_ 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
  23 use crypto;
  24 use crypto::mac::{Mac,MacResult};
  25 use crypto::hmac::Hmac;
  26 use crypto::digest::Digest;
  27 use crypto::symmetriccipher::SynchronousStreamCipher;
  28 use crypto::chacha20::ChaCha20;
  29
  30 use std::{ptr, mem};
  31 use std::collections::HashMap;
  32 use std::collections::hash_map;
  33 use std::sync::{Mutex,MutexGuard,Arc};
  34 use std::sync::atomic::{AtomicUsize, Ordering};
  35 use std::time::{Instant,Duration};
  36
  37 mod channel_held_info {
  38         use ln::msgs;
  39
  40         /// Stores the info we will need to send when we want to forward an HTLC onwards
  41         pub struct PendingForwardHTLCInfo {
  42                 pub(super) onion_packet: Option<msgs::OnionPacket>,
  43                 pub(super) payment_hash: [u8; 32],
  44                 pub(super) short_channel_id: u64,
  45                 pub(super) prev_short_channel_id: u64,
  46                 pub(super) amt_to_forward: u64,
  47                 pub(super) outgoing_cltv_value: u32,
  48         }
  49
  50         #[cfg(feature = "fuzztarget")]
  51         impl PendingForwardHTLCInfo {
  52                 pub fn dummy() -> Self {
  53                         Self {
  54                                 onion_packet: None,
  55                                 payment_hash: [0; 32],
  56                                 short_channel_id: 0,
  57                                 prev_short_channel_id: 0,
  58                                 amt_to_forward: 0,
  59                                 outgoing_cltv_value: 0,
  60                         }
  61                 }
  62         }
  63
  64         #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
  65         pub enum HTLCFailReason {
  66                 ErrorPacket {
  67                         err: msgs::OnionErrorPacket,
  68                 },
  69                 Reason {
  70                         failure_code: u16,
  71                         data: Vec<u8>,
  72                 }
  73         }
  74
  75         #[cfg(feature = "fuzztarget")]
  76         impl HTLCFailReason {
  77                 pub fn dummy() -> Self {
  78                         HTLCFailReason::Reason {
  79                                 failure_code: 0, data: Vec::new(),
  80                         }
  81                 }
  82         }
  83 }
  84 #[cfg(feature = "fuzztarget")]
  85 pub use self::channel_held_info::*;
  86 #[cfg(not(feature = "fuzztarget"))]
  87 pub(crate) use self::channel_held_info::*;
  88
  89 enum PendingOutboundHTLC {
  90         IntermediaryHopData {
  91                 source_short_channel_id: u64,
  92                 incoming_packet_shared_secret: SharedSecret,
  93         },
  94         OutboundRoute {
  95                 route: Route,
  96                 session_priv: SecretKey,
  97         },
  98         /// Used for channel rebalancing
  99         CycledRoute {
 100                 source_short_channel_id: u64,
 101                 incoming_packet_shared_secret: SharedSecret,
 102                 route: Route,
 103                 session_priv: SecretKey,
 104         }
 105 }
 106
 107 /// We hold back HTLCs we intend to relay for a random interval in the range (this, 5*this). This
 108 /// provides some limited amount of privacy. Ideally this would range from somewhere like 1 second
 109 /// to 30 seconds, but people expect lightning to be, you know, kinda fast, sadly. We could
 110 /// probably increase this significantly.
 111 const MIN_HTLC_RELAY_HOLDING_CELL_MILLIS: u32 = 50;
 112
 113 struct ChannelHolder {
 114         by_id: HashMap<[u8; 32], Channel>,
 115         short_to_id: HashMap<u64, [u8; 32]>,
 116         next_forward: Instant,
 117         /// short channel id -> forward infos. Key of 0 means payments received
 118         /// Note that while this is held in the same mutex as the channels themselves, no consistency
 119         /// guarantees are made about there existing a channel with the short id here, nor the short
 120         /// ids in the PendingForwardHTLCInfo!
 121         forward_htlcs: HashMap<u64, Vec<PendingForwardHTLCInfo>>,
 122         /// Note that while this is held in the same mutex as the channels themselves, no consistency
 123         /// guarantees are made about the channels given here actually existing anymore by the time you
 124         /// go to read them!
 125         claimable_htlcs: HashMap<[u8; 32], PendingOutboundHTLC>,
 126 }
 127 struct MutChannelHolder<'a> {
 128         by_id: &'a mut HashMap<[u8; 32], Channel>,
 129         short_to_id: &'a mut HashMap<u64, [u8; 32]>,
 130         next_forward: &'a mut Instant,
 131         forward_htlcs: &'a mut HashMap<u64, Vec<PendingForwardHTLCInfo>>,
 132         claimable_htlcs: &'a mut HashMap<[u8; 32], PendingOutboundHTLC>,
 133 }
 134 impl ChannelHolder {
 135         fn borrow_parts(&mut self) -> MutChannelHolder {
 136                 MutChannelHolder {
 137                         by_id: &mut self.by_id,
 138                         short_to_id: &mut self.short_to_id,
 139                         next_forward: &mut self.next_forward,
 140                         forward_htlcs: &mut self.forward_htlcs,
 141                         claimable_htlcs: &mut self.claimable_htlcs,
 142                 }
 143         }
 144 }
 145
 146 #[cfg(not(any(target_pointer_width = "32", target_pointer_width = "64")))]
 147 const ERR: () = "You need at least 32 bit pointers (well, usize, but we'll assume they're the same) for ChannelManager::latest_block_height";
 148
 149 /// Manager which keeps track of a number of channels and sends messages to the appropriate
 150 /// channel, also tracking HTLC preimages and forwarding onion packets appropriately.
 151 /// Implements ChannelMessageHandler, handling the multi-channel parts and passing things through
 152 /// to individual Channels.
 153 pub struct ChannelManager {
 154         genesis_hash: Sha256dHash,
 155         fee_estimator: Arc<FeeEstimator>,
 156         monitor: Arc<ManyChannelMonitor>,
 157         chain_monitor: Arc<ChainWatchInterface>,
 158         tx_broadcaster: Arc<BroadcasterInterface>,
 159
 160         announce_channels_publicly: bool,
 161         fee_proportional_millionths: u32,
 162         latest_block_height: AtomicUsize,
 163         secp_ctx: Secp256k1,
 164
 165         channel_state: Mutex<ChannelHolder>,
 166         our_network_key: SecretKey,
 167
 168         pending_events: Mutex<Vec<events::Event>>,
 169 }
 170
 171 const CLTV_EXPIRY_DELTA: u16 = 6 * 24 * 2; //TODO?
 172
 173 macro_rules! secp_call {
 174         ( $res : expr ) => {
 175                 match $res {
 176                         Ok(key) => key,
 177                         //TODO: Make the err a parameter!
 178                         Err(_) => return Err(HandleError{err: "Key error", action: None})
 179                 }
 180         };
 181 }
 182
 183 struct OnionKeys {
 184         #[cfg(test)]
 185         shared_secret: SharedSecret,
 186         #[cfg(test)]
 187         blinding_factor: [u8; 32],
 188         ephemeral_pubkey: PublicKey,
 189         rho: [u8; 32],
 190         mu: [u8; 32],
 191 }
 192
 193 pub struct ChannelDetails {
 194         /// The channel's ID (prior to funding transaction generation, this is a random 32 bytes,
 195         /// thereafter this is the txid of the funding transaction xor the funding transaction output).
 196         /// Note that this means this value is *not* persistent - it can change once during the
 197         /// lifetime of the channel.
 198         pub channel_id: [u8; 32],
 199         /// The position of the funding transaction in the chain. None if the funding transaction has
 200         /// not yet been confirmed and the channel fully opened.
 201         pub short_channel_id: Option<u64>,
 202         pub remote_network_id: PublicKey,
 203         pub channel_value_satoshis: u64,
 204         /// The user_id passed in to create_channel, or 0 if the channel was inbound.
 205         pub user_id: u64,
 206 }
 207
 208 impl ChannelManager {
 209         /// Constructs a new ChannelManager to hold several channels and route between them. This is
 210         /// the main "logic hub" for all channel-related actions, and implements ChannelMessageHandler.
 211         /// fee_proportional_millionths is an optional fee to charge any payments routed through us.
 212         /// Non-proportional fees are fixed according to our risk using the provided fee estimator.
 213         /// panics if channel_value_satoshis is >= `MAX_FUNDING_SATOSHIS`!
 214         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>) -> Result<Arc<ChannelManager>, secp256k1::Error> {
 215                 let secp_ctx = Secp256k1::new();
 216
 217                 let res = Arc::new(ChannelManager {
 218                         genesis_hash: genesis_block(network).header.bitcoin_hash(),
 219                         fee_estimator: feeest.clone(),
 220                         monitor: monitor.clone(),
 221                         chain_monitor,
 222                         tx_broadcaster,
 223
 224                         announce_channels_publicly,
 225                         fee_proportional_millionths,
 226                         latest_block_height: AtomicUsize::new(0), //TODO: Get an init value (generally need to replay recent chain on chain_monitor registration)
 227                         secp_ctx,
 228
 229                         channel_state: Mutex::new(ChannelHolder{
 230                                 by_id: HashMap::new(),
 231                                 short_to_id: HashMap::new(),
 232                                 next_forward: Instant::now(),
 233                                 forward_htlcs: HashMap::new(),
 234                                 claimable_htlcs: HashMap::new(),
 235                         }),
 236                         our_network_key,
 237
 238                         pending_events: Mutex::new(Vec::new()),
 239                 });
 240                 let weak_res = Arc::downgrade(&res);
 241                 res.chain_monitor.register_listener(weak_res);
 242                 Ok(res)
 243         }
 244
 245         /// Creates a new outbound channel to the given remote node and with the given value.
 246         /// user_id will be provided back as user_channel_id in FundingGenerationReady and
 247         /// FundingBroadcastSafe events to allow tracking of which events correspond with which
 248         /// create_channel call. Note that user_channel_id defaults to 0 for inbound channels, so you
 249         /// may wish to avoid using 0 for user_id here.
 250         /// If successful, will generate a SendOpenChannel event, so you should probably poll
 251         /// PeerManager::process_events afterwards.
 252         pub fn create_channel(&self, their_network_key: PublicKey, channel_value_satoshis: u64, user_id: u64) -> Result<(), HandleError> {
 253                 let chan_keys = if cfg!(feature = "fuzztarget") {
 254                         ChannelKeys {
 255                                 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(),
 256                                 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(),
 257                                 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(),
 258                                 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(),
 259                                 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(),
 260                                 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(),
 261                                 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(),
 262                                 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],
 263                         }
 264                 } else {
 265                         let mut key_seed = [0u8; 32];
 266                         rng::fill_bytes(&mut key_seed);
 267                         match ChannelKeys::new_from_seed(&key_seed) {
 268                                 Ok(key) => key,
 269                                 Err(_) => panic!("RNG is busted!")
 270                         }
 271                 };
 272
 273                 let channel = Channel::new_outbound(&*self.fee_estimator, chan_keys, their_network_key, channel_value_satoshis, self.announce_channels_publicly, user_id);
 274                 let res = channel.get_open_channel(self.genesis_hash.clone(), &*self.fee_estimator)?;
 275                 let mut channel_state = self.channel_state.lock().unwrap();
 276                 match channel_state.by_id.insert(channel.channel_id(), channel) {
 277                         Some(_) => panic!("RNG is bad???"),
 278                         None => {}
 279                 }
 280
 281                 let mut events = self.pending_events.lock().unwrap();
 282                 events.push(events::Event::SendOpenChannel {
 283                         node_id: their_network_key,
 284                         msg: res,
 285                 });
 286                 Ok(())
 287         }
 288
 289         /// Gets the list of open channels, in random order. See ChannelDetail field documentation for
 290         /// more information.
 291         pub fn list_channels(&self) -> Vec<ChannelDetails> {
 292                 let channel_state = self.channel_state.lock().unwrap();
 293                 let mut res = Vec::with_capacity(channel_state.by_id.len());
 294                 for (channel_id, channel) in channel_state.by_id.iter() {
 295                         res.push(ChannelDetails {
 296                                 channel_id: (*channel_id).clone(),
 297                                 short_channel_id: channel.get_short_channel_id(),
 298                                 remote_network_id: channel.get_their_node_id(),
 299                                 channel_value_satoshis: channel.get_value_satoshis(),
 300                                 user_id: channel.get_user_id(),
 301                         });
 302                 }
 303                 res
 304         }
 305
 306         /// Gets the list of usable channels, in random order. Useful as an argument to
 307         /// Router::get_route to ensure non-announced channels are used.
 308         pub fn list_usable_channels(&self) -> Vec<ChannelDetails> {
 309                 let channel_state = self.channel_state.lock().unwrap();
 310                 let mut res = Vec::with_capacity(channel_state.by_id.len());
 311                 for (channel_id, channel) in channel_state.by_id.iter() {
 312                         if channel.is_usable() {
 313                                 res.push(ChannelDetails {
 314                                         channel_id: (*channel_id).clone(),
 315                                         short_channel_id: channel.get_short_channel_id(),
 316                                         remote_network_id: channel.get_their_node_id(),
 317                                         channel_value_satoshis: channel.get_value_satoshis(),
 318                                         user_id: channel.get_user_id(),
 319                                 });
 320                         }
 321                 }
 322                 res
 323         }
 324
 325         /// Begins the process of closing a channel. After this call (plus some timeout), no new HTLCs
 326         /// will be accepted on the given channel, and after additional timeout/the closing of all
 327         /// pending HTLCs, the channel will be closed on chain.
 328         /// May generate a SendShutdown event on success, which should be relayed.
 329         pub fn close_channel(&self, channel_id: &[u8; 32]) -> Result<(), HandleError> {
 330                 let (res, node_id, chan_option) = {
 331                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 332                         let channel_state = channel_state_lock.borrow_parts();
 333                         match channel_state.by_id.entry(channel_id.clone()) {
 334                                 hash_map::Entry::Occupied(mut chan_entry) => {
 335                                         let res = chan_entry.get_mut().get_shutdown()?;
 336                                         if chan_entry.get().is_shutdown() {
 337                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
 338                                                         channel_state.short_to_id.remove(&short_id);
 339                                                 }
 340                                                 (res, chan_entry.get().get_their_node_id(), Some(chan_entry.remove_entry().1))
 341                                         } else { (res, chan_entry.get().get_their_node_id(), None) }
 342                                 },
 343                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "No such channel", action: None})
 344                         }
 345                 };
 346                 for payment_hash in res.1 {
 347                         // unknown_next_peer...I dunno who that is anymore....
 348                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
 349                 }
 350                 let chan_update = if let Some(chan) = chan_option {
 351                         if let Ok(update) = self.get_channel_update(&chan) {
 352                                 Some(update)
 353                         } else { None }
 354                 } else { None };
 355
 356                 let mut events = self.pending_events.lock().unwrap();
 357                 if let Some(update) = chan_update {
 358                         events.push(events::Event::BroadcastChannelUpdate {
 359                                 msg: update
 360                         });
 361                 }
 362                 events.push(events::Event::SendShutdown {
 363                         node_id,
 364                         msg: res.0
 365                 });
 366
 367                 Ok(())
 368         }
 369
 370         #[inline]
 371         fn finish_force_close_channel(&self, shutdown_res: (Vec<Transaction>, Vec<[u8; 32]>)) {
 372                 let (local_txn, failed_htlcs) = shutdown_res;
 373                 for payment_hash in failed_htlcs {
 374                         // unknown_next_peer...I dunno who that is anymore....
 375                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
 376                 }
 377                 for tx in local_txn {
 378                         self.tx_broadcaster.broadcast_transaction(&tx);
 379                 }
 380                 //TODO: We need to have a way where outbound HTLC claims can result in us claiming the
 381                 //now-on-chain HTLC output for ourselves (and, thereafter, passing the HTLC backwards).
 382                 //TODO: We need to handle monitoring of pending offered HTLCs which just hit the chain and
 383                 //may be claimed, resulting in us claiming the inbound HTLCs (and back-failing after
 384                 //timeouts are hit and our claims confirm).
 385         }
 386
 387         /// Force closes a channel, immediately broadcasting the latest local commitment transaction to
 388         /// the chain and rejecting new HTLCs on the given channel.
 389         pub fn force_close_channel(&self, channel_id: &[u8; 32]) {
 390                 let mut chan = {
 391                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 392                         let channel_state = channel_state_lock.borrow_parts();
 393                         if let Some(chan) = channel_state.by_id.remove(channel_id) {
 394                                 if let Some(short_id) = chan.get_short_channel_id() {
 395                                         channel_state.short_to_id.remove(&short_id);
 396                                 }
 397                                 chan
 398                         } else {
 399                                 return;
 400                         }
 401                 };
 402                 self.finish_force_close_channel(chan.force_shutdown());
 403                 let mut events = self.pending_events.lock().unwrap();
 404                 if let Ok(update) = self.get_channel_update(&chan) {
 405                         events.push(events::Event::BroadcastChannelUpdate {
 406                                 msg: update
 407                         });
 408                 }
 409         }
 410
 411         #[inline]
 412         fn gen_rho_mu_from_shared_secret(shared_secret: &SharedSecret) -> ([u8; 32], [u8; 32]) {
 413                 ({
 414                         let mut hmac = Hmac::new(Sha256::new(), &[0x72, 0x68, 0x6f]); // rho
 415                         hmac.input(&shared_secret[..]);
 416                         let mut res = [0; 32];
 417                         hmac.raw_result(&mut res);
 418                         res
 419                 },
 420                 {
 421                         let mut hmac = Hmac::new(Sha256::new(), &[0x6d, 0x75]); // mu
 422                         hmac.input(&shared_secret[..]);
 423                         let mut res = [0; 32];
 424                         hmac.raw_result(&mut res);
 425                         res
 426                 })
 427         }
 428
 429         #[inline]
 430         fn gen_um_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 431                 let mut hmac = Hmac::new(Sha256::new(), &[0x75, 0x6d]); // um
 432                 hmac.input(&shared_secret[..]);
 433                 let mut res = [0; 32];
 434                 hmac.raw_result(&mut res);
 435                 res
 436         }
 437
 438         #[inline]
 439         fn gen_ammag_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 440                 let mut hmac = Hmac::new(Sha256::new(), &[0x61, 0x6d, 0x6d, 0x61, 0x67]); // ammag
 441                 hmac.input(&shared_secret[..]);
 442                 let mut res = [0; 32];
 443                 hmac.raw_result(&mut res);
 444                 res
 445         }
 446
 447         // can only fail if an intermediary hop has an invalid public key or session_priv is invalid
 448         #[inline]
 449         fn construct_onion_keys_callback<FType: FnMut(SharedSecret, [u8; 32], PublicKey, &RouteHop)> (secp_ctx: &Secp256k1, route: &Route, session_priv: &SecretKey, mut callback: FType) -> Result<(), HandleError> {
 450                 let mut blinded_priv = session_priv.clone();
 451                 let mut blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 452                 let mut first_iteration = true;
 453
 454                 for hop in route.hops.iter() {
 455                         let shared_secret = SharedSecret::new(secp_ctx, &hop.pubkey, &blinded_priv);
 456
 457                         let mut sha = Sha256::new();
 458                         sha.input(&blinded_pub.serialize()[..]);
 459                         sha.input(&shared_secret[..]);
 460                         let mut blinding_factor = [0u8; 32];
 461                         sha.result(&mut blinding_factor);
 462
 463                         if first_iteration {
 464                                 blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 465                                 first_iteration = false;
 466                         }
 467                         let ephemeral_pubkey = blinded_pub;
 468
 469                         secp_call!(blinded_priv.mul_assign(secp_ctx, &secp_call!(SecretKey::from_slice(secp_ctx, &blinding_factor))));
 470                         blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 471
 472                         callback(shared_secret, blinding_factor, ephemeral_pubkey, hop);
 473                 }
 474
 475                 Ok(())
 476         }
 477
 478         // can only fail if an intermediary hop has an invalid public key or session_priv is invalid
 479         fn construct_onion_keys(secp_ctx: &Secp256k1, route: &Route, session_priv: &SecretKey) -> Result<Vec<OnionKeys>, HandleError> {
 480                 let mut res = Vec::with_capacity(route.hops.len());
 481
 482                 Self::construct_onion_keys_callback(secp_ctx, route, session_priv, |shared_secret, _blinding_factor, ephemeral_pubkey, _| {
 483                         let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
 484
 485                         res.push(OnionKeys {
 486                                 #[cfg(test)]
 487                                 shared_secret,
 488                                 #[cfg(test)]
 489                                 blinding_factor: _blinding_factor,
 490                                 ephemeral_pubkey,
 491                                 rho,
 492                                 mu,
 493                         });
 494                 })?;
 495
 496                 Ok(res)
 497         }
 498
 499         /// returns the hop data, as well as the first-hop value_msat and CLTV value we should send.
 500         fn build_onion_payloads(route: &Route, starting_htlc_offset: u32) -> Result<(Vec<msgs::OnionHopData>, u64, u32), HandleError> {
 501                 let mut cur_value_msat = 0u64;
 502                 let mut cur_cltv = starting_htlc_offset;
 503                 let mut last_short_channel_id = 0;
 504                 let mut res: Vec<msgs::OnionHopData> = Vec::with_capacity(route.hops.len());
 505                 internal_traits::test_no_dealloc::<msgs::OnionHopData>(None);
 506                 unsafe { res.set_len(route.hops.len()); }
 507
 508                 for (idx, hop) in route.hops.iter().enumerate().rev() {
 509                         // First hop gets special values so that it can check, on receipt, that everything is
 510                         // exactly as it should be (and the next hop isn't trying to probe to find out if we're
 511                         // the intended recipient).
 512                         let value_msat = if cur_value_msat == 0 { hop.fee_msat } else { cur_value_msat };
 513                         let cltv = if cur_cltv == starting_htlc_offset { hop.cltv_expiry_delta + starting_htlc_offset } else { cur_cltv };
 514                         res[idx] = msgs::OnionHopData {
 515                                 realm: 0,
 516                                 data: msgs::OnionRealm0HopData {
 517                                         short_channel_id: last_short_channel_id,
 518                                         amt_to_forward: value_msat,
 519                                         outgoing_cltv_value: cltv,
 520                                 },
 521                                 hmac: [0; 32],
 522                         };
 523                         cur_value_msat += hop.fee_msat;
 524                         if cur_value_msat >= 21000000 * 100000000 * 1000 {
 525                                 return Err(HandleError{err: "Channel fees overflowed?!", action: None});
 526                         }
 527                         cur_cltv += hop.cltv_expiry_delta as u32;
 528                         if cur_cltv >= 500000000 {
 529                                 return Err(HandleError{err: "Channel CLTV overflowed?!", action: None});
 530                         }
 531                         last_short_channel_id = hop.short_channel_id;
 532                 }
 533                 Ok((res, cur_value_msat, cur_cltv))
 534         }
 535
 536         #[inline]
 537         fn shift_arr_right(arr: &mut [u8; 20*65]) {
 538                 unsafe {
 539                         ptr::copy(arr[0..].as_ptr(), arr[65..].as_mut_ptr(), 19*65);
 540                 }
 541                 for i in 0..65 {
 542                         arr[i] = 0;
 543                 }
 544         }
 545
 546         #[inline]
 547         fn xor_bufs(dst: &mut[u8], src: &[u8]) {
 548                 assert_eq!(dst.len(), src.len());
 549
 550                 for i in 0..dst.len() {
 551                         dst[i] ^= src[i];
 552                 }
 553         }
 554
 555         const ZERO:[u8; 21*65] = [0; 21*65];
 556         fn construct_onion_packet(mut payloads: Vec<msgs::OnionHopData>, onion_keys: Vec<OnionKeys>, associated_data: &[u8; 32]) -> Result<msgs::OnionPacket, HandleError> {
 557                 let mut buf = Vec::with_capacity(21*65);
 558                 buf.resize(21*65, 0);
 559
 560                 let filler = {
 561                         let iters = payloads.len() - 1;
 562                         let end_len = iters * 65;
 563                         let mut res = Vec::with_capacity(end_len);
 564                         res.resize(end_len, 0);
 565
 566                         for (i, keys) in onion_keys.iter().enumerate() {
 567                                 if i == payloads.len() - 1 { continue; }
 568                                 let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 569                                 chacha.process(&ChannelManager::ZERO, &mut buf); // We don't have a seek function :(
 570                                 ChannelManager::xor_bufs(&mut res[0..(i + 1)*65], &buf[(20 - i)*65..21*65]);
 571                         }
 572                         res
 573                 };
 574
 575                 let mut packet_data = [0; 20*65];
 576                 let mut hmac_res = [0; 32];
 577
 578                 for (i, (payload, keys)) in payloads.iter_mut().zip(onion_keys.iter()).rev().enumerate() {
 579                         ChannelManager::shift_arr_right(&mut packet_data);
 580                         payload.hmac = hmac_res;
 581                         packet_data[0..65].copy_from_slice(&payload.encode()[..]);
 582
 583                         let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 584                         chacha.process(&packet_data, &mut buf[0..20*65]);
 585                         packet_data[..].copy_from_slice(&buf[0..20*65]);
 586
 587                         if i == 0 {
 588                                 packet_data[20*65 - filler.len()..20*65].copy_from_slice(&filler[..]);
 589                         }
 590
 591                         let mut hmac = Hmac::new(Sha256::new(), &keys.mu);
 592                         hmac.input(&packet_data);
 593                         hmac.input(&associated_data[..]);
 594                         hmac.raw_result(&mut hmac_res);
 595                 }
 596
 597                 Ok(msgs::OnionPacket{
 598                         version: 0,
 599                         public_key: onion_keys.first().unwrap().ephemeral_pubkey,
 600                         hop_data: packet_data,
 601                         hmac: hmac_res,
 602                 })
 603         }
 604
 605         /// Encrypts a failure packet. raw_packet can either be a
 606         /// msgs::DecodedOnionErrorPacket.encode() result or a msgs::OnionErrorPacket.data element.
 607         fn encrypt_failure_packet(shared_secret: &SharedSecret, raw_packet: &[u8]) -> msgs::OnionErrorPacket {
 608                 let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
 609
 610                 let mut packet_crypted = Vec::with_capacity(raw_packet.len());
 611                 packet_crypted.resize(raw_packet.len(), 0);
 612                 let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
 613                 chacha.process(&raw_packet, &mut packet_crypted[..]);
 614                 msgs::OnionErrorPacket {
 615                         data: packet_crypted,
 616                 }
 617         }
 618
 619         fn build_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::DecodedOnionErrorPacket {
 620                 assert!(failure_data.len() <= 256 - 2);
 621
 622                 let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
 623
 624                 let failuremsg = {
 625                         let mut res = Vec::with_capacity(2 + failure_data.len());
 626                         res.push(((failure_type >> 8) & 0xff) as u8);
 627                         res.push(((failure_type >> 0) & 0xff) as u8);
 628                         res.extend_from_slice(&failure_data[..]);
 629                         res
 630                 };
 631                 let pad = {
 632                         let mut res = Vec::with_capacity(256 - 2 - failure_data.len());
 633                         res.resize(256 - 2 - failure_data.len(), 0);
 634                         res
 635                 };
 636                 let mut packet = msgs::DecodedOnionErrorPacket {
 637                         hmac: [0; 32],
 638                         failuremsg: failuremsg,
 639                         pad: pad,
 640                 };
 641
 642                 let mut hmac = Hmac::new(Sha256::new(), &um);
 643                 hmac.input(&packet.encode()[32..]);
 644                 hmac.raw_result(&mut packet.hmac);
 645
 646                 packet
 647         }
 648
 649         #[inline]
 650         fn build_first_hop_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::OnionErrorPacket {
 651                 let failure_packet = ChannelManager::build_failure_packet(shared_secret, failure_type, failure_data);
 652                 ChannelManager::encrypt_failure_packet(shared_secret, &failure_packet.encode()[..])
 653         }
 654
 655         /// only fails if the channel does not yet have an assigned short_id
 656         fn get_channel_update(&self, chan: &Channel) -> Result<msgs::ChannelUpdate, HandleError> {
 657                 let short_channel_id = match chan.get_short_channel_id() {
 658                         None => return Err(HandleError{err: "Channel not yet established", action: None}),
 659                         Some(id) => id,
 660                 };
 661
 662                 let were_node_one = PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).unwrap().serialize()[..] < chan.get_their_node_id().serialize()[..];
 663
 664                 let unsigned = msgs::UnsignedChannelUpdate {
 665                         chain_hash: self.genesis_hash,
 666                         short_channel_id: short_channel_id,
 667                         timestamp: chan.get_channel_update_count(),
 668                         flags: (!were_node_one) as u16 | ((!chan.is_live() as u16) << 1),
 669                         cltv_expiry_delta: CLTV_EXPIRY_DELTA,
 670                         htlc_minimum_msat: chan.get_our_htlc_minimum_msat(),
 671                         fee_base_msat: chan.get_our_fee_base_msat(&*self.fee_estimator),
 672                         fee_proportional_millionths: self.fee_proportional_millionths,
 673                 };
 674
 675                 let msg_hash = Sha256dHash::from_data(&unsigned.encode()[..]);
 676                 let sig = self.secp_ctx.sign(&Message::from_slice(&msg_hash[..]).unwrap(), &self.our_network_key).unwrap(); //TODO Can we unwrap here?
 677
 678                 Ok(msgs::ChannelUpdate {
 679                         signature: sig,
 680                         contents: unsigned
 681                 })
 682         }
 683
 684         /// Sends a payment along a given route.
 685         /// Value parameters are provided via the last hop in route, see documentation for RouteHop
 686         /// fields for more info.
 687         /// Note that if the payment_hash already exists elsewhere (eg you're sending a duplicative
 688         /// payment), we don't do anything to stop you! We always try to ensure that if the provided
 689         /// next hop knows the preimage to payment_hash they can claim an additional amount as
 690         /// specified in the last hop in the route! Thus, you should probably do your own
 691         /// payment_preimage tracking (which you should already be doing as they represent "proof of
 692         /// payment") and prevent double-sends yourself.
 693         /// See-also docs on Channel::send_htlc_and_commit.
 694         /// May generate a SendHTLCs event on success, which should be relayed.
 695         pub fn send_payment(&self, route: Route, payment_hash: [u8; 32]) -> Result<(), HandleError> {
 696                 if route.hops.len() < 1 || route.hops.len() > 20 {
 697                         return Err(HandleError{err: "Route didn't go anywhere/had bogus size", action: None});
 698                 }
 699                 let our_node_id = self.get_our_node_id();
 700                 for (idx, hop) in route.hops.iter().enumerate() {
 701                         if idx != route.hops.len() - 1 && hop.pubkey == our_node_id {
 702                                 return Err(HandleError{err: "Route went through us but wasn't a simple rebalance loop to us", action: None});
 703                         }
 704                 }
 705
 706                 let session_priv = secp_call!(SecretKey::from_slice(&self.secp_ctx, &{
 707                         let mut session_key = [0; 32];
 708                         rng::fill_bytes(&mut session_key);
 709                         session_key
 710                 }));
 711
 712                 let cur_height = self.latest_block_height.load(Ordering::Acquire) as u32 + 1;
 713
 714                 let onion_keys = ChannelManager::construct_onion_keys(&self.secp_ctx, &route, &session_priv)?;
 715                 let (onion_payloads, htlc_msat, htlc_cltv) = ChannelManager::build_onion_payloads(&route, cur_height)?;
 716                 let onion_packet = ChannelManager::construct_onion_packet(onion_payloads, onion_keys, &payment_hash)?;
 717
 718                 let (first_hop_node_id, (update_add, commitment_signed, chan_monitor)) = {
 719                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 720                         let channel_state = channel_state_lock.borrow_parts();
 721
 722                         let id = match channel_state.short_to_id.get(&route.hops.first().unwrap().short_channel_id) {
 723                                 None => return Err(HandleError{err: "No channel available with first hop!", action: None}),
 724                                 Some(id) => id.clone()
 725                         };
 726
 727                         let claimable_htlc_entry = channel_state.claimable_htlcs.entry(payment_hash.clone());
 728                         if let hash_map::Entry::Occupied(_) = claimable_htlc_entry {
 729                                 return Err(HandleError{err: "Already had pending HTLC with the same payment_hash", action: None});
 730                         }
 731
 732                         let res = {
 733                                 let chan = channel_state.by_id.get_mut(&id).unwrap();
 734                                 if chan.get_their_node_id() != route.hops.first().unwrap().pubkey {
 735                                         return Err(HandleError{err: "Node ID mismatch on first hop!", action: None});
 736                                 }
 737                                 chan.send_htlc_and_commit(htlc_msat, payment_hash, htlc_cltv, onion_packet)?
 738                         };
 739
 740                         let first_hop_node_id = route.hops.first().unwrap().pubkey;
 741
 742                         claimable_htlc_entry.or_insert(PendingOutboundHTLC::OutboundRoute {
 743                                 route,
 744                                 session_priv,
 745                         });
 746
 747                         match res {
 748                                 Some(msgs) => (first_hop_node_id, msgs),
 749                                 None => return Ok(()),
 750                         }
 751                 };
 752
 753                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 754                         unimplemented!(); // maybe remove from claimable_htlcs?
 755                 }
 756
 757                 let mut events = self.pending_events.lock().unwrap();
 758                 events.push(events::Event::SendHTLCs {
 759                         node_id: first_hop_node_id,
 760                         msgs: vec![update_add],
 761                         commitment_msg: commitment_signed,
 762                 });
 763                 Ok(())
 764         }
 765
 766         /// Call this upon creation of a funding transaction for the given channel.
 767         /// Panics if a funding transaction has already been provided for this channel.
 768         pub fn funding_transaction_generated(&self, temporary_channel_id: &[u8; 32], funding_txo: OutPoint) {
 769                 macro_rules! add_pending_event {
 770                         ($event: expr) => {
 771                                 {
 772                                         let mut pending_events = self.pending_events.lock().unwrap();
 773                                         pending_events.push($event);
 774                                 }
 775                         }
 776                 }
 777
 778                 let (chan, msg, chan_monitor) = {
 779                         let mut channel_state = self.channel_state.lock().unwrap();
 780                         match channel_state.by_id.remove(temporary_channel_id) {
 781                                 Some(mut chan) => {
 782                                         match chan.get_outbound_funding_created(funding_txo) {
 783                                                 Ok(funding_msg) => {
 784                                                         (chan, funding_msg.0, funding_msg.1)
 785                                                 },
 786                                                 Err(e) => {
 787                                                         mem::drop(channel_state);
 788                                                         add_pending_event!(events::Event::DisconnectPeer {
 789                                                                 node_id: chan.get_their_node_id(),
 790                                                                 msg: if let Some(msgs::ErrorAction::DisconnectPeer { msg } ) = e.action { msg } else { None },
 791                                                         });
 792
 793                                                         return;
 794                                                 },
 795                                         }
 796                                 },
 797                                 None => return
 798                         }
 799                 }; // Release channel lock for install_watch_outpoint call,
 800                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 801                         unimplemented!(); // maybe remove from claimable_htlcs?
 802                 }
 803                 add_pending_event!(events::Event::SendFundingCreated {
 804                         node_id: chan.get_their_node_id(),
 805                         msg: msg,
 806                 });
 807
 808                 let mut channel_state = self.channel_state.lock().unwrap();
 809                 channel_state.by_id.insert(chan.channel_id(), chan);
 810         }
 811
 812         fn get_announcement_sigs(&self, chan: &Channel) -> Result<Option<msgs::AnnouncementSignatures>, HandleError> {
 813                 if !chan.is_usable() || !chan.should_announce() { return Ok(None) }
 814
 815                 let (announcement, our_bitcoin_sig) = chan.get_channel_announcement(self.get_our_node_id(), self.genesis_hash.clone())?;
 816                 let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
 817                 let our_node_sig = secp_call!(self.secp_ctx.sign(&msghash, &self.our_network_key));
 818
 819                 Ok(Some(msgs::AnnouncementSignatures {
 820                         channel_id: chan.channel_id(),
 821                         short_channel_id: chan.get_short_channel_id().unwrap(),
 822                         node_signature: our_node_sig,
 823                         bitcoin_signature: our_bitcoin_sig,
 824                 }))
 825         }
 826
 827         /// Processes HTLCs which are pending waiting on random forward delay.
 828         /// Should only really ever be called in response to an PendingHTLCsForwardable event.
 829         /// Will likely generate further events.
 830         pub fn process_pending_htlc_forwards(&self) {
 831                 let mut new_events = Vec::new();
 832                 let mut failed_forwards = Vec::new();
 833                 {
 834                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 835                         let channel_state = channel_state_lock.borrow_parts();
 836
 837                         if cfg!(not(feature = "fuzztarget")) && Instant::now() < *channel_state.next_forward {
 838                                 return;
 839                         }
 840
 841                         for (short_chan_id, pending_forwards) in channel_state.forward_htlcs.drain() {
 842                                 if short_chan_id != 0 {
 843                                         let forward_chan_id = match channel_state.short_to_id.get(&short_chan_id) {
 844                                                 Some(chan_id) => chan_id.clone(),
 845                                                 None => {
 846                                                         failed_forwards.reserve(pending_forwards.len());
 847                                                         for forward_info in pending_forwards {
 848                                                                 failed_forwards.push((forward_info.payment_hash, 0x4000 | 10, None));
 849                                                         }
 850                                                         continue;
 851                                                 }
 852                                         };
 853                                         let forward_chan = &mut channel_state.by_id.get_mut(&forward_chan_id).unwrap();
 854
 855                                         let mut add_htlc_msgs = Vec::new();
 856                                         for forward_info in pending_forwards {
 857                                                 match forward_chan.send_htlc(forward_info.amt_to_forward, forward_info.payment_hash, forward_info.outgoing_cltv_value, forward_info.onion_packet.unwrap()) {
 858                                                         Err(_e) => {
 859                                                                 let chan_update = self.get_channel_update(forward_chan).unwrap();
 860                                                                 failed_forwards.push((forward_info.payment_hash, 0x1000 | 7, Some(chan_update)));
 861                                                                 continue;
 862                                                         },
 863                                                         Ok(update_add) => {
 864                                                                 match update_add {
 865                                                                         Some(msg) => { add_htlc_msgs.push(msg); },
 866                                                                         None => {
 867                                                                                 // Nothing to do here...we're waiting on a remote
 868                                                                                 // revoke_and_ack before we can add anymore HTLCs. The Channel
 869                                                                                 // will automatically handle building the update_add_htlc and
 870                                                                                 // commitment_signed messages when we can.
 871                                                                                 // TODO: Do some kind of timer to set the channel as !is_live()
 872                                                                                 // as we don't really want others relying on us relaying through
 873                                                                                 // this channel currently :/.
 874                                                                         }
 875                                                                 }
 876                                                         }
 877                                                 }
 878                                         }
 879
 880                                         if !add_htlc_msgs.is_empty() {
 881                                                 let (commitment_msg, monitor) = match forward_chan.send_commitment() {
 882                                                         Ok(res) => res,
 883                                                         Err(_) => {
 884                                                                 //TODO: Handle...this is bad!
 885                                                                 continue;
 886                                                         },
 887                                                 };
 888                                                 new_events.push((Some(monitor), events::Event::SendHTLCs {
 889                                                         node_id: forward_chan.get_their_node_id(),
 890                                                         msgs: add_htlc_msgs,
 891                                                         commitment_msg: commitment_msg,
 892                                                 }));
 893                                         }
 894                                 } else {
 895                                         for forward_info in pending_forwards {
 896                                                 new_events.push((None, events::Event::PaymentReceived {
 897                                                         payment_hash: forward_info.payment_hash,
 898                                                         amt: forward_info.amt_to_forward,
 899                                                 }));
 900                                         }
 901                                 }
 902                         }
 903                 }
 904
 905                 for failed_forward in failed_forwards.drain(..) {
 906                         match failed_forward.2 {
 907                                 None => self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &failed_forward.0, HTLCFailReason::Reason { failure_code: failed_forward.1, data: Vec::new() }),
 908                                 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() }),
 909                         };
 910                 }
 911
 912                 if new_events.is_empty() { return }
 913
 914                 new_events.retain(|event| {
 915                         if let &Some(ref monitor) = &event.0 {
 916                                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor.clone()) {
 917                                         unimplemented!();// but def dont push the event...
 918                                 }
 919                         }
 920                         true
 921                 });
 922
 923                 let mut events = self.pending_events.lock().unwrap();
 924                 events.reserve(new_events.len());
 925                 for event in new_events.drain(..) {
 926                         events.push(event.1);
 927                 }
 928         }
 929
 930         /// Indicates that the preimage for payment_hash is unknown after a PaymentReceived event.
 931         pub fn fail_htlc_backwards(&self, payment_hash: &[u8; 32]) -> bool {
 932                 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 15, data: Vec::new() })
 933         }
 934
 935         /// Fails an HTLC backwards to the sender of it to us.
 936         /// Note that while we take a channel_state lock as input, we do *not* assume consistency here.
 937         /// There are several callsites that do stupid things like loop over a list of payment_hashes
 938         /// to fail and take the channel_state lock for each iteration (as we take ownership and may
 939         /// drop it). In other words, no assumptions are made that entries in claimable_htlcs point to
 940         /// still-available channels.
 941         fn fail_htlc_backwards_internal(&self, mut channel_state: MutexGuard<ChannelHolder>, payment_hash: &[u8; 32], onion_error: HTLCFailReason) -> bool {
 942                 let mut pending_htlc = {
 943                         match channel_state.claimable_htlcs.remove(payment_hash) {
 944                                 Some(pending_htlc) => pending_htlc,
 945                                 None => return false,
 946                         }
 947                 };
 948
 949                 match pending_htlc {
 950                         PendingOutboundHTLC::CycledRoute { source_short_channel_id, incoming_packet_shared_secret, route, session_priv } => {
 951                                 channel_state.claimable_htlcs.insert(payment_hash.clone(), PendingOutboundHTLC::OutboundRoute {
 952                                         route,
 953                                         session_priv,
 954                                 });
 955                                 pending_htlc = PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret };
 956                         },
 957                         _ => {}
 958                 }
 959
 960                 match pending_htlc {
 961                         PendingOutboundHTLC::CycledRoute { .. } => unreachable!(),
 962                         PendingOutboundHTLC::OutboundRoute { .. } => {
 963                                 mem::drop(channel_state);
 964
 965                                 let mut pending_events = self.pending_events.lock().unwrap();
 966                                 pending_events.push(events::Event::PaymentFailed {
 967                                         payment_hash: payment_hash.clone()
 968                                 });
 969                                 false
 970                         },
 971                         PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret } => {
 972                                 let err_packet = match onion_error {
 973                                         HTLCFailReason::Reason { failure_code, data } => {
 974                                                 let packet = ChannelManager::build_failure_packet(&incoming_packet_shared_secret, failure_code, &data[..]).encode();
 975                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &packet)
 976                                         },
 977                                         HTLCFailReason::ErrorPacket { err } => {
 978                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &err.data)
 979                                         }
 980                                 };
 981
 982                                 let (node_id, fail_msgs) = {
 983                                         let chan_id = match channel_state.short_to_id.get(&source_short_channel_id) {
 984                                                 Some(chan_id) => chan_id.clone(),
 985                                                 None => return false
 986                                         };
 987
 988                                         let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
 989                                         match chan.get_update_fail_htlc_and_commit(payment_hash, err_packet) {
 990                                                 Ok(msg) => (chan.get_their_node_id(), msg),
 991                                                 Err(_e) => {
 992                                                         //TODO: Do something with e?
 993                                                         return false;
 994                                                 },
 995                                         }
 996                                 };
 997
 998                                 match fail_msgs {
 999                                         Some((msg, commitment_msg, chan_monitor)) => {
1000                                                 mem::drop(channel_state);
1001
1002                                                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1003                                                         unimplemented!();// but def dont push the event...
1004                                                 }
1005
1006                                                 let mut pending_events = self.pending_events.lock().unwrap();
1007                                                 pending_events.push(events::Event::SendFailHTLC {
1008                                                         node_id,
1009                                                         msg: msg,
1010                                                         commitment_msg: commitment_msg,
1011                                                 });
1012                                         },
1013                                         None => {},
1014                                 }
1015
1016                                 true
1017                         },
1018                 }
1019         }
1020
1021         /// Provides a payment preimage in response to a PaymentReceived event, returning true and
1022         /// generating message events for the net layer to claim the payment, if possible. Thus, you
1023         /// should probably kick the net layer to go send messages if this returns true!
1024         /// May panic if called except in response to a PaymentReceived event.
1025         pub fn claim_funds(&self, payment_preimage: [u8; 32]) -> bool {
1026                 self.claim_funds_internal(payment_preimage, true)
1027         }
1028         fn claim_funds_internal(&self, payment_preimage: [u8; 32], from_user: bool) -> bool {
1029                 let mut sha = Sha256::new();
1030                 sha.input(&payment_preimage);
1031                 let mut payment_hash = [0; 32];
1032                 sha.result(&mut payment_hash);
1033
1034                 let mut channel_state = self.channel_state.lock().unwrap();
1035                 let mut pending_htlc = {
1036                         match channel_state.claimable_htlcs.remove(&payment_hash) {
1037                                 Some(pending_htlc) => pending_htlc,
1038                                 None => return false,
1039                         }
1040                 };
1041
1042                 match pending_htlc {
1043                         PendingOutboundHTLC::CycledRoute { source_short_channel_id, incoming_packet_shared_secret, route, session_priv } => {
1044                                 if from_user { // This was the end hop back to us
1045                                         pending_htlc = PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret };
1046                                         channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::OutboundRoute { route, session_priv });
1047                                 } else { // This came from the first upstream node
1048                                         // Bank error in our favor! Maybe we should tell the user this somehow???
1049                                         pending_htlc = PendingOutboundHTLC::OutboundRoute { route, session_priv };
1050                                         channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret });
1051                                 }
1052                         },
1053                         _ => {},
1054                 }
1055
1056                 match pending_htlc {
1057                         PendingOutboundHTLC::CycledRoute { .. } => unreachable!(),
1058                         PendingOutboundHTLC::OutboundRoute { .. } => {
1059                                 if from_user {
1060                                         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...");
1061                                 }
1062                                 mem::drop(channel_state);
1063                                 let mut pending_events = self.pending_events.lock().unwrap();
1064                                 pending_events.push(events::Event::PaymentSent {
1065                                         payment_preimage
1066                                 });
1067                                 false
1068                         },
1069                         PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, .. } => {
1070                                 let (node_id, fulfill_msgs) = {
1071                                         let chan_id = match channel_state.short_to_id.get(&source_short_channel_id) {
1072                                                 Some(chan_id) => chan_id.clone(),
1073                                                 None => {
1074                                                         // TODO: There is probably a channel manager somewhere that needs to
1075                                                         // learn the preimage as the channel already hit the chain and that's
1076                                                         // why its missing.
1077                                                         return false
1078                                                 }
1079                                         };
1080
1081                                         let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
1082                                         match chan.get_update_fulfill_htlc_and_commit(payment_preimage) {
1083                                                 Ok(msg) => (chan.get_their_node_id(), msg),
1084                                                 Err(_e) => {
1085                                                         // TODO: There is probably a channel manager somewhere that needs to
1086                                                         // learn the preimage as the channel may be about to hit the chain.
1087                                                         //TODO: Do something with e?
1088                                                         return false;
1089                                                 },
1090                                         }
1091                                 };
1092
1093                                 mem::drop(channel_state);
1094                                 if let Some(chan_monitor) = fulfill_msgs.1 {
1095                                         if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1096                                                 unimplemented!();// but def dont push the event...
1097                                         }
1098                                 }
1099
1100                                 if let Some((msg, commitment_msg)) = fulfill_msgs.0 {
1101                                         let mut pending_events = self.pending_events.lock().unwrap();
1102                                         pending_events.push(events::Event::SendFulfillHTLC {
1103                                                 node_id: node_id,
1104                                                 msg,
1105                                                 commitment_msg,
1106                                         });
1107                                 }
1108                                 true
1109                         },
1110                 }
1111         }
1112
1113         /// Gets the node_id held by this ChannelManager
1114         pub fn get_our_node_id(&self) -> PublicKey {
1115                 PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).unwrap()
1116         }
1117
1118         /// Used to restore channels to normal operation after a
1119         /// ChannelMonitorUpdateErr::TemporaryFailure was returned from a channel monitor update
1120         /// operation.
1121         pub fn test_restore_channel_monitor(&self) {
1122                 unimplemented!();
1123         }
1124 }
1125
1126 impl events::EventsProvider for ChannelManager {
1127         fn get_and_clear_pending_events(&self) -> Vec<events::Event> {
1128                 let mut pending_events = self.pending_events.lock().unwrap();
1129                 let mut ret = Vec::new();
1130                 mem::swap(&mut ret, &mut *pending_events);
1131                 ret
1132         }
1133 }
1134
1135 impl ChainListener for ChannelManager {
1136         fn block_connected(&self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) {
1137                 let mut new_events = Vec::new();
1138                 let mut failed_channels = Vec::new();
1139                 {
1140                         let mut channel_lock = self.channel_state.lock().unwrap();
1141                         let channel_state = channel_lock.borrow_parts();
1142                         let short_to_id = channel_state.short_to_id;
1143                         channel_state.by_id.retain(|_, channel| {
1144                                 if let Some(funding_locked) = channel.block_connected(header, height, txn_matched, indexes_of_txn_matched) {
1145                                         let announcement_sigs = match self.get_announcement_sigs(channel) {
1146                                                 Ok(res) => res,
1147                                                 Err(_e) => {
1148                                                         //TODO: push e on events and blow up the channel (it has bad keys)
1149                                                         return true;
1150                                                 }
1151                                         };
1152                                         new_events.push(events::Event::SendFundingLocked {
1153                                                 node_id: channel.get_their_node_id(),
1154                                                 msg: funding_locked,
1155                                                 announcement_sigs: announcement_sigs
1156                                         });
1157                                         short_to_id.insert(channel.get_short_channel_id().unwrap(), channel.channel_id());
1158                                 }
1159                                 if let Some(funding_txo) = channel.get_funding_txo() {
1160                                         for tx in txn_matched {
1161                                                 for inp in tx.input.iter() {
1162                                                         if inp.prev_hash == funding_txo.txid && inp.prev_index == funding_txo.index as u32 {
1163                                                                 if let Some(short_id) = channel.get_short_channel_id() {
1164                                                                         short_to_id.remove(&short_id);
1165                                                                 }
1166                                                                 // It looks like our counterparty went on-chain. We go ahead and
1167                                                                 // broadcast our latest local state as well here, just in case its
1168                                                                 // some kind of SPV attack, though we expect these to be dropped.
1169                                                                 failed_channels.push(channel.force_shutdown());
1170                                                                 if let Ok(update) = self.get_channel_update(&channel) {
1171                                                                         new_events.push(events::Event::BroadcastChannelUpdate {
1172                                                                                 msg: update
1173                                                                         });
1174                                                                 }
1175                                                                 return false;
1176                                                         }
1177                                                 }
1178                                         }
1179                                 }
1180                                 if channel.channel_monitor().would_broadcast_at_height(height) {
1181                                         if let Some(short_id) = channel.get_short_channel_id() {
1182                                                 short_to_id.remove(&short_id);
1183                                         }
1184                                         failed_channels.push(channel.force_shutdown());
1185                                         // If would_broadcast_at_height() is true, the channel_monitor will broadcast
1186                                         // the latest local tx for us, so we should skip that here (it doesn't really
1187                                         // hurt anything, but does make tests a bit simpler).
1188                                         failed_channels.last_mut().unwrap().0 = Vec::new();
1189                                         if let Ok(update) = self.get_channel_update(&channel) {
1190                                                 new_events.push(events::Event::BroadcastChannelUpdate {
1191                                                         msg: update
1192                                                 });
1193                                         }
1194                                         return false;
1195                                 }
1196                                 true
1197                         });
1198                 }
1199                 for failure in failed_channels.drain(..) {
1200                         self.finish_force_close_channel(failure);
1201                 }
1202                 let mut pending_events = self.pending_events.lock().unwrap();
1203                 for funding_locked in new_events.drain(..) {
1204                         pending_events.push(funding_locked);
1205                 }
1206                 self.latest_block_height.store(height as usize, Ordering::Release);
1207         }
1208
1209         /// We force-close the channel without letting our counterparty participate in the shutdown
1210         fn block_disconnected(&self, header: &BlockHeader) {
1211                 let mut new_events = Vec::new();
1212                 let mut failed_channels = Vec::new();
1213                 {
1214                         let mut channel_lock = self.channel_state.lock().unwrap();
1215                         let channel_state = channel_lock.borrow_parts();
1216                         let short_to_id = channel_state.short_to_id;
1217                         channel_state.by_id.retain(|_,  v| {
1218                                 if v.block_disconnected(header) {
1219                                         if let Some(short_id) = v.get_short_channel_id() {
1220                                                 short_to_id.remove(&short_id);
1221                                         }
1222                                         failed_channels.push(v.force_shutdown());
1223                                         if let Ok(update) = self.get_channel_update(&v) {
1224                                                 new_events.push(events::Event::BroadcastChannelUpdate {
1225                                                         msg: update
1226                                                 });
1227                                         }
1228                                         false
1229                                 } else {
1230                                         true
1231                                 }
1232                         });
1233                 }
1234                 for failure in failed_channels.drain(..) {
1235                         self.finish_force_close_channel(failure);
1236                 }
1237                 if !new_events.is_empty() {
1238                         let mut pending_events = self.pending_events.lock().unwrap();
1239                         for funding_locked in new_events.drain(..) {
1240                                 pending_events.push(funding_locked);
1241                         }
1242                 }
1243                 self.latest_block_height.fetch_sub(1, Ordering::AcqRel);
1244         }
1245 }
1246
1247 impl ChannelMessageHandler for ChannelManager {
1248         //TODO: Handle errors and close channel (or so)
1249         fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &msgs::OpenChannel) -> Result<msgs::AcceptChannel, HandleError> {
1250                 if msg.chain_hash != self.genesis_hash {
1251                         return Err(HandleError{err: "Unknown genesis block hash", action: None});
1252                 }
1253                 let mut channel_state = self.channel_state.lock().unwrap();
1254                 if channel_state.by_id.contains_key(&msg.temporary_channel_id) {
1255                         return Err(HandleError{err: "temporary_channel_id collision!", action: None});
1256                 }
1257
1258                 let chan_keys = if cfg!(feature = "fuzztarget") {
1259                         ChannelKeys {
1260                                 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, 0]).unwrap(),
1261                                 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, 0]).unwrap(),
1262                                 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, 0]).unwrap(),
1263                                 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, 0]).unwrap(),
1264                                 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, 0]).unwrap(),
1265                                 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, 0]).unwrap(),
1266                                 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, 0]).unwrap(),
1267                                 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],
1268                         }
1269                 } else {
1270                         let mut key_seed = [0u8; 32];
1271                         rng::fill_bytes(&mut key_seed);
1272                         match ChannelKeys::new_from_seed(&key_seed) {
1273                                 Ok(key) => key,
1274                                 Err(_) => panic!("RNG is busted!")
1275                         }
1276                 };
1277
1278                 let channel = Channel::new_from_req(&*self.fee_estimator, chan_keys, their_node_id.clone(), msg, 0, false, self.announce_channels_publicly)?;
1279                 let accept_msg = channel.get_accept_channel()?;
1280                 channel_state.by_id.insert(channel.channel_id(), channel);
1281                 Ok(accept_msg)
1282         }
1283
1284         fn handle_accept_channel(&self, their_node_id: &PublicKey, msg: &msgs::AcceptChannel) -> Result<(), HandleError> {
1285                 let (value, output_script, user_id) = {
1286                         let mut channel_state = self.channel_state.lock().unwrap();
1287                         match channel_state.by_id.get_mut(&msg.temporary_channel_id) {
1288                                 Some(chan) => {
1289                                         if chan.get_their_node_id() != *their_node_id {
1290                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1291                                         }
1292                                         chan.accept_channel(&msg)?;
1293                                         (chan.get_value_satoshis(), chan.get_funding_redeemscript().to_v0_p2wsh(), chan.get_user_id())
1294                                 },
1295                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1296                         }
1297                 };
1298                 let mut pending_events = self.pending_events.lock().unwrap();
1299                 pending_events.push(events::Event::FundingGenerationReady {
1300                         temporary_channel_id: msg.temporary_channel_id,
1301                         channel_value_satoshis: value,
1302                         output_script: output_script,
1303                         user_channel_id: user_id,
1304                 });
1305                 Ok(())
1306         }
1307
1308         fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) -> Result<msgs::FundingSigned, HandleError> {
1309                 //TODO: broke this - a node shouldn't be able to get their channel removed by sending a
1310                 //funding_created a second time, or long after the first, or whatever (note this also
1311                 //leaves the short_to_id map in a busted state.
1312                 let (chan, funding_msg, monitor_update) = {
1313                         let mut channel_state = self.channel_state.lock().unwrap();
1314                         match channel_state.by_id.remove(&msg.temporary_channel_id) {
1315                                 Some(mut chan) => {
1316                                         if chan.get_their_node_id() != *their_node_id {
1317                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1318                                         }
1319                                         match chan.funding_created(msg) {
1320                                                 Ok((funding_msg, monitor_update)) => {
1321                                                         (chan, funding_msg, monitor_update)
1322                                                 },
1323                                                 Err(e) => {
1324                                                         return Err(e);
1325                                                 }
1326                                         }
1327                                 },
1328                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1329                         }
1330                 }; // Release channel lock for install_watch_outpoint call,
1331                    // note that this means if the remote end is misbehaving and sends a message for the same
1332                    // channel back-to-back with funding_created, we'll end up thinking they sent a message
1333                    // for a bogus channel.
1334                 if let Err(_e) = self.monitor.add_update_monitor(monitor_update.get_funding_txo().unwrap(), monitor_update) {
1335                         unimplemented!();
1336                 }
1337                 let mut channel_state = self.channel_state.lock().unwrap();
1338                 channel_state.by_id.insert(funding_msg.channel_id, chan);
1339                 Ok(funding_msg)
1340         }
1341
1342         fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) -> Result<(), HandleError> {
1343                 let (funding_txo, user_id, monitor) = {
1344                         let mut channel_state = self.channel_state.lock().unwrap();
1345                         match channel_state.by_id.get_mut(&msg.channel_id) {
1346                                 Some(chan) => {
1347                                         if chan.get_their_node_id() != *their_node_id {
1348                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1349                                         }
1350                                         let chan_monitor = chan.funding_signed(&msg)?;
1351                                         (chan.get_funding_txo().unwrap(), chan.get_user_id(), chan_monitor)
1352                                 },
1353                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1354                         }
1355                 };
1356                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor) {
1357                         unimplemented!();
1358                 }
1359                 let mut pending_events = self.pending_events.lock().unwrap();
1360                 pending_events.push(events::Event::FundingBroadcastSafe {
1361                         funding_txo: funding_txo,
1362                         user_channel_id: user_id,
1363                 });
1364                 Ok(())
1365         }
1366
1367         fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &msgs::FundingLocked) -> Result<Option<msgs::AnnouncementSignatures>, HandleError> {
1368                 let mut channel_state = self.channel_state.lock().unwrap();
1369                 match channel_state.by_id.get_mut(&msg.channel_id) {
1370                         Some(chan) => {
1371                                 if chan.get_their_node_id() != *their_node_id {
1372                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1373                                 }
1374                                 chan.funding_locked(&msg)?;
1375                                 return Ok(self.get_announcement_sigs(chan)?);
1376                         },
1377                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1378                 };
1379         }
1380
1381         fn handle_shutdown(&self, their_node_id: &PublicKey, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>), HandleError> {
1382                 let (res, chan_option) = {
1383                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1384                         let channel_state = channel_state_lock.borrow_parts();
1385
1386                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1387                                 hash_map::Entry::Occupied(mut chan_entry) => {
1388                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1389                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1390                                         }
1391                                         let res = chan_entry.get_mut().shutdown(&*self.fee_estimator, &msg)?;
1392                                         if chan_entry.get().is_shutdown() {
1393                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
1394                                                         channel_state.short_to_id.remove(&short_id);
1395                                                 }
1396                                                 (res, Some(chan_entry.remove_entry().1))
1397                                         } else { (res, None) }
1398                                 },
1399                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1400                         }
1401                 };
1402                 for payment_hash in res.2 {
1403                         // unknown_next_peer...I dunno who that is anymore....
1404                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
1405                 }
1406                 if let Some(chan) = chan_option {
1407                         if let Ok(update) = self.get_channel_update(&chan) {
1408                                 let mut events = self.pending_events.lock().unwrap();
1409                                 events.push(events::Event::BroadcastChannelUpdate {
1410                                         msg: update
1411                                 });
1412                         }
1413                 }
1414                 Ok((res.0, res.1))
1415         }
1416
1417         fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &msgs::ClosingSigned) -> Result<Option<msgs::ClosingSigned>, HandleError> {
1418                 let (res, chan_option) = {
1419                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1420                         let channel_state = channel_state_lock.borrow_parts();
1421                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1422                                 hash_map::Entry::Occupied(mut chan_entry) => {
1423                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1424                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1425                                         }
1426                                         let res = chan_entry.get_mut().closing_signed(&*self.fee_estimator, &msg)?;
1427                                         if res.1.is_some() {
1428                                                 // We're done with this channel, we've got a signed closing transaction and
1429                                                 // will send the closing_signed back to the remote peer upon return. This
1430                                                 // also implies there are no pending HTLCs left on the channel, so we can
1431                                                 // fully delete it from tracking (the channel monitor is still around to
1432                                                 // watch for old state broadcasts)!
1433                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
1434                                                         channel_state.short_to_id.remove(&short_id);
1435                                                 }
1436                                                 (res, Some(chan_entry.remove_entry().1))
1437                                         } else { (res, None) }
1438                                 },
1439                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1440                         }
1441                 };
1442                 if let Some(broadcast_tx) = res.1 {
1443                         self.tx_broadcaster.broadcast_transaction(&broadcast_tx);
1444                 }
1445                 if let Some(chan) = chan_option {
1446                         if let Ok(update) = self.get_channel_update(&chan) {
1447                                 let mut events = self.pending_events.lock().unwrap();
1448                                 events.push(events::Event::BroadcastChannelUpdate {
1449                                         msg: update
1450                                 });
1451                         }
1452                 }
1453                 Ok(res.0)
1454         }
1455
1456         fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) -> Result<(), msgs::HandleError> {
1457                 //TODO: BOLT 4 points out a specific attack where a peer may re-send an onion packet and
1458                 //determine the state of the payment based on our response/if we forward anything/the time
1459                 //we take to respond. We should take care to avoid allowing such an attack.
1460                 //
1461                 //TODO: There exists a further attack where a node may garble the onion data, forward it to
1462                 //us repeatedly garbled in different ways, and compare our error messages, which are
1463                 //encrypted with the same key. Its not immediately obvious how to usefully exploit that,
1464                 //but we should prevent it anyway.
1465
1466                 let shared_secret = SharedSecret::new(&self.secp_ctx, &msg.onion_routing_packet.public_key, &self.our_network_key);
1467                 let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
1468
1469                 macro_rules! get_onion_hash {
1470                         () => {
1471                                 {
1472                                         let mut sha = Sha256::new();
1473                                         sha.input(&msg.onion_routing_packet.hop_data);
1474                                         let mut onion_hash = [0; 32];
1475                                         sha.result(&mut onion_hash);
1476                                         onion_hash
1477                                 }
1478                         }
1479                 }
1480
1481                 macro_rules! return_err {
1482                         ($msg: expr, $err_code: expr, $data: expr) => {
1483                                 return Err(msgs::HandleError {
1484                                         err: $msg,
1485                                         action: Some(msgs::ErrorAction::UpdateFailHTLC {
1486                                                 msg: msgs::UpdateFailHTLC {
1487                                                         channel_id: msg.channel_id,
1488                                                         htlc_id: msg.htlc_id,
1489                                                         reason: ChannelManager::build_first_hop_failure_packet(&shared_secret, $err_code, $data),
1490                                                 }
1491                                         }),
1492                                 });
1493                         }
1494                 }
1495
1496                 if msg.onion_routing_packet.version != 0 {
1497                         //TODO: Spec doesn't indicate if we should only hash hop_data here (and in other
1498                         //sha256_of_onion error data packets), or the entire onion_routing_packet. Either way,
1499                         //the hash doesn't really serve any purpuse - in the case of hashing all data, the
1500                         //receiving node would have to brute force to figure out which version was put in the
1501                         //packet by the node that send us the message, in the case of hashing the hop_data, the
1502                         //node knows the HMAC matched, so they already know what is there...
1503                         return_err!("Unknown onion packet version", 0x8000 | 0x4000 | 4, &get_onion_hash!());
1504                 }
1505
1506                 let mut hmac = Hmac::new(Sha256::new(), &mu);
1507                 hmac.input(&msg.onion_routing_packet.hop_data);
1508                 hmac.input(&msg.payment_hash);
1509                 if hmac.result() != MacResult::new(&msg.onion_routing_packet.hmac) {
1510                         return_err!("HMAC Check failed", 0x8000 | 0x4000 | 5, &get_onion_hash!());
1511                 }
1512
1513                 let mut chacha = ChaCha20::new(&rho, &[0u8; 8]);
1514                 let next_hop_data = {
1515                         let mut decoded = [0; 65];
1516                         chacha.process(&msg.onion_routing_packet.hop_data[0..65], &mut decoded);
1517                         match msgs::OnionHopData::decode(&decoded[..]) {
1518                                 Err(err) => {
1519                                         let error_code = match err {
1520                                                 msgs::DecodeError::UnknownRealmByte => 0x4000 | 1,
1521                                                 _ => 0x2000 | 2, // Should never happen
1522                                         };
1523                                         return_err!("Unable to decode our hop data", error_code, &[0;0]);
1524                                 },
1525                                 Ok(msg) => msg
1526                         }
1527                 };
1528
1529                 //TODO: Check that msg.cltv_expiry is within acceptable bounds!
1530
1531                 let mut pending_forward_info = if next_hop_data.hmac == [0; 32] {
1532                                 // OUR PAYMENT!
1533                                 if next_hop_data.data.amt_to_forward != msg.amount_msat {
1534                                         return_err!("Upstream node sent less than we were supposed to receive in payment", 19, &byte_utils::be64_to_array(msg.amount_msat));
1535                                 }
1536                                 if next_hop_data.data.outgoing_cltv_value != msg.cltv_expiry {
1537                                         return_err!("Upstream node set CLTV to the wrong value", 18, &byte_utils::be32_to_array(msg.cltv_expiry));
1538                                 }
1539
1540                                 // Note that we could obviously respond immediately with an update_fulfill_htlc
1541                                 // message, however that would leak that we are the recipient of this payment, so
1542                                 // instead we stay symmetric with the forwarding case, only responding (after a
1543                                 // delay) once they've send us a commitment_signed!
1544
1545                                 PendingForwardHTLCInfo {
1546                                         onion_packet: None,
1547                                         payment_hash: msg.payment_hash.clone(),
1548                                         short_channel_id: 0,
1549                                         prev_short_channel_id: 0,
1550                                         amt_to_forward: next_hop_data.data.amt_to_forward,
1551                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
1552                                 }
1553                         } else {
1554                                 let mut new_packet_data = [0; 20*65];
1555                                 chacha.process(&msg.onion_routing_packet.hop_data[65..], &mut new_packet_data[0..19*65]);
1556                                 chacha.process(&ChannelManager::ZERO[0..65], &mut new_packet_data[19*65..]);
1557
1558                                 let mut new_pubkey = msg.onion_routing_packet.public_key.clone();
1559
1560                                 let blinding_factor = {
1561                                         let mut sha = Sha256::new();
1562                                         sha.input(&new_pubkey.serialize()[..]);
1563                                         sha.input(&shared_secret[..]);
1564                                         let mut res = [0u8; 32];
1565                                         sha.result(&mut res);
1566                                         match SecretKey::from_slice(&self.secp_ctx, &res) {
1567                                                 Err(_) => {
1568                                                         // Return temporary node failure as its technically our issue, not the
1569                                                         // channel's issue.
1570                                                         return_err!("Blinding factor is an invalid private key", 0x2000 | 2, &[0;0]);
1571                                                 },
1572                                                 Ok(key) => key
1573                                         }
1574                                 };
1575
1576                                 match new_pubkey.mul_assign(&self.secp_ctx, &blinding_factor) {
1577                                         Err(_) => {
1578                                                 // Return temporary node failure as its technically our issue, not the
1579                                                 // channel's issue.
1580                                                 return_err!("New blinding factor is an invalid private key", 0x2000 | 2, &[0;0]);
1581                                         },
1582                                         Ok(_) => {}
1583                                 };
1584
1585                                 let outgoing_packet = msgs::OnionPacket {
1586                                         version: 0,
1587                                         public_key: new_pubkey,
1588                                         hop_data: new_packet_data,
1589                                         hmac: next_hop_data.hmac.clone(),
1590                                 };
1591
1592                                 //TODO: Check amt_to_forward and outgoing_cltv_value are within acceptable ranges!
1593
1594                                 PendingForwardHTLCInfo {
1595                                         onion_packet: Some(outgoing_packet),
1596                                         payment_hash: msg.payment_hash.clone(),
1597                                         short_channel_id: next_hop_data.data.short_channel_id,
1598                                         prev_short_channel_id: 0,
1599                                         amt_to_forward: next_hop_data.data.amt_to_forward,
1600                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
1601                                 }
1602                         };
1603
1604                 let mut channel_state_lock = self.channel_state.lock().unwrap();
1605                 let channel_state = channel_state_lock.borrow_parts();
1606
1607                 if pending_forward_info.onion_packet.is_some() { // If short_channel_id is 0 here, we'll reject them in the body here
1608                         let forwarding_id = match channel_state.short_to_id.get(&pending_forward_info.short_channel_id) {
1609                                 None => {
1610                                         return_err!("Don't have available channel for forwarding as requested.", 0x4000 | 10, &[0;0]);
1611                                 },
1612                                 Some(id) => id.clone(),
1613                         };
1614                         let chan = channel_state.by_id.get_mut(&forwarding_id).unwrap();
1615                         if !chan.is_live() {
1616                                 let chan_update = self.get_channel_update(chan).unwrap();
1617                                 return_err!("Forwarding channel is not in a ready state.", 0x1000 | 7, &chan_update.encode_with_len()[..]);
1618                         }
1619                 }
1620
1621                 let claimable_htlcs_entry = channel_state.claimable_htlcs.entry(msg.payment_hash.clone());
1622
1623                 // We dont correctly handle payments that route through us twice on their way to their
1624                 // destination. That's OK since those nodes are probably busted or trying to do network
1625                 // mapping through repeated loops. In either case, we want them to stop talking to us, so
1626                 // we send permanent_node_failure.
1627                 if let &hash_map::Entry::Occupied(ref e) = &claimable_htlcs_entry {
1628                         let mut acceptable_cycle = false;
1629                         if let &PendingOutboundHTLC::OutboundRoute { .. } = e.get() {
1630                                 acceptable_cycle = pending_forward_info.short_channel_id == 0;
1631                         }
1632                         if !acceptable_cycle {
1633                                 return_err!("Payment looped through us twice", 0x4000 | 0x2000 | 2, &[0;0]);
1634                         }
1635                 }
1636
1637                 let (source_short_channel_id, res) = match channel_state.by_id.get_mut(&msg.channel_id) {
1638                         Some(chan) => {
1639                                 if chan.get_their_node_id() != *their_node_id {
1640                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1641                                 }
1642                                 if !chan.is_usable() {
1643                                         return Err(HandleError{err: "Channel not yet available for receiving HTLCs", action: None});
1644                                 }
1645                                 let short_channel_id = chan.get_short_channel_id().unwrap();
1646                                 pending_forward_info.prev_short_channel_id = short_channel_id;
1647                                 (short_channel_id, chan.update_add_htlc(&msg, pending_forward_info)?)
1648                         },
1649                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None}),
1650                 };
1651
1652                 match claimable_htlcs_entry {
1653                         hash_map::Entry::Occupied(mut e) => {
1654                                 let outbound_route = e.get_mut();
1655                                 let (route, session_priv) = match outbound_route {
1656                                         &mut PendingOutboundHTLC::OutboundRoute { ref route, ref session_priv } => {
1657                                                 (route.clone(), session_priv.clone())
1658                                         },
1659                                         _ => unreachable!(),
1660                                 };
1661                                 *outbound_route = PendingOutboundHTLC::CycledRoute {
1662                                         source_short_channel_id,
1663                                         incoming_packet_shared_secret: shared_secret,
1664                                         route,
1665                                         session_priv,
1666                                 };
1667                         },
1668                         hash_map::Entry::Vacant(e) => {
1669                                 e.insert(PendingOutboundHTLC::IntermediaryHopData {
1670                                         source_short_channel_id,
1671                                         incoming_packet_shared_secret: shared_secret,
1672                                 });
1673                         }
1674                 }
1675
1676                 Ok(res)
1677         }
1678
1679         fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) -> Result<(), HandleError> {
1680                 //TODO: Delay the claimed_funds relaying just like we do outbound relay!
1681                 // Claim funds first, cause we don't really care if the channel we received the message on
1682                 // is broken, we may have enough info to get our own money!
1683                 self.claim_funds_internal(msg.payment_preimage.clone(), false);
1684
1685                 let mut channel_state = self.channel_state.lock().unwrap();
1686                 match channel_state.by_id.get_mut(&msg.channel_id) {
1687                         Some(chan) => {
1688                                 if chan.get_their_node_id() != *their_node_id {
1689                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1690                                 }
1691                                 chan.update_fulfill_htlc(&msg)
1692                         },
1693                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1694                 }
1695         }
1696
1697         fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) -> Result<Option<msgs::HTLCFailChannelUpdate>, HandleError> {
1698                 let mut channel_state = self.channel_state.lock().unwrap();
1699                 let payment_hash = match channel_state.by_id.get_mut(&msg.channel_id) {
1700                         Some(chan) => {
1701                                 if chan.get_their_node_id() != *their_node_id {
1702                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1703                                 }
1704                                 chan.update_fail_htlc(&msg, HTLCFailReason::ErrorPacket { err: msg.reason.clone() })
1705                         },
1706                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1707                 }?;
1708
1709                 if let Some(pending_htlc) = channel_state.claimable_htlcs.get(&payment_hash) {
1710                         match pending_htlc {
1711                                 &PendingOutboundHTLC::OutboundRoute { ref route, ref session_priv } => {
1712                                         // Handle packed channel/node updates for passing back for the route handler
1713                                         let mut packet_decrypted = msg.reason.data.clone();
1714                                         let mut res = None;
1715                                         Self::construct_onion_keys_callback(&self.secp_ctx, &route, &session_priv, |shared_secret, _, _, route_hop| {
1716                                                 if res.is_some() { return; }
1717
1718                                                 let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
1719
1720                                                 let mut decryption_tmp = Vec::with_capacity(packet_decrypted.len());
1721                                                 decryption_tmp.resize(packet_decrypted.len(), 0);
1722                                                 let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
1723                                                 chacha.process(&packet_decrypted, &mut decryption_tmp[..]);
1724                                                 packet_decrypted = decryption_tmp;
1725
1726                                                 if let Ok(err_packet) = msgs::DecodedOnionErrorPacket::decode(&packet_decrypted) {
1727                                                         if err_packet.failuremsg.len() >= 2 {
1728                                                                 let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
1729
1730                                                                 let mut hmac = Hmac::new(Sha256::new(), &um);
1731                                                                 hmac.input(&err_packet.encode()[32..]);
1732                                                                 let mut calc_tag = [0u8; 32];
1733                                                                 hmac.raw_result(&mut calc_tag);
1734                                                                 if crypto::util::fixed_time_eq(&calc_tag, &err_packet.hmac) {
1735                                                                         const UNKNOWN_CHAN: u16 = 0x4000|10;
1736                                                                         const TEMP_CHAN_FAILURE: u16 = 0x4000|7;
1737                                                                         match byte_utils::slice_to_be16(&err_packet.failuremsg[0..2]) {
1738                                                                                 TEMP_CHAN_FAILURE => {
1739                                                                                         if err_packet.failuremsg.len() >= 4 {
1740                                                                                                 let update_len = byte_utils::slice_to_be16(&err_packet.failuremsg[2..4]) as usize;
1741                                                                                                 if err_packet.failuremsg.len() >= 4 + update_len {
1742                                                                                                         if let Ok(chan_update) = msgs::ChannelUpdate::decode(&err_packet.failuremsg[4..4 + update_len]) {
1743                                                                                                                 res = Some(msgs::HTLCFailChannelUpdate::ChannelUpdateMessage {
1744                                                                                                                         msg: chan_update,
1745                                                                                                                 });
1746                                                                                                         }
1747                                                                                                 }
1748                                                                                         }
1749                                                                                 },
1750                                                                                 UNKNOWN_CHAN => {
1751                                                                                         // No such next-hop. We know this came from the
1752                                                                                         // current node as the HMAC validated.
1753                                                                                         res = Some(msgs::HTLCFailChannelUpdate::ChannelClosed {
1754                                                                                                 short_channel_id: route_hop.short_channel_id
1755                                                                                         });
1756                                                                                 },
1757                                                                                 _ => {}, //TODO: Enumerate all of these!
1758                                                                         }
1759                                                                 }
1760                                                         }
1761                                                 }
1762                                         }).unwrap();
1763                                         Ok(res)
1764                                 },
1765                                 _ => { Ok(None) },
1766                         }
1767                 } else {
1768                         Ok(None)
1769                 }
1770         }
1771
1772         fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) -> Result<(), HandleError> {
1773                 let mut channel_state = self.channel_state.lock().unwrap();
1774                 match channel_state.by_id.get_mut(&msg.channel_id) {
1775                         Some(chan) => {
1776                                 if chan.get_their_node_id() != *their_node_id {
1777                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1778                                 }
1779                                 chan.update_fail_malformed_htlc(&msg, HTLCFailReason::Reason { failure_code: msg.failure_code, data: Vec::new() })
1780                         },
1781                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1782                 }
1783         }
1784
1785         fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>), HandleError> {
1786                 let (revoke_and_ack, commitment_signed, chan_monitor) = {
1787                         let mut channel_state = self.channel_state.lock().unwrap();
1788                         match channel_state.by_id.get_mut(&msg.channel_id) {
1789                                 Some(chan) => {
1790                                         if chan.get_their_node_id() != *their_node_id {
1791                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1792                                         }
1793                                         chan.commitment_signed(&msg)?
1794                                 },
1795                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1796                         }
1797                 };
1798                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1799                         unimplemented!();
1800                 }
1801
1802                 Ok((revoke_and_ack, commitment_signed))
1803         }
1804
1805         fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) -> Result<Option<msgs::CommitmentUpdate>, HandleError> {
1806                 let (res, mut pending_forwards, mut pending_failures, chan_monitor) = {
1807                         let mut channel_state = self.channel_state.lock().unwrap();
1808                         match channel_state.by_id.get_mut(&msg.channel_id) {
1809                                 Some(chan) => {
1810                                         if chan.get_their_node_id() != *their_node_id {
1811                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1812                                         }
1813                                         chan.revoke_and_ack(&msg)?
1814                                 },
1815                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1816                         }
1817                 };
1818                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1819                         unimplemented!();
1820                 }
1821                 for failure in pending_failures.drain(..) {
1822                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &failure.0, failure.1);
1823                 }
1824
1825                 let mut forward_event = None;
1826                 if !pending_forwards.is_empty() {
1827                         let mut channel_state = self.channel_state.lock().unwrap();
1828                         if channel_state.forward_htlcs.is_empty() {
1829                                 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));
1830                                 channel_state.next_forward = forward_event.unwrap();
1831                         }
1832                         for forward_info in pending_forwards.drain(..) {
1833                                 match channel_state.forward_htlcs.entry(forward_info.short_channel_id) {
1834                                         hash_map::Entry::Occupied(mut entry) => {
1835                                                 entry.get_mut().push(forward_info);
1836                                         },
1837                                         hash_map::Entry::Vacant(entry) => {
1838                                                 entry.insert(vec!(forward_info));
1839                                         }
1840                                 }
1841                         }
1842                 }
1843                 match forward_event {
1844                         Some(time) => {
1845                                 let mut pending_events = self.pending_events.lock().unwrap();
1846                                 pending_events.push(events::Event::PendingHTLCsForwardable {
1847                                         time_forwardable: time
1848                                 });
1849                         }
1850                         None => {},
1851                 }
1852
1853                 Ok(res)
1854         }
1855
1856         fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) -> Result<(), HandleError> {
1857                 let mut channel_state = self.channel_state.lock().unwrap();
1858                 match channel_state.by_id.get_mut(&msg.channel_id) {
1859                         Some(chan) => {
1860                                 if chan.get_their_node_id() != *their_node_id {
1861                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1862                                 }
1863                                 chan.update_fee(&*self.fee_estimator, &msg)
1864                         },
1865                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1866                 }
1867         }
1868
1869         fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) -> Result<(), HandleError> {
1870                 let (chan_announcement, chan_update) = {
1871                         let mut channel_state = self.channel_state.lock().unwrap();
1872                         match channel_state.by_id.get_mut(&msg.channel_id) {
1873                                 Some(chan) => {
1874                                         if chan.get_their_node_id() != *their_node_id {
1875                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1876                                         }
1877                                         if !chan.is_usable() {
1878                                                 return Err(HandleError{err: "Got an announcement_signatures before we were ready for it", action: None });
1879                                         }
1880
1881                                         let our_node_id = self.get_our_node_id();
1882                                         let (announcement, our_bitcoin_sig) = chan.get_channel_announcement(our_node_id.clone(), self.genesis_hash.clone())?;
1883
1884                                         let were_node_one = announcement.node_id_1 == our_node_id;
1885                                         let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
1886                                         secp_call!(self.secp_ctx.verify(&msghash, &msg.node_signature, if were_node_one { &announcement.node_id_2 } else { &announcement.node_id_1 }));
1887                                         secp_call!(self.secp_ctx.verify(&msghash, &msg.bitcoin_signature, if were_node_one { &announcement.bitcoin_key_2 } else { &announcement.bitcoin_key_1 }));
1888
1889                                         let our_node_sig = secp_call!(self.secp_ctx.sign(&msghash, &self.our_network_key));
1890
1891                                         (msgs::ChannelAnnouncement {
1892                                                 node_signature_1: if were_node_one { our_node_sig } else { msg.node_signature },
1893                                                 node_signature_2: if were_node_one { msg.node_signature } else { our_node_sig },
1894                                                 bitcoin_signature_1: if were_node_one { our_bitcoin_sig } else { msg.bitcoin_signature },
1895                                                 bitcoin_signature_2: if were_node_one { msg.bitcoin_signature } else { our_bitcoin_sig },
1896                                                 contents: announcement,
1897                                         }, self.get_channel_update(chan).unwrap()) // can only fail if we're not in a ready state
1898                                 },
1899                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1900                         }
1901                 };
1902                 let mut pending_events = self.pending_events.lock().unwrap();
1903                 pending_events.push(events::Event::BroadcastChannelAnnouncement { msg: chan_announcement, update_msg: chan_update });
1904                 Ok(())
1905         }
1906
1907         fn peer_disconnected(&self, their_node_id: &PublicKey, no_connection_possible: bool) {
1908                 let mut new_events = Vec::new();
1909                 let mut failed_channels = Vec::new();
1910                 {
1911                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1912                         let channel_state = channel_state_lock.borrow_parts();
1913                         let short_to_id = channel_state.short_to_id;
1914                         if no_connection_possible {
1915                                 channel_state.by_id.retain(|_, chan| {
1916                                         if chan.get_their_node_id() == *their_node_id {
1917                                                 if let Some(short_id) = chan.get_short_channel_id() {
1918                                                         short_to_id.remove(&short_id);
1919                                                 }
1920                                                 failed_channels.push(chan.force_shutdown());
1921                                                 if let Ok(update) = self.get_channel_update(&chan) {
1922                                                         new_events.push(events::Event::BroadcastChannelUpdate {
1923                                                                 msg: update
1924                                                         });
1925                                                 }
1926                                                 false
1927                                         } else {
1928                                                 true
1929                                         }
1930                                 });
1931                         } else {
1932                                 for chan in channel_state.by_id {
1933                                         if chan.1.get_their_node_id() == *their_node_id {
1934                                                 //TODO: mark channel disabled (and maybe announce such after a timeout). Also
1935                                                 //fail and wipe any uncommitted outbound HTLCs as those are considered after
1936                                                 //reconnect.
1937                                         }
1938                                 }
1939                         }
1940                 }
1941                 for failure in failed_channels.drain(..) {
1942                         self.finish_force_close_channel(failure);
1943                 }
1944                 if !new_events.is_empty() {
1945                         let mut pending_events = self.pending_events.lock().unwrap();
1946                         for event in new_events.drain(..) {
1947                                 pending_events.push(event);
1948                         }
1949                 }
1950         }
1951 }
1952
1953 #[cfg(test)]
1954 mod tests {
1955         use chain::chaininterface;
1956         use chain::transaction::OutPoint;
1957         use chain::chaininterface::ChainListener;
1958         use ln::channelmanager::{ChannelManager,OnionKeys};
1959         use ln::router::{Route, RouteHop, Router};
1960         use ln::msgs;
1961         use ln::msgs::{MsgEncodable,ChannelMessageHandler,RoutingMessageHandler};
1962         use util::test_utils;
1963         use util::events::{Event, EventsProvider};
1964
1965         use bitcoin::util::hash::Sha256dHash;
1966         use bitcoin::blockdata::block::{Block, BlockHeader};
1967         use bitcoin::blockdata::transaction::{Transaction, TxOut};
1968         use bitcoin::network::constants::Network;
1969         use bitcoin::network::serialize::serialize;
1970         use bitcoin::network::serialize::BitcoinHash;
1971
1972         use hex;
1973
1974         use secp256k1::Secp256k1;
1975         use secp256k1::key::{PublicKey,SecretKey};
1976
1977         use crypto::sha2::Sha256;
1978         use crypto::digest::Digest;
1979
1980         use rand::{thread_rng,Rng};
1981
1982         use std::collections::HashMap;
1983         use std::default::Default;
1984         use std::sync::{Arc, Mutex};
1985         use std::time::Instant;
1986         use std::mem;
1987
1988         fn build_test_onion_keys() -> Vec<OnionKeys> {
1989                 // Keys from BOLT 4, used in both test vector tests
1990                 let secp_ctx = Secp256k1::new();
1991
1992                 let route = Route {
1993                         hops: vec!(
1994                                         RouteHop {
1995                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]).unwrap(),
1996                                                 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
1997                                         },
1998                                         RouteHop {
1999                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("0324653eac434488002cc06bbfb7f10fe18991e35f9fe4302dbea6d2353dc0ab1c").unwrap()[..]).unwrap(),
2000                                                 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
2001                                         },
2002                                         RouteHop {
2003                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("027f31ebc5462c1fdce1b737ecff52d37d75dea43ce11c74d25aa297165faa2007").unwrap()[..]).unwrap(),
2004                                                 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
2005                                         },
2006                                         RouteHop {
2007                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]).unwrap(),
2008                                                 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
2009                                         },
2010                                         RouteHop {
2011                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("02edabbd16b41c8371b92ef2f04c1185b4f03b6dcd52ba9b78d9d7c89c8f221145").unwrap()[..]).unwrap(),
2012                                                 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
2013                                         },
2014                         ),
2015                 };
2016
2017                 let session_priv = SecretKey::from_slice(&secp_ctx, &hex::decode("4141414141414141414141414141414141414141414141414141414141414141").unwrap()[..]).unwrap();
2018
2019                 let onion_keys = ChannelManager::construct_onion_keys(&secp_ctx, &route, &session_priv).unwrap();
2020                 assert_eq!(onion_keys.len(), route.hops.len());
2021                 onion_keys
2022         }
2023
2024         #[test]
2025         fn onion_vectors() {
2026                 // Packet creation test vectors from BOLT 4
2027                 let onion_keys = build_test_onion_keys();
2028
2029                 assert_eq!(onion_keys[0].shared_secret[..], hex::decode("53eb63ea8a3fec3b3cd433b85cd62a4b145e1dda09391b348c4e1cd36a03ea66").unwrap()[..]);
2030                 assert_eq!(onion_keys[0].blinding_factor[..], hex::decode("2ec2e5da605776054187180343287683aa6a51b4b1c04d6dd49c45d8cffb3c36").unwrap()[..]);
2031                 assert_eq!(onion_keys[0].ephemeral_pubkey.serialize()[..], hex::decode("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]);
2032                 assert_eq!(onion_keys[0].rho, hex::decode("ce496ec94def95aadd4bec15cdb41a740c9f2b62347c4917325fcc6fb0453986").unwrap()[..]);
2033                 assert_eq!(onion_keys[0].mu, hex::decode("b57061dc6d0a2b9f261ac410c8b26d64ac5506cbba30267a649c28c179400eba").unwrap()[..]);
2034
2035                 assert_eq!(onion_keys[1].shared_secret[..], hex::decode("a6519e98832a0b179f62123b3567c106db99ee37bef036e783263602f3488fae").unwrap()[..]);
2036                 assert_eq!(onion_keys[1].blinding_factor[..], hex::decode("bf66c28bc22e598cfd574a1931a2bafbca09163df2261e6d0056b2610dab938f").unwrap()[..]);
2037                 assert_eq!(onion_keys[1].ephemeral_pubkey.serialize()[..], hex::decode("028f9438bfbf7feac2e108d677e3a82da596be706cc1cf342b75c7b7e22bf4e6e2").unwrap()[..]);
2038                 assert_eq!(onion_keys[1].rho, hex::decode("450ffcabc6449094918ebe13d4f03e433d20a3d28a768203337bc40b6e4b2c59").unwrap()[..]);
2039                 assert_eq!(onion_keys[1].mu, hex::decode("05ed2b4a3fb023c2ff5dd6ed4b9b6ea7383f5cfe9d59c11d121ec2c81ca2eea9").unwrap()[..]);
2040
2041                 assert_eq!(onion_keys[2].shared_secret[..], hex::decode("3a6b412548762f0dbccce5c7ae7bb8147d1caf9b5471c34120b30bc9c04891cc").unwrap()[..]);
2042                 assert_eq!(onion_keys[2].blinding_factor[..], hex::decode("a1f2dadd184eb1627049673f18c6325814384facdee5bfd935d9cb031a1698a5").unwrap()[..]);
2043                 assert_eq!(onion_keys[2].ephemeral_pubkey.serialize()[..], hex::decode("03bfd8225241ea71cd0843db7709f4c222f62ff2d4516fd38b39914ab6b83e0da0").unwrap()[..]);
2044                 assert_eq!(onion_keys[2].rho, hex::decode("11bf5c4f960239cb37833936aa3d02cea82c0f39fd35f566109c41f9eac8deea").unwrap()[..]);
2045                 assert_eq!(onion_keys[2].mu, hex::decode("caafe2820fa00eb2eeb78695ae452eba38f5a53ed6d53518c5c6edf76f3f5b78").unwrap()[..]);
2046
2047                 assert_eq!(onion_keys[3].shared_secret[..], hex::decode("21e13c2d7cfe7e18836df50872466117a295783ab8aab0e7ecc8c725503ad02d").unwrap()[..]);
2048                 assert_eq!(onion_keys[3].blinding_factor[..], hex::decode("7cfe0b699f35525029ae0fa437c69d0f20f7ed4e3916133f9cacbb13c82ff262").unwrap()[..]);
2049                 assert_eq!(onion_keys[3].ephemeral_pubkey.serialize()[..], hex::decode("031dde6926381289671300239ea8e57ffaf9bebd05b9a5b95beaf07af05cd43595").unwrap()[..]);
2050                 assert_eq!(onion_keys[3].rho, hex::decode("cbe784ab745c13ff5cffc2fbe3e84424aa0fd669b8ead4ee562901a4a4e89e9e").unwrap()[..]);
2051                 assert_eq!(onion_keys[3].mu, hex::decode("5052aa1b3d9f0655a0932e50d42f0c9ba0705142c25d225515c45f47c0036ee9").unwrap()[..]);
2052
2053                 assert_eq!(onion_keys[4].shared_secret[..], hex::decode("b5756b9b542727dbafc6765a49488b023a725d631af688fc031217e90770c328").unwrap()[..]);
2054                 assert_eq!(onion_keys[4].blinding_factor[..], hex::decode("c96e00dddaf57e7edcd4fb5954be5b65b09f17cb6d20651b4e90315be5779205").unwrap()[..]);
2055                 assert_eq!(onion_keys[4].ephemeral_pubkey.serialize()[..], hex::decode("03a214ebd875aab6ddfd77f22c5e7311d7f77f17a169e599f157bbcdae8bf071f4").unwrap()[..]);
2056                 assert_eq!(onion_keys[4].rho, hex::decode("034e18b8cc718e8af6339106e706c52d8df89e2b1f7e9142d996acf88df8799b").unwrap()[..]);
2057                 assert_eq!(onion_keys[4].mu, hex::decode("8e45e5c61c2b24cb6382444db6698727afb063adecd72aada233d4bf273d975a").unwrap()[..]);
2058
2059                 // Test vectors below are flat-out wrong: they claim to set outgoing_cltv_value to non-0 :/
2060                 let payloads = vec!(
2061                         msgs::OnionHopData {
2062                                 realm: 0,
2063                                 data: msgs::OnionRealm0HopData {
2064                                         short_channel_id: 0,
2065                                         amt_to_forward: 0,
2066                                         outgoing_cltv_value: 0,
2067                                 },
2068                                 hmac: [0; 32],
2069                         },
2070                         msgs::OnionHopData {
2071                                 realm: 0,
2072                                 data: msgs::OnionRealm0HopData {
2073                                         short_channel_id: 0x0101010101010101,
2074                                         amt_to_forward: 0x0100000001,
2075                                         outgoing_cltv_value: 0,
2076                                 },
2077                                 hmac: [0; 32],
2078                         },
2079                         msgs::OnionHopData {
2080                                 realm: 0,
2081                                 data: msgs::OnionRealm0HopData {
2082                                         short_channel_id: 0x0202020202020202,
2083                                         amt_to_forward: 0x0200000002,
2084                                         outgoing_cltv_value: 0,
2085                                 },
2086                                 hmac: [0; 32],
2087                         },
2088                         msgs::OnionHopData {
2089                                 realm: 0,
2090                                 data: msgs::OnionRealm0HopData {
2091                                         short_channel_id: 0x0303030303030303,
2092                                         amt_to_forward: 0x0300000003,
2093                                         outgoing_cltv_value: 0,
2094                                 },
2095                                 hmac: [0; 32],
2096                         },
2097                         msgs::OnionHopData {
2098                                 realm: 0,
2099                                 data: msgs::OnionRealm0HopData {
2100                                         short_channel_id: 0x0404040404040404,
2101                                         amt_to_forward: 0x0400000004,
2102                                         outgoing_cltv_value: 0,
2103                                 },
2104                                 hmac: [0; 32],
2105                         },
2106                 );
2107
2108                 let packet = ChannelManager::construct_onion_packet(payloads, onion_keys, &[0x42; 32]).unwrap();
2109                 // Just check the final packet encoding, as it includes all the per-hop vectors in it
2110                 // anyway...
2111                 assert_eq!(packet.encode(), hex::decode("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").unwrap());
2112         }
2113
2114         #[test]
2115         fn test_failure_packet_onion() {
2116                 // Returning Errors test vectors from BOLT 4
2117
2118                 let onion_keys = build_test_onion_keys();
2119                 let onion_error = ChannelManager::build_failure_packet(&onion_keys[4].shared_secret, 0x2002, &[0; 0]);
2120                 assert_eq!(onion_error.encode(), hex::decode("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").unwrap());
2121
2122                 let onion_packet_1 = ChannelManager::encrypt_failure_packet(&onion_keys[4].shared_secret, &onion_error.encode()[..]);
2123                 assert_eq!(onion_packet_1.data, hex::decode("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").unwrap());
2124
2125                 let onion_packet_2 = ChannelManager::encrypt_failure_packet(&onion_keys[3].shared_secret, &onion_packet_1.data[..]);
2126                 assert_eq!(onion_packet_2.data, hex::decode("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").unwrap());
2127
2128                 let onion_packet_3 = ChannelManager::encrypt_failure_packet(&onion_keys[2].shared_secret, &onion_packet_2.data[..]);
2129                 assert_eq!(onion_packet_3.data, hex::decode("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").unwrap());
2130
2131                 let onion_packet_4 = ChannelManager::encrypt_failure_packet(&onion_keys[1].shared_secret, &onion_packet_3.data[..]);
2132                 assert_eq!(onion_packet_4.data, hex::decode("aac3200c4968f56b21f53e5e374e3a2383ad2b1b6501bbcc45abc31e59b26881b7dfadbb56ec8dae8857add94e6702fb4c3a4de22e2e669e1ed926b04447fc73034bb730f4932acd62727b75348a648a1128744657ca6a4e713b9b646c3ca66cac02cdab44dd3439890ef3aaf61708714f7375349b8da541b2548d452d84de7084bb95b3ac2345201d624d31f4d52078aa0fa05a88b4e20202bd2b86ac5b52919ea305a8949de95e935eed0319cf3cf19ebea61d76ba92532497fcdc9411d06bcd4275094d0a4a3c5d3a945e43305a5a9256e333e1f64dbca5fcd4e03a39b9012d197506e06f29339dfee3331995b21615337ae060233d39befea925cc262873e0530408e6990f1cbd233a150ef7b004ff6166c70c68d9f8c853c1abca640b8660db2921").unwrap());
2133
2134                 let onion_packet_5 = ChannelManager::encrypt_failure_packet(&onion_keys[0].shared_secret, &onion_packet_4.data[..]);
2135                 assert_eq!(onion_packet_5.data, hex::decode("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").unwrap());
2136         }
2137
2138         fn confirm_transaction(chain: &chaininterface::ChainWatchInterfaceUtil, tx: &Transaction, chan_id: u32) {
2139                 assert!(chain.does_match_tx(tx));
2140                 let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2141                 chain.block_connected_checked(&header, 1, &[tx; 1], &[chan_id; 1]);
2142                 for i in 2..100 {
2143                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2144                         chain.block_connected_checked(&header, i, &[tx; 0], &[0; 0]);
2145                 }
2146         }
2147
2148         struct Node {
2149                 feeest: Arc<test_utils::TestFeeEstimator>,
2150                 chain_monitor: Arc<chaininterface::ChainWatchInterfaceUtil>,
2151                 tx_broadcaster: Arc<test_utils::TestBroadcaster>,
2152                 chan_monitor: Arc<test_utils::TestChannelMonitor>,
2153                 node_id: SecretKey,
2154                 node: Arc<ChannelManager>,
2155                 router: Router,
2156         }
2157
2158         static mut CHAN_COUNT: u32 = 0;
2159         fn create_chan_between_nodes(node_a: &Node, node_b: &Node) -> (msgs::ChannelAnnouncement, msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction) {
2160                 node_a.node.create_channel(node_b.node.get_our_node_id(), 100000, 42).unwrap();
2161
2162                 let events_1 = node_a.node.get_and_clear_pending_events();
2163                 assert_eq!(events_1.len(), 1);
2164                 let accept_chan = match events_1[0] {
2165                         Event::SendOpenChannel { ref node_id, ref msg } => {
2166                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2167                                 node_b.node.handle_open_channel(&node_a.node.get_our_node_id(), msg).unwrap()
2168                         },
2169                         _ => panic!("Unexpected event"),
2170                 };
2171
2172                 node_a.node.handle_accept_channel(&node_b.node.get_our_node_id(), &accept_chan).unwrap();
2173
2174                 let chan_id = unsafe { CHAN_COUNT };
2175                 let tx;
2176                 let funding_output;
2177
2178                 let events_2 = node_a.node.get_and_clear_pending_events();
2179                 assert_eq!(events_2.len(), 1);
2180                 match events_2[0] {
2181                         Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, user_channel_id } => {
2182                                 assert_eq!(*channel_value_satoshis, 100000);
2183                                 assert_eq!(user_channel_id, 42);
2184
2185                                 tx = Transaction { version: chan_id as u32, lock_time: 0, input: Vec::new(), output: vec![TxOut {
2186                                         value: *channel_value_satoshis, script_pubkey: output_script.clone(),
2187                                 }]};
2188                                 funding_output = OutPoint::new(Sha256dHash::from_data(&serialize(&tx).unwrap()[..]), 0);
2189
2190                                 node_a.node.funding_transaction_generated(&temporary_channel_id, funding_output);
2191                                 let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
2192                                 assert_eq!(added_monitors.len(), 1);
2193                                 assert_eq!(added_monitors[0].0, funding_output);
2194                                 added_monitors.clear();
2195                         },
2196                         _ => panic!("Unexpected event"),
2197                 }
2198
2199                 let events_3 = node_a.node.get_and_clear_pending_events();
2200                 assert_eq!(events_3.len(), 1);
2201                 let funding_signed = match events_3[0] {
2202                         Event::SendFundingCreated { ref node_id, ref msg } => {
2203                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2204                                 let res = node_b.node.handle_funding_created(&node_a.node.get_our_node_id(), msg).unwrap();
2205                                 let mut added_monitors = node_b.chan_monitor.added_monitors.lock().unwrap();
2206                                 assert_eq!(added_monitors.len(), 1);
2207                                 assert_eq!(added_monitors[0].0, funding_output);
2208                                 added_monitors.clear();
2209                                 res
2210                         },
2211                         _ => panic!("Unexpected event"),
2212                 };
2213
2214                 node_a.node.handle_funding_signed(&node_b.node.get_our_node_id(), &funding_signed).unwrap();
2215                 {
2216                         let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
2217                         assert_eq!(added_monitors.len(), 1);
2218                         assert_eq!(added_monitors[0].0, funding_output);
2219                         added_monitors.clear();
2220                 }
2221
2222                 let events_4 = node_a.node.get_and_clear_pending_events();
2223                 assert_eq!(events_4.len(), 1);
2224                 match events_4[0] {
2225                         Event::FundingBroadcastSafe { ref funding_txo, user_channel_id } => {
2226                                 assert_eq!(user_channel_id, 42);
2227                                 assert_eq!(*funding_txo, funding_output);
2228                         },
2229                         _ => panic!("Unexpected event"),
2230                 };
2231
2232                 confirm_transaction(&node_a.chain_monitor, &tx, chan_id);
2233                 let events_5 = node_a.node.get_and_clear_pending_events();
2234                 assert_eq!(events_5.len(), 1);
2235                 match events_5[0] {
2236                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
2237                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2238                                 assert!(announcement_sigs.is_none());
2239                                 node_b.node.handle_funding_locked(&node_a.node.get_our_node_id(), msg).unwrap()
2240                         },
2241                         _ => panic!("Unexpected event"),
2242                 };
2243
2244                 let channel_id;
2245
2246                 confirm_transaction(&node_b.chain_monitor, &tx, chan_id);
2247                 let events_6 = node_b.node.get_and_clear_pending_events();
2248                 assert_eq!(events_6.len(), 1);
2249                 let as_announcement_sigs = match events_6[0] {
2250                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
2251                                 assert_eq!(*node_id, node_a.node.get_our_node_id());
2252                                 channel_id = msg.channel_id.clone();
2253                                 let as_announcement_sigs = node_a.node.handle_funding_locked(&node_b.node.get_our_node_id(), msg).unwrap().unwrap();
2254                                 node_a.node.handle_announcement_signatures(&node_b.node.get_our_node_id(), &(*announcement_sigs).clone().unwrap()).unwrap();
2255                                 as_announcement_sigs
2256                         },
2257                         _ => panic!("Unexpected event"),
2258                 };
2259
2260                 let events_7 = node_a.node.get_and_clear_pending_events();
2261                 assert_eq!(events_7.len(), 1);
2262                 let (announcement, as_update) = match events_7[0] {
2263                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
2264                                 (msg, update_msg)
2265                         },
2266                         _ => panic!("Unexpected event"),
2267                 };
2268
2269                 node_b.node.handle_announcement_signatures(&node_a.node.get_our_node_id(), &as_announcement_sigs).unwrap();
2270                 let events_8 = node_b.node.get_and_clear_pending_events();
2271                 assert_eq!(events_8.len(), 1);
2272                 let bs_update = match events_8[0] {
2273                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
2274                                 assert!(*announcement == *msg);
2275                                 update_msg
2276                         },
2277                         _ => panic!("Unexpected event"),
2278                 };
2279
2280                 unsafe {
2281                         CHAN_COUNT += 1;
2282                 }
2283
2284                 ((*announcement).clone(), (*as_update).clone(), (*bs_update).clone(), channel_id, tx)
2285         }
2286
2287         fn create_announced_chan_between_nodes(nodes: &Vec<Node>, a: usize, b: usize) -> (msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction) {
2288                 let chan_announcement = create_chan_between_nodes(&nodes[a], &nodes[b]);
2289                 for node in nodes {
2290                         assert!(node.router.handle_channel_announcement(&chan_announcement.0).unwrap());
2291                         node.router.handle_channel_update(&chan_announcement.1).unwrap();
2292                         node.router.handle_channel_update(&chan_announcement.2).unwrap();
2293                 }
2294                 (chan_announcement.1, chan_announcement.2, chan_announcement.3, chan_announcement.4)
2295         }
2296
2297         fn close_channel(outbound_node: &Node, inbound_node: &Node, channel_id: &[u8; 32], funding_tx: Transaction, close_inbound_first: bool) -> (msgs::ChannelUpdate, msgs::ChannelUpdate) {
2298                 let (node_a, broadcaster_a) = if close_inbound_first { (&inbound_node.node, &inbound_node.tx_broadcaster) } else { (&outbound_node.node, &outbound_node.tx_broadcaster) };
2299                 let (node_b, broadcaster_b) = if close_inbound_first { (&outbound_node.node, &outbound_node.tx_broadcaster) } else { (&inbound_node.node, &inbound_node.tx_broadcaster) };
2300                 let (tx_a, tx_b);
2301
2302                 node_a.close_channel(channel_id).unwrap();
2303                 let events_1 = node_a.get_and_clear_pending_events();
2304                 assert_eq!(events_1.len(), 1);
2305                 let shutdown_a = match events_1[0] {
2306                         Event::SendShutdown { ref node_id, ref msg } => {
2307                                 assert_eq!(node_id, &node_b.get_our_node_id());
2308                                 msg.clone()
2309                         },
2310                         _ => panic!("Unexpected event"),
2311                 };
2312
2313                 let (shutdown_b, mut closing_signed_b) = node_b.handle_shutdown(&node_a.get_our_node_id(), &shutdown_a).unwrap();
2314                 if !close_inbound_first {
2315                         assert!(closing_signed_b.is_none());
2316                 }
2317                 let (empty_a, mut closing_signed_a) = node_a.handle_shutdown(&node_b.get_our_node_id(), &shutdown_b.unwrap()).unwrap();
2318                 assert!(empty_a.is_none());
2319                 if close_inbound_first {
2320                         assert!(closing_signed_a.is_none());
2321                         closing_signed_a = node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
2322                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
2323                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
2324
2325                         let empty_b = node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
2326                         assert!(empty_b.is_none());
2327                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
2328                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
2329                 } else {
2330                         closing_signed_b = node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
2331                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
2332                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
2333
2334                         let empty_a2 = node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
2335                         assert!(empty_a2.is_none());
2336                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
2337                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
2338                 }
2339                 assert_eq!(tx_a, tx_b);
2340                 let mut funding_tx_map = HashMap::new();
2341                 funding_tx_map.insert(funding_tx.txid(), funding_tx);
2342                 tx_a.verify(&funding_tx_map).unwrap();
2343
2344                 let events_2 = node_a.get_and_clear_pending_events();
2345                 assert_eq!(events_2.len(), 1);
2346                 let as_update = match events_2[0] {
2347                         Event::BroadcastChannelUpdate { ref msg } => {
2348                                 msg.clone()
2349                         },
2350                         _ => panic!("Unexpected event"),
2351                 };
2352
2353                 let events_3 = node_b.get_and_clear_pending_events();
2354                 assert_eq!(events_3.len(), 1);
2355                 let bs_update = match events_3[0] {
2356                         Event::BroadcastChannelUpdate { ref msg } => {
2357                                 msg.clone()
2358                         },
2359                         _ => panic!("Unexpected event"),
2360                 };
2361
2362                 (as_update, bs_update)
2363         }
2364
2365         struct SendEvent {
2366                 node_id: PublicKey,
2367                 msgs: Vec<msgs::UpdateAddHTLC>,
2368                 commitment_msg: msgs::CommitmentSigned,
2369         }
2370         impl SendEvent {
2371                 fn from_event(event: Event) -> SendEvent {
2372                         match event {
2373                                 Event::SendHTLCs { node_id, msgs, commitment_msg } => {
2374                                         SendEvent { node_id: node_id, msgs: msgs, commitment_msg: commitment_msg }
2375                                 },
2376                                 _ => panic!("Unexpected event type!"),
2377                         }
2378                 }
2379         }
2380
2381         static mut PAYMENT_COUNT: u8 = 0;
2382         fn send_along_route(origin_node: &Node, route: Route, expected_route: &[&Node], recv_value: u64) -> ([u8; 32], [u8; 32]) {
2383                 let our_payment_preimage = unsafe { [PAYMENT_COUNT; 32] };
2384                 unsafe { PAYMENT_COUNT += 1 };
2385                 let our_payment_hash = {
2386                         let mut sha = Sha256::new();
2387                         sha.input(&our_payment_preimage[..]);
2388                         let mut ret = [0; 32];
2389                         sha.result(&mut ret);
2390                         ret
2391                 };
2392
2393                 let mut payment_event = {
2394                         origin_node.node.send_payment(route, our_payment_hash).unwrap();
2395                         {
2396                                 let mut added_monitors = origin_node.chan_monitor.added_monitors.lock().unwrap();
2397                                 assert_eq!(added_monitors.len(), 1);
2398                                 added_monitors.clear();
2399                         }
2400
2401                         let mut events = origin_node.node.get_and_clear_pending_events();
2402                         assert_eq!(events.len(), 1);
2403                         SendEvent::from_event(events.remove(0))
2404                 };
2405                 let mut prev_node = origin_node;
2406
2407                 for (idx, &node) in expected_route.iter().enumerate() {
2408                         assert_eq!(node.node.get_our_node_id(), payment_event.node_id);
2409
2410                         node.node.handle_update_add_htlc(&prev_node.node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
2411                         {
2412                                 let added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2413                                 assert_eq!(added_monitors.len(), 0);
2414                         }
2415
2416                         let revoke_and_ack = node.node.handle_commitment_signed(&prev_node.node.get_our_node_id(), &payment_event.commitment_msg).unwrap();
2417                         {
2418                                 let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2419                                 assert_eq!(added_monitors.len(), 1);
2420                                 added_monitors.clear();
2421                         }
2422                         assert!(prev_node.node.handle_revoke_and_ack(&node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2423                         let prev_revoke_and_ack = prev_node.node.handle_commitment_signed(&node.node.get_our_node_id(), &revoke_and_ack.1.unwrap()).unwrap();
2424                         {
2425                                 let mut added_monitors = prev_node.chan_monitor.added_monitors.lock().unwrap();
2426                                 assert_eq!(added_monitors.len(), 2);
2427                                 added_monitors.clear();
2428                         }
2429                         assert!(node.node.handle_revoke_and_ack(&prev_node.node.get_our_node_id(), &prev_revoke_and_ack.0).unwrap().is_none());
2430                         assert!(prev_revoke_and_ack.1.is_none());
2431                         {
2432                                 let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2433                                 assert_eq!(added_monitors.len(), 1);
2434                                 added_monitors.clear();
2435                         }
2436
2437                         let events_1 = node.node.get_and_clear_pending_events();
2438                         assert_eq!(events_1.len(), 1);
2439                         match events_1[0] {
2440                                 Event::PendingHTLCsForwardable { .. } => { },
2441                                 _ => panic!("Unexpected event"),
2442                         };
2443
2444                         node.node.channel_state.lock().unwrap().next_forward = Instant::now();
2445                         node.node.process_pending_htlc_forwards();
2446
2447                         let mut events_2 = node.node.get_and_clear_pending_events();
2448                         assert_eq!(events_2.len(), 1);
2449                         if idx == expected_route.len() - 1 {
2450                                 match events_2[0] {
2451                                         Event::PaymentReceived { ref payment_hash, amt } => {
2452                                                 assert_eq!(our_payment_hash, *payment_hash);
2453                                                 assert_eq!(amt, recv_value);
2454                                         },
2455                                         _ => panic!("Unexpected event"),
2456                                 }
2457                         } else {
2458                                 {
2459                                         let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2460                                         assert_eq!(added_monitors.len(), 1);
2461                                         added_monitors.clear();
2462                                 }
2463                                 payment_event = SendEvent::from_event(events_2.remove(0));
2464                                 assert_eq!(payment_event.msgs.len(), 1);
2465                         }
2466
2467                         prev_node = node;
2468                 }
2469
2470                 (our_payment_preimage, our_payment_hash)
2471         }
2472
2473         fn claim_payment(origin_node: &Node, expected_route: &[&Node], our_payment_preimage: [u8; 32]) {
2474                 assert!(expected_route.last().unwrap().node.claim_funds(our_payment_preimage));
2475                 {
2476                         let mut added_monitors = expected_route.last().unwrap().chan_monitor.added_monitors.lock().unwrap();
2477                         assert_eq!(added_monitors.len(), 1);
2478                         added_monitors.clear();
2479                 }
2480
2481                 let mut next_msgs: Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned)> = None;
2482                 macro_rules! update_fulfill_dance {
2483                         ($node: expr, $prev_node: expr, $last_node: expr) => {
2484                                 {
2485                                         $node.node.handle_update_fulfill_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
2486                                         {
2487                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2488                                                 if $last_node {
2489                                                         assert_eq!(added_monitors.len(), 0);
2490                                                 } else {
2491                                                         assert_eq!(added_monitors.len(), 1);
2492                                                 }
2493                                                 added_monitors.clear();
2494                                         }
2495                                         let revoke_and_commit = $node.node.handle_commitment_signed(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().1).unwrap();
2496                                         {
2497                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2498                                                 assert_eq!(added_monitors.len(), 1);
2499                                                 added_monitors.clear();
2500                                         }
2501                                         assert!($prev_node.node.handle_revoke_and_ack(&$node.node.get_our_node_id(), &revoke_and_commit.0).unwrap().is_none());
2502                                         let revoke_and_ack = $prev_node.node.handle_commitment_signed(&$node.node.get_our_node_id(), &revoke_and_commit.1.unwrap()).unwrap();
2503                                         assert!(revoke_and_ack.1.is_none());
2504                                         {
2505                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2506                                                 assert_eq!(added_monitors.len(), 2);
2507                                                 added_monitors.clear();
2508                                         }
2509                                         assert!($node.node.handle_revoke_and_ack(&$prev_node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2510                                         {
2511                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2512                                                 assert_eq!(added_monitors.len(), 1);
2513                                                 added_monitors.clear();
2514                                         }
2515                                 }
2516                         }
2517                 }
2518
2519                 let mut expected_next_node = expected_route.last().unwrap().node.get_our_node_id();
2520                 let mut prev_node = expected_route.last().unwrap();
2521                 for node in expected_route.iter().rev() {
2522                         assert_eq!(expected_next_node, node.node.get_our_node_id());
2523                         if next_msgs.is_some() {
2524                                 update_fulfill_dance!(node, prev_node, false);
2525                         }
2526
2527                         let events = node.node.get_and_clear_pending_events();
2528                         assert_eq!(events.len(), 1);
2529                         match events[0] {
2530                                 Event::SendFulfillHTLC { ref node_id, ref msg, ref commitment_msg } => {
2531                                         expected_next_node = node_id.clone();
2532                                         next_msgs = Some((msg.clone(), commitment_msg.clone()));
2533                                 },
2534                                 _ => panic!("Unexpected event"),
2535                         };
2536
2537                         prev_node = node;
2538                 }
2539
2540                 assert_eq!(expected_next_node, origin_node.node.get_our_node_id());
2541                 update_fulfill_dance!(origin_node, expected_route.first().unwrap(), true);
2542
2543                 let events = origin_node.node.get_and_clear_pending_events();
2544                 assert_eq!(events.len(), 1);
2545                 match events[0] {
2546                         Event::PaymentSent { payment_preimage } => {
2547                                 assert_eq!(payment_preimage, our_payment_preimage);
2548                         },
2549                         _ => panic!("Unexpected event"),
2550                 }
2551         }
2552
2553         const TEST_FINAL_CLTV: u32 = 32;
2554
2555         fn route_payment(origin_node: &Node, expected_route: &[&Node], recv_value: u64) -> ([u8; 32], [u8; 32]) {
2556                 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();
2557                 assert_eq!(route.hops.len(), expected_route.len());
2558                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
2559                         assert_eq!(hop.pubkey, node.node.get_our_node_id());
2560                 }
2561
2562                 send_along_route(origin_node, route, expected_route, recv_value)
2563         }
2564
2565         fn route_over_limit(origin_node: &Node, expected_route: &[&Node], recv_value: u64) {
2566                 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();
2567                 assert_eq!(route.hops.len(), expected_route.len());
2568                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
2569                         assert_eq!(hop.pubkey, node.node.get_our_node_id());
2570                 }
2571
2572                 let our_payment_preimage = unsafe { [PAYMENT_COUNT; 32] };
2573                 unsafe { PAYMENT_COUNT += 1 };
2574                 let our_payment_hash = {
2575                         let mut sha = Sha256::new();
2576                         sha.input(&our_payment_preimage[..]);
2577                         let mut ret = [0; 32];
2578                         sha.result(&mut ret);
2579                         ret
2580                 };
2581
2582                 let err = origin_node.node.send_payment(route, our_payment_hash).err().unwrap();
2583                 assert_eq!(err.err, "Cannot send value that would put us over our max HTLC value in flight");
2584         }
2585
2586         fn send_payment(origin: &Node, expected_route: &[&Node], recv_value: u64) {
2587                 let our_payment_preimage = route_payment(&origin, expected_route, recv_value).0;
2588                 claim_payment(&origin, expected_route, our_payment_preimage);
2589         }
2590
2591         fn fail_payment(origin_node: &Node, expected_route: &[&Node], our_payment_hash: [u8; 32]) {
2592                 assert!(expected_route.last().unwrap().node.fail_htlc_backwards(&our_payment_hash));
2593                 {
2594                         let mut added_monitors = expected_route.last().unwrap().chan_monitor.added_monitors.lock().unwrap();
2595                         assert_eq!(added_monitors.len(), 1);
2596                         added_monitors.clear();
2597                 }
2598
2599                 let mut next_msgs: Option<(msgs::UpdateFailHTLC, msgs::CommitmentSigned)> = None;
2600                 macro_rules! update_fail_dance {
2601                         ($node: expr, $prev_node: expr, $last_node: expr) => {
2602                                 {
2603                                         $node.node.handle_update_fail_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
2604                                         let revoke_and_commit = $node.node.handle_commitment_signed(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().1).unwrap();
2605
2606                                         {
2607                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2608                                                 assert_eq!(added_monitors.len(), 1);
2609                                                 added_monitors.clear();
2610                                         }
2611                                         assert!($prev_node.node.handle_revoke_and_ack(&$node.node.get_our_node_id(), &revoke_and_commit.0).unwrap().is_none());
2612                                         {
2613                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2614                                                 assert_eq!(added_monitors.len(), 1);
2615                                                 added_monitors.clear();
2616                                         }
2617                                         let revoke_and_ack = $prev_node.node.handle_commitment_signed(&$node.node.get_our_node_id(), &revoke_and_commit.1.unwrap()).unwrap();
2618                                         {
2619                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2620                                                 assert_eq!(added_monitors.len(), 1);
2621                                                 added_monitors.clear();
2622                                         }
2623                                         assert!(revoke_and_ack.1.is_none());
2624                                         assert!($node.node.get_and_clear_pending_events().is_empty());
2625                                         assert!($node.node.handle_revoke_and_ack(&$prev_node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2626                                         {
2627                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2628                                                 if $last_node {
2629                                                         assert_eq!(added_monitors.len(), 1);
2630                                                 } else {
2631                                                         assert_eq!(added_monitors.len(), 2);
2632                                                         assert!(added_monitors[0].0 != added_monitors[1].0);
2633                                                 }
2634                                                 added_monitors.clear();
2635                                         }
2636                                 }
2637                         }
2638                 }
2639
2640                 let mut expected_next_node = expected_route.last().unwrap().node.get_our_node_id();
2641                 let mut prev_node = expected_route.last().unwrap();
2642                 for node in expected_route.iter().rev() {
2643                         assert_eq!(expected_next_node, node.node.get_our_node_id());
2644                         if next_msgs.is_some() {
2645                                 update_fail_dance!(node, prev_node, false);
2646                         }
2647
2648                         let events = node.node.get_and_clear_pending_events();
2649                         assert_eq!(events.len(), 1);
2650                         match events[0] {
2651                                 Event::SendFailHTLC { ref node_id, ref msg, ref commitment_msg } => {
2652                                         expected_next_node = node_id.clone();
2653                                         next_msgs = Some((msg.clone(), commitment_msg.clone()));
2654                                 },
2655                                 _ => panic!("Unexpected event"),
2656                         };
2657
2658                         prev_node = node;
2659                 }
2660
2661                 assert_eq!(expected_next_node, origin_node.node.get_our_node_id());
2662                 update_fail_dance!(origin_node, expected_route.first().unwrap(), true);
2663
2664                 let events = origin_node.node.get_and_clear_pending_events();
2665                 assert_eq!(events.len(), 1);
2666                 match events[0] {
2667                         Event::PaymentFailed { payment_hash } => {
2668                                 assert_eq!(payment_hash, our_payment_hash);
2669                         },
2670                         _ => panic!("Unexpected event"),
2671                 }
2672         }
2673
2674         fn create_network(node_count: usize) -> Vec<Node> {
2675                 let mut nodes = Vec::new();
2676                 let mut rng = thread_rng();
2677                 let secp_ctx = Secp256k1::new();
2678
2679                 for _ in 0..node_count {
2680                         let feeest = Arc::new(test_utils::TestFeeEstimator { sat_per_kw: 253 });
2681                         let chain_monitor = Arc::new(chaininterface::ChainWatchInterfaceUtil::new());
2682                         let tx_broadcaster = Arc::new(test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new())});
2683                         let chan_monitor = Arc::new(test_utils::TestChannelMonitor::new(chain_monitor.clone(), tx_broadcaster.clone()));
2684                         let node_id = {
2685                                 let mut key_slice = [0; 32];
2686                                 rng.fill_bytes(&mut key_slice);
2687                                 SecretKey::from_slice(&secp_ctx, &key_slice).unwrap()
2688                         };
2689                         let node = ChannelManager::new(node_id.clone(), 0, true, Network::Testnet, feeest.clone(), chan_monitor.clone(), chain_monitor.clone(), tx_broadcaster.clone()).unwrap();
2690                         let router = Router::new(PublicKey::from_secret_key(&secp_ctx, &node_id).unwrap());
2691                         nodes.push(Node { feeest, chain_monitor, tx_broadcaster, chan_monitor, node_id, node, router });
2692                 }
2693
2694                 nodes
2695         }
2696
2697         #[test]
2698         fn fake_network_test() {
2699                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
2700                 // tests that payments get routed and transactions broadcast in semi-reasonable ways.
2701                 let nodes = create_network(4);
2702
2703                 // Create some initial channels
2704                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
2705                 let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2);
2706                 let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3);
2707
2708                 // Rebalance the network a bit by relaying one payment through all the channels...
2709                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2710                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2711                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2712                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2713
2714                 // Send some more payments
2715                 send_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 1000000);
2716                 send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1], &nodes[0])[..], 1000000);
2717                 send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1])[..], 1000000);
2718
2719                 // Test failure packets
2720                 let payment_hash_1 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 1000000).1;
2721                 fail_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], payment_hash_1);
2722
2723                 // Add a new channel that skips 3
2724                 let chan_4 = create_announced_chan_between_nodes(&nodes, 1, 3);
2725
2726                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 1000000);
2727                 send_payment(&nodes[2], &vec!(&nodes[3])[..], 1000000);
2728                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2729                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2730                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2731                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2732                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2733
2734                 // Do some rebalance loop payments, simultaneously
2735                 let mut hops = Vec::with_capacity(3);
2736                 hops.push(RouteHop {
2737                         pubkey: nodes[2].node.get_our_node_id(),
2738                         short_channel_id: chan_2.0.contents.short_channel_id,
2739                         fee_msat: 0,
2740                         cltv_expiry_delta: chan_3.0.contents.cltv_expiry_delta as u32
2741                 });
2742                 hops.push(RouteHop {
2743                         pubkey: nodes[3].node.get_our_node_id(),
2744                         short_channel_id: chan_3.0.contents.short_channel_id,
2745                         fee_msat: 0,
2746                         cltv_expiry_delta: chan_4.1.contents.cltv_expiry_delta as u32
2747                 });
2748                 hops.push(RouteHop {
2749                         pubkey: nodes[1].node.get_our_node_id(),
2750                         short_channel_id: chan_4.0.contents.short_channel_id,
2751                         fee_msat: 1000000,
2752                         cltv_expiry_delta: TEST_FINAL_CLTV,
2753                 });
2754                 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;
2755                 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;
2756                 let payment_preimage_1 = send_along_route(&nodes[1], Route { hops }, &vec!(&nodes[2], &nodes[3], &nodes[1])[..], 1000000).0;
2757
2758                 let mut hops = Vec::with_capacity(3);
2759                 hops.push(RouteHop {
2760                         pubkey: nodes[3].node.get_our_node_id(),
2761                         short_channel_id: chan_4.0.contents.short_channel_id,
2762                         fee_msat: 0,
2763                         cltv_expiry_delta: chan_3.1.contents.cltv_expiry_delta as u32
2764                 });
2765                 hops.push(RouteHop {
2766                         pubkey: nodes[2].node.get_our_node_id(),
2767                         short_channel_id: chan_3.0.contents.short_channel_id,
2768                         fee_msat: 0,
2769                         cltv_expiry_delta: chan_2.1.contents.cltv_expiry_delta as u32
2770                 });
2771                 hops.push(RouteHop {
2772                         pubkey: nodes[1].node.get_our_node_id(),
2773                         short_channel_id: chan_2.0.contents.short_channel_id,
2774                         fee_msat: 1000000,
2775                         cltv_expiry_delta: TEST_FINAL_CLTV,
2776                 });
2777                 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;
2778                 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;
2779                 let payment_hash_2 = send_along_route(&nodes[1], Route { hops }, &vec!(&nodes[3], &nodes[2], &nodes[1])[..], 1000000).1;
2780
2781                 // Claim the rebalances...
2782                 fail_payment(&nodes[1], &vec!(&nodes[3], &nodes[2], &nodes[1])[..], payment_hash_2);
2783                 claim_payment(&nodes[1], &vec!(&nodes[2], &nodes[3], &nodes[1])[..], payment_preimage_1);
2784
2785                 // Add a duplicate new channel from 2 to 4
2786                 let chan_5 = create_announced_chan_between_nodes(&nodes, 1, 3);
2787
2788                 // Send some payments across both channels
2789                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2790                 let payment_preimage_4 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2791                 let payment_preimage_5 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2792
2793                 route_over_limit(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000);
2794
2795                 //TODO: Test that routes work again here as we've been notified that the channel is full
2796
2797                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_3);
2798                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_4);
2799                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_5);
2800
2801                 // Close down the channels...
2802                 close_channel(&nodes[0], &nodes[1], &chan_1.2, chan_1.3, true);
2803                 close_channel(&nodes[1], &nodes[2], &chan_2.2, chan_2.3, false);
2804                 close_channel(&nodes[2], &nodes[3], &chan_3.2, chan_3.3, true);
2805                 close_channel(&nodes[1], &nodes[3], &chan_4.2, chan_4.3, false);
2806                 close_channel(&nodes[1], &nodes[3], &chan_5.2, chan_5.3, false);
2807
2808                 // Check that we processed all pending events
2809                 for node in nodes {
2810                         assert_eq!(node.node.get_and_clear_pending_events().len(), 0);
2811                         assert_eq!(node.chan_monitor.added_monitors.lock().unwrap().len(), 0);
2812                 }
2813         }
2814
2815         #[derive(PartialEq)]
2816         enum HTLCType { NONE, TIMEOUT, SUCCESS }
2817         fn test_txn_broadcast(node: &Node, chan: &(msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction), commitment_tx: Option<Transaction>, has_htlc_tx: HTLCType) -> Vec<Transaction> {
2818                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
2819                 assert!(node_txn.len() >= if commitment_tx.is_some() { 0 } else { 1 } + if has_htlc_tx == HTLCType::NONE { 0 } else { 1 });
2820
2821                 let mut res = Vec::with_capacity(2);
2822
2823                 if let Some(explicit_tx) = commitment_tx {
2824                         res.push(explicit_tx.clone());
2825                 } else {
2826                         for tx in node_txn.iter() {
2827                                 if tx.input.len() == 1 && tx.input[0].prev_hash == chan.3.txid() {
2828                                         let mut funding_tx_map = HashMap::new();
2829                                         funding_tx_map.insert(chan.3.txid(), chan.3.clone());
2830                                         tx.verify(&funding_tx_map).unwrap();
2831                                         res.push(tx.clone());
2832                                 }
2833                         }
2834                 }
2835                 assert_eq!(res.len(), 1);
2836
2837                 if has_htlc_tx != HTLCType::NONE {
2838                         for tx in node_txn.iter() {
2839                                 if tx.input.len() == 1 && tx.input[0].prev_hash == res[0].txid() {
2840                                         let mut funding_tx_map = HashMap::new();
2841                                         funding_tx_map.insert(res[0].txid(), res[0].clone());
2842                                         tx.verify(&funding_tx_map).unwrap();
2843                                         if has_htlc_tx == HTLCType::TIMEOUT {
2844                                                 assert!(tx.lock_time != 0);
2845                                         } else {
2846                                                 assert!(tx.lock_time == 0);
2847                                         }
2848                                         res.push(tx.clone());
2849                                         break;
2850                                 }
2851                         }
2852                         assert_eq!(res.len(), 2);
2853                 }
2854                 node_txn.clear();
2855                 res
2856         }
2857
2858         fn check_preimage_claim(node: &Node, prev_txn: &Vec<Transaction>) -> Vec<Transaction> {
2859                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
2860
2861                 assert!(node_txn.len() >= 1);
2862                 assert_eq!(node_txn[0].input.len(), 1);
2863                 let mut found_prev = false;
2864
2865                 for tx in prev_txn {
2866                         if node_txn[0].input[0].prev_hash == tx.txid() {
2867                                 let mut funding_tx_map = HashMap::new();
2868                                 funding_tx_map.insert(tx.txid(), tx.clone());
2869                                 node_txn[0].verify(&funding_tx_map).unwrap();
2870
2871                                 assert!(node_txn[0].input[0].witness[2].len() > 106); // must spend an htlc output
2872                                 assert_eq!(tx.input.len(), 1); // must spend a commitment tx
2873
2874                                 found_prev = true;
2875                                 break;
2876                         }
2877                 }
2878                 assert!(found_prev);
2879
2880                 let mut res = Vec::new();
2881                 mem::swap(&mut *node_txn, &mut res);
2882                 res
2883         }
2884
2885         fn get_announce_close_broadcast_events(nodes: &Vec<Node>, a: usize, b: usize) {
2886                 let events_1 = nodes[a].node.get_and_clear_pending_events();
2887                 assert_eq!(events_1.len(), 1);
2888                 let as_update = match events_1[0] {
2889                         Event::BroadcastChannelUpdate { ref msg } => {
2890                                 msg.clone()
2891                         },
2892                         _ => panic!("Unexpected event"),
2893                 };
2894
2895                 let events_2 = nodes[b].node.get_and_clear_pending_events();
2896                 assert_eq!(events_2.len(), 1);
2897                 let bs_update = match events_2[0] {
2898                         Event::BroadcastChannelUpdate { ref msg } => {
2899                                 msg.clone()
2900                         },
2901                         _ => panic!("Unexpected event"),
2902                 };
2903
2904                 for node in nodes {
2905                         node.router.handle_channel_update(&as_update).unwrap();
2906                         node.router.handle_channel_update(&bs_update).unwrap();
2907                 }
2908         }
2909
2910         #[test]
2911         fn channel_monitor_network_test() {
2912                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
2913                 // tests that ChannelMonitor is able to recover from various states.
2914                 let nodes = create_network(5);
2915
2916                 // Create some initial channels
2917                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
2918                 let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2);
2919                 let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3);
2920                 let chan_4 = create_announced_chan_between_nodes(&nodes, 3, 4);
2921
2922                 // Rebalance the network a bit by relaying one payment through all the channels...
2923                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2924                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2925                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2926                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2927
2928                 // Simple case with no pending HTLCs:
2929                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), true);
2930                 {
2931                         let mut node_txn = test_txn_broadcast(&nodes[1], &chan_1, None, HTLCType::NONE);
2932                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2933                         nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn.drain(..).next().unwrap()] }, 1);
2934                         test_txn_broadcast(&nodes[0], &chan_1, None, HTLCType::NONE);
2935                 }
2936                 get_announce_close_broadcast_events(&nodes, 0, 1);
2937                 assert_eq!(nodes[0].node.list_channels().len(), 0);
2938                 assert_eq!(nodes[1].node.list_channels().len(), 1);
2939
2940                 // One pending HTLC is discarded by the force-close:
2941                 let payment_preimage_1 = route_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 3000000).0;
2942
2943                 // Simple case of one pending HTLC to HTLC-Timeout
2944                 nodes[1].node.peer_disconnected(&nodes[2].node.get_our_node_id(), true);
2945                 {
2946                         let mut node_txn = test_txn_broadcast(&nodes[1], &chan_2, None, HTLCType::TIMEOUT);
2947                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2948                         nodes[2].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn.drain(..).next().unwrap()] }, 1);
2949                         test_txn_broadcast(&nodes[2], &chan_2, None, HTLCType::NONE);
2950                 }
2951                 get_announce_close_broadcast_events(&nodes, 1, 2);
2952                 assert_eq!(nodes[1].node.list_channels().len(), 0);
2953                 assert_eq!(nodes[2].node.list_channels().len(), 1);
2954
2955                 macro_rules! claim_funds {
2956                         ($node: expr, $prev_node: expr, $preimage: expr) => {
2957                                 {
2958                                         assert!($node.node.claim_funds($preimage));
2959                                         {
2960                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2961                                                 assert_eq!(added_monitors.len(), 1);
2962                                                 added_monitors.clear();
2963                                         }
2964
2965                                         let events = $node.node.get_and_clear_pending_events();
2966                                         assert_eq!(events.len(), 1);
2967                                         match events[0] {
2968                                                 Event::SendFulfillHTLC { ref node_id, .. } => {
2969                                                         assert_eq!(*node_id, $prev_node.node.get_our_node_id());
2970                                                 },
2971                                                 _ => panic!("Unexpected event"),
2972                                         };
2973                                 }
2974                         }
2975                 }
2976
2977                 // nodes[3] gets the preimage, but nodes[2] already disconnected, resulting in a nodes[2]
2978                 // HTLC-Timeout and a nodes[3] claim against it (+ its own announces)
2979                 nodes[2].node.peer_disconnected(&nodes[3].node.get_our_node_id(), true);
2980                 {
2981                         let node_txn = test_txn_broadcast(&nodes[2], &chan_3, None, HTLCType::TIMEOUT);
2982
2983                         // Claim the payment on nodes[3], giving it knowledge of the preimage
2984                         claim_funds!(nodes[3], nodes[2], payment_preimage_1);
2985
2986                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2987                         nodes[3].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[0].clone()] }, 1);
2988
2989                         check_preimage_claim(&nodes[3], &node_txn);
2990                 }
2991                 get_announce_close_broadcast_events(&nodes, 2, 3);
2992                 assert_eq!(nodes[2].node.list_channels().len(), 0);
2993                 assert_eq!(nodes[3].node.list_channels().len(), 1);
2994
2995                 // One pending HTLC to time out:
2996                 let payment_preimage_2 = route_payment(&nodes[3], &vec!(&nodes[4])[..], 3000000).0;
2997
2998                 {
2999                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3000                         nodes[3].chain_monitor.block_connected_checked(&header, 1, &Vec::new()[..], &[0; 0]);
3001                         for i in 2..TEST_FINAL_CLTV - 3 {
3002                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3003                                 nodes[3].chain_monitor.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
3004                         }
3005
3006                         let node_txn = test_txn_broadcast(&nodes[3], &chan_4, None, HTLCType::TIMEOUT);
3007
3008                         // Claim the payment on nodes[3], giving it knowledge of the preimage
3009                         claim_funds!(nodes[4], nodes[3], payment_preimage_2);
3010
3011                         header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3012                         nodes[4].chain_monitor.block_connected_checked(&header, 1, &Vec::new()[..], &[0; 0]);
3013                         for i in 2..TEST_FINAL_CLTV - 3 {
3014                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3015                                 nodes[4].chain_monitor.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
3016                         }
3017
3018                         test_txn_broadcast(&nodes[4], &chan_4, None, HTLCType::SUCCESS);
3019
3020                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3021                         nodes[4].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[0].clone()] }, TEST_FINAL_CLTV - 5);
3022
3023                         check_preimage_claim(&nodes[4], &node_txn);
3024                 }
3025                 get_announce_close_broadcast_events(&nodes, 3, 4);
3026                 assert_eq!(nodes[3].node.list_channels().len(), 0);
3027                 assert_eq!(nodes[4].node.list_channels().len(), 0);
3028
3029                 // Create some new channels:
3030                 let chan_5 = create_announced_chan_between_nodes(&nodes, 0, 1);
3031
3032                 // A pending HTLC which will be revoked:
3033                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
3034                 // Get the will-be-revoked local txn from nodes[0]
3035                 let revoked_local_txn = nodes[0].node.channel_state.lock().unwrap().by_id.iter().next().unwrap().1.last_local_commitment_txn.clone();
3036                 // Revoke the old state
3037                 claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage_3);
3038
3039                 {
3040                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3041                         nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
3042                         {
3043                                 let mut node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
3044                                 assert_eq!(node_txn.len(), 2);
3045                                 assert_eq!(node_txn[0].input.len(), 1);
3046
3047                                 let mut funding_tx_map = HashMap::new();
3048                                 funding_tx_map.insert(revoked_local_txn[0].txid(), revoked_local_txn[0].clone());
3049                                 node_txn[0].verify(&funding_tx_map).unwrap();
3050                                 node_txn.swap_remove(0);
3051                         }
3052                         test_txn_broadcast(&nodes[1], &chan_5, None, HTLCType::NONE);
3053
3054                         nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
3055                         let node_txn = test_txn_broadcast(&nodes[0], &chan_5, Some(revoked_local_txn[0].clone()), HTLCType::TIMEOUT);
3056                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3057                         nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[1].clone()] }, 1);
3058
3059                         //TODO: At this point nodes[1] should claim the revoked HTLC-Timeout output, but that's
3060                         //not yet implemented in ChannelMonitor
3061                 }
3062                 get_announce_close_broadcast_events(&nodes, 0, 1);
3063                 assert_eq!(nodes[0].node.list_channels().len(), 0);
3064                 assert_eq!(nodes[1].node.list_channels().len(), 0);
3065
3066                 // Check that we processed all pending events
3067                 for node in nodes {
3068                         assert_eq!(node.node.get_and_clear_pending_events().len(), 0);
3069                         assert_eq!(node.chan_monitor.added_monitors.lock().unwrap().len(), 0);
3070                 }
3071         }
3072
3073         #[test]
3074         fn test_unconf_chan() {
3075                 // After creating a chan between nodes, we disconnect all blocks previously seen to force a channel close on nodes[0] side
3076                 let nodes = create_network(2);
3077                 create_announced_chan_between_nodes(&nodes, 0, 1);
3078
3079                 let channel_state = nodes[0].node.channel_state.lock().unwrap();
3080                 assert_eq!(channel_state.by_id.len(), 1);
3081                 assert_eq!(channel_state.short_to_id.len(), 1);
3082                 mem::drop(channel_state);
3083
3084                 let mut headers = Vec::new();
3085                 let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3086                 headers.push(header.clone());
3087                 for _i in 2..100 {
3088                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3089                         headers.push(header.clone());
3090                 }
3091                 while !headers.is_empty() {
3092                         nodes[0].node.block_disconnected(&headers.pop().unwrap());
3093                 }
3094                 let channel_state = nodes[0].node.channel_state.lock().unwrap();
3095                 assert_eq!(channel_state.by_id.len(), 0);
3096                 assert_eq!(channel_state.short_to_id.len(), 0);
3097         }
3098 }