_ 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                         /// short channel id -> forward infos. Key of 0 means payments received
 141                         forward_htlcs: &mut self.forward_htlcs,
 142                         claimable_htlcs: &mut self.claimable_htlcs,
 143                 }
 144         }
 145 }
 146
 147 /// Manager which keeps track of a number of channels and sends messages to the appropriate
 148 /// channel, also tracking HTLC preimages and forwarding onion packets appropriately.
 149 /// Implements ChannelMessageHandler, handling the multi-channel parts and passing things through
 150 /// to individual Channels.
 151 pub struct ChannelManager {
 152         genesis_hash: Sha256dHash,
 153         fee_estimator: Arc<FeeEstimator>,
 154         monitor: Arc<ManyChannelMonitor>,
 155         chain_monitor: Arc<ChainWatchInterface>,
 156         tx_broadcaster: Arc<BroadcasterInterface>,
 157
 158         announce_channels_publicly: bool,
 159         fee_proportional_millionths: u32,
 160         latest_block_height: AtomicUsize, //TODO: Compile-time assert this is at least 32-bits long
 161         secp_ctx: Secp256k1,
 162
 163         channel_state: Mutex<ChannelHolder>,
 164         our_network_key: SecretKey,
 165
 166         pending_events: Mutex<Vec<events::Event>>,
 167 }
 168
 169 const CLTV_EXPIRY_DELTA: u16 = 6 * 24 * 2; //TODO?
 170
 171 macro_rules! secp_call {
 172         ( $res : expr ) => {
 173                 match $res {
 174                         Ok(key) => key,
 175                         //TODO: Make the err a parameter!
 176                         Err(_) => return Err(HandleError{err: "Key error", action: None})
 177                 }
 178         };
 179 }
 180
 181 struct OnionKeys {
 182         #[cfg(test)]
 183         shared_secret: SharedSecret,
 184         #[cfg(test)]
 185         blinding_factor: [u8; 32],
 186         ephemeral_pubkey: PublicKey,
 187         rho: [u8; 32],
 188         mu: [u8; 32],
 189 }
 190
 191 pub struct ChannelDetails {
 192         /// The channel's ID (prior to funding transaction generation, this is a random 32 bytes,
 193         /// thereafter this is the txid of the funding transaction xor the funding transaction output).
 194         /// Note that this means this value is *not* persistent - it can change once during the
 195         /// lifetime of the channel.
 196         pub channel_id: [u8; 32],
 197         /// The position of the funding transaction in the chain. None if the funding transaction has
 198         /// not yet been confirmed and the channel fully opened.
 199         pub short_channel_id: Option<u64>,
 200         pub remote_network_id: PublicKey,
 201         pub channel_value_satoshis: u64,
 202         /// The user_id passed in to create_channel, or 0 if the channel was inbound.
 203         pub user_id: u64,
 204 }
 205
 206 impl ChannelManager {
 207         /// Constructs a new ChannelManager to hold several channels and route between them. This is
 208         /// the main "logic hub" for all channel-related actions, and implements ChannelMessageHandler.
 209         /// fee_proportional_millionths is an optional fee to charge any payments routed through us.
 210         /// Non-proportional fees are fixed according to our risk using the provided fee estimator.
 211         /// panics if channel_value_satoshis is >= `MAX_FUNDING_SATOSHIS`!
 212         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> {
 213                 let secp_ctx = Secp256k1::new();
 214
 215                 let res = Arc::new(ChannelManager {
 216                         genesis_hash: genesis_block(network).header.bitcoin_hash(),
 217                         fee_estimator: feeest.clone(),
 218                         monitor: monitor.clone(),
 219                         chain_monitor,
 220                         tx_broadcaster,
 221
 222                         announce_channels_publicly,
 223                         fee_proportional_millionths,
 224                         latest_block_height: AtomicUsize::new(0), //TODO: Get an init value (generally need to replay recent chain on chain_monitor registration)
 225                         secp_ctx,
 226
 227                         channel_state: Mutex::new(ChannelHolder{
 228                                 by_id: HashMap::new(),
 229                                 short_to_id: HashMap::new(),
 230                                 next_forward: Instant::now(),
 231                                 forward_htlcs: HashMap::new(),
 232                                 claimable_htlcs: HashMap::new(),
 233                         }),
 234                         our_network_key,
 235
 236                         pending_events: Mutex::new(Vec::new()),
 237                 });
 238                 let weak_res = Arc::downgrade(&res);
 239                 res.chain_monitor.register_listener(weak_res);
 240                 Ok(res)
 241         }
 242
 243         /// Creates a new outbound channel to the given remote node and with the given value.
 244         /// user_id will be provided back as user_channel_id in FundingGenerationReady and
 245         /// FundingBroadcastSafe events to allow tracking of which events correspond with which
 246         /// create_channel call. Note that user_channel_id defaults to 0 for inbound channels, so you
 247         /// may wish to avoid using 0 for user_id here.
 248         /// If successful, will generate a SendOpenChannel event, so you should probably poll
 249         /// PeerManager::process_events afterwards.
 250         pub fn create_channel(&self, their_network_key: PublicKey, channel_value_satoshis: u64, user_id: u64) -> Result<(), HandleError> {
 251                 let chan_keys = if cfg!(feature = "fuzztarget") {
 252                         ChannelKeys {
 253                                 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(),
 254                                 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(),
 255                                 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(),
 256                                 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(),
 257                                 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(),
 258                                 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(),
 259                                 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(),
 260                                 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],
 261                         }
 262                 } else {
 263                         let mut key_seed = [0u8; 32];
 264                         rng::fill_bytes(&mut key_seed);
 265                         match ChannelKeys::new_from_seed(&key_seed) {
 266                                 Ok(key) => key,
 267                                 Err(_) => panic!("RNG is busted!")
 268                         }
 269                 };
 270
 271                 let channel = Channel::new_outbound(&*self.fee_estimator, chan_keys, their_network_key, channel_value_satoshis, self.announce_channels_publicly, user_id);
 272                 let res = channel.get_open_channel(self.genesis_hash.clone(), &*self.fee_estimator)?;
 273                 let mut channel_state = self.channel_state.lock().unwrap();
 274                 match channel_state.by_id.insert(channel.channel_id(), channel) {
 275                         Some(_) => panic!("RNG is bad???"),
 276                         None => {}
 277                 }
 278
 279                 let mut events = self.pending_events.lock().unwrap();
 280                 events.push(events::Event::SendOpenChannel {
 281                         node_id: their_network_key,
 282                         msg: res,
 283                 });
 284                 Ok(())
 285         }
 286
 287         /// Gets the list of open channels, in random order. See ChannelDetail field documentation for
 288         /// more information.
 289         pub fn list_channels(&self) -> Vec<ChannelDetails> {
 290                 let channel_state = self.channel_state.lock().unwrap();
 291                 let mut res = Vec::with_capacity(channel_state.by_id.len());
 292                 for (channel_id, channel) in channel_state.by_id.iter() {
 293                         res.push(ChannelDetails {
 294                                 channel_id: (*channel_id).clone(),
 295                                 short_channel_id: channel.get_short_channel_id(),
 296                                 remote_network_id: channel.get_their_node_id(),
 297                                 channel_value_satoshis: channel.get_value_satoshis(),
 298                                 user_id: channel.get_user_id(),
 299                         });
 300                 }
 301                 res
 302         }
 303
 304         /// Gets the list of usable channels, in random order. Useful as an argument to
 305         /// Router::get_route to ensure non-announced channels are used.
 306         pub fn list_usable_channels(&self) -> Vec<ChannelDetails> {
 307                 let channel_state = self.channel_state.lock().unwrap();
 308                 let mut res = Vec::with_capacity(channel_state.by_id.len());
 309                 for (channel_id, channel) in channel_state.by_id.iter() {
 310                         if channel.is_usable() {
 311                                 res.push(ChannelDetails {
 312                                         channel_id: (*channel_id).clone(),
 313                                         short_channel_id: channel.get_short_channel_id(),
 314                                         remote_network_id: channel.get_their_node_id(),
 315                                         channel_value_satoshis: channel.get_value_satoshis(),
 316                                         user_id: channel.get_user_id(),
 317                                 });
 318                         }
 319                 }
 320                 res
 321         }
 322
 323         /// Begins the process of closing a channel. After this call (plus some timeout), no new HTLCs
 324         /// will be accepted on the given channel, and after additional timeout/the closing of all
 325         /// pending HTLCs, the channel will be closed on chain.
 326         /// May generate a SendShutdown event on success, which should be relayed.
 327         pub fn close_channel(&self, channel_id: &[u8; 32]) -> Result<(), HandleError> {
 328                 let (res, node_id, chan_option) = {
 329                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 330                         let channel_state = channel_state_lock.borrow_parts();
 331                         match channel_state.by_id.entry(channel_id.clone()) {
 332                                 hash_map::Entry::Occupied(mut chan_entry) => {
 333                                         let res = chan_entry.get_mut().get_shutdown()?;
 334                                         if chan_entry.get().is_shutdown() {
 335                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
 336                                                         channel_state.short_to_id.remove(&short_id);
 337                                                 }
 338                                                 (res, chan_entry.get().get_their_node_id(), Some(chan_entry.remove_entry().1))
 339                                         } else { (res, chan_entry.get().get_their_node_id(), None) }
 340                                 },
 341                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "No such channel", action: None})
 342                         }
 343                 };
 344                 for payment_hash in res.1 {
 345                         // unknown_next_peer...I dunno who that is anymore....
 346                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
 347                 }
 348                 let chan_update = if let Some(chan) = chan_option {
 349                         if let Ok(update) = self.get_channel_update(&chan) {
 350                                 Some(update)
 351                         } else { None }
 352                 } else { None };
 353
 354                 let mut events = self.pending_events.lock().unwrap();
 355                 if let Some(update) = chan_update {
 356                         events.push(events::Event::BroadcastChannelUpdate {
 357                                 msg: update
 358                         });
 359                 }
 360                 events.push(events::Event::SendShutdown {
 361                         node_id,
 362                         msg: res.0
 363                 });
 364
 365                 Ok(())
 366         }
 367
 368         #[inline]
 369         fn finish_force_close_channel(&self, shutdown_res: (Vec<Transaction>, Vec<[u8; 32]>)) {
 370                 let (local_txn, failed_htlcs) = shutdown_res;
 371                 for payment_hash in failed_htlcs {
 372                         // unknown_next_peer...I dunno who that is anymore....
 373                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
 374                 }
 375                 for tx in local_txn {
 376                         self.tx_broadcaster.broadcast_transaction(&tx);
 377                 }
 378                 //TODO: We need to have a way where outbound HTLC claims can result in us claiming the
 379                 //now-on-chain HTLC output for ourselves (and, thereafter, passing the HTLC backwards).
 380                 //TODO: We need to handle monitoring of pending offered HTLCs which just hit the chain and
 381                 //may be claimed, resulting in us claiming the inbound HTLCs (and back-failing after
 382                 //timeouts are hit and our claims confirm).
 383         }
 384
 385         /// Force closes a channel, immediately broadcasting the latest local commitment transaction to
 386         /// the chain and rejecting new HTLCs on the given channel.
 387         pub fn force_close_channel(&self, channel_id: &[u8; 32]) {
 388                 let mut chan = {
 389                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 390                         let channel_state = channel_state_lock.borrow_parts();
 391                         if let Some(chan) = channel_state.by_id.remove(channel_id) {
 392                                 if let Some(short_id) = chan.get_short_channel_id() {
 393                                         channel_state.short_to_id.remove(&short_id);
 394                                 }
 395                                 chan
 396                         } else {
 397                                 return;
 398                         }
 399                 };
 400                 self.finish_force_close_channel(chan.force_shutdown());
 401                 let mut events = self.pending_events.lock().unwrap();
 402                 if let Ok(update) = self.get_channel_update(&chan) {
 403                         events.push(events::Event::BroadcastChannelUpdate {
 404                                 msg: update
 405                         });
 406                 }
 407         }
 408
 409         #[inline]
 410         fn gen_rho_mu_from_shared_secret(shared_secret: &SharedSecret) -> ([u8; 32], [u8; 32]) {
 411                 ({
 412                         let mut hmac = Hmac::new(Sha256::new(), &[0x72, 0x68, 0x6f]); // rho
 413                         hmac.input(&shared_secret[..]);
 414                         let mut res = [0; 32];
 415                         hmac.raw_result(&mut res);
 416                         res
 417                 },
 418                 {
 419                         let mut hmac = Hmac::new(Sha256::new(), &[0x6d, 0x75]); // mu
 420                         hmac.input(&shared_secret[..]);
 421                         let mut res = [0; 32];
 422                         hmac.raw_result(&mut res);
 423                         res
 424                 })
 425         }
 426
 427         #[inline]
 428         fn gen_um_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 429                 let mut hmac = Hmac::new(Sha256::new(), &[0x75, 0x6d]); // um
 430                 hmac.input(&shared_secret[..]);
 431                 let mut res = [0; 32];
 432                 hmac.raw_result(&mut res);
 433                 res
 434         }
 435
 436         #[inline]
 437         fn gen_ammag_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 438                 let mut hmac = Hmac::new(Sha256::new(), &[0x61, 0x6d, 0x6d, 0x61, 0x67]); // ammag
 439                 hmac.input(&shared_secret[..]);
 440                 let mut res = [0; 32];
 441                 hmac.raw_result(&mut res);
 442                 res
 443         }
 444
 445         // can only fail if an intermediary hop has an invalid public key or session_priv is invalid
 446         #[inline]
 447         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> {
 448                 let mut blinded_priv = session_priv.clone();
 449                 let mut blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 450                 let mut first_iteration = true;
 451
 452                 for hop in route.hops.iter() {
 453                         let shared_secret = SharedSecret::new(secp_ctx, &hop.pubkey, &blinded_priv);
 454
 455                         let mut sha = Sha256::new();
 456                         sha.input(&blinded_pub.serialize()[..]);
 457                         sha.input(&shared_secret[..]);
 458                         let mut blinding_factor = [0u8; 32];
 459                         sha.result(&mut blinding_factor);
 460
 461                         if first_iteration {
 462                                 blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 463                                 first_iteration = false;
 464                         }
 465                         let ephemeral_pubkey = blinded_pub;
 466
 467                         secp_call!(blinded_priv.mul_assign(secp_ctx, &secp_call!(SecretKey::from_slice(secp_ctx, &blinding_factor))));
 468                         blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 469
 470                         callback(shared_secret, blinding_factor, ephemeral_pubkey, hop);
 471                 }
 472
 473                 Ok(())
 474         }
 475
 476         // can only fail if an intermediary hop has an invalid public key or session_priv is invalid
 477         fn construct_onion_keys(secp_ctx: &Secp256k1, route: &Route, session_priv: &SecretKey) -> Result<Vec<OnionKeys>, HandleError> {
 478                 let mut res = Vec::with_capacity(route.hops.len());
 479
 480                 Self::construct_onion_keys_callback(secp_ctx, route, session_priv, |shared_secret, _blinding_factor, ephemeral_pubkey, _| {
 481                         let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
 482
 483                         res.push(OnionKeys {
 484                                 #[cfg(test)]
 485                                 shared_secret,
 486                                 #[cfg(test)]
 487                                 blinding_factor: _blinding_factor,
 488                                 ephemeral_pubkey,
 489                                 rho,
 490                                 mu,
 491                         });
 492                 })?;
 493
 494                 Ok(res)
 495         }
 496
 497         /// returns the hop data, as well as the first-hop value_msat and CLTV value we should send.
 498         fn build_onion_payloads(route: &Route, starting_htlc_offset: u32) -> Result<(Vec<msgs::OnionHopData>, u64, u32), HandleError> {
 499                 let mut cur_value_msat = 0u64;
 500                 let mut cur_cltv = starting_htlc_offset;
 501                 let mut last_short_channel_id = 0;
 502                 let mut res: Vec<msgs::OnionHopData> = Vec::with_capacity(route.hops.len());
 503                 internal_traits::test_no_dealloc::<msgs::OnionHopData>(None);
 504                 unsafe { res.set_len(route.hops.len()); }
 505
 506                 for (idx, hop) in route.hops.iter().enumerate().rev() {
 507                         // First hop gets special values so that it can check, on receipt, that everything is
 508                         // exactly as it should be (and the next hop isn't trying to probe to find out if we're
 509                         // the intended recipient).
 510                         let value_msat = if cur_value_msat == 0 { hop.fee_msat } else { cur_value_msat };
 511                         let cltv = if cur_cltv == starting_htlc_offset { hop.cltv_expiry_delta + starting_htlc_offset } else { cur_cltv };
 512                         res[idx] = msgs::OnionHopData {
 513                                 realm: 0,
 514                                 data: msgs::OnionRealm0HopData {
 515                                         short_channel_id: last_short_channel_id,
 516                                         amt_to_forward: value_msat,
 517                                         outgoing_cltv_value: cltv,
 518                                 },
 519                                 hmac: [0; 32],
 520                         };
 521                         cur_value_msat += hop.fee_msat;
 522                         if cur_value_msat >= 21000000 * 100000000 * 1000 {
 523                                 return Err(HandleError{err: "Channel fees overflowed?!", action: None});
 524                         }
 525                         cur_cltv += hop.cltv_expiry_delta as u32;
 526                         if cur_cltv >= 500000000 {
 527                                 return Err(HandleError{err: "Channel CLTV overflowed?!", action: None});
 528                         }
 529                         last_short_channel_id = hop.short_channel_id;
 530                 }
 531                 Ok((res, cur_value_msat, cur_cltv))
 532         }
 533
 534         #[inline]
 535         fn shift_arr_right(arr: &mut [u8; 20*65]) {
 536                 unsafe {
 537                         ptr::copy(arr[0..].as_ptr(), arr[65..].as_mut_ptr(), 19*65);
 538                 }
 539                 for i in 0..65 {
 540                         arr[i] = 0;
 541                 }
 542         }
 543
 544         #[inline]
 545         fn xor_bufs(dst: &mut[u8], src: &[u8]) {
 546                 assert_eq!(dst.len(), src.len());
 547
 548                 for i in 0..dst.len() {
 549                         dst[i] ^= src[i];
 550                 }
 551         }
 552
 553         const ZERO:[u8; 21*65] = [0; 21*65];
 554         fn construct_onion_packet(mut payloads: Vec<msgs::OnionHopData>, onion_keys: Vec<OnionKeys>, associated_data: &[u8; 32]) -> Result<msgs::OnionPacket, HandleError> {
 555                 let mut buf = Vec::with_capacity(21*65);
 556                 buf.resize(21*65, 0);
 557
 558                 let filler = {
 559                         let iters = payloads.len() - 1;
 560                         let end_len = iters * 65;
 561                         let mut res = Vec::with_capacity(end_len);
 562                         res.resize(end_len, 0);
 563
 564                         for (i, keys) in onion_keys.iter().enumerate() {
 565                                 if i == payloads.len() - 1 { continue; }
 566                                 let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 567                                 chacha.process(&ChannelManager::ZERO, &mut buf); // We don't have a seek function :(
 568                                 ChannelManager::xor_bufs(&mut res[0..(i + 1)*65], &buf[(20 - i)*65..21*65]);
 569                         }
 570                         res
 571                 };
 572
 573                 let mut packet_data = [0; 20*65];
 574                 let mut hmac_res = [0; 32];
 575
 576                 for (i, (payload, keys)) in payloads.iter_mut().zip(onion_keys.iter()).rev().enumerate() {
 577                         ChannelManager::shift_arr_right(&mut packet_data);
 578                         payload.hmac = hmac_res;
 579                         packet_data[0..65].copy_from_slice(&payload.encode()[..]);
 580
 581                         let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 582                         chacha.process(&packet_data, &mut buf[0..20*65]);
 583                         packet_data[..].copy_from_slice(&buf[0..20*65]);
 584
 585                         if i == 0 {
 586                                 packet_data[20*65 - filler.len()..20*65].copy_from_slice(&filler[..]);
 587                         }
 588
 589                         let mut hmac = Hmac::new(Sha256::new(), &keys.mu);
 590                         hmac.input(&packet_data);
 591                         hmac.input(&associated_data[..]);
 592                         hmac.raw_result(&mut hmac_res);
 593                 }
 594
 595                 Ok(msgs::OnionPacket{
 596                         version: 0,
 597                         public_key: onion_keys.first().unwrap().ephemeral_pubkey,
 598                         hop_data: packet_data,
 599                         hmac: hmac_res,
 600                 })
 601         }
 602
 603         /// Encrypts a failure packet. raw_packet can either be a
 604         /// msgs::DecodedOnionErrorPacket.encode() result or a msgs::OnionErrorPacket.data element.
 605         fn encrypt_failure_packet(shared_secret: &SharedSecret, raw_packet: &[u8]) -> msgs::OnionErrorPacket {
 606                 let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
 607
 608                 let mut packet_crypted = Vec::with_capacity(raw_packet.len());
 609                 packet_crypted.resize(raw_packet.len(), 0);
 610                 let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
 611                 chacha.process(&raw_packet, &mut packet_crypted[..]);
 612                 msgs::OnionErrorPacket {
 613                         data: packet_crypted,
 614                 }
 615         }
 616
 617         fn build_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::DecodedOnionErrorPacket {
 618                 assert!(failure_data.len() <= 256 - 2);
 619
 620                 let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
 621
 622                 let failuremsg = {
 623                         let mut res = Vec::with_capacity(2 + failure_data.len());
 624                         res.push(((failure_type >> 8) & 0xff) as u8);
 625                         res.push(((failure_type >> 0) & 0xff) as u8);
 626                         res.extend_from_slice(&failure_data[..]);
 627                         res
 628                 };
 629                 let pad = {
 630                         let mut res = Vec::with_capacity(256 - 2 - failure_data.len());
 631                         res.resize(256 - 2 - failure_data.len(), 0);
 632                         res
 633                 };
 634                 let mut packet = msgs::DecodedOnionErrorPacket {
 635                         hmac: [0; 32],
 636                         failuremsg: failuremsg,
 637                         pad: pad,
 638                 };
 639
 640                 let mut hmac = Hmac::new(Sha256::new(), &um);
 641                 hmac.input(&packet.encode()[32..]);
 642                 hmac.raw_result(&mut packet.hmac);
 643
 644                 packet
 645         }
 646
 647         #[inline]
 648         fn build_first_hop_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::OnionErrorPacket {
 649                 let failure_packet = ChannelManager::build_failure_packet(shared_secret, failure_type, failure_data);
 650                 ChannelManager::encrypt_failure_packet(shared_secret, &failure_packet.encode()[..])
 651         }
 652
 653         /// only fails if the channel does not yet have an assigned short_id
 654         fn get_channel_update(&self, chan: &Channel) -> Result<msgs::ChannelUpdate, HandleError> {
 655                 let short_channel_id = match chan.get_short_channel_id() {
 656                         None => return Err(HandleError{err: "Channel not yet established", action: None}),
 657                         Some(id) => id,
 658                 };
 659
 660                 let were_node_one = PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).unwrap().serialize()[..] < chan.get_their_node_id().serialize()[..];
 661
 662                 let unsigned = msgs::UnsignedChannelUpdate {
 663                         chain_hash: self.genesis_hash,
 664                         short_channel_id: short_channel_id,
 665                         timestamp: chan.get_channel_update_count(),
 666                         flags: (!were_node_one) as u16 | ((!chan.is_live() as u16) << 1),
 667                         cltv_expiry_delta: CLTV_EXPIRY_DELTA,
 668                         htlc_minimum_msat: chan.get_our_htlc_minimum_msat(),
 669                         fee_base_msat: chan.get_our_fee_base_msat(&*self.fee_estimator),
 670                         fee_proportional_millionths: self.fee_proportional_millionths,
 671                 };
 672
 673                 let msg_hash = Sha256dHash::from_data(&unsigned.encode()[..]);
 674                 let sig = self.secp_ctx.sign(&Message::from_slice(&msg_hash[..]).unwrap(), &self.our_network_key).unwrap(); //TODO Can we unwrap here?
 675
 676                 Ok(msgs::ChannelUpdate {
 677                         signature: sig,
 678                         contents: unsigned
 679                 })
 680         }
 681
 682         /// Sends a payment along a given route.
 683         /// Value parameters are provided via the last hop in route, see documentation for RouteHop
 684         /// fields for more info.
 685         /// Note that if the payment_hash already exists elsewhere (eg you're sending a duplicative
 686         /// payment), we don't do anything to stop you! We always try to ensure that if the provided
 687         /// next hop knows the preimage to payment_hash they can claim an additional amount as
 688         /// specified in the last hop in the route! Thus, you should probably do your own
 689         /// payment_preimage tracking (which you should already be doing as they represent "proof of
 690         /// payment") and prevent double-sends yourself.
 691         /// See-also docs on Channel::send_htlc_and_commit.
 692         /// May generate a SendHTLCs event on success, which should be relayed.
 693         pub fn send_payment(&self, route: Route, payment_hash: [u8; 32]) -> Result<(), HandleError> {
 694                 if route.hops.len() < 1 || route.hops.len() > 20 {
 695                         return Err(HandleError{err: "Route didn't go anywhere/had bogus size", action: None});
 696                 }
 697                 let our_node_id = self.get_our_node_id();
 698                 for (idx, hop) in route.hops.iter().enumerate() {
 699                         if idx != route.hops.len() - 1 && hop.pubkey == our_node_id {
 700                                 return Err(HandleError{err: "Route went through us but wasn't a simple rebalance loop to us", action: None});
 701                         }
 702                 }
 703
 704                 let session_priv = secp_call!(SecretKey::from_slice(&self.secp_ctx, &{
 705                         let mut session_key = [0; 32];
 706                         rng::fill_bytes(&mut session_key);
 707                         session_key
 708                 }));
 709
 710                 let cur_height = self.latest_block_height.load(Ordering::Acquire) as u32 + 1;
 711
 712                 let onion_keys = ChannelManager::construct_onion_keys(&self.secp_ctx, &route, &session_priv)?;
 713                 let (onion_payloads, htlc_msat, htlc_cltv) = ChannelManager::build_onion_payloads(&route, cur_height)?;
 714                 let onion_packet = ChannelManager::construct_onion_packet(onion_payloads, onion_keys, &payment_hash)?;
 715
 716                 let (first_hop_node_id, (update_add, commitment_signed, chan_monitor)) = {
 717                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 718                         let channel_state = channel_state_lock.borrow_parts();
 719
 720                         let id = match channel_state.short_to_id.get(&route.hops.first().unwrap().short_channel_id) {
 721                                 None => return Err(HandleError{err: "No channel available with first hop!", action: None}),
 722                                 Some(id) => id.clone()
 723                         };
 724
 725                         let claimable_htlc_entry = channel_state.claimable_htlcs.entry(payment_hash.clone());
 726                         if let hash_map::Entry::Occupied(_) = claimable_htlc_entry {
 727                                 return Err(HandleError{err: "Already had pending HTLC with the same payment_hash", action: None});
 728                         }
 729
 730                         let res = {
 731                                 let chan = channel_state.by_id.get_mut(&id).unwrap();
 732                                 if chan.get_their_node_id() != route.hops.first().unwrap().pubkey {
 733                                         return Err(HandleError{err: "Node ID mismatch on first hop!", action: None});
 734                                 }
 735                                 chan.send_htlc_and_commit(htlc_msat, payment_hash, htlc_cltv, onion_packet)?
 736                         };
 737
 738                         let first_hop_node_id = route.hops.first().unwrap().pubkey;
 739
 740                         claimable_htlc_entry.or_insert(PendingOutboundHTLC::OutboundRoute {
 741                                 route,
 742                                 session_priv,
 743                         });
 744
 745                         match res {
 746                                 Some(msgs) => (first_hop_node_id, msgs),
 747                                 None => return Ok(()),
 748                         }
 749                 };
 750
 751                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 752                         unimplemented!(); // maybe remove from claimable_htlcs?
 753                 }
 754
 755                 let mut events = self.pending_events.lock().unwrap();
 756                 events.push(events::Event::SendHTLCs {
 757                         node_id: first_hop_node_id,
 758                         msgs: vec![update_add],
 759                         commitment_msg: commitment_signed,
 760                 });
 761                 Ok(())
 762         }
 763
 764         /// Call this upon creation of a funding transaction for the given channel.
 765         /// Panics if a funding transaction has already been provided for this channel.
 766         pub fn funding_transaction_generated(&self, temporary_channel_id: &[u8; 32], funding_txo: OutPoint) {
 767                 macro_rules! add_pending_event {
 768                         ($event: expr) => {
 769                                 {
 770                                         let mut pending_events = self.pending_events.lock().unwrap();
 771                                         pending_events.push($event);
 772                                 }
 773                         }
 774                 }
 775
 776                 let (chan, msg, chan_monitor) = {
 777                         let mut channel_state = self.channel_state.lock().unwrap();
 778                         match channel_state.by_id.remove(temporary_channel_id) {
 779                                 Some(mut chan) => {
 780                                         match chan.get_outbound_funding_created(funding_txo) {
 781                                                 Ok(funding_msg) => {
 782                                                         (chan, funding_msg.0, funding_msg.1)
 783                                                 },
 784                                                 Err(e) => {
 785                                                         mem::drop(channel_state);
 786                                                         add_pending_event!(events::Event::DisconnectPeer {
 787                                                                 node_id: chan.get_their_node_id(),
 788                                                                 msg: if let Some(msgs::ErrorAction::DisconnectPeer { msg } ) = e.action { msg } else { None },
 789                                                         });
 790
 791                                                         return;
 792                                                 },
 793                                         }
 794                                 },
 795                                 None => return
 796                         }
 797                 }; // Release channel lock for install_watch_outpoint call,
 798                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 799                         unimplemented!(); // maybe remove from claimable_htlcs?
 800                 }
 801                 add_pending_event!(events::Event::SendFundingCreated {
 802                         node_id: chan.get_their_node_id(),
 803                         msg: msg,
 804                 });
 805
 806                 let mut channel_state = self.channel_state.lock().unwrap();
 807                 channel_state.by_id.insert(chan.channel_id(), chan);
 808         }
 809
 810         fn get_announcement_sigs(&self, chan: &Channel) -> Result<Option<msgs::AnnouncementSignatures>, HandleError> {
 811                 if !chan.is_usable() || !chan.should_announce() { return Ok(None) }
 812
 813                 let (announcement, our_bitcoin_sig) = chan.get_channel_announcement(self.get_our_node_id(), self.genesis_hash.clone())?;
 814                 let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
 815                 let our_node_sig = secp_call!(self.secp_ctx.sign(&msghash, &self.our_network_key));
 816
 817                 Ok(Some(msgs::AnnouncementSignatures {
 818                         channel_id: chan.channel_id(),
 819                         short_channel_id: chan.get_short_channel_id().unwrap(),
 820                         node_signature: our_node_sig,
 821                         bitcoin_signature: our_bitcoin_sig,
 822                 }))
 823         }
 824
 825         /// Processes HTLCs which are pending waiting on random forward delay.
 826         /// Should only really ever be called in response to an PendingHTLCsForwardable event.
 827         /// Will likely generate further events.
 828         pub fn process_pending_htlc_forwards(&self) {
 829                 let mut new_events = Vec::new();
 830                 let mut failed_forwards = Vec::new();
 831                 {
 832                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 833                         let channel_state = channel_state_lock.borrow_parts();
 834
 835                         if cfg!(not(feature = "fuzztarget")) && Instant::now() < *channel_state.next_forward {
 836                                 return;
 837                         }
 838
 839                         for (short_chan_id, pending_forwards) in channel_state.forward_htlcs.drain() {
 840                                 if short_chan_id != 0 {
 841                                         let forward_chan_id = match channel_state.short_to_id.get(&short_chan_id) {
 842                                                 Some(chan_id) => chan_id.clone(),
 843                                                 None => {
 844                                                         failed_forwards.reserve(pending_forwards.len());
 845                                                         for forward_info in pending_forwards {
 846                                                                 failed_forwards.push((forward_info.payment_hash, 0x4000 | 10, None));
 847                                                         }
 848                                                         continue;
 849                                                 }
 850                                         };
 851                                         let forward_chan = &mut channel_state.by_id.get_mut(&forward_chan_id).unwrap();
 852
 853                                         let mut add_htlc_msgs = Vec::new();
 854                                         for forward_info in pending_forwards {
 855                                                 match forward_chan.send_htlc(forward_info.amt_to_forward, forward_info.payment_hash, forward_info.outgoing_cltv_value, forward_info.onion_packet.unwrap()) {
 856                                                         Err(_e) => {
 857                                                                 let chan_update = self.get_channel_update(forward_chan).unwrap();
 858                                                                 failed_forwards.push((forward_info.payment_hash, 0x1000 | 7, Some(chan_update)));
 859                                                                 continue;
 860                                                         },
 861                                                         Ok(update_add) => {
 862                                                                 match update_add {
 863                                                                         Some(msg) => { add_htlc_msgs.push(msg); },
 864                                                                         None => {
 865                                                                                 // Nothing to do here...we're waiting on a remote
 866                                                                                 // revoke_and_ack before we can add anymore HTLCs. The Channel
 867                                                                                 // will automatically handle building the update_add_htlc and
 868                                                                                 // commitment_signed messages when we can.
 869                                                                                 // TODO: Do some kind of timer to set the channel as !is_live()
 870                                                                                 // as we don't really want others relying on us relaying through
 871                                                                                 // this channel currently :/.
 872                                                                         }
 873                                                                 }
 874                                                         }
 875                                                 }
 876                                         }
 877
 878                                         if !add_htlc_msgs.is_empty() {
 879                                                 let (commitment_msg, monitor) = match forward_chan.send_commitment() {
 880                                                         Ok(res) => res,
 881                                                         Err(_) => {
 882                                                                 //TODO: Handle...this is bad!
 883                                                                 continue;
 884                                                         },
 885                                                 };
 886                                                 new_events.push((Some(monitor), events::Event::SendHTLCs {
 887                                                         node_id: forward_chan.get_their_node_id(),
 888                                                         msgs: add_htlc_msgs,
 889                                                         commitment_msg: commitment_msg,
 890                                                 }));
 891                                         }
 892                                 } else {
 893                                         for forward_info in pending_forwards {
 894                                                 new_events.push((None, events::Event::PaymentReceived {
 895                                                         payment_hash: forward_info.payment_hash,
 896                                                         amt: forward_info.amt_to_forward,
 897                                                 }));
 898                                         }
 899                                 }
 900                         }
 901                 }
 902
 903                 for failed_forward in failed_forwards.drain(..) {
 904                         match failed_forward.2 {
 905                                 None => self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &failed_forward.0, HTLCFailReason::Reason { failure_code: failed_forward.1, data: Vec::new() }),
 906                                 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() }),
 907                         };
 908                 }
 909
 910                 if new_events.is_empty() { return }
 911
 912                 new_events.retain(|event| {
 913                         if let &Some(ref monitor) = &event.0 {
 914                                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor.clone()) {
 915                                         unimplemented!();// but def dont push the event...
 916                                 }
 917                         }
 918                         true
 919                 });
 920
 921                 let mut events = self.pending_events.lock().unwrap();
 922                 events.reserve(new_events.len());
 923                 for event in new_events.drain(..) {
 924                         events.push(event.1);
 925                 }
 926         }
 927
 928         /// Indicates that the preimage for payment_hash is unknown after a PaymentReceived event.
 929         pub fn fail_htlc_backwards(&self, payment_hash: &[u8; 32]) -> bool {
 930                 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 15, data: Vec::new() })
 931         }
 932
 933         /// Fails an HTLC backwards to the sender of it to us.
 934         /// Note that while we take a channel_state lock as input, we do *not* assume consistency here.
 935         /// There are several callsites that do stupid things like loop over a list of payment_hashes
 936         /// to fail and take the channel_state lock for each iteration (as we take ownership and may
 937         /// drop it). In other words, no assumptions are made that entries in claimable_htlcs point to
 938         /// still-available channels.
 939         fn fail_htlc_backwards_internal(&self, mut channel_state: MutexGuard<ChannelHolder>, payment_hash: &[u8; 32], onion_error: HTLCFailReason) -> bool {
 940                 let mut pending_htlc = {
 941                         match channel_state.claimable_htlcs.remove(payment_hash) {
 942                                 Some(pending_htlc) => pending_htlc,
 943                                 None => return false,
 944                         }
 945                 };
 946
 947                 match pending_htlc {
 948                         PendingOutboundHTLC::CycledRoute { source_short_channel_id, incoming_packet_shared_secret, route, session_priv } => {
 949                                 channel_state.claimable_htlcs.insert(payment_hash.clone(), PendingOutboundHTLC::OutboundRoute {
 950                                         route,
 951                                         session_priv,
 952                                 });
 953                                 pending_htlc = PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret };
 954                         },
 955                         _ => {}
 956                 }
 957
 958                 match pending_htlc {
 959                         PendingOutboundHTLC::CycledRoute { .. } => unreachable!(),
 960                         PendingOutboundHTLC::OutboundRoute { .. } => {
 961                                 mem::drop(channel_state);
 962
 963                                 let mut pending_events = self.pending_events.lock().unwrap();
 964                                 pending_events.push(events::Event::PaymentFailed {
 965                                         payment_hash: payment_hash.clone()
 966                                 });
 967                                 false
 968                         },
 969                         PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret } => {
 970                                 let err_packet = match onion_error {
 971                                         HTLCFailReason::Reason { failure_code, data } => {
 972                                                 let packet = ChannelManager::build_failure_packet(&incoming_packet_shared_secret, failure_code, &data[..]).encode();
 973                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &packet)
 974                                         },
 975                                         HTLCFailReason::ErrorPacket { err } => {
 976                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &err.data)
 977                                         }
 978                                 };
 979
 980                                 let (node_id, fail_msgs) = {
 981                                         let chan_id = match channel_state.short_to_id.get(&source_short_channel_id) {
 982                                                 Some(chan_id) => chan_id.clone(),
 983                                                 None => return false
 984                                         };
 985
 986                                         let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
 987                                         match chan.get_update_fail_htlc_and_commit(payment_hash, err_packet) {
 988                                                 Ok(msg) => (chan.get_their_node_id(), msg),
 989                                                 Err(_e) => {
 990                                                         //TODO: Do something with e?
 991                                                         return false;
 992                                                 },
 993                                         }
 994                                 };
 995
 996                                 match fail_msgs {
 997                                         Some((msg, commitment_msg, chan_monitor)) => {
 998                                                 mem::drop(channel_state);
 999
1000                                                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1001                                                         unimplemented!();// but def dont push the event...
1002                                                 }
1003
1004                                                 let mut pending_events = self.pending_events.lock().unwrap();
1005                                                 pending_events.push(events::Event::SendFailHTLC {
1006                                                         node_id,
1007                                                         msg: msg,
1008                                                         commitment_msg: commitment_msg,
1009                                                 });
1010                                         },
1011                                         None => {},
1012                                 }
1013
1014                                 true
1015                         },
1016                 }
1017         }
1018
1019         /// Provides a payment preimage in response to a PaymentReceived event, returning true and
1020         /// generating message events for the net layer to claim the payment, if possible. Thus, you
1021         /// should probably kick the net layer to go send messages if this returns true!
1022         /// May panic if called except in response to a PaymentReceived event.
1023         pub fn claim_funds(&self, payment_preimage: [u8; 32]) -> bool {
1024                 self.claim_funds_internal(payment_preimage, true)
1025         }
1026         fn claim_funds_internal(&self, payment_preimage: [u8; 32], from_user: bool) -> bool {
1027                 let mut sha = Sha256::new();
1028                 sha.input(&payment_preimage);
1029                 let mut payment_hash = [0; 32];
1030                 sha.result(&mut payment_hash);
1031
1032                 let mut channel_state = self.channel_state.lock().unwrap();
1033                 let mut pending_htlc = {
1034                         match channel_state.claimable_htlcs.remove(&payment_hash) {
1035                                 Some(pending_htlc) => pending_htlc,
1036                                 None => return false,
1037                         }
1038                 };
1039
1040                 match pending_htlc {
1041                         PendingOutboundHTLC::CycledRoute { source_short_channel_id, incoming_packet_shared_secret, route, session_priv } => {
1042                                 if from_user { // This was the end hop back to us
1043                                         pending_htlc = PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret };
1044                                         channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::OutboundRoute { route, session_priv });
1045                                 } else { // This came from the first upstream node
1046                                         // Bank error in our favor! Maybe we should tell the user this somehow???
1047                                         pending_htlc = PendingOutboundHTLC::OutboundRoute { route, session_priv };
1048                                         channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret });
1049                                 }
1050                         },
1051                         _ => {},
1052                 }
1053
1054                 match pending_htlc {
1055                         PendingOutboundHTLC::CycledRoute { .. } => unreachable!(),
1056                         PendingOutboundHTLC::OutboundRoute { .. } => {
1057                                 if from_user {
1058                                         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...");
1059                                 }
1060                                 mem::drop(channel_state);
1061                                 let mut pending_events = self.pending_events.lock().unwrap();
1062                                 pending_events.push(events::Event::PaymentSent {
1063                                         payment_preimage
1064                                 });
1065                                 false
1066                         },
1067                         PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, .. } => {
1068                                 let (node_id, fulfill_msgs) = {
1069                                         let chan_id = match channel_state.short_to_id.get(&source_short_channel_id) {
1070                                                 Some(chan_id) => chan_id.clone(),
1071                                                 None => {
1072                                                         // TODO: There is probably a channel manager somewhere that needs to
1073                                                         // learn the preimage as the channel already hit the chain and that's
1074                                                         // why its missing.
1075                                                         return false
1076                                                 }
1077                                         };
1078
1079                                         let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
1080                                         match chan.get_update_fulfill_htlc_and_commit(payment_preimage) {
1081                                                 Ok(msg) => (chan.get_their_node_id(), msg),
1082                                                 Err(_e) => {
1083                                                         // TODO: There is probably a channel manager somewhere that needs to
1084                                                         // learn the preimage as the channel may be about to hit the chain.
1085                                                         //TODO: Do something with e?
1086                                                         return false;
1087                                                 },
1088                                         }
1089                                 };
1090
1091                                 mem::drop(channel_state);
1092                                 if let Some(chan_monitor) = fulfill_msgs.1 {
1093                                         if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1094                                                 unimplemented!();// but def dont push the event...
1095                                         }
1096                                 }
1097
1098                                 if let Some((msg, commitment_msg)) = fulfill_msgs.0 {
1099                                         let mut pending_events = self.pending_events.lock().unwrap();
1100                                         pending_events.push(events::Event::SendFulfillHTLC {
1101                                                 node_id: node_id,
1102                                                 msg,
1103                                                 commitment_msg,
1104                                         });
1105                                 }
1106                                 true
1107                         },
1108                 }
1109         }
1110
1111         /// Gets the node_id held by this ChannelManager
1112         pub fn get_our_node_id(&self) -> PublicKey {
1113                 PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).unwrap()
1114         }
1115
1116         /// Used to restore channels to normal operation after a
1117         /// ChannelMonitorUpdateErr::TemporaryFailure was returned from a channel monitor update
1118         /// operation.
1119         pub fn test_restore_channel_monitor(&self) {
1120                 unimplemented!();
1121         }
1122 }
1123
1124 impl events::EventsProvider for ChannelManager {
1125         fn get_and_clear_pending_events(&self) -> Vec<events::Event> {
1126                 let mut pending_events = self.pending_events.lock().unwrap();
1127                 let mut ret = Vec::new();
1128                 mem::swap(&mut ret, &mut *pending_events);
1129                 ret
1130         }
1131 }
1132
1133 impl ChainListener for ChannelManager {
1134         fn block_connected(&self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) {
1135                 let mut new_events = Vec::new();
1136                 let mut failed_channels = Vec::new();
1137                 {
1138                         let mut channel_lock = self.channel_state.lock().unwrap();
1139                         let channel_state = channel_lock.borrow_parts();
1140                         let short_to_id = channel_state.short_to_id;
1141                         channel_state.by_id.retain(|_, channel| {
1142                                 if let Some(funding_locked) = channel.block_connected(header, height, txn_matched, indexes_of_txn_matched) {
1143                                         let announcement_sigs = match self.get_announcement_sigs(channel) {
1144                                                 Ok(res) => res,
1145                                                 Err(_e) => {
1146                                                         //TODO: push e on events and blow up the channel (it has bad keys)
1147                                                         return true;
1148                                                 }
1149                                         };
1150                                         new_events.push(events::Event::SendFundingLocked {
1151                                                 node_id: channel.get_their_node_id(),
1152                                                 msg: funding_locked,
1153                                                 announcement_sigs: announcement_sigs
1154                                         });
1155                                         short_to_id.insert(channel.get_short_channel_id().unwrap(), channel.channel_id());
1156                                 }
1157                                 if let Some(funding_txo) = channel.get_funding_txo() {
1158                                         for tx in txn_matched {
1159                                                 for inp in tx.input.iter() {
1160                                                         if inp.prev_hash == funding_txo.txid && inp.prev_index == funding_txo.index as u32 {
1161                                                                 if let Some(short_id) = channel.get_short_channel_id() {
1162                                                                         short_to_id.remove(&short_id);
1163                                                                 }
1164                                                                 // It looks like our counterparty went on-chain. We go ahead and
1165                                                                 // broadcast our latest local state as well here, just in case its
1166                                                                 // some kind of SPV attack, though we expect these to be dropped.
1167                                                                 failed_channels.push(channel.force_shutdown());
1168                                                                 if let Ok(update) = self.get_channel_update(&channel) {
1169                                                                         new_events.push(events::Event::BroadcastChannelUpdate {
1170                                                                                 msg: update
1171                                                                         });
1172                                                                 }
1173                                                                 return false;
1174                                                         }
1175                                                 }
1176                                         }
1177                                 }
1178                                 if channel.channel_monitor().would_broadcast_at_height(height) {
1179                                         if let Some(short_id) = channel.get_short_channel_id() {
1180                                                 short_to_id.remove(&short_id);
1181                                         }
1182                                         failed_channels.push(channel.force_shutdown());
1183                                         // If would_broadcast_at_height() is true, the channel_monitor will broadcast
1184                                         // the latest local tx for us, so we should skip that here (it doesn't really
1185                                         // hurt anything, but does make tests a bit simpler).
1186                                         failed_channels.last_mut().unwrap().0 = Vec::new();
1187                                         if let Ok(update) = self.get_channel_update(&channel) {
1188                                                 new_events.push(events::Event::BroadcastChannelUpdate {
1189                                                         msg: update
1190                                                 });
1191                                         }
1192                                         return false;
1193                                 }
1194                                 true
1195                         });
1196                 }
1197                 for failure in failed_channels.drain(..) {
1198                         self.finish_force_close_channel(failure);
1199                 }
1200                 let mut pending_events = self.pending_events.lock().unwrap();
1201                 for funding_locked in new_events.drain(..) {
1202                         pending_events.push(funding_locked);
1203                 }
1204                 self.latest_block_height.store(height as usize, Ordering::Release);
1205         }
1206
1207         /// We force-close the channel without letting our counterparty participate in the shutdown
1208         fn block_disconnected(&self, header: &BlockHeader) {
1209                 let mut new_events = Vec::new();
1210                 let mut failed_channels = Vec::new();
1211                 {
1212                         let mut channel_lock = self.channel_state.lock().unwrap();
1213                         let channel_state = channel_lock.borrow_parts();
1214                         let short_to_id = channel_state.short_to_id;
1215                         channel_state.by_id.retain(|_,  v| {
1216                                 if v.block_disconnected(header) {
1217                                         if let Some(short_id) = v.get_short_channel_id() {
1218                                                 short_to_id.remove(&short_id);
1219                                         }
1220                                         failed_channels.push(v.force_shutdown());
1221                                         if let Ok(update) = self.get_channel_update(&v) {
1222                                                 new_events.push(events::Event::BroadcastChannelUpdate {
1223                                                         msg: update
1224                                                 });
1225                                         }
1226                                         false
1227                                 } else {
1228                                         true
1229                                 }
1230                         });
1231                 }
1232                 for failure in failed_channels.drain(..) {
1233                         self.finish_force_close_channel(failure);
1234                 }
1235                 if !new_events.is_empty() {
1236                         let mut pending_events = self.pending_events.lock().unwrap();
1237                         for funding_locked in new_events.drain(..) {
1238                                 pending_events.push(funding_locked);
1239                         }
1240                 }
1241                 self.latest_block_height.fetch_sub(1, Ordering::AcqRel);
1242         }
1243 }
1244
1245 impl ChannelMessageHandler for ChannelManager {
1246         //TODO: Handle errors and close channel (or so)
1247         fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &msgs::OpenChannel) -> Result<msgs::AcceptChannel, HandleError> {
1248                 if msg.chain_hash != self.genesis_hash {
1249                         return Err(HandleError{err: "Unknown genesis block hash", action: None});
1250                 }
1251                 let mut channel_state = self.channel_state.lock().unwrap();
1252                 if channel_state.by_id.contains_key(&msg.temporary_channel_id) {
1253                         return Err(HandleError{err: "temporary_channel_id collision!", action: None});
1254                 }
1255
1256                 let chan_keys = if cfg!(feature = "fuzztarget") {
1257                         ChannelKeys {
1258                                 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(),
1259                                 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(),
1260                                 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(),
1261                                 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(),
1262                                 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(),
1263                                 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(),
1264                                 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(),
1265                                 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],
1266                         }
1267                 } else {
1268                         let mut key_seed = [0u8; 32];
1269                         rng::fill_bytes(&mut key_seed);
1270                         match ChannelKeys::new_from_seed(&key_seed) {
1271                                 Ok(key) => key,
1272                                 Err(_) => panic!("RNG is busted!")
1273                         }
1274                 };
1275
1276                 let channel = Channel::new_from_req(&*self.fee_estimator, chan_keys, their_node_id.clone(), msg, 0, false, self.announce_channels_publicly)?;
1277                 let accept_msg = channel.get_accept_channel()?;
1278                 channel_state.by_id.insert(channel.channel_id(), channel);
1279                 Ok(accept_msg)
1280         }
1281
1282         fn handle_accept_channel(&self, their_node_id: &PublicKey, msg: &msgs::AcceptChannel) -> Result<(), HandleError> {
1283                 let (value, output_script, user_id) = {
1284                         let mut channel_state = self.channel_state.lock().unwrap();
1285                         match channel_state.by_id.get_mut(&msg.temporary_channel_id) {
1286                                 Some(chan) => {
1287                                         if chan.get_their_node_id() != *their_node_id {
1288                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1289                                         }
1290                                         chan.accept_channel(&msg)?;
1291                                         (chan.get_value_satoshis(), chan.get_funding_redeemscript().to_v0_p2wsh(), chan.get_user_id())
1292                                 },
1293                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1294                         }
1295                 };
1296                 let mut pending_events = self.pending_events.lock().unwrap();
1297                 pending_events.push(events::Event::FundingGenerationReady {
1298                         temporary_channel_id: msg.temporary_channel_id,
1299                         channel_value_satoshis: value,
1300                         output_script: output_script,
1301                         user_channel_id: user_id,
1302                 });
1303                 Ok(())
1304         }
1305
1306         fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) -> Result<msgs::FundingSigned, HandleError> {
1307                 //TODO: broke this - a node shouldn't be able to get their channel removed by sending a
1308                 //funding_created a second time, or long after the first, or whatever (note this also
1309                 //leaves the short_to_id map in a busted state.
1310                 let (chan, funding_msg, monitor_update) = {
1311                         let mut channel_state = self.channel_state.lock().unwrap();
1312                         match channel_state.by_id.remove(&msg.temporary_channel_id) {
1313                                 Some(mut chan) => {
1314                                         if chan.get_their_node_id() != *their_node_id {
1315                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1316                                         }
1317                                         match chan.funding_created(msg) {
1318                                                 Ok((funding_msg, monitor_update)) => {
1319                                                         (chan, funding_msg, monitor_update)
1320                                                 },
1321                                                 Err(e) => {
1322                                                         return Err(e);
1323                                                 }
1324                                         }
1325                                 },
1326                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1327                         }
1328                 }; // Release channel lock for install_watch_outpoint call,
1329                    // note that this means if the remote end is misbehaving and sends a message for the same
1330                    // channel back-to-back with funding_created, we'll end up thinking they sent a message
1331                    // for a bogus channel.
1332                 if let Err(_e) = self.monitor.add_update_monitor(monitor_update.get_funding_txo().unwrap(), monitor_update) {
1333                         unimplemented!();
1334                 }
1335                 let mut channel_state = self.channel_state.lock().unwrap();
1336                 channel_state.by_id.insert(funding_msg.channel_id, chan);
1337                 Ok(funding_msg)
1338         }
1339
1340         fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) -> Result<(), HandleError> {
1341                 let (funding_txo, user_id, monitor) = {
1342                         let mut channel_state = self.channel_state.lock().unwrap();
1343                         match channel_state.by_id.get_mut(&msg.channel_id) {
1344                                 Some(chan) => {
1345                                         if chan.get_their_node_id() != *their_node_id {
1346                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1347                                         }
1348                                         let chan_monitor = chan.funding_signed(&msg)?;
1349                                         (chan.get_funding_txo().unwrap(), chan.get_user_id(), chan_monitor)
1350                                 },
1351                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1352                         }
1353                 };
1354                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor) {
1355                         unimplemented!();
1356                 }
1357                 let mut pending_events = self.pending_events.lock().unwrap();
1358                 pending_events.push(events::Event::FundingBroadcastSafe {
1359                         funding_txo: funding_txo,
1360                         user_channel_id: user_id,
1361                 });
1362                 Ok(())
1363         }
1364
1365         fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &msgs::FundingLocked) -> Result<Option<msgs::AnnouncementSignatures>, HandleError> {
1366                 let mut channel_state = self.channel_state.lock().unwrap();
1367                 match channel_state.by_id.get_mut(&msg.channel_id) {
1368                         Some(chan) => {
1369                                 if chan.get_their_node_id() != *their_node_id {
1370                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1371                                 }
1372                                 chan.funding_locked(&msg)?;
1373                                 return Ok(self.get_announcement_sigs(chan)?);
1374                         },
1375                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1376                 };
1377         }
1378
1379         fn handle_shutdown(&self, their_node_id: &PublicKey, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>), HandleError> {
1380                 let (res, chan_option) = {
1381                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1382                         let channel_state = channel_state_lock.borrow_parts();
1383
1384                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1385                                 hash_map::Entry::Occupied(mut chan_entry) => {
1386                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1387                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1388                                         }
1389                                         let res = chan_entry.get_mut().shutdown(&*self.fee_estimator, &msg)?;
1390                                         if chan_entry.get().is_shutdown() {
1391                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
1392                                                         channel_state.short_to_id.remove(&short_id);
1393                                                 }
1394                                                 (res, Some(chan_entry.remove_entry().1))
1395                                         } else { (res, None) }
1396                                 },
1397                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1398                         }
1399                 };
1400                 for payment_hash in res.2 {
1401                         // unknown_next_peer...I dunno who that is anymore....
1402                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
1403                 }
1404                 if let Some(chan) = chan_option {
1405                         if let Ok(update) = self.get_channel_update(&chan) {
1406                                 let mut events = self.pending_events.lock().unwrap();
1407                                 events.push(events::Event::BroadcastChannelUpdate {
1408                                         msg: update
1409                                 });
1410                         }
1411                 }
1412                 Ok((res.0, res.1))
1413         }
1414
1415         fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &msgs::ClosingSigned) -> Result<Option<msgs::ClosingSigned>, HandleError> {
1416                 let (res, chan_option) = {
1417                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1418                         let channel_state = channel_state_lock.borrow_parts();
1419                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1420                                 hash_map::Entry::Occupied(mut chan_entry) => {
1421                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1422                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1423                                         }
1424                                         let res = chan_entry.get_mut().closing_signed(&*self.fee_estimator, &msg)?;
1425                                         if res.1.is_some() {
1426                                                 // We're done with this channel, we've got a signed closing transaction and
1427                                                 // will send the closing_signed back to the remote peer upon return. This
1428                                                 // also implies there are no pending HTLCs left on the channel, so we can
1429                                                 // fully delete it from tracking (the channel monitor is still around to
1430                                                 // watch for old state broadcasts)!
1431                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
1432                                                         channel_state.short_to_id.remove(&short_id);
1433                                                 }
1434                                                 (res, Some(chan_entry.remove_entry().1))
1435                                         } else { (res, None) }
1436                                 },
1437                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1438                         }
1439                 };
1440                 if let Some(broadcast_tx) = res.1 {
1441                         self.tx_broadcaster.broadcast_transaction(&broadcast_tx);
1442                 }
1443                 if let Some(chan) = chan_option {
1444                         if let Ok(update) = self.get_channel_update(&chan) {
1445                                 let mut events = self.pending_events.lock().unwrap();
1446                                 events.push(events::Event::BroadcastChannelUpdate {
1447                                         msg: update
1448                                 });
1449                         }
1450                 }
1451                 Ok(res.0)
1452         }
1453
1454         fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) -> Result<(), msgs::HandleError> {
1455                 //TODO: BOLT 4 points out a specific attack where a peer may re-send an onion packet and
1456                 //determine the state of the payment based on our response/if we forward anything/the time
1457                 //we take to respond. We should take care to avoid allowing such an attack.
1458                 //
1459                 //TODO: There exists a further attack where a node may garble the onion data, forward it to
1460                 //us repeatedly garbled in different ways, and compare our error messages, which are
1461                 //encrypted with the same key. Its not immediately obvious how to usefully exploit that,
1462                 //but we should prevent it anyway.
1463
1464                 let shared_secret = SharedSecret::new(&self.secp_ctx, &msg.onion_routing_packet.public_key, &self.our_network_key);
1465                 let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
1466
1467                 macro_rules! get_onion_hash {
1468                         () => {
1469                                 {
1470                                         let mut sha = Sha256::new();
1471                                         sha.input(&msg.onion_routing_packet.hop_data);
1472                                         let mut onion_hash = [0; 32];
1473                                         sha.result(&mut onion_hash);
1474                                         onion_hash
1475                                 }
1476                         }
1477                 }
1478
1479                 macro_rules! return_err {
1480                         ($msg: expr, $err_code: expr, $data: expr) => {
1481                                 return Err(msgs::HandleError {
1482                                         err: $msg,
1483                                         action: Some(msgs::ErrorAction::UpdateFailHTLC {
1484                                                 msg: msgs::UpdateFailHTLC {
1485                                                         channel_id: msg.channel_id,
1486                                                         htlc_id: msg.htlc_id,
1487                                                         reason: ChannelManager::build_first_hop_failure_packet(&shared_secret, $err_code, $data),
1488                                                 }
1489                                         }),
1490                                 });
1491                         }
1492                 }
1493
1494                 if msg.onion_routing_packet.version != 0 {
1495                         //TODO: Spec doesn't indicate if we should only hash hop_data here (and in other
1496                         //sha256_of_onion error data packets), or the entire onion_routing_packet. Either way,
1497                         //the hash doesn't really serve any purpuse - in the case of hashing all data, the
1498                         //receiving node would have to brute force to figure out which version was put in the
1499                         //packet by the node that send us the message, in the case of hashing the hop_data, the
1500                         //node knows the HMAC matched, so they already know what is there...
1501                         return_err!("Unknown onion packet version", 0x8000 | 0x4000 | 4, &get_onion_hash!());
1502                 }
1503
1504                 let mut hmac = Hmac::new(Sha256::new(), &mu);
1505                 hmac.input(&msg.onion_routing_packet.hop_data);
1506                 hmac.input(&msg.payment_hash);
1507                 if hmac.result() != MacResult::new(&msg.onion_routing_packet.hmac) {
1508                         return_err!("HMAC Check failed", 0x8000 | 0x4000 | 5, &get_onion_hash!());
1509                 }
1510
1511                 let mut chacha = ChaCha20::new(&rho, &[0u8; 8]);
1512                 let next_hop_data = {
1513                         let mut decoded = [0; 65];
1514                         chacha.process(&msg.onion_routing_packet.hop_data[0..65], &mut decoded);
1515                         match msgs::OnionHopData::decode(&decoded[..]) {
1516                                 Err(err) => {
1517                                         let error_code = match err {
1518                                                 msgs::DecodeError::UnknownRealmByte => 0x4000 | 1,
1519                                                 _ => 0x2000 | 2, // Should never happen
1520                                         };
1521                                         return_err!("Unable to decode our hop data", error_code, &[0;0]);
1522                                 },
1523                                 Ok(msg) => msg
1524                         }
1525                 };
1526
1527                 //TODO: Check that msg.cltv_expiry is within acceptable bounds!
1528
1529                 let mut pending_forward_info = if next_hop_data.hmac == [0; 32] {
1530                                 // OUR PAYMENT!
1531                                 if next_hop_data.data.amt_to_forward != msg.amount_msat {
1532                                         return_err!("Upstream node sent less than we were supposed to receive in payment", 19, &byte_utils::be64_to_array(msg.amount_msat));
1533                                 }
1534                                 if next_hop_data.data.outgoing_cltv_value != msg.cltv_expiry {
1535                                         return_err!("Upstream node set CLTV to the wrong value", 18, &byte_utils::be32_to_array(msg.cltv_expiry));
1536                                 }
1537
1538                                 // Note that we could obviously respond immediately with an update_fulfill_htlc
1539                                 // message, however that would leak that we are the recipient of this payment, so
1540                                 // instead we stay symmetric with the forwarding case, only responding (after a
1541                                 // delay) once they've send us a commitment_signed!
1542
1543                                 PendingForwardHTLCInfo {
1544                                         onion_packet: None,
1545                                         payment_hash: msg.payment_hash.clone(),
1546                                         short_channel_id: 0,
1547                                         prev_short_channel_id: 0,
1548                                         amt_to_forward: next_hop_data.data.amt_to_forward,
1549                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
1550                                 }
1551                         } else {
1552                                 let mut new_packet_data = [0; 20*65];
1553                                 chacha.process(&msg.onion_routing_packet.hop_data[65..], &mut new_packet_data[0..19*65]);
1554                                 chacha.process(&ChannelManager::ZERO[0..65], &mut new_packet_data[19*65..]);
1555
1556                                 let mut new_pubkey = msg.onion_routing_packet.public_key.clone();
1557
1558                                 let blinding_factor = {
1559                                         let mut sha = Sha256::new();
1560                                         sha.input(&new_pubkey.serialize()[..]);
1561                                         sha.input(&shared_secret[..]);
1562                                         let mut res = [0u8; 32];
1563                                         sha.result(&mut res);
1564                                         match SecretKey::from_slice(&self.secp_ctx, &res) {
1565                                                 Err(_) => {
1566                                                         // Return temporary node failure as its technically our issue, not the
1567                                                         // channel's issue.
1568                                                         return_err!("Blinding factor is an invalid private key", 0x2000 | 2, &[0;0]);
1569                                                 },
1570                                                 Ok(key) => key
1571                                         }
1572                                 };
1573
1574                                 match new_pubkey.mul_assign(&self.secp_ctx, &blinding_factor) {
1575                                         Err(_) => {
1576                                                 // Return temporary node failure as its technically our issue, not the
1577                                                 // channel's issue.
1578                                                 return_err!("New blinding factor is an invalid private key", 0x2000 | 2, &[0;0]);
1579                                         },
1580                                         Ok(_) => {}
1581                                 };
1582
1583                                 let outgoing_packet = msgs::OnionPacket {
1584                                         version: 0,
1585                                         public_key: new_pubkey,
1586                                         hop_data: new_packet_data,
1587                                         hmac: next_hop_data.hmac.clone(),
1588                                 };
1589
1590                                 //TODO: Check amt_to_forward and outgoing_cltv_value are within acceptable ranges!
1591
1592                                 PendingForwardHTLCInfo {
1593                                         onion_packet: Some(outgoing_packet),
1594                                         payment_hash: msg.payment_hash.clone(),
1595                                         short_channel_id: next_hop_data.data.short_channel_id,
1596                                         prev_short_channel_id: 0,
1597                                         amt_to_forward: next_hop_data.data.amt_to_forward,
1598                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
1599                                 }
1600                         };
1601
1602                 let mut channel_state_lock = self.channel_state.lock().unwrap();
1603                 let channel_state = channel_state_lock.borrow_parts();
1604
1605                 if pending_forward_info.onion_packet.is_some() { // If short_channel_id is 0 here, we'll reject them in the body here
1606                         let forwarding_id = match channel_state.short_to_id.get(&pending_forward_info.short_channel_id) {
1607                                 None => {
1608                                         return_err!("Don't have available channel for forwarding as requested.", 0x4000 | 10, &[0;0]);
1609                                 },
1610                                 Some(id) => id.clone(),
1611                         };
1612                         let chan = channel_state.by_id.get_mut(&forwarding_id).unwrap();
1613                         if !chan.is_live() {
1614                                 let chan_update = self.get_channel_update(chan).unwrap();
1615                                 return_err!("Forwarding channel is not in a ready state.", 0x1000 | 7, &chan_update.encode_with_len()[..]);
1616                         }
1617                 }
1618
1619                 let claimable_htlcs_entry = channel_state.claimable_htlcs.entry(msg.payment_hash.clone());
1620
1621                 // We dont correctly handle payments that route through us twice on their way to their
1622                 // destination. That's OK since those nodes are probably busted or trying to do network
1623                 // mapping through repeated loops. In either case, we want them to stop talking to us, so
1624                 // we send permanent_node_failure.
1625                 match &claimable_htlcs_entry {
1626                         &hash_map::Entry::Occupied(ref e) => {
1627                                 let mut acceptable_cycle = false;
1628                                 match e.get() {
1629                                         &PendingOutboundHTLC::OutboundRoute { .. } => {
1630                                                 acceptable_cycle = pending_forward_info.short_channel_id == 0;
1631                                         },
1632                                         _ => {},
1633                                 }
1634                                 if !acceptable_cycle {
1635                                         return_err!("Payment looped through us twice", 0x4000 | 0x2000 | 2, &[0;0]);
1636                                 }
1637                         },
1638                         _ => {},
1639                 }
1640
1641                 let (source_short_channel_id, res) = match channel_state.by_id.get_mut(&msg.channel_id) {
1642                         Some(chan) => {
1643                                 if chan.get_their_node_id() != *their_node_id {
1644                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1645                                 }
1646                                 if !chan.is_usable() {
1647                                         return Err(HandleError{err: "Channel not yet available for receiving HTLCs", action: None});
1648                                 }
1649                                 let short_channel_id = chan.get_short_channel_id().unwrap();
1650                                 pending_forward_info.prev_short_channel_id = short_channel_id;
1651                                 (short_channel_id, chan.update_add_htlc(&msg, pending_forward_info)?)
1652                         },
1653                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None}),
1654                 };
1655
1656                 match claimable_htlcs_entry {
1657                         hash_map::Entry::Occupied(mut e) => {
1658                                 let outbound_route = e.get_mut();
1659                                 let (route, session_priv) = match outbound_route {
1660                                         &mut PendingOutboundHTLC::OutboundRoute { ref route, ref session_priv } => {
1661                                                 (route.clone(), session_priv.clone())
1662                                         },
1663                                         _ => unreachable!(),
1664                                 };
1665                                 *outbound_route = PendingOutboundHTLC::CycledRoute {
1666                                         source_short_channel_id,
1667                                         incoming_packet_shared_secret: shared_secret,
1668                                         route,
1669                                         session_priv,
1670                                 };
1671                         },
1672                         hash_map::Entry::Vacant(e) => {
1673                                 e.insert(PendingOutboundHTLC::IntermediaryHopData {
1674                                         source_short_channel_id,
1675                                         incoming_packet_shared_secret: shared_secret,
1676                                 });
1677                         }
1678                 }
1679
1680                 Ok(res)
1681         }
1682
1683         fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) -> Result<(), HandleError> {
1684                 //TODO: Delay the claimed_funds relaying just like we do outbound relay!
1685                 // Claim funds first, cause we don't really care if the channel we received the message on
1686                 // is broken, we may have enough info to get our own money!
1687                 self.claim_funds_internal(msg.payment_preimage.clone(), false);
1688
1689                 let monitor = {
1690                         let mut channel_state = self.channel_state.lock().unwrap();
1691                         match channel_state.by_id.get_mut(&msg.channel_id) {
1692                                 Some(chan) => {
1693                                         if chan.get_their_node_id() != *their_node_id {
1694                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1695                                         }
1696                                         chan.update_fulfill_htlc(&msg)?
1697                                 },
1698                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1699                         }
1700                 };
1701                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor) {
1702                         unimplemented!();
1703                 }
1704                 Ok(())
1705         }
1706
1707         fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) -> Result<Option<msgs::HTLCFailChannelUpdate>, HandleError> {
1708                 let mut channel_state = self.channel_state.lock().unwrap();
1709                 let payment_hash = match channel_state.by_id.get_mut(&msg.channel_id) {
1710                         Some(chan) => {
1711                                 if chan.get_their_node_id() != *their_node_id {
1712                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1713                                 }
1714                                 chan.update_fail_htlc(&msg, HTLCFailReason::ErrorPacket { err: msg.reason.clone() })
1715                         },
1716                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1717                 }?;
1718
1719                 if let Some(pending_htlc) = channel_state.claimable_htlcs.get(&payment_hash) {
1720                         match pending_htlc {
1721                                 &PendingOutboundHTLC::OutboundRoute { ref route, ref session_priv } => {
1722                                         // Handle packed channel/node updates for passing back for the route handler
1723                                         let mut packet_decrypted = msg.reason.data.clone();
1724                                         let mut res = None;
1725                                         Self::construct_onion_keys_callback(&self.secp_ctx, &route, &session_priv, |shared_secret, _, _, route_hop| {
1726                                                 if res.is_some() { return; }
1727
1728                                                 let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
1729
1730                                                 let mut decryption_tmp = Vec::with_capacity(packet_decrypted.len());
1731                                                 decryption_tmp.resize(packet_decrypted.len(), 0);
1732                                                 let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
1733                                                 chacha.process(&packet_decrypted, &mut decryption_tmp[..]);
1734                                                 packet_decrypted = decryption_tmp;
1735
1736                                                 if let Ok(err_packet) = msgs::DecodedOnionErrorPacket::decode(&packet_decrypted) {
1737                                                         if err_packet.failuremsg.len() >= 2 {
1738                                                                 let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
1739
1740                                                                 let mut hmac = Hmac::new(Sha256::new(), &um);
1741                                                                 hmac.input(&err_packet.encode()[32..]);
1742                                                                 let mut calc_tag = [0u8; 32];
1743                                                                 hmac.raw_result(&mut calc_tag);
1744                                                                 if crypto::util::fixed_time_eq(&calc_tag, &err_packet.hmac) {
1745                                                                         const UNKNOWN_CHAN: u16 = 0x4000|10;
1746                                                                         const TEMP_CHAN_FAILURE: u16 = 0x4000|7;
1747                                                                         match byte_utils::slice_to_be16(&err_packet.failuremsg[0..2]) {
1748                                                                                 TEMP_CHAN_FAILURE => {
1749                                                                                         if err_packet.failuremsg.len() >= 4 {
1750                                                                                                 let update_len = byte_utils::slice_to_be16(&err_packet.failuremsg[2..4]) as usize;
1751                                                                                                 if err_packet.failuremsg.len() >= 4 + update_len {
1752                                                                                                         if let Ok(chan_update) = msgs::ChannelUpdate::decode(&err_packet.failuremsg[4..4 + update_len]) {
1753                                                                                                                 res = Some(msgs::HTLCFailChannelUpdate::ChannelUpdateMessage {
1754                                                                                                                         msg: chan_update,
1755                                                                                                                 });
1756                                                                                                         }
1757                                                                                                 }
1758                                                                                         }
1759                                                                                 },
1760                                                                                 UNKNOWN_CHAN => {
1761                                                                                         // No such next-hop. We know this came from the
1762                                                                                         // current node as the HMAC validated.
1763                                                                                         res = Some(msgs::HTLCFailChannelUpdate::ChannelClosed {
1764                                                                                                 short_channel_id: route_hop.short_channel_id
1765                                                                                         });
1766                                                                                 },
1767                                                                                 _ => {}, //TODO: Enumerate all of these!
1768                                                                         }
1769                                                                 }
1770                                                         }
1771                                                 }
1772                                         }).unwrap();
1773                                         Ok(res)
1774                                 },
1775                                 _ => { Ok(None) },
1776                         }
1777                 } else {
1778                         Ok(None)
1779                 }
1780         }
1781
1782         fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) -> Result<(), HandleError> {
1783                 let mut channel_state = self.channel_state.lock().unwrap();
1784                 match channel_state.by_id.get_mut(&msg.channel_id) {
1785                         Some(chan) => {
1786                                 if chan.get_their_node_id() != *their_node_id {
1787                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1788                                 }
1789                                 chan.update_fail_malformed_htlc(&msg, HTLCFailReason::Reason { failure_code: msg.failure_code, data: Vec::new() })
1790                         },
1791                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1792                 }
1793         }
1794
1795         fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>), HandleError> {
1796                 let (revoke_and_ack, commitment_signed, chan_monitor) = {
1797                         let mut channel_state = self.channel_state.lock().unwrap();
1798                         match channel_state.by_id.get_mut(&msg.channel_id) {
1799                                 Some(chan) => {
1800                                         if chan.get_their_node_id() != *their_node_id {
1801                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1802                                         }
1803                                         chan.commitment_signed(&msg)?
1804                                 },
1805                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1806                         }
1807                 };
1808                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1809                         unimplemented!();
1810                 }
1811
1812                 Ok((revoke_and_ack, commitment_signed))
1813         }
1814
1815         fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) -> Result<Option<msgs::CommitmentUpdate>, HandleError> {
1816                 let (res, mut pending_forwards, mut pending_failures, chan_monitor) = {
1817                         let mut channel_state = self.channel_state.lock().unwrap();
1818                         match channel_state.by_id.get_mut(&msg.channel_id) {
1819                                 Some(chan) => {
1820                                         if chan.get_their_node_id() != *their_node_id {
1821                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1822                                         }
1823                                         chan.revoke_and_ack(&msg)?
1824                                 },
1825                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1826                         }
1827                 };
1828                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1829                         unimplemented!();
1830                 }
1831                 for failure in pending_failures.drain(..) {
1832                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &failure.0, failure.1);
1833                 }
1834
1835                 let mut forward_event = None;
1836                 if !pending_forwards.is_empty() {
1837                         let mut channel_state = self.channel_state.lock().unwrap();
1838                         if channel_state.forward_htlcs.is_empty() {
1839                                 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));
1840                                 channel_state.next_forward = forward_event.unwrap();
1841                         }
1842                         for forward_info in pending_forwards.drain(..) {
1843                                 match channel_state.forward_htlcs.entry(forward_info.short_channel_id) {
1844                                         hash_map::Entry::Occupied(mut entry) => {
1845                                                 entry.get_mut().push(forward_info);
1846                                         },
1847                                         hash_map::Entry::Vacant(entry) => {
1848                                                 entry.insert(vec!(forward_info));
1849                                         }
1850                                 }
1851                         }
1852                 }
1853                 match forward_event {
1854                         Some(time) => {
1855                                 let mut pending_events = self.pending_events.lock().unwrap();
1856                                 pending_events.push(events::Event::PendingHTLCsForwardable {
1857                                         time_forwardable: time
1858                                 });
1859                         }
1860                         None => {},
1861                 }
1862
1863                 Ok(res)
1864         }
1865
1866         fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) -> Result<(), HandleError> {
1867                 let mut channel_state = self.channel_state.lock().unwrap();
1868                 match channel_state.by_id.get_mut(&msg.channel_id) {
1869                         Some(chan) => {
1870                                 if chan.get_their_node_id() != *their_node_id {
1871                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1872                                 }
1873                                 chan.update_fee(&*self.fee_estimator, &msg)
1874                         },
1875                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1876                 }
1877         }
1878
1879         fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) -> Result<(), HandleError> {
1880                 let (chan_announcement, chan_update) = {
1881                         let mut channel_state = self.channel_state.lock().unwrap();
1882                         match channel_state.by_id.get_mut(&msg.channel_id) {
1883                                 Some(chan) => {
1884                                         if chan.get_their_node_id() != *their_node_id {
1885                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1886                                         }
1887                                         if !chan.is_usable() {
1888                                                 return Err(HandleError{err: "Got an announcement_signatures before we were ready for it", action: None });
1889                                         }
1890
1891                                         let our_node_id = self.get_our_node_id();
1892                                         let (announcement, our_bitcoin_sig) = chan.get_channel_announcement(our_node_id.clone(), self.genesis_hash.clone())?;
1893
1894                                         let were_node_one = announcement.node_id_1 == our_node_id;
1895                                         let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
1896                                         secp_call!(self.secp_ctx.verify(&msghash, &msg.node_signature, if were_node_one { &announcement.node_id_2 } else { &announcement.node_id_1 }));
1897                                         secp_call!(self.secp_ctx.verify(&msghash, &msg.bitcoin_signature, if were_node_one { &announcement.bitcoin_key_2 } else { &announcement.bitcoin_key_1 }));
1898
1899                                         let our_node_sig = secp_call!(self.secp_ctx.sign(&msghash, &self.our_network_key));
1900
1901                                         (msgs::ChannelAnnouncement {
1902                                                 node_signature_1: if were_node_one { our_node_sig } else { msg.node_signature },
1903                                                 node_signature_2: if were_node_one { msg.node_signature } else { our_node_sig },
1904                                                 bitcoin_signature_1: if were_node_one { our_bitcoin_sig } else { msg.bitcoin_signature },
1905                                                 bitcoin_signature_2: if were_node_one { msg.bitcoin_signature } else { our_bitcoin_sig },
1906                                                 contents: announcement,
1907                                         }, self.get_channel_update(chan).unwrap()) // can only fail if we're not in a ready state
1908                                 },
1909                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1910                         }
1911                 };
1912                 let mut pending_events = self.pending_events.lock().unwrap();
1913                 pending_events.push(events::Event::BroadcastChannelAnnouncement { msg: chan_announcement, update_msg: chan_update });
1914                 Ok(())
1915         }
1916
1917         fn peer_disconnected(&self, their_node_id: &PublicKey, no_connection_possible: bool) {
1918                 let mut new_events = Vec::new();
1919                 let mut failed_channels = Vec::new();
1920                 {
1921                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1922                         let channel_state = channel_state_lock.borrow_parts();
1923                         let short_to_id = channel_state.short_to_id;
1924                         if no_connection_possible {
1925                                 channel_state.by_id.retain(|_, chan| {
1926                                         if chan.get_their_node_id() == *their_node_id {
1927                                                 if let Some(short_id) = chan.get_short_channel_id() {
1928                                                         short_to_id.remove(&short_id);
1929                                                 }
1930                                                 failed_channels.push(chan.force_shutdown());
1931                                                 if let Ok(update) = self.get_channel_update(&chan) {
1932                                                         new_events.push(events::Event::BroadcastChannelUpdate {
1933                                                                 msg: update
1934                                                         });
1935                                                 }
1936                                                 false
1937                                         } else {
1938                                                 true
1939                                         }
1940                                 });
1941                         } else {
1942                                 for chan in channel_state.by_id {
1943                                         if chan.1.get_their_node_id() == *their_node_id {
1944                                                 //TODO: mark channel disabled (and maybe announce such after a timeout). Also
1945                                                 //fail and wipe any uncommitted outbound HTLCs as those are considered after
1946                                                 //reconnect.
1947                                         }
1948                                 }
1949                         }
1950                 }
1951                 for failure in failed_channels.drain(..) {
1952                         self.finish_force_close_channel(failure);
1953                 }
1954                 if !new_events.is_empty() {
1955                         let mut pending_events = self.pending_events.lock().unwrap();
1956                         for event in new_events.drain(..) {
1957                                 pending_events.push(event);
1958                         }
1959                 }
1960         }
1961 }
1962
1963 #[cfg(test)]
1964 mod tests {
1965         use chain::chaininterface;
1966         use chain::transaction::OutPoint;
1967         use chain::chaininterface::ChainListener;
1968         use ln::channelmanager::{ChannelManager,OnionKeys};
1969         use ln::router::{Route, RouteHop, Router};
1970         use ln::msgs;
1971         use ln::msgs::{MsgEncodable,ChannelMessageHandler,RoutingMessageHandler};
1972         use util::test_utils;
1973         use util::events::{Event, EventsProvider};
1974
1975         use bitcoin::util::hash::Sha256dHash;
1976         use bitcoin::blockdata::block::{Block, BlockHeader};
1977         use bitcoin::blockdata::transaction::{Transaction, TxOut};
1978         use bitcoin::network::constants::Network;
1979         use bitcoin::network::serialize::serialize;
1980         use bitcoin::network::serialize::BitcoinHash;
1981
1982         use hex;
1983
1984         use secp256k1::Secp256k1;
1985         use secp256k1::key::{PublicKey,SecretKey};
1986
1987         use crypto::sha2::Sha256;
1988         use crypto::digest::Digest;
1989
1990         use rand::{thread_rng,Rng};
1991
1992         use std::collections::HashMap;
1993         use std::default::Default;
1994         use std::sync::{Arc, Mutex};
1995         use std::time::Instant;
1996         use std::mem;
1997
1998         fn build_test_onion_keys() -> Vec<OnionKeys> {
1999                 // Keys from BOLT 4, used in both test vector tests
2000                 let secp_ctx = Secp256k1::new();
2001
2002                 let route = Route {
2003                         hops: vec!(
2004                                         RouteHop {
2005                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]).unwrap(),
2006                                                 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
2007                                         },
2008                                         RouteHop {
2009                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("0324653eac434488002cc06bbfb7f10fe18991e35f9fe4302dbea6d2353dc0ab1c").unwrap()[..]).unwrap(),
2010                                                 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
2011                                         },
2012                                         RouteHop {
2013                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("027f31ebc5462c1fdce1b737ecff52d37d75dea43ce11c74d25aa297165faa2007").unwrap()[..]).unwrap(),
2014                                                 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
2015                                         },
2016                                         RouteHop {
2017                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]).unwrap(),
2018                                                 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
2019                                         },
2020                                         RouteHop {
2021                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("02edabbd16b41c8371b92ef2f04c1185b4f03b6dcd52ba9b78d9d7c89c8f221145").unwrap()[..]).unwrap(),
2022                                                 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
2023                                         },
2024                         ),
2025                 };
2026
2027                 let session_priv = SecretKey::from_slice(&secp_ctx, &hex::decode("4141414141414141414141414141414141414141414141414141414141414141").unwrap()[..]).unwrap();
2028
2029                 let onion_keys = ChannelManager::construct_onion_keys(&secp_ctx, &route, &session_priv).unwrap();
2030                 assert_eq!(onion_keys.len(), route.hops.len());
2031                 onion_keys
2032         }
2033
2034         #[test]
2035         fn onion_vectors() {
2036                 // Packet creation test vectors from BOLT 4
2037                 let onion_keys = build_test_onion_keys();
2038
2039                 assert_eq!(onion_keys[0].shared_secret[..], hex::decode("53eb63ea8a3fec3b3cd433b85cd62a4b145e1dda09391b348c4e1cd36a03ea66").unwrap()[..]);
2040                 assert_eq!(onion_keys[0].blinding_factor[..], hex::decode("2ec2e5da605776054187180343287683aa6a51b4b1c04d6dd49c45d8cffb3c36").unwrap()[..]);
2041                 assert_eq!(onion_keys[0].ephemeral_pubkey.serialize()[..], hex::decode("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]);
2042                 assert_eq!(onion_keys[0].rho, hex::decode("ce496ec94def95aadd4bec15cdb41a740c9f2b62347c4917325fcc6fb0453986").unwrap()[..]);
2043                 assert_eq!(onion_keys[0].mu, hex::decode("b57061dc6d0a2b9f261ac410c8b26d64ac5506cbba30267a649c28c179400eba").unwrap()[..]);
2044
2045                 assert_eq!(onion_keys[1].shared_secret[..], hex::decode("a6519e98832a0b179f62123b3567c106db99ee37bef036e783263602f3488fae").unwrap()[..]);
2046                 assert_eq!(onion_keys[1].blinding_factor[..], hex::decode("bf66c28bc22e598cfd574a1931a2bafbca09163df2261e6d0056b2610dab938f").unwrap()[..]);
2047                 assert_eq!(onion_keys[1].ephemeral_pubkey.serialize()[..], hex::decode("028f9438bfbf7feac2e108d677e3a82da596be706cc1cf342b75c7b7e22bf4e6e2").unwrap()[..]);
2048                 assert_eq!(onion_keys[1].rho, hex::decode("450ffcabc6449094918ebe13d4f03e433d20a3d28a768203337bc40b6e4b2c59").unwrap()[..]);
2049                 assert_eq!(onion_keys[1].mu, hex::decode("05ed2b4a3fb023c2ff5dd6ed4b9b6ea7383f5cfe9d59c11d121ec2c81ca2eea9").unwrap()[..]);
2050
2051                 assert_eq!(onion_keys[2].shared_secret[..], hex::decode("3a6b412548762f0dbccce5c7ae7bb8147d1caf9b5471c34120b30bc9c04891cc").unwrap()[..]);
2052                 assert_eq!(onion_keys[2].blinding_factor[..], hex::decode("a1f2dadd184eb1627049673f18c6325814384facdee5bfd935d9cb031a1698a5").unwrap()[..]);
2053                 assert_eq!(onion_keys[2].ephemeral_pubkey.serialize()[..], hex::decode("03bfd8225241ea71cd0843db7709f4c222f62ff2d4516fd38b39914ab6b83e0da0").unwrap()[..]);
2054                 assert_eq!(onion_keys[2].rho, hex::decode("11bf5c4f960239cb37833936aa3d02cea82c0f39fd35f566109c41f9eac8deea").unwrap()[..]);
2055                 assert_eq!(onion_keys[2].mu, hex::decode("caafe2820fa00eb2eeb78695ae452eba38f5a53ed6d53518c5c6edf76f3f5b78").unwrap()[..]);
2056
2057                 assert_eq!(onion_keys[3].shared_secret[..], hex::decode("21e13c2d7cfe7e18836df50872466117a295783ab8aab0e7ecc8c725503ad02d").unwrap()[..]);
2058                 assert_eq!(onion_keys[3].blinding_factor[..], hex::decode("7cfe0b699f35525029ae0fa437c69d0f20f7ed4e3916133f9cacbb13c82ff262").unwrap()[..]);
2059                 assert_eq!(onion_keys[3].ephemeral_pubkey.serialize()[..], hex::decode("031dde6926381289671300239ea8e57ffaf9bebd05b9a5b95beaf07af05cd43595").unwrap()[..]);
2060                 assert_eq!(onion_keys[3].rho, hex::decode("cbe784ab745c13ff5cffc2fbe3e84424aa0fd669b8ead4ee562901a4a4e89e9e").unwrap()[..]);
2061                 assert_eq!(onion_keys[3].mu, hex::decode("5052aa1b3d9f0655a0932e50d42f0c9ba0705142c25d225515c45f47c0036ee9").unwrap()[..]);
2062
2063                 assert_eq!(onion_keys[4].shared_secret[..], hex::decode("b5756b9b542727dbafc6765a49488b023a725d631af688fc031217e90770c328").unwrap()[..]);
2064                 assert_eq!(onion_keys[4].blinding_factor[..], hex::decode("c96e00dddaf57e7edcd4fb5954be5b65b09f17cb6d20651b4e90315be5779205").unwrap()[..]);
2065                 assert_eq!(onion_keys[4].ephemeral_pubkey.serialize()[..], hex::decode("03a214ebd875aab6ddfd77f22c5e7311d7f77f17a169e599f157bbcdae8bf071f4").unwrap()[..]);
2066                 assert_eq!(onion_keys[4].rho, hex::decode("034e18b8cc718e8af6339106e706c52d8df89e2b1f7e9142d996acf88df8799b").unwrap()[..]);
2067                 assert_eq!(onion_keys[4].mu, hex::decode("8e45e5c61c2b24cb6382444db6698727afb063adecd72aada233d4bf273d975a").unwrap()[..]);
2068
2069                 // Test vectors below are flat-out wrong: they claim to set outgoing_cltv_value to non-0 :/
2070                 let payloads = vec!(
2071                         msgs::OnionHopData {
2072                                 realm: 0,
2073                                 data: msgs::OnionRealm0HopData {
2074                                         short_channel_id: 0,
2075                                         amt_to_forward: 0,
2076                                         outgoing_cltv_value: 0,
2077                                 },
2078                                 hmac: [0; 32],
2079                         },
2080                         msgs::OnionHopData {
2081                                 realm: 0,
2082                                 data: msgs::OnionRealm0HopData {
2083                                         short_channel_id: 0x0101010101010101,
2084                                         amt_to_forward: 0x0100000001,
2085                                         outgoing_cltv_value: 0,
2086                                 },
2087                                 hmac: [0; 32],
2088                         },
2089                         msgs::OnionHopData {
2090                                 realm: 0,
2091                                 data: msgs::OnionRealm0HopData {
2092                                         short_channel_id: 0x0202020202020202,
2093                                         amt_to_forward: 0x0200000002,
2094                                         outgoing_cltv_value: 0,
2095                                 },
2096                                 hmac: [0; 32],
2097                         },
2098                         msgs::OnionHopData {
2099                                 realm: 0,
2100                                 data: msgs::OnionRealm0HopData {
2101                                         short_channel_id: 0x0303030303030303,
2102                                         amt_to_forward: 0x0300000003,
2103                                         outgoing_cltv_value: 0,
2104                                 },
2105                                 hmac: [0; 32],
2106                         },
2107                         msgs::OnionHopData {
2108                                 realm: 0,
2109                                 data: msgs::OnionRealm0HopData {
2110                                         short_channel_id: 0x0404040404040404,
2111                                         amt_to_forward: 0x0400000004,
2112                                         outgoing_cltv_value: 0,
2113                                 },
2114                                 hmac: [0; 32],
2115                         },
2116                 );
2117
2118                 let packet = ChannelManager::construct_onion_packet(payloads, onion_keys, &[0x42; 32]).unwrap();
2119                 // Just check the final packet encoding, as it includes all the per-hop vectors in it
2120                 // anyway...
2121                 assert_eq!(packet.encode(), hex::decode("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").unwrap());
2122         }
2123
2124         #[test]
2125         fn test_failure_packet_onion() {
2126                 // Returning Errors test vectors from BOLT 4
2127
2128                 let onion_keys = build_test_onion_keys();
2129                 let onion_error = ChannelManager::build_failure_packet(&onion_keys[4].shared_secret, 0x2002, &[0; 0]);
2130                 assert_eq!(onion_error.encode(), hex::decode("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").unwrap());
2131
2132                 let onion_packet_1 = ChannelManager::encrypt_failure_packet(&onion_keys[4].shared_secret, &onion_error.encode()[..]);
2133                 assert_eq!(onion_packet_1.data, hex::decode("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").unwrap());
2134
2135                 let onion_packet_2 = ChannelManager::encrypt_failure_packet(&onion_keys[3].shared_secret, &onion_packet_1.data[..]);
2136                 assert_eq!(onion_packet_2.data, hex::decode("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").unwrap());
2137
2138                 let onion_packet_3 = ChannelManager::encrypt_failure_packet(&onion_keys[2].shared_secret, &onion_packet_2.data[..]);
2139                 assert_eq!(onion_packet_3.data, hex::decode("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").unwrap());
2140
2141                 let onion_packet_4 = ChannelManager::encrypt_failure_packet(&onion_keys[1].shared_secret, &onion_packet_3.data[..]);
2142                 assert_eq!(onion_packet_4.data, hex::decode("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").unwrap());
2143
2144                 let onion_packet_5 = ChannelManager::encrypt_failure_packet(&onion_keys[0].shared_secret, &onion_packet_4.data[..]);
2145                 assert_eq!(onion_packet_5.data, hex::decode("9c5add3963fc7f6ed7f148623c84134b5647e1306419dbe2174e523fa9e2fbed3a06a19f899145610741c83ad40b7712aefaddec8c6baf7325d92ea4ca4d1df8bce517f7e54554608bf2bd8071a4f52a7a2f7ffbb1413edad81eeea5785aa9d990f2865dc23b4bc3c301a94eec4eabebca66be5cf638f693ec256aec514620cc28ee4a94bd9565bc4d4962b9d3641d4278fb319ed2b84de5b665f307a2db0f7fbb757366067d88c50f7e829138fde4f78d39b5b5802f1b92a8a820865af5cc79f9f30bc3f461c66af95d13e5e1f0381c184572a91dee1c849048a647a1158cf884064deddbf1b0b88dfe2f791428d0ba0f6fb2f04e14081f69165ae66d9297c118f0907705c9c4954a199bae0bb96fad763d690e7daa6cfda59ba7f2c8d11448b604d12d").unwrap());
2146         }
2147
2148         fn confirm_transaction(chain: &chaininterface::ChainWatchInterfaceUtil, tx: &Transaction, chan_id: u32) {
2149                 assert!(chain.does_match_tx(tx));
2150                 let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2151                 chain.block_connected_checked(&header, 1, &[tx; 1], &[chan_id; 1]);
2152                 for i in 2..100 {
2153                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2154                         chain.block_connected_checked(&header, i, &[tx; 0], &[0; 0]);
2155                 }
2156         }
2157
2158         struct Node {
2159                 feeest: Arc<test_utils::TestFeeEstimator>,
2160                 chain_monitor: Arc<chaininterface::ChainWatchInterfaceUtil>,
2161                 tx_broadcaster: Arc<test_utils::TestBroadcaster>,
2162                 chan_monitor: Arc<test_utils::TestChannelMonitor>,
2163                 node_id: SecretKey,
2164                 node: Arc<ChannelManager>,
2165                 router: Router,
2166         }
2167
2168         static mut CHAN_COUNT: u32 = 0;
2169         fn create_chan_between_nodes(node_a: &Node, node_b: &Node) -> (msgs::ChannelAnnouncement, msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction) {
2170                 node_a.node.create_channel(node_b.node.get_our_node_id(), 100000, 42).unwrap();
2171
2172                 let events_1 = node_a.node.get_and_clear_pending_events();
2173                 assert_eq!(events_1.len(), 1);
2174                 let accept_chan = match events_1[0] {
2175                         Event::SendOpenChannel { ref node_id, ref msg } => {
2176                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2177                                 node_b.node.handle_open_channel(&node_a.node.get_our_node_id(), msg).unwrap()
2178                         },
2179                         _ => panic!("Unexpected event"),
2180                 };
2181
2182                 node_a.node.handle_accept_channel(&node_b.node.get_our_node_id(), &accept_chan).unwrap();
2183
2184                 let chan_id = unsafe { CHAN_COUNT };
2185                 let tx;
2186                 let funding_output;
2187
2188                 let events_2 = node_a.node.get_and_clear_pending_events();
2189                 assert_eq!(events_2.len(), 1);
2190                 match events_2[0] {
2191                         Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, user_channel_id } => {
2192                                 assert_eq!(*channel_value_satoshis, 100000);
2193                                 assert_eq!(user_channel_id, 42);
2194
2195                                 tx = Transaction { version: chan_id as u32, lock_time: 0, input: Vec::new(), output: vec![TxOut {
2196                                         value: *channel_value_satoshis, script_pubkey: output_script.clone(),
2197                                 }]};
2198                                 funding_output = OutPoint::new(Sha256dHash::from_data(&serialize(&tx).unwrap()[..]), 0);
2199
2200                                 node_a.node.funding_transaction_generated(&temporary_channel_id, funding_output);
2201                                 let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
2202                                 assert_eq!(added_monitors.len(), 1);
2203                                 assert_eq!(added_monitors[0].0, funding_output);
2204                                 added_monitors.clear();
2205                         },
2206                         _ => panic!("Unexpected event"),
2207                 }
2208
2209                 let events_3 = node_a.node.get_and_clear_pending_events();
2210                 assert_eq!(events_3.len(), 1);
2211                 let funding_signed = match events_3[0] {
2212                         Event::SendFundingCreated { ref node_id, ref msg } => {
2213                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2214                                 let res = node_b.node.handle_funding_created(&node_a.node.get_our_node_id(), msg).unwrap();
2215                                 let mut added_monitors = node_b.chan_monitor.added_monitors.lock().unwrap();
2216                                 assert_eq!(added_monitors.len(), 1);
2217                                 assert_eq!(added_monitors[0].0, funding_output);
2218                                 added_monitors.clear();
2219                                 res
2220                         },
2221                         _ => panic!("Unexpected event"),
2222                 };
2223
2224                 node_a.node.handle_funding_signed(&node_b.node.get_our_node_id(), &funding_signed).unwrap();
2225                 {
2226                         let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
2227                         assert_eq!(added_monitors.len(), 1);
2228                         assert_eq!(added_monitors[0].0, funding_output);
2229                         added_monitors.clear();
2230                 }
2231
2232                 let events_4 = node_a.node.get_and_clear_pending_events();
2233                 assert_eq!(events_4.len(), 1);
2234                 match events_4[0] {
2235                         Event::FundingBroadcastSafe { ref funding_txo, user_channel_id } => {
2236                                 assert_eq!(user_channel_id, 42);
2237                                 assert_eq!(*funding_txo, funding_output);
2238                         },
2239                         _ => panic!("Unexpected event"),
2240                 };
2241
2242                 confirm_transaction(&node_a.chain_monitor, &tx, chan_id);
2243                 let events_5 = node_a.node.get_and_clear_pending_events();
2244                 assert_eq!(events_5.len(), 1);
2245                 match events_5[0] {
2246                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
2247                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2248                                 assert!(announcement_sigs.is_none());
2249                                 node_b.node.handle_funding_locked(&node_a.node.get_our_node_id(), msg).unwrap()
2250                         },
2251                         _ => panic!("Unexpected event"),
2252                 };
2253
2254                 let channel_id;
2255
2256                 confirm_transaction(&node_b.chain_monitor, &tx, chan_id);
2257                 let events_6 = node_b.node.get_and_clear_pending_events();
2258                 assert_eq!(events_6.len(), 1);
2259                 let as_announcement_sigs = match events_6[0] {
2260                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
2261                                 assert_eq!(*node_id, node_a.node.get_our_node_id());
2262                                 channel_id = msg.channel_id.clone();
2263                                 let as_announcement_sigs = node_a.node.handle_funding_locked(&node_b.node.get_our_node_id(), msg).unwrap().unwrap();
2264                                 node_a.node.handle_announcement_signatures(&node_b.node.get_our_node_id(), &(*announcement_sigs).clone().unwrap()).unwrap();
2265                                 as_announcement_sigs
2266                         },
2267                         _ => panic!("Unexpected event"),
2268                 };
2269
2270                 let events_7 = node_a.node.get_and_clear_pending_events();
2271                 assert_eq!(events_7.len(), 1);
2272                 let (announcement, as_update) = match events_7[0] {
2273                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
2274                                 (msg, update_msg)
2275                         },
2276                         _ => panic!("Unexpected event"),
2277                 };
2278
2279                 node_b.node.handle_announcement_signatures(&node_a.node.get_our_node_id(), &as_announcement_sigs).unwrap();
2280                 let events_8 = node_b.node.get_and_clear_pending_events();
2281                 assert_eq!(events_8.len(), 1);
2282                 let bs_update = match events_8[0] {
2283                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
2284                                 assert!(*announcement == *msg);
2285                                 update_msg
2286                         },
2287                         _ => panic!("Unexpected event"),
2288                 };
2289
2290                 unsafe {
2291                         CHAN_COUNT += 1;
2292                 }
2293
2294                 ((*announcement).clone(), (*as_update).clone(), (*bs_update).clone(), channel_id, tx)
2295         }
2296
2297         fn create_announced_chan_between_nodes(nodes: &Vec<Node>, a: usize, b: usize) -> (msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction) {
2298                 let chan_announcement = create_chan_between_nodes(&nodes[a], &nodes[b]);
2299                 for node in nodes {
2300                         assert!(node.router.handle_channel_announcement(&chan_announcement.0).unwrap());
2301                         node.router.handle_channel_update(&chan_announcement.1).unwrap();
2302                         node.router.handle_channel_update(&chan_announcement.2).unwrap();
2303                 }
2304                 (chan_announcement.1, chan_announcement.2, chan_announcement.3, chan_announcement.4)
2305         }
2306
2307         fn close_channel(outbound_node: &Node, inbound_node: &Node, channel_id: &[u8; 32], funding_tx: Transaction, close_inbound_first: bool) -> (msgs::ChannelUpdate, msgs::ChannelUpdate) {
2308                 let (node_a, broadcaster_a) = if close_inbound_first { (&inbound_node.node, &inbound_node.tx_broadcaster) } else { (&outbound_node.node, &outbound_node.tx_broadcaster) };
2309                 let (node_b, broadcaster_b) = if close_inbound_first { (&outbound_node.node, &outbound_node.tx_broadcaster) } else { (&inbound_node.node, &inbound_node.tx_broadcaster) };
2310                 let (tx_a, tx_b);
2311
2312                 node_a.close_channel(channel_id).unwrap();
2313                 let events_1 = node_a.get_and_clear_pending_events();
2314                 assert_eq!(events_1.len(), 1);
2315                 let shutdown_a = match events_1[0] {
2316                         Event::SendShutdown { ref node_id, ref msg } => {
2317                                 assert_eq!(node_id, &node_b.get_our_node_id());
2318                                 msg.clone()
2319                         },
2320                         _ => panic!("Unexpected event"),
2321                 };
2322
2323                 let (shutdown_b, mut closing_signed_b) = node_b.handle_shutdown(&node_a.get_our_node_id(), &shutdown_a).unwrap();
2324                 if !close_inbound_first {
2325                         assert!(closing_signed_b.is_none());
2326                 }
2327                 let (empty_a, mut closing_signed_a) = node_a.handle_shutdown(&node_b.get_our_node_id(), &shutdown_b.unwrap()).unwrap();
2328                 assert!(empty_a.is_none());
2329                 if close_inbound_first {
2330                         assert!(closing_signed_a.is_none());
2331                         closing_signed_a = node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
2332                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
2333                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
2334
2335                         let empty_b = node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
2336                         assert!(empty_b.is_none());
2337                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
2338                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
2339                 } else {
2340                         closing_signed_b = node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
2341                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
2342                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
2343
2344                         let empty_a2 = node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
2345                         assert!(empty_a2.is_none());
2346                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
2347                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
2348                 }
2349                 assert_eq!(tx_a, tx_b);
2350                 let mut funding_tx_map = HashMap::new();
2351                 funding_tx_map.insert(funding_tx.txid(), funding_tx);
2352                 tx_a.verify(&funding_tx_map).unwrap();
2353
2354                 let events_2 = node_a.get_and_clear_pending_events();
2355                 assert_eq!(events_2.len(), 1);
2356                 let as_update = match events_2[0] {
2357                         Event::BroadcastChannelUpdate { ref msg } => {
2358                                 msg.clone()
2359                         },
2360                         _ => panic!("Unexpected event"),
2361                 };
2362
2363                 let events_3 = node_b.get_and_clear_pending_events();
2364                 assert_eq!(events_3.len(), 1);
2365                 let bs_update = match events_3[0] {
2366                         Event::BroadcastChannelUpdate { ref msg } => {
2367                                 msg.clone()
2368                         },
2369                         _ => panic!("Unexpected event"),
2370                 };
2371
2372                 (as_update, bs_update)
2373         }
2374
2375         struct SendEvent {
2376                 node_id: PublicKey,
2377                 msgs: Vec<msgs::UpdateAddHTLC>,
2378                 commitment_msg: msgs::CommitmentSigned,
2379         }
2380         impl SendEvent {
2381                 fn from_event(event: Event) -> SendEvent {
2382                         match event {
2383                                 Event::SendHTLCs { node_id, msgs, commitment_msg } => {
2384                                         SendEvent { node_id: node_id, msgs: msgs, commitment_msg: commitment_msg }
2385                                 },
2386                                 _ => panic!("Unexpected event type!"),
2387                         }
2388                 }
2389         }
2390
2391         static mut PAYMENT_COUNT: u8 = 0;
2392         fn send_along_route(origin_node: &Node, route: Route, expected_route: &[&Node], recv_value: u64) -> ([u8; 32], [u8; 32]) {
2393                 let our_payment_preimage = unsafe { [PAYMENT_COUNT; 32] };
2394                 unsafe { PAYMENT_COUNT += 1 };
2395                 let our_payment_hash = {
2396                         let mut sha = Sha256::new();
2397                         sha.input(&our_payment_preimage[..]);
2398                         let mut ret = [0; 32];
2399                         sha.result(&mut ret);
2400                         ret
2401                 };
2402
2403                 let mut payment_event = {
2404                         origin_node.node.send_payment(route, our_payment_hash).unwrap();
2405                         {
2406                                 let mut added_monitors = origin_node.chan_monitor.added_monitors.lock().unwrap();
2407                                 assert_eq!(added_monitors.len(), 1);
2408                                 added_monitors.clear();
2409                         }
2410
2411                         let mut events = origin_node.node.get_and_clear_pending_events();
2412                         assert_eq!(events.len(), 1);
2413                         SendEvent::from_event(events.remove(0))
2414                 };
2415                 let mut prev_node = origin_node;
2416
2417                 for (idx, &node) in expected_route.iter().enumerate() {
2418                         assert_eq!(node.node.get_our_node_id(), payment_event.node_id);
2419
2420                         node.node.handle_update_add_htlc(&prev_node.node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
2421                         {
2422                                 let added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2423                                 assert_eq!(added_monitors.len(), 0);
2424                         }
2425
2426                         let revoke_and_ack = node.node.handle_commitment_signed(&prev_node.node.get_our_node_id(), &payment_event.commitment_msg).unwrap();
2427                         {
2428                                 let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2429                                 assert_eq!(added_monitors.len(), 1);
2430                                 added_monitors.clear();
2431                         }
2432                         assert!(prev_node.node.handle_revoke_and_ack(&node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2433                         let prev_revoke_and_ack = prev_node.node.handle_commitment_signed(&node.node.get_our_node_id(), &revoke_and_ack.1.unwrap()).unwrap();
2434                         {
2435                                 let mut added_monitors = prev_node.chan_monitor.added_monitors.lock().unwrap();
2436                                 assert_eq!(added_monitors.len(), 2);
2437                                 added_monitors.clear();
2438                         }
2439                         assert!(node.node.handle_revoke_and_ack(&prev_node.node.get_our_node_id(), &prev_revoke_and_ack.0).unwrap().is_none());
2440                         assert!(prev_revoke_and_ack.1.is_none());
2441                         {
2442                                 let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2443                                 assert_eq!(added_monitors.len(), 1);
2444                                 added_monitors.clear();
2445                         }
2446
2447                         let events_1 = node.node.get_and_clear_pending_events();
2448                         assert_eq!(events_1.len(), 1);
2449                         match events_1[0] {
2450                                 Event::PendingHTLCsForwardable { .. } => { },
2451                                 _ => panic!("Unexpected event"),
2452                         };
2453
2454                         node.node.channel_state.lock().unwrap().next_forward = Instant::now();
2455                         node.node.process_pending_htlc_forwards();
2456
2457                         let mut events_2 = node.node.get_and_clear_pending_events();
2458                         assert_eq!(events_2.len(), 1);
2459                         if idx == expected_route.len() - 1 {
2460                                 match events_2[0] {
2461                                         Event::PaymentReceived { ref payment_hash, amt } => {
2462                                                 assert_eq!(our_payment_hash, *payment_hash);
2463                                                 assert_eq!(amt, recv_value);
2464                                         },
2465                                         _ => panic!("Unexpected event"),
2466                                 }
2467                         } else {
2468                                 {
2469                                         let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2470                                         assert_eq!(added_monitors.len(), 1);
2471                                         added_monitors.clear();
2472                                 }
2473                                 payment_event = SendEvent::from_event(events_2.remove(0));
2474                                 assert_eq!(payment_event.msgs.len(), 1);
2475                         }
2476
2477                         prev_node = node;
2478                 }
2479
2480                 (our_payment_preimage, our_payment_hash)
2481         }
2482
2483         fn claim_payment(origin_node: &Node, expected_route: &[&Node], our_payment_preimage: [u8; 32]) {
2484                 assert!(expected_route.last().unwrap().node.claim_funds(our_payment_preimage));
2485                 {
2486                         let mut added_monitors = expected_route.last().unwrap().chan_monitor.added_monitors.lock().unwrap();
2487                         assert_eq!(added_monitors.len(), 1);
2488                         added_monitors.clear();
2489                 }
2490
2491                 let mut next_msgs: Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned)> = None;
2492                 macro_rules! update_fulfill_dance {
2493                         ($node: expr, $prev_node: expr, $last_node: expr) => {
2494                                 {
2495                                         $node.node.handle_update_fulfill_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
2496                                         {
2497                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2498                                                 if $last_node {
2499                                                         assert_eq!(added_monitors.len(), 1);
2500                                                 } else {
2501                                                         assert_eq!(added_monitors.len(), 2);
2502                                                         assert!(added_monitors[0].0 != added_monitors[1].0);
2503                                                 }
2504                                                 added_monitors.clear();
2505                                         }
2506                                         let revoke_and_commit = $node.node.handle_commitment_signed(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().1).unwrap();
2507                                         {
2508                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2509                                                 assert_eq!(added_monitors.len(), 1);
2510                                                 added_monitors.clear();
2511                                         }
2512                                         assert!($prev_node.node.handle_revoke_and_ack(&$node.node.get_our_node_id(), &revoke_and_commit.0).unwrap().is_none());
2513                                         let revoke_and_ack = $prev_node.node.handle_commitment_signed(&$node.node.get_our_node_id(), &revoke_and_commit.1.unwrap()).unwrap();
2514                                         assert!(revoke_and_ack.1.is_none());
2515                                         {
2516                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2517                                                 assert_eq!(added_monitors.len(), 2);
2518                                                 added_monitors.clear();
2519                                         }
2520                                         assert!($node.node.handle_revoke_and_ack(&$prev_node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2521                                         {
2522                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2523                                                 assert_eq!(added_monitors.len(), 1);
2524                                                 added_monitors.clear();
2525                                         }
2526                                 }
2527                         }
2528                 }
2529
2530                 let mut expected_next_node = expected_route.last().unwrap().node.get_our_node_id();
2531                 let mut prev_node = expected_route.last().unwrap();
2532                 for node in expected_route.iter().rev() {
2533                         assert_eq!(expected_next_node, node.node.get_our_node_id());
2534                         if next_msgs.is_some() {
2535                                 update_fulfill_dance!(node, prev_node, false);
2536                         }
2537
2538                         let events = node.node.get_and_clear_pending_events();
2539                         assert_eq!(events.len(), 1);
2540                         match events[0] {
2541                                 Event::SendFulfillHTLC { ref node_id, ref msg, ref commitment_msg } => {
2542                                         expected_next_node = node_id.clone();
2543                                         next_msgs = Some((msg.clone(), commitment_msg.clone()));
2544                                 },
2545                                 _ => panic!("Unexpected event"),
2546                         };
2547
2548                         prev_node = node;
2549                 }
2550
2551                 assert_eq!(expected_next_node, origin_node.node.get_our_node_id());
2552                 update_fulfill_dance!(origin_node, expected_route.first().unwrap(), true);
2553
2554                 let events = origin_node.node.get_and_clear_pending_events();
2555                 assert_eq!(events.len(), 1);
2556                 match events[0] {
2557                         Event::PaymentSent { payment_preimage } => {
2558                                 assert_eq!(payment_preimage, our_payment_preimage);
2559                         },
2560                         _ => panic!("Unexpected event"),
2561                 }
2562         }
2563
2564         const TEST_FINAL_CLTV: u32 = 32;
2565
2566         fn route_payment(origin_node: &Node, expected_route: &[&Node], recv_value: u64) -> ([u8; 32], [u8; 32]) {
2567                 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();
2568                 assert_eq!(route.hops.len(), expected_route.len());
2569                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
2570                         assert_eq!(hop.pubkey, node.node.get_our_node_id());
2571                 }
2572
2573                 send_along_route(origin_node, route, expected_route, recv_value)
2574         }
2575
2576         fn route_over_limit(origin_node: &Node, expected_route: &[&Node], recv_value: u64) {
2577                 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();
2578                 assert_eq!(route.hops.len(), expected_route.len());
2579                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
2580                         assert_eq!(hop.pubkey, node.node.get_our_node_id());
2581                 }
2582
2583                 let our_payment_preimage = unsafe { [PAYMENT_COUNT; 32] };
2584                 unsafe { PAYMENT_COUNT += 1 };
2585                 let our_payment_hash = {
2586                         let mut sha = Sha256::new();
2587                         sha.input(&our_payment_preimage[..]);
2588                         let mut ret = [0; 32];
2589                         sha.result(&mut ret);
2590                         ret
2591                 };
2592
2593                 let err = origin_node.node.send_payment(route, our_payment_hash).err().unwrap();
2594                 assert_eq!(err.err, "Cannot send value that would put us over our max HTLC value in flight");
2595         }
2596
2597         fn send_payment(origin: &Node, expected_route: &[&Node], recv_value: u64) {
2598                 let our_payment_preimage = route_payment(&origin, expected_route, recv_value).0;
2599                 claim_payment(&origin, expected_route, our_payment_preimage);
2600         }
2601
2602         fn fail_payment(origin_node: &Node, expected_route: &[&Node], our_payment_hash: [u8; 32]) {
2603                 assert!(expected_route.last().unwrap().node.fail_htlc_backwards(&our_payment_hash));
2604                 {
2605                         let mut added_monitors = expected_route.last().unwrap().chan_monitor.added_monitors.lock().unwrap();
2606                         assert_eq!(added_monitors.len(), 1);
2607                         added_monitors.clear();
2608                 }
2609
2610                 let mut next_msgs: Option<(msgs::UpdateFailHTLC, msgs::CommitmentSigned)> = None;
2611                 macro_rules! update_fail_dance {
2612                         ($node: expr, $prev_node: expr, $last_node: expr) => {
2613                                 {
2614                                         $node.node.handle_update_fail_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
2615                                         let revoke_and_commit = $node.node.handle_commitment_signed(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().1).unwrap();
2616
2617                                         {
2618                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2619                                                 assert_eq!(added_monitors.len(), 1);
2620                                                 added_monitors.clear();
2621                                         }
2622                                         assert!($prev_node.node.handle_revoke_and_ack(&$node.node.get_our_node_id(), &revoke_and_commit.0).unwrap().is_none());
2623                                         {
2624                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2625                                                 assert_eq!(added_monitors.len(), 1);
2626                                                 added_monitors.clear();
2627                                         }
2628                                         let revoke_and_ack = $prev_node.node.handle_commitment_signed(&$node.node.get_our_node_id(), &revoke_and_commit.1.unwrap()).unwrap();
2629                                         {
2630                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2631                                                 assert_eq!(added_monitors.len(), 1);
2632                                                 added_monitors.clear();
2633                                         }
2634                                         assert!(revoke_and_ack.1.is_none());
2635                                         assert!($node.node.get_and_clear_pending_events().is_empty());
2636                                         assert!($node.node.handle_revoke_and_ack(&$prev_node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2637                                         {
2638                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2639                                                 if $last_node {
2640                                                         assert_eq!(added_monitors.len(), 1);
2641                                                 } else {
2642                                                         assert_eq!(added_monitors.len(), 2);
2643                                                         assert!(added_monitors[0].0 != added_monitors[1].0);
2644                                                 }
2645                                                 added_monitors.clear();
2646                                         }
2647                                 }
2648                         }
2649                 }
2650
2651                 let mut expected_next_node = expected_route.last().unwrap().node.get_our_node_id();
2652                 let mut prev_node = expected_route.last().unwrap();
2653                 for node in expected_route.iter().rev() {
2654                         assert_eq!(expected_next_node, node.node.get_our_node_id());
2655                         if next_msgs.is_some() {
2656                                 update_fail_dance!(node, prev_node, false);
2657                         }
2658
2659                         let events = node.node.get_and_clear_pending_events();
2660                         assert_eq!(events.len(), 1);
2661                         match events[0] {
2662                                 Event::SendFailHTLC { ref node_id, ref msg, ref commitment_msg } => {
2663                                         expected_next_node = node_id.clone();
2664                                         next_msgs = Some((msg.clone(), commitment_msg.clone()));
2665                                 },
2666                                 _ => panic!("Unexpected event"),
2667                         };
2668
2669                         prev_node = node;
2670                 }
2671
2672                 assert_eq!(expected_next_node, origin_node.node.get_our_node_id());
2673                 update_fail_dance!(origin_node, expected_route.first().unwrap(), true);
2674
2675                 let events = origin_node.node.get_and_clear_pending_events();
2676                 assert_eq!(events.len(), 1);
2677                 match events[0] {
2678                         Event::PaymentFailed { payment_hash } => {
2679                                 assert_eq!(payment_hash, our_payment_hash);
2680                         },
2681                         _ => panic!("Unexpected event"),
2682                 }
2683         }
2684
2685         fn create_network(node_count: usize) -> Vec<Node> {
2686                 let mut nodes = Vec::new();
2687                 let mut rng = thread_rng();
2688                 let secp_ctx = Secp256k1::new();
2689
2690                 for _ in 0..node_count {
2691                         let feeest = Arc::new(test_utils::TestFeeEstimator { sat_per_kw: 253 });
2692                         let chain_monitor = Arc::new(chaininterface::ChainWatchInterfaceUtil::new());
2693                         let tx_broadcaster = Arc::new(test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new())});
2694                         let chan_monitor = Arc::new(test_utils::TestChannelMonitor::new(chain_monitor.clone(), tx_broadcaster.clone()));
2695                         let node_id = {
2696                                 let mut key_slice = [0; 32];
2697                                 rng.fill_bytes(&mut key_slice);
2698                                 SecretKey::from_slice(&secp_ctx, &key_slice).unwrap()
2699                         };
2700                         let node = ChannelManager::new(node_id.clone(), 0, true, Network::Testnet, feeest.clone(), chan_monitor.clone(), chain_monitor.clone(), tx_broadcaster.clone()).unwrap();
2701                         let router = Router::new(PublicKey::from_secret_key(&secp_ctx, &node_id).unwrap());
2702                         nodes.push(Node { feeest, chain_monitor, tx_broadcaster, chan_monitor, node_id, node, router });
2703                 }
2704
2705                 nodes
2706         }
2707
2708         #[test]
2709         fn fake_network_test() {
2710                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
2711                 // tests that payments get routed and transactions broadcast in semi-reasonable ways.
2712                 let nodes = create_network(4);
2713
2714                 // Create some initial channels
2715                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
2716                 let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2);
2717                 let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3);
2718
2719                 // Rebalance the network a bit by relaying one payment through all the channels...
2720                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2721                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2722                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2723                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2724
2725                 // Send some more payments
2726                 send_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 1000000);
2727                 send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1], &nodes[0])[..], 1000000);
2728                 send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1])[..], 1000000);
2729
2730                 // Test failure packets
2731                 let payment_hash_1 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 1000000).1;
2732                 fail_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], payment_hash_1);
2733
2734                 // Add a new channel that skips 3
2735                 let chan_4 = create_announced_chan_between_nodes(&nodes, 1, 3);
2736
2737                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 1000000);
2738                 send_payment(&nodes[2], &vec!(&nodes[3])[..], 1000000);
2739                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2740                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2741                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2742                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2743                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2744
2745                 // Do some rebalance loop payments, simultaneously
2746                 let mut hops = Vec::with_capacity(3);
2747                 hops.push(RouteHop {
2748                         pubkey: nodes[2].node.get_our_node_id(),
2749                         short_channel_id: chan_2.0.contents.short_channel_id,
2750                         fee_msat: 0,
2751                         cltv_expiry_delta: chan_3.0.contents.cltv_expiry_delta as u32
2752                 });
2753                 hops.push(RouteHop {
2754                         pubkey: nodes[3].node.get_our_node_id(),
2755                         short_channel_id: chan_3.0.contents.short_channel_id,
2756                         fee_msat: 0,
2757                         cltv_expiry_delta: chan_4.1.contents.cltv_expiry_delta as u32
2758                 });
2759                 hops.push(RouteHop {
2760                         pubkey: nodes[1].node.get_our_node_id(),
2761                         short_channel_id: chan_4.0.contents.short_channel_id,
2762                         fee_msat: 1000000,
2763                         cltv_expiry_delta: TEST_FINAL_CLTV,
2764                 });
2765                 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;
2766                 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;
2767                 let payment_preimage_1 = send_along_route(&nodes[1], Route { hops }, &vec!(&nodes[2], &nodes[3], &nodes[1])[..], 1000000).0;
2768
2769                 let mut hops = Vec::with_capacity(3);
2770                 hops.push(RouteHop {
2771                         pubkey: nodes[3].node.get_our_node_id(),
2772                         short_channel_id: chan_4.0.contents.short_channel_id,
2773                         fee_msat: 0,
2774                         cltv_expiry_delta: chan_3.1.contents.cltv_expiry_delta as u32
2775                 });
2776                 hops.push(RouteHop {
2777                         pubkey: nodes[2].node.get_our_node_id(),
2778                         short_channel_id: chan_3.0.contents.short_channel_id,
2779                         fee_msat: 0,
2780                         cltv_expiry_delta: chan_2.1.contents.cltv_expiry_delta as u32
2781                 });
2782                 hops.push(RouteHop {
2783                         pubkey: nodes[1].node.get_our_node_id(),
2784                         short_channel_id: chan_2.0.contents.short_channel_id,
2785                         fee_msat: 1000000,
2786                         cltv_expiry_delta: TEST_FINAL_CLTV,
2787                 });
2788                 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;
2789                 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;
2790                 let payment_hash_2 = send_along_route(&nodes[1], Route { hops }, &vec!(&nodes[3], &nodes[2], &nodes[1])[..], 1000000).1;
2791
2792                 // Claim the rebalances...
2793                 fail_payment(&nodes[1], &vec!(&nodes[3], &nodes[2], &nodes[1])[..], payment_hash_2);
2794                 claim_payment(&nodes[1], &vec!(&nodes[2], &nodes[3], &nodes[1])[..], payment_preimage_1);
2795
2796                 // Add a duplicate new channel from 2 to 4
2797                 let chan_5 = create_announced_chan_between_nodes(&nodes, 1, 3);
2798
2799                 // Send some payments across both channels
2800                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2801                 let payment_preimage_4 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2802                 let payment_preimage_5 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2803
2804                 route_over_limit(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000);
2805
2806                 //TODO: Test that routes work again here as we've been notified that the channel is full
2807
2808                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_3);
2809                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_4);
2810                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_5);
2811
2812                 // Close down the channels...
2813                 close_channel(&nodes[0], &nodes[1], &chan_1.2, chan_1.3, true);
2814                 close_channel(&nodes[1], &nodes[2], &chan_2.2, chan_2.3, false);
2815                 close_channel(&nodes[2], &nodes[3], &chan_3.2, chan_3.3, true);
2816                 close_channel(&nodes[1], &nodes[3], &chan_4.2, chan_4.3, false);
2817                 close_channel(&nodes[1], &nodes[3], &chan_5.2, chan_5.3, false);
2818
2819                 // Check that we processed all pending events
2820                 for node in nodes {
2821                         assert_eq!(node.node.get_and_clear_pending_events().len(), 0);
2822                         assert_eq!(node.chan_monitor.added_monitors.lock().unwrap().len(), 0);
2823                 }
2824         }
2825
2826         #[derive(PartialEq)]
2827         enum HTLCType { NONE, TIMEOUT, SUCCESS }
2828         fn test_txn_broadcast(node: &Node, chan: &(msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction), commitment_tx: Option<Transaction>, has_htlc_tx: HTLCType) -> Vec<Transaction> {
2829                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
2830                 assert!(node_txn.len() >= if commitment_tx.is_some() { 0 } else { 1 } + if has_htlc_tx == HTLCType::NONE { 0 } else { 1 });
2831
2832                 let mut res = Vec::with_capacity(2);
2833
2834                 if let Some(explicit_tx) = commitment_tx {
2835                         res.push(explicit_tx.clone());
2836                 } else {
2837                         for tx in node_txn.iter() {
2838                                 if tx.input.len() == 1 && tx.input[0].prev_hash == chan.3.txid() {
2839                                         let mut funding_tx_map = HashMap::new();
2840                                         funding_tx_map.insert(chan.3.txid(), chan.3.clone());
2841                                         tx.verify(&funding_tx_map).unwrap();
2842                                         res.push(tx.clone());
2843                                 }
2844                         }
2845                 }
2846                 assert_eq!(res.len(), 1);
2847
2848                 if has_htlc_tx != HTLCType::NONE {
2849                         for tx in node_txn.iter() {
2850                                 if tx.input.len() == 1 && tx.input[0].prev_hash == res[0].txid() {
2851                                         let mut funding_tx_map = HashMap::new();
2852                                         funding_tx_map.insert(res[0].txid(), res[0].clone());
2853                                         tx.verify(&funding_tx_map).unwrap();
2854                                         if has_htlc_tx == HTLCType::TIMEOUT {
2855                                                 assert!(tx.lock_time != 0);
2856                                         } else {
2857                                                 assert!(tx.lock_time == 0);
2858                                         }
2859                                         res.push(tx.clone());
2860                                         break;
2861                                 }
2862                         }
2863                         assert_eq!(res.len(), 2);
2864                 }
2865                 node_txn.clear();
2866                 res
2867         }
2868
2869         fn check_preimage_claim(node: &Node, prev_txn: &Vec<Transaction>) -> Vec<Transaction> {
2870                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
2871
2872                 assert!(node_txn.len() >= 1);
2873                 assert_eq!(node_txn[0].input.len(), 1);
2874                 let mut found_prev = false;
2875
2876                 for tx in prev_txn {
2877                         if node_txn[0].input[0].prev_hash == tx.txid() {
2878                                 let mut funding_tx_map = HashMap::new();
2879                                 funding_tx_map.insert(tx.txid(), tx.clone());
2880                                 node_txn[0].verify(&funding_tx_map).unwrap();
2881
2882                                 assert!(node_txn[0].input[0].witness[2].len() > 106); // must spend an htlc output
2883                                 assert_eq!(tx.input.len(), 1); // must spend a commitment tx
2884
2885                                 found_prev = true;
2886                                 break;
2887                         }
2888                 }
2889                 assert!(found_prev);
2890
2891                 let mut res = Vec::new();
2892                 mem::swap(&mut *node_txn, &mut res);
2893                 res
2894         }
2895
2896         fn get_announce_close_broadcast_events(nodes: &Vec<Node>, a: usize, b: usize) {
2897                 let events_1 = nodes[a].node.get_and_clear_pending_events();
2898                 assert_eq!(events_1.len(), 1);
2899                 let as_update = match events_1[0] {
2900                         Event::BroadcastChannelUpdate { ref msg } => {
2901                                 msg.clone()
2902                         },
2903                         _ => panic!("Unexpected event"),
2904                 };
2905
2906                 let events_2 = nodes[b].node.get_and_clear_pending_events();
2907                 assert_eq!(events_2.len(), 1);
2908                 let bs_update = match events_2[0] {
2909                         Event::BroadcastChannelUpdate { ref msg } => {
2910                                 msg.clone()
2911                         },
2912                         _ => panic!("Unexpected event"),
2913                 };
2914
2915                 for node in nodes {
2916                         node.router.handle_channel_update(&as_update).unwrap();
2917                         node.router.handle_channel_update(&bs_update).unwrap();
2918                 }
2919         }
2920
2921         #[test]
2922         fn channel_monitor_network_test() {
2923                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
2924                 // tests that ChannelMonitor is able to recover from various states.
2925                 let nodes = create_network(5);
2926
2927                 // Create some initial channels
2928                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
2929                 let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2);
2930                 let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3);
2931                 let chan_4 = create_announced_chan_between_nodes(&nodes, 3, 4);
2932
2933                 // Rebalance the network a bit by relaying one payment through all the channels...
2934                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2935                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2936                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2937                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2938
2939                 // Simple case with no pending HTLCs:
2940                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), true);
2941                 {
2942                         let mut node_txn = test_txn_broadcast(&nodes[1], &chan_1, None, HTLCType::NONE);
2943                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2944                         nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn.drain(..).next().unwrap()] }, 1);
2945                         test_txn_broadcast(&nodes[0], &chan_1, None, HTLCType::NONE);
2946                 }
2947                 get_announce_close_broadcast_events(&nodes, 0, 1);
2948                 assert_eq!(nodes[0].node.list_channels().len(), 0);
2949                 assert_eq!(nodes[1].node.list_channels().len(), 1);
2950
2951                 // One pending HTLC is discarded by the force-close:
2952                 let payment_preimage_1 = route_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 3000000).0;
2953
2954                 // Simple case of one pending HTLC to HTLC-Timeout
2955                 nodes[1].node.peer_disconnected(&nodes[2].node.get_our_node_id(), true);
2956                 {
2957                         let mut node_txn = test_txn_broadcast(&nodes[1], &chan_2, None, HTLCType::TIMEOUT);
2958                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2959                         nodes[2].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn.drain(..).next().unwrap()] }, 1);
2960                         test_txn_broadcast(&nodes[2], &chan_2, None, HTLCType::NONE);
2961                 }
2962                 get_announce_close_broadcast_events(&nodes, 1, 2);
2963                 assert_eq!(nodes[1].node.list_channels().len(), 0);
2964                 assert_eq!(nodes[2].node.list_channels().len(), 1);
2965
2966                 macro_rules! claim_funds {
2967                         ($node: expr, $prev_node: expr, $preimage: expr) => {
2968                                 {
2969                                         assert!($node.node.claim_funds($preimage));
2970                                         {
2971                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2972                                                 assert_eq!(added_monitors.len(), 1);
2973                                                 added_monitors.clear();
2974                                         }
2975
2976                                         let events = $node.node.get_and_clear_pending_events();
2977                                         assert_eq!(events.len(), 1);
2978                                         match events[0] {
2979                                                 Event::SendFulfillHTLC { ref node_id, .. } => {
2980                                                         assert_eq!(*node_id, $prev_node.node.get_our_node_id());
2981                                                 },
2982                                                 _ => panic!("Unexpected event"),
2983                                         };
2984                                 }
2985                         }
2986                 }
2987
2988                 // nodes[3] gets the preimage, but nodes[2] already disconnected, resulting in a nodes[2]
2989                 // HTLC-Timeout and a nodes[3] claim against it (+ its own announces)
2990                 nodes[2].node.peer_disconnected(&nodes[3].node.get_our_node_id(), true);
2991                 {
2992                         let node_txn = test_txn_broadcast(&nodes[2], &chan_3, None, HTLCType::TIMEOUT);
2993
2994                         // Claim the payment on nodes[3], giving it knowledge of the preimage
2995                         claim_funds!(nodes[3], nodes[2], payment_preimage_1);
2996
2997                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2998                         nodes[3].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[0].clone()] }, 1);
2999
3000                         check_preimage_claim(&nodes[3], &node_txn);
3001                 }
3002                 get_announce_close_broadcast_events(&nodes, 2, 3);
3003                 assert_eq!(nodes[2].node.list_channels().len(), 0);
3004                 assert_eq!(nodes[3].node.list_channels().len(), 1);
3005
3006                 // One pending HTLC to time out:
3007                 let payment_preimage_2 = route_payment(&nodes[3], &vec!(&nodes[4])[..], 3000000).0;
3008
3009                 {
3010                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3011                         nodes[3].chain_monitor.block_connected_checked(&header, 1, &Vec::new()[..], &[0; 0]);
3012                         for i in 2..TEST_FINAL_CLTV - 3 {
3013                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3014                                 nodes[3].chain_monitor.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
3015                         }
3016
3017                         let node_txn = test_txn_broadcast(&nodes[3], &chan_4, None, HTLCType::TIMEOUT);
3018
3019                         // Claim the payment on nodes[3], giving it knowledge of the preimage
3020                         claim_funds!(nodes[4], nodes[3], payment_preimage_2);
3021
3022                         header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3023                         nodes[4].chain_monitor.block_connected_checked(&header, 1, &Vec::new()[..], &[0; 0]);
3024                         for i in 2..TEST_FINAL_CLTV - 3 {
3025                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3026                                 nodes[4].chain_monitor.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
3027                         }
3028
3029                         test_txn_broadcast(&nodes[4], &chan_4, None, HTLCType::SUCCESS);
3030
3031                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3032                         nodes[4].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[0].clone()] }, TEST_FINAL_CLTV - 5);
3033
3034                         check_preimage_claim(&nodes[4], &node_txn);
3035                 }
3036                 get_announce_close_broadcast_events(&nodes, 3, 4);
3037                 assert_eq!(nodes[3].node.list_channels().len(), 0);
3038                 assert_eq!(nodes[4].node.list_channels().len(), 0);
3039
3040                 // Create some new channels:
3041                 let chan_5 = create_announced_chan_between_nodes(&nodes, 0, 1);
3042
3043                 // A pending HTLC which will be revoked:
3044                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
3045                 // Get the will-be-revoked local txn from nodes[0]
3046                 let revoked_local_txn = nodes[0].node.channel_state.lock().unwrap().by_id.iter().next().unwrap().1.last_local_commitment_txn.clone();
3047                 // Revoke the old state
3048                 claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage_3);
3049
3050                 {
3051                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3052                         nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
3053                         {
3054                                 let mut node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
3055                                 assert_eq!(node_txn.len(), 2);
3056                                 assert_eq!(node_txn[0].input.len(), 1);
3057
3058                                 let mut funding_tx_map = HashMap::new();
3059                                 funding_tx_map.insert(revoked_local_txn[0].txid(), revoked_local_txn[0].clone());
3060                                 node_txn[0].verify(&funding_tx_map).unwrap();
3061                                 node_txn.swap_remove(0);
3062                         }
3063                         test_txn_broadcast(&nodes[1], &chan_5, None, HTLCType::NONE);
3064
3065                         nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
3066                         let node_txn = test_txn_broadcast(&nodes[0], &chan_5, Some(revoked_local_txn[0].clone()), HTLCType::TIMEOUT);
3067                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3068                         nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[1].clone()] }, 1);
3069
3070                         //TODO: At this point nodes[1] should claim the revoked HTLC-Timeout output, but that's
3071                         //not yet implemented in ChannelMonitor
3072                 }
3073                 get_announce_close_broadcast_events(&nodes, 0, 1);
3074                 assert_eq!(nodes[0].node.list_channels().len(), 0);
3075                 assert_eq!(nodes[1].node.list_channels().len(), 0);
3076
3077                 // Check that we processed all pending events
3078                 for node in nodes {
3079                         assert_eq!(node.node.get_and_clear_pending_events().len(), 0);
3080                         assert_eq!(node.chan_monitor.added_monitors.lock().unwrap().len(), 0);
3081                 }
3082         }
3083
3084         #[test]
3085         fn test_unconf_chan() {
3086                 // After creating a chan between nodes, we disconnect all blocks previously seen to force a channel close on nodes[0] side
3087                 let nodes = create_network(2);
3088                 create_announced_chan_between_nodes(&nodes, 0, 1);
3089
3090                 let channel_state = nodes[0].node.channel_state.lock().unwrap();
3091                 assert_eq!(channel_state.by_id.len(), 1);
3092                 assert_eq!(channel_state.short_to_id.len(), 1);
3093                 mem::drop(channel_state);
3094
3095                 let mut headers = Vec::new();
3096                 let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3097                 headers.push(header.clone());
3098                 for _i in 2..100 {
3099                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3100                         headers.push(header.clone());
3101                 }
3102                 while !headers.is_empty() {
3103                         nodes[0].node.block_disconnected(&headers.pop().unwrap());
3104                 }
3105                 let channel_state = nodes[0].node.channel_state.lock().unwrap();
3106                 assert_eq!(channel_state.by_id.len(), 0);
3107                 assert_eq!(channel_state.short_to_id.len(), 0);
3108         }
3109 }