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

   1  use bitcoin::blockdata::block::BlockHeader;
   2 use bitcoin::blockdata::transaction::Transaction;
   3 use bitcoin::blockdata::constants::genesis_block;
   4 use bitcoin::network::constants::Network;
   5 use bitcoin::network::serialize::BitcoinHash;
   6 use bitcoin::util::hash::Sha256dHash;
   7 use bitcoin::util::uint::Uint256;
   8
   9 use secp256k1::key::{SecretKey,PublicKey};
  10 use secp256k1::{Secp256k1,Message};
  11 use secp256k1::ecdh::SharedSecret;
  12 use secp256k1;
  13
  14 use chain::chaininterface::{BroadcasterInterface,ChainListener,ChainWatchInterface,FeeEstimator};
  15 use chain::transaction::OutPoint;
  16 use ln::channel::{Channel, ChannelKeys};
  17 use ln::channelmonitor::ManyChannelMonitor;
  18 use ln::router::{Route,RouteHop};
  19 use ln::msgs;
  20 use ln::msgs::{HandleError,ChannelMessageHandler,MsgEncodable,MsgDecodable};
  21 use util::{byte_utils, events, internal_traits, rng};
  22 use util::sha2::Sha256;
  23
  24 use crypto;
  25 use crypto::mac::{Mac,MacResult};
  26 use crypto::hmac::Hmac;
  27 use crypto::digest::Digest;
  28 use crypto::symmetriccipher::SynchronousStreamCipher;
  29 use crypto::chacha20::ChaCha20;
  30
  31 use std::sync::{Mutex,MutexGuard,Arc};
  32 use std::collections::HashMap;
  33 use std::collections::hash_map;
  34 use std::{ptr, mem};
  35 use std::time::{Instant,Duration};
  36
  37 mod channel_held_info {
  38         use ln::msgs;
  39
  40         /// Stores the info we will need to send when we want to forward an HTLC onwards
  41         pub struct PendingForwardHTLCInfo {
  42                 pub(super) onion_packet: Option<msgs::OnionPacket>,
  43                 pub(super) payment_hash: [u8; 32],
  44                 pub(super) short_channel_id: u64,
  45                 pub(super) prev_short_channel_id: u64,
  46                 pub(super) amt_to_forward: u64,
  47                 pub(super) outgoing_cltv_value: u32,
  48         }
  49
  50         #[cfg(feature = "fuzztarget")]
  51         impl PendingForwardHTLCInfo {
  52                 pub fn dummy() -> Self {
  53                         Self {
  54                                 onion_packet: None,
  55                                 payment_hash: [0; 32],
  56                                 short_channel_id: 0,
  57                                 prev_short_channel_id: 0,
  58                                 amt_to_forward: 0,
  59                                 outgoing_cltv_value: 0,
  60                         }
  61                 }
  62         }
  63
  64         #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
  65         pub enum HTLCFailReason {
  66                 ErrorPacket {
  67                         err: msgs::OnionErrorPacket,
  68                 },
  69                 Reason {
  70                         failure_code: u16,
  71                         data: Vec<u8>,
  72                 }
  73         }
  74
  75         #[cfg(feature = "fuzztarget")]
  76         impl HTLCFailReason {
  77                 pub fn dummy() -> Self {
  78                         HTLCFailReason::Reason {
  79                                 failure_code: 0, data: Vec::new(),
  80                         }
  81                 }
  82         }
  83 }
  84 #[cfg(feature = "fuzztarget")]
  85 pub use self::channel_held_info::*;
  86 #[cfg(not(feature = "fuzztarget"))]
  87 pub(crate) use self::channel_held_info::*;
  88
  89 enum PendingOutboundHTLC {
  90         IntermediaryHopData {
  91                 source_short_channel_id: u64,
  92                 incoming_packet_shared_secret: SharedSecret,
  93         },
  94         OutboundRoute {
  95                 route: Route,
  96                 session_priv: SecretKey,
  97         },
  98         /// Used for channel rebalancing
  99         CycledRoute {
 100                 source_short_channel_id: u64,
 101                 incoming_packet_shared_secret: SharedSecret,
 102                 route: Route,
 103                 session_priv: SecretKey,
 104         }
 105 }
 106
 107 /// We hold back HTLCs we intend to relay for a random interval in the range (this, 5*this). This
 108 /// provides some limited amount of privacy. Ideally this would range from somewhere like 1 second
 109 /// to 30 seconds, but people expect lightning to be, you know, kinda fast, sadly. We could
 110 /// probably increase this significantly.
 111 const MIN_HTLC_RELAY_HOLDING_CELL_MILLIS: u32 = 50;
 112
 113 struct ChannelHolder {
 114         by_id: HashMap<Uint256, Channel>,
 115         short_to_id: HashMap<u64, Uint256>,
 116         next_forward: Instant,
 117         /// short channel id -> forward infos. Key of 0 means payments received
 118         forward_htlcs: HashMap<u64, Vec<PendingForwardHTLCInfo>>,
 119         claimable_htlcs: HashMap<[u8; 32], PendingOutboundHTLC>,
 120 }
 121 struct MutChannelHolder<'a> {
 122         by_id: &'a mut HashMap<Uint256, Channel>,
 123         short_to_id: &'a mut HashMap<u64, Uint256>,
 124         next_forward: &'a mut Instant,
 125         /// short channel id -> forward infos. Key of 0 means payments received
 126         forward_htlcs: &'a mut HashMap<u64, Vec<PendingForwardHTLCInfo>>,
 127         claimable_htlcs: &'a mut HashMap<[u8; 32], PendingOutboundHTLC>,
 128 }
 129 impl ChannelHolder {
 130         fn borrow_parts(&mut self) -> MutChannelHolder {
 131                 MutChannelHolder {
 132                         by_id: &mut self.by_id,
 133                         short_to_id: &mut self.short_to_id,
 134                         next_forward: &mut self.next_forward,
 135                         /// short channel id -> forward infos. Key of 0 means payments received
 136                         forward_htlcs: &mut self.forward_htlcs,
 137                         claimable_htlcs: &mut self.claimable_htlcs,
 138                 }
 139         }
 140 }
 141
 142 /// Manager which keeps track of a number of channels and sends messages to the appropriate
 143 /// channel, also tracking HTLC preimages and forwarding onion packets appropriately.
 144 /// Implements ChannelMessageHandler, handling the multi-channel parts and passing things through
 145 /// to individual Channels.
 146 pub struct ChannelManager {
 147         genesis_hash: Sha256dHash,
 148         fee_estimator: Arc<FeeEstimator>,
 149         monitor: Arc<ManyChannelMonitor>,
 150         chain_monitor: Arc<ChainWatchInterface>,
 151         tx_broadcaster: Arc<BroadcasterInterface>,
 152
 153         announce_channels_publicly: bool,
 154         fee_proportional_millionths: u32,
 155         secp_ctx: Secp256k1,
 156
 157         channel_state: Mutex<ChannelHolder>,
 158         our_network_key: SecretKey,
 159
 160         pending_events: Mutex<Vec<events::Event>>,
 161 }
 162
 163 const CLTV_EXPIRY_DELTA: u16 = 6 * 24 * 2; //TODO?
 164
 165 macro_rules! secp_call {
 166         ( $res : expr ) => {
 167                 match $res {
 168                         Ok(key) => key,
 169                         //TODO: Make the err a parameter!
 170                         Err(_) => return Err(HandleError{err: "Key error", msg: None})
 171                 }
 172         };
 173 }
 174
 175 struct OnionKeys {
 176         #[cfg(test)]
 177         shared_secret: SharedSecret,
 178         #[cfg(test)]
 179         blinding_factor: [u8; 32],
 180         ephemeral_pubkey: PublicKey,
 181         rho: [u8; 32],
 182         mu: [u8; 32],
 183 }
 184
 185 pub struct ChannelDetails {
 186         /// The channel's ID (prior to funding transaction generation, this is a random 32 bytes,
 187         /// thereafter this is the txid of the funding transaction xor the funding transaction output).
 188         /// Note that this means this value is *not* persistent - it can change once during the
 189         /// lifetime of the channel.
 190         pub channel_id: Uint256,
 191         /// The position of the funding transaction in the chain. None if the funding transaction has
 192         /// not yet been confirmed and the channel fully opened.
 193         pub short_channel_id: Option<u64>,
 194         pub remote_network_id: PublicKey,
 195         pub channel_value_satoshis: u64,
 196         /// The user_id passed in to create_channel, or 0 if the channel was inbound.
 197         pub user_id: u64,
 198 }
 199
 200 impl ChannelManager {
 201         /// Constructs a new ChannelManager to hold several channels and route between them. This is
 202         /// the main "logic hub" for all channel-related actions, and implements ChannelMessageHandler.
 203         /// fee_proportional_millionths is an optional fee to charge any payments routed through us.
 204         /// Non-proportional fees are fixed according to our risk using the provided fee estimator.
 205         /// panics if channel_value_satoshis is >= (1 << 24)!
 206         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> {
 207                 let secp_ctx = Secp256k1::new();
 208
 209                 let res = Arc::new(ChannelManager {
 210                         genesis_hash: genesis_block(network).header.bitcoin_hash(),
 211                         fee_estimator: feeest.clone(),
 212                         monitor: monitor.clone(),
 213                         chain_monitor,
 214                         tx_broadcaster,
 215
 216                         announce_channels_publicly,
 217                         fee_proportional_millionths,
 218                         secp_ctx,
 219
 220                         channel_state: Mutex::new(ChannelHolder{
 221                                 by_id: HashMap::new(),
 222                                 short_to_id: HashMap::new(),
 223                                 next_forward: Instant::now(),
 224                                 forward_htlcs: HashMap::new(),
 225                                 claimable_htlcs: HashMap::new(),
 226                         }),
 227                         our_network_key,
 228
 229                         pending_events: Mutex::new(Vec::new()),
 230                 });
 231                 let weak_res = Arc::downgrade(&res);
 232                 res.chain_monitor.register_listener(weak_res);
 233                 Ok(res)
 234         }
 235
 236         pub fn create_channel(&self, their_network_key: PublicKey, channel_value_satoshis: u64, user_id: u64) -> Result<msgs::OpenChannel, HandleError> {
 237                 let chan_keys = if cfg!(feature = "fuzztarget") {
 238                         ChannelKeys {
 239                                 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(),
 240                                 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(),
 241                                 payment_base_key:          SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
 242                                 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(),
 243                                 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(),
 244                                 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(),
 245                                 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(),
 246                                 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],
 247                         }
 248                 } else {
 249                         let mut key_seed = [0u8; 32];
 250                         rng::fill_bytes(&mut key_seed);
 251                         match ChannelKeys::new_from_seed(&key_seed) {
 252                                 Ok(key) => key,
 253                                 Err(_) => panic!("RNG is busted!")
 254                         }
 255                 };
 256
 257                 let channel = Channel::new_outbound(&*self.fee_estimator, chan_keys, their_network_key, channel_value_satoshis, self.announce_channels_publicly, user_id);
 258                 let res = channel.get_open_channel(self.genesis_hash.clone(), &*self.fee_estimator)?;
 259                 let mut channel_state = self.channel_state.lock().unwrap();
 260                 match channel_state.by_id.insert(channel.channel_id(), channel) {
 261                         Some(_) => panic!("RNG is bad???"),
 262                         None => Ok(res)
 263                 }
 264         }
 265
 266         /// Gets the list of open channels, in random order. See ChannelDetail field documentation for
 267         /// more information.
 268         pub fn list_channels(&self) -> Vec<ChannelDetails> {
 269                 let channel_state = self.channel_state.lock().unwrap();
 270                 let mut res = Vec::with_capacity(channel_state.by_id.len());
 271                 for (channel_id, channel) in channel_state.by_id.iter() {
 272                         res.push(ChannelDetails {
 273                                 channel_id: (*channel_id).clone(),
 274                                 short_channel_id: channel.get_short_channel_id(),
 275                                 remote_network_id: channel.get_their_node_id(),
 276                                 channel_value_satoshis: channel.get_value_satoshis(),
 277                                 user_id: channel.get_user_id(),
 278                         });
 279                 }
 280                 res
 281         }
 282
 283         /// Begins the process of closing a channel. After this call (plus some timeout), no new HTLCs
 284         /// will be accepted on the given channel, and after additional timeout/the closing of all
 285         /// pending HTLCs, the channel will be closed on chain.
 286         pub fn close_channel(&self, channel_id: &Uint256) -> Result<msgs::Shutdown, HandleError> {
 287                 let (res, chan_option) = {
 288                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 289                         let channel_state = channel_state_lock.borrow_parts();
 290                         match channel_state.by_id.entry(channel_id.clone()) {
 291                                 hash_map::Entry::Occupied(mut chan_entry) => {
 292                                         let res = chan_entry.get_mut().get_shutdown()?;
 293                                         if chan_entry.get().is_shutdown() {
 294                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
 295                                                         channel_state.short_to_id.remove(&short_id);
 296                                                 }
 297                                                 (res, Some(chan_entry.remove_entry().1))
 298                                         } else { (res, None) }
 299                                 },
 300                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "No such channel", msg: None})
 301                         }
 302                 };
 303                 for payment_hash in res.1 {
 304                         // unknown_next_peer...I dunno who that is anymore....
 305                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
 306                 }
 307                 if let Some(chan) = chan_option {
 308                         if let Ok(update) = self.get_channel_update(&chan) {
 309                                 let mut events = self.pending_events.lock().unwrap();
 310                                 events.push(events::Event::BroadcastChannelUpdate {
 311                                         msg: update
 312                                 });
 313                         }
 314                 }
 315                 Ok(res.0)
 316         }
 317
 318         #[inline]
 319         fn gen_rho_mu_from_shared_secret(shared_secret: &SharedSecret) -> ([u8; 32], [u8; 32]) {
 320                 ({
 321                         let mut hmac = Hmac::new(Sha256::new(), &[0x72, 0x68, 0x6f]); // rho
 322                         hmac.input(&shared_secret[..]);
 323                         let mut res = [0; 32];
 324                         hmac.raw_result(&mut res);
 325                         res
 326                 },
 327                 {
 328                         let mut hmac = Hmac::new(Sha256::new(), &[0x6d, 0x75]); // mu
 329                         hmac.input(&shared_secret[..]);
 330                         let mut res = [0; 32];
 331                         hmac.raw_result(&mut res);
 332                         res
 333                 })
 334         }
 335
 336         #[inline]
 337         fn gen_um_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 338                 let mut hmac = Hmac::new(Sha256::new(), &[0x75, 0x6d]); // um
 339                 hmac.input(&shared_secret[..]);
 340                 let mut res = [0; 32];
 341                 hmac.raw_result(&mut res);
 342                 res
 343         }
 344
 345         #[inline]
 346         fn gen_ammag_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 347                 let mut hmac = Hmac::new(Sha256::new(), &[0x61, 0x6d, 0x6d, 0x61, 0x67]); // ammag
 348                 hmac.input(&shared_secret[..]);
 349                 let mut res = [0; 32];
 350                 hmac.raw_result(&mut res);
 351                 res
 352         }
 353
 354         // can only fail if an intermediary hop has an invalid public key or session_priv is invalid
 355         #[inline]
 356         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> {
 357                 let mut blinded_priv = session_priv.clone();
 358                 let mut blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 359                 let mut first_iteration = true;
 360
 361                 for hop in route.hops.iter() {
 362                         let shared_secret = SharedSecret::new(secp_ctx, &hop.pubkey, &blinded_priv);
 363
 364                         let mut sha = Sha256::new();
 365                         sha.input(&blinded_pub.serialize()[..]);
 366                         sha.input(&shared_secret[..]);
 367                         let mut blinding_factor = [0u8; 32];
 368                         sha.result(&mut blinding_factor);
 369
 370                         if first_iteration {
 371                                 blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 372                                 first_iteration = false;
 373                         }
 374                         let ephemeral_pubkey = blinded_pub;
 375
 376                         secp_call!(blinded_priv.mul_assign(secp_ctx, &secp_call!(SecretKey::from_slice(secp_ctx, &blinding_factor))));
 377                         blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 378
 379                         callback(shared_secret, blinding_factor, ephemeral_pubkey, hop);
 380                 }
 381
 382                 Ok(())
 383         }
 384
 385         // can only fail if an intermediary hop has an invalid public key or session_priv is invalid
 386         fn construct_onion_keys(secp_ctx: &Secp256k1, route: &Route, session_priv: &SecretKey) -> Result<Vec<OnionKeys>, HandleError> {
 387                 let mut res = Vec::with_capacity(route.hops.len());
 388
 389                 Self::construct_onion_keys_callback(secp_ctx, route, session_priv, |shared_secret, _blinding_factor, ephemeral_pubkey, _| {
 390                         let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
 391
 392                         res.push(OnionKeys {
 393                                 #[cfg(test)]
 394                                 shared_secret,
 395                                 #[cfg(test)]
 396                                 blinding_factor: _blinding_factor,
 397                                 ephemeral_pubkey,
 398                                 rho,
 399                                 mu,
 400                         });
 401                 })?;
 402
 403                 Ok(res)
 404         }
 405
 406         /// returns the hop data, as well as the first-hop value_msat and CLTV value we should send.
 407         fn build_onion_payloads(route: &Route) -> Result<(Vec<msgs::OnionHopData>, u64, u32), HandleError> {
 408                 let mut cur_value_msat = 0u64;
 409                 let mut cur_cltv = 0u32;
 410                 let mut last_short_channel_id = 0;
 411                 let mut res: Vec<msgs::OnionHopData> = Vec::with_capacity(route.hops.len());
 412                 internal_traits::test_no_dealloc::<msgs::OnionHopData>(None);
 413                 unsafe { res.set_len(route.hops.len()); }
 414
 415                 for (idx, hop) in route.hops.iter().enumerate().rev() {
 416                         // First hop gets special values so that it can check, on receipt, that everything is
 417                         // exactly as it should be (and the next hop isn't trying to probe to find out if we're
 418                         // the intended recipient).
 419                         let value_msat = if cur_value_msat == 0 { hop.fee_msat } else { cur_value_msat };
 420                         let cltv = if cur_cltv == 0 { hop.cltv_expiry_delta } else { cur_cltv };
 421                         res[idx] = msgs::OnionHopData {
 422                                 realm: 0,
 423                                 data: msgs::OnionRealm0HopData {
 424                                         short_channel_id: last_short_channel_id,
 425                                         amt_to_forward: value_msat,
 426                                         outgoing_cltv_value: cltv,
 427                                 },
 428                                 hmac: [0; 32],
 429                         };
 430                         cur_value_msat += hop.fee_msat;
 431                         if cur_value_msat >= 21000000 * 100000000 * 1000 {
 432                                 return Err(HandleError{err: "Channel fees overflowed?!", msg: None});
 433                         }
 434                         cur_cltv += hop.cltv_expiry_delta as u32;
 435                         if cur_cltv >= 500000000 {
 436                                 return Err(HandleError{err: "Channel CLTV overflowed?!", msg: None});
 437                         }
 438                         last_short_channel_id = hop.short_channel_id;
 439                 }
 440                 Ok((res, cur_value_msat, cur_cltv))
 441         }
 442
 443         #[inline]
 444         fn shift_arr_right(arr: &mut [u8; 20*65]) {
 445                 unsafe {
 446                         ptr::copy(arr[0..].as_ptr(), arr[65..].as_mut_ptr(), 19*65);
 447                 }
 448                 for i in 0..65 {
 449                         arr[i] = 0;
 450                 }
 451         }
 452
 453         #[inline]
 454         fn xor_bufs(dst: &mut[u8], src: &[u8]) {
 455                 assert_eq!(dst.len(), src.len());
 456
 457                 for i in 0..dst.len() {
 458                         dst[i] ^= src[i];
 459                 }
 460         }
 461
 462         const ZERO:[u8; 21*65] = [0; 21*65];
 463         fn construct_onion_packet(mut payloads: Vec<msgs::OnionHopData>, onion_keys: Vec<OnionKeys>, associated_data: Vec<u8>) -> Result<msgs::OnionPacket, HandleError> {
 464                 let mut buf = Vec::with_capacity(21*65);
 465                 buf.resize(21*65, 0);
 466
 467                 let filler = {
 468                         let iters = payloads.len() - 1;
 469                         let end_len = iters * 65;
 470                         let mut res = Vec::with_capacity(end_len);
 471                         res.resize(end_len, 0);
 472
 473                         for (i, keys) in onion_keys.iter().enumerate() {
 474                                 if i == payloads.len() - 1 { continue; }
 475                                 let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 476                                 chacha.process(&ChannelManager::ZERO, &mut buf); // We don't have a seek function :(
 477                                 ChannelManager::xor_bufs(&mut res[0..(i + 1)*65], &buf[(20 - i)*65..21*65]);
 478                         }
 479                         res
 480                 };
 481
 482                 let mut packet_data = [0; 20*65];
 483                 let mut hmac_res = [0; 32];
 484
 485                 for (i, (payload, keys)) in payloads.iter_mut().zip(onion_keys.iter()).rev().enumerate() {
 486                         ChannelManager::shift_arr_right(&mut packet_data);
 487                         payload.hmac = hmac_res;
 488                         packet_data[0..65].copy_from_slice(&payload.encode()[..]);
 489
 490                         let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 491                         chacha.process(&packet_data, &mut buf[0..20*65]);
 492                         packet_data[..].copy_from_slice(&buf[0..20*65]);
 493
 494                         if i == 0 {
 495                                 packet_data[20*65 - filler.len()..20*65].copy_from_slice(&filler[..]);
 496                         }
 497
 498                         let mut hmac = Hmac::new(Sha256::new(), &keys.mu);
 499                         hmac.input(&packet_data);
 500                         hmac.input(&associated_data[..]);
 501                         hmac.raw_result(&mut hmac_res);
 502                 }
 503
 504                 Ok(msgs::OnionPacket{
 505                         version: 0,
 506                         public_key: onion_keys.first().unwrap().ephemeral_pubkey,
 507                         hop_data: packet_data,
 508                         hmac: hmac_res,
 509                 })
 510         }
 511
 512         /// Encrypts a failure packet. raw_packet can either be a
 513         /// msgs::DecodedOnionErrorPacket.encode() result or a msgs::OnionErrorPacket.data element.
 514         fn encrypt_failure_packet(shared_secret: &SharedSecret, raw_packet: &[u8]) -> msgs::OnionErrorPacket {
 515                 let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
 516
 517                 let mut packet_crypted = Vec::with_capacity(raw_packet.len());
 518                 packet_crypted.resize(raw_packet.len(), 0);
 519                 let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
 520                 chacha.process(&raw_packet, &mut packet_crypted[..]);
 521                 msgs::OnionErrorPacket {
 522                         data: packet_crypted,
 523                 }
 524         }
 525
 526         fn build_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::DecodedOnionErrorPacket {
 527                 assert!(failure_data.len() <= 256 - 2);
 528
 529                 let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
 530
 531                 let failuremsg = {
 532                         let mut res = Vec::with_capacity(2 + failure_data.len());
 533                         res.push(((failure_type >> 8) & 0xff) as u8);
 534                         res.push(((failure_type >> 0) & 0xff) as u8);
 535                         res.extend_from_slice(&failure_data[..]);
 536                         res
 537                 };
 538                 let pad = {
 539                         let mut res = Vec::with_capacity(256 - 2 - failure_data.len());
 540                         res.resize(256 - 2 - failure_data.len(), 0);
 541                         res
 542                 };
 543                 let mut packet = msgs::DecodedOnionErrorPacket {
 544                         hmac: [0; 32],
 545                         failuremsg: failuremsg,
 546                         pad: pad,
 547                 };
 548
 549                 let mut hmac = Hmac::new(Sha256::new(), &um);
 550                 hmac.input(&packet.encode()[32..]);
 551                 hmac.raw_result(&mut packet.hmac);
 552
 553                 packet
 554         }
 555
 556         #[inline]
 557         fn build_first_hop_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::OnionErrorPacket {
 558                 let failure_packet = ChannelManager::build_failure_packet(shared_secret, failure_type, failure_data);
 559                 ChannelManager::encrypt_failure_packet(shared_secret, &failure_packet.encode()[..])
 560         }
 561
 562         /// only fails if the channel does not yet have an assigned short_id
 563         fn get_channel_update(&self, chan: &Channel) -> Result<msgs::ChannelUpdate, HandleError> {
 564                 let short_channel_id = match chan.get_short_channel_id() {
 565                         None => return Err(HandleError{err: "Channel not yet established", msg: None}),
 566                         Some(id) => id,
 567                 };
 568
 569                 let were_node_one = PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).unwrap().serialize()[..] < chan.get_their_node_id().serialize()[..];
 570
 571                 let unsigned = msgs::UnsignedChannelUpdate {
 572                         chain_hash: self.genesis_hash,
 573                         short_channel_id: short_channel_id,
 574                         timestamp: chan.get_channel_update_count(),
 575                         flags: (!were_node_one) as u16 | ((!chan.is_live() as u16) << 1),
 576                         cltv_expiry_delta: CLTV_EXPIRY_DELTA,
 577                         htlc_minimum_msat: chan.get_our_htlc_minimum_msat(),
 578                         fee_base_msat: chan.get_our_fee_base_msat(&*self.fee_estimator),
 579                         fee_proportional_millionths: self.fee_proportional_millionths,
 580                 };
 581
 582                 let msg_hash = Sha256dHash::from_data(&unsigned.encode()[..]);
 583                 let sig = self.secp_ctx.sign(&Message::from_slice(&msg_hash[..]).unwrap(), &self.our_network_key).unwrap(); //TODO Can we unwrap here?
 584
 585                 Ok(msgs::ChannelUpdate {
 586                         signature: sig,
 587                         contents: unsigned
 588                 })
 589         }
 590
 591         /// Sends a payment along a given route.
 592         /// Value parameters are provided via the last hop in route, see documentation for RouteHop
 593         /// fields for more info.
 594         /// See-also docs on Channel::send_htlc_and_commit.
 595         /// May generate a SendHTLCs event on success, which should be relayed.
 596         pub fn send_payment(&self, route: Route, payment_hash: [u8; 32]) -> Result<(), HandleError> {
 597                 if route.hops.len() < 1 || route.hops.len() > 20 {
 598                         return Err(HandleError{err: "Route didn't go anywhere/had bogus size", msg: None});
 599                 }
 600                 let our_node_id = self.get_our_node_id();
 601                 for (idx, hop) in route.hops.iter().enumerate() {
 602                         if idx != route.hops.len() - 1 && hop.pubkey == our_node_id {
 603                                 return Err(HandleError{err: "Route went through us but wasn't a simple rebalance loop to us", msg: None});
 604                         }
 605                 }
 606
 607                 let session_priv = secp_call!(SecretKey::from_slice(&self.secp_ctx, &{
 608                         let mut session_key = [0; 32];
 609                         rng::fill_bytes(&mut session_key);
 610                         session_key
 611                 }));
 612
 613                 let associated_data = Vec::new(); //TODO: What to put here?
 614
 615                 let onion_keys = ChannelManager::construct_onion_keys(&self.secp_ctx, &route, &session_priv)?;
 616                 let (onion_payloads, htlc_msat, htlc_cltv) = ChannelManager::build_onion_payloads(&route)?;
 617                 let onion_packet = ChannelManager::construct_onion_packet(onion_payloads, onion_keys, associated_data)?;
 618
 619                 let (first_hop_node_id, (update_add, commitment_signed, chan_monitor)) = {
 620                         let mut channel_state = self.channel_state.lock().unwrap();
 621                         let id = match channel_state.short_to_id.get(&route.hops.first().unwrap().short_channel_id) {
 622                                 None => return Err(HandleError{err: "No channel available with first hop!", msg: None}),
 623                                 Some(id) => id.clone()
 624                         };
 625                         let res = {
 626                                 let chan = channel_state.by_id.get_mut(&id).unwrap();
 627                                 if chan.get_their_node_id() != route.hops.first().unwrap().pubkey {
 628                                         return Err(HandleError{err: "Node ID mismatch on first hop!", msg: None});
 629                                 }
 630                                 chan.send_htlc_and_commit(htlc_msat, payment_hash.clone(), htlc_cltv, onion_packet)?
 631                         };
 632
 633                         let first_hop_node_id = route.hops.first().unwrap().pubkey;
 634
 635                         if channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::OutboundRoute {
 636                                 route,
 637                                 session_priv,
 638                         }).is_some() {
 639                                 // TODO: We need to track these better, we're not generating these, so a
 640                                 // third-party might make this happen:
 641                                 panic!("payment_hash was repeated! Don't let this happen");
 642                         }
 643
 644                         match res {
 645                                 Some(msgs) => (first_hop_node_id, msgs),
 646                                 None => return Ok(()),
 647                         }
 648                 };
 649
 650                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 651                         unimplemented!(); // maybe remove from claimable_htlcs?
 652                 }
 653
 654                 let mut events = self.pending_events.lock().unwrap();
 655                 events.push(events::Event::SendHTLCs {
 656                         node_id: first_hop_node_id,
 657                         msgs: vec![update_add],
 658                         commitment_msg: commitment_signed,
 659                 });
 660                 Ok(())
 661         }
 662
 663         /// Call this upon creation of a funding transaction for the given channel.
 664         /// Panics if a funding transaction has already been provided for this channel.
 665         pub fn funding_transaction_generated(&self, temporary_channel_id: &Uint256, funding_txo: OutPoint) {
 666                 let (chan, msg, chan_monitor) = {
 667                         let mut channel_state = self.channel_state.lock().unwrap();
 668                         match channel_state.by_id.remove(&temporary_channel_id) {
 669                                 Some(mut chan) => {
 670                                         match chan.get_outbound_funding_created(funding_txo) {
 671                                                 Ok(funding_msg) => {
 672                                                         (chan, funding_msg.0, funding_msg.1)
 673                                                 },
 674                                                 Err(_e) => {
 675                                                         //TODO: Push e to pendingevents
 676                                                         return;
 677                                                 }
 678                                         }
 679                                 },
 680                                 None => return
 681                         }
 682                 }; // Release channel lock for install_watch_outpoint call,
 683                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 684                         unimplemented!(); // maybe remove from claimable_htlcs?
 685                 }
 686                 {
 687                         let mut pending_events = self.pending_events.lock().unwrap();
 688                         pending_events.push(events::Event::SendFundingCreated {
 689                                 node_id: chan.get_their_node_id(),
 690                                 msg: msg,
 691                         });
 692                 }
 693
 694                 let mut channel_state = self.channel_state.lock().unwrap();
 695                 channel_state.by_id.insert(chan.channel_id(), chan);
 696         }
 697
 698         fn get_announcement_sigs(&self, chan: &Channel) -> Result<Option<msgs::AnnouncementSignatures>, HandleError> {
 699                 if !chan.is_usable() { return Ok(None) }
 700
 701                 let (announcement, our_bitcoin_sig) = chan.get_channel_announcement(self.get_our_node_id(), self.genesis_hash.clone())?;
 702                 let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
 703                 let our_node_sig = secp_call!(self.secp_ctx.sign(&msghash, &self.our_network_key));
 704
 705                 Ok(Some(msgs::AnnouncementSignatures {
 706                         channel_id: chan.channel_id(),
 707                         short_channel_id: chan.get_short_channel_id().unwrap(),
 708                         node_signature: our_node_sig,
 709                         bitcoin_signature: our_bitcoin_sig,
 710                 }))
 711         }
 712
 713         pub fn process_pending_htlc_forward(&self) {
 714                 let mut new_events = Vec::new();
 715                 let mut failed_forwards = Vec::new();
 716                 {
 717                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 718                         let channel_state = channel_state_lock.borrow_parts();
 719
 720                         if cfg!(not(feature = "fuzztarget")) && Instant::now() < *channel_state.next_forward {
 721                                 return;
 722                         }
 723
 724                         for (short_chan_id, pending_forwards) in channel_state.forward_htlcs.drain() {
 725                                 if short_chan_id != 0 {
 726                                         let forward_chan_id = match channel_state.short_to_id.get(&short_chan_id) {
 727                                                 Some(chan_id) => chan_id.clone(),
 728                                                 None => {
 729                                                         failed_forwards.reserve(pending_forwards.len());
 730                                                         for forward_info in pending_forwards {
 731                                                                 failed_forwards.push((forward_info.payment_hash, 0x4000 | 10, None));
 732                                                         }
 733                                                         // TODO: Send a failure packet back on each pending_forward
 734                                                         continue;
 735                                                 }
 736                                         };
 737                                         let forward_chan = &mut channel_state.by_id.get_mut(&forward_chan_id).unwrap();
 738
 739                                         let mut add_htlc_msgs = Vec::new();
 740                                         for forward_info in pending_forwards {
 741                                                 match forward_chan.send_htlc(forward_info.amt_to_forward, forward_info.payment_hash, forward_info.outgoing_cltv_value, forward_info.onion_packet.unwrap()) {
 742                                                         Err(_e) => {
 743                                                                 let chan_update = self.get_channel_update(forward_chan).unwrap();
 744                                                                 failed_forwards.push((forward_info.payment_hash, 0x4000 | 7, Some(chan_update)));
 745                                                                 continue;
 746                                                         },
 747                                                         Ok(update_add) => {
 748                                                                 match update_add {
 749                                                                         Some(msg) => { add_htlc_msgs.push(msg); },
 750                                                                         None => {
 751                                                                                 // Nothing to do here...we're waiting on a remote
 752                                                                                 // revoke_and_ack before we can add anymore HTLCs. The Channel
 753                                                                                 // will automatically handle building the update_add_htlc and
 754                                                                                 // commitment_signed messages when we can.
 755                                                                                 // TODO: Do some kind of timer to set the channel as !is_live()
 756                                                                                 // as we don't really want others relying on us relaying through
 757                                                                                 // this channel currently :/.
 758                                                                         }
 759                                                                 }
 760                                                         }
 761                                                 }
 762                                         }
 763
 764                                         if !add_htlc_msgs.is_empty() {
 765                                                 let (commitment_msg, monitor) = match forward_chan.send_commitment() {
 766                                                         Ok(res) => res,
 767                                                         Err(_) => {
 768                                                                 //TODO: Handle...this is bad!
 769                                                                 continue;
 770                                                         },
 771                                                 };
 772                                                 new_events.push((Some(monitor), events::Event::SendHTLCs {
 773                                                         node_id: forward_chan.get_their_node_id(),
 774                                                         msgs: add_htlc_msgs,
 775                                                         commitment_msg: commitment_msg,
 776                                                 }));
 777                                         }
 778                                 } else {
 779                                         for forward_info in pending_forwards {
 780                                                 new_events.push((None, events::Event::PaymentReceived {
 781                                                         payment_hash: forward_info.payment_hash,
 782                                                         amt: forward_info.amt_to_forward,
 783                                                 }));
 784                                         }
 785                                 }
 786                         }
 787                 }
 788
 789                 for failed_forward in failed_forwards.drain(..) {
 790                         match failed_forward.2 {
 791                                 None => self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &failed_forward.0, HTLCFailReason::Reason { failure_code: failed_forward.1, data: Vec::new() }),
 792                                 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() }),
 793                         };
 794                 }
 795
 796                 if new_events.is_empty() { return }
 797
 798                 new_events.retain(|event| {
 799                         if let &Some(ref monitor) = &event.0 {
 800                                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor.clone()) {
 801                                         unimplemented!();// but def dont push the event...
 802                                 }
 803                         }
 804                         true
 805                 });
 806
 807                 let mut events = self.pending_events.lock().unwrap();
 808                 events.reserve(new_events.len());
 809                 for event in new_events.drain(..) {
 810                         events.push(event.1);
 811                 }
 812         }
 813
 814         /// Indicates that the preimage for payment_hash is unknown after a PaymentReceived event.
 815         pub fn fail_htlc_backwards(&self, payment_hash: &[u8; 32]) -> bool {
 816                 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 15, data: Vec::new() })
 817         }
 818
 819         fn fail_htlc_backwards_internal(&self, mut channel_state: MutexGuard<ChannelHolder>, payment_hash: &[u8; 32], onion_error: HTLCFailReason) -> bool {
 820                 let mut pending_htlc = {
 821                         match channel_state.claimable_htlcs.remove(payment_hash) {
 822                                 Some(pending_htlc) => pending_htlc,
 823                                 None => return false,
 824                         }
 825                 };
 826
 827                 match pending_htlc {
 828                         PendingOutboundHTLC::CycledRoute { source_short_channel_id, incoming_packet_shared_secret, route, session_priv } => {
 829                                 channel_state.claimable_htlcs.insert(payment_hash.clone(), PendingOutboundHTLC::OutboundRoute {
 830                                         route,
 831                                         session_priv,
 832                                 });
 833                                 pending_htlc = PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret };
 834                         },
 835                         _ => {}
 836                 }
 837
 838                 match pending_htlc {
 839                         PendingOutboundHTLC::CycledRoute { .. } => { panic!("WAT"); },
 840                         PendingOutboundHTLC::OutboundRoute { .. } => {
 841                                 mem::drop(channel_state);
 842
 843                                 let mut pending_events = self.pending_events.lock().unwrap();
 844                                 pending_events.push(events::Event::PaymentFailed {
 845                                         payment_hash: payment_hash.clone()
 846                                 });
 847                                 false
 848                         },
 849                         PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret } => {
 850                                 let err_packet = match onion_error {
 851                                         HTLCFailReason::Reason { failure_code, data } => {
 852                                                 let packet = ChannelManager::build_failure_packet(&incoming_packet_shared_secret, failure_code, &data[..]).encode();
 853                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &packet)
 854                                         },
 855                                         HTLCFailReason::ErrorPacket { err } => {
 856                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &err.data)
 857                                         }
 858                                 };
 859
 860                                 let (node_id, fail_msgs) = {
 861                                         let chan_id = match channel_state.short_to_id.get(&source_short_channel_id) {
 862                                                 Some(chan_id) => chan_id.clone(),
 863                                                 None => return false
 864                                         };
 865
 866                                         let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
 867                                         match chan.get_update_fail_htlc_and_commit(payment_hash, err_packet) {
 868                                                 Ok(msg) => (chan.get_their_node_id(), msg),
 869                                                 Err(_e) => {
 870                                                         //TODO: Do something with e?
 871                                                         return false;
 872                                                 },
 873                                         }
 874                                 };
 875
 876                                 match fail_msgs {
 877                                         Some((msg, commitment_msg, chan_monitor)) => {
 878                                                 mem::drop(channel_state);
 879
 880                                                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 881                                                         unimplemented!();// but def dont push the event...
 882                                                 }
 883
 884                                                 let mut pending_events = self.pending_events.lock().unwrap();
 885                                                 pending_events.push(events::Event::SendFailHTLC {
 886                                                         node_id,
 887                                                         msg: msg,
 888                                                         commitment_msg: commitment_msg,
 889                                                 });
 890                                         },
 891                                         None => {},
 892                                 }
 893
 894                                 true
 895                         },
 896                 }
 897         }
 898
 899         /// Provides a payment preimage in response to a PaymentReceived event, returning true and
 900         /// generating message events for the net layer to claim the payment, if possible. Thus, you
 901         /// should probably kick the net layer to go send messages if this returns true!
 902         /// May panic if called except in response to a PaymentReceived event.
 903         pub fn claim_funds(&self, payment_preimage: [u8; 32]) -> bool {
 904                 self.claim_funds_internal(payment_preimage, true)
 905         }
 906         pub fn claim_funds_internal(&self, payment_preimage: [u8; 32], from_user: bool) -> bool {
 907                 let mut sha = Sha256::new();
 908                 sha.input(&payment_preimage);
 909                 let mut payment_hash = [0; 32];
 910                 sha.result(&mut payment_hash);
 911
 912                 let mut channel_state = self.channel_state.lock().unwrap();
 913                 let mut pending_htlc = {
 914                         match channel_state.claimable_htlcs.remove(&payment_hash) {
 915                                 Some(pending_htlc) => pending_htlc,
 916                                 None => return false,
 917                         }
 918                 };
 919
 920                 match pending_htlc {
 921                         PendingOutboundHTLC::CycledRoute { source_short_channel_id, incoming_packet_shared_secret, route, session_priv } => {
 922                                 if from_user { // This was the end hop back to us
 923                                         pending_htlc = PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret };
 924                                         channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::OutboundRoute { route, session_priv });
 925                                 } else { // This came from the first upstream node
 926                                         // Bank error in our favor! Maybe we should tell the user this somehow???
 927                                         pending_htlc = PendingOutboundHTLC::OutboundRoute { route, session_priv };
 928                                         channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret });
 929                                 }
 930                         },
 931                         _ => {},
 932                 }
 933
 934                 match pending_htlc {
 935                         PendingOutboundHTLC::CycledRoute { .. } => { panic!("WAT"); },
 936                         PendingOutboundHTLC::OutboundRoute { .. } => {
 937                                 if from_user {
 938                                         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...");
 939                                 }
 940                                 mem::drop(channel_state);
 941                                 let mut pending_events = self.pending_events.lock().unwrap();
 942                                 pending_events.push(events::Event::PaymentSent {
 943                                         payment_preimage
 944                                 });
 945                                 false
 946                         },
 947                         PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, .. } => {
 948                                 let (node_id, fulfill_msgs) = {
 949                                         let chan_id = match channel_state.short_to_id.get(&source_short_channel_id) {
 950                                                 Some(chan_id) => chan_id.clone(),
 951                                                 None => return false
 952                                         };
 953
 954                                         let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
 955                                         match chan.get_update_fulfill_htlc_and_commit(payment_preimage) {
 956                                                 Ok(msg) => (chan.get_their_node_id(), msg),
 957                                                 Err(_e) => {
 958                                                         //TODO: Do something with e?
 959                                                         return false;
 960                                                 },
 961                                         }
 962                                 };
 963
 964                                 mem::drop(channel_state);
 965                                 match fulfill_msgs {
 966                                         Some((msg, commitment_msg, chan_monitor)) => {
 967                                                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 968                                                         unimplemented!();// but def dont push the event...
 969                                                 }
 970
 971                                                 let mut pending_events = self.pending_events.lock().unwrap();
 972                                                 pending_events.push(events::Event::SendFulfillHTLC {
 973                                                         node_id: node_id,
 974                                                         msg,
 975                                                         commitment_msg,
 976                                                 });
 977                                         },
 978                                         None => {},
 979                                 }
 980                                 true
 981                         },
 982                 }
 983         }
 984
 985         /// Gets the node_id held by this ChannelManager
 986         pub fn get_our_node_id(&self) -> PublicKey {
 987                 PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).unwrap()
 988         }
 989
 990         /// Used to restore channels to normal operation after a
 991         /// ChannelMonitorUpdateErr::TemporaryFailure was returned from a channel monitor update
 992         /// operation.
 993         pub fn test_restore_channel_monitor(&self) {
 994                 unimplemented!();
 995         }
 996 }
 997
 998 impl events::EventsProvider for ChannelManager {
 999         fn get_and_clear_pending_events(&self) -> Vec<events::Event> {
1000                 let mut pending_events = self.pending_events.lock().unwrap();
1001                 let mut ret = Vec::new();
1002                 mem::swap(&mut ret, &mut *pending_events);
1003                 ret
1004         }
1005 }
1006
1007 impl ChainListener for ChannelManager {
1008         fn block_connected(&self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) {
1009                 let mut new_events = Vec::new();
1010                 {
1011                         let mut channel_state = self.channel_state.lock().unwrap();
1012                         let mut short_to_ids_to_insert = Vec::new();
1013                         let mut short_to_ids_to_remove = Vec::new();
1014                         channel_state.by_id.retain(|_, channel| {
1015                                 if let Some(funding_locked) = channel.block_connected(header, height, txn_matched, indexes_of_txn_matched) {
1016                                         let announcement_sigs = match self.get_announcement_sigs(channel) {
1017                                                 Ok(res) => res,
1018                                                 Err(_e) => {
1019                                                         //TODO: push e on events and blow up the channel (it has bad keys)
1020                                                         return true;
1021                                                 }
1022                                         };
1023                                         new_events.push(events::Event::SendFundingLocked {
1024                                                 node_id: channel.get_their_node_id(),
1025                                                 msg: funding_locked,
1026                                                 announcement_sigs: announcement_sigs
1027                                         });
1028                                         short_to_ids_to_insert.push((channel.get_short_channel_id().unwrap(), channel.channel_id()));
1029                                 }
1030                                 if let Some(funding_txo) = channel.get_funding_txo() {
1031                                         for tx in txn_matched {
1032                                                 for inp in tx.input.iter() {
1033                                                         if inp.prev_hash == funding_txo.txid && inp.prev_index == funding_txo.index as u32 {
1034                                                                 if let Some(short_id) = channel.get_short_channel_id() {
1035                                                                         short_to_ids_to_remove.push(short_id);
1036                                                                 }
1037                                                                 channel.force_shutdown();
1038                                                                 if let Ok(update) = self.get_channel_update(&channel) {
1039                                                                         new_events.push(events::Event::BroadcastChannelUpdate {
1040                                                                                 msg: update
1041                                                                         });
1042                                                                 }
1043                                                                 return false;
1044                                                         }
1045                                                 }
1046                                         }
1047                                 }
1048                                 if channel.channel_monitor().would_broadcast_at_height(height) {
1049                                         if let Some(short_id) = channel.get_short_channel_id() {
1050                                                 short_to_ids_to_remove.push(short_id);
1051                                         }
1052                                         channel.force_shutdown();
1053                                         if let Ok(update) = self.get_channel_update(&channel) {
1054                                                 new_events.push(events::Event::BroadcastChannelUpdate {
1055                                                         msg: update
1056                                                 });
1057                                         }
1058                                         return false;
1059                                 }
1060                                 true
1061                         });
1062                         for to_remove in short_to_ids_to_remove {
1063                                 channel_state.short_to_id.remove(&to_remove);
1064                         }
1065                         for to_insert in short_to_ids_to_insert {
1066                                 channel_state.short_to_id.insert(to_insert.0, to_insert.1);
1067                         }
1068                 }
1069                 let mut pending_events = self.pending_events.lock().unwrap();
1070                 for funding_locked in new_events.drain(..) {
1071                         pending_events.push(funding_locked);
1072                 }
1073         }
1074
1075         fn block_disconnected(&self, header: &BlockHeader) {
1076                 let mut channel_state = self.channel_state.lock().unwrap();
1077                 for channel in channel_state.by_id.values_mut() {
1078                         if channel.block_disconnected(header) {
1079                                 //TODO Close channel here
1080                         }
1081                 }
1082         }
1083 }
1084
1085 impl ChannelMessageHandler for ChannelManager {
1086         //TODO: Handle errors and close channel (or so)
1087         fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &msgs::OpenChannel) -> Result<msgs::AcceptChannel, HandleError> {
1088                 if msg.chain_hash != self.genesis_hash {
1089                         return Err(HandleError{err: "Unknown genesis block hash", msg: None});
1090                 }
1091                 let mut channel_state = self.channel_state.lock().unwrap();
1092                 if channel_state.by_id.contains_key(&msg.temporary_channel_id) {
1093                         return Err(HandleError{err: "temporary_channel_id collision!", msg: None});
1094                 }
1095
1096                 let chan_keys = if cfg!(feature = "fuzztarget") {
1097                         ChannelKeys {
1098                                 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(),
1099                                 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(),
1100                                 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(),
1101                                 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(),
1102                                 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(),
1103                                 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(),
1104                                 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(),
1105                                 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],
1106                         }
1107                 } else {
1108                         let mut key_seed = [0u8; 32];
1109                         rng::fill_bytes(&mut key_seed);
1110                         match ChannelKeys::new_from_seed(&key_seed) {
1111                                 Ok(key) => key,
1112                                 Err(_) => panic!("RNG is busted!")
1113                         }
1114                 };
1115
1116                 let channel = Channel::new_from_req(&*self.fee_estimator, chan_keys, their_node_id.clone(), msg, 0, self.announce_channels_publicly)?;
1117                 let accept_msg = channel.get_accept_channel()?;
1118                 channel_state.by_id.insert(channel.channel_id(), channel);
1119                 Ok(accept_msg)
1120         }
1121
1122         fn handle_accept_channel(&self, their_node_id: &PublicKey, msg: &msgs::AcceptChannel) -> Result<(), HandleError> {
1123                 let (value, output_script, user_id) = {
1124                         let mut channel_state = self.channel_state.lock().unwrap();
1125                         match channel_state.by_id.get_mut(&msg.temporary_channel_id) {
1126                                 Some(chan) => {
1127                                         if chan.get_their_node_id() != *their_node_id {
1128                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1129                                         }
1130                                         chan.accept_channel(&msg)?;
1131                                         (chan.get_value_satoshis(), chan.get_funding_redeemscript().to_v0_p2wsh(), chan.get_user_id())
1132                                 },
1133                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1134                         }
1135                 };
1136                 let mut pending_events = self.pending_events.lock().unwrap();
1137                 pending_events.push(events::Event::FundingGenerationReady {
1138                         temporary_channel_id: msg.temporary_channel_id,
1139                         channel_value_satoshis: value,
1140                         output_script: output_script,
1141                         user_channel_id: user_id,
1142                 });
1143                 Ok(())
1144         }
1145
1146         fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) -> Result<msgs::FundingSigned, HandleError> {
1147                 //TODO: broke this - a node shouldn't be able to get their channel removed by sending a
1148                 //funding_created a second time, or long after the first, or whatever (note this also
1149                 //leaves the short_to_id map in a busted state.
1150                 let (chan, funding_msg, monitor_update) = {
1151                         let mut channel_state = self.channel_state.lock().unwrap();
1152                         match channel_state.by_id.remove(&msg.temporary_channel_id) {
1153                                 Some(mut chan) => {
1154                                         if chan.get_their_node_id() != *their_node_id {
1155                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1156                                         }
1157                                         match chan.funding_created(msg) {
1158                                                 Ok((funding_msg, monitor_update)) => {
1159                                                         (chan, funding_msg, monitor_update)
1160                                                 },
1161                                                 Err(e) => {
1162                                                         return Err(e);
1163                                                 }
1164                                         }
1165                                 },
1166                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1167                         }
1168                 }; // Release channel lock for install_watch_outpoint call,
1169                    // note that this means if the remote end is misbehaving and sends a message for the same
1170                    // channel back-to-back with funding_created, we'll end up thinking they sent a message
1171                    // for a bogus channel.
1172                 if let Err(_e) = self.monitor.add_update_monitor(monitor_update.get_funding_txo().unwrap(), monitor_update) {
1173                         unimplemented!();
1174                 }
1175                 let mut channel_state = self.channel_state.lock().unwrap();
1176                 channel_state.by_id.insert(funding_msg.channel_id, chan);
1177                 Ok(funding_msg)
1178         }
1179
1180         fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) -> Result<(), HandleError> {
1181                 let (funding_txo, user_id, monitor) = {
1182                         let mut channel_state = self.channel_state.lock().unwrap();
1183                         match channel_state.by_id.get_mut(&msg.channel_id) {
1184                                 Some(chan) => {
1185                                         if chan.get_their_node_id() != *their_node_id {
1186                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1187                                         }
1188                                         let chan_monitor = chan.funding_signed(&msg)?;
1189                                         (chan.get_funding_txo().unwrap(), chan.get_user_id(), chan_monitor)
1190                                 },
1191                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1192                         }
1193                 };
1194                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor) {
1195                         unimplemented!();
1196                 }
1197                 let mut pending_events = self.pending_events.lock().unwrap();
1198                 pending_events.push(events::Event::FundingBroadcastSafe {
1199                         funding_txo: funding_txo,
1200                         user_channel_id: user_id,
1201                 });
1202                 Ok(())
1203         }
1204
1205         fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &msgs::FundingLocked) -> Result<Option<msgs::AnnouncementSignatures>, HandleError> {
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!", msg: None})
1211                                 }
1212                                 chan.funding_locked(&msg)?;
1213                                 return Ok(self.get_announcement_sigs(chan)?);
1214                         },
1215                         None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1216                 };
1217         }
1218
1219         fn handle_shutdown(&self, their_node_id: &PublicKey, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>), HandleError> {
1220                 let (res, chan_option) = {
1221                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1222                         let channel_state = channel_state_lock.borrow_parts();
1223
1224                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1225                                 hash_map::Entry::Occupied(mut chan_entry) => {
1226                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1227                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1228                                         }
1229                                         let res = chan_entry.get_mut().shutdown(&*self.fee_estimator, &msg)?;
1230                                         if chan_entry.get().is_shutdown() {
1231                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
1232                                                         channel_state.short_to_id.remove(&short_id);
1233                                                 }
1234                                                 (res, Some(chan_entry.remove_entry().1))
1235                                         } else { (res, None) }
1236                                 },
1237                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1238                         }
1239                 };
1240                 for payment_hash in res.2 {
1241                         // unknown_next_peer...I dunno who that is anymore....
1242                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
1243                 }
1244                 if let Some(chan) = chan_option {
1245                         if let Ok(update) = self.get_channel_update(&chan) {
1246                                 let mut events = self.pending_events.lock().unwrap();
1247                                 events.push(events::Event::BroadcastChannelUpdate {
1248                                         msg: update
1249                                 });
1250                         }
1251                 }
1252                 Ok((res.0, res.1))
1253         }
1254
1255         fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &msgs::ClosingSigned) -> Result<Option<msgs::ClosingSigned>, HandleError> {
1256                 let (res, chan_option) = {
1257                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1258                         let channel_state = channel_state_lock.borrow_parts();
1259                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1260                                 hash_map::Entry::Occupied(mut chan_entry) => {
1261                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1262                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1263                                         }
1264                                         let res = chan_entry.get_mut().closing_signed(&*self.fee_estimator, &msg)?;
1265                                         if res.1.is_some() {
1266                                                 // We're done with this channel, we've got a signed closing transaction and
1267                                                 // will send the closing_signed back to the remote peer upon return. This
1268                                                 // also implies there are no pending HTLCs left on the channel, so we can
1269                                                 // fully delete it from tracking (the channel monitor is still around to
1270                                                 // watch for old state broadcasts)!
1271                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
1272                                                         channel_state.short_to_id.remove(&short_id);
1273                                                 }
1274                                                 (res, Some(chan_entry.remove_entry().1))
1275                                         } else { (res, None) }
1276                                 },
1277                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1278                         }
1279                 };
1280                 if let Some(broadcast_tx) = res.1 {
1281                         self.tx_broadcaster.broadcast_transaction(&broadcast_tx);
1282                 }
1283                 if let Some(chan) = chan_option {
1284                         if let Ok(update) = self.get_channel_update(&chan) {
1285                                 let mut events = self.pending_events.lock().unwrap();
1286                                 events.push(events::Event::BroadcastChannelUpdate {
1287                                         msg: update
1288                                 });
1289                         }
1290                 }
1291                 Ok(res.0)
1292         }
1293
1294         fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) -> Result<(), msgs::HandleError> {
1295                 //TODO: BOLT 4 points out a specific attack where a peer may re-send an onion packet and
1296                 //determine the state of the payment based on our response/if we forward anything/the time
1297                 //we take to respond. We should take care to avoid allowing such an attack.
1298                 //
1299                 //TODO: There exists a further attack where a node may garble the onion data, forward it to
1300                 //us repeatedly garbled in different ways, and compare our error messages, which are
1301                 //encrypted with the same key. Its not immediately obvious how to usefully exploit that,
1302                 //but we should prevent it anyway.
1303
1304                 let shared_secret = SharedSecret::new(&self.secp_ctx, &msg.onion_routing_packet.public_key, &self.our_network_key);
1305                 let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
1306
1307                 let associated_data = Vec::new(); //TODO: What to put here?
1308
1309                 macro_rules! get_onion_hash {
1310                         () => {
1311                                 {
1312                                         let mut sha = Sha256::new();
1313                                         sha.input(&msg.onion_routing_packet.hop_data);
1314                                         let mut onion_hash = [0; 32];
1315                                         sha.result(&mut onion_hash);
1316                                         onion_hash
1317                                 }
1318                         }
1319                 }
1320
1321                 macro_rules! return_err {
1322                         ($msg: expr, $err_code: expr, $data: expr) => {
1323                                 return Err(msgs::HandleError {
1324                                         err: $msg,
1325                                         msg: Some(msgs::ErrorAction::UpdateFailHTLC {
1326                                                 msg: msgs::UpdateFailHTLC {
1327                                                         channel_id: msg.channel_id,
1328                                                         htlc_id: msg.htlc_id,
1329                                                         reason: ChannelManager::build_first_hop_failure_packet(&shared_secret, $err_code, $data),
1330                                                 }
1331                                         }),
1332                                 });
1333                         }
1334                 }
1335
1336                 if msg.onion_routing_packet.version != 0 {
1337                         //TODO: Spec doesn't indicate if we should only hash hop_data here (and in other
1338                         //sha256_of_onion error data packets), or the entire onion_routing_packet. Either way,
1339                         //the hash doesn't really serve any purpuse - in the case of hashing all data, the
1340                         //receiving node would have to brute force to figure out which version was put in the
1341                         //packet by the node that send us the message, in the case of hashing the hop_data, the
1342                         //node knows the HMAC matched, so they already know what is there...
1343                         return_err!("Unknown onion packet version", 0x8000 | 0x4000 | 4, &get_onion_hash!());
1344                 }
1345
1346                 let mut hmac = Hmac::new(Sha256::new(), &mu);
1347                 hmac.input(&msg.onion_routing_packet.hop_data);
1348                 hmac.input(&associated_data[..]);
1349                 if hmac.result() != MacResult::new(&msg.onion_routing_packet.hmac) {
1350                         return_err!("HMAC Check failed", 0x8000 | 0x4000 | 5, &get_onion_hash!());
1351                 }
1352
1353                 let mut chacha = ChaCha20::new(&rho, &[0u8; 8]);
1354                 let next_hop_data = {
1355                         let mut decoded = [0; 65];
1356                         chacha.process(&msg.onion_routing_packet.hop_data[0..65], &mut decoded);
1357                         match msgs::OnionHopData::decode(&decoded[..]) {
1358                                 Err(err) => {
1359                                         let error_code = match err {
1360                                                 msgs::DecodeError::UnknownRealmByte => 0x4000 | 1,
1361                                                 _ => 0x2000 | 2, // Should never happen
1362                                         };
1363                                         return_err!("Unable to decode our hop data", error_code, &[0;0]);
1364                                 },
1365                                 Ok(msg) => msg
1366                         }
1367                 };
1368
1369                 let mut pending_forward_info = if next_hop_data.hmac == [0; 32] {
1370                                 // OUR PAYMENT!
1371                                 if next_hop_data.data.amt_to_forward != msg.amount_msat {
1372                                         return_err!("Upstream node sent less than we were supposed to receive in payment", 19, &byte_utils::be64_to_array(msg.amount_msat));
1373                                 }
1374                                 if next_hop_data.data.outgoing_cltv_value != msg.cltv_expiry {
1375                                         return_err!("Upstream node set CLTV to the wrong value", 18, &byte_utils::be32_to_array(msg.cltv_expiry));
1376                                 }
1377
1378                                 // Note that we could obviously respond immediately with an update_fulfill_htlc
1379                                 // message, however that would leak that we are the recipient of this payment, so
1380                                 // instead we stay symmetric with the forwarding case, only responding (after a
1381                                 // delay) once they've send us a commitment_signed!
1382
1383                                 PendingForwardHTLCInfo {
1384                                         onion_packet: None,
1385                                         payment_hash: msg.payment_hash.clone(),
1386                                         short_channel_id: 0,
1387                                         prev_short_channel_id: 0,
1388                                         amt_to_forward: next_hop_data.data.amt_to_forward,
1389                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
1390                                 }
1391                         } else {
1392                                 let mut new_packet_data = [0; 20*65];
1393                                 chacha.process(&msg.onion_routing_packet.hop_data[65..], &mut new_packet_data[0..19*65]);
1394                                 chacha.process(&ChannelManager::ZERO[0..65], &mut new_packet_data[19*65..]);
1395
1396                                 let mut new_pubkey = msg.onion_routing_packet.public_key.clone();
1397
1398                                 let blinding_factor = {
1399                                         let mut sha = Sha256::new();
1400                                         sha.input(&new_pubkey.serialize()[..]);
1401                                         sha.input(&shared_secret[..]);
1402                                         let mut res = [0u8; 32];
1403                                         sha.result(&mut res);
1404                                         match SecretKey::from_slice(&self.secp_ctx, &res) {
1405                                                 Err(_) => {
1406                                                         // Return temporary node failure as its technically our issue, not the
1407                                                         // channel's issue.
1408                                                         return_err!("Blinding factor is an invalid private key", 0x2000 | 2, &[0;0]);
1409                                                 },
1410                                                 Ok(key) => key
1411                                         }
1412                                 };
1413
1414                                 match new_pubkey.mul_assign(&self.secp_ctx, &blinding_factor) {
1415                                         Err(_) => {
1416                                                 // Return temporary node failure as its technically our issue, not the
1417                                                 // channel's issue.
1418                                                 return_err!("New blinding factor is an invalid private key", 0x2000 | 2, &[0;0]);
1419                                         },
1420                                         Ok(_) => {}
1421                                 };
1422
1423                                 let outgoing_packet = msgs::OnionPacket {
1424                                         version: 0,
1425                                         public_key: new_pubkey,
1426                                         hop_data: new_packet_data,
1427                                         hmac: next_hop_data.hmac.clone(),
1428                                 };
1429
1430                                 //TODO: Check amt_to_forward and outgoing_cltv_value are within acceptable ranges!
1431
1432                                 PendingForwardHTLCInfo {
1433                                         onion_packet: Some(outgoing_packet),
1434                                         payment_hash: msg.payment_hash.clone(),
1435                                         short_channel_id: next_hop_data.data.short_channel_id,
1436                                         prev_short_channel_id: 0,
1437                                         amt_to_forward: next_hop_data.data.amt_to_forward,
1438                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
1439                                 }
1440                         };
1441
1442                 let mut channel_state_lock = self.channel_state.lock().unwrap();
1443                 let channel_state = channel_state_lock.borrow_parts();
1444
1445                 if pending_forward_info.onion_packet.is_some() { // If short_channel_id is 0 here, we'll reject them in the body here
1446                         let forwarding_id = match channel_state.short_to_id.get(&pending_forward_info.short_channel_id) {
1447                                 None => {
1448                                         return_err!("Don't have available channel for forwarding as requested.", 0x4000 | 10, &[0;0]);
1449                                 },
1450                                 Some(id) => id.clone(),
1451                         };
1452                         let chan = channel_state.by_id.get_mut(&forwarding_id).unwrap();
1453                         if !chan.is_live() {
1454                                 let chan_update = self.get_channel_update(chan).unwrap();
1455                                 return_err!("Forwarding channel is not in a ready state.", 0x4000 | 7, &chan_update.encode_with_len()[..]);
1456                         }
1457                 }
1458
1459                 let claimable_htlcs_entry = channel_state.claimable_htlcs.entry(msg.payment_hash.clone());
1460
1461                 // We dont correctly handle payments that route through us twice on their way to their
1462                 // destination. That's OK since those nodes are probably busted or trying to do network
1463                 // mapping through repeated loops. In either case, we want them to stop talking to us, so
1464                 // we send permanent_node_failure.
1465                 match &claimable_htlcs_entry {
1466                         &hash_map::Entry::Occupied(ref e) => {
1467                                 let mut acceptable_cycle = false;
1468                                 match e.get() {
1469                                         &PendingOutboundHTLC::OutboundRoute { .. } => {
1470                                                 acceptable_cycle = pending_forward_info.short_channel_id == 0;
1471                                         },
1472                                         _ => {},
1473                                 }
1474                                 if !acceptable_cycle {
1475                                         return_err!("Payment looped through us twice", 0x4000 | 0x2000 | 2, &[0;0]);
1476                                 }
1477                         },
1478                         _ => {},
1479                 }
1480
1481                 let (source_short_channel_id, res) = match channel_state.by_id.get_mut(&msg.channel_id) {
1482                         Some(chan) => {
1483                                 if chan.get_their_node_id() != *their_node_id {
1484                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1485                                 }
1486                                 if !chan.is_usable() {
1487                                         return Err(HandleError{err: "Channel not yet available for receiving HTLCs", msg: None});
1488                                 }
1489                                 let short_channel_id = chan.get_short_channel_id().unwrap();
1490                                 pending_forward_info.prev_short_channel_id = short_channel_id;
1491                                 (short_channel_id, chan.update_add_htlc(&msg, pending_forward_info)?)
1492                         },
1493                         None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None}), //TODO: panic?
1494                 };
1495
1496                 match claimable_htlcs_entry {
1497                         hash_map::Entry::Occupied(mut e) => {
1498                                 let outbound_route = e.get_mut();
1499                                 let (route, session_priv) = match outbound_route {
1500                                         &mut PendingOutboundHTLC::OutboundRoute { ref route, ref session_priv } => {
1501                                                 (route.clone(), session_priv.clone())
1502                                         },
1503                                         _ => { panic!("WAT") },
1504                                 };
1505                                 *outbound_route = PendingOutboundHTLC::CycledRoute {
1506                                         source_short_channel_id,
1507                                         incoming_packet_shared_secret: shared_secret,
1508                                         route,
1509                                         session_priv,
1510                                 };
1511                         },
1512                         hash_map::Entry::Vacant(e) => {
1513                                 e.insert(PendingOutboundHTLC::IntermediaryHopData {
1514                                         source_short_channel_id,
1515                                         incoming_packet_shared_secret: shared_secret,
1516                                 });
1517                         }
1518                 }
1519
1520                 Ok(res)
1521         }
1522
1523         fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) -> Result<(), HandleError> {
1524                 //TODO: Delay the claimed_funds relaying just like we do outbound relay!
1525                 // Claim funds first, cause we don't really care if the channel we received the message on
1526                 // is broken, we may have enough info to get our own money!
1527                 self.claim_funds_internal(msg.payment_preimage.clone(), false);
1528
1529                 let monitor = {
1530                         let mut channel_state = self.channel_state.lock().unwrap();
1531                         match channel_state.by_id.get_mut(&msg.channel_id) {
1532                                 Some(chan) => {
1533                                         if chan.get_their_node_id() != *their_node_id {
1534                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1535                                         }
1536                                         chan.update_fulfill_htlc(&msg)?
1537                                 },
1538                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1539                         }
1540                 };
1541                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor) {
1542                         unimplemented!();
1543                 }
1544                 Ok(())
1545         }
1546
1547         fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) -> Result<Option<msgs::HTLCFailChannelUpdate>, HandleError> {
1548                 let mut channel_state = self.channel_state.lock().unwrap();
1549                 let payment_hash = match channel_state.by_id.get_mut(&msg.channel_id) {
1550                         Some(chan) => {
1551                                 if chan.get_their_node_id() != *their_node_id {
1552                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1553                                 }
1554                                 chan.update_fail_htlc(&msg, HTLCFailReason::ErrorPacket { err: msg.reason.clone() })
1555                         },
1556                         None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1557                 }?;
1558
1559                 if let Some(pending_htlc) = channel_state.claimable_htlcs.get(&payment_hash) {
1560                         match pending_htlc {
1561                                 &PendingOutboundHTLC::OutboundRoute { ref route, ref session_priv } => {
1562                                         // Handle packed channel/node updates for passing back for the route handler
1563                                         let mut packet_decrypted = msg.reason.data.clone();
1564                                         let mut res = None;
1565                                         Self::construct_onion_keys_callback(&self.secp_ctx, &route, &session_priv, |shared_secret, _, _, route_hop| {
1566                                                 if res.is_some() { return; }
1567
1568                                                 let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
1569
1570                                                 let mut decryption_tmp = Vec::with_capacity(packet_decrypted.len());
1571                                                 decryption_tmp.resize(packet_decrypted.len(), 0);
1572                                                 let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
1573                                                 chacha.process(&packet_decrypted, &mut decryption_tmp[..]);
1574                                                 packet_decrypted = decryption_tmp;
1575
1576                                                 if let Ok(err_packet) = msgs::DecodedOnionErrorPacket::decode(&packet_decrypted) {
1577                                                         if err_packet.failuremsg.len() >= 2 {
1578                                                                 let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
1579
1580                                                                 let mut hmac = Hmac::new(Sha256::new(), &um);
1581                                                                 hmac.input(&err_packet.encode()[32..]);
1582                                                                 let mut calc_tag = [0u8; 32];
1583                                                                 hmac.raw_result(&mut calc_tag);
1584                                                                 if crypto::util::fixed_time_eq(&calc_tag, &err_packet.hmac) {
1585                                                                         const UNKNOWN_CHAN: u16 = 0x4000|10;
1586                                                                         const TEMP_CHAN_FAILURE: u16 = 0x4000|7;
1587                                                                         match byte_utils::slice_to_be16(&err_packet.failuremsg[0..2]) {
1588                                                                                 TEMP_CHAN_FAILURE => {
1589                                                                                         if err_packet.failuremsg.len() >= 4 {
1590                                                                                                 let update_len = byte_utils::slice_to_be16(&err_packet.failuremsg[2..4]) as usize;
1591                                                                                                 if err_packet.failuremsg.len() >= 4 + update_len {
1592                                                                                                         if let Ok(chan_update) = msgs::ChannelUpdate::decode(&err_packet.failuremsg[4..4 + update_len]) {
1593                                                                                                                 res = Some(msgs::HTLCFailChannelUpdate::ChannelUpdateMessage {
1594                                                                                                                         msg: chan_update,
1595                                                                                                                 });
1596                                                                                                         }
1597                                                                                                 }
1598                                                                                         }
1599                                                                                 },
1600                                                                                 UNKNOWN_CHAN => {
1601                                                                                         // No such next-hop. We know this came from the
1602                                                                                         // current node as the HMAC validated.
1603                                                                                         res = Some(msgs::HTLCFailChannelUpdate::ChannelClosed {
1604                                                                                                 short_channel_id: route_hop.short_channel_id
1605                                                                                         });
1606                                                                                 },
1607                                                                                 _ => {}, //TODO: Enumerate all of these!
1608                                                                         }
1609                                                                 }
1610                                                         }
1611                                                 }
1612                                         }).unwrap();
1613                                         Ok(res)
1614                                 },
1615                                 _ => { Ok(None) },
1616                         }
1617                 } else {
1618                         Ok(None)
1619                 }
1620         }
1621
1622         fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) -> Result<(), HandleError> {
1623                 let mut channel_state = self.channel_state.lock().unwrap();
1624                 match channel_state.by_id.get_mut(&msg.channel_id) {
1625                         Some(chan) => {
1626                                 if chan.get_their_node_id() != *their_node_id {
1627                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1628                                 }
1629                                 chan.update_fail_malformed_htlc(&msg, HTLCFailReason::Reason { failure_code: msg.failure_code, data: Vec::new() })
1630                         },
1631                         None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1632                 }
1633         }
1634
1635         fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>), HandleError> {
1636                 let (revoke_and_ack, commitment_signed, chan_monitor) = {
1637                         let mut channel_state = self.channel_state.lock().unwrap();
1638                         match channel_state.by_id.get_mut(&msg.channel_id) {
1639                                 Some(chan) => {
1640                                         if chan.get_their_node_id() != *their_node_id {
1641                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1642                                         }
1643                                         chan.commitment_signed(&msg)?
1644                                 },
1645                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1646                         }
1647                 };
1648                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1649                         unimplemented!();
1650                 }
1651
1652                 Ok((revoke_and_ack, commitment_signed))
1653         }
1654
1655         fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) -> Result<Option<msgs::CommitmentUpdate>, HandleError> {
1656                 let (res, mut pending_forwards, mut pending_failures, chan_monitor) = {
1657                         let mut channel_state = self.channel_state.lock().unwrap();
1658                         match channel_state.by_id.get_mut(&msg.channel_id) {
1659                                 Some(chan) => {
1660                                         if chan.get_their_node_id() != *their_node_id {
1661                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1662                                         }
1663                                         chan.revoke_and_ack(&msg)?
1664                                 },
1665                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1666                         }
1667                 };
1668                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1669                         unimplemented!();
1670                 }
1671                 for failure in pending_failures.drain(..) {
1672                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &failure.0, failure.1);
1673                 }
1674
1675                 let mut forward_event = None;
1676                 if !pending_forwards.is_empty() {
1677                         let mut channel_state = self.channel_state.lock().unwrap();
1678                         if channel_state.forward_htlcs.is_empty() {
1679                                 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));
1680                                 channel_state.next_forward = forward_event.unwrap();
1681                         }
1682                         for forward_info in pending_forwards.drain(..) {
1683                                 match channel_state.forward_htlcs.entry(forward_info.short_channel_id) {
1684                                         hash_map::Entry::Occupied(mut entry) => {
1685                                                 entry.get_mut().push(forward_info);
1686                                         },
1687                                         hash_map::Entry::Vacant(entry) => {
1688                                                 entry.insert(vec!(forward_info));
1689                                         }
1690                                 }
1691                         }
1692                 }
1693                 match forward_event {
1694                         Some(time) => {
1695                                 let mut pending_events = self.pending_events.lock().unwrap();
1696                                 pending_events.push(events::Event::PendingHTLCsForwardable {
1697                                         time_forwardable: time
1698                                 });
1699                         }
1700                         None => {},
1701                 }
1702
1703                 Ok(res)
1704         }
1705
1706         fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) -> Result<(), HandleError> {
1707                 let mut channel_state = self.channel_state.lock().unwrap();
1708                 match channel_state.by_id.get_mut(&msg.channel_id) {
1709                         Some(chan) => {
1710                                 if chan.get_their_node_id() != *their_node_id {
1711                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1712                                 }
1713                                 chan.update_fee(&*self.fee_estimator, &msg)
1714                         },
1715                         None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1716                 }
1717         }
1718
1719         fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) -> Result<(), HandleError> {
1720                 let (chan_announcement, chan_update) = {
1721                         let mut channel_state = self.channel_state.lock().unwrap();
1722                         match channel_state.by_id.get_mut(&msg.channel_id) {
1723                                 Some(chan) => {
1724                                         if chan.get_their_node_id() != *their_node_id {
1725                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1726                                         }
1727                                         if !chan.is_usable() {
1728                                                 return Err(HandleError{err: "Got an announcement_signatures before we were ready for it", msg: None });
1729                                         }
1730
1731                                         let our_node_id = self.get_our_node_id();
1732                                         let (announcement, our_bitcoin_sig) = chan.get_channel_announcement(our_node_id.clone(), self.genesis_hash.clone())?;
1733
1734                                         let were_node_one = announcement.node_id_1 == our_node_id;
1735                                         let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
1736                                         secp_call!(self.secp_ctx.verify(&msghash, &msg.node_signature, if were_node_one { &announcement.node_id_2 } else { &announcement.node_id_1 }));
1737                                         secp_call!(self.secp_ctx.verify(&msghash, &msg.bitcoin_signature, if were_node_one { &announcement.bitcoin_key_2 } else { &announcement.bitcoin_key_1 }));
1738
1739                                         let our_node_sig = secp_call!(self.secp_ctx.sign(&msghash, &self.our_network_key));
1740
1741                                         (msgs::ChannelAnnouncement {
1742                                                 node_signature_1: if were_node_one { our_node_sig } else { msg.node_signature },
1743                                                 node_signature_2: if were_node_one { msg.node_signature } else { our_node_sig },
1744                                                 bitcoin_signature_1: if were_node_one { our_bitcoin_sig } else { msg.bitcoin_signature },
1745                                                 bitcoin_signature_2: if were_node_one { msg.bitcoin_signature } else { our_bitcoin_sig },
1746                                                 contents: announcement,
1747                                         }, self.get_channel_update(chan).unwrap()) // can only fail if we're not in a ready state
1748                                 },
1749                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1750                         }
1751                 };
1752                 let mut pending_events = self.pending_events.lock().unwrap();
1753                 pending_events.push(events::Event::BroadcastChannelAnnouncement { msg: chan_announcement, update_msg: chan_update });
1754                 Ok(())
1755         }
1756
1757         fn peer_disconnected(&self, their_node_id: &PublicKey, no_connection_possible: bool) {
1758                 let mut new_events = Vec::new();
1759                 {
1760                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1761                         let channel_state = channel_state_lock.borrow_parts();
1762                         let short_to_id = channel_state.short_to_id;
1763                         if no_connection_possible {
1764                                 channel_state.by_id.retain(|_, chan| {
1765                                         if chan.get_their_node_id() == *their_node_id {
1766                                                 if let Some(short_id) = chan.get_short_channel_id() {
1767                                                         short_to_id.remove(&short_id);
1768                                                 }
1769                                                 let txn_to_broadcast = chan.force_shutdown();
1770                                                 for tx in txn_to_broadcast {
1771                                                         self.tx_broadcaster.broadcast_transaction(&tx);
1772                                                 }
1773                                                 if let Ok(update) = self.get_channel_update(&chan) {
1774                                                         new_events.push(events::Event::BroadcastChannelUpdate {
1775                                                                 msg: update
1776                                                         });
1777                                                 }
1778                                                 false
1779                                         } else {
1780                                                 true
1781                                         }
1782                                 });
1783                         } else {
1784                                 for chan in channel_state.by_id {
1785                                         if chan.1.get_their_node_id() == *their_node_id {
1786                                                 //TODO: mark channel disabled (and maybe announce such after a timeout). Also
1787                                                 //fail and wipe any uncommitted outbound HTLCs as those are considered after
1788                                                 //reconnect.
1789                                         }
1790                                 }
1791                         }
1792                 }
1793                 if !new_events.is_empty() {
1794                         let mut pending_events = self.pending_events.lock().unwrap();
1795                         for event in new_events.drain(..) {
1796                                 pending_events.push(event);
1797                         }
1798                 }
1799         }
1800 }
1801
1802 #[cfg(test)]
1803 mod tests {
1804         use chain::chaininterface;
1805         use chain::transaction::OutPoint;
1806         use ln::channelmanager::{ChannelManager,OnionKeys};
1807         use ln::router::{Route, RouteHop, Router};
1808         use ln::msgs;
1809         use ln::msgs::{MsgEncodable,ChannelMessageHandler,RoutingMessageHandler};
1810         use util::test_utils;
1811         use util::events::{Event, EventsProvider};
1812
1813         use bitcoin::util::misc::hex_bytes;
1814         use bitcoin::util::hash::Sha256dHash;
1815         use bitcoin::util::uint::Uint256;
1816         use bitcoin::blockdata::block::BlockHeader;
1817         use bitcoin::blockdata::transaction::{Transaction, TxOut};
1818         use bitcoin::network::constants::Network;
1819         use bitcoin::network::serialize::serialize;
1820         use bitcoin::network::serialize::BitcoinHash;
1821
1822         use secp256k1::Secp256k1;
1823         use secp256k1::key::{PublicKey,SecretKey};
1824
1825         use crypto::sha2::Sha256;
1826         use crypto::digest::Digest;
1827
1828         use rand::{thread_rng,Rng};
1829
1830         use std::collections::HashMap;
1831         use std::default::Default;
1832         use std::sync::{Arc, Mutex};
1833         use std::time::Instant;
1834         use std::mem;
1835
1836         fn build_test_onion_keys() -> Vec<OnionKeys> {
1837                 // Keys from BOLT 4, used in both test vector tests
1838                 let secp_ctx = Secp256k1::new();
1839
1840                 let route = Route {
1841                         hops: vec!(
1842                                         RouteHop {
1843                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]).unwrap(),
1844                                                 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
1845                                         },
1846                                         RouteHop {
1847                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("0324653eac434488002cc06bbfb7f10fe18991e35f9fe4302dbea6d2353dc0ab1c").unwrap()[..]).unwrap(),
1848                                                 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
1849                                         },
1850                                         RouteHop {
1851                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("027f31ebc5462c1fdce1b737ecff52d37d75dea43ce11c74d25aa297165faa2007").unwrap()[..]).unwrap(),
1852                                                 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
1853                                         },
1854                                         RouteHop {
1855                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]).unwrap(),
1856                                                 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
1857                                         },
1858                                         RouteHop {
1859                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("02edabbd16b41c8371b92ef2f04c1185b4f03b6dcd52ba9b78d9d7c89c8f221145").unwrap()[..]).unwrap(),
1860                                                 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
1861                                         },
1862                         ),
1863                 };
1864
1865                 let session_priv = SecretKey::from_slice(&secp_ctx, &hex_bytes("4141414141414141414141414141414141414141414141414141414141414141").unwrap()[..]).unwrap();
1866
1867                 let onion_keys = ChannelManager::construct_onion_keys(&secp_ctx, &route, &session_priv).unwrap();
1868                 assert_eq!(onion_keys.len(), route.hops.len());
1869                 onion_keys
1870         }
1871
1872         #[test]
1873         fn onion_vectors() {
1874                 // Packet creation test vectors from BOLT 4
1875                 let onion_keys = build_test_onion_keys();
1876
1877                 assert_eq!(onion_keys[0].shared_secret[..], hex_bytes("53eb63ea8a3fec3b3cd433b85cd62a4b145e1dda09391b348c4e1cd36a03ea66").unwrap()[..]);
1878                 assert_eq!(onion_keys[0].blinding_factor[..], hex_bytes("2ec2e5da605776054187180343287683aa6a51b4b1c04d6dd49c45d8cffb3c36").unwrap()[..]);
1879                 assert_eq!(onion_keys[0].ephemeral_pubkey.serialize()[..], hex_bytes("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]);
1880                 assert_eq!(onion_keys[0].rho, hex_bytes("ce496ec94def95aadd4bec15cdb41a740c9f2b62347c4917325fcc6fb0453986").unwrap()[..]);
1881                 assert_eq!(onion_keys[0].mu, hex_bytes("b57061dc6d0a2b9f261ac410c8b26d64ac5506cbba30267a649c28c179400eba").unwrap()[..]);
1882
1883                 assert_eq!(onion_keys[1].shared_secret[..], hex_bytes("a6519e98832a0b179f62123b3567c106db99ee37bef036e783263602f3488fae").unwrap()[..]);
1884                 assert_eq!(onion_keys[1].blinding_factor[..], hex_bytes("bf66c28bc22e598cfd574a1931a2bafbca09163df2261e6d0056b2610dab938f").unwrap()[..]);
1885                 assert_eq!(onion_keys[1].ephemeral_pubkey.serialize()[..], hex_bytes("028f9438bfbf7feac2e108d677e3a82da596be706cc1cf342b75c7b7e22bf4e6e2").unwrap()[..]);
1886                 assert_eq!(onion_keys[1].rho, hex_bytes("450ffcabc6449094918ebe13d4f03e433d20a3d28a768203337bc40b6e4b2c59").unwrap()[..]);
1887                 assert_eq!(onion_keys[1].mu, hex_bytes("05ed2b4a3fb023c2ff5dd6ed4b9b6ea7383f5cfe9d59c11d121ec2c81ca2eea9").unwrap()[..]);
1888
1889                 assert_eq!(onion_keys[2].shared_secret[..], hex_bytes("3a6b412548762f0dbccce5c7ae7bb8147d1caf9b5471c34120b30bc9c04891cc").unwrap()[..]);
1890                 assert_eq!(onion_keys[2].blinding_factor[..], hex_bytes("a1f2dadd184eb1627049673f18c6325814384facdee5bfd935d9cb031a1698a5").unwrap()[..]);
1891                 assert_eq!(onion_keys[2].ephemeral_pubkey.serialize()[..], hex_bytes("03bfd8225241ea71cd0843db7709f4c222f62ff2d4516fd38b39914ab6b83e0da0").unwrap()[..]);
1892                 assert_eq!(onion_keys[2].rho, hex_bytes("11bf5c4f960239cb37833936aa3d02cea82c0f39fd35f566109c41f9eac8deea").unwrap()[..]);
1893                 assert_eq!(onion_keys[2].mu, hex_bytes("caafe2820fa00eb2eeb78695ae452eba38f5a53ed6d53518c5c6edf76f3f5b78").unwrap()[..]);
1894
1895                 assert_eq!(onion_keys[3].shared_secret[..], hex_bytes("21e13c2d7cfe7e18836df50872466117a295783ab8aab0e7ecc8c725503ad02d").unwrap()[..]);
1896                 assert_eq!(onion_keys[3].blinding_factor[..], hex_bytes("7cfe0b699f35525029ae0fa437c69d0f20f7ed4e3916133f9cacbb13c82ff262").unwrap()[..]);
1897                 assert_eq!(onion_keys[3].ephemeral_pubkey.serialize()[..], hex_bytes("031dde6926381289671300239ea8e57ffaf9bebd05b9a5b95beaf07af05cd43595").unwrap()[..]);
1898                 assert_eq!(onion_keys[3].rho, hex_bytes("cbe784ab745c13ff5cffc2fbe3e84424aa0fd669b8ead4ee562901a4a4e89e9e").unwrap()[..]);
1899                 assert_eq!(onion_keys[3].mu, hex_bytes("5052aa1b3d9f0655a0932e50d42f0c9ba0705142c25d225515c45f47c0036ee9").unwrap()[..]);
1900
1901                 assert_eq!(onion_keys[4].shared_secret[..], hex_bytes("b5756b9b542727dbafc6765a49488b023a725d631af688fc031217e90770c328").unwrap()[..]);
1902                 assert_eq!(onion_keys[4].blinding_factor[..], hex_bytes("c96e00dddaf57e7edcd4fb5954be5b65b09f17cb6d20651b4e90315be5779205").unwrap()[..]);
1903                 assert_eq!(onion_keys[4].ephemeral_pubkey.serialize()[..], hex_bytes("03a214ebd875aab6ddfd77f22c5e7311d7f77f17a169e599f157bbcdae8bf071f4").unwrap()[..]);
1904                 assert_eq!(onion_keys[4].rho, hex_bytes("034e18b8cc718e8af6339106e706c52d8df89e2b1f7e9142d996acf88df8799b").unwrap()[..]);
1905                 assert_eq!(onion_keys[4].mu, hex_bytes("8e45e5c61c2b24cb6382444db6698727afb063adecd72aada233d4bf273d975a").unwrap()[..]);
1906
1907                 // Test vectors below are flat-out wrong: they claim to set outgoing_cltv_value to non-0 :/
1908                 let payloads = vec!(
1909                         msgs::OnionHopData {
1910                                 realm: 0,
1911                                 data: msgs::OnionRealm0HopData {
1912                                         short_channel_id: 0,
1913                                         amt_to_forward: 0,
1914                                         outgoing_cltv_value: 0,
1915                                 },
1916                                 hmac: [0; 32],
1917                         },
1918                         msgs::OnionHopData {
1919                                 realm: 0,
1920                                 data: msgs::OnionRealm0HopData {
1921                                         short_channel_id: 0x0101010101010101,
1922                                         amt_to_forward: 0x0100000001,
1923                                         outgoing_cltv_value: 0,
1924                                 },
1925                                 hmac: [0; 32],
1926                         },
1927                         msgs::OnionHopData {
1928                                 realm: 0,
1929                                 data: msgs::OnionRealm0HopData {
1930                                         short_channel_id: 0x0202020202020202,
1931                                         amt_to_forward: 0x0200000002,
1932                                         outgoing_cltv_value: 0,
1933                                 },
1934                                 hmac: [0; 32],
1935                         },
1936                         msgs::OnionHopData {
1937                                 realm: 0,
1938                                 data: msgs::OnionRealm0HopData {
1939                                         short_channel_id: 0x0303030303030303,
1940                                         amt_to_forward: 0x0300000003,
1941                                         outgoing_cltv_value: 0,
1942                                 },
1943                                 hmac: [0; 32],
1944                         },
1945                         msgs::OnionHopData {
1946                                 realm: 0,
1947                                 data: msgs::OnionRealm0HopData {
1948                                         short_channel_id: 0x0404040404040404,
1949                                         amt_to_forward: 0x0400000004,
1950                                         outgoing_cltv_value: 0,
1951                                 },
1952                                 hmac: [0; 32],
1953                         },
1954                 );
1955
1956                 let packet = ChannelManager::construct_onion_packet(payloads, onion_keys, hex_bytes("4242424242424242424242424242424242424242424242424242424242424242").unwrap()).unwrap();
1957                 // Just check the final packet encoding, as it includes all the per-hop vectors in it
1958                 // anyway...
1959                 assert_eq!(packet.encode(), hex_bytes("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").unwrap());
1960         }
1961
1962         #[test]
1963         fn test_failure_packet_onion() {
1964                 // Returning Errors test vectors from BOLT 4
1965
1966                 let onion_keys = build_test_onion_keys();
1967                 let onion_error = ChannelManager::build_failure_packet(&onion_keys[4].shared_secret, 0x2002, &[0; 0]);
1968                 assert_eq!(onion_error.encode(), hex_bytes("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").unwrap());
1969
1970                 let onion_packet_1 = ChannelManager::encrypt_failure_packet(&onion_keys[4].shared_secret, &onion_error.encode()[..]);
1971                 assert_eq!(onion_packet_1.data, hex_bytes("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").unwrap());
1972
1973                 let onion_packet_2 = ChannelManager::encrypt_failure_packet(&onion_keys[3].shared_secret, &onion_packet_1.data[..]);
1974                 assert_eq!(onion_packet_2.data, hex_bytes("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").unwrap());
1975
1976                 let onion_packet_3 = ChannelManager::encrypt_failure_packet(&onion_keys[2].shared_secret, &onion_packet_2.data[..]);
1977                 assert_eq!(onion_packet_3.data, hex_bytes("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").unwrap());
1978
1979                 let onion_packet_4 = ChannelManager::encrypt_failure_packet(&onion_keys[1].shared_secret, &onion_packet_3.data[..]);
1980                 assert_eq!(onion_packet_4.data, hex_bytes("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").unwrap());
1981
1982                 let onion_packet_5 = ChannelManager::encrypt_failure_packet(&onion_keys[0].shared_secret, &onion_packet_4.data[..]);
1983                 assert_eq!(onion_packet_5.data, hex_bytes("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").unwrap());
1984         }
1985
1986         fn confirm_transaction(chain: &chaininterface::ChainWatchInterfaceUtil, tx: &Transaction, chan_id: u32) {
1987                 let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
1988                 chain.block_connected_checked(&header, 1, &[tx; 1], &[chan_id; 1]);
1989                 for i in 2..100 {
1990                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
1991                         chain.block_connected_checked(&header, i, &[tx; 0], &[0; 0]);
1992                 }
1993         }
1994
1995         struct Node {
1996                 feeest: Arc<test_utils::TestFeeEstimator>,
1997                 chain_monitor: Arc<chaininterface::ChainWatchInterfaceUtil>,
1998                 tx_broadcaster: Arc<test_utils::TestBroadcaster>,
1999                 chan_monitor: Arc<test_utils::TestChannelMonitor>,
2000                 node_id: SecretKey,
2001                 node: Arc<ChannelManager>,
2002                 router: Router,
2003         }
2004
2005         static mut CHAN_COUNT: u32 = 0;
2006         fn create_chan_between_nodes(node_a: &Node, node_b: &Node) -> (msgs::ChannelAnnouncement, msgs::ChannelUpdate, msgs::ChannelUpdate, Uint256, Transaction) {
2007                 let open_chan = node_a.node.create_channel(node_b.node.get_our_node_id(), 100000, 42).unwrap();
2008                 let accept_chan = node_b.node.handle_open_channel(&node_a.node.get_our_node_id(), &open_chan).unwrap();
2009                 node_a.node.handle_accept_channel(&node_b.node.get_our_node_id(), &accept_chan).unwrap();
2010
2011                 let chan_id = unsafe { CHAN_COUNT };
2012                 let tx;
2013                 let funding_output;
2014
2015                 let events_1 = node_a.node.get_and_clear_pending_events();
2016                 assert_eq!(events_1.len(), 1);
2017                 match events_1[0] {
2018                         Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, user_channel_id } => {
2019                                 assert_eq!(*channel_value_satoshis, 100000);
2020                                 assert_eq!(user_channel_id, 42);
2021
2022                                 tx = Transaction { version: chan_id as u32, lock_time: 0, input: Vec::new(), output: vec![TxOut {
2023                                         value: *channel_value_satoshis, script_pubkey: output_script.clone(),
2024                                 }]};
2025                                 funding_output = OutPoint::new(Sha256dHash::from_data(&serialize(&tx).unwrap()[..]), 0);
2026
2027                                 node_a.node.funding_transaction_generated(&temporary_channel_id, funding_output);
2028                                 let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
2029                                 assert_eq!(added_monitors.len(), 1);
2030                                 assert_eq!(added_monitors[0].0, funding_output);
2031                                 added_monitors.clear();
2032                         },
2033                         _ => panic!("Unexpected event"),
2034                 }
2035
2036                 let events_2 = node_a.node.get_and_clear_pending_events();
2037                 assert_eq!(events_2.len(), 1);
2038                 let funding_signed = match events_2[0] {
2039                         Event::SendFundingCreated { ref node_id, ref msg } => {
2040                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2041                                 let res = node_b.node.handle_funding_created(&node_a.node.get_our_node_id(), msg).unwrap();
2042                                 let mut added_monitors = node_b.chan_monitor.added_monitors.lock().unwrap();
2043                                 assert_eq!(added_monitors.len(), 1);
2044                                 assert_eq!(added_monitors[0].0, funding_output);
2045                                 added_monitors.clear();
2046                                 res
2047                         },
2048                         _ => panic!("Unexpected event"),
2049                 };
2050
2051                 node_a.node.handle_funding_signed(&node_b.node.get_our_node_id(), &funding_signed).unwrap();
2052                 {
2053                         let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
2054                         assert_eq!(added_monitors.len(), 1);
2055                         assert_eq!(added_monitors[0].0, funding_output);
2056                         added_monitors.clear();
2057                 }
2058
2059                 let events_3 = node_a.node.get_and_clear_pending_events();
2060                 assert_eq!(events_3.len(), 1);
2061                 match events_3[0] {
2062                         Event::FundingBroadcastSafe { ref funding_txo, user_channel_id } => {
2063                                 assert_eq!(user_channel_id, 42);
2064                                 assert_eq!(*funding_txo, funding_output);
2065                         },
2066                         _ => panic!("Unexpected event"),
2067                 };
2068
2069                 confirm_transaction(&node_a.chain_monitor, &tx, chan_id);
2070                 let events_4 = node_a.node.get_and_clear_pending_events();
2071                 assert_eq!(events_4.len(), 1);
2072                 match events_4[0] {
2073                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
2074                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2075                                 assert!(announcement_sigs.is_none());
2076                                 node_b.node.handle_funding_locked(&node_a.node.get_our_node_id(), msg).unwrap()
2077                         },
2078                         _ => panic!("Unexpected event"),
2079                 };
2080
2081                 let channel_id;
2082
2083                 confirm_transaction(&node_b.chain_monitor, &tx, chan_id);
2084                 let events_5 = node_b.node.get_and_clear_pending_events();
2085                 assert_eq!(events_5.len(), 1);
2086                 let as_announcement_sigs = match events_5[0] {
2087                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
2088                                 assert_eq!(*node_id, node_a.node.get_our_node_id());
2089                                 channel_id = msg.channel_id.clone();
2090                                 let as_announcement_sigs = node_a.node.handle_funding_locked(&node_b.node.get_our_node_id(), msg).unwrap().unwrap();
2091                                 node_a.node.handle_announcement_signatures(&node_b.node.get_our_node_id(), &(*announcement_sigs).clone().unwrap()).unwrap();
2092                                 as_announcement_sigs
2093                         },
2094                         _ => panic!("Unexpected event"),
2095                 };
2096
2097                 let events_6 = node_a.node.get_and_clear_pending_events();
2098                 assert_eq!(events_6.len(), 1);
2099                 let (announcement, as_update) = match events_6[0] {
2100                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
2101                                 (msg, update_msg)
2102                         },
2103                         _ => panic!("Unexpected event"),
2104                 };
2105
2106                 node_b.node.handle_announcement_signatures(&node_a.node.get_our_node_id(), &as_announcement_sigs).unwrap();
2107                 let events_7 = node_b.node.get_and_clear_pending_events();
2108                 assert_eq!(events_7.len(), 1);
2109                 let bs_update = match events_7[0] {
2110                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
2111                                 assert!(*announcement == *msg);
2112                                 update_msg
2113                         },
2114                         _ => panic!("Unexpected event"),
2115                 };
2116
2117                 unsafe {
2118                         CHAN_COUNT += 1;
2119                 }
2120
2121                 ((*announcement).clone(), (*as_update).clone(), (*bs_update).clone(), channel_id, tx)
2122         }
2123
2124         fn create_announced_chan_between_nodes(nodes: &Vec<Node>, a: usize, b: usize) -> (msgs::ChannelUpdate, msgs::ChannelUpdate, Uint256, Transaction) {
2125                 let chan_announcement = create_chan_between_nodes(&nodes[a], &nodes[b]);
2126                 for node in nodes {
2127                         assert!(node.router.handle_channel_announcement(&chan_announcement.0).unwrap());
2128                         node.router.handle_channel_update(&chan_announcement.1).unwrap();
2129                         node.router.handle_channel_update(&chan_announcement.2).unwrap();
2130                 }
2131                 (chan_announcement.1, chan_announcement.2, chan_announcement.3, chan_announcement.4)
2132         }
2133
2134         fn close_channel(outbound_node: &Node, inbound_node: &Node, channel_id: &Uint256, funding_tx: Transaction, close_inbound_first: bool) -> (msgs::ChannelUpdate, msgs::ChannelUpdate) {
2135                 let (node_a, broadcaster_a) = if close_inbound_first { (&inbound_node.node, &inbound_node.tx_broadcaster) } else { (&outbound_node.node, &outbound_node.tx_broadcaster) };
2136                 let (node_b, broadcaster_b) = if close_inbound_first { (&outbound_node.node, &outbound_node.tx_broadcaster) } else { (&inbound_node.node, &inbound_node.tx_broadcaster) };
2137                 let (tx_a, tx_b);
2138
2139                 let shutdown_a = node_a.close_channel(channel_id).unwrap();
2140                 let (shutdown_b, mut closing_signed_b) = node_b.handle_shutdown(&node_a.get_our_node_id(), &shutdown_a).unwrap();
2141                 if !close_inbound_first {
2142                         assert!(closing_signed_b.is_none());
2143                 }
2144                 let (empty_a, mut closing_signed_a) = node_a.handle_shutdown(&node_b.get_our_node_id(), &shutdown_b.unwrap()).unwrap();
2145                 assert!(empty_a.is_none());
2146                 if close_inbound_first {
2147                         assert!(closing_signed_a.is_none());
2148                         closing_signed_a = node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
2149                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
2150                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
2151
2152                         let empty_b = node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
2153                         assert!(empty_b.is_none());
2154                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
2155                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
2156                 } else {
2157                         closing_signed_b = node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
2158                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
2159                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
2160
2161                         let empty_a2 = node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
2162                         assert!(empty_a2.is_none());
2163                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
2164                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
2165                 }
2166                 assert_eq!(tx_a, tx_b);
2167                 let mut funding_tx_map = HashMap::new();
2168                 funding_tx_map.insert(funding_tx.txid(), funding_tx);
2169                 tx_a.verify(&funding_tx_map).unwrap();
2170
2171                 let events_1 = node_a.get_and_clear_pending_events();
2172                 assert_eq!(events_1.len(), 1);
2173                 let as_update = match events_1[0] {
2174                         Event::BroadcastChannelUpdate { ref msg } => {
2175                                 msg.clone()
2176                         },
2177                         _ => panic!("Unexpected event"),
2178                 };
2179
2180                 let events_2 = node_b.get_and_clear_pending_events();
2181                 assert_eq!(events_2.len(), 1);
2182                 let bs_update = match events_2[0] {
2183                         Event::BroadcastChannelUpdate { ref msg } => {
2184                                 msg.clone()
2185                         },
2186                         _ => panic!("Unexpected event"),
2187                 };
2188
2189                 (as_update, bs_update)
2190         }
2191
2192         struct SendEvent {
2193                 node_id: PublicKey,
2194                 msgs: Vec<msgs::UpdateAddHTLC>,
2195                 commitment_msg: msgs::CommitmentSigned,
2196         }
2197         impl SendEvent {
2198                 fn from_event(event: Event) -> SendEvent {
2199                         match event {
2200                                 Event::SendHTLCs { node_id, msgs, commitment_msg } => {
2201                                         SendEvent { node_id: node_id, msgs: msgs, commitment_msg: commitment_msg }
2202                                 },
2203                                 _ => panic!("Unexpected event type!"),
2204                         }
2205                 }
2206         }
2207
2208         static mut PAYMENT_COUNT: u8 = 0;
2209         fn send_along_route(origin_node: &Node, route: Route, expected_route: &[&Node], recv_value: u64) -> ([u8; 32], [u8; 32]) {
2210                 let our_payment_preimage = unsafe { [PAYMENT_COUNT; 32] };
2211                 unsafe { PAYMENT_COUNT += 1 };
2212                 let our_payment_hash = {
2213                         let mut sha = Sha256::new();
2214                         sha.input(&our_payment_preimage[..]);
2215                         let mut ret = [0; 32];
2216                         sha.result(&mut ret);
2217                         ret
2218                 };
2219
2220                 let mut payment_event = {
2221                         origin_node.node.send_payment(route, our_payment_hash).unwrap();
2222                         {
2223                                 let mut added_monitors = origin_node.chan_monitor.added_monitors.lock().unwrap();
2224                                 assert_eq!(added_monitors.len(), 1);
2225                                 added_monitors.clear();
2226                         }
2227
2228                         let mut events = origin_node.node.get_and_clear_pending_events();
2229                         assert_eq!(events.len(), 1);
2230                         SendEvent::from_event(events.remove(0))
2231                 };
2232                 let mut prev_node = origin_node;
2233
2234                 for (idx, &node) in expected_route.iter().enumerate() {
2235                         assert_eq!(node.node.get_our_node_id(), payment_event.node_id);
2236
2237                         node.node.handle_update_add_htlc(&prev_node.node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
2238                         {
2239                                 let added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2240                                 assert_eq!(added_monitors.len(), 0);
2241                         }
2242
2243                         let revoke_and_ack = node.node.handle_commitment_signed(&prev_node.node.get_our_node_id(), &payment_event.commitment_msg).unwrap();
2244                         {
2245                                 let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2246                                 assert_eq!(added_monitors.len(), 1);
2247                                 added_monitors.clear();
2248                         }
2249                         assert!(prev_node.node.handle_revoke_and_ack(&node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2250                         let prev_revoke_and_ack = prev_node.node.handle_commitment_signed(&node.node.get_our_node_id(), &revoke_and_ack.1.unwrap()).unwrap();
2251                         {
2252                                 let mut added_monitors = prev_node.chan_monitor.added_monitors.lock().unwrap();
2253                                 assert_eq!(added_monitors.len(), 2);
2254                                 added_monitors.clear();
2255                         }
2256                         assert!(node.node.handle_revoke_and_ack(&prev_node.node.get_our_node_id(), &prev_revoke_and_ack.0).unwrap().is_none());
2257                         assert!(prev_revoke_and_ack.1.is_none());
2258                         {
2259                                 let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2260                                 assert_eq!(added_monitors.len(), 1);
2261                                 added_monitors.clear();
2262                         }
2263
2264                         let events_1 = node.node.get_and_clear_pending_events();
2265                         assert_eq!(events_1.len(), 1);
2266                         match events_1[0] {
2267                                 Event::PendingHTLCsForwardable { .. } => { },
2268                                 _ => panic!("Unexpected event"),
2269                         };
2270
2271                         node.node.channel_state.lock().unwrap().next_forward = Instant::now();
2272                         node.node.process_pending_htlc_forward();
2273
2274                         let mut events_2 = node.node.get_and_clear_pending_events();
2275                         assert_eq!(events_2.len(), 1);
2276                         if idx == expected_route.len() - 1 {
2277                                 match events_2[0] {
2278                                         Event::PaymentReceived { ref payment_hash, amt } => {
2279                                                 assert_eq!(our_payment_hash, *payment_hash);
2280                                                 assert_eq!(amt, recv_value);
2281                                         },
2282                                         _ => panic!("Unexpected event"),
2283                                 }
2284                         } else {
2285                                 {
2286                                         let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2287                                         assert_eq!(added_monitors.len(), 1);
2288                                         added_monitors.clear();
2289                                 }
2290                                 payment_event = SendEvent::from_event(events_2.remove(0));
2291                                 assert_eq!(payment_event.msgs.len(), 1);
2292                         }
2293
2294                         prev_node = node;
2295                 }
2296
2297                 (our_payment_preimage, our_payment_hash)
2298         }
2299
2300         fn claim_payment(origin_node: &Node, expected_route: &[&Node], our_payment_preimage: [u8; 32]) {
2301                 assert!(expected_route.last().unwrap().node.claim_funds(our_payment_preimage));
2302                 {
2303                         let mut added_monitors = expected_route.last().unwrap().chan_monitor.added_monitors.lock().unwrap();
2304                         assert_eq!(added_monitors.len(), 1);
2305                         added_monitors.clear();
2306                 }
2307
2308                 let mut next_msgs: Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned)> = None;
2309                 macro_rules! update_fulfill_dance {
2310                         ($node: expr, $prev_node: expr, $last_node: expr) => {
2311                                 {
2312                                         $node.node.handle_update_fulfill_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
2313                                         {
2314                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2315                                                 if $last_node {
2316                                                         assert_eq!(added_monitors.len(), 1);
2317                                                 } else {
2318                                                         assert_eq!(added_monitors.len(), 2);
2319                                                         assert!(added_monitors[0].0 != added_monitors[1].0);
2320                                                 }
2321                                                 added_monitors.clear();
2322                                         }
2323                                         let revoke_and_commit = $node.node.handle_commitment_signed(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().1).unwrap();
2324                                         {
2325                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2326                                                 assert_eq!(added_monitors.len(), 1);
2327                                                 added_monitors.clear();
2328                                         }
2329                                         assert!($prev_node.node.handle_revoke_and_ack(&$node.node.get_our_node_id(), &revoke_and_commit.0).unwrap().is_none());
2330                                         let revoke_and_ack = $prev_node.node.handle_commitment_signed(&$node.node.get_our_node_id(), &revoke_and_commit.1.unwrap()).unwrap();
2331                                         assert!(revoke_and_ack.1.is_none());
2332                                         {
2333                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2334                                                 assert_eq!(added_monitors.len(), 2);
2335                                                 added_monitors.clear();
2336                                         }
2337                                         assert!($node.node.handle_revoke_and_ack(&$prev_node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2338                                         {
2339                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2340                                                 assert_eq!(added_monitors.len(), 1);
2341                                                 added_monitors.clear();
2342                                         }
2343                                 }
2344                         }
2345                 }
2346
2347                 let mut expected_next_node = expected_route.last().unwrap().node.get_our_node_id();
2348                 let mut prev_node = expected_route.last().unwrap();
2349                 for node in expected_route.iter().rev() {
2350                         assert_eq!(expected_next_node, node.node.get_our_node_id());
2351                         if next_msgs.is_some() {
2352                                 update_fulfill_dance!(node, prev_node, false);
2353                         }
2354
2355                         let events = node.node.get_and_clear_pending_events();
2356                         assert_eq!(events.len(), 1);
2357                         match events[0] {
2358                                 Event::SendFulfillHTLC { ref node_id, ref msg, ref commitment_msg } => {
2359                                         expected_next_node = node_id.clone();
2360                                         next_msgs = Some((msg.clone(), commitment_msg.clone()));
2361                                 },
2362                                 _ => panic!("Unexpected event"),
2363                         };
2364
2365                         prev_node = node;
2366                 }
2367
2368                 assert_eq!(expected_next_node, origin_node.node.get_our_node_id());
2369                 update_fulfill_dance!(origin_node, expected_route.first().unwrap(), true);
2370
2371                 let events = origin_node.node.get_and_clear_pending_events();
2372                 assert_eq!(events.len(), 1);
2373                 match events[0] {
2374                         Event::PaymentSent { payment_preimage } => {
2375                                 assert_eq!(payment_preimage, our_payment_preimage);
2376                         },
2377                         _ => panic!("Unexpected event"),
2378                 }
2379         }
2380
2381         const TEST_FINAL_CLTV: u32 = 32;
2382
2383         fn route_payment(origin_node: &Node, expected_route: &[&Node], recv_value: u64) -> ([u8; 32], [u8; 32]) {
2384                 let route = origin_node.router.get_route(&expected_route.last().unwrap().node.get_our_node_id(), &Vec::new(), recv_value, TEST_FINAL_CLTV).unwrap();
2385                 assert_eq!(route.hops.len(), expected_route.len());
2386                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
2387                         assert_eq!(hop.pubkey, node.node.get_our_node_id());
2388                 }
2389
2390                 send_along_route(origin_node, route, expected_route, recv_value)
2391         }
2392
2393         fn route_over_limit(origin_node: &Node, expected_route: &[&Node], recv_value: u64) {
2394                 let route = origin_node.router.get_route(&expected_route.last().unwrap().node.get_our_node_id(), &Vec::new(), recv_value, TEST_FINAL_CLTV).unwrap();
2395                 assert_eq!(route.hops.len(), expected_route.len());
2396                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
2397                         assert_eq!(hop.pubkey, node.node.get_our_node_id());
2398                 }
2399
2400                 let our_payment_preimage = unsafe { [PAYMENT_COUNT; 32] };
2401                 unsafe { PAYMENT_COUNT += 1 };
2402                 let our_payment_hash = {
2403                         let mut sha = Sha256::new();
2404                         sha.input(&our_payment_preimage[..]);
2405                         let mut ret = [0; 32];
2406                         sha.result(&mut ret);
2407                         ret
2408                 };
2409
2410                 let err = origin_node.node.send_payment(route, our_payment_hash).err().unwrap();
2411                 assert_eq!(err.err, "Cannot send value that would put us over our max HTLC value in flight");
2412         }
2413
2414         fn send_payment(origin: &Node, expected_route: &[&Node], recv_value: u64) {
2415                 let our_payment_preimage = route_payment(&origin, expected_route, recv_value).0;
2416                 claim_payment(&origin, expected_route, our_payment_preimage);
2417         }
2418
2419         fn fail_payment(origin_node: &Node, expected_route: &[&Node], our_payment_hash: [u8; 32]) {
2420                 assert!(expected_route.last().unwrap().node.fail_htlc_backwards(&our_payment_hash));
2421                 {
2422                         let mut added_monitors = expected_route.last().unwrap().chan_monitor.added_monitors.lock().unwrap();
2423                         assert_eq!(added_monitors.len(), 1);
2424                         added_monitors.clear();
2425                 }
2426
2427                 let mut next_msgs: Option<(msgs::UpdateFailHTLC, msgs::CommitmentSigned)> = None;
2428                 macro_rules! update_fail_dance {
2429                         ($node: expr, $prev_node: expr, $last_node: expr) => {
2430                                 {
2431                                         $node.node.handle_update_fail_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
2432                                         let revoke_and_commit = $node.node.handle_commitment_signed(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().1).unwrap();
2433
2434                                         {
2435                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2436                                                 assert_eq!(added_monitors.len(), 1);
2437                                                 added_monitors.clear();
2438                                         }
2439                                         assert!($prev_node.node.handle_revoke_and_ack(&$node.node.get_our_node_id(), &revoke_and_commit.0).unwrap().is_none());
2440                                         {
2441                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2442                                                 assert_eq!(added_monitors.len(), 1);
2443                                                 added_monitors.clear();
2444                                         }
2445                                         let revoke_and_ack = $prev_node.node.handle_commitment_signed(&$node.node.get_our_node_id(), &revoke_and_commit.1.unwrap()).unwrap();
2446                                         {
2447                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2448                                                 assert_eq!(added_monitors.len(), 1);
2449                                                 added_monitors.clear();
2450                                         }
2451                                         assert!(revoke_and_ack.1.is_none());
2452                                         assert!($node.node.get_and_clear_pending_events().is_empty());
2453                                         assert!($node.node.handle_revoke_and_ack(&$prev_node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2454                                         {
2455                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2456                                                 if $last_node {
2457                                                         assert_eq!(added_monitors.len(), 1);
2458                                                 } else {
2459                                                         assert_eq!(added_monitors.len(), 2);
2460                                                         assert!(added_monitors[0].0 != added_monitors[1].0);
2461                                                 }
2462                                                 added_monitors.clear();
2463                                         }
2464                                 }
2465                         }
2466                 }
2467
2468                 let mut expected_next_node = expected_route.last().unwrap().node.get_our_node_id();
2469                 let mut prev_node = expected_route.last().unwrap();
2470                 for node in expected_route.iter().rev() {
2471                         assert_eq!(expected_next_node, node.node.get_our_node_id());
2472                         if next_msgs.is_some() {
2473                                 update_fail_dance!(node, prev_node, false);
2474                         }
2475
2476                         let events = node.node.get_and_clear_pending_events();
2477                         assert_eq!(events.len(), 1);
2478                         match events[0] {
2479                                 Event::SendFailHTLC { ref node_id, ref msg, ref commitment_msg } => {
2480                                         expected_next_node = node_id.clone();
2481                                         next_msgs = Some((msg.clone(), commitment_msg.clone()));
2482                                 },
2483                                 _ => panic!("Unexpected event"),
2484                         };
2485
2486                         prev_node = node;
2487                 }
2488
2489                 assert_eq!(expected_next_node, origin_node.node.get_our_node_id());
2490                 update_fail_dance!(origin_node, expected_route.first().unwrap(), true);
2491
2492                 let events = origin_node.node.get_and_clear_pending_events();
2493                 assert_eq!(events.len(), 1);
2494                 match events[0] {
2495                         Event::PaymentFailed { payment_hash } => {
2496                                 assert_eq!(payment_hash, our_payment_hash);
2497                         },
2498                         _ => panic!("Unexpected event"),
2499                 }
2500         }
2501
2502         fn create_network(node_count: usize) -> Vec<Node> {
2503                 let mut nodes = Vec::new();
2504                 let mut rng = thread_rng();
2505                 let secp_ctx = Secp256k1::new();
2506
2507                 for _ in 0..node_count {
2508                         let feeest = Arc::new(test_utils::TestFeeEstimator { sat_per_vbyte: 1 });
2509                         let chain_monitor = Arc::new(chaininterface::ChainWatchInterfaceUtil::new());
2510                         let tx_broadcaster = Arc::new(test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new())});
2511                         let chan_monitor = Arc::new(test_utils::TestChannelMonitor::new(chain_monitor.clone(), tx_broadcaster.clone()));
2512                         let node_id = {
2513                                 let mut key_slice = [0; 32];
2514                                 rng.fill_bytes(&mut key_slice);
2515                                 SecretKey::from_slice(&secp_ctx, &key_slice).unwrap()
2516                         };
2517                         let node = ChannelManager::new(node_id.clone(), 0, true, Network::Testnet, feeest.clone(), chan_monitor.clone(), chain_monitor.clone(), tx_broadcaster.clone()).unwrap();
2518                         let router = Router::new(PublicKey::from_secret_key(&secp_ctx, &node_id).unwrap());
2519                         nodes.push(Node { feeest, chain_monitor, tx_broadcaster, chan_monitor, node_id, node, router });
2520                 }
2521
2522                 nodes
2523         }
2524
2525         #[test]
2526         fn fake_network_test() {
2527                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
2528                 // tests that payments get routed and transactions broadcast in semi-reasonable ways.
2529                 let nodes = create_network(4);
2530
2531                 // Create some initial channels
2532                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
2533                 let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2);
2534                 let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3);
2535
2536                 // Rebalance the network a bit by relaying one payment through all the channels...
2537                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2538                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2539                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2540                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2541
2542                 // Send some more payments
2543                 send_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 1000000);
2544                 send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1], &nodes[0])[..], 1000000);
2545                 send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1])[..], 1000000);
2546
2547                 // Test failure packets
2548                 let payment_hash_1 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 1000000).1;
2549                 fail_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], payment_hash_1);
2550
2551                 // Add a new channel that skips 3
2552                 let chan_4 = create_announced_chan_between_nodes(&nodes, 1, 3);
2553
2554                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 1000000);
2555                 send_payment(&nodes[2], &vec!(&nodes[3])[..], 1000000);
2556                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2557                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2558                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2559                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2560                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2561
2562                 // Do some rebalance loop payments, simultaneously
2563                 let mut hops = Vec::with_capacity(3);
2564                 hops.push(RouteHop {
2565                         pubkey: nodes[2].node.get_our_node_id(),
2566                         short_channel_id: chan_2.0.contents.short_channel_id,
2567                         fee_msat: 0,
2568                         cltv_expiry_delta: chan_3.0.contents.cltv_expiry_delta as u32
2569                 });
2570                 hops.push(RouteHop {
2571                         pubkey: nodes[3].node.get_our_node_id(),
2572                         short_channel_id: chan_3.0.contents.short_channel_id,
2573                         fee_msat: 0,
2574                         cltv_expiry_delta: chan_4.1.contents.cltv_expiry_delta as u32
2575                 });
2576                 hops.push(RouteHop {
2577                         pubkey: nodes[1].node.get_our_node_id(),
2578                         short_channel_id: chan_4.0.contents.short_channel_id,
2579                         fee_msat: 1000000,
2580                         cltv_expiry_delta: TEST_FINAL_CLTV,
2581                 });
2582                 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;
2583                 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;
2584                 let payment_preimage_1 = send_along_route(&nodes[1], Route { hops }, &vec!(&nodes[2], &nodes[3], &nodes[1])[..], 1000000).0;
2585
2586                 let mut hops = Vec::with_capacity(3);
2587                 hops.push(RouteHop {
2588                         pubkey: nodes[3].node.get_our_node_id(),
2589                         short_channel_id: chan_4.0.contents.short_channel_id,
2590                         fee_msat: 0,
2591                         cltv_expiry_delta: chan_3.1.contents.cltv_expiry_delta as u32
2592                 });
2593                 hops.push(RouteHop {
2594                         pubkey: nodes[2].node.get_our_node_id(),
2595                         short_channel_id: chan_3.0.contents.short_channel_id,
2596                         fee_msat: 0,
2597                         cltv_expiry_delta: chan_2.1.contents.cltv_expiry_delta as u32
2598                 });
2599                 hops.push(RouteHop {
2600                         pubkey: nodes[1].node.get_our_node_id(),
2601                         short_channel_id: chan_2.0.contents.short_channel_id,
2602                         fee_msat: 1000000,
2603                         cltv_expiry_delta: TEST_FINAL_CLTV,
2604                 });
2605                 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;
2606                 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;
2607                 let payment_hash_2 = send_along_route(&nodes[1], Route { hops }, &vec!(&nodes[3], &nodes[2], &nodes[1])[..], 1000000).1;
2608
2609                 // Claim the rebalances...
2610                 fail_payment(&nodes[1], &vec!(&nodes[3], &nodes[2], &nodes[1])[..], payment_hash_2);
2611                 claim_payment(&nodes[1], &vec!(&nodes[2], &nodes[3], &nodes[1])[..], payment_preimage_1);
2612
2613                 // Add a duplicate new channel from 2 to 4
2614                 let chan_5 = create_announced_chan_between_nodes(&nodes, 1, 3);
2615
2616                 // Send some payments across both channels
2617                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2618                 let payment_preimage_4 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2619                 let payment_preimage_5 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2620
2621                 route_over_limit(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000);
2622
2623                 //TODO: Test that routes work again here as we've been notified that the channel is full
2624
2625                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_3);
2626                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_4);
2627                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_5);
2628
2629                 // Close down the channels...
2630                 close_channel(&nodes[0], &nodes[1], &chan_1.2, chan_1.3, true);
2631                 close_channel(&nodes[1], &nodes[2], &chan_2.2, chan_2.3, false);
2632                 close_channel(&nodes[2], &nodes[3], &chan_3.2, chan_3.3, true);
2633                 close_channel(&nodes[1], &nodes[3], &chan_4.2, chan_4.3, false);
2634                 close_channel(&nodes[1], &nodes[3], &chan_5.2, chan_5.3, false);
2635
2636                 // Check that we processed all pending events
2637                 for node in nodes {
2638                         assert_eq!(node.node.get_and_clear_pending_events().len(), 0);
2639                         assert_eq!(node.chan_monitor.added_monitors.lock().unwrap().len(), 0);
2640                 }
2641         }
2642
2643         #[derive(PartialEq)]
2644         enum HTLCType { NONE, TIMEOUT, SUCCESS }
2645         fn test_txn_broadcast(node: &Node, chan: &(msgs::ChannelUpdate, msgs::ChannelUpdate, Uint256, Transaction), commitment_tx: Option<Transaction>, has_htlc_tx: HTLCType) -> Vec<Transaction> {
2646                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
2647                 assert!(node_txn.len() >= if commitment_tx.is_some() { 0 } else { 1 } + if has_htlc_tx == HTLCType::NONE { 0 } else { 1 });
2648
2649                 let mut res = Vec::with_capacity(2);
2650
2651                 if let Some(explicit_tx) = commitment_tx {
2652                         res.push(explicit_tx.clone());
2653                 } else {
2654                         for tx in node_txn.iter() {
2655                                 if tx.input.len() == 1 && tx.input[0].prev_hash == chan.3.txid() {
2656                                         let mut funding_tx_map = HashMap::new();
2657                                         funding_tx_map.insert(chan.3.txid(), chan.3.clone());
2658                                         tx.verify(&funding_tx_map).unwrap();
2659                                         res.push(tx.clone());
2660                                 }
2661                         }
2662                 }
2663                 assert_eq!(res.len(), 1);
2664
2665                 if has_htlc_tx != HTLCType::NONE {
2666                         for tx in node_txn.iter() {
2667                                 if tx.input.len() == 1 && tx.input[0].prev_hash == res[0].txid() {
2668                                         let mut funding_tx_map = HashMap::new();
2669                                         funding_tx_map.insert(res[0].txid(), res[0].clone());
2670                                         tx.verify(&funding_tx_map).unwrap();
2671                                         if has_htlc_tx == HTLCType::TIMEOUT {
2672                                                 assert!(tx.lock_time != 0);
2673                                         } else {
2674                                                 assert!(tx.lock_time == 0);
2675                                         }
2676                                         res.push(tx.clone());
2677                                         break;
2678                                 }
2679                         }
2680                         assert_eq!(res.len(), 2);
2681                 }
2682                 node_txn.clear();
2683                 res
2684         }
2685
2686         fn check_preimage_claim(node: &Node, prev_txn: &Vec<Transaction>) -> Vec<Transaction> {
2687                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
2688
2689                 assert!(node_txn.len() >= 1);
2690                 assert_eq!(node_txn[0].input.len(), 1);
2691                 let mut found_prev = false;
2692
2693                 for tx in prev_txn {
2694                         if node_txn[0].input[0].prev_hash == tx.txid() {
2695                                 let mut funding_tx_map = HashMap::new();
2696                                 funding_tx_map.insert(tx.txid(), tx.clone());
2697                                 node_txn[0].verify(&funding_tx_map).unwrap();
2698
2699                                 assert!(node_txn[0].input[0].witness[2].len() > 106); // must spend an htlc output
2700                                 assert_eq!(tx.input.len(), 1); // must spend a commitment tx
2701
2702                                 found_prev = true;
2703                                 break;
2704                         }
2705                 }
2706                 assert!(found_prev);
2707
2708                 let mut res = Vec::new();
2709                 mem::swap(&mut *node_txn, &mut res);
2710                 res
2711         }
2712
2713         fn get_announce_close_broadcast_events(nodes: &Vec<Node>, a: usize, b: usize) {
2714                 let events_1 = nodes[a].node.get_and_clear_pending_events();
2715                 assert_eq!(events_1.len(), 1);
2716                 let as_update = match events_1[0] {
2717                         Event::BroadcastChannelUpdate { ref msg } => {
2718                                 msg.clone()
2719                         },
2720                         _ => panic!("Unexpected event"),
2721                 };
2722
2723                 let events_2 = nodes[b].node.get_and_clear_pending_events();
2724                 assert_eq!(events_2.len(), 1);
2725                 let bs_update = match events_2[0] {
2726                         Event::BroadcastChannelUpdate { ref msg } => {
2727                                 msg.clone()
2728                         },
2729                         _ => panic!("Unexpected event"),
2730                 };
2731
2732                 for node in nodes {
2733                         node.router.handle_channel_update(&as_update).unwrap();
2734                         node.router.handle_channel_update(&bs_update).unwrap();
2735                 }
2736         }
2737
2738         #[test]
2739         fn channel_monitor_network_test() {
2740                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
2741                 // tests that ChannelMonitor is able to recover from various states.
2742                 let nodes = create_network(5);
2743
2744                 // Create some initial channels
2745                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
2746                 let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2);
2747                 let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3);
2748                 let chan_4 = create_announced_chan_between_nodes(&nodes, 3, 4);
2749
2750                 // Rebalance the network a bit by relaying one payment through all the channels...
2751                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2752                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2753                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2754                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2755
2756                 // Simple case with no pending HTLCs:
2757                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), true);
2758                 {
2759                         let node_txn = test_txn_broadcast(&nodes[1], &chan_1, None, HTLCType::NONE);
2760                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2761                         nodes[0].chain_monitor.block_connected_checked(&header, 1, &[&node_txn[0]; 1], &[4; 1]);
2762                         assert_eq!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().len(), 0);
2763                 }
2764                 get_announce_close_broadcast_events(&nodes, 0, 1);
2765                 assert_eq!(nodes[0].node.list_channels().len(), 0);
2766                 assert_eq!(nodes[1].node.list_channels().len(), 1);
2767
2768                 // One pending HTLC is discarded by the force-close:
2769                 let payment_preimage_1 = route_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 3000000).0;
2770
2771                 // Simple case of one pending HTLC to HTLC-Timeout
2772                 nodes[1].node.peer_disconnected(&nodes[2].node.get_our_node_id(), true);
2773                 {
2774                         let node_txn = test_txn_broadcast(&nodes[1], &chan_2, None, HTLCType::TIMEOUT);
2775                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2776                         nodes[2].chain_monitor.block_connected_checked(&header, 1, &[&node_txn[0]; 1], &[4; 1]);
2777                         assert_eq!(nodes[2].tx_broadcaster.txn_broadcasted.lock().unwrap().len(), 0);
2778                 }
2779                 get_announce_close_broadcast_events(&nodes, 1, 2);
2780                 assert_eq!(nodes[1].node.list_channels().len(), 0);
2781                 assert_eq!(nodes[2].node.list_channels().len(), 1);
2782
2783                 macro_rules! claim_funds {
2784                         ($node: expr, $prev_node: expr, $preimage: expr) => {
2785                                 {
2786                                         assert!($node.node.claim_funds($preimage));
2787                                         {
2788                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2789                                                 assert_eq!(added_monitors.len(), 1);
2790                                                 added_monitors.clear();
2791                                         }
2792
2793                                         let events = $node.node.get_and_clear_pending_events();
2794                                         assert_eq!(events.len(), 1);
2795                                         match events[0] {
2796                                                 Event::SendFulfillHTLC { ref node_id, .. } => {
2797                                                         assert_eq!(*node_id, $prev_node.node.get_our_node_id());
2798                                                 },
2799                                                 _ => panic!("Unexpected event"),
2800                                         };
2801                                 }
2802                         }
2803                 }
2804
2805                 // nodes[3] gets the preimage, but nodes[2] already disconnected, resulting in a nodes[2]
2806                 // HTLC-Timeout and a nodes[3] claim against it (+ its own announces)
2807                 nodes[2].node.peer_disconnected(&nodes[3].node.get_our_node_id(), true);
2808                 {
2809                         let node_txn = test_txn_broadcast(&nodes[2], &chan_3, None, HTLCType::TIMEOUT);
2810
2811                         // Claim the payment on nodes[3], giving it knowledge of the preimage
2812                         claim_funds!(nodes[3], nodes[2], payment_preimage_1);
2813
2814                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2815                         nodes[3].chain_monitor.block_connected_checked(&header, 1, &[&node_txn[0]; 1], &[4; 1]);
2816
2817                         check_preimage_claim(&nodes[3], &node_txn);
2818                 }
2819                 get_announce_close_broadcast_events(&nodes, 2, 3);
2820                 assert_eq!(nodes[2].node.list_channels().len(), 0);
2821                 assert_eq!(nodes[3].node.list_channels().len(), 1);
2822
2823                 // One pending HTLC to time out:
2824                 let payment_preimage_2 = route_payment(&nodes[3], &vec!(&nodes[4])[..], 3000000).0;
2825
2826                 {
2827                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2828                         nodes[3].chain_monitor.block_connected_checked(&header, 1, &Vec::new()[..], &[0; 0]);
2829                         for i in 2..TEST_FINAL_CLTV - 5 {
2830                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2831                                 nodes[3].chain_monitor.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
2832                         }
2833
2834                         let node_txn = test_txn_broadcast(&nodes[3], &chan_4, None, HTLCType::TIMEOUT);
2835
2836                         // Claim the payment on nodes[3], giving it knowledge of the preimage
2837                         claim_funds!(nodes[4], nodes[3], payment_preimage_2);
2838
2839                         header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2840                         nodes[4].chain_monitor.block_connected_checked(&header, 1, &Vec::new()[..], &[0; 0]);
2841                         for i in 2..TEST_FINAL_CLTV - 5 {
2842                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2843                                 nodes[4].chain_monitor.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
2844                         }
2845
2846                         test_txn_broadcast(&nodes[4], &chan_4, None, HTLCType::SUCCESS);
2847
2848                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2849                         nodes[4].chain_monitor.block_connected_checked(&header, TEST_FINAL_CLTV - 5, &[&node_txn[0]; 1], &[4; 1]);
2850
2851                         check_preimage_claim(&nodes[4], &node_txn);
2852                 }
2853                 get_announce_close_broadcast_events(&nodes, 3, 4);
2854                 assert_eq!(nodes[3].node.list_channels().len(), 0);
2855                 assert_eq!(nodes[4].node.list_channels().len(), 0);
2856
2857                 // Create some new channels:
2858                 let chan_5 = create_announced_chan_between_nodes(&nodes, 0, 1);
2859
2860                 // A pending HTLC which will be revoked:
2861                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
2862                 // Get the will-be-revoked local txn from nodes[0]
2863                 let revoked_local_txn = nodes[0].node.channel_state.lock().unwrap().by_id.iter().next().unwrap().1.last_local_commitment_txn.clone();
2864                 // Revoke the old state
2865                 claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage_3);
2866
2867                 {
2868                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2869                         nodes[1].chain_monitor.block_connected_checked(&header, 1, &vec![&revoked_local_txn[0]; 1], &[4; 1]);
2870                         {
2871                                 let mut node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
2872                                 assert_eq!(node_txn.len(), 1);
2873                                 assert_eq!(node_txn[0].input.len(), 1);
2874
2875                                 let mut funding_tx_map = HashMap::new();
2876                                 funding_tx_map.insert(revoked_local_txn[0].txid(), revoked_local_txn[0].clone());
2877                                 node_txn[0].verify(&funding_tx_map).unwrap();
2878                                 node_txn.clear();
2879                         }
2880
2881                         nodes[0].chain_monitor.block_connected_checked(&header, 1, &vec![&revoked_local_txn[0]; 1], &[4; 0]);
2882                         let node_txn = test_txn_broadcast(&nodes[0], &chan_5, Some(revoked_local_txn[0].clone()), HTLCType::TIMEOUT);
2883                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2884                         nodes[1].chain_monitor.block_connected_checked(&header, 1, &[&node_txn[1]; 1], &[4; 1]);
2885
2886                         //TODO: At this point nodes[1] should claim the revoked HTLC-Timeout output, but that's
2887                         //not yet implemented in ChannelMonitor
2888                 }
2889                 get_announce_close_broadcast_events(&nodes, 0, 1);
2890                 assert_eq!(nodes[0].node.list_channels().len(), 0);
2891                 assert_eq!(nodes[1].node.list_channels().len(), 0);
2892
2893                 // Check that we processed all pending events
2894                 for node in nodes {
2895                         assert_eq!(node.node.get_and_clear_pending_events().len(), 0);
2896                         assert_eq!(node.chan_monitor.added_monitors.lock().unwrap().len(), 0);
2897                 }
2898         }
2899 }