_ 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         pub should_update_manager: atomic::AtomicBool,
 129 }
 130 impl TestChainMonitor {
 131         pub fn new(broadcaster: Arc<TestBroadcaster>, logger: Arc<dyn Logger>, feeest: Arc<FuzzEstimator>, persister: Arc<TestPersister>, keys: Arc<KeyProvider>) -> Self {
 132                 Self {
 133                         chain_monitor: Arc::new(chainmonitor::ChainMonitor::new(None, broadcaster, logger.clone(), feeest, Arc::clone(&persister))),
 134                         logger,
 135                         keys,
 136                         persister,
 137                         latest_monitors: Mutex::new(HashMap::new()),
 138                         should_update_manager: atomic::AtomicBool::new(false),
 139                 }
 140         }
 141 }
 142 impl chain::Watch<TestChannelSigner> for TestChainMonitor {
 143         fn watch_channel(&self, funding_txo: OutPoint, monitor: channelmonitor::ChannelMonitor<TestChannelSigner>) -> chain::ChannelMonitorUpdateStatus {
 144                 let mut ser = VecWriter(Vec::new());
 145                 monitor.write(&mut ser).unwrap();
 146                 if let Some(_) = self.latest_monitors.lock().unwrap().insert(funding_txo, (monitor.get_latest_update_id(), ser.0)) {
 147                         panic!("Already had monitor pre-watch_channel");
 148                 }
 149                 self.should_update_manager.store(true, atomic::Ordering::Relaxed);
 150                 self.chain_monitor.watch_channel(funding_txo, monitor)
 151         }
 152
 153         fn update_channel(&self, funding_txo: OutPoint, update: &channelmonitor::ChannelMonitorUpdate) -> chain::ChannelMonitorUpdateStatus {
 154                 let mut map_lock = self.latest_monitors.lock().unwrap();
 155                 let mut map_entry = match map_lock.entry(funding_txo) {
 156                         hash_map::Entry::Occupied(entry) => entry,
 157                         hash_map::Entry::Vacant(_) => panic!("Didn't have monitor on update call"),
 158                 };
 159                 let deserialized_monitor = <(BlockHash, channelmonitor::ChannelMonitor<TestChannelSigner>)>::
 160                         read(&mut Cursor::new(&map_entry.get().1), (&*self.keys, &*self.keys)).unwrap().1;
 161                 deserialized_monitor.update_monitor(update, &&TestBroadcaster{}, &FuzzEstimator { ret_val: atomic::AtomicU32::new(253) }, &self.logger).unwrap();
 162                 let mut ser = VecWriter(Vec::new());
 163                 deserialized_monitor.write(&mut ser).unwrap();
 164                 map_entry.insert((update.update_id, ser.0));
 165                 self.should_update_manager.store(true, atomic::Ordering::Relaxed);
 166                 self.chain_monitor.update_channel(funding_txo, update)
 167         }
 168
 169         fn release_pending_monitor_events(&self) -> Vec<(OutPoint, Vec<MonitorEvent>, Option<PublicKey>)> {
 170                 return self.chain_monitor.release_pending_monitor_events();
 171         }
 172 }
 173
 174 struct KeyProvider {
 175         node_secret: SecretKey,
 176         rand_bytes_id: atomic::AtomicU32,
 177         enforcement_states: Mutex<HashMap<[u8;32], Arc<Mutex<EnforcementState>>>>,
 178 }
 179
 180 impl EntropySource for KeyProvider {
 181         fn get_secure_random_bytes(&self) -> [u8; 32] {
 182                 let id = self.rand_bytes_id.fetch_add(1, atomic::Ordering::Relaxed);
 183                 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]];
 184                 res[30-4..30].copy_from_slice(&id.to_le_bytes());
 185                 res
 186         }
 187 }
 188
 189 impl NodeSigner for KeyProvider {
 190         fn get_node_id(&self, recipient: Recipient) -> Result<PublicKey, ()> {
 191                 let node_secret = match recipient {
 192                         Recipient::Node => Ok(&self.node_secret),
 193                         Recipient::PhantomNode => Err(())
 194                 }?;
 195                 Ok(PublicKey::from_secret_key(&Secp256k1::signing_only(), node_secret))
 196         }
 197
 198         fn ecdh(&self, recipient: Recipient, other_key: &PublicKey, tweak: Option<&Scalar>) -> Result<SharedSecret, ()> {
 199                 let mut node_secret = match recipient {
 200                         Recipient::Node => Ok(self.node_secret.clone()),
 201                         Recipient::PhantomNode => Err(())
 202                 }?;
 203                 if let Some(tweak) = tweak {
 204                         node_secret = node_secret.mul_tweak(tweak).map_err(|_| ())?;
 205                 }
 206                 Ok(SharedSecret::new(other_key, &node_secret))
 207         }
 208
 209         fn get_inbound_payment_key_material(&self) -> KeyMaterial {
 210                 KeyMaterial([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, self.node_secret[31]])
 211         }
 212
 213         fn sign_invoice(&self, _hrp_bytes: &[u8], _invoice_data: &[u5], _recipient: Recipient) -> Result<RecoverableSignature, ()> {
 214                 unreachable!()
 215         }
 216
 217         fn sign_bolt12_invoice_request(
 218                 &self, _invoice_request: &UnsignedInvoiceRequest
 219         ) -> Result<schnorr::Signature, ()> {
 220                 unreachable!()
 221         }
 222
 223         fn sign_bolt12_invoice(
 224                 &self, _invoice: &UnsignedBolt12Invoice,
 225         ) -> Result<schnorr::Signature, ()> {
 226                 unreachable!()
 227         }
 228
 229         fn sign_gossip_message(&self, msg: lightning::ln::msgs::UnsignedGossipMessage) -> Result<Signature, ()> {
 230                 let msg_hash = Message::from_slice(&Sha256dHash::hash(&msg.encode()[..])[..]).map_err(|_| ())?;
 231                 let secp_ctx = Secp256k1::signing_only();
 232                 Ok(secp_ctx.sign_ecdsa(&msg_hash, &self.node_secret))
 233         }
 234 }
 235
 236 impl SignerProvider for KeyProvider {
 237         type Signer = TestChannelSigner;
 238
 239         fn generate_channel_keys_id(&self, _inbound: bool, _channel_value_satoshis: u64, _user_channel_id: u128) -> [u8; 32] {
 240                 let id = self.rand_bytes_id.fetch_add(1, atomic::Ordering::Relaxed) as u8;
 241                 [id; 32]
 242         }
 243
 244         fn derive_channel_signer(&self, channel_value_satoshis: u64, channel_keys_id: [u8; 32]) -> Self::Signer {
 245                 let secp_ctx = Secp256k1::signing_only();
 246                 let id = channel_keys_id[0];
 247                 let keys = InMemorySigner::new(
 248                         &secp_ctx,
 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, 4, self.node_secret[31]]).unwrap(),
 250                         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(),
 251                         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(),
 252                         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(),
 253                         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(),
 254                         [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]],
 255                         channel_value_satoshis,
 256                         channel_keys_id,
 257                         channel_keys_id,
 258                 );
 259                 let revoked_commitment = self.make_enforcement_state_cell(keys.commitment_seed);
 260                 TestChannelSigner::new_with_revoked(keys, revoked_commitment, false)
 261         }
 262
 263         fn read_chan_signer(&self, buffer: &[u8]) -> Result<Self::Signer, DecodeError> {
 264                 let mut reader = std::io::Cursor::new(buffer);
 265
 266                 let inner: InMemorySigner = ReadableArgs::read(&mut reader, self)?;
 267                 let state = self.make_enforcement_state_cell(inner.commitment_seed);
 268
 269                 Ok(TestChannelSigner {
 270                         inner,
 271                         state,
 272                         disable_revocation_policy_check: false,
 273                 })
 274         }
 275
 276         fn get_destination_script(&self) -> Result<Script, ()> {
 277                 let secp_ctx = Secp256k1::signing_only();
 278                 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();
 279                 let our_channel_monitor_claim_key_hash = WPubkeyHash::hash(&PublicKey::from_secret_key(&secp_ctx, &channel_monitor_claim_key).serialize());
 280                 Ok(Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0).push_slice(&our_channel_monitor_claim_key_hash[..]).into_script())
 281         }
 282
 283         fn get_shutdown_scriptpubkey(&self) -> Result<ShutdownScript, ()> {
 284                 let secp_ctx = Secp256k1::signing_only();
 285                 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();
 286                 let pubkey_hash = WPubkeyHash::hash(&PublicKey::from_secret_key(&secp_ctx, &secret_key).serialize());
 287                 Ok(ShutdownScript::new_p2wpkh(&pubkey_hash))
 288         }
 289 }
 290
 291 impl KeyProvider {
 292         fn make_enforcement_state_cell(&self, commitment_seed: [u8; 32]) -> Arc<Mutex<EnforcementState>> {
 293                 let mut revoked_commitments = self.enforcement_states.lock().unwrap();
 294                 if !revoked_commitments.contains_key(&commitment_seed) {
 295                         revoked_commitments.insert(commitment_seed, Arc::new(Mutex::new(EnforcementState::new())));
 296                 }
 297                 let cell = revoked_commitments.get(&commitment_seed).unwrap();
 298                 Arc::clone(cell)
 299         }
 300 }
 301
 302 #[inline]
 303 fn check_api_err(api_err: APIError, sendable_bounds_violated: bool) {
 304         match api_err {
 305                 APIError::APIMisuseError { .. } => panic!("We can't misuse the API"),
 306                 APIError::FeeRateTooHigh { .. } => panic!("We can't send too much fee?"),
 307                 APIError::InvalidRoute { .. } => panic!("Our routes should work"),
 308                 APIError::ChannelUnavailable { err } => {
 309                         // Test the error against a list of errors we can hit, and reject
 310                         // all others. If you hit this panic, the list of acceptable errors
 311                         // is probably just stale and you should add new messages here.
 312                         match err.as_str() {
 313                                 "Peer for first hop currently disconnected" => {},
 314                                 _ if err.starts_with("Cannot send less than our next-HTLC minimum - ") => {},
 315                                 _ if err.starts_with("Cannot send more than our next-HTLC maximum - ") => {},
 316                                 _ => panic!("{}", err),
 317                         }
 318                         assert!(sendable_bounds_violated);
 319                 },
 320                 APIError::MonitorUpdateInProgress => {
 321                         // We can (obviously) temp-fail a monitor update
 322                 },
 323                 APIError::IncompatibleShutdownScript { .. } => panic!("Cannot send an incompatible shutdown script"),
 324         }
 325 }
 326 #[inline]
 327 fn check_payment_err(send_err: PaymentSendFailure, sendable_bounds_violated: bool) {
 328         match send_err {
 329                 PaymentSendFailure::ParameterError(api_err) => check_api_err(api_err, sendable_bounds_violated),
 330                 PaymentSendFailure::PathParameterError(per_path_results) => {
 331                         for res in per_path_results { if let Err(api_err) = res { check_api_err(api_err, sendable_bounds_violated); } }
 332                 },
 333                 PaymentSendFailure::AllFailedResendSafe(per_path_results) => {
 334                         for api_err in per_path_results { check_api_err(api_err, sendable_bounds_violated); }
 335                 },
 336                 PaymentSendFailure::PartialFailure { results, .. } => {
 337                         for res in results { if let Err(api_err) = res { check_api_err(api_err, sendable_bounds_violated); } }
 338                 },
 339                 PaymentSendFailure::DuplicatePayment => panic!(),
 340         }
 341 }
 342
 343 type ChanMan<'a> = ChannelManager<Arc<TestChainMonitor>, Arc<TestBroadcaster>, Arc<KeyProvider>, Arc<KeyProvider>, Arc<KeyProvider>, Arc<FuzzEstimator>, &'a FuzzRouter, Arc<dyn Logger>>;
 344
 345 #[inline]
 346 fn get_payment_secret_hash(dest: &ChanMan, payment_id: &mut u8) -> Option<(PaymentSecret, PaymentHash)> {
 347         let mut payment_hash;
 348         for _ in 0..256 {
 349                 payment_hash = PaymentHash(Sha256::hash(&[*payment_id; 1]).into_inner());
 350                 if let Ok(payment_secret) = dest.create_inbound_payment_for_hash(payment_hash, None, 3600, None) {
 351                         return Some((payment_secret, payment_hash));
 352                 }
 353                 *payment_id = payment_id.wrapping_add(1);
 354         }
 355         None
 356 }
 357
 358 #[inline]
 359 fn send_payment(source: &ChanMan, dest: &ChanMan, dest_chan_id: u64, amt: u64, payment_id: &mut u8, payment_idx: &mut u64) -> bool {
 360         let (payment_secret, payment_hash) =
 361                 if let Some((secret, hash)) = get_payment_secret_hash(dest, payment_id) { (secret, hash) } else { return true; };
 362         let mut payment_id = [0; 32];
 363         payment_id[0..8].copy_from_slice(&payment_idx.to_ne_bytes());
 364         *payment_idx += 1;
 365         let (min_value_sendable, max_value_sendable) = source.list_usable_channels()
 366                 .iter().find(|chan| chan.short_channel_id == Some(dest_chan_id))
 367                 .map(|chan|
 368                         (chan.next_outbound_htlc_minimum_msat, chan.next_outbound_htlc_limit_msat))
 369                 .unwrap_or((0, 0));
 370         if let Err(err) = source.send_payment_with_route(&Route {
 371                 paths: vec![Path { hops: vec![RouteHop {
 372                         pubkey: dest.get_our_node_id(),
 373                         node_features: dest.node_features(),
 374                         short_channel_id: dest_chan_id,
 375                         channel_features: dest.channel_features(),
 376                         fee_msat: amt,
 377                         cltv_expiry_delta: 200,
 378                         maybe_announced_channel: true,
 379                 }], blinded_tail: None }],
 380                 route_params: None,
 381         }, payment_hash, RecipientOnionFields::secret_only(payment_secret), PaymentId(payment_id)) {
 382                 check_payment_err(err, amt > max_value_sendable || amt < min_value_sendable);
 383                 false
 384         } else {
 385                 // Note that while the max is a strict upper-bound, we can occasionally send substantially
 386                 // below the minimum, with some gap which is unusable immediately below the minimum. Thus,
 387                 // we don't check against min_value_sendable here.
 388                 assert!(amt <= max_value_sendable);
 389                 true
 390         }
 391 }
 392 #[inline]
 393 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 {
 394         let (payment_secret, payment_hash) =
 395                 if let Some((secret, hash)) = get_payment_secret_hash(dest, payment_id) { (secret, hash) } else { return true; };
 396         let mut payment_id = [0; 32];
 397         payment_id[0..8].copy_from_slice(&payment_idx.to_ne_bytes());
 398         *payment_idx += 1;
 399         let (min_value_sendable, max_value_sendable) = source.list_usable_channels()
 400                 .iter().find(|chan| chan.short_channel_id == Some(middle_chan_id))
 401                 .map(|chan|
 402                         (chan.next_outbound_htlc_minimum_msat, chan.next_outbound_htlc_limit_msat))
 403                 .unwrap_or((0, 0));
 404         let first_hop_fee = 50_000;
 405         if let Err(err) = source.send_payment_with_route(&Route {
 406                 paths: vec![Path { hops: vec![RouteHop {
 407                         pubkey: middle.get_our_node_id(),
 408                         node_features: middle.node_features(),
 409                         short_channel_id: middle_chan_id,
 410                         channel_features: middle.channel_features(),
 411                         fee_msat: first_hop_fee,
 412                         cltv_expiry_delta: 100,
 413                         maybe_announced_channel: true,
 414                 }, RouteHop {
 415                         pubkey: dest.get_our_node_id(),
 416                         node_features: dest.node_features(),
 417                         short_channel_id: dest_chan_id,
 418                         channel_features: dest.channel_features(),
 419                         fee_msat: amt,
 420                         cltv_expiry_delta: 200,
 421                         maybe_announced_channel: true,
 422                 }], blinded_tail: None }],
 423                 route_params: None,
 424         }, payment_hash, RecipientOnionFields::secret_only(payment_secret), PaymentId(payment_id)) {
 425                 let sent_amt = amt + first_hop_fee;
 426                 check_payment_err(err, sent_amt < min_value_sendable || sent_amt > max_value_sendable);
 427                 false
 428         } else {
 429                 // Note that while the max is a strict upper-bound, we can occasionally send substantially
 430                 // below the minimum, with some gap which is unusable immediately below the minimum. Thus,
 431                 // we don't check against min_value_sendable here.
 432                 assert!(amt + first_hop_fee <= max_value_sendable);
 433                 true
 434         }
 435 }
 436
 437 #[inline]
 438 pub fn do_test<Out: Output>(data: &[u8], underlying_out: Out) {
 439         let out = SearchingOutput::new(underlying_out);
 440         let broadcast = Arc::new(TestBroadcaster{});
 441         let router = FuzzRouter {};
 442
 443         macro_rules! make_node {
 444                 ($node_id: expr, $fee_estimator: expr) => { {
 445                         let logger: Arc<dyn Logger> = Arc::new(test_logger::TestLogger::new($node_id.to_string(), out.clone()));
 446                         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();
 447                         let keys_manager = Arc::new(KeyProvider { node_secret, rand_bytes_id: atomic::AtomicU32::new(0), enforcement_states: Mutex::new(HashMap::new()) });
 448                         let monitor = Arc::new(TestChainMonitor::new(broadcast.clone(), logger.clone(), $fee_estimator.clone(),
 449                                 Arc::new(TestPersister {
 450                                         update_ret: Mutex::new(ChannelMonitorUpdateStatus::Completed)
 451                                 }), Arc::clone(&keys_manager)));
 452
 453                         let mut config = UserConfig::default();
 454                         config.channel_config.forwarding_fee_proportional_millionths = 0;
 455                         config.channel_handshake_config.announced_channel = true;
 456                         let network = Network::Bitcoin;
 457                         let best_block_timestamp = genesis_block(network).header.time;
 458                         let params = ChainParameters {
 459                                 network,
 460                                 best_block: BestBlock::from_network(network),
 461                         };
 462                         (ChannelManager::new($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),
 463                         monitor, keys_manager)
 464                 } }
 465         }
 466
 467         macro_rules! reload_node {
 468                 ($ser: expr, $node_id: expr, $old_monitors: expr, $keys_manager: expr, $fee_estimator: expr) => { {
 469                     let keys_manager = Arc::clone(& $keys_manager);
 470                         let logger: Arc<dyn Logger> = Arc::new(test_logger::TestLogger::new($node_id.to_string(), out.clone()));
 471                         let chain_monitor = Arc::new(TestChainMonitor::new(broadcast.clone(), logger.clone(), $fee_estimator.clone(),
 472                                 Arc::new(TestPersister {
 473                                         update_ret: Mutex::new(ChannelMonitorUpdateStatus::Completed)
 474                                 }), Arc::clone(& $keys_manager)));
 475
 476                         let mut config = UserConfig::default();
 477                         config.channel_config.forwarding_fee_proportional_millionths = 0;
 478                         config.channel_handshake_config.announced_channel = true;
 479
 480                         let mut monitors = HashMap::new();
 481                         let mut old_monitors = $old_monitors.latest_monitors.lock().unwrap();
 482                         for (outpoint, (update_id, monitor_ser)) in old_monitors.drain() {
 483                                 monitors.insert(outpoint, <(BlockHash, ChannelMonitor<TestChannelSigner>)>::read(&mut Cursor::new(&monitor_ser), (&*$keys_manager, &*$keys_manager)).expect("Failed to read monitor").1);
 484                                 chain_monitor.latest_monitors.lock().unwrap().insert(outpoint, (update_id, monitor_ser));
 485                         }
 486                         let mut monitor_refs = HashMap::new();
 487                         for (outpoint, monitor) in monitors.iter_mut() {
 488                                 monitor_refs.insert(*outpoint, monitor);
 489                         }
 490
 491                         let read_args = ChannelManagerReadArgs {
 492                                 entropy_source: keys_manager.clone(),
 493                                 node_signer: keys_manager.clone(),
 494                                 signer_provider: keys_manager.clone(),
 495                                 fee_estimator: $fee_estimator.clone(),
 496                                 chain_monitor: chain_monitor.clone(),
 497                                 tx_broadcaster: broadcast.clone(),
 498                                 router: &router,
 499                                 logger,
 500                                 default_config: config,
 501                                 channel_monitors: monitor_refs,
 502                         };
 503
 504                         let res = (<(BlockHash, ChanMan)>::read(&mut Cursor::new(&$ser.0), read_args).expect("Failed to read manager").1, chain_monitor.clone());
 505                         for (funding_txo, mon) in monitors.drain() {
 506                                 assert_eq!(chain_monitor.chain_monitor.watch_channel(funding_txo, mon),
 507                                         ChannelMonitorUpdateStatus::Completed);
 508                         }
 509                         res
 510                 } }
 511         }
 512
 513         let mut channel_txn = Vec::new();
 514         macro_rules! make_channel {
 515                 ($source: expr, $dest: expr, $chan_id: expr) => { {
 516                         $source.peer_connected(&$dest.get_our_node_id(), &Init {
 517                                 features: $dest.init_features(), networks: None, remote_network_address: None
 518                         }, true).unwrap();
 519                         $dest.peer_connected(&$source.get_our_node_id(), &Init {
 520                                 features: $source.init_features(), networks: None, remote_network_address: None
 521                         }, false).unwrap();
 522
 523                         $source.create_channel($dest.get_our_node_id(), 100_000, 42, 0, None).unwrap();
 524                         let open_channel = {
 525                                 let events = $source.get_and_clear_pending_msg_events();
 526                                 assert_eq!(events.len(), 1);
 527                                 if let events::MessageSendEvent::SendOpenChannel { ref msg, .. } = events[0] {
 528                                         msg.clone()
 529                                 } else { panic!("Wrong event type"); }
 530                         };
 531
 532                         $dest.handle_open_channel(&$source.get_our_node_id(), &open_channel);
 533                         let accept_channel = {
 534                                 let events = $dest.get_and_clear_pending_msg_events();
 535                                 assert_eq!(events.len(), 1);
 536                                 if let events::MessageSendEvent::SendAcceptChannel { ref msg, .. } = events[0] {
 537                                         msg.clone()
 538                                 } else { panic!("Wrong event type"); }
 539                         };
 540
 541                         $source.handle_accept_channel(&$dest.get_our_node_id(), &accept_channel);
 542                         let funding_output;
 543                         {
 544                                 let events = $source.get_and_clear_pending_events();
 545                                 assert_eq!(events.len(), 1);
 546                                 if let events::Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, .. } = events[0] {
 547                                         let tx = Transaction { version: $chan_id, lock_time: PackedLockTime::ZERO, input: Vec::new(), output: vec![TxOut {
 548                                                 value: *channel_value_satoshis, script_pubkey: output_script.clone(),
 549                                         }]};
 550                                         funding_output = OutPoint { txid: tx.txid(), index: 0 };
 551                                         $source.funding_transaction_generated(&temporary_channel_id, &$dest.get_our_node_id(), tx.clone()).unwrap();
 552                                         channel_txn.push(tx);
 553                                 } else { panic!("Wrong event type"); }
 554                         }
 555
 556                         let funding_created = {
 557                                 let events = $source.get_and_clear_pending_msg_events();
 558                                 assert_eq!(events.len(), 1);
 559                                 if let events::MessageSendEvent::SendFundingCreated { ref msg, .. } = events[0] {
 560                                         msg.clone()
 561                                 } else { panic!("Wrong event type"); }
 562                         };
 563                         $dest.handle_funding_created(&$source.get_our_node_id(), &funding_created);
 564
 565                         let funding_signed = {
 566                                 let events = $dest.get_and_clear_pending_msg_events();
 567                                 assert_eq!(events.len(), 1);
 568                                 if let events::MessageSendEvent::SendFundingSigned { ref msg, .. } = events[0] {
 569                                         msg.clone()
 570                                 } else { panic!("Wrong event type"); }
 571                         };
 572                         let events = $dest.get_and_clear_pending_events();
 573                         assert_eq!(events.len(), 1);
 574                         if let events::Event::ChannelPending{ ref counterparty_node_id, .. } = events[0] {
 575                                 assert_eq!(counterparty_node_id, &$source.get_our_node_id());
 576                         } else { panic!("Wrong event type"); }
 577
 578                         $source.handle_funding_signed(&$dest.get_our_node_id(), &funding_signed);
 579                         let events = $source.get_and_clear_pending_events();
 580                         assert_eq!(events.len(), 1);
 581                         if let events::Event::ChannelPending{ ref counterparty_node_id, .. } = events[0] {
 582                                 assert_eq!(counterparty_node_id, &$dest.get_our_node_id());
 583                         } else { panic!("Wrong event type"); }
 584
 585                         funding_output
 586                 } }
 587         }
 588
 589         macro_rules! confirm_txn {
 590                 ($node: expr) => { {
 591                         let chain_hash = genesis_block(Network::Bitcoin).block_hash();
 592                         let mut header = create_dummy_header(chain_hash, 42);
 593                         let txdata: Vec<_> = channel_txn.iter().enumerate().map(|(i, tx)| (i + 1, tx)).collect();
 594                         $node.transactions_confirmed(&header, &txdata, 1);
 595                         for _ in 2..100 {
 596                                 header = create_dummy_header(header.block_hash(), 42);
 597                         }
 598                         $node.best_block_updated(&header, 99);
 599                 } }
 600         }
 601
 602         macro_rules! lock_fundings {
 603                 ($nodes: expr) => { {
 604                         let mut node_events = Vec::new();
 605                         for node in $nodes.iter() {
 606                                 node_events.push(node.get_and_clear_pending_msg_events());
 607                         }
 608                         for (idx, node_event) in node_events.iter().enumerate() {
 609                                 for event in node_event {
 610                                         if let events::MessageSendEvent::SendChannelReady { ref node_id, ref msg } = event {
 611                                                 for node in $nodes.iter() {
 612                                                         if node.get_our_node_id() == *node_id {
 613                                                                 node.handle_channel_ready(&$nodes[idx].get_our_node_id(), msg);
 614                                                         }
 615                                                 }
 616                                         } else { panic!("Wrong event type"); }
 617                                 }
 618                         }
 619
 620                         for node in $nodes.iter() {
 621                                 let events = node.get_and_clear_pending_msg_events();
 622                                 for event in events {
 623                                         if let events::MessageSendEvent::SendAnnouncementSignatures { .. } = event {
 624                                         } else { panic!("Wrong event type"); }
 625                                 }
 626                         }
 627                 } }
 628         }
 629
 630         let fee_est_a = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 631         let mut last_htlc_clear_fee_a =  253;
 632         let fee_est_b = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 633         let mut last_htlc_clear_fee_b =  253;
 634         let fee_est_c = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 635         let mut last_htlc_clear_fee_c =  253;
 636
 637         // 3 nodes is enough to hit all the possible cases, notably unknown-source-unknown-dest
 638         // forwarding.
 639         let (node_a, mut monitor_a, keys_manager_a) = make_node!(0, fee_est_a);
 640         let (node_b, mut monitor_b, keys_manager_b) = make_node!(1, fee_est_b);
 641         let (node_c, mut monitor_c, keys_manager_c) = make_node!(2, fee_est_c);
 642
 643         let mut nodes = [node_a, node_b, node_c];
 644
 645         let chan_1_funding = make_channel!(nodes[0], nodes[1], 0);
 646         let chan_2_funding = make_channel!(nodes[1], nodes[2], 1);
 647
 648         for node in nodes.iter() {
 649                 confirm_txn!(node);
 650         }
 651
 652         lock_fundings!(nodes);
 653
 654         let chan_a = nodes[0].list_usable_channels()[0].short_channel_id.unwrap();
 655         let chan_b = nodes[2].list_usable_channels()[0].short_channel_id.unwrap();
 656
 657         let mut payment_id: u8 = 0;
 658         let mut payment_idx: u64 = 0;
 659
 660         let mut chan_a_disconnected = false;
 661         let mut chan_b_disconnected = false;
 662         let mut ab_events = Vec::new();
 663         let mut ba_events = Vec::new();
 664         let mut bc_events = Vec::new();
 665         let mut cb_events = Vec::new();
 666
 667         let mut node_a_ser = VecWriter(Vec::new());
 668         nodes[0].write(&mut node_a_ser).unwrap();
 669         let mut node_b_ser = VecWriter(Vec::new());
 670         nodes[1].write(&mut node_b_ser).unwrap();
 671         let mut node_c_ser = VecWriter(Vec::new());
 672         nodes[2].write(&mut node_c_ser).unwrap();
 673
 674         macro_rules! test_return {
 675                 () => { {
 676                         assert_eq!(nodes[0].list_channels().len(), 1);
 677                         assert_eq!(nodes[1].list_channels().len(), 2);
 678                         assert_eq!(nodes[2].list_channels().len(), 1);
 679                         return;
 680                 } }
 681         }
 682
 683         let mut read_pos = 0;
 684         macro_rules! get_slice {
 685                 ($len: expr) => {
 686                         {
 687                                 let slice_len = $len as usize;
 688                                 if data.len() < read_pos + slice_len {
 689                                         test_return!();
 690                                 }
 691                                 read_pos += slice_len;
 692                                 &data[read_pos - slice_len..read_pos]
 693                         }
 694                 }
 695         }
 696
 697         loop {
 698                 // Push any events from Node B onto ba_events and bc_events
 699                 macro_rules! push_excess_b_events {
 700                         ($excess_events: expr, $expect_drop_node: expr) => { {
 701                                 let a_id = nodes[0].get_our_node_id();
 702                                 let expect_drop_node: Option<usize> = $expect_drop_node;
 703                                 let expect_drop_id = if let Some(id) = expect_drop_node { Some(nodes[id].get_our_node_id()) } else { None };
 704                                 for event in $excess_events {
 705                                         let push_a = match event {
 706                                                 events::MessageSendEvent::UpdateHTLCs { ref node_id, .. } => {
 707                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 708                                                         *node_id == a_id
 709                                                 },
 710                                                 events::MessageSendEvent::SendRevokeAndACK { ref node_id, .. } => {
 711                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 712                                                         *node_id == a_id
 713                                                 },
 714                                                 events::MessageSendEvent::SendChannelReestablish { ref node_id, .. } => {
 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                                                 events::MessageSendEvent::SendChannelReady { .. } => continue,
 719                                                 events::MessageSendEvent::SendAnnouncementSignatures { .. } => continue,
 720                                                 events::MessageSendEvent::SendChannelUpdate { ref node_id, ref msg } => {
 721                                                         assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 722                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 723                                                         *node_id == a_id
 724                                                 },
 725                                                 _ => panic!("Unhandled message event {:?}", event),
 726                                         };
 727                                         if push_a { ba_events.push(event); } else { bc_events.push(event); }
 728                                 }
 729                         } }
 730                 }
 731
 732                 // While delivering messages, we select across three possible message selection processes
 733                 // to ensure we get as much coverage as possible. See the individual enum variants for more
 734                 // details.
 735                 #[derive(PartialEq)]
 736                 enum ProcessMessages {
 737                         /// Deliver all available messages, including fetching any new messages from
 738                         /// `get_and_clear_pending_msg_events()` (which may have side effects).
 739                         AllMessages,
 740                         /// Call `get_and_clear_pending_msg_events()` first, and then deliver up to one
 741                         /// message (which may already be queued).
 742                         OneMessage,
 743                         /// Deliver up to one already-queued message. This avoids any potential side-effects
 744                         /// of `get_and_clear_pending_msg_events()` (eg freeing the HTLC holding cell), which
 745                         /// provides potentially more coverage.
 746                         OnePendingMessage,
 747                 }
 748
 749                 macro_rules! process_msg_events {
 750                         ($node: expr, $corrupt_forward: expr, $limit_events: expr) => { {
 751                                 let mut events = if $node == 1 {
 752                                         let mut new_events = Vec::new();
 753                                         mem::swap(&mut new_events, &mut ba_events);
 754                                         new_events.extend_from_slice(&bc_events[..]);
 755                                         bc_events.clear();
 756                                         new_events
 757                                 } else if $node == 0 {
 758                                         let mut new_events = Vec::new();
 759                                         mem::swap(&mut new_events, &mut ab_events);
 760                                         new_events
 761                                 } else {
 762                                         let mut new_events = Vec::new();
 763                                         mem::swap(&mut new_events, &mut cb_events);
 764                                         new_events
 765                                 };
 766                                 let mut new_events = Vec::new();
 767                                 if $limit_events != ProcessMessages::OnePendingMessage {
 768                                         new_events = nodes[$node].get_and_clear_pending_msg_events();
 769                                 }
 770                                 let mut had_events = false;
 771                                 let mut events_iter = events.drain(..).chain(new_events.drain(..));
 772                                 let mut extra_ev = None;
 773                                 for event in &mut events_iter {
 774                                         had_events = true;
 775                                         match event {
 776                                                 events::MessageSendEvent::UpdateHTLCs { node_id, updates: CommitmentUpdate { update_add_htlcs, update_fail_htlcs, update_fulfill_htlcs, update_fail_malformed_htlcs, update_fee, commitment_signed } } => {
 777                                                         for (idx, dest) in nodes.iter().enumerate() {
 778                                                                 if dest.get_our_node_id() == node_id {
 779                                                                         for update_add in update_add_htlcs.iter() {
 780                                                                                 out.locked_write(format!("Delivering update_add_htlc to node {}.\n", idx).as_bytes());
 781                                                                                 if !$corrupt_forward {
 782                                                                                         dest.handle_update_add_htlc(&nodes[$node].get_our_node_id(), update_add);
 783                                                                                 } else {
 784                                                                                         // Corrupt the update_add_htlc message so that its HMAC
 785                                                                                         // check will fail and we generate a
 786                                                                                         // update_fail_malformed_htlc instead of an
 787                                                                                         // update_fail_htlc as we do when we reject a payment.
 788                                                                                         let mut msg_ser = update_add.encode();
 789                                                                                         msg_ser[1000] ^= 0xff;
 790                                                                                         let new_msg = UpdateAddHTLC::read(&mut Cursor::new(&msg_ser)).unwrap();
 791                                                                                         dest.handle_update_add_htlc(&nodes[$node].get_our_node_id(), &new_msg);
 792                                                                                 }
 793                                                                         }
 794                                                                         for update_fulfill in update_fulfill_htlcs.iter() {
 795                                                                                 out.locked_write(format!("Delivering update_fulfill_htlc to node {}.\n", idx).as_bytes());
 796                                                                                 dest.handle_update_fulfill_htlc(&nodes[$node].get_our_node_id(), update_fulfill);
 797                                                                         }
 798                                                                         for update_fail in update_fail_htlcs.iter() {
 799                                                                                 out.locked_write(format!("Delivering update_fail_htlc to node {}.\n", idx).as_bytes());
 800                                                                                 dest.handle_update_fail_htlc(&nodes[$node].get_our_node_id(), update_fail);
 801                                                                         }
 802                                                                         for update_fail_malformed in update_fail_malformed_htlcs.iter() {
 803                                                                                 out.locked_write(format!("Delivering update_fail_malformed_htlc to node {}.\n", idx).as_bytes());
 804                                                                                 dest.handle_update_fail_malformed_htlc(&nodes[$node].get_our_node_id(), update_fail_malformed);
 805                                                                         }
 806                                                                         if let Some(msg) = update_fee {
 807                                                                                 out.locked_write(format!("Delivering update_fee to node {}.\n", idx).as_bytes());
 808                                                                                 dest.handle_update_fee(&nodes[$node].get_our_node_id(), &msg);
 809                                                                         }
 810                                                                         let processed_change = !update_add_htlcs.is_empty() || !update_fulfill_htlcs.is_empty() ||
 811                                                                                 !update_fail_htlcs.is_empty() || !update_fail_malformed_htlcs.is_empty();
 812                                                                         if $limit_events != ProcessMessages::AllMessages && processed_change {
 813                                                                                 // If we only want to process some messages, don't deliver the CS until later.
 814                                                                                 extra_ev = Some(events::MessageSendEvent::UpdateHTLCs { node_id, updates: CommitmentUpdate {
 815                                                                                         update_add_htlcs: Vec::new(),
 816                                                                                         update_fail_htlcs: Vec::new(),
 817                                                                                         update_fulfill_htlcs: Vec::new(),
 818                                                                                         update_fail_malformed_htlcs: Vec::new(),
 819                                                                                         update_fee: None,
 820                                                                                         commitment_signed
 821                                                                                 } });
 822                                                                                 break;
 823                                                                         }
 824                                                                         out.locked_write(format!("Delivering commitment_signed to node {}.\n", idx).as_bytes());
 825                                                                         dest.handle_commitment_signed(&nodes[$node].get_our_node_id(), &commitment_signed);
 826                                                                         break;
 827                                                                 }
 828                                                         }
 829                                                 },
 830                                                 events::MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
 831                                                         for (idx, dest) in nodes.iter().enumerate() {
 832                                                                 if dest.get_our_node_id() == *node_id {
 833                                                                         out.locked_write(format!("Delivering revoke_and_ack to node {}.\n", idx).as_bytes());
 834                                                                         dest.handle_revoke_and_ack(&nodes[$node].get_our_node_id(), msg);
 835                                                                 }
 836                                                         }
 837                                                 },
 838                                                 events::MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
 839                                                         for (idx, dest) in nodes.iter().enumerate() {
 840                                                                 if dest.get_our_node_id() == *node_id {
 841                                                                         out.locked_write(format!("Delivering channel_reestablish to node {}.\n", idx).as_bytes());
 842                                                                         dest.handle_channel_reestablish(&nodes[$node].get_our_node_id(), msg);
 843                                                                 }
 844                                                         }
 845                                                 },
 846                                                 events::MessageSendEvent::SendChannelReady { .. } => {
 847                                                         // Can be generated as a reestablish response
 848                                                 },
 849                                                 events::MessageSendEvent::SendAnnouncementSignatures { .. } => {
 850                                                         // Can be generated as a reestablish response
 851                                                 },
 852                                                 events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 853                                                         // When we reconnect we will resend a channel_update to make sure our
 854                                                         // counterparty has the latest parameters for receiving payments
 855                                                         // through us. We do, however, check that the message does not include
 856                                                         // the "disabled" bit, as we should never ever have a channel which is
 857                                                         // disabled when we send such an update (or it may indicate channel
 858                                                         // force-close which we should detect as an error).
 859                                                         assert_eq!(msg.contents.flags & 2, 0);
 860                                                 },
 861                                                 _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 862                                                         return;
 863                                                 } else {
 864                                                         panic!("Unhandled message event {:?}", event)
 865                                                 },
 866                                         }
 867                                         if $limit_events != ProcessMessages::AllMessages {
 868                                                 break;
 869                                         }
 870                                 }
 871                                 if $node == 1 {
 872                                         push_excess_b_events!(extra_ev.into_iter().chain(events_iter), None);
 873                                 } else if $node == 0 {
 874                                         if let Some(ev) = extra_ev { ab_events.push(ev); }
 875                                         for event in events_iter { ab_events.push(event); }
 876                                 } else {
 877                                         if let Some(ev) = extra_ev { cb_events.push(ev); }
 878                                         for event in events_iter { cb_events.push(event); }
 879                                 }
 880                                 had_events
 881                         } }
 882                 }
 883
 884                 macro_rules! drain_msg_events_on_disconnect {
 885                         ($counterparty_id: expr) => { {
 886                                 if $counterparty_id == 0 {
 887                                         for event in nodes[0].get_and_clear_pending_msg_events() {
 888                                                 match event {
 889                                                         events::MessageSendEvent::UpdateHTLCs { .. } => {},
 890                                                         events::MessageSendEvent::SendRevokeAndACK { .. } => {},
 891                                                         events::MessageSendEvent::SendChannelReestablish { .. } => {},
 892                                                         events::MessageSendEvent::SendChannelReady { .. } => {},
 893                                                         events::MessageSendEvent::SendAnnouncementSignatures { .. } => {},
 894                                                         events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 895                                                                 assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 896                                                         },
 897                                                         _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 898                                                                 return;
 899                                                         } else {
 900                                                                 panic!("Unhandled message event")
 901                                                         },
 902                                                 }
 903                                         }
 904                                         push_excess_b_events!(nodes[1].get_and_clear_pending_msg_events().drain(..), Some(0));
 905                                         ab_events.clear();
 906                                         ba_events.clear();
 907                                 } else {
 908                                         for event in nodes[2].get_and_clear_pending_msg_events() {
 909                                                 match event {
 910                                                         events::MessageSendEvent::UpdateHTLCs { .. } => {},
 911                                                         events::MessageSendEvent::SendRevokeAndACK { .. } => {},
 912                                                         events::MessageSendEvent::SendChannelReestablish { .. } => {},
 913                                                         events::MessageSendEvent::SendChannelReady { .. } => {},
 914                                                         events::MessageSendEvent::SendAnnouncementSignatures { .. } => {},
 915                                                         events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 916                                                                 assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 917                                                         },
 918                                                         _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 919                                                                 return;
 920                                                         } else {
 921                                                                 panic!("Unhandled message event")
 922                                                         },
 923                                                 }
 924                                         }
 925                                         push_excess_b_events!(nodes[1].get_and_clear_pending_msg_events().drain(..), Some(2));
 926                                         bc_events.clear();
 927                                         cb_events.clear();
 928                                 }
 929                         } }
 930                 }
 931
 932                 macro_rules! process_events {
 933                         ($node: expr, $fail: expr) => { {
 934                                 // In case we get 256 payments we may have a hash collision, resulting in the
 935                                 // second claim/fail call not finding the duplicate-hash HTLC, so we have to
 936                                 // deduplicate the calls here.
 937                                 let mut claim_set = HashSet::new();
 938                                 let mut events = nodes[$node].get_and_clear_pending_events();
 939                                 // Sort events so that PendingHTLCsForwardable get processed last. This avoids a
 940                                 // case where we first process a PendingHTLCsForwardable, then claim/fail on a
 941                                 // PaymentClaimable, claiming/failing two HTLCs, but leaving a just-generated
 942                                 // PaymentClaimable event for the second HTLC in our pending_events (and breaking
 943                                 // our claim_set deduplication).
 944                                 events.sort_by(|a, b| {
 945                                         if let events::Event::PaymentClaimable { .. } = a {
 946                                                 if let events::Event::PendingHTLCsForwardable { .. } = b {
 947                                                         Ordering::Less
 948                                                 } else { Ordering::Equal }
 949                                         } else if let events::Event::PendingHTLCsForwardable { .. } = a {
 950                                                 if let events::Event::PaymentClaimable { .. } = b {
 951                                                         Ordering::Greater
 952                                                 } else { Ordering::Equal }
 953                                         } else { Ordering::Equal }
 954                                 });
 955                                 let had_events = !events.is_empty();
 956                                 for event in events.drain(..) {
 957                                         match event {
 958                                                 events::Event::PaymentClaimable { payment_hash, .. } => {
 959                                                         if claim_set.insert(payment_hash.0) {
 960                                                                 if $fail {
 961                                                                         nodes[$node].fail_htlc_backwards(&payment_hash);
 962                                                                 } else {
 963                                                                         nodes[$node].claim_funds(PaymentPreimage(payment_hash.0));
 964                                                                 }
 965                                                         }
 966                                                 },
 967                                                 events::Event::PaymentSent { .. } => {},
 968                                                 events::Event::PaymentClaimed { .. } => {},
 969                                                 events::Event::PaymentPathSuccessful { .. } => {},
 970                                                 events::Event::PaymentPathFailed { .. } => {},
 971                                                 events::Event::PaymentFailed { .. } => {},
 972                                                 events::Event::ProbeSuccessful { .. } | events::Event::ProbeFailed { .. } => {
 973                                                         // Even though we don't explicitly send probes, because probes are
 974                                                         // detected based on hashing the payment hash+preimage, its rather
 975                                                         // trivial for the fuzzer to build payments that accidentally end up
 976                                                         // looking like probes.
 977                                                 },
 978                                                 events::Event::PaymentForwarded { .. } if $node == 1 => {},
 979                                                 events::Event::ChannelReady { .. } => {},
 980                                                 events::Event::PendingHTLCsForwardable { .. } => {
 981                                                         nodes[$node].process_pending_htlc_forwards();
 982                                                 },
 983                                                 events::Event::HTLCHandlingFailed { .. } => {},
 984                                                 _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 985                                                         return;
 986                                                 } else {
 987                                                         panic!("Unhandled event")
 988                                                 },
 989                                         }
 990                                 }
 991                                 had_events
 992                         } }
 993                 }
 994
 995                 let v = get_slice!(1)[0];
 996                 out.locked_write(format!("READ A BYTE! HANDLING INPUT {:x}...........\n", v).as_bytes());
 997                 match v {
 998                         // In general, we keep related message groups close together in binary form, allowing
 999                         // bit-twiddling mutations to have similar effects. This is probably overkill, but no
1000                         // harm in doing so.
1001
1002                         0x00 => *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
1003                         0x01 => *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
1004                         0x02 => *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
1005                         0x04 => *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
1006                         0x05 => *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
1007                         0x06 => *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
1008
1009                         0x08 => {
1010                                 if let Some((id, _)) = monitor_a.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1011                                         monitor_a.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
1012                                         nodes[0].process_monitor_events();
1013                                 }
1014                         },
1015                         0x09 => {
1016                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1017                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
1018                                         nodes[1].process_monitor_events();
1019                                 }
1020                         },
1021                         0x0a => {
1022                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1023                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1024                                         nodes[1].process_monitor_events();
1025                                 }
1026                         },
1027                         0x0b => {
1028                                 if let Some((id, _)) = monitor_c.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1029                                         monitor_c.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1030                                         nodes[2].process_monitor_events();
1031                                 }
1032                         },
1033
1034                         0x0c => {
1035                                 if !chan_a_disconnected {
1036                                         nodes[0].peer_disconnected(&nodes[1].get_our_node_id());
1037                                         nodes[1].peer_disconnected(&nodes[0].get_our_node_id());
1038                                         chan_a_disconnected = true;
1039                                         drain_msg_events_on_disconnect!(0);
1040                                 }
1041                         },
1042                         0x0d => {
1043                                 if !chan_b_disconnected {
1044                                         nodes[1].peer_disconnected(&nodes[2].get_our_node_id());
1045                                         nodes[2].peer_disconnected(&nodes[1].get_our_node_id());
1046                                         chan_b_disconnected = true;
1047                                         drain_msg_events_on_disconnect!(2);
1048                                 }
1049                         },
1050                         0x0e => {
1051                                 if chan_a_disconnected {
1052                                         nodes[0].peer_connected(&nodes[1].get_our_node_id(), &Init {
1053                                                 features: nodes[1].init_features(), networks: None, remote_network_address: None
1054                                         }, true).unwrap();
1055                                         nodes[1].peer_connected(&nodes[0].get_our_node_id(), &Init {
1056                                                 features: nodes[0].init_features(), networks: None, remote_network_address: None
1057                                         }, false).unwrap();
1058                                         chan_a_disconnected = false;
1059                                 }
1060                         },
1061                         0x0f => {
1062                                 if chan_b_disconnected {
1063                                         nodes[1].peer_connected(&nodes[2].get_our_node_id(), &Init {
1064                                                 features: nodes[2].init_features(), networks: None, remote_network_address: None
1065                                         }, true).unwrap();
1066                                         nodes[2].peer_connected(&nodes[1].get_our_node_id(), &Init {
1067                                                 features: nodes[1].init_features(), networks: None, remote_network_address: None
1068                                         }, false).unwrap();
1069                                         chan_b_disconnected = false;
1070                                 }
1071                         },
1072
1073                         0x10 => { process_msg_events!(0, true, ProcessMessages::AllMessages); },
1074                         0x11 => { process_msg_events!(0, false, ProcessMessages::AllMessages); },
1075                         0x12 => { process_msg_events!(0, true, ProcessMessages::OneMessage); },
1076                         0x13 => { process_msg_events!(0, false, ProcessMessages::OneMessage); },
1077                         0x14 => { process_msg_events!(0, true, ProcessMessages::OnePendingMessage); },
1078                         0x15 => { process_msg_events!(0, false, ProcessMessages::OnePendingMessage); },
1079
1080                         0x16 => { process_events!(0, true); },
1081                         0x17 => { process_events!(0, false); },
1082
1083                         0x18 => { process_msg_events!(1, true, ProcessMessages::AllMessages); },
1084                         0x19 => { process_msg_events!(1, false, ProcessMessages::AllMessages); },
1085                         0x1a => { process_msg_events!(1, true, ProcessMessages::OneMessage); },
1086                         0x1b => { process_msg_events!(1, false, ProcessMessages::OneMessage); },
1087                         0x1c => { process_msg_events!(1, true, ProcessMessages::OnePendingMessage); },
1088                         0x1d => { process_msg_events!(1, false, ProcessMessages::OnePendingMessage); },
1089
1090                         0x1e => { process_events!(1, true); },
1091                         0x1f => { process_events!(1, false); },
1092
1093                         0x20 => { process_msg_events!(2, true, ProcessMessages::AllMessages); },
1094                         0x21 => { process_msg_events!(2, false, ProcessMessages::AllMessages); },
1095                         0x22 => { process_msg_events!(2, true, ProcessMessages::OneMessage); },
1096                         0x23 => { process_msg_events!(2, false, ProcessMessages::OneMessage); },
1097                         0x24 => { process_msg_events!(2, true, ProcessMessages::OnePendingMessage); },
1098                         0x25 => { process_msg_events!(2, false, ProcessMessages::OnePendingMessage); },
1099
1100                         0x26 => { process_events!(2, true); },
1101                         0x27 => { process_events!(2, false); },
1102
1103                         0x2c => {
1104                                 if !chan_a_disconnected {
1105                                         nodes[1].peer_disconnected(&nodes[0].get_our_node_id());
1106                                         chan_a_disconnected = true;
1107                                         drain_msg_events_on_disconnect!(0);
1108                                 }
1109                                 if monitor_a.should_update_manager.load(atomic::Ordering::Relaxed) {
1110                                         node_a_ser.0.clear();
1111                                         nodes[0].write(&mut node_a_ser).unwrap();
1112                                 }
1113                                 let (new_node_a, new_monitor_a) = reload_node!(node_a_ser, 0, monitor_a, keys_manager_a, fee_est_a);
1114                                 nodes[0] = new_node_a;
1115                                 monitor_a = new_monitor_a;
1116                         },
1117                         0x2d => {
1118                                 if !chan_a_disconnected {
1119                                         nodes[0].peer_disconnected(&nodes[1].get_our_node_id());
1120                                         chan_a_disconnected = true;
1121                                         nodes[0].get_and_clear_pending_msg_events();
1122                                         ab_events.clear();
1123                                         ba_events.clear();
1124                                 }
1125                                 if !chan_b_disconnected {
1126                                         nodes[2].peer_disconnected(&nodes[1].get_our_node_id());
1127                                         chan_b_disconnected = true;
1128                                         nodes[2].get_and_clear_pending_msg_events();
1129                                         bc_events.clear();
1130                                         cb_events.clear();
1131                                 }
1132                                 let (new_node_b, new_monitor_b) = reload_node!(node_b_ser, 1, monitor_b, keys_manager_b, fee_est_b);
1133                                 nodes[1] = new_node_b;
1134                                 monitor_b = new_monitor_b;
1135                         },
1136                         0x2e => {
1137                                 if !chan_b_disconnected {
1138                                         nodes[1].peer_disconnected(&nodes[2].get_our_node_id());
1139                                         chan_b_disconnected = true;
1140                                         drain_msg_events_on_disconnect!(2);
1141                                 }
1142                                 if monitor_c.should_update_manager.load(atomic::Ordering::Relaxed) {
1143                                         node_c_ser.0.clear();
1144                                         nodes[2].write(&mut node_c_ser).unwrap();
1145                                 }
1146                                 let (new_node_c, new_monitor_c) = reload_node!(node_c_ser, 2, monitor_c, keys_manager_c, fee_est_c);
1147                                 nodes[2] = new_node_c;
1148                                 monitor_c = new_monitor_c;
1149                         },
1150
1151                         // 1/10th the channel size:
1152                         0x30 => { send_payment(&nodes[0], &nodes[1], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1153                         0x31 => { send_payment(&nodes[1], &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1154                         0x32 => { send_payment(&nodes[1], &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1155                         0x33 => { send_payment(&nodes[2], &nodes[1], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1156                         0x34 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1157                         0x35 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1158
1159                         0x38 => { send_payment(&nodes[0], &nodes[1], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1160                         0x39 => { send_payment(&nodes[1], &nodes[0], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1161                         0x3a => { send_payment(&nodes[1], &nodes[2], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1162                         0x3b => { send_payment(&nodes[2], &nodes[1], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1163                         0x3c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1164                         0x3d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1165
1166                         0x40 => { send_payment(&nodes[0], &nodes[1], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1167                         0x41 => { send_payment(&nodes[1], &nodes[0], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1168                         0x42 => { send_payment(&nodes[1], &nodes[2], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1169                         0x43 => { send_payment(&nodes[2], &nodes[1], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1170                         0x44 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1171                         0x45 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1172
1173                         0x48 => { send_payment(&nodes[0], &nodes[1], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1174                         0x49 => { send_payment(&nodes[1], &nodes[0], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1175                         0x4a => { send_payment(&nodes[1], &nodes[2], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1176                         0x4b => { send_payment(&nodes[2], &nodes[1], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1177                         0x4c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1178                         0x4d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1179
1180                         0x50 => { send_payment(&nodes[0], &nodes[1], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1181                         0x51 => { send_payment(&nodes[1], &nodes[0], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1182                         0x52 => { send_payment(&nodes[1], &nodes[2], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1183                         0x53 => { send_payment(&nodes[2], &nodes[1], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1184                         0x54 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1185                         0x55 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1186
1187                         0x58 => { send_payment(&nodes[0], &nodes[1], chan_a, 100, &mut payment_id, &mut payment_idx); },
1188                         0x59 => { send_payment(&nodes[1], &nodes[0], chan_a, 100, &mut payment_id, &mut payment_idx); },
1189                         0x5a => { send_payment(&nodes[1], &nodes[2], chan_b, 100, &mut payment_id, &mut payment_idx); },
1190                         0x5b => { send_payment(&nodes[2], &nodes[1], chan_b, 100, &mut payment_id, &mut payment_idx); },
1191                         0x5c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 100, &mut payment_id, &mut payment_idx); },
1192                         0x5d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 100, &mut payment_id, &mut payment_idx); },
1193
1194                         0x60 => { send_payment(&nodes[0], &nodes[1], chan_a, 10, &mut payment_id, &mut payment_idx); },
1195                         0x61 => { send_payment(&nodes[1], &nodes[0], chan_a, 10, &mut payment_id, &mut payment_idx); },
1196                         0x62 => { send_payment(&nodes[1], &nodes[2], chan_b, 10, &mut payment_id, &mut payment_idx); },
1197                         0x63 => { send_payment(&nodes[2], &nodes[1], chan_b, 10, &mut payment_id, &mut payment_idx); },
1198                         0x64 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10, &mut payment_id, &mut payment_idx); },
1199                         0x65 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10, &mut payment_id, &mut payment_idx); },
1200
1201                         0x68 => { send_payment(&nodes[0], &nodes[1], chan_a, 1, &mut payment_id, &mut payment_idx); },
1202                         0x69 => { send_payment(&nodes[1], &nodes[0], chan_a, 1, &mut payment_id, &mut payment_idx); },
1203                         0x6a => { send_payment(&nodes[1], &nodes[2], chan_b, 1, &mut payment_id, &mut payment_idx); },
1204                         0x6b => { send_payment(&nodes[2], &nodes[1], chan_b, 1, &mut payment_id, &mut payment_idx); },
1205                         0x6c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1, &mut payment_id, &mut payment_idx); },
1206                         0x6d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1, &mut payment_id, &mut payment_idx); },
1207
1208                         0x80 => {
1209                                 let max_feerate = last_htlc_clear_fee_a * FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1210                                 if fee_est_a.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1211                                         fee_est_a.ret_val.store(max_feerate, atomic::Ordering::Release);
1212                                 }
1213                                 nodes[0].maybe_update_chan_fees();
1214                         },
1215                         0x81 => { fee_est_a.ret_val.store(253, atomic::Ordering::Release); nodes[0].maybe_update_chan_fees(); },
1216
1217                         0x84 => {
1218                                 let max_feerate = last_htlc_clear_fee_b * FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1219                                 if fee_est_b.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1220                                         fee_est_b.ret_val.store(max_feerate, atomic::Ordering::Release);
1221                                 }
1222                                 nodes[1].maybe_update_chan_fees();
1223                         },
1224                         0x85 => { fee_est_b.ret_val.store(253, atomic::Ordering::Release); nodes[1].maybe_update_chan_fees(); },
1225
1226                         0x88 => {
1227                                 let max_feerate = last_htlc_clear_fee_c * FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1228                                 if fee_est_c.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1229                                         fee_est_c.ret_val.store(max_feerate, atomic::Ordering::Release);
1230                                 }
1231                                 nodes[2].maybe_update_chan_fees();
1232                         },
1233                         0x89 => { fee_est_c.ret_val.store(253, atomic::Ordering::Release); nodes[2].maybe_update_chan_fees(); },
1234
1235                         0xff => {
1236                                 // Test that no channel is in a stuck state where neither party can send funds even
1237                                 // after we resolve all pending events.
1238                                 // First make sure there are no pending monitor updates, resetting the error state
1239                                 // and calling force_channel_monitor_updated for each monitor.
1240                                 *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1241                                 *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1242                                 *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1243
1244                                 if let Some((id, _)) = monitor_a.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1245                                         monitor_a.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
1246                                         nodes[0].process_monitor_events();
1247                                 }
1248                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1249                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
1250                                         nodes[1].process_monitor_events();
1251                                 }
1252                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1253                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1254                                         nodes[1].process_monitor_events();
1255                                 }
1256                                 if let Some((id, _)) = monitor_c.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1257                                         monitor_c.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1258                                         nodes[2].process_monitor_events();
1259                                 }
1260
1261                                 // Next, make sure peers are all connected to each other
1262                                 if chan_a_disconnected {
1263                                         nodes[0].peer_connected(&nodes[1].get_our_node_id(), &Init {
1264                                                 features: nodes[1].init_features(), networks: None, remote_network_address: None
1265                                         }, true).unwrap();
1266                                         nodes[1].peer_connected(&nodes[0].get_our_node_id(), &Init {
1267                                                 features: nodes[0].init_features(), networks: None, remote_network_address: None
1268                                         }, false).unwrap();
1269                                         chan_a_disconnected = false;
1270                                 }
1271                                 if chan_b_disconnected {
1272                                         nodes[1].peer_connected(&nodes[2].get_our_node_id(), &Init {
1273                                                 features: nodes[2].init_features(), networks: None, remote_network_address: None
1274                                         }, true).unwrap();
1275                                         nodes[2].peer_connected(&nodes[1].get_our_node_id(), &Init {
1276                                                 features: nodes[1].init_features(), networks: None, remote_network_address: None
1277                                         }, false).unwrap();
1278                                         chan_b_disconnected = false;
1279                                 }
1280
1281                                 for i in 0..std::usize::MAX {
1282                                         if i == 100 { panic!("It may take may iterations to settle the state, but it should not take forever"); }
1283                                         // Then, make sure any current forwards make their way to their destination
1284                                         if process_msg_events!(0, false, ProcessMessages::AllMessages) { continue; }
1285                                         if process_msg_events!(1, false, ProcessMessages::AllMessages) { continue; }
1286                                         if process_msg_events!(2, false, ProcessMessages::AllMessages) { continue; }
1287                                         // ...making sure any pending PendingHTLCsForwardable events are handled and
1288                                         // payments claimed.
1289                                         if process_events!(0, false) { continue; }
1290                                         if process_events!(1, false) { continue; }
1291                                         if process_events!(2, false) { continue; }
1292                                         break;
1293                                 }
1294
1295                                 // Finally, make sure that at least one end of each channel can make a substantial payment
1296                                 assert!(
1297                                         send_payment(&nodes[0], &nodes[1], chan_a, 10_000_000, &mut payment_id, &mut payment_idx) ||
1298                                         send_payment(&nodes[1], &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx));
1299                                 assert!(
1300                                         send_payment(&nodes[1], &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx) ||
1301                                         send_payment(&nodes[2], &nodes[1], chan_b, 10_000_000, &mut payment_id, &mut payment_idx));
1302
1303                                 last_htlc_clear_fee_a = fee_est_a.ret_val.load(atomic::Ordering::Acquire);
1304                                 last_htlc_clear_fee_b = fee_est_b.ret_val.load(atomic::Ordering::Acquire);
1305                                 last_htlc_clear_fee_c = fee_est_c.ret_val.load(atomic::Ordering::Acquire);
1306                         },
1307                         _ => test_return!(),
1308                 }
1309
1310                 node_a_ser.0.clear();
1311                 nodes[0].write(&mut node_a_ser).unwrap();
1312                 monitor_a.should_update_manager.store(false, atomic::Ordering::Relaxed);
1313                 node_b_ser.0.clear();
1314                 nodes[1].write(&mut node_b_ser).unwrap();
1315                 monitor_b.should_update_manager.store(false, atomic::Ordering::Relaxed);
1316                 node_c_ser.0.clear();
1317                 nodes[2].write(&mut node_c_ser).unwrap();
1318                 monitor_c.should_update_manager.store(false, atomic::Ordering::Relaxed);
1319         }
1320 }
1321
1322 /// We actually have different behavior based on if a certain log string has been seen, so we have
1323 /// to do a bit more tracking.
1324 #[derive(Clone)]
1325 struct SearchingOutput<O: Output> {
1326         output: O,
1327         may_fail: Arc<atomic::AtomicBool>,
1328 }
1329 impl<O: Output> Output for SearchingOutput<O> {
1330         fn locked_write(&self, data: &[u8]) {
1331                 // We hit a design limitation of LN state machine (see CONCURRENT_INBOUND_HTLC_FEE_BUFFER)
1332                 if std::str::from_utf8(data).unwrap().contains("Outbound update_fee HTLC buffer overflow - counterparty should force-close this channel") {
1333                         self.may_fail.store(true, atomic::Ordering::Release);
1334                 }
1335                 self.output.locked_write(data)
1336         }
1337 }
1338 impl<O: Output> SearchingOutput<O> {
1339         pub fn new(output: O) -> Self {
1340                 Self { output, may_fail: Arc::new(atomic::AtomicBool::new(false)) }
1341         }
1342 }
1343
1344 pub fn chanmon_consistency_test<Out: Output>(data: &[u8], out: Out) {
1345         do_test(data, out);
1346 }
1347
1348 #[no_mangle]
1349 pub extern "C" fn chanmon_consistency_run(data: *const u8, datalen: usize) {
1350         do_test(unsafe { std::slice::from_raw_parts(data, datalen) }, test_logger::DevNull{});
1351 }