_ 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 use bitcoin::util::uint::Uint256;
   8
   9 use secp256k1::key::{SecretKey,PublicKey};
  10 use secp256k1::{Secp256k1,Message};
  11 use secp256k1::ecdh::SharedSecret;
  12 use secp256k1;
  13
  14 use chain::chaininterface::{BroadcasterInterface,ChainListener,ChainWatchInterface,FeeEstimator};
  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::sync::{Mutex,MutexGuard,Arc};
  31 use std::collections::HashMap;
  32 use std::collections::hash_map;
  33 use std::{ptr, mem};
  34 use std::time::{Instant,Duration};
  35
  36 mod channel_held_info {
  37         use ln::msgs;
  38
  39         /// Stores the info we will need to send when we want to forward an HTLC onwards
  40         pub struct PendingForwardHTLCInfo {
  41                 pub(super) onion_packet: Option<msgs::OnionPacket>,
  42                 pub(super) payment_hash: [u8; 32],
  43                 pub(super) short_channel_id: u64,
  44                 pub(super) prev_short_channel_id: u64,
  45                 pub(super) amt_to_forward: u64,
  46                 pub(super) outgoing_cltv_value: u32,
  47         }
  48
  49         #[cfg(feature = "fuzztarget")]
  50         impl PendingForwardHTLCInfo {
  51                 pub fn dummy() -> Self {
  52                         Self {
  53                                 onion_packet: None,
  54                                 payment_hash: [0; 32],
  55                                 short_channel_id: 0,
  56                                 prev_short_channel_id: 0,
  57                                 amt_to_forward: 0,
  58                                 outgoing_cltv_value: 0,
  59                         }
  60                 }
  61         }
  62
  63         #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
  64         pub enum HTLCFailReason {
  65                 ErrorPacket {
  66                         err: msgs::OnionErrorPacket,
  67                 },
  68                 Reason {
  69                         failure_code: u16,
  70                         data: Vec<u8>,
  71                 }
  72         }
  73
  74         #[cfg(feature = "fuzztarget")]
  75         impl HTLCFailReason {
  76                 pub fn dummy() -> Self {
  77                         HTLCFailReason::Reason {
  78                                 failure_code: 0, data: Vec::new(),
  79                         }
  80                 }
  81         }
  82 }
  83 #[cfg(feature = "fuzztarget")]
  84 pub use self::channel_held_info::*;
  85 #[cfg(not(feature = "fuzztarget"))]
  86 pub(crate) use self::channel_held_info::*;
  87
  88 enum PendingOutboundHTLC {
  89         IntermediaryHopData {
  90                 source_short_channel_id: u64,
  91                 incoming_packet_shared_secret: SharedSecret,
  92         },
  93         OutboundRoute {
  94                 route: Route,
  95                 session_priv: SecretKey,
  96         },
  97         /// Used for channel rebalancing
  98         CycledRoute {
  99                 source_short_channel_id: u64,
 100                 incoming_packet_shared_secret: SharedSecret,
 101                 route: Route,
 102                 session_priv: SecretKey,
 103         }
 104 }
 105
 106 /// We hold back HTLCs we intend to relay for a random interval in the range (this, 5*this). This
 107 /// provides some limited amount of privacy. Ideally this would range from somewhere like 1 second
 108 /// to 30 seconds, but people expect lightning to be, you know, kinda fast, sadly. We could
 109 /// probably increase this significantly.
 110 const MIN_HTLC_RELAY_HOLDING_CELL_MILLIS: u32 = 50;
 111
 112 struct ChannelHolder {
 113         by_id: HashMap<Uint256, Channel>,
 114         short_to_id: HashMap<u64, Uint256>,
 115         next_forward: Instant,
 116         /// short channel id -> forward infos. Key of 0 means payments received
 117         forward_htlcs: HashMap<u64, Vec<PendingForwardHTLCInfo>>,
 118         claimable_htlcs: HashMap<[u8; 32], PendingOutboundHTLC>,
 119 }
 120 struct MutChannelHolder<'a> {
 121         by_id: &'a mut HashMap<Uint256, Channel>,
 122         short_to_id: &'a mut HashMap<u64, Uint256>,
 123         next_forward: &'a mut Instant,
 124         /// short channel id -> forward infos. Key of 0 means payments received
 125         forward_htlcs: &'a mut HashMap<u64, Vec<PendingForwardHTLCInfo>>,
 126         claimable_htlcs: &'a mut HashMap<[u8; 32], PendingOutboundHTLC>,
 127 }
 128 impl ChannelHolder {
 129         fn borrow_parts(&mut self) -> MutChannelHolder {
 130                 MutChannelHolder {
 131                         by_id: &mut self.by_id,
 132                         short_to_id: &mut self.short_to_id,
 133                         next_forward: &mut self.next_forward,
 134                         /// short channel id -> forward infos. Key of 0 means payments received
 135                         forward_htlcs: &mut self.forward_htlcs,
 136                         claimable_htlcs: &mut self.claimable_htlcs,
 137                 }
 138         }
 139 }
 140
 141 /// Manager which keeps track of a number of channels and sends messages to the appropriate
 142 /// channel, also tracking HTLC preimages and forwarding onion packets appropriately.
 143 /// Implements ChannelMessageHandler, handling the multi-channel parts and passing things through
 144 /// to individual Channels.
 145 pub struct ChannelManager {
 146         genesis_hash: Sha256dHash,
 147         fee_estimator: Arc<FeeEstimator>,
 148         monitor: Arc<ManyChannelMonitor>,
 149         chain_monitor: Arc<ChainWatchInterface>,
 150         tx_broadcaster: Arc<BroadcasterInterface>,
 151
 152         announce_channels_publicly: bool,
 153         fee_proportional_millionths: u32,
 154         secp_ctx: Secp256k1,
 155
 156         channel_state: Mutex<ChannelHolder>,
 157         our_network_key: SecretKey,
 158
 159         pending_events: Mutex<Vec<events::Event>>,
 160 }
 161
 162 const CLTV_EXPIRY_DELTA: u16 = 6 * 24 * 2; //TODO?
 163
 164 macro_rules! secp_call {
 165         ( $res : expr ) => {
 166                 match $res {
 167                         Ok(key) => key,
 168                         //TODO: Make the err a parameter!
 169                         Err(_) => return Err(HandleError{err: "Key error", msg: None})
 170                 }
 171         };
 172 }
 173
 174 struct OnionKeys {
 175         #[cfg(test)]
 176         shared_secret: SharedSecret,
 177         #[cfg(test)]
 178         blinding_factor: [u8; 32],
 179         ephemeral_pubkey: PublicKey,
 180         rho: [u8; 32],
 181         mu: [u8; 32],
 182 }
 183
 184 pub struct ChannelDetails {
 185         /// The channel's ID (prior to funding transaction generation, this is a random 32 bytes,
 186         /// thereafter this is the txid of the funding transaction xor the funding transaction output).
 187         /// Note that this means this value is *not* persistent - it can change once during the
 188         /// lifetime of the channel.
 189         pub channel_id: Uint256,
 190         /// The position of the funding transaction in the chain. None if the funding transaction has
 191         /// not yet been confirmed and the channel fully opened.
 192         pub short_channel_id: Option<u64>,
 193         pub remote_network_id: PublicKey,
 194         pub channel_value_satoshis: u64,
 195         /// The user_id passed in to create_channel, or 0 if the channel was inbound.
 196         pub user_id: u64,
 197 }
 198
 199 impl ChannelManager {
 200         /// Constructs a new ChannelManager to hold several channels and route between them. This is
 201         /// the main "logic hub" for all channel-related actions, and implements ChannelMessageHandler.
 202         /// fee_proportional_millionths is an optional fee to charge any payments routed through us.
 203         /// Non-proportional fees are fixed according to our risk using the provided fee estimator.
 204         /// panics if channel_value_satoshis is >= (1 << 24)!
 205         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> {
 206                 let secp_ctx = Secp256k1::new();
 207
 208                 let res = Arc::new(ChannelManager {
 209                         genesis_hash: genesis_block(network).header.bitcoin_hash(),
 210                         fee_estimator: feeest.clone(),
 211                         monitor: monitor.clone(),
 212                         chain_monitor,
 213                         tx_broadcaster,
 214
 215                         announce_channels_publicly,
 216                         fee_proportional_millionths,
 217                         secp_ctx,
 218
 219                         channel_state: Mutex::new(ChannelHolder{
 220                                 by_id: HashMap::new(),
 221                                 short_to_id: HashMap::new(),
 222                                 next_forward: Instant::now(),
 223                                 forward_htlcs: HashMap::new(),
 224                                 claimable_htlcs: HashMap::new(),
 225                         }),
 226                         our_network_key,
 227
 228                         pending_events: Mutex::new(Vec::new()),
 229                 });
 230                 let weak_res = Arc::downgrade(&res);
 231                 res.chain_monitor.register_listener(weak_res);
 232                 Ok(res)
 233         }
 234
 235         pub fn create_channel(&self, their_network_key: PublicKey, channel_value_satoshis: u64, user_id: u64) -> Result<msgs::OpenChannel, HandleError> {
 236                 let chan_keys = if cfg!(feature = "fuzztarget") {
 237                         ChannelKeys {
 238                                 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(),
 239                                 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(),
 240                                 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(),
 241                                 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(),
 242                                 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(),
 243                                 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(),
 244                                 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(),
 245                                 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],
 246                         }
 247                 } else {
 248                         let mut key_seed = [0u8; 32];
 249                         rng::fill_bytes(&mut key_seed);
 250                         match ChannelKeys::new_from_seed(&key_seed) {
 251                                 Ok(key) => key,
 252                                 Err(_) => panic!("RNG is busted!")
 253                         }
 254                 };
 255
 256                 let channel = Channel::new_outbound(&*self.fee_estimator, chan_keys, their_network_key, channel_value_satoshis, self.announce_channels_publicly, user_id);
 257                 let res = channel.get_open_channel(self.genesis_hash.clone(), &*self.fee_estimator)?;
 258                 let mut channel_state = self.channel_state.lock().unwrap();
 259                 match channel_state.by_id.insert(channel.channel_id(), channel) {
 260                         Some(_) => panic!("RNG is bad???"),
 261                         None => Ok(res)
 262                 }
 263         }
 264
 265         /// Gets the list of open channels, in random order. See ChannelDetail field documentation for
 266         /// more information.
 267         pub fn list_channels(&self) -> Vec<ChannelDetails> {
 268                 let channel_state = self.channel_state.lock().unwrap();
 269                 let mut res = Vec::with_capacity(channel_state.by_id.len());
 270                 for (channel_id, channel) in channel_state.by_id.iter() {
 271                         res.push(ChannelDetails {
 272                                 channel_id: (*channel_id).clone(),
 273                                 short_channel_id: channel.get_short_channel_id(),
 274                                 remote_network_id: channel.get_their_node_id(),
 275                                 channel_value_satoshis: channel.get_value_satoshis(),
 276                                 user_id: channel.get_user_id(),
 277                         });
 278                 }
 279                 res
 280         }
 281
 282         /// Begins the process of closing a channel. After this call (plus some timeout), no new HTLCs
 283         /// will be accepted on the given channel, and after additional timeout/the closing of all
 284         /// pending HTLCs, the channel will be closed on chain.
 285         pub fn close_channel(&self, channel_id: &Uint256) -> Result<msgs::Shutdown, HandleError> {
 286                 let res = {
 287                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 288                         let channel_state = channel_state_lock.borrow_parts();
 289
 290                         match channel_state.by_id.entry(channel_id.clone()) {
 291                                 hash_map::Entry::Occupied(mut chan_entry) => {
 292                                         let res = chan_entry.get_mut().get_shutdown()?;
 293                                         if chan_entry.get().is_shutdown() {
 294                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
 295                                                         channel_state.short_to_id.remove(&short_id);
 296                                                 }
 297                                                 chan_entry.remove_entry();
 298                                         }
 299                                         res
 300                                 },
 301                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "No such channel", msg: None})
 302                         }
 303                 };
 304                 for payment_hash in res.1 {
 305                         // unknown_next_peer...I dunno who that is anymore....
 306                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
 307                 }
 308                 Ok(res.0)
 309         }
 310
 311         #[inline]
 312         fn gen_rho_mu_from_shared_secret(shared_secret: &SharedSecret) -> ([u8; 32], [u8; 32]) {
 313                 ({
 314                         let mut hmac = Hmac::new(Sha256::new(), &[0x72, 0x68, 0x6f]); // rho
 315                         hmac.input(&shared_secret[..]);
 316                         let mut res = [0; 32];
 317                         hmac.raw_result(&mut res);
 318                         res
 319                 },
 320                 {
 321                         let mut hmac = Hmac::new(Sha256::new(), &[0x6d, 0x75]); // mu
 322                         hmac.input(&shared_secret[..]);
 323                         let mut res = [0; 32];
 324                         hmac.raw_result(&mut res);
 325                         res
 326                 })
 327         }
 328
 329         #[inline]
 330         fn gen_um_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 331                 let mut hmac = Hmac::new(Sha256::new(), &[0x75, 0x6d]); // um
 332                 hmac.input(&shared_secret[..]);
 333                 let mut res = [0; 32];
 334                 hmac.raw_result(&mut res);
 335                 res
 336         }
 337
 338         #[inline]
 339         fn gen_ammag_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 340                 let mut hmac = Hmac::new(Sha256::new(), &[0x61, 0x6d, 0x6d, 0x61, 0x67]); // ammag
 341                 hmac.input(&shared_secret[..]);
 342                 let mut res = [0; 32];
 343                 hmac.raw_result(&mut res);
 344                 res
 345         }
 346
 347         // can only fail if an intermediary hop has an invalid public key or session_priv is invalid
 348         #[inline]
 349         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> {
 350                 let mut blinded_priv = session_priv.clone();
 351                 let mut blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 352                 let mut first_iteration = true;
 353
 354                 for hop in route.hops.iter() {
 355                         let shared_secret = SharedSecret::new(secp_ctx, &hop.pubkey, &blinded_priv);
 356
 357                         let mut sha = Sha256::new();
 358                         sha.input(&blinded_pub.serialize()[..]);
 359                         sha.input(&shared_secret[..]);
 360                         let mut blinding_factor = [0u8; 32];
 361                         sha.result(&mut blinding_factor);
 362
 363                         if first_iteration {
 364                                 blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 365                                 first_iteration = false;
 366                         }
 367                         let ephemeral_pubkey = blinded_pub;
 368
 369                         secp_call!(blinded_priv.mul_assign(secp_ctx, &secp_call!(SecretKey::from_slice(secp_ctx, &blinding_factor))));
 370                         blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 371
 372                         callback(shared_secret, blinding_factor, ephemeral_pubkey, hop);
 373                 }
 374
 375                 Ok(())
 376         }
 377
 378         // can only fail if an intermediary hop has an invalid public key or session_priv is invalid
 379         fn construct_onion_keys(secp_ctx: &Secp256k1, route: &Route, session_priv: &SecretKey) -> Result<Vec<OnionKeys>, HandleError> {
 380                 let mut res = Vec::with_capacity(route.hops.len());
 381
 382                 Self::construct_onion_keys_callback(secp_ctx, route, session_priv, |shared_secret, _blinding_factor, ephemeral_pubkey, _| {
 383                         let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
 384
 385                         res.push(OnionKeys {
 386                                 #[cfg(test)]
 387                                 shared_secret,
 388                                 #[cfg(test)]
 389                                 blinding_factor: _blinding_factor,
 390                                 ephemeral_pubkey,
 391                                 rho,
 392                                 mu,
 393                         });
 394                 })?;
 395
 396                 Ok(res)
 397         }
 398
 399         /// returns the hop data, as well as the first-hop value_msat and CLTV value we should send.
 400         fn build_onion_payloads(route: &Route) -> Result<(Vec<msgs::OnionHopData>, u64, u32), HandleError> {
 401                 let mut cur_value_msat = 0u64;
 402                 let mut cur_cltv = 0u32;
 403                 let mut last_short_channel_id = 0;
 404                 let mut res: Vec<msgs::OnionHopData> = Vec::with_capacity(route.hops.len());
 405                 internal_traits::test_no_dealloc::<msgs::OnionHopData>(None);
 406                 unsafe { res.set_len(route.hops.len()); }
 407
 408                 for (idx, hop) in route.hops.iter().enumerate().rev() {
 409                         // First hop gets special values so that it can check, on receipt, that everything is
 410                         // exactly as it should be (and the next hop isn't trying to probe to find out if we're
 411                         // the intended recipient).
 412                         let value_msat = if cur_value_msat == 0 { hop.fee_msat } else { cur_value_msat };
 413                         let cltv = if cur_cltv == 0 { hop.cltv_expiry_delta } else { cur_cltv };
 414                         res[idx] = msgs::OnionHopData {
 415                                 realm: 0,
 416                                 data: msgs::OnionRealm0HopData {
 417                                         short_channel_id: last_short_channel_id,
 418                                         amt_to_forward: value_msat,
 419                                         outgoing_cltv_value: cltv,
 420                                 },
 421                                 hmac: [0; 32],
 422                         };
 423                         cur_value_msat += hop.fee_msat;
 424                         if cur_value_msat >= 21000000 * 100000000 * 1000 {
 425                                 return Err(HandleError{err: "Channel fees overflowed?!", msg: None});
 426                         }
 427                         cur_cltv += hop.cltv_expiry_delta as u32;
 428                         if cur_cltv >= 500000000 {
 429                                 return Err(HandleError{err: "Channel CLTV overflowed?!", msg: None});
 430                         }
 431                         last_short_channel_id = hop.short_channel_id;
 432                 }
 433                 Ok((res, cur_value_msat, cur_cltv))
 434         }
 435
 436         #[inline]
 437         fn shift_arr_right(arr: &mut [u8; 20*65]) {
 438                 unsafe {
 439                         ptr::copy(arr[0..].as_ptr(), arr[65..].as_mut_ptr(), 19*65);
 440                 }
 441                 for i in 0..65 {
 442                         arr[i] = 0;
 443                 }
 444         }
 445
 446         #[inline]
 447         fn xor_bufs(dst: &mut[u8], src: &[u8]) {
 448                 assert_eq!(dst.len(), src.len());
 449
 450                 for i in 0..dst.len() {
 451                         dst[i] ^= src[i];
 452                 }
 453         }
 454
 455         const ZERO:[u8; 21*65] = [0; 21*65];
 456         fn construct_onion_packet(mut payloads: Vec<msgs::OnionHopData>, onion_keys: Vec<OnionKeys>, associated_data: Vec<u8>) -> Result<msgs::OnionPacket, HandleError> {
 457                 let mut buf = Vec::with_capacity(21*65);
 458                 buf.resize(21*65, 0);
 459
 460                 let filler = {
 461                         let iters = payloads.len() - 1;
 462                         let end_len = iters * 65;
 463                         let mut res = Vec::with_capacity(end_len);
 464                         res.resize(end_len, 0);
 465
 466                         for (i, keys) in onion_keys.iter().enumerate() {
 467                                 if i == payloads.len() - 1 { continue; }
 468                                 let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 469                                 chacha.process(&ChannelManager::ZERO, &mut buf); // We don't have a seek function :(
 470                                 ChannelManager::xor_bufs(&mut res[0..(i + 1)*65], &buf[(20 - i)*65..21*65]);
 471                         }
 472                         res
 473                 };
 474
 475                 let mut packet_data = [0; 20*65];
 476                 let mut hmac_res = [0; 32];
 477
 478                 for (i, (payload, keys)) in payloads.iter_mut().zip(onion_keys.iter()).rev().enumerate() {
 479                         ChannelManager::shift_arr_right(&mut packet_data);
 480                         payload.hmac = hmac_res;
 481                         packet_data[0..65].copy_from_slice(&payload.encode()[..]);
 482
 483                         let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 484                         chacha.process(&packet_data, &mut buf[0..20*65]);
 485                         packet_data[..].copy_from_slice(&buf[0..20*65]);
 486
 487                         if i == 0 {
 488                                 packet_data[20*65 - filler.len()..20*65].copy_from_slice(&filler[..]);
 489                         }
 490
 491                         let mut hmac = Hmac::new(Sha256::new(), &keys.mu);
 492                         hmac.input(&packet_data);
 493                         hmac.input(&associated_data[..]);
 494                         hmac.raw_result(&mut hmac_res);
 495                 }
 496
 497                 Ok(msgs::OnionPacket{
 498                         version: 0,
 499                         public_key: onion_keys.first().unwrap().ephemeral_pubkey,
 500                         hop_data: packet_data,
 501                         hmac: hmac_res,
 502                 })
 503         }
 504
 505         /// Encrypts a failure packet. raw_packet can either be a
 506         /// msgs::DecodedOnionErrorPacket.encode() result or a msgs::OnionErrorPacket.data element.
 507         fn encrypt_failure_packet(shared_secret: &SharedSecret, raw_packet: &[u8]) -> msgs::OnionErrorPacket {
 508                 let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
 509
 510                 let mut packet_crypted = Vec::with_capacity(raw_packet.len());
 511                 packet_crypted.resize(raw_packet.len(), 0);
 512                 let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
 513                 chacha.process(&raw_packet, &mut packet_crypted[..]);
 514                 msgs::OnionErrorPacket {
 515                         data: packet_crypted,
 516                 }
 517         }
 518
 519         fn build_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::DecodedOnionErrorPacket {
 520                 assert!(failure_data.len() <= 256 - 2);
 521
 522                 let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
 523
 524                 let failuremsg = {
 525                         let mut res = Vec::with_capacity(2 + failure_data.len());
 526                         res.push(((failure_type >> 8) & 0xff) as u8);
 527                         res.push(((failure_type >> 0) & 0xff) as u8);
 528                         res.extend_from_slice(&failure_data[..]);
 529                         res
 530                 };
 531                 let pad = {
 532                         let mut res = Vec::with_capacity(256 - 2 - failure_data.len());
 533                         res.resize(256 - 2 - failure_data.len(), 0);
 534                         res
 535                 };
 536                 let mut packet = msgs::DecodedOnionErrorPacket {
 537                         hmac: [0; 32],
 538                         failuremsg: failuremsg,
 539                         pad: pad,
 540                 };
 541
 542                 let mut hmac = Hmac::new(Sha256::new(), &um);
 543                 hmac.input(&packet.encode()[32..]);
 544                 hmac.raw_result(&mut packet.hmac);
 545
 546                 packet
 547         }
 548
 549         #[inline]
 550         fn build_first_hop_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::OnionErrorPacket {
 551                 let failure_packet = ChannelManager::build_failure_packet(shared_secret, failure_type, failure_data);
 552                 ChannelManager::encrypt_failure_packet(shared_secret, &failure_packet.encode()[..])
 553         }
 554
 555         /// only fails if the channel does not yet have an assigned short_id
 556         fn get_channel_update(&self, chan: &mut Channel) -> Result<msgs::ChannelUpdate, HandleError> {
 557                 let short_channel_id = match chan.get_short_channel_id() {
 558                         None => return Err(HandleError{err: "Channel not yet established", msg: None}),
 559                         Some(id) => id,
 560                 };
 561
 562                 let were_node_one = PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).unwrap().serialize()[..] < chan.get_their_node_id().serialize()[..];
 563
 564                 let unsigned = msgs::UnsignedChannelUpdate {
 565                         chain_hash: self.genesis_hash,
 566                         short_channel_id: short_channel_id,
 567                         timestamp: chan.get_channel_update_count(),
 568                         flags: (!were_node_one) as u16 | ((!chan.is_live() as u16) << 1),
 569                         cltv_expiry_delta: CLTV_EXPIRY_DELTA,
 570                         htlc_minimum_msat: chan.get_our_htlc_minimum_msat(),
 571                         fee_base_msat: chan.get_our_fee_base_msat(&*self.fee_estimator),
 572                         fee_proportional_millionths: self.fee_proportional_millionths,
 573                 };
 574
 575                 let msg_hash = Sha256dHash::from_data(&unsigned.encode()[..]);
 576                 let sig = self.secp_ctx.sign(&Message::from_slice(&msg_hash[..]).unwrap(), &self.our_network_key).unwrap(); //TODO Can we unwrap here?
 577
 578                 Ok(msgs::ChannelUpdate {
 579                         signature: sig,
 580                         contents: unsigned
 581                 })
 582         }
 583
 584         /// Sends a payment along a given route, returning the UpdateAddHTLC message to give to the
 585         /// first hop in route. Value parameters are provided via the last hop in route, see
 586         /// documentation for RouteHop fields for more info.
 587         /// See-also docs on Channel::send_htlc_and_commit.
 588         pub fn send_payment(&self, route: Route, payment_hash: [u8; 32]) -> Result<Option<(msgs::UpdateAddHTLC, msgs::CommitmentSigned)>, HandleError> {
 589                 if route.hops.len() < 1 || route.hops.len() > 20 {
 590                         return Err(HandleError{err: "Route didn't go anywhere/had bogus size", msg: None});
 591                 }
 592                 let our_node_id = self.get_our_node_id();
 593                 for (idx, hop) in route.hops.iter().enumerate() {
 594                         if idx != route.hops.len() - 1 && hop.pubkey == our_node_id {
 595                                 return Err(HandleError{err: "Route went through us but wasn't a simple rebalance loop to us", msg: None});
 596                         }
 597                 }
 598
 599                 let session_priv = secp_call!(SecretKey::from_slice(&self.secp_ctx, &{
 600                         let mut session_key = [0; 32];
 601                         rng::fill_bytes(&mut session_key);
 602                         session_key
 603                 }));
 604
 605                 let associated_data = Vec::new(); //TODO: What to put here?
 606
 607                 let onion_keys = ChannelManager::construct_onion_keys(&self.secp_ctx, &route, &session_priv)?;
 608                 let (onion_payloads, htlc_msat, htlc_cltv) = ChannelManager::build_onion_payloads(&route)?;
 609                 let onion_packet = ChannelManager::construct_onion_packet(onion_payloads, onion_keys, associated_data)?;
 610
 611                 let (update_add, commitment_signed, chan_monitor) = {
 612                         let mut channel_state = self.channel_state.lock().unwrap();
 613                         let id = match channel_state.short_to_id.get(&route.hops.first().unwrap().short_channel_id) {
 614                                 None => return Err(HandleError{err: "No channel available with first hop!", msg: None}),
 615                                 Some(id) => id.clone()
 616                         };
 617                         let res = {
 618                                 let chan = channel_state.by_id.get_mut(&id).unwrap();
 619                                 if chan.get_their_node_id() != route.hops.first().unwrap().pubkey {
 620                                         return Err(HandleError{err: "Node ID mismatch on first hop!", msg: None});
 621                                 }
 622                                 chan.send_htlc_and_commit(htlc_msat, payment_hash.clone(), htlc_cltv, onion_packet)?
 623                         };
 624
 625                         if channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::OutboundRoute {
 626                                 route,
 627                                 session_priv,
 628                         }).is_some() {
 629                                 // TODO: We need to track these better, we're not generating these, so a
 630                                 // third-party might make this happen:
 631                                 panic!("payment_hash was repeated! Don't let this happen");
 632                         }
 633
 634                         match res {
 635                                 Some(msgs) => msgs,
 636                                 None => return Ok(None),
 637                         }
 638                 };
 639
 640                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 641                         unimplemented!(); // maybe remove from claimable_htlcs?
 642                 }
 643                 Ok(Some((update_add, commitment_signed)))
 644         }
 645
 646         /// Call this upon creation of a funding transaction for the given channel.
 647         /// Panics if a funding transaction has already been provided for this channel.
 648         pub fn funding_transaction_generated(&self, temporary_channel_id: &Uint256, funding_txo: (Sha256dHash, u16)) {
 649                 let (chan, msg, chan_monitor) = {
 650                         let mut channel_state = self.channel_state.lock().unwrap();
 651                         match channel_state.by_id.remove(&temporary_channel_id) {
 652                                 Some(mut chan) => {
 653                                         match chan.get_outbound_funding_created(funding_txo.0, funding_txo.1) {
 654                                                 Ok(funding_msg) => {
 655                                                         (chan, funding_msg.0, funding_msg.1)
 656                                                 },
 657                                                 Err(_e) => {
 658                                                         //TODO: Push e to pendingevents
 659                                                         return;
 660                                                 }
 661                                         }
 662                                 },
 663                                 None => return
 664                         }
 665                 }; // Release channel lock for install_watch_outpoint call,
 666                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 667                         unimplemented!(); // maybe remove from claimable_htlcs?
 668                 }
 669                 {
 670                         let mut pending_events = self.pending_events.lock().unwrap();
 671                         pending_events.push(events::Event::SendFundingCreated {
 672                                 node_id: chan.get_their_node_id(),
 673                                 msg: msg,
 674                         });
 675                 }
 676
 677                 let mut channel_state = self.channel_state.lock().unwrap();
 678                 channel_state.by_id.insert(chan.channel_id(), chan);
 679         }
 680
 681         fn get_announcement_sigs(&self, chan: &Channel) -> Result<Option<msgs::AnnouncementSignatures>, HandleError> {
 682                 if !chan.is_usable() { return Ok(None) }
 683
 684                 let (announcement, our_bitcoin_sig) = chan.get_channel_announcement(self.get_our_node_id(), self.genesis_hash.clone())?;
 685                 let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
 686                 let our_node_sig = secp_call!(self.secp_ctx.sign(&msghash, &self.our_network_key));
 687
 688                 Ok(Some(msgs::AnnouncementSignatures {
 689                         channel_id: chan.channel_id(),
 690                         short_channel_id: chan.get_short_channel_id().unwrap(),
 691                         node_signature: our_node_sig,
 692                         bitcoin_signature: our_bitcoin_sig,
 693                 }))
 694         }
 695
 696         pub fn process_pending_htlc_forward(&self) {
 697                 let mut new_events = Vec::new();
 698                 let mut failed_forwards = Vec::new();
 699                 {
 700                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 701                         let channel_state = channel_state_lock.borrow_parts();
 702
 703                         if cfg!(not(feature = "fuzztarget")) && Instant::now() < *channel_state.next_forward {
 704                                 return;
 705                         }
 706
 707                         for (short_chan_id, pending_forwards) in channel_state.forward_htlcs.drain() {
 708                                 if short_chan_id != 0 {
 709                                         let forward_chan_id = match channel_state.short_to_id.get(&short_chan_id) {
 710                                                 Some(chan_id) => chan_id.clone(),
 711                                                 None => {
 712                                                         failed_forwards.reserve(pending_forwards.len());
 713                                                         for forward_info in pending_forwards {
 714                                                                 failed_forwards.push((forward_info.payment_hash, 0x4000 | 10, None));
 715                                                         }
 716                                                         // TODO: Send a failure packet back on each pending_forward
 717                                                         continue;
 718                                                 }
 719                                         };
 720                                         let forward_chan = &mut channel_state.by_id.get_mut(&forward_chan_id).unwrap();
 721
 722                                         let mut add_htlc_msgs = Vec::new();
 723                                         for forward_info in pending_forwards {
 724                                                 match forward_chan.send_htlc(forward_info.amt_to_forward, forward_info.payment_hash, forward_info.outgoing_cltv_value, forward_info.onion_packet.unwrap()) {
 725                                                         Err(_e) => {
 726                                                                 let chan_update = self.get_channel_update(forward_chan).unwrap();
 727                                                                 failed_forwards.push((forward_info.payment_hash, 0x4000 | 7, Some(chan_update)));
 728                                                                 continue;
 729                                                         },
 730                                                         Ok(update_add) => {
 731                                                                 match update_add {
 732                                                                         Some(msg) => { add_htlc_msgs.push(msg); },
 733                                                                         None => {
 734                                                                                 // Nothing to do here...we're waiting on a remote
 735                                                                                 // revoke_and_ack before we can add anymore HTLCs. The Channel
 736                                                                                 // will automatically handle building the update_add_htlc and
 737                                                                                 // commitment_signed messages when we can.
 738                                                                                 // TODO: Do some kind of timer to set the channel as !is_live()
 739                                                                                 // as we don't really want others relying on us relaying through
 740                                                                                 // this channel currently :/.
 741                                                                         }
 742                                                                 }
 743                                                         }
 744                                                 }
 745                                         }
 746
 747                                         if !add_htlc_msgs.is_empty() {
 748                                                 let (commitment_msg, monitor) = match forward_chan.send_commitment() {
 749                                                         Ok(res) => res,
 750                                                         Err(_) => {
 751                                                                 //TODO: Handle...this is bad!
 752                                                                 continue;
 753                                                         },
 754                                                 };
 755                                                 new_events.push((Some(monitor), events::Event::SendHTLCs {
 756                                                         node_id: forward_chan.get_their_node_id(),
 757                                                         msgs: add_htlc_msgs,
 758                                                         commitment_msg: commitment_msg,
 759                                                 }));
 760                                         }
 761                                 } else {
 762                                         for forward_info in pending_forwards {
 763                                                 new_events.push((None, events::Event::PaymentReceived {
 764                                                         payment_hash: forward_info.payment_hash,
 765                                                         amt: forward_info.amt_to_forward,
 766                                                 }));
 767                                         }
 768                                 }
 769                         }
 770                 }
 771
 772                 for failed_forward in failed_forwards.drain(..) {
 773                         match failed_forward.2 {
 774                                 None => self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &failed_forward.0, HTLCFailReason::Reason { failure_code: failed_forward.1, data: Vec::new() }),
 775                                 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() }),
 776                         };
 777                 }
 778
 779                 if new_events.is_empty() { return }
 780
 781                 new_events.retain(|event| {
 782                         if let &Some(ref monitor) = &event.0 {
 783                                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor.clone()) {
 784                                         unimplemented!();// but def dont push the event...
 785                                 }
 786                         }
 787                         true
 788                 });
 789
 790                 let mut events = self.pending_events.lock().unwrap();
 791                 events.reserve(new_events.len());
 792                 for event in new_events.drain(..) {
 793                         events.push(event.1);
 794                 }
 795         }
 796
 797         /// Indicates that the preimage for payment_hash is unknown after a PaymentReceived event.
 798         pub fn fail_htlc_backwards(&self, payment_hash: &[u8; 32]) -> bool {
 799                 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 15, data: Vec::new() })
 800         }
 801
 802         fn fail_htlc_backwards_internal(&self, mut channel_state: MutexGuard<ChannelHolder>, payment_hash: &[u8; 32], onion_error: HTLCFailReason) -> bool {
 803                 let mut pending_htlc = {
 804                         match channel_state.claimable_htlcs.remove(payment_hash) {
 805                                 Some(pending_htlc) => pending_htlc,
 806                                 None => return false,
 807                         }
 808                 };
 809
 810                 match pending_htlc {
 811                         PendingOutboundHTLC::CycledRoute { source_short_channel_id, incoming_packet_shared_secret, route, session_priv } => {
 812                                 channel_state.claimable_htlcs.insert(payment_hash.clone(), PendingOutboundHTLC::OutboundRoute {
 813                                         route,
 814                                         session_priv,
 815                                 });
 816                                 pending_htlc = PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret };
 817                         },
 818                         _ => {}
 819                 }
 820
 821                 match pending_htlc {
 822                         PendingOutboundHTLC::CycledRoute { .. } => { panic!("WAT"); },
 823                         PendingOutboundHTLC::OutboundRoute { .. } => {
 824                                 mem::drop(channel_state);
 825
 826                                 let mut pending_events = self.pending_events.lock().unwrap();
 827                                 pending_events.push(events::Event::PaymentFailed {
 828                                         payment_hash: payment_hash.clone()
 829                                 });
 830                                 false
 831                         },
 832                         PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret } => {
 833                                 let err_packet = match onion_error {
 834                                         HTLCFailReason::Reason { failure_code, data } => {
 835                                                 let packet = ChannelManager::build_failure_packet(&incoming_packet_shared_secret, failure_code, &data[..]).encode();
 836                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &packet)
 837                                         },
 838                                         HTLCFailReason::ErrorPacket { err } => {
 839                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &err.data)
 840                                         }
 841                                 };
 842
 843                                 let (node_id, fail_msgs) = {
 844                                         let chan_id = match channel_state.short_to_id.get(&source_short_channel_id) {
 845                                                 Some(chan_id) => chan_id.clone(),
 846                                                 None => return false
 847                                         };
 848
 849                                         let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
 850                                         match chan.get_update_fail_htlc_and_commit(payment_hash, err_packet) {
 851                                                 Ok(msg) => (chan.get_their_node_id(), msg),
 852                                                 Err(_e) => {
 853                                                         //TODO: Do something with e?
 854                                                         return false;
 855                                                 },
 856                                         }
 857                                 };
 858
 859                                 match fail_msgs {
 860                                         Some((msg, commitment_msg, chan_monitor)) => {
 861                                                 mem::drop(channel_state);
 862
 863                                                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 864                                                         unimplemented!();// but def dont push the event...
 865                                                 }
 866
 867                                                 let mut pending_events = self.pending_events.lock().unwrap();
 868                                                 pending_events.push(events::Event::SendFailHTLC {
 869                                                         node_id,
 870                                                         msg: msg,
 871                                                         commitment_msg: commitment_msg,
 872                                                 });
 873                                         },
 874                                         None => {},
 875                                 }
 876
 877                                 true
 878                         },
 879                 }
 880         }
 881
 882         /// Provides a payment preimage in response to a PaymentReceived event, returning true and
 883         /// generating message events for the net layer to claim the payment, if possible. Thus, you
 884         /// should probably kick the net layer to go send messages if this returns true!
 885         /// May panic if called except in response to a PaymentReceived event.
 886         pub fn claim_funds(&self, payment_preimage: [u8; 32]) -> bool {
 887                 self.claim_funds_internal(payment_preimage, true)
 888         }
 889         pub fn claim_funds_internal(&self, payment_preimage: [u8; 32], from_user: bool) -> bool {
 890                 let mut sha = Sha256::new();
 891                 sha.input(&payment_preimage);
 892                 let mut payment_hash = [0; 32];
 893                 sha.result(&mut payment_hash);
 894
 895                 let mut channel_state = self.channel_state.lock().unwrap();
 896                 let mut pending_htlc = {
 897                         match channel_state.claimable_htlcs.remove(&payment_hash) {
 898                                 Some(pending_htlc) => pending_htlc,
 899                                 None => return false,
 900                         }
 901                 };
 902
 903                 match pending_htlc {
 904                         PendingOutboundHTLC::CycledRoute { source_short_channel_id, incoming_packet_shared_secret, route, session_priv } => {
 905                                 if from_user { // This was the end hop back to us
 906                                         pending_htlc = PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret };
 907                                         channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::OutboundRoute { route, session_priv });
 908                                 } else { // This came from the first upstream node
 909                                         // Bank error in our favor! Maybe we should tell the user this somehow???
 910                                         pending_htlc = PendingOutboundHTLC::OutboundRoute { route, session_priv };
 911                                         channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret });
 912                                 }
 913                         },
 914                         _ => {},
 915                 }
 916
 917                 match pending_htlc {
 918                         PendingOutboundHTLC::CycledRoute { .. } => { panic!("WAT"); },
 919                         PendingOutboundHTLC::OutboundRoute { .. } => {
 920                                 if from_user {
 921                                         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...");
 922                                 }
 923                                 mem::drop(channel_state);
 924                                 let mut pending_events = self.pending_events.lock().unwrap();
 925                                 pending_events.push(events::Event::PaymentSent {
 926                                         payment_preimage
 927                                 });
 928                                 false
 929                         },
 930                         PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, .. } => {
 931                                 let (node_id, fulfill_msgs) = {
 932                                         let chan_id = match channel_state.short_to_id.get(&source_short_channel_id) {
 933                                                 Some(chan_id) => chan_id.clone(),
 934                                                 None => return false
 935                                         };
 936
 937                                         let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
 938                                         match chan.get_update_fulfill_htlc_and_commit(payment_preimage) {
 939                                                 Ok(msg) => (chan.get_their_node_id(), msg),
 940                                                 Err(_e) => {
 941                                                         //TODO: Do something with e?
 942                                                         return false;
 943                                                 },
 944                                         }
 945                                 };
 946
 947                                 mem::drop(channel_state);
 948                                 match fulfill_msgs {
 949                                         Some((msg, commitment_msg, chan_monitor)) => {
 950                                                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 951                                                         unimplemented!();// but def dont push the event...
 952                                                 }
 953
 954                                                 let mut pending_events = self.pending_events.lock().unwrap();
 955                                                 pending_events.push(events::Event::SendFulfillHTLC {
 956                                                         node_id: node_id,
 957                                                         msg,
 958                                                         commitment_msg,
 959                                                 });
 960                                         },
 961                                         None => {},
 962                                 }
 963                                 true
 964                         },
 965                 }
 966         }
 967
 968         /// Gets the node_id held by this ChannelManager
 969         pub fn get_our_node_id(&self) -> PublicKey {
 970                 PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).unwrap()
 971         }
 972
 973         /// Used to restore channels to normal operation after a
 974         /// ChannelMonitorUpdateErr::TemporaryFailure was returned from a channel monitor update
 975         /// operation.
 976         pub fn test_restore_channel_monitor(&self) {
 977                 unimplemented!();
 978         }
 979 }
 980
 981 impl events::EventsProvider for ChannelManager {
 982         fn get_and_clear_pending_events(&self) -> Vec<events::Event> {
 983                 let mut pending_events = self.pending_events.lock().unwrap();
 984                 let mut ret = Vec::new();
 985                 mem::swap(&mut ret, &mut *pending_events);
 986                 ret
 987         }
 988 }
 989
 990 impl ChainListener for ChannelManager {
 991         fn block_connected(&self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) {
 992                 let mut new_funding_locked_messages = Vec::new();
 993                 {
 994                         let mut channel_state = self.channel_state.lock().unwrap();
 995                         let mut short_to_ids_to_insert = Vec::new();
 996                         let mut short_to_ids_to_remove = Vec::new();
 997                         channel_state.by_id.retain(|_, channel| {
 998                                 if let Some(funding_locked) = channel.block_connected(header, height, txn_matched, indexes_of_txn_matched) {
 999                                         let announcement_sigs = match self.get_announcement_sigs(channel) {
1000                                                 Ok(res) => res,
1001                                                 Err(_e) => {
1002                                                         //TODO: push e on events and blow up the channel (it has bad keys)
1003                                                         return true;
1004                                                 }
1005                                         };
1006                                         new_funding_locked_messages.push(events::Event::SendFundingLocked {
1007                                                 node_id: channel.get_their_node_id(),
1008                                                 msg: funding_locked,
1009                                                 announcement_sigs: announcement_sigs
1010                                         });
1011                                         short_to_ids_to_insert.push((channel.get_short_channel_id().unwrap(), channel.channel_id()));
1012                                 }
1013                                 if let Some(funding_txo) = channel.get_funding_txo() {
1014                                         for tx in txn_matched {
1015                                                 for inp in tx.input.iter() {
1016                                                         if inp.prev_hash == funding_txo.0 && inp.prev_index == funding_txo.1 as u32 {
1017                                                                 if let Some(short_id) = channel.get_short_channel_id() {
1018                                                                         short_to_ids_to_remove.push(short_id);
1019                                                                 }
1020                                                                 channel.force_shutdown();
1021                                                                 return false;
1022                                                         }
1023                                                 }
1024                                         }
1025                                 }
1026                                 if channel.channel_monitor().would_broadcast_at_height(height) {
1027                                         if let Some(short_id) = channel.get_short_channel_id() {
1028                                                 short_to_ids_to_remove.push(short_id);
1029                                         }
1030                                         channel.force_shutdown();
1031                                         return false;
1032                                 }
1033                                 true
1034                         });
1035                         for to_remove in short_to_ids_to_remove {
1036                                 channel_state.short_to_id.remove(&to_remove);
1037                         }
1038                         for to_insert in short_to_ids_to_insert {
1039                                 channel_state.short_to_id.insert(to_insert.0, to_insert.1);
1040                         }
1041                 }
1042                 let mut pending_events = self.pending_events.lock().unwrap();
1043                 for funding_locked in new_funding_locked_messages.drain(..) {
1044                         pending_events.push(funding_locked);
1045                 }
1046         }
1047
1048         fn block_disconnected(&self, header: &BlockHeader) {
1049                 let mut channel_state = self.channel_state.lock().unwrap();
1050                 for channel in channel_state.by_id.values_mut() {
1051                         if channel.block_disconnected(header) {
1052                                 //TODO Close channel here
1053                         }
1054                 }
1055         }
1056 }
1057
1058 impl ChannelMessageHandler for ChannelManager {
1059         //TODO: Handle errors and close channel (or so)
1060         fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &msgs::OpenChannel) -> Result<msgs::AcceptChannel, HandleError> {
1061                 if msg.chain_hash != self.genesis_hash {
1062                         return Err(HandleError{err: "Unknown genesis block hash", msg: None});
1063                 }
1064                 let mut channel_state = self.channel_state.lock().unwrap();
1065                 if channel_state.by_id.contains_key(&msg.temporary_channel_id) {
1066                         return Err(HandleError{err: "temporary_channel_id collision!", msg: None});
1067                 }
1068
1069                 let chan_keys = if cfg!(feature = "fuzztarget") {
1070                         ChannelKeys {
1071                                 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(),
1072                                 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(),
1073                                 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(),
1074                                 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(),
1075                                 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(),
1076                                 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(),
1077                                 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(),
1078                                 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],
1079                         }
1080                 } else {
1081                         let mut key_seed = [0u8; 32];
1082                         rng::fill_bytes(&mut key_seed);
1083                         match ChannelKeys::new_from_seed(&key_seed) {
1084                                 Ok(key) => key,
1085                                 Err(_) => panic!("RNG is busted!")
1086                         }
1087                 };
1088
1089                 let channel = Channel::new_from_req(&*self.fee_estimator, chan_keys, their_node_id.clone(), msg, 0, self.announce_channels_publicly)?;
1090                 let accept_msg = channel.get_accept_channel()?;
1091                 channel_state.by_id.insert(channel.channel_id(), channel);
1092                 Ok(accept_msg)
1093         }
1094
1095         fn handle_accept_channel(&self, their_node_id: &PublicKey, msg: &msgs::AcceptChannel) -> Result<(), HandleError> {
1096                 let (value, output_script, user_id) = {
1097                         let mut channel_state = self.channel_state.lock().unwrap();
1098                         match channel_state.by_id.get_mut(&msg.temporary_channel_id) {
1099                                 Some(chan) => {
1100                                         if chan.get_their_node_id() != *their_node_id {
1101                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1102                                         }
1103                                         chan.accept_channel(&msg)?;
1104                                         (chan.get_value_satoshis(), chan.get_funding_redeemscript().to_v0_p2wsh(), chan.get_user_id())
1105                                 },
1106                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1107                         }
1108                 };
1109                 let mut pending_events = self.pending_events.lock().unwrap();
1110                 pending_events.push(events::Event::FundingGenerationReady {
1111                         temporary_channel_id: msg.temporary_channel_id,
1112                         channel_value_satoshis: value,
1113                         output_script: output_script,
1114                         user_channel_id: user_id,
1115                 });
1116                 Ok(())
1117         }
1118
1119         fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) -> Result<msgs::FundingSigned, HandleError> {
1120                 //TODO: broke this - a node shouldn't be able to get their channel removed by sending a
1121                 //funding_created a second time, or long after the first, or whatever (note this also
1122                 //leaves the short_to_id map in a busted state.
1123                 let (chan, funding_msg, monitor_update) = {
1124                         let mut channel_state = self.channel_state.lock().unwrap();
1125                         match channel_state.by_id.remove(&msg.temporary_channel_id) {
1126                                 Some(mut chan) => {
1127                                         if chan.get_their_node_id() != *their_node_id {
1128                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1129                                         }
1130                                         match chan.funding_created(msg) {
1131                                                 Ok((funding_msg, monitor_update)) => {
1132                                                         (chan, funding_msg, monitor_update)
1133                                                 },
1134                                                 Err(e) => {
1135                                                         return Err(e);
1136                                                 }
1137                                         }
1138                                 },
1139                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1140                         }
1141                 }; // Release channel lock for install_watch_outpoint call,
1142                    // note that this means if the remote end is misbehaving and sends a message for the same
1143                    // channel back-to-back with funding_created, we'll end up thinking they sent a message
1144                    // for a bogus channel.
1145                 if let Err(_e) = self.monitor.add_update_monitor(monitor_update.get_funding_txo().unwrap(), monitor_update) {
1146                         unimplemented!();
1147                 }
1148                 let mut channel_state = self.channel_state.lock().unwrap();
1149                 channel_state.by_id.insert(funding_msg.channel_id, chan);
1150                 Ok(funding_msg)
1151         }
1152
1153         fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) -> Result<(), HandleError> {
1154                 let (funding_txo, user_id, monitor) = {
1155                         let mut channel_state = self.channel_state.lock().unwrap();
1156                         match channel_state.by_id.get_mut(&msg.channel_id) {
1157                                 Some(chan) => {
1158                                         if chan.get_their_node_id() != *their_node_id {
1159                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1160                                         }
1161                                         let chan_monitor = chan.funding_signed(&msg)?;
1162                                         (chan.get_funding_txo().unwrap(), chan.get_user_id(), chan_monitor)
1163                                 },
1164                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1165                         }
1166                 };
1167                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor) {
1168                         unimplemented!();
1169                 }
1170                 let mut pending_events = self.pending_events.lock().unwrap();
1171                 pending_events.push(events::Event::FundingBroadcastSafe {
1172                         funding_txo: funding_txo,
1173                         user_channel_id: user_id,
1174                 });
1175                 Ok(())
1176         }
1177
1178         fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &msgs::FundingLocked) -> Result<Option<msgs::AnnouncementSignatures>, HandleError> {
1179                 let mut channel_state = self.channel_state.lock().unwrap();
1180                 match channel_state.by_id.get_mut(&msg.channel_id) {
1181                         Some(chan) => {
1182                                 if chan.get_their_node_id() != *their_node_id {
1183                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1184                                 }
1185                                 chan.funding_locked(&msg)?;
1186                                 return Ok(self.get_announcement_sigs(chan)?);
1187                         },
1188                         None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1189                 };
1190         }
1191
1192         fn handle_shutdown(&self, their_node_id: &PublicKey, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>), HandleError> {
1193                 let res = {
1194                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1195                         let channel_state = channel_state_lock.borrow_parts();
1196
1197                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1198                                 hash_map::Entry::Occupied(mut chan_entry) => {
1199                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1200                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1201                                         }
1202                                         let res = chan_entry.get_mut().shutdown(&*self.fee_estimator, &msg)?;
1203                                         if chan_entry.get().is_shutdown() {
1204                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
1205                                                         channel_state.short_to_id.remove(&short_id);
1206                                                 }
1207                                                 chan_entry.remove_entry();
1208                                         }
1209                                         res
1210                                 },
1211                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1212                         }
1213                 };
1214                 for payment_hash in res.2 {
1215                         // unknown_next_peer...I dunno who that is anymore....
1216                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
1217                 }
1218                 Ok((res.0, res.1))
1219         }
1220
1221         fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &msgs::ClosingSigned) -> Result<Option<msgs::ClosingSigned>, HandleError> {
1222                 let res = {
1223                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1224                         let channel_state = channel_state_lock.borrow_parts();
1225                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1226                                 hash_map::Entry::Occupied(mut chan_entry) => {
1227                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1228                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1229                                         }
1230                                         let res = chan_entry.get_mut().closing_signed(&*self.fee_estimator, &msg)?;
1231                                         if res.1.is_some() {
1232                                                 // We're done with this channel, we've got a signed closing transaction and
1233                                                 // will send the closing_signed back to the remote peer upon return. This
1234                                                 // also implies there are no pending HTLCs left on the channel, so we can
1235                                                 // fully delete it from tracking (the channel monitor is still around to
1236                                                 // watch for old state broadcasts)!
1237                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
1238                                                         channel_state.short_to_id.remove(&short_id);
1239                                                 }
1240                                                 chan_entry.remove_entry();
1241                                         }
1242                                         res
1243                                 },
1244                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1245                         }
1246                 };
1247                 if let Some(broadcast_tx) = res.1 {
1248                         self.tx_broadcaster.broadcast_transaction(&broadcast_tx);
1249                 }
1250                 Ok(res.0)
1251         }
1252
1253         fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) -> Result<(), msgs::HandleError> {
1254                 //TODO: BOLT 4 points out a specific attack where a peer may re-send an onion packet and
1255                 //determine the state of the payment based on our response/if we forward anything/the time
1256                 //we take to respond. We should take care to avoid allowing such an attack.
1257                 //
1258                 //TODO: There exists a further attack where a node may garble the onion data, forward it to
1259                 //us repeatedly garbled in different ways, and compare our error messages, which are
1260                 //encrypted with the same key. Its not immediately obvious how to usefully exploit that,
1261                 //but we should prevent it anyway.
1262
1263                 let shared_secret = SharedSecret::new(&self.secp_ctx, &msg.onion_routing_packet.public_key, &self.our_network_key);
1264                 let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
1265
1266                 let associated_data = Vec::new(); //TODO: What to put here?
1267
1268                 macro_rules! get_onion_hash {
1269                         () => {
1270                                 {
1271                                         let mut sha = Sha256::new();
1272                                         sha.input(&msg.onion_routing_packet.hop_data);
1273                                         let mut onion_hash = [0; 32];
1274                                         sha.result(&mut onion_hash);
1275                                         onion_hash
1276                                 }
1277                         }
1278                 }
1279
1280                 macro_rules! return_err {
1281                         ($msg: expr, $err_code: expr, $data: expr) => {
1282                                 return Err(msgs::HandleError {
1283                                         err: $msg,
1284                                         msg: Some(msgs::ErrorAction::UpdateFailHTLC {
1285                                                 msg: msgs::UpdateFailHTLC {
1286                                                         channel_id: msg.channel_id,
1287                                                         htlc_id: msg.htlc_id,
1288                                                         reason: ChannelManager::build_first_hop_failure_packet(&shared_secret, $err_code, $data),
1289                                                 }
1290                                         }),
1291                                 });
1292                         }
1293                 }
1294
1295                 if msg.onion_routing_packet.version != 0 {
1296                         //TODO: Spec doesn't indicate if we should only hash hop_data here (and in other
1297                         //sha256_of_onion error data packets), or the entire onion_routing_packet. Either way,
1298                         //the hash doesn't really serve any purpuse - in the case of hashing all data, the
1299                         //receiving node would have to brute force to figure out which version was put in the
1300                         //packet by the node that send us the message, in the case of hashing the hop_data, the
1301                         //node knows the HMAC matched, so they already know what is there...
1302                         return_err!("Unknown onion packet version", 0x8000 | 0x4000 | 4, &get_onion_hash!());
1303                 }
1304
1305                 let mut hmac = Hmac::new(Sha256::new(), &mu);
1306                 hmac.input(&msg.onion_routing_packet.hop_data);
1307                 hmac.input(&associated_data[..]);
1308                 if hmac.result() != MacResult::new(&msg.onion_routing_packet.hmac) {
1309                         return_err!("HMAC Check failed", 0x8000 | 0x4000 | 5, &get_onion_hash!());
1310                 }
1311
1312                 let mut chacha = ChaCha20::new(&rho, &[0u8; 8]);
1313                 let next_hop_data = {
1314                         let mut decoded = [0; 65];
1315                         chacha.process(&msg.onion_routing_packet.hop_data[0..65], &mut decoded);
1316                         match msgs::OnionHopData::decode(&decoded[..]) {
1317                                 Err(err) => {
1318                                         let error_code = match err {
1319                                                 msgs::DecodeError::UnknownRealmByte => 0x4000 | 1,
1320                                                 _ => 0x2000 | 2, // Should never happen
1321                                         };
1322                                         return_err!("Unable to decode our hop data", error_code, &[0;0]);
1323                                 },
1324                                 Ok(msg) => msg
1325                         }
1326                 };
1327
1328                 let mut pending_forward_info = if next_hop_data.hmac == [0; 32] {
1329                                 // OUR PAYMENT!
1330                                 if next_hop_data.data.amt_to_forward != msg.amount_msat {
1331                                         return_err!("Upstream node sent less than we were supposed to receive in payment", 19, &byte_utils::be64_to_array(msg.amount_msat));
1332                                 }
1333                                 if next_hop_data.data.outgoing_cltv_value != msg.cltv_expiry {
1334                                         return_err!("Upstream node set CLTV to the wrong value", 18, &byte_utils::be32_to_array(msg.cltv_expiry));
1335                                 }
1336
1337                                 // Note that we could obviously respond immediately with an update_fulfill_htlc
1338                                 // message, however that would leak that we are the recipient of this payment, so
1339                                 // instead we stay symmetric with the forwarding case, only responding (after a
1340                                 // delay) once they've send us a commitment_signed!
1341
1342                                 PendingForwardHTLCInfo {
1343                                         onion_packet: None,
1344                                         payment_hash: msg.payment_hash.clone(),
1345                                         short_channel_id: 0,
1346                                         prev_short_channel_id: 0,
1347                                         amt_to_forward: next_hop_data.data.amt_to_forward,
1348                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
1349                                 }
1350                         } else {
1351                                 let mut new_packet_data = [0; 20*65];
1352                                 chacha.process(&msg.onion_routing_packet.hop_data[65..], &mut new_packet_data[0..19*65]);
1353                                 chacha.process(&ChannelManager::ZERO[0..65], &mut new_packet_data[19*65..]);
1354
1355                                 let mut new_pubkey = msg.onion_routing_packet.public_key.clone();
1356
1357                                 let blinding_factor = {
1358                                         let mut sha = Sha256::new();
1359                                         sha.input(&new_pubkey.serialize()[..]);
1360                                         sha.input(&shared_secret[..]);
1361                                         let mut res = [0u8; 32];
1362                                         sha.result(&mut res);
1363                                         match SecretKey::from_slice(&self.secp_ctx, &res) {
1364                                                 Err(_) => {
1365                                                         // Return temporary node failure as its technically our issue, not the
1366                                                         // channel's issue.
1367                                                         return_err!("Blinding factor is an invalid private key", 0x2000 | 2, &[0;0]);
1368                                                 },
1369                                                 Ok(key) => key
1370                                         }
1371                                 };
1372
1373                                 match new_pubkey.mul_assign(&self.secp_ctx, &blinding_factor) {
1374                                         Err(_) => {
1375                                                 // Return temporary node failure as its technically our issue, not the
1376                                                 // channel's issue.
1377                                                 return_err!("New blinding factor is an invalid private key", 0x2000 | 2, &[0;0]);
1378                                         },
1379                                         Ok(_) => {}
1380                                 };
1381
1382                                 let outgoing_packet = msgs::OnionPacket {
1383                                         version: 0,
1384                                         public_key: new_pubkey,
1385                                         hop_data: new_packet_data,
1386                                         hmac: next_hop_data.hmac.clone(),
1387                                 };
1388
1389                                 //TODO: Check amt_to_forward and outgoing_cltv_value are within acceptable ranges!
1390
1391                                 PendingForwardHTLCInfo {
1392                                         onion_packet: Some(outgoing_packet),
1393                                         payment_hash: msg.payment_hash.clone(),
1394                                         short_channel_id: next_hop_data.data.short_channel_id,
1395                                         prev_short_channel_id: 0,
1396                                         amt_to_forward: next_hop_data.data.amt_to_forward,
1397                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
1398                                 }
1399                         };
1400
1401                 let mut channel_state_lock = self.channel_state.lock().unwrap();
1402                 let channel_state = channel_state_lock.borrow_parts();
1403
1404                 if pending_forward_info.onion_packet.is_some() { // If short_channel_id is 0 here, we'll reject them in the body here
1405                         let forwarding_id = match channel_state.short_to_id.get(&pending_forward_info.short_channel_id) {
1406                                 None => {
1407                                         return_err!("Don't have available channel for forwarding as requested.", 0x4000 | 10, &[0;0]);
1408                                 },
1409                                 Some(id) => id.clone(),
1410                         };
1411                         let chan = channel_state.by_id.get_mut(&forwarding_id).unwrap();
1412                         if !chan.is_live() {
1413                                 let chan_update = self.get_channel_update(chan).unwrap();
1414                                 return_err!("Forwarding channel is not in a ready state.", 0x4000 | 7, &chan_update.encode_with_len()[..]);
1415                         }
1416                 }
1417
1418                 let claimable_htlcs_entry = channel_state.claimable_htlcs.entry(msg.payment_hash.clone());
1419
1420                 // We dont correctly handle payments that route through us twice on their way to their
1421                 // destination. That's OK since those nodes are probably busted or trying to do network
1422                 // mapping through repeated loops. In either case, we want them to stop talking to us, so
1423                 // we send permanent_node_failure.
1424                 match &claimable_htlcs_entry {
1425                         &hash_map::Entry::Occupied(ref e) => {
1426                                 let mut acceptable_cycle = false;
1427                                 match e.get() {
1428                                         &PendingOutboundHTLC::OutboundRoute { .. } => {
1429                                                 acceptable_cycle = pending_forward_info.short_channel_id == 0;
1430                                         },
1431                                         _ => {},
1432                                 }
1433                                 if !acceptable_cycle {
1434                                         return_err!("Payment looped through us twice", 0x4000 | 0x2000 | 2, &[0;0]);
1435                                 }
1436                         },
1437                         _ => {},
1438                 }
1439
1440                 let (source_short_channel_id, res) = match channel_state.by_id.get_mut(&msg.channel_id) {
1441                         Some(chan) => {
1442                                 if chan.get_their_node_id() != *their_node_id {
1443                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1444                                 }
1445                                 if !chan.is_usable() {
1446                                         return Err(HandleError{err: "Channel not yet available for receiving HTLCs", msg: None});
1447                                 }
1448                                 let short_channel_id = chan.get_short_channel_id().unwrap();
1449                                 pending_forward_info.prev_short_channel_id = short_channel_id;
1450                                 (short_channel_id, chan.update_add_htlc(&msg, pending_forward_info)?)
1451                         },
1452                         None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None}), //TODO: panic?
1453                 };
1454
1455                 match claimable_htlcs_entry {
1456                         hash_map::Entry::Occupied(mut e) => {
1457                                 let outbound_route = e.get_mut();
1458                                 let (route, session_priv) = match outbound_route {
1459                                         &mut PendingOutboundHTLC::OutboundRoute { ref route, ref session_priv } => {
1460                                                 (route.clone(), session_priv.clone())
1461                                         },
1462                                         _ => { panic!("WAT") },
1463                                 };
1464                                 *outbound_route = PendingOutboundHTLC::CycledRoute {
1465                                         source_short_channel_id,
1466                                         incoming_packet_shared_secret: shared_secret,
1467                                         route,
1468                                         session_priv,
1469                                 };
1470                         },
1471                         hash_map::Entry::Vacant(e) => {
1472                                 e.insert(PendingOutboundHTLC::IntermediaryHopData {
1473                                         source_short_channel_id,
1474                                         incoming_packet_shared_secret: shared_secret,
1475                                 });
1476                         }
1477                 }
1478
1479                 Ok(res)
1480         }
1481
1482         fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) -> Result<(), HandleError> {
1483                 //TODO: Delay the claimed_funds relaying just like we do outbound relay!
1484                 // Claim funds first, cause we don't really care if the channel we received the message on
1485                 // is broken, we may have enough info to get our own money!
1486                 self.claim_funds_internal(msg.payment_preimage.clone(), false);
1487
1488                 let monitor = {
1489                         let mut channel_state = self.channel_state.lock().unwrap();
1490                         match channel_state.by_id.get_mut(&msg.channel_id) {
1491                                 Some(chan) => {
1492                                         if chan.get_their_node_id() != *their_node_id {
1493                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1494                                         }
1495                                         chan.update_fulfill_htlc(&msg)?
1496                                 },
1497                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1498                         }
1499                 };
1500                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor) {
1501                         unimplemented!();
1502                 }
1503                 Ok(())
1504         }
1505
1506         fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) -> Result<Option<msgs::HTLCFailChannelUpdate>, HandleError> {
1507                 let mut channel_state = self.channel_state.lock().unwrap();
1508                 let payment_hash = match channel_state.by_id.get_mut(&msg.channel_id) {
1509                         Some(chan) => {
1510                                 if chan.get_their_node_id() != *their_node_id {
1511                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1512                                 }
1513                                 chan.update_fail_htlc(&msg, HTLCFailReason::ErrorPacket { err: msg.reason.clone() })
1514                         },
1515                         None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1516                 }?;
1517
1518                 if let Some(pending_htlc) = channel_state.claimable_htlcs.get(&payment_hash) {
1519                         match pending_htlc {
1520                                 &PendingOutboundHTLC::OutboundRoute { ref route, ref session_priv } => {
1521                                         // Handle packed channel/node updates for passing back for the route handler
1522                                         let mut packet_decrypted = msg.reason.data.clone();
1523                                         let mut res = None;
1524                                         Self::construct_onion_keys_callback(&self.secp_ctx, &route, &session_priv, |shared_secret, _, _, route_hop| {
1525                                                 if res.is_some() { return; }
1526
1527                                                 let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
1528
1529                                                 let mut decryption_tmp = Vec::with_capacity(packet_decrypted.len());
1530                                                 decryption_tmp.resize(packet_decrypted.len(), 0);
1531                                                 let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
1532                                                 chacha.process(&packet_decrypted, &mut decryption_tmp[..]);
1533                                                 packet_decrypted = decryption_tmp;
1534
1535                                                 if let Ok(err_packet) = msgs::DecodedOnionErrorPacket::decode(&packet_decrypted) {
1536                                                         if err_packet.failuremsg.len() >= 2 {
1537                                                                 let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
1538
1539                                                                 let mut hmac = Hmac::new(Sha256::new(), &um);
1540                                                                 hmac.input(&err_packet.encode()[32..]);
1541                                                                 let mut calc_tag =  [0u8; 32];
1542                                                                 hmac.raw_result(&mut calc_tag);
1543                                                                 if crypto::util::fixed_time_eq(&calc_tag, &err_packet.hmac) {
1544                                                                         const UNKNOWN_CHAN: u16 = 0x4000|10;
1545                                                                         const TEMP_CHAN_FAILURE: u16 = 0x4000|7;
1546                                                                         match byte_utils::slice_to_be16(&err_packet.failuremsg[0..2]) {
1547                                                                                 TEMP_CHAN_FAILURE => {
1548                                                                                         if err_packet.failuremsg.len() >= 4 {
1549                                                                                                 let update_len = byte_utils::slice_to_be16(&err_packet.failuremsg[2..4]) as usize;
1550                                                                                                 if err_packet.failuremsg.len() >= 4 + update_len {
1551                                                                                                         if let Ok(chan_update) = msgs::ChannelUpdate::decode(&err_packet.failuremsg[4..4 + update_len]) {
1552                                                                                                                 res = Some(msgs::HTLCFailChannelUpdate::ChannelUpdateMessage {
1553                                                                                                                         msg: chan_update,
1554                                                                                                                 });
1555                                                                                                         }
1556                                                                                                 }
1557                                                                                         }
1558                                                                                 },
1559                                                                                 UNKNOWN_CHAN => {
1560                                                                                         // No such next-hop. We know this came from the
1561                                                                                         // current node as the HMAC validated.
1562                                                                                         res = Some(msgs::HTLCFailChannelUpdate::ChannelClosed {
1563                                                                                                 short_channel_id: route_hop.short_channel_id
1564                                                                                         });
1565                                                                                 },
1566                                                                                 _ => {}, //TODO: Enumerate all of these!
1567                                                                         }
1568                                                                 }
1569                                                         }
1570                                                 }
1571                                         }).unwrap();
1572                                         Ok(res)
1573                                 },
1574                                 _ => { Ok(None) },
1575                         }
1576                 } else {
1577                         Ok(None)
1578                 }
1579         }
1580
1581         fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) -> Result<(), HandleError> {
1582                 let mut channel_state = self.channel_state.lock().unwrap();
1583                 match channel_state.by_id.get_mut(&msg.channel_id) {
1584                         Some(chan) => {
1585                                 if chan.get_their_node_id() != *their_node_id {
1586                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1587                                 }
1588                                 chan.update_fail_malformed_htlc(&msg, HTLCFailReason::Reason { failure_code: msg.failure_code, data: Vec::new() })
1589                         },
1590                         None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1591                 }
1592         }
1593
1594         fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>), HandleError> {
1595                 let (revoke_and_ack, commitment_signed, chan_monitor) = {
1596                         let mut channel_state = self.channel_state.lock().unwrap();
1597                         match channel_state.by_id.get_mut(&msg.channel_id) {
1598                                 Some(chan) => {
1599                                         if chan.get_their_node_id() != *their_node_id {
1600                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1601                                         }
1602                                         chan.commitment_signed(&msg)?
1603                                 },
1604                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1605                         }
1606                 };
1607                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1608                         unimplemented!();
1609                 }
1610
1611                 Ok((revoke_and_ack, commitment_signed))
1612         }
1613
1614         fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) -> Result<Option<msgs::CommitmentUpdate>, HandleError> {
1615                 let (res, mut pending_forwards, mut pending_failures, chan_monitor) = {
1616                         let mut channel_state = self.channel_state.lock().unwrap();
1617                         match channel_state.by_id.get_mut(&msg.channel_id) {
1618                                 Some(chan) => {
1619                                         if chan.get_their_node_id() != *their_node_id {
1620                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1621                                         }
1622                                         chan.revoke_and_ack(&msg)?
1623                                 },
1624                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1625                         }
1626                 };
1627                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1628                         unimplemented!();
1629                 }
1630                 for failure in pending_failures.drain(..) {
1631                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &failure.0, failure.1);
1632                 }
1633
1634                 let mut forward_event = None;
1635                 if !pending_forwards.is_empty() {
1636                         let mut channel_state = self.channel_state.lock().unwrap();
1637                         if channel_state.forward_htlcs.is_empty() {
1638                                 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));
1639                                 channel_state.next_forward = forward_event.unwrap();
1640                         }
1641                         for forward_info in pending_forwards.drain(..) {
1642                                 match channel_state.forward_htlcs.entry(forward_info.short_channel_id) {
1643                                         hash_map::Entry::Occupied(mut entry) => {
1644                                                 entry.get_mut().push(forward_info);
1645                                         },
1646                                         hash_map::Entry::Vacant(entry) => {
1647                                                 entry.insert(vec!(forward_info));
1648                                         }
1649                                 }
1650                         }
1651                 }
1652                 match forward_event {
1653                         Some(time) => {
1654                                 let mut pending_events = self.pending_events.lock().unwrap();
1655                                 pending_events.push(events::Event::PendingHTLCsForwardable {
1656                                         time_forwardable: time
1657                                 });
1658                         }
1659                         None => {},
1660                 }
1661
1662                 Ok(res)
1663         }
1664
1665         fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) -> Result<(), HandleError> {
1666                 let mut channel_state = self.channel_state.lock().unwrap();
1667                 match channel_state.by_id.get_mut(&msg.channel_id) {
1668                         Some(chan) => {
1669                                 if chan.get_their_node_id() != *their_node_id {
1670                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1671                                 }
1672                                 chan.update_fee(&*self.fee_estimator, &msg)
1673                         },
1674                         None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1675                 }
1676         }
1677
1678         fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) -> Result<(), HandleError> {
1679                 let (chan_announcement, chan_update) = {
1680                         let mut channel_state = self.channel_state.lock().unwrap();
1681                         match channel_state.by_id.get_mut(&msg.channel_id) {
1682                                 Some(chan) => {
1683                                         if chan.get_their_node_id() != *their_node_id {
1684                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1685                                         }
1686                                         if !chan.is_usable() {
1687                                                 return Err(HandleError{err: "Got an announcement_signatures before we were ready for it", msg: None });
1688                                         }
1689
1690                                         let our_node_id = self.get_our_node_id();
1691                                         let (announcement, our_bitcoin_sig) = chan.get_channel_announcement(our_node_id.clone(), self.genesis_hash.clone())?;
1692
1693                                         let were_node_one = announcement.node_id_1 == our_node_id;
1694                                         let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
1695                                         secp_call!(self.secp_ctx.verify(&msghash, &msg.node_signature, if were_node_one { &announcement.node_id_2 } else { &announcement.node_id_1 }));
1696                                         secp_call!(self.secp_ctx.verify(&msghash, &msg.bitcoin_signature, if were_node_one { &announcement.bitcoin_key_2 } else { &announcement.bitcoin_key_1 }));
1697
1698                                         let our_node_sig = secp_call!(self.secp_ctx.sign(&msghash, &self.our_network_key));
1699
1700                                         (msgs::ChannelAnnouncement {
1701                                                 node_signature_1: if were_node_one { our_node_sig } else { msg.node_signature },
1702                                                 node_signature_2: if were_node_one { msg.node_signature } else { our_node_sig },
1703                                                 bitcoin_signature_1: if were_node_one { our_bitcoin_sig } else { msg.bitcoin_signature },
1704                                                 bitcoin_signature_2: if were_node_one { msg.bitcoin_signature } else { our_bitcoin_sig },
1705                                                 contents: announcement,
1706                                         }, self.get_channel_update(chan).unwrap()) // can only fail if we're not in a ready state
1707                                 },
1708                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1709                         }
1710                 };
1711                 let mut pending_events = self.pending_events.lock().unwrap();
1712                 pending_events.push(events::Event::BroadcastChannelAnnouncement { msg: chan_announcement, update_msg: chan_update });
1713                 Ok(())
1714         }
1715
1716         fn peer_disconnected(&self, their_node_id: &PublicKey, no_connection_possible: bool) {
1717                 let mut channel_state_lock = self.channel_state.lock().unwrap();
1718                 let channel_state = channel_state_lock.borrow_parts();
1719                 let short_to_id = channel_state.short_to_id;
1720                 if no_connection_possible {
1721                         channel_state.by_id.retain(move |_, chan| {
1722                                 if chan.get_their_node_id() == *their_node_id {
1723                                         if let Some(short_id) = chan.get_short_channel_id() {
1724                                                 short_to_id.remove(&short_id);
1725                                         }
1726                                         let txn_to_broadcast = chan.force_shutdown();
1727                                         for tx in txn_to_broadcast {
1728                                                 self.tx_broadcaster.broadcast_transaction(&tx);
1729                                         }
1730                                         false
1731                                 } else {
1732                                         true
1733                                 }
1734                         });
1735                 } else {
1736                         for chan in channel_state.by_id {
1737                                 if chan.1.get_their_node_id() == *their_node_id {
1738                                         //TODO: mark channel disabled (and maybe announce such after a timeout). Also
1739                                         //fail and wipe any uncommitted outbound HTLCs as those are considered after
1740                                         //reconnect.
1741                                 }
1742                         }
1743                 }
1744         }
1745 }
1746
1747 #[cfg(test)]
1748 mod tests {
1749         use chain::chaininterface;
1750         use ln::channelmanager::{ChannelManager,OnionKeys};
1751         use ln::router::{Route, RouteHop, Router};
1752         use ln::msgs;
1753         use ln::msgs::{MsgEncodable,ChannelMessageHandler,RoutingMessageHandler};
1754         use util::test_utils;
1755         use util::events::{Event, EventsProvider};
1756
1757         use bitcoin::util::misc::hex_bytes;
1758         use bitcoin::util::hash::Sha256dHash;
1759         use bitcoin::util::uint::Uint256;
1760         use bitcoin::blockdata::block::BlockHeader;
1761         use bitcoin::blockdata::transaction::{Transaction, TxOut};
1762         use bitcoin::network::constants::Network;
1763         use bitcoin::network::serialize::serialize;
1764         use bitcoin::network::serialize::BitcoinHash;
1765
1766         use secp256k1::Secp256k1;
1767         use secp256k1::key::{PublicKey,SecretKey};
1768
1769         use crypto::sha2::Sha256;
1770         use crypto::digest::Digest;
1771
1772         use rand::{thread_rng,Rng};
1773
1774         use std::collections::HashMap;
1775         use std::default::Default;
1776         use std::sync::{Arc, Mutex};
1777         use std::time::Instant;
1778         use std::mem;
1779
1780         fn build_test_onion_keys() -> Vec<OnionKeys> {
1781                 // Keys from BOLT 4, used in both test vector tests
1782                 let secp_ctx = Secp256k1::new();
1783
1784                 let route = Route {
1785                         hops: vec!(
1786                                         RouteHop {
1787                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]).unwrap(),
1788                                                 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
1789                                         },
1790                                         RouteHop {
1791                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("0324653eac434488002cc06bbfb7f10fe18991e35f9fe4302dbea6d2353dc0ab1c").unwrap()[..]).unwrap(),
1792                                                 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
1793                                         },
1794                                         RouteHop {
1795                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("027f31ebc5462c1fdce1b737ecff52d37d75dea43ce11c74d25aa297165faa2007").unwrap()[..]).unwrap(),
1796                                                 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
1797                                         },
1798                                         RouteHop {
1799                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]).unwrap(),
1800                                                 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
1801                                         },
1802                                         RouteHop {
1803                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("02edabbd16b41c8371b92ef2f04c1185b4f03b6dcd52ba9b78d9d7c89c8f221145").unwrap()[..]).unwrap(),
1804                                                 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
1805                                         },
1806                         ),
1807                 };
1808
1809                 let session_priv = SecretKey::from_slice(&secp_ctx, &hex_bytes("4141414141414141414141414141414141414141414141414141414141414141").unwrap()[..]).unwrap();
1810
1811                 let onion_keys = ChannelManager::construct_onion_keys(&secp_ctx, &route, &session_priv).unwrap();
1812                 assert_eq!(onion_keys.len(), route.hops.len());
1813                 onion_keys
1814         }
1815
1816         #[test]
1817         fn onion_vectors() {
1818                 // Packet creation test vectors from BOLT 4
1819                 let onion_keys = build_test_onion_keys();
1820
1821                 assert_eq!(onion_keys[0].shared_secret[..], hex_bytes("53eb63ea8a3fec3b3cd433b85cd62a4b145e1dda09391b348c4e1cd36a03ea66").unwrap()[..]);
1822                 assert_eq!(onion_keys[0].blinding_factor[..], hex_bytes("2ec2e5da605776054187180343287683aa6a51b4b1c04d6dd49c45d8cffb3c36").unwrap()[..]);
1823                 assert_eq!(onion_keys[0].ephemeral_pubkey.serialize()[..], hex_bytes("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]);
1824                 assert_eq!(onion_keys[0].rho, hex_bytes("ce496ec94def95aadd4bec15cdb41a740c9f2b62347c4917325fcc6fb0453986").unwrap()[..]);
1825                 assert_eq!(onion_keys[0].mu, hex_bytes("b57061dc6d0a2b9f261ac410c8b26d64ac5506cbba30267a649c28c179400eba").unwrap()[..]);
1826
1827                 assert_eq!(onion_keys[1].shared_secret[..], hex_bytes("a6519e98832a0b179f62123b3567c106db99ee37bef036e783263602f3488fae").unwrap()[..]);
1828                 assert_eq!(onion_keys[1].blinding_factor[..], hex_bytes("bf66c28bc22e598cfd574a1931a2bafbca09163df2261e6d0056b2610dab938f").unwrap()[..]);
1829                 assert_eq!(onion_keys[1].ephemeral_pubkey.serialize()[..], hex_bytes("028f9438bfbf7feac2e108d677e3a82da596be706cc1cf342b75c7b7e22bf4e6e2").unwrap()[..]);
1830                 assert_eq!(onion_keys[1].rho, hex_bytes("450ffcabc6449094918ebe13d4f03e433d20a3d28a768203337bc40b6e4b2c59").unwrap()[..]);
1831                 assert_eq!(onion_keys[1].mu, hex_bytes("05ed2b4a3fb023c2ff5dd6ed4b9b6ea7383f5cfe9d59c11d121ec2c81ca2eea9").unwrap()[..]);
1832
1833                 assert_eq!(onion_keys[2].shared_secret[..], hex_bytes("3a6b412548762f0dbccce5c7ae7bb8147d1caf9b5471c34120b30bc9c04891cc").unwrap()[..]);
1834                 assert_eq!(onion_keys[2].blinding_factor[..], hex_bytes("a1f2dadd184eb1627049673f18c6325814384facdee5bfd935d9cb031a1698a5").unwrap()[..]);
1835                 assert_eq!(onion_keys[2].ephemeral_pubkey.serialize()[..], hex_bytes("03bfd8225241ea71cd0843db7709f4c222f62ff2d4516fd38b39914ab6b83e0da0").unwrap()[..]);
1836                 assert_eq!(onion_keys[2].rho, hex_bytes("11bf5c4f960239cb37833936aa3d02cea82c0f39fd35f566109c41f9eac8deea").unwrap()[..]);
1837                 assert_eq!(onion_keys[2].mu, hex_bytes("caafe2820fa00eb2eeb78695ae452eba38f5a53ed6d53518c5c6edf76f3f5b78").unwrap()[..]);
1838
1839                 assert_eq!(onion_keys[3].shared_secret[..], hex_bytes("21e13c2d7cfe7e18836df50872466117a295783ab8aab0e7ecc8c725503ad02d").unwrap()[..]);
1840                 assert_eq!(onion_keys[3].blinding_factor[..], hex_bytes("7cfe0b699f35525029ae0fa437c69d0f20f7ed4e3916133f9cacbb13c82ff262").unwrap()[..]);
1841                 assert_eq!(onion_keys[3].ephemeral_pubkey.serialize()[..], hex_bytes("031dde6926381289671300239ea8e57ffaf9bebd05b9a5b95beaf07af05cd43595").unwrap()[..]);
1842                 assert_eq!(onion_keys[3].rho, hex_bytes("cbe784ab745c13ff5cffc2fbe3e84424aa0fd669b8ead4ee562901a4a4e89e9e").unwrap()[..]);
1843                 assert_eq!(onion_keys[3].mu, hex_bytes("5052aa1b3d9f0655a0932e50d42f0c9ba0705142c25d225515c45f47c0036ee9").unwrap()[..]);
1844
1845                 assert_eq!(onion_keys[4].shared_secret[..], hex_bytes("b5756b9b542727dbafc6765a49488b023a725d631af688fc031217e90770c328").unwrap()[..]);
1846                 assert_eq!(onion_keys[4].blinding_factor[..], hex_bytes("c96e00dddaf57e7edcd4fb5954be5b65b09f17cb6d20651b4e90315be5779205").unwrap()[..]);
1847                 assert_eq!(onion_keys[4].ephemeral_pubkey.serialize()[..], hex_bytes("03a214ebd875aab6ddfd77f22c5e7311d7f77f17a169e599f157bbcdae8bf071f4").unwrap()[..]);
1848                 assert_eq!(onion_keys[4].rho, hex_bytes("034e18b8cc718e8af6339106e706c52d8df89e2b1f7e9142d996acf88df8799b").unwrap()[..]);
1849                 assert_eq!(onion_keys[4].mu, hex_bytes("8e45e5c61c2b24cb6382444db6698727afb063adecd72aada233d4bf273d975a").unwrap()[..]);
1850
1851                 // Test vectors below are flat-out wrong: they claim to set outgoing_cltv_value to non-0 :/
1852                 let payloads = vec!(
1853                         msgs::OnionHopData {
1854                                 realm: 0,
1855                                 data: msgs::OnionRealm0HopData {
1856                                         short_channel_id: 0,
1857                                         amt_to_forward: 0,
1858                                         outgoing_cltv_value: 0,
1859                                 },
1860                                 hmac: [0; 32],
1861                         },
1862                         msgs::OnionHopData {
1863                                 realm: 0,
1864                                 data: msgs::OnionRealm0HopData {
1865                                         short_channel_id: 0x0101010101010101,
1866                                         amt_to_forward: 0x0100000001,
1867                                         outgoing_cltv_value: 0,
1868                                 },
1869                                 hmac: [0; 32],
1870                         },
1871                         msgs::OnionHopData {
1872                                 realm: 0,
1873                                 data: msgs::OnionRealm0HopData {
1874                                         short_channel_id: 0x0202020202020202,
1875                                         amt_to_forward: 0x0200000002,
1876                                         outgoing_cltv_value: 0,
1877                                 },
1878                                 hmac: [0; 32],
1879                         },
1880                         msgs::OnionHopData {
1881                                 realm: 0,
1882                                 data: msgs::OnionRealm0HopData {
1883                                         short_channel_id: 0x0303030303030303,
1884                                         amt_to_forward: 0x0300000003,
1885                                         outgoing_cltv_value: 0,
1886                                 },
1887                                 hmac: [0; 32],
1888                         },
1889                         msgs::OnionHopData {
1890                                 realm: 0,
1891                                 data: msgs::OnionRealm0HopData {
1892                                         short_channel_id: 0x0404040404040404,
1893                                         amt_to_forward: 0x0400000004,
1894                                         outgoing_cltv_value: 0,
1895                                 },
1896                                 hmac: [0; 32],
1897                         },
1898                 );
1899
1900                 let packet = ChannelManager::construct_onion_packet(payloads, onion_keys, hex_bytes("4242424242424242424242424242424242424242424242424242424242424242").unwrap()).unwrap();
1901                 // Just check the final packet encoding, as it includes all the per-hop vectors in it
1902                 // anyway...
1903                 assert_eq!(packet.encode(), hex_bytes("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").unwrap());
1904         }
1905
1906         #[test]
1907         fn test_failure_packet_onion() {
1908                 // Returning Errors test vectors from BOLT 4
1909
1910                 let onion_keys = build_test_onion_keys();
1911                 let onion_error = ChannelManager::build_failure_packet(&onion_keys[4].shared_secret, 0x2002, &[0; 0]);
1912                 assert_eq!(onion_error.encode(), hex_bytes("4c2fc8bc08510334b6833ad9c3e79cd1b52ae59dfe5c2a4b23ead50f09f7ee0b0002200200fe0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000").unwrap());
1913
1914                 let onion_packet_1 = ChannelManager::encrypt_failure_packet(&onion_keys[4].shared_secret, &onion_error.encode()[..]);
1915                 assert_eq!(onion_packet_1.data, hex_bytes("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").unwrap());
1916
1917                 let onion_packet_2 = ChannelManager::encrypt_failure_packet(&onion_keys[3].shared_secret, &onion_packet_1.data[..]);
1918                 assert_eq!(onion_packet_2.data, hex_bytes("c49a1ce81680f78f5f2000cda36268de34a3f0a0662f55b4e837c83a8773c22aa081bab1616a0011585323930fa5b9fae0c85770a2279ff59ec427ad1bbff9001c0cd1497004bd2a0f68b50704cf6d6a4bf3c8b6a0833399a24b3456961ba00736785112594f65b6b2d44d9f5ea4e49b5e1ec2af978cbe31c67114440ac51a62081df0ed46d4a3df295da0b0fe25c0115019f03f15ec86fabb4c852f83449e812f141a9395b3f70b766ebbd4ec2fae2b6955bd8f32684c15abfe8fd3a6261e52650e8807a92158d9f1463261a925e4bfba44bd20b166d532f0017185c3a6ac7957adefe45559e3072c8dc35abeba835a8cb01a71a15c736911126f27d46a36168ca5ef7dccd4e2886212602b181463e0dd30185c96348f9743a02aca8ec27c0b90dca270").unwrap());
1919
1920                 let onion_packet_3 = ChannelManager::encrypt_failure_packet(&onion_keys[2].shared_secret, &onion_packet_2.data[..]);
1921                 assert_eq!(onion_packet_3.data, hex_bytes("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").unwrap());
1922
1923                 let onion_packet_4 = ChannelManager::encrypt_failure_packet(&onion_keys[1].shared_secret, &onion_packet_3.data[..]);
1924                 assert_eq!(onion_packet_4.data, hex_bytes("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").unwrap());
1925
1926                 let onion_packet_5 = ChannelManager::encrypt_failure_packet(&onion_keys[0].shared_secret, &onion_packet_4.data[..]);
1927                 assert_eq!(onion_packet_5.data, hex_bytes("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").unwrap());
1928         }
1929
1930         fn confirm_transaction(chain: &chaininterface::ChainWatchInterfaceUtil, tx: &Transaction, chan_id: u32) {
1931                 let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
1932                 chain.block_connected_checked(&header, 1, &[tx; 1], &[chan_id; 1]);
1933                 for i in 2..100 {
1934                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
1935                         chain.block_connected_checked(&header, i, &[tx; 0], &[0; 0]);
1936                 }
1937         }
1938
1939         struct Node {
1940                 feeest: Arc<test_utils::TestFeeEstimator>,
1941                 chain_monitor: Arc<chaininterface::ChainWatchInterfaceUtil>,
1942                 tx_broadcaster: Arc<test_utils::TestBroadcaster>,
1943                 chan_monitor: Arc<test_utils::TestChannelMonitor>,
1944                 node_id: SecretKey,
1945                 node: Arc<ChannelManager>,
1946                 router: Router,
1947         }
1948
1949         static mut CHAN_COUNT: u32 = 0;
1950         fn create_chan_between_nodes(node_a: &Node, node_b: &Node) -> (msgs::ChannelAnnouncement, msgs::ChannelUpdate, msgs::ChannelUpdate, Uint256, Transaction) {
1951                 let open_chan = node_a.node.create_channel(node_b.node.get_our_node_id(), 100000, 42).unwrap();
1952                 let accept_chan = node_b.node.handle_open_channel(&node_a.node.get_our_node_id(), &open_chan).unwrap();
1953                 node_a.node.handle_accept_channel(&node_b.node.get_our_node_id(), &accept_chan).unwrap();
1954
1955                 let chan_id = unsafe { CHAN_COUNT };
1956                 let tx;
1957                 let funding_output;
1958
1959                 let events_1 = node_a.node.get_and_clear_pending_events();
1960                 assert_eq!(events_1.len(), 1);
1961                 match events_1[0] {
1962                         Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, user_channel_id } => {
1963                                 assert_eq!(*channel_value_satoshis, 100000);
1964                                 assert_eq!(user_channel_id, 42);
1965
1966                                 tx = Transaction { version: chan_id as u32, lock_time: 0, input: Vec::new(), output: vec![TxOut {
1967                                         value: *channel_value_satoshis, script_pubkey: output_script.clone(),
1968                                 }]};
1969                                 funding_output = (Sha256dHash::from_data(&serialize(&tx).unwrap()[..]), 0);
1970
1971                                 node_a.node.funding_transaction_generated(&temporary_channel_id, funding_output.clone());
1972                                 let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
1973                                 assert_eq!(added_monitors.len(), 1);
1974                                 assert_eq!(added_monitors[0].0, funding_output);
1975                                 added_monitors.clear();
1976                         },
1977                         _ => panic!("Unexpected event"),
1978                 }
1979
1980                 let events_2 = node_a.node.get_and_clear_pending_events();
1981                 assert_eq!(events_2.len(), 1);
1982                 let funding_signed = match events_2[0] {
1983                         Event::SendFundingCreated { ref node_id, ref msg } => {
1984                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
1985                                 let res = node_b.node.handle_funding_created(&node_a.node.get_our_node_id(), msg).unwrap();
1986                                 let mut added_monitors = node_b.chan_monitor.added_monitors.lock().unwrap();
1987                                 assert_eq!(added_monitors.len(), 1);
1988                                 assert_eq!(added_monitors[0].0, funding_output);
1989                                 added_monitors.clear();
1990                                 res
1991                         },
1992                         _ => panic!("Unexpected event"),
1993                 };
1994
1995                 node_a.node.handle_funding_signed(&node_b.node.get_our_node_id(), &funding_signed).unwrap();
1996                 {
1997                         let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
1998                         assert_eq!(added_monitors.len(), 1);
1999                         assert_eq!(added_monitors[0].0, funding_output);
2000                         added_monitors.clear();
2001                 }
2002
2003                 let events_3 = node_a.node.get_and_clear_pending_events();
2004                 assert_eq!(events_3.len(), 1);
2005                 match events_3[0] {
2006                         Event::FundingBroadcastSafe { ref funding_txo, user_channel_id } => {
2007                                 assert_eq!(user_channel_id, 42);
2008                                 assert_eq!(*funding_txo, funding_output);
2009                         },
2010                         _ => panic!("Unexpected event"),
2011                 };
2012
2013                 confirm_transaction(&node_a.chain_monitor, &tx, chan_id);
2014                 let events_4 = node_a.node.get_and_clear_pending_events();
2015                 assert_eq!(events_4.len(), 1);
2016                 match events_4[0] {
2017                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
2018                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2019                                 assert!(announcement_sigs.is_none());
2020                                 node_b.node.handle_funding_locked(&node_a.node.get_our_node_id(), msg).unwrap()
2021                         },
2022                         _ => panic!("Unexpected event"),
2023                 };
2024
2025                 let channel_id;
2026
2027                 confirm_transaction(&node_b.chain_monitor, &tx, chan_id);
2028                 let events_5 = node_b.node.get_and_clear_pending_events();
2029                 assert_eq!(events_5.len(), 1);
2030                 let as_announcement_sigs = match events_5[0] {
2031                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
2032                                 assert_eq!(*node_id, node_a.node.get_our_node_id());
2033                                 channel_id = msg.channel_id.clone();
2034                                 let as_announcement_sigs = node_a.node.handle_funding_locked(&node_b.node.get_our_node_id(), msg).unwrap().unwrap();
2035                                 node_a.node.handle_announcement_signatures(&node_b.node.get_our_node_id(), &(*announcement_sigs).clone().unwrap()).unwrap();
2036                                 as_announcement_sigs
2037                         },
2038                         _ => panic!("Unexpected event"),
2039                 };
2040
2041                 let events_6 = node_a.node.get_and_clear_pending_events();
2042                 assert_eq!(events_6.len(), 1);
2043                 let (announcement, as_update) = match events_6[0] {
2044                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
2045                                 (msg, update_msg)
2046                         },
2047                         _ => panic!("Unexpected event"),
2048                 };
2049
2050                 node_b.node.handle_announcement_signatures(&node_a.node.get_our_node_id(), &as_announcement_sigs).unwrap();
2051                 let events_7 = node_b.node.get_and_clear_pending_events();
2052                 assert_eq!(events_7.len(), 1);
2053                 let bs_update = match events_7[0] {
2054                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
2055                                 assert!(*announcement == *msg);
2056                                 update_msg
2057                         },
2058                         _ => panic!("Unexpected event"),
2059                 };
2060
2061                 unsafe {
2062                         CHAN_COUNT += 1;
2063                 }
2064
2065                 ((*announcement).clone(), (*as_update).clone(), (*bs_update).clone(), channel_id, tx)
2066         }
2067
2068         fn create_announced_chan_between_nodes(nodes: &Vec<Node>, a: usize, b: usize) -> (msgs::ChannelUpdate, msgs::ChannelUpdate, Uint256, Transaction) {
2069                 let chan_announcement = create_chan_between_nodes(&nodes[a], &nodes[b]);
2070                 for node in nodes {
2071                         assert!(node.router.handle_channel_announcement(&chan_announcement.0).unwrap());
2072                         node.router.handle_channel_update(&chan_announcement.1).unwrap();
2073                         node.router.handle_channel_update(&chan_announcement.2).unwrap();
2074                 }
2075                 (chan_announcement.1, chan_announcement.2, chan_announcement.3, chan_announcement.4)
2076         }
2077
2078         fn close_channel(outbound_node: &Node, inbound_node: &Node, channel_id: &Uint256, funding_tx: Transaction, close_inbound_first: bool) {
2079                 let (node_a, broadcaster_a) = if close_inbound_first { (&inbound_node.node, &inbound_node.tx_broadcaster) } else { (&outbound_node.node, &outbound_node.tx_broadcaster) };
2080                 let (node_b, broadcaster_b) = if close_inbound_first { (&outbound_node.node, &outbound_node.tx_broadcaster) } else { (&inbound_node.node, &inbound_node.tx_broadcaster) };
2081                 let (tx_a, tx_b);
2082
2083                 let shutdown_a = node_a.close_channel(channel_id).unwrap();
2084                 let (shutdown_b, mut closing_signed_b) = node_b.handle_shutdown(&node_a.get_our_node_id(), &shutdown_a).unwrap();
2085                 if !close_inbound_first {
2086                         assert!(closing_signed_b.is_none());
2087                 }
2088                 let (empty_a, mut closing_signed_a) = node_a.handle_shutdown(&node_b.get_our_node_id(), &shutdown_b.unwrap()).unwrap();
2089                 assert!(empty_a.is_none());
2090                 if close_inbound_first {
2091                         assert!(closing_signed_a.is_none());
2092                         closing_signed_a = node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
2093                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
2094                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
2095
2096                         let empty_b = node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
2097                         assert!(empty_b.is_none());
2098                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
2099                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
2100                 } else {
2101                         closing_signed_b = node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
2102                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
2103                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
2104
2105                         let empty_a2 = node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
2106                         assert!(empty_a2.is_none());
2107                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
2108                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
2109                 }
2110                 assert_eq!(tx_a, tx_b);
2111                 let mut funding_tx_map = HashMap::new();
2112                 funding_tx_map.insert(funding_tx.txid(), funding_tx);
2113                 tx_a.verify(&funding_tx_map).unwrap();
2114         }
2115
2116         struct SendEvent {
2117                 node_id: PublicKey,
2118                 msgs: Vec<msgs::UpdateAddHTLC>,
2119                 commitment_msg: msgs::CommitmentSigned,
2120         }
2121         impl SendEvent {
2122                 fn from_event(event: Event) -> SendEvent {
2123                         match event {
2124                                 Event::SendHTLCs { node_id, msgs, commitment_msg } => {
2125                                         SendEvent { node_id: node_id, msgs: msgs, commitment_msg: commitment_msg }
2126                                 },
2127                                 _ => panic!("Unexpected event type!"),
2128                         }
2129                 }
2130         }
2131
2132         static mut PAYMENT_COUNT: u8 = 0;
2133         fn send_along_route(origin_node: &Node, route: Route, expected_route: &[&Node], recv_value: u64) -> ([u8; 32], [u8; 32]) {
2134                 let our_payment_preimage = unsafe { [PAYMENT_COUNT; 32] };
2135                 unsafe { PAYMENT_COUNT += 1 };
2136                 let our_payment_hash = {
2137                         let mut sha = Sha256::new();
2138                         sha.input(&our_payment_preimage[..]);
2139                         let mut ret = [0; 32];
2140                         sha.result(&mut ret);
2141                         ret
2142                 };
2143
2144                 let mut payment_event = {
2145                         let msgs = origin_node.node.send_payment(route, our_payment_hash).unwrap().unwrap();
2146                         {
2147                                 let mut added_monitors = origin_node.chan_monitor.added_monitors.lock().unwrap();
2148                                 assert_eq!(added_monitors.len(), 1);
2149                                 added_monitors.clear();
2150                         }
2151                         SendEvent {
2152                                 node_id: expected_route[0].node.get_our_node_id(),
2153                                 msgs: vec!(msgs.0),
2154                                 commitment_msg: msgs.1,
2155                         }
2156                 };
2157                 let mut prev_node = origin_node;
2158
2159                 for (idx, &node) in expected_route.iter().enumerate() {
2160                         assert_eq!(node.node.get_our_node_id(), payment_event.node_id);
2161
2162                         node.node.handle_update_add_htlc(&prev_node.node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
2163                         {
2164                                 let added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2165                                 assert_eq!(added_monitors.len(), 0);
2166                         }
2167
2168                         let revoke_and_ack = node.node.handle_commitment_signed(&prev_node.node.get_our_node_id(), &payment_event.commitment_msg).unwrap();
2169                         {
2170                                 let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2171                                 assert_eq!(added_monitors.len(), 1);
2172                                 added_monitors.clear();
2173                         }
2174                         assert!(prev_node.node.handle_revoke_and_ack(&node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2175                         let prev_revoke_and_ack = prev_node.node.handle_commitment_signed(&node.node.get_our_node_id(), &revoke_and_ack.1.unwrap()).unwrap();
2176                         {
2177                                 let mut added_monitors = prev_node.chan_monitor.added_monitors.lock().unwrap();
2178                                 assert_eq!(added_monitors.len(), 2);
2179                                 added_monitors.clear();
2180                         }
2181                         assert!(node.node.handle_revoke_and_ack(&prev_node.node.get_our_node_id(), &prev_revoke_and_ack.0).unwrap().is_none());
2182                         assert!(prev_revoke_and_ack.1.is_none());
2183                         {
2184                                 let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2185                                 assert_eq!(added_monitors.len(), 1);
2186                                 added_monitors.clear();
2187                         }
2188
2189                         let events_1 = node.node.get_and_clear_pending_events();
2190                         assert_eq!(events_1.len(), 1);
2191                         match events_1[0] {
2192                                 Event::PendingHTLCsForwardable { .. } => { },
2193                                 _ => panic!("Unexpected event"),
2194                         };
2195
2196                         node.node.channel_state.lock().unwrap().next_forward = Instant::now();
2197                         node.node.process_pending_htlc_forward();
2198
2199                         let mut events_2 = node.node.get_and_clear_pending_events();
2200                         assert_eq!(events_2.len(), 1);
2201                         if idx == expected_route.len() - 1 {
2202                                 match events_2[0] {
2203                                         Event::PaymentReceived { ref payment_hash, amt } => {
2204                                                 assert_eq!(our_payment_hash, *payment_hash);
2205                                                 assert_eq!(amt, recv_value);
2206                                         },
2207                                         _ => panic!("Unexpected event"),
2208                                 }
2209                         } else {
2210                                 {
2211                                         let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2212                                         assert_eq!(added_monitors.len(), 1);
2213                                         added_monitors.clear();
2214                                 }
2215                                 for event in events_2.drain(..) {
2216                                         payment_event = SendEvent::from_event(event);
2217                                 }
2218                                 assert_eq!(payment_event.msgs.len(), 1);
2219                         }
2220
2221                         prev_node = node;
2222                 }
2223
2224                 (our_payment_preimage, our_payment_hash)
2225         }
2226
2227         fn claim_payment(origin_node: &Node, expected_route: &[&Node], our_payment_preimage: [u8; 32]) {
2228                 assert!(expected_route.last().unwrap().node.claim_funds(our_payment_preimage));
2229                 {
2230                         let mut added_monitors = expected_route.last().unwrap().chan_monitor.added_monitors.lock().unwrap();
2231                         assert_eq!(added_monitors.len(), 1);
2232                         added_monitors.clear();
2233                 }
2234
2235                 let mut next_msgs: Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned)> = None;
2236                 macro_rules! update_fulfill_dance {
2237                         ($node: expr, $prev_node: expr, $last_node: expr) => {
2238                                 {
2239                                         $node.node.handle_update_fulfill_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
2240                                         {
2241                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2242                                                 if $last_node {
2243                                                         assert_eq!(added_monitors.len(), 1);
2244                                                 } else {
2245                                                         assert_eq!(added_monitors.len(), 2);
2246                                                         assert!(added_monitors[0].0 != added_monitors[1].0);
2247                                                 }
2248                                                 added_monitors.clear();
2249                                         }
2250                                         let revoke_and_commit = $node.node.handle_commitment_signed(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().1).unwrap();
2251                                         {
2252                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2253                                                 assert_eq!(added_monitors.len(), 1);
2254                                                 added_monitors.clear();
2255                                         }
2256                                         assert!($prev_node.node.handle_revoke_and_ack(&$node.node.get_our_node_id(), &revoke_and_commit.0).unwrap().is_none());
2257                                         let revoke_and_ack = $prev_node.node.handle_commitment_signed(&$node.node.get_our_node_id(), &revoke_and_commit.1.unwrap()).unwrap();
2258                                         assert!(revoke_and_ack.1.is_none());
2259                                         {
2260                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2261                                                 assert_eq!(added_monitors.len(), 2);
2262                                                 added_monitors.clear();
2263                                         }
2264                                         assert!($node.node.handle_revoke_and_ack(&$prev_node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2265                                         {
2266                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2267                                                 assert_eq!(added_monitors.len(), 1);
2268                                                 added_monitors.clear();
2269                                         }
2270                                 }
2271                         }
2272                 }
2273
2274                 let mut expected_next_node = expected_route.last().unwrap().node.get_our_node_id();
2275                 let mut prev_node = expected_route.last().unwrap();
2276                 for node in expected_route.iter().rev() {
2277                         assert_eq!(expected_next_node, node.node.get_our_node_id());
2278                         if next_msgs.is_some() {
2279                                 update_fulfill_dance!(node, prev_node, false);
2280                         }
2281
2282                         let events = node.node.get_and_clear_pending_events();
2283                         assert_eq!(events.len(), 1);
2284                         match events[0] {
2285                                 Event::SendFulfillHTLC { ref node_id, ref msg, ref commitment_msg } => {
2286                                         expected_next_node = node_id.clone();
2287                                         next_msgs = Some((msg.clone(), commitment_msg.clone()));
2288                                 },
2289                                 _ => panic!("Unexpected event"),
2290                         };
2291
2292                         prev_node = node;
2293                 }
2294
2295                 assert_eq!(expected_next_node, origin_node.node.get_our_node_id());
2296                 update_fulfill_dance!(origin_node, expected_route.first().unwrap(), true);
2297
2298                 let events = origin_node.node.get_and_clear_pending_events();
2299                 assert_eq!(events.len(), 1);
2300                 match events[0] {
2301                         Event::PaymentSent { payment_preimage } => {
2302                                 assert_eq!(payment_preimage, our_payment_preimage);
2303                         },
2304                         _ => panic!("Unexpected event"),
2305                 }
2306         }
2307
2308         const TEST_FINAL_CLTV: u32 = 32;
2309
2310         fn route_payment(origin_node: &Node, expected_route: &[&Node], recv_value: u64) -> ([u8; 32], [u8; 32]) {
2311                 let route = origin_node.router.get_route(&expected_route.last().unwrap().node.get_our_node_id(), &Vec::new(), recv_value, TEST_FINAL_CLTV).unwrap();
2312                 assert_eq!(route.hops.len(), expected_route.len());
2313                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
2314                         assert_eq!(hop.pubkey, node.node.get_our_node_id());
2315                 }
2316
2317                 send_along_route(origin_node, route, expected_route, recv_value)
2318         }
2319
2320         fn route_over_limit(origin_node: &Node, expected_route: &[&Node], recv_value: u64) {
2321                 let route = origin_node.router.get_route(&expected_route.last().unwrap().node.get_our_node_id(), &Vec::new(), recv_value, TEST_FINAL_CLTV).unwrap();
2322                 assert_eq!(route.hops.len(), expected_route.len());
2323                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
2324                         assert_eq!(hop.pubkey, node.node.get_our_node_id());
2325                 }
2326
2327                 let our_payment_preimage = unsafe { [PAYMENT_COUNT; 32] };
2328                 unsafe { PAYMENT_COUNT += 1 };
2329                 let our_payment_hash = {
2330                         let mut sha = Sha256::new();
2331                         sha.input(&our_payment_preimage[..]);
2332                         let mut ret = [0; 32];
2333                         sha.result(&mut ret);
2334                         ret
2335                 };
2336
2337                 let err = origin_node.node.send_payment(route, our_payment_hash).err().unwrap();
2338                 assert_eq!(err.err, "Cannot send value that would put us over our max HTLC value in flight");
2339         }
2340
2341         fn send_payment(origin: &Node, expected_route: &[&Node], recv_value: u64) {
2342                 let our_payment_preimage = route_payment(&origin, expected_route, recv_value).0;
2343                 claim_payment(&origin, expected_route, our_payment_preimage);
2344         }
2345
2346         fn fail_payment(origin_node: &Node, expected_route: &[&Node], our_payment_hash: [u8; 32]) {
2347                 assert!(expected_route.last().unwrap().node.fail_htlc_backwards(&our_payment_hash));
2348                 {
2349                         let mut added_monitors = expected_route.last().unwrap().chan_monitor.added_monitors.lock().unwrap();
2350                         assert_eq!(added_monitors.len(), 1);
2351                         added_monitors.clear();
2352                 }
2353
2354                 let mut next_msgs: Option<(msgs::UpdateFailHTLC, msgs::CommitmentSigned)> = None;
2355                 macro_rules! update_fail_dance {
2356                         ($node: expr, $prev_node: expr, $last_node: expr) => {
2357                                 {
2358                                         $node.node.handle_update_fail_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
2359                                         let revoke_and_commit = $node.node.handle_commitment_signed(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().1).unwrap();
2360
2361                                         {
2362                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2363                                                 assert_eq!(added_monitors.len(), 1);
2364                                                 added_monitors.clear();
2365                                         }
2366                                         assert!($prev_node.node.handle_revoke_and_ack(&$node.node.get_our_node_id(), &revoke_and_commit.0).unwrap().is_none());
2367                                         {
2368                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2369                                                 assert_eq!(added_monitors.len(), 1);
2370                                                 added_monitors.clear();
2371                                         }
2372                                         let revoke_and_ack = $prev_node.node.handle_commitment_signed(&$node.node.get_our_node_id(), &revoke_and_commit.1.unwrap()).unwrap();
2373                                         {
2374                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2375                                                 assert_eq!(added_monitors.len(), 1);
2376                                                 added_monitors.clear();
2377                                         }
2378                                         assert!(revoke_and_ack.1.is_none());
2379                                         assert!($node.node.get_and_clear_pending_events().is_empty());
2380                                         assert!($node.node.handle_revoke_and_ack(&$prev_node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2381                                         {
2382                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2383                                                 if $last_node {
2384                                                         assert_eq!(added_monitors.len(), 1);
2385                                                 } else {
2386                                                         assert_eq!(added_monitors.len(), 2);
2387                                                         assert!(added_monitors[0].0 != added_monitors[1].0);
2388                                                 }
2389                                                 added_monitors.clear();
2390                                         }
2391                                 }
2392                         }
2393                 }
2394
2395                 let mut expected_next_node = expected_route.last().unwrap().node.get_our_node_id();
2396                 let mut prev_node = expected_route.last().unwrap();
2397                 for node in expected_route.iter().rev() {
2398                         assert_eq!(expected_next_node, node.node.get_our_node_id());
2399                         if next_msgs.is_some() {
2400                                 update_fail_dance!(node, prev_node, false);
2401                         }
2402
2403                         let events = node.node.get_and_clear_pending_events();
2404                         assert_eq!(events.len(), 1);
2405                         match events[0] {
2406                                 Event::SendFailHTLC { ref node_id, ref msg, ref commitment_msg } => {
2407                                         expected_next_node = node_id.clone();
2408                                         next_msgs = Some((msg.clone(), commitment_msg.clone()));
2409                                 },
2410                                 _ => panic!("Unexpected event"),
2411                         };
2412
2413                         prev_node = node;
2414                 }
2415
2416                 assert_eq!(expected_next_node, origin_node.node.get_our_node_id());
2417                 update_fail_dance!(origin_node, expected_route.first().unwrap(), true);
2418
2419                 let events = origin_node.node.get_and_clear_pending_events();
2420                 assert_eq!(events.len(), 1);
2421                 match events[0] {
2422                         Event::PaymentFailed { payment_hash } => {
2423                                 assert_eq!(payment_hash, our_payment_hash);
2424                         },
2425                         _ => panic!("Unexpected event"),
2426                 }
2427         }
2428
2429         fn create_network(node_count: usize) -> Vec<Node> {
2430                 let mut nodes = Vec::new();
2431                 let mut rng = thread_rng();
2432                 let secp_ctx = Secp256k1::new();
2433
2434                 for _ in 0..node_count {
2435                         let feeest = Arc::new(test_utils::TestFeeEstimator { sat_per_vbyte: 1 });
2436                         let chain_monitor = Arc::new(chaininterface::ChainWatchInterfaceUtil::new());
2437                         let tx_broadcaster = Arc::new(test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new())});
2438                         let chan_monitor = Arc::new(test_utils::TestChannelMonitor::new(chain_monitor.clone(), tx_broadcaster.clone()));
2439                         let node_id = {
2440                                 let mut key_slice = [0; 32];
2441                                 rng.fill_bytes(&mut key_slice);
2442                                 SecretKey::from_slice(&secp_ctx, &key_slice).unwrap()
2443                         };
2444                         let node = ChannelManager::new(node_id.clone(), 0, true, Network::Testnet, feeest.clone(), chan_monitor.clone(), chain_monitor.clone(), tx_broadcaster.clone()).unwrap();
2445                         let router = Router::new(PublicKey::from_secret_key(&secp_ctx, &node_id).unwrap());
2446                         nodes.push(Node { feeest, chain_monitor, tx_broadcaster, chan_monitor, node_id, node, router });
2447                 }
2448
2449                 nodes
2450         }
2451
2452         #[test]
2453         fn fake_network_test() {
2454                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
2455                 // tests that payments get routed and transactions broadcast in semi-reasonable ways.
2456                 let nodes = create_network(4);
2457
2458                 // Create some initial channels
2459                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
2460                 let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2);
2461                 let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3);
2462
2463                 // Rebalance the network a bit by relaying one payment through all the channels...
2464                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2465                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2466                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2467                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2468
2469                 // Send some more payments
2470                 send_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 1000000);
2471                 send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1], &nodes[0])[..], 1000000);
2472                 send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1])[..], 1000000);
2473
2474                 // Test failure packets
2475                 let payment_hash_1 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 1000000).1;
2476                 fail_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], payment_hash_1);
2477
2478                 // Add a new channel that skips 3
2479                 let chan_4 = create_announced_chan_between_nodes(&nodes, 1, 3);
2480
2481                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 1000000);
2482                 send_payment(&nodes[2], &vec!(&nodes[3])[..], 1000000);
2483                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2484                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2485                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2486                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2487                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2488
2489                 // Do some rebalance loop payments, simultaneously
2490                 let mut hops = Vec::with_capacity(3);
2491                 hops.push(RouteHop {
2492                         pubkey: nodes[2].node.get_our_node_id(),
2493                         short_channel_id: chan_2.0.contents.short_channel_id,
2494                         fee_msat: 0,
2495                         cltv_expiry_delta: chan_3.0.contents.cltv_expiry_delta as u32
2496                 });
2497                 hops.push(RouteHop {
2498                         pubkey: nodes[3].node.get_our_node_id(),
2499                         short_channel_id: chan_3.0.contents.short_channel_id,
2500                         fee_msat: 0,
2501                         cltv_expiry_delta: chan_4.1.contents.cltv_expiry_delta as u32
2502                 });
2503                 hops.push(RouteHop {
2504                         pubkey: nodes[1].node.get_our_node_id(),
2505                         short_channel_id: chan_4.0.contents.short_channel_id,
2506                         fee_msat: 1000000,
2507                         cltv_expiry_delta: TEST_FINAL_CLTV,
2508                 });
2509                 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;
2510                 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;
2511                 let payment_preimage_1 = send_along_route(&nodes[1], Route { hops }, &vec!(&nodes[2], &nodes[3], &nodes[1])[..], 1000000).0;
2512
2513                 let mut hops = Vec::with_capacity(3);
2514                 hops.push(RouteHop {
2515                         pubkey: nodes[3].node.get_our_node_id(),
2516                         short_channel_id: chan_4.0.contents.short_channel_id,
2517                         fee_msat: 0,
2518                         cltv_expiry_delta: chan_3.1.contents.cltv_expiry_delta as u32
2519                 });
2520                 hops.push(RouteHop {
2521                         pubkey: nodes[2].node.get_our_node_id(),
2522                         short_channel_id: chan_3.0.contents.short_channel_id,
2523                         fee_msat: 0,
2524                         cltv_expiry_delta: chan_2.1.contents.cltv_expiry_delta as u32
2525                 });
2526                 hops.push(RouteHop {
2527                         pubkey: nodes[1].node.get_our_node_id(),
2528                         short_channel_id: chan_2.0.contents.short_channel_id,
2529                         fee_msat: 1000000,
2530                         cltv_expiry_delta: TEST_FINAL_CLTV,
2531                 });
2532                 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;
2533                 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;
2534                 let payment_hash_2 = send_along_route(&nodes[1], Route { hops }, &vec!(&nodes[3], &nodes[2], &nodes[1])[..], 1000000).1;
2535
2536                 // Claim the rebalances...
2537                 fail_payment(&nodes[1], &vec!(&nodes[3], &nodes[2], &nodes[1])[..], payment_hash_2);
2538                 claim_payment(&nodes[1], &vec!(&nodes[2], &nodes[3], &nodes[1])[..], payment_preimage_1);
2539
2540                 // Add a duplicate new channel from 2 to 4
2541                 let chan_5 = create_announced_chan_between_nodes(&nodes, 1, 3);
2542
2543                 // Send some payments across both channels
2544                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2545                 let payment_preimage_4 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2546                 let payment_preimage_5 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2547
2548                 route_over_limit(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000);
2549
2550                 //TODO: Test that routes work again here as we've been notified that the channel is full
2551
2552                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_3);
2553                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_4);
2554                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_5);
2555
2556                 // Close down the channels...
2557                 close_channel(&nodes[0], &nodes[1], &chan_1.2, chan_1.3, true);
2558                 close_channel(&nodes[1], &nodes[2], &chan_2.2, chan_2.3, false);
2559                 close_channel(&nodes[2], &nodes[3], &chan_3.2, chan_3.3, true);
2560                 close_channel(&nodes[1], &nodes[3], &chan_4.2, chan_4.3, false);
2561                 close_channel(&nodes[1], &nodes[3], &chan_5.2, chan_5.3, false);
2562
2563                 // Check that we processed all pending events
2564                 for node in nodes {
2565                         assert_eq!(node.node.get_and_clear_pending_events().len(), 0);
2566                         assert_eq!(node.chan_monitor.added_monitors.lock().unwrap().len(), 0);
2567                 }
2568         }
2569
2570         #[derive(PartialEq)]
2571         enum HTLCType { NONE, TIMEOUT, SUCCESS }
2572         fn test_txn_broadcast(node: &Node, chan: &(msgs::ChannelUpdate, msgs::ChannelUpdate, Uint256, Transaction), commitment_tx: Option<Transaction>, has_htlc_tx: HTLCType) -> Vec<Transaction> {
2573                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
2574                 assert!(node_txn.len() >= if commitment_tx.is_some() { 0 } else { 1 } + if has_htlc_tx == HTLCType::NONE { 0 } else { 1 });
2575
2576                 let mut res = Vec::with_capacity(2);
2577
2578                 if let Some(explicit_tx) = commitment_tx {
2579                         res.push(explicit_tx.clone());
2580                 } else {
2581                         for tx in node_txn.iter() {
2582                                 if tx.input.len() == 1 && tx.input[0].prev_hash == chan.3.txid() {
2583                                         let mut funding_tx_map = HashMap::new();
2584                                         funding_tx_map.insert(chan.3.txid(), chan.3.clone());
2585                                         tx.verify(&funding_tx_map).unwrap();
2586                                         res.push(tx.clone());
2587                                 }
2588                         }
2589                 }
2590                 assert_eq!(res.len(), 1);
2591
2592                 if has_htlc_tx != HTLCType::NONE {
2593                         for tx in node_txn.iter() {
2594                                 if tx.input.len() == 1 && tx.input[0].prev_hash == res[0].txid() {
2595                                         let mut funding_tx_map = HashMap::new();
2596                                         funding_tx_map.insert(res[0].txid(), res[0].clone());
2597                                         tx.verify(&funding_tx_map).unwrap();
2598                                         if has_htlc_tx == HTLCType::TIMEOUT {
2599                                                 assert!(tx.lock_time != 0);
2600                                         } else {
2601                                                 assert!(tx.lock_time == 0);
2602                                         }
2603                                         res.push(tx.clone());
2604                                         break;
2605                                 }
2606                         }
2607                         assert_eq!(res.len(), 2);
2608                 }
2609                 node_txn.clear();
2610                 res
2611         }
2612
2613         fn check_preimage_claim(node: &Node, prev_txn: &Vec<Transaction>) -> Vec<Transaction> {
2614                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
2615
2616                 assert!(node_txn.len() >= 1);
2617                 assert_eq!(node_txn[0].input.len(), 1);
2618                 let mut found_prev = false;
2619
2620                 for tx in prev_txn {
2621                         if node_txn[0].input[0].prev_hash == tx.txid() {
2622                                 let mut funding_tx_map = HashMap::new();
2623                                 funding_tx_map.insert(tx.txid(), tx.clone());
2624                                 node_txn[0].verify(&funding_tx_map).unwrap();
2625
2626                                 assert!(node_txn[0].input[0].witness[2].len() > 106); // must spend an htlc output
2627                                 assert_eq!(tx.input.len(), 1); // must spend a commitment tx
2628
2629                                 found_prev = true;
2630                                 break;
2631                         }
2632                 }
2633                 assert!(found_prev);
2634
2635                 let mut res = Vec::new();
2636                 mem::swap(&mut *node_txn, &mut res);
2637                 res
2638         }
2639
2640         #[test]
2641         fn channel_monitor_network_test() {
2642                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
2643                 // tests that ChannelMonitor is able to recover from various states.
2644                 let nodes = create_network(5);
2645
2646                 // Create some initial channels
2647                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
2648                 let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2);
2649                 let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3);
2650                 let chan_4 = create_announced_chan_between_nodes(&nodes, 3, 4);
2651
2652                 // Rebalance the network a bit by relaying one payment through all the channels...
2653                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2654                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2655                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2656                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2657
2658                 // Simple case with no pending HTLCs:
2659                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), true);
2660                 {
2661                         let node_txn = test_txn_broadcast(&nodes[1], &chan_1, None, HTLCType::NONE);
2662                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2663                         nodes[0].chain_monitor.block_connected_checked(&header, 1, &[&node_txn[0]; 1], &[4; 1]);
2664                         assert_eq!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().len(), 0);
2665                 }
2666                 assert_eq!(nodes[0].node.list_channels().len(), 0);
2667                 assert_eq!(nodes[1].node.list_channels().len(), 1);
2668
2669                 // One pending HTLC is discarded by the force-close:
2670                 let payment_preimage_1 = route_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 3000000).0;
2671
2672                 // Simple case of one pending HTLC to HTLC-Timeout
2673                 nodes[1].node.peer_disconnected(&nodes[2].node.get_our_node_id(), true);
2674                 {
2675                         let node_txn = test_txn_broadcast(&nodes[1], &chan_2, None, HTLCType::TIMEOUT);
2676                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2677                         nodes[2].chain_monitor.block_connected_checked(&header, 1, &[&node_txn[0]; 1], &[4; 1]);
2678                         assert_eq!(nodes[2].tx_broadcaster.txn_broadcasted.lock().unwrap().len(), 0);
2679                 }
2680                 assert_eq!(nodes[1].node.list_channels().len(), 0);
2681                 assert_eq!(nodes[2].node.list_channels().len(), 1);
2682
2683                 macro_rules! claim_funds {
2684                         ($node: expr, $prev_node: expr, $preimage: expr) => {
2685                                 {
2686                                         assert!($node.node.claim_funds($preimage));
2687                                         {
2688                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2689                                                 assert_eq!(added_monitors.len(), 1);
2690                                                 added_monitors.clear();
2691                                         }
2692
2693                                         let events = $node.node.get_and_clear_pending_events();
2694                                         assert_eq!(events.len(), 1);
2695                                         match events[0] {
2696                                                 Event::SendFulfillHTLC { ref node_id, .. } => {
2697                                                         assert_eq!(*node_id, $prev_node.node.get_our_node_id());
2698                                                 },
2699                                                 _ => panic!("Unexpected event"),
2700                                         };
2701                                 }
2702                         }
2703                 }
2704
2705                 // nodes[3] gets the preimage, but nodes[2] already disconnected, resulting in a nodes[2]
2706                 // HTLC-Timeout and a nodes[3] claim against it (+ its own announces)
2707                 nodes[2].node.peer_disconnected(&nodes[3].node.get_our_node_id(), true);
2708                 {
2709                         let node_txn = test_txn_broadcast(&nodes[2], &chan_3, None, HTLCType::TIMEOUT);
2710
2711                         // Claim the payment on nodes[3], giving it knowledge of the preimage
2712                         claim_funds!(nodes[3], nodes[2], payment_preimage_1);
2713
2714                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2715                         nodes[3].chain_monitor.block_connected_checked(&header, 1, &[&node_txn[0]; 1], &[4; 1]);
2716
2717                         check_preimage_claim(&nodes[3], &node_txn);
2718                 }
2719                 assert_eq!(nodes[2].node.list_channels().len(), 0);
2720                 assert_eq!(nodes[3].node.list_channels().len(), 1);
2721
2722                 // One pending HTLC to time out:
2723                 let payment_preimage_2 = route_payment(&nodes[3], &vec!(&nodes[4])[..], 3000000).0;
2724
2725                 {
2726                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2727                         nodes[3].chain_monitor.block_connected_checked(&header, 1, &Vec::new()[..], &[0; 0]);
2728                         for i in 2..TEST_FINAL_CLTV - 5 {
2729                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2730                                 nodes[3].chain_monitor.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
2731                         }
2732
2733                         let node_txn = test_txn_broadcast(&nodes[3], &chan_4, None, HTLCType::TIMEOUT);
2734
2735                         // Claim the payment on nodes[3], giving it knowledge of the preimage
2736                         claim_funds!(nodes[4], nodes[3], payment_preimage_2);
2737
2738                         header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2739                         nodes[4].chain_monitor.block_connected_checked(&header, 1, &Vec::new()[..], &[0; 0]);
2740                         for i in 2..TEST_FINAL_CLTV - 5 {
2741                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2742                                 nodes[4].chain_monitor.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
2743                         }
2744
2745                         test_txn_broadcast(&nodes[4], &chan_4, None, HTLCType::SUCCESS);
2746
2747                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2748                         nodes[4].chain_monitor.block_connected_checked(&header, TEST_FINAL_CLTV - 5, &[&node_txn[0]; 1], &[4; 1]);
2749
2750                         check_preimage_claim(&nodes[4], &node_txn);
2751                 }
2752                 assert_eq!(nodes[3].node.list_channels().len(), 0);
2753                 assert_eq!(nodes[4].node.list_channels().len(), 0);
2754
2755                 // TODO: Need to reenable this when we fix local route tracking
2756                 // Create some new channels:
2757                 /*let chan_5 = create_announced_chan_between_nodes(&nodes, 0, 1);
2758
2759                 // A pending HTLC which will be revoked:
2760                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
2761                 // Get the will-be-revoked local txn from nodes[0]
2762                 let revoked_local_txn = nodes[0].node.channel_state.lock().unwrap().by_id.iter().next().unwrap().1.last_local_commitment_txn.clone();
2763                 // Revoke the old state
2764                 claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage_3);
2765
2766                 {
2767                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2768                         nodes[1].chain_monitor.block_connected_checked(&header, 1, &vec![&revoked_local_txn[0]; 1], &[4; 1]);
2769                         {
2770                                 let mut node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
2771                                 assert_eq!(node_txn.len(), 1);
2772                                 assert_eq!(node_txn[0].input.len(), 1);
2773
2774                                 let mut funding_tx_map = HashMap::new();
2775                                 funding_tx_map.insert(revoked_local_txn[0].txid(), revoked_local_txn[0].clone());
2776                                 node_txn[0].verify(&funding_tx_map).unwrap();
2777                                 node_txn.clear();
2778                         }
2779
2780                         nodes[0].chain_monitor.block_connected_checked(&header, 1, &vec![&revoked_local_txn[0]; 1], &[4; 0]);
2781                         let node_txn = test_txn_broadcast(&nodes[0], &chan_5, Some(revoked_local_txn[0].clone()), HTLCType::TIMEOUT);
2782                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2783                         nodes[1].chain_monitor.block_connected_checked(&header, 1, &[&node_txn[1]; 1], &[4; 1]);
2784
2785                         //TODO: At this point nodes[1] should claim the revoked HTLC-Timeout output, but that's
2786                         //not yet implemented in ChannelMonitor
2787                 }
2788                 get_announce_close_broadcast_events(&nodes, 0, 1);
2789                 assert_eq!(nodes[0].node.list_channels().len(), 0);
2790                 assert_eq!(nodes[1].node.list_channels().len(), 0);*/
2791
2792                 // Check that we processed all pending events
2793                 for node in nodes {
2794                         assert_eq!(node.node.get_and_clear_pending_events().len(), 0);
2795                         assert_eq!(node.chan_monitor.added_monitors.lock().unwrap().len(), 0);
2796                 }
2797         }
2798 }