_ 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, ScriptBuf};
  24 use bitcoin::blockdata::opcodes;
  25 use bitcoin::blockdata::locktime::absolute::LockTime;
  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::blinded_path::BlindedPath;
  34 use lightning::blinded_path::message::ForwardNode;
  35 use lightning::blinded_path::payment::ReceiveTlvs;
  36 use lightning::chain;
  37 use lightning::chain::{BestBlock, ChannelMonitorUpdateStatus, chainmonitor, channelmonitor, Confirm, Watch};
  38 use lightning::chain::channelmonitor::{ChannelMonitor, MonitorEvent};
  39 use lightning::chain::transaction::OutPoint;
  40 use lightning::chain::chaininterface::{BroadcasterInterface, ConfirmationTarget, FeeEstimator};
  41 use lightning::sign::{KeyMaterial, InMemorySigner, Recipient, EntropySource, NodeSigner, SignerProvider};
  42 use lightning::events;
  43 use lightning::events::MessageSendEventsProvider;
  44 use lightning::ln::{ChannelId, PaymentHash, PaymentPreimage, PaymentSecret};
  45 use lightning::ln::channelmanager::{ChainParameters, ChannelDetails, ChannelManager, PaymentSendFailure, ChannelManagerReadArgs, PaymentId, RecipientOnionFields};
  46 use lightning::ln::channel::FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE;
  47 use lightning::ln::msgs::{self, CommitmentUpdate, ChannelMessageHandler, DecodeError, UpdateAddHTLC, Init};
  48 use lightning::ln::script::ShutdownScript;
  49 use lightning::ln::functional_test_utils::*;
  50 use lightning::offers::invoice::{BlindedPayInfo, UnsignedBolt12Invoice};
  51 use lightning::offers::invoice_request::UnsignedInvoiceRequest;
  52 use lightning::onion_message::messenger::{Destination, MessageRouter, OnionMessagePath};
  53 use lightning::util::test_channel_signer::{TestChannelSigner, EnforcementState};
  54 use lightning::util::errors::APIError;
  55 use lightning::util::hash_tables::*;
  56 use lightning::util::logger::Logger;
  57 use lightning::util::config::UserConfig;
  58 use lightning::util::ser::{Readable, ReadableArgs, Writeable, Writer};
  59 use lightning::routing::router::{InFlightHtlcs, Path, Route, RouteHop, RouteParameters, Router};
  60
  61 use crate::utils::test_logger::{self, Output};
  62 use crate::utils::test_persister::TestPersister;
  63
  64 use bitcoin::secp256k1::{Message, PublicKey, SecretKey, Scalar, Secp256k1, self};
  65 use bitcoin::secp256k1::ecdh::SharedSecret;
  66 use bitcoin::secp256k1::ecdsa::{RecoverableSignature, Signature};
  67 use bitcoin::secp256k1::schnorr;
  68
  69 use std::mem;
  70 use std::cmp::{self, Ordering};
  71 use std::sync::{Arc,Mutex};
  72 use std::sync::atomic;
  73 use std::io::Cursor;
  74 use bitcoin::bech32::u5;
  75
  76 const MAX_FEE: u32 = 10_000;
  77 struct FuzzEstimator {
  78         ret_val: atomic::AtomicU32,
  79 }
  80 impl FeeEstimator for FuzzEstimator {
  81         fn get_est_sat_per_1000_weight(&self, conf_target: ConfirmationTarget) -> u32 {
  82                 // We force-close channels if our counterparty sends us a feerate which is a small multiple
  83                 // of our HighPriority fee estimate or smaller than our Background fee estimate. Thus, we
  84                 // always return a HighPriority feerate here which is >= the maximum Normal feerate and a
  85                 // Background feerate which is <= the minimum Normal feerate.
  86                 match conf_target {
  87                         ConfirmationTarget::OnChainSweep => MAX_FEE,
  88                         ConfirmationTarget::ChannelCloseMinimum|ConfirmationTarget::AnchorChannelFee|ConfirmationTarget::MinAllowedAnchorChannelRemoteFee|ConfirmationTarget::MinAllowedNonAnchorChannelRemoteFee|ConfirmationTarget::OutputSpendingFee => 253,
  89                         ConfirmationTarget::NonAnchorChannelFee => cmp::min(self.ret_val.load(atomic::Ordering::Acquire), MAX_FEE),
  90                 }
  91         }
  92 }
  93
  94 struct FuzzRouter {}
  95
  96 impl Router for FuzzRouter {
  97         fn find_route(
  98                 &self, _payer: &PublicKey, _params: &RouteParameters, _first_hops: Option<&[&ChannelDetails]>,
  99                 _inflight_htlcs: InFlightHtlcs
 100         ) -> Result<Route, msgs::LightningError> {
 101                 Err(msgs::LightningError {
 102                         err: String::from("Not implemented"),
 103                         action: msgs::ErrorAction::IgnoreError
 104                 })
 105         }
 106
 107         fn create_blinded_payment_paths<T: secp256k1::Signing + secp256k1::Verification>(
 108                 &self, _recipient: PublicKey, _first_hops: Vec<ChannelDetails>, _tlvs: ReceiveTlvs,
 109                 _amount_msats: u64, _secp_ctx: &Secp256k1<T>,
 110         ) -> Result<Vec<(BlindedPayInfo, BlindedPath)>, ()> {
 111                 unreachable!()
 112         }
 113 }
 114
 115 impl MessageRouter for FuzzRouter {
 116         fn find_path(
 117                 &self, _sender: PublicKey, _peers: Vec<PublicKey>, _destination: Destination
 118         ) -> Result<OnionMessagePath, ()> {
 119                 unreachable!()
 120         }
 121
 122         fn create_blinded_paths<T: secp256k1::Signing + secp256k1::Verification>(
 123                 &self, _recipient: PublicKey, _peers: Vec<ForwardNode>, _secp_ctx: &Secp256k1<T>,
 124         ) -> Result<Vec<BlindedPath>, ()> {
 125                 unreachable!()
 126         }
 127 }
 128
 129 pub struct TestBroadcaster {}
 130 impl BroadcasterInterface for TestBroadcaster {
 131         fn broadcast_transactions(&self, _txs: &[&Transaction]) { }
 132 }
 133
 134 pub struct VecWriter(pub Vec<u8>);
 135 impl Writer for VecWriter {
 136         fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
 137                 self.0.extend_from_slice(buf);
 138                 Ok(())
 139         }
 140 }
 141
 142 struct TestChainMonitor {
 143         pub logger: Arc<dyn Logger>,
 144         pub keys: Arc<KeyProvider>,
 145         pub persister: Arc<TestPersister>,
 146         pub chain_monitor: Arc<chainmonitor::ChainMonitor<TestChannelSigner, Arc<dyn chain::Filter>, Arc<TestBroadcaster>, Arc<FuzzEstimator>, Arc<dyn Logger>, Arc<TestPersister>>>,
 147         // If we reload a node with an old copy of ChannelMonitors, the ChannelManager deserialization
 148         // logic will automatically force-close our channels for us (as we don't have an up-to-date
 149         // monitor implying we are not able to punish misbehaving counterparties). Because this test
 150         // "fails" if we ever force-close a channel, we avoid doing so, always saving the latest
 151         // fully-serialized monitor state here, as well as the corresponding update_id.
 152         pub latest_monitors: Mutex<HashMap<OutPoint, (u64, Vec<u8>)>>,
 153 }
 154 impl TestChainMonitor {
 155         pub fn new(broadcaster: Arc<TestBroadcaster>, logger: Arc<dyn Logger>, feeest: Arc<FuzzEstimator>, persister: Arc<TestPersister>, keys: Arc<KeyProvider>) -> Self {
 156                 Self {
 157                         chain_monitor: Arc::new(chainmonitor::ChainMonitor::new(None, broadcaster, logger.clone(), feeest, Arc::clone(&persister))),
 158                         logger,
 159                         keys,
 160                         persister,
 161                         latest_monitors: Mutex::new(new_hash_map()),
 162                 }
 163         }
 164 }
 165 impl chain::Watch<TestChannelSigner> for TestChainMonitor {
 166         fn watch_channel(&self, funding_txo: OutPoint, monitor: channelmonitor::ChannelMonitor<TestChannelSigner>) -> Result<chain::ChannelMonitorUpdateStatus, ()> {
 167                 let mut ser = VecWriter(Vec::new());
 168                 monitor.write(&mut ser).unwrap();
 169                 if let Some(_) = self.latest_monitors.lock().unwrap().insert(funding_txo, (monitor.get_latest_update_id(), ser.0)) {
 170                         panic!("Already had monitor pre-watch_channel");
 171                 }
 172                 self.chain_monitor.watch_channel(funding_txo, monitor)
 173         }
 174
 175         fn update_channel(&self, funding_txo: OutPoint, update: &channelmonitor::ChannelMonitorUpdate) -> chain::ChannelMonitorUpdateStatus {
 176                 let mut map_lock = self.latest_monitors.lock().unwrap();
 177                 let map_entry = map_lock.get_mut(&funding_txo).expect("Didn't have monitor on update call");
 178                 let deserialized_monitor = <(BlockHash, channelmonitor::ChannelMonitor<TestChannelSigner>)>::
 179                         read(&mut Cursor::new(&map_entry.1), (&*self.keys, &*self.keys)).unwrap().1;
 180                 deserialized_monitor.update_monitor(update, &&TestBroadcaster{}, &&FuzzEstimator { ret_val: atomic::AtomicU32::new(253) }, &self.logger).unwrap();
 181                 let mut ser = VecWriter(Vec::new());
 182                 deserialized_monitor.write(&mut ser).unwrap();
 183                 *map_entry = (update.update_id, ser.0);
 184                 self.chain_monitor.update_channel(funding_txo, update)
 185         }
 186
 187         fn release_pending_monitor_events(&self) -> Vec<(OutPoint, ChannelId, Vec<MonitorEvent>, Option<PublicKey>)> {
 188                 return self.chain_monitor.release_pending_monitor_events();
 189         }
 190 }
 191
 192 struct KeyProvider {
 193         node_secret: SecretKey,
 194         rand_bytes_id: atomic::AtomicU32,
 195         enforcement_states: Mutex<HashMap<[u8;32], Arc<Mutex<EnforcementState>>>>,
 196 }
 197
 198 impl EntropySource for KeyProvider {
 199         fn get_secure_random_bytes(&self) -> [u8; 32] {
 200                 let id = self.rand_bytes_id.fetch_add(1, atomic::Ordering::Relaxed);
 201                 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]];
 202                 res[30-4..30].copy_from_slice(&id.to_le_bytes());
 203                 res
 204         }
 205 }
 206
 207 impl NodeSigner for KeyProvider {
 208         fn get_node_id(&self, recipient: Recipient) -> Result<PublicKey, ()> {
 209                 let node_secret = match recipient {
 210                         Recipient::Node => Ok(&self.node_secret),
 211                         Recipient::PhantomNode => Err(())
 212                 }?;
 213                 Ok(PublicKey::from_secret_key(&Secp256k1::signing_only(), node_secret))
 214         }
 215
 216         fn ecdh(&self, recipient: Recipient, other_key: &PublicKey, tweak: Option<&Scalar>) -> Result<SharedSecret, ()> {
 217                 let mut node_secret = match recipient {
 218                         Recipient::Node => Ok(self.node_secret.clone()),
 219                         Recipient::PhantomNode => Err(())
 220                 }?;
 221                 if let Some(tweak) = tweak {
 222                         node_secret = node_secret.mul_tweak(tweak).map_err(|_| ())?;
 223                 }
 224                 Ok(SharedSecret::new(other_key, &node_secret))
 225         }
 226
 227         fn get_inbound_payment_key_material(&self) -> KeyMaterial {
 228                 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]])
 229         }
 230
 231         fn sign_invoice(&self, _hrp_bytes: &[u8], _invoice_data: &[u5], _recipient: Recipient) -> Result<RecoverableSignature, ()> {
 232                 unreachable!()
 233         }
 234
 235         fn sign_bolt12_invoice_request(
 236                 &self, _invoice_request: &UnsignedInvoiceRequest
 237         ) -> Result<schnorr::Signature, ()> {
 238                 unreachable!()
 239         }
 240
 241         fn sign_bolt12_invoice(
 242                 &self, _invoice: &UnsignedBolt12Invoice,
 243         ) -> Result<schnorr::Signature, ()> {
 244                 unreachable!()
 245         }
 246
 247         fn sign_gossip_message(&self, msg: lightning::ln::msgs::UnsignedGossipMessage) -> Result<Signature, ()> {
 248                 let msg_hash = Message::from_slice(&Sha256dHash::hash(&msg.encode()[..])[..]).map_err(|_| ())?;
 249                 let secp_ctx = Secp256k1::signing_only();
 250                 Ok(secp_ctx.sign_ecdsa(&msg_hash, &self.node_secret))
 251         }
 252 }
 253
 254 impl SignerProvider for KeyProvider {
 255         type EcdsaSigner = TestChannelSigner;
 256         #[cfg(taproot)]
 257         type TaprootSigner = TestChannelSigner;
 258
 259         fn generate_channel_keys_id(&self, _inbound: bool, _channel_value_satoshis: u64, _user_channel_id: u128) -> [u8; 32] {
 260                 let id = self.rand_bytes_id.fetch_add(1, atomic::Ordering::Relaxed) as u8;
 261                 [id; 32]
 262         }
 263
 264         fn derive_channel_signer(&self, channel_value_satoshis: u64, channel_keys_id: [u8; 32]) -> Self::EcdsaSigner {
 265                 let secp_ctx = Secp256k1::signing_only();
 266                 let id = channel_keys_id[0];
 267                 let keys = InMemorySigner::new(
 268                         &secp_ctx,
 269                         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(),
 270                         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(),
 271                         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(),
 272                         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(),
 273                         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(),
 274                         [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]],
 275                         channel_value_satoshis,
 276                         channel_keys_id,
 277                         channel_keys_id,
 278                 );
 279                 let revoked_commitment = self.make_enforcement_state_cell(keys.commitment_seed);
 280                 TestChannelSigner::new_with_revoked(keys, revoked_commitment, false)
 281         }
 282
 283         fn read_chan_signer(&self, buffer: &[u8]) -> Result<Self::EcdsaSigner, DecodeError> {
 284                 let mut reader = std::io::Cursor::new(buffer);
 285
 286                 let inner: InMemorySigner = ReadableArgs::read(&mut reader, self)?;
 287                 let state = self.make_enforcement_state_cell(inner.commitment_seed);
 288
 289                 Ok(TestChannelSigner {
 290                         inner,
 291                         state,
 292                         disable_revocation_policy_check: false,
 293                         available: Arc::new(Mutex::new(true)),
 294                 })
 295         }
 296
 297         fn get_destination_script(&self, _channel_keys_id: [u8; 32]) -> Result<ScriptBuf, ()> {
 298                 let secp_ctx = Secp256k1::signing_only();
 299                 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();
 300                 let our_channel_monitor_claim_key_hash = WPubkeyHash::hash(&PublicKey::from_secret_key(&secp_ctx, &channel_monitor_claim_key).serialize());
 301                 Ok(Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0).push_slice(our_channel_monitor_claim_key_hash).into_script())
 302         }
 303
 304         fn get_shutdown_scriptpubkey(&self) -> Result<ShutdownScript, ()> {
 305                 let secp_ctx = Secp256k1::signing_only();
 306                 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();
 307                 let pubkey_hash = WPubkeyHash::hash(&PublicKey::from_secret_key(&secp_ctx, &secret_key).serialize());
 308                 Ok(ShutdownScript::new_p2wpkh(&pubkey_hash))
 309         }
 310 }
 311
 312 impl KeyProvider {
 313         fn make_enforcement_state_cell(&self, commitment_seed: [u8; 32]) -> Arc<Mutex<EnforcementState>> {
 314                 let mut revoked_commitments = self.enforcement_states.lock().unwrap();
 315                 if !revoked_commitments.contains_key(&commitment_seed) {
 316                         revoked_commitments.insert(commitment_seed, Arc::new(Mutex::new(EnforcementState::new())));
 317                 }
 318                 let cell = revoked_commitments.get(&commitment_seed).unwrap();
 319                 Arc::clone(cell)
 320         }
 321 }
 322
 323 #[inline]
 324 fn check_api_err(api_err: APIError, sendable_bounds_violated: bool) {
 325         match api_err {
 326                 APIError::APIMisuseError { .. } => panic!("We can't misuse the API"),
 327                 APIError::FeeRateTooHigh { .. } => panic!("We can't send too much fee?"),
 328                 APIError::InvalidRoute { .. } => panic!("Our routes should work"),
 329                 APIError::ChannelUnavailable { err } => {
 330                         // Test the error against a list of errors we can hit, and reject
 331                         // all others. If you hit this panic, the list of acceptable errors
 332                         // is probably just stale and you should add new messages here.
 333                         match err.as_str() {
 334                                 "Peer for first hop currently disconnected" => {},
 335                                 _ if err.starts_with("Cannot send less than our next-HTLC minimum - ") => {},
 336                                 _ if err.starts_with("Cannot send more than our next-HTLC maximum - ") => {},
 337                                 _ => panic!("{}", err),
 338                         }
 339                         assert!(sendable_bounds_violated);
 340                 },
 341                 APIError::MonitorUpdateInProgress => {
 342                         // We can (obviously) temp-fail a monitor update
 343                 },
 344                 APIError::IncompatibleShutdownScript { .. } => panic!("Cannot send an incompatible shutdown script"),
 345         }
 346 }
 347 #[inline]
 348 fn check_payment_err(send_err: PaymentSendFailure, sendable_bounds_violated: bool) {
 349         match send_err {
 350                 PaymentSendFailure::ParameterError(api_err) => check_api_err(api_err, sendable_bounds_violated),
 351                 PaymentSendFailure::PathParameterError(per_path_results) => {
 352                         for res in per_path_results { if let Err(api_err) = res { check_api_err(api_err, sendable_bounds_violated); } }
 353                 },
 354                 PaymentSendFailure::AllFailedResendSafe(per_path_results) => {
 355                         for api_err in per_path_results { check_api_err(api_err, sendable_bounds_violated); }
 356                 },
 357                 PaymentSendFailure::PartialFailure { results, .. } => {
 358                         for res in results { if let Err(api_err) = res { check_api_err(api_err, sendable_bounds_violated); } }
 359                 },
 360                 PaymentSendFailure::DuplicatePayment => panic!(),
 361         }
 362 }
 363
 364 type ChanMan<'a> = ChannelManager<Arc<TestChainMonitor>, Arc<TestBroadcaster>, Arc<KeyProvider>, Arc<KeyProvider>, Arc<KeyProvider>, Arc<FuzzEstimator>, &'a FuzzRouter, Arc<dyn Logger>>;
 365
 366 #[inline]
 367 fn get_payment_secret_hash(dest: &ChanMan, payment_id: &mut u8) -> Option<(PaymentSecret, PaymentHash)> {
 368         let mut payment_hash;
 369         for _ in 0..256 {
 370                 payment_hash = PaymentHash(Sha256::hash(&[*payment_id; 1]).to_byte_array());
 371                 if let Ok(payment_secret) = dest.create_inbound_payment_for_hash(payment_hash, None, 3600, None) {
 372                         return Some((payment_secret, payment_hash));
 373                 }
 374                 *payment_id = payment_id.wrapping_add(1);
 375         }
 376         None
 377 }
 378
 379 #[inline]
 380 fn send_payment(source: &ChanMan, dest: &ChanMan, dest_chan_id: u64, amt: u64, payment_id: &mut u8, payment_idx: &mut u64) -> bool {
 381         let (payment_secret, payment_hash) =
 382                 if let Some((secret, hash)) = get_payment_secret_hash(dest, payment_id) { (secret, hash) } else { return true; };
 383         let mut payment_id = [0; 32];
 384         payment_id[0..8].copy_from_slice(&payment_idx.to_ne_bytes());
 385         *payment_idx += 1;
 386         let (min_value_sendable, max_value_sendable) = source.list_usable_channels()
 387                 .iter().find(|chan| chan.short_channel_id == Some(dest_chan_id))
 388                 .map(|chan|
 389                         (chan.next_outbound_htlc_minimum_msat, chan.next_outbound_htlc_limit_msat))
 390                 .unwrap_or((0, 0));
 391         if let Err(err) = source.send_payment_with_route(&Route {
 392                 paths: vec![Path { hops: vec![RouteHop {
 393                         pubkey: dest.get_our_node_id(),
 394                         node_features: dest.node_features(),
 395                         short_channel_id: dest_chan_id,
 396                         channel_features: dest.channel_features(),
 397                         fee_msat: amt,
 398                         cltv_expiry_delta: 200,
 399                         maybe_announced_channel: true,
 400                 }], blinded_tail: None }],
 401                 route_params: None,
 402         }, payment_hash, RecipientOnionFields::secret_only(payment_secret), PaymentId(payment_id)) {
 403                 check_payment_err(err, amt > max_value_sendable || amt < min_value_sendable);
 404                 false
 405         } else {
 406                 // Note that while the max is a strict upper-bound, we can occasionally send substantially
 407                 // below the minimum, with some gap which is unusable immediately below the minimum. Thus,
 408                 // we don't check against min_value_sendable here.
 409                 assert!(amt <= max_value_sendable);
 410                 true
 411         }
 412 }
 413 #[inline]
 414 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 {
 415         let (payment_secret, payment_hash) =
 416                 if let Some((secret, hash)) = get_payment_secret_hash(dest, payment_id) { (secret, hash) } else { return true; };
 417         let mut payment_id = [0; 32];
 418         payment_id[0..8].copy_from_slice(&payment_idx.to_ne_bytes());
 419         *payment_idx += 1;
 420         let (min_value_sendable, max_value_sendable) = source.list_usable_channels()
 421                 .iter().find(|chan| chan.short_channel_id == Some(middle_chan_id))
 422                 .map(|chan|
 423                         (chan.next_outbound_htlc_minimum_msat, chan.next_outbound_htlc_limit_msat))
 424                 .unwrap_or((0, 0));
 425         let first_hop_fee = 50_000;
 426         if let Err(err) = source.send_payment_with_route(&Route {
 427                 paths: vec![Path { hops: vec![RouteHop {
 428                         pubkey: middle.get_our_node_id(),
 429                         node_features: middle.node_features(),
 430                         short_channel_id: middle_chan_id,
 431                         channel_features: middle.channel_features(),
 432                         fee_msat: first_hop_fee,
 433                         cltv_expiry_delta: 100,
 434                         maybe_announced_channel: true,
 435                 }, RouteHop {
 436                         pubkey: dest.get_our_node_id(),
 437                         node_features: dest.node_features(),
 438                         short_channel_id: dest_chan_id,
 439                         channel_features: dest.channel_features(),
 440                         fee_msat: amt,
 441                         cltv_expiry_delta: 200,
 442                         maybe_announced_channel: true,
 443                 }], blinded_tail: None }],
 444                 route_params: None,
 445         }, payment_hash, RecipientOnionFields::secret_only(payment_secret), PaymentId(payment_id)) {
 446                 let sent_amt = amt + first_hop_fee;
 447                 check_payment_err(err, sent_amt < min_value_sendable || sent_amt > max_value_sendable);
 448                 false
 449         } else {
 450                 // Note that while the max is a strict upper-bound, we can occasionally send substantially
 451                 // below the minimum, with some gap which is unusable immediately below the minimum. Thus,
 452                 // we don't check against min_value_sendable here.
 453                 assert!(amt + first_hop_fee <= max_value_sendable);
 454                 true
 455         }
 456 }
 457
 458 #[inline]
 459 pub fn do_test<Out: Output>(data: &[u8], underlying_out: Out, anchors: bool) {
 460         let out = SearchingOutput::new(underlying_out);
 461         let broadcast = Arc::new(TestBroadcaster{});
 462         let router = FuzzRouter {};
 463
 464         macro_rules! make_node {
 465                 ($node_id: expr, $fee_estimator: expr) => { {
 466                         let logger: Arc<dyn Logger> = Arc::new(test_logger::TestLogger::new($node_id.to_string(), out.clone()));
 467                         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();
 468                         let keys_manager = Arc::new(KeyProvider { node_secret, rand_bytes_id: atomic::AtomicU32::new(0), enforcement_states: Mutex::new(new_hash_map()) });
 469                         let monitor = Arc::new(TestChainMonitor::new(broadcast.clone(), logger.clone(), $fee_estimator.clone(),
 470                                 Arc::new(TestPersister {
 471                                         update_ret: Mutex::new(ChannelMonitorUpdateStatus::Completed)
 472                                 }), Arc::clone(&keys_manager)));
 473
 474                         let mut config = UserConfig::default();
 475                         config.channel_config.forwarding_fee_proportional_millionths = 0;
 476                         config.channel_handshake_config.announced_channel = true;
 477                         if anchors {
 478                                 config.channel_handshake_config.negotiate_anchors_zero_fee_htlc_tx = true;
 479                                 config.manually_accept_inbound_channels = true;
 480                         }
 481                         let network = Network::Bitcoin;
 482                         let best_block_timestamp = genesis_block(network).header.time;
 483                         let params = ChainParameters {
 484                                 network,
 485                                 best_block: BestBlock::from_network(network),
 486                         };
 487                         (ChannelManager::new($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),
 488                         monitor, keys_manager)
 489                 } }
 490         }
 491
 492         macro_rules! reload_node {
 493                 ($ser: expr, $node_id: expr, $old_monitors: expr, $keys_manager: expr, $fee_estimator: expr) => { {
 494                     let keys_manager = Arc::clone(& $keys_manager);
 495                         let logger: Arc<dyn Logger> = Arc::new(test_logger::TestLogger::new($node_id.to_string(), out.clone()));
 496                         let chain_monitor = Arc::new(TestChainMonitor::new(broadcast.clone(), logger.clone(), $fee_estimator.clone(),
 497                                 Arc::new(TestPersister {
 498                                         update_ret: Mutex::new(ChannelMonitorUpdateStatus::Completed)
 499                                 }), Arc::clone(& $keys_manager)));
 500
 501                         let mut config = UserConfig::default();
 502                         config.channel_config.forwarding_fee_proportional_millionths = 0;
 503                         config.channel_handshake_config.announced_channel = true;
 504                         if anchors {
 505                                 config.channel_handshake_config.negotiate_anchors_zero_fee_htlc_tx = true;
 506                                 config.manually_accept_inbound_channels = true;
 507                         }
 508
 509                         let mut monitors = new_hash_map();
 510                         let mut old_monitors = $old_monitors.latest_monitors.lock().unwrap();
 511                         for (outpoint, (update_id, monitor_ser)) in old_monitors.drain() {
 512                                 monitors.insert(outpoint, <(BlockHash, ChannelMonitor<TestChannelSigner>)>::read(&mut Cursor::new(&monitor_ser), (&*$keys_manager, &*$keys_manager)).expect("Failed to read monitor").1);
 513                                 chain_monitor.latest_monitors.lock().unwrap().insert(outpoint, (update_id, monitor_ser));
 514                         }
 515                         let mut monitor_refs = new_hash_map();
 516                         for (outpoint, monitor) in monitors.iter_mut() {
 517                                 monitor_refs.insert(*outpoint, monitor);
 518                         }
 519
 520                         let read_args = ChannelManagerReadArgs {
 521                                 entropy_source: keys_manager.clone(),
 522                                 node_signer: keys_manager.clone(),
 523                                 signer_provider: keys_manager.clone(),
 524                                 fee_estimator: $fee_estimator.clone(),
 525                                 chain_monitor: chain_monitor.clone(),
 526                                 tx_broadcaster: broadcast.clone(),
 527                                 router: &router,
 528                                 logger,
 529                                 default_config: config,
 530                                 channel_monitors: monitor_refs,
 531                         };
 532
 533                         let res = (<(BlockHash, ChanMan)>::read(&mut Cursor::new(&$ser.0), read_args).expect("Failed to read manager").1, chain_monitor.clone());
 534                         for (funding_txo, mon) in monitors.drain() {
 535                                 assert_eq!(chain_monitor.chain_monitor.watch_channel(funding_txo, mon),
 536                                         Ok(ChannelMonitorUpdateStatus::Completed));
 537                         }
 538                         res
 539                 } }
 540         }
 541
 542         let mut channel_txn = Vec::new();
 543         macro_rules! make_channel {
 544                 ($source: expr, $dest: expr, $dest_keys_manager: expr, $chan_id: expr) => { {
 545                         $source.peer_connected(&$dest.get_our_node_id(), &Init {
 546                                 features: $dest.init_features(), networks: None, remote_network_address: None
 547                         }, true).unwrap();
 548                         $dest.peer_connected(&$source.get_our_node_id(), &Init {
 549                                 features: $source.init_features(), networks: None, remote_network_address: None
 550                         }, false).unwrap();
 551
 552                         $source.create_channel($dest.get_our_node_id(), 100_000, 42, 0, None, None).unwrap();
 553                         let open_channel = {
 554                                 let events = $source.get_and_clear_pending_msg_events();
 555                                 assert_eq!(events.len(), 1);
 556                                 if let events::MessageSendEvent::SendOpenChannel { ref msg, .. } = events[0] {
 557                                         msg.clone()
 558                                 } else { panic!("Wrong event type"); }
 559                         };
 560
 561                         $dest.handle_open_channel(&$source.get_our_node_id(), &open_channel);
 562                         let accept_channel = {
 563                                 if anchors {
 564                                         let events = $dest.get_and_clear_pending_events();
 565                                         assert_eq!(events.len(), 1);
 566                                         if let events::Event::OpenChannelRequest {
 567                                                 ref temporary_channel_id, ref counterparty_node_id, ..
 568                                         } = events[0] {
 569                                                 let mut random_bytes = [0u8; 16];
 570                                                 random_bytes.copy_from_slice(&$dest_keys_manager.get_secure_random_bytes()[..16]);
 571                                                 let user_channel_id = u128::from_be_bytes(random_bytes);
 572                                                 $dest.accept_inbound_channel(
 573                                                         temporary_channel_id,
 574                                                         counterparty_node_id,
 575                                                         user_channel_id,
 576                                                 ).unwrap();
 577                                         } else { panic!("Wrong event type"); }
 578                                 }
 579                                 let events = $dest.get_and_clear_pending_msg_events();
 580                                 assert_eq!(events.len(), 1);
 581                                 if let events::MessageSendEvent::SendAcceptChannel { ref msg, .. } = events[0] {
 582                                         msg.clone()
 583                                 } else { panic!("Wrong event type"); }
 584                         };
 585
 586                         $source.handle_accept_channel(&$dest.get_our_node_id(), &accept_channel);
 587                         let funding_output;
 588                         {
 589                                 let events = $source.get_and_clear_pending_events();
 590                                 assert_eq!(events.len(), 1);
 591                                 if let events::Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, .. } = events[0] {
 592                                         let tx = Transaction { version: $chan_id, lock_time: LockTime::ZERO, input: Vec::new(), output: vec![TxOut {
 593                                                 value: *channel_value_satoshis, script_pubkey: output_script.clone(),
 594                                         }]};
 595                                         funding_output = OutPoint { txid: tx.txid(), index: 0 };
 596                                         $source.funding_transaction_generated(&temporary_channel_id, &$dest.get_our_node_id(), tx.clone()).unwrap();
 597                                         channel_txn.push(tx);
 598                                 } else { panic!("Wrong event type"); }
 599                         }
 600
 601                         let funding_created = {
 602                                 let events = $source.get_and_clear_pending_msg_events();
 603                                 assert_eq!(events.len(), 1);
 604                                 if let events::MessageSendEvent::SendFundingCreated { ref msg, .. } = events[0] {
 605                                         msg.clone()
 606                                 } else { panic!("Wrong event type"); }
 607                         };
 608                         $dest.handle_funding_created(&$source.get_our_node_id(), &funding_created);
 609
 610                         let funding_signed = {
 611                                 let events = $dest.get_and_clear_pending_msg_events();
 612                                 assert_eq!(events.len(), 1);
 613                                 if let events::MessageSendEvent::SendFundingSigned { ref msg, .. } = events[0] {
 614                                         msg.clone()
 615                                 } else { panic!("Wrong event type"); }
 616                         };
 617                         let events = $dest.get_and_clear_pending_events();
 618                         assert_eq!(events.len(), 1);
 619                         if let events::Event::ChannelPending{ ref counterparty_node_id, .. } = events[0] {
 620                                 assert_eq!(counterparty_node_id, &$source.get_our_node_id());
 621                         } else { panic!("Wrong event type"); }
 622
 623                         $source.handle_funding_signed(&$dest.get_our_node_id(), &funding_signed);
 624                         let events = $source.get_and_clear_pending_events();
 625                         assert_eq!(events.len(), 1);
 626                         if let events::Event::ChannelPending{ ref counterparty_node_id, .. } = events[0] {
 627                                 assert_eq!(counterparty_node_id, &$dest.get_our_node_id());
 628                         } else { panic!("Wrong event type"); }
 629
 630                         funding_output
 631                 } }
 632         }
 633
 634         macro_rules! confirm_txn {
 635                 ($node: expr) => { {
 636                         let chain_hash = genesis_block(Network::Bitcoin).block_hash();
 637                         let mut header = create_dummy_header(chain_hash, 42);
 638                         let txdata: Vec<_> = channel_txn.iter().enumerate().map(|(i, tx)| (i + 1, tx)).collect();
 639                         $node.transactions_confirmed(&header, &txdata, 1);
 640                         for _ in 2..100 {
 641                                 header = create_dummy_header(header.block_hash(), 42);
 642                         }
 643                         $node.best_block_updated(&header, 99);
 644                 } }
 645         }
 646
 647         macro_rules! lock_fundings {
 648                 ($nodes: expr) => { {
 649                         let mut node_events = Vec::new();
 650                         for node in $nodes.iter() {
 651                                 node_events.push(node.get_and_clear_pending_msg_events());
 652                         }
 653                         for (idx, node_event) in node_events.iter().enumerate() {
 654                                 for event in node_event {
 655                                         if let events::MessageSendEvent::SendChannelReady { ref node_id, ref msg } = event {
 656                                                 for node in $nodes.iter() {
 657                                                         if node.get_our_node_id() == *node_id {
 658                                                                 node.handle_channel_ready(&$nodes[idx].get_our_node_id(), msg);
 659                                                         }
 660                                                 }
 661                                         } else { panic!("Wrong event type"); }
 662                                 }
 663                         }
 664
 665                         for node in $nodes.iter() {
 666                                 let events = node.get_and_clear_pending_msg_events();
 667                                 for event in events {
 668                                         if let events::MessageSendEvent::SendAnnouncementSignatures { .. } = event {
 669                                         } else { panic!("Wrong event type"); }
 670                                 }
 671                         }
 672                 } }
 673         }
 674
 675         let fee_est_a = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 676         let mut last_htlc_clear_fee_a =  253;
 677         let fee_est_b = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 678         let mut last_htlc_clear_fee_b =  253;
 679         let fee_est_c = Arc::new(FuzzEstimator { ret_val: atomic::AtomicU32::new(253) });
 680         let mut last_htlc_clear_fee_c =  253;
 681
 682         // 3 nodes is enough to hit all the possible cases, notably unknown-source-unknown-dest
 683         // forwarding.
 684         let (node_a, mut monitor_a, keys_manager_a) = make_node!(0, fee_est_a);
 685         let (node_b, mut monitor_b, keys_manager_b) = make_node!(1, fee_est_b);
 686         let (node_c, mut monitor_c, keys_manager_c) = make_node!(2, fee_est_c);
 687
 688         let mut nodes = [node_a, node_b, node_c];
 689
 690         let chan_1_funding = make_channel!(nodes[0], nodes[1], keys_manager_b, 0);
 691         let chan_2_funding = make_channel!(nodes[1], nodes[2], keys_manager_c, 1);
 692
 693         for node in nodes.iter() {
 694                 confirm_txn!(node);
 695         }
 696
 697         lock_fundings!(nodes);
 698
 699         let chan_a = nodes[0].list_usable_channels()[0].short_channel_id.unwrap();
 700         let chan_b = nodes[2].list_usable_channels()[0].short_channel_id.unwrap();
 701
 702         let mut payment_id: u8 = 0;
 703         let mut payment_idx: u64 = 0;
 704
 705         let mut chan_a_disconnected = false;
 706         let mut chan_b_disconnected = false;
 707         let mut ab_events = Vec::new();
 708         let mut ba_events = Vec::new();
 709         let mut bc_events = Vec::new();
 710         let mut cb_events = Vec::new();
 711
 712         let mut node_a_ser = VecWriter(Vec::new());
 713         nodes[0].write(&mut node_a_ser).unwrap();
 714         let mut node_b_ser = VecWriter(Vec::new());
 715         nodes[1].write(&mut node_b_ser).unwrap();
 716         let mut node_c_ser = VecWriter(Vec::new());
 717         nodes[2].write(&mut node_c_ser).unwrap();
 718
 719         macro_rules! test_return {
 720                 () => { {
 721                         assert_eq!(nodes[0].list_channels().len(), 1);
 722                         assert_eq!(nodes[1].list_channels().len(), 2);
 723                         assert_eq!(nodes[2].list_channels().len(), 1);
 724                         return;
 725                 } }
 726         }
 727
 728         let mut read_pos = 0;
 729         macro_rules! get_slice {
 730                 ($len: expr) => {
 731                         {
 732                                 let slice_len = $len as usize;
 733                                 if data.len() < read_pos + slice_len {
 734                                         test_return!();
 735                                 }
 736                                 read_pos += slice_len;
 737                                 &data[read_pos - slice_len..read_pos]
 738                         }
 739                 }
 740         }
 741
 742         loop {
 743                 // Push any events from Node B onto ba_events and bc_events
 744                 macro_rules! push_excess_b_events {
 745                         ($excess_events: expr, $expect_drop_node: expr) => { {
 746                                 let a_id = nodes[0].get_our_node_id();
 747                                 let expect_drop_node: Option<usize> = $expect_drop_node;
 748                                 let expect_drop_id = if let Some(id) = expect_drop_node { Some(nodes[id].get_our_node_id()) } else { None };
 749                                 for event in $excess_events {
 750                                         let push_a = match event {
 751                                                 events::MessageSendEvent::UpdateHTLCs { ref node_id, .. } => {
 752                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 753                                                         *node_id == a_id
 754                                                 },
 755                                                 events::MessageSendEvent::SendRevokeAndACK { ref node_id, .. } => {
 756                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 757                                                         *node_id == a_id
 758                                                 },
 759                                                 events::MessageSendEvent::SendChannelReestablish { ref node_id, .. } => {
 760                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 761                                                         *node_id == a_id
 762                                                 },
 763                                                 events::MessageSendEvent::SendChannelReady { .. } => continue,
 764                                                 events::MessageSendEvent::SendAnnouncementSignatures { .. } => continue,
 765                                                 events::MessageSendEvent::SendChannelUpdate { ref node_id, ref msg } => {
 766                                                         assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 767                                                         if Some(*node_id) == expect_drop_id { panic!("peer_disconnected should drop msgs bound for the disconnected peer"); }
 768                                                         *node_id == a_id
 769                                                 },
 770                                                 _ => panic!("Unhandled message event {:?}", event),
 771                                         };
 772                                         if push_a { ba_events.push(event); } else { bc_events.push(event); }
 773                                 }
 774                         } }
 775                 }
 776
 777                 // While delivering messages, we select across three possible message selection processes
 778                 // to ensure we get as much coverage as possible. See the individual enum variants for more
 779                 // details.
 780                 #[derive(PartialEq)]
 781                 enum ProcessMessages {
 782                         /// Deliver all available messages, including fetching any new messages from
 783                         /// `get_and_clear_pending_msg_events()` (which may have side effects).
 784                         AllMessages,
 785                         /// Call `get_and_clear_pending_msg_events()` first, and then deliver up to one
 786                         /// message (which may already be queued).
 787                         OneMessage,
 788                         /// Deliver up to one already-queued message. This avoids any potential side-effects
 789                         /// of `get_and_clear_pending_msg_events()` (eg freeing the HTLC holding cell), which
 790                         /// provides potentially more coverage.
 791                         OnePendingMessage,
 792                 }
 793
 794                 macro_rules! process_msg_events {
 795                         ($node: expr, $corrupt_forward: expr, $limit_events: expr) => { {
 796                                 let mut events = if $node == 1 {
 797                                         let mut new_events = Vec::new();
 798                                         mem::swap(&mut new_events, &mut ba_events);
 799                                         new_events.extend_from_slice(&bc_events[..]);
 800                                         bc_events.clear();
 801                                         new_events
 802                                 } else if $node == 0 {
 803                                         let mut new_events = Vec::new();
 804                                         mem::swap(&mut new_events, &mut ab_events);
 805                                         new_events
 806                                 } else {
 807                                         let mut new_events = Vec::new();
 808                                         mem::swap(&mut new_events, &mut cb_events);
 809                                         new_events
 810                                 };
 811                                 let mut new_events = Vec::new();
 812                                 if $limit_events != ProcessMessages::OnePendingMessage {
 813                                         new_events = nodes[$node].get_and_clear_pending_msg_events();
 814                                 }
 815                                 let mut had_events = false;
 816                                 let mut events_iter = events.drain(..).chain(new_events.drain(..));
 817                                 let mut extra_ev = None;
 818                                 for event in &mut events_iter {
 819                                         had_events = true;
 820                                         match event {
 821                                                 events::MessageSendEvent::UpdateHTLCs { node_id, updates: CommitmentUpdate { update_add_htlcs, update_fail_htlcs, update_fulfill_htlcs, update_fail_malformed_htlcs, update_fee, commitment_signed } } => {
 822                                                         for (idx, dest) in nodes.iter().enumerate() {
 823                                                                 if dest.get_our_node_id() == node_id {
 824                                                                         for update_add in update_add_htlcs.iter() {
 825                                                                                 out.locked_write(format!("Delivering update_add_htlc to node {}.\n", idx).as_bytes());
 826                                                                                 if !$corrupt_forward {
 827                                                                                         dest.handle_update_add_htlc(&nodes[$node].get_our_node_id(), update_add);
 828                                                                                 } else {
 829                                                                                         // Corrupt the update_add_htlc message so that its HMAC
 830                                                                                         // check will fail and we generate a
 831                                                                                         // update_fail_malformed_htlc instead of an
 832                                                                                         // update_fail_htlc as we do when we reject a payment.
 833                                                                                         let mut msg_ser = update_add.encode();
 834                                                                                         msg_ser[1000] ^= 0xff;
 835                                                                                         let new_msg = UpdateAddHTLC::read(&mut Cursor::new(&msg_ser)).unwrap();
 836                                                                                         dest.handle_update_add_htlc(&nodes[$node].get_our_node_id(), &new_msg);
 837                                                                                 }
 838                                                                         }
 839                                                                         for update_fulfill in update_fulfill_htlcs.iter() {
 840                                                                                 out.locked_write(format!("Delivering update_fulfill_htlc to node {}.\n", idx).as_bytes());
 841                                                                                 dest.handle_update_fulfill_htlc(&nodes[$node].get_our_node_id(), update_fulfill);
 842                                                                         }
 843                                                                         for update_fail in update_fail_htlcs.iter() {
 844                                                                                 out.locked_write(format!("Delivering update_fail_htlc to node {}.\n", idx).as_bytes());
 845                                                                                 dest.handle_update_fail_htlc(&nodes[$node].get_our_node_id(), update_fail);
 846                                                                         }
 847                                                                         for update_fail_malformed in update_fail_malformed_htlcs.iter() {
 848                                                                                 out.locked_write(format!("Delivering update_fail_malformed_htlc to node {}.\n", idx).as_bytes());
 849                                                                                 dest.handle_update_fail_malformed_htlc(&nodes[$node].get_our_node_id(), update_fail_malformed);
 850                                                                         }
 851                                                                         if let Some(msg) = update_fee {
 852                                                                                 out.locked_write(format!("Delivering update_fee to node {}.\n", idx).as_bytes());
 853                                                                                 dest.handle_update_fee(&nodes[$node].get_our_node_id(), &msg);
 854                                                                         }
 855                                                                         let processed_change = !update_add_htlcs.is_empty() || !update_fulfill_htlcs.is_empty() ||
 856                                                                                 !update_fail_htlcs.is_empty() || !update_fail_malformed_htlcs.is_empty();
 857                                                                         if $limit_events != ProcessMessages::AllMessages && processed_change {
 858                                                                                 // If we only want to process some messages, don't deliver the CS until later.
 859                                                                                 extra_ev = Some(events::MessageSendEvent::UpdateHTLCs { node_id, updates: CommitmentUpdate {
 860                                                                                         update_add_htlcs: Vec::new(),
 861                                                                                         update_fail_htlcs: Vec::new(),
 862                                                                                         update_fulfill_htlcs: Vec::new(),
 863                                                                                         update_fail_malformed_htlcs: Vec::new(),
 864                                                                                         update_fee: None,
 865                                                                                         commitment_signed
 866                                                                                 } });
 867                                                                                 break;
 868                                                                         }
 869                                                                         out.locked_write(format!("Delivering commitment_signed to node {}.\n", idx).as_bytes());
 870                                                                         dest.handle_commitment_signed(&nodes[$node].get_our_node_id(), &commitment_signed);
 871                                                                         break;
 872                                                                 }
 873                                                         }
 874                                                 },
 875                                                 events::MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
 876                                                         for (idx, dest) in nodes.iter().enumerate() {
 877                                                                 if dest.get_our_node_id() == *node_id {
 878                                                                         out.locked_write(format!("Delivering revoke_and_ack to node {}.\n", idx).as_bytes());
 879                                                                         dest.handle_revoke_and_ack(&nodes[$node].get_our_node_id(), msg);
 880                                                                 }
 881                                                         }
 882                                                 },
 883                                                 events::MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
 884                                                         for (idx, dest) in nodes.iter().enumerate() {
 885                                                                 if dest.get_our_node_id() == *node_id {
 886                                                                         out.locked_write(format!("Delivering channel_reestablish to node {}.\n", idx).as_bytes());
 887                                                                         dest.handle_channel_reestablish(&nodes[$node].get_our_node_id(), msg);
 888                                                                 }
 889                                                         }
 890                                                 },
 891                                                 events::MessageSendEvent::SendChannelReady { .. } => {
 892                                                         // Can be generated as a reestablish response
 893                                                 },
 894                                                 events::MessageSendEvent::SendAnnouncementSignatures { .. } => {
 895                                                         // Can be generated as a reestablish response
 896                                                 },
 897                                                 events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 898                                                         // When we reconnect we will resend a channel_update to make sure our
 899                                                         // counterparty has the latest parameters for receiving payments
 900                                                         // through us. We do, however, check that the message does not include
 901                                                         // the "disabled" bit, as we should never ever have a channel which is
 902                                                         // disabled when we send such an update (or it may indicate channel
 903                                                         // force-close which we should detect as an error).
 904                                                         assert_eq!(msg.contents.flags & 2, 0);
 905                                                 },
 906                                                 _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 907                                                         return;
 908                                                 } else {
 909                                                         panic!("Unhandled message event {:?}", event)
 910                                                 },
 911                                         }
 912                                         if $limit_events != ProcessMessages::AllMessages {
 913                                                 break;
 914                                         }
 915                                 }
 916                                 if $node == 1 {
 917                                         push_excess_b_events!(extra_ev.into_iter().chain(events_iter), None);
 918                                 } else if $node == 0 {
 919                                         if let Some(ev) = extra_ev { ab_events.push(ev); }
 920                                         for event in events_iter { ab_events.push(event); }
 921                                 } else {
 922                                         if let Some(ev) = extra_ev { cb_events.push(ev); }
 923                                         for event in events_iter { cb_events.push(event); }
 924                                 }
 925                                 had_events
 926                         } }
 927                 }
 928
 929                 macro_rules! drain_msg_events_on_disconnect {
 930                         ($counterparty_id: expr) => { {
 931                                 if $counterparty_id == 0 {
 932                                         for event in nodes[0].get_and_clear_pending_msg_events() {
 933                                                 match event {
 934                                                         events::MessageSendEvent::UpdateHTLCs { .. } => {},
 935                                                         events::MessageSendEvent::SendRevokeAndACK { .. } => {},
 936                                                         events::MessageSendEvent::SendChannelReestablish { .. } => {},
 937                                                         events::MessageSendEvent::SendChannelReady { .. } => {},
 938                                                         events::MessageSendEvent::SendAnnouncementSignatures { .. } => {},
 939                                                         events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 940                                                                 assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 941                                                         },
 942                                                         _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 943                                                                 return;
 944                                                         } else {
 945                                                                 panic!("Unhandled message event")
 946                                                         },
 947                                                 }
 948                                         }
 949                                         push_excess_b_events!(nodes[1].get_and_clear_pending_msg_events().drain(..), Some(0));
 950                                         ab_events.clear();
 951                                         ba_events.clear();
 952                                 } else {
 953                                         for event in nodes[2].get_and_clear_pending_msg_events() {
 954                                                 match event {
 955                                                         events::MessageSendEvent::UpdateHTLCs { .. } => {},
 956                                                         events::MessageSendEvent::SendRevokeAndACK { .. } => {},
 957                                                         events::MessageSendEvent::SendChannelReestablish { .. } => {},
 958                                                         events::MessageSendEvent::SendChannelReady { .. } => {},
 959                                                         events::MessageSendEvent::SendAnnouncementSignatures { .. } => {},
 960                                                         events::MessageSendEvent::SendChannelUpdate { ref msg, .. } => {
 961                                                                 assert_eq!(msg.contents.flags & 2, 0); // The disable bit must never be set!
 962                                                         },
 963                                                         _ => if out.may_fail.load(atomic::Ordering::Acquire) {
 964                                                                 return;
 965                                                         } else {
 966                                                                 panic!("Unhandled message event")
 967                                                         },
 968                                                 }
 969                                         }
 970                                         push_excess_b_events!(nodes[1].get_and_clear_pending_msg_events().drain(..), Some(2));
 971                                         bc_events.clear();
 972                                         cb_events.clear();
 973                                 }
 974                         } }
 975                 }
 976
 977                 macro_rules! process_events {
 978                         ($node: expr, $fail: expr) => { {
 979                                 // In case we get 256 payments we may have a hash collision, resulting in the
 980                                 // second claim/fail call not finding the duplicate-hash HTLC, so we have to
 981                                 // deduplicate the calls here.
 982                                 let mut claim_set = new_hash_map();
 983                                 let mut events = nodes[$node].get_and_clear_pending_events();
 984                                 // Sort events so that PendingHTLCsForwardable get processed last. This avoids a
 985                                 // case where we first process a PendingHTLCsForwardable, then claim/fail on a
 986                                 // PaymentClaimable, claiming/failing two HTLCs, but leaving a just-generated
 987                                 // PaymentClaimable event for the second HTLC in our pending_events (and breaking
 988                                 // our claim_set deduplication).
 989                                 events.sort_by(|a, b| {
 990                                         if let events::Event::PaymentClaimable { .. } = a {
 991                                                 if let events::Event::PendingHTLCsForwardable { .. } = b {
 992                                                         Ordering::Less
 993                                                 } else { Ordering::Equal }
 994                                         } else if let events::Event::PendingHTLCsForwardable { .. } = a {
 995                                                 if let events::Event::PaymentClaimable { .. } = b {
 996                                                         Ordering::Greater
 997                                                 } else { Ordering::Equal }
 998                                         } else { Ordering::Equal }
 999                                 });
1000                                 let had_events = !events.is_empty();
1001                                 for event in events.drain(..) {
1002                                         match event {
1003                                                 events::Event::PaymentClaimable { payment_hash, .. } => {
1004                                                         if claim_set.insert(payment_hash.0, ()).is_none() {
1005                                                                 if $fail {
1006                                                                         nodes[$node].fail_htlc_backwards(&payment_hash);
1007                                                                 } else {
1008                                                                         nodes[$node].claim_funds(PaymentPreimage(payment_hash.0));
1009                                                                 }
1010                                                         }
1011                                                 },
1012                                                 events::Event::PaymentSent { .. } => {},
1013                                                 events::Event::PaymentClaimed { .. } => {},
1014                                                 events::Event::PaymentPathSuccessful { .. } => {},
1015                                                 events::Event::PaymentPathFailed { .. } => {},
1016                                                 events::Event::PaymentFailed { .. } => {},
1017                                                 events::Event::ProbeSuccessful { .. } | events::Event::ProbeFailed { .. } => {
1018                                                         // Even though we don't explicitly send probes, because probes are
1019                                                         // detected based on hashing the payment hash+preimage, its rather
1020                                                         // trivial for the fuzzer to build payments that accidentally end up
1021                                                         // looking like probes.
1022                                                 },
1023                                                 events::Event::PaymentForwarded { .. } if $node == 1 => {},
1024                                                 events::Event::ChannelReady { .. } => {},
1025                                                 events::Event::PendingHTLCsForwardable { .. } => {
1026                                                         nodes[$node].process_pending_htlc_forwards();
1027                                                 },
1028                                                 events::Event::HTLCHandlingFailed { .. } => {},
1029                                                 _ => if out.may_fail.load(atomic::Ordering::Acquire) {
1030                                                         return;
1031                                                 } else {
1032                                                         panic!("Unhandled event")
1033                                                 },
1034                                         }
1035                                 }
1036                                 had_events
1037                         } }
1038                 }
1039
1040                 let v = get_slice!(1)[0];
1041                 out.locked_write(format!("READ A BYTE! HANDLING INPUT {:x}...........\n", v).as_bytes());
1042                 match v {
1043                         // In general, we keep related message groups close together in binary form, allowing
1044                         // bit-twiddling mutations to have similar effects. This is probably overkill, but no
1045                         // harm in doing so.
1046
1047                         0x00 => *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
1048                         0x01 => *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
1049                         0x02 => *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::InProgress,
1050                         0x04 => *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
1051                         0x05 => *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
1052                         0x06 => *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed,
1053
1054                         0x08 => {
1055                                 if let Some((id, _)) = monitor_a.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1056                                         monitor_a.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
1057                                         nodes[0].process_monitor_events();
1058                                 }
1059                         },
1060                         0x09 => {
1061                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1062                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
1063                                         nodes[1].process_monitor_events();
1064                                 }
1065                         },
1066                         0x0a => {
1067                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1068                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1069                                         nodes[1].process_monitor_events();
1070                                 }
1071                         },
1072                         0x0b => {
1073                                 if let Some((id, _)) = monitor_c.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1074                                         monitor_c.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1075                                         nodes[2].process_monitor_events();
1076                                 }
1077                         },
1078
1079                         0x0c => {
1080                                 if !chan_a_disconnected {
1081                                         nodes[0].peer_disconnected(&nodes[1].get_our_node_id());
1082                                         nodes[1].peer_disconnected(&nodes[0].get_our_node_id());
1083                                         chan_a_disconnected = true;
1084                                         drain_msg_events_on_disconnect!(0);
1085                                 }
1086                         },
1087                         0x0d => {
1088                                 if !chan_b_disconnected {
1089                                         nodes[1].peer_disconnected(&nodes[2].get_our_node_id());
1090                                         nodes[2].peer_disconnected(&nodes[1].get_our_node_id());
1091                                         chan_b_disconnected = true;
1092                                         drain_msg_events_on_disconnect!(2);
1093                                 }
1094                         },
1095                         0x0e => {
1096                                 if chan_a_disconnected {
1097                                         nodes[0].peer_connected(&nodes[1].get_our_node_id(), &Init {
1098                                                 features: nodes[1].init_features(), networks: None, remote_network_address: None
1099                                         }, true).unwrap();
1100                                         nodes[1].peer_connected(&nodes[0].get_our_node_id(), &Init {
1101                                                 features: nodes[0].init_features(), networks: None, remote_network_address: None
1102                                         }, false).unwrap();
1103                                         chan_a_disconnected = false;
1104                                 }
1105                         },
1106                         0x0f => {
1107                                 if chan_b_disconnected {
1108                                         nodes[1].peer_connected(&nodes[2].get_our_node_id(), &Init {
1109                                                 features: nodes[2].init_features(), networks: None, remote_network_address: None
1110                                         }, true).unwrap();
1111                                         nodes[2].peer_connected(&nodes[1].get_our_node_id(), &Init {
1112                                                 features: nodes[1].init_features(), networks: None, remote_network_address: None
1113                                         }, false).unwrap();
1114                                         chan_b_disconnected = false;
1115                                 }
1116                         },
1117
1118                         0x10 => { process_msg_events!(0, true, ProcessMessages::AllMessages); },
1119                         0x11 => { process_msg_events!(0, false, ProcessMessages::AllMessages); },
1120                         0x12 => { process_msg_events!(0, true, ProcessMessages::OneMessage); },
1121                         0x13 => { process_msg_events!(0, false, ProcessMessages::OneMessage); },
1122                         0x14 => { process_msg_events!(0, true, ProcessMessages::OnePendingMessage); },
1123                         0x15 => { process_msg_events!(0, false, ProcessMessages::OnePendingMessage); },
1124
1125                         0x16 => { process_events!(0, true); },
1126                         0x17 => { process_events!(0, false); },
1127
1128                         0x18 => { process_msg_events!(1, true, ProcessMessages::AllMessages); },
1129                         0x19 => { process_msg_events!(1, false, ProcessMessages::AllMessages); },
1130                         0x1a => { process_msg_events!(1, true, ProcessMessages::OneMessage); },
1131                         0x1b => { process_msg_events!(1, false, ProcessMessages::OneMessage); },
1132                         0x1c => { process_msg_events!(1, true, ProcessMessages::OnePendingMessage); },
1133                         0x1d => { process_msg_events!(1, false, ProcessMessages::OnePendingMessage); },
1134
1135                         0x1e => { process_events!(1, true); },
1136                         0x1f => { process_events!(1, false); },
1137
1138                         0x20 => { process_msg_events!(2, true, ProcessMessages::AllMessages); },
1139                         0x21 => { process_msg_events!(2, false, ProcessMessages::AllMessages); },
1140                         0x22 => { process_msg_events!(2, true, ProcessMessages::OneMessage); },
1141                         0x23 => { process_msg_events!(2, false, ProcessMessages::OneMessage); },
1142                         0x24 => { process_msg_events!(2, true, ProcessMessages::OnePendingMessage); },
1143                         0x25 => { process_msg_events!(2, false, ProcessMessages::OnePendingMessage); },
1144
1145                         0x26 => { process_events!(2, true); },
1146                         0x27 => { process_events!(2, false); },
1147
1148                         0x2c => {
1149                                 if !chan_a_disconnected {
1150                                         nodes[1].peer_disconnected(&nodes[0].get_our_node_id());
1151                                         chan_a_disconnected = true;
1152                                         push_excess_b_events!(nodes[1].get_and_clear_pending_msg_events().drain(..), Some(0));
1153                                         ab_events.clear();
1154                                         ba_events.clear();
1155                                 }
1156                                 let (new_node_a, new_monitor_a) = reload_node!(node_a_ser, 0, monitor_a, keys_manager_a, fee_est_a);
1157                                 nodes[0] = new_node_a;
1158                                 monitor_a = new_monitor_a;
1159                         },
1160                         0x2d => {
1161                                 if !chan_a_disconnected {
1162                                         nodes[0].peer_disconnected(&nodes[1].get_our_node_id());
1163                                         chan_a_disconnected = true;
1164                                         nodes[0].get_and_clear_pending_msg_events();
1165                                         ab_events.clear();
1166                                         ba_events.clear();
1167                                 }
1168                                 if !chan_b_disconnected {
1169                                         nodes[2].peer_disconnected(&nodes[1].get_our_node_id());
1170                                         chan_b_disconnected = true;
1171                                         nodes[2].get_and_clear_pending_msg_events();
1172                                         bc_events.clear();
1173                                         cb_events.clear();
1174                                 }
1175                                 let (new_node_b, new_monitor_b) = reload_node!(node_b_ser, 1, monitor_b, keys_manager_b, fee_est_b);
1176                                 nodes[1] = new_node_b;
1177                                 monitor_b = new_monitor_b;
1178                         },
1179                         0x2e => {
1180                                 if !chan_b_disconnected {
1181                                         nodes[1].peer_disconnected(&nodes[2].get_our_node_id());
1182                                         chan_b_disconnected = true;
1183                                         push_excess_b_events!(nodes[1].get_and_clear_pending_msg_events().drain(..), Some(2));
1184                                         bc_events.clear();
1185                                         cb_events.clear();
1186                                 }
1187                                 let (new_node_c, new_monitor_c) = reload_node!(node_c_ser, 2, monitor_c, keys_manager_c, fee_est_c);
1188                                 nodes[2] = new_node_c;
1189                                 monitor_c = new_monitor_c;
1190                         },
1191
1192                         // 1/10th the channel size:
1193                         0x30 => { send_payment(&nodes[0], &nodes[1], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1194                         0x31 => { send_payment(&nodes[1], &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1195                         0x32 => { send_payment(&nodes[1], &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1196                         0x33 => { send_payment(&nodes[2], &nodes[1], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1197                         0x34 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx); },
1198                         0x35 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx); },
1199
1200                         0x38 => { send_payment(&nodes[0], &nodes[1], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1201                         0x39 => { send_payment(&nodes[1], &nodes[0], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1202                         0x3a => { send_payment(&nodes[1], &nodes[2], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1203                         0x3b => { send_payment(&nodes[2], &nodes[1], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1204                         0x3c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1_000_000, &mut payment_id, &mut payment_idx); },
1205                         0x3d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1_000_000, &mut payment_id, &mut payment_idx); },
1206
1207                         0x40 => { send_payment(&nodes[0], &nodes[1], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1208                         0x41 => { send_payment(&nodes[1], &nodes[0], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1209                         0x42 => { send_payment(&nodes[1], &nodes[2], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1210                         0x43 => { send_payment(&nodes[2], &nodes[1], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1211                         0x44 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 100_000, &mut payment_id, &mut payment_idx); },
1212                         0x45 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 100_000, &mut payment_id, &mut payment_idx); },
1213
1214                         0x48 => { send_payment(&nodes[0], &nodes[1], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1215                         0x49 => { send_payment(&nodes[1], &nodes[0], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1216                         0x4a => { send_payment(&nodes[1], &nodes[2], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1217                         0x4b => { send_payment(&nodes[2], &nodes[1], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1218                         0x4c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10_000, &mut payment_id, &mut payment_idx); },
1219                         0x4d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10_000, &mut payment_id, &mut payment_idx); },
1220
1221                         0x50 => { send_payment(&nodes[0], &nodes[1], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1222                         0x51 => { send_payment(&nodes[1], &nodes[0], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1223                         0x52 => { send_payment(&nodes[1], &nodes[2], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1224                         0x53 => { send_payment(&nodes[2], &nodes[1], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1225                         0x54 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1_000, &mut payment_id, &mut payment_idx); },
1226                         0x55 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1_000, &mut payment_id, &mut payment_idx); },
1227
1228                         0x58 => { send_payment(&nodes[0], &nodes[1], chan_a, 100, &mut payment_id, &mut payment_idx); },
1229                         0x59 => { send_payment(&nodes[1], &nodes[0], chan_a, 100, &mut payment_id, &mut payment_idx); },
1230                         0x5a => { send_payment(&nodes[1], &nodes[2], chan_b, 100, &mut payment_id, &mut payment_idx); },
1231                         0x5b => { send_payment(&nodes[2], &nodes[1], chan_b, 100, &mut payment_id, &mut payment_idx); },
1232                         0x5c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 100, &mut payment_id, &mut payment_idx); },
1233                         0x5d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 100, &mut payment_id, &mut payment_idx); },
1234
1235                         0x60 => { send_payment(&nodes[0], &nodes[1], chan_a, 10, &mut payment_id, &mut payment_idx); },
1236                         0x61 => { send_payment(&nodes[1], &nodes[0], chan_a, 10, &mut payment_id, &mut payment_idx); },
1237                         0x62 => { send_payment(&nodes[1], &nodes[2], chan_b, 10, &mut payment_id, &mut payment_idx); },
1238                         0x63 => { send_payment(&nodes[2], &nodes[1], chan_b, 10, &mut payment_id, &mut payment_idx); },
1239                         0x64 => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 10, &mut payment_id, &mut payment_idx); },
1240                         0x65 => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 10, &mut payment_id, &mut payment_idx); },
1241
1242                         0x68 => { send_payment(&nodes[0], &nodes[1], chan_a, 1, &mut payment_id, &mut payment_idx); },
1243                         0x69 => { send_payment(&nodes[1], &nodes[0], chan_a, 1, &mut payment_id, &mut payment_idx); },
1244                         0x6a => { send_payment(&nodes[1], &nodes[2], chan_b, 1, &mut payment_id, &mut payment_idx); },
1245                         0x6b => { send_payment(&nodes[2], &nodes[1], chan_b, 1, &mut payment_id, &mut payment_idx); },
1246                         0x6c => { send_hop_payment(&nodes[0], &nodes[1], chan_a, &nodes[2], chan_b, 1, &mut payment_id, &mut payment_idx); },
1247                         0x6d => { send_hop_payment(&nodes[2], &nodes[1], chan_b, &nodes[0], chan_a, 1, &mut payment_id, &mut payment_idx); },
1248
1249                         0x80 => {
1250                                 let mut max_feerate = last_htlc_clear_fee_a;
1251                                 if !anchors {
1252                                         max_feerate *= FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1253                                 }
1254                                 if fee_est_a.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1255                                         fee_est_a.ret_val.store(max_feerate, atomic::Ordering::Release);
1256                                 }
1257                                 nodes[0].maybe_update_chan_fees();
1258                         },
1259                         0x81 => { fee_est_a.ret_val.store(253, atomic::Ordering::Release); nodes[0].maybe_update_chan_fees(); },
1260
1261                         0x84 => {
1262                                 let mut max_feerate = last_htlc_clear_fee_b;
1263                                 if !anchors {
1264                                         max_feerate *= FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1265                                 }
1266                                 if fee_est_b.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1267                                         fee_est_b.ret_val.store(max_feerate, atomic::Ordering::Release);
1268                                 }
1269                                 nodes[1].maybe_update_chan_fees();
1270                         },
1271                         0x85 => { fee_est_b.ret_val.store(253, atomic::Ordering::Release); nodes[1].maybe_update_chan_fees(); },
1272
1273                         0x88 => {
1274                                 let mut max_feerate = last_htlc_clear_fee_c;
1275                                 if !anchors {
1276                                         max_feerate *= FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE as u32;
1277                                 }
1278                                 if fee_est_c.ret_val.fetch_add(250, atomic::Ordering::AcqRel) + 250 > max_feerate {
1279                                         fee_est_c.ret_val.store(max_feerate, atomic::Ordering::Release);
1280                                 }
1281                                 nodes[2].maybe_update_chan_fees();
1282                         },
1283                         0x89 => { fee_est_c.ret_val.store(253, atomic::Ordering::Release); nodes[2].maybe_update_chan_fees(); },
1284
1285                         0xf0 => {
1286                                 let pending_updates = monitor_a.chain_monitor.list_pending_monitor_updates().remove(&chan_1_funding).unwrap();
1287                                 if let Some(id) = pending_updates.get(0) {
1288                                         monitor_a.chain_monitor.channel_monitor_updated(chan_1_funding, *id).unwrap();
1289                                 }
1290                                 nodes[0].process_monitor_events();
1291                         }
1292                         0xf1 => {
1293                                 let pending_updates = monitor_a.chain_monitor.list_pending_monitor_updates().remove(&chan_1_funding).unwrap();
1294                                 if let Some(id) = pending_updates.get(1) {
1295                                         monitor_a.chain_monitor.channel_monitor_updated(chan_1_funding, *id).unwrap();
1296                                 }
1297                                 nodes[0].process_monitor_events();
1298                         }
1299                         0xf2 => {
1300                                 let pending_updates = monitor_a.chain_monitor.list_pending_monitor_updates().remove(&chan_1_funding).unwrap();
1301                                 if let Some(id) = pending_updates.last() {
1302                                         monitor_a.chain_monitor.channel_monitor_updated(chan_1_funding, *id).unwrap();
1303                                 }
1304                                 nodes[0].process_monitor_events();
1305                         }
1306
1307                         0xf4 => {
1308                                 let pending_updates = monitor_b.chain_monitor.list_pending_monitor_updates().remove(&chan_1_funding).unwrap();
1309                                 if let Some(id) = pending_updates.get(0) {
1310                                         monitor_b.chain_monitor.channel_monitor_updated(chan_1_funding, *id).unwrap();
1311                                 }
1312                                 nodes[1].process_monitor_events();
1313                         }
1314                         0xf5 => {
1315                                 let pending_updates = monitor_b.chain_monitor.list_pending_monitor_updates().remove(&chan_1_funding).unwrap();
1316                                 if let Some(id) = pending_updates.get(1) {
1317                                         monitor_b.chain_monitor.channel_monitor_updated(chan_1_funding, *id).unwrap();
1318                                 }
1319                                 nodes[1].process_monitor_events();
1320                         }
1321                         0xf6 => {
1322                                 let pending_updates = monitor_b.chain_monitor.list_pending_monitor_updates().remove(&chan_1_funding).unwrap();
1323                                 if let Some(id) = pending_updates.last() {
1324                                         monitor_b.chain_monitor.channel_monitor_updated(chan_1_funding, *id).unwrap();
1325                                 }
1326                                 nodes[1].process_monitor_events();
1327                         }
1328
1329                         0xf8 => {
1330                                 let pending_updates = monitor_b.chain_monitor.list_pending_monitor_updates().remove(&chan_2_funding).unwrap();
1331                                 if let Some(id) = pending_updates.get(0) {
1332                                         monitor_b.chain_monitor.channel_monitor_updated(chan_2_funding, *id).unwrap();
1333                                 }
1334                                 nodes[1].process_monitor_events();
1335                         }
1336                         0xf9 => {
1337                                 let pending_updates = monitor_b.chain_monitor.list_pending_monitor_updates().remove(&chan_2_funding).unwrap();
1338                                 if let Some(id) = pending_updates.get(1) {
1339                                         monitor_b.chain_monitor.channel_monitor_updated(chan_2_funding, *id).unwrap();
1340                                 }
1341                                 nodes[1].process_monitor_events();
1342                         }
1343                         0xfa => {
1344                                 let pending_updates = monitor_b.chain_monitor.list_pending_monitor_updates().remove(&chan_2_funding).unwrap();
1345                                 if let Some(id) = pending_updates.last() {
1346                                         monitor_b.chain_monitor.channel_monitor_updated(chan_2_funding, *id).unwrap();
1347                                 }
1348                                 nodes[1].process_monitor_events();
1349                         }
1350
1351                         0xfc => {
1352                                 let pending_updates = monitor_c.chain_monitor.list_pending_monitor_updates().remove(&chan_2_funding).unwrap();
1353                                 if let Some(id) = pending_updates.get(0) {
1354                                         monitor_c.chain_monitor.channel_monitor_updated(chan_2_funding, *id).unwrap();
1355                                 }
1356                                 nodes[2].process_monitor_events();
1357                         }
1358                         0xfd => {
1359                                 let pending_updates = monitor_c.chain_monitor.list_pending_monitor_updates().remove(&chan_2_funding).unwrap();
1360                                 if let Some(id) = pending_updates.get(1) {
1361                                         monitor_c.chain_monitor.channel_monitor_updated(chan_2_funding, *id).unwrap();
1362                                 }
1363                                 nodes[2].process_monitor_events();
1364                         }
1365                         0xfe => {
1366                                 let pending_updates = monitor_c.chain_monitor.list_pending_monitor_updates().remove(&chan_2_funding).unwrap();
1367                                 if let Some(id) = pending_updates.last() {
1368                                         monitor_c.chain_monitor.channel_monitor_updated(chan_2_funding, *id).unwrap();
1369                                 }
1370                                 nodes[2].process_monitor_events();
1371                         }
1372
1373                         0xff => {
1374                                 // Test that no channel is in a stuck state where neither party can send funds even
1375                                 // after we resolve all pending events.
1376                                 // First make sure there are no pending monitor updates, resetting the error state
1377                                 // and calling force_channel_monitor_updated for each monitor.
1378                                 *monitor_a.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1379                                 *monitor_b.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1380                                 *monitor_c.persister.update_ret.lock().unwrap() = ChannelMonitorUpdateStatus::Completed;
1381
1382                                 if let Some((id, _)) = monitor_a.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1383                                         monitor_a.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
1384                                         nodes[0].process_monitor_events();
1385                                 }
1386                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_1_funding) {
1387                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_1_funding, *id);
1388                                         nodes[1].process_monitor_events();
1389                                 }
1390                                 if let Some((id, _)) = monitor_b.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1391                                         monitor_b.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1392                                         nodes[1].process_monitor_events();
1393                                 }
1394                                 if let Some((id, _)) = monitor_c.latest_monitors.lock().unwrap().get(&chan_2_funding) {
1395                                         monitor_c.chain_monitor.force_channel_monitor_updated(chan_2_funding, *id);
1396                                         nodes[2].process_monitor_events();
1397                                 }
1398
1399                                 // Next, make sure peers are all connected to each other
1400                                 if chan_a_disconnected {
1401                                         nodes[0].peer_connected(&nodes[1].get_our_node_id(), &Init {
1402                                                 features: nodes[1].init_features(), networks: None, remote_network_address: None
1403                                         }, true).unwrap();
1404                                         nodes[1].peer_connected(&nodes[0].get_our_node_id(), &Init {
1405                                                 features: nodes[0].init_features(), networks: None, remote_network_address: None
1406                                         }, false).unwrap();
1407                                         chan_a_disconnected = false;
1408                                 }
1409                                 if chan_b_disconnected {
1410                                         nodes[1].peer_connected(&nodes[2].get_our_node_id(), &Init {
1411                                                 features: nodes[2].init_features(), networks: None, remote_network_address: None
1412                                         }, true).unwrap();
1413                                         nodes[2].peer_connected(&nodes[1].get_our_node_id(), &Init {
1414                                                 features: nodes[1].init_features(), networks: None, remote_network_address: None
1415                                         }, false).unwrap();
1416                                         chan_b_disconnected = false;
1417                                 }
1418
1419                                 for i in 0..std::usize::MAX {
1420                                         if i == 100 { panic!("It may take may iterations to settle the state, but it should not take forever"); }
1421                                         // Then, make sure any current forwards make their way to their destination
1422                                         if process_msg_events!(0, false, ProcessMessages::AllMessages) { continue; }
1423                                         if process_msg_events!(1, false, ProcessMessages::AllMessages) { continue; }
1424                                         if process_msg_events!(2, false, ProcessMessages::AllMessages) { continue; }
1425                                         // ...making sure any pending PendingHTLCsForwardable events are handled and
1426                                         // payments claimed.
1427                                         if process_events!(0, false) { continue; }
1428                                         if process_events!(1, false) { continue; }
1429                                         if process_events!(2, false) { continue; }
1430                                         break;
1431                                 }
1432
1433                                 // Finally, make sure that at least one end of each channel can make a substantial payment
1434                                 assert!(
1435                                         send_payment(&nodes[0], &nodes[1], chan_a, 10_000_000, &mut payment_id, &mut payment_idx) ||
1436                                         send_payment(&nodes[1], &nodes[0], chan_a, 10_000_000, &mut payment_id, &mut payment_idx));
1437                                 assert!(
1438                                         send_payment(&nodes[1], &nodes[2], chan_b, 10_000_000, &mut payment_id, &mut payment_idx) ||
1439                                         send_payment(&nodes[2], &nodes[1], chan_b, 10_000_000, &mut payment_id, &mut payment_idx));
1440
1441                                 last_htlc_clear_fee_a = fee_est_a.ret_val.load(atomic::Ordering::Acquire);
1442                                 last_htlc_clear_fee_b = fee_est_b.ret_val.load(atomic::Ordering::Acquire);
1443                                 last_htlc_clear_fee_c = fee_est_c.ret_val.load(atomic::Ordering::Acquire);
1444                         },
1445                         _ => test_return!(),
1446                 }
1447
1448                 if nodes[0].get_and_clear_needs_persistence() == true {
1449                         node_a_ser.0.clear();
1450                         nodes[0].write(&mut node_a_ser).unwrap();
1451                 }
1452                 if nodes[1].get_and_clear_needs_persistence() == true {
1453                         node_b_ser.0.clear();
1454                         nodes[1].write(&mut node_b_ser).unwrap();
1455                 }
1456                 if nodes[2].get_and_clear_needs_persistence() == true {
1457                         node_c_ser.0.clear();
1458                         nodes[2].write(&mut node_c_ser).unwrap();
1459                 }
1460         }
1461 }
1462
1463 /// We actually have different behavior based on if a certain log string has been seen, so we have
1464 /// to do a bit more tracking.
1465 #[derive(Clone)]
1466 struct SearchingOutput<O: Output> {
1467         output: O,
1468         may_fail: Arc<atomic::AtomicBool>,
1469 }
1470 impl<O: Output> Output for SearchingOutput<O> {
1471         fn locked_write(&self, data: &[u8]) {
1472                 // We hit a design limitation of LN state machine (see CONCURRENT_INBOUND_HTLC_FEE_BUFFER)
1473                 if std::str::from_utf8(data).unwrap().contains("Outbound update_fee HTLC buffer overflow - counterparty should force-close this channel") {
1474                         self.may_fail.store(true, atomic::Ordering::Release);
1475                 }
1476                 self.output.locked_write(data)
1477         }
1478 }
1479 impl<O: Output> SearchingOutput<O> {
1480         pub fn new(output: O) -> Self {
1481                 Self { output, may_fail: Arc::new(atomic::AtomicBool::new(false)) }
1482         }
1483 }
1484
1485 pub fn chanmon_consistency_test<Out: Output>(data: &[u8], out: Out) {
1486         do_test(data, out.clone(), false);
1487         do_test(data, out, true);
1488 }
1489
1490 #[no_mangle]
1491 pub extern "C" fn chanmon_consistency_run(data: *const u8, datalen: usize) {
1492         do_test(unsafe { std::slice::from_raw_parts(data, datalen) }, test_logger::DevNull{}, false);
1493         do_test(unsafe { std::slice::from_raw_parts(data, datalen) }, test_logger::DevNull{}, true);
1494 }