_ Git - rust-lightning/blob - src/ln/channelmanager.rs

   1 use bitcoin::blockdata::block::BlockHeader;
   2 use bitcoin::blockdata::transaction::Transaction;
   3 use bitcoin::blockdata::constants::genesis_block;
   4 use bitcoin::network::constants::Network;
   5 use bitcoin::network::serialize::BitcoinHash;
   6 use bitcoin::util::hash::Sha256dHash;
   7
   8 use secp256k1::key::{SecretKey,PublicKey};
   9 use secp256k1::{Secp256k1,Message};
  10 use secp256k1::ecdh::SharedSecret;
  11 use secp256k1;
  12
  13 use chain::chaininterface::{BroadcasterInterface,ChainListener,ChainWatchInterface,FeeEstimator};
  14 use chain::transaction::OutPoint;
  15 use ln::channel::{Channel, ChannelKeys};
  16 use ln::channelmonitor::ManyChannelMonitor;
  17 use ln::router::{Route,RouteHop};
  18 use ln::msgs;
  19 use ln::msgs::{HandleError,ChannelMessageHandler,MsgEncodable,MsgDecodable};
  20 use util::{byte_utils, events, internal_traits, rng};
  21 use util::sha2::Sha256;
  22 use util::chacha20poly1305rfc::ChaCha20;
  23 use util::logger::Logger;
  24 use util::errors::APIError;
  25
  26 use crypto;
  27 use crypto::mac::{Mac,MacResult};
  28 use crypto::hmac::Hmac;
  29 use crypto::digest::Digest;
  30 use crypto::symmetriccipher::SynchronousStreamCipher;
  31
  32 use std::{ptr, mem};
  33 use std::collections::HashMap;
  34 use std::collections::hash_map;
  35 use std::sync::{Mutex,MutexGuard,Arc};
  36 use std::sync::atomic::{AtomicUsize, Ordering};
  37 use std::time::{Instant,Duration};
  38
  39 mod channel_held_info {
  40         use ln::msgs;
  41
  42         /// Stores the info we will need to send when we want to forward an HTLC onwards
  43         #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
  44         pub struct PendingForwardHTLCInfo {
  45                 pub(super) onion_packet: Option<msgs::OnionPacket>,
  46                 pub(super) payment_hash: [u8; 32],
  47                 pub(super) short_channel_id: u64,
  48                 pub(super) prev_short_channel_id: u64,
  49                 pub(super) amt_to_forward: u64,
  50                 pub(super) outgoing_cltv_value: u32,
  51         }
  52
  53         #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
  54         pub enum HTLCFailureMsg {
  55                 Relay(msgs::UpdateFailHTLC),
  56                 Malformed(msgs::UpdateFailMalformedHTLC),
  57         }
  58
  59         /// Stores whether we can't forward an HTLC or relevant forwarding info
  60         #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
  61         pub enum PendingHTLCStatus {
  62                 Forward(PendingForwardHTLCInfo),
  63                 Fail(HTLCFailureMsg),
  64         }
  65
  66         #[cfg(feature = "fuzztarget")]
  67         impl PendingHTLCStatus {
  68                 pub fn dummy() -> Self {
  69                         PendingHTLCStatus::Forward(PendingForwardHTLCInfo {
  70                                 onion_packet: None,
  71                                 payment_hash: [0; 32],
  72                                 short_channel_id: 0,
  73                                 prev_short_channel_id: 0,
  74                                 amt_to_forward: 0,
  75                                 outgoing_cltv_value: 0,
  76                         })
  77                 }
  78         }
  79
  80         #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
  81         pub enum HTLCFailReason {
  82                 ErrorPacket {
  83                         err: msgs::OnionErrorPacket,
  84                 },
  85                 Reason {
  86                         failure_code: u16,
  87                         data: Vec<u8>,
  88                 }
  89         }
  90
  91         #[cfg(feature = "fuzztarget")]
  92         impl HTLCFailReason {
  93                 pub fn dummy() -> Self {
  94                         HTLCFailReason::Reason {
  95                                 failure_code: 0, data: Vec::new(),
  96                         }
  97                 }
  98         }
  99 }
 100 #[cfg(feature = "fuzztarget")]
 101 pub use self::channel_held_info::*;
 102 #[cfg(not(feature = "fuzztarget"))]
 103 pub(crate) use self::channel_held_info::*;
 104
 105 enum PendingOutboundHTLC {
 106         IntermediaryHopData {
 107                 source_short_channel_id: u64,
 108                 incoming_packet_shared_secret: SharedSecret,
 109         },
 110         OutboundRoute {
 111                 route: Route,
 112                 session_priv: SecretKey,
 113         },
 114         /// Used for channel rebalancing
 115         CycledRoute {
 116                 source_short_channel_id: u64,
 117                 incoming_packet_shared_secret: SharedSecret,
 118                 route: Route,
 119                 session_priv: SecretKey,
 120         }
 121 }
 122
 123 /// We hold back HTLCs we intend to relay for a random interval in the range (this, 5*this). This
 124 /// provides some limited amount of privacy. Ideally this would range from somewhere like 1 second
 125 /// to 30 seconds, but people expect lightning to be, you know, kinda fast, sadly. We could
 126 /// probably increase this significantly.
 127 const MIN_HTLC_RELAY_HOLDING_CELL_MILLIS: u32 = 50;
 128
 129 struct ChannelHolder {
 130         by_id: HashMap<[u8; 32], Channel>,
 131         short_to_id: HashMap<u64, [u8; 32]>,
 132         next_forward: Instant,
 133         /// short channel id -> forward infos. Key of 0 means payments received
 134         /// Note that while this is held in the same mutex as the channels themselves, no consistency
 135         /// guarantees are made about there existing a channel with the short id here, nor the short
 136         /// ids in the PendingForwardHTLCInfo!
 137         forward_htlcs: HashMap<u64, Vec<PendingForwardHTLCInfo>>,
 138         /// Note that while this is held in the same mutex as the channels themselves, no consistency
 139         /// guarantees are made about the channels given here actually existing anymore by the time you
 140         /// go to read them!
 141         claimable_htlcs: HashMap<[u8; 32], PendingOutboundHTLC>,
 142 }
 143 struct MutChannelHolder<'a> {
 144         by_id: &'a mut HashMap<[u8; 32], Channel>,
 145         short_to_id: &'a mut HashMap<u64, [u8; 32]>,
 146         next_forward: &'a mut Instant,
 147         forward_htlcs: &'a mut HashMap<u64, Vec<PendingForwardHTLCInfo>>,
 148         claimable_htlcs: &'a mut HashMap<[u8; 32], PendingOutboundHTLC>,
 149 }
 150 impl ChannelHolder {
 151         fn borrow_parts(&mut self) -> MutChannelHolder {
 152                 MutChannelHolder {
 153                         by_id: &mut self.by_id,
 154                         short_to_id: &mut self.short_to_id,
 155                         next_forward: &mut self.next_forward,
 156                         forward_htlcs: &mut self.forward_htlcs,
 157                         claimable_htlcs: &mut self.claimable_htlcs,
 158                 }
 159         }
 160 }
 161
 162 #[cfg(not(any(target_pointer_width = "32", target_pointer_width = "64")))]
 163 const ERR: () = "You need at least 32 bit pointers (well, usize, but we'll assume they're the same) for ChannelManager::latest_block_height";
 164
 165 /// Manager which keeps track of a number of channels and sends messages to the appropriate
 166 /// channel, also tracking HTLC preimages and forwarding onion packets appropriately.
 167 /// Implements ChannelMessageHandler, handling the multi-channel parts and passing things through
 168 /// to individual Channels.
 169 pub struct ChannelManager {
 170         genesis_hash: Sha256dHash,
 171         fee_estimator: Arc<FeeEstimator>,
 172         monitor: Arc<ManyChannelMonitor>,
 173         chain_monitor: Arc<ChainWatchInterface>,
 174         tx_broadcaster: Arc<BroadcasterInterface>,
 175
 176         announce_channels_publicly: bool,
 177         fee_proportional_millionths: u32,
 178         latest_block_height: AtomicUsize,
 179         secp_ctx: Secp256k1<secp256k1::All>,
 180
 181         channel_state: Mutex<ChannelHolder>,
 182         our_network_key: SecretKey,
 183
 184         pending_events: Mutex<Vec<events::Event>>,
 185
 186         logger: Arc<Logger>,
 187 }
 188
 189 const CLTV_EXPIRY_DELTA: u16 = 6 * 24 * 2; //TODO?
 190
 191 macro_rules! secp_call {
 192         ( $res : expr ) => {
 193                 match $res {
 194                         Ok(key) => key,
 195                         //TODO: Make the err a parameter!
 196                         Err(_) => return Err(HandleError{err: "Key error", action: None})
 197                 }
 198         };
 199 }
 200
 201 struct OnionKeys {
 202         #[cfg(test)]
 203         shared_secret: SharedSecret,
 204         #[cfg(test)]
 205         blinding_factor: [u8; 32],
 206         ephemeral_pubkey: PublicKey,
 207         rho: [u8; 32],
 208         mu: [u8; 32],
 209 }
 210
 211 pub struct ChannelDetails {
 212         /// The channel's ID (prior to funding transaction generation, this is a random 32 bytes,
 213         /// thereafter this is the txid of the funding transaction xor the funding transaction output).
 214         /// Note that this means this value is *not* persistent - it can change once during the
 215         /// lifetime of the channel.
 216         pub channel_id: [u8; 32],
 217         /// The position of the funding transaction in the chain. None if the funding transaction has
 218         /// not yet been confirmed and the channel fully opened.
 219         pub short_channel_id: Option<u64>,
 220         pub remote_network_id: PublicKey,
 221         pub channel_value_satoshis: u64,
 222         /// The user_id passed in to create_channel, or 0 if the channel was inbound.
 223         pub user_id: u64,
 224 }
 225
 226 impl ChannelManager {
 227         /// Constructs a new ChannelManager to hold several channels and route between them. This is
 228         /// the main "logic hub" for all channel-related actions, and implements ChannelMessageHandler.
 229         /// fee_proportional_millionths is an optional fee to charge any payments routed through us.
 230         /// Non-proportional fees are fixed according to our risk using the provided fee estimator.
 231         /// panics if channel_value_satoshis is >= `MAX_FUNDING_SATOSHIS`!
 232         pub fn new(our_network_key: SecretKey, fee_proportional_millionths: u32, announce_channels_publicly: bool, network: Network, feeest: Arc<FeeEstimator>, monitor: Arc<ManyChannelMonitor>, chain_monitor: Arc<ChainWatchInterface>, tx_broadcaster: Arc<BroadcasterInterface>, logger: Arc<Logger>) -> Result<Arc<ChannelManager>, secp256k1::Error> {
 233                 let secp_ctx = Secp256k1::new();
 234
 235                 let res = Arc::new(ChannelManager {
 236                         genesis_hash: genesis_block(network).header.bitcoin_hash(),
 237                         fee_estimator: feeest.clone(),
 238                         monitor: monitor.clone(),
 239                         chain_monitor,
 240                         tx_broadcaster,
 241
 242                         announce_channels_publicly,
 243                         fee_proportional_millionths,
 244                         latest_block_height: AtomicUsize::new(0), //TODO: Get an init value (generally need to replay recent chain on chain_monitor registration)
 245                         secp_ctx,
 246
 247                         channel_state: Mutex::new(ChannelHolder{
 248                                 by_id: HashMap::new(),
 249                                 short_to_id: HashMap::new(),
 250                                 next_forward: Instant::now(),
 251                                 forward_htlcs: HashMap::new(),
 252                                 claimable_htlcs: HashMap::new(),
 253                         }),
 254                         our_network_key,
 255
 256                         pending_events: Mutex::new(Vec::new()),
 257
 258                         logger,
 259                 });
 260                 let weak_res = Arc::downgrade(&res);
 261                 res.chain_monitor.register_listener(weak_res);
 262                 Ok(res)
 263         }
 264
 265         /// Creates a new outbound channel to the given remote node and with the given value.
 266         /// user_id will be provided back as user_channel_id in FundingGenerationReady and
 267         /// FundingBroadcastSafe events to allow tracking of which events correspond with which
 268         /// create_channel call. Note that user_channel_id defaults to 0 for inbound channels, so you
 269         /// may wish to avoid using 0 for user_id here.
 270         /// If successful, will generate a SendOpenChannel event, so you should probably poll
 271         /// PeerManager::process_events afterwards.
 272         /// Raises APIError::APIMisuseError when channel_value_satoshis > 2**24 or push_msat being greater than channel_value_satoshis * 1k
 273         pub fn create_channel(&self, their_network_key: PublicKey, channel_value_satoshis: u64, push_msat: u64, user_id: u64) -> Result<(), APIError> {
 274                 let chan_keys = if cfg!(feature = "fuzztarget") {
 275                         ChannelKeys {
 276                                 funding_key:               SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
 277                                 revocation_base_key:       SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
 278                                 payment_base_key:          SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
 279                                 delayed_payment_base_key:  SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
 280                                 htlc_base_key:             SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
 281                                 channel_close_key:         SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
 282                                 channel_monitor_claim_key: SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
 283                                 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, 0, 0],
 284                         }
 285                 } else {
 286                         let mut key_seed = [0u8; 32];
 287                         rng::fill_bytes(&mut key_seed);
 288                         match ChannelKeys::new_from_seed(&key_seed) {
 289                                 Ok(key) => key,
 290                                 Err(_) => panic!("RNG is busted!")
 291                         }
 292                 };
 293
 294                 let channel = Channel::new_outbound(&*self.fee_estimator, chan_keys, their_network_key, channel_value_satoshis, push_msat, self.announce_channels_publicly, user_id, Arc::clone(&self.logger))?;
 295                 let res = channel.get_open_channel(self.genesis_hash.clone(), &*self.fee_estimator)?;
 296                 let mut channel_state = self.channel_state.lock().unwrap();
 297                 match channel_state.by_id.insert(channel.channel_id(), channel) {
 298                         Some(_) => panic!("RNG is bad???"),
 299                         None => {}
 300                 }
 301
 302                 let mut events = self.pending_events.lock().unwrap();
 303                 events.push(events::Event::SendOpenChannel {
 304                         node_id: their_network_key,
 305                         msg: res,
 306                 });
 307                 Ok(())
 308         }
 309
 310         /// Gets the list of open channels, in random order. See ChannelDetail field documentation for
 311         /// more information.
 312         pub fn list_channels(&self) -> Vec<ChannelDetails> {
 313                 let channel_state = self.channel_state.lock().unwrap();
 314                 let mut res = Vec::with_capacity(channel_state.by_id.len());
 315                 for (channel_id, channel) in channel_state.by_id.iter() {
 316                         res.push(ChannelDetails {
 317                                 channel_id: (*channel_id).clone(),
 318                                 short_channel_id: channel.get_short_channel_id(),
 319                                 remote_network_id: channel.get_their_node_id(),
 320                                 channel_value_satoshis: channel.get_value_satoshis(),
 321                                 user_id: channel.get_user_id(),
 322                         });
 323                 }
 324                 res
 325         }
 326
 327         /// Gets the list of usable channels, in random order. Useful as an argument to
 328         /// Router::get_route to ensure non-announced channels are used.
 329         pub fn list_usable_channels(&self) -> Vec<ChannelDetails> {
 330                 let channel_state = self.channel_state.lock().unwrap();
 331                 let mut res = Vec::with_capacity(channel_state.by_id.len());
 332                 for (channel_id, channel) in channel_state.by_id.iter() {
 333                         if channel.is_usable() {
 334                                 res.push(ChannelDetails {
 335                                         channel_id: (*channel_id).clone(),
 336                                         short_channel_id: channel.get_short_channel_id(),
 337                                         remote_network_id: channel.get_their_node_id(),
 338                                         channel_value_satoshis: channel.get_value_satoshis(),
 339                                         user_id: channel.get_user_id(),
 340                                 });
 341                         }
 342                 }
 343                 res
 344         }
 345
 346         /// Begins the process of closing a channel. After this call (plus some timeout), no new HTLCs
 347         /// will be accepted on the given channel, and after additional timeout/the closing of all
 348         /// pending HTLCs, the channel will be closed on chain.
 349         /// May generate a SendShutdown event on success, which should be relayed.
 350         pub fn close_channel(&self, channel_id: &[u8; 32]) -> Result<(), HandleError> {
 351                 let (res, node_id, chan_option) = {
 352                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 353                         let channel_state = channel_state_lock.borrow_parts();
 354                         match channel_state.by_id.entry(channel_id.clone()) {
 355                                 hash_map::Entry::Occupied(mut chan_entry) => {
 356                                         let res = chan_entry.get_mut().get_shutdown()?;
 357                                         if chan_entry.get().is_shutdown() {
 358                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
 359                                                         channel_state.short_to_id.remove(&short_id);
 360                                                 }
 361                                                 (res, chan_entry.get().get_their_node_id(), Some(chan_entry.remove_entry().1))
 362                                         } else { (res, chan_entry.get().get_their_node_id(), None) }
 363                                 },
 364                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "No such channel", action: None})
 365                         }
 366                 };
 367                 for payment_hash in res.1 {
 368                         // unknown_next_peer...I dunno who that is anymore....
 369                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
 370                 }
 371                 let chan_update = if let Some(chan) = chan_option {
 372                         if let Ok(update) = self.get_channel_update(&chan) {
 373                                 Some(update)
 374                         } else { None }
 375                 } else { None };
 376
 377                 let mut events = self.pending_events.lock().unwrap();
 378                 if let Some(update) = chan_update {
 379                         events.push(events::Event::BroadcastChannelUpdate {
 380                                 msg: update
 381                         });
 382                 }
 383                 events.push(events::Event::SendShutdown {
 384                         node_id,
 385                         msg: res.0
 386                 });
 387
 388                 Ok(())
 389         }
 390
 391         #[inline]
 392         fn finish_force_close_channel(&self, shutdown_res: (Vec<Transaction>, Vec<[u8; 32]>)) {
 393                 let (local_txn, failed_htlcs) = shutdown_res;
 394                 for payment_hash in failed_htlcs {
 395                         // unknown_next_peer...I dunno who that is anymore....
 396                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
 397                 }
 398                 for tx in local_txn {
 399                         self.tx_broadcaster.broadcast_transaction(&tx);
 400                 }
 401                 //TODO: We need to have a way where outbound HTLC claims can result in us claiming the
 402                 //now-on-chain HTLC output for ourselves (and, thereafter, passing the HTLC backwards).
 403                 //TODO: We need to handle monitoring of pending offered HTLCs which just hit the chain and
 404                 //may be claimed, resulting in us claiming the inbound HTLCs (and back-failing after
 405                 //timeouts are hit and our claims confirm).
 406         }
 407
 408         /// Force closes a channel, immediately broadcasting the latest local commitment transaction to
 409         /// the chain and rejecting new HTLCs on the given channel.
 410         pub fn force_close_channel(&self, channel_id: &[u8; 32]) {
 411                 let mut chan = {
 412                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 413                         let channel_state = channel_state_lock.borrow_parts();
 414                         if let Some(chan) = channel_state.by_id.remove(channel_id) {
 415                                 if let Some(short_id) = chan.get_short_channel_id() {
 416                                         channel_state.short_to_id.remove(&short_id);
 417                                 }
 418                                 chan
 419                         } else {
 420                                 return;
 421                         }
 422                 };
 423                 self.finish_force_close_channel(chan.force_shutdown());
 424                 let mut events = self.pending_events.lock().unwrap();
 425                 if let Ok(update) = self.get_channel_update(&chan) {
 426                         events.push(events::Event::BroadcastChannelUpdate {
 427                                 msg: update
 428                         });
 429                 }
 430         }
 431
 432         /// Force close all channels, immediately broadcasting the latest local commitment transaction
 433         /// for each to the chain and rejecting new HTLCs on each.
 434         pub fn force_close_all_channels(&self) {
 435                 for chan in self.list_channels() {
 436                         self.force_close_channel(&chan.channel_id);
 437                 }
 438         }
 439
 440         #[inline]
 441         fn gen_rho_mu_from_shared_secret(shared_secret: &SharedSecret) -> ([u8; 32], [u8; 32]) {
 442                 ({
 443                         let mut hmac = Hmac::new(Sha256::new(), &[0x72, 0x68, 0x6f]); // rho
 444                         hmac.input(&shared_secret[..]);
 445                         let mut res = [0; 32];
 446                         hmac.raw_result(&mut res);
 447                         res
 448                 },
 449                 {
 450                         let mut hmac = Hmac::new(Sha256::new(), &[0x6d, 0x75]); // mu
 451                         hmac.input(&shared_secret[..]);
 452                         let mut res = [0; 32];
 453                         hmac.raw_result(&mut res);
 454                         res
 455                 })
 456         }
 457
 458         #[inline]
 459         fn gen_um_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 460                 let mut hmac = Hmac::new(Sha256::new(), &[0x75, 0x6d]); // um
 461                 hmac.input(&shared_secret[..]);
 462                 let mut res = [0; 32];
 463                 hmac.raw_result(&mut res);
 464                 res
 465         }
 466
 467         #[inline]
 468         fn gen_ammag_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 469                 let mut hmac = Hmac::new(Sha256::new(), &[0x61, 0x6d, 0x6d, 0x61, 0x67]); // ammag
 470                 hmac.input(&shared_secret[..]);
 471                 let mut res = [0; 32];
 472                 hmac.raw_result(&mut res);
 473                 res
 474         }
 475
 476         // can only fail if an intermediary hop has an invalid public key or session_priv is invalid
 477         #[inline]
 478         fn construct_onion_keys_callback<T: secp256k1::Signing, FType: FnMut(SharedSecret, [u8; 32], PublicKey, &RouteHop)> (secp_ctx: &Secp256k1<T>, route: &Route, session_priv: &SecretKey, mut callback: FType) -> Result<(), HandleError> {
 479                 let mut blinded_priv = session_priv.clone();
 480                 let mut blinded_pub = PublicKey::from_secret_key(secp_ctx, &blinded_priv);
 481
 482                 for hop in route.hops.iter() {
 483                         let shared_secret = SharedSecret::new(secp_ctx, &hop.pubkey, &blinded_priv);
 484
 485                         let mut sha = Sha256::new();
 486                         sha.input(&blinded_pub.serialize()[..]);
 487                         sha.input(&shared_secret[..]);
 488                         let mut blinding_factor = [0u8; 32];
 489                         sha.result(&mut blinding_factor);
 490
 491                         let ephemeral_pubkey = blinded_pub;
 492
 493                         secp_call!(blinded_priv.mul_assign(secp_ctx, &secp_call!(SecretKey::from_slice(secp_ctx, &blinding_factor))));
 494                         blinded_pub = PublicKey::from_secret_key(secp_ctx, &blinded_priv);
 495
 496                         callback(shared_secret, blinding_factor, ephemeral_pubkey, hop);
 497                 }
 498
 499                 Ok(())
 500         }
 501
 502         // can only fail if an intermediary hop has an invalid public key or session_priv is invalid
 503         fn construct_onion_keys<T: secp256k1::Signing>(secp_ctx: &Secp256k1<T>, route: &Route, session_priv: &SecretKey) -> Result<Vec<OnionKeys>, HandleError> {
 504                 let mut res = Vec::with_capacity(route.hops.len());
 505
 506                 Self::construct_onion_keys_callback(secp_ctx, route, session_priv, |shared_secret, _blinding_factor, ephemeral_pubkey, _| {
 507                         let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
 508
 509                         res.push(OnionKeys {
 510                                 #[cfg(test)]
 511                                 shared_secret,
 512                                 #[cfg(test)]
 513                                 blinding_factor: _blinding_factor,
 514                                 ephemeral_pubkey,
 515                                 rho,
 516                                 mu,
 517                         });
 518                 })?;
 519
 520                 Ok(res)
 521         }
 522
 523         /// returns the hop data, as well as the first-hop value_msat and CLTV value we should send.
 524         fn build_onion_payloads(route: &Route, starting_htlc_offset: u32) -> Result<(Vec<msgs::OnionHopData>, u64, u32), HandleError> {
 525                 let mut cur_value_msat = 0u64;
 526                 let mut cur_cltv = starting_htlc_offset;
 527                 let mut last_short_channel_id = 0;
 528                 let mut res: Vec<msgs::OnionHopData> = Vec::with_capacity(route.hops.len());
 529                 internal_traits::test_no_dealloc::<msgs::OnionHopData>(None);
 530                 unsafe { res.set_len(route.hops.len()); }
 531
 532                 for (idx, hop) in route.hops.iter().enumerate().rev() {
 533                         // First hop gets special values so that it can check, on receipt, that everything is
 534                         // exactly as it should be (and the next hop isn't trying to probe to find out if we're
 535                         // the intended recipient).
 536                         let value_msat = if cur_value_msat == 0 { hop.fee_msat } else { cur_value_msat };
 537                         let cltv = if cur_cltv == starting_htlc_offset { hop.cltv_expiry_delta + starting_htlc_offset } else { cur_cltv };
 538                         res[idx] = msgs::OnionHopData {
 539                                 realm: 0,
 540                                 data: msgs::OnionRealm0HopData {
 541                                         short_channel_id: last_short_channel_id,
 542                                         amt_to_forward: value_msat,
 543                                         outgoing_cltv_value: cltv,
 544                                 },
 545                                 hmac: [0; 32],
 546                         };
 547                         cur_value_msat += hop.fee_msat;
 548                         if cur_value_msat >= 21000000 * 100000000 * 1000 {
 549                                 return Err(HandleError{err: "Channel fees overflowed?!", action: None});
 550                         }
 551                         cur_cltv += hop.cltv_expiry_delta as u32;
 552                         if cur_cltv >= 500000000 {
 553                                 return Err(HandleError{err: "Channel CLTV overflowed?!", action: None});
 554                         }
 555                         last_short_channel_id = hop.short_channel_id;
 556                 }
 557                 Ok((res, cur_value_msat, cur_cltv))
 558         }
 559
 560         #[inline]
 561         fn shift_arr_right(arr: &mut [u8; 20*65]) {
 562                 unsafe {
 563                         ptr::copy(arr[0..].as_ptr(), arr[65..].as_mut_ptr(), 19*65);
 564                 }
 565                 for i in 0..65 {
 566                         arr[i] = 0;
 567                 }
 568         }
 569
 570         #[inline]
 571         fn xor_bufs(dst: &mut[u8], src: &[u8]) {
 572                 assert_eq!(dst.len(), src.len());
 573
 574                 for i in 0..dst.len() {
 575                         dst[i] ^= src[i];
 576                 }
 577         }
 578
 579         const ZERO:[u8; 21*65] = [0; 21*65];
 580         fn construct_onion_packet(mut payloads: Vec<msgs::OnionHopData>, onion_keys: Vec<OnionKeys>, associated_data: &[u8; 32]) -> Result<msgs::OnionPacket, HandleError> {
 581                 let mut buf = Vec::with_capacity(21*65);
 582                 buf.resize(21*65, 0);
 583
 584                 let filler = {
 585                         let iters = payloads.len() - 1;
 586                         let end_len = iters * 65;
 587                         let mut res = Vec::with_capacity(end_len);
 588                         res.resize(end_len, 0);
 589
 590                         for (i, keys) in onion_keys.iter().enumerate() {
 591                                 if i == payloads.len() - 1 { continue; }
 592                                 let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 593                                 chacha.process(&ChannelManager::ZERO, &mut buf); // We don't have a seek function :(
 594                                 ChannelManager::xor_bufs(&mut res[0..(i + 1)*65], &buf[(20 - i)*65..21*65]);
 595                         }
 596                         res
 597                 };
 598
 599                 let mut packet_data = [0; 20*65];
 600                 let mut hmac_res = [0; 32];
 601
 602                 for (i, (payload, keys)) in payloads.iter_mut().zip(onion_keys.iter()).rev().enumerate() {
 603                         ChannelManager::shift_arr_right(&mut packet_data);
 604                         payload.hmac = hmac_res;
 605                         packet_data[0..65].copy_from_slice(&payload.encode()[..]);
 606
 607                         let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 608                         chacha.process(&packet_data, &mut buf[0..20*65]);
 609                         packet_data[..].copy_from_slice(&buf[0..20*65]);
 610
 611                         if i == 0 {
 612                                 packet_data[20*65 - filler.len()..20*65].copy_from_slice(&filler[..]);
 613                         }
 614
 615                         let mut hmac = Hmac::new(Sha256::new(), &keys.mu);
 616                         hmac.input(&packet_data);
 617                         hmac.input(&associated_data[..]);
 618                         hmac.raw_result(&mut hmac_res);
 619                 }
 620
 621                 Ok(msgs::OnionPacket{
 622                         version: 0,
 623                         public_key: Ok(onion_keys.first().unwrap().ephemeral_pubkey),
 624                         hop_data: packet_data,
 625                         hmac: hmac_res,
 626                 })
 627         }
 628
 629         /// Encrypts a failure packet. raw_packet can either be a
 630         /// msgs::DecodedOnionErrorPacket.encode() result or a msgs::OnionErrorPacket.data element.
 631         fn encrypt_failure_packet(shared_secret: &SharedSecret, raw_packet: &[u8]) -> msgs::OnionErrorPacket {
 632                 let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
 633
 634                 let mut packet_crypted = Vec::with_capacity(raw_packet.len());
 635                 packet_crypted.resize(raw_packet.len(), 0);
 636                 let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
 637                 chacha.process(&raw_packet, &mut packet_crypted[..]);
 638                 msgs::OnionErrorPacket {
 639                         data: packet_crypted,
 640                 }
 641         }
 642
 643         fn build_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::DecodedOnionErrorPacket {
 644                 assert!(failure_data.len() <= 256 - 2);
 645
 646                 let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
 647
 648                 let failuremsg = {
 649                         let mut res = Vec::with_capacity(2 + failure_data.len());
 650                         res.push(((failure_type >> 8) & 0xff) as u8);
 651                         res.push(((failure_type >> 0) & 0xff) as u8);
 652                         res.extend_from_slice(&failure_data[..]);
 653                         res
 654                 };
 655                 let pad = {
 656                         let mut res = Vec::with_capacity(256 - 2 - failure_data.len());
 657                         res.resize(256 - 2 - failure_data.len(), 0);
 658                         res
 659                 };
 660                 let mut packet = msgs::DecodedOnionErrorPacket {
 661                         hmac: [0; 32],
 662                         failuremsg: failuremsg,
 663                         pad: pad,
 664                 };
 665
 666                 let mut hmac = Hmac::new(Sha256::new(), &um);
 667                 hmac.input(&packet.encode()[32..]);
 668                 hmac.raw_result(&mut packet.hmac);
 669
 670                 packet
 671         }
 672
 673         #[inline]
 674         fn build_first_hop_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::OnionErrorPacket {
 675                 let failure_packet = ChannelManager::build_failure_packet(shared_secret, failure_type, failure_data);
 676                 ChannelManager::encrypt_failure_packet(shared_secret, &failure_packet.encode()[..])
 677         }
 678
 679         fn decode_update_add_htlc_onion(&self, msg: &msgs::UpdateAddHTLC) -> (PendingHTLCStatus, Option<SharedSecret>, MutexGuard<ChannelHolder>) {
 680                 macro_rules! get_onion_hash {
 681                         () => {
 682                                 {
 683                                         let mut sha = Sha256::new();
 684                                         sha.input(&msg.onion_routing_packet.hop_data);
 685                                         let mut onion_hash = [0; 32];
 686                                         sha.result(&mut onion_hash);
 687                                         onion_hash
 688                                 }
 689                         }
 690                 }
 691
 692                 if let Err(_) = msg.onion_routing_packet.public_key {
 693                         log_info!(self, "Failed to accept/forward incoming HTLC with invalid ephemeral pubkey");
 694                         return (PendingHTLCStatus::Fail(HTLCFailureMsg::Malformed(msgs::UpdateFailMalformedHTLC {
 695                                 channel_id: msg.channel_id,
 696                                 htlc_id: msg.htlc_id,
 697                                 sha256_of_onion: get_onion_hash!(),
 698                                 failure_code: 0x8000 | 0x4000 | 6,
 699                         })), None, self.channel_state.lock().unwrap());
 700                 }
 701
 702                 let shared_secret = SharedSecret::new(&self.secp_ctx, &msg.onion_routing_packet.public_key.unwrap(), &self.our_network_key);
 703                 let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
 704
 705                 let mut channel_state = None;
 706                 macro_rules! return_err {
 707                         ($msg: expr, $err_code: expr, $data: expr) => {
 708                                 {
 709                                         log_info!(self, "Failed to accept/forward incoming HTLC: {}", $msg);
 710                                         if channel_state.is_none() {
 711                                                 channel_state = Some(self.channel_state.lock().unwrap());
 712                                         }
 713                                         return (PendingHTLCStatus::Fail(HTLCFailureMsg::Relay(msgs::UpdateFailHTLC {
 714                                                 channel_id: msg.channel_id,
 715                                                 htlc_id: msg.htlc_id,
 716                                                 reason: ChannelManager::build_first_hop_failure_packet(&shared_secret, $err_code, $data),
 717                                         })), Some(shared_secret), channel_state.unwrap());
 718                                 }
 719                         }
 720                 }
 721
 722                 if msg.onion_routing_packet.version != 0 {
 723                         //TODO: Spec doesn't indicate if we should only hash hop_data here (and in other
 724                         //sha256_of_onion error data packets), or the entire onion_routing_packet. Either way,
 725                         //the hash doesn't really serve any purpuse - in the case of hashing all data, the
 726                         //receiving node would have to brute force to figure out which version was put in the
 727                         //packet by the node that send us the message, in the case of hashing the hop_data, the
 728                         //node knows the HMAC matched, so they already know what is there...
 729                         return_err!("Unknown onion packet version", 0x8000 | 0x4000 | 4, &get_onion_hash!());
 730                 }
 731
 732                 let mut hmac = Hmac::new(Sha256::new(), &mu);
 733                 hmac.input(&msg.onion_routing_packet.hop_data);
 734                 hmac.input(&msg.payment_hash);
 735                 if hmac.result() != MacResult::new(&msg.onion_routing_packet.hmac) {
 736                         return_err!("HMAC Check failed", 0x8000 | 0x4000 | 5, &get_onion_hash!());
 737                 }
 738
 739                 let mut chacha = ChaCha20::new(&rho, &[0u8; 8]);
 740                 let next_hop_data = {
 741                         let mut decoded = [0; 65];
 742                         chacha.process(&msg.onion_routing_packet.hop_data[0..65], &mut decoded);
 743                         match msgs::OnionHopData::decode(&decoded[..]) {
 744                                 Err(err) => {
 745                                         let error_code = match err {
 746                                                 msgs::DecodeError::UnknownRealmByte => 0x4000 | 1,
 747                                                 _ => 0x2000 | 2, // Should never happen
 748                                         };
 749                                         return_err!("Unable to decode our hop data", error_code, &[0;0]);
 750                                 },
 751                                 Ok(msg) => msg
 752                         }
 753                 };
 754
 755                 //TODO: Check that msg.cltv_expiry is within acceptable bounds!
 756
 757                 let pending_forward_info = if next_hop_data.hmac == [0; 32] {
 758                                 // OUR PAYMENT!
 759                                 if next_hop_data.data.amt_to_forward != msg.amount_msat {
 760                                         return_err!("Upstream node sent less than we were supposed to receive in payment", 19, &byte_utils::be64_to_array(msg.amount_msat));
 761                                 }
 762                                 if next_hop_data.data.outgoing_cltv_value != msg.cltv_expiry {
 763                                         return_err!("Upstream node set CLTV to the wrong value", 18, &byte_utils::be32_to_array(msg.cltv_expiry));
 764                                 }
 765
 766                                 // Note that we could obviously respond immediately with an update_fulfill_htlc
 767                                 // message, however that would leak that we are the recipient of this payment, so
 768                                 // instead we stay symmetric with the forwarding case, only responding (after a
 769                                 // delay) once they've send us a commitment_signed!
 770
 771                                 PendingHTLCStatus::Forward(PendingForwardHTLCInfo {
 772                                         onion_packet: None,
 773                                         payment_hash: msg.payment_hash.clone(),
 774                                         short_channel_id: 0,
 775                                         prev_short_channel_id: 0,
 776                                         amt_to_forward: next_hop_data.data.amt_to_forward,
 777                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
 778                                 })
 779                         } else {
 780                                 let mut new_packet_data = [0; 20*65];
 781                                 chacha.process(&msg.onion_routing_packet.hop_data[65..], &mut new_packet_data[0..19*65]);
 782                                 chacha.process(&ChannelManager::ZERO[0..65], &mut new_packet_data[19*65..]);
 783
 784                                 let mut new_pubkey = msg.onion_routing_packet.public_key.unwrap();
 785
 786                                 let blinding_factor = {
 787                                         let mut sha = Sha256::new();
 788                                         sha.input(&new_pubkey.serialize()[..]);
 789                                         sha.input(&shared_secret[..]);
 790                                         let mut res = [0u8; 32];
 791                                         sha.result(&mut res);
 792                                         match SecretKey::from_slice(&self.secp_ctx, &res) {
 793                                                 Err(_) => {
 794                                                         return_err!("Blinding factor is an invalid private key", 0x8000 | 0x4000 | 6, &get_onion_hash!());
 795                                                 },
 796                                                 Ok(key) => key
 797                                         }
 798                                 };
 799
 800                                 if let Err(_) = new_pubkey.mul_assign(&self.secp_ctx, &blinding_factor) {
 801                                         return_err!("New blinding factor is an invalid private key", 0x8000 | 0x4000 | 6, &get_onion_hash!());
 802                                 }
 803
 804                                 let outgoing_packet = msgs::OnionPacket {
 805                                         version: 0,
 806                                         public_key: Ok(new_pubkey),
 807                                         hop_data: new_packet_data,
 808                                         hmac: next_hop_data.hmac.clone(),
 809                                 };
 810
 811                                 PendingHTLCStatus::Forward(PendingForwardHTLCInfo {
 812                                         onion_packet: Some(outgoing_packet),
 813                                         payment_hash: msg.payment_hash.clone(),
 814                                         short_channel_id: next_hop_data.data.short_channel_id,
 815                                         prev_short_channel_id: 0,
 816                                         amt_to_forward: next_hop_data.data.amt_to_forward,
 817                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
 818                                 })
 819                         };
 820
 821                 channel_state = Some(self.channel_state.lock().unwrap());
 822                 if let &PendingHTLCStatus::Forward(PendingForwardHTLCInfo { ref onion_packet, ref short_channel_id, ref amt_to_forward, ref outgoing_cltv_value, .. }) = &pending_forward_info {
 823                         if onion_packet.is_some() { // If short_channel_id is 0 here, we'll reject them in the body here
 824                                 let id_option = channel_state.as_ref().unwrap().short_to_id.get(&short_channel_id).cloned();
 825                                 let forwarding_id = match id_option {
 826                                         None => {
 827                                                 return_err!("Don't have available channel for forwarding as requested.", 0x4000 | 10, &[0;0]);
 828                                         },
 829                                         Some(id) => id.clone(),
 830                                 };
 831                                 if let Some((err, code, chan_update)) = {
 832                                         let chan = channel_state.as_mut().unwrap().by_id.get_mut(&forwarding_id).unwrap();
 833                                         if !chan.is_live() {
 834                                                 Some(("Forwarding channel is not in a ready state.", 0x1000 | 7, self.get_channel_update(chan).unwrap()))
 835                                         } else {
 836                                                 let fee = amt_to_forward.checked_mul(self.fee_proportional_millionths as u64).and_then(|prop_fee| { (prop_fee / 1000000).checked_add(chan.get_our_fee_base_msat(&*self.fee_estimator) as u64) });
 837                                                 if fee.is_none() || msg.amount_msat < fee.unwrap() || (msg.amount_msat - fee.unwrap()) < *amt_to_forward {
 838                                                         Some(("Prior hop has deviated from specified fees parameters or origin node has obsolete ones", 0x1000 | 12, self.get_channel_update(chan).unwrap()))
 839                                                 } else {
 840                                                         if (msg.cltv_expiry as u64) < (*outgoing_cltv_value) as u64 + CLTV_EXPIRY_DELTA as u64 {
 841                                                                 Some(("Forwarding node has tampered with the intended HTLC values or origin node has an obsolete cltv_expiry_delta", 0x1000 | 13, self.get_channel_update(chan).unwrap()))
 842                                                         } else {
 843                                                                 None
 844                                                         }
 845                                                 }
 846                                         }
 847                                 } {
 848                                         return_err!(err, code, &chan_update.encode_with_len()[..]);
 849                                 }
 850                         }
 851                 }
 852
 853                 (pending_forward_info, Some(shared_secret), channel_state.unwrap())
 854         }
 855
 856         /// only fails if the channel does not yet have an assigned short_id
 857         fn get_channel_update(&self, chan: &Channel) -> Result<msgs::ChannelUpdate, HandleError> {
 858                 let short_channel_id = match chan.get_short_channel_id() {
 859                         None => return Err(HandleError{err: "Channel not yet established", action: None}),
 860                         Some(id) => id,
 861                 };
 862
 863                 let were_node_one = PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).serialize()[..] < chan.get_their_node_id().serialize()[..];
 864
 865                 let unsigned = msgs::UnsignedChannelUpdate {
 866                         chain_hash: self.genesis_hash,
 867                         short_channel_id: short_channel_id,
 868                         timestamp: chan.get_channel_update_count(),
 869                         flags: (!were_node_one) as u16 | ((!chan.is_live() as u16) << 1),
 870                         cltv_expiry_delta: CLTV_EXPIRY_DELTA,
 871                         htlc_minimum_msat: chan.get_our_htlc_minimum_msat(),
 872                         fee_base_msat: chan.get_our_fee_base_msat(&*self.fee_estimator),
 873                         fee_proportional_millionths: self.fee_proportional_millionths,
 874                         excess_data: Vec::new(),
 875                 };
 876
 877                 let msg_hash = Sha256dHash::from_data(&unsigned.encode()[..]);
 878                 let sig = self.secp_ctx.sign(&Message::from_slice(&msg_hash[..]).unwrap(), &self.our_network_key); //TODO Can we unwrap here?
 879
 880                 Ok(msgs::ChannelUpdate {
 881                         signature: sig,
 882                         contents: unsigned
 883                 })
 884         }
 885
 886         /// Sends a payment along a given route.
 887         /// Value parameters are provided via the last hop in route, see documentation for RouteHop
 888         /// fields for more info.
 889         /// Note that if the payment_hash already exists elsewhere (eg you're sending a duplicative
 890         /// payment), we don't do anything to stop you! We always try to ensure that if the provided
 891         /// next hop knows the preimage to payment_hash they can claim an additional amount as
 892         /// specified in the last hop in the route! Thus, you should probably do your own
 893         /// payment_preimage tracking (which you should already be doing as they represent "proof of
 894         /// payment") and prevent double-sends yourself.
 895         /// See-also docs on Channel::send_htlc_and_commit.
 896         /// May generate a SendHTLCs event on success, which should be relayed.
 897         pub fn send_payment(&self, route: Route, payment_hash: [u8; 32]) -> Result<(), HandleError> {
 898                 if route.hops.len() < 1 || route.hops.len() > 20 {
 899                         return Err(HandleError{err: "Route didn't go anywhere/had bogus size", action: None});
 900                 }
 901                 let our_node_id = self.get_our_node_id();
 902                 for (idx, hop) in route.hops.iter().enumerate() {
 903                         if idx != route.hops.len() - 1 && hop.pubkey == our_node_id {
 904                                 return Err(HandleError{err: "Route went through us but wasn't a simple rebalance loop to us", action: None});
 905                         }
 906                 }
 907
 908                 let session_priv = secp_call!(SecretKey::from_slice(&self.secp_ctx, &{
 909                         let mut session_key = [0; 32];
 910                         rng::fill_bytes(&mut session_key);
 911                         session_key
 912                 }));
 913
 914                 let cur_height = self.latest_block_height.load(Ordering::Acquire) as u32 + 1;
 915
 916                 let onion_keys = ChannelManager::construct_onion_keys(&self.secp_ctx, &route, &session_priv)?;
 917                 let (onion_payloads, htlc_msat, htlc_cltv) = ChannelManager::build_onion_payloads(&route, cur_height)?;
 918                 let onion_packet = ChannelManager::construct_onion_packet(onion_payloads, onion_keys, &payment_hash)?;
 919
 920                 let (first_hop_node_id, (update_add, commitment_signed, chan_monitor)) = {
 921                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 922                         let channel_state = channel_state_lock.borrow_parts();
 923
 924                         let id = match channel_state.short_to_id.get(&route.hops.first().unwrap().short_channel_id) {
 925                                 None => return Err(HandleError{err: "No channel available with first hop!", action: None}),
 926                                 Some(id) => id.clone()
 927                         };
 928
 929                         let claimable_htlc_entry = channel_state.claimable_htlcs.entry(payment_hash.clone());
 930                         if let hash_map::Entry::Occupied(_) = claimable_htlc_entry {
 931                                 return Err(HandleError{err: "Already had pending HTLC with the same payment_hash", action: None});
 932                         }
 933
 934                         let res = {
 935                                 let chan = channel_state.by_id.get_mut(&id).unwrap();
 936                                 if chan.get_their_node_id() != route.hops.first().unwrap().pubkey {
 937                                         return Err(HandleError{err: "Node ID mismatch on first hop!", action: None});
 938                                 }
 939                                 chan.send_htlc_and_commit(htlc_msat, payment_hash, htlc_cltv, onion_packet)?
 940                         };
 941
 942                         let first_hop_node_id = route.hops.first().unwrap().pubkey;
 943
 944                         claimable_htlc_entry.or_insert(PendingOutboundHTLC::OutboundRoute {
 945                                 route,
 946                                 session_priv,
 947                         });
 948
 949                         match res {
 950                                 Some(msgs) => (first_hop_node_id, msgs),
 951                                 None => return Ok(()),
 952                         }
 953                 };
 954
 955                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 956                         unimplemented!(); // maybe remove from claimable_htlcs?
 957                 }
 958
 959                 let mut events = self.pending_events.lock().unwrap();
 960                 events.push(events::Event::UpdateHTLCs {
 961                         node_id: first_hop_node_id,
 962                         updates: msgs::CommitmentUpdate {
 963                                 update_add_htlcs: vec![update_add],
 964                                 update_fulfill_htlcs: Vec::new(),
 965                                 update_fail_htlcs: Vec::new(),
 966                                 update_fail_malformed_htlcs: Vec::new(),
 967                                 commitment_signed,
 968                         },
 969                 });
 970                 Ok(())
 971         }
 972
 973         /// Call this upon creation of a funding transaction for the given channel.
 974         /// Panics if a funding transaction has already been provided for this channel.
 975         /// May panic if the funding_txo is duplicative with some other channel (note that this should
 976         /// be trivially prevented by using unique funding transaction keys per-channel).
 977         pub fn funding_transaction_generated(&self, temporary_channel_id: &[u8; 32], funding_txo: OutPoint) {
 978
 979                 macro_rules! add_pending_event {
 980                         ($event: expr) => {
 981                                 {
 982                                         let mut pending_events = self.pending_events.lock().unwrap();
 983                                         pending_events.push($event);
 984                                 }
 985                         }
 986                 }
 987
 988                 let (chan, msg, chan_monitor) = {
 989                         let mut channel_state = self.channel_state.lock().unwrap();
 990                         match channel_state.by_id.remove(temporary_channel_id) {
 991                                 Some(mut chan) => {
 992                                         match chan.get_outbound_funding_created(funding_txo) {
 993                                                 Ok(funding_msg) => {
 994                                                         (chan, funding_msg.0, funding_msg.1)
 995                                                 },
 996                                                 Err(e) => {
 997                                                         log_error!(self, "Got bad signatures: {}!", e.err);
 998                                                         mem::drop(channel_state);
 999                                                         add_pending_event!(events::Event::HandleError {
1000                                                                 node_id: chan.get_their_node_id(),
1001                                                                 action: e.action,
1002                                                         });
1003                                                         return;
1004                                                 },
1005                                         }
1006                                 },
1007                                 None => return
1008                         }
1009                 }; // Release channel lock for install_watch_outpoint call,
1010                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1011                         unimplemented!(); // maybe remove from claimable_htlcs?
1012                 }
1013                 add_pending_event!(events::Event::SendFundingCreated {
1014                         node_id: chan.get_their_node_id(),
1015                         msg: msg,
1016                 });
1017
1018                 let mut channel_state = self.channel_state.lock().unwrap();
1019                 match channel_state.by_id.entry(chan.channel_id()) {
1020                         hash_map::Entry::Occupied(_) => {
1021                                 panic!("Generated duplicate funding txid?");
1022                         },
1023                         hash_map::Entry::Vacant(e) => {
1024                                 e.insert(chan);
1025                         }
1026                 }
1027         }
1028
1029         fn get_announcement_sigs(&self, chan: &Channel) -> Option<msgs::AnnouncementSignatures> {
1030                 if !chan.should_announce() { return None }
1031
1032                 let (announcement, our_bitcoin_sig) = match chan.get_channel_announcement(self.get_our_node_id(), self.genesis_hash.clone()) {
1033                         Ok(res) => res,
1034                         Err(_) => return None, // Only in case of state precondition violations eg channel is closing
1035                 };
1036                 let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
1037                 let our_node_sig = self.secp_ctx.sign(&msghash, &self.our_network_key);
1038
1039                 Some(msgs::AnnouncementSignatures {
1040                         channel_id: chan.channel_id(),
1041                         short_channel_id: chan.get_short_channel_id().unwrap(),
1042                         node_signature: our_node_sig,
1043                         bitcoin_signature: our_bitcoin_sig,
1044                 })
1045         }
1046
1047         /// Processes HTLCs which are pending waiting on random forward delay.
1048         /// Should only really ever be called in response to an PendingHTLCsForwardable event.
1049         /// Will likely generate further events.
1050         pub fn process_pending_htlc_forwards(&self) {
1051                 let mut new_events = Vec::new();
1052                 let mut failed_forwards = Vec::new();
1053                 {
1054                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1055                         let channel_state = channel_state_lock.borrow_parts();
1056
1057                         if cfg!(not(feature = "fuzztarget")) && Instant::now() < *channel_state.next_forward {
1058                                 return;
1059                         }
1060
1061                         for (short_chan_id, pending_forwards) in channel_state.forward_htlcs.drain() {
1062                                 if short_chan_id != 0 {
1063                                         let forward_chan_id = match channel_state.short_to_id.get(&short_chan_id) {
1064                                                 Some(chan_id) => chan_id.clone(),
1065                                                 None => {
1066                                                         failed_forwards.reserve(pending_forwards.len());
1067                                                         for forward_info in pending_forwards {
1068                                                                 failed_forwards.push((forward_info.payment_hash, 0x4000 | 10, None));
1069                                                         }
1070                                                         continue;
1071                                                 }
1072                                         };
1073                                         let forward_chan = &mut channel_state.by_id.get_mut(&forward_chan_id).unwrap();
1074
1075                                         let mut add_htlc_msgs = Vec::new();
1076                                         for forward_info in pending_forwards {
1077                                                 match forward_chan.send_htlc(forward_info.amt_to_forward, forward_info.payment_hash, forward_info.outgoing_cltv_value, forward_info.onion_packet.unwrap()) {
1078                                                         Err(_e) => {
1079                                                                 let chan_update = self.get_channel_update(forward_chan).unwrap();
1080                                                                 failed_forwards.push((forward_info.payment_hash, 0x1000 | 7, Some(chan_update)));
1081                                                                 continue;
1082                                                         },
1083                                                         Ok(update_add) => {
1084                                                                 match update_add {
1085                                                                         Some(msg) => { add_htlc_msgs.push(msg); },
1086                                                                         None => {
1087                                                                                 // Nothing to do here...we're waiting on a remote
1088                                                                                 // revoke_and_ack before we can add anymore HTLCs. The Channel
1089                                                                                 // will automatically handle building the update_add_htlc and
1090                                                                                 // commitment_signed messages when we can.
1091                                                                                 // TODO: Do some kind of timer to set the channel as !is_live()
1092                                                                                 // as we don't really want others relying on us relaying through
1093                                                                                 // this channel currently :/.
1094                                                                         }
1095                                                                 }
1096                                                         }
1097                                                 }
1098                                         }
1099
1100                                         if !add_htlc_msgs.is_empty() {
1101                                                 let (commitment_msg, monitor) = match forward_chan.send_commitment() {
1102                                                         Ok(res) => res,
1103                                                         Err(_e) => {
1104                                                                 //TODO: Handle...this is bad!
1105                                                                 continue;
1106                                                         },
1107                                                 };
1108                                                 new_events.push((Some(monitor), events::Event::UpdateHTLCs {
1109                                                         node_id: forward_chan.get_their_node_id(),
1110                                                         updates: msgs::CommitmentUpdate {
1111                                                                 update_add_htlcs: add_htlc_msgs,
1112                                                                 update_fulfill_htlcs: Vec::new(),
1113                                                                 update_fail_htlcs: Vec::new(),
1114                                                                 update_fail_malformed_htlcs: Vec::new(),
1115                                                                 commitment_signed: commitment_msg,
1116                                                         },
1117                                                 }));
1118                                         }
1119                                 } else {
1120                                         for forward_info in pending_forwards {
1121                                                 new_events.push((None, events::Event::PaymentReceived {
1122                                                         payment_hash: forward_info.payment_hash,
1123                                                         amt: forward_info.amt_to_forward,
1124                                                 }));
1125                                         }
1126                                 }
1127                         }
1128                 }
1129
1130                 for failed_forward in failed_forwards.drain(..) {
1131                         match failed_forward.2 {
1132                                 None => self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &failed_forward.0, HTLCFailReason::Reason { failure_code: failed_forward.1, data: Vec::new() }),
1133                                 Some(chan_update) => self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &failed_forward.0, HTLCFailReason::Reason { failure_code: failed_forward.1, data: chan_update.encode_with_len() }),
1134                         };
1135                 }
1136
1137                 if new_events.is_empty() { return }
1138
1139                 new_events.retain(|event| {
1140                         if let &Some(ref monitor) = &event.0 {
1141                                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor.clone()) {
1142                                         unimplemented!();// but def dont push the event...
1143                                 }
1144                         }
1145                         true
1146                 });
1147
1148                 let mut events = self.pending_events.lock().unwrap();
1149                 events.reserve(new_events.len());
1150                 for event in new_events.drain(..) {
1151                         events.push(event.1);
1152                 }
1153         }
1154
1155         /// Indicates that the preimage for payment_hash is unknown after a PaymentReceived event.
1156         pub fn fail_htlc_backwards(&self, payment_hash: &[u8; 32]) -> bool {
1157                 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 15, data: Vec::new() })
1158         }
1159
1160         /// Fails an HTLC backwards to the sender of it to us.
1161         /// Note that while we take a channel_state lock as input, we do *not* assume consistency here.
1162         /// There are several callsites that do stupid things like loop over a list of payment_hashes
1163         /// to fail and take the channel_state lock for each iteration (as we take ownership and may
1164         /// drop it). In other words, no assumptions are made that entries in claimable_htlcs point to
1165         /// still-available channels.
1166         fn fail_htlc_backwards_internal(&self, mut channel_state: MutexGuard<ChannelHolder>, payment_hash: &[u8; 32], onion_error: HTLCFailReason) -> bool {
1167                 let mut pending_htlc = {
1168                         match channel_state.claimable_htlcs.remove(payment_hash) {
1169                                 Some(pending_htlc) => pending_htlc,
1170                                 None => return false,
1171                         }
1172                 };
1173
1174                 match pending_htlc {
1175                         PendingOutboundHTLC::CycledRoute { source_short_channel_id, incoming_packet_shared_secret, route, session_priv } => {
1176                                 channel_state.claimable_htlcs.insert(payment_hash.clone(), PendingOutboundHTLC::OutboundRoute {
1177                                         route,
1178                                         session_priv,
1179                                 });
1180                                 pending_htlc = PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret };
1181                         },
1182                         _ => {}
1183                 }
1184
1185                 match pending_htlc {
1186                         PendingOutboundHTLC::CycledRoute { .. } => unreachable!(),
1187                         PendingOutboundHTLC::OutboundRoute { .. } => {
1188                                 mem::drop(channel_state);
1189
1190                                 let mut pending_events = self.pending_events.lock().unwrap();
1191                                 pending_events.push(events::Event::PaymentFailed {
1192                                         payment_hash: payment_hash.clone()
1193                                 });
1194                                 false
1195                         },
1196                         PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret } => {
1197                                 let err_packet = match onion_error {
1198                                         HTLCFailReason::Reason { failure_code, data } => {
1199                                                 let packet = ChannelManager::build_failure_packet(&incoming_packet_shared_secret, failure_code, &data[..]).encode();
1200                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &packet)
1201                                         },
1202                                         HTLCFailReason::ErrorPacket { err } => {
1203                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &err.data)
1204                                         }
1205                                 };
1206
1207                                 let (node_id, fail_msgs) = {
1208                                         let chan_id = match channel_state.short_to_id.get(&source_short_channel_id) {
1209                                                 Some(chan_id) => chan_id.clone(),
1210                                                 None => return false
1211                                         };
1212
1213                                         let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
1214                                         match chan.get_update_fail_htlc_and_commit(payment_hash, err_packet) {
1215                                                 Ok(msg) => (chan.get_their_node_id(), msg),
1216                                                 Err(_e) => {
1217                                                         //TODO: Do something with e?
1218                                                         return false;
1219                                                 },
1220                                         }
1221                                 };
1222
1223                                 match fail_msgs {
1224                                         Some((msg, commitment_msg, chan_monitor)) => {
1225                                                 mem::drop(channel_state);
1226
1227                                                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1228                                                         unimplemented!();// but def dont push the event...
1229                                                 }
1230
1231                                                 let mut pending_events = self.pending_events.lock().unwrap();
1232                                                 pending_events.push(events::Event::UpdateHTLCs {
1233                                                         node_id,
1234                                                         updates: msgs::CommitmentUpdate {
1235                                                                 update_add_htlcs: Vec::new(),
1236                                                                 update_fulfill_htlcs: Vec::new(),
1237                                                                 update_fail_htlcs: vec![msg],
1238                                                                 update_fail_malformed_htlcs: Vec::new(),
1239                                                                 commitment_signed: commitment_msg,
1240                                                         },
1241                                                 });
1242                                         },
1243                                         None => {},
1244                                 }
1245
1246                                 true
1247                         },
1248                 }
1249         }
1250
1251         /// Provides a payment preimage in response to a PaymentReceived event, returning true and
1252         /// generating message events for the net layer to claim the payment, if possible. Thus, you
1253         /// should probably kick the net layer to go send messages if this returns true!
1254         /// May panic if called except in response to a PaymentReceived event.
1255         pub fn claim_funds(&self, payment_preimage: [u8; 32]) -> bool {
1256                 self.claim_funds_internal(payment_preimage, true)
1257         }
1258         fn claim_funds_internal(&self, payment_preimage: [u8; 32], from_user: bool) -> bool {
1259                 let mut sha = Sha256::new();
1260                 sha.input(&payment_preimage);
1261                 let mut payment_hash = [0; 32];
1262                 sha.result(&mut payment_hash);
1263
1264                 let mut channel_state = self.channel_state.lock().unwrap();
1265                 let mut pending_htlc = {
1266                         match channel_state.claimable_htlcs.remove(&payment_hash) {
1267                                 Some(pending_htlc) => pending_htlc,
1268                                 None => return false,
1269                         }
1270                 };
1271
1272                 match pending_htlc {
1273                         PendingOutboundHTLC::CycledRoute { source_short_channel_id, incoming_packet_shared_secret, route, session_priv } => {
1274                                 if from_user { // This was the end hop back to us
1275                                         pending_htlc = PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret };
1276                                         channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::OutboundRoute { route, session_priv });
1277                                 } else { // This came from the first upstream node
1278                                         // Bank error in our favor! Maybe we should tell the user this somehow???
1279                                         pending_htlc = PendingOutboundHTLC::OutboundRoute { route, session_priv };
1280                                         channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret });
1281                                 }
1282                         },
1283                         _ => {},
1284                 }
1285
1286                 match pending_htlc {
1287                         PendingOutboundHTLC::CycledRoute { .. } => unreachable!(),
1288                         PendingOutboundHTLC::OutboundRoute { .. } => {
1289                                 if from_user {
1290                                         panic!("Called claim_funds with a preimage for an outgoing payment. There is nothing we can do with this, and something is seriously wrong if you knew this...");
1291                                 }
1292                                 mem::drop(channel_state);
1293                                 let mut pending_events = self.pending_events.lock().unwrap();
1294                                 pending_events.push(events::Event::PaymentSent {
1295                                         payment_preimage
1296                                 });
1297                                 false
1298                         },
1299                         PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, .. } => {
1300                                 let (node_id, fulfill_msgs) = {
1301                                         let chan_id = match channel_state.short_to_id.get(&source_short_channel_id) {
1302                                                 Some(chan_id) => chan_id.clone(),
1303                                                 None => {
1304                                                         // TODO: There is probably a channel manager somewhere that needs to
1305                                                         // learn the preimage as the channel already hit the chain and that's
1306                                                         // why its missing.
1307                                                         return false
1308                                                 }
1309                                         };
1310
1311                                         let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
1312                                         match chan.get_update_fulfill_htlc_and_commit(payment_preimage) {
1313                                                 Ok(msg) => (chan.get_their_node_id(), msg),
1314                                                 Err(_e) => {
1315                                                         // TODO: There is probably a channel manager somewhere that needs to
1316                                                         // learn the preimage as the channel may be about to hit the chain.
1317                                                         //TODO: Do something with e?
1318                                                         return false;
1319                                                 },
1320                                         }
1321                                 };
1322
1323                                 mem::drop(channel_state);
1324                                 if let Some(chan_monitor) = fulfill_msgs.1 {
1325                                         if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1326                                                 unimplemented!();// but def dont push the event...
1327                                         }
1328                                 }
1329
1330                                 if let Some((msg, commitment_msg)) = fulfill_msgs.0 {
1331                                         let mut pending_events = self.pending_events.lock().unwrap();
1332                                         pending_events.push(events::Event::UpdateHTLCs {
1333                                                 node_id: node_id,
1334                                                 updates: msgs::CommitmentUpdate {
1335                                                         update_add_htlcs: Vec::new(),
1336                                                         update_fulfill_htlcs: vec![msg],
1337                                                         update_fail_htlcs: Vec::new(),
1338                                                         update_fail_malformed_htlcs: Vec::new(),
1339                                                         commitment_signed: commitment_msg,
1340                                                 }
1341                                         });
1342                                 }
1343                                 true
1344                         },
1345                 }
1346         }
1347
1348         /// Gets the node_id held by this ChannelManager
1349         pub fn get_our_node_id(&self) -> PublicKey {
1350                 PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key)
1351         }
1352
1353         /// Used to restore channels to normal operation after a
1354         /// ChannelMonitorUpdateErr::TemporaryFailure was returned from a channel monitor update
1355         /// operation.
1356         pub fn test_restore_channel_monitor(&self) {
1357                 unimplemented!();
1358         }
1359 }
1360
1361 impl events::EventsProvider for ChannelManager {
1362         fn get_and_clear_pending_events(&self) -> Vec<events::Event> {
1363                 let mut pending_events = self.pending_events.lock().unwrap();
1364                 let mut ret = Vec::new();
1365                 mem::swap(&mut ret, &mut *pending_events);
1366                 ret
1367         }
1368 }
1369
1370 impl ChainListener for ChannelManager {
1371         fn block_connected(&self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) {
1372                 let mut new_events = Vec::new();
1373                 let mut failed_channels = Vec::new();
1374                 {
1375                         let mut channel_lock = self.channel_state.lock().unwrap();
1376                         let channel_state = channel_lock.borrow_parts();
1377                         let short_to_id = channel_state.short_to_id;
1378                         channel_state.by_id.retain(|_, channel| {
1379                                 let chan_res = channel.block_connected(header, height, txn_matched, indexes_of_txn_matched);
1380                                 if let Ok(Some(funding_locked)) = chan_res {
1381                                         let announcement_sigs = self.get_announcement_sigs(channel);
1382                                         new_events.push(events::Event::SendFundingLocked {
1383                                                 node_id: channel.get_their_node_id(),
1384                                                 msg: funding_locked,
1385                                                 announcement_sigs: announcement_sigs
1386                                         });
1387                                         short_to_id.insert(channel.get_short_channel_id().unwrap(), channel.channel_id());
1388                                 } else if let Err(e) = chan_res {
1389                                         new_events.push(events::Event::HandleError {
1390                                                 node_id: channel.get_their_node_id(),
1391                                                 action: e.action,
1392                                         });
1393                                         if channel.is_shutdown() {
1394                                                 return false;
1395                                         }
1396                                 }
1397                                 if let Some(funding_txo) = channel.get_funding_txo() {
1398                                         for tx in txn_matched {
1399                                                 for inp in tx.input.iter() {
1400                                                         if inp.previous_output == funding_txo.into_bitcoin_outpoint() {
1401                                                                 if let Some(short_id) = channel.get_short_channel_id() {
1402                                                                         short_to_id.remove(&short_id);
1403                                                                 }
1404                                                                 // It looks like our counterparty went on-chain. We go ahead and
1405                                                                 // broadcast our latest local state as well here, just in case its
1406                                                                 // some kind of SPV attack, though we expect these to be dropped.
1407                                                                 failed_channels.push(channel.force_shutdown());
1408                                                                 if let Ok(update) = self.get_channel_update(&channel) {
1409                                                                         new_events.push(events::Event::BroadcastChannelUpdate {
1410                                                                                 msg: update
1411                                                                         });
1412                                                                 }
1413                                                                 return false;
1414                                                         }
1415                                                 }
1416                                         }
1417                                 }
1418                                 if channel.is_funding_initiated() && channel.channel_monitor().would_broadcast_at_height(height) {
1419                                         if let Some(short_id) = channel.get_short_channel_id() {
1420                                                 short_to_id.remove(&short_id);
1421                                         }
1422                                         failed_channels.push(channel.force_shutdown());
1423                                         // If would_broadcast_at_height() is true, the channel_monitor will broadcast
1424                                         // the latest local tx for us, so we should skip that here (it doesn't really
1425                                         // hurt anything, but does make tests a bit simpler).
1426                                         failed_channels.last_mut().unwrap().0 = Vec::new();
1427                                         if let Ok(update) = self.get_channel_update(&channel) {
1428                                                 new_events.push(events::Event::BroadcastChannelUpdate {
1429                                                         msg: update
1430                                                 });
1431                                         }
1432                                         return false;
1433                                 }
1434                                 true
1435                         });
1436                 }
1437                 for failure in failed_channels.drain(..) {
1438                         self.finish_force_close_channel(failure);
1439                 }
1440                 let mut pending_events = self.pending_events.lock().unwrap();
1441                 for funding_locked in new_events.drain(..) {
1442                         pending_events.push(funding_locked);
1443                 }
1444                 self.latest_block_height.store(height as usize, Ordering::Release);
1445         }
1446
1447         /// We force-close the channel without letting our counterparty participate in the shutdown
1448         fn block_disconnected(&self, header: &BlockHeader) {
1449                 let mut new_events = Vec::new();
1450                 let mut failed_channels = Vec::new();
1451                 {
1452                         let mut channel_lock = self.channel_state.lock().unwrap();
1453                         let channel_state = channel_lock.borrow_parts();
1454                         let short_to_id = channel_state.short_to_id;
1455                         channel_state.by_id.retain(|_,  v| {
1456                                 if v.block_disconnected(header) {
1457                                         if let Some(short_id) = v.get_short_channel_id() {
1458                                                 short_to_id.remove(&short_id);
1459                                         }
1460                                         failed_channels.push(v.force_shutdown());
1461                                         if let Ok(update) = self.get_channel_update(&v) {
1462                                                 new_events.push(events::Event::BroadcastChannelUpdate {
1463                                                         msg: update
1464                                                 });
1465                                         }
1466                                         false
1467                                 } else {
1468                                         true
1469                                 }
1470                         });
1471                 }
1472                 for failure in failed_channels.drain(..) {
1473                         self.finish_force_close_channel(failure);
1474                 }
1475                 if !new_events.is_empty() {
1476                         let mut pending_events = self.pending_events.lock().unwrap();
1477                         for funding_locked in new_events.drain(..) {
1478                                 pending_events.push(funding_locked);
1479                         }
1480                 }
1481                 self.latest_block_height.fetch_sub(1, Ordering::AcqRel);
1482         }
1483 }
1484
1485 impl ChannelMessageHandler for ChannelManager {
1486         //TODO: Handle errors and close channel (or so)
1487         fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &msgs::OpenChannel) -> Result<msgs::AcceptChannel, HandleError> {
1488                 if msg.chain_hash != self.genesis_hash {
1489                         return Err(HandleError{err: "Unknown genesis block hash", action: None});
1490                 }
1491                 let mut channel_state = self.channel_state.lock().unwrap();
1492                 if channel_state.by_id.contains_key(&msg.temporary_channel_id) {
1493                         return Err(HandleError{err: "temporary_channel_id collision!", action: None});
1494                 }
1495
1496                 let chan_keys = if cfg!(feature = "fuzztarget") {
1497                         ChannelKeys {
1498                                 funding_key:               SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 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, 0]).unwrap(),
1499                                 revocation_base_key:       SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 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, 0]).unwrap(),
1500                                 payment_base_key:          SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 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, 0]).unwrap(),
1501                                 delayed_payment_base_key:  SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 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, 0]).unwrap(),
1502                                 htlc_base_key:             SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 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, 0]).unwrap(),
1503                                 channel_close_key:         SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 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, 0]).unwrap(),
1504                                 channel_monitor_claim_key: SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 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, 0]).unwrap(),
1505                                 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, 0, 0],
1506                         }
1507                 } else {
1508                         let mut key_seed = [0u8; 32];
1509                         rng::fill_bytes(&mut key_seed);
1510                         match ChannelKeys::new_from_seed(&key_seed) {
1511                                 Ok(key) => key,
1512                                 Err(_) => panic!("RNG is busted!")
1513                         }
1514                 };
1515
1516                 let channel = Channel::new_from_req(&*self.fee_estimator, chan_keys, their_node_id.clone(), msg, 0, false, self.announce_channels_publicly, Arc::clone(&self.logger))?;
1517                 let accept_msg = channel.get_accept_channel()?;
1518                 channel_state.by_id.insert(channel.channel_id(), channel);
1519                 Ok(accept_msg)
1520         }
1521
1522         fn handle_accept_channel(&self, their_node_id: &PublicKey, msg: &msgs::AcceptChannel) -> Result<(), HandleError> {
1523                 let (value, output_script, user_id) = {
1524                         let mut channel_state = self.channel_state.lock().unwrap();
1525                         match channel_state.by_id.get_mut(&msg.temporary_channel_id) {
1526                                 Some(chan) => {
1527                                         if chan.get_their_node_id() != *their_node_id {
1528                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1529                                         }
1530                                         chan.accept_channel(&msg)?;
1531                                         (chan.get_value_satoshis(), chan.get_funding_redeemscript().to_v0_p2wsh(), chan.get_user_id())
1532                                 },
1533                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1534                         }
1535                 };
1536                 let mut pending_events = self.pending_events.lock().unwrap();
1537                 pending_events.push(events::Event::FundingGenerationReady {
1538                         temporary_channel_id: msg.temporary_channel_id,
1539                         channel_value_satoshis: value,
1540                         output_script: output_script,
1541                         user_channel_id: user_id,
1542                 });
1543                 Ok(())
1544         }
1545
1546         fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) -> Result<msgs::FundingSigned, HandleError> {
1547                 let (chan, funding_msg, monitor_update) = {
1548                         let mut channel_state = self.channel_state.lock().unwrap();
1549                         match channel_state.by_id.entry(msg.temporary_channel_id.clone()) {
1550                                 hash_map::Entry::Occupied(mut chan) => {
1551                                         if chan.get().get_their_node_id() != *their_node_id {
1552                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1553                                         }
1554                                         match chan.get_mut().funding_created(msg) {
1555                                                 Ok((funding_msg, monitor_update)) => {
1556                                                         (chan.remove(), funding_msg, monitor_update)
1557                                                 },
1558                                                 Err(e) => {
1559                                                         //TODO: Possibly remove the channel depending on e.action
1560                                                         return Err(e);
1561                                                 }
1562                                         }
1563                                 },
1564                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1565                         }
1566                 }; // Release channel lock for install_watch_outpoint call,
1567                    // note that this means if the remote end is misbehaving and sends a message for the same
1568                    // channel back-to-back with funding_created, we'll end up thinking they sent a message
1569                    // for a bogus channel.
1570                 if let Err(_e) = self.monitor.add_update_monitor(monitor_update.get_funding_txo().unwrap(), monitor_update) {
1571                         unimplemented!();
1572                 }
1573                 let mut channel_state = self.channel_state.lock().unwrap();
1574                 match channel_state.by_id.entry(funding_msg.channel_id) {
1575                         hash_map::Entry::Occupied(_) => {
1576                                 return Err(HandleError {
1577                                         err: "Duplicate channel_id!",
1578                                         action: Some(msgs::ErrorAction::SendErrorMessage { msg: msgs::ErrorMessage { channel_id: funding_msg.channel_id, data: "Already had channel with the new channel_id".to_owned() } })
1579                                 });
1580                         },
1581                         hash_map::Entry::Vacant(e) => {
1582                                 e.insert(chan);
1583                         }
1584                 }
1585                 Ok(funding_msg)
1586         }
1587
1588         fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) -> Result<(), HandleError> {
1589                 let (funding_txo, user_id, monitor) = {
1590                         let mut channel_state = self.channel_state.lock().unwrap();
1591                         match channel_state.by_id.get_mut(&msg.channel_id) {
1592                                 Some(chan) => {
1593                                         if chan.get_their_node_id() != *their_node_id {
1594                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1595                                         }
1596                                         let chan_monitor = chan.funding_signed(&msg)?;
1597                                         (chan.get_funding_txo().unwrap(), chan.get_user_id(), chan_monitor)
1598                                 },
1599                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1600                         }
1601                 };
1602                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor) {
1603                         unimplemented!();
1604                 }
1605                 let mut pending_events = self.pending_events.lock().unwrap();
1606                 pending_events.push(events::Event::FundingBroadcastSafe {
1607                         funding_txo: funding_txo,
1608                         user_channel_id: user_id,
1609                 });
1610                 Ok(())
1611         }
1612
1613         fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &msgs::FundingLocked) -> Result<Option<msgs::AnnouncementSignatures>, HandleError> {
1614                 let mut channel_state = self.channel_state.lock().unwrap();
1615                 match channel_state.by_id.get_mut(&msg.channel_id) {
1616                         Some(chan) => {
1617                                 if chan.get_their_node_id() != *their_node_id {
1618                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1619                                 }
1620                                 chan.funding_locked(&msg)?;
1621                                 return Ok(self.get_announcement_sigs(chan));
1622                         },
1623                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1624                 };
1625         }
1626
1627         fn handle_shutdown(&self, their_node_id: &PublicKey, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>), HandleError> {
1628                 let (res, chan_option) = {
1629                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1630                         let channel_state = channel_state_lock.borrow_parts();
1631
1632                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1633                                 hash_map::Entry::Occupied(mut chan_entry) => {
1634                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1635                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1636                                         }
1637                                         let res = chan_entry.get_mut().shutdown(&*self.fee_estimator, &msg)?;
1638                                         if chan_entry.get().is_shutdown() {
1639                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
1640                                                         channel_state.short_to_id.remove(&short_id);
1641                                                 }
1642                                                 (res, Some(chan_entry.remove_entry().1))
1643                                         } else { (res, None) }
1644                                 },
1645                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1646                         }
1647                 };
1648                 for payment_hash in res.2 {
1649                         // unknown_next_peer...I dunno who that is anymore....
1650                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
1651                 }
1652                 if let Some(chan) = chan_option {
1653                         if let Ok(update) = self.get_channel_update(&chan) {
1654                                 let mut events = self.pending_events.lock().unwrap();
1655                                 events.push(events::Event::BroadcastChannelUpdate {
1656                                         msg: update
1657                                 });
1658                         }
1659                 }
1660                 Ok((res.0, res.1))
1661         }
1662
1663         fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &msgs::ClosingSigned) -> Result<Option<msgs::ClosingSigned>, HandleError> {
1664                 let (res, chan_option) = {
1665                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1666                         let channel_state = channel_state_lock.borrow_parts();
1667                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1668                                 hash_map::Entry::Occupied(mut chan_entry) => {
1669                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1670                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1671                                         }
1672                                         let res = chan_entry.get_mut().closing_signed(&*self.fee_estimator, &msg)?;
1673                                         if res.1.is_some() {
1674                                                 // We're done with this channel, we've got a signed closing transaction and
1675                                                 // will send the closing_signed back to the remote peer upon return. This
1676                                                 // also implies there are no pending HTLCs left on the channel, so we can
1677                                                 // fully delete it from tracking (the channel monitor is still around to
1678                                                 // watch for old state broadcasts)!
1679                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
1680                                                         channel_state.short_to_id.remove(&short_id);
1681                                                 }
1682                                                 (res, Some(chan_entry.remove_entry().1))
1683                                         } else { (res, None) }
1684                                 },
1685                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1686                         }
1687                 };
1688                 if let Some(broadcast_tx) = res.1 {
1689                         self.tx_broadcaster.broadcast_transaction(&broadcast_tx);
1690                 }
1691                 if let Some(chan) = chan_option {
1692                         if let Ok(update) = self.get_channel_update(&chan) {
1693                                 let mut events = self.pending_events.lock().unwrap();
1694                                 events.push(events::Event::BroadcastChannelUpdate {
1695                                         msg: update
1696                                 });
1697                         }
1698                 }
1699                 Ok(res.0)
1700         }
1701
1702         fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) -> Result<(), msgs::HandleError> {
1703                 //TODO: BOLT 4 points out a specific attack where a peer may re-send an onion packet and
1704                 //determine the state of the payment based on our response/if we forward anything/the time
1705                 //we take to respond. We should take care to avoid allowing such an attack.
1706                 //
1707                 //TODO: There exists a further attack where a node may garble the onion data, forward it to
1708                 //us repeatedly garbled in different ways, and compare our error messages, which are
1709                 //encrypted with the same key. Its not immediately obvious how to usefully exploit that,
1710                 //but we should prevent it anyway.
1711
1712                 let (mut pending_forward_info, shared_secret, mut channel_state_lock) = self.decode_update_add_htlc_onion(msg);
1713                 let channel_state = channel_state_lock.borrow_parts();
1714
1715                 let claimable_htlcs_entry = channel_state.claimable_htlcs.entry(msg.payment_hash.clone());
1716
1717                 // We dont correctly handle payments that route through us twice on their way to their
1718                 // destination. That's OK since those nodes are probably busted or trying to do network
1719                 // mapping through repeated loops. In either case, we want them to stop talking to us, so
1720                 // we send permanent_node_failure.
1721                 let mut will_forward = false;
1722                 if let PendingHTLCStatus::Forward(PendingForwardHTLCInfo { short_channel_id, .. }) = pending_forward_info {
1723                         if let &hash_map::Entry::Occupied(ref e) = &claimable_htlcs_entry {
1724                                 let mut acceptable_cycle = false;
1725                                 if let &PendingOutboundHTLC::OutboundRoute { .. } = e.get() {
1726                                         acceptable_cycle = short_channel_id == 0;
1727                                 }
1728                                 if !acceptable_cycle {
1729                                         log_info!(self, "Failed to accept incoming HTLC: Payment looped through us twice");
1730                                         pending_forward_info = PendingHTLCStatus::Fail(HTLCFailureMsg::Relay(msgs::UpdateFailHTLC {
1731                                                 channel_id: msg.channel_id,
1732                                                 htlc_id: msg.htlc_id,
1733                                                 reason: ChannelManager::build_first_hop_failure_packet(&shared_secret.unwrap(), 0x4000 | 0x2000 | 2, &[0;0]),
1734                                         }));
1735                                 } else {
1736                                         will_forward = true;
1737                                 }
1738                         } else {
1739                                 will_forward = true;
1740                         }
1741                 }
1742
1743                 let (source_short_channel_id, res) = match channel_state.by_id.get_mut(&msg.channel_id) {
1744                         Some(chan) => {
1745                                 if chan.get_their_node_id() != *their_node_id {
1746                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1747                                 }
1748                                 if !chan.is_usable() {
1749                                         return Err(HandleError{err: "Channel not yet available for receiving HTLCs", action: None});
1750                                 }
1751                                 let short_channel_id = chan.get_short_channel_id().unwrap();
1752                                 if let PendingHTLCStatus::Forward(ref mut forward_info) = pending_forward_info {
1753                                         forward_info.prev_short_channel_id = short_channel_id;
1754                                 }
1755                                 (short_channel_id, chan.update_add_htlc(&msg, pending_forward_info)?)
1756                         },
1757                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None}),
1758                 };
1759
1760                 if will_forward {
1761                         match claimable_htlcs_entry {
1762                                 hash_map::Entry::Occupied(mut e) => {
1763                                         let outbound_route = e.get_mut();
1764                                         let (route, session_priv) = match outbound_route {
1765                                                 &mut PendingOutboundHTLC::OutboundRoute { ref route, ref session_priv } => {
1766                                                         (route.clone(), session_priv.clone())
1767                                                 },
1768                                                 _ => unreachable!(),
1769                                         };
1770                                         *outbound_route = PendingOutboundHTLC::CycledRoute {
1771                                                 source_short_channel_id,
1772                                                 incoming_packet_shared_secret: shared_secret.unwrap(),
1773                                                 route,
1774                                                 session_priv,
1775                                         };
1776                                 },
1777                                 hash_map::Entry::Vacant(e) => {
1778                                         e.insert(PendingOutboundHTLC::IntermediaryHopData {
1779                                                 source_short_channel_id,
1780                                                 incoming_packet_shared_secret: shared_secret.unwrap(),
1781                                         });
1782                                 }
1783                         }
1784                 }
1785
1786                 Ok(res)
1787         }
1788
1789         fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) -> Result<(), HandleError> {
1790                 //TODO: Delay the claimed_funds relaying just like we do outbound relay!
1791                 // Claim funds first, cause we don't really care if the channel we received the message on
1792                 // is broken, we may have enough info to get our own money!
1793                 self.claim_funds_internal(msg.payment_preimage.clone(), false);
1794
1795                 let mut channel_state = self.channel_state.lock().unwrap();
1796                 match channel_state.by_id.get_mut(&msg.channel_id) {
1797                         Some(chan) => {
1798                                 if chan.get_their_node_id() != *their_node_id {
1799                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1800                                 }
1801                                 chan.update_fulfill_htlc(&msg)
1802                         },
1803                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1804                 }
1805         }
1806
1807         fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) -> Result<Option<msgs::HTLCFailChannelUpdate>, HandleError> {
1808                 let mut channel_state = self.channel_state.lock().unwrap();
1809                 let payment_hash = match channel_state.by_id.get_mut(&msg.channel_id) {
1810                         Some(chan) => {
1811                                 if chan.get_their_node_id() != *their_node_id {
1812                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1813                                 }
1814                                 chan.update_fail_htlc(&msg, HTLCFailReason::ErrorPacket { err: msg.reason.clone() })
1815                         },
1816                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1817                 }?;
1818
1819                 if let Some(pending_htlc) = channel_state.claimable_htlcs.get(&payment_hash) {
1820                         match pending_htlc {
1821                                 &PendingOutboundHTLC::OutboundRoute { ref route, ref session_priv } => {
1822                                         // Handle packed channel/node updates for passing back for the route handler
1823                                         let mut packet_decrypted = msg.reason.data.clone();
1824                                         let mut res = None;
1825                                         Self::construct_onion_keys_callback(&self.secp_ctx, &route, &session_priv, |shared_secret, _, _, route_hop| {
1826                                                 if res.is_some() { return; }
1827
1828                                                 let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
1829
1830                                                 let mut decryption_tmp = Vec::with_capacity(packet_decrypted.len());
1831                                                 decryption_tmp.resize(packet_decrypted.len(), 0);
1832                                                 let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
1833                                                 chacha.process(&packet_decrypted, &mut decryption_tmp[..]);
1834                                                 packet_decrypted = decryption_tmp;
1835
1836                                                 if let Ok(err_packet) = msgs::DecodedOnionErrorPacket::decode(&packet_decrypted) {
1837                                                         if err_packet.failuremsg.len() >= 2 {
1838                                                                 let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
1839
1840                                                                 let mut hmac = Hmac::new(Sha256::new(), &um);
1841                                                                 hmac.input(&err_packet.encode()[32..]);
1842                                                                 let mut calc_tag = [0u8; 32];
1843                                                                 hmac.raw_result(&mut calc_tag);
1844                                                                 if crypto::util::fixed_time_eq(&calc_tag, &err_packet.hmac) {
1845                                                                         const UNKNOWN_CHAN: u16 = 0x4000|10;
1846                                                                         const TEMP_CHAN_FAILURE: u16 = 0x4000|7;
1847                                                                         match byte_utils::slice_to_be16(&err_packet.failuremsg[0..2]) {
1848                                                                                 TEMP_CHAN_FAILURE => {
1849                                                                                         if err_packet.failuremsg.len() >= 4 {
1850                                                                                                 let update_len = byte_utils::slice_to_be16(&err_packet.failuremsg[2..4]) as usize;
1851                                                                                                 if err_packet.failuremsg.len() >= 4 + update_len {
1852                                                                                                         if let Ok(chan_update) = msgs::ChannelUpdate::decode(&err_packet.failuremsg[4..4 + update_len]) {
1853                                                                                                                 res = Some(msgs::HTLCFailChannelUpdate::ChannelUpdateMessage {
1854                                                                                                                         msg: chan_update,
1855                                                                                                                 });
1856                                                                                                         }
1857                                                                                                 }
1858                                                                                         }
1859                                                                                 },
1860                                                                                 UNKNOWN_CHAN => {
1861                                                                                         // No such next-hop. We know this came from the
1862                                                                                         // current node as the HMAC validated.
1863                                                                                         res = Some(msgs::HTLCFailChannelUpdate::ChannelClosed {
1864                                                                                                 short_channel_id: route_hop.short_channel_id
1865                                                                                         });
1866                                                                                 },
1867                                                                                 _ => {}, //TODO: Enumerate all of these!
1868                                                                         }
1869                                                                 }
1870                                                         }
1871                                                 }
1872                                         }).unwrap();
1873                                         Ok(res)
1874                                 },
1875                                 _ => { Ok(None) },
1876                         }
1877                 } else {
1878                         Ok(None)
1879                 }
1880         }
1881
1882         fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) -> Result<(), HandleError> {
1883                 let mut channel_state = self.channel_state.lock().unwrap();
1884                 match channel_state.by_id.get_mut(&msg.channel_id) {
1885                         Some(chan) => {
1886                                 if chan.get_their_node_id() != *their_node_id {
1887                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1888                                 }
1889                                 chan.update_fail_malformed_htlc(&msg, HTLCFailReason::Reason { failure_code: msg.failure_code, data: Vec::new() })
1890                         },
1891                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1892                 }
1893         }
1894
1895         fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>), HandleError> {
1896                 let (revoke_and_ack, commitment_signed, chan_monitor) = {
1897                         let mut channel_state = self.channel_state.lock().unwrap();
1898                         match channel_state.by_id.get_mut(&msg.channel_id) {
1899                                 Some(chan) => {
1900                                         if chan.get_their_node_id() != *their_node_id {
1901                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1902                                         }
1903                                         chan.commitment_signed(&msg)?
1904                                 },
1905                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1906                         }
1907                 };
1908                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1909                         unimplemented!();
1910                 }
1911
1912                 Ok((revoke_and_ack, commitment_signed))
1913         }
1914
1915         fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) -> Result<Option<msgs::CommitmentUpdate>, HandleError> {
1916                 let (res, mut pending_forwards, mut pending_failures, chan_monitor) = {
1917                         let mut channel_state = self.channel_state.lock().unwrap();
1918                         match channel_state.by_id.get_mut(&msg.channel_id) {
1919                                 Some(chan) => {
1920                                         if chan.get_their_node_id() != *their_node_id {
1921                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1922                                         }
1923                                         chan.revoke_and_ack(&msg)?
1924                                 },
1925                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1926                         }
1927                 };
1928                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1929                         unimplemented!();
1930                 }
1931                 for failure in pending_failures.drain(..) {
1932                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &failure.0, failure.1);
1933                 }
1934
1935                 let mut forward_event = None;
1936                 if !pending_forwards.is_empty() {
1937                         let mut channel_state = self.channel_state.lock().unwrap();
1938                         if channel_state.forward_htlcs.is_empty() {
1939                                 forward_event = Some(Instant::now() + Duration::from_millis(((rng::rand_f32() * 4.0 + 1.0) * MIN_HTLC_RELAY_HOLDING_CELL_MILLIS as f32) as u64));
1940                                 channel_state.next_forward = forward_event.unwrap();
1941                         }
1942                         for forward_info in pending_forwards.drain(..) {
1943                                 match channel_state.forward_htlcs.entry(forward_info.short_channel_id) {
1944                                         hash_map::Entry::Occupied(mut entry) => {
1945                                                 entry.get_mut().push(forward_info);
1946                                         },
1947                                         hash_map::Entry::Vacant(entry) => {
1948                                                 entry.insert(vec!(forward_info));
1949                                         }
1950                                 }
1951                         }
1952                 }
1953                 match forward_event {
1954                         Some(time) => {
1955                                 let mut pending_events = self.pending_events.lock().unwrap();
1956                                 pending_events.push(events::Event::PendingHTLCsForwardable {
1957                                         time_forwardable: time
1958                                 });
1959                         }
1960                         None => {},
1961                 }
1962
1963                 Ok(res)
1964         }
1965
1966         fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) -> Result<(), HandleError> {
1967                 let mut channel_state = self.channel_state.lock().unwrap();
1968                 match channel_state.by_id.get_mut(&msg.channel_id) {
1969                         Some(chan) => {
1970                                 if chan.get_their_node_id() != *their_node_id {
1971                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1972                                 }
1973                                 chan.update_fee(&*self.fee_estimator, &msg)
1974                         },
1975                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1976                 }
1977         }
1978
1979         fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) -> Result<(), HandleError> {
1980                 let (chan_announcement, chan_update) = {
1981                         let mut channel_state = self.channel_state.lock().unwrap();
1982                         match channel_state.by_id.get_mut(&msg.channel_id) {
1983                                 Some(chan) => {
1984                                         if chan.get_their_node_id() != *their_node_id {
1985                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1986                                         }
1987                                         if !chan.is_usable() {
1988                                                 return Err(HandleError{err: "Got an announcement_signatures before we were ready for it", action: None });
1989                                         }
1990
1991                                         let our_node_id = self.get_our_node_id();
1992                                         let (announcement, our_bitcoin_sig) = chan.get_channel_announcement(our_node_id.clone(), self.genesis_hash.clone())?;
1993
1994                                         let were_node_one = announcement.node_id_1 == our_node_id;
1995                                         let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
1996                                         secp_call!(self.secp_ctx.verify(&msghash, &msg.node_signature, if were_node_one { &announcement.node_id_2 } else { &announcement.node_id_1 }));
1997                                         secp_call!(self.secp_ctx.verify(&msghash, &msg.bitcoin_signature, if were_node_one { &announcement.bitcoin_key_2 } else { &announcement.bitcoin_key_1 }));
1998
1999                                         let our_node_sig = self.secp_ctx.sign(&msghash, &self.our_network_key);
2000
2001                                         (msgs::ChannelAnnouncement {
2002                                                 node_signature_1: if were_node_one { our_node_sig } else { msg.node_signature },
2003                                                 node_signature_2: if were_node_one { msg.node_signature } else { our_node_sig },
2004                                                 bitcoin_signature_1: if were_node_one { our_bitcoin_sig } else { msg.bitcoin_signature },
2005                                                 bitcoin_signature_2: if were_node_one { msg.bitcoin_signature } else { our_bitcoin_sig },
2006                                                 contents: announcement,
2007                                         }, self.get_channel_update(chan).unwrap()) // can only fail if we're not in a ready state
2008                                 },
2009                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
2010                         }
2011                 };
2012                 let mut pending_events = self.pending_events.lock().unwrap();
2013                 pending_events.push(events::Event::BroadcastChannelAnnouncement { msg: chan_announcement, update_msg: chan_update });
2014                 Ok(())
2015         }
2016
2017         fn peer_disconnected(&self, their_node_id: &PublicKey, no_connection_possible: bool) {
2018                 let mut new_events = Vec::new();
2019                 let mut failed_channels = Vec::new();
2020                 {
2021                         let mut channel_state_lock = self.channel_state.lock().unwrap();
2022                         let channel_state = channel_state_lock.borrow_parts();
2023                         let short_to_id = channel_state.short_to_id;
2024                         if no_connection_possible {
2025                                 channel_state.by_id.retain(|_, chan| {
2026                                         if chan.get_their_node_id() == *their_node_id {
2027                                                 if let Some(short_id) = chan.get_short_channel_id() {
2028                                                         short_to_id.remove(&short_id);
2029                                                 }
2030                                                 failed_channels.push(chan.force_shutdown());
2031                                                 if let Ok(update) = self.get_channel_update(&chan) {
2032                                                         new_events.push(events::Event::BroadcastChannelUpdate {
2033                                                                 msg: update
2034                                                         });
2035                                                 }
2036                                                 false
2037                                         } else {
2038                                                 true
2039                                         }
2040                                 });
2041                         } else {
2042                                 for chan in channel_state.by_id {
2043                                         if chan.1.get_their_node_id() == *their_node_id {
2044                                                 //TODO: mark channel disabled (and maybe announce such after a timeout). Also
2045                                                 //fail and wipe any uncommitted outbound HTLCs as those are considered after
2046                                                 //reconnect.
2047                                         }
2048                                 }
2049                         }
2050                 }
2051                 for failure in failed_channels.drain(..) {
2052                         self.finish_force_close_channel(failure);
2053                 }
2054                 if !new_events.is_empty() {
2055                         let mut pending_events = self.pending_events.lock().unwrap();
2056                         for event in new_events.drain(..) {
2057                                 pending_events.push(event);
2058                         }
2059                 }
2060         }
2061
2062         fn handle_error(&self, their_node_id: &PublicKey, msg: &msgs::ErrorMessage) {
2063                 if msg.channel_id == [0; 32] {
2064                         for chan in self.list_channels() {
2065                                 if chan.remote_network_id == *their_node_id {
2066                                         self.force_close_channel(&chan.channel_id);
2067                                 }
2068                         }
2069                 } else {
2070                         self.force_close_channel(&msg.channel_id);
2071                 }
2072         }
2073 }
2074
2075 #[cfg(test)]
2076 mod tests {
2077         use chain::chaininterface;
2078         use chain::transaction::OutPoint;
2079         use chain::chaininterface::ChainListener;
2080         use ln::channelmanager::{ChannelManager,OnionKeys};
2081         use ln::router::{Route, RouteHop, Router};
2082         use ln::msgs;
2083         use ln::msgs::{MsgEncodable,ChannelMessageHandler,RoutingMessageHandler};
2084         use util::test_utils;
2085         use util::events::{Event, EventsProvider};
2086         use util::logger::Logger;
2087
2088         use bitcoin::util::hash::Sha256dHash;
2089         use bitcoin::blockdata::block::{Block, BlockHeader};
2090         use bitcoin::blockdata::transaction::{Transaction, TxOut};
2091         use bitcoin::network::constants::Network;
2092         use bitcoin::network::serialize::serialize;
2093         use bitcoin::network::serialize::BitcoinHash;
2094
2095         use hex;
2096
2097         use secp256k1::Secp256k1;
2098         use secp256k1::key::{PublicKey,SecretKey};
2099
2100         use crypto::sha2::Sha256;
2101         use crypto::digest::Digest;
2102
2103         use rand::{thread_rng,Rng};
2104
2105         use std::collections::HashMap;
2106         use std::default::Default;
2107         use std::sync::{Arc, Mutex};
2108         use std::time::Instant;
2109         use std::mem;
2110
2111         fn build_test_onion_keys() -> Vec<OnionKeys> {
2112                 // Keys from BOLT 4, used in both test vector tests
2113                 let secp_ctx = Secp256k1::new();
2114
2115                 let route = Route {
2116                         hops: vec!(
2117                                         RouteHop {
2118                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]).unwrap(),
2119                                                 short_channel_id: 0, fee_msat: 0, cltv_expiry_delta: 0 // Test vectors are garbage and not generateble from a RouteHop, we fill in payloads manually
2120                                         },
2121                                         RouteHop {
2122                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("0324653eac434488002cc06bbfb7f10fe18991e35f9fe4302dbea6d2353dc0ab1c").unwrap()[..]).unwrap(),
2123                                                 short_channel_id: 0, fee_msat: 0, cltv_expiry_delta: 0 // Test vectors are garbage and not generateble from a RouteHop, we fill in payloads manually
2124                                         },
2125                                         RouteHop {
2126                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("027f31ebc5462c1fdce1b737ecff52d37d75dea43ce11c74d25aa297165faa2007").unwrap()[..]).unwrap(),
2127                                                 short_channel_id: 0, fee_msat: 0, cltv_expiry_delta: 0 // Test vectors are garbage and not generateble from a RouteHop, we fill in payloads manually
2128                                         },
2129                                         RouteHop {
2130                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]).unwrap(),
2131                                                 short_channel_id: 0, fee_msat: 0, cltv_expiry_delta: 0 // Test vectors are garbage and not generateble from a RouteHop, we fill in payloads manually
2132                                         },
2133                                         RouteHop {
2134                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("02edabbd16b41c8371b92ef2f04c1185b4f03b6dcd52ba9b78d9d7c89c8f221145").unwrap()[..]).unwrap(),
2135                                                 short_channel_id: 0, fee_msat: 0, cltv_expiry_delta: 0 // Test vectors are garbage and not generateble from a RouteHop, we fill in payloads manually
2136                                         },
2137                         ),
2138                 };
2139
2140                 let session_priv = SecretKey::from_slice(&secp_ctx, &hex::decode("4141414141414141414141414141414141414141414141414141414141414141").unwrap()[..]).unwrap();
2141
2142                 let onion_keys = ChannelManager::construct_onion_keys(&secp_ctx, &route, &session_priv).unwrap();
2143                 assert_eq!(onion_keys.len(), route.hops.len());
2144                 onion_keys
2145         }
2146
2147         #[test]
2148         fn onion_vectors() {
2149                 // Packet creation test vectors from BOLT 4
2150                 let onion_keys = build_test_onion_keys();
2151
2152                 assert_eq!(onion_keys[0].shared_secret[..], hex::decode("53eb63ea8a3fec3b3cd433b85cd62a4b145e1dda09391b348c4e1cd36a03ea66").unwrap()[..]);
2153                 assert_eq!(onion_keys[0].blinding_factor[..], hex::decode("2ec2e5da605776054187180343287683aa6a51b4b1c04d6dd49c45d8cffb3c36").unwrap()[..]);
2154                 assert_eq!(onion_keys[0].ephemeral_pubkey.serialize()[..], hex::decode("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]);
2155                 assert_eq!(onion_keys[0].rho, hex::decode("ce496ec94def95aadd4bec15cdb41a740c9f2b62347c4917325fcc6fb0453986").unwrap()[..]);
2156                 assert_eq!(onion_keys[0].mu, hex::decode("b57061dc6d0a2b9f261ac410c8b26d64ac5506cbba30267a649c28c179400eba").unwrap()[..]);
2157
2158                 assert_eq!(onion_keys[1].shared_secret[..], hex::decode("a6519e98832a0b179f62123b3567c106db99ee37bef036e783263602f3488fae").unwrap()[..]);
2159                 assert_eq!(onion_keys[1].blinding_factor[..], hex::decode("bf66c28bc22e598cfd574a1931a2bafbca09163df2261e6d0056b2610dab938f").unwrap()[..]);
2160                 assert_eq!(onion_keys[1].ephemeral_pubkey.serialize()[..], hex::decode("028f9438bfbf7feac2e108d677e3a82da596be706cc1cf342b75c7b7e22bf4e6e2").unwrap()[..]);
2161                 assert_eq!(onion_keys[1].rho, hex::decode("450ffcabc6449094918ebe13d4f03e433d20a3d28a768203337bc40b6e4b2c59").unwrap()[..]);
2162                 assert_eq!(onion_keys[1].mu, hex::decode("05ed2b4a3fb023c2ff5dd6ed4b9b6ea7383f5cfe9d59c11d121ec2c81ca2eea9").unwrap()[..]);
2163
2164                 assert_eq!(onion_keys[2].shared_secret[..], hex::decode("3a6b412548762f0dbccce5c7ae7bb8147d1caf9b5471c34120b30bc9c04891cc").unwrap()[..]);
2165                 assert_eq!(onion_keys[2].blinding_factor[..], hex::decode("a1f2dadd184eb1627049673f18c6325814384facdee5bfd935d9cb031a1698a5").unwrap()[..]);
2166                 assert_eq!(onion_keys[2].ephemeral_pubkey.serialize()[..], hex::decode("03bfd8225241ea71cd0843db7709f4c222f62ff2d4516fd38b39914ab6b83e0da0").unwrap()[..]);
2167                 assert_eq!(onion_keys[2].rho, hex::decode("11bf5c4f960239cb37833936aa3d02cea82c0f39fd35f566109c41f9eac8deea").unwrap()[..]);
2168                 assert_eq!(onion_keys[2].mu, hex::decode("caafe2820fa00eb2eeb78695ae452eba38f5a53ed6d53518c5c6edf76f3f5b78").unwrap()[..]);
2169
2170                 assert_eq!(onion_keys[3].shared_secret[..], hex::decode("21e13c2d7cfe7e18836df50872466117a295783ab8aab0e7ecc8c725503ad02d").unwrap()[..]);
2171                 assert_eq!(onion_keys[3].blinding_factor[..], hex::decode("7cfe0b699f35525029ae0fa437c69d0f20f7ed4e3916133f9cacbb13c82ff262").unwrap()[..]);
2172                 assert_eq!(onion_keys[3].ephemeral_pubkey.serialize()[..], hex::decode("031dde6926381289671300239ea8e57ffaf9bebd05b9a5b95beaf07af05cd43595").unwrap()[..]);
2173                 assert_eq!(onion_keys[3].rho, hex::decode("cbe784ab745c13ff5cffc2fbe3e84424aa0fd669b8ead4ee562901a4a4e89e9e").unwrap()[..]);
2174                 assert_eq!(onion_keys[3].mu, hex::decode("5052aa1b3d9f0655a0932e50d42f0c9ba0705142c25d225515c45f47c0036ee9").unwrap()[..]);
2175
2176                 assert_eq!(onion_keys[4].shared_secret[..], hex::decode("b5756b9b542727dbafc6765a49488b023a725d631af688fc031217e90770c328").unwrap()[..]);
2177                 assert_eq!(onion_keys[4].blinding_factor[..], hex::decode("c96e00dddaf57e7edcd4fb5954be5b65b09f17cb6d20651b4e90315be5779205").unwrap()[..]);
2178                 assert_eq!(onion_keys[4].ephemeral_pubkey.serialize()[..], hex::decode("03a214ebd875aab6ddfd77f22c5e7311d7f77f17a169e599f157bbcdae8bf071f4").unwrap()[..]);
2179                 assert_eq!(onion_keys[4].rho, hex::decode("034e18b8cc718e8af6339106e706c52d8df89e2b1f7e9142d996acf88df8799b").unwrap()[..]);
2180                 assert_eq!(onion_keys[4].mu, hex::decode("8e45e5c61c2b24cb6382444db6698727afb063adecd72aada233d4bf273d975a").unwrap()[..]);
2181
2182                 // Test vectors below are flat-out wrong: they claim to set outgoing_cltv_value to non-0 :/
2183                 let payloads = vec!(
2184                         msgs::OnionHopData {
2185                                 realm: 0,
2186                                 data: msgs::OnionRealm0HopData {
2187                                         short_channel_id: 0,
2188                                         amt_to_forward: 0,
2189                                         outgoing_cltv_value: 0,
2190                                 },
2191                                 hmac: [0; 32],
2192                         },
2193                         msgs::OnionHopData {
2194                                 realm: 0,
2195                                 data: msgs::OnionRealm0HopData {
2196                                         short_channel_id: 0x0101010101010101,
2197                                         amt_to_forward: 0x0100000001,
2198                                         outgoing_cltv_value: 0,
2199                                 },
2200                                 hmac: [0; 32],
2201                         },
2202                         msgs::OnionHopData {
2203                                 realm: 0,
2204                                 data: msgs::OnionRealm0HopData {
2205                                         short_channel_id: 0x0202020202020202,
2206                                         amt_to_forward: 0x0200000002,
2207                                         outgoing_cltv_value: 0,
2208                                 },
2209                                 hmac: [0; 32],
2210                         },
2211                         msgs::OnionHopData {
2212                                 realm: 0,
2213                                 data: msgs::OnionRealm0HopData {
2214                                         short_channel_id: 0x0303030303030303,
2215                                         amt_to_forward: 0x0300000003,
2216                                         outgoing_cltv_value: 0,
2217                                 },
2218                                 hmac: [0; 32],
2219                         },
2220                         msgs::OnionHopData {
2221                                 realm: 0,
2222                                 data: msgs::OnionRealm0HopData {
2223                                         short_channel_id: 0x0404040404040404,
2224                                         amt_to_forward: 0x0400000004,
2225                                         outgoing_cltv_value: 0,
2226                                 },
2227                                 hmac: [0; 32],
2228                         },
2229                 );
2230
2231                 let packet = ChannelManager::construct_onion_packet(payloads, onion_keys, &[0x42; 32]).unwrap();
2232                 // Just check the final packet encoding, as it includes all the per-hop vectors in it
2233                 // anyway...
2234                 assert_eq!(packet.encode(), hex::decode("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").unwrap());
2235         }
2236
2237         #[test]
2238         fn test_failure_packet_onion() {
2239                 // Returning Errors test vectors from BOLT 4
2240
2241                 let onion_keys = build_test_onion_keys();
2242                 let onion_error = ChannelManager::build_failure_packet(&onion_keys[4].shared_secret, 0x2002, &[0; 0]);
2243                 assert_eq!(onion_error.encode(), hex::decode("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").unwrap());
2244
2245                 let onion_packet_1 = ChannelManager::encrypt_failure_packet(&onion_keys[4].shared_secret, &onion_error.encode()[..]);
2246                 assert_eq!(onion_packet_1.data, hex::decode("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").unwrap());
2247
2248                 let onion_packet_2 = ChannelManager::encrypt_failure_packet(&onion_keys[3].shared_secret, &onion_packet_1.data[..]);
2249                 assert_eq!(onion_packet_2.data, hex::decode("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").unwrap());
2250
2251                 let onion_packet_3 = ChannelManager::encrypt_failure_packet(&onion_keys[2].shared_secret, &onion_packet_2.data[..]);
2252                 assert_eq!(onion_packet_3.data, hex::decode("a5d3e8634cfe78b2307d87c6d90be6fe7855b4f2cc9b1dfb19e92e4b79103f61ff9ac25f412ddfb7466e74f81b3e545563cdd8f5524dae873de61d7bdfccd496af2584930d2b566b4f8d3881f8c043df92224f38cf094cfc09d92655989531524593ec6d6caec1863bdfaa79229b5020acc034cd6deeea1021c50586947b9b8e6faa83b81fbfa6133c0af5d6b07c017f7158fa94f0d206baf12dda6b68f785b773b360fd0497e16cc402d779c8d48d0fa6315536ef0660f3f4e1865f5b38ea49c7da4fd959de4e83ff3ab686f059a45c65ba2af4a6a79166aa0f496bf04d06987b6d2ea205bdb0d347718b9aeff5b61dfff344993a275b79717cd815b6ad4c0beb568c4ac9c36ff1c315ec1119a1993c4b61e6eaa0375e0aaf738ac691abd3263bf937e3").unwrap());
2253
2254                 let onion_packet_4 = ChannelManager::encrypt_failure_packet(&onion_keys[1].shared_secret, &onion_packet_3.data[..]);
2255                 assert_eq!(onion_packet_4.data, hex::decode("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").unwrap());
2256
2257                 let onion_packet_5 = ChannelManager::encrypt_failure_packet(&onion_keys[0].shared_secret, &onion_packet_4.data[..]);
2258                 assert_eq!(onion_packet_5.data, hex::decode("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").unwrap());
2259         }
2260
2261         fn confirm_transaction(chain: &chaininterface::ChainWatchInterfaceUtil, tx: &Transaction, chan_id: u32) {
2262                 assert!(chain.does_match_tx(tx));
2263                 let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2264                 chain.block_connected_checked(&header, 1, &[tx; 1], &[chan_id; 1]);
2265                 for i in 2..100 {
2266                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2267                         chain.block_connected_checked(&header, i, &[tx; 0], &[0; 0]);
2268                 }
2269         }
2270
2271         struct Node {
2272                 chain_monitor: Arc<chaininterface::ChainWatchInterfaceUtil>,
2273                 tx_broadcaster: Arc<test_utils::TestBroadcaster>,
2274                 chan_monitor: Arc<test_utils::TestChannelMonitor>,
2275                 node: Arc<ChannelManager>,
2276                 router: Router,
2277         }
2278
2279         static mut CHAN_COUNT: u32 = 0;
2280         fn create_chan_between_nodes(node_a: &Node, node_b: &Node) -> (msgs::ChannelAnnouncement, msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction) {
2281                 node_a.node.create_channel(node_b.node.get_our_node_id(), 100000, 10001, 42).unwrap();
2282
2283                 let events_1 = node_a.node.get_and_clear_pending_events();
2284                 assert_eq!(events_1.len(), 1);
2285                 let accept_chan = match events_1[0] {
2286                         Event::SendOpenChannel { ref node_id, ref msg } => {
2287                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2288                                 node_b.node.handle_open_channel(&node_a.node.get_our_node_id(), msg).unwrap()
2289                         },
2290                         _ => panic!("Unexpected event"),
2291                 };
2292
2293                 node_a.node.handle_accept_channel(&node_b.node.get_our_node_id(), &accept_chan).unwrap();
2294
2295                 let chan_id = unsafe { CHAN_COUNT };
2296                 let tx;
2297                 let funding_output;
2298
2299                 let events_2 = node_a.node.get_and_clear_pending_events();
2300                 assert_eq!(events_2.len(), 1);
2301                 match events_2[0] {
2302                         Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, user_channel_id } => {
2303                                 assert_eq!(*channel_value_satoshis, 100000);
2304                                 assert_eq!(user_channel_id, 42);
2305
2306                                 tx = Transaction { version: chan_id as u32, lock_time: 0, input: Vec::new(), output: vec![TxOut {
2307                                         value: *channel_value_satoshis, script_pubkey: output_script.clone(),
2308                                 }]};
2309                                 funding_output = OutPoint::new(Sha256dHash::from_data(&serialize(&tx).unwrap()[..]), 0);
2310
2311                                 node_a.node.funding_transaction_generated(&temporary_channel_id, funding_output);
2312                                 let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
2313                                 assert_eq!(added_monitors.len(), 1);
2314                                 assert_eq!(added_monitors[0].0, funding_output);
2315                                 added_monitors.clear();
2316                         },
2317                         _ => panic!("Unexpected event"),
2318                 }
2319
2320                 let events_3 = node_a.node.get_and_clear_pending_events();
2321                 assert_eq!(events_3.len(), 1);
2322                 let funding_signed = match events_3[0] {
2323                         Event::SendFundingCreated { ref node_id, ref msg } => {
2324                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2325                                 let res = node_b.node.handle_funding_created(&node_a.node.get_our_node_id(), msg).unwrap();
2326                                 let mut added_monitors = node_b.chan_monitor.added_monitors.lock().unwrap();
2327                                 assert_eq!(added_monitors.len(), 1);
2328                                 assert_eq!(added_monitors[0].0, funding_output);
2329                                 added_monitors.clear();
2330                                 res
2331                         },
2332                         _ => panic!("Unexpected event"),
2333                 };
2334
2335                 node_a.node.handle_funding_signed(&node_b.node.get_our_node_id(), &funding_signed).unwrap();
2336                 {
2337                         let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
2338                         assert_eq!(added_monitors.len(), 1);
2339                         assert_eq!(added_monitors[0].0, funding_output);
2340                         added_monitors.clear();
2341                 }
2342
2343                 let events_4 = node_a.node.get_and_clear_pending_events();
2344                 assert_eq!(events_4.len(), 1);
2345                 match events_4[0] {
2346                         Event::FundingBroadcastSafe { ref funding_txo, user_channel_id } => {
2347                                 assert_eq!(user_channel_id, 42);
2348                                 assert_eq!(*funding_txo, funding_output);
2349                         },
2350                         _ => panic!("Unexpected event"),
2351                 };
2352
2353                 confirm_transaction(&node_a.chain_monitor, &tx, chan_id);
2354                 let events_5 = node_a.node.get_and_clear_pending_events();
2355                 assert_eq!(events_5.len(), 1);
2356                 match events_5[0] {
2357                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
2358                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2359                                 assert!(announcement_sigs.is_none());
2360                                 node_b.node.handle_funding_locked(&node_a.node.get_our_node_id(), msg).unwrap()
2361                         },
2362                         _ => panic!("Unexpected event"),
2363                 };
2364
2365                 let channel_id;
2366
2367                 confirm_transaction(&node_b.chain_monitor, &tx, chan_id);
2368                 let events_6 = node_b.node.get_and_clear_pending_events();
2369                 assert_eq!(events_6.len(), 1);
2370                 let as_announcement_sigs = match events_6[0] {
2371                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
2372                                 assert_eq!(*node_id, node_a.node.get_our_node_id());
2373                                 channel_id = msg.channel_id.clone();
2374                                 let as_announcement_sigs = node_a.node.handle_funding_locked(&node_b.node.get_our_node_id(), msg).unwrap().unwrap();
2375                                 node_a.node.handle_announcement_signatures(&node_b.node.get_our_node_id(), &(*announcement_sigs).clone().unwrap()).unwrap();
2376                                 as_announcement_sigs
2377                         },
2378                         _ => panic!("Unexpected event"),
2379                 };
2380
2381                 let events_7 = node_a.node.get_and_clear_pending_events();
2382                 assert_eq!(events_7.len(), 1);
2383                 let (announcement, as_update) = match events_7[0] {
2384                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
2385                                 (msg, update_msg)
2386                         },
2387                         _ => panic!("Unexpected event"),
2388                 };
2389
2390                 node_b.node.handle_announcement_signatures(&node_a.node.get_our_node_id(), &as_announcement_sigs).unwrap();
2391                 let events_8 = node_b.node.get_and_clear_pending_events();
2392                 assert_eq!(events_8.len(), 1);
2393                 let bs_update = match events_8[0] {
2394                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
2395                                 assert!(*announcement == *msg);
2396                                 update_msg
2397                         },
2398                         _ => panic!("Unexpected event"),
2399                 };
2400
2401                 unsafe {
2402                         CHAN_COUNT += 1;
2403                 }
2404
2405                 ((*announcement).clone(), (*as_update).clone(), (*bs_update).clone(), channel_id, tx)
2406         }
2407
2408         fn create_announced_chan_between_nodes(nodes: &Vec<Node>, a: usize, b: usize) -> (msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction) {
2409                 let chan_announcement = create_chan_between_nodes(&nodes[a], &nodes[b]);
2410                 for node in nodes {
2411                         assert!(node.router.handle_channel_announcement(&chan_announcement.0).unwrap());
2412                         node.router.handle_channel_update(&chan_announcement.1).unwrap();
2413                         node.router.handle_channel_update(&chan_announcement.2).unwrap();
2414                 }
2415                 (chan_announcement.1, chan_announcement.2, chan_announcement.3, chan_announcement.4)
2416         }
2417
2418         fn close_channel(outbound_node: &Node, inbound_node: &Node, channel_id: &[u8; 32], funding_tx: Transaction, close_inbound_first: bool) -> (msgs::ChannelUpdate, msgs::ChannelUpdate) {
2419                 let (node_a, broadcaster_a) = if close_inbound_first { (&inbound_node.node, &inbound_node.tx_broadcaster) } else { (&outbound_node.node, &outbound_node.tx_broadcaster) };
2420                 let (node_b, broadcaster_b) = if close_inbound_first { (&outbound_node.node, &outbound_node.tx_broadcaster) } else { (&inbound_node.node, &inbound_node.tx_broadcaster) };
2421                 let (tx_a, tx_b);
2422
2423                 node_a.close_channel(channel_id).unwrap();
2424                 let events_1 = node_a.get_and_clear_pending_events();
2425                 assert_eq!(events_1.len(), 1);
2426                 let shutdown_a = match events_1[0] {
2427                         Event::SendShutdown { ref node_id, ref msg } => {
2428                                 assert_eq!(node_id, &node_b.get_our_node_id());
2429                                 msg.clone()
2430                         },
2431                         _ => panic!("Unexpected event"),
2432                 };
2433
2434                 let (shutdown_b, mut closing_signed_b) = node_b.handle_shutdown(&node_a.get_our_node_id(), &shutdown_a).unwrap();
2435                 if !close_inbound_first {
2436                         assert!(closing_signed_b.is_none());
2437                 }
2438                 let (empty_a, mut closing_signed_a) = node_a.handle_shutdown(&node_b.get_our_node_id(), &shutdown_b.unwrap()).unwrap();
2439                 assert!(empty_a.is_none());
2440                 if close_inbound_first {
2441                         assert!(closing_signed_a.is_none());
2442                         closing_signed_a = node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
2443                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
2444                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
2445
2446                         let empty_b = node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
2447                         assert!(empty_b.is_none());
2448                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
2449                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
2450                 } else {
2451                         closing_signed_b = node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
2452                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
2453                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
2454
2455                         let empty_a2 = node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
2456                         assert!(empty_a2.is_none());
2457                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
2458                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
2459                 }
2460                 assert_eq!(tx_a, tx_b);
2461                 let mut funding_tx_map = HashMap::new();
2462                 funding_tx_map.insert(funding_tx.txid(), funding_tx);
2463                 tx_a.verify(&funding_tx_map).unwrap();
2464
2465                 let events_2 = node_a.get_and_clear_pending_events();
2466                 assert_eq!(events_2.len(), 1);
2467                 let as_update = match events_2[0] {
2468                         Event::BroadcastChannelUpdate { ref msg } => {
2469                                 msg.clone()
2470                         },
2471                         _ => panic!("Unexpected event"),
2472                 };
2473
2474                 let events_3 = node_b.get_and_clear_pending_events();
2475                 assert_eq!(events_3.len(), 1);
2476                 let bs_update = match events_3[0] {
2477                         Event::BroadcastChannelUpdate { ref msg } => {
2478                                 msg.clone()
2479                         },
2480                         _ => panic!("Unexpected event"),
2481                 };
2482
2483                 (as_update, bs_update)
2484         }
2485
2486         struct SendEvent {
2487                 node_id: PublicKey,
2488                 msgs: Vec<msgs::UpdateAddHTLC>,
2489                 commitment_msg: msgs::CommitmentSigned,
2490         }
2491         impl SendEvent {
2492                 fn from_event(event: Event) -> SendEvent {
2493                         match event {
2494                                 Event::UpdateHTLCs { node_id, updates: msgs::CommitmentUpdate { update_add_htlcs, update_fulfill_htlcs, update_fail_htlcs, update_fail_malformed_htlcs, commitment_signed } } => {
2495                                         assert!(update_fulfill_htlcs.is_empty());
2496                                         assert!(update_fail_htlcs.is_empty());
2497                                         assert!(update_fail_malformed_htlcs.is_empty());
2498                                         SendEvent { node_id: node_id, msgs: update_add_htlcs, commitment_msg: commitment_signed }
2499                                 },
2500                                 _ => panic!("Unexpected event type!"),
2501                         }
2502                 }
2503         }
2504
2505         static mut PAYMENT_COUNT: u8 = 0;
2506         fn send_along_route(origin_node: &Node, route: Route, expected_route: &[&Node], recv_value: u64) -> ([u8; 32], [u8; 32]) {
2507                 let our_payment_preimage = unsafe { [PAYMENT_COUNT; 32] };
2508                 unsafe { PAYMENT_COUNT += 1 };
2509                 let our_payment_hash = {
2510                         let mut sha = Sha256::new();
2511                         sha.input(&our_payment_preimage[..]);
2512                         let mut ret = [0; 32];
2513                         sha.result(&mut ret);
2514                         ret
2515                 };
2516
2517                 let mut payment_event = {
2518                         origin_node.node.send_payment(route, our_payment_hash).unwrap();
2519                         {
2520                                 let mut added_monitors = origin_node.chan_monitor.added_monitors.lock().unwrap();
2521                                 assert_eq!(added_monitors.len(), 1);
2522                                 added_monitors.clear();
2523                         }
2524
2525                         let mut events = origin_node.node.get_and_clear_pending_events();
2526                         assert_eq!(events.len(), 1);
2527                         SendEvent::from_event(events.remove(0))
2528                 };
2529                 let mut prev_node = origin_node;
2530
2531                 for (idx, &node) in expected_route.iter().enumerate() {
2532                         assert_eq!(node.node.get_our_node_id(), payment_event.node_id);
2533
2534                         node.node.handle_update_add_htlc(&prev_node.node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
2535                         {
2536                                 let added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2537                                 assert_eq!(added_monitors.len(), 0);
2538                         }
2539
2540                         let revoke_and_ack = node.node.handle_commitment_signed(&prev_node.node.get_our_node_id(), &payment_event.commitment_msg).unwrap();
2541                         {
2542                                 let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2543                                 assert_eq!(added_monitors.len(), 1);
2544                                 added_monitors.clear();
2545                         }
2546                         assert!(prev_node.node.handle_revoke_and_ack(&node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2547                         let prev_revoke_and_ack = prev_node.node.handle_commitment_signed(&node.node.get_our_node_id(), &revoke_and_ack.1.unwrap()).unwrap();
2548                         {
2549                                 let mut added_monitors = prev_node.chan_monitor.added_monitors.lock().unwrap();
2550                                 assert_eq!(added_monitors.len(), 2);
2551                                 added_monitors.clear();
2552                         }
2553                         assert!(node.node.handle_revoke_and_ack(&prev_node.node.get_our_node_id(), &prev_revoke_and_ack.0).unwrap().is_none());
2554                         assert!(prev_revoke_and_ack.1.is_none());
2555                         {
2556                                 let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2557                                 assert_eq!(added_monitors.len(), 1);
2558                                 added_monitors.clear();
2559                         }
2560
2561                         let events_1 = node.node.get_and_clear_pending_events();
2562                         assert_eq!(events_1.len(), 1);
2563                         match events_1[0] {
2564                                 Event::PendingHTLCsForwardable { .. } => { },
2565                                 _ => panic!("Unexpected event"),
2566                         };
2567
2568                         node.node.channel_state.lock().unwrap().next_forward = Instant::now();
2569                         node.node.process_pending_htlc_forwards();
2570
2571                         let mut events_2 = node.node.get_and_clear_pending_events();
2572                         assert_eq!(events_2.len(), 1);
2573                         if idx == expected_route.len() - 1 {
2574                                 match events_2[0] {
2575                                         Event::PaymentReceived { ref payment_hash, amt } => {
2576                                                 assert_eq!(our_payment_hash, *payment_hash);
2577                                                 assert_eq!(amt, recv_value);
2578                                         },
2579                                         _ => panic!("Unexpected event"),
2580                                 }
2581                         } else {
2582                                 {
2583                                         let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2584                                         assert_eq!(added_monitors.len(), 1);
2585                                         added_monitors.clear();
2586                                 }
2587                                 payment_event = SendEvent::from_event(events_2.remove(0));
2588                                 assert_eq!(payment_event.msgs.len(), 1);
2589                         }
2590
2591                         prev_node = node;
2592                 }
2593
2594                 (our_payment_preimage, our_payment_hash)
2595         }
2596
2597         fn claim_payment(origin_node: &Node, expected_route: &[&Node], our_payment_preimage: [u8; 32]) {
2598                 assert!(expected_route.last().unwrap().node.claim_funds(our_payment_preimage));
2599                 {
2600                         let mut added_monitors = expected_route.last().unwrap().chan_monitor.added_monitors.lock().unwrap();
2601                         assert_eq!(added_monitors.len(), 1);
2602                         added_monitors.clear();
2603                 }
2604
2605                 let mut next_msgs: Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned)> = None;
2606                 macro_rules! update_fulfill_dance {
2607                         ($node: expr, $prev_node: expr, $last_node: expr) => {
2608                                 {
2609                                         $node.node.handle_update_fulfill_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
2610                                         {
2611                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2612                                                 if $last_node {
2613                                                         assert_eq!(added_monitors.len(), 0);
2614                                                 } else {
2615                                                         assert_eq!(added_monitors.len(), 1);
2616                                                 }
2617                                                 added_monitors.clear();
2618                                         }
2619                                         let revoke_and_commit = $node.node.handle_commitment_signed(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().1).unwrap();
2620                                         {
2621                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2622                                                 assert_eq!(added_monitors.len(), 1);
2623                                                 added_monitors.clear();
2624                                         }
2625                                         assert!($prev_node.node.handle_revoke_and_ack(&$node.node.get_our_node_id(), &revoke_and_commit.0).unwrap().is_none());
2626                                         let revoke_and_ack = $prev_node.node.handle_commitment_signed(&$node.node.get_our_node_id(), &revoke_and_commit.1.unwrap()).unwrap();
2627                                         assert!(revoke_and_ack.1.is_none());
2628                                         {
2629                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2630                                                 assert_eq!(added_monitors.len(), 2);
2631                                                 added_monitors.clear();
2632                                         }
2633                                         assert!($node.node.handle_revoke_and_ack(&$prev_node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2634                                         {
2635                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2636                                                 assert_eq!(added_monitors.len(), 1);
2637                                                 added_monitors.clear();
2638                                         }
2639                                 }
2640                         }
2641                 }
2642
2643                 let mut expected_next_node = expected_route.last().unwrap().node.get_our_node_id();
2644                 let mut prev_node = expected_route.last().unwrap();
2645                 for node in expected_route.iter().rev() {
2646                         assert_eq!(expected_next_node, node.node.get_our_node_id());
2647                         if next_msgs.is_some() {
2648                                 update_fulfill_dance!(node, prev_node, false);
2649                         }
2650
2651                         let events = node.node.get_and_clear_pending_events();
2652                         assert_eq!(events.len(), 1);
2653                         match events[0] {
2654                                 Event::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, ref commitment_signed } } => {
2655                                         assert!(update_add_htlcs.is_empty());
2656                                         assert_eq!(update_fulfill_htlcs.len(), 1);
2657                                         assert!(update_fail_htlcs.is_empty());
2658                                         assert!(update_fail_malformed_htlcs.is_empty());
2659                                         expected_next_node = node_id.clone();
2660                                         next_msgs = Some((update_fulfill_htlcs[0].clone(), commitment_signed.clone()));
2661                                 },
2662                                 _ => panic!("Unexpected event"),
2663                         };
2664
2665                         prev_node = node;
2666                 }
2667
2668                 assert_eq!(expected_next_node, origin_node.node.get_our_node_id());
2669                 update_fulfill_dance!(origin_node, expected_route.first().unwrap(), true);
2670
2671                 let events = origin_node.node.get_and_clear_pending_events();
2672                 assert_eq!(events.len(), 1);
2673                 match events[0] {
2674                         Event::PaymentSent { payment_preimage } => {
2675                                 assert_eq!(payment_preimage, our_payment_preimage);
2676                         },
2677                         _ => panic!("Unexpected event"),
2678                 }
2679         }
2680
2681         const TEST_FINAL_CLTV: u32 = 32;
2682
2683         fn route_payment(origin_node: &Node, expected_route: &[&Node], recv_value: u64) -> ([u8; 32], [u8; 32]) {
2684                 let route = origin_node.router.get_route(&expected_route.last().unwrap().node.get_our_node_id(), None, &Vec::new(), recv_value, TEST_FINAL_CLTV).unwrap();
2685                 assert_eq!(route.hops.len(), expected_route.len());
2686                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
2687                         assert_eq!(hop.pubkey, node.node.get_our_node_id());
2688                 }
2689
2690                 send_along_route(origin_node, route, expected_route, recv_value)
2691         }
2692
2693         fn route_over_limit(origin_node: &Node, expected_route: &[&Node], recv_value: u64) {
2694                 let route = origin_node.router.get_route(&expected_route.last().unwrap().node.get_our_node_id(), None, &Vec::new(), recv_value, TEST_FINAL_CLTV).unwrap();
2695                 assert_eq!(route.hops.len(), expected_route.len());
2696                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
2697                         assert_eq!(hop.pubkey, node.node.get_our_node_id());
2698                 }
2699
2700                 let our_payment_preimage = unsafe { [PAYMENT_COUNT; 32] };
2701                 unsafe { PAYMENT_COUNT += 1 };
2702                 let our_payment_hash = {
2703                         let mut sha = Sha256::new();
2704                         sha.input(&our_payment_preimage[..]);
2705                         let mut ret = [0; 32];
2706                         sha.result(&mut ret);
2707                         ret
2708                 };
2709
2710                 let err = origin_node.node.send_payment(route, our_payment_hash).err().unwrap();
2711                 assert_eq!(err.err, "Cannot send value that would put us over our max HTLC value in flight");
2712         }
2713
2714         fn send_payment(origin: &Node, expected_route: &[&Node], recv_value: u64) {
2715                 let our_payment_preimage = route_payment(&origin, expected_route, recv_value).0;
2716                 claim_payment(&origin, expected_route, our_payment_preimage);
2717         }
2718
2719         fn fail_payment(origin_node: &Node, expected_route: &[&Node], our_payment_hash: [u8; 32]) {
2720                 assert!(expected_route.last().unwrap().node.fail_htlc_backwards(&our_payment_hash));
2721                 {
2722                         let mut added_monitors = expected_route.last().unwrap().chan_monitor.added_monitors.lock().unwrap();
2723                         assert_eq!(added_monitors.len(), 1);
2724                         added_monitors.clear();
2725                 }
2726
2727                 let mut next_msgs: Option<(msgs::UpdateFailHTLC, msgs::CommitmentSigned)> = None;
2728                 macro_rules! update_fail_dance {
2729                         ($node: expr, $prev_node: expr, $last_node: expr) => {
2730                                 {
2731                                         $node.node.handle_update_fail_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
2732                                         let revoke_and_commit = $node.node.handle_commitment_signed(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().1).unwrap();
2733
2734                                         {
2735                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2736                                                 assert_eq!(added_monitors.len(), 1);
2737                                                 added_monitors.clear();
2738                                         }
2739                                         assert!($prev_node.node.handle_revoke_and_ack(&$node.node.get_our_node_id(), &revoke_and_commit.0).unwrap().is_none());
2740                                         {
2741                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2742                                                 assert_eq!(added_monitors.len(), 1);
2743                                                 added_monitors.clear();
2744                                         }
2745                                         let revoke_and_ack = $prev_node.node.handle_commitment_signed(&$node.node.get_our_node_id(), &revoke_and_commit.1.unwrap()).unwrap();
2746                                         {
2747                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2748                                                 assert_eq!(added_monitors.len(), 1);
2749                                                 added_monitors.clear();
2750                                         }
2751                                         assert!(revoke_and_ack.1.is_none());
2752                                         assert!($node.node.get_and_clear_pending_events().is_empty());
2753                                         assert!($node.node.handle_revoke_and_ack(&$prev_node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2754                                         {
2755                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2756                                                 if $last_node {
2757                                                         assert_eq!(added_monitors.len(), 1);
2758                                                 } else {
2759                                                         assert_eq!(added_monitors.len(), 2);
2760                                                         assert!(added_monitors[0].0 != added_monitors[1].0);
2761                                                 }
2762                                                 added_monitors.clear();
2763                                         }
2764                                 }
2765                         }
2766                 }
2767
2768                 let mut expected_next_node = expected_route.last().unwrap().node.get_our_node_id();
2769                 let mut prev_node = expected_route.last().unwrap();
2770                 for node in expected_route.iter().rev() {
2771                         assert_eq!(expected_next_node, node.node.get_our_node_id());
2772                         if next_msgs.is_some() {
2773                                 update_fail_dance!(node, prev_node, false);
2774                         }
2775
2776                         let events = node.node.get_and_clear_pending_events();
2777                         assert_eq!(events.len(), 1);
2778                         match events[0] {
2779                                 Event::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, ref commitment_signed } } => {
2780                                         assert!(update_add_htlcs.is_empty());
2781                                         assert!(update_fulfill_htlcs.is_empty());
2782                                         assert_eq!(update_fail_htlcs.len(), 1);
2783                                         assert!(update_fail_malformed_htlcs.is_empty());
2784                                         expected_next_node = node_id.clone();
2785                                         next_msgs = Some((update_fail_htlcs[0].clone(), commitment_signed.clone()));
2786                                 },
2787                                 _ => panic!("Unexpected event"),
2788                         };
2789
2790                         prev_node = node;
2791                 }
2792
2793                 assert_eq!(expected_next_node, origin_node.node.get_our_node_id());
2794                 update_fail_dance!(origin_node, expected_route.first().unwrap(), true);
2795
2796                 let events = origin_node.node.get_and_clear_pending_events();
2797                 assert_eq!(events.len(), 1);
2798                 match events[0] {
2799                         Event::PaymentFailed { payment_hash } => {
2800                                 assert_eq!(payment_hash, our_payment_hash);
2801                         },
2802                         _ => panic!("Unexpected event"),
2803                 }
2804         }
2805
2806         fn create_network(node_count: usize) -> Vec<Node> {
2807                 let mut nodes = Vec::new();
2808                 let mut rng = thread_rng();
2809                 let secp_ctx = Secp256k1::new();
2810                 let logger: Arc<Logger> = Arc::new(test_utils::TestLogger::new());
2811
2812                 for _ in 0..node_count {
2813                         let feeest = Arc::new(test_utils::TestFeeEstimator { sat_per_kw: 253 });
2814                         let chain_monitor = Arc::new(chaininterface::ChainWatchInterfaceUtil::new(Arc::clone(&logger)));
2815                         let tx_broadcaster = Arc::new(test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new())});
2816                         let chan_monitor = Arc::new(test_utils::TestChannelMonitor::new(chain_monitor.clone(), tx_broadcaster.clone()));
2817                         let node_id = {
2818                                 let mut key_slice = [0; 32];
2819                                 rng.fill_bytes(&mut key_slice);
2820                                 SecretKey::from_slice(&secp_ctx, &key_slice).unwrap()
2821                         };
2822                         let node = ChannelManager::new(node_id.clone(), 0, true, Network::Testnet, feeest.clone(), chan_monitor.clone(), chain_monitor.clone(), tx_broadcaster.clone(), Arc::clone(&logger)).unwrap();
2823                         let router = Router::new(PublicKey::from_secret_key(&secp_ctx, &node_id), Arc::clone(&logger));
2824                         nodes.push(Node { chain_monitor, tx_broadcaster, chan_monitor, node, router });
2825                 }
2826
2827                 nodes
2828         }
2829
2830         #[test]
2831         fn fake_network_test() {
2832                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
2833                 // tests that payments get routed and transactions broadcast in semi-reasonable ways.
2834                 let nodes = create_network(4);
2835
2836                 // Create some initial channels
2837                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
2838                 let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2);
2839                 let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3);
2840
2841                 // Rebalance the network a bit by relaying one payment through all the channels...
2842                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2843                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2844                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2845                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2846
2847                 // Send some more payments
2848                 send_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 1000000);
2849                 send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1], &nodes[0])[..], 1000000);
2850                 send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1])[..], 1000000);
2851
2852                 // Test failure packets
2853                 let payment_hash_1 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 1000000).1;
2854                 fail_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], payment_hash_1);
2855
2856                 // Add a new channel that skips 3
2857                 let chan_4 = create_announced_chan_between_nodes(&nodes, 1, 3);
2858
2859                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 1000000);
2860                 send_payment(&nodes[2], &vec!(&nodes[3])[..], 1000000);
2861                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2862                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2863                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2864                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2865                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2866
2867                 // Do some rebalance loop payments, simultaneously
2868                 let mut hops = Vec::with_capacity(3);
2869                 hops.push(RouteHop {
2870                         pubkey: nodes[2].node.get_our_node_id(),
2871                         short_channel_id: chan_2.0.contents.short_channel_id,
2872                         fee_msat: 0,
2873                         cltv_expiry_delta: chan_3.0.contents.cltv_expiry_delta as u32
2874                 });
2875                 hops.push(RouteHop {
2876                         pubkey: nodes[3].node.get_our_node_id(),
2877                         short_channel_id: chan_3.0.contents.short_channel_id,
2878                         fee_msat: 0,
2879                         cltv_expiry_delta: chan_4.1.contents.cltv_expiry_delta as u32
2880                 });
2881                 hops.push(RouteHop {
2882                         pubkey: nodes[1].node.get_our_node_id(),
2883                         short_channel_id: chan_4.0.contents.short_channel_id,
2884                         fee_msat: 1000000,
2885                         cltv_expiry_delta: TEST_FINAL_CLTV,
2886                 });
2887                 hops[1].fee_msat = chan_4.1.contents.fee_base_msat as u64 + chan_4.1.contents.fee_proportional_millionths as u64 * hops[2].fee_msat as u64 / 1000000;
2888                 hops[0].fee_msat = chan_3.0.contents.fee_base_msat as u64 + chan_3.0.contents.fee_proportional_millionths as u64 * hops[1].fee_msat as u64 / 1000000;
2889                 let payment_preimage_1 = send_along_route(&nodes[1], Route { hops }, &vec!(&nodes[2], &nodes[3], &nodes[1])[..], 1000000).0;
2890
2891                 let mut hops = Vec::with_capacity(3);
2892                 hops.push(RouteHop {
2893                         pubkey: nodes[3].node.get_our_node_id(),
2894                         short_channel_id: chan_4.0.contents.short_channel_id,
2895                         fee_msat: 0,
2896                         cltv_expiry_delta: chan_3.1.contents.cltv_expiry_delta as u32
2897                 });
2898                 hops.push(RouteHop {
2899                         pubkey: nodes[2].node.get_our_node_id(),
2900                         short_channel_id: chan_3.0.contents.short_channel_id,
2901                         fee_msat: 0,
2902                         cltv_expiry_delta: chan_2.1.contents.cltv_expiry_delta as u32
2903                 });
2904                 hops.push(RouteHop {
2905                         pubkey: nodes[1].node.get_our_node_id(),
2906                         short_channel_id: chan_2.0.contents.short_channel_id,
2907                         fee_msat: 1000000,
2908                         cltv_expiry_delta: TEST_FINAL_CLTV,
2909                 });
2910                 hops[1].fee_msat = chan_2.1.contents.fee_base_msat as u64 + chan_2.1.contents.fee_proportional_millionths as u64 * hops[2].fee_msat as u64 / 1000000;
2911                 hops[0].fee_msat = chan_3.1.contents.fee_base_msat as u64 + chan_3.1.contents.fee_proportional_millionths as u64 * hops[1].fee_msat as u64 / 1000000;
2912                 let payment_hash_2 = send_along_route(&nodes[1], Route { hops }, &vec!(&nodes[3], &nodes[2], &nodes[1])[..], 1000000).1;
2913
2914                 // Claim the rebalances...
2915                 fail_payment(&nodes[1], &vec!(&nodes[3], &nodes[2], &nodes[1])[..], payment_hash_2);
2916                 claim_payment(&nodes[1], &vec!(&nodes[2], &nodes[3], &nodes[1])[..], payment_preimage_1);
2917
2918                 // Add a duplicate new channel from 2 to 4
2919                 let chan_5 = create_announced_chan_between_nodes(&nodes, 1, 3);
2920
2921                 // Send some payments across both channels
2922                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2923                 let payment_preimage_4 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2924                 let payment_preimage_5 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2925
2926                 route_over_limit(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000);
2927
2928                 //TODO: Test that routes work again here as we've been notified that the channel is full
2929
2930                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_3);
2931                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_4);
2932                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_5);
2933
2934                 // Close down the channels...
2935                 close_channel(&nodes[0], &nodes[1], &chan_1.2, chan_1.3, true);
2936                 close_channel(&nodes[1], &nodes[2], &chan_2.2, chan_2.3, false);
2937                 close_channel(&nodes[2], &nodes[3], &chan_3.2, chan_3.3, true);
2938                 close_channel(&nodes[1], &nodes[3], &chan_4.2, chan_4.3, false);
2939                 close_channel(&nodes[1], &nodes[3], &chan_5.2, chan_5.3, false);
2940
2941                 // Check that we processed all pending events
2942                 for node in nodes {
2943                         assert_eq!(node.node.get_and_clear_pending_events().len(), 0);
2944                         assert_eq!(node.chan_monitor.added_monitors.lock().unwrap().len(), 0);
2945                 }
2946         }
2947
2948         #[derive(PartialEq)]
2949         enum HTLCType { NONE, TIMEOUT, SUCCESS }
2950         fn test_txn_broadcast(node: &Node, chan: &(msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction), commitment_tx: Option<Transaction>, has_htlc_tx: HTLCType) -> Vec<Transaction> {
2951                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
2952                 assert!(node_txn.len() >= if commitment_tx.is_some() { 0 } else { 1 } + if has_htlc_tx == HTLCType::NONE { 0 } else { 1 });
2953
2954                 let mut res = Vec::with_capacity(2);
2955
2956                 if let Some(explicit_tx) = commitment_tx {
2957                         res.push(explicit_tx.clone());
2958                 } else {
2959                         for tx in node_txn.iter() {
2960                                 if tx.input.len() == 1 && tx.input[0].previous_output.txid == chan.3.txid() {
2961                                         let mut funding_tx_map = HashMap::new();
2962                                         funding_tx_map.insert(chan.3.txid(), chan.3.clone());
2963                                         tx.verify(&funding_tx_map).unwrap();
2964                                         res.push(tx.clone());
2965                                 }
2966                         }
2967                 }
2968                 assert_eq!(res.len(), 1);
2969
2970                 if has_htlc_tx != HTLCType::NONE {
2971                         for tx in node_txn.iter() {
2972                                 if tx.input.len() == 1 && tx.input[0].previous_output.txid == res[0].txid() {
2973                                         let mut funding_tx_map = HashMap::new();
2974                                         funding_tx_map.insert(res[0].txid(), res[0].clone());
2975                                         tx.verify(&funding_tx_map).unwrap();
2976                                         if has_htlc_tx == HTLCType::TIMEOUT {
2977                                                 assert!(tx.lock_time != 0);
2978                                         } else {
2979                                                 assert!(tx.lock_time == 0);
2980                                         }
2981                                         res.push(tx.clone());
2982                                         break;
2983                                 }
2984                         }
2985                         assert_eq!(res.len(), 2);
2986                 }
2987                 node_txn.clear();
2988                 res
2989         }
2990
2991         fn check_preimage_claim(node: &Node, prev_txn: &Vec<Transaction>) -> Vec<Transaction> {
2992                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
2993
2994                 assert!(node_txn.len() >= 1);
2995                 assert_eq!(node_txn[0].input.len(), 1);
2996                 let mut found_prev = false;
2997
2998                 for tx in prev_txn {
2999                         if node_txn[0].input[0].previous_output.txid == tx.txid() {
3000                                 let mut funding_tx_map = HashMap::new();
3001                                 funding_tx_map.insert(tx.txid(), tx.clone());
3002                                 node_txn[0].verify(&funding_tx_map).unwrap();
3003
3004                                 assert!(node_txn[0].input[0].witness[2].len() > 106); // must spend an htlc output
3005                                 assert_eq!(tx.input.len(), 1); // must spend a commitment tx
3006
3007                                 found_prev = true;
3008                                 break;
3009                         }
3010                 }
3011                 assert!(found_prev);
3012
3013                 let mut res = Vec::new();
3014                 mem::swap(&mut *node_txn, &mut res);
3015                 res
3016         }
3017
3018         fn get_announce_close_broadcast_events(nodes: &Vec<Node>, a: usize, b: usize) {
3019                 let events_1 = nodes[a].node.get_and_clear_pending_events();
3020                 assert_eq!(events_1.len(), 1);
3021                 let as_update = match events_1[0] {
3022                         Event::BroadcastChannelUpdate { ref msg } => {
3023                                 msg.clone()
3024                         },
3025                         _ => panic!("Unexpected event"),
3026                 };
3027
3028                 let events_2 = nodes[b].node.get_and_clear_pending_events();
3029                 assert_eq!(events_2.len(), 1);
3030                 let bs_update = match events_2[0] {
3031                         Event::BroadcastChannelUpdate { ref msg } => {
3032                                 msg.clone()
3033                         },
3034                         _ => panic!("Unexpected event"),
3035                 };
3036
3037                 for node in nodes {
3038                         node.router.handle_channel_update(&as_update).unwrap();
3039                         node.router.handle_channel_update(&bs_update).unwrap();
3040                 }
3041         }
3042
3043         #[test]
3044         fn channel_monitor_network_test() {
3045                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
3046                 // tests that ChannelMonitor is able to recover from various states.
3047                 let nodes = create_network(5);
3048
3049                 // Create some initial channels
3050                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
3051                 let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2);
3052                 let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3);
3053                 let chan_4 = create_announced_chan_between_nodes(&nodes, 3, 4);
3054
3055                 // Rebalance the network a bit by relaying one payment through all the channels...
3056                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
3057                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
3058                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
3059                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
3060
3061                 // Simple case with no pending HTLCs:
3062                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), true);
3063                 {
3064                         let mut node_txn = test_txn_broadcast(&nodes[1], &chan_1, None, HTLCType::NONE);
3065                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3066                         nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn.drain(..).next().unwrap()] }, 1);
3067                         test_txn_broadcast(&nodes[0], &chan_1, None, HTLCType::NONE);
3068                 }
3069                 get_announce_close_broadcast_events(&nodes, 0, 1);
3070                 assert_eq!(nodes[0].node.list_channels().len(), 0);
3071                 assert_eq!(nodes[1].node.list_channels().len(), 1);
3072
3073                 // One pending HTLC is discarded by the force-close:
3074                 let payment_preimage_1 = route_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 3000000).0;
3075
3076                 // Simple case of one pending HTLC to HTLC-Timeout
3077                 nodes[1].node.peer_disconnected(&nodes[2].node.get_our_node_id(), true);
3078                 {
3079                         let mut node_txn = test_txn_broadcast(&nodes[1], &chan_2, None, HTLCType::TIMEOUT);
3080                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3081                         nodes[2].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn.drain(..).next().unwrap()] }, 1);
3082                         test_txn_broadcast(&nodes[2], &chan_2, None, HTLCType::NONE);
3083                 }
3084                 get_announce_close_broadcast_events(&nodes, 1, 2);
3085                 assert_eq!(nodes[1].node.list_channels().len(), 0);
3086                 assert_eq!(nodes[2].node.list_channels().len(), 1);
3087
3088                 macro_rules! claim_funds {
3089                         ($node: expr, $prev_node: expr, $preimage: expr) => {
3090                                 {
3091                                         assert!($node.node.claim_funds($preimage));
3092                                         {
3093                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
3094                                                 assert_eq!(added_monitors.len(), 1);
3095                                                 added_monitors.clear();
3096                                         }
3097
3098                                         let events = $node.node.get_and_clear_pending_events();
3099                                         assert_eq!(events.len(), 1);
3100                                         match events[0] {
3101                                                 Event::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fail_htlcs, .. } } => {
3102                                                         assert!(update_add_htlcs.is_empty());
3103                                                         assert!(update_fail_htlcs.is_empty());
3104                                                         assert_eq!(*node_id, $prev_node.node.get_our_node_id());
3105                                                 },
3106                                                 _ => panic!("Unexpected event"),
3107                                         };
3108                                 }
3109                         }
3110                 }
3111
3112                 // nodes[3] gets the preimage, but nodes[2] already disconnected, resulting in a nodes[2]
3113                 // HTLC-Timeout and a nodes[3] claim against it (+ its own announces)
3114                 nodes[2].node.peer_disconnected(&nodes[3].node.get_our_node_id(), true);
3115                 {
3116                         let node_txn = test_txn_broadcast(&nodes[2], &chan_3, None, HTLCType::TIMEOUT);
3117
3118                         // Claim the payment on nodes[3], giving it knowledge of the preimage
3119                         claim_funds!(nodes[3], nodes[2], payment_preimage_1);
3120
3121                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3122                         nodes[3].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[0].clone()] }, 1);
3123
3124                         check_preimage_claim(&nodes[3], &node_txn);
3125                 }
3126                 get_announce_close_broadcast_events(&nodes, 2, 3);
3127                 assert_eq!(nodes[2].node.list_channels().len(), 0);
3128                 assert_eq!(nodes[3].node.list_channels().len(), 1);
3129
3130                 // One pending HTLC to time out:
3131                 let payment_preimage_2 = route_payment(&nodes[3], &vec!(&nodes[4])[..], 3000000).0;
3132
3133                 {
3134                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3135                         nodes[3].chain_monitor.block_connected_checked(&header, 1, &Vec::new()[..], &[0; 0]);
3136                         for i in 2..TEST_FINAL_CLTV - 3 {
3137                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3138                                 nodes[3].chain_monitor.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
3139                         }
3140
3141                         let node_txn = test_txn_broadcast(&nodes[3], &chan_4, None, HTLCType::TIMEOUT);
3142
3143                         // Claim the payment on nodes[3], giving it knowledge of the preimage
3144                         claim_funds!(nodes[4], nodes[3], payment_preimage_2);
3145
3146                         header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3147                         nodes[4].chain_monitor.block_connected_checked(&header, 1, &Vec::new()[..], &[0; 0]);
3148                         for i in 2..TEST_FINAL_CLTV - 3 {
3149                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3150                                 nodes[4].chain_monitor.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
3151                         }
3152
3153                         test_txn_broadcast(&nodes[4], &chan_4, None, HTLCType::SUCCESS);
3154
3155                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3156                         nodes[4].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[0].clone()] }, TEST_FINAL_CLTV - 5);
3157
3158                         check_preimage_claim(&nodes[4], &node_txn);
3159                 }
3160                 get_announce_close_broadcast_events(&nodes, 3, 4);
3161                 assert_eq!(nodes[3].node.list_channels().len(), 0);
3162                 assert_eq!(nodes[4].node.list_channels().len(), 0);
3163
3164                 // Create some new channels:
3165                 let chan_5 = create_announced_chan_between_nodes(&nodes, 0, 1);
3166
3167                 // A pending HTLC which will be revoked:
3168                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
3169                 // Get the will-be-revoked local txn from nodes[0]
3170                 let revoked_local_txn = nodes[0].node.channel_state.lock().unwrap().by_id.iter().next().unwrap().1.last_local_commitment_txn.clone();
3171                 // Revoke the old state
3172                 claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage_3);
3173
3174                 {
3175                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3176                         nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
3177                         {
3178                                 let mut node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
3179                                 assert_eq!(node_txn.len(), 2);
3180                                 assert_eq!(node_txn[0].input.len(), 1);
3181
3182                                 let mut funding_tx_map = HashMap::new();
3183                                 funding_tx_map.insert(revoked_local_txn[0].txid(), revoked_local_txn[0].clone());
3184                                 node_txn[0].verify(&funding_tx_map).unwrap();
3185                                 node_txn.swap_remove(0);
3186                         }
3187                         test_txn_broadcast(&nodes[1], &chan_5, None, HTLCType::NONE);
3188
3189                         nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
3190                         let node_txn = test_txn_broadcast(&nodes[0], &chan_5, Some(revoked_local_txn[0].clone()), HTLCType::TIMEOUT);
3191                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3192                         nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[1].clone()] }, 1);
3193
3194                         //TODO: At this point nodes[1] should claim the revoked HTLC-Timeout output, but that's
3195                         //not yet implemented in ChannelMonitor
3196                 }
3197                 get_announce_close_broadcast_events(&nodes, 0, 1);
3198                 assert_eq!(nodes[0].node.list_channels().len(), 0);
3199                 assert_eq!(nodes[1].node.list_channels().len(), 0);
3200
3201                 // Check that we processed all pending events
3202                 for node in nodes {
3203                         assert_eq!(node.node.get_and_clear_pending_events().len(), 0);
3204                         assert_eq!(node.chan_monitor.added_monitors.lock().unwrap().len(), 0);
3205                 }
3206         }
3207
3208         #[test]
3209         fn test_unconf_chan() {
3210                 // After creating a chan between nodes, we disconnect all blocks previously seen to force a channel close on nodes[0] side
3211                 let nodes = create_network(2);
3212                 create_announced_chan_between_nodes(&nodes, 0, 1);
3213
3214                 let channel_state = nodes[0].node.channel_state.lock().unwrap();
3215                 assert_eq!(channel_state.by_id.len(), 1);
3216                 assert_eq!(channel_state.short_to_id.len(), 1);
3217                 mem::drop(channel_state);
3218
3219                 let mut headers = Vec::new();
3220                 let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3221                 headers.push(header.clone());
3222                 for _i in 2..100 {
3223                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3224                         headers.push(header.clone());
3225                 }
3226                 while !headers.is_empty() {
3227                         nodes[0].node.block_disconnected(&headers.pop().unwrap());
3228                 }
3229                 let channel_state = nodes[0].node.channel_state.lock().unwrap();
3230                 assert_eq!(channel_state.by_id.len(), 0);
3231                 assert_eq!(channel_state.short_to_id.len(), 0);
3232         }
3233 }