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

   1 use bitcoin::blockdata::block::BlockHeader;
   2 use bitcoin::blockdata::transaction::Transaction;
   3 use bitcoin::blockdata::constants::genesis_block;
   4 use bitcoin::network::constants::Network;
   5 use bitcoin::network::serialize::BitcoinHash;
   6 use bitcoin::util::hash::Sha256dHash;
   7
   8 use secp256k1::key::{SecretKey,PublicKey};
   9 use secp256k1::{Secp256k1,Message};
  10 use secp256k1::ecdh::SharedSecret;
  11 use secp256k1;
  12
  13 use chain::chaininterface::{BroadcasterInterface,ChainListener,ChainWatchInterface,FeeEstimator};
  14 use chain::transaction::OutPoint;
  15 use ln::channel::{Channel, ChannelKeys};
  16 use ln::channelmonitor::ManyChannelMonitor;
  17 use ln::router::{Route,RouteHop};
  18 use ln::msgs;
  19 use ln::msgs::{HandleError,ChannelMessageHandler,MsgEncodable,MsgDecodable};
  20 use util::{byte_utils, events, internal_traits, rng};
  21 use util::sha2::Sha256;
  22
  23 use crypto;
  24 use crypto::mac::{Mac,MacResult};
  25 use crypto::hmac::Hmac;
  26 use crypto::digest::Digest;
  27 use crypto::symmetriccipher::SynchronousStreamCipher;
  28 use crypto::chacha20::ChaCha20;
  29
  30 use std::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<[u8; 32], Channel>,
 114         short_to_id: HashMap<u64, [u8; 32]>,
 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<[u8; 32], Channel>,
 122         short_to_id: &'a mut HashMap<u64, [u8; 32]>,
 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", action: 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: [u8; 32],
 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 >= `MAX_FUNDING_SATOSHIS`!
 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         /// Creates a new outbound channel to the given remote node and with the given value.
 236         /// user_id will be provided back as user_channel_id in FundingGenerationReady and
 237         /// FundingBroadcastSafe events to allow tracking of which events correspond with which
 238         /// create_channel call. Note that user_channel_id defaults to 0 for inbound channels, so you
 239         /// may wish to avoid using 0 for user_id here.
 240         /// If successful, will generate a SendOpenChannel event, so you should probably poll
 241         /// PeerManager::process_events afterwards.
 242         pub fn create_channel(&self, their_network_key: PublicKey, channel_value_satoshis: u64, user_id: u64) -> Result<(), HandleError> {
 243                 let chan_keys = if cfg!(feature = "fuzztarget") {
 244                         ChannelKeys {
 245                                 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(),
 246                                 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(),
 247                                 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(),
 248                                 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(),
 249                                 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(),
 250                                 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(),
 251                                 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(),
 252                                 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],
 253                         }
 254                 } else {
 255                         let mut key_seed = [0u8; 32];
 256                         rng::fill_bytes(&mut key_seed);
 257                         match ChannelKeys::new_from_seed(&key_seed) {
 258                                 Ok(key) => key,
 259                                 Err(_) => panic!("RNG is busted!")
 260                         }
 261                 };
 262
 263                 let channel = Channel::new_outbound(&*self.fee_estimator, chan_keys, their_network_key, channel_value_satoshis, self.announce_channels_publicly, user_id);
 264                 let res = channel.get_open_channel(self.genesis_hash.clone(), &*self.fee_estimator)?;
 265                 let mut channel_state = self.channel_state.lock().unwrap();
 266                 match channel_state.by_id.insert(channel.channel_id(), channel) {
 267                         Some(_) => panic!("RNG is bad???"),
 268                         None => {}
 269                 }
 270
 271                 let mut events = self.pending_events.lock().unwrap();
 272                 events.push(events::Event::SendOpenChannel {
 273                         node_id: their_network_key,
 274                         msg: res,
 275                 });
 276                 Ok(())
 277         }
 278
 279         /// Gets the list of open channels, in random order. See ChannelDetail field documentation for
 280         /// more information.
 281         pub fn list_channels(&self) -> Vec<ChannelDetails> {
 282                 let channel_state = self.channel_state.lock().unwrap();
 283                 let mut res = Vec::with_capacity(channel_state.by_id.len());
 284                 for (channel_id, channel) in channel_state.by_id.iter() {
 285                         res.push(ChannelDetails {
 286                                 channel_id: (*channel_id).clone(),
 287                                 short_channel_id: channel.get_short_channel_id(),
 288                                 remote_network_id: channel.get_their_node_id(),
 289                                 channel_value_satoshis: channel.get_value_satoshis(),
 290                                 user_id: channel.get_user_id(),
 291                         });
 292                 }
 293                 res
 294         }
 295
 296         /// Begins the process of closing a channel. After this call (plus some timeout), no new HTLCs
 297         /// will be accepted on the given channel, and after additional timeout/the closing of all
 298         /// pending HTLCs, the channel will be closed on chain.
 299         pub fn close_channel(&self, channel_id: &[u8; 32]) -> Result<msgs::Shutdown, HandleError> {
 300                 let (res, chan_option) = {
 301                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 302                         let channel_state = channel_state_lock.borrow_parts();
 303                         match channel_state.by_id.entry(channel_id.clone()) {
 304                                 hash_map::Entry::Occupied(mut chan_entry) => {
 305                                         let res = chan_entry.get_mut().get_shutdown()?;
 306                                         if chan_entry.get().is_shutdown() {
 307                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
 308                                                         channel_state.short_to_id.remove(&short_id);
 309                                                 }
 310                                                 (res, Some(chan_entry.remove_entry().1))
 311                                         } else { (res, None) }
 312                                 },
 313                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "No such channel", action: None})
 314                         }
 315                 };
 316                 for payment_hash in res.1 {
 317                         // unknown_next_peer...I dunno who that is anymore....
 318                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
 319                 }
 320                 if let Some(chan) = chan_option {
 321                         if let Ok(update) = self.get_channel_update(&chan) {
 322                                 let mut events = self.pending_events.lock().unwrap();
 323                                 events.push(events::Event::BroadcastChannelUpdate {
 324                                         msg: update
 325                                 });
 326                         }
 327                 }
 328                 Ok(res.0)
 329         }
 330
 331         #[inline]
 332         fn gen_rho_mu_from_shared_secret(shared_secret: &SharedSecret) -> ([u8; 32], [u8; 32]) {
 333                 ({
 334                         let mut hmac = Hmac::new(Sha256::new(), &[0x72, 0x68, 0x6f]); // rho
 335                         hmac.input(&shared_secret[..]);
 336                         let mut res = [0; 32];
 337                         hmac.raw_result(&mut res);
 338                         res
 339                 },
 340                 {
 341                         let mut hmac = Hmac::new(Sha256::new(), &[0x6d, 0x75]); // mu
 342                         hmac.input(&shared_secret[..]);
 343                         let mut res = [0; 32];
 344                         hmac.raw_result(&mut res);
 345                         res
 346                 })
 347         }
 348
 349         #[inline]
 350         fn gen_um_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 351                 let mut hmac = Hmac::new(Sha256::new(), &[0x75, 0x6d]); // um
 352                 hmac.input(&shared_secret[..]);
 353                 let mut res = [0; 32];
 354                 hmac.raw_result(&mut res);
 355                 res
 356         }
 357
 358         #[inline]
 359         fn gen_ammag_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 360                 let mut hmac = Hmac::new(Sha256::new(), &[0x61, 0x6d, 0x6d, 0x61, 0x67]); // ammag
 361                 hmac.input(&shared_secret[..]);
 362                 let mut res = [0; 32];
 363                 hmac.raw_result(&mut res);
 364                 res
 365         }
 366
 367         // can only fail if an intermediary hop has an invalid public key or session_priv is invalid
 368         #[inline]
 369         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> {
 370                 let mut blinded_priv = session_priv.clone();
 371                 let mut blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 372                 let mut first_iteration = true;
 373
 374                 for hop in route.hops.iter() {
 375                         let shared_secret = SharedSecret::new(secp_ctx, &hop.pubkey, &blinded_priv);
 376
 377                         let mut sha = Sha256::new();
 378                         sha.input(&blinded_pub.serialize()[..]);
 379                         sha.input(&shared_secret[..]);
 380                         let mut blinding_factor = [0u8; 32];
 381                         sha.result(&mut blinding_factor);
 382
 383                         if first_iteration {
 384                                 blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 385                                 first_iteration = false;
 386                         }
 387                         let ephemeral_pubkey = blinded_pub;
 388
 389                         secp_call!(blinded_priv.mul_assign(secp_ctx, &secp_call!(SecretKey::from_slice(secp_ctx, &blinding_factor))));
 390                         blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 391
 392                         callback(shared_secret, blinding_factor, ephemeral_pubkey, hop);
 393                 }
 394
 395                 Ok(())
 396         }
 397
 398         // can only fail if an intermediary hop has an invalid public key or session_priv is invalid
 399         fn construct_onion_keys(secp_ctx: &Secp256k1, route: &Route, session_priv: &SecretKey) -> Result<Vec<OnionKeys>, HandleError> {
 400                 let mut res = Vec::with_capacity(route.hops.len());
 401
 402                 Self::construct_onion_keys_callback(secp_ctx, route, session_priv, |shared_secret, _blinding_factor, ephemeral_pubkey, _| {
 403                         let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
 404
 405                         res.push(OnionKeys {
 406                                 #[cfg(test)]
 407                                 shared_secret,
 408                                 #[cfg(test)]
 409                                 blinding_factor: _blinding_factor,
 410                                 ephemeral_pubkey,
 411                                 rho,
 412                                 mu,
 413                         });
 414                 })?;
 415
 416                 Ok(res)
 417         }
 418
 419         /// returns the hop data, as well as the first-hop value_msat and CLTV value we should send.
 420         fn build_onion_payloads(route: &Route) -> Result<(Vec<msgs::OnionHopData>, u64, u32), HandleError> {
 421                 let mut cur_value_msat = 0u64;
 422                 let mut cur_cltv = 0u32;
 423                 let mut last_short_channel_id = 0;
 424                 let mut res: Vec<msgs::OnionHopData> = Vec::with_capacity(route.hops.len());
 425                 internal_traits::test_no_dealloc::<msgs::OnionHopData>(None);
 426                 unsafe { res.set_len(route.hops.len()); }
 427
 428                 for (idx, hop) in route.hops.iter().enumerate().rev() {
 429                         // First hop gets special values so that it can check, on receipt, that everything is
 430                         // exactly as it should be (and the next hop isn't trying to probe to find out if we're
 431                         // the intended recipient).
 432                         let value_msat = if cur_value_msat == 0 { hop.fee_msat } else { cur_value_msat };
 433                         let cltv = if cur_cltv == 0 { hop.cltv_expiry_delta } else { cur_cltv };
 434                         res[idx] = msgs::OnionHopData {
 435                                 realm: 0,
 436                                 data: msgs::OnionRealm0HopData {
 437                                         short_channel_id: last_short_channel_id,
 438                                         amt_to_forward: value_msat,
 439                                         outgoing_cltv_value: cltv,
 440                                 },
 441                                 hmac: [0; 32],
 442                         };
 443                         cur_value_msat += hop.fee_msat;
 444                         if cur_value_msat >= 21000000 * 100000000 * 1000 {
 445                                 return Err(HandleError{err: "Channel fees overflowed?!", action: None});
 446                         }
 447                         cur_cltv += hop.cltv_expiry_delta as u32;
 448                         if cur_cltv >= 500000000 {
 449                                 return Err(HandleError{err: "Channel CLTV overflowed?!", action: None});
 450                         }
 451                         last_short_channel_id = hop.short_channel_id;
 452                 }
 453                 Ok((res, cur_value_msat, cur_cltv))
 454         }
 455
 456         #[inline]
 457         fn shift_arr_right(arr: &mut [u8; 20*65]) {
 458                 unsafe {
 459                         ptr::copy(arr[0..].as_ptr(), arr[65..].as_mut_ptr(), 19*65);
 460                 }
 461                 for i in 0..65 {
 462                         arr[i] = 0;
 463                 }
 464         }
 465
 466         #[inline]
 467         fn xor_bufs(dst: &mut[u8], src: &[u8]) {
 468                 assert_eq!(dst.len(), src.len());
 469
 470                 for i in 0..dst.len() {
 471                         dst[i] ^= src[i];
 472                 }
 473         }
 474
 475         const ZERO:[u8; 21*65] = [0; 21*65];
 476         fn construct_onion_packet(mut payloads: Vec<msgs::OnionHopData>, onion_keys: Vec<OnionKeys>, associated_data: Vec<u8>) -> Result<msgs::OnionPacket, HandleError> {
 477                 let mut buf = Vec::with_capacity(21*65);
 478                 buf.resize(21*65, 0);
 479
 480                 let filler = {
 481                         let iters = payloads.len() - 1;
 482                         let end_len = iters * 65;
 483                         let mut res = Vec::with_capacity(end_len);
 484                         res.resize(end_len, 0);
 485
 486                         for (i, keys) in onion_keys.iter().enumerate() {
 487                                 if i == payloads.len() - 1 { continue; }
 488                                 let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 489                                 chacha.process(&ChannelManager::ZERO, &mut buf); // We don't have a seek function :(
 490                                 ChannelManager::xor_bufs(&mut res[0..(i + 1)*65], &buf[(20 - i)*65..21*65]);
 491                         }
 492                         res
 493                 };
 494
 495                 let mut packet_data = [0; 20*65];
 496                 let mut hmac_res = [0; 32];
 497
 498                 for (i, (payload, keys)) in payloads.iter_mut().zip(onion_keys.iter()).rev().enumerate() {
 499                         ChannelManager::shift_arr_right(&mut packet_data);
 500                         payload.hmac = hmac_res;
 501                         packet_data[0..65].copy_from_slice(&payload.encode()[..]);
 502
 503                         let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 504                         chacha.process(&packet_data, &mut buf[0..20*65]);
 505                         packet_data[..].copy_from_slice(&buf[0..20*65]);
 506
 507                         if i == 0 {
 508                                 packet_data[20*65 - filler.len()..20*65].copy_from_slice(&filler[..]);
 509                         }
 510
 511                         let mut hmac = Hmac::new(Sha256::new(), &keys.mu);
 512                         hmac.input(&packet_data);
 513                         hmac.input(&associated_data[..]);
 514                         hmac.raw_result(&mut hmac_res);
 515                 }
 516
 517                 Ok(msgs::OnionPacket{
 518                         version: 0,
 519                         public_key: onion_keys.first().unwrap().ephemeral_pubkey,
 520                         hop_data: packet_data,
 521                         hmac: hmac_res,
 522                 })
 523         }
 524
 525         /// Encrypts a failure packet. raw_packet can either be a
 526         /// msgs::DecodedOnionErrorPacket.encode() result or a msgs::OnionErrorPacket.data element.
 527         fn encrypt_failure_packet(shared_secret: &SharedSecret, raw_packet: &[u8]) -> msgs::OnionErrorPacket {
 528                 let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
 529
 530                 let mut packet_crypted = Vec::with_capacity(raw_packet.len());
 531                 packet_crypted.resize(raw_packet.len(), 0);
 532                 let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
 533                 chacha.process(&raw_packet, &mut packet_crypted[..]);
 534                 msgs::OnionErrorPacket {
 535                         data: packet_crypted,
 536                 }
 537         }
 538
 539         fn build_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::DecodedOnionErrorPacket {
 540                 assert!(failure_data.len() <= 256 - 2);
 541
 542                 let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
 543
 544                 let failuremsg = {
 545                         let mut res = Vec::with_capacity(2 + failure_data.len());
 546                         res.push(((failure_type >> 8) & 0xff) as u8);
 547                         res.push(((failure_type >> 0) & 0xff) as u8);
 548                         res.extend_from_slice(&failure_data[..]);
 549                         res
 550                 };
 551                 let pad = {
 552                         let mut res = Vec::with_capacity(256 - 2 - failure_data.len());
 553                         res.resize(256 - 2 - failure_data.len(), 0);
 554                         res
 555                 };
 556                 let mut packet = msgs::DecodedOnionErrorPacket {
 557                         hmac: [0; 32],
 558                         failuremsg: failuremsg,
 559                         pad: pad,
 560                 };
 561
 562                 let mut hmac = Hmac::new(Sha256::new(), &um);
 563                 hmac.input(&packet.encode()[32..]);
 564                 hmac.raw_result(&mut packet.hmac);
 565
 566                 packet
 567         }
 568
 569         #[inline]
 570         fn build_first_hop_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::OnionErrorPacket {
 571                 let failure_packet = ChannelManager::build_failure_packet(shared_secret, failure_type, failure_data);
 572                 ChannelManager::encrypt_failure_packet(shared_secret, &failure_packet.encode()[..])
 573         }
 574
 575         /// only fails if the channel does not yet have an assigned short_id
 576         fn get_channel_update(&self, chan: &Channel) -> Result<msgs::ChannelUpdate, HandleError> {
 577                 let short_channel_id = match chan.get_short_channel_id() {
 578                         None => return Err(HandleError{err: "Channel not yet established", action: None}),
 579                         Some(id) => id,
 580                 };
 581
 582                 let were_node_one = PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).unwrap().serialize()[..] < chan.get_their_node_id().serialize()[..];
 583
 584                 let unsigned = msgs::UnsignedChannelUpdate {
 585                         chain_hash: self.genesis_hash,
 586                         short_channel_id: short_channel_id,
 587                         timestamp: chan.get_channel_update_count(),
 588                         flags: (!were_node_one) as u16 | ((!chan.is_live() as u16) << 1),
 589                         cltv_expiry_delta: CLTV_EXPIRY_DELTA,
 590                         htlc_minimum_msat: chan.get_our_htlc_minimum_msat(),
 591                         fee_base_msat: chan.get_our_fee_base_msat(&*self.fee_estimator),
 592                         fee_proportional_millionths: self.fee_proportional_millionths,
 593                 };
 594
 595                 let msg_hash = Sha256dHash::from_data(&unsigned.encode()[..]);
 596                 let sig = self.secp_ctx.sign(&Message::from_slice(&msg_hash[..]).unwrap(), &self.our_network_key).unwrap(); //TODO Can we unwrap here?
 597
 598                 Ok(msgs::ChannelUpdate {
 599                         signature: sig,
 600                         contents: unsigned
 601                 })
 602         }
 603
 604         /// Sends a payment along a given route.
 605         /// Value parameters are provided via the last hop in route, see documentation for RouteHop
 606         /// fields for more info.
 607         /// See-also docs on Channel::send_htlc_and_commit.
 608         /// May generate a SendHTLCs event on success, which should be relayed.
 609         pub fn send_payment(&self, route: Route, payment_hash: [u8; 32]) -> Result<(), HandleError> {
 610                 if route.hops.len() < 1 || route.hops.len() > 20 {
 611                         return Err(HandleError{err: "Route didn't go anywhere/had bogus size", action: None});
 612                 }
 613                 let our_node_id = self.get_our_node_id();
 614                 for (idx, hop) in route.hops.iter().enumerate() {
 615                         if idx != route.hops.len() - 1 && hop.pubkey == our_node_id {
 616                                 return Err(HandleError{err: "Route went through us but wasn't a simple rebalance loop to us", action: None});
 617                         }
 618                 }
 619
 620                 let session_priv = secp_call!(SecretKey::from_slice(&self.secp_ctx, &{
 621                         let mut session_key = [0; 32];
 622                         rng::fill_bytes(&mut session_key);
 623                         session_key
 624                 }));
 625
 626                 let associated_data = Vec::new(); //TODO: What to put here?
 627
 628                 let onion_keys = ChannelManager::construct_onion_keys(&self.secp_ctx, &route, &session_priv)?;
 629                 let (onion_payloads, htlc_msat, htlc_cltv) = ChannelManager::build_onion_payloads(&route)?;
 630                 let onion_packet = ChannelManager::construct_onion_packet(onion_payloads, onion_keys, associated_data)?;
 631
 632                 let (first_hop_node_id, (update_add, commitment_signed, chan_monitor)) = {
 633                         let mut channel_state = self.channel_state.lock().unwrap();
 634                         let id = match channel_state.short_to_id.get(&route.hops.first().unwrap().short_channel_id) {
 635                                 None => return Err(HandleError{err: "No channel available with first hop!", action: None}),
 636                                 Some(id) => id.clone()
 637                         };
 638                         let res = {
 639                                 let chan = channel_state.by_id.get_mut(&id).unwrap();
 640                                 if chan.get_their_node_id() != route.hops.first().unwrap().pubkey {
 641                                         return Err(HandleError{err: "Node ID mismatch on first hop!", action: None});
 642                                 }
 643                                 chan.send_htlc_and_commit(htlc_msat, payment_hash.clone(), htlc_cltv, onion_packet)?
 644                         };
 645
 646                         let first_hop_node_id = route.hops.first().unwrap().pubkey;
 647
 648                         if channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::OutboundRoute {
 649                                 route,
 650                                 session_priv,
 651                         }).is_some() {
 652                                 // TODO: We need to track these better, we're not generating these, so a
 653                                 // third-party might make this happen:
 654                                 panic!("payment_hash was repeated! Don't let this happen");
 655                         }
 656
 657                         match res {
 658                                 Some(msgs) => (first_hop_node_id, msgs),
 659                                 None => return Ok(()),
 660                         }
 661                 };
 662
 663                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 664                         unimplemented!(); // maybe remove from claimable_htlcs?
 665                 }
 666
 667                 let mut events = self.pending_events.lock().unwrap();
 668                 events.push(events::Event::SendHTLCs {
 669                         node_id: first_hop_node_id,
 670                         msgs: vec![update_add],
 671                         commitment_msg: commitment_signed,
 672                 });
 673                 Ok(())
 674         }
 675
 676         /// Call this upon creation of a funding transaction for the given channel.
 677         /// Panics if a funding transaction has already been provided for this channel.
 678         pub fn funding_transaction_generated(&self, temporary_channel_id: &[u8; 32], funding_txo: OutPoint) {
 679                 let (chan, msg, chan_monitor) = {
 680                         let mut channel_state = self.channel_state.lock().unwrap();
 681                         match channel_state.by_id.remove(temporary_channel_id) {
 682                                 Some(mut chan) => {
 683                                         match chan.get_outbound_funding_created(funding_txo) {
 684                                                 Ok(funding_msg) => {
 685                                                         (chan, funding_msg.0, funding_msg.1)
 686                                                 },
 687                                                 Err(_e) => {
 688                                                         //TODO: Push e to pendingevents
 689                                                         return;
 690                                                 }
 691                                         }
 692                                 },
 693                                 None => return
 694                         }
 695                 }; // Release channel lock for install_watch_outpoint call,
 696                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 697                         unimplemented!(); // maybe remove from claimable_htlcs?
 698                 }
 699                 {
 700                         let mut pending_events = self.pending_events.lock().unwrap();
 701                         pending_events.push(events::Event::SendFundingCreated {
 702                                 node_id: chan.get_their_node_id(),
 703                                 msg: msg,
 704                         });
 705                 }
 706
 707                 let mut channel_state = self.channel_state.lock().unwrap();
 708                 channel_state.by_id.insert(chan.channel_id(), chan);
 709         }
 710
 711         fn get_announcement_sigs(&self, chan: &Channel) -> Result<Option<msgs::AnnouncementSignatures>, HandleError> {
 712                 if !chan.is_usable() || !chan.should_announce() { return Ok(None) }
 713
 714                 let (announcement, our_bitcoin_sig) = chan.get_channel_announcement(self.get_our_node_id(), self.genesis_hash.clone())?;
 715                 let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
 716                 let our_node_sig = secp_call!(self.secp_ctx.sign(&msghash, &self.our_network_key));
 717
 718                 Ok(Some(msgs::AnnouncementSignatures {
 719                         channel_id: chan.channel_id(),
 720                         short_channel_id: chan.get_short_channel_id().unwrap(),
 721                         node_signature: our_node_sig,
 722                         bitcoin_signature: our_bitcoin_sig,
 723                 }))
 724         }
 725
 726         pub fn process_pending_htlc_forward(&self) {
 727                 let mut new_events = Vec::new();
 728                 let mut failed_forwards = Vec::new();
 729                 {
 730                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 731                         let channel_state = channel_state_lock.borrow_parts();
 732
 733                         if cfg!(not(feature = "fuzztarget")) && Instant::now() < *channel_state.next_forward {
 734                                 return;
 735                         }
 736
 737                         for (short_chan_id, pending_forwards) in channel_state.forward_htlcs.drain() {
 738                                 if short_chan_id != 0 {
 739                                         let forward_chan_id = match channel_state.short_to_id.get(&short_chan_id) {
 740                                                 Some(chan_id) => chan_id.clone(),
 741                                                 None => {
 742                                                         failed_forwards.reserve(pending_forwards.len());
 743                                                         for forward_info in pending_forwards {
 744                                                                 failed_forwards.push((forward_info.payment_hash, 0x4000 | 10, None));
 745                                                         }
 746                                                         continue;
 747                                                 }
 748                                         };
 749                                         let forward_chan = &mut channel_state.by_id.get_mut(&forward_chan_id).unwrap();
 750
 751                                         let mut add_htlc_msgs = Vec::new();
 752                                         for forward_info in pending_forwards {
 753                                                 match forward_chan.send_htlc(forward_info.amt_to_forward, forward_info.payment_hash, forward_info.outgoing_cltv_value, forward_info.onion_packet.unwrap()) {
 754                                                         Err(_e) => {
 755                                                                 let chan_update = self.get_channel_update(forward_chan).unwrap();
 756                                                                 failed_forwards.push((forward_info.payment_hash, 0x1000 | 7, Some(chan_update)));
 757                                                                 continue;
 758                                                         },
 759                                                         Ok(update_add) => {
 760                                                                 match update_add {
 761                                                                         Some(msg) => { add_htlc_msgs.push(msg); },
 762                                                                         None => {
 763                                                                                 // Nothing to do here...we're waiting on a remote
 764                                                                                 // revoke_and_ack before we can add anymore HTLCs. The Channel
 765                                                                                 // will automatically handle building the update_add_htlc and
 766                                                                                 // commitment_signed messages when we can.
 767                                                                                 // TODO: Do some kind of timer to set the channel as !is_live()
 768                                                                                 // as we don't really want others relying on us relaying through
 769                                                                                 // this channel currently :/.
 770                                                                         }
 771                                                                 }
 772                                                         }
 773                                                 }
 774                                         }
 775
 776                                         if !add_htlc_msgs.is_empty() {
 777                                                 let (commitment_msg, monitor) = match forward_chan.send_commitment() {
 778                                                         Ok(res) => res,
 779                                                         Err(_) => {
 780                                                                 //TODO: Handle...this is bad!
 781                                                                 continue;
 782                                                         },
 783                                                 };
 784                                                 new_events.push((Some(monitor), events::Event::SendHTLCs {
 785                                                         node_id: forward_chan.get_their_node_id(),
 786                                                         msgs: add_htlc_msgs,
 787                                                         commitment_msg: commitment_msg,
 788                                                 }));
 789                                         }
 790                                 } else {
 791                                         for forward_info in pending_forwards {
 792                                                 new_events.push((None, events::Event::PaymentReceived {
 793                                                         payment_hash: forward_info.payment_hash,
 794                                                         amt: forward_info.amt_to_forward,
 795                                                 }));
 796                                         }
 797                                 }
 798                         }
 799                 }
 800
 801                 for failed_forward in failed_forwards.drain(..) {
 802                         match failed_forward.2 {
 803                                 None => self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &failed_forward.0, HTLCFailReason::Reason { failure_code: failed_forward.1, data: Vec::new() }),
 804                                 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() }),
 805                         };
 806                 }
 807
 808                 if new_events.is_empty() { return }
 809
 810                 new_events.retain(|event| {
 811                         if let &Some(ref monitor) = &event.0 {
 812                                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor.clone()) {
 813                                         unimplemented!();// but def dont push the event...
 814                                 }
 815                         }
 816                         true
 817                 });
 818
 819                 let mut events = self.pending_events.lock().unwrap();
 820                 events.reserve(new_events.len());
 821                 for event in new_events.drain(..) {
 822                         events.push(event.1);
 823                 }
 824         }
 825
 826         /// Indicates that the preimage for payment_hash is unknown after a PaymentReceived event.
 827         pub fn fail_htlc_backwards(&self, payment_hash: &[u8; 32]) -> bool {
 828                 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 15, data: Vec::new() })
 829         }
 830
 831         fn fail_htlc_backwards_internal(&self, mut channel_state: MutexGuard<ChannelHolder>, payment_hash: &[u8; 32], onion_error: HTLCFailReason) -> bool {
 832                 let mut pending_htlc = {
 833                         match channel_state.claimable_htlcs.remove(payment_hash) {
 834                                 Some(pending_htlc) => pending_htlc,
 835                                 None => return false,
 836                         }
 837                 };
 838
 839                 match pending_htlc {
 840                         PendingOutboundHTLC::CycledRoute { source_short_channel_id, incoming_packet_shared_secret, route, session_priv } => {
 841                                 channel_state.claimable_htlcs.insert(payment_hash.clone(), PendingOutboundHTLC::OutboundRoute {
 842                                         route,
 843                                         session_priv,
 844                                 });
 845                                 pending_htlc = PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret };
 846                         },
 847                         _ => {}
 848                 }
 849
 850                 match pending_htlc {
 851                         PendingOutboundHTLC::CycledRoute { .. } => { panic!("WAT"); },
 852                         PendingOutboundHTLC::OutboundRoute { .. } => {
 853                                 mem::drop(channel_state);
 854
 855                                 let mut pending_events = self.pending_events.lock().unwrap();
 856                                 pending_events.push(events::Event::PaymentFailed {
 857                                         payment_hash: payment_hash.clone()
 858                                 });
 859                                 false
 860                         },
 861                         PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret } => {
 862                                 let err_packet = match onion_error {
 863                                         HTLCFailReason::Reason { failure_code, data } => {
 864                                                 let packet = ChannelManager::build_failure_packet(&incoming_packet_shared_secret, failure_code, &data[..]).encode();
 865                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &packet)
 866                                         },
 867                                         HTLCFailReason::ErrorPacket { err } => {
 868                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &err.data)
 869                                         }
 870                                 };
 871
 872                                 let (node_id, fail_msgs) = {
 873                                         let chan_id = match channel_state.short_to_id.get(&source_short_channel_id) {
 874                                                 Some(chan_id) => chan_id.clone(),
 875                                                 None => return false
 876                                         };
 877
 878                                         let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
 879                                         match chan.get_update_fail_htlc_and_commit(payment_hash, err_packet) {
 880                                                 Ok(msg) => (chan.get_their_node_id(), msg),
 881                                                 Err(_e) => {
 882                                                         //TODO: Do something with e?
 883                                                         return false;
 884                                                 },
 885                                         }
 886                                 };
 887
 888                                 match fail_msgs {
 889                                         Some((msg, commitment_msg, chan_monitor)) => {
 890                                                 mem::drop(channel_state);
 891
 892                                                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 893                                                         unimplemented!();// but def dont push the event...
 894                                                 }
 895
 896                                                 let mut pending_events = self.pending_events.lock().unwrap();
 897                                                 pending_events.push(events::Event::SendFailHTLC {
 898                                                         node_id,
 899                                                         msg: msg,
 900                                                         commitment_msg: commitment_msg,
 901                                                 });
 902                                         },
 903                                         None => {},
 904                                 }
 905
 906                                 true
 907                         },
 908                 }
 909         }
 910
 911         /// Provides a payment preimage in response to a PaymentReceived event, returning true and
 912         /// generating message events for the net layer to claim the payment, if possible. Thus, you
 913         /// should probably kick the net layer to go send messages if this returns true!
 914         /// May panic if called except in response to a PaymentReceived event.
 915         pub fn claim_funds(&self, payment_preimage: [u8; 32]) -> bool {
 916                 self.claim_funds_internal(payment_preimage, true)
 917         }
 918         pub fn claim_funds_internal(&self, payment_preimage: [u8; 32], from_user: bool) -> bool {
 919                 let mut sha = Sha256::new();
 920                 sha.input(&payment_preimage);
 921                 let mut payment_hash = [0; 32];
 922                 sha.result(&mut payment_hash);
 923
 924                 let mut channel_state = self.channel_state.lock().unwrap();
 925                 let mut pending_htlc = {
 926                         match channel_state.claimable_htlcs.remove(&payment_hash) {
 927                                 Some(pending_htlc) => pending_htlc,
 928                                 None => return false,
 929                         }
 930                 };
 931
 932                 match pending_htlc {
 933                         PendingOutboundHTLC::CycledRoute { source_short_channel_id, incoming_packet_shared_secret, route, session_priv } => {
 934                                 if from_user { // This was the end hop back to us
 935                                         pending_htlc = PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret };
 936                                         channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::OutboundRoute { route, session_priv });
 937                                 } else { // This came from the first upstream node
 938                                         // Bank error in our favor! Maybe we should tell the user this somehow???
 939                                         pending_htlc = PendingOutboundHTLC::OutboundRoute { route, session_priv };
 940                                         channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret });
 941                                 }
 942                         },
 943                         _ => {},
 944                 }
 945
 946                 match pending_htlc {
 947                         PendingOutboundHTLC::CycledRoute { .. } => { panic!("WAT"); },
 948                         PendingOutboundHTLC::OutboundRoute { .. } => {
 949                                 if from_user {
 950                                         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...");
 951                                 }
 952                                 mem::drop(channel_state);
 953                                 let mut pending_events = self.pending_events.lock().unwrap();
 954                                 pending_events.push(events::Event::PaymentSent {
 955                                         payment_preimage
 956                                 });
 957                                 false
 958                         },
 959                         PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, .. } => {
 960                                 let (node_id, fulfill_msgs) = {
 961                                         let chan_id = match channel_state.short_to_id.get(&source_short_channel_id) {
 962                                                 Some(chan_id) => chan_id.clone(),
 963                                                 None => return false
 964                                         };
 965
 966                                         let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
 967                                         match chan.get_update_fulfill_htlc_and_commit(payment_preimage) {
 968                                                 Ok(msg) => (chan.get_their_node_id(), msg),
 969                                                 Err(_e) => {
 970                                                         //TODO: Do something with e?
 971                                                         return false;
 972                                                 },
 973                                         }
 974                                 };
 975
 976                                 mem::drop(channel_state);
 977                                 match fulfill_msgs {
 978                                         Some((msg, commitment_msg, chan_monitor)) => {
 979                                                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 980                                                         unimplemented!();// but def dont push the event...
 981                                                 }
 982
 983                                                 let mut pending_events = self.pending_events.lock().unwrap();
 984                                                 pending_events.push(events::Event::SendFulfillHTLC {
 985                                                         node_id: node_id,
 986                                                         msg,
 987                                                         commitment_msg,
 988                                                 });
 989                                         },
 990                                         None => {},
 991                                 }
 992                                 true
 993                         },
 994                 }
 995         }
 996
 997         /// Gets the node_id held by this ChannelManager
 998         pub fn get_our_node_id(&self) -> PublicKey {
 999                 PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).unwrap()
1000         }
1001
1002         /// Used to restore channels to normal operation after a
1003         /// ChannelMonitorUpdateErr::TemporaryFailure was returned from a channel monitor update
1004         /// operation.
1005         pub fn test_restore_channel_monitor(&self) {
1006                 unimplemented!();
1007         }
1008 }
1009
1010 impl events::EventsProvider for ChannelManager {
1011         fn get_and_clear_pending_events(&self) -> Vec<events::Event> {
1012                 let mut pending_events = self.pending_events.lock().unwrap();
1013                 let mut ret = Vec::new();
1014                 mem::swap(&mut ret, &mut *pending_events);
1015                 ret
1016         }
1017 }
1018
1019 impl ChainListener for ChannelManager {
1020         fn block_connected(&self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) {
1021                 let mut new_events = Vec::new();
1022                 {
1023                         let mut channel_state = self.channel_state.lock().unwrap();
1024                         let mut short_to_ids_to_insert = Vec::new();
1025                         let mut short_to_ids_to_remove = Vec::new();
1026                         channel_state.by_id.retain(|_, channel| {
1027                                 if let Some(funding_locked) = channel.block_connected(header, height, txn_matched, indexes_of_txn_matched) {
1028                                         let announcement_sigs = match self.get_announcement_sigs(channel) {
1029                                                 Ok(res) => res,
1030                                                 Err(_e) => {
1031                                                         //TODO: push e on events and blow up the channel (it has bad keys)
1032                                                         return true;
1033                                                 }
1034                                         };
1035                                         new_events.push(events::Event::SendFundingLocked {
1036                                                 node_id: channel.get_their_node_id(),
1037                                                 msg: funding_locked,
1038                                                 announcement_sigs: announcement_sigs
1039                                         });
1040                                         short_to_ids_to_insert.push((channel.get_short_channel_id().unwrap(), channel.channel_id()));
1041                                 }
1042                                 if let Some(funding_txo) = channel.get_funding_txo() {
1043                                         for tx in txn_matched {
1044                                                 for inp in tx.input.iter() {
1045                                                         if inp.prev_hash == funding_txo.txid && inp.prev_index == funding_txo.index as u32 {
1046                                                                 if let Some(short_id) = channel.get_short_channel_id() {
1047                                                                         short_to_ids_to_remove.push(short_id);
1048                                                                 }
1049                                                                 channel.force_shutdown();
1050                                                                 if let Ok(update) = self.get_channel_update(&channel) {
1051                                                                         new_events.push(events::Event::BroadcastChannelUpdate {
1052                                                                                 msg: update
1053                                                                         });
1054                                                                 }
1055                                                                 return false;
1056                                                         }
1057                                                 }
1058                                         }
1059                                 }
1060                                 if channel.channel_monitor().would_broadcast_at_height(height) {
1061                                         if let Some(short_id) = channel.get_short_channel_id() {
1062                                                 short_to_ids_to_remove.push(short_id);
1063                                         }
1064                                         channel.force_shutdown();
1065                                         if let Ok(update) = self.get_channel_update(&channel) {
1066                                                 new_events.push(events::Event::BroadcastChannelUpdate {
1067                                                         msg: update
1068                                                 });
1069                                         }
1070                                         return false;
1071                                 }
1072                                 true
1073                         });
1074                         for to_remove in short_to_ids_to_remove {
1075                                 channel_state.short_to_id.remove(&to_remove);
1076                         }
1077                         for to_insert in short_to_ids_to_insert {
1078                                 channel_state.short_to_id.insert(to_insert.0, to_insert.1);
1079                         }
1080                 }
1081                 let mut pending_events = self.pending_events.lock().unwrap();
1082                 for funding_locked in new_events.drain(..) {
1083                         pending_events.push(funding_locked);
1084                 }
1085         }
1086
1087         /// We force-close the channel without letting our counterparty participate in the shutdown
1088         fn block_disconnected(&self, header: &BlockHeader) {
1089                 let mut channel_lock = self.channel_state.lock().unwrap();
1090                 let channel_state = channel_lock.borrow_parts();
1091                 let short_to_id = channel_state.short_to_id;
1092                 channel_state.by_id.retain(|_,  v| {
1093                         if v.block_disconnected(header) {
1094                                 let tx = v.force_shutdown();
1095                                 for broadcast_tx in tx {
1096                                         self.tx_broadcaster.broadcast_transaction(&broadcast_tx);
1097                                 }
1098                                 if let Some(short_id) = v.get_short_channel_id() {
1099                                         short_to_id.remove(&short_id);
1100                                 }
1101                                 false
1102                         } else {
1103                                 true
1104                         }
1105                 });
1106         }
1107 }
1108
1109 impl ChannelMessageHandler for ChannelManager {
1110         //TODO: Handle errors and close channel (or so)
1111         fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &msgs::OpenChannel) -> Result<msgs::AcceptChannel, HandleError> {
1112                 if msg.chain_hash != self.genesis_hash {
1113                         return Err(HandleError{err: "Unknown genesis block hash", action: None});
1114                 }
1115                 let mut channel_state = self.channel_state.lock().unwrap();
1116                 if channel_state.by_id.contains_key(&msg.temporary_channel_id) {
1117                         return Err(HandleError{err: "temporary_channel_id collision!", action: None});
1118                 }
1119
1120                 let chan_keys = if cfg!(feature = "fuzztarget") {
1121                         ChannelKeys {
1122                                 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(),
1123                                 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(),
1124                                 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(),
1125                                 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(),
1126                                 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(),
1127                                 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(),
1128                                 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(),
1129                                 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],
1130                         }
1131                 } else {
1132                         let mut key_seed = [0u8; 32];
1133                         rng::fill_bytes(&mut key_seed);
1134                         match ChannelKeys::new_from_seed(&key_seed) {
1135                                 Ok(key) => key,
1136                                 Err(_) => panic!("RNG is busted!")
1137                         }
1138                 };
1139
1140                 let channel = Channel::new_from_req(&*self.fee_estimator, chan_keys, their_node_id.clone(), msg, 0, self.announce_channels_publicly)?;
1141                 let accept_msg = channel.get_accept_channel()?;
1142                 channel_state.by_id.insert(channel.channel_id(), channel);
1143                 Ok(accept_msg)
1144         }
1145
1146         fn handle_accept_channel(&self, their_node_id: &PublicKey, msg: &msgs::AcceptChannel) -> Result<(), HandleError> {
1147                 let (value, output_script, user_id) = {
1148                         let mut channel_state = self.channel_state.lock().unwrap();
1149                         match channel_state.by_id.get_mut(&msg.temporary_channel_id) {
1150                                 Some(chan) => {
1151                                         if chan.get_their_node_id() != *their_node_id {
1152                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1153                                         }
1154                                         chan.accept_channel(&msg)?;
1155                                         (chan.get_value_satoshis(), chan.get_funding_redeemscript().to_v0_p2wsh(), chan.get_user_id())
1156                                 },
1157                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1158                         }
1159                 };
1160                 let mut pending_events = self.pending_events.lock().unwrap();
1161                 pending_events.push(events::Event::FundingGenerationReady {
1162                         temporary_channel_id: msg.temporary_channel_id,
1163                         channel_value_satoshis: value,
1164                         output_script: output_script,
1165                         user_channel_id: user_id,
1166                 });
1167                 Ok(())
1168         }
1169
1170         fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) -> Result<msgs::FundingSigned, HandleError> {
1171                 //TODO: broke this - a node shouldn't be able to get their channel removed by sending a
1172                 //funding_created a second time, or long after the first, or whatever (note this also
1173                 //leaves the short_to_id map in a busted state.
1174                 let (chan, funding_msg, monitor_update) = {
1175                         let mut channel_state = self.channel_state.lock().unwrap();
1176                         match channel_state.by_id.remove(&msg.temporary_channel_id) {
1177                                 Some(mut chan) => {
1178                                         if chan.get_their_node_id() != *their_node_id {
1179                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1180                                         }
1181                                         match chan.funding_created(msg) {
1182                                                 Ok((funding_msg, monitor_update)) => {
1183                                                         (chan, funding_msg, monitor_update)
1184                                                 },
1185                                                 Err(e) => {
1186                                                         return Err(e);
1187                                                 }
1188                                         }
1189                                 },
1190                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1191                         }
1192                 }; // Release channel lock for install_watch_outpoint call,
1193                    // note that this means if the remote end is misbehaving and sends a message for the same
1194                    // channel back-to-back with funding_created, we'll end up thinking they sent a message
1195                    // for a bogus channel.
1196                 if let Err(_e) = self.monitor.add_update_monitor(monitor_update.get_funding_txo().unwrap(), monitor_update) {
1197                         unimplemented!();
1198                 }
1199                 let mut channel_state = self.channel_state.lock().unwrap();
1200                 channel_state.by_id.insert(funding_msg.channel_id, chan);
1201                 Ok(funding_msg)
1202         }
1203
1204         fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) -> Result<(), HandleError> {
1205                 let (funding_txo, user_id, monitor) = {
1206                         let mut channel_state = self.channel_state.lock().unwrap();
1207                         match channel_state.by_id.get_mut(&msg.channel_id) {
1208                                 Some(chan) => {
1209                                         if chan.get_their_node_id() != *their_node_id {
1210                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1211                                         }
1212                                         let chan_monitor = chan.funding_signed(&msg)?;
1213                                         (chan.get_funding_txo().unwrap(), chan.get_user_id(), chan_monitor)
1214                                 },
1215                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1216                         }
1217                 };
1218                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor) {
1219                         unimplemented!();
1220                 }
1221                 let mut pending_events = self.pending_events.lock().unwrap();
1222                 pending_events.push(events::Event::FundingBroadcastSafe {
1223                         funding_txo: funding_txo,
1224                         user_channel_id: user_id,
1225                 });
1226                 Ok(())
1227         }
1228
1229         fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &msgs::FundingLocked) -> Result<Option<msgs::AnnouncementSignatures>, HandleError> {
1230                 let mut channel_state = self.channel_state.lock().unwrap();
1231                 match channel_state.by_id.get_mut(&msg.channel_id) {
1232                         Some(chan) => {
1233                                 if chan.get_their_node_id() != *their_node_id {
1234                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1235                                 }
1236                                 chan.funding_locked(&msg)?;
1237                                 return Ok(self.get_announcement_sigs(chan)?);
1238                         },
1239                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1240                 };
1241         }
1242
1243         fn handle_shutdown(&self, their_node_id: &PublicKey, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>), HandleError> {
1244                 let (res, chan_option) = {
1245                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1246                         let channel_state = channel_state_lock.borrow_parts();
1247
1248                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1249                                 hash_map::Entry::Occupied(mut chan_entry) => {
1250                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1251                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1252                                         }
1253                                         let res = chan_entry.get_mut().shutdown(&*self.fee_estimator, &msg)?;
1254                                         if chan_entry.get().is_shutdown() {
1255                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
1256                                                         channel_state.short_to_id.remove(&short_id);
1257                                                 }
1258                                                 (res, Some(chan_entry.remove_entry().1))
1259                                         } else { (res, None) }
1260                                 },
1261                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1262                         }
1263                 };
1264                 for payment_hash in res.2 {
1265                         // unknown_next_peer...I dunno who that is anymore....
1266                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
1267                 }
1268                 if let Some(chan) = chan_option {
1269                         if let Ok(update) = self.get_channel_update(&chan) {
1270                                 let mut events = self.pending_events.lock().unwrap();
1271                                 events.push(events::Event::BroadcastChannelUpdate {
1272                                         msg: update
1273                                 });
1274                         }
1275                 }
1276                 Ok((res.0, res.1))
1277         }
1278
1279         fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &msgs::ClosingSigned) -> Result<Option<msgs::ClosingSigned>, HandleError> {
1280                 let (res, chan_option) = {
1281                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1282                         let channel_state = channel_state_lock.borrow_parts();
1283                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1284                                 hash_map::Entry::Occupied(mut chan_entry) => {
1285                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1286                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1287                                         }
1288                                         let res = chan_entry.get_mut().closing_signed(&*self.fee_estimator, &msg)?;
1289                                         if res.1.is_some() {
1290                                                 // We're done with this channel, we've got a signed closing transaction and
1291                                                 // will send the closing_signed back to the remote peer upon return. This
1292                                                 // also implies there are no pending HTLCs left on the channel, so we can
1293                                                 // fully delete it from tracking (the channel monitor is still around to
1294                                                 // watch for old state broadcasts)!
1295                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
1296                                                         channel_state.short_to_id.remove(&short_id);
1297                                                 }
1298                                                 (res, Some(chan_entry.remove_entry().1))
1299                                         } else { (res, None) }
1300                                 },
1301                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1302                         }
1303                 };
1304                 if let Some(broadcast_tx) = res.1 {
1305                         self.tx_broadcaster.broadcast_transaction(&broadcast_tx);
1306                 }
1307                 if let Some(chan) = chan_option {
1308                         if let Ok(update) = self.get_channel_update(&chan) {
1309                                 let mut events = self.pending_events.lock().unwrap();
1310                                 events.push(events::Event::BroadcastChannelUpdate {
1311                                         msg: update
1312                                 });
1313                         }
1314                 }
1315                 Ok(res.0)
1316         }
1317
1318         fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) -> Result<(), msgs::HandleError> {
1319                 //TODO: BOLT 4 points out a specific attack where a peer may re-send an onion packet and
1320                 //determine the state of the payment based on our response/if we forward anything/the time
1321                 //we take to respond. We should take care to avoid allowing such an attack.
1322                 //
1323                 //TODO: There exists a further attack where a node may garble the onion data, forward it to
1324                 //us repeatedly garbled in different ways, and compare our error messages, which are
1325                 //encrypted with the same key. Its not immediately obvious how to usefully exploit that,
1326                 //but we should prevent it anyway.
1327
1328                 let shared_secret = SharedSecret::new(&self.secp_ctx, &msg.onion_routing_packet.public_key, &self.our_network_key);
1329                 let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
1330
1331                 let associated_data = Vec::new(); //TODO: What to put here?
1332
1333                 macro_rules! get_onion_hash {
1334                         () => {
1335                                 {
1336                                         let mut sha = Sha256::new();
1337                                         sha.input(&msg.onion_routing_packet.hop_data);
1338                                         let mut onion_hash = [0; 32];
1339                                         sha.result(&mut onion_hash);
1340                                         onion_hash
1341                                 }
1342                         }
1343                 }
1344
1345                 macro_rules! return_err {
1346                         ($msg: expr, $err_code: expr, $data: expr) => {
1347                                 return Err(msgs::HandleError {
1348                                         err: $msg,
1349                                         action: Some(msgs::ErrorAction::UpdateFailHTLC {
1350                                                 msg: msgs::UpdateFailHTLC {
1351                                                         channel_id: msg.channel_id,
1352                                                         htlc_id: msg.htlc_id,
1353                                                         reason: ChannelManager::build_first_hop_failure_packet(&shared_secret, $err_code, $data),
1354                                                 }
1355                                         }),
1356                                 });
1357                         }
1358                 }
1359
1360                 if msg.onion_routing_packet.version != 0 {
1361                         //TODO: Spec doesn't indicate if we should only hash hop_data here (and in other
1362                         //sha256_of_onion error data packets), or the entire onion_routing_packet. Either way,
1363                         //the hash doesn't really serve any purpuse - in the case of hashing all data, the
1364                         //receiving node would have to brute force to figure out which version was put in the
1365                         //packet by the node that send us the message, in the case of hashing the hop_data, the
1366                         //node knows the HMAC matched, so they already know what is there...
1367                         return_err!("Unknown onion packet version", 0x8000 | 0x4000 | 4, &get_onion_hash!());
1368                 }
1369
1370                 let mut hmac = Hmac::new(Sha256::new(), &mu);
1371                 hmac.input(&msg.onion_routing_packet.hop_data);
1372                 hmac.input(&associated_data[..]);
1373                 if hmac.result() != MacResult::new(&msg.onion_routing_packet.hmac) {
1374                         return_err!("HMAC Check failed", 0x8000 | 0x4000 | 5, &get_onion_hash!());
1375                 }
1376
1377                 let mut chacha = ChaCha20::new(&rho, &[0u8; 8]);
1378                 let next_hop_data = {
1379                         let mut decoded = [0; 65];
1380                         chacha.process(&msg.onion_routing_packet.hop_data[0..65], &mut decoded);
1381                         match msgs::OnionHopData::decode(&decoded[..]) {
1382                                 Err(err) => {
1383                                         let error_code = match err {
1384                                                 msgs::DecodeError::UnknownRealmByte => 0x4000 | 1,
1385                                                 _ => 0x2000 | 2, // Should never happen
1386                                         };
1387                                         return_err!("Unable to decode our hop data", error_code, &[0;0]);
1388                                 },
1389                                 Ok(msg) => msg
1390                         }
1391                 };
1392
1393                 let mut pending_forward_info = if next_hop_data.hmac == [0; 32] {
1394                                 // OUR PAYMENT!
1395                                 if next_hop_data.data.amt_to_forward != msg.amount_msat {
1396                                         return_err!("Upstream node sent less than we were supposed to receive in payment", 19, &byte_utils::be64_to_array(msg.amount_msat));
1397                                 }
1398                                 if next_hop_data.data.outgoing_cltv_value != msg.cltv_expiry {
1399                                         return_err!("Upstream node set CLTV to the wrong value", 18, &byte_utils::be32_to_array(msg.cltv_expiry));
1400                                 }
1401
1402                                 // Note that we could obviously respond immediately with an update_fulfill_htlc
1403                                 // message, however that would leak that we are the recipient of this payment, so
1404                                 // instead we stay symmetric with the forwarding case, only responding (after a
1405                                 // delay) once they've send us a commitment_signed!
1406
1407                                 PendingForwardHTLCInfo {
1408                                         onion_packet: None,
1409                                         payment_hash: msg.payment_hash.clone(),
1410                                         short_channel_id: 0,
1411                                         prev_short_channel_id: 0,
1412                                         amt_to_forward: next_hop_data.data.amt_to_forward,
1413                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
1414                                 }
1415                         } else {
1416                                 let mut new_packet_data = [0; 20*65];
1417                                 chacha.process(&msg.onion_routing_packet.hop_data[65..], &mut new_packet_data[0..19*65]);
1418                                 chacha.process(&ChannelManager::ZERO[0..65], &mut new_packet_data[19*65..]);
1419
1420                                 let mut new_pubkey = msg.onion_routing_packet.public_key.clone();
1421
1422                                 let blinding_factor = {
1423                                         let mut sha = Sha256::new();
1424                                         sha.input(&new_pubkey.serialize()[..]);
1425                                         sha.input(&shared_secret[..]);
1426                                         let mut res = [0u8; 32];
1427                                         sha.result(&mut res);
1428                                         match SecretKey::from_slice(&self.secp_ctx, &res) {
1429                                                 Err(_) => {
1430                                                         // Return temporary node failure as its technically our issue, not the
1431                                                         // channel's issue.
1432                                                         return_err!("Blinding factor is an invalid private key", 0x2000 | 2, &[0;0]);
1433                                                 },
1434                                                 Ok(key) => key
1435                                         }
1436                                 };
1437
1438                                 match new_pubkey.mul_assign(&self.secp_ctx, &blinding_factor) {
1439                                         Err(_) => {
1440                                                 // Return temporary node failure as its technically our issue, not the
1441                                                 // channel's issue.
1442                                                 return_err!("New blinding factor is an invalid private key", 0x2000 | 2, &[0;0]);
1443                                         },
1444                                         Ok(_) => {}
1445                                 };
1446
1447                                 let outgoing_packet = msgs::OnionPacket {
1448                                         version: 0,
1449                                         public_key: new_pubkey,
1450                                         hop_data: new_packet_data,
1451                                         hmac: next_hop_data.hmac.clone(),
1452                                 };
1453
1454                                 //TODO: Check amt_to_forward and outgoing_cltv_value are within acceptable ranges!
1455
1456                                 PendingForwardHTLCInfo {
1457                                         onion_packet: Some(outgoing_packet),
1458                                         payment_hash: msg.payment_hash.clone(),
1459                                         short_channel_id: next_hop_data.data.short_channel_id,
1460                                         prev_short_channel_id: 0,
1461                                         amt_to_forward: next_hop_data.data.amt_to_forward,
1462                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
1463                                 }
1464                         };
1465
1466                 let mut channel_state_lock = self.channel_state.lock().unwrap();
1467                 let channel_state = channel_state_lock.borrow_parts();
1468
1469                 if pending_forward_info.onion_packet.is_some() { // If short_channel_id is 0 here, we'll reject them in the body here
1470                         let forwarding_id = match channel_state.short_to_id.get(&pending_forward_info.short_channel_id) {
1471                                 None => {
1472                                         return_err!("Don't have available channel for forwarding as requested.", 0x4000 | 10, &[0;0]);
1473                                 },
1474                                 Some(id) => id.clone(),
1475                         };
1476                         let chan = channel_state.by_id.get_mut(&forwarding_id).unwrap();
1477                         if !chan.is_live() {
1478                                 let chan_update = self.get_channel_update(chan).unwrap();
1479                                 return_err!("Forwarding channel is not in a ready state.", 0x1000 | 7, &chan_update.encode_with_len()[..]);
1480                         }
1481                 }
1482
1483                 let claimable_htlcs_entry = channel_state.claimable_htlcs.entry(msg.payment_hash.clone());
1484
1485                 // We dont correctly handle payments that route through us twice on their way to their
1486                 // destination. That's OK since those nodes are probably busted or trying to do network
1487                 // mapping through repeated loops. In either case, we want them to stop talking to us, so
1488                 // we send permanent_node_failure.
1489                 match &claimable_htlcs_entry {
1490                         &hash_map::Entry::Occupied(ref e) => {
1491                                 let mut acceptable_cycle = false;
1492                                 match e.get() {
1493                                         &PendingOutboundHTLC::OutboundRoute { .. } => {
1494                                                 acceptable_cycle = pending_forward_info.short_channel_id == 0;
1495                                         },
1496                                         _ => {},
1497                                 }
1498                                 if !acceptable_cycle {
1499                                         return_err!("Payment looped through us twice", 0x4000 | 0x2000 | 2, &[0;0]);
1500                                 }
1501                         },
1502                         _ => {},
1503                 }
1504
1505                 let (source_short_channel_id, res) = match channel_state.by_id.get_mut(&msg.channel_id) {
1506                         Some(chan) => {
1507                                 if chan.get_their_node_id() != *their_node_id {
1508                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1509                                 }
1510                                 if !chan.is_usable() {
1511                                         return Err(HandleError{err: "Channel not yet available for receiving HTLCs", action: None});
1512                                 }
1513                                 let short_channel_id = chan.get_short_channel_id().unwrap();
1514                                 pending_forward_info.prev_short_channel_id = short_channel_id;
1515                                 (short_channel_id, chan.update_add_htlc(&msg, pending_forward_info)?)
1516                         },
1517                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None}), //TODO: panic?
1518                 };
1519
1520                 match claimable_htlcs_entry {
1521                         hash_map::Entry::Occupied(mut e) => {
1522                                 let outbound_route = e.get_mut();
1523                                 let (route, session_priv) = match outbound_route {
1524                                         &mut PendingOutboundHTLC::OutboundRoute { ref route, ref session_priv } => {
1525                                                 (route.clone(), session_priv.clone())
1526                                         },
1527                                         _ => { panic!("WAT") },
1528                                 };
1529                                 *outbound_route = PendingOutboundHTLC::CycledRoute {
1530                                         source_short_channel_id,
1531                                         incoming_packet_shared_secret: shared_secret,
1532                                         route,
1533                                         session_priv,
1534                                 };
1535                         },
1536                         hash_map::Entry::Vacant(e) => {
1537                                 e.insert(PendingOutboundHTLC::IntermediaryHopData {
1538                                         source_short_channel_id,
1539                                         incoming_packet_shared_secret: shared_secret,
1540                                 });
1541                         }
1542                 }
1543
1544                 Ok(res)
1545         }
1546
1547         fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) -> Result<(), HandleError> {
1548                 //TODO: Delay the claimed_funds relaying just like we do outbound relay!
1549                 // Claim funds first, cause we don't really care if the channel we received the message on
1550                 // is broken, we may have enough info to get our own money!
1551                 self.claim_funds_internal(msg.payment_preimage.clone(), false);
1552
1553                 let monitor = {
1554                         let mut channel_state = self.channel_state.lock().unwrap();
1555                         match channel_state.by_id.get_mut(&msg.channel_id) {
1556                                 Some(chan) => {
1557                                         if chan.get_their_node_id() != *their_node_id {
1558                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1559                                         }
1560                                         chan.update_fulfill_htlc(&msg)?
1561                                 },
1562                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1563                         }
1564                 };
1565                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor) {
1566                         unimplemented!();
1567                 }
1568                 Ok(())
1569         }
1570
1571         fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) -> Result<Option<msgs::HTLCFailChannelUpdate>, HandleError> {
1572                 let mut channel_state = self.channel_state.lock().unwrap();
1573                 let payment_hash = match channel_state.by_id.get_mut(&msg.channel_id) {
1574                         Some(chan) => {
1575                                 if chan.get_their_node_id() != *their_node_id {
1576                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1577                                 }
1578                                 chan.update_fail_htlc(&msg, HTLCFailReason::ErrorPacket { err: msg.reason.clone() })
1579                         },
1580                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1581                 }?;
1582
1583                 if let Some(pending_htlc) = channel_state.claimable_htlcs.get(&payment_hash) {
1584                         match pending_htlc {
1585                                 &PendingOutboundHTLC::OutboundRoute { ref route, ref session_priv } => {
1586                                         // Handle packed channel/node updates for passing back for the route handler
1587                                         let mut packet_decrypted = msg.reason.data.clone();
1588                                         let mut res = None;
1589                                         Self::construct_onion_keys_callback(&self.secp_ctx, &route, &session_priv, |shared_secret, _, _, route_hop| {
1590                                                 if res.is_some() { return; }
1591
1592                                                 let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
1593
1594                                                 let mut decryption_tmp = Vec::with_capacity(packet_decrypted.len());
1595                                                 decryption_tmp.resize(packet_decrypted.len(), 0);
1596                                                 let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
1597                                                 chacha.process(&packet_decrypted, &mut decryption_tmp[..]);
1598                                                 packet_decrypted = decryption_tmp;
1599
1600                                                 if let Ok(err_packet) = msgs::DecodedOnionErrorPacket::decode(&packet_decrypted) {
1601                                                         if err_packet.failuremsg.len() >= 2 {
1602                                                                 let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
1603
1604                                                                 let mut hmac = Hmac::new(Sha256::new(), &um);
1605                                                                 hmac.input(&err_packet.encode()[32..]);
1606                                                                 let mut calc_tag = [0u8; 32];
1607                                                                 hmac.raw_result(&mut calc_tag);
1608                                                                 if crypto::util::fixed_time_eq(&calc_tag, &err_packet.hmac) {
1609                                                                         const UNKNOWN_CHAN: u16 = 0x4000|10;
1610                                                                         const TEMP_CHAN_FAILURE: u16 = 0x4000|7;
1611                                                                         match byte_utils::slice_to_be16(&err_packet.failuremsg[0..2]) {
1612                                                                                 TEMP_CHAN_FAILURE => {
1613                                                                                         if err_packet.failuremsg.len() >= 4 {
1614                                                                                                 let update_len = byte_utils::slice_to_be16(&err_packet.failuremsg[2..4]) as usize;
1615                                                                                                 if err_packet.failuremsg.len() >= 4 + update_len {
1616                                                                                                         if let Ok(chan_update) = msgs::ChannelUpdate::decode(&err_packet.failuremsg[4..4 + update_len]) {
1617                                                                                                                 res = Some(msgs::HTLCFailChannelUpdate::ChannelUpdateMessage {
1618                                                                                                                         msg: chan_update,
1619                                                                                                                 });
1620                                                                                                         }
1621                                                                                                 }
1622                                                                                         }
1623                                                                                 },
1624                                                                                 UNKNOWN_CHAN => {
1625                                                                                         // No such next-hop. We know this came from the
1626                                                                                         // current node as the HMAC validated.
1627                                                                                         res = Some(msgs::HTLCFailChannelUpdate::ChannelClosed {
1628                                                                                                 short_channel_id: route_hop.short_channel_id
1629                                                                                         });
1630                                                                                 },
1631                                                                                 _ => {}, //TODO: Enumerate all of these!
1632                                                                         }
1633                                                                 }
1634                                                         }
1635                                                 }
1636                                         }).unwrap();
1637                                         Ok(res)
1638                                 },
1639                                 _ => { Ok(None) },
1640                         }
1641                 } else {
1642                         Ok(None)
1643                 }
1644         }
1645
1646         fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) -> Result<(), HandleError> {
1647                 let mut channel_state = self.channel_state.lock().unwrap();
1648                 match channel_state.by_id.get_mut(&msg.channel_id) {
1649                         Some(chan) => {
1650                                 if chan.get_their_node_id() != *their_node_id {
1651                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1652                                 }
1653                                 chan.update_fail_malformed_htlc(&msg, HTLCFailReason::Reason { failure_code: msg.failure_code, data: Vec::new() })
1654                         },
1655                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1656                 }
1657         }
1658
1659         fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>), HandleError> {
1660                 let (revoke_and_ack, commitment_signed, chan_monitor) = {
1661                         let mut channel_state = self.channel_state.lock().unwrap();
1662                         match channel_state.by_id.get_mut(&msg.channel_id) {
1663                                 Some(chan) => {
1664                                         if chan.get_their_node_id() != *their_node_id {
1665                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1666                                         }
1667                                         chan.commitment_signed(&msg)?
1668                                 },
1669                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1670                         }
1671                 };
1672                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1673                         unimplemented!();
1674                 }
1675
1676                 Ok((revoke_and_ack, commitment_signed))
1677         }
1678
1679         fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) -> Result<Option<msgs::CommitmentUpdate>, HandleError> {
1680                 let (res, mut pending_forwards, mut pending_failures, chan_monitor) = {
1681                         let mut channel_state = self.channel_state.lock().unwrap();
1682                         match channel_state.by_id.get_mut(&msg.channel_id) {
1683                                 Some(chan) => {
1684                                         if chan.get_their_node_id() != *their_node_id {
1685                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1686                                         }
1687                                         chan.revoke_and_ack(&msg)?
1688                                 },
1689                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1690                         }
1691                 };
1692                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1693                         unimplemented!();
1694                 }
1695                 for failure in pending_failures.drain(..) {
1696                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &failure.0, failure.1);
1697                 }
1698
1699                 let mut forward_event = None;
1700                 if !pending_forwards.is_empty() {
1701                         let mut channel_state = self.channel_state.lock().unwrap();
1702                         if channel_state.forward_htlcs.is_empty() {
1703                                 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));
1704                                 channel_state.next_forward = forward_event.unwrap();
1705                         }
1706                         for forward_info in pending_forwards.drain(..) {
1707                                 match channel_state.forward_htlcs.entry(forward_info.short_channel_id) {
1708                                         hash_map::Entry::Occupied(mut entry) => {
1709                                                 entry.get_mut().push(forward_info);
1710                                         },
1711                                         hash_map::Entry::Vacant(entry) => {
1712                                                 entry.insert(vec!(forward_info));
1713                                         }
1714                                 }
1715                         }
1716                 }
1717                 match forward_event {
1718                         Some(time) => {
1719                                 let mut pending_events = self.pending_events.lock().unwrap();
1720                                 pending_events.push(events::Event::PendingHTLCsForwardable {
1721                                         time_forwardable: time
1722                                 });
1723                         }
1724                         None => {},
1725                 }
1726
1727                 Ok(res)
1728         }
1729
1730         fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) -> Result<(), HandleError> {
1731                 let mut channel_state = self.channel_state.lock().unwrap();
1732                 match channel_state.by_id.get_mut(&msg.channel_id) {
1733                         Some(chan) => {
1734                                 if chan.get_their_node_id() != *their_node_id {
1735                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1736                                 }
1737                                 chan.update_fee(&*self.fee_estimator, &msg)
1738                         },
1739                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1740                 }
1741         }
1742
1743         fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) -> Result<(), HandleError> {
1744                 let (chan_announcement, chan_update) = {
1745                         let mut channel_state = self.channel_state.lock().unwrap();
1746                         match channel_state.by_id.get_mut(&msg.channel_id) {
1747                                 Some(chan) => {
1748                                         if chan.get_their_node_id() != *their_node_id {
1749                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1750                                         }
1751                                         if !chan.is_usable() {
1752                                                 return Err(HandleError{err: "Got an announcement_signatures before we were ready for it", action: None });
1753                                         }
1754
1755                                         let our_node_id = self.get_our_node_id();
1756                                         let (announcement, our_bitcoin_sig) = chan.get_channel_announcement(our_node_id.clone(), self.genesis_hash.clone())?;
1757
1758                                         let were_node_one = announcement.node_id_1 == our_node_id;
1759                                         let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
1760                                         secp_call!(self.secp_ctx.verify(&msghash, &msg.node_signature, if were_node_one { &announcement.node_id_2 } else { &announcement.node_id_1 }));
1761                                         secp_call!(self.secp_ctx.verify(&msghash, &msg.bitcoin_signature, if were_node_one { &announcement.bitcoin_key_2 } else { &announcement.bitcoin_key_1 }));
1762
1763                                         let our_node_sig = secp_call!(self.secp_ctx.sign(&msghash, &self.our_network_key));
1764
1765                                         (msgs::ChannelAnnouncement {
1766                                                 node_signature_1: if were_node_one { our_node_sig } else { msg.node_signature },
1767                                                 node_signature_2: if were_node_one { msg.node_signature } else { our_node_sig },
1768                                                 bitcoin_signature_1: if were_node_one { our_bitcoin_sig } else { msg.bitcoin_signature },
1769                                                 bitcoin_signature_2: if were_node_one { msg.bitcoin_signature } else { our_bitcoin_sig },
1770                                                 contents: announcement,
1771                                         }, self.get_channel_update(chan).unwrap()) // can only fail if we're not in a ready state
1772                                 },
1773                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1774                         }
1775                 };
1776                 let mut pending_events = self.pending_events.lock().unwrap();
1777                 pending_events.push(events::Event::BroadcastChannelAnnouncement { msg: chan_announcement, update_msg: chan_update });
1778                 Ok(())
1779         }
1780
1781         fn peer_disconnected(&self, their_node_id: &PublicKey, no_connection_possible: bool) {
1782                 let mut new_events = Vec::new();
1783                 {
1784                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1785                         let channel_state = channel_state_lock.borrow_parts();
1786                         let short_to_id = channel_state.short_to_id;
1787                         if no_connection_possible {
1788                                 channel_state.by_id.retain(|_, chan| {
1789                                         if chan.get_their_node_id() == *their_node_id {
1790                                                 if let Some(short_id) = chan.get_short_channel_id() {
1791                                                         short_to_id.remove(&short_id);
1792                                                 }
1793                                                 let txn_to_broadcast = chan.force_shutdown();
1794                                                 for tx in txn_to_broadcast {
1795                                                         self.tx_broadcaster.broadcast_transaction(&tx);
1796                                                 }
1797                                                 if let Ok(update) = self.get_channel_update(&chan) {
1798                                                         new_events.push(events::Event::BroadcastChannelUpdate {
1799                                                                 msg: update
1800                                                         });
1801                                                 }
1802                                                 false
1803                                         } else {
1804                                                 true
1805                                         }
1806                                 });
1807                         } else {
1808                                 for chan in channel_state.by_id {
1809                                         if chan.1.get_their_node_id() == *their_node_id {
1810                                                 //TODO: mark channel disabled (and maybe announce such after a timeout). Also
1811                                                 //fail and wipe any uncommitted outbound HTLCs as those are considered after
1812                                                 //reconnect.
1813                                         }
1814                                 }
1815                         }
1816                 }
1817                 if !new_events.is_empty() {
1818                         let mut pending_events = self.pending_events.lock().unwrap();
1819                         for event in new_events.drain(..) {
1820                                 pending_events.push(event);
1821                         }
1822                 }
1823         }
1824 }
1825
1826 #[cfg(test)]
1827 mod tests {
1828         use chain::chaininterface;
1829         use chain::transaction::OutPoint;
1830         use chain::chaininterface::ChainListener;
1831         use ln::channelmanager::{ChannelManager,OnionKeys};
1832         use ln::router::{Route, RouteHop, Router};
1833         use ln::msgs;
1834         use ln::msgs::{MsgEncodable,ChannelMessageHandler,RoutingMessageHandler};
1835         use util::test_utils;
1836         use util::events::{Event, EventsProvider};
1837
1838         use bitcoin::util::misc::hex_bytes;
1839         use bitcoin::util::hash::Sha256dHash;
1840         use bitcoin::blockdata::block::{Block, BlockHeader};
1841         use bitcoin::blockdata::transaction::{Transaction, TxOut};
1842         use bitcoin::network::constants::Network;
1843         use bitcoin::network::serialize::serialize;
1844         use bitcoin::network::serialize::BitcoinHash;
1845
1846         use secp256k1::Secp256k1;
1847         use secp256k1::key::{PublicKey,SecretKey};
1848
1849         use crypto::sha2::Sha256;
1850         use crypto::digest::Digest;
1851
1852         use rand::{thread_rng,Rng};
1853
1854         use std::collections::HashMap;
1855         use std::default::Default;
1856         use std::sync::{Arc, Mutex};
1857         use std::time::Instant;
1858         use std::mem;
1859
1860         fn build_test_onion_keys() -> Vec<OnionKeys> {
1861                 // Keys from BOLT 4, used in both test vector tests
1862                 let secp_ctx = Secp256k1::new();
1863
1864                 let route = Route {
1865                         hops: vec!(
1866                                         RouteHop {
1867                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]).unwrap(),
1868                                                 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
1869                                         },
1870                                         RouteHop {
1871                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("0324653eac434488002cc06bbfb7f10fe18991e35f9fe4302dbea6d2353dc0ab1c").unwrap()[..]).unwrap(),
1872                                                 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
1873                                         },
1874                                         RouteHop {
1875                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("027f31ebc5462c1fdce1b737ecff52d37d75dea43ce11c74d25aa297165faa2007").unwrap()[..]).unwrap(),
1876                                                 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
1877                                         },
1878                                         RouteHop {
1879                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]).unwrap(),
1880                                                 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
1881                                         },
1882                                         RouteHop {
1883                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("02edabbd16b41c8371b92ef2f04c1185b4f03b6dcd52ba9b78d9d7c89c8f221145").unwrap()[..]).unwrap(),
1884                                                 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
1885                                         },
1886                         ),
1887                 };
1888
1889                 let session_priv = SecretKey::from_slice(&secp_ctx, &hex_bytes("4141414141414141414141414141414141414141414141414141414141414141").unwrap()[..]).unwrap();
1890
1891                 let onion_keys = ChannelManager::construct_onion_keys(&secp_ctx, &route, &session_priv).unwrap();
1892                 assert_eq!(onion_keys.len(), route.hops.len());
1893                 onion_keys
1894         }
1895
1896         #[test]
1897         fn onion_vectors() {
1898                 // Packet creation test vectors from BOLT 4
1899                 let onion_keys = build_test_onion_keys();
1900
1901                 assert_eq!(onion_keys[0].shared_secret[..], hex_bytes("53eb63ea8a3fec3b3cd433b85cd62a4b145e1dda09391b348c4e1cd36a03ea66").unwrap()[..]);
1902                 assert_eq!(onion_keys[0].blinding_factor[..], hex_bytes("2ec2e5da605776054187180343287683aa6a51b4b1c04d6dd49c45d8cffb3c36").unwrap()[..]);
1903                 assert_eq!(onion_keys[0].ephemeral_pubkey.serialize()[..], hex_bytes("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]);
1904                 assert_eq!(onion_keys[0].rho, hex_bytes("ce496ec94def95aadd4bec15cdb41a740c9f2b62347c4917325fcc6fb0453986").unwrap()[..]);
1905                 assert_eq!(onion_keys[0].mu, hex_bytes("b57061dc6d0a2b9f261ac410c8b26d64ac5506cbba30267a649c28c179400eba").unwrap()[..]);
1906
1907                 assert_eq!(onion_keys[1].shared_secret[..], hex_bytes("a6519e98832a0b179f62123b3567c106db99ee37bef036e783263602f3488fae").unwrap()[..]);
1908                 assert_eq!(onion_keys[1].blinding_factor[..], hex_bytes("bf66c28bc22e598cfd574a1931a2bafbca09163df2261e6d0056b2610dab938f").unwrap()[..]);
1909                 assert_eq!(onion_keys[1].ephemeral_pubkey.serialize()[..], hex_bytes("028f9438bfbf7feac2e108d677e3a82da596be706cc1cf342b75c7b7e22bf4e6e2").unwrap()[..]);
1910                 assert_eq!(onion_keys[1].rho, hex_bytes("450ffcabc6449094918ebe13d4f03e433d20a3d28a768203337bc40b6e4b2c59").unwrap()[..]);
1911                 assert_eq!(onion_keys[1].mu, hex_bytes("05ed2b4a3fb023c2ff5dd6ed4b9b6ea7383f5cfe9d59c11d121ec2c81ca2eea9").unwrap()[..]);
1912
1913                 assert_eq!(onion_keys[2].shared_secret[..], hex_bytes("3a6b412548762f0dbccce5c7ae7bb8147d1caf9b5471c34120b30bc9c04891cc").unwrap()[..]);
1914                 assert_eq!(onion_keys[2].blinding_factor[..], hex_bytes("a1f2dadd184eb1627049673f18c6325814384facdee5bfd935d9cb031a1698a5").unwrap()[..]);
1915                 assert_eq!(onion_keys[2].ephemeral_pubkey.serialize()[..], hex_bytes("03bfd8225241ea71cd0843db7709f4c222f62ff2d4516fd38b39914ab6b83e0da0").unwrap()[..]);
1916                 assert_eq!(onion_keys[2].rho, hex_bytes("11bf5c4f960239cb37833936aa3d02cea82c0f39fd35f566109c41f9eac8deea").unwrap()[..]);
1917                 assert_eq!(onion_keys[2].mu, hex_bytes("caafe2820fa00eb2eeb78695ae452eba38f5a53ed6d53518c5c6edf76f3f5b78").unwrap()[..]);
1918
1919                 assert_eq!(onion_keys[3].shared_secret[..], hex_bytes("21e13c2d7cfe7e18836df50872466117a295783ab8aab0e7ecc8c725503ad02d").unwrap()[..]);
1920                 assert_eq!(onion_keys[3].blinding_factor[..], hex_bytes("7cfe0b699f35525029ae0fa437c69d0f20f7ed4e3916133f9cacbb13c82ff262").unwrap()[..]);
1921                 assert_eq!(onion_keys[3].ephemeral_pubkey.serialize()[..], hex_bytes("031dde6926381289671300239ea8e57ffaf9bebd05b9a5b95beaf07af05cd43595").unwrap()[..]);
1922                 assert_eq!(onion_keys[3].rho, hex_bytes("cbe784ab745c13ff5cffc2fbe3e84424aa0fd669b8ead4ee562901a4a4e89e9e").unwrap()[..]);
1923                 assert_eq!(onion_keys[3].mu, hex_bytes("5052aa1b3d9f0655a0932e50d42f0c9ba0705142c25d225515c45f47c0036ee9").unwrap()[..]);
1924
1925                 assert_eq!(onion_keys[4].shared_secret[..], hex_bytes("b5756b9b542727dbafc6765a49488b023a725d631af688fc031217e90770c328").unwrap()[..]);
1926                 assert_eq!(onion_keys[4].blinding_factor[..], hex_bytes("c96e00dddaf57e7edcd4fb5954be5b65b09f17cb6d20651b4e90315be5779205").unwrap()[..]);
1927                 assert_eq!(onion_keys[4].ephemeral_pubkey.serialize()[..], hex_bytes("03a214ebd875aab6ddfd77f22c5e7311d7f77f17a169e599f157bbcdae8bf071f4").unwrap()[..]);
1928                 assert_eq!(onion_keys[4].rho, hex_bytes("034e18b8cc718e8af6339106e706c52d8df89e2b1f7e9142d996acf88df8799b").unwrap()[..]);
1929                 assert_eq!(onion_keys[4].mu, hex_bytes("8e45e5c61c2b24cb6382444db6698727afb063adecd72aada233d4bf273d975a").unwrap()[..]);
1930
1931                 // Test vectors below are flat-out wrong: they claim to set outgoing_cltv_value to non-0 :/
1932                 let payloads = vec!(
1933                         msgs::OnionHopData {
1934                                 realm: 0,
1935                                 data: msgs::OnionRealm0HopData {
1936                                         short_channel_id: 0,
1937                                         amt_to_forward: 0,
1938                                         outgoing_cltv_value: 0,
1939                                 },
1940                                 hmac: [0; 32],
1941                         },
1942                         msgs::OnionHopData {
1943                                 realm: 0,
1944                                 data: msgs::OnionRealm0HopData {
1945                                         short_channel_id: 0x0101010101010101,
1946                                         amt_to_forward: 0x0100000001,
1947                                         outgoing_cltv_value: 0,
1948                                 },
1949                                 hmac: [0; 32],
1950                         },
1951                         msgs::OnionHopData {
1952                                 realm: 0,
1953                                 data: msgs::OnionRealm0HopData {
1954                                         short_channel_id: 0x0202020202020202,
1955                                         amt_to_forward: 0x0200000002,
1956                                         outgoing_cltv_value: 0,
1957                                 },
1958                                 hmac: [0; 32],
1959                         },
1960                         msgs::OnionHopData {
1961                                 realm: 0,
1962                                 data: msgs::OnionRealm0HopData {
1963                                         short_channel_id: 0x0303030303030303,
1964                                         amt_to_forward: 0x0300000003,
1965                                         outgoing_cltv_value: 0,
1966                                 },
1967                                 hmac: [0; 32],
1968                         },
1969                         msgs::OnionHopData {
1970                                 realm: 0,
1971                                 data: msgs::OnionRealm0HopData {
1972                                         short_channel_id: 0x0404040404040404,
1973                                         amt_to_forward: 0x0400000004,
1974                                         outgoing_cltv_value: 0,
1975                                 },
1976                                 hmac: [0; 32],
1977                         },
1978                 );
1979
1980                 let packet = ChannelManager::construct_onion_packet(payloads, onion_keys, hex_bytes("4242424242424242424242424242424242424242424242424242424242424242").unwrap()).unwrap();
1981                 // Just check the final packet encoding, as it includes all the per-hop vectors in it
1982                 // anyway...
1983                 assert_eq!(packet.encode(), hex_bytes("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").unwrap());
1984         }
1985
1986         #[test]
1987         fn test_failure_packet_onion() {
1988                 // Returning Errors test vectors from BOLT 4
1989
1990                 let onion_keys = build_test_onion_keys();
1991                 let onion_error = ChannelManager::build_failure_packet(&onion_keys[4].shared_secret, 0x2002, &[0; 0]);
1992                 assert_eq!(onion_error.encode(), hex_bytes("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").unwrap());
1993
1994                 let onion_packet_1 = ChannelManager::encrypt_failure_packet(&onion_keys[4].shared_secret, &onion_error.encode()[..]);
1995                 assert_eq!(onion_packet_1.data, hex_bytes("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").unwrap());
1996
1997                 let onion_packet_2 = ChannelManager::encrypt_failure_packet(&onion_keys[3].shared_secret, &onion_packet_1.data[..]);
1998                 assert_eq!(onion_packet_2.data, hex_bytes("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").unwrap());
1999
2000                 let onion_packet_3 = ChannelManager::encrypt_failure_packet(&onion_keys[2].shared_secret, &onion_packet_2.data[..]);
2001                 assert_eq!(onion_packet_3.data, hex_bytes("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").unwrap());
2002
2003                 let onion_packet_4 = ChannelManager::encrypt_failure_packet(&onion_keys[1].shared_secret, &onion_packet_3.data[..]);
2004                 assert_eq!(onion_packet_4.data, hex_bytes("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").unwrap());
2005
2006                 let onion_packet_5 = ChannelManager::encrypt_failure_packet(&onion_keys[0].shared_secret, &onion_packet_4.data[..]);
2007                 assert_eq!(onion_packet_5.data, hex_bytes("9c5add3963fc7f6ed7f148623c84134b5647e1306419dbe2174e523fa9e2fbed3a06a19f899145610741c83ad40b7712aefaddec8c6baf7325d92ea4ca4d1df8bce517f7e54554608bf2bd8071a4f52a7a2f7ffbb1413edad81eeea5785aa9d990f2865dc23b4bc3c301a94eec4eabebca66be5cf638f693ec256aec514620cc28ee4a94bd9565bc4d4962b9d3641d4278fb319ed2b84de5b665f307a2db0f7fbb757366067d88c50f7e829138fde4f78d39b5b5802f1b92a8a820865af5cc79f9f30bc3f461c66af95d13e5e1f0381c184572a91dee1c849048a647a1158cf884064deddbf1b0b88dfe2f791428d0ba0f6fb2f04e14081f69165ae66d9297c118f0907705c9c4954a199bae0bb96fad763d690e7daa6cfda59ba7f2c8d11448b604d12d").unwrap());
2008         }
2009
2010         fn confirm_transaction(chain: &chaininterface::ChainWatchInterfaceUtil, tx: &Transaction, chan_id: u32) {
2011                 assert!(chain.does_match_tx(tx));
2012                 let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2013                 chain.block_connected_checked(&header, 1, &[tx; 1], &[chan_id; 1]);
2014                 for i in 2..100 {
2015                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2016                         chain.block_connected_checked(&header, i, &[tx; 0], &[0; 0]);
2017                 }
2018         }
2019
2020         struct Node {
2021                 feeest: Arc<test_utils::TestFeeEstimator>,
2022                 chain_monitor: Arc<chaininterface::ChainWatchInterfaceUtil>,
2023                 tx_broadcaster: Arc<test_utils::TestBroadcaster>,
2024                 chan_monitor: Arc<test_utils::TestChannelMonitor>,
2025                 node_id: SecretKey,
2026                 node: Arc<ChannelManager>,
2027                 router: Router,
2028         }
2029
2030         static mut CHAN_COUNT: u32 = 0;
2031         fn create_chan_between_nodes(node_a: &Node, node_b: &Node) -> (msgs::ChannelAnnouncement, msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction) {
2032                 node_a.node.create_channel(node_b.node.get_our_node_id(), 100000, 42).unwrap();
2033
2034                 let events_1 = node_a.node.get_and_clear_pending_events();
2035                 assert_eq!(events_1.len(), 1);
2036                 let accept_chan = match events_1[0] {
2037                         Event::SendOpenChannel { ref node_id, ref msg } => {
2038                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2039                                 node_b.node.handle_open_channel(&node_a.node.get_our_node_id(), msg).unwrap()
2040                         },
2041                         _ => panic!("Unexpected event"),
2042                 };
2043
2044                 node_a.node.handle_accept_channel(&node_b.node.get_our_node_id(), &accept_chan).unwrap();
2045
2046                 let chan_id = unsafe { CHAN_COUNT };
2047                 let tx;
2048                 let funding_output;
2049
2050                 let events_2 = node_a.node.get_and_clear_pending_events();
2051                 assert_eq!(events_2.len(), 1);
2052                 match events_2[0] {
2053                         Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, user_channel_id } => {
2054                                 assert_eq!(*channel_value_satoshis, 100000);
2055                                 assert_eq!(user_channel_id, 42);
2056
2057                                 tx = Transaction { version: chan_id as u32, lock_time: 0, input: Vec::new(), output: vec![TxOut {
2058                                         value: *channel_value_satoshis, script_pubkey: output_script.clone(),
2059                                 }]};
2060                                 funding_output = OutPoint::new(Sha256dHash::from_data(&serialize(&tx).unwrap()[..]), 0);
2061
2062                                 node_a.node.funding_transaction_generated(&temporary_channel_id, funding_output);
2063                                 let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
2064                                 assert_eq!(added_monitors.len(), 1);
2065                                 assert_eq!(added_monitors[0].0, funding_output);
2066                                 added_monitors.clear();
2067                         },
2068                         _ => panic!("Unexpected event"),
2069                 }
2070
2071                 let events_3 = node_a.node.get_and_clear_pending_events();
2072                 assert_eq!(events_3.len(), 1);
2073                 let funding_signed = match events_3[0] {
2074                         Event::SendFundingCreated { ref node_id, ref msg } => {
2075                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2076                                 let res = node_b.node.handle_funding_created(&node_a.node.get_our_node_id(), msg).unwrap();
2077                                 let mut added_monitors = node_b.chan_monitor.added_monitors.lock().unwrap();
2078                                 assert_eq!(added_monitors.len(), 1);
2079                                 assert_eq!(added_monitors[0].0, funding_output);
2080                                 added_monitors.clear();
2081                                 res
2082                         },
2083                         _ => panic!("Unexpected event"),
2084                 };
2085
2086                 node_a.node.handle_funding_signed(&node_b.node.get_our_node_id(), &funding_signed).unwrap();
2087                 {
2088                         let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
2089                         assert_eq!(added_monitors.len(), 1);
2090                         assert_eq!(added_monitors[0].0, funding_output);
2091                         added_monitors.clear();
2092                 }
2093
2094                 let events_4 = node_a.node.get_and_clear_pending_events();
2095                 assert_eq!(events_4.len(), 1);
2096                 match events_4[0] {
2097                         Event::FundingBroadcastSafe { ref funding_txo, user_channel_id } => {
2098                                 assert_eq!(user_channel_id, 42);
2099                                 assert_eq!(*funding_txo, funding_output);
2100                         },
2101                         _ => panic!("Unexpected event"),
2102                 };
2103
2104                 confirm_transaction(&node_a.chain_monitor, &tx, chan_id);
2105                 let events_5 = node_a.node.get_and_clear_pending_events();
2106                 assert_eq!(events_5.len(), 1);
2107                 match events_5[0] {
2108                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
2109                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2110                                 assert!(announcement_sigs.is_none());
2111                                 node_b.node.handle_funding_locked(&node_a.node.get_our_node_id(), msg).unwrap()
2112                         },
2113                         _ => panic!("Unexpected event"),
2114                 };
2115
2116                 let channel_id;
2117
2118                 confirm_transaction(&node_b.chain_monitor, &tx, chan_id);
2119                 let events_6 = node_b.node.get_and_clear_pending_events();
2120                 assert_eq!(events_6.len(), 1);
2121                 let as_announcement_sigs = match events_6[0] {
2122                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
2123                                 assert_eq!(*node_id, node_a.node.get_our_node_id());
2124                                 channel_id = msg.channel_id.clone();
2125                                 let as_announcement_sigs = node_a.node.handle_funding_locked(&node_b.node.get_our_node_id(), msg).unwrap().unwrap();
2126                                 node_a.node.handle_announcement_signatures(&node_b.node.get_our_node_id(), &(*announcement_sigs).clone().unwrap()).unwrap();
2127                                 as_announcement_sigs
2128                         },
2129                         _ => panic!("Unexpected event"),
2130                 };
2131
2132                 let events_7 = node_a.node.get_and_clear_pending_events();
2133                 assert_eq!(events_7.len(), 1);
2134                 let (announcement, as_update) = match events_7[0] {
2135                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
2136                                 (msg, update_msg)
2137                         },
2138                         _ => panic!("Unexpected event"),
2139                 };
2140
2141                 node_b.node.handle_announcement_signatures(&node_a.node.get_our_node_id(), &as_announcement_sigs).unwrap();
2142                 let events_8 = node_b.node.get_and_clear_pending_events();
2143                 assert_eq!(events_8.len(), 1);
2144                 let bs_update = match events_8[0] {
2145                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
2146                                 assert!(*announcement == *msg);
2147                                 update_msg
2148                         },
2149                         _ => panic!("Unexpected event"),
2150                 };
2151
2152                 unsafe {
2153                         CHAN_COUNT += 1;
2154                 }
2155
2156                 ((*announcement).clone(), (*as_update).clone(), (*bs_update).clone(), channel_id, tx)
2157         }
2158
2159         fn create_announced_chan_between_nodes(nodes: &Vec<Node>, a: usize, b: usize) -> (msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction) {
2160                 let chan_announcement = create_chan_between_nodes(&nodes[a], &nodes[b]);
2161                 for node in nodes {
2162                         assert!(node.router.handle_channel_announcement(&chan_announcement.0).unwrap());
2163                         node.router.handle_channel_update(&chan_announcement.1).unwrap();
2164                         node.router.handle_channel_update(&chan_announcement.2).unwrap();
2165                 }
2166                 (chan_announcement.1, chan_announcement.2, chan_announcement.3, chan_announcement.4)
2167         }
2168
2169         fn close_channel(outbound_node: &Node, inbound_node: &Node, channel_id: &[u8; 32], funding_tx: Transaction, close_inbound_first: bool) -> (msgs::ChannelUpdate, msgs::ChannelUpdate) {
2170                 let (node_a, broadcaster_a) = if close_inbound_first { (&inbound_node.node, &inbound_node.tx_broadcaster) } else { (&outbound_node.node, &outbound_node.tx_broadcaster) };
2171                 let (node_b, broadcaster_b) = if close_inbound_first { (&outbound_node.node, &outbound_node.tx_broadcaster) } else { (&inbound_node.node, &inbound_node.tx_broadcaster) };
2172                 let (tx_a, tx_b);
2173
2174                 let shutdown_a = node_a.close_channel(channel_id).unwrap();
2175                 let (shutdown_b, mut closing_signed_b) = node_b.handle_shutdown(&node_a.get_our_node_id(), &shutdown_a).unwrap();
2176                 if !close_inbound_first {
2177                         assert!(closing_signed_b.is_none());
2178                 }
2179                 let (empty_a, mut closing_signed_a) = node_a.handle_shutdown(&node_b.get_our_node_id(), &shutdown_b.unwrap()).unwrap();
2180                 assert!(empty_a.is_none());
2181                 if close_inbound_first {
2182                         assert!(closing_signed_a.is_none());
2183                         closing_signed_a = node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
2184                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
2185                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
2186
2187                         let empty_b = node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
2188                         assert!(empty_b.is_none());
2189                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
2190                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
2191                 } else {
2192                         closing_signed_b = node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
2193                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
2194                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
2195
2196                         let empty_a2 = node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
2197                         assert!(empty_a2.is_none());
2198                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
2199                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
2200                 }
2201                 assert_eq!(tx_a, tx_b);
2202                 let mut funding_tx_map = HashMap::new();
2203                 funding_tx_map.insert(funding_tx.txid(), funding_tx);
2204                 tx_a.verify(&funding_tx_map).unwrap();
2205
2206                 let events_1 = node_a.get_and_clear_pending_events();
2207                 assert_eq!(events_1.len(), 1);
2208                 let as_update = match events_1[0] {
2209                         Event::BroadcastChannelUpdate { ref msg } => {
2210                                 msg.clone()
2211                         },
2212                         _ => panic!("Unexpected event"),
2213                 };
2214
2215                 let events_2 = node_b.get_and_clear_pending_events();
2216                 assert_eq!(events_2.len(), 1);
2217                 let bs_update = match events_2[0] {
2218                         Event::BroadcastChannelUpdate { ref msg } => {
2219                                 msg.clone()
2220                         },
2221                         _ => panic!("Unexpected event"),
2222                 };
2223
2224                 (as_update, bs_update)
2225         }
2226
2227         struct SendEvent {
2228                 node_id: PublicKey,
2229                 msgs: Vec<msgs::UpdateAddHTLC>,
2230                 commitment_msg: msgs::CommitmentSigned,
2231         }
2232         impl SendEvent {
2233                 fn from_event(event: Event) -> SendEvent {
2234                         match event {
2235                                 Event::SendHTLCs { node_id, msgs, commitment_msg } => {
2236                                         SendEvent { node_id: node_id, msgs: msgs, commitment_msg: commitment_msg }
2237                                 },
2238                                 _ => panic!("Unexpected event type!"),
2239                         }
2240                 }
2241         }
2242
2243         static mut PAYMENT_COUNT: u8 = 0;
2244         fn send_along_route(origin_node: &Node, route: Route, expected_route: &[&Node], recv_value: u64) -> ([u8; 32], [u8; 32]) {
2245                 let our_payment_preimage = unsafe { [PAYMENT_COUNT; 32] };
2246                 unsafe { PAYMENT_COUNT += 1 };
2247                 let our_payment_hash = {
2248                         let mut sha = Sha256::new();
2249                         sha.input(&our_payment_preimage[..]);
2250                         let mut ret = [0; 32];
2251                         sha.result(&mut ret);
2252                         ret
2253                 };
2254
2255                 let mut payment_event = {
2256                         origin_node.node.send_payment(route, our_payment_hash).unwrap();
2257                         {
2258                                 let mut added_monitors = origin_node.chan_monitor.added_monitors.lock().unwrap();
2259                                 assert_eq!(added_monitors.len(), 1);
2260                                 added_monitors.clear();
2261                         }
2262
2263                         let mut events = origin_node.node.get_and_clear_pending_events();
2264                         assert_eq!(events.len(), 1);
2265                         SendEvent::from_event(events.remove(0))
2266                 };
2267                 let mut prev_node = origin_node;
2268
2269                 for (idx, &node) in expected_route.iter().enumerate() {
2270                         assert_eq!(node.node.get_our_node_id(), payment_event.node_id);
2271
2272                         node.node.handle_update_add_htlc(&prev_node.node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
2273                         {
2274                                 let added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2275                                 assert_eq!(added_monitors.len(), 0);
2276                         }
2277
2278                         let revoke_and_ack = node.node.handle_commitment_signed(&prev_node.node.get_our_node_id(), &payment_event.commitment_msg).unwrap();
2279                         {
2280                                 let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2281                                 assert_eq!(added_monitors.len(), 1);
2282                                 added_monitors.clear();
2283                         }
2284                         assert!(prev_node.node.handle_revoke_and_ack(&node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2285                         let prev_revoke_and_ack = prev_node.node.handle_commitment_signed(&node.node.get_our_node_id(), &revoke_and_ack.1.unwrap()).unwrap();
2286                         {
2287                                 let mut added_monitors = prev_node.chan_monitor.added_monitors.lock().unwrap();
2288                                 assert_eq!(added_monitors.len(), 2);
2289                                 added_monitors.clear();
2290                         }
2291                         assert!(node.node.handle_revoke_and_ack(&prev_node.node.get_our_node_id(), &prev_revoke_and_ack.0).unwrap().is_none());
2292                         assert!(prev_revoke_and_ack.1.is_none());
2293                         {
2294                                 let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2295                                 assert_eq!(added_monitors.len(), 1);
2296                                 added_monitors.clear();
2297                         }
2298
2299                         let events_1 = node.node.get_and_clear_pending_events();
2300                         assert_eq!(events_1.len(), 1);
2301                         match events_1[0] {
2302                                 Event::PendingHTLCsForwardable { .. } => { },
2303                                 _ => panic!("Unexpected event"),
2304                         };
2305
2306                         node.node.channel_state.lock().unwrap().next_forward = Instant::now();
2307                         node.node.process_pending_htlc_forward();
2308
2309                         let mut events_2 = node.node.get_and_clear_pending_events();
2310                         assert_eq!(events_2.len(), 1);
2311                         if idx == expected_route.len() - 1 {
2312                                 match events_2[0] {
2313                                         Event::PaymentReceived { ref payment_hash, amt } => {
2314                                                 assert_eq!(our_payment_hash, *payment_hash);
2315                                                 assert_eq!(amt, recv_value);
2316                                         },
2317                                         _ => panic!("Unexpected event"),
2318                                 }
2319                         } else {
2320                                 {
2321                                         let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2322                                         assert_eq!(added_monitors.len(), 1);
2323                                         added_monitors.clear();
2324                                 }
2325                                 payment_event = SendEvent::from_event(events_2.remove(0));
2326                                 assert_eq!(payment_event.msgs.len(), 1);
2327                         }
2328
2329                         prev_node = node;
2330                 }
2331
2332                 (our_payment_preimage, our_payment_hash)
2333         }
2334
2335         fn claim_payment(origin_node: &Node, expected_route: &[&Node], our_payment_preimage: [u8; 32]) {
2336                 assert!(expected_route.last().unwrap().node.claim_funds(our_payment_preimage));
2337                 {
2338                         let mut added_monitors = expected_route.last().unwrap().chan_monitor.added_monitors.lock().unwrap();
2339                         assert_eq!(added_monitors.len(), 1);
2340                         added_monitors.clear();
2341                 }
2342
2343                 let mut next_msgs: Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned)> = None;
2344                 macro_rules! update_fulfill_dance {
2345                         ($node: expr, $prev_node: expr, $last_node: expr) => {
2346                                 {
2347                                         $node.node.handle_update_fulfill_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
2348                                         {
2349                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2350                                                 if $last_node {
2351                                                         assert_eq!(added_monitors.len(), 1);
2352                                                 } else {
2353                                                         assert_eq!(added_monitors.len(), 2);
2354                                                         assert!(added_monitors[0].0 != added_monitors[1].0);
2355                                                 }
2356                                                 added_monitors.clear();
2357                                         }
2358                                         let revoke_and_commit = $node.node.handle_commitment_signed(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().1).unwrap();
2359                                         {
2360                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2361                                                 assert_eq!(added_monitors.len(), 1);
2362                                                 added_monitors.clear();
2363                                         }
2364                                         assert!($prev_node.node.handle_revoke_and_ack(&$node.node.get_our_node_id(), &revoke_and_commit.0).unwrap().is_none());
2365                                         let revoke_and_ack = $prev_node.node.handle_commitment_signed(&$node.node.get_our_node_id(), &revoke_and_commit.1.unwrap()).unwrap();
2366                                         assert!(revoke_and_ack.1.is_none());
2367                                         {
2368                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2369                                                 assert_eq!(added_monitors.len(), 2);
2370                                                 added_monitors.clear();
2371                                         }
2372                                         assert!($node.node.handle_revoke_and_ack(&$prev_node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2373                                         {
2374                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2375                                                 assert_eq!(added_monitors.len(), 1);
2376                                                 added_monitors.clear();
2377                                         }
2378                                 }
2379                         }
2380                 }
2381
2382                 let mut expected_next_node = expected_route.last().unwrap().node.get_our_node_id();
2383                 let mut prev_node = expected_route.last().unwrap();
2384                 for node in expected_route.iter().rev() {
2385                         assert_eq!(expected_next_node, node.node.get_our_node_id());
2386                         if next_msgs.is_some() {
2387                                 update_fulfill_dance!(node, prev_node, false);
2388                         }
2389
2390                         let events = node.node.get_and_clear_pending_events();
2391                         assert_eq!(events.len(), 1);
2392                         match events[0] {
2393                                 Event::SendFulfillHTLC { ref node_id, ref msg, ref commitment_msg } => {
2394                                         expected_next_node = node_id.clone();
2395                                         next_msgs = Some((msg.clone(), commitment_msg.clone()));
2396                                 },
2397                                 _ => panic!("Unexpected event"),
2398                         };
2399
2400                         prev_node = node;
2401                 }
2402
2403                 assert_eq!(expected_next_node, origin_node.node.get_our_node_id());
2404                 update_fulfill_dance!(origin_node, expected_route.first().unwrap(), true);
2405
2406                 let events = origin_node.node.get_and_clear_pending_events();
2407                 assert_eq!(events.len(), 1);
2408                 match events[0] {
2409                         Event::PaymentSent { payment_preimage } => {
2410                                 assert_eq!(payment_preimage, our_payment_preimage);
2411                         },
2412                         _ => panic!("Unexpected event"),
2413                 }
2414         }
2415
2416         const TEST_FINAL_CLTV: u32 = 32;
2417
2418         fn route_payment(origin_node: &Node, expected_route: &[&Node], recv_value: u64) -> ([u8; 32], [u8; 32]) {
2419                 let route = origin_node.router.get_route(&expected_route.last().unwrap().node.get_our_node_id(), &Vec::new(), recv_value, TEST_FINAL_CLTV).unwrap();
2420                 assert_eq!(route.hops.len(), expected_route.len());
2421                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
2422                         assert_eq!(hop.pubkey, node.node.get_our_node_id());
2423                 }
2424
2425                 send_along_route(origin_node, route, expected_route, recv_value)
2426         }
2427
2428         fn route_over_limit(origin_node: &Node, expected_route: &[&Node], recv_value: u64) {
2429                 let route = origin_node.router.get_route(&expected_route.last().unwrap().node.get_our_node_id(), &Vec::new(), recv_value, TEST_FINAL_CLTV).unwrap();
2430                 assert_eq!(route.hops.len(), expected_route.len());
2431                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
2432                         assert_eq!(hop.pubkey, node.node.get_our_node_id());
2433                 }
2434
2435                 let our_payment_preimage = unsafe { [PAYMENT_COUNT; 32] };
2436                 unsafe { PAYMENT_COUNT += 1 };
2437                 let our_payment_hash = {
2438                         let mut sha = Sha256::new();
2439                         sha.input(&our_payment_preimage[..]);
2440                         let mut ret = [0; 32];
2441                         sha.result(&mut ret);
2442                         ret
2443                 };
2444
2445                 let err = origin_node.node.send_payment(route, our_payment_hash).err().unwrap();
2446                 assert_eq!(err.err, "Cannot send value that would put us over our max HTLC value in flight");
2447         }
2448
2449         fn send_payment(origin: &Node, expected_route: &[&Node], recv_value: u64) {
2450                 let our_payment_preimage = route_payment(&origin, expected_route, recv_value).0;
2451                 claim_payment(&origin, expected_route, our_payment_preimage);
2452         }
2453
2454         fn fail_payment(origin_node: &Node, expected_route: &[&Node], our_payment_hash: [u8; 32]) {
2455                 assert!(expected_route.last().unwrap().node.fail_htlc_backwards(&our_payment_hash));
2456                 {
2457                         let mut added_monitors = expected_route.last().unwrap().chan_monitor.added_monitors.lock().unwrap();
2458                         assert_eq!(added_monitors.len(), 1);
2459                         added_monitors.clear();
2460                 }
2461
2462                 let mut next_msgs: Option<(msgs::UpdateFailHTLC, msgs::CommitmentSigned)> = None;
2463                 macro_rules! update_fail_dance {
2464                         ($node: expr, $prev_node: expr, $last_node: expr) => {
2465                                 {
2466                                         $node.node.handle_update_fail_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
2467                                         let revoke_and_commit = $node.node.handle_commitment_signed(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().1).unwrap();
2468
2469                                         {
2470                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2471                                                 assert_eq!(added_monitors.len(), 1);
2472                                                 added_monitors.clear();
2473                                         }
2474                                         assert!($prev_node.node.handle_revoke_and_ack(&$node.node.get_our_node_id(), &revoke_and_commit.0).unwrap().is_none());
2475                                         {
2476                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2477                                                 assert_eq!(added_monitors.len(), 1);
2478                                                 added_monitors.clear();
2479                                         }
2480                                         let revoke_and_ack = $prev_node.node.handle_commitment_signed(&$node.node.get_our_node_id(), &revoke_and_commit.1.unwrap()).unwrap();
2481                                         {
2482                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2483                                                 assert_eq!(added_monitors.len(), 1);
2484                                                 added_monitors.clear();
2485                                         }
2486                                         assert!(revoke_and_ack.1.is_none());
2487                                         assert!($node.node.get_and_clear_pending_events().is_empty());
2488                                         assert!($node.node.handle_revoke_and_ack(&$prev_node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2489                                         {
2490                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2491                                                 if $last_node {
2492                                                         assert_eq!(added_monitors.len(), 1);
2493                                                 } else {
2494                                                         assert_eq!(added_monitors.len(), 2);
2495                                                         assert!(added_monitors[0].0 != added_monitors[1].0);
2496                                                 }
2497                                                 added_monitors.clear();
2498                                         }
2499                                 }
2500                         }
2501                 }
2502
2503                 let mut expected_next_node = expected_route.last().unwrap().node.get_our_node_id();
2504                 let mut prev_node = expected_route.last().unwrap();
2505                 for node in expected_route.iter().rev() {
2506                         assert_eq!(expected_next_node, node.node.get_our_node_id());
2507                         if next_msgs.is_some() {
2508                                 update_fail_dance!(node, prev_node, false);
2509                         }
2510
2511                         let events = node.node.get_and_clear_pending_events();
2512                         assert_eq!(events.len(), 1);
2513                         match events[0] {
2514                                 Event::SendFailHTLC { ref node_id, ref msg, ref commitment_msg } => {
2515                                         expected_next_node = node_id.clone();
2516                                         next_msgs = Some((msg.clone(), commitment_msg.clone()));
2517                                 },
2518                                 _ => panic!("Unexpected event"),
2519                         };
2520
2521                         prev_node = node;
2522                 }
2523
2524                 assert_eq!(expected_next_node, origin_node.node.get_our_node_id());
2525                 update_fail_dance!(origin_node, expected_route.first().unwrap(), true);
2526
2527                 let events = origin_node.node.get_and_clear_pending_events();
2528                 assert_eq!(events.len(), 1);
2529                 match events[0] {
2530                         Event::PaymentFailed { payment_hash } => {
2531                                 assert_eq!(payment_hash, our_payment_hash);
2532                         },
2533                         _ => panic!("Unexpected event"),
2534                 }
2535         }
2536
2537         fn create_network(node_count: usize) -> Vec<Node> {
2538                 let mut nodes = Vec::new();
2539                 let mut rng = thread_rng();
2540                 let secp_ctx = Secp256k1::new();
2541
2542                 for _ in 0..node_count {
2543                         let feeest = Arc::new(test_utils::TestFeeEstimator { sat_per_vbyte: 1 });
2544                         let chain_monitor = Arc::new(chaininterface::ChainWatchInterfaceUtil::new());
2545                         let tx_broadcaster = Arc::new(test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new())});
2546                         let chan_monitor = Arc::new(test_utils::TestChannelMonitor::new(chain_monitor.clone(), tx_broadcaster.clone()));
2547                         let node_id = {
2548                                 let mut key_slice = [0; 32];
2549                                 rng.fill_bytes(&mut key_slice);
2550                                 SecretKey::from_slice(&secp_ctx, &key_slice).unwrap()
2551                         };
2552                         let node = ChannelManager::new(node_id.clone(), 0, true, Network::Testnet, feeest.clone(), chan_monitor.clone(), chain_monitor.clone(), tx_broadcaster.clone()).unwrap();
2553                         let router = Router::new(PublicKey::from_secret_key(&secp_ctx, &node_id).unwrap());
2554                         nodes.push(Node { feeest, chain_monitor, tx_broadcaster, chan_monitor, node_id, node, router });
2555                 }
2556
2557                 nodes
2558         }
2559
2560         #[test]
2561         fn fake_network_test() {
2562                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
2563                 // tests that payments get routed and transactions broadcast in semi-reasonable ways.
2564                 let nodes = create_network(4);
2565
2566                 // Create some initial channels
2567                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
2568                 let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2);
2569                 let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3);
2570
2571                 // Rebalance the network a bit by relaying one payment through all the channels...
2572                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2573                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2574                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2575                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2576
2577                 // Send some more payments
2578                 send_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 1000000);
2579                 send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1], &nodes[0])[..], 1000000);
2580                 send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1])[..], 1000000);
2581
2582                 // Test failure packets
2583                 let payment_hash_1 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 1000000).1;
2584                 fail_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], payment_hash_1);
2585
2586                 // Add a new channel that skips 3
2587                 let chan_4 = create_announced_chan_between_nodes(&nodes, 1, 3);
2588
2589                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 1000000);
2590                 send_payment(&nodes[2], &vec!(&nodes[3])[..], 1000000);
2591                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2592                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2593                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2594                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2595                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2596
2597                 // Do some rebalance loop payments, simultaneously
2598                 let mut hops = Vec::with_capacity(3);
2599                 hops.push(RouteHop {
2600                         pubkey: nodes[2].node.get_our_node_id(),
2601                         short_channel_id: chan_2.0.contents.short_channel_id,
2602                         fee_msat: 0,
2603                         cltv_expiry_delta: chan_3.0.contents.cltv_expiry_delta as u32
2604                 });
2605                 hops.push(RouteHop {
2606                         pubkey: nodes[3].node.get_our_node_id(),
2607                         short_channel_id: chan_3.0.contents.short_channel_id,
2608                         fee_msat: 0,
2609                         cltv_expiry_delta: chan_4.1.contents.cltv_expiry_delta as u32
2610                 });
2611                 hops.push(RouteHop {
2612                         pubkey: nodes[1].node.get_our_node_id(),
2613                         short_channel_id: chan_4.0.contents.short_channel_id,
2614                         fee_msat: 1000000,
2615                         cltv_expiry_delta: TEST_FINAL_CLTV,
2616                 });
2617                 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;
2618                 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;
2619                 let payment_preimage_1 = send_along_route(&nodes[1], Route { hops }, &vec!(&nodes[2], &nodes[3], &nodes[1])[..], 1000000).0;
2620
2621                 let mut hops = Vec::with_capacity(3);
2622                 hops.push(RouteHop {
2623                         pubkey: nodes[3].node.get_our_node_id(),
2624                         short_channel_id: chan_4.0.contents.short_channel_id,
2625                         fee_msat: 0,
2626                         cltv_expiry_delta: chan_3.1.contents.cltv_expiry_delta as u32
2627                 });
2628                 hops.push(RouteHop {
2629                         pubkey: nodes[2].node.get_our_node_id(),
2630                         short_channel_id: chan_3.0.contents.short_channel_id,
2631                         fee_msat: 0,
2632                         cltv_expiry_delta: chan_2.1.contents.cltv_expiry_delta as u32
2633                 });
2634                 hops.push(RouteHop {
2635                         pubkey: nodes[1].node.get_our_node_id(),
2636                         short_channel_id: chan_2.0.contents.short_channel_id,
2637                         fee_msat: 1000000,
2638                         cltv_expiry_delta: TEST_FINAL_CLTV,
2639                 });
2640                 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;
2641                 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;
2642                 let payment_hash_2 = send_along_route(&nodes[1], Route { hops }, &vec!(&nodes[3], &nodes[2], &nodes[1])[..], 1000000).1;
2643
2644                 // Claim the rebalances...
2645                 fail_payment(&nodes[1], &vec!(&nodes[3], &nodes[2], &nodes[1])[..], payment_hash_2);
2646                 claim_payment(&nodes[1], &vec!(&nodes[2], &nodes[3], &nodes[1])[..], payment_preimage_1);
2647
2648                 // Add a duplicate new channel from 2 to 4
2649                 let chan_5 = create_announced_chan_between_nodes(&nodes, 1, 3);
2650
2651                 // Send some payments across both channels
2652                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2653                 let payment_preimage_4 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2654                 let payment_preimage_5 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2655
2656                 route_over_limit(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000);
2657
2658                 //TODO: Test that routes work again here as we've been notified that the channel is full
2659
2660                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_3);
2661                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_4);
2662                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_5);
2663
2664                 // Close down the channels...
2665                 close_channel(&nodes[0], &nodes[1], &chan_1.2, chan_1.3, true);
2666                 close_channel(&nodes[1], &nodes[2], &chan_2.2, chan_2.3, false);
2667                 close_channel(&nodes[2], &nodes[3], &chan_3.2, chan_3.3, true);
2668                 close_channel(&nodes[1], &nodes[3], &chan_4.2, chan_4.3, false);
2669                 close_channel(&nodes[1], &nodes[3], &chan_5.2, chan_5.3, false);
2670
2671                 // Check that we processed all pending events
2672                 for node in nodes {
2673                         assert_eq!(node.node.get_and_clear_pending_events().len(), 0);
2674                         assert_eq!(node.chan_monitor.added_monitors.lock().unwrap().len(), 0);
2675                 }
2676         }
2677
2678         #[derive(PartialEq)]
2679         enum HTLCType { NONE, TIMEOUT, SUCCESS }
2680         fn test_txn_broadcast(node: &Node, chan: &(msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction), commitment_tx: Option<Transaction>, has_htlc_tx: HTLCType) -> Vec<Transaction> {
2681                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
2682                 assert!(node_txn.len() >= if commitment_tx.is_some() { 0 } else { 1 } + if has_htlc_tx == HTLCType::NONE { 0 } else { 1 });
2683
2684                 let mut res = Vec::with_capacity(2);
2685
2686                 if let Some(explicit_tx) = commitment_tx {
2687                         res.push(explicit_tx.clone());
2688                 } else {
2689                         for tx in node_txn.iter() {
2690                                 if tx.input.len() == 1 && tx.input[0].prev_hash == chan.3.txid() {
2691                                         let mut funding_tx_map = HashMap::new();
2692                                         funding_tx_map.insert(chan.3.txid(), chan.3.clone());
2693                                         tx.verify(&funding_tx_map).unwrap();
2694                                         res.push(tx.clone());
2695                                 }
2696                         }
2697                 }
2698                 assert_eq!(res.len(), 1);
2699
2700                 if has_htlc_tx != HTLCType::NONE {
2701                         for tx in node_txn.iter() {
2702                                 if tx.input.len() == 1 && tx.input[0].prev_hash == res[0].txid() {
2703                                         let mut funding_tx_map = HashMap::new();
2704                                         funding_tx_map.insert(res[0].txid(), res[0].clone());
2705                                         tx.verify(&funding_tx_map).unwrap();
2706                                         if has_htlc_tx == HTLCType::TIMEOUT {
2707                                                 assert!(tx.lock_time != 0);
2708                                         } else {
2709                                                 assert!(tx.lock_time == 0);
2710                                         }
2711                                         res.push(tx.clone());
2712                                         break;
2713                                 }
2714                         }
2715                         assert_eq!(res.len(), 2);
2716                 }
2717                 node_txn.clear();
2718                 res
2719         }
2720
2721         fn check_preimage_claim(node: &Node, prev_txn: &Vec<Transaction>) -> Vec<Transaction> {
2722                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
2723
2724                 assert!(node_txn.len() >= 1);
2725                 assert_eq!(node_txn[0].input.len(), 1);
2726                 let mut found_prev = false;
2727
2728                 for tx in prev_txn {
2729                         if node_txn[0].input[0].prev_hash == tx.txid() {
2730                                 let mut funding_tx_map = HashMap::new();
2731                                 funding_tx_map.insert(tx.txid(), tx.clone());
2732                                 node_txn[0].verify(&funding_tx_map).unwrap();
2733
2734                                 assert!(node_txn[0].input[0].witness[2].len() > 106); // must spend an htlc output
2735                                 assert_eq!(tx.input.len(), 1); // must spend a commitment tx
2736
2737                                 found_prev = true;
2738                                 break;
2739                         }
2740                 }
2741                 assert!(found_prev);
2742
2743                 let mut res = Vec::new();
2744                 mem::swap(&mut *node_txn, &mut res);
2745                 res
2746         }
2747
2748         fn get_announce_close_broadcast_events(nodes: &Vec<Node>, a: usize, b: usize) {
2749                 let events_1 = nodes[a].node.get_and_clear_pending_events();
2750                 assert_eq!(events_1.len(), 1);
2751                 let as_update = match events_1[0] {
2752                         Event::BroadcastChannelUpdate { ref msg } => {
2753                                 msg.clone()
2754                         },
2755                         _ => panic!("Unexpected event"),
2756                 };
2757
2758                 let events_2 = nodes[b].node.get_and_clear_pending_events();
2759                 assert_eq!(events_2.len(), 1);
2760                 let bs_update = match events_2[0] {
2761                         Event::BroadcastChannelUpdate { ref msg } => {
2762                                 msg.clone()
2763                         },
2764                         _ => panic!("Unexpected event"),
2765                 };
2766
2767                 for node in nodes {
2768                         node.router.handle_channel_update(&as_update).unwrap();
2769                         node.router.handle_channel_update(&bs_update).unwrap();
2770                 }
2771         }
2772
2773         #[test]
2774         fn channel_monitor_network_test() {
2775                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
2776                 // tests that ChannelMonitor is able to recover from various states.
2777                 let nodes = create_network(5);
2778
2779                 // Create some initial channels
2780                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
2781                 let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2);
2782                 let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3);
2783                 let chan_4 = create_announced_chan_between_nodes(&nodes, 3, 4);
2784
2785                 // Rebalance the network a bit by relaying one payment through all the channels...
2786                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2787                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2788                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2789                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2790
2791                 // Simple case with no pending HTLCs:
2792                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), true);
2793                 {
2794                         let mut node_txn = test_txn_broadcast(&nodes[1], &chan_1, None, HTLCType::NONE);
2795                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2796                         nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn.drain(..).next().unwrap()] }, 1);
2797                         assert_eq!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().len(), 0);
2798                 }
2799                 get_announce_close_broadcast_events(&nodes, 0, 1);
2800                 assert_eq!(nodes[0].node.list_channels().len(), 0);
2801                 assert_eq!(nodes[1].node.list_channels().len(), 1);
2802
2803                 // One pending HTLC is discarded by the force-close:
2804                 let payment_preimage_1 = route_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 3000000).0;
2805
2806                 // Simple case of one pending HTLC to HTLC-Timeout
2807                 nodes[1].node.peer_disconnected(&nodes[2].node.get_our_node_id(), true);
2808                 {
2809                         let mut node_txn = test_txn_broadcast(&nodes[1], &chan_2, None, HTLCType::TIMEOUT);
2810                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2811                         nodes[2].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn.drain(..).next().unwrap()] }, 1);
2812                         assert_eq!(nodes[2].tx_broadcaster.txn_broadcasted.lock().unwrap().len(), 0);
2813                 }
2814                 get_announce_close_broadcast_events(&nodes, 1, 2);
2815                 assert_eq!(nodes[1].node.list_channels().len(), 0);
2816                 assert_eq!(nodes[2].node.list_channels().len(), 1);
2817
2818                 macro_rules! claim_funds {
2819                         ($node: expr, $prev_node: expr, $preimage: expr) => {
2820                                 {
2821                                         assert!($node.node.claim_funds($preimage));
2822                                         {
2823                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2824                                                 assert_eq!(added_monitors.len(), 1);
2825                                                 added_monitors.clear();
2826                                         }
2827
2828                                         let events = $node.node.get_and_clear_pending_events();
2829                                         assert_eq!(events.len(), 1);
2830                                         match events[0] {
2831                                                 Event::SendFulfillHTLC { ref node_id, .. } => {
2832                                                         assert_eq!(*node_id, $prev_node.node.get_our_node_id());
2833                                                 },
2834                                                 _ => panic!("Unexpected event"),
2835                                         };
2836                                 }
2837                         }
2838                 }
2839
2840                 // nodes[3] gets the preimage, but nodes[2] already disconnected, resulting in a nodes[2]
2841                 // HTLC-Timeout and a nodes[3] claim against it (+ its own announces)
2842                 nodes[2].node.peer_disconnected(&nodes[3].node.get_our_node_id(), true);
2843                 {
2844                         let node_txn = test_txn_broadcast(&nodes[2], &chan_3, None, HTLCType::TIMEOUT);
2845
2846                         // Claim the payment on nodes[3], giving it knowledge of the preimage
2847                         claim_funds!(nodes[3], nodes[2], payment_preimage_1);
2848
2849                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2850                         nodes[3].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[0].clone()] }, 1);
2851
2852                         check_preimage_claim(&nodes[3], &node_txn);
2853                 }
2854                 get_announce_close_broadcast_events(&nodes, 2, 3);
2855                 assert_eq!(nodes[2].node.list_channels().len(), 0);
2856                 assert_eq!(nodes[3].node.list_channels().len(), 1);
2857
2858                 // One pending HTLC to time out:
2859                 let payment_preimage_2 = route_payment(&nodes[3], &vec!(&nodes[4])[..], 3000000).0;
2860
2861                 {
2862                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2863                         nodes[3].chain_monitor.block_connected_checked(&header, 1, &Vec::new()[..], &[0; 0]);
2864                         for i in 2..TEST_FINAL_CLTV - 5 {
2865                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2866                                 nodes[3].chain_monitor.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
2867                         }
2868
2869                         let node_txn = test_txn_broadcast(&nodes[3], &chan_4, None, HTLCType::TIMEOUT);
2870
2871                         // Claim the payment on nodes[3], giving it knowledge of the preimage
2872                         claim_funds!(nodes[4], nodes[3], payment_preimage_2);
2873
2874                         header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2875                         nodes[4].chain_monitor.block_connected_checked(&header, 1, &Vec::new()[..], &[0; 0]);
2876                         for i in 2..TEST_FINAL_CLTV - 5 {
2877                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2878                                 nodes[4].chain_monitor.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
2879                         }
2880
2881                         test_txn_broadcast(&nodes[4], &chan_4, None, HTLCType::SUCCESS);
2882
2883                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2884                         nodes[4].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[0].clone()] }, TEST_FINAL_CLTV - 5);
2885
2886                         check_preimage_claim(&nodes[4], &node_txn);
2887                 }
2888                 get_announce_close_broadcast_events(&nodes, 3, 4);
2889                 assert_eq!(nodes[3].node.list_channels().len(), 0);
2890                 assert_eq!(nodes[4].node.list_channels().len(), 0);
2891
2892                 // Create some new channels:
2893                 let chan_5 = create_announced_chan_between_nodes(&nodes, 0, 1);
2894
2895                 // A pending HTLC which will be revoked:
2896                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
2897                 // Get the will-be-revoked local txn from nodes[0]
2898                 let revoked_local_txn = nodes[0].node.channel_state.lock().unwrap().by_id.iter().next().unwrap().1.last_local_commitment_txn.clone();
2899                 // Revoke the old state
2900                 claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage_3);
2901
2902                 {
2903                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2904                         nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
2905                         {
2906                                 let mut node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
2907                                 assert_eq!(node_txn.len(), 1);
2908                                 assert_eq!(node_txn[0].input.len(), 1);
2909
2910                                 let mut funding_tx_map = HashMap::new();
2911                                 funding_tx_map.insert(revoked_local_txn[0].txid(), revoked_local_txn[0].clone());
2912                                 node_txn[0].verify(&funding_tx_map).unwrap();
2913                                 node_txn.clear();
2914                         }
2915
2916                         nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
2917                         let node_txn = test_txn_broadcast(&nodes[0], &chan_5, Some(revoked_local_txn[0].clone()), HTLCType::TIMEOUT);
2918                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2919                         nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[1].clone()] }, 1);
2920
2921                         //TODO: At this point nodes[1] should claim the revoked HTLC-Timeout output, but that's
2922                         //not yet implemented in ChannelMonitor
2923                 }
2924                 get_announce_close_broadcast_events(&nodes, 0, 1);
2925                 assert_eq!(nodes[0].node.list_channels().len(), 0);
2926                 assert_eq!(nodes[1].node.list_channels().len(), 0);
2927
2928                 // Check that we processed all pending events
2929                 for node in nodes {
2930                         assert_eq!(node.node.get_and_clear_pending_events().len(), 0);
2931                         assert_eq!(node.chan_monitor.added_monitors.lock().unwrap().len(), 0);
2932                 }
2933         }
2934
2935         #[test]
2936         fn test_unconf_chan() {
2937                 // After creating a chan between nodes, we disconnect all blocks previously seen to force a channel close on nodes[0] side
2938                 let nodes = create_network(2);
2939                 create_announced_chan_between_nodes(&nodes, 0, 1);
2940
2941                 let channel_state = nodes[0].node.channel_state.lock().unwrap();
2942                 assert_eq!(channel_state.by_id.len(), 1);
2943                 assert_eq!(channel_state.short_to_id.len(), 1);
2944                 mem::drop(channel_state);
2945
2946                 let mut headers = Vec::new();
2947                 let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2948                 headers.push(header.clone());
2949                 for _i in 2..100 {
2950                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2951                         headers.push(header.clone());
2952                 }
2953                 while !headers.is_empty() {
2954                         nodes[0].node.block_disconnected(&headers.pop().unwrap());
2955                 }
2956                 let channel_state = nodes[0].node.channel_state.lock().unwrap();
2957                 assert_eq!(channel_state.by_id.len(), 0);
2958                 assert_eq!(channel_state.short_to_id.len(), 0);
2959         }
2960 }