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

   1 use bitcoin::blockdata::block::BlockHeader;
   2 use bitcoin::blockdata::transaction::Transaction;
   3 use bitcoin::blockdata::constants::genesis_block;
   4 use bitcoin::network::constants::Network;
   5 use bitcoin::network::serialize::BitcoinHash;
   6 use bitcoin::util::hash::Sha256dHash;
   7
   8 use secp256k1::key::{SecretKey,PublicKey};
   9 use secp256k1::{Secp256k1,Message};
  10 use secp256k1::ecdh::SharedSecret;
  11 use secp256k1;
  12
  13 use chain::chaininterface::{BroadcasterInterface,ChainListener,ChainWatchInterface,FeeEstimator};
  14 use chain::transaction::OutPoint;
  15 use ln::channel::{Channel, ChannelKeys};
  16 use ln::channelmonitor::ManyChannelMonitor;
  17 use ln::router::{Route,RouteHop};
  18 use ln::msgs;
  19 use ln::msgs::{HandleError,ChannelMessageHandler,MsgEncodable,MsgDecodable};
  20 use util::{byte_utils, events, internal_traits, rng};
  21 use util::sha2::Sha256;
  22
  23 use crypto;
  24 use crypto::mac::{Mac,MacResult};
  25 use crypto::hmac::Hmac;
  26 use crypto::digest::Digest;
  27 use crypto::symmetriccipher::SynchronousStreamCipher;
  28 use crypto::chacha20::ChaCha20;
  29
  30 use std::sync::{Mutex,MutexGuard,Arc};
  31 use std::collections::HashMap;
  32 use std::collections::hash_map;
  33 use std::{ptr, mem};
  34 use std::time::{Instant,Duration};
  35
  36 mod channel_held_info {
  37         use ln::msgs;
  38
  39         /// Stores the info we will need to send when we want to forward an HTLC onwards
  40         pub struct PendingForwardHTLCInfo {
  41                 pub(super) onion_packet: Option<msgs::OnionPacket>,
  42                 pub(super) payment_hash: [u8; 32],
  43                 pub(super) short_channel_id: u64,
  44                 pub(super) prev_short_channel_id: u64,
  45                 pub(super) amt_to_forward: u64,
  46                 pub(super) outgoing_cltv_value: u32,
  47         }
  48
  49         #[cfg(feature = "fuzztarget")]
  50         impl PendingForwardHTLCInfo {
  51                 pub fn dummy() -> Self {
  52                         Self {
  53                                 onion_packet: None,
  54                                 payment_hash: [0; 32],
  55                                 short_channel_id: 0,
  56                                 prev_short_channel_id: 0,
  57                                 amt_to_forward: 0,
  58                                 outgoing_cltv_value: 0,
  59                         }
  60                 }
  61         }
  62
  63         #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
  64         pub enum HTLCFailReason {
  65                 ErrorPacket {
  66                         err: msgs::OnionErrorPacket,
  67                 },
  68                 Reason {
  69                         failure_code: u16,
  70                         data: Vec<u8>,
  71                 }
  72         }
  73
  74         #[cfg(feature = "fuzztarget")]
  75         impl HTLCFailReason {
  76                 pub fn dummy() -> Self {
  77                         HTLCFailReason::Reason {
  78                                 failure_code: 0, data: Vec::new(),
  79                         }
  80                 }
  81         }
  82 }
  83 #[cfg(feature = "fuzztarget")]
  84 pub use self::channel_held_info::*;
  85 #[cfg(not(feature = "fuzztarget"))]
  86 pub(crate) use self::channel_held_info::*;
  87
  88 enum PendingOutboundHTLC {
  89         IntermediaryHopData {
  90                 source_short_channel_id: u64,
  91                 incoming_packet_shared_secret: SharedSecret,
  92         },
  93         OutboundRoute {
  94                 route: Route,
  95                 session_priv: SecretKey,
  96         },
  97         /// Used for channel rebalancing
  98         CycledRoute {
  99                 source_short_channel_id: u64,
 100                 incoming_packet_shared_secret: SharedSecret,
 101                 route: Route,
 102                 session_priv: SecretKey,
 103         }
 104 }
 105
 106 /// We hold back HTLCs we intend to relay for a random interval in the range (this, 5*this). This
 107 /// provides some limited amount of privacy. Ideally this would range from somewhere like 1 second
 108 /// to 30 seconds, but people expect lightning to be, you know, kinda fast, sadly. We could
 109 /// probably increase this significantly.
 110 const MIN_HTLC_RELAY_HOLDING_CELL_MILLIS: u32 = 50;
 111
 112 struct ChannelHolder {
 113         by_id: HashMap<[u8; 32], Channel>,
 114         short_to_id: HashMap<u64, [u8; 32]>,
 115         next_forward: Instant,
 116         /// short channel id -> forward infos. Key of 0 means payments received
 117         forward_htlcs: HashMap<u64, Vec<PendingForwardHTLCInfo>>,
 118         claimable_htlcs: HashMap<[u8; 32], PendingOutboundHTLC>,
 119 }
 120 struct MutChannelHolder<'a> {
 121         by_id: &'a mut HashMap<[u8; 32], Channel>,
 122         short_to_id: &'a mut HashMap<u64, [u8; 32]>,
 123         next_forward: &'a mut Instant,
 124         /// short channel id -> forward infos. Key of 0 means payments received
 125         forward_htlcs: &'a mut HashMap<u64, Vec<PendingForwardHTLCInfo>>,
 126         claimable_htlcs: &'a mut HashMap<[u8; 32], PendingOutboundHTLC>,
 127 }
 128 impl ChannelHolder {
 129         fn borrow_parts(&mut self) -> MutChannelHolder {
 130                 MutChannelHolder {
 131                         by_id: &mut self.by_id,
 132                         short_to_id: &mut self.short_to_id,
 133                         next_forward: &mut self.next_forward,
 134                         /// short channel id -> forward infos. Key of 0 means payments received
 135                         forward_htlcs: &mut self.forward_htlcs,
 136                         claimable_htlcs: &mut self.claimable_htlcs,
 137                 }
 138         }
 139 }
 140
 141 /// Manager which keeps track of a number of channels and sends messages to the appropriate
 142 /// channel, also tracking HTLC preimages and forwarding onion packets appropriately.
 143 /// Implements ChannelMessageHandler, handling the multi-channel parts and passing things through
 144 /// to individual Channels.
 145 pub struct ChannelManager {
 146         genesis_hash: Sha256dHash,
 147         fee_estimator: Arc<FeeEstimator>,
 148         monitor: Arc<ManyChannelMonitor>,
 149         chain_monitor: Arc<ChainWatchInterface>,
 150         tx_broadcaster: Arc<BroadcasterInterface>,
 151
 152         announce_channels_publicly: bool,
 153         fee_proportional_millionths: u32,
 154         secp_ctx: Secp256k1,
 155
 156         channel_state: Mutex<ChannelHolder>,
 157         our_network_key: SecretKey,
 158
 159         pending_events: Mutex<Vec<events::Event>>,
 160 }
 161
 162 const CLTV_EXPIRY_DELTA: u16 = 6 * 24 * 2; //TODO?
 163
 164 macro_rules! secp_call {
 165         ( $res : expr ) => {
 166                 match $res {
 167                         Ok(key) => key,
 168                         //TODO: Make the err a parameter!
 169                         Err(_) => return Err(HandleError{err: "Key error", action: None})
 170                 }
 171         };
 172 }
 173
 174 struct OnionKeys {
 175         #[cfg(test)]
 176         shared_secret: SharedSecret,
 177         #[cfg(test)]
 178         blinding_factor: [u8; 32],
 179         ephemeral_pubkey: PublicKey,
 180         rho: [u8; 32],
 181         mu: [u8; 32],
 182 }
 183
 184 pub struct ChannelDetails {
 185         /// The channel's ID (prior to funding transaction generation, this is a random 32 bytes,
 186         /// thereafter this is the txid of the funding transaction xor the funding transaction output).
 187         /// Note that this means this value is *not* persistent - it can change once during the
 188         /// lifetime of the channel.
 189         pub channel_id: [u8; 32],
 190         /// The position of the funding transaction in the chain. None if the funding transaction has
 191         /// not yet been confirmed and the channel fully opened.
 192         pub short_channel_id: Option<u64>,
 193         pub remote_network_id: PublicKey,
 194         pub channel_value_satoshis: u64,
 195         /// The user_id passed in to create_channel, or 0 if the channel was inbound.
 196         pub user_id: u64,
 197 }
 198
 199 impl ChannelManager {
 200         /// Constructs a new ChannelManager to hold several channels and route between them. This is
 201         /// the main "logic hub" for all channel-related actions, and implements ChannelMessageHandler.
 202         /// fee_proportional_millionths is an optional fee to charge any payments routed through us.
 203         /// Non-proportional fees are fixed according to our risk using the provided fee estimator.
 204         /// panics if channel_value_satoshis is >= `MAX_FUNDING_SATOSHIS`!
 205         pub fn new(our_network_key: SecretKey, fee_proportional_millionths: u32, announce_channels_publicly: bool, network: Network, feeest: Arc<FeeEstimator>, monitor: Arc<ManyChannelMonitor>, chain_monitor: Arc<ChainWatchInterface>, tx_broadcaster: Arc<BroadcasterInterface>) -> Result<Arc<ChannelManager>, secp256k1::Error> {
 206                 let secp_ctx = Secp256k1::new();
 207
 208                 let res = Arc::new(ChannelManager {
 209                         genesis_hash: genesis_block(network).header.bitcoin_hash(),
 210                         fee_estimator: feeest.clone(),
 211                         monitor: monitor.clone(),
 212                         chain_monitor,
 213                         tx_broadcaster,
 214
 215                         announce_channels_publicly,
 216                         fee_proportional_millionths,
 217                         secp_ctx,
 218
 219                         channel_state: Mutex::new(ChannelHolder{
 220                                 by_id: HashMap::new(),
 221                                 short_to_id: HashMap::new(),
 222                                 next_forward: Instant::now(),
 223                                 forward_htlcs: HashMap::new(),
 224                                 claimable_htlcs: HashMap::new(),
 225                         }),
 226                         our_network_key,
 227
 228                         pending_events: Mutex::new(Vec::new()),
 229                 });
 230                 let weak_res = Arc::downgrade(&res);
 231                 res.chain_monitor.register_listener(weak_res);
 232                 Ok(res)
 233         }
 234
 235         /// Creates a new outbound channel to the given remote node and with the given value.
 236         /// user_id will be provided back as user_channel_id in FundingGenerationReady and
 237         /// FundingBroadcastSafe events to allow tracking of which events correspond with which
 238         /// create_channel call. Note that user_channel_id defaults to 0 for inbound channels, so you
 239         /// may wish to avoid using 0 for user_id here.
 240         /// If successful, will generate a SendOpenChannel event, so you should probably poll
 241         /// PeerManager::process_events afterwards.
 242         pub fn create_channel(&self, their_network_key: PublicKey, channel_value_satoshis: u64, user_id: u64) -> Result<(), HandleError> {
 243                 let chan_keys = if cfg!(feature = "fuzztarget") {
 244                         ChannelKeys {
 245                                 funding_key:               SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
 246                                 revocation_base_key:       SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
 247                                 payment_base_key:          SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
 248                                 delayed_payment_base_key:  SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
 249                                 htlc_base_key:             SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
 250                                 channel_close_key:         SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
 251                                 channel_monitor_claim_key: SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
 252                                 commitment_seed: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
 253                         }
 254                 } else {
 255                         let mut key_seed = [0u8; 32];
 256                         rng::fill_bytes(&mut key_seed);
 257                         match ChannelKeys::new_from_seed(&key_seed) {
 258                                 Ok(key) => key,
 259                                 Err(_) => panic!("RNG is busted!")
 260                         }
 261                 };
 262
 263                 let channel = Channel::new_outbound(&*self.fee_estimator, chan_keys, their_network_key, channel_value_satoshis, self.announce_channels_publicly, user_id);
 264                 let res = channel.get_open_channel(self.genesis_hash.clone(), &*self.fee_estimator)?;
 265                 let mut channel_state = self.channel_state.lock().unwrap();
 266                 match channel_state.by_id.insert(channel.channel_id(), channel) {
 267                         Some(_) => panic!("RNG is bad???"),
 268                         None => {}
 269                 }
 270
 271                 let mut events = self.pending_events.lock().unwrap();
 272                 events.push(events::Event::SendOpenChannel {
 273                         node_id: their_network_key,
 274                         msg: res,
 275                 });
 276                 Ok(())
 277         }
 278
 279         /// Gets the list of open channels, in random order. See ChannelDetail field documentation for
 280         /// more information.
 281         pub fn list_channels(&self) -> Vec<ChannelDetails> {
 282                 let channel_state = self.channel_state.lock().unwrap();
 283                 let mut res = Vec::with_capacity(channel_state.by_id.len());
 284                 for (channel_id, channel) in channel_state.by_id.iter() {
 285                         res.push(ChannelDetails {
 286                                 channel_id: (*channel_id).clone(),
 287                                 short_channel_id: channel.get_short_channel_id(),
 288                                 remote_network_id: channel.get_their_node_id(),
 289                                 channel_value_satoshis: channel.get_value_satoshis(),
 290                                 user_id: channel.get_user_id(),
 291                         });
 292                 }
 293                 res
 294         }
 295
 296         /// Gets the list of usable channels, in random order. Useful as an argument to
 297         /// Router::get_route to ensure non-announced channels are used.
 298         pub fn list_usable_channels(&self) -> Vec<ChannelDetails> {
 299                 let channel_state = self.channel_state.lock().unwrap();
 300                 let mut res = Vec::with_capacity(channel_state.by_id.len());
 301                 for (channel_id, channel) in channel_state.by_id.iter() {
 302                         if channel.is_usable() {
 303                                 res.push(ChannelDetails {
 304                                         channel_id: (*channel_id).clone(),
 305                                         short_channel_id: channel.get_short_channel_id(),
 306                                         remote_network_id: channel.get_their_node_id(),
 307                                         channel_value_satoshis: channel.get_value_satoshis(),
 308                                         user_id: channel.get_user_id(),
 309                                 });
 310                         }
 311                 }
 312                 res
 313         }
 314
 315         /// Begins the process of closing a channel. After this call (plus some timeout), no new HTLCs
 316         /// will be accepted on the given channel, and after additional timeout/the closing of all
 317         /// pending HTLCs, the channel will be closed on chain.
 318         /// May generate a SendShutdown event on success, which should be relayed.
 319         pub fn close_channel(&self, channel_id: &[u8; 32]) -> Result<(), HandleError> {
 320                 let (res, node_id, chan_option) = {
 321                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 322                         let channel_state = channel_state_lock.borrow_parts();
 323                         match channel_state.by_id.entry(channel_id.clone()) {
 324                                 hash_map::Entry::Occupied(mut chan_entry) => {
 325                                         let res = chan_entry.get_mut().get_shutdown()?;
 326                                         if chan_entry.get().is_shutdown() {
 327                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
 328                                                         channel_state.short_to_id.remove(&short_id);
 329                                                 }
 330                                                 (res, chan_entry.get().get_their_node_id(), Some(chan_entry.remove_entry().1))
 331                                         } else { (res, chan_entry.get().get_their_node_id(), None) }
 332                                 },
 333                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "No such channel", action: None})
 334                         }
 335                 };
 336                 for payment_hash in res.1 {
 337                         // unknown_next_peer...I dunno who that is anymore....
 338                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
 339                 }
 340                 let chan_update = if let Some(chan) = chan_option {
 341                         if let Ok(update) = self.get_channel_update(&chan) {
 342                                 Some(update)
 343                         } else { None }
 344                 } else { None };
 345
 346                 let mut events = self.pending_events.lock().unwrap();
 347                 if let Some(update) = chan_update {
 348                         events.push(events::Event::BroadcastChannelUpdate {
 349                                 msg: update
 350                         });
 351                 }
 352                 events.push(events::Event::SendShutdown {
 353                         node_id,
 354                         msg: res.0
 355                 });
 356
 357                 Ok(())
 358         }
 359
 360         #[inline]
 361         fn gen_rho_mu_from_shared_secret(shared_secret: &SharedSecret) -> ([u8; 32], [u8; 32]) {
 362                 ({
 363                         let mut hmac = Hmac::new(Sha256::new(), &[0x72, 0x68, 0x6f]); // rho
 364                         hmac.input(&shared_secret[..]);
 365                         let mut res = [0; 32];
 366                         hmac.raw_result(&mut res);
 367                         res
 368                 },
 369                 {
 370                         let mut hmac = Hmac::new(Sha256::new(), &[0x6d, 0x75]); // mu
 371                         hmac.input(&shared_secret[..]);
 372                         let mut res = [0; 32];
 373                         hmac.raw_result(&mut res);
 374                         res
 375                 })
 376         }
 377
 378         #[inline]
 379         fn gen_um_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 380                 let mut hmac = Hmac::new(Sha256::new(), &[0x75, 0x6d]); // um
 381                 hmac.input(&shared_secret[..]);
 382                 let mut res = [0; 32];
 383                 hmac.raw_result(&mut res);
 384                 res
 385         }
 386
 387         #[inline]
 388         fn gen_ammag_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 389                 let mut hmac = Hmac::new(Sha256::new(), &[0x61, 0x6d, 0x6d, 0x61, 0x67]); // ammag
 390                 hmac.input(&shared_secret[..]);
 391                 let mut res = [0; 32];
 392                 hmac.raw_result(&mut res);
 393                 res
 394         }
 395
 396         // can only fail if an intermediary hop has an invalid public key or session_priv is invalid
 397         #[inline]
 398         fn construct_onion_keys_callback<FType: FnMut(SharedSecret, [u8; 32], PublicKey, &RouteHop)> (secp_ctx: &Secp256k1, route: &Route, session_priv: &SecretKey, mut callback: FType) -> Result<(), HandleError> {
 399                 let mut blinded_priv = session_priv.clone();
 400                 let mut blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 401                 let mut first_iteration = true;
 402
 403                 for hop in route.hops.iter() {
 404                         let shared_secret = SharedSecret::new(secp_ctx, &hop.pubkey, &blinded_priv);
 405
 406                         let mut sha = Sha256::new();
 407                         sha.input(&blinded_pub.serialize()[..]);
 408                         sha.input(&shared_secret[..]);
 409                         let mut blinding_factor = [0u8; 32];
 410                         sha.result(&mut blinding_factor);
 411
 412                         if first_iteration {
 413                                 blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 414                                 first_iteration = false;
 415                         }
 416                         let ephemeral_pubkey = blinded_pub;
 417
 418                         secp_call!(blinded_priv.mul_assign(secp_ctx, &secp_call!(SecretKey::from_slice(secp_ctx, &blinding_factor))));
 419                         blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 420
 421                         callback(shared_secret, blinding_factor, ephemeral_pubkey, hop);
 422                 }
 423
 424                 Ok(())
 425         }
 426
 427         // can only fail if an intermediary hop has an invalid public key or session_priv is invalid
 428         fn construct_onion_keys(secp_ctx: &Secp256k1, route: &Route, session_priv: &SecretKey) -> Result<Vec<OnionKeys>, HandleError> {
 429                 let mut res = Vec::with_capacity(route.hops.len());
 430
 431                 Self::construct_onion_keys_callback(secp_ctx, route, session_priv, |shared_secret, _blinding_factor, ephemeral_pubkey, _| {
 432                         let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
 433
 434                         res.push(OnionKeys {
 435                                 #[cfg(test)]
 436                                 shared_secret,
 437                                 #[cfg(test)]
 438                                 blinding_factor: _blinding_factor,
 439                                 ephemeral_pubkey,
 440                                 rho,
 441                                 mu,
 442                         });
 443                 })?;
 444
 445                 Ok(res)
 446         }
 447
 448         /// returns the hop data, as well as the first-hop value_msat and CLTV value we should send.
 449         fn build_onion_payloads(route: &Route) -> Result<(Vec<msgs::OnionHopData>, u64, u32), HandleError> {
 450                 let mut cur_value_msat = 0u64;
 451                 let mut cur_cltv = 0u32;
 452                 let mut last_short_channel_id = 0;
 453                 let mut res: Vec<msgs::OnionHopData> = Vec::with_capacity(route.hops.len());
 454                 internal_traits::test_no_dealloc::<msgs::OnionHopData>(None);
 455                 unsafe { res.set_len(route.hops.len()); }
 456
 457                 for (idx, hop) in route.hops.iter().enumerate().rev() {
 458                         // First hop gets special values so that it can check, on receipt, that everything is
 459                         // exactly as it should be (and the next hop isn't trying to probe to find out if we're
 460                         // the intended recipient).
 461                         let value_msat = if cur_value_msat == 0 { hop.fee_msat } else { cur_value_msat };
 462                         let cltv = if cur_cltv == 0 { hop.cltv_expiry_delta } else { cur_cltv };
 463                         res[idx] = msgs::OnionHopData {
 464                                 realm: 0,
 465                                 data: msgs::OnionRealm0HopData {
 466                                         short_channel_id: last_short_channel_id,
 467                                         amt_to_forward: value_msat,
 468                                         outgoing_cltv_value: cltv,
 469                                 },
 470                                 hmac: [0; 32],
 471                         };
 472                         cur_value_msat += hop.fee_msat;
 473                         if cur_value_msat >= 21000000 * 100000000 * 1000 {
 474                                 return Err(HandleError{err: "Channel fees overflowed?!", action: None});
 475                         }
 476                         cur_cltv += hop.cltv_expiry_delta as u32;
 477                         if cur_cltv >= 500000000 {
 478                                 return Err(HandleError{err: "Channel CLTV overflowed?!", action: None});
 479                         }
 480                         last_short_channel_id = hop.short_channel_id;
 481                 }
 482                 Ok((res, cur_value_msat, cur_cltv))
 483         }
 484
 485         #[inline]
 486         fn shift_arr_right(arr: &mut [u8; 20*65]) {
 487                 unsafe {
 488                         ptr::copy(arr[0..].as_ptr(), arr[65..].as_mut_ptr(), 19*65);
 489                 }
 490                 for i in 0..65 {
 491                         arr[i] = 0;
 492                 }
 493         }
 494
 495         #[inline]
 496         fn xor_bufs(dst: &mut[u8], src: &[u8]) {
 497                 assert_eq!(dst.len(), src.len());
 498
 499                 for i in 0..dst.len() {
 500                         dst[i] ^= src[i];
 501                 }
 502         }
 503
 504         const ZERO:[u8; 21*65] = [0; 21*65];
 505         fn construct_onion_packet(mut payloads: Vec<msgs::OnionHopData>, onion_keys: Vec<OnionKeys>, associated_data: Vec<u8>) -> Result<msgs::OnionPacket, HandleError> {
 506                 let mut buf = Vec::with_capacity(21*65);
 507                 buf.resize(21*65, 0);
 508
 509                 let filler = {
 510                         let iters = payloads.len() - 1;
 511                         let end_len = iters * 65;
 512                         let mut res = Vec::with_capacity(end_len);
 513                         res.resize(end_len, 0);
 514
 515                         for (i, keys) in onion_keys.iter().enumerate() {
 516                                 if i == payloads.len() - 1 { continue; }
 517                                 let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 518                                 chacha.process(&ChannelManager::ZERO, &mut buf); // We don't have a seek function :(
 519                                 ChannelManager::xor_bufs(&mut res[0..(i + 1)*65], &buf[(20 - i)*65..21*65]);
 520                         }
 521                         res
 522                 };
 523
 524                 let mut packet_data = [0; 20*65];
 525                 let mut hmac_res = [0; 32];
 526
 527                 for (i, (payload, keys)) in payloads.iter_mut().zip(onion_keys.iter()).rev().enumerate() {
 528                         ChannelManager::shift_arr_right(&mut packet_data);
 529                         payload.hmac = hmac_res;
 530                         packet_data[0..65].copy_from_slice(&payload.encode()[..]);
 531
 532                         let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 533                         chacha.process(&packet_data, &mut buf[0..20*65]);
 534                         packet_data[..].copy_from_slice(&buf[0..20*65]);
 535
 536                         if i == 0 {
 537                                 packet_data[20*65 - filler.len()..20*65].copy_from_slice(&filler[..]);
 538                         }
 539
 540                         let mut hmac = Hmac::new(Sha256::new(), &keys.mu);
 541                         hmac.input(&packet_data);
 542                         hmac.input(&associated_data[..]);
 543                         hmac.raw_result(&mut hmac_res);
 544                 }
 545
 546                 Ok(msgs::OnionPacket{
 547                         version: 0,
 548                         public_key: onion_keys.first().unwrap().ephemeral_pubkey,
 549                         hop_data: packet_data,
 550                         hmac: hmac_res,
 551                 })
 552         }
 553
 554         /// Encrypts a failure packet. raw_packet can either be a
 555         /// msgs::DecodedOnionErrorPacket.encode() result or a msgs::OnionErrorPacket.data element.
 556         fn encrypt_failure_packet(shared_secret: &SharedSecret, raw_packet: &[u8]) -> msgs::OnionErrorPacket {
 557                 let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
 558
 559                 let mut packet_crypted = Vec::with_capacity(raw_packet.len());
 560                 packet_crypted.resize(raw_packet.len(), 0);
 561                 let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
 562                 chacha.process(&raw_packet, &mut packet_crypted[..]);
 563                 msgs::OnionErrorPacket {
 564                         data: packet_crypted,
 565                 }
 566         }
 567
 568         fn build_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::DecodedOnionErrorPacket {
 569                 assert!(failure_data.len() <= 256 - 2);
 570
 571                 let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
 572
 573                 let failuremsg = {
 574                         let mut res = Vec::with_capacity(2 + failure_data.len());
 575                         res.push(((failure_type >> 8) & 0xff) as u8);
 576                         res.push(((failure_type >> 0) & 0xff) as u8);
 577                         res.extend_from_slice(&failure_data[..]);
 578                         res
 579                 };
 580                 let pad = {
 581                         let mut res = Vec::with_capacity(256 - 2 - failure_data.len());
 582                         res.resize(256 - 2 - failure_data.len(), 0);
 583                         res
 584                 };
 585                 let mut packet = msgs::DecodedOnionErrorPacket {
 586                         hmac: [0; 32],
 587                         failuremsg: failuremsg,
 588                         pad: pad,
 589                 };
 590
 591                 let mut hmac = Hmac::new(Sha256::new(), &um);
 592                 hmac.input(&packet.encode()[32..]);
 593                 hmac.raw_result(&mut packet.hmac);
 594
 595                 packet
 596         }
 597
 598         #[inline]
 599         fn build_first_hop_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::OnionErrorPacket {
 600                 let failure_packet = ChannelManager::build_failure_packet(shared_secret, failure_type, failure_data);
 601                 ChannelManager::encrypt_failure_packet(shared_secret, &failure_packet.encode()[..])
 602         }
 603
 604         /// only fails if the channel does not yet have an assigned short_id
 605         fn get_channel_update(&self, chan: &Channel) -> Result<msgs::ChannelUpdate, HandleError> {
 606                 let short_channel_id = match chan.get_short_channel_id() {
 607                         None => return Err(HandleError{err: "Channel not yet established", action: None}),
 608                         Some(id) => id,
 609                 };
 610
 611                 let were_node_one = PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).unwrap().serialize()[..] < chan.get_their_node_id().serialize()[..];
 612
 613                 let unsigned = msgs::UnsignedChannelUpdate {
 614                         chain_hash: self.genesis_hash,
 615                         short_channel_id: short_channel_id,
 616                         timestamp: chan.get_channel_update_count(),
 617                         flags: (!were_node_one) as u16 | ((!chan.is_live() as u16) << 1),
 618                         cltv_expiry_delta: CLTV_EXPIRY_DELTA,
 619                         htlc_minimum_msat: chan.get_our_htlc_minimum_msat(),
 620                         fee_base_msat: chan.get_our_fee_base_msat(&*self.fee_estimator),
 621                         fee_proportional_millionths: self.fee_proportional_millionths,
 622                 };
 623
 624                 let msg_hash = Sha256dHash::from_data(&unsigned.encode()[..]);
 625                 let sig = self.secp_ctx.sign(&Message::from_slice(&msg_hash[..]).unwrap(), &self.our_network_key).unwrap(); //TODO Can we unwrap here?
 626
 627                 Ok(msgs::ChannelUpdate {
 628                         signature: sig,
 629                         contents: unsigned
 630                 })
 631         }
 632
 633         /// Sends a payment along a given route.
 634         /// Value parameters are provided via the last hop in route, see documentation for RouteHop
 635         /// fields for more info.
 636         /// See-also docs on Channel::send_htlc_and_commit.
 637         /// May generate a SendHTLCs event on success, which should be relayed.
 638         pub fn send_payment(&self, route: Route, payment_hash: [u8; 32]) -> Result<(), HandleError> {
 639                 if route.hops.len() < 1 || route.hops.len() > 20 {
 640                         return Err(HandleError{err: "Route didn't go anywhere/had bogus size", action: None});
 641                 }
 642                 let our_node_id = self.get_our_node_id();
 643                 for (idx, hop) in route.hops.iter().enumerate() {
 644                         if idx != route.hops.len() - 1 && hop.pubkey == our_node_id {
 645                                 return Err(HandleError{err: "Route went through us but wasn't a simple rebalance loop to us", action: None});
 646                         }
 647                 }
 648
 649                 let session_priv = secp_call!(SecretKey::from_slice(&self.secp_ctx, &{
 650                         let mut session_key = [0; 32];
 651                         rng::fill_bytes(&mut session_key);
 652                         session_key
 653                 }));
 654
 655                 let associated_data = Vec::new(); //TODO: What to put here?
 656
 657                 let onion_keys = ChannelManager::construct_onion_keys(&self.secp_ctx, &route, &session_priv)?;
 658                 let (onion_payloads, htlc_msat, htlc_cltv) = ChannelManager::build_onion_payloads(&route)?;
 659                 let onion_packet = ChannelManager::construct_onion_packet(onion_payloads, onion_keys, associated_data)?;
 660
 661                 let (first_hop_node_id, (update_add, commitment_signed, chan_monitor)) = {
 662                         let mut channel_state = self.channel_state.lock().unwrap();
 663                         let id = match channel_state.short_to_id.get(&route.hops.first().unwrap().short_channel_id) {
 664                                 None => return Err(HandleError{err: "No channel available with first hop!", action: None}),
 665                                 Some(id) => id.clone()
 666                         };
 667                         let res = {
 668                                 let chan = channel_state.by_id.get_mut(&id).unwrap();
 669                                 if chan.get_their_node_id() != route.hops.first().unwrap().pubkey {
 670                                         return Err(HandleError{err: "Node ID mismatch on first hop!", action: None});
 671                                 }
 672                                 chan.send_htlc_and_commit(htlc_msat, payment_hash.clone(), htlc_cltv, onion_packet)?
 673                         };
 674
 675                         let first_hop_node_id = route.hops.first().unwrap().pubkey;
 676
 677                         if channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::OutboundRoute {
 678                                 route,
 679                                 session_priv,
 680                         }).is_some() {
 681                                 // TODO: We need to track these better, we're not generating these, so a
 682                                 // third-party might make this happen:
 683                                 panic!("payment_hash was repeated! Don't let this happen");
 684                         }
 685
 686                         match res {
 687                                 Some(msgs) => (first_hop_node_id, msgs),
 688                                 None => return Ok(()),
 689                         }
 690                 };
 691
 692                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 693                         unimplemented!(); // maybe remove from claimable_htlcs?
 694                 }
 695
 696                 let mut events = self.pending_events.lock().unwrap();
 697                 events.push(events::Event::SendHTLCs {
 698                         node_id: first_hop_node_id,
 699                         msgs: vec![update_add],
 700                         commitment_msg: commitment_signed,
 701                 });
 702                 Ok(())
 703         }
 704
 705         /// Call this upon creation of a funding transaction for the given channel.
 706         /// Panics if a funding transaction has already been provided for this channel.
 707         pub fn funding_transaction_generated(&self, temporary_channel_id: &[u8; 32], funding_txo: OutPoint) {
 708                 let (chan, msg, chan_monitor) = {
 709                         let mut channel_state = self.channel_state.lock().unwrap();
 710                         match channel_state.by_id.remove(temporary_channel_id) {
 711                                 Some(mut chan) => {
 712                                         match chan.get_outbound_funding_created(funding_txo) {
 713                                                 Ok(funding_msg) => {
 714                                                         (chan, funding_msg.0, funding_msg.1)
 715                                                 },
 716                                                 Err(_e) => {
 717                                                         //TODO: Push e to pendingevents
 718                                                         return;
 719                                                 }
 720                                         }
 721                                 },
 722                                 None => return
 723                         }
 724                 }; // Release channel lock for install_watch_outpoint call,
 725                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 726                         unimplemented!(); // maybe remove from claimable_htlcs?
 727                 }
 728                 {
 729                         let mut pending_events = self.pending_events.lock().unwrap();
 730                         pending_events.push(events::Event::SendFundingCreated {
 731                                 node_id: chan.get_their_node_id(),
 732                                 msg: msg,
 733                         });
 734                 }
 735
 736                 let mut channel_state = self.channel_state.lock().unwrap();
 737                 channel_state.by_id.insert(chan.channel_id(), chan);
 738         }
 739
 740         fn get_announcement_sigs(&self, chan: &Channel) -> Result<Option<msgs::AnnouncementSignatures>, HandleError> {
 741                 if !chan.is_usable() || !chan.should_announce() { return Ok(None) }
 742
 743                 let (announcement, our_bitcoin_sig) = chan.get_channel_announcement(self.get_our_node_id(), self.genesis_hash.clone())?;
 744                 let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
 745                 let our_node_sig = secp_call!(self.secp_ctx.sign(&msghash, &self.our_network_key));
 746
 747                 Ok(Some(msgs::AnnouncementSignatures {
 748                         channel_id: chan.channel_id(),
 749                         short_channel_id: chan.get_short_channel_id().unwrap(),
 750                         node_signature: our_node_sig,
 751                         bitcoin_signature: our_bitcoin_sig,
 752                 }))
 753         }
 754
 755         pub fn process_pending_htlc_forward(&self) {
 756                 let mut new_events = Vec::new();
 757                 let mut failed_forwards = Vec::new();
 758                 {
 759                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 760                         let channel_state = channel_state_lock.borrow_parts();
 761
 762                         if cfg!(not(feature = "fuzztarget")) && Instant::now() < *channel_state.next_forward {
 763                                 return;
 764                         }
 765
 766                         for (short_chan_id, pending_forwards) in channel_state.forward_htlcs.drain() {
 767                                 if short_chan_id != 0 {
 768                                         let forward_chan_id = match channel_state.short_to_id.get(&short_chan_id) {
 769                                                 Some(chan_id) => chan_id.clone(),
 770                                                 None => {
 771                                                         failed_forwards.reserve(pending_forwards.len());
 772                                                         for forward_info in pending_forwards {
 773                                                                 failed_forwards.push((forward_info.payment_hash, 0x4000 | 10, None));
 774                                                         }
 775                                                         continue;
 776                                                 }
 777                                         };
 778                                         let forward_chan = &mut channel_state.by_id.get_mut(&forward_chan_id).unwrap();
 779
 780                                         let mut add_htlc_msgs = Vec::new();
 781                                         for forward_info in pending_forwards {
 782                                                 match forward_chan.send_htlc(forward_info.amt_to_forward, forward_info.payment_hash, forward_info.outgoing_cltv_value, forward_info.onion_packet.unwrap()) {
 783                                                         Err(_e) => {
 784                                                                 let chan_update = self.get_channel_update(forward_chan).unwrap();
 785                                                                 failed_forwards.push((forward_info.payment_hash, 0x1000 | 7, Some(chan_update)));
 786                                                                 continue;
 787                                                         },
 788                                                         Ok(update_add) => {
 789                                                                 match update_add {
 790                                                                         Some(msg) => { add_htlc_msgs.push(msg); },
 791                                                                         None => {
 792                                                                                 // Nothing to do here...we're waiting on a remote
 793                                                                                 // revoke_and_ack before we can add anymore HTLCs. The Channel
 794                                                                                 // will automatically handle building the update_add_htlc and
 795                                                                                 // commitment_signed messages when we can.
 796                                                                                 // TODO: Do some kind of timer to set the channel as !is_live()
 797                                                                                 // as we don't really want others relying on us relaying through
 798                                                                                 // this channel currently :/.
 799                                                                         }
 800                                                                 }
 801                                                         }
 802                                                 }
 803                                         }
 804
 805                                         if !add_htlc_msgs.is_empty() {
 806                                                 let (commitment_msg, monitor) = match forward_chan.send_commitment() {
 807                                                         Ok(res) => res,
 808                                                         Err(_) => {
 809                                                                 //TODO: Handle...this is bad!
 810                                                                 continue;
 811                                                         },
 812                                                 };
 813                                                 new_events.push((Some(monitor), events::Event::SendHTLCs {
 814                                                         node_id: forward_chan.get_their_node_id(),
 815                                                         msgs: add_htlc_msgs,
 816                                                         commitment_msg: commitment_msg,
 817                                                 }));
 818                                         }
 819                                 } else {
 820                                         for forward_info in pending_forwards {
 821                                                 new_events.push((None, events::Event::PaymentReceived {
 822                                                         payment_hash: forward_info.payment_hash,
 823                                                         amt: forward_info.amt_to_forward,
 824                                                 }));
 825                                         }
 826                                 }
 827                         }
 828                 }
 829
 830                 for failed_forward in failed_forwards.drain(..) {
 831                         match failed_forward.2 {
 832                                 None => self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &failed_forward.0, HTLCFailReason::Reason { failure_code: failed_forward.1, data: Vec::new() }),
 833                                 Some(chan_update) => self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &failed_forward.0, HTLCFailReason::Reason { failure_code: failed_forward.1, data: chan_update.encode_with_len() }),
 834                         };
 835                 }
 836
 837                 if new_events.is_empty() { return }
 838
 839                 new_events.retain(|event| {
 840                         if let &Some(ref monitor) = &event.0 {
 841                                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor.clone()) {
 842                                         unimplemented!();// but def dont push the event...
 843                                 }
 844                         }
 845                         true
 846                 });
 847
 848                 let mut events = self.pending_events.lock().unwrap();
 849                 events.reserve(new_events.len());
 850                 for event in new_events.drain(..) {
 851                         events.push(event.1);
 852                 }
 853         }
 854
 855         /// Indicates that the preimage for payment_hash is unknown after a PaymentReceived event.
 856         pub fn fail_htlc_backwards(&self, payment_hash: &[u8; 32]) -> bool {
 857                 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 15, data: Vec::new() })
 858         }
 859
 860         fn fail_htlc_backwards_internal(&self, mut channel_state: MutexGuard<ChannelHolder>, payment_hash: &[u8; 32], onion_error: HTLCFailReason) -> bool {
 861                 let mut pending_htlc = {
 862                         match channel_state.claimable_htlcs.remove(payment_hash) {
 863                                 Some(pending_htlc) => pending_htlc,
 864                                 None => return false,
 865                         }
 866                 };
 867
 868                 match pending_htlc {
 869                         PendingOutboundHTLC::CycledRoute { source_short_channel_id, incoming_packet_shared_secret, route, session_priv } => {
 870                                 channel_state.claimable_htlcs.insert(payment_hash.clone(), PendingOutboundHTLC::OutboundRoute {
 871                                         route,
 872                                         session_priv,
 873                                 });
 874                                 pending_htlc = PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret };
 875                         },
 876                         _ => {}
 877                 }
 878
 879                 match pending_htlc {
 880                         PendingOutboundHTLC::CycledRoute { .. } => { panic!("WAT"); },
 881                         PendingOutboundHTLC::OutboundRoute { .. } => {
 882                                 mem::drop(channel_state);
 883
 884                                 let mut pending_events = self.pending_events.lock().unwrap();
 885                                 pending_events.push(events::Event::PaymentFailed {
 886                                         payment_hash: payment_hash.clone()
 887                                 });
 888                                 false
 889                         },
 890                         PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret } => {
 891                                 let err_packet = match onion_error {
 892                                         HTLCFailReason::Reason { failure_code, data } => {
 893                                                 let packet = ChannelManager::build_failure_packet(&incoming_packet_shared_secret, failure_code, &data[..]).encode();
 894                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &packet)
 895                                         },
 896                                         HTLCFailReason::ErrorPacket { err } => {
 897                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &err.data)
 898                                         }
 899                                 };
 900
 901                                 let (node_id, fail_msgs) = {
 902                                         let chan_id = match channel_state.short_to_id.get(&source_short_channel_id) {
 903                                                 Some(chan_id) => chan_id.clone(),
 904                                                 None => return false
 905                                         };
 906
 907                                         let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
 908                                         match chan.get_update_fail_htlc_and_commit(payment_hash, err_packet) {
 909                                                 Ok(msg) => (chan.get_their_node_id(), msg),
 910                                                 Err(_e) => {
 911                                                         //TODO: Do something with e?
 912                                                         return false;
 913                                                 },
 914                                         }
 915                                 };
 916
 917                                 match fail_msgs {
 918                                         Some((msg, commitment_msg, chan_monitor)) => {
 919                                                 mem::drop(channel_state);
 920
 921                                                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 922                                                         unimplemented!();// but def dont push the event...
 923                                                 }
 924
 925                                                 let mut pending_events = self.pending_events.lock().unwrap();
 926                                                 pending_events.push(events::Event::SendFailHTLC {
 927                                                         node_id,
 928                                                         msg: msg,
 929                                                         commitment_msg: commitment_msg,
 930                                                 });
 931                                         },
 932                                         None => {},
 933                                 }
 934
 935                                 true
 936                         },
 937                 }
 938         }
 939
 940         /// Provides a payment preimage in response to a PaymentReceived event, returning true and
 941         /// generating message events for the net layer to claim the payment, if possible. Thus, you
 942         /// should probably kick the net layer to go send messages if this returns true!
 943         /// May panic if called except in response to a PaymentReceived event.
 944         pub fn claim_funds(&self, payment_preimage: [u8; 32]) -> bool {
 945                 self.claim_funds_internal(payment_preimage, true)
 946         }
 947         pub fn claim_funds_internal(&self, payment_preimage: [u8; 32], from_user: bool) -> bool {
 948                 let mut sha = Sha256::new();
 949                 sha.input(&payment_preimage);
 950                 let mut payment_hash = [0; 32];
 951                 sha.result(&mut payment_hash);
 952
 953                 let mut channel_state = self.channel_state.lock().unwrap();
 954                 let mut pending_htlc = {
 955                         match channel_state.claimable_htlcs.remove(&payment_hash) {
 956                                 Some(pending_htlc) => pending_htlc,
 957                                 None => return false,
 958                         }
 959                 };
 960
 961                 match pending_htlc {
 962                         PendingOutboundHTLC::CycledRoute { source_short_channel_id, incoming_packet_shared_secret, route, session_priv } => {
 963                                 if from_user { // This was the end hop back to us
 964                                         pending_htlc = PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret };
 965                                         channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::OutboundRoute { route, session_priv });
 966                                 } else { // This came from the first upstream node
 967                                         // Bank error in our favor! Maybe we should tell the user this somehow???
 968                                         pending_htlc = PendingOutboundHTLC::OutboundRoute { route, session_priv };
 969                                         channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret });
 970                                 }
 971                         },
 972                         _ => {},
 973                 }
 974
 975                 match pending_htlc {
 976                         PendingOutboundHTLC::CycledRoute { .. } => { panic!("WAT"); },
 977                         PendingOutboundHTLC::OutboundRoute { .. } => {
 978                                 if from_user {
 979                                         panic!("Called claim_funds with a preimage for an outgoing payment. There is nothing we can do with this, and something is seriously wrong if you knew this...");
 980                                 }
 981                                 mem::drop(channel_state);
 982                                 let mut pending_events = self.pending_events.lock().unwrap();
 983                                 pending_events.push(events::Event::PaymentSent {
 984                                         payment_preimage
 985                                 });
 986                                 false
 987                         },
 988                         PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, .. } => {
 989                                 let (node_id, fulfill_msgs) = {
 990                                         let chan_id = match channel_state.short_to_id.get(&source_short_channel_id) {
 991                                                 Some(chan_id) => chan_id.clone(),
 992                                                 None => return false
 993                                         };
 994
 995                                         let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
 996                                         match chan.get_update_fulfill_htlc_and_commit(payment_preimage) {
 997                                                 Ok(msg) => (chan.get_their_node_id(), msg),
 998                                                 Err(_e) => {
 999                                                         //TODO: Do something with e?
1000                                                         return false;
1001                                                 },
1002                                         }
1003                                 };
1004
1005                                 mem::drop(channel_state);
1006                                 match fulfill_msgs {
1007                                         Some((msg, commitment_msg, chan_monitor)) => {
1008                                                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1009                                                         unimplemented!();// but def dont push the event...
1010                                                 }
1011
1012                                                 let mut pending_events = self.pending_events.lock().unwrap();
1013                                                 pending_events.push(events::Event::SendFulfillHTLC {
1014                                                         node_id: node_id,
1015                                                         msg,
1016                                                         commitment_msg,
1017                                                 });
1018                                         },
1019                                         None => {},
1020                                 }
1021                                 true
1022                         },
1023                 }
1024         }
1025
1026         /// Gets the node_id held by this ChannelManager
1027         pub fn get_our_node_id(&self) -> PublicKey {
1028                 PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).unwrap()
1029         }
1030
1031         /// Used to restore channels to normal operation after a
1032         /// ChannelMonitorUpdateErr::TemporaryFailure was returned from a channel monitor update
1033         /// operation.
1034         pub fn test_restore_channel_monitor(&self) {
1035                 unimplemented!();
1036         }
1037 }
1038
1039 impl events::EventsProvider for ChannelManager {
1040         fn get_and_clear_pending_events(&self) -> Vec<events::Event> {
1041                 let mut pending_events = self.pending_events.lock().unwrap();
1042                 let mut ret = Vec::new();
1043                 mem::swap(&mut ret, &mut *pending_events);
1044                 ret
1045         }
1046 }
1047
1048 impl ChainListener for ChannelManager {
1049         fn block_connected(&self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) {
1050                 let mut new_events = Vec::new();
1051                 {
1052                         let mut channel_state = self.channel_state.lock().unwrap();
1053                         let mut short_to_ids_to_insert = Vec::new();
1054                         let mut short_to_ids_to_remove = Vec::new();
1055                         channel_state.by_id.retain(|_, channel| {
1056                                 if let Some(funding_locked) = channel.block_connected(header, height, txn_matched, indexes_of_txn_matched) {
1057                                         let announcement_sigs = match self.get_announcement_sigs(channel) {
1058                                                 Ok(res) => res,
1059                                                 Err(_e) => {
1060                                                         //TODO: push e on events and blow up the channel (it has bad keys)
1061                                                         return true;
1062                                                 }
1063                                         };
1064                                         new_events.push(events::Event::SendFundingLocked {
1065                                                 node_id: channel.get_their_node_id(),
1066                                                 msg: funding_locked,
1067                                                 announcement_sigs: announcement_sigs
1068                                         });
1069                                         short_to_ids_to_insert.push((channel.get_short_channel_id().unwrap(), channel.channel_id()));
1070                                 }
1071                                 if let Some(funding_txo) = channel.get_funding_txo() {
1072                                         for tx in txn_matched {
1073                                                 for inp in tx.input.iter() {
1074                                                         if inp.prev_hash == funding_txo.txid && inp.prev_index == funding_txo.index as u32 {
1075                                                                 if let Some(short_id) = channel.get_short_channel_id() {
1076                                                                         short_to_ids_to_remove.push(short_id);
1077                                                                 }
1078                                                                 channel.force_shutdown();
1079                                                                 if let Ok(update) = self.get_channel_update(&channel) {
1080                                                                         new_events.push(events::Event::BroadcastChannelUpdate {
1081                                                                                 msg: update
1082                                                                         });
1083                                                                 }
1084                                                                 return false;
1085                                                         }
1086                                                 }
1087                                         }
1088                                 }
1089                                 if channel.channel_monitor().would_broadcast_at_height(height) {
1090                                         if let Some(short_id) = channel.get_short_channel_id() {
1091                                                 short_to_ids_to_remove.push(short_id);
1092                                         }
1093                                         channel.force_shutdown();
1094                                         if let Ok(update) = self.get_channel_update(&channel) {
1095                                                 new_events.push(events::Event::BroadcastChannelUpdate {
1096                                                         msg: update
1097                                                 });
1098                                         }
1099                                         return false;
1100                                 }
1101                                 true
1102                         });
1103                         for to_remove in short_to_ids_to_remove {
1104                                 channel_state.short_to_id.remove(&to_remove);
1105                         }
1106                         for to_insert in short_to_ids_to_insert {
1107                                 channel_state.short_to_id.insert(to_insert.0, to_insert.1);
1108                         }
1109                 }
1110                 let mut pending_events = self.pending_events.lock().unwrap();
1111                 for funding_locked in new_events.drain(..) {
1112                         pending_events.push(funding_locked);
1113                 }
1114         }
1115
1116         /// We force-close the channel without letting our counterparty participate in the shutdown
1117         fn block_disconnected(&self, header: &BlockHeader) {
1118                 let mut channel_lock = self.channel_state.lock().unwrap();
1119                 let channel_state = channel_lock.borrow_parts();
1120                 let short_to_id = channel_state.short_to_id;
1121                 channel_state.by_id.retain(|_,  v| {
1122                         if v.block_disconnected(header) {
1123                                 let tx = v.force_shutdown();
1124                                 for broadcast_tx in tx {
1125                                         self.tx_broadcaster.broadcast_transaction(&broadcast_tx);
1126                                 }
1127                                 if let Some(short_id) = v.get_short_channel_id() {
1128                                         short_to_id.remove(&short_id);
1129                                 }
1130                                 false
1131                         } else {
1132                                 true
1133                         }
1134                 });
1135         }
1136 }
1137
1138 impl ChannelMessageHandler for ChannelManager {
1139         //TODO: Handle errors and close channel (or so)
1140         fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &msgs::OpenChannel) -> Result<msgs::AcceptChannel, HandleError> {
1141                 if msg.chain_hash != self.genesis_hash {
1142                         return Err(HandleError{err: "Unknown genesis block hash", action: None});
1143                 }
1144                 let mut channel_state = self.channel_state.lock().unwrap();
1145                 if channel_state.by_id.contains_key(&msg.temporary_channel_id) {
1146                         return Err(HandleError{err: "temporary_channel_id collision!", action: None});
1147                 }
1148
1149                 let chan_keys = if cfg!(feature = "fuzztarget") {
1150                         ChannelKeys {
1151                                 funding_key:               SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
1152                                 revocation_base_key:       SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
1153                                 payment_base_key:          SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
1154                                 delayed_payment_base_key:  SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
1155                                 htlc_base_key:             SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
1156                                 channel_close_key:         SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
1157                                 channel_monitor_claim_key: SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
1158                                 commitment_seed: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
1159                         }
1160                 } else {
1161                         let mut key_seed = [0u8; 32];
1162                         rng::fill_bytes(&mut key_seed);
1163                         match ChannelKeys::new_from_seed(&key_seed) {
1164                                 Ok(key) => key,
1165                                 Err(_) => panic!("RNG is busted!")
1166                         }
1167                 };
1168
1169                 let channel = Channel::new_from_req(&*self.fee_estimator, chan_keys, their_node_id.clone(), msg, 0, self.announce_channels_publicly)?;
1170                 let accept_msg = channel.get_accept_channel()?;
1171                 channel_state.by_id.insert(channel.channel_id(), channel);
1172                 Ok(accept_msg)
1173         }
1174
1175         fn handle_accept_channel(&self, their_node_id: &PublicKey, msg: &msgs::AcceptChannel) -> Result<(), HandleError> {
1176                 let (value, output_script, user_id) = {
1177                         let mut channel_state = self.channel_state.lock().unwrap();
1178                         match channel_state.by_id.get_mut(&msg.temporary_channel_id) {
1179                                 Some(chan) => {
1180                                         if chan.get_their_node_id() != *their_node_id {
1181                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1182                                         }
1183                                         chan.accept_channel(&msg)?;
1184                                         (chan.get_value_satoshis(), chan.get_funding_redeemscript().to_v0_p2wsh(), chan.get_user_id())
1185                                 },
1186                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1187                         }
1188                 };
1189                 let mut pending_events = self.pending_events.lock().unwrap();
1190                 pending_events.push(events::Event::FundingGenerationReady {
1191                         temporary_channel_id: msg.temporary_channel_id,
1192                         channel_value_satoshis: value,
1193                         output_script: output_script,
1194                         user_channel_id: user_id,
1195                 });
1196                 Ok(())
1197         }
1198
1199         fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) -> Result<msgs::FundingSigned, HandleError> {
1200                 //TODO: broke this - a node shouldn't be able to get their channel removed by sending a
1201                 //funding_created a second time, or long after the first, or whatever (note this also
1202                 //leaves the short_to_id map in a busted state.
1203                 let (chan, funding_msg, monitor_update) = {
1204                         let mut channel_state = self.channel_state.lock().unwrap();
1205                         match channel_state.by_id.remove(&msg.temporary_channel_id) {
1206                                 Some(mut chan) => {
1207                                         if chan.get_their_node_id() != *their_node_id {
1208                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1209                                         }
1210                                         match chan.funding_created(msg) {
1211                                                 Ok((funding_msg, monitor_update)) => {
1212                                                         (chan, funding_msg, monitor_update)
1213                                                 },
1214                                                 Err(e) => {
1215                                                         return Err(e);
1216                                                 }
1217                                         }
1218                                 },
1219                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1220                         }
1221                 }; // Release channel lock for install_watch_outpoint call,
1222                    // note that this means if the remote end is misbehaving and sends a message for the same
1223                    // channel back-to-back with funding_created, we'll end up thinking they sent a message
1224                    // for a bogus channel.
1225                 if let Err(_e) = self.monitor.add_update_monitor(monitor_update.get_funding_txo().unwrap(), monitor_update) {
1226                         unimplemented!();
1227                 }
1228                 let mut channel_state = self.channel_state.lock().unwrap();
1229                 channel_state.by_id.insert(funding_msg.channel_id, chan);
1230                 Ok(funding_msg)
1231         }
1232
1233         fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) -> Result<(), HandleError> {
1234                 let (funding_txo, user_id, monitor) = {
1235                         let mut channel_state = self.channel_state.lock().unwrap();
1236                         match channel_state.by_id.get_mut(&msg.channel_id) {
1237                                 Some(chan) => {
1238                                         if chan.get_their_node_id() != *their_node_id {
1239                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1240                                         }
1241                                         let chan_monitor = chan.funding_signed(&msg)?;
1242                                         (chan.get_funding_txo().unwrap(), chan.get_user_id(), chan_monitor)
1243                                 },
1244                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1245                         }
1246                 };
1247                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor) {
1248                         unimplemented!();
1249                 }
1250                 let mut pending_events = self.pending_events.lock().unwrap();
1251                 pending_events.push(events::Event::FundingBroadcastSafe {
1252                         funding_txo: funding_txo,
1253                         user_channel_id: user_id,
1254                 });
1255                 Ok(())
1256         }
1257
1258         fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &msgs::FundingLocked) -> Result<Option<msgs::AnnouncementSignatures>, HandleError> {
1259                 let mut channel_state = self.channel_state.lock().unwrap();
1260                 match channel_state.by_id.get_mut(&msg.channel_id) {
1261                         Some(chan) => {
1262                                 if chan.get_their_node_id() != *their_node_id {
1263                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1264                                 }
1265                                 chan.funding_locked(&msg)?;
1266                                 return Ok(self.get_announcement_sigs(chan)?);
1267                         },
1268                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1269                 };
1270         }
1271
1272         fn handle_shutdown(&self, their_node_id: &PublicKey, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>), HandleError> {
1273                 let (res, chan_option) = {
1274                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1275                         let channel_state = channel_state_lock.borrow_parts();
1276
1277                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1278                                 hash_map::Entry::Occupied(mut chan_entry) => {
1279                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1280                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1281                                         }
1282                                         let res = chan_entry.get_mut().shutdown(&*self.fee_estimator, &msg)?;
1283                                         if chan_entry.get().is_shutdown() {
1284                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
1285                                                         channel_state.short_to_id.remove(&short_id);
1286                                                 }
1287                                                 (res, Some(chan_entry.remove_entry().1))
1288                                         } else { (res, None) }
1289                                 },
1290                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1291                         }
1292                 };
1293                 for payment_hash in res.2 {
1294                         // unknown_next_peer...I dunno who that is anymore....
1295                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
1296                 }
1297                 if let Some(chan) = chan_option {
1298                         if let Ok(update) = self.get_channel_update(&chan) {
1299                                 let mut events = self.pending_events.lock().unwrap();
1300                                 events.push(events::Event::BroadcastChannelUpdate {
1301                                         msg: update
1302                                 });
1303                         }
1304                 }
1305                 Ok((res.0, res.1))
1306         }
1307
1308         fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &msgs::ClosingSigned) -> Result<Option<msgs::ClosingSigned>, HandleError> {
1309                 let (res, chan_option) = {
1310                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1311                         let channel_state = channel_state_lock.borrow_parts();
1312                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1313                                 hash_map::Entry::Occupied(mut chan_entry) => {
1314                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1315                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1316                                         }
1317                                         let res = chan_entry.get_mut().closing_signed(&*self.fee_estimator, &msg)?;
1318                                         if res.1.is_some() {
1319                                                 // We're done with this channel, we've got a signed closing transaction and
1320                                                 // will send the closing_signed back to the remote peer upon return. This
1321                                                 // also implies there are no pending HTLCs left on the channel, so we can
1322                                                 // fully delete it from tracking (the channel monitor is still around to
1323                                                 // watch for old state broadcasts)!
1324                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
1325                                                         channel_state.short_to_id.remove(&short_id);
1326                                                 }
1327                                                 (res, Some(chan_entry.remove_entry().1))
1328                                         } else { (res, None) }
1329                                 },
1330                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1331                         }
1332                 };
1333                 if let Some(broadcast_tx) = res.1 {
1334                         self.tx_broadcaster.broadcast_transaction(&broadcast_tx);
1335                 }
1336                 if let Some(chan) = chan_option {
1337                         if let Ok(update) = self.get_channel_update(&chan) {
1338                                 let mut events = self.pending_events.lock().unwrap();
1339                                 events.push(events::Event::BroadcastChannelUpdate {
1340                                         msg: update
1341                                 });
1342                         }
1343                 }
1344                 Ok(res.0)
1345         }
1346
1347         fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) -> Result<(), msgs::HandleError> {
1348                 //TODO: BOLT 4 points out a specific attack where a peer may re-send an onion packet and
1349                 //determine the state of the payment based on our response/if we forward anything/the time
1350                 //we take to respond. We should take care to avoid allowing such an attack.
1351                 //
1352                 //TODO: There exists a further attack where a node may garble the onion data, forward it to
1353                 //us repeatedly garbled in different ways, and compare our error messages, which are
1354                 //encrypted with the same key. Its not immediately obvious how to usefully exploit that,
1355                 //but we should prevent it anyway.
1356
1357                 let shared_secret = SharedSecret::new(&self.secp_ctx, &msg.onion_routing_packet.public_key, &self.our_network_key);
1358                 let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
1359
1360                 let associated_data = Vec::new(); //TODO: What to put here?
1361
1362                 macro_rules! get_onion_hash {
1363                         () => {
1364                                 {
1365                                         let mut sha = Sha256::new();
1366                                         sha.input(&msg.onion_routing_packet.hop_data);
1367                                         let mut onion_hash = [0; 32];
1368                                         sha.result(&mut onion_hash);
1369                                         onion_hash
1370                                 }
1371                         }
1372                 }
1373
1374                 macro_rules! return_err {
1375                         ($msg: expr, $err_code: expr, $data: expr) => {
1376                                 return Err(msgs::HandleError {
1377                                         err: $msg,
1378                                         action: Some(msgs::ErrorAction::UpdateFailHTLC {
1379                                                 msg: msgs::UpdateFailHTLC {
1380                                                         channel_id: msg.channel_id,
1381                                                         htlc_id: msg.htlc_id,
1382                                                         reason: ChannelManager::build_first_hop_failure_packet(&shared_secret, $err_code, $data),
1383                                                 }
1384                                         }),
1385                                 });
1386                         }
1387                 }
1388
1389                 if msg.onion_routing_packet.version != 0 {
1390                         //TODO: Spec doesn't indicate if we should only hash hop_data here (and in other
1391                         //sha256_of_onion error data packets), or the entire onion_routing_packet. Either way,
1392                         //the hash doesn't really serve any purpuse - in the case of hashing all data, the
1393                         //receiving node would have to brute force to figure out which version was put in the
1394                         //packet by the node that send us the message, in the case of hashing the hop_data, the
1395                         //node knows the HMAC matched, so they already know what is there...
1396                         return_err!("Unknown onion packet version", 0x8000 | 0x4000 | 4, &get_onion_hash!());
1397                 }
1398
1399                 let mut hmac = Hmac::new(Sha256::new(), &mu);
1400                 hmac.input(&msg.onion_routing_packet.hop_data);
1401                 hmac.input(&associated_data[..]);
1402                 if hmac.result() != MacResult::new(&msg.onion_routing_packet.hmac) {
1403                         return_err!("HMAC Check failed", 0x8000 | 0x4000 | 5, &get_onion_hash!());
1404                 }
1405
1406                 let mut chacha = ChaCha20::new(&rho, &[0u8; 8]);
1407                 let next_hop_data = {
1408                         let mut decoded = [0; 65];
1409                         chacha.process(&msg.onion_routing_packet.hop_data[0..65], &mut decoded);
1410                         match msgs::OnionHopData::decode(&decoded[..]) {
1411                                 Err(err) => {
1412                                         let error_code = match err {
1413                                                 msgs::DecodeError::UnknownRealmByte => 0x4000 | 1,
1414                                                 _ => 0x2000 | 2, // Should never happen
1415                                         };
1416                                         return_err!("Unable to decode our hop data", error_code, &[0;0]);
1417                                 },
1418                                 Ok(msg) => msg
1419                         }
1420                 };
1421
1422                 let mut pending_forward_info = if next_hop_data.hmac == [0; 32] {
1423                                 // OUR PAYMENT!
1424                                 if next_hop_data.data.amt_to_forward != msg.amount_msat {
1425                                         return_err!("Upstream node sent less than we were supposed to receive in payment", 19, &byte_utils::be64_to_array(msg.amount_msat));
1426                                 }
1427                                 if next_hop_data.data.outgoing_cltv_value != msg.cltv_expiry {
1428                                         return_err!("Upstream node set CLTV to the wrong value", 18, &byte_utils::be32_to_array(msg.cltv_expiry));
1429                                 }
1430
1431                                 // Note that we could obviously respond immediately with an update_fulfill_htlc
1432                                 // message, however that would leak that we are the recipient of this payment, so
1433                                 // instead we stay symmetric with the forwarding case, only responding (after a
1434                                 // delay) once they've send us a commitment_signed!
1435
1436                                 PendingForwardHTLCInfo {
1437                                         onion_packet: None,
1438                                         payment_hash: msg.payment_hash.clone(),
1439                                         short_channel_id: 0,
1440                                         prev_short_channel_id: 0,
1441                                         amt_to_forward: next_hop_data.data.amt_to_forward,
1442                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
1443                                 }
1444                         } else {
1445                                 let mut new_packet_data = [0; 20*65];
1446                                 chacha.process(&msg.onion_routing_packet.hop_data[65..], &mut new_packet_data[0..19*65]);
1447                                 chacha.process(&ChannelManager::ZERO[0..65], &mut new_packet_data[19*65..]);
1448
1449                                 let mut new_pubkey = msg.onion_routing_packet.public_key.clone();
1450
1451                                 let blinding_factor = {
1452                                         let mut sha = Sha256::new();
1453                                         sha.input(&new_pubkey.serialize()[..]);
1454                                         sha.input(&shared_secret[..]);
1455                                         let mut res = [0u8; 32];
1456                                         sha.result(&mut res);
1457                                         match SecretKey::from_slice(&self.secp_ctx, &res) {
1458                                                 Err(_) => {
1459                                                         // Return temporary node failure as its technically our issue, not the
1460                                                         // channel's issue.
1461                                                         return_err!("Blinding factor is an invalid private key", 0x2000 | 2, &[0;0]);
1462                                                 },
1463                                                 Ok(key) => key
1464                                         }
1465                                 };
1466
1467                                 match new_pubkey.mul_assign(&self.secp_ctx, &blinding_factor) {
1468                                         Err(_) => {
1469                                                 // Return temporary node failure as its technically our issue, not the
1470                                                 // channel's issue.
1471                                                 return_err!("New blinding factor is an invalid private key", 0x2000 | 2, &[0;0]);
1472                                         },
1473                                         Ok(_) => {}
1474                                 };
1475
1476                                 let outgoing_packet = msgs::OnionPacket {
1477                                         version: 0,
1478                                         public_key: new_pubkey,
1479                                         hop_data: new_packet_data,
1480                                         hmac: next_hop_data.hmac.clone(),
1481                                 };
1482
1483                                 //TODO: Check amt_to_forward and outgoing_cltv_value are within acceptable ranges!
1484
1485                                 PendingForwardHTLCInfo {
1486                                         onion_packet: Some(outgoing_packet),
1487                                         payment_hash: msg.payment_hash.clone(),
1488                                         short_channel_id: next_hop_data.data.short_channel_id,
1489                                         prev_short_channel_id: 0,
1490                                         amt_to_forward: next_hop_data.data.amt_to_forward,
1491                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
1492                                 }
1493                         };
1494
1495                 let mut channel_state_lock = self.channel_state.lock().unwrap();
1496                 let channel_state = channel_state_lock.borrow_parts();
1497
1498                 if pending_forward_info.onion_packet.is_some() { // If short_channel_id is 0 here, we'll reject them in the body here
1499                         let forwarding_id = match channel_state.short_to_id.get(&pending_forward_info.short_channel_id) {
1500                                 None => {
1501                                         return_err!("Don't have available channel for forwarding as requested.", 0x4000 | 10, &[0;0]);
1502                                 },
1503                                 Some(id) => id.clone(),
1504                         };
1505                         let chan = channel_state.by_id.get_mut(&forwarding_id).unwrap();
1506                         if !chan.is_live() {
1507                                 let chan_update = self.get_channel_update(chan).unwrap();
1508                                 return_err!("Forwarding channel is not in a ready state.", 0x1000 | 7, &chan_update.encode_with_len()[..]);
1509                         }
1510                 }
1511
1512                 let claimable_htlcs_entry = channel_state.claimable_htlcs.entry(msg.payment_hash.clone());
1513
1514                 // We dont correctly handle payments that route through us twice on their way to their
1515                 // destination. That's OK since those nodes are probably busted or trying to do network
1516                 // mapping through repeated loops. In either case, we want them to stop talking to us, so
1517                 // we send permanent_node_failure.
1518                 match &claimable_htlcs_entry {
1519                         &hash_map::Entry::Occupied(ref e) => {
1520                                 let mut acceptable_cycle = false;
1521                                 match e.get() {
1522                                         &PendingOutboundHTLC::OutboundRoute { .. } => {
1523                                                 acceptable_cycle = pending_forward_info.short_channel_id == 0;
1524                                         },
1525                                         _ => {},
1526                                 }
1527                                 if !acceptable_cycle {
1528                                         return_err!("Payment looped through us twice", 0x4000 | 0x2000 | 2, &[0;0]);
1529                                 }
1530                         },
1531                         _ => {},
1532                 }
1533
1534                 let (source_short_channel_id, res) = match channel_state.by_id.get_mut(&msg.channel_id) {
1535                         Some(chan) => {
1536                                 if chan.get_their_node_id() != *their_node_id {
1537                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1538                                 }
1539                                 if !chan.is_usable() {
1540                                         return Err(HandleError{err: "Channel not yet available for receiving HTLCs", action: None});
1541                                 }
1542                                 let short_channel_id = chan.get_short_channel_id().unwrap();
1543                                 pending_forward_info.prev_short_channel_id = short_channel_id;
1544                                 (short_channel_id, chan.update_add_htlc(&msg, pending_forward_info)?)
1545                         },
1546                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None}), //TODO: panic?
1547                 };
1548
1549                 match claimable_htlcs_entry {
1550                         hash_map::Entry::Occupied(mut e) => {
1551                                 let outbound_route = e.get_mut();
1552                                 let (route, session_priv) = match outbound_route {
1553                                         &mut PendingOutboundHTLC::OutboundRoute { ref route, ref session_priv } => {
1554                                                 (route.clone(), session_priv.clone())
1555                                         },
1556                                         _ => { panic!("WAT") },
1557                                 };
1558                                 *outbound_route = PendingOutboundHTLC::CycledRoute {
1559                                         source_short_channel_id,
1560                                         incoming_packet_shared_secret: shared_secret,
1561                                         route,
1562                                         session_priv,
1563                                 };
1564                         },
1565                         hash_map::Entry::Vacant(e) => {
1566                                 e.insert(PendingOutboundHTLC::IntermediaryHopData {
1567                                         source_short_channel_id,
1568                                         incoming_packet_shared_secret: shared_secret,
1569                                 });
1570                         }
1571                 }
1572
1573                 Ok(res)
1574         }
1575
1576         fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) -> Result<(), HandleError> {
1577                 //TODO: Delay the claimed_funds relaying just like we do outbound relay!
1578                 // Claim funds first, cause we don't really care if the channel we received the message on
1579                 // is broken, we may have enough info to get our own money!
1580                 self.claim_funds_internal(msg.payment_preimage.clone(), false);
1581
1582                 let monitor = {
1583                         let mut channel_state = self.channel_state.lock().unwrap();
1584                         match channel_state.by_id.get_mut(&msg.channel_id) {
1585                                 Some(chan) => {
1586                                         if chan.get_their_node_id() != *their_node_id {
1587                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1588                                         }
1589                                         chan.update_fulfill_htlc(&msg)?
1590                                 },
1591                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1592                         }
1593                 };
1594                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor) {
1595                         unimplemented!();
1596                 }
1597                 Ok(())
1598         }
1599
1600         fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) -> Result<Option<msgs::HTLCFailChannelUpdate>, HandleError> {
1601                 let mut channel_state = self.channel_state.lock().unwrap();
1602                 let payment_hash = match channel_state.by_id.get_mut(&msg.channel_id) {
1603                         Some(chan) => {
1604                                 if chan.get_their_node_id() != *their_node_id {
1605                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1606                                 }
1607                                 chan.update_fail_htlc(&msg, HTLCFailReason::ErrorPacket { err: msg.reason.clone() })
1608                         },
1609                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1610                 }?;
1611
1612                 if let Some(pending_htlc) = channel_state.claimable_htlcs.get(&payment_hash) {
1613                         match pending_htlc {
1614                                 &PendingOutboundHTLC::OutboundRoute { ref route, ref session_priv } => {
1615                                         // Handle packed channel/node updates for passing back for the route handler
1616                                         let mut packet_decrypted = msg.reason.data.clone();
1617                                         let mut res = None;
1618                                         Self::construct_onion_keys_callback(&self.secp_ctx, &route, &session_priv, |shared_secret, _, _, route_hop| {
1619                                                 if res.is_some() { return; }
1620
1621                                                 let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
1622
1623                                                 let mut decryption_tmp = Vec::with_capacity(packet_decrypted.len());
1624                                                 decryption_tmp.resize(packet_decrypted.len(), 0);
1625                                                 let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
1626                                                 chacha.process(&packet_decrypted, &mut decryption_tmp[..]);
1627                                                 packet_decrypted = decryption_tmp;
1628
1629                                                 if let Ok(err_packet) = msgs::DecodedOnionErrorPacket::decode(&packet_decrypted) {
1630                                                         if err_packet.failuremsg.len() >= 2 {
1631                                                                 let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
1632
1633                                                                 let mut hmac = Hmac::new(Sha256::new(), &um);
1634                                                                 hmac.input(&err_packet.encode()[32..]);
1635                                                                 let mut calc_tag = [0u8; 32];
1636                                                                 hmac.raw_result(&mut calc_tag);
1637                                                                 if crypto::util::fixed_time_eq(&calc_tag, &err_packet.hmac) {
1638                                                                         const UNKNOWN_CHAN: u16 = 0x4000|10;
1639                                                                         const TEMP_CHAN_FAILURE: u16 = 0x4000|7;
1640                                                                         match byte_utils::slice_to_be16(&err_packet.failuremsg[0..2]) {
1641                                                                                 TEMP_CHAN_FAILURE => {
1642                                                                                         if err_packet.failuremsg.len() >= 4 {
1643                                                                                                 let update_len = byte_utils::slice_to_be16(&err_packet.failuremsg[2..4]) as usize;
1644                                                                                                 if err_packet.failuremsg.len() >= 4 + update_len {
1645                                                                                                         if let Ok(chan_update) = msgs::ChannelUpdate::decode(&err_packet.failuremsg[4..4 + update_len]) {
1646                                                                                                                 res = Some(msgs::HTLCFailChannelUpdate::ChannelUpdateMessage {
1647                                                                                                                         msg: chan_update,
1648                                                                                                                 });
1649                                                                                                         }
1650                                                                                                 }
1651                                                                                         }
1652                                                                                 },
1653                                                                                 UNKNOWN_CHAN => {
1654                                                                                         // No such next-hop. We know this came from the
1655                                                                                         // current node as the HMAC validated.
1656                                                                                         res = Some(msgs::HTLCFailChannelUpdate::ChannelClosed {
1657                                                                                                 short_channel_id: route_hop.short_channel_id
1658                                                                                         });
1659                                                                                 },
1660                                                                                 _ => {}, //TODO: Enumerate all of these!
1661                                                                         }
1662                                                                 }
1663                                                         }
1664                                                 }
1665                                         }).unwrap();
1666                                         Ok(res)
1667                                 },
1668                                 _ => { Ok(None) },
1669                         }
1670                 } else {
1671                         Ok(None)
1672                 }
1673         }
1674
1675         fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) -> Result<(), HandleError> {
1676                 let mut channel_state = self.channel_state.lock().unwrap();
1677                 match channel_state.by_id.get_mut(&msg.channel_id) {
1678                         Some(chan) => {
1679                                 if chan.get_their_node_id() != *their_node_id {
1680                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1681                                 }
1682                                 chan.update_fail_malformed_htlc(&msg, HTLCFailReason::Reason { failure_code: msg.failure_code, data: Vec::new() })
1683                         },
1684                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1685                 }
1686         }
1687
1688         fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>), HandleError> {
1689                 let (revoke_and_ack, commitment_signed, chan_monitor) = {
1690                         let mut channel_state = self.channel_state.lock().unwrap();
1691                         match channel_state.by_id.get_mut(&msg.channel_id) {
1692                                 Some(chan) => {
1693                                         if chan.get_their_node_id() != *their_node_id {
1694                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1695                                         }
1696                                         chan.commitment_signed(&msg)?
1697                                 },
1698                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1699                         }
1700                 };
1701                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1702                         unimplemented!();
1703                 }
1704
1705                 Ok((revoke_and_ack, commitment_signed))
1706         }
1707
1708         fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) -> Result<Option<msgs::CommitmentUpdate>, HandleError> {
1709                 let (res, mut pending_forwards, mut pending_failures, chan_monitor) = {
1710                         let mut channel_state = self.channel_state.lock().unwrap();
1711                         match channel_state.by_id.get_mut(&msg.channel_id) {
1712                                 Some(chan) => {
1713                                         if chan.get_their_node_id() != *their_node_id {
1714                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1715                                         }
1716                                         chan.revoke_and_ack(&msg)?
1717                                 },
1718                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1719                         }
1720                 };
1721                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1722                         unimplemented!();
1723                 }
1724                 for failure in pending_failures.drain(..) {
1725                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &failure.0, failure.1);
1726                 }
1727
1728                 let mut forward_event = None;
1729                 if !pending_forwards.is_empty() {
1730                         let mut channel_state = self.channel_state.lock().unwrap();
1731                         if channel_state.forward_htlcs.is_empty() {
1732                                 forward_event = Some(Instant::now() + Duration::from_millis(((rng::rand_f32() * 4.0 + 1.0) * MIN_HTLC_RELAY_HOLDING_CELL_MILLIS as f32) as u64));
1733                                 channel_state.next_forward = forward_event.unwrap();
1734                         }
1735                         for forward_info in pending_forwards.drain(..) {
1736                                 match channel_state.forward_htlcs.entry(forward_info.short_channel_id) {
1737                                         hash_map::Entry::Occupied(mut entry) => {
1738                                                 entry.get_mut().push(forward_info);
1739                                         },
1740                                         hash_map::Entry::Vacant(entry) => {
1741                                                 entry.insert(vec!(forward_info));
1742                                         }
1743                                 }
1744                         }
1745                 }
1746                 match forward_event {
1747                         Some(time) => {
1748                                 let mut pending_events = self.pending_events.lock().unwrap();
1749                                 pending_events.push(events::Event::PendingHTLCsForwardable {
1750                                         time_forwardable: time
1751                                 });
1752                         }
1753                         None => {},
1754                 }
1755
1756                 Ok(res)
1757         }
1758
1759         fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) -> Result<(), HandleError> {
1760                 let mut channel_state = self.channel_state.lock().unwrap();
1761                 match channel_state.by_id.get_mut(&msg.channel_id) {
1762                         Some(chan) => {
1763                                 if chan.get_their_node_id() != *their_node_id {
1764                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1765                                 }
1766                                 chan.update_fee(&*self.fee_estimator, &msg)
1767                         },
1768                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1769                 }
1770         }
1771
1772         fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) -> Result<(), HandleError> {
1773                 let (chan_announcement, chan_update) = {
1774                         let mut channel_state = self.channel_state.lock().unwrap();
1775                         match channel_state.by_id.get_mut(&msg.channel_id) {
1776                                 Some(chan) => {
1777                                         if chan.get_their_node_id() != *their_node_id {
1778                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1779                                         }
1780                                         if !chan.is_usable() {
1781                                                 return Err(HandleError{err: "Got an announcement_signatures before we were ready for it", action: None });
1782                                         }
1783
1784                                         let our_node_id = self.get_our_node_id();
1785                                         let (announcement, our_bitcoin_sig) = chan.get_channel_announcement(our_node_id.clone(), self.genesis_hash.clone())?;
1786
1787                                         let were_node_one = announcement.node_id_1 == our_node_id;
1788                                         let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
1789                                         secp_call!(self.secp_ctx.verify(&msghash, &msg.node_signature, if were_node_one { &announcement.node_id_2 } else { &announcement.node_id_1 }));
1790                                         secp_call!(self.secp_ctx.verify(&msghash, &msg.bitcoin_signature, if were_node_one { &announcement.bitcoin_key_2 } else { &announcement.bitcoin_key_1 }));
1791
1792                                         let our_node_sig = secp_call!(self.secp_ctx.sign(&msghash, &self.our_network_key));
1793
1794                                         (msgs::ChannelAnnouncement {
1795                                                 node_signature_1: if were_node_one { our_node_sig } else { msg.node_signature },
1796                                                 node_signature_2: if were_node_one { msg.node_signature } else { our_node_sig },
1797                                                 bitcoin_signature_1: if were_node_one { our_bitcoin_sig } else { msg.bitcoin_signature },
1798                                                 bitcoin_signature_2: if were_node_one { msg.bitcoin_signature } else { our_bitcoin_sig },
1799                                                 contents: announcement,
1800                                         }, self.get_channel_update(chan).unwrap()) // can only fail if we're not in a ready state
1801                                 },
1802                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1803                         }
1804                 };
1805                 let mut pending_events = self.pending_events.lock().unwrap();
1806                 pending_events.push(events::Event::BroadcastChannelAnnouncement { msg: chan_announcement, update_msg: chan_update });
1807                 Ok(())
1808         }
1809
1810         fn peer_disconnected(&self, their_node_id: &PublicKey, no_connection_possible: bool) {
1811                 let mut new_events = Vec::new();
1812                 {
1813                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1814                         let channel_state = channel_state_lock.borrow_parts();
1815                         let short_to_id = channel_state.short_to_id;
1816                         if no_connection_possible {
1817                                 channel_state.by_id.retain(|_, chan| {
1818                                         if chan.get_their_node_id() == *their_node_id {
1819                                                 if let Some(short_id) = chan.get_short_channel_id() {
1820                                                         short_to_id.remove(&short_id);
1821                                                 }
1822                                                 let txn_to_broadcast = chan.force_shutdown();
1823                                                 for tx in txn_to_broadcast {
1824                                                         self.tx_broadcaster.broadcast_transaction(&tx);
1825                                                 }
1826                                                 if let Ok(update) = self.get_channel_update(&chan) {
1827                                                         new_events.push(events::Event::BroadcastChannelUpdate {
1828                                                                 msg: update
1829                                                         });
1830                                                 }
1831                                                 false
1832                                         } else {
1833                                                 true
1834                                         }
1835                                 });
1836                         } else {
1837                                 for chan in channel_state.by_id {
1838                                         if chan.1.get_their_node_id() == *their_node_id {
1839                                                 //TODO: mark channel disabled (and maybe announce such after a timeout). Also
1840                                                 //fail and wipe any uncommitted outbound HTLCs as those are considered after
1841                                                 //reconnect.
1842                                         }
1843                                 }
1844                         }
1845                 }
1846                 if !new_events.is_empty() {
1847                         let mut pending_events = self.pending_events.lock().unwrap();
1848                         for event in new_events.drain(..) {
1849                                 pending_events.push(event);
1850                         }
1851                 }
1852         }
1853 }
1854
1855 #[cfg(test)]
1856 mod tests {
1857         use chain::chaininterface;
1858         use chain::transaction::OutPoint;
1859         use chain::chaininterface::ChainListener;
1860         use ln::channelmanager::{ChannelManager,OnionKeys};
1861         use ln::router::{Route, RouteHop, Router};
1862         use ln::msgs;
1863         use ln::msgs::{MsgEncodable,ChannelMessageHandler,RoutingMessageHandler};
1864         use util::test_utils;
1865         use util::events::{Event, EventsProvider};
1866
1867         use bitcoin::util::misc::hex_bytes;
1868         use bitcoin::util::hash::Sha256dHash;
1869         use bitcoin::blockdata::block::{Block, BlockHeader};
1870         use bitcoin::blockdata::transaction::{Transaction, TxOut};
1871         use bitcoin::network::constants::Network;
1872         use bitcoin::network::serialize::serialize;
1873         use bitcoin::network::serialize::BitcoinHash;
1874
1875         use secp256k1::Secp256k1;
1876         use secp256k1::key::{PublicKey,SecretKey};
1877
1878         use crypto::sha2::Sha256;
1879         use crypto::digest::Digest;
1880
1881         use rand::{thread_rng,Rng};
1882
1883         use std::collections::HashMap;
1884         use std::default::Default;
1885         use std::sync::{Arc, Mutex};
1886         use std::time::Instant;
1887         use std::mem;
1888
1889         fn build_test_onion_keys() -> Vec<OnionKeys> {
1890                 // Keys from BOLT 4, used in both test vector tests
1891                 let secp_ctx = Secp256k1::new();
1892
1893                 let route = Route {
1894                         hops: vec!(
1895                                         RouteHop {
1896                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]).unwrap(),
1897                                                 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
1898                                         },
1899                                         RouteHop {
1900                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("0324653eac434488002cc06bbfb7f10fe18991e35f9fe4302dbea6d2353dc0ab1c").unwrap()[..]).unwrap(),
1901                                                 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
1902                                         },
1903                                         RouteHop {
1904                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("027f31ebc5462c1fdce1b737ecff52d37d75dea43ce11c74d25aa297165faa2007").unwrap()[..]).unwrap(),
1905                                                 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
1906                                         },
1907                                         RouteHop {
1908                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]).unwrap(),
1909                                                 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
1910                                         },
1911                                         RouteHop {
1912                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("02edabbd16b41c8371b92ef2f04c1185b4f03b6dcd52ba9b78d9d7c89c8f221145").unwrap()[..]).unwrap(),
1913                                                 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
1914                                         },
1915                         ),
1916                 };
1917
1918                 let session_priv = SecretKey::from_slice(&secp_ctx, &hex_bytes("4141414141414141414141414141414141414141414141414141414141414141").unwrap()[..]).unwrap();
1919
1920                 let onion_keys = ChannelManager::construct_onion_keys(&secp_ctx, &route, &session_priv).unwrap();
1921                 assert_eq!(onion_keys.len(), route.hops.len());
1922                 onion_keys
1923         }
1924
1925         #[test]
1926         fn onion_vectors() {
1927                 // Packet creation test vectors from BOLT 4
1928                 let onion_keys = build_test_onion_keys();
1929
1930                 assert_eq!(onion_keys[0].shared_secret[..], hex_bytes("53eb63ea8a3fec3b3cd433b85cd62a4b145e1dda09391b348c4e1cd36a03ea66").unwrap()[..]);
1931                 assert_eq!(onion_keys[0].blinding_factor[..], hex_bytes("2ec2e5da605776054187180343287683aa6a51b4b1c04d6dd49c45d8cffb3c36").unwrap()[..]);
1932                 assert_eq!(onion_keys[0].ephemeral_pubkey.serialize()[..], hex_bytes("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]);
1933                 assert_eq!(onion_keys[0].rho, hex_bytes("ce496ec94def95aadd4bec15cdb41a740c9f2b62347c4917325fcc6fb0453986").unwrap()[..]);
1934                 assert_eq!(onion_keys[0].mu, hex_bytes("b57061dc6d0a2b9f261ac410c8b26d64ac5506cbba30267a649c28c179400eba").unwrap()[..]);
1935
1936                 assert_eq!(onion_keys[1].shared_secret[..], hex_bytes("a6519e98832a0b179f62123b3567c106db99ee37bef036e783263602f3488fae").unwrap()[..]);
1937                 assert_eq!(onion_keys[1].blinding_factor[..], hex_bytes("bf66c28bc22e598cfd574a1931a2bafbca09163df2261e6d0056b2610dab938f").unwrap()[..]);
1938                 assert_eq!(onion_keys[1].ephemeral_pubkey.serialize()[..], hex_bytes("028f9438bfbf7feac2e108d677e3a82da596be706cc1cf342b75c7b7e22bf4e6e2").unwrap()[..]);
1939                 assert_eq!(onion_keys[1].rho, hex_bytes("450ffcabc6449094918ebe13d4f03e433d20a3d28a768203337bc40b6e4b2c59").unwrap()[..]);
1940                 assert_eq!(onion_keys[1].mu, hex_bytes("05ed2b4a3fb023c2ff5dd6ed4b9b6ea7383f5cfe9d59c11d121ec2c81ca2eea9").unwrap()[..]);
1941
1942                 assert_eq!(onion_keys[2].shared_secret[..], hex_bytes("3a6b412548762f0dbccce5c7ae7bb8147d1caf9b5471c34120b30bc9c04891cc").unwrap()[..]);
1943                 assert_eq!(onion_keys[2].blinding_factor[..], hex_bytes("a1f2dadd184eb1627049673f18c6325814384facdee5bfd935d9cb031a1698a5").unwrap()[..]);
1944                 assert_eq!(onion_keys[2].ephemeral_pubkey.serialize()[..], hex_bytes("03bfd8225241ea71cd0843db7709f4c222f62ff2d4516fd38b39914ab6b83e0da0").unwrap()[..]);
1945                 assert_eq!(onion_keys[2].rho, hex_bytes("11bf5c4f960239cb37833936aa3d02cea82c0f39fd35f566109c41f9eac8deea").unwrap()[..]);
1946                 assert_eq!(onion_keys[2].mu, hex_bytes("caafe2820fa00eb2eeb78695ae452eba38f5a53ed6d53518c5c6edf76f3f5b78").unwrap()[..]);
1947
1948                 assert_eq!(onion_keys[3].shared_secret[..], hex_bytes("21e13c2d7cfe7e18836df50872466117a295783ab8aab0e7ecc8c725503ad02d").unwrap()[..]);
1949                 assert_eq!(onion_keys[3].blinding_factor[..], hex_bytes("7cfe0b699f35525029ae0fa437c69d0f20f7ed4e3916133f9cacbb13c82ff262").unwrap()[..]);
1950                 assert_eq!(onion_keys[3].ephemeral_pubkey.serialize()[..], hex_bytes("031dde6926381289671300239ea8e57ffaf9bebd05b9a5b95beaf07af05cd43595").unwrap()[..]);
1951                 assert_eq!(onion_keys[3].rho, hex_bytes("cbe784ab745c13ff5cffc2fbe3e84424aa0fd669b8ead4ee562901a4a4e89e9e").unwrap()[..]);
1952                 assert_eq!(onion_keys[3].mu, hex_bytes("5052aa1b3d9f0655a0932e50d42f0c9ba0705142c25d225515c45f47c0036ee9").unwrap()[..]);
1953
1954                 assert_eq!(onion_keys[4].shared_secret[..], hex_bytes("b5756b9b542727dbafc6765a49488b023a725d631af688fc031217e90770c328").unwrap()[..]);
1955                 assert_eq!(onion_keys[4].blinding_factor[..], hex_bytes("c96e00dddaf57e7edcd4fb5954be5b65b09f17cb6d20651b4e90315be5779205").unwrap()[..]);
1956                 assert_eq!(onion_keys[4].ephemeral_pubkey.serialize()[..], hex_bytes("03a214ebd875aab6ddfd77f22c5e7311d7f77f17a169e599f157bbcdae8bf071f4").unwrap()[..]);
1957                 assert_eq!(onion_keys[4].rho, hex_bytes("034e18b8cc718e8af6339106e706c52d8df89e2b1f7e9142d996acf88df8799b").unwrap()[..]);
1958                 assert_eq!(onion_keys[4].mu, hex_bytes("8e45e5c61c2b24cb6382444db6698727afb063adecd72aada233d4bf273d975a").unwrap()[..]);
1959
1960                 // Test vectors below are flat-out wrong: they claim to set outgoing_cltv_value to non-0 :/
1961                 let payloads = vec!(
1962                         msgs::OnionHopData {
1963                                 realm: 0,
1964                                 data: msgs::OnionRealm0HopData {
1965                                         short_channel_id: 0,
1966                                         amt_to_forward: 0,
1967                                         outgoing_cltv_value: 0,
1968                                 },
1969                                 hmac: [0; 32],
1970                         },
1971                         msgs::OnionHopData {
1972                                 realm: 0,
1973                                 data: msgs::OnionRealm0HopData {
1974                                         short_channel_id: 0x0101010101010101,
1975                                         amt_to_forward: 0x0100000001,
1976                                         outgoing_cltv_value: 0,
1977                                 },
1978                                 hmac: [0; 32],
1979                         },
1980                         msgs::OnionHopData {
1981                                 realm: 0,
1982                                 data: msgs::OnionRealm0HopData {
1983                                         short_channel_id: 0x0202020202020202,
1984                                         amt_to_forward: 0x0200000002,
1985                                         outgoing_cltv_value: 0,
1986                                 },
1987                                 hmac: [0; 32],
1988                         },
1989                         msgs::OnionHopData {
1990                                 realm: 0,
1991                                 data: msgs::OnionRealm0HopData {
1992                                         short_channel_id: 0x0303030303030303,
1993                                         amt_to_forward: 0x0300000003,
1994                                         outgoing_cltv_value: 0,
1995                                 },
1996                                 hmac: [0; 32],
1997                         },
1998                         msgs::OnionHopData {
1999                                 realm: 0,
2000                                 data: msgs::OnionRealm0HopData {
2001                                         short_channel_id: 0x0404040404040404,
2002                                         amt_to_forward: 0x0400000004,
2003                                         outgoing_cltv_value: 0,
2004                                 },
2005                                 hmac: [0; 32],
2006                         },
2007                 );
2008
2009                 let packet = ChannelManager::construct_onion_packet(payloads, onion_keys, hex_bytes("4242424242424242424242424242424242424242424242424242424242424242").unwrap()).unwrap();
2010                 // Just check the final packet encoding, as it includes all the per-hop vectors in it
2011                 // anyway...
2012                 assert_eq!(packet.encode(), hex_bytes("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").unwrap());
2013         }
2014
2015         #[test]
2016         fn test_failure_packet_onion() {
2017                 // Returning Errors test vectors from BOLT 4
2018
2019                 let onion_keys = build_test_onion_keys();
2020                 let onion_error = ChannelManager::build_failure_packet(&onion_keys[4].shared_secret, 0x2002, &[0; 0]);
2021                 assert_eq!(onion_error.encode(), hex_bytes("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").unwrap());
2022
2023                 let onion_packet_1 = ChannelManager::encrypt_failure_packet(&onion_keys[4].shared_secret, &onion_error.encode()[..]);
2024                 assert_eq!(onion_packet_1.data, hex_bytes("a5e6bd0c74cb347f10cce367f949098f2457d14c046fd8a22cb96efb30b0fdcda8cb9168b50f2fd45edd73c1b0c8b33002df376801ff58aaa94000bf8a86f92620f343baef38a580102395ae3abf9128d1047a0736ff9b83d456740ebbb4aeb3aa9737f18fb4afb4aa074fb26c4d702f42968888550a3bded8c05247e045b866baef0499f079fdaeef6538f31d44deafffdfd3afa2fb4ca9082b8f1c465371a9894dd8c243fb4847e004f5256b3e90e2edde4c9fb3082ddfe4d1e734cacd96ef0706bf63c9984e22dc98851bcccd1c3494351feb458c9c6af41c0044bea3c47552b1d992ae542b17a2d0bba1a096c78d169034ecb55b6e3a7263c26017f033031228833c1daefc0dedb8cf7c3e37c9c37ebfe42f3225c326e8bcfd338804c145b16e34e4").unwrap());
2025
2026                 let onion_packet_2 = ChannelManager::encrypt_failure_packet(&onion_keys[3].shared_secret, &onion_packet_1.data[..]);
2027                 assert_eq!(onion_packet_2.data, hex_bytes("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").unwrap());
2028
2029                 let onion_packet_3 = ChannelManager::encrypt_failure_packet(&onion_keys[2].shared_secret, &onion_packet_2.data[..]);
2030                 assert_eq!(onion_packet_3.data, hex_bytes("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").unwrap());
2031
2032                 let onion_packet_4 = ChannelManager::encrypt_failure_packet(&onion_keys[1].shared_secret, &onion_packet_3.data[..]);
2033                 assert_eq!(onion_packet_4.data, hex_bytes("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").unwrap());
2034
2035                 let onion_packet_5 = ChannelManager::encrypt_failure_packet(&onion_keys[0].shared_secret, &onion_packet_4.data[..]);
2036                 assert_eq!(onion_packet_5.data, hex_bytes("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").unwrap());
2037         }
2038
2039         fn confirm_transaction(chain: &chaininterface::ChainWatchInterfaceUtil, tx: &Transaction, chan_id: u32) {
2040                 assert!(chain.does_match_tx(tx));
2041                 let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2042                 chain.block_connected_checked(&header, 1, &[tx; 1], &[chan_id; 1]);
2043                 for i in 2..100 {
2044                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2045                         chain.block_connected_checked(&header, i, &[tx; 0], &[0; 0]);
2046                 }
2047         }
2048
2049         struct Node {
2050                 feeest: Arc<test_utils::TestFeeEstimator>,
2051                 chain_monitor: Arc<chaininterface::ChainWatchInterfaceUtil>,
2052                 tx_broadcaster: Arc<test_utils::TestBroadcaster>,
2053                 chan_monitor: Arc<test_utils::TestChannelMonitor>,
2054                 node_id: SecretKey,
2055                 node: Arc<ChannelManager>,
2056                 router: Router,
2057         }
2058
2059         static mut CHAN_COUNT: u32 = 0;
2060         fn create_chan_between_nodes(node_a: &Node, node_b: &Node) -> (msgs::ChannelAnnouncement, msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction) {
2061                 node_a.node.create_channel(node_b.node.get_our_node_id(), 100000, 42).unwrap();
2062
2063                 let events_1 = node_a.node.get_and_clear_pending_events();
2064                 assert_eq!(events_1.len(), 1);
2065                 let accept_chan = match events_1[0] {
2066                         Event::SendOpenChannel { ref node_id, ref msg } => {
2067                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2068                                 node_b.node.handle_open_channel(&node_a.node.get_our_node_id(), msg).unwrap()
2069                         },
2070                         _ => panic!("Unexpected event"),
2071                 };
2072
2073                 node_a.node.handle_accept_channel(&node_b.node.get_our_node_id(), &accept_chan).unwrap();
2074
2075                 let chan_id = unsafe { CHAN_COUNT };
2076                 let tx;
2077                 let funding_output;
2078
2079                 let events_2 = node_a.node.get_and_clear_pending_events();
2080                 assert_eq!(events_2.len(), 1);
2081                 match events_2[0] {
2082                         Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, user_channel_id } => {
2083                                 assert_eq!(*channel_value_satoshis, 100000);
2084                                 assert_eq!(user_channel_id, 42);
2085
2086                                 tx = Transaction { version: chan_id as u32, lock_time: 0, input: Vec::new(), output: vec![TxOut {
2087                                         value: *channel_value_satoshis, script_pubkey: output_script.clone(),
2088                                 }]};
2089                                 funding_output = OutPoint::new(Sha256dHash::from_data(&serialize(&tx).unwrap()[..]), 0);
2090
2091                                 node_a.node.funding_transaction_generated(&temporary_channel_id, funding_output);
2092                                 let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
2093                                 assert_eq!(added_monitors.len(), 1);
2094                                 assert_eq!(added_monitors[0].0, funding_output);
2095                                 added_monitors.clear();
2096                         },
2097                         _ => panic!("Unexpected event"),
2098                 }
2099
2100                 let events_3 = node_a.node.get_and_clear_pending_events();
2101                 assert_eq!(events_3.len(), 1);
2102                 let funding_signed = match events_3[0] {
2103                         Event::SendFundingCreated { ref node_id, ref msg } => {
2104                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2105                                 let res = node_b.node.handle_funding_created(&node_a.node.get_our_node_id(), msg).unwrap();
2106                                 let mut added_monitors = node_b.chan_monitor.added_monitors.lock().unwrap();
2107                                 assert_eq!(added_monitors.len(), 1);
2108                                 assert_eq!(added_monitors[0].0, funding_output);
2109                                 added_monitors.clear();
2110                                 res
2111                         },
2112                         _ => panic!("Unexpected event"),
2113                 };
2114
2115                 node_a.node.handle_funding_signed(&node_b.node.get_our_node_id(), &funding_signed).unwrap();
2116                 {
2117                         let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
2118                         assert_eq!(added_monitors.len(), 1);
2119                         assert_eq!(added_monitors[0].0, funding_output);
2120                         added_monitors.clear();
2121                 }
2122
2123                 let events_4 = node_a.node.get_and_clear_pending_events();
2124                 assert_eq!(events_4.len(), 1);
2125                 match events_4[0] {
2126                         Event::FundingBroadcastSafe { ref funding_txo, user_channel_id } => {
2127                                 assert_eq!(user_channel_id, 42);
2128                                 assert_eq!(*funding_txo, funding_output);
2129                         },
2130                         _ => panic!("Unexpected event"),
2131                 };
2132
2133                 confirm_transaction(&node_a.chain_monitor, &tx, chan_id);
2134                 let events_5 = node_a.node.get_and_clear_pending_events();
2135                 assert_eq!(events_5.len(), 1);
2136                 match events_5[0] {
2137                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
2138                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2139                                 assert!(announcement_sigs.is_none());
2140                                 node_b.node.handle_funding_locked(&node_a.node.get_our_node_id(), msg).unwrap()
2141                         },
2142                         _ => panic!("Unexpected event"),
2143                 };
2144
2145                 let channel_id;
2146
2147                 confirm_transaction(&node_b.chain_monitor, &tx, chan_id);
2148                 let events_6 = node_b.node.get_and_clear_pending_events();
2149                 assert_eq!(events_6.len(), 1);
2150                 let as_announcement_sigs = match events_6[0] {
2151                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
2152                                 assert_eq!(*node_id, node_a.node.get_our_node_id());
2153                                 channel_id = msg.channel_id.clone();
2154                                 let as_announcement_sigs = node_a.node.handle_funding_locked(&node_b.node.get_our_node_id(), msg).unwrap().unwrap();
2155                                 node_a.node.handle_announcement_signatures(&node_b.node.get_our_node_id(), &(*announcement_sigs).clone().unwrap()).unwrap();
2156                                 as_announcement_sigs
2157                         },
2158                         _ => panic!("Unexpected event"),
2159                 };
2160
2161                 let events_7 = node_a.node.get_and_clear_pending_events();
2162                 assert_eq!(events_7.len(), 1);
2163                 let (announcement, as_update) = match events_7[0] {
2164                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
2165                                 (msg, update_msg)
2166                         },
2167                         _ => panic!("Unexpected event"),
2168                 };
2169
2170                 node_b.node.handle_announcement_signatures(&node_a.node.get_our_node_id(), &as_announcement_sigs).unwrap();
2171                 let events_8 = node_b.node.get_and_clear_pending_events();
2172                 assert_eq!(events_8.len(), 1);
2173                 let bs_update = match events_8[0] {
2174                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
2175                                 assert!(*announcement == *msg);
2176                                 update_msg
2177                         },
2178                         _ => panic!("Unexpected event"),
2179                 };
2180
2181                 unsafe {
2182                         CHAN_COUNT += 1;
2183                 }
2184
2185                 ((*announcement).clone(), (*as_update).clone(), (*bs_update).clone(), channel_id, tx)
2186         }
2187
2188         fn create_announced_chan_between_nodes(nodes: &Vec<Node>, a: usize, b: usize) -> (msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction) {
2189                 let chan_announcement = create_chan_between_nodes(&nodes[a], &nodes[b]);
2190                 for node in nodes {
2191                         assert!(node.router.handle_channel_announcement(&chan_announcement.0).unwrap());
2192                         node.router.handle_channel_update(&chan_announcement.1).unwrap();
2193                         node.router.handle_channel_update(&chan_announcement.2).unwrap();
2194                 }
2195                 (chan_announcement.1, chan_announcement.2, chan_announcement.3, chan_announcement.4)
2196         }
2197
2198         fn close_channel(outbound_node: &Node, inbound_node: &Node, channel_id: &[u8; 32], funding_tx: Transaction, close_inbound_first: bool) -> (msgs::ChannelUpdate, msgs::ChannelUpdate) {
2199                 let (node_a, broadcaster_a) = if close_inbound_first { (&inbound_node.node, &inbound_node.tx_broadcaster) } else { (&outbound_node.node, &outbound_node.tx_broadcaster) };
2200                 let (node_b, broadcaster_b) = if close_inbound_first { (&outbound_node.node, &outbound_node.tx_broadcaster) } else { (&inbound_node.node, &inbound_node.tx_broadcaster) };
2201                 let (tx_a, tx_b);
2202
2203                 node_a.close_channel(channel_id).unwrap();
2204                 let events_1 = node_a.get_and_clear_pending_events();
2205                 assert_eq!(events_1.len(), 1);
2206                 let shutdown_a = match events_1[0] {
2207                         Event::SendShutdown { ref node_id, ref msg } => {
2208                                 assert_eq!(node_id, &node_b.get_our_node_id());
2209                                 msg.clone()
2210                         },
2211                         _ => panic!("Unexpected event"),
2212                 };
2213
2214                 let (shutdown_b, mut closing_signed_b) = node_b.handle_shutdown(&node_a.get_our_node_id(), &shutdown_a).unwrap();
2215                 if !close_inbound_first {
2216                         assert!(closing_signed_b.is_none());
2217                 }
2218                 let (empty_a, mut closing_signed_a) = node_a.handle_shutdown(&node_b.get_our_node_id(), &shutdown_b.unwrap()).unwrap();
2219                 assert!(empty_a.is_none());
2220                 if close_inbound_first {
2221                         assert!(closing_signed_a.is_none());
2222                         closing_signed_a = node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
2223                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
2224                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
2225
2226                         let empty_b = node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
2227                         assert!(empty_b.is_none());
2228                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
2229                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
2230                 } else {
2231                         closing_signed_b = node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
2232                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
2233                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
2234
2235                         let empty_a2 = node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
2236                         assert!(empty_a2.is_none());
2237                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
2238                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
2239                 }
2240                 assert_eq!(tx_a, tx_b);
2241                 let mut funding_tx_map = HashMap::new();
2242                 funding_tx_map.insert(funding_tx.txid(), funding_tx);
2243                 tx_a.verify(&funding_tx_map).unwrap();
2244
2245                 let events_2 = node_a.get_and_clear_pending_events();
2246                 assert_eq!(events_2.len(), 1);
2247                 let as_update = match events_2[0] {
2248                         Event::BroadcastChannelUpdate { ref msg } => {
2249                                 msg.clone()
2250                         },
2251                         _ => panic!("Unexpected event"),
2252                 };
2253
2254                 let events_3 = node_b.get_and_clear_pending_events();
2255                 assert_eq!(events_3.len(), 1);
2256                 let bs_update = match events_3[0] {
2257                         Event::BroadcastChannelUpdate { ref msg } => {
2258                                 msg.clone()
2259                         },
2260                         _ => panic!("Unexpected event"),
2261                 };
2262
2263                 (as_update, bs_update)
2264         }
2265
2266         struct SendEvent {
2267                 node_id: PublicKey,
2268                 msgs: Vec<msgs::UpdateAddHTLC>,
2269                 commitment_msg: msgs::CommitmentSigned,
2270         }
2271         impl SendEvent {
2272                 fn from_event(event: Event) -> SendEvent {
2273                         match event {
2274                                 Event::SendHTLCs { node_id, msgs, commitment_msg } => {
2275                                         SendEvent { node_id: node_id, msgs: msgs, commitment_msg: commitment_msg }
2276                                 },
2277                                 _ => panic!("Unexpected event type!"),
2278                         }
2279                 }
2280         }
2281
2282         static mut PAYMENT_COUNT: u8 = 0;
2283         fn send_along_route(origin_node: &Node, route: Route, expected_route: &[&Node], recv_value: u64) -> ([u8; 32], [u8; 32]) {
2284                 let our_payment_preimage = unsafe { [PAYMENT_COUNT; 32] };
2285                 unsafe { PAYMENT_COUNT += 1 };
2286                 let our_payment_hash = {
2287                         let mut sha = Sha256::new();
2288                         sha.input(&our_payment_preimage[..]);
2289                         let mut ret = [0; 32];
2290                         sha.result(&mut ret);
2291                         ret
2292                 };
2293
2294                 let mut payment_event = {
2295                         origin_node.node.send_payment(route, our_payment_hash).unwrap();
2296                         {
2297                                 let mut added_monitors = origin_node.chan_monitor.added_monitors.lock().unwrap();
2298                                 assert_eq!(added_monitors.len(), 1);
2299                                 added_monitors.clear();
2300                         }
2301
2302                         let mut events = origin_node.node.get_and_clear_pending_events();
2303                         assert_eq!(events.len(), 1);
2304                         SendEvent::from_event(events.remove(0))
2305                 };
2306                 let mut prev_node = origin_node;
2307
2308                 for (idx, &node) in expected_route.iter().enumerate() {
2309                         assert_eq!(node.node.get_our_node_id(), payment_event.node_id);
2310
2311                         node.node.handle_update_add_htlc(&prev_node.node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
2312                         {
2313                                 let added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2314                                 assert_eq!(added_monitors.len(), 0);
2315                         }
2316
2317                         let revoke_and_ack = node.node.handle_commitment_signed(&prev_node.node.get_our_node_id(), &payment_event.commitment_msg).unwrap();
2318                         {
2319                                 let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2320                                 assert_eq!(added_monitors.len(), 1);
2321                                 added_monitors.clear();
2322                         }
2323                         assert!(prev_node.node.handle_revoke_and_ack(&node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2324                         let prev_revoke_and_ack = prev_node.node.handle_commitment_signed(&node.node.get_our_node_id(), &revoke_and_ack.1.unwrap()).unwrap();
2325                         {
2326                                 let mut added_monitors = prev_node.chan_monitor.added_monitors.lock().unwrap();
2327                                 assert_eq!(added_monitors.len(), 2);
2328                                 added_monitors.clear();
2329                         }
2330                         assert!(node.node.handle_revoke_and_ack(&prev_node.node.get_our_node_id(), &prev_revoke_and_ack.0).unwrap().is_none());
2331                         assert!(prev_revoke_and_ack.1.is_none());
2332                         {
2333                                 let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2334                                 assert_eq!(added_monitors.len(), 1);
2335                                 added_monitors.clear();
2336                         }
2337
2338                         let events_1 = node.node.get_and_clear_pending_events();
2339                         assert_eq!(events_1.len(), 1);
2340                         match events_1[0] {
2341                                 Event::PendingHTLCsForwardable { .. } => { },
2342                                 _ => panic!("Unexpected event"),
2343                         };
2344
2345                         node.node.channel_state.lock().unwrap().next_forward = Instant::now();
2346                         node.node.process_pending_htlc_forward();
2347
2348                         let mut events_2 = node.node.get_and_clear_pending_events();
2349                         assert_eq!(events_2.len(), 1);
2350                         if idx == expected_route.len() - 1 {
2351                                 match events_2[0] {
2352                                         Event::PaymentReceived { ref payment_hash, amt } => {
2353                                                 assert_eq!(our_payment_hash, *payment_hash);
2354                                                 assert_eq!(amt, recv_value);
2355                                         },
2356                                         _ => panic!("Unexpected event"),
2357                                 }
2358                         } else {
2359                                 {
2360                                         let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2361                                         assert_eq!(added_monitors.len(), 1);
2362                                         added_monitors.clear();
2363                                 }
2364                                 payment_event = SendEvent::from_event(events_2.remove(0));
2365                                 assert_eq!(payment_event.msgs.len(), 1);
2366                         }
2367
2368                         prev_node = node;
2369                 }
2370
2371                 (our_payment_preimage, our_payment_hash)
2372         }
2373
2374         fn claim_payment(origin_node: &Node, expected_route: &[&Node], our_payment_preimage: [u8; 32]) {
2375                 assert!(expected_route.last().unwrap().node.claim_funds(our_payment_preimage));
2376                 {
2377                         let mut added_monitors = expected_route.last().unwrap().chan_monitor.added_monitors.lock().unwrap();
2378                         assert_eq!(added_monitors.len(), 1);
2379                         added_monitors.clear();
2380                 }
2381
2382                 let mut next_msgs: Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned)> = None;
2383                 macro_rules! update_fulfill_dance {
2384                         ($node: expr, $prev_node: expr, $last_node: expr) => {
2385                                 {
2386                                         $node.node.handle_update_fulfill_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
2387                                         {
2388                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2389                                                 if $last_node {
2390                                                         assert_eq!(added_monitors.len(), 1);
2391                                                 } else {
2392                                                         assert_eq!(added_monitors.len(), 2);
2393                                                         assert!(added_monitors[0].0 != added_monitors[1].0);
2394                                                 }
2395                                                 added_monitors.clear();
2396                                         }
2397                                         let revoke_and_commit = $node.node.handle_commitment_signed(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().1).unwrap();
2398                                         {
2399                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2400                                                 assert_eq!(added_monitors.len(), 1);
2401                                                 added_monitors.clear();
2402                                         }
2403                                         assert!($prev_node.node.handle_revoke_and_ack(&$node.node.get_our_node_id(), &revoke_and_commit.0).unwrap().is_none());
2404                                         let revoke_and_ack = $prev_node.node.handle_commitment_signed(&$node.node.get_our_node_id(), &revoke_and_commit.1.unwrap()).unwrap();
2405                                         assert!(revoke_and_ack.1.is_none());
2406                                         {
2407                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2408                                                 assert_eq!(added_monitors.len(), 2);
2409                                                 added_monitors.clear();
2410                                         }
2411                                         assert!($node.node.handle_revoke_and_ack(&$prev_node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2412                                         {
2413                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2414                                                 assert_eq!(added_monitors.len(), 1);
2415                                                 added_monitors.clear();
2416                                         }
2417                                 }
2418                         }
2419                 }
2420
2421                 let mut expected_next_node = expected_route.last().unwrap().node.get_our_node_id();
2422                 let mut prev_node = expected_route.last().unwrap();
2423                 for node in expected_route.iter().rev() {
2424                         assert_eq!(expected_next_node, node.node.get_our_node_id());
2425                         if next_msgs.is_some() {
2426                                 update_fulfill_dance!(node, prev_node, false);
2427                         }
2428
2429                         let events = node.node.get_and_clear_pending_events();
2430                         assert_eq!(events.len(), 1);
2431                         match events[0] {
2432                                 Event::SendFulfillHTLC { ref node_id, ref msg, ref commitment_msg } => {
2433                                         expected_next_node = node_id.clone();
2434                                         next_msgs = Some((msg.clone(), commitment_msg.clone()));
2435                                 },
2436                                 _ => panic!("Unexpected event"),
2437                         };
2438
2439                         prev_node = node;
2440                 }
2441
2442                 assert_eq!(expected_next_node, origin_node.node.get_our_node_id());
2443                 update_fulfill_dance!(origin_node, expected_route.first().unwrap(), true);
2444
2445                 let events = origin_node.node.get_and_clear_pending_events();
2446                 assert_eq!(events.len(), 1);
2447                 match events[0] {
2448                         Event::PaymentSent { payment_preimage } => {
2449                                 assert_eq!(payment_preimage, our_payment_preimage);
2450                         },
2451                         _ => panic!("Unexpected event"),
2452                 }
2453         }
2454
2455         const TEST_FINAL_CLTV: u32 = 32;
2456
2457         fn route_payment(origin_node: &Node, expected_route: &[&Node], recv_value: u64) -> ([u8; 32], [u8; 32]) {
2458                 let route = origin_node.router.get_route(&expected_route.last().unwrap().node.get_our_node_id(), None, &Vec::new(), recv_value, TEST_FINAL_CLTV).unwrap();
2459                 assert_eq!(route.hops.len(), expected_route.len());
2460                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
2461                         assert_eq!(hop.pubkey, node.node.get_our_node_id());
2462                 }
2463
2464                 send_along_route(origin_node, route, expected_route, recv_value)
2465         }
2466
2467         fn route_over_limit(origin_node: &Node, expected_route: &[&Node], recv_value: u64) {
2468                 let route = origin_node.router.get_route(&expected_route.last().unwrap().node.get_our_node_id(), None, &Vec::new(), recv_value, TEST_FINAL_CLTV).unwrap();
2469                 assert_eq!(route.hops.len(), expected_route.len());
2470                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
2471                         assert_eq!(hop.pubkey, node.node.get_our_node_id());
2472                 }
2473
2474                 let our_payment_preimage = unsafe { [PAYMENT_COUNT; 32] };
2475                 unsafe { PAYMENT_COUNT += 1 };
2476                 let our_payment_hash = {
2477                         let mut sha = Sha256::new();
2478                         sha.input(&our_payment_preimage[..]);
2479                         let mut ret = [0; 32];
2480                         sha.result(&mut ret);
2481                         ret
2482                 };
2483
2484                 let err = origin_node.node.send_payment(route, our_payment_hash).err().unwrap();
2485                 assert_eq!(err.err, "Cannot send value that would put us over our max HTLC value in flight");
2486         }
2487
2488         fn send_payment(origin: &Node, expected_route: &[&Node], recv_value: u64) {
2489                 let our_payment_preimage = route_payment(&origin, expected_route, recv_value).0;
2490                 claim_payment(&origin, expected_route, our_payment_preimage);
2491         }
2492
2493         fn fail_payment(origin_node: &Node, expected_route: &[&Node], our_payment_hash: [u8; 32]) {
2494                 assert!(expected_route.last().unwrap().node.fail_htlc_backwards(&our_payment_hash));
2495                 {
2496                         let mut added_monitors = expected_route.last().unwrap().chan_monitor.added_monitors.lock().unwrap();
2497                         assert_eq!(added_monitors.len(), 1);
2498                         added_monitors.clear();
2499                 }
2500
2501                 let mut next_msgs: Option<(msgs::UpdateFailHTLC, msgs::CommitmentSigned)> = None;
2502                 macro_rules! update_fail_dance {
2503                         ($node: expr, $prev_node: expr, $last_node: expr) => {
2504                                 {
2505                                         $node.node.handle_update_fail_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
2506                                         let revoke_and_commit = $node.node.handle_commitment_signed(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().1).unwrap();
2507
2508                                         {
2509                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2510                                                 assert_eq!(added_monitors.len(), 1);
2511                                                 added_monitors.clear();
2512                                         }
2513                                         assert!($prev_node.node.handle_revoke_and_ack(&$node.node.get_our_node_id(), &revoke_and_commit.0).unwrap().is_none());
2514                                         {
2515                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2516                                                 assert_eq!(added_monitors.len(), 1);
2517                                                 added_monitors.clear();
2518                                         }
2519                                         let revoke_and_ack = $prev_node.node.handle_commitment_signed(&$node.node.get_our_node_id(), &revoke_and_commit.1.unwrap()).unwrap();
2520                                         {
2521                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2522                                                 assert_eq!(added_monitors.len(), 1);
2523                                                 added_monitors.clear();
2524                                         }
2525                                         assert!(revoke_and_ack.1.is_none());
2526                                         assert!($node.node.get_and_clear_pending_events().is_empty());
2527                                         assert!($node.node.handle_revoke_and_ack(&$prev_node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2528                                         {
2529                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2530                                                 if $last_node {
2531                                                         assert_eq!(added_monitors.len(), 1);
2532                                                 } else {
2533                                                         assert_eq!(added_monitors.len(), 2);
2534                                                         assert!(added_monitors[0].0 != added_monitors[1].0);
2535                                                 }
2536                                                 added_monitors.clear();
2537                                         }
2538                                 }
2539                         }
2540                 }
2541
2542                 let mut expected_next_node = expected_route.last().unwrap().node.get_our_node_id();
2543                 let mut prev_node = expected_route.last().unwrap();
2544                 for node in expected_route.iter().rev() {
2545                         assert_eq!(expected_next_node, node.node.get_our_node_id());
2546                         if next_msgs.is_some() {
2547                                 update_fail_dance!(node, prev_node, false);
2548                         }
2549
2550                         let events = node.node.get_and_clear_pending_events();
2551                         assert_eq!(events.len(), 1);
2552                         match events[0] {
2553                                 Event::SendFailHTLC { ref node_id, ref msg, ref commitment_msg } => {
2554                                         expected_next_node = node_id.clone();
2555                                         next_msgs = Some((msg.clone(), commitment_msg.clone()));
2556                                 },
2557                                 _ => panic!("Unexpected event"),
2558                         };
2559
2560                         prev_node = node;
2561                 }
2562
2563                 assert_eq!(expected_next_node, origin_node.node.get_our_node_id());
2564                 update_fail_dance!(origin_node, expected_route.first().unwrap(), true);
2565
2566                 let events = origin_node.node.get_and_clear_pending_events();
2567                 assert_eq!(events.len(), 1);
2568                 match events[0] {
2569                         Event::PaymentFailed { payment_hash } => {
2570                                 assert_eq!(payment_hash, our_payment_hash);
2571                         },
2572                         _ => panic!("Unexpected event"),
2573                 }
2574         }
2575
2576         fn create_network(node_count: usize) -> Vec<Node> {
2577                 let mut nodes = Vec::new();
2578                 let mut rng = thread_rng();
2579                 let secp_ctx = Secp256k1::new();
2580
2581                 for _ in 0..node_count {
2582                         let feeest = Arc::new(test_utils::TestFeeEstimator { sat_per_vbyte: 1 });
2583                         let chain_monitor = Arc::new(chaininterface::ChainWatchInterfaceUtil::new());
2584                         let tx_broadcaster = Arc::new(test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new())});
2585                         let chan_monitor = Arc::new(test_utils::TestChannelMonitor::new(chain_monitor.clone(), tx_broadcaster.clone()));
2586                         let node_id = {
2587                                 let mut key_slice = [0; 32];
2588                                 rng.fill_bytes(&mut key_slice);
2589                                 SecretKey::from_slice(&secp_ctx, &key_slice).unwrap()
2590                         };
2591                         let node = ChannelManager::new(node_id.clone(), 0, true, Network::Testnet, feeest.clone(), chan_monitor.clone(), chain_monitor.clone(), tx_broadcaster.clone()).unwrap();
2592                         let router = Router::new(PublicKey::from_secret_key(&secp_ctx, &node_id).unwrap());
2593                         nodes.push(Node { feeest, chain_monitor, tx_broadcaster, chan_monitor, node_id, node, router });
2594                 }
2595
2596                 nodes
2597         }
2598
2599         #[test]
2600         fn fake_network_test() {
2601                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
2602                 // tests that payments get routed and transactions broadcast in semi-reasonable ways.
2603                 let nodes = create_network(4);
2604
2605                 // Create some initial channels
2606                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
2607                 let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2);
2608                 let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3);
2609
2610                 // Rebalance the network a bit by relaying one payment through all the channels...
2611                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2612                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2613                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2614                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2615
2616                 // Send some more payments
2617                 send_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 1000000);
2618                 send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1], &nodes[0])[..], 1000000);
2619                 send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1])[..], 1000000);
2620
2621                 // Test failure packets
2622                 let payment_hash_1 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 1000000).1;
2623                 fail_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], payment_hash_1);
2624
2625                 // Add a new channel that skips 3
2626                 let chan_4 = create_announced_chan_between_nodes(&nodes, 1, 3);
2627
2628                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 1000000);
2629                 send_payment(&nodes[2], &vec!(&nodes[3])[..], 1000000);
2630                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2631                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2632                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2633                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2634                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2635
2636                 // Do some rebalance loop payments, simultaneously
2637                 let mut hops = Vec::with_capacity(3);
2638                 hops.push(RouteHop {
2639                         pubkey: nodes[2].node.get_our_node_id(),
2640                         short_channel_id: chan_2.0.contents.short_channel_id,
2641                         fee_msat: 0,
2642                         cltv_expiry_delta: chan_3.0.contents.cltv_expiry_delta as u32
2643                 });
2644                 hops.push(RouteHop {
2645                         pubkey: nodes[3].node.get_our_node_id(),
2646                         short_channel_id: chan_3.0.contents.short_channel_id,
2647                         fee_msat: 0,
2648                         cltv_expiry_delta: chan_4.1.contents.cltv_expiry_delta as u32
2649                 });
2650                 hops.push(RouteHop {
2651                         pubkey: nodes[1].node.get_our_node_id(),
2652                         short_channel_id: chan_4.0.contents.short_channel_id,
2653                         fee_msat: 1000000,
2654                         cltv_expiry_delta: TEST_FINAL_CLTV,
2655                 });
2656                 hops[1].fee_msat = chan_4.1.contents.fee_base_msat as u64 + chan_4.1.contents.fee_proportional_millionths as u64 * hops[2].fee_msat as u64 / 1000000;
2657                 hops[0].fee_msat = chan_3.0.contents.fee_base_msat as u64 + chan_3.0.contents.fee_proportional_millionths as u64 * hops[1].fee_msat as u64 / 1000000;
2658                 let payment_preimage_1 = send_along_route(&nodes[1], Route { hops }, &vec!(&nodes[2], &nodes[3], &nodes[1])[..], 1000000).0;
2659
2660                 let mut hops = Vec::with_capacity(3);
2661                 hops.push(RouteHop {
2662                         pubkey: nodes[3].node.get_our_node_id(),
2663                         short_channel_id: chan_4.0.contents.short_channel_id,
2664                         fee_msat: 0,
2665                         cltv_expiry_delta: chan_3.1.contents.cltv_expiry_delta as u32
2666                 });
2667                 hops.push(RouteHop {
2668                         pubkey: nodes[2].node.get_our_node_id(),
2669                         short_channel_id: chan_3.0.contents.short_channel_id,
2670                         fee_msat: 0,
2671                         cltv_expiry_delta: chan_2.1.contents.cltv_expiry_delta as u32
2672                 });
2673                 hops.push(RouteHop {
2674                         pubkey: nodes[1].node.get_our_node_id(),
2675                         short_channel_id: chan_2.0.contents.short_channel_id,
2676                         fee_msat: 1000000,
2677                         cltv_expiry_delta: TEST_FINAL_CLTV,
2678                 });
2679                 hops[1].fee_msat = chan_2.1.contents.fee_base_msat as u64 + chan_2.1.contents.fee_proportional_millionths as u64 * hops[2].fee_msat as u64 / 1000000;
2680                 hops[0].fee_msat = chan_3.1.contents.fee_base_msat as u64 + chan_3.1.contents.fee_proportional_millionths as u64 * hops[1].fee_msat as u64 / 1000000;
2681                 let payment_hash_2 = send_along_route(&nodes[1], Route { hops }, &vec!(&nodes[3], &nodes[2], &nodes[1])[..], 1000000).1;
2682
2683                 // Claim the rebalances...
2684                 fail_payment(&nodes[1], &vec!(&nodes[3], &nodes[2], &nodes[1])[..], payment_hash_2);
2685                 claim_payment(&nodes[1], &vec!(&nodes[2], &nodes[3], &nodes[1])[..], payment_preimage_1);
2686
2687                 // Add a duplicate new channel from 2 to 4
2688                 let chan_5 = create_announced_chan_between_nodes(&nodes, 1, 3);
2689
2690                 // Send some payments across both channels
2691                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2692                 let payment_preimage_4 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2693                 let payment_preimage_5 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2694
2695                 route_over_limit(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000);
2696
2697                 //TODO: Test that routes work again here as we've been notified that the channel is full
2698
2699                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_3);
2700                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_4);
2701                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_5);
2702
2703                 // Close down the channels...
2704                 close_channel(&nodes[0], &nodes[1], &chan_1.2, chan_1.3, true);
2705                 close_channel(&nodes[1], &nodes[2], &chan_2.2, chan_2.3, false);
2706                 close_channel(&nodes[2], &nodes[3], &chan_3.2, chan_3.3, true);
2707                 close_channel(&nodes[1], &nodes[3], &chan_4.2, chan_4.3, false);
2708                 close_channel(&nodes[1], &nodes[3], &chan_5.2, chan_5.3, false);
2709
2710                 // Check that we processed all pending events
2711                 for node in nodes {
2712                         assert_eq!(node.node.get_and_clear_pending_events().len(), 0);
2713                         assert_eq!(node.chan_monitor.added_monitors.lock().unwrap().len(), 0);
2714                 }
2715         }
2716
2717         #[derive(PartialEq)]
2718         enum HTLCType { NONE, TIMEOUT, SUCCESS }
2719         fn test_txn_broadcast(node: &Node, chan: &(msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction), commitment_tx: Option<Transaction>, has_htlc_tx: HTLCType) -> Vec<Transaction> {
2720                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
2721                 assert!(node_txn.len() >= if commitment_tx.is_some() { 0 } else { 1 } + if has_htlc_tx == HTLCType::NONE { 0 } else { 1 });
2722
2723                 let mut res = Vec::with_capacity(2);
2724
2725                 if let Some(explicit_tx) = commitment_tx {
2726                         res.push(explicit_tx.clone());
2727                 } else {
2728                         for tx in node_txn.iter() {
2729                                 if tx.input.len() == 1 && tx.input[0].prev_hash == chan.3.txid() {
2730                                         let mut funding_tx_map = HashMap::new();
2731                                         funding_tx_map.insert(chan.3.txid(), chan.3.clone());
2732                                         tx.verify(&funding_tx_map).unwrap();
2733                                         res.push(tx.clone());
2734                                 }
2735                         }
2736                 }
2737                 assert_eq!(res.len(), 1);
2738
2739                 if has_htlc_tx != HTLCType::NONE {
2740                         for tx in node_txn.iter() {
2741                                 if tx.input.len() == 1 && tx.input[0].prev_hash == res[0].txid() {
2742                                         let mut funding_tx_map = HashMap::new();
2743                                         funding_tx_map.insert(res[0].txid(), res[0].clone());
2744                                         tx.verify(&funding_tx_map).unwrap();
2745                                         if has_htlc_tx == HTLCType::TIMEOUT {
2746                                                 assert!(tx.lock_time != 0);
2747                                         } else {
2748                                                 assert!(tx.lock_time == 0);
2749                                         }
2750                                         res.push(tx.clone());
2751                                         break;
2752                                 }
2753                         }
2754                         assert_eq!(res.len(), 2);
2755                 }
2756                 node_txn.clear();
2757                 res
2758         }
2759
2760         fn check_preimage_claim(node: &Node, prev_txn: &Vec<Transaction>) -> Vec<Transaction> {
2761                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
2762
2763                 assert!(node_txn.len() >= 1);
2764                 assert_eq!(node_txn[0].input.len(), 1);
2765                 let mut found_prev = false;
2766
2767                 for tx in prev_txn {
2768                         if node_txn[0].input[0].prev_hash == tx.txid() {
2769                                 let mut funding_tx_map = HashMap::new();
2770                                 funding_tx_map.insert(tx.txid(), tx.clone());
2771                                 node_txn[0].verify(&funding_tx_map).unwrap();
2772
2773                                 assert!(node_txn[0].input[0].witness[2].len() > 106); // must spend an htlc output
2774                                 assert_eq!(tx.input.len(), 1); // must spend a commitment tx
2775
2776                                 found_prev = true;
2777                                 break;
2778                         }
2779                 }
2780                 assert!(found_prev);
2781
2782                 let mut res = Vec::new();
2783                 mem::swap(&mut *node_txn, &mut res);
2784                 res
2785         }
2786
2787         fn get_announce_close_broadcast_events(nodes: &Vec<Node>, a: usize, b: usize) {
2788                 let events_1 = nodes[a].node.get_and_clear_pending_events();
2789                 assert_eq!(events_1.len(), 1);
2790                 let as_update = match events_1[0] {
2791                         Event::BroadcastChannelUpdate { ref msg } => {
2792                                 msg.clone()
2793                         },
2794                         _ => panic!("Unexpected event"),
2795                 };
2796
2797                 let events_2 = nodes[b].node.get_and_clear_pending_events();
2798                 assert_eq!(events_2.len(), 1);
2799                 let bs_update = match events_2[0] {
2800                         Event::BroadcastChannelUpdate { ref msg } => {
2801                                 msg.clone()
2802                         },
2803                         _ => panic!("Unexpected event"),
2804                 };
2805
2806                 for node in nodes {
2807                         node.router.handle_channel_update(&as_update).unwrap();
2808                         node.router.handle_channel_update(&bs_update).unwrap();
2809                 }
2810         }
2811
2812         #[test]
2813         fn channel_monitor_network_test() {
2814                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
2815                 // tests that ChannelMonitor is able to recover from various states.
2816                 let nodes = create_network(5);
2817
2818                 // Create some initial channels
2819                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
2820                 let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2);
2821                 let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3);
2822                 let chan_4 = create_announced_chan_between_nodes(&nodes, 3, 4);
2823
2824                 // Rebalance the network a bit by relaying one payment through all the channels...
2825                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2826                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2827                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2828                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2829
2830                 // Simple case with no pending HTLCs:
2831                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), true);
2832                 {
2833                         let mut node_txn = test_txn_broadcast(&nodes[1], &chan_1, None, HTLCType::NONE);
2834                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2835                         nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn.drain(..).next().unwrap()] }, 1);
2836                         assert_eq!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().len(), 0);
2837                 }
2838                 get_announce_close_broadcast_events(&nodes, 0, 1);
2839                 assert_eq!(nodes[0].node.list_channels().len(), 0);
2840                 assert_eq!(nodes[1].node.list_channels().len(), 1);
2841
2842                 // One pending HTLC is discarded by the force-close:
2843                 let payment_preimage_1 = route_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 3000000).0;
2844
2845                 // Simple case of one pending HTLC to HTLC-Timeout
2846                 nodes[1].node.peer_disconnected(&nodes[2].node.get_our_node_id(), true);
2847                 {
2848                         let mut node_txn = test_txn_broadcast(&nodes[1], &chan_2, None, HTLCType::TIMEOUT);
2849                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2850                         nodes[2].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn.drain(..).next().unwrap()] }, 1);
2851                         assert_eq!(nodes[2].tx_broadcaster.txn_broadcasted.lock().unwrap().len(), 0);
2852                 }
2853                 get_announce_close_broadcast_events(&nodes, 1, 2);
2854                 assert_eq!(nodes[1].node.list_channels().len(), 0);
2855                 assert_eq!(nodes[2].node.list_channels().len(), 1);
2856
2857                 macro_rules! claim_funds {
2858                         ($node: expr, $prev_node: expr, $preimage: expr) => {
2859                                 {
2860                                         assert!($node.node.claim_funds($preimage));
2861                                         {
2862                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2863                                                 assert_eq!(added_monitors.len(), 1);
2864                                                 added_monitors.clear();
2865                                         }
2866
2867                                         let events = $node.node.get_and_clear_pending_events();
2868                                         assert_eq!(events.len(), 1);
2869                                         match events[0] {
2870                                                 Event::SendFulfillHTLC { ref node_id, .. } => {
2871                                                         assert_eq!(*node_id, $prev_node.node.get_our_node_id());
2872                                                 },
2873                                                 _ => panic!("Unexpected event"),
2874                                         };
2875                                 }
2876                         }
2877                 }
2878
2879                 // nodes[3] gets the preimage, but nodes[2] already disconnected, resulting in a nodes[2]
2880                 // HTLC-Timeout and a nodes[3] claim against it (+ its own announces)
2881                 nodes[2].node.peer_disconnected(&nodes[3].node.get_our_node_id(), true);
2882                 {
2883                         let node_txn = test_txn_broadcast(&nodes[2], &chan_3, None, HTLCType::TIMEOUT);
2884
2885                         // Claim the payment on nodes[3], giving it knowledge of the preimage
2886                         claim_funds!(nodes[3], nodes[2], payment_preimage_1);
2887
2888                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2889                         nodes[3].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[0].clone()] }, 1);
2890
2891                         check_preimage_claim(&nodes[3], &node_txn);
2892                 }
2893                 get_announce_close_broadcast_events(&nodes, 2, 3);
2894                 assert_eq!(nodes[2].node.list_channels().len(), 0);
2895                 assert_eq!(nodes[3].node.list_channels().len(), 1);
2896
2897                 // One pending HTLC to time out:
2898                 let payment_preimage_2 = route_payment(&nodes[3], &vec!(&nodes[4])[..], 3000000).0;
2899
2900                 {
2901                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2902                         nodes[3].chain_monitor.block_connected_checked(&header, 1, &Vec::new()[..], &[0; 0]);
2903                         for i in 2..TEST_FINAL_CLTV - 5 {
2904                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2905                                 nodes[3].chain_monitor.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
2906                         }
2907
2908                         let node_txn = test_txn_broadcast(&nodes[3], &chan_4, None, HTLCType::TIMEOUT);
2909
2910                         // Claim the payment on nodes[3], giving it knowledge of the preimage
2911                         claim_funds!(nodes[4], nodes[3], payment_preimage_2);
2912
2913                         header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2914                         nodes[4].chain_monitor.block_connected_checked(&header, 1, &Vec::new()[..], &[0; 0]);
2915                         for i in 2..TEST_FINAL_CLTV - 5 {
2916                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2917                                 nodes[4].chain_monitor.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
2918                         }
2919
2920                         test_txn_broadcast(&nodes[4], &chan_4, None, HTLCType::SUCCESS);
2921
2922                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2923                         nodes[4].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[0].clone()] }, TEST_FINAL_CLTV - 5);
2924
2925                         check_preimage_claim(&nodes[4], &node_txn);
2926                 }
2927                 get_announce_close_broadcast_events(&nodes, 3, 4);
2928                 assert_eq!(nodes[3].node.list_channels().len(), 0);
2929                 assert_eq!(nodes[4].node.list_channels().len(), 0);
2930
2931                 // Create some new channels:
2932                 let chan_5 = create_announced_chan_between_nodes(&nodes, 0, 1);
2933
2934                 // A pending HTLC which will be revoked:
2935                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
2936                 // Get the will-be-revoked local txn from nodes[0]
2937                 let revoked_local_txn = nodes[0].node.channel_state.lock().unwrap().by_id.iter().next().unwrap().1.last_local_commitment_txn.clone();
2938                 // Revoke the old state
2939                 claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage_3);
2940
2941                 {
2942                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2943                         nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
2944                         {
2945                                 let mut node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
2946                                 assert_eq!(node_txn.len(), 1);
2947                                 assert_eq!(node_txn[0].input.len(), 1);
2948
2949                                 let mut funding_tx_map = HashMap::new();
2950                                 funding_tx_map.insert(revoked_local_txn[0].txid(), revoked_local_txn[0].clone());
2951                                 node_txn[0].verify(&funding_tx_map).unwrap();
2952                                 node_txn.clear();
2953                         }
2954
2955                         nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
2956                         let node_txn = test_txn_broadcast(&nodes[0], &chan_5, Some(revoked_local_txn[0].clone()), HTLCType::TIMEOUT);
2957                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2958                         nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[1].clone()] }, 1);
2959
2960                         //TODO: At this point nodes[1] should claim the revoked HTLC-Timeout output, but that's
2961                         //not yet implemented in ChannelMonitor
2962                 }
2963                 get_announce_close_broadcast_events(&nodes, 0, 1);
2964                 assert_eq!(nodes[0].node.list_channels().len(), 0);
2965                 assert_eq!(nodes[1].node.list_channels().len(), 0);
2966
2967                 // Check that we processed all pending events
2968                 for node in nodes {
2969                         assert_eq!(node.node.get_and_clear_pending_events().len(), 0);
2970                         assert_eq!(node.chan_monitor.added_monitors.lock().unwrap().len(), 0);
2971                 }
2972         }
2973
2974         #[test]
2975         fn test_unconf_chan() {
2976                 // After creating a chan between nodes, we disconnect all blocks previously seen to force a channel close on nodes[0] side
2977                 let nodes = create_network(2);
2978                 create_announced_chan_between_nodes(&nodes, 0, 1);
2979
2980                 let channel_state = nodes[0].node.channel_state.lock().unwrap();
2981                 assert_eq!(channel_state.by_id.len(), 1);
2982                 assert_eq!(channel_state.short_to_id.len(), 1);
2983                 mem::drop(channel_state);
2984
2985                 let mut headers = Vec::new();
2986                 let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2987                 headers.push(header.clone());
2988                 for _i in 2..100 {
2989                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2990                         headers.push(header.clone());
2991                 }
2992                 while !headers.is_empty() {
2993                         nodes[0].node.block_disconnected(&headers.pop().unwrap());
2994                 }
2995                 let channel_state = nodes[0].node.channel_state.lock().unwrap();
2996                 assert_eq!(channel_state.by_id.len(), 0);
2997                 assert_eq!(channel_state.short_to_id.len(), 0);
2998         }
2999 }