                 } else { Ordering::Equal }
 946                                         } else { Ordering::Equal }
 947                                 });
 948                                 let had_events = !events.is_empty();
 949                                 for event in events.drain(..) {
 950                                         match event {
 951                                                 events::Event::PaymentClaimable { payment_hash, .. } => {
 952                                                         if claim_set.insert(payment_hash.0) {
 953                                                                 if $fail {
 954                                                                         nodes[$node].fail_htlc_backwards(&payment_hash);
 955                                                                 } else {
 956                                                                         nodes[$node].claim_funds(PaymentPreimage(payment_hash.0));
 957                                                                 }
 958                                                         }
 959                                                 },
 960                                                 events::Event::PaymentSent { .. } => {},
 961                                                 events::Event::PaymentClaimed { .. } => {},
 962                                                 events::Event::PaymentPathSuccessful { .. } => {},
 963                                                 events::Event::PaymentPathFailed { .. } => {},
 964                                                 events::Event::PaymentFailed { .. } => {},
 965                                                 events::Event::ProbeSuccessful { .. } | events::Event::ProbeFailed { .. } => {
 966                                                         // Even though we don't explicitly send probes, because probes are
 967                                                         // detected based on hashing the payment hash+preimage, its rather
 968                                                         // trivial for the fuzzer to build payments that accidentally end up
 969                                                         // looking like probes.
 970                                                 },
 971                                                 events::Event::PaymentForwarded { .. } if $node == 1 => {},
 972                                                 events::Event::ChannelReady { .. } => {},
 973                                                 events::Event::PendingHTLCsForwardable { .. } => {
 974                                                         nodes[$node].process_pending_htlc_forwards();
 975                                                 },
 976                                                 events::Event::HTLCHandlingFailed { .. } => {},
 977                                                 _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 978                                                         return;
 979                                                 } else {
 980                                                         panic!("Unhandled event")
 981                                                 },
 982                                         }
 983                                 }
 984                                 had_events
 985                         } }
 986                 }
 987
 988                 let v = get_slice!(1)[0];
 989                 out.locked_write(format!("READ A BYTE! HANDLING INPUT {:x}...........\n", v).as_bytes());
 990                 match v {
 991                         // In general, we keep related message groups close together in binary form, allowing
 992                         // bit-twiddling mutations to have similar effects. This is probably overkill, but no
 993                         // harm in doing so.
 994
 995                         0x00 => *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
 996                         0x01 => *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
 997                         0x02 => *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
 998                         0x04 => *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
 999                         0x05 => *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
1000                         0x06 => *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
1001
1002                         0x08 => {
1003                                 if let Some((id, _)) = monitor_a.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1004                                         monitor_a.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
1005                                         nodes[0].process_monitor_events();
1006                                 }
1007                         },
1008                         0x09 => {
1009                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1010                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
1011                                         nodes[1].process_monitor_events();
1012                                 }
1013                         },
1014                         0x0a => {
1015                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1016                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1017                                         nodes[1].process_monitor_events();
1018                                 }
1019                         },
1020                         0x0b => {
1021                                 if let Some((id, _)) = monitor_c.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1022                                         monitor_c.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1023                                         nodes[2].process_monitor_events();
1024                                 }
1025                         },
1026
1027                         0x0c => {
1028                                 if !chan_a_disconnected {
1029                                         nodes[0].peer_disconnected(&nodes[1].get_our_node_id());
1030                                         nodes[1].peer_disconnected(&nodes[0].get_our_node_id());
1031                                         chan_a_disconnected = true;
1032                                         drain_msg_events_on_disconnect!(0);
1033                                 }
1034                         },
1035                         0x0d => {
1036                                 if !chan_b_disconnected {
1037                                         nodes[1].peer_disconnected(&nodes[2].get_our_node_id());
1038                                         nodes[2].peer_disconnected(&nodes[1].get_our_node_id());
1039                                         chan_b_disconnected = true;
1040                                         drain_msg_events_on_disconnect!(2);
1041                                 }
1042                         },
1043                         0x0e => {
1044                                 if chan_a_disconnected {
1045                                         nodes[0].peer_connected(&nodes[1].get_our_node_id(), &Init {
1046                                                 features: nodes[1].init_features(), networks: None, remote_network_address: None
1047                                         }, true).unwrap();
1048                                         nodes[1].peer_connected(&nodes[0].get_our_node_id(), &Init {
1049                                                 features: nodes[0].init_features(), networks: None, remote_network_address: None
1050                                         }, false).unwrap();
1051                                         chan_a_disconnected = false;
1052                                 }
1053                         },
1054                         0x0f => {
1055                                 if chan_b_disconnected {
1056                                         nodes[1].peer_connected(&nodes[2].get_our_node_id(), &Init {
1057                                                 features: nodes[2].init_features(), networks: None, remote_network_address: None
1058                                         }, true).unwrap();
1059                                         nodes[2].peer_connected(&nodes[1].get_our_node_id(), &Init {
1060                                                 features: nodes[1].init_features(), networks: None, remote_network_address: None
1061                                         }, false).unwrap();
1062                                         chan_b_disconnected = false;
1063                                 }
1064                         },
1065
1066                         0x10 => { process_msg_events!(0, true, ProcessMessages::AllMessages); },
1067                         0x11 => { process_msg_events!(0, false, ProcessMessages::AllMessages); },
1068                         0x12 => { process_msg_events!(0, true, ProcessMessages::OneMessage); },
1069                         0x13 => { process_msg_events!(0, false, ProcessMessages::OneMessage); },
1070                         0x14 => { process_msg_events!(0, true, ProcessMessages::OnePendingMessage); },
1071                         0x15 => { process_msg_events!(0, false, ProcessMessages::OnePendingMessage); },
1072
1073                         0x16 => { process_events!(0, true); },
1074                         0x17 => { process_events!(0, false); },
1075
1076                         0x18 => { process_msg_events!(1, true, ProcessMessages::AllMessages); },
1077                         0x19 => { process_msg_events!(1, false, ProcessMessages::AllMessages); },
1078                         0x1a => { process_msg_events!(1, true, ProcessMessages::OneMessage); },
1079                         0x1b => { process_msg_events!(1, false, ProcessMessages::OneMessage); },
1080                         0x1c => { process_msg_events!(1, true, ProcessMessages::OnePendingMessage); },
1081                         0x1d => { process_msg_events!(1, false, ProcessMessages::OnePendingMessage); },
1082
1083                         0x1e => { process_events!(1, true); },
1084                         0x1f => { process_events!(1, false); },
1085
1086                         0x20 => { process_msg_events!(2, true, ProcessMessages::AllMessages); },
1087                         0x21 => { process_msg_events!(2, false, ProcessMessages::AllMessages); },
1088                         0x22 => { process_msg_events!(2, true, ProcessMessages::OneMessage); },
1089                         0x23 => { process_msg_events!(2, false, ProcessMessages::OneMessage); },
1090                         0x24 => { process_msg_events!(2, true, ProcessMessages::OnePendingMessage); },
1091                         0x25 => { process_msg_events!(2, false, ProcessMessages::OnePendingMessage); },
1092
1093                         0x26 => { process_events!(2, true); },
1094                         0x27 => { process_events!(2, false); },
1095
1096                         0x2c => {
1097                                 if !chan_a_disconnected {
1098                                         nodes[1].peer_disconnected(&nodes[0].get_our_node_id());
1099                                         chan_a_disconnected = true;
1100                                         push_excess_b_events!(nodes[1].get_and_clear_pending_msg_events().drain(..), Some(0));
1101                                         ab_events.clear();
1102                                         ba_events.clear();
1103                                 }
1104                                 let (new_node_a, new_monitor_a) = reload_node!(node_a_ser, 0, monitor_a, keys_manager_a, fee_est_a);
1105                                 nodes[0] = new_node_a;
1106                                 monitor_a = new_monitor_a;
1107                         },
1108                         0x2d => {
1109                                 if !chan_a_disconnected {
1110                                         nodes[0].peer_disconnected(&nodes[1].get_our_node_id());
1111                                         chan_a_disconnected = true;
1112                                         nodes[0].get_and_clear_pending_msg_events();
1113                                         ab_events.clear();
1114                                         ba_events.clear();
1115                                 }
1116                                 if !chan_b_disconnected {
1117                                         nodes[2].peer_disconnected(&nodes[1].get_our_node_id());
1118                                         chan_b_disconnected = true;
1119                                         nodes[2].get_and_clear_pending_msg_events();
1120                                         bc_events.clear();
1121                                         cb_events.clear();
1122                                 }
1123                                 let (new_node_b, new_monitor_b) = reload_node!(node_b_ser, 1, monitor_b, keys_manager_b, fee_est_b);
1124                                 nodes[1] = new_node_b;
1125                                 monitor_b = new_monitor_b;
1126                         },
1127                         0x2e => {
1128                                 if !chan_b_disconnected {
1129                                         nodes[1].peer_disconnected(&nodes[2].get_our_node_id());
1130                                         chan_b_disconnected = true;
1131                                         push_excess_b_events!(nodes[1].get_and_clear_pending_msg_events().drain(..), Some(2));
1132                                         bc_events.clear();
1133                                         cb_events.clear();
1134                                 }
1135                                 let (new_node_c, new_monitor_c) = reload_node!(node_c_ser, 2, monitor_c, keys_manager_c, fee_est_c);
1136                                 nodes[2] = new_node_c;
1137                                 monitor_c = new_monitor_c;
1138                         },
1139
1140                         // 1/10th the channel size:
1141                         0x30 => { send_payment(&nodes[0], &nodes[1], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1142                         0x31 => { send_payment(&nodes[1], &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1143                         0x32 => { send_payment(&nodes[1], &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1144                         0x33 => { send_payment(&nodes[2], &nodes[1], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1145                         0x34 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1146                         0x35 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1147
1148                         0x38 => { send_payment(&nodes[0], &nodes[1], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1149                         0x39 => { send_payment(&nodes[1], &nodes[0], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1150                         0x3a => { send_payment(&nodes[1], &nodes[2], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1151                         0x3b => { send_payment(&nodes[2], &nodes[1], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1152                         0x3c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1153                         0x3d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1154
1155                         0x40 => { send_payment(&nodes[0], &nodes[1], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1156                         0x41 => { send_payment(&nodes[1], &nodes[0], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1157                         0x42 => { send_payment(&nodes[1], &nodes[2], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1158                         0x43 => { send_payment(&nodes[2], &nodes[1], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1159                         0x44 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1160                         0x45 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1161
1162                         0x48 => { send_payment(&nodes[0], &nodes[1], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1163                         0x49 => { send_payment(&nodes[1], &nodes[0], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1164                         0x4a => { send_payment(&nodes[1], &nodes[2], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1165                         0x4b => { send_payment(&nodes[2], &nodes[1], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1166                         0x4c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1167                         0x4d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1168
1169                         0x50 => { send_payment(&nodes[0], &nodes[1], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1170                         0x51 => { send_payment(&nodes[1], &nodes[0], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1171                         0x52 => { send_payment(&nodes[1], &nodes[2], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1172                         0x53 => { send_payment(&nodes[2], &nodes[1], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1173                         0x54 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1174                         0x55 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1175
1176                         0x58 => { send_payment(&nodes[0], &nodes[1], chan_a, 100, &mut payment_id, &mut payment_idx); },
1177                         0x59 => { send_payment(&nodes[1], &nodes[0], chan_a, 100, &mut payment_id, &mut payment_idx); },
1178                         0x5a => { send_payment(&nodes[1], &nodes[2], chan_b, 100, &mut payment_id, &mut payment_idx); },
1179                         0x5b => { send_payment(&nodes[2], &nodes[1], chan_b, 100, &mut payment_id, &mut payment_idx); },
1180                         0x5c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 100, &mut payment_id, &mut payment_idx); },
1181                         0x5d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 100, &mut payment_id, &mut payment_idx); },
1182
1183                         0x60 => { send_payment(&nodes[0], &nodes[1], chan_a, 10, &mut payment_id, &mut payment_idx); },
1184                         0x61 => { send_payment(&nodes[1], &nodes[0], chan_a, 10, &mut payment_id, &mut payment_idx); },
1185                         0x62 => { send_payment(&nodes[1], &nodes[2], chan_b, 10, &mut payment_id, &mut payment_idx); },
1186                         0x63 => { send_payment(&nodes[2], &nodes[1], chan_b, 10, &mut payment_id, &mut payment_idx); },
1187                         0x64 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10, &mut payment_id, &mut payment_idx); },
1188                         0x65 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10, &mut payment_id, &mut payment_idx); },
1189
1190                         0x68 => { send_payment(&nodes[0], &nodes[1], chan_a, 1, &mut payment_id, &mut payment_idx); },
1191                         0x69 => { send_payment(&nodes[1], &nodes[0], chan_a, 1, &mut payment_id, &mut payment_idx); },
1192                         0x6a => { send_payment(&nodes[1], &nodes[2], chan_b, 1, &mut payment_id, &mut payment_idx); },
1193                         0x6b => { send_payment(&nodes[2], &nodes[1], chan_b, 1, &mut payment_id, &mut payment_idx); },
1194                         0x6c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1, &mut payment_id, &mut payment_idx); },
1195                         0x6d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1, &mut payment_id, &mut payment_idx); },
1196
1197                         0x80 => {
1198                                 let max_feerate = last_htlc_clear_fee_a * FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1199                                 if fee_est_a.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1200                                         fee_est_a.ret_val.store(max_feerate, atomic::Ordering::Release);
1201                                 }
1202                                 nodes[0].maybe_update_chan_fees();
1203                         },
1204                         0x81 => { fee_est_a.ret_val.store(253, atomic::Ordering::Release); nodes[0].maybe_update_chan_fees(); },
1205
1206                         0x84 => {
1207                                 let max_feerate = last_htlc_clear_fee_b * FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1208                                 if fee_est_b.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1209                                         fee_est_b.ret_val.store(max_feerate, atomic::Ordering::Release);
1210                                 }
1211                                 nodes[1].maybe_update_chan_fees();
1212                         },
1213                         0x85 => { fee_est_b.ret_val.store(253, atomic::Ordering::Release); nodes[1].maybe_update_chan_fees(); },
1214
1215                         0x88 => {
1216                                 let max_feerate = last_htlc_clear_fee_c * FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1217                                 if fee_est_c.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1218                                         fee_est_c.ret_val.store(max_feerate, atomic::Ordering::Release);
1219                                 }
1220                                 nodes[2].maybe_update_chan_fees();
1221                         },
1222                         0x89 => { fee_est_c.ret_val.store(253, atomic::Ordering::Release); nodes[2].maybe_update_chan_fees(); },
1223
1224                         0xff => {
1225                                 // Test that no channel is in a stuck state where neither party can send funds even
1226                                 // after we resolve all pending events.
1227                                 // First make sure there are no pending monitor updates, resetting the error state
1228                                 // and calling force_channel_monitor_updated for each monitor.
1229                                 *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1230                                 *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1231                                 *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1232
1233                                 if let Some((id, _)) = monitor_a.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1234                                         monitor_a.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
1235                                         nodes[0].process_monitor_events();
1236                                 }
1237                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1238                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
1239                                         nodes[1].process_monitor_events();
1240                                 }
1241                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1242                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1243                                         nodes[1].process_monitor_events();
1244                                 }
1245                                 if let Some((id, _)) = monitor_c.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1246                                         monitor_c.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1247                                         nodes[2].process_monitor_events();
1248                                 }
1249
1250                                 // Next, make sure peers are all connected to each other
1251                                 if chan_a_disconnected {
1252                                         nodes[0].peer_connected(&nodes[1].get_our_node_id(), &Init {
1253                                                 features: nodes[1].init_features(), networks: None, remote_network_address: None
1254                                         }, true).unwrap();
1255                                         nodes[1].peer_connected(&nodes[0].get_our_node_id(), &Init {
1256                                                 features: nodes[0].init_features(), networks: None, remote_network_address: None
1257                                         }, false).unwrap();
1258                                         chan_a_disconnected = false;
1259                                 }
1260                                 if chan_b_disconnected {
1261                                         nodes[1].peer_connected(&nodes[2].get_our_node_id(), &Init {
1262                                                 features: nodes[2].init_features(), networks: None, remote_network_address: None
1263                                         }, true).unwrap();
1264                                         nodes[2].peer_connected(&nodes[1].get_our_node_id(), &Init {
1265                                                 features: nodes[1].init_features(), networks: None, remote_network_address: None
1266                                         }, false).unwrap();
1267                                         chan_b_disconnected = false;
1268                                 }
1269
1270                                 for i in 0..std::usize::MAX {
1271                                         if i == 100 { panic!("It may take may iterations to settle the state, but it should not take forever"); }
1272                                         // Then, make sure any current forwards make their way to their destination
1273                                         if process_msg_events!(0, false, ProcessMessages::AllMessages) { continue; }
1274                                         if process_msg_events!(1, false, ProcessMessages::AllMessages) { continue; }
1275                                         if process_msg_events!(2, false, ProcessMessages::AllMessages) { continue; }
1276                                         // ...making sure any pending PendingHTLCsForwardable events are handled and
1277                                         // payments claimed.
1278                                         if process_events!(0, false) { continue; }
1279                                         if process_events!(1, false) { continue; }
1280                                         if process_events!(2, false) { continue; }
1281                                         break;
1282                                 }
1283
1284                                 // Finally, make sure that at least one end of each channel can make a substantial payment
1285                                 assert!(
1286                                         send_payment(&nodes[0], &nodes[1], chan_a, 10_000_000, &mut payment_id, &mut payment_idx) ||
1287                                         send_payment(&nodes[1], &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx));
1288                                 assert!(
1289                                         send_payment(&nodes[1], &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx) ||
1290                                         send_payment(&nodes[2], &nodes[1], chan_b, 10_000_000, &mut payment_id, &mut payment_idx));
1291
1292                                 last_htlc_clear_fee_a = fee_est_a.ret_val.load(atomic::Ordering::Acquire);
1293                                 last_htlc_clear_fee_b = fee_est_b.ret_val.load(atomic::Ordering::Acquire);
1294                                 last_htlc_clear_fee_c = fee_est_c.ret_val.load(atomic::Ordering::Acquire);
1295                         },
1296                         _ => test_return!(),
1297                 }
1298
1299                 node_a_ser.0.clear();
1300                 nodes[0].write(&mut node_a_ser).unwrap();
1301                 node_b_ser.0.clear();
1302                 nodes[1].write(&mut node_b_ser).unwrap();
1303                 node_c_ser.0.clear();
1304                 nodes[2].write(&mut node_c_ser).unwrap();
1305         }
1306 }
1307
1308 /// We actually have different behavior based on if a certain log string has been seen, so we have
1309 /// to do a bit more tracking.
1310 #[derive(Clone)]
1311 struct SearchingOutput<O: Output> {
1312         output: O,
1313         may_fail: Arc<atomic::AtomicBool>,
1314 }
1315 impl<O: Output> Output for SearchingOutput<O> {
1316         fn locked_write(&self, data: &[u8]) {
1317                 // We hit a design limitation of LN state machine (see CONCURRENT_INBOUND_HTLC_FEE_BUFFER)
1318                 if std::str::from_utf8(data).unwrap().contains("Outbound update_fee HTLC buffer overflow - counterparty should force-close this channel") {
1319                         self.may_fail.store(true, atomic::Ordering::Release);
1320                 }
1321                 self.output.locked_write(data)
1322         }
1323 }
1324 impl<O: Output> SearchingOutput<O> {
1325         pub fn new(output: O) -> Self {
1326                 Self { output, may_fail: Arc::new(atomic::AtomicBool::new(false)) }
1327         }
1328 }
1329
1330 pub fn chanmon_consistency_test<Out: Output>(data: &[u8], out: Out) {
1331         do_test(data, out);
1332 }
1333
1334 #[no_mangle]
1335 pub extern "C" fn chanmon_consistency_run(data: *const u8, datalen: usize) {
1336         do_test(unsafe { std::slice::from_raw_parts(data, datalen) }, test_logger::DevNull{});
1337 }