_ Git - rust-lightning/blob - fuzz/fuzz_targets/chanmon_fail_consistency.rs

   1 //! Test that monitor update failures don't get our channel state out of sync.
   2 //! One of the biggest concern with the monitor update failure handling code is that messages
   3 //! resent after monitor updating is restored are delivered out-of-order, resulting in
   4 //! commitment_signed messages having "invalid signatures".
   5 //! To test this we stand up a network of three nodes and read bytes from the fuzz input to denote
   6 //! actions such as sending payments, handling events, or changing monitor update return values on
   7 //! a per-node basis. This should allow it to find any cases where the ordering of actions results
   8 //! in us getting out of sync with ourselves, and, assuming at least one of our recieve- or
   9 //! send-side handling is correct, other peers. We consider it a failure if any action results in a
  10 //! channel being force-closed.
  11
  12 //Uncomment this for libfuzzer builds:
  13 //#![no_main]
  14
  15 extern crate bitcoin;
  16 extern crate bitcoin_hashes;
  17 extern crate lightning;
  18 extern crate secp256k1;
  19
  20 use bitcoin::BitcoinHash;
  21 use bitcoin::blockdata::block::BlockHeader;
  22 use bitcoin::blockdata::transaction::{Transaction, TxOut};
  23 use bitcoin::blockdata::script::{Builder, Script};
  24 use bitcoin::blockdata::opcodes;
  25 use bitcoin::network::constants::Network;
  26
  27 use bitcoin_hashes::Hash as TraitImport;
  28 use bitcoin_hashes::hash160::Hash as Hash160;
  29 use bitcoin_hashes::sha256::Hash as Sha256;
  30
  31 use lightning::chain::chaininterface;
  32 use lightning::chain::transaction::OutPoint;
  33 use lightning::chain::chaininterface::{BroadcasterInterface,ConfirmationTarget,ChainListener,FeeEstimator,ChainWatchInterfaceUtil};
  34 use lightning::chain::keysinterface::{ChannelKeys, KeysInterface};
  35 use lightning::ln::channelmonitor;
  36 use lightning::ln::channelmonitor::{ChannelMonitorUpdateErr, HTLCUpdate};
  37 use lightning::ln::channelmanager::{ChannelManager, PaymentHash, PaymentPreimage};
  38 use lightning::ln::router::{Route, RouteHop};
  39 use lightning::ln::msgs::{CommitmentUpdate, ChannelMessageHandler, ErrorAction, HandleError, UpdateAddHTLC};
  40 use lightning::util::{reset_rng_state, fill_bytes, events};
  41 use lightning::util::logger::Logger;
  42 use lightning::util::config::UserConfig;
  43 use lightning::util::events::{EventsProvider, MessageSendEventsProvider};
  44 use lightning::util::ser::{Readable, Writeable};
  45
  46 mod utils;
  47 use utils::test_logger;
  48
  49 use secp256k1::key::{PublicKey,SecretKey};
  50 use secp256k1::Secp256k1;
  51
  52 use std::cmp::Ordering;
  53 use std::collections::HashSet;
  54 use std::sync::{Arc,Mutex};
  55 use std::io::Cursor;
  56
  57 struct FuzzEstimator {}
  58 impl FeeEstimator for FuzzEstimator {
  59         fn get_est_sat_per_1000_weight(&self, _: ConfirmationTarget) -> u64 {
  60                 253
  61         }
  62 }
  63
  64 pub struct TestBroadcaster {}
  65 impl BroadcasterInterface for TestBroadcaster {
  66         fn broadcast_transaction(&self, _tx: &Transaction) { }
  67 }
  68
  69 pub struct TestChannelMonitor {
  70         pub simple_monitor: Arc<channelmonitor::SimpleManyChannelMonitor<OutPoint>>,
  71         pub update_ret: Mutex<Result<(), channelmonitor::ChannelMonitorUpdateErr>>,
  72 }
  73 impl TestChannelMonitor {
  74         pub fn new(chain_monitor: Arc<chaininterface::ChainWatchInterface>, broadcaster: Arc<chaininterface::BroadcasterInterface>, logger: Arc<Logger>) -> Self {
  75                 Self {
  76                         simple_monitor: channelmonitor::SimpleManyChannelMonitor::new(chain_monitor, broadcaster, logger),
  77                         update_ret: Mutex::new(Ok(())),
  78                 }
  79         }
  80 }
  81 impl channelmonitor::ManyChannelMonitor for TestChannelMonitor {
  82         fn add_update_monitor(&self, funding_txo: OutPoint, monitor: channelmonitor::ChannelMonitor) -> Result<(), channelmonitor::ChannelMonitorUpdateErr> {
  83                 assert!(self.simple_monitor.add_update_monitor(funding_txo, monitor).is_ok());
  84                 self.update_ret.lock().unwrap().clone()
  85         }
  86
  87         fn fetch_pending_htlc_updated(&self) -> Vec<HTLCUpdate> {
  88                 return self.simple_monitor.fetch_pending_htlc_updated();
  89         }
  90 }
  91
  92 struct KeyProvider {
  93         node_id: u8,
  94 }
  95 impl KeysInterface for KeyProvider {
  96         fn get_node_secret(&self) -> SecretKey {
  97                 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, self.node_id]).unwrap()
  98         }
  99
 100         fn get_destination_script(&self) -> Script {
 101                 let secp_ctx = Secp256k1::signing_only();
 102                 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_id]).unwrap();
 103                 let our_channel_monitor_claim_key_hash = Hash160::hash(&PublicKey::from_secret_key(&secp_ctx, &channel_monitor_claim_key).serialize());
 104                 Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0).push_slice(&our_channel_monitor_claim_key_hash[..]).into_script()
 105         }
 106
 107         fn get_shutdown_pubkey(&self) -> PublicKey {
 108                 let secp_ctx = Secp256k1::signing_only();
 109                 PublicKey::from_secret_key(&secp_ctx, &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_id]).unwrap())
 110         }
 111
 112         fn get_channel_keys(&self, _inbound: bool) -> ChannelKeys {
 113                 ChannelKeys {
 114                         funding_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, 4, self.node_id]).unwrap(),
 115                         revocation_base_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, 5, self.node_id]).unwrap(),
 116                         payment_base_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, 6, self.node_id]).unwrap(),
 117                         delayed_payment_base_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, 7, self.node_id]).unwrap(),
 118                         htlc_base_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, 8, self.node_id]).unwrap(),
 119                         commitment_seed: [0, 0, 0, 0, 0, 0, 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_id],
 120                 }
 121         }
 122
 123         fn get_session_key(&self) -> SecretKey {
 124                 let mut session_key = [0; 32];
 125                 fill_bytes(&mut session_key);
 126                 SecretKey::from_slice(&session_key).unwrap()
 127         }
 128
 129         fn get_channel_id(&self) -> [u8; 32] {
 130                 let mut channel_id = [0; 32];
 131                 fill_bytes(&mut channel_id);
 132                 channel_id
 133         }
 134 }
 135
 136 #[inline]
 137 pub fn do_test(data: &[u8]) {
 138         reset_rng_state();
 139
 140         let fee_est = Arc::new(FuzzEstimator{});
 141         let broadcast = Arc::new(TestBroadcaster{});
 142
 143         macro_rules! make_node {
 144                 ($node_id: expr) => { {
 145                         let logger: Arc<Logger> = Arc::new(test_logger::TestLogger::new($node_id.to_string()));
 146                         let watch = Arc::new(ChainWatchInterfaceUtil::new(Network::Bitcoin, Arc::clone(&logger)));
 147                         let monitor = Arc::new(TestChannelMonitor::new(watch.clone(), broadcast.clone(), logger.clone()));
 148
 149                         let keys_manager = Arc::new(KeyProvider { node_id: $node_id });
 150                         let mut config = UserConfig::new();
 151                         config.channel_options.fee_proportional_millionths = 0;
 152                         config.channel_options.announced_channel = true;
 153                         config.channel_limits.min_dust_limit_satoshis = 0;
 154                         (ChannelManager::new(Network::Bitcoin, fee_est.clone(), monitor.clone(), watch.clone(), broadcast.clone(), Arc::clone(&logger), keys_manager.clone(), config).unwrap(),
 155                         monitor)
 156                 } }
 157         }
 158
 159         let mut channel_txn = Vec::new();
 160         macro_rules! make_channel {
 161                 ($source: expr, $dest: expr, $chan_id: expr) => { {
 162                         $source.create_channel($dest.get_our_node_id(), 10000000, 42, 0).unwrap();
 163                         let open_channel = {
 164                                 let events = $source.get_and_clear_pending_msg_events();
 165                                 assert_eq!(events.len(), 1);
 166                                 if let events::MessageSendEvent::SendOpenChannel { ref msg, .. } = events[0] {
 167                                         msg.clone()
 168                                 } else { panic!("Wrong event type"); }
 169                         };
 170
 171                         $dest.handle_open_channel(&$source.get_our_node_id(), &open_channel).unwrap();
 172                         let accept_channel = {
 173                                 let events = $dest.get_and_clear_pending_msg_events();
 174                                 assert_eq!(events.len(), 1);
 175                                 if let events::MessageSendEvent::SendAcceptChannel { ref msg, .. } = events[0] {
 176                                         msg.clone()
 177                                 } else { panic!("Wrong event type"); }
 178                         };
 179
 180                         $source.handle_accept_channel(&$dest.get_our_node_id(), &accept_channel).unwrap();
 181                         {
 182                                 let events = $source.get_and_clear_pending_events();
 183                                 assert_eq!(events.len(), 1);
 184                                 if let events::Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, .. } = events[0] {
 185                                         let tx = Transaction { version: $chan_id, lock_time: 0, input: Vec::new(), output: vec![TxOut {
 186                                                 value: *channel_value_satoshis, script_pubkey: output_script.clone(),
 187                                         }]};
 188                                         let funding_output = OutPoint::new(tx.txid(), 0);
 189                                         $source.funding_transaction_generated(&temporary_channel_id, funding_output);
 190                                         channel_txn.push(tx);
 191                                 } else { panic!("Wrong event type"); }
 192                         }
 193
 194                         let funding_created = {
 195                                 let events = $source.get_and_clear_pending_msg_events();
 196                                 assert_eq!(events.len(), 1);
 197                                 if let events::MessageSendEvent::SendFundingCreated { ref msg, .. } = events[0] {
 198                                         msg.clone()
 199                                 } else { panic!("Wrong event type"); }
 200                         };
 201                         $dest.handle_funding_created(&$source.get_our_node_id(), &funding_created).unwrap();
 202
 203                         let funding_signed = {
 204                                 let events = $dest.get_and_clear_pending_msg_events();
 205                                 assert_eq!(events.len(), 1);
 206                                 if let events::MessageSendEvent::SendFundingSigned { ref msg, .. } = events[0] {
 207                                         msg.clone()
 208                                 } else { panic!("Wrong event type"); }
 209                         };
 210                         $source.handle_funding_signed(&$dest.get_our_node_id(), &funding_signed).unwrap();
 211
 212                         {
 213                                 let events = $source.get_and_clear_pending_events();
 214                                 assert_eq!(events.len(), 1);
 215                                 if let events::Event::FundingBroadcastSafe { .. } = events[0] {
 216                                 } else { panic!("Wrong event type"); }
 217                         }
 218                 } }
 219         }
 220
 221         macro_rules! confirm_txn {
 222                 ($node: expr) => { {
 223                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 224                         let mut txn = Vec::with_capacity(channel_txn.len());
 225                         let mut posn = Vec::with_capacity(channel_txn.len());
 226                         for i in 0..channel_txn.len() {
 227                                 txn.push(&channel_txn[i]);
 228                                 posn.push(i as u32 + 1);
 229                         }
 230                         $node.block_connected(&header, 1, &txn, &posn);
 231                         for i in 2..100 {
 232                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 233                                 $node.block_connected(&header, i, &Vec::new(), &[0; 0]);
 234                         }
 235                 } }
 236         }
 237
 238         macro_rules! lock_fundings {
 239                 ($nodes: expr) => { {
 240                         let mut node_events = Vec::new();
 241                         for node in $nodes.iter() {
 242                                 node_events.push(node.get_and_clear_pending_msg_events());
 243                         }
 244                         for (idx, node_event) in node_events.iter().enumerate() {
 245                                 for event in node_event {
 246                                         if let events::MessageSendEvent::SendFundingLocked { ref node_id, ref msg } = event {
 247                                                 for node in $nodes.iter() {
 248                                                         if node.get_our_node_id() == *node_id {
 249                                                                 node.handle_funding_locked(&$nodes[idx].get_our_node_id(), msg).unwrap();
 250                                                         }
 251                                                 }
 252                                         } else { panic!("Wrong event type"); }
 253                                 }
 254                         }
 255
 256                         for node in $nodes.iter() {
 257                                 let events = node.get_and_clear_pending_msg_events();
 258                                 for event in events {
 259                                         if let events::MessageSendEvent::SendAnnouncementSignatures { .. } = event {
 260                                         } else { panic!("Wrong event type"); }
 261                                 }
 262                         }
 263                 } }
 264         }
 265
 266         // 3 nodes is enough to hit all the possible cases, notably unknown-source-unknown-dest
 267         // forwarding.
 268         let (node_a, monitor_a) = make_node!(0);
 269         let (node_b, monitor_b) = make_node!(1);
 270         let (node_c, monitor_c) = make_node!(2);
 271
 272         let nodes = [node_a, node_b, node_c];
 273
 274         make_channel!(nodes[0], nodes[1], 0);
 275         make_channel!(nodes[1], nodes[2], 1);
 276
 277         for node in nodes.iter() {
 278                 confirm_txn!(node);
 279         }
 280
 281         lock_fundings!(nodes);
 282
 283         let chan_a = nodes[0].list_usable_channels()[0].short_channel_id.unwrap();
 284         let chan_b = nodes[2].list_usable_channels()[0].short_channel_id.unwrap();
 285
 286         let mut payment_id = 0;
 287
 288         let mut chan_a_disconnected = false;
 289         let mut chan_b_disconnected = false;
 290         let mut chan_a_reconnecting = false;
 291         let mut chan_b_reconnecting = false;
 292
 293         macro_rules! test_err {
 294                 ($res: expr) => {
 295                         match $res {
 296                                 Ok(()) => {},
 297                                 Err(HandleError { action: Some(ErrorAction::IgnoreError), .. }) => { },
 298                                 _ => { $res.unwrap() },
 299                         }
 300                 }
 301         }
 302
 303         macro_rules! test_return {
 304                 () => { {
 305                         assert_eq!(nodes[0].list_channels().len(), 1);
 306                         assert_eq!(nodes[1].list_channels().len(), 2);
 307                         assert_eq!(nodes[2].list_channels().len(), 1);
 308                         return;
 309                 } }
 310         }
 311
 312         let mut read_pos = 0;
 313         macro_rules! get_slice {
 314                 ($len: expr) => {
 315                         {
 316                                 let slice_len = $len as usize;
 317                                 if data.len() < read_pos + slice_len {
 318                                         test_return!();
 319                                 }
 320                                 read_pos += slice_len;
 321                                 &data[read_pos - slice_len..read_pos]
 322                         }
 323                 }
 324         }
 325
 326         loop {
 327                 macro_rules! send_payment {
 328                         ($source: expr, $dest: expr) => { {
 329                                 let payment_hash = Sha256::hash(&[payment_id; 1]);
 330                                 payment_id = payment_id.wrapping_add(1);
 331                                 if let Err(_) = $source.send_payment(Route {
 332                                         hops: vec![RouteHop {
 333                                                 pubkey: $dest.0.get_our_node_id(),
 334                                                 short_channel_id: $dest.1,
 335                                                 fee_msat: 5000000,
 336                                                 cltv_expiry_delta: 200,
 337                                         }],
 338                                 }, PaymentHash(payment_hash.into_inner())) {
 339                                         // Probably ran out of funds
 340                                         test_return!();
 341                                 }
 342                         } };
 343                         ($source: expr, $middle: expr, $dest: expr) => { {
 344                                 let payment_hash = Sha256::hash(&[payment_id; 1]);
 345                                 payment_id = payment_id.wrapping_add(1);
 346                                 if let Err(_) = $source.send_payment(Route {
 347                                         hops: vec![RouteHop {
 348                                                 pubkey: $middle.0.get_our_node_id(),
 349                                                 short_channel_id: $middle.1,
 350                                                 fee_msat: 50000,
 351                                                 cltv_expiry_delta: 100,
 352                                         },RouteHop {
 353                                                 pubkey: $dest.0.get_our_node_id(),
 354                                                 short_channel_id: $dest.1,
 355                                                 fee_msat: 5000000,
 356                                                 cltv_expiry_delta: 200,
 357                                         }],
 358                                 }, PaymentHash(payment_hash.into_inner())) {
 359                                         // Probably ran out of funds
 360                                         test_return!();
 361                                 }
 362                         } }
 363                 }
 364
 365                 macro_rules! process_msg_events {
 366                         ($node: expr, $corrupt_forward: expr) => { {
 367                                 for event in nodes[$node].get_and_clear_pending_msg_events() {
 368                                         match event {
 369                                                 events::MessageSendEvent::UpdateHTLCs { ref node_id, updates: CommitmentUpdate { ref update_add_htlcs, ref update_fail_htlcs, ref update_fulfill_htlcs, ref update_fail_malformed_htlcs, ref update_fee, ref commitment_signed } } => {
 370                                                         for (idx, dest) in nodes.iter().enumerate() {
 371                                                                 if dest.get_our_node_id() == *node_id &&
 372                                                                                 (($node != 0 && idx != 0) || !chan_a_disconnected) &&
 373                                                                                 (($node != 2 && idx != 2) || !chan_b_disconnected) {
 374                                                                         assert!(update_fee.is_none());
 375                                                                         for update_add in update_add_htlcs {
 376                                                                                 if !$corrupt_forward {
 377                                                                                         test_err!(dest.handle_update_add_htlc(&nodes[$node].get_our_node_id(), &update_add));
 378                                                                                 } else {
 379                                                                                         // Corrupt the update_add_htlc message so that its HMAC
 380                                                                                         // check will fail and we generate a
 381                                                                                         // update_fail_malformed_htlc instead of an
 382                                                                                         // update_fail_htlc as we do when we reject a payment.
 383                                                                                         let mut msg_ser = update_add.encode();
 384                                                                                         msg_ser[1000] ^= 0xff;
 385                                                                                         let new_msg = UpdateAddHTLC::read(&mut Cursor::new(&msg_ser)).unwrap();
 386                                                                                         test_err!(dest.handle_update_add_htlc(&nodes[$node].get_our_node_id(), &new_msg));
 387                                                                                 }
 388                                                                         }
 389                                                                         for update_fulfill in update_fulfill_htlcs {
 390                                                                                 test_err!(dest.handle_update_fulfill_htlc(&nodes[$node].get_our_node_id(), &update_fulfill));
 391                                                                         }
 392                                                                         for update_fail in update_fail_htlcs {
 393                                                                                 test_err!(dest.handle_update_fail_htlc(&nodes[$node].get_our_node_id(), &update_fail));
 394                                                                         }
 395                                                                         for update_fail_malformed in update_fail_malformed_htlcs {
 396                                                                                 test_err!(dest.handle_update_fail_malformed_htlc(&nodes[$node].get_our_node_id(), &update_fail_malformed));
 397                                                                         }
 398                                                                         test_err!(dest.handle_commitment_signed(&nodes[$node].get_our_node_id(), &commitment_signed));
 399                                                                 }
 400                                                         }
 401                                                 },
 402                                                 events::MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
 403                                                         for (idx, dest) in nodes.iter().enumerate() {
 404                                                                 if dest.get_our_node_id() == *node_id &&
 405                                                                                 (($node != 0 && idx != 0) || !chan_a_disconnected) &&
 406                                                                                 (($node != 2 && idx != 2) || !chan_b_disconnected) {
 407                                                                         test_err!(dest.handle_revoke_and_ack(&nodes[$node].get_our_node_id(), msg));
 408                                                                 }
 409                                                         }
 410                                                 },
 411                                                 events::MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
 412                                                         for (idx, dest) in nodes.iter().enumerate() {
 413                                                                 if dest.get_our_node_id() == *node_id {
 414                                                                         test_err!(dest.handle_channel_reestablish(&nodes[$node].get_our_node_id(), msg));
 415                                                                         if $node == 0 || idx == 0 {
 416                                                                                 chan_a_reconnecting = false;
 417                                                                                 chan_a_disconnected = false;
 418                                                                         } else {
 419                                                                                 chan_b_reconnecting = false;
 420                                                                                 chan_b_disconnected = false;
 421                                                                         }
 422                                                                 }
 423                                                         }
 424                                                 },
 425                                                 events::MessageSendEvent::SendFundingLocked { .. } => {
 426                                                         // Can be generated as a reestablish response
 427                                                 },
 428                                                 events::MessageSendEvent::PaymentFailureNetworkUpdate { .. } => {
 429                                                         // Can be generated due to a payment forward being rejected due to a
 430                                                         // channel having previously failed a monitor update
 431                                                 },
 432                                                 _ => panic!("Unhandled message event"),
 433                                         }
 434                                 }
 435                         } }
 436                 }
 437
 438                 macro_rules! process_events {
 439                         ($node: expr, $fail: expr) => { {
 440                                 // In case we get 256 payments we may have a hash collision, resulting in the
 441                                 // second claim/fail call not finding the duplicate-hash HTLC, so we have to
 442                                 // deduplicate the calls here.
 443                                 let mut claim_set = HashSet::new();
 444                                 let mut events = nodes[$node].get_and_clear_pending_events();
 445                                 // Sort events so that PendingHTLCsForwardable get processed last. This avoids a
 446                                 // case where we first process a PendingHTLCsForwardable, then claim/fail on a
 447                                 // PaymentReceived, claiming/failing two HTLCs, but leaving a just-generated
 448                                 // PaymentReceived event for the second HTLC in our pending_events (and breaking
 449                                 // our claim_set deduplication).
 450                                 events.sort_by(|a, b| {
 451                                         if let events::Event::PaymentReceived { .. } = a {
 452                                                 if let events::Event::PendingHTLCsForwardable { .. } = b {
 453                                                         Ordering::Less
 454                                                 } else { Ordering::Equal }
 455                                         } else if let events::Event::PendingHTLCsForwardable { .. } = a {
 456                                                 if let events::Event::PaymentReceived { .. } = b {
 457                                                         Ordering::Greater
 458                                                 } else { Ordering::Equal }
 459                                         } else { Ordering::Equal }
 460                                 });
 461                                 for event in events.drain(..) {
 462                                         match event {
 463                                                 events::Event::PaymentReceived { payment_hash, .. } => {
 464                                                         if claim_set.insert(payment_hash.0) {
 465                                                                 if $fail {
 466                                                                         assert!(nodes[$node].fail_htlc_backwards(&payment_hash));
 467                                                                 } else {
 468                                                                         assert!(nodes[$node].claim_funds(PaymentPreimage(payment_hash.0)));
 469                                                                 }
 470                                                         }
 471                                                 },
 472                                                 events::Event::PaymentSent { .. } => {},
 473                                                 events::Event::PaymentFailed { .. } => {},
 474                                                 events::Event::PendingHTLCsForwardable { .. } => {
 475                                                         nodes[$node].process_pending_htlc_forwards();
 476                                                 },
 477                                                 _ => panic!("Unhandled event"),
 478                                         }
 479                                 }
 480                         } }
 481                 }
 482
 483                 match get_slice!(1)[0] {
 484                         0x00 => *monitor_a.update_ret.lock().unwrap() = Err(ChannelMonitorUpdateErr::TemporaryFailure),
 485                         0x01 => *monitor_b.update_ret.lock().unwrap() = Err(ChannelMonitorUpdateErr::TemporaryFailure),
 486                         0x02 => *monitor_c.update_ret.lock().unwrap() = Err(ChannelMonitorUpdateErr::TemporaryFailure),
 487                         0x03 => *monitor_a.update_ret.lock().unwrap() = Ok(()),
 488                         0x04 => *monitor_b.update_ret.lock().unwrap() = Ok(()),
 489                         0x05 => *monitor_c.update_ret.lock().unwrap() = Ok(()),
 490                         0x06 => nodes[0].test_restore_channel_monitor(),
 491                         0x07 => nodes[1].test_restore_channel_monitor(),
 492                         0x08 => nodes[2].test_restore_channel_monitor(),
 493                         0x09 => send_payment!(nodes[0], (&nodes[1], chan_a)),
 494                         0x0a => send_payment!(nodes[1], (&nodes[0], chan_a)),
 495                         0x0b => send_payment!(nodes[1], (&nodes[2], chan_b)),
 496                         0x0c => send_payment!(nodes[2], (&nodes[1], chan_b)),
 497                         0x0d => send_payment!(nodes[0], (&nodes[1], chan_a), (&nodes[2], chan_b)),
 498                         0x0e => send_payment!(nodes[2], (&nodes[1], chan_b), (&nodes[0], chan_a)),
 499                         0x0f => {
 500                                 if !chan_a_disconnected {
 501                                         nodes[0].peer_disconnected(&nodes[1].get_our_node_id(), false);
 502                                         nodes[1].peer_disconnected(&nodes[0].get_our_node_id(), false);
 503                                         chan_a_disconnected = true;
 504                                 }
 505                         },
 506                         0x10 => {
 507                                 if !chan_b_disconnected {
 508                                         nodes[1].peer_disconnected(&nodes[2].get_our_node_id(), false);
 509                                         nodes[2].peer_disconnected(&nodes[1].get_our_node_id(), false);
 510                                         chan_b_disconnected = true;
 511                                 }
 512                         },
 513                         0x11 => {
 514                                 if chan_a_disconnected && !chan_a_reconnecting {
 515                                         nodes[0].peer_connected(&nodes[1].get_our_node_id());
 516                                         nodes[1].peer_connected(&nodes[0].get_our_node_id());
 517                                         chan_a_reconnecting = true;
 518                                 }
 519                         },
 520                         0x12 => {
 521                                 if chan_b_disconnected && !chan_b_reconnecting {
 522                                         nodes[1].peer_connected(&nodes[2].get_our_node_id());
 523                                         nodes[2].peer_connected(&nodes[1].get_our_node_id());
 524                                         chan_b_reconnecting = true;
 525                                 }
 526                         },
 527                         0x13 => process_msg_events!(0, true),
 528                         0x14 => process_msg_events!(0, false),
 529                         0x15 => process_events!(0, true),
 530                         0x16 => process_events!(0, false),
 531                         0x17 => process_msg_events!(1, true),
 532                         0x18 => process_msg_events!(1, false),
 533                         0x19 => process_events!(1, true),
 534                         0x1a => process_events!(1, false),
 535                         0x1b => process_msg_events!(2, true),
 536                         0x1c => process_msg_events!(2, false),
 537                         0x1d => process_events!(2, true),
 538                         0x1e => process_events!(2, false),
 539                         _ => test_return!(),
 540                 }
 541         }
 542 }
 543
 544 #[cfg(feature = "afl")]
 545 #[macro_use] extern crate afl;
 546 #[cfg(feature = "afl")]
 547 fn main() {
 548         fuzz!(|data| {
 549                 do_test(data);
 550         });
 551 }
 552
 553 #[cfg(feature = "honggfuzz")]
 554 #[macro_use] extern crate honggfuzz;
 555 #[cfg(feature = "honggfuzz")]
 556 fn main() {
 557         loop {
 558                 fuzz!(|data| {
 559                         do_test(data);
 560                 });
 561         }
 562 }
 563
 564 #[cfg(feature = "libfuzzer_fuzz")]
 565 #[macro_use] extern crate libfuzzer_sys;
 566 #[cfg(feature = "libfuzzer_fuzz")]
 567 fuzz_target!(|data: &[u8]| {
 568         do_test(data);
 569 });
 570
 571 extern crate hex;
 572 #[cfg(test)]
 573 mod tests {
 574         #[test]
 575         fn duplicate_crash() {
 576                 super::do_test(&::hex::decode("00").unwrap());
 577         }
 578 }