_ 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, LocalFeatures};
  40 use lightning::util::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::sync::atomic;
  56 use std::io::Cursor;
  57
  58 struct FuzzEstimator {}
  59 impl FeeEstimator for FuzzEstimator {
  60         fn get_est_sat_per_1000_weight(&self, _: ConfirmationTarget) -> u64 {
  61                 253
  62         }
  63 }
  64
  65 pub struct TestBroadcaster {}
  66 impl BroadcasterInterface for TestBroadcaster {
  67         fn broadcast_transaction(&self, _tx: &Transaction) { }
  68 }
  69
  70 pub struct TestChannelMonitor {
  71         pub simple_monitor: Arc<channelmonitor::SimpleManyChannelMonitor<OutPoint>>,
  72         pub update_ret: Mutex<Result<(), channelmonitor::ChannelMonitorUpdateErr>>,
  73 }
  74 impl TestChannelMonitor {
  75         pub fn new(chain_monitor: Arc<chaininterface::ChainWatchInterface>, broadcaster: Arc<chaininterface::BroadcasterInterface>, logger: Arc<Logger>, feeest: Arc<chaininterface::FeeEstimator>) -> Self {
  76                 Self {
  77                         simple_monitor: channelmonitor::SimpleManyChannelMonitor::new(chain_monitor, broadcaster, logger, feeest),
  78                         update_ret: Mutex::new(Ok(())),
  79                 }
  80         }
  81 }
  82 impl channelmonitor::ManyChannelMonitor for TestChannelMonitor {
  83         fn add_update_monitor(&self, funding_txo: OutPoint, monitor: channelmonitor::ChannelMonitor) -> Result<(), channelmonitor::ChannelMonitorUpdateErr> {
  84                 assert!(self.simple_monitor.add_update_monitor(funding_txo, monitor).is_ok());
  85                 self.update_ret.lock().unwrap().clone()
  86         }
  87
  88         fn fetch_pending_htlc_updated(&self) -> Vec<HTLCUpdate> {
  89                 return self.simple_monitor.fetch_pending_htlc_updated();
  90         }
  91 }
  92
  93 struct KeyProvider {
  94         node_id: u8,
  95         session_id: atomic::AtomicU8,
  96         channel_id: atomic::AtomicU8,
  97 }
  98 impl KeysInterface for KeyProvider {
  99         fn get_node_secret(&self) -> SecretKey {
 100                 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()
 101         }
 102
 103         fn get_destination_script(&self) -> Script {
 104                 let secp_ctx = Secp256k1::signing_only();
 105                 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();
 106                 let our_channel_monitor_claim_key_hash = Hash160::hash(&PublicKey::from_secret_key(&secp_ctx, &channel_monitor_claim_key).serialize());
 107                 Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0).push_slice(&our_channel_monitor_claim_key_hash[..]).into_script()
 108         }
 109
 110         fn get_shutdown_pubkey(&self) -> PublicKey {
 111                 let secp_ctx = Secp256k1::signing_only();
 112                 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())
 113         }
 114
 115         fn get_channel_keys(&self, _inbound: bool) -> ChannelKeys {
 116                 ChannelKeys {
 117                         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(),
 118                         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(),
 119                         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(),
 120                         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(),
 121                         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(),
 122                         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],
 123                 }
 124         }
 125
 126         fn get_session_key(&self) -> SecretKey {
 127                 let id = self.session_id.fetch_add(1, atomic::Ordering::Relaxed);
 128                 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, id, 10, self.node_id]).unwrap()
 129         }
 130
 131         fn get_channel_id(&self) -> [u8; 32] {
 132                 let id = self.channel_id.fetch_add(1, atomic::Ordering::Relaxed);
 133                 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, id, 11, self.node_id]
 134         }
 135 }
 136
 137 #[inline]
 138 pub fn do_test(data: &[u8]) {
 139         let fee_est = Arc::new(FuzzEstimator{});
 140         let broadcast = Arc::new(TestBroadcaster{});
 141
 142         macro_rules! make_node {
 143                 ($node_id: expr) => { {
 144                         let logger: Arc<Logger> = Arc::new(test_logger::TestLogger::new($node_id.to_string()));
 145                         let watch = Arc::new(ChainWatchInterfaceUtil::new(Network::Bitcoin, Arc::clone(&logger)));
 146                         let monitor = Arc::new(TestChannelMonitor::new(watch.clone(), broadcast.clone(), logger.clone(), fee_est.clone()));
 147
 148                         let keys_manager = Arc::new(KeyProvider { node_id: $node_id, session_id: atomic::AtomicU8::new(0), channel_id: atomic::AtomicU8::new(0) });
 149                         let mut config = UserConfig::new();
 150                         config.channel_options.fee_proportional_millionths = 0;
 151                         config.channel_options.announced_channel = true;
 152                         config.peer_channel_config_limits.min_dust_limit_satoshis = 0;
 153                         (ChannelManager::new(Network::Bitcoin, fee_est.clone(), monitor.clone(), watch.clone(), broadcast.clone(), Arc::clone(&logger), keys_manager.clone(), config).unwrap(),
 154                         monitor)
 155                 } }
 156         }
 157
 158         let mut channel_txn = Vec::new();
 159         macro_rules! make_channel {
 160                 ($source: expr, $dest: expr, $chan_id: expr) => { {
 161                         $source.create_channel($dest.get_our_node_id(), 10000000, 42, 0).unwrap();
 162                         let open_channel = {
 163                                 let events = $source.get_and_clear_pending_msg_events();
 164                                 assert_eq!(events.len(), 1);
 165                                 if let events::MessageSendEvent::SendOpenChannel { ref msg, .. } = events[0] {
 166                                         msg.clone()
 167                                 } else { panic!("Wrong event type"); }
 168                         };
 169
 170                         $dest.handle_open_channel(&$source.get_our_node_id(), LocalFeatures::new(), &open_channel).unwrap();
 171                         let accept_channel = {
 172                                 let events = $dest.get_and_clear_pending_msg_events();
 173                                 assert_eq!(events.len(), 1);
 174                                 if let events::MessageSendEvent::SendAcceptChannel { ref msg, .. } = events[0] {
 175                                         msg.clone()
 176                                 } else { panic!("Wrong event type"); }
 177                         };
 178
 179                         $source.handle_accept_channel(&$dest.get_our_node_id(), LocalFeatures::new(), &accept_channel).unwrap();
 180                         {
 181                                 let events = $source.get_and_clear_pending_events();
 182                                 assert_eq!(events.len(), 1);
 183                                 if let events::Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, .. } = events[0] {
 184                                         let tx = Transaction { version: $chan_id, lock_time: 0, input: Vec::new(), output: vec![TxOut {
 185                                                 value: *channel_value_satoshis, script_pubkey: output_script.clone(),
 186                                         }]};
 187                                         let funding_output = OutPoint::new(tx.txid(), 0);
 188                                         $source.funding_transaction_generated(&temporary_channel_id, funding_output);
 189                                         channel_txn.push(tx);
 190                                 } else { panic!("Wrong event type"); }
 191                         }
 192
 193                         let funding_created = {
 194                                 let events = $source.get_and_clear_pending_msg_events();
 195                                 assert_eq!(events.len(), 1);
 196                                 if let events::MessageSendEvent::SendFundingCreated { ref msg, .. } = events[0] {
 197                                         msg.clone()
 198                                 } else { panic!("Wrong event type"); }
 199                         };
 200                         $dest.handle_funding_created(&$source.get_our_node_id(), &funding_created).unwrap();
 201
 202                         let funding_signed = {
 203                                 let events = $dest.get_and_clear_pending_msg_events();
 204                                 assert_eq!(events.len(), 1);
 205                                 if let events::MessageSendEvent::SendFundingSigned { ref msg, .. } = events[0] {
 206                                         msg.clone()
 207                                 } else { panic!("Wrong event type"); }
 208                         };
 209                         $source.handle_funding_signed(&$dest.get_our_node_id(), &funding_signed).unwrap();
 210
 211                         {
 212                                 let events = $source.get_and_clear_pending_events();
 213                                 assert_eq!(events.len(), 1);
 214                                 if let events::Event::FundingBroadcastSafe { .. } = events[0] {
 215                                 } else { panic!("Wrong event type"); }
 216                         }
 217                 } }
 218         }
 219
 220         macro_rules! confirm_txn {
 221                 ($node: expr) => { {
 222                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 223                         let mut txn = Vec::with_capacity(channel_txn.len());
 224                         let mut posn = Vec::with_capacity(channel_txn.len());
 225                         for i in 0..channel_txn.len() {
 226                                 txn.push(&channel_txn[i]);
 227                                 posn.push(i as u32 + 1);
 228                         }
 229                         $node.block_connected(&header, 1, &txn, &posn);
 230                         for i in 2..100 {
 231                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 232                                 $node.block_connected(&header, i, &Vec::new(), &[0; 0]);
 233                         }
 234                 } }
 235         }
 236
 237         macro_rules! lock_fundings {
 238                 ($nodes: expr) => { {
 239                         let mut node_events = Vec::new();
 240                         for node in $nodes.iter() {
 241                                 node_events.push(node.get_and_clear_pending_msg_events());
 242                         }
 243                         for (idx, node_event) in node_events.iter().enumerate() {
 244                                 for event in node_event {
 245                                         if let events::MessageSendEvent::SendFundingLocked { ref node_id, ref msg } = event {
 246                                                 for node in $nodes.iter() {
 247                                                         if node.get_our_node_id() == *node_id {
 248                                                                 node.handle_funding_locked(&$nodes[idx].get_our_node_id(), msg).unwrap();
 249                                                         }
 250                                                 }
 251                                         } else { panic!("Wrong event type"); }
 252                                 }
 253                         }
 254
 255                         for node in $nodes.iter() {
 256                                 let events = node.get_and_clear_pending_msg_events();
 257                                 for event in events {
 258                                         if let events::MessageSendEvent::SendAnnouncementSignatures { .. } = event {
 259                                         } else { panic!("Wrong event type"); }
 260                                 }
 261                         }
 262                 } }
 263         }
 264
 265         // 3 nodes is enough to hit all the possible cases, notably unknown-source-unknown-dest
 266         // forwarding.
 267         let (node_a, monitor_a) = make_node!(0);
 268         let (node_b, monitor_b) = make_node!(1);
 269         let (node_c, monitor_c) = make_node!(2);
 270
 271         let nodes = [node_a, node_b, node_c];
 272
 273         make_channel!(nodes[0], nodes[1], 0);
 274         make_channel!(nodes[1], nodes[2], 1);
 275
 276         for node in nodes.iter() {
 277                 confirm_txn!(node);
 278         }
 279
 280         lock_fundings!(nodes);
 281
 282         let chan_a = nodes[0].list_usable_channels()[0].short_channel_id.unwrap();
 283         let chan_b = nodes[2].list_usable_channels()[0].short_channel_id.unwrap();
 284
 285         let mut payment_id = 0;
 286
 287         let mut chan_a_disconnected = false;
 288         let mut chan_b_disconnected = false;
 289         let mut chan_a_reconnecting = false;
 290         let mut chan_b_reconnecting = false;
 291
 292         macro_rules! test_err {
 293                 ($res: expr) => {
 294                         match $res {
 295                                 Ok(()) => {},
 296                                 Err(HandleError { action: Some(ErrorAction::IgnoreError), .. }) => { },
 297                                 _ => { $res.unwrap() },
 298                         }
 299                 }
 300         }
 301
 302         macro_rules! test_return {
 303                 () => { {
 304                         assert_eq!(nodes[0].list_channels().len(), 1);
 305                         assert_eq!(nodes[1].list_channels().len(), 2);
 306                         assert_eq!(nodes[2].list_channels().len(), 1);
 307                         return;
 308                 } }
 309         }
 310
 311         let mut read_pos = 0;
 312         macro_rules! get_slice {
 313                 ($len: expr) => {
 314                         {
 315                                 let slice_len = $len as usize;
 316                                 if data.len() < read_pos + slice_len {
 317                                         test_return!();
 318                                 }
 319                                 read_pos += slice_len;
 320                                 &data[read_pos - slice_len..read_pos]
 321                         }
 322                 }
 323         }
 324
 325         loop {
 326                 macro_rules! send_payment {
 327                         ($source: expr, $dest: expr) => { {
 328                                 let payment_hash = Sha256::hash(&[payment_id; 1]);
 329                                 payment_id = payment_id.wrapping_add(1);
 330                                 if let Err(_) = $source.send_payment(Route {
 331                                         hops: vec![RouteHop {
 332                                                 pubkey: $dest.0.get_our_node_id(),
 333                                                 short_channel_id: $dest.1,
 334                                                 fee_msat: 5000000,
 335                                                 cltv_expiry_delta: 200,
 336                                         }],
 337                                 }, PaymentHash(payment_hash.into_inner())) {
 338                                         // Probably ran out of funds
 339                                         test_return!();
 340                                 }
 341                         } };
 342                         ($source: expr, $middle: expr, $dest: expr) => { {
 343                                 let payment_hash = Sha256::hash(&[payment_id; 1]);
 344                                 payment_id = payment_id.wrapping_add(1);
 345                                 if let Err(_) = $source.send_payment(Route {
 346                                         hops: vec![RouteHop {
 347                                                 pubkey: $middle.0.get_our_node_id(),
 348                                                 short_channel_id: $middle.1,
 349                                                 fee_msat: 50000,
 350                                                 cltv_expiry_delta: 100,
 351                                         },RouteHop {
 352                                                 pubkey: $dest.0.get_our_node_id(),
 353                                                 short_channel_id: $dest.1,
 354                                                 fee_msat: 5000000,
 355                                                 cltv_expiry_delta: 200,
 356                                         }],
 357                                 }, PaymentHash(payment_hash.into_inner())) {
 358                                         // Probably ran out of funds
 359                                         test_return!();
 360                                 }
 361                         } }
 362                 }
 363
 364                 macro_rules! process_msg_events {
 365                         ($node: expr, $corrupt_forward: expr) => { {
 366                                 for event in nodes[$node].get_and_clear_pending_msg_events() {
 367                                         match event {
 368                                                 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 } } => {
 369                                                         for (idx, dest) in nodes.iter().enumerate() {
 370                                                                 if dest.get_our_node_id() == *node_id &&
 371                                                                                 (($node != 0 && idx != 0) || !chan_a_disconnected) &&
 372                                                                                 (($node != 2 && idx != 2) || !chan_b_disconnected) {
 373                                                                         assert!(update_fee.is_none());
 374                                                                         for update_add in update_add_htlcs {
 375                                                                                 if !$corrupt_forward {
 376                                                                                         test_err!(dest.handle_update_add_htlc(&nodes[$node].get_our_node_id(), &update_add));
 377                                                                                 } else {
 378                                                                                         // Corrupt the update_add_htlc message so that its HMAC
 379                                                                                         // check will fail and we generate a
 380                                                                                         // update_fail_malformed_htlc instead of an
 381                                                                                         // update_fail_htlc as we do when we reject a payment.
 382                                                                                         let mut msg_ser = update_add.encode();
 383                                                                                         msg_ser[1000] ^= 0xff;
 384                                                                                         let new_msg = UpdateAddHTLC::read(&mut Cursor::new(&msg_ser)).unwrap();
 385                                                                                         test_err!(dest.handle_update_add_htlc(&nodes[$node].get_our_node_id(), &new_msg));
 386                                                                                 }
 387                                                                         }
 388                                                                         for update_fulfill in update_fulfill_htlcs {
 389                                                                                 test_err!(dest.handle_update_fulfill_htlc(&nodes[$node].get_our_node_id(), &update_fulfill));
 390                                                                         }
 391                                                                         for update_fail in update_fail_htlcs {
 392                                                                                 test_err!(dest.handle_update_fail_htlc(&nodes[$node].get_our_node_id(), &update_fail));
 393                                                                         }
 394                                                                         for update_fail_malformed in update_fail_malformed_htlcs {
 395                                                                                 test_err!(dest.handle_update_fail_malformed_htlc(&nodes[$node].get_our_node_id(), &update_fail_malformed));
 396                                                                         }
 397                                                                         test_err!(dest.handle_commitment_signed(&nodes[$node].get_our_node_id(), &commitment_signed));
 398                                                                 }
 399                                                         }
 400                                                 },
 401                                                 events::MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
 402                                                         for (idx, dest) in nodes.iter().enumerate() {
 403                                                                 if dest.get_our_node_id() == *node_id &&
 404                                                                                 (($node != 0 && idx != 0) || !chan_a_disconnected) &&
 405                                                                                 (($node != 2 && idx != 2) || !chan_b_disconnected) {
 406                                                                         test_err!(dest.handle_revoke_and_ack(&nodes[$node].get_our_node_id(), msg));
 407                                                                 }
 408                                                         }
 409                                                 },
 410                                                 events::MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
 411                                                         for (idx, dest) in nodes.iter().enumerate() {
 412                                                                 if dest.get_our_node_id() == *node_id {
 413                                                                         test_err!(dest.handle_channel_reestablish(&nodes[$node].get_our_node_id(), msg));
 414                                                                         if $node == 0 || idx == 0 {
 415                                                                                 chan_a_reconnecting = false;
 416                                                                                 chan_a_disconnected = false;
 417                                                                         } else {
 418                                                                                 chan_b_reconnecting = false;
 419                                                                                 chan_b_disconnected = false;
 420                                                                         }
 421                                                                 }
 422                                                         }
 423                                                 },
 424                                                 events::MessageSendEvent::SendFundingLocked { .. } => {
 425                                                         // Can be generated as a reestablish response
 426                                                 },
 427                                                 events::MessageSendEvent::PaymentFailureNetworkUpdate { .. } => {
 428                                                         // Can be generated due to a payment forward being rejected due to a
 429                                                         // channel having previously failed a monitor update
 430                                                 },
 431                                                 _ => panic!("Unhandled message event"),
 432                                         }
 433                                 }
 434                         } }
 435                 }
 436
 437                 macro_rules! process_events {
 438                         ($node: expr, $fail: expr) => { {
 439                                 // In case we get 256 payments we may have a hash collision, resulting in the
 440                                 // second claim/fail call not finding the duplicate-hash HTLC, so we have to
 441                                 // deduplicate the calls here.
 442                                 let mut claim_set = HashSet::new();
 443                                 let mut events = nodes[$node].get_and_clear_pending_events();
 444                                 // Sort events so that PendingHTLCsForwardable get processed last. This avoids a
 445                                 // case where we first process a PendingHTLCsForwardable, then claim/fail on a
 446                                 // PaymentReceived, claiming/failing two HTLCs, but leaving a just-generated
 447                                 // PaymentReceived event for the second HTLC in our pending_events (and breaking
 448                                 // our claim_set deduplication).
 449                                 events.sort_by(|a, b| {
 450                                         if let events::Event::PaymentReceived { .. } = a {
 451                                                 if let events::Event::PendingHTLCsForwardable { .. } = b {
 452                                                         Ordering::Less
 453                                                 } else { Ordering::Equal }
 454                                         } else if let events::Event::PendingHTLCsForwardable { .. } = a {
 455                                                 if let events::Event::PaymentReceived { .. } = b {
 456                                                         Ordering::Greater
 457                                                 } else { Ordering::Equal }
 458                                         } else { Ordering::Equal }
 459                                 });
 460                                 for event in events.drain(..) {
 461                                         match event {
 462                                                 events::Event::PaymentReceived { payment_hash, .. } => {
 463                                                         if claim_set.insert(payment_hash.0) {
 464                                                                 if $fail {
 465                                                                         assert!(nodes[$node].fail_htlc_backwards(&payment_hash));
 466                                                                 } else {
 467                                                                         assert!(nodes[$node].claim_funds(PaymentPreimage(payment_hash.0)));
 468                                                                 }
 469                                                         }
 470                                                 },
 471                                                 events::Event::PaymentSent { .. } => {},
 472                                                 events::Event::PaymentFailed { .. } => {},
 473                                                 events::Event::PendingHTLCsForwardable { .. } => {
 474                                                         nodes[$node].process_pending_htlc_forwards();
 475                                                 },
 476                                                 _ => panic!("Unhandled event"),
 477                                         }
 478                                 }
 479                         } }
 480                 }
 481
 482                 match get_slice!(1)[0] {
 483                         0x00 => *monitor_a.update_ret.lock().unwrap() = Err(ChannelMonitorUpdateErr::TemporaryFailure),
 484                         0x01 => *monitor_b.update_ret.lock().unwrap() = Err(ChannelMonitorUpdateErr::TemporaryFailure),
 485                         0x02 => *monitor_c.update_ret.lock().unwrap() = Err(ChannelMonitorUpdateErr::TemporaryFailure),
 486                         0x03 => *monitor_a.update_ret.lock().unwrap() = Ok(()),
 487                         0x04 => *monitor_b.update_ret.lock().unwrap() = Ok(()),
 488                         0x05 => *monitor_c.update_ret.lock().unwrap() = Ok(()),
 489                         0x06 => nodes[0].test_restore_channel_monitor(),
 490                         0x07 => nodes[1].test_restore_channel_monitor(),
 491                         0x08 => nodes[2].test_restore_channel_monitor(),
 492                         0x09 => send_payment!(nodes[0], (&nodes[1], chan_a)),
 493                         0x0a => send_payment!(nodes[1], (&nodes[0], chan_a)),
 494                         0x0b => send_payment!(nodes[1], (&nodes[2], chan_b)),
 495                         0x0c => send_payment!(nodes[2], (&nodes[1], chan_b)),
 496                         0x0d => send_payment!(nodes[0], (&nodes[1], chan_a), (&nodes[2], chan_b)),
 497                         0x0e => send_payment!(nodes[2], (&nodes[1], chan_b), (&nodes[0], chan_a)),
 498                         0x0f => {
 499                                 if !chan_a_disconnected {
 500                                         nodes[0].peer_disconnected(&nodes[1].get_our_node_id(), false);
 501                                         nodes[1].peer_disconnected(&nodes[0].get_our_node_id(), false);
 502                                         chan_a_disconnected = true;
 503                                 }
 504                         },
 505                         0x10 => {
 506                                 if !chan_b_disconnected {
 507                                         nodes[1].peer_disconnected(&nodes[2].get_our_node_id(), false);
 508                                         nodes[2].peer_disconnected(&nodes[1].get_our_node_id(), false);
 509                                         chan_b_disconnected = true;
 510                                 }
 511                         },
 512                         0x11 => {
 513                                 if chan_a_disconnected && !chan_a_reconnecting {
 514                                         nodes[0].peer_connected(&nodes[1].get_our_node_id());
 515                                         nodes[1].peer_connected(&nodes[0].get_our_node_id());
 516                                         chan_a_reconnecting = true;
 517                                 }
 518                         },
 519                         0x12 => {
 520                                 if chan_b_disconnected && !chan_b_reconnecting {
 521                                         nodes[1].peer_connected(&nodes[2].get_our_node_id());
 522                                         nodes[2].peer_connected(&nodes[1].get_our_node_id());
 523                                         chan_b_reconnecting = true;
 524                                 }
 525                         },
 526                         0x13 => process_msg_events!(0, true),
 527                         0x14 => process_msg_events!(0, false),
 528                         0x15 => process_events!(0, true),
 529                         0x16 => process_events!(0, false),
 530                         0x17 => process_msg_events!(1, true),
 531                         0x18 => process_msg_events!(1, false),
 532                         0x19 => process_events!(1, true),
 533                         0x1a => process_events!(1, false),
 534                         0x1b => process_msg_events!(2, true),
 535                         0x1c => process_msg_events!(2, false),
 536                         0x1d => process_events!(2, true),
 537                         0x1e => process_events!(2, false),
 538                         _ => test_return!(),
 539                 }
 540         }
 541 }
 542
 543 #[cfg(feature = "afl")]
 544 #[macro_use] extern crate afl;
 545 #[cfg(feature = "afl")]
 546 fn main() {
 547         fuzz!(|data| {
 548                 do_test(data);
 549         });
 550 }
 551
 552 #[cfg(feature = "honggfuzz")]
 553 #[macro_use] extern crate honggfuzz;
 554 #[cfg(feature = "honggfuzz")]
 555 fn main() {
 556         loop {
 557                 fuzz!(|data| {
 558                         do_test(data);
 559                 });
 560         }
 561 }
 562
 563 #[cfg(feature = "libfuzzer_fuzz")]
 564 #[macro_use] extern crate libfuzzer_sys;
 565 #[cfg(feature = "libfuzzer_fuzz")]
 566 fuzz_target!(|data: &[u8]| {
 567         do_test(data);
 568 });
 569
 570 extern crate hex;
 571 #[cfg(test)]
 572 mod tests {
 573         #[test]
 574         fn duplicate_crash() {
 575                 super::do_test(&::hex::decode("00").unwrap());
 576         }
 577 }