_ 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::{ChainListener,ChainWatchInterface,FeeEstimator};
  15 use ln::channel::Channel;
  16 use ln::channelmonitor::ManyChannelMonitor;
  17 use ln::router::Route;
  18 use ln::msgs;
  19 use ln::msgs::{HandleError,ChannelMessageHandler,MsgEncodable,MsgDecodable};
  20 use util::byte_utils;
  21 use util::events;
  22 use util::internal_traits;
  23
  24 use rand::{thread_rng,Rng};
  25
  26 use crypto::mac::{Mac,MacResult};
  27 use crypto::hmac::Hmac;
  28 use crypto::digest::Digest;
  29 use crypto::sha2::Sha256;
  30 use crypto::symmetriccipher::SynchronousStreamCipher;
  31 use crypto::chacha20::ChaCha20;
  32
  33 use std::sync::{Mutex,Arc};
  34 use std::collections::HashMap;
  35 use std::collections::hash_map;
  36 use std::ptr;
  37 use std::mem;
  38 use std::time::{Instant,Duration};
  39
  40 /// Stores the info we will need to send when we want to forward an HTLC onwards
  41 pub struct PendingForwardHTLCInfo {
  42         onion_packet: Option<msgs::OnionPacket>,
  43         payment_hash: [u8; 32],
  44         short_channel_id: u64,
  45         prev_short_channel_id: u64,
  46         amt_to_forward: u64,
  47         outgoing_cltv_value: u32,
  48 }
  49
  50 struct ChannelHolder {
  51         by_id: HashMap<Uint256, Channel>,
  52         short_to_id: HashMap<u64, Uint256>,
  53 }
  54
  55 /// We hold back HTLCs we intend to relay for a random interval in the range (this, 5*this). This
  56 /// provides some limited amount of privacy. Ideally this would range from somewhere like 1 second
  57 /// to 30 seconds, but people expect lightning to be, you know, kinda fast, sadly. We could
  58 /// probably increase this significantly.
  59 const MIN_HTLC_RELAY_HOLDING_CELL_MILLIS: u32 = 50;
  60
  61 struct PendingForwardableHTLCs {
  62         next_forward: Instant,
  63         /// short channel id -> forward infos. Key of 0 means payments received
  64         forward_htlcs: HashMap<u64, Vec<PendingForwardHTLCInfo>>,
  65 }
  66
  67 /// Manager which keeps track of a number of channels and sends messages to the appropriate
  68 /// channel, also tracking HTLC preimages and forwarding onion packets appropriately.
  69 /// Implements ChannelMessageHandler, handling the multi-channel parts and passing things through
  70 /// to individual Channels.
  71 pub struct ChannelManager {
  72         genesis_hash: Sha256dHash,
  73         fee_estimator: Arc<FeeEstimator>,
  74         monitor: Arc<ManyChannelMonitor>,
  75         chain_monitor: Arc<ChainWatchInterface>,
  76
  77         announce_channels_publicly: bool,
  78         fee_proportional_millionths: u32,
  79         secp_ctx: Secp256k1,
  80
  81         channels: Mutex<ChannelHolder>,
  82         our_network_key: SecretKey,
  83
  84         pending_events: Mutex<Vec<events::Event>>,
  85         pending_htlcs_forwardable: Mutex<PendingForwardableHTLCs>,
  86         pending_claimable_htlcs: Mutex<HashMap<[u8; 32], u64>>,
  87 }
  88
  89 const CLTV_EXPIRY_DELTA: u16 = 6 * 24 * 2; //TODO?
  90
  91 macro_rules! secp_call {
  92         ( $res : expr ) => {
  93                 match $res {
  94                         Ok(key) => key,
  95                         //TODO: Make the err a parameter!
  96                         Err(_) => return Err(HandleError{err: "Key error", msg: None})
  97                 }
  98         };
  99 }
 100
 101 struct OnionKeys {
 102         #[cfg(test)]
 103         shared_secret: SharedSecret,
 104         #[cfg(test)]
 105         blinding_factor: [u8; 32],
 106         ephemeral_pubkey: PublicKey,
 107         rho: [u8; 32],
 108         mu: [u8; 32],
 109 }
 110
 111 impl ChannelManager {
 112         /// Constructs a new ChannelManager to hold several channels and route between them. This is
 113         /// the main "logic hub" for all channel-related actions, and implements ChannelMessageHandler.
 114         /// fee_proportional_millionths is an optional fee to charge any payments routed through us.
 115         /// Non-proportional fees are fixed according to our risk using the provided fee estimator.
 116         /// panics if channel_value_satoshis is >= (1 << 24)!
 117         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>) -> Result<Arc<ChannelManager>, secp256k1::Error> {
 118                 let secp_ctx = Secp256k1::new();
 119
 120                 let res = Arc::new(ChannelManager {
 121                         genesis_hash: genesis_block(network).header.bitcoin_hash(),
 122                         fee_estimator: feeest.clone(),
 123                         monitor: monitor.clone(),
 124                         chain_monitor: chain_monitor,
 125
 126                         announce_channels_publicly: announce_channels_publicly,
 127                         fee_proportional_millionths: fee_proportional_millionths,
 128                         secp_ctx: secp_ctx,
 129
 130                         channels: Mutex::new(ChannelHolder{by_id: HashMap::new(), short_to_id: HashMap::new()}),
 131                         our_network_key: our_network_key,
 132
 133                         pending_events: Mutex::new(Vec::new()),
 134                         pending_htlcs_forwardable: Mutex::new(PendingForwardableHTLCs {
 135                                 next_forward: Instant::now(),
 136                                 forward_htlcs: HashMap::new(),
 137                         }),
 138                         pending_claimable_htlcs: Mutex::new(HashMap::new()),
 139                 });
 140                 let weak_res = Arc::downgrade(&res);
 141                 res.chain_monitor.register_listener(weak_res);
 142                 Ok(res)
 143         }
 144
 145         pub fn create_channel(&self, their_network_key: PublicKey, channel_value_satoshis: u64, user_id: u64) -> Result<msgs::OpenChannel, HandleError> {
 146                 let channel = Channel::new_outbound(&*self.fee_estimator, their_network_key, channel_value_satoshis, self.announce_channels_publicly, user_id);
 147                 let res = channel.get_open_channel(self.genesis_hash.clone(), &*self.fee_estimator)?;
 148                 let mut channels = self.channels.lock().unwrap();
 149                 match channels.by_id.insert(channel.channel_id(), channel) {
 150                         Some(_) => panic!("RNG is bad???"),
 151                         None => Ok(res)
 152                 }
 153         }
 154
 155         #[inline]
 156         fn gen_rho_mu_from_shared_secret(shared_secret: &SharedSecret) -> ([u8; 32], [u8; 32]) {
 157                 ({
 158                         let mut hmac = Hmac::new(Sha256::new(), &[0x72, 0x68, 0x6f]); // rho
 159                         hmac.input(&shared_secret[..]);
 160                         let mut res = [0; 32];
 161                         hmac.raw_result(&mut res);
 162                         res
 163                 },
 164                 {
 165                         let mut hmac = Hmac::new(Sha256::new(), &[0x6d, 0x75]); // mu
 166                         hmac.input(&shared_secret[..]);
 167                         let mut res = [0; 32];
 168                         hmac.raw_result(&mut res);
 169                         res
 170                 })
 171         }
 172
 173         #[inline]
 174         fn gen_um_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 175                 let mut hmac = Hmac::new(Sha256::new(), &[0x75, 0x6d]); // um
 176                 hmac.input(&shared_secret[..]);
 177                 let mut res = [0; 32];
 178                 hmac.raw_result(&mut res);
 179                 res
 180         }
 181
 182         fn gen_ammag_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 183                 let mut hmac = Hmac::new(Sha256::new(), &[0x61, 0x6d, 0x6d, 0x61, 0x67]); // ammag
 184                 hmac.input(&shared_secret[..]);
 185                 let mut res = [0; 32];
 186                 hmac.raw_result(&mut res);
 187                 res
 188         }
 189
 190         fn construct_onion_keys(secp_ctx: &Secp256k1, route: &Route, session_priv: &SecretKey) -> Result<Vec<OnionKeys>, HandleError> {
 191                 let mut res = Vec::with_capacity(route.hops.len());
 192                 let mut blinded_priv = session_priv.clone();
 193                 let mut blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 194                 let mut first_iteration = true;
 195
 196                 for hop in route.hops.iter() {
 197                         let shared_secret = SharedSecret::new(secp_ctx, &hop.pubkey, &blinded_priv);
 198
 199                         let mut sha = Sha256::new();
 200                         sha.input(&blinded_pub.serialize()[..]);
 201                         sha.input(&shared_secret[..]);
 202                         let mut blinding_factor = [0u8; 32];
 203                         sha.result(&mut blinding_factor);
 204
 205                         if first_iteration {
 206                                 blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 207                                 first_iteration = false;
 208                         }
 209                         let ephemeral_pubkey = blinded_pub;
 210
 211                         secp_call!(blinded_priv.mul_assign(secp_ctx, &secp_call!(SecretKey::from_slice(secp_ctx, &blinding_factor))));
 212                         blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 213
 214                         let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
 215
 216                         res.push(OnionKeys {
 217                                 #[cfg(test)]
 218                                 shared_secret: shared_secret,
 219                                 #[cfg(test)]
 220                                 blinding_factor: blinding_factor,
 221                                 ephemeral_pubkey: ephemeral_pubkey,
 222                                 rho: rho,
 223                                 mu: mu,
 224                         });
 225                 }
 226
 227                 Ok(res)
 228         }
 229
 230         /// returns the hop data, as well as the first-hop value_msat and CLTV value we should send.
 231         fn build_onion_payloads(route: &Route) -> Result<(Vec<msgs::OnionHopData>, u64, u32), HandleError> {
 232                 let mut cur_value_msat = 0u64;
 233                 let mut cur_cltv = 0u32;
 234                 let mut last_short_channel_id = 0;
 235                 let mut res: Vec<msgs::OnionHopData> = Vec::with_capacity(route.hops.len());
 236                 internal_traits::test_no_dealloc::<msgs::OnionHopData>(None);
 237                 unsafe { res.set_len(route.hops.len()); }
 238
 239                 for (idx, hop) in route.hops.iter().enumerate().rev() {
 240                         // First hop gets special values so that it can check, on receipt, that everything is
 241                         // exactly as it should be (and the next hop isn't trying to probe to find out if we're
 242                         // the intended recipient).
 243                         let value_msat = if cur_value_msat == 0 { hop.fee_msat } else { cur_value_msat };
 244                         let cltv = if cur_cltv == 0 { hop.cltv_expiry_delta } else { cur_cltv };
 245                         res[idx] = msgs::OnionHopData {
 246                                 realm: 0,
 247                                 data: msgs::OnionRealm0HopData {
 248                                         short_channel_id: last_short_channel_id,
 249                                         amt_to_forward: value_msat,
 250                                         outgoing_cltv_value: cltv,
 251                                 },
 252                                 hmac: [0; 32],
 253                         };
 254                         cur_value_msat += hop.fee_msat;
 255                         if cur_value_msat >= 21000000 * 100000000 * 1000 {
 256                                 return Err(HandleError{err: "Channel fees overflowed?!", msg: None});
 257                         }
 258                         cur_cltv += hop.cltv_expiry_delta as u32;
 259                         if cur_cltv >= 500000000 {
 260                                 return Err(HandleError{err: "Channel CLTV overflowed?!", msg: None});
 261                         }
 262                         last_short_channel_id = hop.short_channel_id;
 263                 }
 264                 Ok((res, cur_value_msat, cur_cltv))
 265         }
 266
 267         #[inline]
 268         fn shift_arr_right(arr: &mut [u8; 20*65]) {
 269                 unsafe {
 270                         ptr::copy(arr[0..].as_ptr(), arr[65..].as_mut_ptr(), 19*65);
 271                 }
 272                 for i in 0..65 {
 273                         arr[i] = 0;
 274                 }
 275         }
 276
 277         #[inline]
 278         fn xor_bufs(dst: &mut[u8], src: &[u8]) {
 279                 assert_eq!(dst.len(), src.len());
 280
 281                 for i in 0..dst.len() {
 282                         dst[i] ^= src[i];
 283                 }
 284         }
 285
 286         const ZERO:[u8; 21*65] = [0; 21*65];
 287         fn construct_onion_packet(mut payloads: Vec<msgs::OnionHopData>, onion_keys: Vec<OnionKeys>, associated_data: Vec<u8>) -> Result<msgs::OnionPacket, HandleError> {
 288                 let mut buf = Vec::with_capacity(21*65);
 289                 buf.resize(21*65, 0);
 290
 291                 let filler = {
 292                         let iters = payloads.len() - 1;
 293                         let end_len = iters * 65;
 294                         let mut res = Vec::with_capacity(end_len);
 295                         res.resize(end_len, 0);
 296
 297                         for (i, keys) in onion_keys.iter().enumerate() {
 298                                 if i == payloads.len() - 1 { continue; }
 299                                 let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 300                                 chacha.process(&ChannelManager::ZERO, &mut buf); // We don't have a seek function :(
 301                                 ChannelManager::xor_bufs(&mut res[0..(i + 1)*65], &buf[(20 - i)*65..21*65]);
 302                         }
 303                         res
 304                 };
 305
 306                 let mut packet_data = [0; 20*65];
 307                 let mut hmac_res = [0; 32];
 308
 309                 for (i, (payload, keys)) in payloads.iter_mut().zip(onion_keys.iter()).rev().enumerate() {
 310                         ChannelManager::shift_arr_right(&mut packet_data);
 311                         payload.hmac = hmac_res;
 312                         packet_data[0..65].copy_from_slice(&payload.encode()[..]);
 313
 314                         let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 315                         chacha.process(&packet_data, &mut buf[0..20*65]);
 316                         packet_data[..].copy_from_slice(&buf[0..20*65]);
 317
 318                         if i == 0 {
 319                                 packet_data[20*65 - filler.len()..20*65].copy_from_slice(&filler[..]);
 320                         }
 321
 322                         let mut hmac = Hmac::new(Sha256::new(), &keys.mu);
 323                         hmac.input(&packet_data);
 324                         hmac.input(&associated_data[..]);
 325                         hmac.raw_result(&mut hmac_res);
 326                 }
 327
 328                 Ok(msgs::OnionPacket{
 329                         version: 0,
 330                         public_key: onion_keys.first().unwrap().ephemeral_pubkey,
 331                         hop_data: packet_data,
 332                         hmac: hmac_res,
 333                 })
 334         }
 335
 336         /// Encrypts a failure packet. raw_packet can either be a
 337         /// msgs::DecodedOnionErrorPacket.encode() result or a msgs::OnionErrorPacket.data element.
 338         fn encrypt_failure_packet(shared_secret: &SharedSecret, raw_packet: &[u8]) -> msgs::OnionErrorPacket {
 339                 let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
 340
 341                 let mut packet_crypted = Vec::with_capacity(raw_packet.len());
 342                 packet_crypted.resize(raw_packet.len(), 0);
 343                 let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
 344                 chacha.process(&raw_packet, &mut packet_crypted[..]);
 345                 msgs::OnionErrorPacket {
 346                         data: packet_crypted,
 347                 }
 348         }
 349
 350         fn build_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::DecodedOnionErrorPacket {
 351                 assert!(failure_data.len() <= 256 - 2);
 352
 353                 let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
 354
 355                 let failuremsg = {
 356                         let mut res = Vec::with_capacity(2 + failure_data.len());
 357                         res.push(((failure_type >> 8) & 0xff) as u8);
 358                         res.push(((failure_type >> 0) & 0xff) as u8);
 359                         res.extend_from_slice(&failure_data[..]);
 360                         res
 361                 };
 362                 let pad = {
 363                         let mut res = Vec::with_capacity(256 - 2 - failure_data.len());
 364                         res.resize(256 - 2 - failure_data.len(), 0);
 365                         res
 366                 };
 367                 let mut packet = msgs::DecodedOnionErrorPacket {
 368                         hmac: [0; 32],
 369                         failuremsg: failuremsg,
 370                         pad: pad,
 371                 };
 372
 373                 let mut hmac = Hmac::new(Sha256::new(), &um);
 374                 hmac.input(&packet.encode()[32..]);
 375                 hmac.raw_result(&mut packet.hmac);
 376
 377                 packet
 378         }
 379
 380         fn build_first_hop_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::OnionErrorPacket {
 381                 let failure_packet = ChannelManager::build_failure_packet(shared_secret, failure_type, failure_data);
 382                 ChannelManager::encrypt_failure_packet(shared_secret, &failure_packet.encode()[..])
 383         }
 384
 385         /// only fails if the channel does not yet have an assigned short_id
 386         fn get_channel_update(&self, chan: &mut Channel) -> Result<msgs::ChannelUpdate, HandleError> {
 387                 let short_channel_id = match chan.get_short_channel_id() {
 388                         None => return Err(HandleError{err: "Channel not yet established", msg: None}),
 389                         Some(id) => id,
 390                 };
 391
 392                 let were_node_one = PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).unwrap().serialize()[..] < chan.get_their_node_id().serialize()[..];
 393
 394                 let unsigned = msgs::UnsignedChannelUpdate {
 395                         chain_hash: self.genesis_hash,
 396                         short_channel_id: short_channel_id,
 397                         timestamp: chan.get_channel_update_count(),
 398                         flags: (!were_node_one) as u16 | ((!chan.is_live() as u16) << 1),
 399                         cltv_expiry_delta: CLTV_EXPIRY_DELTA,
 400                         htlc_minimum_msat: chan.get_our_htlc_minimum_msat(),
 401                         fee_base_msat: chan.get_our_fee_base_msat(&*self.fee_estimator),
 402                         fee_proportional_millionths: self.fee_proportional_millionths,
 403                 };
 404
 405                 let msg_hash = Sha256dHash::from_data(&unsigned.encode()[..]);
 406                 let sig = self.secp_ctx.sign(&Message::from_slice(&msg_hash[..]).unwrap(), &self.our_network_key).unwrap(); //TODO Can we unwrap here?
 407
 408                 Ok(msgs::ChannelUpdate {
 409                         signature: sig,
 410                         contents: unsigned
 411                 })
 412         }
 413
 414         /// Sends a payment along a given route, returning the UpdateAddHTLC message to give to the
 415         /// first hop in route. Value parameters are provided via the last hop in route, see
 416         /// documentation for RouteHop fields for more info.
 417         /// See-also docs on Channel::send_htlc_and_commit.
 418         pub fn send_payment(&self, route: &Route, payment_hash: [u8; 32]) -> Result<Option<(msgs::UpdateAddHTLC, msgs::CommitmentSigned)>, HandleError> {
 419                 if route.hops.len() < 1 || route.hops.len() > 20 {
 420                         return Err(HandleError{err: "Route didn't go anywhere/had bogus size", msg: None});
 421                 }
 422
 423                 let mut rng = thread_rng();
 424                 let session_priv = secp_call!(SecretKey::from_slice(&self.secp_ctx, & {
 425                         let mut session_key = [0; 32];
 426                         rng.fill_bytes(&mut session_key);
 427                         session_key
 428                 }));
 429
 430                 let associated_data = Vec::new(); //TODO: What to put here?
 431
 432                 let onion_keys = ChannelManager::construct_onion_keys(&self.secp_ctx, route, &session_priv)?;
 433                 let (onion_payloads, htlc_msat, htlc_cltv) = ChannelManager::build_onion_payloads(route)?;
 434                 let onion_packet = ChannelManager::construct_onion_packet(onion_payloads, onion_keys, associated_data)?;
 435
 436                 let mut channels = self.channels.lock().unwrap();
 437                 let id = match channels.short_to_id.get(&route.hops.first().unwrap().short_channel_id) {
 438                         None => return Err(HandleError{err: "No channel available with first hop!", msg: None}),
 439                         Some(id) => id.clone()
 440                 };
 441                 let chan = channels.by_id.get_mut(&id).unwrap();
 442                 if chan.get_their_node_id() != route.hops.first().unwrap().pubkey {
 443                         return Err(HandleError{err: "Node ID mismatch on first hop!", msg: None});
 444                 }
 445                 chan.send_htlc_and_commit(htlc_msat, payment_hash, htlc_cltv, onion_packet)
 446         }
 447
 448         /// Call this upon creation of a funding transaction for the given channel.
 449         /// Panics if a funding transaction has already been provided for this channel.
 450         pub fn funding_transaction_generated(&self, temporary_channel_id: &Uint256, funding_txo: (Sha256dHash, u16)) {
 451                 let (chan, msg) = {
 452                         let mut channels = self.channels.lock().unwrap();
 453                         match channels.by_id.remove(&temporary_channel_id) {
 454                                 Some(mut chan) => {
 455                                         match chan.get_outbound_funding_created(funding_txo.0, funding_txo.1) {
 456                                                 Ok(funding_msg) => {
 457                                                         (chan, funding_msg)
 458                                                 },
 459                                                 Err(_e) => {
 460                                                         //TODO: Push e to pendingevents
 461                                                         return;
 462                                                 }
 463                                         }
 464                                 },
 465                                 None => return
 466                         }
 467                 }; // Release channel lock for install_watch_outpoint call,
 468                 let chan_monitor = chan.channel_monitor();
 469                 match self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 470                         Ok(()) => {},
 471                         Err(_e) => {
 472                                 //TODO: Push e to pendingevents?
 473                                 return;
 474                         }
 475                 };
 476
 477                 {
 478                         let mut pending_events = self.pending_events.lock().unwrap();
 479                         pending_events.push(events::Event::SendFundingCreated {
 480                                 node_id: chan.get_their_node_id(),
 481                                 msg: msg,
 482                         });
 483                 }
 484
 485                 let mut channels = self.channels.lock().unwrap();
 486                 channels.by_id.insert(chan.channel_id(), chan);
 487         }
 488
 489         fn get_announcement_sigs(&self, chan: &Channel) -> Result<Option<msgs::AnnouncementSignatures>, HandleError> {
 490                 if !chan.is_usable() { return Ok(None) }
 491
 492                 let (announcement, our_bitcoin_sig) = chan.get_channel_announcement(self.get_our_node_id(), self.genesis_hash.clone())?;
 493                 let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
 494                 let our_node_sig = secp_call!(self.secp_ctx.sign(&msghash, &self.our_network_key));
 495
 496                 Ok(Some(msgs::AnnouncementSignatures {
 497                         channel_id: chan.channel_id(),
 498                         short_channel_id: chan.get_short_channel_id().unwrap(),
 499                         node_signature: our_node_sig,
 500                         bitcoin_signature: our_bitcoin_sig,
 501                 }))
 502         }
 503
 504         pub fn process_pending_htlc_forward(&self) {
 505                 let forward_htlcs = {
 506                         let mut pending_forwards = self.pending_htlcs_forwardable.lock().unwrap();
 507                         if Instant::now() < pending_forwards.next_forward {
 508                                 return;
 509                         }
 510                         let mut new_map = HashMap::new();
 511                         mem::swap(&mut new_map, &mut pending_forwards.forward_htlcs);
 512                         new_map
 513                 };
 514
 515                 let mut new_events = Vec::new();
 516
 517                 {
 518                         for (short_chan_id, pending_forwards) in forward_htlcs.iter() {
 519                                 let mut pending_claimable_htlcs = self.pending_claimable_htlcs.lock().unwrap();
 520                                 for forward_info in pending_forwards {
 521                                         pending_claimable_htlcs.insert(forward_info.payment_hash, forward_info.prev_short_channel_id);
 522                                         if *short_chan_id == 0 {
 523                                                 new_events.push(events::Event::PaymentReceived {
 524                                                         payment_hash: forward_info.payment_hash,
 525                                                         amt: forward_info.amt_to_forward,
 526                                                 });
 527                                         }
 528                                 }
 529                         }
 530                 }
 531                 {
 532                         let mut channels = self.channels.lock().unwrap();
 533                         for (short_chan_id, pending_forwards) in forward_htlcs {
 534                                 if short_chan_id != 0 {
 535                                         let forward_chan_id = match channels.short_to_id.get(&short_chan_id) {
 536                                                 Some(chan_id) => chan_id.clone(),
 537                                                 None => {
 538                                                         // TODO: Send a failure packet back on each pending_forward
 539                                                         continue;
 540                                                 }
 541                                         };
 542                                         let forward_chan = &mut channels.by_id.get_mut(&forward_chan_id).unwrap();
 543
 544                                         let mut add_htlc_msgs = Vec::new();
 545                                         for forward_info in pending_forwards {
 546                                                 match forward_chan.send_htlc(forward_info.amt_to_forward, forward_info.payment_hash, forward_info.outgoing_cltv_value, forward_info.onion_packet.unwrap()) {
 547                                                         Err(_e) => {
 548                                                                 // TODO: Send a failure packet back
 549                                                                 continue;
 550                                                         },
 551                                                         Ok(update_add) => {
 552                                                                 match update_add {
 553                                                                         Some(msg) => { add_htlc_msgs.push(msg); },
 554                                                                         None => {
 555                                                                                 // Nothing to do here...we're waiting on a remote
 556                                                                                 // revoke_and_ack before we can add anymore HTLCs. The Channel
 557                                                                                 // will automatically handle building the update_add_htlc and
 558                                                                                 // commitment_signed messages when we can.
 559                                                                                 // TODO: Do some kind of timer to set the channel as !is_live()
 560                                                                                 // as we don't really want others relying on us relaying through
 561                                                                                 // this channel currently :/.
 562                                                                         }
 563                                                                 }
 564                                                         }
 565                                                 }
 566                                         }
 567
 568                                         if !add_htlc_msgs.is_empty() {
 569                                                 let commitment_msg = match forward_chan.send_commitment() {
 570                                                         Ok(msg) => msg,
 571                                                         Err(_) => {
 572                                                                 //TODO: Handle...this is bad!
 573                                                                 continue;
 574                                                         },
 575                                                 };
 576                                                 new_events.push(events::Event::SendHTLCs {
 577                                                         node_id: forward_chan.get_their_node_id(),
 578                                                         msgs: add_htlc_msgs,
 579                                                         commitment_msg: commitment_msg,
 580                                                 });
 581                                         }
 582                                 }
 583                         }
 584                 }
 585
 586                 if new_events.is_empty() { return }
 587
 588                 let mut events = self.pending_events.lock().unwrap();
 589                 events.reserve(new_events.len());
 590                 for event in new_events.drain(..) {
 591                         events.push(event);
 592                 }
 593         }
 594
 595         /// Provides a payment preimage in response to a PaymentReceived event, returning true and
 596         /// generating message events for the net layer to claim the payment, if possible. Thus, you
 597         /// should probably kick the net layer to go send messages if this returns true!
 598         pub fn claim_funds(&self, payment_preimage: [u8; 32]) -> bool {
 599                 let mut sha = Sha256::new();
 600                 sha.input(&payment_preimage);
 601                 let mut payment_hash = [0; 32];
 602                 sha.result(&mut payment_hash);
 603
 604                 let short_chan_id = {
 605                         let mut pending_claimable_htlcs = self.pending_claimable_htlcs.lock().unwrap();
 606                         match pending_claimable_htlcs.remove(&payment_hash) {
 607                                 Some(short_id) => short_id,
 608                                 None => return false,
 609                         }
 610                 };
 611
 612                 let (node_id, fulfill_msg) = {
 613                         let mut channels = self.channels.lock().unwrap();
 614                         let chan_id = match channels.short_to_id.get(&short_chan_id) {
 615                                 Some(chan_id) => chan_id.clone(),
 616                                 None => return false
 617                         };
 618
 619                         let chan = channels.by_id.get_mut(&chan_id).unwrap();
 620                         match chan.get_update_fulfill_htlc(payment_preimage) {
 621                                 Ok(msg) => (chan.get_their_node_id(), msg),
 622                                 Err(_e) => {
 623                                         //TODO: Do something with e?
 624                                         return false;
 625                                 },
 626                         }
 627                 };
 628
 629                 let mut pending_events = self.pending_events.lock().unwrap();
 630                 pending_events.push(events::Event::SendFulfillHTLC {
 631                         node_id: node_id,
 632                         msg: fulfill_msg
 633                 });
 634
 635                 true
 636         }
 637
 638         /// Gets the node_id held by this ChannelManager
 639         pub fn get_our_node_id(&self) -> PublicKey {
 640                 PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).unwrap()
 641         }
 642 }
 643
 644 impl events::EventsProvider for ChannelManager {
 645         fn get_and_clear_pending_events(&self) -> Vec<events::Event> {
 646                 let mut pending_events = self.pending_events.lock().unwrap();
 647                 let mut ret = Vec::new();
 648                 mem::swap(&mut ret, &mut *pending_events);
 649                 ret
 650         }
 651 }
 652
 653 impl ChainListener for ChannelManager {
 654         fn block_connected(&self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) {
 655                 let mut new_funding_locked_messages = Vec::new();
 656                 {
 657                         let mut channels = self.channels.lock().unwrap();
 658                         let mut short_to_ids_to_insert = Vec::new();
 659                         for channel in channels.by_id.values_mut() {
 660                                 match channel.block_connected(header, height, txn_matched, indexes_of_txn_matched) {
 661                                         Some(funding_locked) => {
 662                                                 let announcement_sigs = match self.get_announcement_sigs(channel) {
 663                                                         Ok(res) => res,
 664                                                         Err(_e) => {
 665                                                                 //TODO: push e on events and blow up the channel (it has bad keys)
 666                                                                 continue;
 667                                                         }
 668                                                 };
 669                                                 new_funding_locked_messages.push(events::Event::SendFundingLocked {
 670                                                         node_id: channel.get_their_node_id(),
 671                                                         msg: funding_locked,
 672                                                         announcement_sigs: announcement_sigs
 673                                                 });
 674                                                 short_to_ids_to_insert.push((channel.get_short_channel_id().unwrap(), channel.channel_id()));
 675                                         },
 676                                         None => {}
 677                                 }
 678                         }
 679                         for to_insert in short_to_ids_to_insert {
 680                                 channels.short_to_id.insert(to_insert.0, to_insert.1);
 681                         }
 682                 }
 683                 let mut pending_events = self.pending_events.lock().unwrap();
 684                 for funding_locked in new_funding_locked_messages.drain(..) {
 685                         pending_events.push(funding_locked);
 686                 }
 687         }
 688
 689         fn block_disconnected(&self, header: &BlockHeader) {
 690                 let mut channels = self.channels.lock().unwrap();
 691                 for channel in channels.by_id.values_mut() {
 692                         if channel.block_disconnected(header) {
 693                                 //TODO Close channel here
 694                         }
 695                 }
 696         }
 697 }
 698
 699 impl ChannelMessageHandler for ChannelManager {
 700         //TODO: Handle errors and close channel (or so)
 701         fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &msgs::OpenChannel) -> Result<msgs::AcceptChannel, HandleError> {
 702                 if msg.chain_hash != self.genesis_hash {
 703                         return Err(HandleError{err: "Unknown genesis block hash", msg: None});
 704                 }
 705                 let mut channels = self.channels.lock().unwrap();
 706                 if channels.by_id.contains_key(&msg.temporary_channel_id) {
 707                         return Err(HandleError{err: "temporary_channel_id collision!", msg: None});
 708                 }
 709                 let channel = Channel::new_from_req(&*self.fee_estimator, their_node_id.clone(), msg, 0, self.announce_channels_publicly)?;
 710                 let accept_msg = channel.get_accept_channel()?;
 711                 channels.by_id.insert(channel.channel_id(), channel);
 712                 Ok(accept_msg)
 713         }
 714
 715         fn handle_accept_channel(&self, their_node_id: &PublicKey, msg: &msgs::AcceptChannel) -> Result<(), HandleError> {
 716                 let (value, output_script, user_id) = {
 717                         let mut channels = self.channels.lock().unwrap();
 718                         match channels.by_id.get_mut(&msg.temporary_channel_id) {
 719                                 Some(chan) => {
 720                                         if chan.get_their_node_id() != *their_node_id {
 721                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
 722                                         }
 723                                         chan.accept_channel(&msg)?;
 724                                         (chan.get_value_satoshis(), chan.get_funding_redeemscript().to_v0_p2wsh(), chan.get_user_id())
 725                                 },
 726                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
 727                         }
 728                 };
 729                 let mut pending_events = self.pending_events.lock().unwrap();
 730                 pending_events.push(events::Event::FundingGenerationReady {
 731                         temporary_channel_id: msg.temporary_channel_id,
 732                         channel_value_satoshis: value,
 733                         output_script: output_script,
 734                         user_channel_id: user_id,
 735                 });
 736                 Ok(())
 737         }
 738
 739         fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) -> Result<msgs::FundingSigned, HandleError> {
 740                 //TODO: broke this - a node shouldn't be able to get their channel removed by sending a
 741                 //funding_created a second time, or long after the first, or whatever (note this also
 742                 //leaves the short_to_id map in a busted state.
 743                 let chan = {
 744                         let mut channels = self.channels.lock().unwrap();
 745                         match channels.by_id.remove(&msg.temporary_channel_id) {
 746                                 Some(mut chan) => {
 747                                         if chan.get_their_node_id() != *their_node_id {
 748                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
 749                                         }
 750                                         match chan.funding_created(msg) {
 751                                                 Ok(funding_msg) => {
 752                                                         (chan, funding_msg)
 753                                                 },
 754                                                 Err(e) => {
 755                                                         return Err(e);
 756                                                 }
 757                                         }
 758                                 },
 759                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
 760                         }
 761                 }; // Release channel lock for install_watch_outpoint call,
 762                    // note that this means if the remote end is misbehaving and sends a message for the same
 763                    // channel back-to-back with funding_created, we'll end up thinking they sent a message
 764                    // for a bogus channel.
 765                 let chan_monitor = chan.0.channel_monitor();
 766                 self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor)?;
 767                 let mut channels = self.channels.lock().unwrap();
 768                 channels.by_id.insert(chan.1.channel_id, chan.0);
 769                 Ok(chan.1)
 770         }
 771
 772         fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) -> Result<(), HandleError> {
 773                 let (funding_txo, user_id) = {
 774                         let mut channels = self.channels.lock().unwrap();
 775                         match channels.by_id.get_mut(&msg.channel_id) {
 776                                 Some(chan) => {
 777                                         if chan.get_their_node_id() != *their_node_id {
 778                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
 779                                         }
 780                                         chan.funding_signed(&msg)?;
 781                                         (chan.get_funding_txo().unwrap(), chan.get_user_id())
 782                                 },
 783                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
 784                         }
 785                 };
 786                 let mut pending_events = self.pending_events.lock().unwrap();
 787                 pending_events.push(events::Event::FundingBroadcastSafe {
 788                         funding_txo: funding_txo,
 789                         user_channel_id: user_id,
 790                 });
 791                 Ok(())
 792         }
 793
 794         fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &msgs::FundingLocked) -> Result<Option<msgs::AnnouncementSignatures>, HandleError> {
 795                 let mut channels = self.channels.lock().unwrap();
 796                 match channels.by_id.get_mut(&msg.channel_id) {
 797                         Some(chan) => {
 798                                 if chan.get_their_node_id() != *their_node_id {
 799                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
 800                                 }
 801                                 chan.funding_locked(&msg)?;
 802                                 return Ok(self.get_announcement_sigs(chan)?);
 803                         },
 804                         None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
 805                 };
 806         }
 807
 808         fn handle_shutdown(&self, _their_node_id: &PublicKey, _msg: &msgs::Shutdown) -> Result<(), HandleError> {
 809                 unimplemented!()
 810         }
 811
 812         fn handle_closing_signed(&self, _their_node_id: &PublicKey, _msg: &msgs::ClosingSigned) -> Result<(), HandleError> {
 813                 unimplemented!()
 814         }
 815
 816         fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) -> Result<(), msgs::HandleError> {
 817                 //TODO: BOLT 4 points out a specific attack where a peer may re-send an onion packet and
 818                 //determine the state of the payment based on our response/if we forward anything/the time
 819                 //we take to respond. We should take care to avoid allowing such an attack.
 820                 //
 821                 //TODO: There exists a further attack where a node may garble the onion data, forward it to
 822                 //us repeatedly garbled in different ways, and compare our error messages, which are
 823                 //encrypted with the same key. Its not immediately obvious how to usefully exploit that,
 824                 //but we should prevent it anyway.
 825
 826                 let shared_secret = SharedSecret::new(&self.secp_ctx, &msg.onion_routing_packet.public_key, &self.our_network_key);
 827                 let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
 828
 829                 let associated_data = Vec::new(); //TODO: What to put here?
 830
 831                 if msg.onion_routing_packet.version != 0 {
 832                         //TODO: Spec doesn't indicate if we should only hash hop_data here (and in other
 833                         //sha256_of_onion error data packets), or the entire onion_routing_packet. Either way,
 834                         //the hash doesn't really serve any purpuse - in the case of hashing all data, the
 835                         //receiving node would have to brute force to figure out which version was put in the
 836                         //packet by the node that send us the message, in the case of hashing the hop_data, the
 837                         //node knows the HMAC matched, so they already know what is there...
 838                         let mut sha = Sha256::new();
 839                         sha.input(&msg.onion_routing_packet.hop_data);
 840                         let mut onion_hash = [0; 32];
 841                         sha.result(&mut onion_hash);
 842                         return Err(msgs::HandleError {
 843                                 err: "Unknown onion packet version",
 844                                 msg: Some(msgs::ErrorMessage::UpdateFailHTLC {
 845                                         msg: msgs::UpdateFailHTLC {
 846                                                 channel_id: msg.channel_id,
 847                                                 htlc_id: msg.htlc_id,
 848                                                 reason: ChannelManager::build_first_hop_failure_packet(&shared_secret, 0x8000 | 0x4000 | 4, &onion_hash),
 849                                         }
 850                                 }),
 851                         });
 852                 }
 853
 854                 let mut hmac = Hmac::new(Sha256::new(), &mu);
 855                 hmac.input(&msg.onion_routing_packet.hop_data);
 856                 hmac.input(&associated_data[..]);
 857                 if hmac.result() != MacResult::new(&msg.onion_routing_packet.hmac) {
 858                         let mut sha = Sha256::new();
 859                         sha.input(&msg.onion_routing_packet.hop_data);
 860                         let mut onion_hash = [0; 32];
 861                         sha.result(&mut onion_hash);
 862                         return Err(HandleError{err: "HMAC Check failed",
 863                                 msg: Some(msgs::ErrorMessage::UpdateFailHTLC {
 864                                         msg: msgs::UpdateFailHTLC {
 865                                                 channel_id: msg.channel_id,
 866                                                 htlc_id: msg.htlc_id,
 867                                                 reason: ChannelManager::build_first_hop_failure_packet(&shared_secret, 0x8000 | 0x4000 | 5, &onion_hash),
 868                                         }
 869                                 }),
 870                         });
 871                 }
 872
 873                 let mut chacha = ChaCha20::new(&rho, &[0u8; 8]);
 874                 let next_hop_data = {
 875                         let mut decoded = [0; 65];
 876                         chacha.process(&msg.onion_routing_packet.hop_data[0..65], &mut decoded);
 877                         match msgs::OnionHopData::decode(&decoded[..]) {
 878                                 Err(err) => {
 879                                         let error_code = match err {
 880                                                 msgs::DecodeError::UnknownRealmByte => 0x4000 | 1,
 881                                                 _ => 0x2000 | 2, // Should never happen
 882                                         };
 883                                         return Err(HandleError{err: "Unable to decode our hop data",
 884                                                 msg: Some(msgs::ErrorMessage::UpdateFailHTLC {
 885                                                         msg: msgs::UpdateFailHTLC {
 886                                                                 channel_id: msg.channel_id,
 887                                                                 htlc_id: msg.htlc_id,
 888                                                                 reason: ChannelManager::build_first_hop_failure_packet(&shared_secret, error_code, &[0;0]),
 889                                                         }
 890                                                 }),
 891                                         });
 892                                 },
 893                                 Ok(msg) => msg
 894                         }
 895                 };
 896
 897                 let mut pending_forward_info = if next_hop_data.hmac == [0; 32] {
 898                                 // OUR PAYMENT!
 899                                 if next_hop_data.data.amt_to_forward != msg.amount_msat {
 900                                         return Err(HandleError{err: "Upstream node sent less than we were supposed to receive in payment",
 901                                                 msg: Some(msgs::ErrorMessage::UpdateFailHTLC {
 902                                                         msg: msgs::UpdateFailHTLC {
 903                                                                 channel_id: msg.channel_id,
 904                                                                 htlc_id: msg.htlc_id,
 905                                                                 reason: ChannelManager::build_first_hop_failure_packet(&shared_secret, 19, &byte_utils::be64_to_array(msg.amount_msat)),
 906                                                         }
 907                                                 }),
 908                                         });
 909                                 }
 910                                 if next_hop_data.data.outgoing_cltv_value != msg.cltv_expiry {
 911                                         return Err(HandleError{err: "Upstream node set CLTV to the wrong value",
 912                                                 msg: Some(msgs::ErrorMessage::UpdateFailHTLC {
 913                                                         msg: msgs::UpdateFailHTLC {
 914                                                                 channel_id: msg.channel_id,
 915                                                                 htlc_id: msg.htlc_id,
 916                                                                 reason: ChannelManager::build_first_hop_failure_packet(&shared_secret, 18, &byte_utils::be32_to_array(msg.cltv_expiry)),
 917                                                         }
 918                                                 }),
 919                                         });
 920                                 }
 921
 922                                 // Note that we could obviously respond immediately with an update_fulfill_htlc
 923                                 // message, however that would leak that we are the recipient of this payment, so
 924                                 // instead we stay symmetric with the forwarding case, only responding (after a
 925                                 // delay) once they've send us a commitment_signed!
 926
 927                                 PendingForwardHTLCInfo {
 928                                         onion_packet: None,
 929                                         payment_hash: msg.payment_hash.clone(),
 930                                         short_channel_id: 0,
 931                                         prev_short_channel_id: 0,
 932                                         amt_to_forward: next_hop_data.data.amt_to_forward,
 933                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
 934                                 }
 935                         } else {
 936                                 let mut new_packet_data = [0; 20*65];
 937                                 chacha.process(&msg.onion_routing_packet.hop_data[65..], &mut new_packet_data[0..19*65]);
 938                                 chacha.process(&ChannelManager::ZERO[0..65], &mut new_packet_data[19*65..]);
 939
 940                                 let mut new_pubkey = msg.onion_routing_packet.public_key.clone();
 941
 942                                 let blinding_factor = {
 943                                         let mut sha = Sha256::new();
 944                                         sha.input(&new_pubkey.serialize()[..]);
 945                                         sha.input(&shared_secret[..]);
 946                                         let mut res = [0u8; 32];
 947                                         sha.result(&mut res);
 948                                         match SecretKey::from_slice(&self.secp_ctx, &res) {
 949                                                 Err(_) => {
 950                                                         // Return temporary node failure as its technically our issue, not the
 951                                                         // channel's issue.
 952                                                         return Err(HandleError{err: "Blinding factor is an invalid private key",
 953                                                                 msg: Some(msgs::ErrorMessage::UpdateFailHTLC {
 954                                                                         msg: msgs::UpdateFailHTLC {
 955                                                                                 channel_id: msg.channel_id,
 956                                                                                 htlc_id: msg.htlc_id,
 957                                                                                 reason: ChannelManager::build_first_hop_failure_packet(&shared_secret, 0x2000 | 2, &[0;0]),
 958                                                                         }
 959                                                                 }),
 960                                                         });
 961                                                 },
 962                                                 Ok(key) => key
 963                                         }
 964                                 };
 965
 966                                 match new_pubkey.mul_assign(&self.secp_ctx, &blinding_factor) {
 967                                         Err(_) => {
 968                                                 // Return temporary node failure as its technically our issue, not the
 969                                                 // channel's issue.
 970                                                 return Err(HandleError{err: "New blinding factor is an invalid private key",
 971                                                         msg: Some(msgs::ErrorMessage::UpdateFailHTLC {
 972                                                                 msg: msgs::UpdateFailHTLC {
 973                                                                         channel_id: msg.channel_id,
 974                                                                         htlc_id: msg.htlc_id,
 975                                                                         reason: ChannelManager::build_first_hop_failure_packet(&shared_secret, 0x2000 | 2, &[0;0]),
 976                                                                 }
 977                                                         }),
 978                                                 });
 979                                         },
 980                                         Ok(_) => {}
 981                                 };
 982
 983                                 let outgoing_packet = msgs::OnionPacket {
 984                                         version: 0,
 985                                         public_key: new_pubkey,
 986                                         hop_data: new_packet_data,
 987                                         hmac: next_hop_data.hmac.clone(),
 988                                 };
 989
 990                                 //TODO: Check amt_to_forward and outgoing_cltv_value are within acceptable ranges!
 991
 992                                 PendingForwardHTLCInfo {
 993                                         onion_packet: Some(outgoing_packet),
 994                                         payment_hash: msg.payment_hash.clone(),
 995                                         short_channel_id: next_hop_data.data.short_channel_id,
 996                                         prev_short_channel_id: 0,
 997                                         amt_to_forward: next_hop_data.data.amt_to_forward,
 998                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
 999                                 }
1000                         };
1001
1002                 let mut channels = self.channels.lock().unwrap();
1003
1004                 if pending_forward_info.short_channel_id != 0 {
1005                         let forwarding_id = match channels.short_to_id.get(&pending_forward_info.short_channel_id) {
1006                                 None => {
1007                                         return Err(HandleError{err: "Don't have available channel for forwarding as requested.",
1008                                                 msg: Some(msgs::ErrorMessage::UpdateFailHTLC {
1009                                                         msg: msgs::UpdateFailHTLC {
1010                                                                 channel_id: msg.channel_id,
1011                                                                 htlc_id: msg.htlc_id,
1012                                                                 reason: ChannelManager::build_first_hop_failure_packet(&shared_secret, 0x4000 | 10, &[0;0]),
1013                                                         }
1014                                                 }),
1015                                         });
1016                                 },
1017                                 Some(id) => id.clone(),
1018                         };
1019                         let chan = channels.by_id.get_mut(&forwarding_id).unwrap();
1020                         if !chan.is_live() {
1021                                 let chan_update = self.get_channel_update(chan).unwrap();
1022                                 return Err(HandleError{err: "Forwarding channel is not in a ready state.",
1023                                         msg: Some(msgs::ErrorMessage::UpdateFailHTLC {
1024                                                 msg: msgs::UpdateFailHTLC {
1025                                                         channel_id: msg.channel_id,
1026                                                         htlc_id: msg.htlc_id,
1027                                                         reason: ChannelManager::build_first_hop_failure_packet(&shared_secret, 0x4000 | 10, &chan_update.encode()[..]),
1028                                                 }
1029                                         }),
1030                                 });
1031                         }
1032                 }
1033
1034                 match channels.by_id.get_mut(&msg.channel_id) {
1035                         Some(chan) => {
1036                                 if chan.get_their_node_id() != *their_node_id {
1037                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1038                                 }
1039                                 if !chan.is_usable() {
1040                                         return Err(HandleError{err: "Channel not yet available for receiving HTLCs", msg: None});
1041                                 }
1042                                 pending_forward_info.prev_short_channel_id = chan.get_short_channel_id().unwrap();
1043                                 chan.update_add_htlc(&msg, pending_forward_info)
1044                         },
1045                         None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None}), //TODO: panic?
1046                 }
1047         }
1048
1049         fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) -> Result<Option<(Vec<msgs::UpdateAddHTLC>, msgs::CommitmentSigned)>, HandleError> {
1050                 let res = {
1051                         let mut channels = self.channels.lock().unwrap();
1052                         match channels.by_id.get_mut(&msg.channel_id) {
1053                                 Some(chan) => {
1054                                         if chan.get_their_node_id() != *their_node_id {
1055                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1056                                         }
1057                                         chan.update_fulfill_htlc(&msg)
1058                                 },
1059                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1060                         }
1061                 };
1062                 //TODO: Delay the claimed_funds relaying just like we do outbound relay!
1063                 self.claim_funds(msg.payment_preimage.clone());
1064                 res
1065         }
1066
1067         fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) -> Result<Option<(Vec<msgs::UpdateAddHTLC>, msgs::CommitmentSigned)>, HandleError> {
1068                 let mut channels = self.channels.lock().unwrap();
1069                 match channels.by_id.get_mut(&msg.channel_id) {
1070                         Some(chan) => {
1071                                 if chan.get_their_node_id() != *their_node_id {
1072                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1073                                 }
1074                                 chan.update_fail_htlc(&msg)
1075                         },
1076                         None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1077                 }
1078                 //TODO Pass the reason backwards through the onion channel
1079         }
1080
1081         fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) -> Result<Option<(Vec<msgs::UpdateAddHTLC>, msgs::CommitmentSigned)>, HandleError> {
1082                 let mut channels = self.channels.lock().unwrap();
1083                 match channels.by_id.get_mut(&msg.channel_id) {
1084                         Some(chan) => {
1085                                 if chan.get_their_node_id() != *their_node_id {
1086                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1087                                 }
1088                                 chan.update_fail_malformed_htlc(&msg)
1089                         },
1090                         None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1091                 }
1092         }
1093
1094         fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) -> Result<msgs::RevokeAndACK, HandleError> {
1095                 let ((res, mut forwarding_infos), monitor) = {
1096                         let mut channels = self.channels.lock().unwrap();
1097                         match channels.by_id.get_mut(&msg.channel_id) {
1098                                 Some(chan) => {
1099                                         if chan.get_their_node_id() != *their_node_id {
1100                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1101                                         }
1102                                         (chan.commitment_signed(&msg)?, chan.channel_monitor())
1103                                 },
1104                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1105                         }
1106                 };
1107                 //TODO: Only if we store HTLC sigs
1108                 self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor)?;
1109
1110                 let mut forward_event = None;
1111                 {
1112                         let mut pending_htlcs = self.pending_htlcs_forwardable.lock().unwrap();
1113                         if pending_htlcs.forward_htlcs.is_empty() {
1114                                 let mut rng = thread_rng();
1115                                 forward_event = Some(Instant::now() + Duration::from_millis(((rng.next_f32() * 4.0 + 1.0) * MIN_HTLC_RELAY_HOLDING_CELL_MILLIS as f32) as u64));
1116                                 pending_htlcs.next_forward = forward_event.unwrap();
1117                         }
1118                         for forward_info in forwarding_infos.drain(..) {
1119                                 match pending_htlcs.forward_htlcs.entry(forward_info.short_channel_id) {
1120                                         hash_map::Entry::Occupied(mut entry) => {
1121                                                 entry.get_mut().push(forward_info);
1122                                         },
1123                                         hash_map::Entry::Vacant(entry) => {
1124                                                 entry.insert(vec!(forward_info));
1125                                         }
1126                                 }
1127                         }
1128                 }
1129                 match forward_event {
1130                         Some(time) => {
1131                                 let mut pending_events = self.pending_events.lock().unwrap();
1132                                 pending_events.push(events::Event::PendingHTLCsForwardable {
1133                                         time_forwardable: time
1134                                 });
1135                         }
1136                         None => {},
1137                 }
1138
1139                 Ok(res)
1140         }
1141
1142         fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) -> Result<(), HandleError> {
1143                 let monitor = {
1144                         let mut channels = self.channels.lock().unwrap();
1145                         match channels.by_id.get_mut(&msg.channel_id) {
1146                                 Some(chan) => {
1147                                         if chan.get_their_node_id() != *their_node_id {
1148                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1149                                         }
1150                                         chan.revoke_and_ack(&msg)?;
1151                                         chan.channel_monitor()
1152                                 },
1153                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1154                         }
1155                 };
1156                 self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor)?;
1157                 Ok(())
1158         }
1159
1160         fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) -> Result<(), HandleError> {
1161                 let mut channels = self.channels.lock().unwrap();
1162                 match channels.by_id.get_mut(&msg.channel_id) {
1163                         Some(chan) => {
1164                                 if chan.get_their_node_id() != *their_node_id {
1165                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1166                                 }
1167                                 chan.update_fee(&*self.fee_estimator, &msg)
1168                         },
1169                         None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1170                 }
1171         }
1172
1173         fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) -> Result<(), HandleError> {
1174                 let (chan_announcement, chan_update) = {
1175                         let mut channels = self.channels.lock().unwrap();
1176                         match channels.by_id.get_mut(&msg.channel_id) {
1177                                 Some(chan) => {
1178                                         if chan.get_their_node_id() != *their_node_id {
1179                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1180                                         }
1181                                         if !chan.is_usable() {
1182                                                 return Err(HandleError{err: "Got an announcement_signatures before we were ready for it", msg: None });
1183                                         }
1184
1185                                         let our_node_id = self.get_our_node_id();
1186                                         let (announcement, our_bitcoin_sig) = chan.get_channel_announcement(our_node_id.clone(), self.genesis_hash.clone())?;
1187
1188                                         let were_node_one = announcement.node_id_1 == our_node_id;
1189                                         let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
1190                                         secp_call!(self.secp_ctx.verify(&msghash, &msg.node_signature, if were_node_one { &announcement.node_id_2 } else { &announcement.node_id_1 }));
1191                                         secp_call!(self.secp_ctx.verify(&msghash, &msg.bitcoin_signature, if were_node_one { &announcement.bitcoin_key_2 } else { &announcement.bitcoin_key_1 }));
1192
1193                                         let our_node_sig = secp_call!(self.secp_ctx.sign(&msghash, &self.our_network_key));
1194
1195                                         (msgs::ChannelAnnouncement {
1196                                                 node_signature_1: if were_node_one { our_node_sig } else { msg.node_signature },
1197                                                 node_signature_2: if were_node_one { msg.node_signature } else { our_node_sig },
1198                                                 bitcoin_signature_1: if were_node_one { our_bitcoin_sig } else { msg.bitcoin_signature },
1199                                                 bitcoin_signature_2: if were_node_one { msg.bitcoin_signature } else { our_bitcoin_sig },
1200                                                 contents: announcement,
1201                                         }, self.get_channel_update(chan).unwrap()) // can only fail if we're not in a ready state
1202                                 },
1203                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1204                         }
1205                 };
1206                 let mut pending_events = self.pending_events.lock().unwrap();
1207                 pending_events.push(events::Event::BroadcastChannelAnnouncement { msg: chan_announcement, update_msg: chan_update });
1208                 Ok(())
1209         }
1210 }
1211
1212 #[cfg(test)]
1213 mod tests {
1214         use ln::channelmanager::{ChannelManager,OnionKeys};
1215         use ln::router::{Route, RouteHop, Router};
1216         use ln::msgs;
1217         use ln::msgs::{MsgEncodable,ChannelMessageHandler,RoutingMessageHandler};
1218         use util::test_utils;
1219         use util::events::{Event, EventsProvider};
1220
1221         use bitcoin::util::misc::hex_bytes;
1222         use bitcoin::util::hash::Sha256dHash;
1223         use bitcoin::blockdata::block::BlockHeader;
1224         use bitcoin::blockdata::transaction::Transaction;
1225         use bitcoin::network::constants::Network;
1226         use bitcoin::network::serialize::serialize;
1227         use bitcoin::network::serialize::BitcoinHash;
1228
1229         use secp256k1::Secp256k1;
1230         use secp256k1::key::{PublicKey,SecretKey};
1231
1232         use crypto::sha2::Sha256;
1233         use crypto::digest::Digest;
1234
1235         use rand::{thread_rng,Rng};
1236
1237         use std::sync::Arc;
1238         use std::default::Default;
1239         use std::time::Instant;
1240
1241         fn build_test_onion_keys() -> Vec<OnionKeys> {
1242                 // Keys from BOLT 4, used in both test vector tests
1243                 let secp_ctx = Secp256k1::new();
1244
1245                 let route = Route {
1246                         hops: vec!(
1247                                         RouteHop {
1248                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]).unwrap(),
1249                                                 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
1250                                         },
1251                                         RouteHop {
1252                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("0324653eac434488002cc06bbfb7f10fe18991e35f9fe4302dbea6d2353dc0ab1c").unwrap()[..]).unwrap(),
1253                                                 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
1254                                         },
1255                                         RouteHop {
1256                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("027f31ebc5462c1fdce1b737ecff52d37d75dea43ce11c74d25aa297165faa2007").unwrap()[..]).unwrap(),
1257                                                 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
1258                                         },
1259                                         RouteHop {
1260                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]).unwrap(),
1261                                                 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
1262                                         },
1263                                         RouteHop {
1264                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("02edabbd16b41c8371b92ef2f04c1185b4f03b6dcd52ba9b78d9d7c89c8f221145").unwrap()[..]).unwrap(),
1265                                                 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
1266                                         },
1267                         ),
1268                 };
1269
1270                 let session_priv = SecretKey::from_slice(&secp_ctx, &hex_bytes("4141414141414141414141414141414141414141414141414141414141414141").unwrap()[..]).unwrap();
1271
1272                 let onion_keys = ChannelManager::construct_onion_keys(&secp_ctx, &route, &session_priv).unwrap();
1273                 assert_eq!(onion_keys.len(), route.hops.len());
1274                 onion_keys
1275         }
1276
1277         #[test]
1278         fn onion_vectors() {
1279                 // Packet creation test vectors from BOLT 4
1280                 let onion_keys = build_test_onion_keys();
1281
1282                 assert_eq!(onion_keys[0].shared_secret[..], hex_bytes("53eb63ea8a3fec3b3cd433b85cd62a4b145e1dda09391b348c4e1cd36a03ea66").unwrap()[..]);
1283                 assert_eq!(onion_keys[0].blinding_factor[..], hex_bytes("2ec2e5da605776054187180343287683aa6a51b4b1c04d6dd49c45d8cffb3c36").unwrap()[..]);
1284                 assert_eq!(onion_keys[0].ephemeral_pubkey.serialize()[..], hex_bytes("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]);
1285                 assert_eq!(onion_keys[0].rho, hex_bytes("ce496ec94def95aadd4bec15cdb41a740c9f2b62347c4917325fcc6fb0453986").unwrap()[..]);
1286                 assert_eq!(onion_keys[0].mu, hex_bytes("b57061dc6d0a2b9f261ac410c8b26d64ac5506cbba30267a649c28c179400eba").unwrap()[..]);
1287
1288                 assert_eq!(onion_keys[1].shared_secret[..], hex_bytes("a6519e98832a0b179f62123b3567c106db99ee37bef036e783263602f3488fae").unwrap()[..]);
1289                 assert_eq!(onion_keys[1].blinding_factor[..], hex_bytes("bf66c28bc22e598cfd574a1931a2bafbca09163df2261e6d0056b2610dab938f").unwrap()[..]);
1290                 assert_eq!(onion_keys[1].ephemeral_pubkey.serialize()[..], hex_bytes("028f9438bfbf7feac2e108d677e3a82da596be706cc1cf342b75c7b7e22bf4e6e2").unwrap()[..]);
1291                 assert_eq!(onion_keys[1].rho, hex_bytes("450ffcabc6449094918ebe13d4f03e433d20a3d28a768203337bc40b6e4b2c59").unwrap()[..]);
1292                 assert_eq!(onion_keys[1].mu, hex_bytes("05ed2b4a3fb023c2ff5dd6ed4b9b6ea7383f5cfe9d59c11d121ec2c81ca2eea9").unwrap()[..]);
1293
1294                 assert_eq!(onion_keys[2].shared_secret[..], hex_bytes("3a6b412548762f0dbccce5c7ae7bb8147d1caf9b5471c34120b30bc9c04891cc").unwrap()[..]);
1295                 assert_eq!(onion_keys[2].blinding_factor[..], hex_bytes("a1f2dadd184eb1627049673f18c6325814384facdee5bfd935d9cb031a1698a5").unwrap()[..]);
1296                 assert_eq!(onion_keys[2].ephemeral_pubkey.serialize()[..], hex_bytes("03bfd8225241ea71cd0843db7709f4c222f62ff2d4516fd38b39914ab6b83e0da0").unwrap()[..]);
1297                 assert_eq!(onion_keys[2].rho, hex_bytes("11bf5c4f960239cb37833936aa3d02cea82c0f39fd35f566109c41f9eac8deea").unwrap()[..]);
1298                 assert_eq!(onion_keys[2].mu, hex_bytes("caafe2820fa00eb2eeb78695ae452eba38f5a53ed6d53518c5c6edf76f3f5b78").unwrap()[..]);
1299
1300                 assert_eq!(onion_keys[3].shared_secret[..], hex_bytes("21e13c2d7cfe7e18836df50872466117a295783ab8aab0e7ecc8c725503ad02d").unwrap()[..]);
1301                 assert_eq!(onion_keys[3].blinding_factor[..], hex_bytes("7cfe0b699f35525029ae0fa437c69d0f20f7ed4e3916133f9cacbb13c82ff262").unwrap()[..]);
1302                 assert_eq!(onion_keys[3].ephemeral_pubkey.serialize()[..], hex_bytes("031dde6926381289671300239ea8e57ffaf9bebd05b9a5b95beaf07af05cd43595").unwrap()[..]);
1303                 assert_eq!(onion_keys[3].rho, hex_bytes("cbe784ab745c13ff5cffc2fbe3e84424aa0fd669b8ead4ee562901a4a4e89e9e").unwrap()[..]);
1304                 assert_eq!(onion_keys[3].mu, hex_bytes("5052aa1b3d9f0655a0932e50d42f0c9ba0705142c25d225515c45f47c0036ee9").unwrap()[..]);
1305
1306                 assert_eq!(onion_keys[4].shared_secret[..], hex_bytes("b5756b9b542727dbafc6765a49488b023a725d631af688fc031217e90770c328").unwrap()[..]);
1307                 assert_eq!(onion_keys[4].blinding_factor[..], hex_bytes("c96e00dddaf57e7edcd4fb5954be5b65b09f17cb6d20651b4e90315be5779205").unwrap()[..]);
1308                 assert_eq!(onion_keys[4].ephemeral_pubkey.serialize()[..], hex_bytes("03a214ebd875aab6ddfd77f22c5e7311d7f77f17a169e599f157bbcdae8bf071f4").unwrap()[..]);
1309                 assert_eq!(onion_keys[4].rho, hex_bytes("034e18b8cc718e8af6339106e706c52d8df89e2b1f7e9142d996acf88df8799b").unwrap()[..]);
1310                 assert_eq!(onion_keys[4].mu, hex_bytes("8e45e5c61c2b24cb6382444db6698727afb063adecd72aada233d4bf273d975a").unwrap()[..]);
1311
1312                 // Test vectors below are flat-out wrong: they claim to set outgoing_cltv_value to non-0 :/
1313                 let payloads = vec!(
1314                         msgs::OnionHopData {
1315                                 realm: 0,
1316                                 data: msgs::OnionRealm0HopData {
1317                                         short_channel_id: 0,
1318                                         amt_to_forward: 0,
1319                                         outgoing_cltv_value: 0,
1320                                 },
1321                                 hmac: [0; 32],
1322                         },
1323                         msgs::OnionHopData {
1324                                 realm: 0,
1325                                 data: msgs::OnionRealm0HopData {
1326                                         short_channel_id: 0x0101010101010101,
1327                                         amt_to_forward: 0x0100000001,
1328                                         outgoing_cltv_value: 0,
1329                                 },
1330                                 hmac: [0; 32],
1331                         },
1332                         msgs::OnionHopData {
1333                                 realm: 0,
1334                                 data: msgs::OnionRealm0HopData {
1335                                         short_channel_id: 0x0202020202020202,
1336                                         amt_to_forward: 0x0200000002,
1337                                         outgoing_cltv_value: 0,
1338                                 },
1339                                 hmac: [0; 32],
1340                         },
1341                         msgs::OnionHopData {
1342                                 realm: 0,
1343                                 data: msgs::OnionRealm0HopData {
1344                                         short_channel_id: 0x0303030303030303,
1345                                         amt_to_forward: 0x0300000003,
1346                                         outgoing_cltv_value: 0,
1347                                 },
1348                                 hmac: [0; 32],
1349                         },
1350                         msgs::OnionHopData {
1351                                 realm: 0,
1352                                 data: msgs::OnionRealm0HopData {
1353                                         short_channel_id: 0x0404040404040404,
1354                                         amt_to_forward: 0x0400000004,
1355                                         outgoing_cltv_value: 0,
1356                                 },
1357                                 hmac: [0; 32],
1358                         },
1359                 );
1360
1361                 let packet = ChannelManager::construct_onion_packet(payloads, onion_keys, hex_bytes("4242424242424242424242424242424242424242424242424242424242424242").unwrap()).unwrap();
1362                 // Just check the final packet encoding, as it includes all the per-hop vectors in it
1363                 // anyway...
1364                 assert_eq!(packet.encode(), hex_bytes("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").unwrap());
1365         }
1366
1367         #[test]
1368         fn test_failure_packet_onion() {
1369                 // Returning Errors test vectors from BOLT 4
1370
1371                 let onion_keys = build_test_onion_keys();
1372                 let onion_error = ChannelManager::build_failure_packet(&onion_keys[4].shared_secret, 0x2002, &[0; 0]);
1373                 assert_eq!(onion_error.encode(), hex_bytes("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").unwrap());
1374
1375                 let onion_packet_1 = ChannelManager::encrypt_failure_packet(&onion_keys[4].shared_secret, &onion_error.encode()[..]);
1376                 assert_eq!(onion_packet_1.data, hex_bytes("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").unwrap());
1377
1378                 let onion_packet_2 = ChannelManager::encrypt_failure_packet(&onion_keys[3].shared_secret, &onion_packet_1.data[..]);
1379                 assert_eq!(onion_packet_2.data, hex_bytes("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").unwrap());
1380
1381                 let onion_packet_3 = ChannelManager::encrypt_failure_packet(&onion_keys[2].shared_secret, &onion_packet_2.data[..]);
1382                 assert_eq!(onion_packet_3.data, hex_bytes("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").unwrap());
1383
1384                 let onion_packet_4 = ChannelManager::encrypt_failure_packet(&onion_keys[1].shared_secret, &onion_packet_3.data[..]);
1385                 assert_eq!(onion_packet_4.data, hex_bytes("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").unwrap());
1386
1387                 let onion_packet_5 = ChannelManager::encrypt_failure_packet(&onion_keys[0].shared_secret, &onion_packet_4.data[..]);
1388                 assert_eq!(onion_packet_5.data, hex_bytes("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").unwrap());
1389         }
1390
1391         static mut CHAN_COUNT: u16 = 0;
1392         fn confirm_transaction(chain: &test_utils::TestWatchInterface, tx: &Transaction) {
1393                 let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
1394                 let chan_id = unsafe { CHAN_COUNT };
1395                 chain.watch_util.do_call_block_connected(&header, 1, &[tx; 1], &[chan_id as u32; 1]);
1396                 for i in 2..100 {
1397                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
1398                         chain.watch_util.do_call_block_connected(&header, i, &[tx; 0], &[0; 0]);
1399                 }
1400         }
1401
1402         fn create_chan_between_nodes(node_a: &ChannelManager, chain_a: &test_utils::TestWatchInterface, node_b: &ChannelManager, chain_b: &test_utils::TestWatchInterface) -> (msgs::ChannelAnnouncement, msgs::ChannelUpdate, msgs::ChannelUpdate) {
1403                 let open_chan = node_a.create_channel(node_b.get_our_node_id(), (1 << 24) - 1, 42).unwrap();
1404                 let accept_chan = node_b.handle_open_channel(&node_a.get_our_node_id(), &open_chan).unwrap();
1405                 node_a.handle_accept_channel(&node_b.get_our_node_id(), &accept_chan).unwrap();
1406
1407                 let chan_id = unsafe { CHAN_COUNT };
1408                 let tx = Transaction { version: chan_id as u32, lock_time: 0, input: Vec::new(), output: Vec::new(), witness: Vec::new() };
1409                 let funding_output = (Sha256dHash::from_data(&serialize(&tx).unwrap()[..]), chan_id);
1410
1411                 let events_1 = node_a.get_and_clear_pending_events();
1412                 assert_eq!(events_1.len(), 1);
1413                 match events_1[0] {
1414                         Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, output_script: _, user_channel_id } => {
1415                                 assert_eq!(*channel_value_satoshis, (1 << 24) - 1);
1416                                 assert_eq!(user_channel_id, 42);
1417
1418                                 node_a.funding_transaction_generated(&temporary_channel_id, funding_output.clone());
1419                                 //TODO: Check that we got added to chan_monitor_a!
1420                         },
1421                         _ => panic!("Unexpected event"),
1422                 }
1423
1424                 let events_2 = node_a.get_and_clear_pending_events();
1425                 assert_eq!(events_2.len(), 1);
1426                 let funding_signed = match events_2[0] {
1427                         Event::SendFundingCreated { ref node_id, ref msg } => {
1428                                 assert_eq!(*node_id, node_b.get_our_node_id());
1429                                 node_b.handle_funding_created(&node_a.get_our_node_id(), msg).unwrap()
1430                                 //TODO: Check that we got added to chan_monitor_b!
1431                         },
1432                         _ => panic!("Unexpected event"),
1433                 };
1434
1435                 node_a.handle_funding_signed(&node_b.get_our_node_id(), &funding_signed).unwrap();
1436
1437                 let events_3 = node_a.get_and_clear_pending_events();
1438                 assert_eq!(events_3.len(), 1);
1439                 match events_3[0] {
1440                         Event::FundingBroadcastSafe { ref funding_txo, user_channel_id } => {
1441                                 assert_eq!(user_channel_id, 42);
1442                                 assert_eq!(*funding_txo, funding_output);
1443                         },
1444                         _ => panic!("Unexpected event"),
1445                 };
1446
1447                 confirm_transaction(&chain_a, &tx);
1448                 let events_4 = node_a.get_and_clear_pending_events();
1449                 assert_eq!(events_4.len(), 1);
1450                 match events_4[0] {
1451                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
1452                                 assert_eq!(*node_id, node_b.get_our_node_id());
1453                                 assert!(announcement_sigs.is_none());
1454                                 node_b.handle_funding_locked(&node_a.get_our_node_id(), msg).unwrap()
1455                         },
1456                         _ => panic!("Unexpected event"),
1457                 };
1458
1459                 confirm_transaction(&chain_b, &tx);
1460                 let events_5 = node_b.get_and_clear_pending_events();
1461                 assert_eq!(events_5.len(), 1);
1462                 let as_announcement_sigs = match events_5[0] {
1463                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
1464                                 assert_eq!(*node_id, node_a.get_our_node_id());
1465                                 let as_announcement_sigs = node_a.handle_funding_locked(&node_b.get_our_node_id(), msg).unwrap().unwrap();
1466                                 node_a.handle_announcement_signatures(&node_b.get_our_node_id(), &(*announcement_sigs).clone().unwrap()).unwrap();
1467                                 as_announcement_sigs
1468                         },
1469                         _ => panic!("Unexpected event"),
1470                 };
1471
1472                 let events_6 = node_a.get_and_clear_pending_events();
1473                 assert_eq!(events_6.len(), 1);
1474                 let (announcement, as_update) = match events_6[0] {
1475                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
1476                                 (msg, update_msg)
1477                         },
1478                         _ => panic!("Unexpected event"),
1479                 };
1480
1481                 node_b.handle_announcement_signatures(&node_a.get_our_node_id(), &as_announcement_sigs).unwrap();
1482                 let events_7 = node_b.get_and_clear_pending_events();
1483                 assert_eq!(events_7.len(), 1);
1484                 let bs_update = match events_7[0] {
1485                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
1486                                 assert!(*announcement == *msg);
1487                                 update_msg
1488                         },
1489                         _ => panic!("Unexpected event"),
1490                 };
1491
1492                 unsafe {
1493                         CHAN_COUNT += 1;
1494                 }
1495
1496                 ((*announcement).clone(), (*as_update).clone(), (*bs_update).clone())
1497         }
1498
1499         struct SendEvent {
1500                 node_id: PublicKey,
1501                 msgs: Vec<msgs::UpdateAddHTLC>,
1502                 commitment_msg: msgs::CommitmentSigned,
1503         }
1504         impl SendEvent {
1505                 fn from_event(event: Event) -> SendEvent {
1506                         match event {
1507                                 Event::SendHTLCs{ node_id, msgs, commitment_msg } => {
1508                                         SendEvent { node_id: node_id, msgs: msgs, commitment_msg: commitment_msg }
1509                                 },
1510                                 _ => panic!("Unexpected event type!"),
1511                         }
1512                 }
1513         }
1514
1515         static mut PAYMENT_COUNT: u8 = 0;
1516         fn send_payment(origin_node: &ChannelManager, origin_router: &Router, expected_route: &[&ChannelManager]) {
1517                 let route = origin_router.get_route(&expected_route.last().unwrap().get_our_node_id(), &Vec::new(), 1000000, 142).unwrap();
1518                 assert_eq!(route.hops.len(), expected_route.len());
1519                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
1520                         assert_eq!(hop.pubkey, node.get_our_node_id());
1521                 }
1522
1523                 let payment_preimage = unsafe { [PAYMENT_COUNT; 32] };
1524                 unsafe { PAYMENT_COUNT += 1 };
1525                 let our_payment_hash = {
1526                         let mut sha = Sha256::new();
1527                         sha.input(&payment_preimage[..]);
1528                         let mut ret = [0; 32];
1529                         sha.result(&mut ret);
1530                         ret
1531                 };
1532
1533                 let mut payment_event = {
1534                         let msgs = origin_node.send_payment(&route, our_payment_hash).unwrap().unwrap();
1535                         SendEvent {
1536                                 node_id: expected_route[0].get_our_node_id(),
1537                                 msgs: vec!(msgs.0),
1538                                 commitment_msg: msgs.1,
1539                         }
1540                 };
1541                 let mut prev_node = origin_node;
1542
1543                 for (idx, node) in expected_route.iter().enumerate() {
1544                         assert_eq!(node.get_our_node_id(), payment_event.node_id);
1545
1546                         node.handle_update_add_htlc(&prev_node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
1547                         let revoke_and_ack = node.handle_commitment_signed(&prev_node.get_our_node_id(), &payment_event.commitment_msg).unwrap();
1548                         prev_node.handle_revoke_and_ack(&node.get_our_node_id(), &revoke_and_ack).unwrap();
1549
1550                         let events_1 = node.get_and_clear_pending_events();
1551                         assert_eq!(events_1.len(), 1);
1552                         match events_1[0] {
1553                                 Event::PendingHTLCsForwardable { .. } => { },
1554                                 _ => panic!("Unexpected event"),
1555                         };
1556
1557                         node.pending_htlcs_forwardable.lock().unwrap().next_forward = Instant::now();
1558                         node.process_pending_htlc_forward();
1559
1560                         let mut events_2 = node.get_and_clear_pending_events();
1561                         assert_eq!(events_2.len(), 1);
1562                         if idx == expected_route.len() - 1 {
1563                                 match events_2[0] {
1564                                         Event::PaymentReceived { ref payment_hash, amt } => {
1565                                                 assert_eq!(our_payment_hash, *payment_hash);
1566                                                 assert_eq!(amt, 1000000);
1567                                         },
1568                                         _ => panic!("Unexpected event"),
1569                                 }
1570                         } else {
1571                                 for event in events_2.drain(..) {
1572                                         payment_event = SendEvent::from_event(event);
1573                                 }
1574                                 assert_eq!(payment_event.msgs.len(), 1);
1575                         }
1576
1577                         prev_node = node;
1578                 }
1579
1580                 assert!(expected_route.last().unwrap().claim_funds(payment_preimage));
1581
1582                 let mut expected_next_node = expected_route.last().unwrap().get_our_node_id();
1583                 let mut prev_node = expected_route.last().unwrap();
1584                 let mut next_msg = None;
1585                 for node in expected_route.iter().rev() {
1586                         assert_eq!(expected_next_node, node.get_our_node_id());
1587                         match next_msg {
1588                                 Some(msg) => {
1589                                         assert!(node.handle_update_fulfill_htlc(&prev_node.get_our_node_id(), &msg).unwrap().is_none());
1590                                 }, None => {}
1591                         }
1592
1593                         let events = node.get_and_clear_pending_events();
1594                         assert_eq!(events.len(), 1);
1595                         match events[0] {
1596                                 Event::SendFulfillHTLC { ref node_id, ref msg } => {
1597                                         expected_next_node = node_id.clone();
1598                                         next_msg = Some(msg.clone());
1599                                 },
1600                                 _ => panic!("Unexpected event"),
1601                         };
1602
1603                         prev_node = node;
1604                 }
1605
1606                 assert_eq!(expected_next_node, origin_node.get_our_node_id());
1607                 assert!(origin_node.handle_update_fulfill_htlc(&expected_route.first().unwrap().get_our_node_id(), &next_msg.unwrap()).unwrap().is_none());
1608         }
1609
1610         #[test]
1611         fn fake_network_test() {
1612                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
1613                 // tests that payments get routed and transactions broadcast in semi-reasonable ways.
1614                 let mut rng = thread_rng();
1615                 let secp_ctx = Secp256k1::new();
1616
1617                 let feeest_1 = Arc::new(test_utils::TestFeeEstimator { sat_per_vbyte: 1 });
1618                 let chain_monitor_1 = Arc::new(test_utils::TestWatchInterface::new());
1619                 let chan_monitor_1 = Arc::new(test_utils::TestChannelMonitor{});
1620                 let node_id_1 = {
1621                         let mut key_slice = [0; 32];
1622                         rng.fill_bytes(&mut key_slice);
1623                         SecretKey::from_slice(&secp_ctx, &key_slice).unwrap()
1624                 };
1625                 let node_1 = ChannelManager::new(node_id_1.clone(), 0, true, Network::Testnet, feeest_1.clone(), chan_monitor_1.clone(), chain_monitor_1.clone()).unwrap();
1626                 let router_1 = Router::new(PublicKey::from_secret_key(&secp_ctx, &node_id_1).unwrap());
1627
1628                 let feeest_2 = Arc::new(test_utils::TestFeeEstimator { sat_per_vbyte: 1 });
1629                 let chain_monitor_2 = Arc::new(test_utils::TestWatchInterface::new());
1630                 let chan_monitor_2 = Arc::new(test_utils::TestChannelMonitor{});
1631                 let node_id_2 = {
1632                         let mut key_slice = [0; 32];
1633                         rng.fill_bytes(&mut key_slice);
1634                         SecretKey::from_slice(&secp_ctx, &key_slice).unwrap()
1635                 };
1636                 let node_2 = ChannelManager::new(node_id_2.clone(), 0, true, Network::Testnet, feeest_2.clone(), chan_monitor_2.clone(), chain_monitor_2.clone()).unwrap();
1637                 let router_2 = Router::new(PublicKey::from_secret_key(&secp_ctx, &node_id_2).unwrap());
1638
1639                 let feeest_3 = Arc::new(test_utils::TestFeeEstimator { sat_per_vbyte: 1 });
1640                 let chain_monitor_3 = Arc::new(test_utils::TestWatchInterface::new());
1641                 let chan_monitor_3 = Arc::new(test_utils::TestChannelMonitor{});
1642                 let node_id_3 = {
1643                         let mut key_slice = [0; 32];
1644                         rng.fill_bytes(&mut key_slice);
1645                         SecretKey::from_slice(&secp_ctx, &key_slice).unwrap()
1646                 };
1647                 let node_3 = ChannelManager::new(node_id_3.clone(), 0, true, Network::Testnet, feeest_3.clone(), chan_monitor_3.clone(), chain_monitor_3.clone()).unwrap();
1648                 let router_3 = Router::new(PublicKey::from_secret_key(&secp_ctx, &node_id_3).unwrap());
1649
1650                 let feeest_4 = Arc::new(test_utils::TestFeeEstimator { sat_per_vbyte: 1 });
1651                 let chain_monitor_4 = Arc::new(test_utils::TestWatchInterface::new());
1652                 let chan_monitor_4 = Arc::new(test_utils::TestChannelMonitor{});
1653                 let node_id_4 = {
1654                         let mut key_slice = [0; 32];
1655                         rng.fill_bytes(&mut key_slice);
1656                         SecretKey::from_slice(&secp_ctx, &key_slice).unwrap()
1657                 };
1658                 let node_4 = ChannelManager::new(node_id_4.clone(), 0, true, Network::Testnet, feeest_4.clone(), chan_monitor_4.clone(), chain_monitor_4.clone()).unwrap();
1659                 let router_4 = Router::new(PublicKey::from_secret_key(&secp_ctx, &node_id_4).unwrap());
1660
1661                 // Create some initial channels
1662                 let chan_announcement_1 = create_chan_between_nodes(&node_1, &chain_monitor_1, &node_2, &chain_monitor_2);
1663                 for router in vec!(&router_1, &router_2, &router_3, &router_4) {
1664                         assert!(router.handle_channel_announcement(&chan_announcement_1.0).unwrap());
1665                         router.handle_channel_update(&chan_announcement_1.1).unwrap();
1666                         router.handle_channel_update(&chan_announcement_1.2).unwrap();
1667                 }
1668                 let chan_announcement_2 = create_chan_between_nodes(&node_2, &chain_monitor_2, &node_3, &chain_monitor_3);
1669                 for router in vec!(&router_1, &router_2, &router_3, &router_4) {
1670                         assert!(router.handle_channel_announcement(&chan_announcement_2.0).unwrap());
1671                         router.handle_channel_update(&chan_announcement_2.1).unwrap();
1672                         router.handle_channel_update(&chan_announcement_2.2).unwrap();
1673                 }
1674                 let chan_announcement_3 = create_chan_between_nodes(&node_3, &chain_monitor_3, &node_4, &chain_monitor_4);
1675                 for router in vec!(&router_1, &router_2, &router_3, &router_4) {
1676                         assert!(router.handle_channel_announcement(&chan_announcement_3.0).unwrap());
1677                         router.handle_channel_update(&chan_announcement_3.1).unwrap();
1678                         router.handle_channel_update(&chan_announcement_3.2).unwrap();
1679                 }
1680
1681                 // Send some payments
1682                 send_payment(&node_1, &router_1, &vec!(&*node_2, &*node_3, &*node_4)[..]);
1683                 send_payment(&node_2, &router_2, &vec!(&*node_3, &*node_4)[..]);
1684                 send_payment(&node_4, &router_4, &vec!(&*node_3, &*node_2, &*node_1)[..]);
1685
1686                 // Add a new channel that skips 3
1687                 let chan_announcement_4 = create_chan_between_nodes(&node_2, &chain_monitor_2, &node_4, &chain_monitor_4);
1688                 for router in vec!(&router_1, &router_2, &router_3, &router_4) {
1689                         assert!(router.handle_channel_announcement(&chan_announcement_4.0).unwrap());
1690                         router.handle_channel_update(&chan_announcement_4.1).unwrap();
1691                         router.handle_channel_update(&chan_announcement_4.2).unwrap();
1692                 }
1693
1694                 send_payment(&node_1, &router_1, &vec!(&*node_2, &*node_4)[..]);
1695
1696                 // Check that we processed all pending events
1697                 for node in vec!(&node_1, &node_2, &node_3, &node_4) {
1698                         assert_eq!(node.get_and_clear_pending_events().len(), 0);
1699                 }
1700         }
1701 }