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

   1 //! The top-level channel management and payment tracking stuff lives here.
   2 //! The ChannelManager is the main chunk of logic implementing the lightning protocol and is
   3 //! responsible for tracking which channels are open, HTLCs are in flight and reestablishing those
   4 //! upon reconnect to the relevant peer(s).
   5 //! It does not manage routing logic (see ln::router for that) nor does it manage constructing
   6 //! on-chain transactions (it only monitors the chain to watch for any force-closes that might
   7 //! imply it needs to fail HTLCs/payments/channels it manages).
   8
   9 use bitcoin::blockdata::block::BlockHeader;
  10 use bitcoin::blockdata::transaction::Transaction;
  11 use bitcoin::blockdata::constants::genesis_block;
  12 use bitcoin::network::constants::Network;
  13 use bitcoin::network::serialize::BitcoinHash;
  14 use bitcoin::util::hash::Sha256dHash;
  15
  16 use secp256k1::key::{SecretKey,PublicKey};
  17 use secp256k1::{Secp256k1,Message};
  18 use secp256k1::ecdh::SharedSecret;
  19 use secp256k1;
  20
  21 use chain::chaininterface::{BroadcasterInterface,ChainListener,ChainWatchInterface,FeeEstimator};
  22 use chain::transaction::OutPoint;
  23 use ln::channel::{Channel, ChannelKeys};
  24 use ln::channelmonitor::ManyChannelMonitor;
  25 use ln::router::{Route,RouteHop};
  26 use ln::msgs;
  27 use ln::msgs::{HandleError,ChannelMessageHandler};
  28 use util::{byte_utils, events, internal_traits, rng};
  29 use util::sha2::Sha256;
  30 use util::ser::{Readable, Writeable};
  31 use util::chacha20poly1305rfc::ChaCha20;
  32 use util::logger::Logger;
  33 use util::errors::APIError;
  34
  35 use crypto;
  36 use crypto::mac::{Mac,MacResult};
  37 use crypto::hmac::Hmac;
  38 use crypto::digest::Digest;
  39 use crypto::symmetriccipher::SynchronousStreamCipher;
  40
  41 use std::{ptr, mem};
  42 use std::collections::HashMap;
  43 use std::collections::hash_map;
  44 use std::io::Cursor;
  45 use std::sync::{Mutex,MutexGuard,Arc};
  46 use std::sync::atomic::{AtomicUsize, Ordering};
  47 use std::time::{Instant,Duration};
  48
  49 /// We hold various information about HTLC relay in the HTLC objects in Channel itself:
  50 ///
  51 /// Upon receipt of an HTLC from a peer, we'll give it a PendingHTLCStatus indicating if it should
  52 /// forward the HTLC with information it will give back to us when it does so, or if it should Fail
  53 /// the HTLC with the relevant message for the Channel to handle giving to the remote peer.
  54 ///
  55 /// When a Channel forwards an HTLC to its peer, it will give us back the PendingForwardHTLCInfo
  56 /// which we will use to construct an outbound HTLC, with a relevant HTLCSource::PreviousHopData
  57 /// filled in to indicate where it came from (which we can use to either fail-backwards or fulfill
  58 /// the HTLC backwards along the relevant path).
  59 /// Alternatively, we can fill an outbound HTLC with a HTLCSource::OutboundRoute indicating this is
  60 /// our payment, which we can use to decode errors or inform the user that the payment was sent.
  61 mod channel_held_info {
  62         use ln::msgs;
  63         use ln::router::Route;
  64         use secp256k1::key::SecretKey;
  65         use secp256k1::ecdh::SharedSecret;
  66
  67         /// Stores the info we will need to send when we want to forward an HTLC onwards
  68         #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
  69         pub struct PendingForwardHTLCInfo {
  70                 pub(super) onion_packet: Option<msgs::OnionPacket>,
  71                 pub(super) incoming_shared_secret: SharedSecret,
  72                 pub(super) payment_hash: [u8; 32],
  73                 pub(super) short_channel_id: u64,
  74                 pub(super) amt_to_forward: u64,
  75                 pub(super) outgoing_cltv_value: u32,
  76         }
  77
  78         #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
  79         pub enum HTLCFailureMsg {
  80                 Relay(msgs::UpdateFailHTLC),
  81                 Malformed(msgs::UpdateFailMalformedHTLC),
  82         }
  83
  84         /// Stores whether we can't forward an HTLC or relevant forwarding info
  85         #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
  86         pub enum PendingHTLCStatus {
  87                 Forward(PendingForwardHTLCInfo),
  88                 Fail(HTLCFailureMsg),
  89         }
  90
  91         /// Tracks the inbound corresponding to an outbound HTLC
  92         #[derive(Clone)]
  93         pub struct HTLCPreviousHopData {
  94                 pub(super) short_channel_id: u64,
  95                 pub(super) htlc_id: u64,
  96                 pub(super) incoming_packet_shared_secret: SharedSecret,
  97         }
  98
  99         /// Tracks the inbound corresponding to an outbound HTLC
 100         #[derive(Clone)]
 101         pub enum HTLCSource {
 102                 PreviousHopData(HTLCPreviousHopData),
 103                 OutboundRoute {
 104                         route: Route,
 105                         session_priv: SecretKey,
 106                 },
 107         }
 108         #[cfg(test)]
 109         impl HTLCSource {
 110                 pub fn dummy() -> Self {
 111                         HTLCSource::OutboundRoute {
 112                                 route: Route { hops: Vec::new() },
 113                                 session_priv: SecretKey::from_slice(&::secp256k1::Secp256k1::without_caps(), &[1; 32]).unwrap(),
 114                         }
 115                 }
 116         }
 117
 118         #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
 119         pub(crate) enum HTLCFailReason {
 120                 ErrorPacket {
 121                         err: msgs::OnionErrorPacket,
 122                 },
 123                 Reason {
 124                         failure_code: u16,
 125                         data: Vec<u8>,
 126                 }
 127         }
 128 }
 129 pub(super) use self::channel_held_info::*;
 130
 131 struct MsgHandleErrInternal {
 132         err: msgs::HandleError,
 133         needs_channel_force_close: bool,
 134 }
 135 impl MsgHandleErrInternal {
 136         #[inline]
 137         fn send_err_msg_no_close(err: &'static str, channel_id: [u8; 32]) -> Self {
 138                 Self {
 139                         err: HandleError {
 140                                 err,
 141                                 action: Some(msgs::ErrorAction::SendErrorMessage {
 142                                         msg: msgs::ErrorMessage {
 143                                                 channel_id,
 144                                                 data: err.to_string()
 145                                         },
 146                                 }),
 147                         },
 148                         needs_channel_force_close: false,
 149                 }
 150         }
 151         #[inline]
 152         fn send_err_msg_close_chan(err: &'static str, channel_id: [u8; 32]) -> Self {
 153                 Self {
 154                         err: HandleError {
 155                                 err,
 156                                 action: Some(msgs::ErrorAction::SendErrorMessage {
 157                                         msg: msgs::ErrorMessage {
 158                                                 channel_id,
 159                                                 data: err.to_string()
 160                                         },
 161                                 }),
 162                         },
 163                         needs_channel_force_close: true,
 164                 }
 165         }
 166         #[inline]
 167         fn from_maybe_close(err: msgs::HandleError) -> Self {
 168                 Self { err, needs_channel_force_close: true }
 169         }
 170         #[inline]
 171         fn from_no_close(err: msgs::HandleError) -> Self {
 172                 Self { err, needs_channel_force_close: false }
 173         }
 174 }
 175
 176 /// We hold back HTLCs we intend to relay for a random interval in the range (this, 5*this). This
 177 /// provides some limited amount of privacy. Ideally this would range from somewhere like 1 second
 178 /// to 30 seconds, but people expect lightning to be, you know, kinda fast, sadly. We could
 179 /// probably increase this significantly.
 180 const MIN_HTLC_RELAY_HOLDING_CELL_MILLIS: u32 = 50;
 181
 182 struct HTLCForwardInfo {
 183         prev_short_channel_id: u64,
 184         prev_htlc_id: u64,
 185         forward_info: PendingForwardHTLCInfo,
 186 }
 187
 188 struct ChannelHolder {
 189         by_id: HashMap<[u8; 32], Channel>,
 190         short_to_id: HashMap<u64, [u8; 32]>,
 191         next_forward: Instant,
 192         /// short channel id -> forward infos. Key of 0 means payments received
 193         /// Note that while this is held in the same mutex as the channels themselves, no consistency
 194         /// guarantees are made about there existing a channel with the short id here, nor the short
 195         /// ids in the PendingForwardHTLCInfo!
 196         forward_htlcs: HashMap<u64, Vec<HTLCForwardInfo>>,
 197         /// Note that while this is held in the same mutex as the channels themselves, no consistency
 198         /// guarantees are made about the channels given here actually existing anymore by the time you
 199         /// go to read them!
 200         claimable_htlcs: HashMap<[u8; 32], Vec<HTLCPreviousHopData>>,
 201 }
 202 struct MutChannelHolder<'a> {
 203         by_id: &'a mut HashMap<[u8; 32], Channel>,
 204         short_to_id: &'a mut HashMap<u64, [u8; 32]>,
 205         next_forward: &'a mut Instant,
 206         forward_htlcs: &'a mut HashMap<u64, Vec<HTLCForwardInfo>>,
 207         claimable_htlcs: &'a mut HashMap<[u8; 32], Vec<HTLCPreviousHopData>>,
 208 }
 209 impl ChannelHolder {
 210         fn borrow_parts(&mut self) -> MutChannelHolder {
 211                 MutChannelHolder {
 212                         by_id: &mut self.by_id,
 213                         short_to_id: &mut self.short_to_id,
 214                         next_forward: &mut self.next_forward,
 215                         forward_htlcs: &mut self.forward_htlcs,
 216                         claimable_htlcs: &mut self.claimable_htlcs,
 217                 }
 218         }
 219 }
 220
 221 #[cfg(not(any(target_pointer_width = "32", target_pointer_width = "64")))]
 222 const ERR: () = "You need at least 32 bit pointers (well, usize, but we'll assume they're the same) for ChannelManager::latest_block_height";
 223
 224 /// Manager which keeps track of a number of channels and sends messages to the appropriate
 225 /// channel, also tracking HTLC preimages and forwarding onion packets appropriately.
 226 /// Implements ChannelMessageHandler, handling the multi-channel parts and passing things through
 227 /// to individual Channels.
 228 pub struct ChannelManager {
 229         genesis_hash: Sha256dHash,
 230         fee_estimator: Arc<FeeEstimator>,
 231         monitor: Arc<ManyChannelMonitor>,
 232         chain_monitor: Arc<ChainWatchInterface>,
 233         tx_broadcaster: Arc<BroadcasterInterface>,
 234
 235         announce_channels_publicly: bool,
 236         fee_proportional_millionths: u32,
 237         latest_block_height: AtomicUsize,
 238         secp_ctx: Secp256k1<secp256k1::All>,
 239
 240         channel_state: Mutex<ChannelHolder>,
 241         our_network_key: SecretKey,
 242
 243         pending_events: Mutex<Vec<events::Event>>,
 244
 245         logger: Arc<Logger>,
 246 }
 247
 248 const CLTV_EXPIRY_DELTA: u16 = 6 * 24 * 2; //TODO?
 249
 250 macro_rules! secp_call {
 251         ( $res: expr, $err: expr ) => {
 252                 match $res {
 253                         Ok(key) => key,
 254                         Err(_) => return Err($err),
 255                 }
 256         };
 257 }
 258
 259 struct OnionKeys {
 260         #[cfg(test)]
 261         shared_secret: SharedSecret,
 262         #[cfg(test)]
 263         blinding_factor: [u8; 32],
 264         ephemeral_pubkey: PublicKey,
 265         rho: [u8; 32],
 266         mu: [u8; 32],
 267 }
 268
 269 /// Details of a channel, as returned by ChannelManager::list_channels and ChannelManager::list_usable_channels
 270 pub struct ChannelDetails {
 271         /// The channel's ID (prior to funding transaction generation, this is a random 32 bytes,
 272         /// thereafter this is the txid of the funding transaction xor the funding transaction output).
 273         /// Note that this means this value is *not* persistent - it can change once during the
 274         /// lifetime of the channel.
 275         pub channel_id: [u8; 32],
 276         /// The position of the funding transaction in the chain. None if the funding transaction has
 277         /// not yet been confirmed and the channel fully opened.
 278         pub short_channel_id: Option<u64>,
 279         /// The node_id of our counterparty
 280         pub remote_network_id: PublicKey,
 281         /// The value, in satoshis, of this channel as appears in the funding output
 282         pub channel_value_satoshis: u64,
 283         /// The user_id passed in to create_channel, or 0 if the channel was inbound.
 284         pub user_id: u64,
 285 }
 286
 287 impl ChannelManager {
 288         /// Constructs a new ChannelManager to hold several channels and route between them. This is
 289         /// the main "logic hub" for all channel-related actions, and implements ChannelMessageHandler.
 290         /// fee_proportional_millionths is an optional fee to charge any payments routed through us.
 291         /// Non-proportional fees are fixed according to our risk using the provided fee estimator.
 292         /// panics if channel_value_satoshis is >= `MAX_FUNDING_SATOSHIS`!
 293         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>, logger: Arc<Logger>) -> Result<Arc<ChannelManager>, secp256k1::Error> {
 294                 let secp_ctx = Secp256k1::new();
 295
 296                 let res = Arc::new(ChannelManager {
 297                         genesis_hash: genesis_block(network).header.bitcoin_hash(),
 298                         fee_estimator: feeest.clone(),
 299                         monitor: monitor.clone(),
 300                         chain_monitor,
 301                         tx_broadcaster,
 302
 303                         announce_channels_publicly,
 304                         fee_proportional_millionths,
 305                         latest_block_height: AtomicUsize::new(0), //TODO: Get an init value (generally need to replay recent chain on chain_monitor registration)
 306                         secp_ctx,
 307
 308                         channel_state: Mutex::new(ChannelHolder{
 309                                 by_id: HashMap::new(),
 310                                 short_to_id: HashMap::new(),
 311                                 next_forward: Instant::now(),
 312                                 forward_htlcs: HashMap::new(),
 313                                 claimable_htlcs: HashMap::new(),
 314                         }),
 315                         our_network_key,
 316
 317                         pending_events: Mutex::new(Vec::new()),
 318
 319                         logger,
 320                 });
 321                 let weak_res = Arc::downgrade(&res);
 322                 res.chain_monitor.register_listener(weak_res);
 323                 Ok(res)
 324         }
 325
 326         /// Creates a new outbound channel to the given remote node and with the given value.
 327         /// user_id will be provided back as user_channel_id in FundingGenerationReady and
 328         /// FundingBroadcastSafe events to allow tracking of which events correspond with which
 329         /// create_channel call. Note that user_channel_id defaults to 0 for inbound channels, so you
 330         /// may wish to avoid using 0 for user_id here.
 331         /// If successful, will generate a SendOpenChannel event, so you should probably poll
 332         /// PeerManager::process_events afterwards.
 333         /// Raises APIError::APIMisuseError when channel_value_satoshis > 2**24 or push_msat being greater than channel_value_satoshis * 1k
 334         pub fn create_channel(&self, their_network_key: PublicKey, channel_value_satoshis: u64, push_msat: u64, user_id: u64) -> Result<(), APIError> {
 335                 let chan_keys = if cfg!(feature = "fuzztarget") {
 336                         ChannelKeys {
 337                                 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(),
 338                                 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(),
 339                                 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(),
 340                                 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(),
 341                                 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(),
 342                                 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(),
 343                                 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(),
 344                                 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],
 345                         }
 346                 } else {
 347                         let mut key_seed = [0u8; 32];
 348                         rng::fill_bytes(&mut key_seed);
 349                         match ChannelKeys::new_from_seed(&key_seed) {
 350                                 Ok(key) => key,
 351                                 Err(_) => panic!("RNG is busted!")
 352                         }
 353                 };
 354
 355                 let channel = Channel::new_outbound(&*self.fee_estimator, chan_keys, their_network_key, channel_value_satoshis, push_msat, self.announce_channels_publicly, user_id, Arc::clone(&self.logger))?;
 356                 let res = channel.get_open_channel(self.genesis_hash.clone(), &*self.fee_estimator);
 357                 let mut channel_state = self.channel_state.lock().unwrap();
 358                 match channel_state.by_id.insert(channel.channel_id(), channel) {
 359                         Some(_) => panic!("RNG is bad???"),
 360                         None => {}
 361                 }
 362
 363                 let mut events = self.pending_events.lock().unwrap();
 364                 events.push(events::Event::SendOpenChannel {
 365                         node_id: their_network_key,
 366                         msg: res,
 367                 });
 368                 Ok(())
 369         }
 370
 371         /// Gets the list of open channels, in random order. See ChannelDetail field documentation for
 372         /// more information.
 373         pub fn list_channels(&self) -> Vec<ChannelDetails> {
 374                 let channel_state = self.channel_state.lock().unwrap();
 375                 let mut res = Vec::with_capacity(channel_state.by_id.len());
 376                 for (channel_id, channel) in channel_state.by_id.iter() {
 377                         res.push(ChannelDetails {
 378                                 channel_id: (*channel_id).clone(),
 379                                 short_channel_id: channel.get_short_channel_id(),
 380                                 remote_network_id: channel.get_their_node_id(),
 381                                 channel_value_satoshis: channel.get_value_satoshis(),
 382                                 user_id: channel.get_user_id(),
 383                         });
 384                 }
 385                 res
 386         }
 387
 388         /// Gets the list of usable channels, in random order. Useful as an argument to
 389         /// Router::get_route to ensure non-announced channels are used.
 390         pub fn list_usable_channels(&self) -> Vec<ChannelDetails> {
 391                 let channel_state = self.channel_state.lock().unwrap();
 392                 let mut res = Vec::with_capacity(channel_state.by_id.len());
 393                 for (channel_id, channel) in channel_state.by_id.iter() {
 394                         if channel.is_usable() {
 395                                 res.push(ChannelDetails {
 396                                         channel_id: (*channel_id).clone(),
 397                                         short_channel_id: channel.get_short_channel_id(),
 398                                         remote_network_id: channel.get_their_node_id(),
 399                                         channel_value_satoshis: channel.get_value_satoshis(),
 400                                         user_id: channel.get_user_id(),
 401                                 });
 402                         }
 403                 }
 404                 res
 405         }
 406
 407         /// Begins the process of closing a channel. After this call (plus some timeout), no new HTLCs
 408         /// will be accepted on the given channel, and after additional timeout/the closing of all
 409         /// pending HTLCs, the channel will be closed on chain.
 410         /// May generate a SendShutdown event on success, which should be relayed.
 411         pub fn close_channel(&self, channel_id: &[u8; 32]) -> Result<(), HandleError> {
 412                 let (mut res, node_id, chan_option) = {
 413                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 414                         let channel_state = channel_state_lock.borrow_parts();
 415                         match channel_state.by_id.entry(channel_id.clone()) {
 416                                 hash_map::Entry::Occupied(mut chan_entry) => {
 417                                         let res = chan_entry.get_mut().get_shutdown()?;
 418                                         if chan_entry.get().is_shutdown() {
 419                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
 420                                                         channel_state.short_to_id.remove(&short_id);
 421                                                 }
 422                                                 (res, chan_entry.get().get_their_node_id(), Some(chan_entry.remove_entry().1))
 423                                         } else { (res, chan_entry.get().get_their_node_id(), None) }
 424                                 },
 425                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "No such channel", action: None})
 426                         }
 427                 };
 428                 for htlc_source in res.1.drain(..) {
 429                         // unknown_next_peer...I dunno who that is anymore....
 430                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source.0, &htlc_source.1, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
 431                 }
 432                 let chan_update = if let Some(chan) = chan_option {
 433                         if let Ok(update) = self.get_channel_update(&chan) {
 434                                 Some(update)
 435                         } else { None }
 436                 } else { None };
 437
 438                 let mut events = self.pending_events.lock().unwrap();
 439                 if let Some(update) = chan_update {
 440                         events.push(events::Event::BroadcastChannelUpdate {
 441                                 msg: update
 442                         });
 443                 }
 444                 events.push(events::Event::SendShutdown {
 445                         node_id,
 446                         msg: res.0
 447                 });
 448
 449                 Ok(())
 450         }
 451
 452         #[inline]
 453         fn finish_force_close_channel(&self, shutdown_res: (Vec<Transaction>, Vec<(HTLCSource, [u8; 32])>)) {
 454                 let (local_txn, mut failed_htlcs) = shutdown_res;
 455                 for htlc_source in failed_htlcs.drain(..) {
 456                         // unknown_next_peer...I dunno who that is anymore....
 457                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source.0, &htlc_source.1, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
 458                 }
 459                 for tx in local_txn {
 460                         self.tx_broadcaster.broadcast_transaction(&tx);
 461                 }
 462                 //TODO: We need to have a way where outbound HTLC claims can result in us claiming the
 463                 //now-on-chain HTLC output for ourselves (and, thereafter, passing the HTLC backwards).
 464                 //TODO: We need to handle monitoring of pending offered HTLCs which just hit the chain and
 465                 //may be claimed, resulting in us claiming the inbound HTLCs (and back-failing after
 466                 //timeouts are hit and our claims confirm).
 467                 //TODO: In any case, we need to make sure we remove any pending htlc tracking (via
 468                 //fail_backwards or claim_funds) eventually for all HTLCs that were in the channel
 469         }
 470
 471         /// Force closes a channel, immediately broadcasting the latest local commitment transaction to
 472         /// the chain and rejecting new HTLCs on the given channel.
 473         pub fn force_close_channel(&self, channel_id: &[u8; 32]) {
 474                 let mut chan = {
 475                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 476                         let channel_state = channel_state_lock.borrow_parts();
 477                         if let Some(chan) = channel_state.by_id.remove(channel_id) {
 478                                 if let Some(short_id) = chan.get_short_channel_id() {
 479                                         channel_state.short_to_id.remove(&short_id);
 480                                 }
 481                                 chan
 482                         } else {
 483                                 return;
 484                         }
 485                 };
 486                 self.finish_force_close_channel(chan.force_shutdown());
 487                 let mut events = self.pending_events.lock().unwrap();
 488                 if let Ok(update) = self.get_channel_update(&chan) {
 489                         events.push(events::Event::BroadcastChannelUpdate {
 490                                 msg: update
 491                         });
 492                 }
 493         }
 494
 495         /// Force close all channels, immediately broadcasting the latest local commitment transaction
 496         /// for each to the chain and rejecting new HTLCs on each.
 497         pub fn force_close_all_channels(&self) {
 498                 for chan in self.list_channels() {
 499                         self.force_close_channel(&chan.channel_id);
 500                 }
 501         }
 502
 503         #[inline]
 504         fn gen_rho_mu_from_shared_secret(shared_secret: &SharedSecret) -> ([u8; 32], [u8; 32]) {
 505                 ({
 506                         let mut hmac = Hmac::new(Sha256::new(), &[0x72, 0x68, 0x6f]); // rho
 507                         hmac.input(&shared_secret[..]);
 508                         let mut res = [0; 32];
 509                         hmac.raw_result(&mut res);
 510                         res
 511                 },
 512                 {
 513                         let mut hmac = Hmac::new(Sha256::new(), &[0x6d, 0x75]); // mu
 514                         hmac.input(&shared_secret[..]);
 515                         let mut res = [0; 32];
 516                         hmac.raw_result(&mut res);
 517                         res
 518                 })
 519         }
 520
 521         #[inline]
 522         fn gen_um_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 523                 let mut hmac = Hmac::new(Sha256::new(), &[0x75, 0x6d]); // um
 524                 hmac.input(&shared_secret[..]);
 525                 let mut res = [0; 32];
 526                 hmac.raw_result(&mut res);
 527                 res
 528         }
 529
 530         #[inline]
 531         fn gen_ammag_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 532                 let mut hmac = Hmac::new(Sha256::new(), &[0x61, 0x6d, 0x6d, 0x61, 0x67]); // ammag
 533                 hmac.input(&shared_secret[..]);
 534                 let mut res = [0; 32];
 535                 hmac.raw_result(&mut res);
 536                 res
 537         }
 538
 539         // can only fail if an intermediary hop has an invalid public key or session_priv is invalid
 540         #[inline]
 541         fn construct_onion_keys_callback<T: secp256k1::Signing, FType: FnMut(SharedSecret, [u8; 32], PublicKey, &RouteHop)> (secp_ctx: &Secp256k1<T>, route: &Route, session_priv: &SecretKey, mut callback: FType) -> Result<(), secp256k1::Error> {
 542                 let mut blinded_priv = session_priv.clone();
 543                 let mut blinded_pub = PublicKey::from_secret_key(secp_ctx, &blinded_priv);
 544
 545                 for hop in route.hops.iter() {
 546                         let shared_secret = SharedSecret::new(secp_ctx, &hop.pubkey, &blinded_priv);
 547
 548                         let mut sha = Sha256::new();
 549                         sha.input(&blinded_pub.serialize()[..]);
 550                         sha.input(&shared_secret[..]);
 551                         let mut blinding_factor = [0u8; 32];
 552                         sha.result(&mut blinding_factor);
 553
 554                         let ephemeral_pubkey = blinded_pub;
 555
 556                         blinded_priv.mul_assign(secp_ctx, &SecretKey::from_slice(secp_ctx, &blinding_factor)?)?;
 557                         blinded_pub = PublicKey::from_secret_key(secp_ctx, &blinded_priv);
 558
 559                         callback(shared_secret, blinding_factor, ephemeral_pubkey, hop);
 560                 }
 561
 562                 Ok(())
 563         }
 564
 565         // can only fail if an intermediary hop has an invalid public key or session_priv is invalid
 566         fn construct_onion_keys<T: secp256k1::Signing>(secp_ctx: &Secp256k1<T>, route: &Route, session_priv: &SecretKey) -> Result<Vec<OnionKeys>, secp256k1::Error> {
 567                 let mut res = Vec::with_capacity(route.hops.len());
 568
 569                 Self::construct_onion_keys_callback(secp_ctx, route, session_priv, |shared_secret, _blinding_factor, ephemeral_pubkey, _| {
 570                         let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
 571
 572                         res.push(OnionKeys {
 573                                 #[cfg(test)]
 574                                 shared_secret,
 575                                 #[cfg(test)]
 576                                 blinding_factor: _blinding_factor,
 577                                 ephemeral_pubkey,
 578                                 rho,
 579                                 mu,
 580                         });
 581                 })?;
 582
 583                 Ok(res)
 584         }
 585
 586         /// returns the hop data, as well as the first-hop value_msat and CLTV value we should send.
 587         fn build_onion_payloads(route: &Route, starting_htlc_offset: u32) -> Result<(Vec<msgs::OnionHopData>, u64, u32), APIError> {
 588                 let mut cur_value_msat = 0u64;
 589                 let mut cur_cltv = starting_htlc_offset;
 590                 let mut last_short_channel_id = 0;
 591                 let mut res: Vec<msgs::OnionHopData> = Vec::with_capacity(route.hops.len());
 592                 internal_traits::test_no_dealloc::<msgs::OnionHopData>(None);
 593                 unsafe { res.set_len(route.hops.len()); }
 594
 595                 for (idx, hop) in route.hops.iter().enumerate().rev() {
 596                         // First hop gets special values so that it can check, on receipt, that everything is
 597                         // exactly as it should be (and the next hop isn't trying to probe to find out if we're
 598                         // the intended recipient).
 599                         let value_msat = if cur_value_msat == 0 { hop.fee_msat } else { cur_value_msat };
 600                         let cltv = if cur_cltv == starting_htlc_offset { hop.cltv_expiry_delta + starting_htlc_offset } else { cur_cltv };
 601                         res[idx] = msgs::OnionHopData {
 602                                 realm: 0,
 603                                 data: msgs::OnionRealm0HopData {
 604                                         short_channel_id: last_short_channel_id,
 605                                         amt_to_forward: value_msat,
 606                                         outgoing_cltv_value: cltv,
 607                                 },
 608                                 hmac: [0; 32],
 609                         };
 610                         cur_value_msat += hop.fee_msat;
 611                         if cur_value_msat >= 21000000 * 100000000 * 1000 {
 612                                 return Err(APIError::RouteError{err: "Channel fees overflowed?!"});
 613                         }
 614                         cur_cltv += hop.cltv_expiry_delta as u32;
 615                         if cur_cltv >= 500000000 {
 616                                 return Err(APIError::RouteError{err: "Channel CLTV overflowed?!"});
 617                         }
 618                         last_short_channel_id = hop.short_channel_id;
 619                 }
 620                 Ok((res, cur_value_msat, cur_cltv))
 621         }
 622
 623         #[inline]
 624         fn shift_arr_right(arr: &mut [u8; 20*65]) {
 625                 unsafe {
 626                         ptr::copy(arr[0..].as_ptr(), arr[65..].as_mut_ptr(), 19*65);
 627                 }
 628                 for i in 0..65 {
 629                         arr[i] = 0;
 630                 }
 631         }
 632
 633         #[inline]
 634         fn xor_bufs(dst: &mut[u8], src: &[u8]) {
 635                 assert_eq!(dst.len(), src.len());
 636
 637                 for i in 0..dst.len() {
 638                         dst[i] ^= src[i];
 639                 }
 640         }
 641
 642         const ZERO:[u8; 21*65] = [0; 21*65];
 643         fn construct_onion_packet(mut payloads: Vec<msgs::OnionHopData>, onion_keys: Vec<OnionKeys>, associated_data: &[u8; 32]) -> msgs::OnionPacket {
 644                 let mut buf = Vec::with_capacity(21*65);
 645                 buf.resize(21*65, 0);
 646
 647                 let filler = {
 648                         let iters = payloads.len() - 1;
 649                         let end_len = iters * 65;
 650                         let mut res = Vec::with_capacity(end_len);
 651                         res.resize(end_len, 0);
 652
 653                         for (i, keys) in onion_keys.iter().enumerate() {
 654                                 if i == payloads.len() - 1 { continue; }
 655                                 let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 656                                 chacha.process(&ChannelManager::ZERO, &mut buf); // We don't have a seek function :(
 657                                 ChannelManager::xor_bufs(&mut res[0..(i + 1)*65], &buf[(20 - i)*65..21*65]);
 658                         }
 659                         res
 660                 };
 661
 662                 let mut packet_data = [0; 20*65];
 663                 let mut hmac_res = [0; 32];
 664
 665                 for (i, (payload, keys)) in payloads.iter_mut().zip(onion_keys.iter()).rev().enumerate() {
 666                         ChannelManager::shift_arr_right(&mut packet_data);
 667                         payload.hmac = hmac_res;
 668                         packet_data[0..65].copy_from_slice(&payload.encode()[..]);
 669
 670                         let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 671                         chacha.process(&packet_data, &mut buf[0..20*65]);
 672                         packet_data[..].copy_from_slice(&buf[0..20*65]);
 673
 674                         if i == 0 {
 675                                 packet_data[20*65 - filler.len()..20*65].copy_from_slice(&filler[..]);
 676                         }
 677
 678                         let mut hmac = Hmac::new(Sha256::new(), &keys.mu);
 679                         hmac.input(&packet_data);
 680                         hmac.input(&associated_data[..]);
 681                         hmac.raw_result(&mut hmac_res);
 682                 }
 683
 684                 msgs::OnionPacket{
 685                         version: 0,
 686                         public_key: Ok(onion_keys.first().unwrap().ephemeral_pubkey),
 687                         hop_data: packet_data,
 688                         hmac: hmac_res,
 689                 }
 690         }
 691
 692         /// Encrypts a failure packet. raw_packet can either be a
 693         /// msgs::DecodedOnionErrorPacket.encode() result or a msgs::OnionErrorPacket.data element.
 694         fn encrypt_failure_packet(shared_secret: &SharedSecret, raw_packet: &[u8]) -> msgs::OnionErrorPacket {
 695                 let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
 696
 697                 let mut packet_crypted = Vec::with_capacity(raw_packet.len());
 698                 packet_crypted.resize(raw_packet.len(), 0);
 699                 let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
 700                 chacha.process(&raw_packet, &mut packet_crypted[..]);
 701                 msgs::OnionErrorPacket {
 702                         data: packet_crypted,
 703                 }
 704         }
 705
 706         fn build_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::DecodedOnionErrorPacket {
 707                 assert!(failure_data.len() <= 256 - 2);
 708
 709                 let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
 710
 711                 let failuremsg = {
 712                         let mut res = Vec::with_capacity(2 + failure_data.len());
 713                         res.push(((failure_type >> 8) & 0xff) as u8);
 714                         res.push(((failure_type >> 0) & 0xff) as u8);
 715                         res.extend_from_slice(&failure_data[..]);
 716                         res
 717                 };
 718                 let pad = {
 719                         let mut res = Vec::with_capacity(256 - 2 - failure_data.len());
 720                         res.resize(256 - 2 - failure_data.len(), 0);
 721                         res
 722                 };
 723                 let mut packet = msgs::DecodedOnionErrorPacket {
 724                         hmac: [0; 32],
 725                         failuremsg: failuremsg,
 726                         pad: pad,
 727                 };
 728
 729                 let mut hmac = Hmac::new(Sha256::new(), &um);
 730                 hmac.input(&packet.encode()[32..]);
 731                 hmac.raw_result(&mut packet.hmac);
 732
 733                 packet
 734         }
 735
 736         #[inline]
 737         fn build_first_hop_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::OnionErrorPacket {
 738                 let failure_packet = ChannelManager::build_failure_packet(shared_secret, failure_type, failure_data);
 739                 ChannelManager::encrypt_failure_packet(shared_secret, &failure_packet.encode()[..])
 740         }
 741
 742         fn decode_update_add_htlc_onion(&self, msg: &msgs::UpdateAddHTLC) -> (PendingHTLCStatus, MutexGuard<ChannelHolder>) {
 743                 macro_rules! get_onion_hash {
 744                         () => {
 745                                 {
 746                                         let mut sha = Sha256::new();
 747                                         sha.input(&msg.onion_routing_packet.hop_data);
 748                                         let mut onion_hash = [0; 32];
 749                                         sha.result(&mut onion_hash);
 750                                         onion_hash
 751                                 }
 752                         }
 753                 }
 754
 755                 if let Err(_) = msg.onion_routing_packet.public_key {
 756                         log_info!(self, "Failed to accept/forward incoming HTLC with invalid ephemeral pubkey");
 757                         return (PendingHTLCStatus::Fail(HTLCFailureMsg::Malformed(msgs::UpdateFailMalformedHTLC {
 758                                 channel_id: msg.channel_id,
 759                                 htlc_id: msg.htlc_id,
 760                                 sha256_of_onion: get_onion_hash!(),
 761                                 failure_code: 0x8000 | 0x4000 | 6,
 762                         })), self.channel_state.lock().unwrap());
 763                 }
 764
 765                 let shared_secret = SharedSecret::new(&self.secp_ctx, &msg.onion_routing_packet.public_key.unwrap(), &self.our_network_key);
 766                 let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
 767
 768                 let mut channel_state = None;
 769                 macro_rules! return_err {
 770                         ($msg: expr, $err_code: expr, $data: expr) => {
 771                                 {
 772                                         log_info!(self, "Failed to accept/forward incoming HTLC: {}", $msg);
 773                                         if channel_state.is_none() {
 774                                                 channel_state = Some(self.channel_state.lock().unwrap());
 775                                         }
 776                                         return (PendingHTLCStatus::Fail(HTLCFailureMsg::Relay(msgs::UpdateFailHTLC {
 777                                                 channel_id: msg.channel_id,
 778                                                 htlc_id: msg.htlc_id,
 779                                                 reason: ChannelManager::build_first_hop_failure_packet(&shared_secret, $err_code, $data),
 780                                         })), channel_state.unwrap());
 781                                 }
 782                         }
 783                 }
 784
 785                 if msg.onion_routing_packet.version != 0 {
 786                         //TODO: Spec doesn't indicate if we should only hash hop_data here (and in other
 787                         //sha256_of_onion error data packets), or the entire onion_routing_packet. Either way,
 788                         //the hash doesn't really serve any purpuse - in the case of hashing all data, the
 789                         //receiving node would have to brute force to figure out which version was put in the
 790                         //packet by the node that send us the message, in the case of hashing the hop_data, the
 791                         //node knows the HMAC matched, so they already know what is there...
 792                         return_err!("Unknown onion packet version", 0x8000 | 0x4000 | 4, &get_onion_hash!());
 793                 }
 794
 795                 let mut hmac = Hmac::new(Sha256::new(), &mu);
 796                 hmac.input(&msg.onion_routing_packet.hop_data);
 797                 hmac.input(&msg.payment_hash);
 798                 if hmac.result() != MacResult::new(&msg.onion_routing_packet.hmac) {
 799                         return_err!("HMAC Check failed", 0x8000 | 0x4000 | 5, &get_onion_hash!());
 800                 }
 801
 802                 let mut chacha = ChaCha20::new(&rho, &[0u8; 8]);
 803                 let next_hop_data = {
 804                         let mut decoded = [0; 65];
 805                         chacha.process(&msg.onion_routing_packet.hop_data[0..65], &mut decoded);
 806                         match msgs::OnionHopData::read(&mut Cursor::new(&decoded[..])) {
 807                                 Err(err) => {
 808                                         let error_code = match err {
 809                                                 msgs::DecodeError::UnknownRealmByte => 0x4000 | 1,
 810                                                 _ => 0x2000 | 2, // Should never happen
 811                                         };
 812                                         return_err!("Unable to decode our hop data", error_code, &[0;0]);
 813                                 },
 814                                 Ok(msg) => msg
 815                         }
 816                 };
 817
 818                 //TODO: Check that msg.cltv_expiry is within acceptable bounds!
 819
 820                 let pending_forward_info = if next_hop_data.hmac == [0; 32] {
 821                                 // OUR PAYMENT!
 822                                 if next_hop_data.data.amt_to_forward != msg.amount_msat {
 823                                         return_err!("Upstream node sent less than we were supposed to receive in payment", 19, &byte_utils::be64_to_array(msg.amount_msat));
 824                                 }
 825                                 if next_hop_data.data.outgoing_cltv_value != msg.cltv_expiry {
 826                                         return_err!("Upstream node set CLTV to the wrong value", 18, &byte_utils::be32_to_array(msg.cltv_expiry));
 827                                 }
 828
 829                                 // Note that we could obviously respond immediately with an update_fulfill_htlc
 830                                 // message, however that would leak that we are the recipient of this payment, so
 831                                 // instead we stay symmetric with the forwarding case, only responding (after a
 832                                 // delay) once they've send us a commitment_signed!
 833
 834                                 PendingHTLCStatus::Forward(PendingForwardHTLCInfo {
 835                                         onion_packet: None,
 836                                         payment_hash: msg.payment_hash.clone(),
 837                                         short_channel_id: 0,
 838                                         incoming_shared_secret: shared_secret.clone(),
 839                                         amt_to_forward: next_hop_data.data.amt_to_forward,
 840                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
 841                                 })
 842                         } else {
 843                                 let mut new_packet_data = [0; 20*65];
 844                                 chacha.process(&msg.onion_routing_packet.hop_data[65..], &mut new_packet_data[0..19*65]);
 845                                 chacha.process(&ChannelManager::ZERO[0..65], &mut new_packet_data[19*65..]);
 846
 847                                 let mut new_pubkey = msg.onion_routing_packet.public_key.unwrap();
 848
 849                                 let blinding_factor = {
 850                                         let mut sha = Sha256::new();
 851                                         sha.input(&new_pubkey.serialize()[..]);
 852                                         sha.input(&shared_secret[..]);
 853                                         let mut res = [0u8; 32];
 854                                         sha.result(&mut res);
 855                                         match SecretKey::from_slice(&self.secp_ctx, &res) {
 856                                                 Err(_) => {
 857                                                         return_err!("Blinding factor is an invalid private key", 0x8000 | 0x4000 | 6, &get_onion_hash!());
 858                                                 },
 859                                                 Ok(key) => key
 860                                         }
 861                                 };
 862
 863                                 if let Err(_) = new_pubkey.mul_assign(&self.secp_ctx, &blinding_factor) {
 864                                         return_err!("New blinding factor is an invalid private key", 0x8000 | 0x4000 | 6, &get_onion_hash!());
 865                                 }
 866
 867                                 let outgoing_packet = msgs::OnionPacket {
 868                                         version: 0,
 869                                         public_key: Ok(new_pubkey),
 870                                         hop_data: new_packet_data,
 871                                         hmac: next_hop_data.hmac.clone(),
 872                                 };
 873
 874                                 PendingHTLCStatus::Forward(PendingForwardHTLCInfo {
 875                                         onion_packet: Some(outgoing_packet),
 876                                         payment_hash: msg.payment_hash.clone(),
 877                                         short_channel_id: next_hop_data.data.short_channel_id,
 878                                         incoming_shared_secret: shared_secret.clone(),
 879                                         amt_to_forward: next_hop_data.data.amt_to_forward,
 880                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
 881                                 })
 882                         };
 883
 884                 channel_state = Some(self.channel_state.lock().unwrap());
 885                 if let &PendingHTLCStatus::Forward(PendingForwardHTLCInfo { ref onion_packet, ref short_channel_id, ref amt_to_forward, ref outgoing_cltv_value, .. }) = &pending_forward_info {
 886                         if onion_packet.is_some() { // If short_channel_id is 0 here, we'll reject them in the body here
 887                                 let id_option = channel_state.as_ref().unwrap().short_to_id.get(&short_channel_id).cloned();
 888                                 let forwarding_id = match id_option {
 889                                         None => {
 890                                                 return_err!("Don't have available channel for forwarding as requested.", 0x4000 | 10, &[0;0]);
 891                                         },
 892                                         Some(id) => id.clone(),
 893                                 };
 894                                 if let Some((err, code, chan_update)) = {
 895                                         let chan = channel_state.as_mut().unwrap().by_id.get_mut(&forwarding_id).unwrap();
 896                                         if !chan.is_live() {
 897                                                 Some(("Forwarding channel is not in a ready state.", 0x1000 | 7, self.get_channel_update(chan).unwrap()))
 898                                         } else {
 899                                                 let fee = amt_to_forward.checked_mul(self.fee_proportional_millionths as u64).and_then(|prop_fee| { (prop_fee / 1000000).checked_add(chan.get_our_fee_base_msat(&*self.fee_estimator) as u64) });
 900                                                 if fee.is_none() || msg.amount_msat < fee.unwrap() || (msg.amount_msat - fee.unwrap()) < *amt_to_forward {
 901                                                         Some(("Prior hop has deviated from specified fees parameters or origin node has obsolete ones", 0x1000 | 12, self.get_channel_update(chan).unwrap()))
 902                                                 } else {
 903                                                         if (msg.cltv_expiry as u64) < (*outgoing_cltv_value) as u64 + CLTV_EXPIRY_DELTA as u64 {
 904                                                                 Some(("Forwarding node has tampered with the intended HTLC values or origin node has an obsolete cltv_expiry_delta", 0x1000 | 13, self.get_channel_update(chan).unwrap()))
 905                                                         } else {
 906                                                                 None
 907                                                         }
 908                                                 }
 909                                         }
 910                                 } {
 911                                         return_err!(err, code, &chan_update.encode_with_len()[..]);
 912                                 }
 913                         }
 914                 }
 915
 916                 (pending_forward_info, channel_state.unwrap())
 917         }
 918
 919         /// only fails if the channel does not yet have an assigned short_id
 920         fn get_channel_update(&self, chan: &Channel) -> Result<msgs::ChannelUpdate, HandleError> {
 921                 let short_channel_id = match chan.get_short_channel_id() {
 922                         None => return Err(HandleError{err: "Channel not yet established", action: None}),
 923                         Some(id) => id,
 924                 };
 925
 926                 let were_node_one = PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).serialize()[..] < chan.get_their_node_id().serialize()[..];
 927
 928                 let unsigned = msgs::UnsignedChannelUpdate {
 929                         chain_hash: self.genesis_hash,
 930                         short_channel_id: short_channel_id,
 931                         timestamp: chan.get_channel_update_count(),
 932                         flags: (!were_node_one) as u16 | ((!chan.is_live() as u16) << 1),
 933                         cltv_expiry_delta: CLTV_EXPIRY_DELTA,
 934                         htlc_minimum_msat: chan.get_our_htlc_minimum_msat(),
 935                         fee_base_msat: chan.get_our_fee_base_msat(&*self.fee_estimator),
 936                         fee_proportional_millionths: self.fee_proportional_millionths,
 937                         excess_data: Vec::new(),
 938                 };
 939
 940                 let msg_hash = Sha256dHash::from_data(&unsigned.encode()[..]);
 941                 let sig = self.secp_ctx.sign(&Message::from_slice(&msg_hash[..]).unwrap(), &self.our_network_key); //TODO Can we unwrap here?
 942
 943                 Ok(msgs::ChannelUpdate {
 944                         signature: sig,
 945                         contents: unsigned
 946                 })
 947         }
 948
 949         /// Sends a payment along a given route.
 950         /// Value parameters are provided via the last hop in route, see documentation for RouteHop
 951         /// fields for more info.
 952         /// Note that if the payment_hash already exists elsewhere (eg you're sending a duplicative
 953         /// payment), we don't do anything to stop you! We always try to ensure that if the provided
 954         /// next hop knows the preimage to payment_hash they can claim an additional amount as
 955         /// specified in the last hop in the route! Thus, you should probably do your own
 956         /// payment_preimage tracking (which you should already be doing as they represent "proof of
 957         /// payment") and prevent double-sends yourself.
 958         /// See-also docs on Channel::send_htlc_and_commit.
 959         /// May generate a SendHTLCs event on success, which should be relayed.
 960         /// Raises APIError::RoutError when invalid route or forward parameter
 961         /// (cltv_delta, fee, node public key) is specified
 962         pub fn send_payment(&self, route: Route, payment_hash: [u8; 32]) -> Result<(), APIError> {
 963                 if route.hops.len() < 1 || route.hops.len() > 20 {
 964                         return Err(APIError::RouteError{err: "Route didn't go anywhere/had bogus size"});
 965                 }
 966                 let our_node_id = self.get_our_node_id();
 967                 for (idx, hop) in route.hops.iter().enumerate() {
 968                         if idx != route.hops.len() - 1 && hop.pubkey == our_node_id {
 969                                 return Err(APIError::RouteError{err: "Route went through us but wasn't a simple rebalance loop to us"});
 970                         }
 971                 }
 972
 973                 let session_priv = SecretKey::from_slice(&self.secp_ctx, &{
 974                         let mut session_key = [0; 32];
 975                         rng::fill_bytes(&mut session_key);
 976                         session_key
 977                 }).expect("RNG is bad!");
 978
 979                 let cur_height = self.latest_block_height.load(Ordering::Acquire) as u32 + 1;
 980
 981                 let onion_keys = secp_call!(ChannelManager::construct_onion_keys(&self.secp_ctx, &route, &session_priv),
 982                                 APIError::RouteError{err: "Pubkey along hop was maliciously selected"});
 983                 let (onion_payloads, htlc_msat, htlc_cltv) = ChannelManager::build_onion_payloads(&route, cur_height)?;
 984                 let onion_packet = ChannelManager::construct_onion_packet(onion_payloads, onion_keys, &payment_hash);
 985
 986                 let (first_hop_node_id, (update_add, commitment_signed, chan_monitor)) = {
 987                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 988                         let channel_state = channel_state_lock.borrow_parts();
 989
 990                         let id = match channel_state.short_to_id.get(&route.hops.first().unwrap().short_channel_id) {
 991                                 None => return Err(APIError::RouteError{err: "No channel available with first hop!"}),
 992                                 Some(id) => id.clone(),
 993                         };
 994
 995                         let res = {
 996                                 let chan = channel_state.by_id.get_mut(&id).unwrap();
 997                                 if chan.get_their_node_id() != route.hops.first().unwrap().pubkey {
 998                                         return Err(APIError::RouteError{err: "Node ID mismatch on first hop!"});
 999                                 }
1000                                 if !chan.is_live() {
1001                                         return Err(APIError::RouteError{err: "Peer for first hop currently disconnected!"});
1002                                 }
1003                                 chan.send_htlc_and_commit(htlc_msat, payment_hash.clone(), htlc_cltv, HTLCSource::OutboundRoute {
1004                                         route: route.clone(),
1005                                         session_priv: session_priv.clone(),
1006                                 }, onion_packet).map_err(|he| APIError::RouteError{err: he.err})?
1007                         };
1008
1009                         let first_hop_node_id = route.hops.first().unwrap().pubkey;
1010
1011                         match res {
1012                                 Some(msgs) => (first_hop_node_id, msgs),
1013                                 None => return Ok(()),
1014                         }
1015                 };
1016
1017                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1018                         unimplemented!();
1019                 }
1020
1021                 let mut events = self.pending_events.lock().unwrap();
1022                 events.push(events::Event::UpdateHTLCs {
1023                         node_id: first_hop_node_id,
1024                         updates: msgs::CommitmentUpdate {
1025                                 update_add_htlcs: vec![update_add],
1026                                 update_fulfill_htlcs: Vec::new(),
1027                                 update_fail_htlcs: Vec::new(),
1028                                 update_fail_malformed_htlcs: Vec::new(),
1029                                 commitment_signed,
1030                         },
1031                 });
1032                 Ok(())
1033         }
1034
1035         /// Call this upon creation of a funding transaction for the given channel.
1036         /// Panics if a funding transaction has already been provided for this channel.
1037         /// May panic if the funding_txo is duplicative with some other channel (note that this should
1038         /// be trivially prevented by using unique funding transaction keys per-channel).
1039         pub fn funding_transaction_generated(&self, temporary_channel_id: &[u8; 32], funding_txo: OutPoint) {
1040
1041                 macro_rules! add_pending_event {
1042                         ($event: expr) => {
1043                                 {
1044                                         let mut pending_events = self.pending_events.lock().unwrap();
1045                                         pending_events.push($event);
1046                                 }
1047                         }
1048                 }
1049
1050                 let (chan, msg, chan_monitor) = {
1051                         let mut channel_state = self.channel_state.lock().unwrap();
1052                         match channel_state.by_id.remove(temporary_channel_id) {
1053                                 Some(mut chan) => {
1054                                         match chan.get_outbound_funding_created(funding_txo) {
1055                                                 Ok(funding_msg) => {
1056                                                         (chan, funding_msg.0, funding_msg.1)
1057                                                 },
1058                                                 Err(e) => {
1059                                                         log_error!(self, "Got bad signatures: {}!", e.err);
1060                                                         mem::drop(channel_state);
1061                                                         add_pending_event!(events::Event::HandleError {
1062                                                                 node_id: chan.get_their_node_id(),
1063                                                                 action: e.action,
1064                                                         });
1065                                                         return;
1066                                                 },
1067                                         }
1068                                 },
1069                                 None => return
1070                         }
1071                 }; // Release channel lock for install_watch_outpoint call,
1072                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1073                         unimplemented!();
1074                 }
1075                 add_pending_event!(events::Event::SendFundingCreated {
1076                         node_id: chan.get_their_node_id(),
1077                         msg: msg,
1078                 });
1079
1080                 let mut channel_state = self.channel_state.lock().unwrap();
1081                 match channel_state.by_id.entry(chan.channel_id()) {
1082                         hash_map::Entry::Occupied(_) => {
1083                                 panic!("Generated duplicate funding txid?");
1084                         },
1085                         hash_map::Entry::Vacant(e) => {
1086                                 e.insert(chan);
1087                         }
1088                 }
1089         }
1090
1091         fn get_announcement_sigs(&self, chan: &Channel) -> Option<msgs::AnnouncementSignatures> {
1092                 if !chan.should_announce() { return None }
1093
1094                 let (announcement, our_bitcoin_sig) = match chan.get_channel_announcement(self.get_our_node_id(), self.genesis_hash.clone()) {
1095                         Ok(res) => res,
1096                         Err(_) => return None, // Only in case of state precondition violations eg channel is closing
1097                 };
1098                 let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
1099                 let our_node_sig = self.secp_ctx.sign(&msghash, &self.our_network_key);
1100
1101                 Some(msgs::AnnouncementSignatures {
1102                         channel_id: chan.channel_id(),
1103                         short_channel_id: chan.get_short_channel_id().unwrap(),
1104                         node_signature: our_node_sig,
1105                         bitcoin_signature: our_bitcoin_sig,
1106                 })
1107         }
1108
1109         /// Processes HTLCs which are pending waiting on random forward delay.
1110         /// Should only really ever be called in response to an PendingHTLCsForwardable event.
1111         /// Will likely generate further events.
1112         pub fn process_pending_htlc_forwards(&self) {
1113                 let mut new_events = Vec::new();
1114                 let mut failed_forwards = Vec::new();
1115                 {
1116                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1117                         let channel_state = channel_state_lock.borrow_parts();
1118
1119                         if cfg!(not(feature = "fuzztarget")) && Instant::now() < *channel_state.next_forward {
1120                                 return;
1121                         }
1122
1123                         for (short_chan_id, mut pending_forwards) in channel_state.forward_htlcs.drain() {
1124                                 if short_chan_id != 0 {
1125                                         let forward_chan_id = match channel_state.short_to_id.get(&short_chan_id) {
1126                                                 Some(chan_id) => chan_id.clone(),
1127                                                 None => {
1128                                                         failed_forwards.reserve(pending_forwards.len());
1129                                                         for HTLCForwardInfo { prev_short_channel_id, prev_htlc_id, forward_info } in pending_forwards.drain(..) {
1130                                                                 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
1131                                                                         short_channel_id: prev_short_channel_id,
1132                                                                         htlc_id: prev_htlc_id,
1133                                                                         incoming_packet_shared_secret: forward_info.incoming_shared_secret,
1134                                                                 });
1135                                                                 failed_forwards.push((htlc_source, forward_info.payment_hash, 0x4000 | 10, None));
1136                                                         }
1137                                                         continue;
1138                                                 }
1139                                         };
1140                                         let forward_chan = &mut channel_state.by_id.get_mut(&forward_chan_id).unwrap();
1141
1142                                         let mut add_htlc_msgs = Vec::new();
1143                                         for HTLCForwardInfo { prev_short_channel_id, prev_htlc_id, forward_info } in pending_forwards.drain(..) {
1144                                                 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
1145                                                         short_channel_id: prev_short_channel_id,
1146                                                         htlc_id: prev_htlc_id,
1147                                                         incoming_packet_shared_secret: forward_info.incoming_shared_secret,
1148                                                 });
1149                                                 match forward_chan.send_htlc(forward_info.amt_to_forward, forward_info.payment_hash, forward_info.outgoing_cltv_value, htlc_source.clone(), forward_info.onion_packet.unwrap()) {
1150                                                         Err(_e) => {
1151                                                                 let chan_update = self.get_channel_update(forward_chan).unwrap();
1152                                                                 failed_forwards.push((htlc_source, forward_info.payment_hash, 0x1000 | 7, Some(chan_update)));
1153                                                                 continue;
1154                                                         },
1155                                                         Ok(update_add) => {
1156                                                                 match update_add {
1157                                                                         Some(msg) => { add_htlc_msgs.push(msg); },
1158                                                                         None => {
1159                                                                                 // Nothing to do here...we're waiting on a remote
1160                                                                                 // revoke_and_ack before we can add anymore HTLCs. The Channel
1161                                                                                 // will automatically handle building the update_add_htlc and
1162                                                                                 // commitment_signed messages when we can.
1163                                                                                 // TODO: Do some kind of timer to set the channel as !is_live()
1164                                                                                 // as we don't really want others relying on us relaying through
1165                                                                                 // this channel currently :/.
1166                                                                         }
1167                                                                 }
1168                                                         }
1169                                                 }
1170                                         }
1171
1172                                         if !add_htlc_msgs.is_empty() {
1173                                                 let (commitment_msg, monitor) = match forward_chan.send_commitment() {
1174                                                         Ok(res) => res,
1175                                                         Err(e) => {
1176                                                                 if let &Some(msgs::ErrorAction::DisconnectPeer{msg: Some(ref _err_msg)}) = &e.action {
1177                                                                 } else if let &Some(msgs::ErrorAction::SendErrorMessage{msg: ref _err_msg}) = &e.action {
1178                                                                 } else {
1179                                                                         panic!("Stated return value requirements in send_commitment() were not met");
1180                                                                 }
1181                                                                 //TODO: Handle...this is bad!
1182                                                                 continue;
1183                                                         },
1184                                                 };
1185                                                 new_events.push((Some(monitor), events::Event::UpdateHTLCs {
1186                                                         node_id: forward_chan.get_their_node_id(),
1187                                                         updates: msgs::CommitmentUpdate {
1188                                                                 update_add_htlcs: add_htlc_msgs,
1189                                                                 update_fulfill_htlcs: Vec::new(),
1190                                                                 update_fail_htlcs: Vec::new(),
1191                                                                 update_fail_malformed_htlcs: Vec::new(),
1192                                                                 commitment_signed: commitment_msg,
1193                                                         },
1194                                                 }));
1195                                         }
1196                                 } else {
1197                                         for HTLCForwardInfo { prev_short_channel_id, prev_htlc_id, forward_info } in pending_forwards.drain(..) {
1198                                                 let prev_hop_data = HTLCPreviousHopData {
1199                                                         short_channel_id: prev_short_channel_id,
1200                                                         htlc_id: prev_htlc_id,
1201                                                         incoming_packet_shared_secret: forward_info.incoming_shared_secret,
1202                                                 };
1203                                                 match channel_state.claimable_htlcs.entry(forward_info.payment_hash) {
1204                                                         hash_map::Entry::Occupied(mut entry) => entry.get_mut().push(prev_hop_data),
1205                                                         hash_map::Entry::Vacant(entry) => { entry.insert(vec![prev_hop_data]); },
1206                                                 };
1207                                                 new_events.push((None, events::Event::PaymentReceived {
1208                                                         payment_hash: forward_info.payment_hash,
1209                                                         amt: forward_info.amt_to_forward,
1210                                                 }));
1211                                         }
1212                                 }
1213                         }
1214                 }
1215
1216                 for (htlc_source, payment_hash, failure_code, update) in failed_forwards.drain(..) {
1217                         match update {
1218                                 None => self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source, &payment_hash, HTLCFailReason::Reason { failure_code, data: Vec::new() }),
1219                                 Some(chan_update) => self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source, &payment_hash, HTLCFailReason::Reason { failure_code, data: chan_update.encode_with_len() }),
1220                         };
1221                 }
1222
1223                 if new_events.is_empty() { return }
1224
1225                 new_events.retain(|event| {
1226                         if let &Some(ref monitor) = &event.0 {
1227                                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor.clone()) {
1228                                         unimplemented!();// but def dont push the event...
1229                                 }
1230                         }
1231                         true
1232                 });
1233
1234                 let mut events = self.pending_events.lock().unwrap();
1235                 events.reserve(new_events.len());
1236                 for event in new_events.drain(..) {
1237                         events.push(event.1);
1238                 }
1239         }
1240
1241         /// Indicates that the preimage for payment_hash is unknown after a PaymentReceived event.
1242         pub fn fail_htlc_backwards(&self, payment_hash: &[u8; 32]) -> bool {
1243                 let mut channel_state = Some(self.channel_state.lock().unwrap());
1244                 let removed_source = channel_state.as_mut().unwrap().claimable_htlcs.remove(payment_hash);
1245                 if let Some(mut sources) = removed_source {
1246                         for htlc_with_hash in sources.drain(..) {
1247                                 if channel_state.is_none() { channel_state = Some(self.channel_state.lock().unwrap()); }
1248                                 self.fail_htlc_backwards_internal(channel_state.take().unwrap(), HTLCSource::PreviousHopData(htlc_with_hash), payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 15, data: Vec::new() });
1249                         }
1250                         true
1251                 } else { false }
1252         }
1253
1254         /// Fails an HTLC backwards to the sender of it to us.
1255         /// Note that while we take a channel_state lock as input, we do *not* assume consistency here.
1256         /// There are several callsites that do stupid things like loop over a list of payment_hashes
1257         /// to fail and take the channel_state lock for each iteration (as we take ownership and may
1258         /// drop it). In other words, no assumptions are made that entries in claimable_htlcs point to
1259         /// still-available channels.
1260         fn fail_htlc_backwards_internal(&self, mut channel_state: MutexGuard<ChannelHolder>, source: HTLCSource, payment_hash: &[u8; 32], onion_error: HTLCFailReason) {
1261                 match source {
1262                         HTLCSource::OutboundRoute { .. } => {
1263                                 mem::drop(channel_state);
1264
1265                                 let mut pending_events = self.pending_events.lock().unwrap();
1266                                 pending_events.push(events::Event::PaymentFailed {
1267                                         payment_hash: payment_hash.clone()
1268                                 });
1269                         },
1270                         HTLCSource::PreviousHopData(HTLCPreviousHopData { short_channel_id, htlc_id, incoming_packet_shared_secret }) => {
1271                                 let err_packet = match onion_error {
1272                                         HTLCFailReason::Reason { failure_code, data } => {
1273                                                 let packet = ChannelManager::build_failure_packet(&incoming_packet_shared_secret, failure_code, &data[..]).encode();
1274                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &packet)
1275                                         },
1276                                         HTLCFailReason::ErrorPacket { err } => {
1277                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &err.data)
1278                                         }
1279                                 };
1280
1281                                 let (node_id, fail_msgs) = {
1282                                         let chan_id = match channel_state.short_to_id.get(&short_channel_id) {
1283                                                 Some(chan_id) => chan_id.clone(),
1284                                                 None => return
1285                                         };
1286
1287                                         let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
1288                                         match chan.get_update_fail_htlc_and_commit(htlc_id, err_packet) {
1289                                                 Ok(msg) => (chan.get_their_node_id(), msg),
1290                                                 Err(_e) => {
1291                                                         //TODO: Do something with e?
1292                                                         return;
1293                                                 },
1294                                         }
1295                                 };
1296
1297                                 match fail_msgs {
1298                                         Some((msg, commitment_msg, chan_monitor)) => {
1299                                                 mem::drop(channel_state);
1300
1301                                                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1302                                                         unimplemented!();// but def dont push the event...
1303                                                 }
1304
1305                                                 let mut pending_events = self.pending_events.lock().unwrap();
1306                                                 pending_events.push(events::Event::UpdateHTLCs {
1307                                                         node_id,
1308                                                         updates: msgs::CommitmentUpdate {
1309                                                                 update_add_htlcs: Vec::new(),
1310                                                                 update_fulfill_htlcs: Vec::new(),
1311                                                                 update_fail_htlcs: vec![msg],
1312                                                                 update_fail_malformed_htlcs: Vec::new(),
1313                                                                 commitment_signed: commitment_msg,
1314                                                         },
1315                                                 });
1316                                         },
1317                                         None => {},
1318                                 }
1319                         },
1320                 }
1321         }
1322
1323         /// Provides a payment preimage in response to a PaymentReceived event, returning true and
1324         /// generating message events for the net layer to claim the payment, if possible. Thus, you
1325         /// should probably kick the net layer to go send messages if this returns true!
1326         /// May panic if called except in response to a PaymentReceived event.
1327         pub fn claim_funds(&self, payment_preimage: [u8; 32]) -> bool {
1328                 let mut sha = Sha256::new();
1329                 sha.input(&payment_preimage);
1330                 let mut payment_hash = [0; 32];
1331                 sha.result(&mut payment_hash);
1332
1333                 let mut channel_state = Some(self.channel_state.lock().unwrap());
1334                 let removed_source = channel_state.as_mut().unwrap().claimable_htlcs.remove(&payment_hash);
1335                 if let Some(mut sources) = removed_source {
1336                         for htlc_with_hash in sources.drain(..) {
1337                                 if channel_state.is_none() { channel_state = Some(self.channel_state.lock().unwrap()); }
1338                                 self.claim_funds_internal(channel_state.take().unwrap(), HTLCSource::PreviousHopData(htlc_with_hash), payment_preimage);
1339                         }
1340                         true
1341                 } else { false }
1342         }
1343         fn claim_funds_internal(&self, mut channel_state: MutexGuard<ChannelHolder>, source: HTLCSource, payment_preimage: [u8; 32]) {
1344                 match source {
1345                         HTLCSource::OutboundRoute { .. } => {
1346                                 mem::drop(channel_state);
1347                                 let mut pending_events = self.pending_events.lock().unwrap();
1348                                 pending_events.push(events::Event::PaymentSent {
1349                                         payment_preimage
1350                                 });
1351                         },
1352                         HTLCSource::PreviousHopData(HTLCPreviousHopData { short_channel_id, htlc_id, .. }) => {
1353                                 //TODO: Delay the claimed_funds relaying just like we do outbound relay!
1354                                 let (node_id, fulfill_msgs) = {
1355                                         let chan_id = match channel_state.short_to_id.get(&short_channel_id) {
1356                                                 Some(chan_id) => chan_id.clone(),
1357                                                 None => {
1358                                                         // TODO: There is probably a channel manager somewhere that needs to
1359                                                         // learn the preimage as the channel already hit the chain and that's
1360                                                         // why its missing.
1361                                                         return
1362                                                 }
1363                                         };
1364
1365                                         let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
1366                                         match chan.get_update_fulfill_htlc_and_commit(htlc_id, payment_preimage) {
1367                                                 Ok(msg) => (chan.get_their_node_id(), msg),
1368                                                 Err(_e) => {
1369                                                         // TODO: There is probably a channel manager somewhere that needs to
1370                                                         // learn the preimage as the channel may be about to hit the chain.
1371                                                         //TODO: Do something with e?
1372                                                         return
1373                                                 },
1374                                         }
1375                                 };
1376
1377                                 mem::drop(channel_state);
1378                                 if let Some(chan_monitor) = fulfill_msgs.1 {
1379                                         if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1380                                                 unimplemented!();// but def dont push the event...
1381                                         }
1382                                 }
1383
1384                                 if let Some((msg, commitment_msg)) = fulfill_msgs.0 {
1385                                         let mut pending_events = self.pending_events.lock().unwrap();
1386                                         pending_events.push(events::Event::UpdateHTLCs {
1387                                                 node_id: node_id,
1388                                                 updates: msgs::CommitmentUpdate {
1389                                                         update_add_htlcs: Vec::new(),
1390                                                         update_fulfill_htlcs: vec![msg],
1391                                                         update_fail_htlcs: Vec::new(),
1392                                                         update_fail_malformed_htlcs: Vec::new(),
1393                                                         commitment_signed: commitment_msg,
1394                                                 }
1395                                         });
1396                                 }
1397                         },
1398                 }
1399         }
1400
1401         /// Gets the node_id held by this ChannelManager
1402         pub fn get_our_node_id(&self) -> PublicKey {
1403                 PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key)
1404         }
1405
1406         /// Used to restore channels to normal operation after a
1407         /// ChannelMonitorUpdateErr::TemporaryFailure was returned from a channel monitor update
1408         /// operation.
1409         pub fn test_restore_channel_monitor(&self) {
1410                 unimplemented!();
1411         }
1412
1413         fn internal_open_channel(&self, their_node_id: &PublicKey, msg: &msgs::OpenChannel) -> Result<msgs::AcceptChannel, MsgHandleErrInternal> {
1414                 if msg.chain_hash != self.genesis_hash {
1415                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Unknown genesis block hash", msg.temporary_channel_id.clone()));
1416                 }
1417                 let mut channel_state = self.channel_state.lock().unwrap();
1418                 if channel_state.by_id.contains_key(&msg.temporary_channel_id) {
1419                         return Err(MsgHandleErrInternal::send_err_msg_no_close("temporary_channel_id collision!", msg.temporary_channel_id.clone()));
1420                 }
1421
1422                 let chan_keys = if cfg!(feature = "fuzztarget") {
1423                         ChannelKeys {
1424                                 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, 1, 0]).unwrap(),
1425                                 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, 2, 0]).unwrap(),
1426                                 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, 3, 0]).unwrap(),
1427                                 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, 4, 0]).unwrap(),
1428                                 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, 5, 0]).unwrap(),
1429                                 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, 6, 0]).unwrap(),
1430                                 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, 7, 0]).unwrap(),
1431                                 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],
1432                         }
1433                 } else {
1434                         let mut key_seed = [0u8; 32];
1435                         rng::fill_bytes(&mut key_seed);
1436                         match ChannelKeys::new_from_seed(&key_seed) {
1437                                 Ok(key) => key,
1438                                 Err(_) => panic!("RNG is busted!")
1439                         }
1440                 };
1441
1442                 let channel = Channel::new_from_req(&*self.fee_estimator, chan_keys, their_node_id.clone(), msg, 0, false, self.announce_channels_publicly, Arc::clone(&self.logger)).map_err(|e| MsgHandleErrInternal::from_no_close(e))?;
1443                 let accept_msg = channel.get_accept_channel();
1444                 channel_state.by_id.insert(channel.channel_id(), channel);
1445                 Ok(accept_msg)
1446         }
1447
1448         fn internal_accept_channel(&self, their_node_id: &PublicKey, msg: &msgs::AcceptChannel) -> Result<(), MsgHandleErrInternal> {
1449                 let (value, output_script, user_id) = {
1450                         let mut channel_state = self.channel_state.lock().unwrap();
1451                         match channel_state.by_id.get_mut(&msg.temporary_channel_id) {
1452                                 Some(chan) => {
1453                                         if chan.get_their_node_id() != *their_node_id {
1454                                                 //TODO: see issue #153, need a consistent behavior on obnoxious behavior from random node
1455                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.temporary_channel_id));
1456                                         }
1457                                         chan.accept_channel(&msg).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))?;
1458                                         (chan.get_value_satoshis(), chan.get_funding_redeemscript().to_v0_p2wsh(), chan.get_user_id())
1459                                 },
1460                                 //TODO: same as above
1461                                 None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.temporary_channel_id))
1462                         }
1463                 };
1464                 let mut pending_events = self.pending_events.lock().unwrap();
1465                 pending_events.push(events::Event::FundingGenerationReady {
1466                         temporary_channel_id: msg.temporary_channel_id,
1467                         channel_value_satoshis: value,
1468                         output_script: output_script,
1469                         user_channel_id: user_id,
1470                 });
1471                 Ok(())
1472         }
1473
1474         fn internal_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) -> Result<msgs::FundingSigned, MsgHandleErrInternal> {
1475                 let (chan, funding_msg, monitor_update) = {
1476                         let mut channel_state = self.channel_state.lock().unwrap();
1477                         match channel_state.by_id.entry(msg.temporary_channel_id.clone()) {
1478                                 hash_map::Entry::Occupied(mut chan) => {
1479                                         if chan.get().get_their_node_id() != *their_node_id {
1480                                                 //TODO: here and below MsgHandleErrInternal, #153 case
1481                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.temporary_channel_id));
1482                                         }
1483                                         match chan.get_mut().funding_created(msg) {
1484                                                 Ok((funding_msg, monitor_update)) => {
1485                                                         (chan.remove(), funding_msg, monitor_update)
1486                                                 },
1487                                                 Err(e) => {
1488                                                         return Err(e).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))
1489                                                 }
1490                                         }
1491                                 },
1492                                 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.temporary_channel_id))
1493                         }
1494                 }; // Release channel lock for install_watch_outpoint call,
1495                    // note that this means if the remote end is misbehaving and sends a message for the same
1496                    // channel back-to-back with funding_created, we'll end up thinking they sent a message
1497                    // for a bogus channel.
1498                 if let Err(_e) = self.monitor.add_update_monitor(monitor_update.get_funding_txo().unwrap(), monitor_update) {
1499                         unimplemented!();
1500                 }
1501                 let mut channel_state = self.channel_state.lock().unwrap();
1502                 match channel_state.by_id.entry(funding_msg.channel_id) {
1503                         hash_map::Entry::Occupied(_) => {
1504                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Already had channel with the new channel_id", funding_msg.channel_id))
1505                         },
1506                         hash_map::Entry::Vacant(e) => {
1507                                 e.insert(chan);
1508                         }
1509                 }
1510                 Ok(funding_msg)
1511         }
1512
1513         fn internal_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) -> Result<(), MsgHandleErrInternal> {
1514                 let (funding_txo, user_id, monitor) = {
1515                         let mut channel_state = self.channel_state.lock().unwrap();
1516                         match channel_state.by_id.get_mut(&msg.channel_id) {
1517                                 Some(chan) => {
1518                                         if chan.get_their_node_id() != *their_node_id {
1519                                                 //TODO: here and below MsgHandleErrInternal, #153 case
1520                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1521                                         }
1522                                         let chan_monitor = chan.funding_signed(&msg).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))?;
1523                                         (chan.get_funding_txo().unwrap(), chan.get_user_id(), chan_monitor)
1524                                 },
1525                                 None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1526                         }
1527                 };
1528                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor) {
1529                         unimplemented!();
1530                 }
1531                 let mut pending_events = self.pending_events.lock().unwrap();
1532                 pending_events.push(events::Event::FundingBroadcastSafe {
1533                         funding_txo: funding_txo,
1534                         user_channel_id: user_id,
1535                 });
1536                 Ok(())
1537         }
1538
1539         fn internal_funding_locked(&self, their_node_id: &PublicKey, msg: &msgs::FundingLocked) -> Result<Option<msgs::AnnouncementSignatures>, MsgHandleErrInternal> {
1540                 let mut channel_state = self.channel_state.lock().unwrap();
1541                 match channel_state.by_id.get_mut(&msg.channel_id) {
1542                         Some(chan) => {
1543                                 if chan.get_their_node_id() != *their_node_id {
1544                                         //TODO: here and below MsgHandleErrInternal, #153 case
1545                                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1546                                 }
1547                                 chan.funding_locked(&msg).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))?;
1548                                 return Ok(self.get_announcement_sigs(chan));
1549                         },
1550                         None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1551                 };
1552         }
1553
1554         fn internal_shutdown(&self, their_node_id: &PublicKey, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>), MsgHandleErrInternal> {
1555                 let (mut res, chan_option) = {
1556                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1557                         let channel_state = channel_state_lock.borrow_parts();
1558
1559                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1560                                 hash_map::Entry::Occupied(mut chan_entry) => {
1561                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1562                                                 //TODO: here and below MsgHandleErrInternal, #153 case
1563                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1564                                         }
1565                                         let res = chan_entry.get_mut().shutdown(&*self.fee_estimator, &msg).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))?;
1566                                         if chan_entry.get().is_shutdown() {
1567                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
1568                                                         channel_state.short_to_id.remove(&short_id);
1569                                                 }
1570                                                 (res, Some(chan_entry.remove_entry().1))
1571                                         } else { (res, None) }
1572                                 },
1573                                 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1574                         }
1575                 };
1576                 for htlc_source in res.2.drain(..) {
1577                         // unknown_next_peer...I dunno who that is anymore....
1578                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source.0, &htlc_source.1, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
1579                 }
1580                 if let Some(chan) = chan_option {
1581                         if let Ok(update) = self.get_channel_update(&chan) {
1582                                 let mut events = self.pending_events.lock().unwrap();
1583                                 events.push(events::Event::BroadcastChannelUpdate {
1584                                         msg: update
1585                                 });
1586                         }
1587                 }
1588                 Ok((res.0, res.1))
1589         }
1590
1591         fn internal_closing_signed(&self, their_node_id: &PublicKey, msg: &msgs::ClosingSigned) -> Result<Option<msgs::ClosingSigned>, MsgHandleErrInternal> {
1592                 let (res, chan_option) = {
1593                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1594                         let channel_state = channel_state_lock.borrow_parts();
1595                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1596                                 hash_map::Entry::Occupied(mut chan_entry) => {
1597                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1598                                                 //TODO: here and below MsgHandleErrInternal, #153 case
1599                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1600                                         }
1601                                         let res = chan_entry.get_mut().closing_signed(&*self.fee_estimator, &msg).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))?;
1602                                         if res.1.is_some() {
1603                                                 // We're done with this channel, we've got a signed closing transaction and
1604                                                 // will send the closing_signed back to the remote peer upon return. This
1605                                                 // also implies there are no pending HTLCs left on the channel, so we can
1606                                                 // fully delete it from tracking (the channel monitor is still around to
1607                                                 // watch for old state broadcasts)!
1608                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
1609                                                         channel_state.short_to_id.remove(&short_id);
1610                                                 }
1611                                                 (res, Some(chan_entry.remove_entry().1))
1612                                         } else { (res, None) }
1613                                 },
1614                                 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1615                         }
1616                 };
1617                 if let Some(broadcast_tx) = res.1 {
1618                         self.tx_broadcaster.broadcast_transaction(&broadcast_tx);
1619                 }
1620                 if let Some(chan) = chan_option {
1621                         if let Ok(update) = self.get_channel_update(&chan) {
1622                                 let mut events = self.pending_events.lock().unwrap();
1623                                 events.push(events::Event::BroadcastChannelUpdate {
1624                                         msg: update
1625                                 });
1626                         }
1627                 }
1628                 Ok(res.0)
1629         }
1630
1631         fn internal_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) -> Result<(), MsgHandleErrInternal> {
1632                 //TODO: BOLT 4 points out a specific attack where a peer may re-send an onion packet and
1633                 //determine the state of the payment based on our response/if we forward anything/the time
1634                 //we take to respond. We should take care to avoid allowing such an attack.
1635                 //
1636                 //TODO: There exists a further attack where a node may garble the onion data, forward it to
1637                 //us repeatedly garbled in different ways, and compare our error messages, which are
1638                 //encrypted with the same key. Its not immediately obvious how to usefully exploit that,
1639                 //but we should prevent it anyway.
1640
1641                 let (pending_forward_info, mut channel_state_lock) = self.decode_update_add_htlc_onion(msg);
1642                 let channel_state = channel_state_lock.borrow_parts();
1643
1644                 match channel_state.by_id.get_mut(&msg.channel_id) {
1645                         Some(chan) => {
1646                                 if chan.get_their_node_id() != *their_node_id {
1647                                         //TODO: here MsgHandleErrInternal, #153 case
1648                                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1649                                 }
1650                                 if !chan.is_usable() {
1651                                         return Err(MsgHandleErrInternal::from_no_close(HandleError{err: "Channel not yet available for receiving HTLCs", action: Some(msgs::ErrorAction::IgnoreError)}));
1652                                 }
1653                                 chan.update_add_htlc(&msg, pending_forward_info).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))
1654                         },
1655                         None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1656                 }
1657         }
1658
1659         fn internal_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) -> Result<(), MsgHandleErrInternal> {
1660                 let mut channel_state = self.channel_state.lock().unwrap();
1661                 let htlc_source = match channel_state.by_id.get_mut(&msg.channel_id) {
1662                         Some(chan) => {
1663                                 if chan.get_their_node_id() != *their_node_id {
1664                                         //TODO: here and below MsgHandleErrInternal, #153 case
1665                                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1666                                 }
1667                                 chan.update_fulfill_htlc(&msg).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))?.clone()
1668                         },
1669                         None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1670                 };
1671                 self.claim_funds_internal(channel_state, htlc_source, msg.payment_preimage.clone());
1672                 Ok(())
1673         }
1674
1675         fn internal_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) -> Result<Option<msgs::HTLCFailChannelUpdate>, MsgHandleErrInternal> {
1676                 let mut channel_state = self.channel_state.lock().unwrap();
1677                 let htlc_source = match channel_state.by_id.get_mut(&msg.channel_id) {
1678                         Some(chan) => {
1679                                 if chan.get_their_node_id() != *their_node_id {
1680                                         //TODO: here and below MsgHandleErrInternal, #153 case
1681                                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1682                                 }
1683                                 chan.update_fail_htlc(&msg, HTLCFailReason::ErrorPacket { err: msg.reason.clone() }).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))
1684                         },
1685                         None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1686                 }?;
1687
1688                 match htlc_source {
1689                         &HTLCSource::OutboundRoute { ref route, ref session_priv, .. } => {
1690                                 // Handle packed channel/node updates for passing back for the route handler
1691                                 let mut packet_decrypted = msg.reason.data.clone();
1692                                 let mut res = None;
1693                                 Self::construct_onion_keys_callback(&self.secp_ctx, &route, &session_priv, |shared_secret, _, _, route_hop| {
1694                                         if res.is_some() { return; }
1695
1696                                         let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
1697
1698                                         let mut decryption_tmp = Vec::with_capacity(packet_decrypted.len());
1699                                         decryption_tmp.resize(packet_decrypted.len(), 0);
1700                                         let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
1701                                         chacha.process(&packet_decrypted, &mut decryption_tmp[..]);
1702                                         packet_decrypted = decryption_tmp;
1703
1704                                         if let Ok(err_packet) = msgs::DecodedOnionErrorPacket::read(&mut Cursor::new(&packet_decrypted)) {
1705                                                 if err_packet.failuremsg.len() >= 2 {
1706                                                         let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
1707
1708                                                         let mut hmac = Hmac::new(Sha256::new(), &um);
1709                                                         hmac.input(&err_packet.encode()[32..]);
1710                                                         let mut calc_tag = [0u8; 32];
1711                                                         hmac.raw_result(&mut calc_tag);
1712                                                         if crypto::util::fixed_time_eq(&calc_tag, &err_packet.hmac) {
1713                                                                 const UNKNOWN_CHAN: u16 = 0x4000|10;
1714                                                                 const TEMP_CHAN_FAILURE: u16 = 0x4000|7;
1715                                                                 match byte_utils::slice_to_be16(&err_packet.failuremsg[0..2]) {
1716                                                                         TEMP_CHAN_FAILURE => {
1717                                                                                 if err_packet.failuremsg.len() >= 4 {
1718                                                                                         let update_len = byte_utils::slice_to_be16(&err_packet.failuremsg[2..4]) as usize;
1719                                                                                         if err_packet.failuremsg.len() >= 4 + update_len {
1720                                                                                                 if let Ok(chan_update) = msgs::ChannelUpdate::read(&mut Cursor::new(&err_packet.failuremsg[4..4 + update_len])) {
1721                                                                                                         res = Some(msgs::HTLCFailChannelUpdate::ChannelUpdateMessage {
1722                                                                                                                 msg: chan_update,
1723                                                                                                         });
1724                                                                                                 }
1725                                                                                         }
1726                                                                                 }
1727                                                                         },
1728                                                                         UNKNOWN_CHAN => {
1729                                                                                 // No such next-hop. We know this came from the
1730                                                                                 // current node as the HMAC validated.
1731                                                                                 res = Some(msgs::HTLCFailChannelUpdate::ChannelClosed {
1732                                                                                         short_channel_id: route_hop.short_channel_id
1733                                                                                 });
1734                                                                         },
1735                                                                         _ => {}, //TODO: Enumerate all of these!
1736                                                                 }
1737                                                         }
1738                                                 }
1739                                         }
1740                                 }).unwrap();
1741                                 Ok(res)
1742                         },
1743                         _ => { Ok(None) },
1744                 }
1745         }
1746
1747         fn internal_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) -> Result<(), MsgHandleErrInternal> {
1748                 let mut channel_state = self.channel_state.lock().unwrap();
1749                 match channel_state.by_id.get_mut(&msg.channel_id) {
1750                         Some(chan) => {
1751                                 if chan.get_their_node_id() != *their_node_id {
1752                                         //TODO: here and below MsgHandleErrInternal, #153 case
1753                                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1754                                 }
1755                                 chan.update_fail_malformed_htlc(&msg, HTLCFailReason::Reason { failure_code: msg.failure_code, data: Vec::new() }).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))?;
1756                                 Ok(())
1757                         },
1758                         None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1759                 }
1760         }
1761
1762         fn internal_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>), MsgHandleErrInternal> {
1763                 let (revoke_and_ack, commitment_signed, chan_monitor) = {
1764                         let mut channel_state = self.channel_state.lock().unwrap();
1765                         match channel_state.by_id.get_mut(&msg.channel_id) {
1766                                 Some(chan) => {
1767                                         if chan.get_their_node_id() != *their_node_id {
1768                                                 //TODO: here and below MsgHandleErrInternal, #153 case
1769                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1770                                         }
1771                                         chan.commitment_signed(&msg).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))?
1772                                 },
1773                                 None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1774                         }
1775                 };
1776                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1777                         unimplemented!();
1778                 }
1779
1780                 Ok((revoke_and_ack, commitment_signed))
1781         }
1782
1783         fn internal_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) -> Result<Option<msgs::CommitmentUpdate>, MsgHandleErrInternal> {
1784                 let ((res, mut pending_forwards, mut pending_failures, chan_monitor), short_channel_id) = {
1785                         let mut channel_state = self.channel_state.lock().unwrap();
1786                         match channel_state.by_id.get_mut(&msg.channel_id) {
1787                                 Some(chan) => {
1788                                         if chan.get_their_node_id() != *their_node_id {
1789                                                 //TODO: here and below MsgHandleErrInternal, #153 case
1790                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1791                                         }
1792                                         (chan.revoke_and_ack(&msg).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))?, chan.get_short_channel_id().expect("RAA should only work on a short-id-available channel"))
1793                                 },
1794                                 None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1795                         }
1796                 };
1797                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1798                         unimplemented!();
1799                 }
1800                 for failure in pending_failures.drain(..) {
1801                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), failure.0, &failure.1, failure.2);
1802                 }
1803
1804                 let mut forward_event = None;
1805                 if !pending_forwards.is_empty() {
1806                         let mut channel_state = self.channel_state.lock().unwrap();
1807                         if channel_state.forward_htlcs.is_empty() {
1808                                 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));
1809                                 channel_state.next_forward = forward_event.unwrap();
1810                         }
1811                         for (forward_info, prev_htlc_id) in pending_forwards.drain(..) {
1812                                 match channel_state.forward_htlcs.entry(forward_info.short_channel_id) {
1813                                         hash_map::Entry::Occupied(mut entry) => {
1814                                                 entry.get_mut().push(HTLCForwardInfo { prev_short_channel_id: short_channel_id, prev_htlc_id, forward_info });
1815                                         },
1816                                         hash_map::Entry::Vacant(entry) => {
1817                                                 entry.insert(vec!(HTLCForwardInfo { prev_short_channel_id: short_channel_id, prev_htlc_id, forward_info }));
1818                                         }
1819                                 }
1820                         }
1821                 }
1822                 match forward_event {
1823                         Some(time) => {
1824                                 let mut pending_events = self.pending_events.lock().unwrap();
1825                                 pending_events.push(events::Event::PendingHTLCsForwardable {
1826                                         time_forwardable: time
1827                                 });
1828                         }
1829                         None => {},
1830                 }
1831
1832                 Ok(res)
1833         }
1834
1835         fn internal_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) -> Result<(), MsgHandleErrInternal> {
1836                 let mut channel_state = self.channel_state.lock().unwrap();
1837                 match channel_state.by_id.get_mut(&msg.channel_id) {
1838                         Some(chan) => {
1839                                 if chan.get_their_node_id() != *their_node_id {
1840                                         //TODO: here and below MsgHandleErrInternal, #153 case
1841                                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1842                                 }
1843                                 chan.update_fee(&*self.fee_estimator, &msg).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))
1844                         },
1845                         None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1846                 }
1847         }
1848
1849         fn internal_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) -> Result<(), MsgHandleErrInternal> {
1850                 let (chan_announcement, chan_update) = {
1851                         let mut channel_state = self.channel_state.lock().unwrap();
1852                         match channel_state.by_id.get_mut(&msg.channel_id) {
1853                                 Some(chan) => {
1854                                         if chan.get_their_node_id() != *their_node_id {
1855                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1856                                         }
1857                                         if !chan.is_usable() {
1858                                                 return Err(MsgHandleErrInternal::from_no_close(HandleError{err: "Got an announcement_signatures before we were ready for it", action: Some(msgs::ErrorAction::IgnoreError)}));
1859                                         }
1860
1861                                         let our_node_id = self.get_our_node_id();
1862                                         let (announcement, our_bitcoin_sig) = chan.get_channel_announcement(our_node_id.clone(), self.genesis_hash.clone())
1863                                                 .map_err(|e| MsgHandleErrInternal::from_maybe_close(e))?;
1864
1865                                         let were_node_one = announcement.node_id_1 == our_node_id;
1866                                         let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
1867                                         let bad_sig_action = MsgHandleErrInternal::send_err_msg_close_chan("Bad announcement_signatures node_signature", msg.channel_id);
1868                                         secp_call!(self.secp_ctx.verify(&msghash, &msg.node_signature, if were_node_one { &announcement.node_id_2 } else { &announcement.node_id_1 }), bad_sig_action);
1869                                         secp_call!(self.secp_ctx.verify(&msghash, &msg.bitcoin_signature, if were_node_one { &announcement.bitcoin_key_2 } else { &announcement.bitcoin_key_1 }), bad_sig_action);
1870
1871                                         let our_node_sig = self.secp_ctx.sign(&msghash, &self.our_network_key);
1872
1873                                         (msgs::ChannelAnnouncement {
1874                                                 node_signature_1: if were_node_one { our_node_sig } else { msg.node_signature },
1875                                                 node_signature_2: if were_node_one { msg.node_signature } else { our_node_sig },
1876                                                 bitcoin_signature_1: if were_node_one { our_bitcoin_sig } else { msg.bitcoin_signature },
1877                                                 bitcoin_signature_2: if were_node_one { msg.bitcoin_signature } else { our_bitcoin_sig },
1878                                                 contents: announcement,
1879                                         }, self.get_channel_update(chan).unwrap()) // can only fail if we're not in a ready state
1880                                 },
1881                                 None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1882                         }
1883                 };
1884                 let mut pending_events = self.pending_events.lock().unwrap();
1885                 pending_events.push(events::Event::BroadcastChannelAnnouncement { msg: chan_announcement, update_msg: chan_update });
1886                 Ok(())
1887         }
1888
1889         fn internal_channel_reestablish(&self, their_node_id: &PublicKey, msg: &msgs::ChannelReestablish) -> Result<(Option<msgs::FundingLocked>, Option<msgs::RevokeAndACK>, Option<msgs::CommitmentUpdate>), MsgHandleErrInternal> {
1890                 let (res, chan_monitor) = {
1891                         let mut channel_state = self.channel_state.lock().unwrap();
1892                         match channel_state.by_id.get_mut(&msg.channel_id) {
1893                                 Some(chan) => {
1894                                         if chan.get_their_node_id() != *their_node_id {
1895                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1896                                         }
1897                                         let (funding_locked, revoke_and_ack, commitment_update, channel_monitor) = chan.channel_reestablish(msg).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))?;
1898                                         (Ok((funding_locked, revoke_and_ack, commitment_update)), channel_monitor)
1899                                 },
1900                                 None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1901                         }
1902                 };
1903                 if let Some(monitor) = chan_monitor {
1904                         if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor) {
1905                                 unimplemented!();
1906                         }
1907                 }
1908                 res
1909         }
1910 }
1911
1912 impl events::EventsProvider for ChannelManager {
1913         fn get_and_clear_pending_events(&self) -> Vec<events::Event> {
1914                 let mut pending_events = self.pending_events.lock().unwrap();
1915                 let mut ret = Vec::new();
1916                 mem::swap(&mut ret, &mut *pending_events);
1917                 ret
1918         }
1919 }
1920
1921 impl ChainListener for ChannelManager {
1922         fn block_connected(&self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) {
1923                 let mut new_events = Vec::new();
1924                 let mut failed_channels = Vec::new();
1925                 {
1926                         let mut channel_lock = self.channel_state.lock().unwrap();
1927                         let channel_state = channel_lock.borrow_parts();
1928                         let short_to_id = channel_state.short_to_id;
1929                         channel_state.by_id.retain(|_, channel| {
1930                                 let chan_res = channel.block_connected(header, height, txn_matched, indexes_of_txn_matched);
1931                                 if let Ok(Some(funding_locked)) = chan_res {
1932                                         let announcement_sigs = self.get_announcement_sigs(channel);
1933                                         new_events.push(events::Event::SendFundingLocked {
1934                                                 node_id: channel.get_their_node_id(),
1935                                                 msg: funding_locked,
1936                                                 announcement_sigs: announcement_sigs
1937                                         });
1938                                         short_to_id.insert(channel.get_short_channel_id().unwrap(), channel.channel_id());
1939                                 } else if let Err(e) = chan_res {
1940                                         new_events.push(events::Event::HandleError {
1941                                                 node_id: channel.get_their_node_id(),
1942                                                 action: e.action,
1943                                         });
1944                                         if channel.is_shutdown() {
1945                                                 return false;
1946                                         }
1947                                 }
1948                                 if let Some(funding_txo) = channel.get_funding_txo() {
1949                                         for tx in txn_matched {
1950                                                 for inp in tx.input.iter() {
1951                                                         if inp.previous_output == funding_txo.into_bitcoin_outpoint() {
1952                                                                 if let Some(short_id) = channel.get_short_channel_id() {
1953                                                                         short_to_id.remove(&short_id);
1954                                                                 }
1955                                                                 // It looks like our counterparty went on-chain. We go ahead and
1956                                                                 // broadcast our latest local state as well here, just in case its
1957                                                                 // some kind of SPV attack, though we expect these to be dropped.
1958                                                                 failed_channels.push(channel.force_shutdown());
1959                                                                 if let Ok(update) = self.get_channel_update(&channel) {
1960                                                                         new_events.push(events::Event::BroadcastChannelUpdate {
1961                                                                                 msg: update
1962                                                                         });
1963                                                                 }
1964                                                                 return false;
1965                                                         }
1966                                                 }
1967                                         }
1968                                 }
1969                                 if channel.is_funding_initiated() && channel.channel_monitor().would_broadcast_at_height(height) {
1970                                         if let Some(short_id) = channel.get_short_channel_id() {
1971                                                 short_to_id.remove(&short_id);
1972                                         }
1973                                         failed_channels.push(channel.force_shutdown());
1974                                         // If would_broadcast_at_height() is true, the channel_monitor will broadcast
1975                                         // the latest local tx for us, so we should skip that here (it doesn't really
1976                                         // hurt anything, but does make tests a bit simpler).
1977                                         failed_channels.last_mut().unwrap().0 = Vec::new();
1978                                         if let Ok(update) = self.get_channel_update(&channel) {
1979                                                 new_events.push(events::Event::BroadcastChannelUpdate {
1980                                                         msg: update
1981                                                 });
1982                                         }
1983                                         return false;
1984                                 }
1985                                 true
1986                         });
1987                 }
1988                 for failure in failed_channels.drain(..) {
1989                         self.finish_force_close_channel(failure);
1990                 }
1991                 let mut pending_events = self.pending_events.lock().unwrap();
1992                 for funding_locked in new_events.drain(..) {
1993                         pending_events.push(funding_locked);
1994                 }
1995                 self.latest_block_height.store(height as usize, Ordering::Release);
1996         }
1997
1998         /// We force-close the channel without letting our counterparty participate in the shutdown
1999         fn block_disconnected(&self, header: &BlockHeader) {
2000                 let mut new_events = Vec::new();
2001                 let mut failed_channels = Vec::new();
2002                 {
2003                         let mut channel_lock = self.channel_state.lock().unwrap();
2004                         let channel_state = channel_lock.borrow_parts();
2005                         let short_to_id = channel_state.short_to_id;
2006                         channel_state.by_id.retain(|_,  v| {
2007                                 if v.block_disconnected(header) {
2008                                         if let Some(short_id) = v.get_short_channel_id() {
2009                                                 short_to_id.remove(&short_id);
2010                                         }
2011                                         failed_channels.push(v.force_shutdown());
2012                                         if let Ok(update) = self.get_channel_update(&v) {
2013                                                 new_events.push(events::Event::BroadcastChannelUpdate {
2014                                                         msg: update
2015                                                 });
2016                                         }
2017                                         false
2018                                 } else {
2019                                         true
2020                                 }
2021                         });
2022                 }
2023                 for failure in failed_channels.drain(..) {
2024                         self.finish_force_close_channel(failure);
2025                 }
2026                 if !new_events.is_empty() {
2027                         let mut pending_events = self.pending_events.lock().unwrap();
2028                         for funding_locked in new_events.drain(..) {
2029                                 pending_events.push(funding_locked);
2030                         }
2031                 }
2032                 self.latest_block_height.fetch_sub(1, Ordering::AcqRel);
2033         }
2034 }
2035
2036 macro_rules! handle_error {
2037         ($self: ident, $internal: expr, $their_node_id: expr) => {
2038                 match $internal {
2039                         Ok(msg) => Ok(msg),
2040                         Err(MsgHandleErrInternal { err, needs_channel_force_close }) => {
2041                                 if needs_channel_force_close {
2042                                         match &err.action {
2043                                                 &Some(msgs::ErrorAction::DisconnectPeer { msg: Some(ref msg) }) => {
2044                                                         if msg.channel_id == [0; 32] {
2045                                                                 $self.peer_disconnected(&$their_node_id, true);
2046                                                         } else {
2047                                                                 $self.force_close_channel(&msg.channel_id);
2048                                                         }
2049                                                 },
2050                                                 &Some(msgs::ErrorAction::DisconnectPeer { msg: None }) => {},
2051                                                 &Some(msgs::ErrorAction::IgnoreError) => {},
2052                                                 &Some(msgs::ErrorAction::SendErrorMessage { ref msg }) => {
2053                                                         if msg.channel_id == [0; 32] {
2054                                                                 $self.peer_disconnected(&$their_node_id, true);
2055                                                         } else {
2056                                                                 $self.force_close_channel(&msg.channel_id);
2057                                                         }
2058                                                 },
2059                                                 &None => {},
2060                                         }
2061                                 }
2062                                 Err(err)
2063                         },
2064                 }
2065         }
2066 }
2067
2068 impl ChannelMessageHandler for ChannelManager {
2069         //TODO: Handle errors and close channel (or so)
2070         fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &msgs::OpenChannel) -> Result<msgs::AcceptChannel, HandleError> {
2071                 handle_error!(self, self.internal_open_channel(their_node_id, msg), their_node_id)
2072         }
2073
2074         fn handle_accept_channel(&self, their_node_id: &PublicKey, msg: &msgs::AcceptChannel) -> Result<(), HandleError> {
2075                 handle_error!(self, self.internal_accept_channel(their_node_id, msg), their_node_id)
2076         }
2077
2078         fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) -> Result<msgs::FundingSigned, HandleError> {
2079                 handle_error!(self, self.internal_funding_created(their_node_id, msg), their_node_id)
2080         }
2081
2082         fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) -> Result<(), HandleError> {
2083                 handle_error!(self, self.internal_funding_signed(their_node_id, msg), their_node_id)
2084         }
2085
2086         fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &msgs::FundingLocked) -> Result<Option<msgs::AnnouncementSignatures>, HandleError> {
2087                 handle_error!(self, self.internal_funding_locked(their_node_id, msg), their_node_id)
2088         }
2089
2090         fn handle_shutdown(&self, their_node_id: &PublicKey, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>), HandleError> {
2091                 handle_error!(self, self.internal_shutdown(their_node_id, msg), their_node_id)
2092         }
2093
2094         fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &msgs::ClosingSigned) -> Result<Option<msgs::ClosingSigned>, HandleError> {
2095                 handle_error!(self, self.internal_closing_signed(their_node_id, msg), their_node_id)
2096         }
2097
2098         fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) -> Result<(), msgs::HandleError> {
2099                 handle_error!(self, self.internal_update_add_htlc(their_node_id, msg), their_node_id)
2100         }
2101
2102         fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) -> Result<(), HandleError> {
2103                 handle_error!(self, self.internal_update_fulfill_htlc(their_node_id, msg), their_node_id)
2104         }
2105
2106         fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) -> Result<Option<msgs::HTLCFailChannelUpdate>, HandleError> {
2107                 handle_error!(self, self.internal_update_fail_htlc(their_node_id, msg), their_node_id)
2108         }
2109
2110         fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) -> Result<(), HandleError> {
2111                 handle_error!(self, self.internal_update_fail_malformed_htlc(their_node_id, msg), their_node_id)
2112         }
2113
2114         fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>), HandleError> {
2115                 handle_error!(self, self.internal_commitment_signed(their_node_id, msg), their_node_id)
2116         }
2117
2118         fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) -> Result<Option<msgs::CommitmentUpdate>, HandleError> {
2119                 handle_error!(self, self.internal_revoke_and_ack(their_node_id, msg), their_node_id)
2120         }
2121
2122         fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) -> Result<(), HandleError> {
2123                 handle_error!(self, self.internal_update_fee(their_node_id, msg), their_node_id)
2124         }
2125
2126         fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) -> Result<(), HandleError> {
2127                 handle_error!(self, self.internal_announcement_signatures(their_node_id, msg), their_node_id)
2128         }
2129
2130         fn handle_channel_reestablish(&self, their_node_id: &PublicKey, msg: &msgs::ChannelReestablish) -> Result<(Option<msgs::FundingLocked>, Option<msgs::RevokeAndACK>, Option<msgs::CommitmentUpdate>), HandleError> {
2131                 handle_error!(self, self.internal_channel_reestablish(their_node_id, msg), their_node_id)
2132         }
2133
2134         fn peer_disconnected(&self, their_node_id: &PublicKey, no_connection_possible: bool) {
2135                 let mut new_events = Vec::new();
2136                 let mut failed_channels = Vec::new();
2137                 let mut failed_payments = Vec::new();
2138                 {
2139                         let mut channel_state_lock = self.channel_state.lock().unwrap();
2140                         let channel_state = channel_state_lock.borrow_parts();
2141                         let short_to_id = channel_state.short_to_id;
2142                         if no_connection_possible {
2143                                 channel_state.by_id.retain(|_, chan| {
2144                                         if chan.get_their_node_id() == *their_node_id {
2145                                                 if let Some(short_id) = chan.get_short_channel_id() {
2146                                                         short_to_id.remove(&short_id);
2147                                                 }
2148                                                 failed_channels.push(chan.force_shutdown());
2149                                                 if let Ok(update) = self.get_channel_update(&chan) {
2150                                                         new_events.push(events::Event::BroadcastChannelUpdate {
2151                                                                 msg: update
2152                                                         });
2153                                                 }
2154                                                 false
2155                                         } else {
2156                                                 true
2157                                         }
2158                                 });
2159                         } else {
2160                                 channel_state.by_id.retain(|_, chan| {
2161                                         if chan.get_their_node_id() == *their_node_id {
2162                                                 //TODO: mark channel disabled (and maybe announce such after a timeout).
2163                                                 let failed_adds = chan.remove_uncommitted_htlcs_and_mark_paused();
2164                                                 if !failed_adds.is_empty() {
2165                                                         let chan_update = self.get_channel_update(&chan).map(|u| u.encode_with_len()).unwrap(); // Cannot add/recv HTLCs before we have a short_id so unwrap is safe
2166                                                         failed_payments.push((chan_update, failed_adds));
2167                                                 }
2168                                                 if chan.is_shutdown() {
2169                                                         if let Some(short_id) = chan.get_short_channel_id() {
2170                                                                 short_to_id.remove(&short_id);
2171                                                         }
2172                                                         return false;
2173                                                 }
2174                                         }
2175                                         true
2176                                 })
2177                         }
2178                 }
2179                 for failure in failed_channels.drain(..) {
2180                         self.finish_force_close_channel(failure);
2181                 }
2182                 if !new_events.is_empty() {
2183                         let mut pending_events = self.pending_events.lock().unwrap();
2184                         for event in new_events.drain(..) {
2185                                 pending_events.push(event);
2186                         }
2187                 }
2188                 for (chan_update, mut htlc_sources) in failed_payments {
2189                         for (htlc_source, payment_hash) in htlc_sources.drain(..) {
2190                                 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source, &payment_hash, HTLCFailReason::Reason { failure_code: 0x1000 | 7, data: chan_update.clone() });
2191                         }
2192                 }
2193         }
2194
2195         fn peer_connected(&self, their_node_id: &PublicKey) -> Vec<msgs::ChannelReestablish> {
2196                 let mut res = Vec::new();
2197                 let mut channel_state = self.channel_state.lock().unwrap();
2198                 channel_state.by_id.retain(|_, chan| {
2199                         if chan.get_their_node_id() == *their_node_id {
2200                                 if !chan.have_received_message() {
2201                                         // If we created this (outbound) channel while we were disconnected from the
2202                                         // peer we probably failed to send the open_channel message, which is now
2203                                         // lost. We can't have had anything pending related to this channel, so we just
2204                                         // drop it.
2205                                         false
2206                                 } else {
2207                                         res.push(chan.get_channel_reestablish());
2208                                         true
2209                                 }
2210                         } else { true }
2211                 });
2212                 //TODO: Also re-broadcast announcement_signatures
2213                 res
2214         }
2215
2216         fn handle_error(&self, their_node_id: &PublicKey, msg: &msgs::ErrorMessage) {
2217                 if msg.channel_id == [0; 32] {
2218                         for chan in self.list_channels() {
2219                                 if chan.remote_network_id == *their_node_id {
2220                                         self.force_close_channel(&chan.channel_id);
2221                                 }
2222                         }
2223                 } else {
2224                         self.force_close_channel(&msg.channel_id);
2225                 }
2226         }
2227 }
2228
2229 #[cfg(test)]
2230 mod tests {
2231         use chain::chaininterface;
2232         use chain::transaction::OutPoint;
2233         use chain::chaininterface::ChainListener;
2234         use ln::channelmanager::{ChannelManager,OnionKeys};
2235         use ln::router::{Route, RouteHop, Router};
2236         use ln::msgs;
2237         use ln::msgs::{ChannelMessageHandler,RoutingMessageHandler};
2238         use util::test_utils;
2239         use util::events::{Event, EventsProvider};
2240         use util::errors::APIError;
2241         use util::logger::Logger;
2242         use util::ser::Writeable;
2243
2244         use bitcoin::util::hash::Sha256dHash;
2245         use bitcoin::blockdata::block::{Block, BlockHeader};
2246         use bitcoin::blockdata::transaction::{Transaction, TxOut};
2247         use bitcoin::blockdata::constants::genesis_block;
2248         use bitcoin::network::constants::Network;
2249         use bitcoin::network::serialize::serialize;
2250         use bitcoin::network::serialize::BitcoinHash;
2251
2252         use hex;
2253
2254         use secp256k1::{Secp256k1, Message};
2255         use secp256k1::key::{PublicKey,SecretKey};
2256
2257         use crypto::sha2::Sha256;
2258         use crypto::digest::Digest;
2259
2260         use rand::{thread_rng,Rng};
2261
2262         use std::cell::RefCell;
2263         use std::collections::HashMap;
2264         use std::default::Default;
2265         use std::rc::Rc;
2266         use std::sync::{Arc, Mutex};
2267         use std::time::Instant;
2268         use std::mem;
2269
2270         fn build_test_onion_keys() -> Vec<OnionKeys> {
2271                 // Keys from BOLT 4, used in both test vector tests
2272                 let secp_ctx = Secp256k1::new();
2273
2274                 let route = Route {
2275                         hops: vec!(
2276                                         RouteHop {
2277                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]).unwrap(),
2278                                                 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
2279                                         },
2280                                         RouteHop {
2281                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("0324653eac434488002cc06bbfb7f10fe18991e35f9fe4302dbea6d2353dc0ab1c").unwrap()[..]).unwrap(),
2282                                                 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
2283                                         },
2284                                         RouteHop {
2285                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("027f31ebc5462c1fdce1b737ecff52d37d75dea43ce11c74d25aa297165faa2007").unwrap()[..]).unwrap(),
2286                                                 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
2287                                         },
2288                                         RouteHop {
2289                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]).unwrap(),
2290                                                 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
2291                                         },
2292                                         RouteHop {
2293                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("02edabbd16b41c8371b92ef2f04c1185b4f03b6dcd52ba9b78d9d7c89c8f221145").unwrap()[..]).unwrap(),
2294                                                 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
2295                                         },
2296                         ),
2297                 };
2298
2299                 let session_priv = SecretKey::from_slice(&secp_ctx, &hex::decode("4141414141414141414141414141414141414141414141414141414141414141").unwrap()[..]).unwrap();
2300
2301                 let onion_keys = ChannelManager::construct_onion_keys(&secp_ctx, &route, &session_priv).unwrap();
2302                 assert_eq!(onion_keys.len(), route.hops.len());
2303                 onion_keys
2304         }
2305
2306         #[test]
2307         fn onion_vectors() {
2308                 // Packet creation test vectors from BOLT 4
2309                 let onion_keys = build_test_onion_keys();
2310
2311                 assert_eq!(onion_keys[0].shared_secret[..], hex::decode("53eb63ea8a3fec3b3cd433b85cd62a4b145e1dda09391b348c4e1cd36a03ea66").unwrap()[..]);
2312                 assert_eq!(onion_keys[0].blinding_factor[..], hex::decode("2ec2e5da605776054187180343287683aa6a51b4b1c04d6dd49c45d8cffb3c36").unwrap()[..]);
2313                 assert_eq!(onion_keys[0].ephemeral_pubkey.serialize()[..], hex::decode("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]);
2314                 assert_eq!(onion_keys[0].rho, hex::decode("ce496ec94def95aadd4bec15cdb41a740c9f2b62347c4917325fcc6fb0453986").unwrap()[..]);
2315                 assert_eq!(onion_keys[0].mu, hex::decode("b57061dc6d0a2b9f261ac410c8b26d64ac5506cbba30267a649c28c179400eba").unwrap()[..]);
2316
2317                 assert_eq!(onion_keys[1].shared_secret[..], hex::decode("a6519e98832a0b179f62123b3567c106db99ee37bef036e783263602f3488fae").unwrap()[..]);
2318                 assert_eq!(onion_keys[1].blinding_factor[..], hex::decode("bf66c28bc22e598cfd574a1931a2bafbca09163df2261e6d0056b2610dab938f").unwrap()[..]);
2319                 assert_eq!(onion_keys[1].ephemeral_pubkey.serialize()[..], hex::decode("028f9438bfbf7feac2e108d677e3a82da596be706cc1cf342b75c7b7e22bf4e6e2").unwrap()[..]);
2320                 assert_eq!(onion_keys[1].rho, hex::decode("450ffcabc6449094918ebe13d4f03e433d20a3d28a768203337bc40b6e4b2c59").unwrap()[..]);
2321                 assert_eq!(onion_keys[1].mu, hex::decode("05ed2b4a3fb023c2ff5dd6ed4b9b6ea7383f5cfe9d59c11d121ec2c81ca2eea9").unwrap()[..]);
2322
2323                 assert_eq!(onion_keys[2].shared_secret[..], hex::decode("3a6b412548762f0dbccce5c7ae7bb8147d1caf9b5471c34120b30bc9c04891cc").unwrap()[..]);
2324                 assert_eq!(onion_keys[2].blinding_factor[..], hex::decode("a1f2dadd184eb1627049673f18c6325814384facdee5bfd935d9cb031a1698a5").unwrap()[..]);
2325                 assert_eq!(onion_keys[2].ephemeral_pubkey.serialize()[..], hex::decode("03bfd8225241ea71cd0843db7709f4c222f62ff2d4516fd38b39914ab6b83e0da0").unwrap()[..]);
2326                 assert_eq!(onion_keys[2].rho, hex::decode("11bf5c4f960239cb37833936aa3d02cea82c0f39fd35f566109c41f9eac8deea").unwrap()[..]);
2327                 assert_eq!(onion_keys[2].mu, hex::decode("caafe2820fa00eb2eeb78695ae452eba38f5a53ed6d53518c5c6edf76f3f5b78").unwrap()[..]);
2328
2329                 assert_eq!(onion_keys[3].shared_secret[..], hex::decode("21e13c2d7cfe7e18836df50872466117a295783ab8aab0e7ecc8c725503ad02d").unwrap()[..]);
2330                 assert_eq!(onion_keys[3].blinding_factor[..], hex::decode("7cfe0b699f35525029ae0fa437c69d0f20f7ed4e3916133f9cacbb13c82ff262").unwrap()[..]);
2331                 assert_eq!(onion_keys[3].ephemeral_pubkey.serialize()[..], hex::decode("031dde6926381289671300239ea8e57ffaf9bebd05b9a5b95beaf07af05cd43595").unwrap()[..]);
2332                 assert_eq!(onion_keys[3].rho, hex::decode("cbe784ab745c13ff5cffc2fbe3e84424aa0fd669b8ead4ee562901a4a4e89e9e").unwrap()[..]);
2333                 assert_eq!(onion_keys[3].mu, hex::decode("5052aa1b3d9f0655a0932e50d42f0c9ba0705142c25d225515c45f47c0036ee9").unwrap()[..]);
2334
2335                 assert_eq!(onion_keys[4].shared_secret[..], hex::decode("b5756b9b542727dbafc6765a49488b023a725d631af688fc031217e90770c328").unwrap()[..]);
2336                 assert_eq!(onion_keys[4].blinding_factor[..], hex::decode("c96e00dddaf57e7edcd4fb5954be5b65b09f17cb6d20651b4e90315be5779205").unwrap()[..]);
2337                 assert_eq!(onion_keys[4].ephemeral_pubkey.serialize()[..], hex::decode("03a214ebd875aab6ddfd77f22c5e7311d7f77f17a169e599f157bbcdae8bf071f4").unwrap()[..]);
2338                 assert_eq!(onion_keys[4].rho, hex::decode("034e18b8cc718e8af6339106e706c52d8df89e2b1f7e9142d996acf88df8799b").unwrap()[..]);
2339                 assert_eq!(onion_keys[4].mu, hex::decode("8e45e5c61c2b24cb6382444db6698727afb063adecd72aada233d4bf273d975a").unwrap()[..]);
2340
2341                 // Test vectors below are flat-out wrong: they claim to set outgoing_cltv_value to non-0 :/
2342                 let payloads = vec!(
2343                         msgs::OnionHopData {
2344                                 realm: 0,
2345                                 data: msgs::OnionRealm0HopData {
2346                                         short_channel_id: 0,
2347                                         amt_to_forward: 0,
2348                                         outgoing_cltv_value: 0,
2349                                 },
2350                                 hmac: [0; 32],
2351                         },
2352                         msgs::OnionHopData {
2353                                 realm: 0,
2354                                 data: msgs::OnionRealm0HopData {
2355                                         short_channel_id: 0x0101010101010101,
2356                                         amt_to_forward: 0x0100000001,
2357                                         outgoing_cltv_value: 0,
2358                                 },
2359                                 hmac: [0; 32],
2360                         },
2361                         msgs::OnionHopData {
2362                                 realm: 0,
2363                                 data: msgs::OnionRealm0HopData {
2364                                         short_channel_id: 0x0202020202020202,
2365                                         amt_to_forward: 0x0200000002,
2366                                         outgoing_cltv_value: 0,
2367                                 },
2368                                 hmac: [0; 32],
2369                         },
2370                         msgs::OnionHopData {
2371                                 realm: 0,
2372                                 data: msgs::OnionRealm0HopData {
2373                                         short_channel_id: 0x0303030303030303,
2374                                         amt_to_forward: 0x0300000003,
2375                                         outgoing_cltv_value: 0,
2376                                 },
2377                                 hmac: [0; 32],
2378                         },
2379                         msgs::OnionHopData {
2380                                 realm: 0,
2381                                 data: msgs::OnionRealm0HopData {
2382                                         short_channel_id: 0x0404040404040404,
2383                                         amt_to_forward: 0x0400000004,
2384                                         outgoing_cltv_value: 0,
2385                                 },
2386                                 hmac: [0; 32],
2387                         },
2388                 );
2389
2390                 let packet = ChannelManager::construct_onion_packet(payloads, onion_keys, &[0x42; 32]);
2391                 // Just check the final packet encoding, as it includes all the per-hop vectors in it
2392                 // anyway...
2393                 assert_eq!(packet.encode(), hex::decode("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").unwrap());
2394         }
2395
2396         #[test]
2397         fn test_failure_packet_onion() {
2398                 // Returning Errors test vectors from BOLT 4
2399
2400                 let onion_keys = build_test_onion_keys();
2401                 let onion_error = ChannelManager::build_failure_packet(&onion_keys[4].shared_secret, 0x2002, &[0; 0]);
2402                 assert_eq!(onion_error.encode(), hex::decode("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").unwrap());
2403
2404                 let onion_packet_1 = ChannelManager::encrypt_failure_packet(&onion_keys[4].shared_secret, &onion_error.encode()[..]);
2405                 assert_eq!(onion_packet_1.data, hex::decode("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").unwrap());
2406
2407                 let onion_packet_2 = ChannelManager::encrypt_failure_packet(&onion_keys[3].shared_secret, &onion_packet_1.data[..]);
2408                 assert_eq!(onion_packet_2.data, hex::decode("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").unwrap());
2409
2410                 let onion_packet_3 = ChannelManager::encrypt_failure_packet(&onion_keys[2].shared_secret, &onion_packet_2.data[..]);
2411                 assert_eq!(onion_packet_3.data, hex::decode("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").unwrap());
2412
2413                 let onion_packet_4 = ChannelManager::encrypt_failure_packet(&onion_keys[1].shared_secret, &onion_packet_3.data[..]);
2414                 assert_eq!(onion_packet_4.data, hex::decode("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").unwrap());
2415
2416                 let onion_packet_5 = ChannelManager::encrypt_failure_packet(&onion_keys[0].shared_secret, &onion_packet_4.data[..]);
2417                 assert_eq!(onion_packet_5.data, hex::decode("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").unwrap());
2418         }
2419
2420         fn confirm_transaction(chain: &chaininterface::ChainWatchInterfaceUtil, tx: &Transaction, chan_id: u32) {
2421                 assert!(chain.does_match_tx(tx));
2422                 let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2423                 chain.block_connected_checked(&header, 1, &[tx; 1], &[chan_id; 1]);
2424                 for i in 2..100 {
2425                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2426                         chain.block_connected_checked(&header, i, &[tx; 0], &[0; 0]);
2427                 }
2428         }
2429
2430         struct Node {
2431                 chain_monitor: Arc<chaininterface::ChainWatchInterfaceUtil>,
2432                 tx_broadcaster: Arc<test_utils::TestBroadcaster>,
2433                 chan_monitor: Arc<test_utils::TestChannelMonitor>,
2434                 node: Arc<ChannelManager>,
2435                 router: Router,
2436                 network_payment_count: Rc<RefCell<u8>>,
2437                 network_chan_count: Rc<RefCell<u32>>,
2438         }
2439         impl Drop for Node {
2440                 fn drop(&mut self) {
2441                         // Check that we processed all pending events
2442                         assert_eq!(self.node.get_and_clear_pending_events().len(), 0);
2443                         assert_eq!(self.chan_monitor.added_monitors.lock().unwrap().len(), 0);
2444                 }
2445         }
2446
2447         fn create_chan_between_nodes(node_a: &Node, node_b: &Node) -> (msgs::ChannelAnnouncement, msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction) {
2448                 node_a.node.create_channel(node_b.node.get_our_node_id(), 100000, 10001, 42).unwrap();
2449
2450                 let events_1 = node_a.node.get_and_clear_pending_events();
2451                 assert_eq!(events_1.len(), 1);
2452                 let accept_chan = match events_1[0] {
2453                         Event::SendOpenChannel { ref node_id, ref msg } => {
2454                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2455                                 node_b.node.handle_open_channel(&node_a.node.get_our_node_id(), msg).unwrap()
2456                         },
2457                         _ => panic!("Unexpected event"),
2458                 };
2459
2460                 node_a.node.handle_accept_channel(&node_b.node.get_our_node_id(), &accept_chan).unwrap();
2461
2462                 let chan_id = *node_a.network_chan_count.borrow();
2463                 let tx;
2464                 let funding_output;
2465
2466                 let events_2 = node_a.node.get_and_clear_pending_events();
2467                 assert_eq!(events_2.len(), 1);
2468                 match events_2[0] {
2469                         Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, user_channel_id } => {
2470                                 assert_eq!(*channel_value_satoshis, 100000);
2471                                 assert_eq!(user_channel_id, 42);
2472
2473                                 tx = Transaction { version: chan_id as u32, lock_time: 0, input: Vec::new(), output: vec![TxOut {
2474                                         value: *channel_value_satoshis, script_pubkey: output_script.clone(),
2475                                 }]};
2476                                 funding_output = OutPoint::new(Sha256dHash::from_data(&serialize(&tx).unwrap()[..]), 0);
2477
2478                                 node_a.node.funding_transaction_generated(&temporary_channel_id, funding_output);
2479                                 let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
2480                                 assert_eq!(added_monitors.len(), 1);
2481                                 assert_eq!(added_monitors[0].0, funding_output);
2482                                 added_monitors.clear();
2483                         },
2484                         _ => panic!("Unexpected event"),
2485                 }
2486
2487                 let events_3 = node_a.node.get_and_clear_pending_events();
2488                 assert_eq!(events_3.len(), 1);
2489                 let funding_signed = match events_3[0] {
2490                         Event::SendFundingCreated { ref node_id, ref msg } => {
2491                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2492                                 let res = node_b.node.handle_funding_created(&node_a.node.get_our_node_id(), msg).unwrap();
2493                                 let mut added_monitors = node_b.chan_monitor.added_monitors.lock().unwrap();
2494                                 assert_eq!(added_monitors.len(), 1);
2495                                 assert_eq!(added_monitors[0].0, funding_output);
2496                                 added_monitors.clear();
2497                                 res
2498                         },
2499                         _ => panic!("Unexpected event"),
2500                 };
2501
2502                 node_a.node.handle_funding_signed(&node_b.node.get_our_node_id(), &funding_signed).unwrap();
2503                 {
2504                         let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
2505                         assert_eq!(added_monitors.len(), 1);
2506                         assert_eq!(added_monitors[0].0, funding_output);
2507                         added_monitors.clear();
2508                 }
2509
2510                 let events_4 = node_a.node.get_and_clear_pending_events();
2511                 assert_eq!(events_4.len(), 1);
2512                 match events_4[0] {
2513                         Event::FundingBroadcastSafe { ref funding_txo, user_channel_id } => {
2514                                 assert_eq!(user_channel_id, 42);
2515                                 assert_eq!(*funding_txo, funding_output);
2516                         },
2517                         _ => panic!("Unexpected event"),
2518                 };
2519
2520                 confirm_transaction(&node_a.chain_monitor, &tx, chan_id);
2521                 let events_5 = node_a.node.get_and_clear_pending_events();
2522                 assert_eq!(events_5.len(), 1);
2523                 match events_5[0] {
2524                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
2525                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2526                                 assert!(announcement_sigs.is_none());
2527                                 node_b.node.handle_funding_locked(&node_a.node.get_our_node_id(), msg).unwrap()
2528                         },
2529                         _ => panic!("Unexpected event"),
2530                 };
2531
2532                 let channel_id;
2533
2534                 confirm_transaction(&node_b.chain_monitor, &tx, chan_id);
2535                 let events_6 = node_b.node.get_and_clear_pending_events();
2536                 assert_eq!(events_6.len(), 1);
2537                 let as_announcement_sigs = match events_6[0] {
2538                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
2539                                 assert_eq!(*node_id, node_a.node.get_our_node_id());
2540                                 channel_id = msg.channel_id.clone();
2541                                 let as_announcement_sigs = node_a.node.handle_funding_locked(&node_b.node.get_our_node_id(), msg).unwrap().unwrap();
2542                                 node_a.node.handle_announcement_signatures(&node_b.node.get_our_node_id(), &(*announcement_sigs).clone().unwrap()).unwrap();
2543                                 as_announcement_sigs
2544                         },
2545                         _ => panic!("Unexpected event"),
2546                 };
2547
2548                 let events_7 = node_a.node.get_and_clear_pending_events();
2549                 assert_eq!(events_7.len(), 1);
2550                 let (announcement, as_update) = match events_7[0] {
2551                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
2552                                 (msg, update_msg)
2553                         },
2554                         _ => panic!("Unexpected event"),
2555                 };
2556
2557                 node_b.node.handle_announcement_signatures(&node_a.node.get_our_node_id(), &as_announcement_sigs).unwrap();
2558                 let events_8 = node_b.node.get_and_clear_pending_events();
2559                 assert_eq!(events_8.len(), 1);
2560                 let bs_update = match events_8[0] {
2561                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
2562                                 assert!(*announcement == *msg);
2563                                 update_msg
2564                         },
2565                         _ => panic!("Unexpected event"),
2566                 };
2567
2568                 *node_a.network_chan_count.borrow_mut() += 1;
2569
2570                 ((*announcement).clone(), (*as_update).clone(), (*bs_update).clone(), channel_id, tx)
2571         }
2572
2573         fn create_announced_chan_between_nodes(nodes: &Vec<Node>, a: usize, b: usize) -> (msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction) {
2574                 let chan_announcement = create_chan_between_nodes(&nodes[a], &nodes[b]);
2575                 for node in nodes {
2576                         assert!(node.router.handle_channel_announcement(&chan_announcement.0).unwrap());
2577                         node.router.handle_channel_update(&chan_announcement.1).unwrap();
2578                         node.router.handle_channel_update(&chan_announcement.2).unwrap();
2579                 }
2580                 (chan_announcement.1, chan_announcement.2, chan_announcement.3, chan_announcement.4)
2581         }
2582
2583         fn close_channel(outbound_node: &Node, inbound_node: &Node, channel_id: &[u8; 32], funding_tx: Transaction, close_inbound_first: bool) -> (msgs::ChannelUpdate, msgs::ChannelUpdate) {
2584                 let (node_a, broadcaster_a) = if close_inbound_first { (&inbound_node.node, &inbound_node.tx_broadcaster) } else { (&outbound_node.node, &outbound_node.tx_broadcaster) };
2585                 let (node_b, broadcaster_b) = if close_inbound_first { (&outbound_node.node, &outbound_node.tx_broadcaster) } else { (&inbound_node.node, &inbound_node.tx_broadcaster) };
2586                 let (tx_a, tx_b);
2587
2588                 node_a.close_channel(channel_id).unwrap();
2589                 let events_1 = node_a.get_and_clear_pending_events();
2590                 assert_eq!(events_1.len(), 1);
2591                 let shutdown_a = match events_1[0] {
2592                         Event::SendShutdown { ref node_id, ref msg } => {
2593                                 assert_eq!(node_id, &node_b.get_our_node_id());
2594                                 msg.clone()
2595                         },
2596                         _ => panic!("Unexpected event"),
2597                 };
2598
2599                 let (shutdown_b, mut closing_signed_b) = node_b.handle_shutdown(&node_a.get_our_node_id(), &shutdown_a).unwrap();
2600                 if !close_inbound_first {
2601                         assert!(closing_signed_b.is_none());
2602                 }
2603                 let (empty_a, mut closing_signed_a) = node_a.handle_shutdown(&node_b.get_our_node_id(), &shutdown_b.unwrap()).unwrap();
2604                 assert!(empty_a.is_none());
2605                 if close_inbound_first {
2606                         assert!(closing_signed_a.is_none());
2607                         closing_signed_a = node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
2608                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
2609                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
2610
2611                         let empty_b = node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
2612                         assert!(empty_b.is_none());
2613                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
2614                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
2615                 } else {
2616                         closing_signed_b = node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
2617                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
2618                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
2619
2620                         let empty_a2 = node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
2621                         assert!(empty_a2.is_none());
2622                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
2623                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
2624                 }
2625                 assert_eq!(tx_a, tx_b);
2626                 let mut funding_tx_map = HashMap::new();
2627                 funding_tx_map.insert(funding_tx.txid(), funding_tx);
2628                 tx_a.verify(&funding_tx_map).unwrap();
2629
2630                 let events_2 = node_a.get_and_clear_pending_events();
2631                 assert_eq!(events_2.len(), 1);
2632                 let as_update = match events_2[0] {
2633                         Event::BroadcastChannelUpdate { ref msg } => {
2634                                 msg.clone()
2635                         },
2636                         _ => panic!("Unexpected event"),
2637                 };
2638
2639                 let events_3 = node_b.get_and_clear_pending_events();
2640                 assert_eq!(events_3.len(), 1);
2641                 let bs_update = match events_3[0] {
2642                         Event::BroadcastChannelUpdate { ref msg } => {
2643                                 msg.clone()
2644                         },
2645                         _ => panic!("Unexpected event"),
2646                 };
2647
2648                 (as_update, bs_update)
2649         }
2650
2651         struct SendEvent {
2652                 node_id: PublicKey,
2653                 msgs: Vec<msgs::UpdateAddHTLC>,
2654                 commitment_msg: msgs::CommitmentSigned,
2655         }
2656         impl SendEvent {
2657                 fn from_event(event: Event) -> SendEvent {
2658                         match event {
2659                                 Event::UpdateHTLCs { node_id, updates: msgs::CommitmentUpdate { update_add_htlcs, update_fulfill_htlcs, update_fail_htlcs, update_fail_malformed_htlcs, commitment_signed } } => {
2660                                         assert!(update_fulfill_htlcs.is_empty());
2661                                         assert!(update_fail_htlcs.is_empty());
2662                                         assert!(update_fail_malformed_htlcs.is_empty());
2663                                         SendEvent { node_id: node_id, msgs: update_add_htlcs, commitment_msg: commitment_signed }
2664                                 },
2665                                 _ => panic!("Unexpected event type!"),
2666                         }
2667                 }
2668         }
2669
2670         macro_rules! commitment_signed_dance {
2671                 ($node_a: expr, $node_b: expr, $commitment_signed: expr, $fail_backwards: expr) => {
2672                         {
2673                                 {
2674                                         let added_monitors = $node_a.chan_monitor.added_monitors.lock().unwrap();
2675                                         assert!(added_monitors.is_empty());
2676                                 }
2677                                 let (as_revoke_and_ack, as_commitment_signed) = $node_a.node.handle_commitment_signed(&$node_b.node.get_our_node_id(), &$commitment_signed).unwrap();
2678                                 {
2679                                         let mut added_monitors = $node_a.chan_monitor.added_monitors.lock().unwrap();
2680                                         assert_eq!(added_monitors.len(), 1);
2681                                         added_monitors.clear();
2682                                 }
2683                                 {
2684                                         let added_monitors = $node_b.chan_monitor.added_monitors.lock().unwrap();
2685                                         assert!(added_monitors.is_empty());
2686                                 }
2687                                 assert!($node_b.node.handle_revoke_and_ack(&$node_a.node.get_our_node_id(), &as_revoke_and_ack).unwrap().is_none());
2688                                 {
2689                                         let mut added_monitors = $node_b.chan_monitor.added_monitors.lock().unwrap();
2690                                         assert_eq!(added_monitors.len(), 1);
2691                                         added_monitors.clear();
2692                                 }
2693                                 let (bs_revoke_and_ack, bs_none) = $node_b.node.handle_commitment_signed(&$node_a.node.get_our_node_id(), &as_commitment_signed.unwrap()).unwrap();
2694                                 assert!(bs_none.is_none());
2695                                 {
2696                                         let mut added_monitors = $node_b.chan_monitor.added_monitors.lock().unwrap();
2697                                         assert_eq!(added_monitors.len(), 1);
2698                                         added_monitors.clear();
2699                                 }
2700                                 if $fail_backwards {
2701                                         assert!($node_a.node.get_and_clear_pending_events().is_empty());
2702                                 }
2703                                 assert!($node_a.node.handle_revoke_and_ack(&$node_b.node.get_our_node_id(), &bs_revoke_and_ack).unwrap().is_none());
2704                                 {
2705                                         let mut added_monitors = $node_a.chan_monitor.added_monitors.lock().unwrap();
2706                                         if $fail_backwards {
2707                                                 assert_eq!(added_monitors.len(), 2);
2708                                                 assert!(added_monitors[0].0 != added_monitors[1].0);
2709                                         } else {
2710                                                 assert_eq!(added_monitors.len(), 1);
2711                                         }
2712                                         added_monitors.clear();
2713                                 }
2714                         }
2715                 }
2716         }
2717
2718         fn send_along_route(origin_node: &Node, route: Route, expected_route: &[&Node], recv_value: u64) -> ([u8; 32], [u8; 32]) {
2719                 let our_payment_preimage = [*origin_node.network_payment_count.borrow(); 32];
2720                 *origin_node.network_payment_count.borrow_mut() += 1;
2721                 let our_payment_hash = {
2722                         let mut sha = Sha256::new();
2723                         sha.input(&our_payment_preimage[..]);
2724                         let mut ret = [0; 32];
2725                         sha.result(&mut ret);
2726                         ret
2727                 };
2728
2729                 let mut payment_event = {
2730                         origin_node.node.send_payment(route, our_payment_hash).unwrap();
2731                         {
2732                                 let mut added_monitors = origin_node.chan_monitor.added_monitors.lock().unwrap();
2733                                 assert_eq!(added_monitors.len(), 1);
2734                                 added_monitors.clear();
2735                         }
2736
2737                         let mut events = origin_node.node.get_and_clear_pending_events();
2738                         assert_eq!(events.len(), 1);
2739                         SendEvent::from_event(events.remove(0))
2740                 };
2741                 let mut prev_node = origin_node;
2742
2743                 for (idx, &node) in expected_route.iter().enumerate() {
2744                         assert_eq!(node.node.get_our_node_id(), payment_event.node_id);
2745
2746                         node.node.handle_update_add_htlc(&prev_node.node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
2747                         {
2748                                 let added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2749                                 assert_eq!(added_monitors.len(), 0);
2750                         }
2751
2752                         commitment_signed_dance!(node, prev_node, payment_event.commitment_msg, false);
2753
2754                         let events_1 = node.node.get_and_clear_pending_events();
2755                         assert_eq!(events_1.len(), 1);
2756                         match events_1[0] {
2757                                 Event::PendingHTLCsForwardable { .. } => { },
2758                                 _ => panic!("Unexpected event"),
2759                         };
2760
2761                         node.node.channel_state.lock().unwrap().next_forward = Instant::now();
2762                         node.node.process_pending_htlc_forwards();
2763
2764                         let mut events_2 = node.node.get_and_clear_pending_events();
2765                         assert_eq!(events_2.len(), 1);
2766                         if idx == expected_route.len() - 1 {
2767                                 match events_2[0] {
2768                                         Event::PaymentReceived { ref payment_hash, amt } => {
2769                                                 assert_eq!(our_payment_hash, *payment_hash);
2770                                                 assert_eq!(amt, recv_value);
2771                                         },
2772                                         _ => panic!("Unexpected event"),
2773                                 }
2774                         } else {
2775                                 {
2776                                         let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2777                                         assert_eq!(added_monitors.len(), 1);
2778                                         added_monitors.clear();
2779                                 }
2780                                 payment_event = SendEvent::from_event(events_2.remove(0));
2781                                 assert_eq!(payment_event.msgs.len(), 1);
2782                         }
2783
2784                         prev_node = node;
2785                 }
2786
2787                 (our_payment_preimage, our_payment_hash)
2788         }
2789
2790         fn claim_payment_along_route(origin_node: &Node, expected_route: &[&Node], skip_last: bool, our_payment_preimage: [u8; 32]) {
2791                 assert!(expected_route.last().unwrap().node.claim_funds(our_payment_preimage));
2792                 {
2793                         let mut added_monitors = expected_route.last().unwrap().chan_monitor.added_monitors.lock().unwrap();
2794                         assert_eq!(added_monitors.len(), 1);
2795                         added_monitors.clear();
2796                 }
2797
2798                 let mut next_msgs: Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned)> = None;
2799                 macro_rules! update_fulfill_dance {
2800                         ($node: expr, $prev_node: expr, $last_node: expr) => {
2801                                 {
2802                                         $node.node.handle_update_fulfill_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
2803                                         {
2804                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2805                                                 if $last_node {
2806                                                         assert_eq!(added_monitors.len(), 0);
2807                                                 } else {
2808                                                         assert_eq!(added_monitors.len(), 1);
2809                                                 }
2810                                                 added_monitors.clear();
2811                                         }
2812                                         commitment_signed_dance!($node, $prev_node, next_msgs.as_ref().unwrap().1, false);
2813                                 }
2814                         }
2815                 }
2816
2817                 let mut expected_next_node = expected_route.last().unwrap().node.get_our_node_id();
2818                 let mut prev_node = expected_route.last().unwrap();
2819                 for (idx, node) in expected_route.iter().rev().enumerate() {
2820                         assert_eq!(expected_next_node, node.node.get_our_node_id());
2821                         if next_msgs.is_some() {
2822                                 update_fulfill_dance!(node, prev_node, false);
2823                         }
2824
2825                         let events = node.node.get_and_clear_pending_events();
2826                         if !skip_last || idx != expected_route.len() - 1 {
2827                                 assert_eq!(events.len(), 1);
2828                                 match events[0] {
2829                                         Event::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, ref commitment_signed } } => {
2830                                                 assert!(update_add_htlcs.is_empty());
2831                                                 assert_eq!(update_fulfill_htlcs.len(), 1);
2832                                                 assert!(update_fail_htlcs.is_empty());
2833                                                 assert!(update_fail_malformed_htlcs.is_empty());
2834                                                 expected_next_node = node_id.clone();
2835                                                 next_msgs = Some((update_fulfill_htlcs[0].clone(), commitment_signed.clone()));
2836                                         },
2837                                         _ => panic!("Unexpected event"),
2838                                 }
2839                         } else {
2840                                 assert!(events.is_empty());
2841                         }
2842                         if !skip_last && idx == expected_route.len() - 1 {
2843                                 assert_eq!(expected_next_node, origin_node.node.get_our_node_id());
2844                         }
2845
2846                         prev_node = node;
2847                 }
2848
2849                 if !skip_last {
2850                         update_fulfill_dance!(origin_node, expected_route.first().unwrap(), true);
2851                         let events = origin_node.node.get_and_clear_pending_events();
2852                         assert_eq!(events.len(), 1);
2853                         match events[0] {
2854                                 Event::PaymentSent { payment_preimage } => {
2855                                         assert_eq!(payment_preimage, our_payment_preimage);
2856                                 },
2857                                 _ => panic!("Unexpected event"),
2858                         }
2859                 }
2860         }
2861
2862         fn claim_payment(origin_node: &Node, expected_route: &[&Node], our_payment_preimage: [u8; 32]) {
2863                 claim_payment_along_route(origin_node, expected_route, false, our_payment_preimage);
2864         }
2865
2866         const TEST_FINAL_CLTV: u32 = 32;
2867
2868         fn route_payment(origin_node: &Node, expected_route: &[&Node], recv_value: u64) -> ([u8; 32], [u8; 32]) {
2869                 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();
2870                 assert_eq!(route.hops.len(), expected_route.len());
2871                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
2872                         assert_eq!(hop.pubkey, node.node.get_our_node_id());
2873                 }
2874
2875                 send_along_route(origin_node, route, expected_route, recv_value)
2876         }
2877
2878         fn route_over_limit(origin_node: &Node, expected_route: &[&Node], recv_value: u64) {
2879                 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();
2880                 assert_eq!(route.hops.len(), expected_route.len());
2881                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
2882                         assert_eq!(hop.pubkey, node.node.get_our_node_id());
2883                 }
2884
2885                 let our_payment_preimage = [*origin_node.network_payment_count.borrow(); 32];
2886                 *origin_node.network_payment_count.borrow_mut() += 1;
2887                 let our_payment_hash = {
2888                         let mut sha = Sha256::new();
2889                         sha.input(&our_payment_preimage[..]);
2890                         let mut ret = [0; 32];
2891                         sha.result(&mut ret);
2892                         ret
2893                 };
2894
2895                 let err = origin_node.node.send_payment(route, our_payment_hash).err().unwrap();
2896                 match err {
2897                         APIError::RouteError{err} => assert_eq!(err, "Cannot send value that would put us over our max HTLC value in flight"),
2898                         _ => panic!("Unknown error variants"),
2899                 };
2900         }
2901
2902         fn send_payment(origin: &Node, expected_route: &[&Node], recv_value: u64) {
2903                 let our_payment_preimage = route_payment(&origin, expected_route, recv_value).0;
2904                 claim_payment(&origin, expected_route, our_payment_preimage);
2905         }
2906
2907         fn fail_payment_along_route(origin_node: &Node, expected_route: &[&Node], skip_last: bool, our_payment_hash: [u8; 32]) {
2908                 assert!(expected_route.last().unwrap().node.fail_htlc_backwards(&our_payment_hash));
2909                 {
2910                         let mut added_monitors = expected_route.last().unwrap().chan_monitor.added_monitors.lock().unwrap();
2911                         assert_eq!(added_monitors.len(), 1);
2912                         added_monitors.clear();
2913                 }
2914
2915                 let mut next_msgs: Option<(msgs::UpdateFailHTLC, msgs::CommitmentSigned)> = None;
2916                 macro_rules! update_fail_dance {
2917                         ($node: expr, $prev_node: expr, $last_node: expr) => {
2918                                 {
2919                                         $node.node.handle_update_fail_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
2920                                         commitment_signed_dance!($node, $prev_node, next_msgs.as_ref().unwrap().1, !$last_node);
2921                                 }
2922                         }
2923                 }
2924
2925                 let mut expected_next_node = expected_route.last().unwrap().node.get_our_node_id();
2926                 let mut prev_node = expected_route.last().unwrap();
2927                 for (idx, node) in expected_route.iter().rev().enumerate() {
2928                         assert_eq!(expected_next_node, node.node.get_our_node_id());
2929                         if next_msgs.is_some() {
2930                                 // We may be the "last node" for the purpose of the commitment dance if we're
2931                                 // skipping the last node (implying it is disconnected) and we're the
2932                                 // second-to-last node!
2933                                 update_fail_dance!(node, prev_node, skip_last && idx == expected_route.len() - 1);
2934                         }
2935
2936                         let events = node.node.get_and_clear_pending_events();
2937                         if !skip_last || idx != expected_route.len() - 1 {
2938                                 assert_eq!(events.len(), 1);
2939                                 match events[0] {
2940                                         Event::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, ref commitment_signed } } => {
2941                                                 assert!(update_add_htlcs.is_empty());
2942                                                 assert!(update_fulfill_htlcs.is_empty());
2943                                                 assert_eq!(update_fail_htlcs.len(), 1);
2944                                                 assert!(update_fail_malformed_htlcs.is_empty());
2945                                                 expected_next_node = node_id.clone();
2946                                                 next_msgs = Some((update_fail_htlcs[0].clone(), commitment_signed.clone()));
2947                                         },
2948                                         _ => panic!("Unexpected event"),
2949                                 }
2950                         } else {
2951                                 assert!(events.is_empty());
2952                         }
2953                         if !skip_last && idx == expected_route.len() - 1 {
2954                                 assert_eq!(expected_next_node, origin_node.node.get_our_node_id());
2955                         }
2956
2957                         prev_node = node;
2958                 }
2959
2960                 if !skip_last {
2961                         update_fail_dance!(origin_node, expected_route.first().unwrap(), true);
2962
2963                         let events = origin_node.node.get_and_clear_pending_events();
2964                         assert_eq!(events.len(), 1);
2965                         match events[0] {
2966                                 Event::PaymentFailed { payment_hash } => {
2967                                         assert_eq!(payment_hash, our_payment_hash);
2968                                 },
2969                                 _ => panic!("Unexpected event"),
2970                         }
2971                 }
2972         }
2973
2974         fn fail_payment(origin_node: &Node, expected_route: &[&Node], our_payment_hash: [u8; 32]) {
2975                 fail_payment_along_route(origin_node, expected_route, false, our_payment_hash);
2976         }
2977
2978         fn create_network(node_count: usize) -> Vec<Node> {
2979                 let mut nodes = Vec::new();
2980                 let mut rng = thread_rng();
2981                 let secp_ctx = Secp256k1::new();
2982                 let logger: Arc<Logger> = Arc::new(test_utils::TestLogger::new());
2983
2984                 let chan_count = Rc::new(RefCell::new(0));
2985                 let payment_count = Rc::new(RefCell::new(0));
2986
2987                 for _ in 0..node_count {
2988                         let feeest = Arc::new(test_utils::TestFeeEstimator { sat_per_kw: 253 });
2989                         let chain_monitor = Arc::new(chaininterface::ChainWatchInterfaceUtil::new(Network::Testnet, Arc::clone(&logger)));
2990                         let tx_broadcaster = Arc::new(test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new())});
2991                         let chan_monitor = Arc::new(test_utils::TestChannelMonitor::new(chain_monitor.clone(), tx_broadcaster.clone()));
2992                         let node_id = {
2993                                 let mut key_slice = [0; 32];
2994                                 rng.fill_bytes(&mut key_slice);
2995                                 SecretKey::from_slice(&secp_ctx, &key_slice).unwrap()
2996                         };
2997                         let node = ChannelManager::new(node_id.clone(), 0, true, Network::Testnet, feeest.clone(), chan_monitor.clone(), chain_monitor.clone(), tx_broadcaster.clone(), Arc::clone(&logger)).unwrap();
2998                         let router = Router::new(PublicKey::from_secret_key(&secp_ctx, &node_id), chain_monitor.clone(), Arc::clone(&logger));
2999                         nodes.push(Node { chain_monitor, tx_broadcaster, chan_monitor, node, router,
3000                                 network_payment_count: payment_count.clone(),
3001                                 network_chan_count: chan_count.clone(),
3002                         });
3003                 }
3004
3005                 nodes
3006         }
3007
3008         #[test]
3009         fn fake_network_test() {
3010                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
3011                 // tests that payments get routed and transactions broadcast in semi-reasonable ways.
3012                 let nodes = create_network(4);
3013
3014                 // Create some initial channels
3015                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
3016                 let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2);
3017                 let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3);
3018
3019                 // Rebalance the network a bit by relaying one payment through all the channels...
3020                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
3021                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
3022                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
3023                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
3024
3025                 // Send some more payments
3026                 send_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 1000000);
3027                 send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1], &nodes[0])[..], 1000000);
3028                 send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1])[..], 1000000);
3029
3030                 // Test failure packets
3031                 let payment_hash_1 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 1000000).1;
3032                 fail_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], payment_hash_1);
3033
3034                 // Add a new channel that skips 3
3035                 let chan_4 = create_announced_chan_between_nodes(&nodes, 1, 3);
3036
3037                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 1000000);
3038                 send_payment(&nodes[2], &vec!(&nodes[3])[..], 1000000);
3039                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
3040                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
3041                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
3042                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
3043                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
3044
3045                 // Do some rebalance loop payments, simultaneously
3046                 let mut hops = Vec::with_capacity(3);
3047                 hops.push(RouteHop {
3048                         pubkey: nodes[2].node.get_our_node_id(),
3049                         short_channel_id: chan_2.0.contents.short_channel_id,
3050                         fee_msat: 0,
3051                         cltv_expiry_delta: chan_3.0.contents.cltv_expiry_delta as u32
3052                 });
3053                 hops.push(RouteHop {
3054                         pubkey: nodes[3].node.get_our_node_id(),
3055                         short_channel_id: chan_3.0.contents.short_channel_id,
3056                         fee_msat: 0,
3057                         cltv_expiry_delta: chan_4.1.contents.cltv_expiry_delta as u32
3058                 });
3059                 hops.push(RouteHop {
3060                         pubkey: nodes[1].node.get_our_node_id(),
3061                         short_channel_id: chan_4.0.contents.short_channel_id,
3062                         fee_msat: 1000000,
3063                         cltv_expiry_delta: TEST_FINAL_CLTV,
3064                 });
3065                 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;
3066                 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;
3067                 let payment_preimage_1 = send_along_route(&nodes[1], Route { hops }, &vec!(&nodes[2], &nodes[3], &nodes[1])[..], 1000000).0;
3068
3069                 let mut hops = Vec::with_capacity(3);
3070                 hops.push(RouteHop {
3071                         pubkey: nodes[3].node.get_our_node_id(),
3072                         short_channel_id: chan_4.0.contents.short_channel_id,
3073                         fee_msat: 0,
3074                         cltv_expiry_delta: chan_3.1.contents.cltv_expiry_delta as u32
3075                 });
3076                 hops.push(RouteHop {
3077                         pubkey: nodes[2].node.get_our_node_id(),
3078                         short_channel_id: chan_3.0.contents.short_channel_id,
3079                         fee_msat: 0,
3080                         cltv_expiry_delta: chan_2.1.contents.cltv_expiry_delta as u32
3081                 });
3082                 hops.push(RouteHop {
3083                         pubkey: nodes[1].node.get_our_node_id(),
3084                         short_channel_id: chan_2.0.contents.short_channel_id,
3085                         fee_msat: 1000000,
3086                         cltv_expiry_delta: TEST_FINAL_CLTV,
3087                 });
3088                 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;
3089                 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;
3090                 let payment_hash_2 = send_along_route(&nodes[1], Route { hops }, &vec!(&nodes[3], &nodes[2], &nodes[1])[..], 1000000).1;
3091
3092                 // Claim the rebalances...
3093                 fail_payment(&nodes[1], &vec!(&nodes[3], &nodes[2], &nodes[1])[..], payment_hash_2);
3094                 claim_payment(&nodes[1], &vec!(&nodes[2], &nodes[3], &nodes[1])[..], payment_preimage_1);
3095
3096                 // Add a duplicate new channel from 2 to 4
3097                 let chan_5 = create_announced_chan_between_nodes(&nodes, 1, 3);
3098
3099                 // Send some payments across both channels
3100                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
3101                 let payment_preimage_4 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
3102                 let payment_preimage_5 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
3103
3104                 route_over_limit(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000);
3105
3106                 //TODO: Test that routes work again here as we've been notified that the channel is full
3107
3108                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_3);
3109                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_4);
3110                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_5);
3111
3112                 // Close down the channels...
3113                 close_channel(&nodes[0], &nodes[1], &chan_1.2, chan_1.3, true);
3114                 close_channel(&nodes[1], &nodes[2], &chan_2.2, chan_2.3, false);
3115                 close_channel(&nodes[2], &nodes[3], &chan_3.2, chan_3.3, true);
3116                 close_channel(&nodes[1], &nodes[3], &chan_4.2, chan_4.3, false);
3117                 close_channel(&nodes[1], &nodes[3], &chan_5.2, chan_5.3, false);
3118         }
3119
3120         #[test]
3121         fn duplicate_htlc_test() {
3122                 // Test that we accept duplicate payment_hash HTLCs across the network and that
3123                 // claiming/failing them are all separate and don't effect each other
3124                 let mut nodes = create_network(6);
3125
3126                 // Create some initial channels to route via 3 to 4/5 from 0/1/2
3127                 create_announced_chan_between_nodes(&nodes, 0, 3);
3128                 create_announced_chan_between_nodes(&nodes, 1, 3);
3129                 create_announced_chan_between_nodes(&nodes, 2, 3);
3130                 create_announced_chan_between_nodes(&nodes, 3, 4);
3131                 create_announced_chan_between_nodes(&nodes, 3, 5);
3132
3133                 let (payment_preimage, payment_hash) = route_payment(&nodes[0], &vec!(&nodes[3], &nodes[4])[..], 1000000);
3134
3135                 *nodes[0].network_payment_count.borrow_mut() -= 1;
3136                 assert_eq!(route_payment(&nodes[1], &vec!(&nodes[3])[..], 1000000).0, payment_preimage);
3137
3138                 *nodes[0].network_payment_count.borrow_mut() -= 1;
3139                 assert_eq!(route_payment(&nodes[2], &vec!(&nodes[3], &nodes[5])[..], 1000000).0, payment_preimage);
3140
3141                 claim_payment(&nodes[0], &vec!(&nodes[3], &nodes[4])[..], payment_preimage);
3142                 fail_payment(&nodes[2], &vec!(&nodes[3], &nodes[5])[..], payment_hash);
3143                 claim_payment(&nodes[1], &vec!(&nodes[3])[..], payment_preimage);
3144         }
3145
3146         #[derive(PartialEq)]
3147         enum HTLCType { NONE, TIMEOUT, SUCCESS }
3148         /// Tests that the given node has broadcast transactions for the given Channel
3149         ///
3150         /// First checks that the latest local commitment tx has been broadcast, unless an explicit
3151         /// commitment_tx is provided, which may be used to test that a remote commitment tx was
3152         /// broadcast and the revoked outputs were claimed.
3153         ///
3154         /// Next tests that there is (or is not) a transaction that spends the commitment transaction
3155         /// that appears to be the type of HTLC transaction specified in has_htlc_tx.
3156         ///
3157         /// All broadcast transactions must be accounted for in one of the above three types of we'll
3158         /// also fail.
3159         fn test_txn_broadcast(node: &Node, chan: &(msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction), commitment_tx: Option<Transaction>, has_htlc_tx: HTLCType) -> Vec<Transaction> {
3160                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
3161                 assert!(node_txn.len() >= if commitment_tx.is_some() { 0 } else { 1 } + if has_htlc_tx == HTLCType::NONE { 0 } else { 1 });
3162
3163                 let mut res = Vec::with_capacity(2);
3164                 node_txn.retain(|tx| {
3165                         if tx.input.len() == 1 && tx.input[0].previous_output.txid == chan.3.txid() {
3166                                 let mut funding_tx_map = HashMap::new();
3167                                 funding_tx_map.insert(chan.3.txid(), chan.3.clone());
3168                                 tx.verify(&funding_tx_map).unwrap();
3169                                 if commitment_tx.is_none() {
3170                                         res.push(tx.clone());
3171                                 }
3172                                 false
3173                         } else { true }
3174                 });
3175                 if let Some(explicit_tx) = commitment_tx {
3176                         res.push(explicit_tx.clone());
3177                 }
3178
3179                 assert_eq!(res.len(), 1);
3180
3181                 if has_htlc_tx != HTLCType::NONE {
3182                         node_txn.retain(|tx| {
3183                                 if tx.input.len() == 1 && tx.input[0].previous_output.txid == res[0].txid() {
3184                                         let mut funding_tx_map = HashMap::new();
3185                                         funding_tx_map.insert(res[0].txid(), res[0].clone());
3186                                         tx.verify(&funding_tx_map).unwrap();
3187                                         if has_htlc_tx == HTLCType::TIMEOUT {
3188                                                 assert!(tx.lock_time != 0);
3189                                         } else {
3190                                                 assert!(tx.lock_time == 0);
3191                                         }
3192                                         res.push(tx.clone());
3193                                         false
3194                                 } else { true }
3195                         });
3196                         assert_eq!(res.len(), 2);
3197                 }
3198
3199                 assert!(node_txn.is_empty());
3200                 res
3201         }
3202
3203         /// Tests that the given node has broadcast a claim transaction against the provided revoked
3204         /// HTLC transaction.
3205         fn test_revoked_htlc_claim_txn_broadcast(node: &Node, revoked_tx: Transaction) {
3206                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
3207                 assert_eq!(node_txn.len(), 1);
3208                 node_txn.retain(|tx| {
3209                         if tx.input.len() == 1 && tx.input[0].previous_output.txid == revoked_tx.txid() {
3210                                 let mut funding_tx_map = HashMap::new();
3211                                 funding_tx_map.insert(revoked_tx.txid(), revoked_tx.clone());
3212                                 tx.verify(&funding_tx_map).unwrap();
3213                                 false
3214                         } else { true }
3215                 });
3216                 assert!(node_txn.is_empty());
3217         }
3218
3219         fn check_preimage_claim(node: &Node, prev_txn: &Vec<Transaction>) -> Vec<Transaction> {
3220                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
3221
3222                 assert!(node_txn.len() >= 1);
3223                 assert_eq!(node_txn[0].input.len(), 1);
3224                 let mut found_prev = false;
3225
3226                 for tx in prev_txn {
3227                         if node_txn[0].input[0].previous_output.txid == tx.txid() {
3228                                 let mut funding_tx_map = HashMap::new();
3229                                 funding_tx_map.insert(tx.txid(), tx.clone());
3230                                 node_txn[0].verify(&funding_tx_map).unwrap();
3231
3232                                 assert!(node_txn[0].input[0].witness[2].len() > 106); // must spend an htlc output
3233                                 assert_eq!(tx.input.len(), 1); // must spend a commitment tx
3234
3235                                 found_prev = true;
3236                                 break;
3237                         }
3238                 }
3239                 assert!(found_prev);
3240
3241                 let mut res = Vec::new();
3242                 mem::swap(&mut *node_txn, &mut res);
3243                 res
3244         }
3245
3246         fn get_announce_close_broadcast_events(nodes: &Vec<Node>, a: usize, b: usize) {
3247                 let events_1 = nodes[a].node.get_and_clear_pending_events();
3248                 assert_eq!(events_1.len(), 1);
3249                 let as_update = match events_1[0] {
3250                         Event::BroadcastChannelUpdate { ref msg } => {
3251                                 msg.clone()
3252                         },
3253                         _ => panic!("Unexpected event"),
3254                 };
3255
3256                 let events_2 = nodes[b].node.get_and_clear_pending_events();
3257                 assert_eq!(events_2.len(), 1);
3258                 let bs_update = match events_2[0] {
3259                         Event::BroadcastChannelUpdate { ref msg } => {
3260                                 msg.clone()
3261                         },
3262                         _ => panic!("Unexpected event"),
3263                 };
3264
3265                 for node in nodes {
3266                         node.router.handle_channel_update(&as_update).unwrap();
3267                         node.router.handle_channel_update(&bs_update).unwrap();
3268                 }
3269         }
3270
3271         #[test]
3272         fn channel_monitor_network_test() {
3273                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
3274                 // tests that ChannelMonitor is able to recover from various states.
3275                 let nodes = create_network(5);
3276
3277                 // Create some initial channels
3278                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
3279                 let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2);
3280                 let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3);
3281                 let chan_4 = create_announced_chan_between_nodes(&nodes, 3, 4);
3282
3283                 // Rebalance the network a bit by relaying one payment through all the channels...
3284                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
3285                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
3286                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
3287                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
3288
3289                 // Simple case with no pending HTLCs:
3290                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), true);
3291                 {
3292                         let mut node_txn = test_txn_broadcast(&nodes[1], &chan_1, None, HTLCType::NONE);
3293                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3294                         nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn.drain(..).next().unwrap()] }, 1);
3295                         test_txn_broadcast(&nodes[0], &chan_1, None, HTLCType::NONE);
3296                 }
3297                 get_announce_close_broadcast_events(&nodes, 0, 1);
3298                 assert_eq!(nodes[0].node.list_channels().len(), 0);
3299                 assert_eq!(nodes[1].node.list_channels().len(), 1);
3300
3301                 // One pending HTLC is discarded by the force-close:
3302                 let payment_preimage_1 = route_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 3000000).0;
3303
3304                 // Simple case of one pending HTLC to HTLC-Timeout
3305                 nodes[1].node.peer_disconnected(&nodes[2].node.get_our_node_id(), true);
3306                 {
3307                         let mut node_txn = test_txn_broadcast(&nodes[1], &chan_2, None, HTLCType::TIMEOUT);
3308                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3309                         nodes[2].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn.drain(..).next().unwrap()] }, 1);
3310                         test_txn_broadcast(&nodes[2], &chan_2, None, HTLCType::NONE);
3311                 }
3312                 get_announce_close_broadcast_events(&nodes, 1, 2);
3313                 assert_eq!(nodes[1].node.list_channels().len(), 0);
3314                 assert_eq!(nodes[2].node.list_channels().len(), 1);
3315
3316                 macro_rules! claim_funds {
3317                         ($node: expr, $prev_node: expr, $preimage: expr) => {
3318                                 {
3319                                         assert!($node.node.claim_funds($preimage));
3320                                         {
3321                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
3322                                                 assert_eq!(added_monitors.len(), 1);
3323                                                 added_monitors.clear();
3324                                         }
3325
3326                                         let events = $node.node.get_and_clear_pending_events();
3327                                         assert_eq!(events.len(), 1);
3328                                         match events[0] {
3329                                                 Event::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fail_htlcs, .. } } => {
3330                                                         assert!(update_add_htlcs.is_empty());
3331                                                         assert!(update_fail_htlcs.is_empty());
3332                                                         assert_eq!(*node_id, $prev_node.node.get_our_node_id());
3333                                                 },
3334                                                 _ => panic!("Unexpected event"),
3335                                         };
3336                                 }
3337                         }
3338                 }
3339
3340                 // nodes[3] gets the preimage, but nodes[2] already disconnected, resulting in a nodes[2]
3341                 // HTLC-Timeout and a nodes[3] claim against it (+ its own announces)
3342                 nodes[2].node.peer_disconnected(&nodes[3].node.get_our_node_id(), true);
3343                 {
3344                         let node_txn = test_txn_broadcast(&nodes[2], &chan_3, None, HTLCType::TIMEOUT);
3345
3346                         // Claim the payment on nodes[3], giving it knowledge of the preimage
3347                         claim_funds!(nodes[3], nodes[2], payment_preimage_1);
3348
3349                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3350                         nodes[3].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[0].clone()] }, 1);
3351
3352                         check_preimage_claim(&nodes[3], &node_txn);
3353                 }
3354                 get_announce_close_broadcast_events(&nodes, 2, 3);
3355                 assert_eq!(nodes[2].node.list_channels().len(), 0);
3356                 assert_eq!(nodes[3].node.list_channels().len(), 1);
3357
3358                 // One pending HTLC to time out:
3359                 let payment_preimage_2 = route_payment(&nodes[3], &vec!(&nodes[4])[..], 3000000).0;
3360
3361                 {
3362                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3363                         nodes[3].chain_monitor.block_connected_checked(&header, 1, &Vec::new()[..], &[0; 0]);
3364                         for i in 2..TEST_FINAL_CLTV - 3 {
3365                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3366                                 nodes[3].chain_monitor.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
3367                         }
3368
3369                         let node_txn = test_txn_broadcast(&nodes[3], &chan_4, None, HTLCType::TIMEOUT);
3370
3371                         // Claim the payment on nodes[4], giving it knowledge of the preimage
3372                         claim_funds!(nodes[4], nodes[3], payment_preimage_2);
3373
3374                         header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3375                         nodes[4].chain_monitor.block_connected_checked(&header, 1, &Vec::new()[..], &[0; 0]);
3376                         for i in 2..TEST_FINAL_CLTV - 3 {
3377                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3378                                 nodes[4].chain_monitor.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
3379                         }
3380
3381                         test_txn_broadcast(&nodes[4], &chan_4, None, HTLCType::SUCCESS);
3382
3383                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3384                         nodes[4].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[0].clone()] }, TEST_FINAL_CLTV - 5);
3385
3386                         check_preimage_claim(&nodes[4], &node_txn);
3387                 }
3388                 get_announce_close_broadcast_events(&nodes, 3, 4);
3389                 assert_eq!(nodes[3].node.list_channels().len(), 0);
3390                 assert_eq!(nodes[4].node.list_channels().len(), 0);
3391
3392                 // Create some new channels:
3393                 let chan_5 = create_announced_chan_between_nodes(&nodes, 0, 1);
3394
3395                 // A pending HTLC which will be revoked:
3396                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
3397                 // Get the will-be-revoked local txn from nodes[0]
3398                 let revoked_local_txn = nodes[0].node.channel_state.lock().unwrap().by_id.iter().next().unwrap().1.last_local_commitment_txn.clone();
3399                 // Revoke the old state
3400                 claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage_3);
3401
3402                 {
3403                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3404                         nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
3405                         {
3406                                 let mut node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
3407                                 assert_eq!(node_txn.len(), 3);
3408                                 assert_eq!(node_txn.pop().unwrap(), node_txn[0]); // An outpoint registration will result in a 2nd block_connected
3409                                 assert_eq!(node_txn[0].input.len(), 1);
3410
3411                                 let mut funding_tx_map = HashMap::new();
3412                                 funding_tx_map.insert(revoked_local_txn[0].txid(), revoked_local_txn[0].clone());
3413                                 node_txn[0].verify(&funding_tx_map).unwrap();
3414                                 node_txn.swap_remove(0);
3415                         }
3416                         test_txn_broadcast(&nodes[1], &chan_5, None, HTLCType::NONE);
3417
3418                         nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
3419                         let node_txn = test_txn_broadcast(&nodes[0], &chan_5, Some(revoked_local_txn[0].clone()), HTLCType::TIMEOUT);
3420                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3421                         nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[1].clone()] }, 1);
3422                         test_revoked_htlc_claim_txn_broadcast(&nodes[1], node_txn[1].clone());
3423                 }
3424                 get_announce_close_broadcast_events(&nodes, 0, 1);
3425                 assert_eq!(nodes[0].node.list_channels().len(), 0);
3426                 assert_eq!(nodes[1].node.list_channels().len(), 0);
3427         }
3428
3429         #[test]
3430         fn test_htlc_ignore_latest_remote_commitment() {
3431                 // Test that HTLC transactions spending the latest remote commitment transaction are simply
3432                 // ignored if we cannot claim them. This originally tickled an invalid unwrap().
3433                 let nodes = create_network(2);
3434                 create_announced_chan_between_nodes(&nodes, 0, 1);
3435
3436                 route_payment(&nodes[0], &[&nodes[1]], 10000000);
3437                 nodes[0].node.force_close_channel(&nodes[0].node.list_channels()[0].channel_id);
3438                 {
3439                         let events = nodes[0].node.get_and_clear_pending_events();
3440                         assert_eq!(events.len(), 1);
3441                         match events[0] {
3442                                 Event::BroadcastChannelUpdate { msg: msgs::ChannelUpdate { contents: msgs::UnsignedChannelUpdate { flags, .. }, .. } } => {
3443                                         assert_eq!(flags & 0b10, 0b10);
3444                                 },
3445                                 _ => panic!("Unexpected event"),
3446                         }
3447                 }
3448
3449                 let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
3450                 assert_eq!(node_txn.len(), 2);
3451
3452                 let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3453                 nodes[1].chain_monitor.block_connected_checked(&header, 1, &[&node_txn[0], &node_txn[1]], &[1; 2]);
3454
3455                 {
3456                         let events = nodes[1].node.get_and_clear_pending_events();
3457                         assert_eq!(events.len(), 1);
3458                         match events[0] {
3459                                 Event::BroadcastChannelUpdate { msg: msgs::ChannelUpdate { contents: msgs::UnsignedChannelUpdate { flags, .. }, .. } } => {
3460                                         assert_eq!(flags & 0b10, 0b10);
3461                                 },
3462                                 _ => panic!("Unexpected event"),
3463                         }
3464                 }
3465
3466                 // Duplicate the block_connected call since this may happen due to other listeners
3467                 // registering new transactions
3468                 nodes[1].chain_monitor.block_connected_checked(&header, 1, &[&node_txn[0], &node_txn[1]], &[1; 2]);
3469         }
3470
3471         #[test]
3472         fn test_force_close_fail_back() {
3473                 // Check which HTLCs are failed-backwards on channel force-closure
3474                 let mut nodes = create_network(3);
3475                 create_announced_chan_between_nodes(&nodes, 0, 1);
3476                 create_announced_chan_between_nodes(&nodes, 1, 2);
3477
3478                 let route = nodes[0].router.get_route(&nodes[2].node.get_our_node_id(), None, &Vec::new(), 1000000, 42).unwrap();
3479
3480                 let our_payment_preimage = [*nodes[0].network_payment_count.borrow(); 32];
3481                 *nodes[0].network_payment_count.borrow_mut() += 1;
3482                 let our_payment_hash = {
3483                         let mut sha = Sha256::new();
3484                         sha.input(&our_payment_preimage[..]);
3485                         let mut ret = [0; 32];
3486                         sha.result(&mut ret);
3487                         ret
3488                 };
3489
3490                 let mut payment_event = {
3491                         nodes[0].node.send_payment(route, our_payment_hash).unwrap();
3492                         {
3493                                 let mut added_monitors = nodes[0].chan_monitor.added_monitors.lock().unwrap();
3494                                 assert_eq!(added_monitors.len(), 1);
3495                                 added_monitors.clear();
3496                         }
3497
3498                         let mut events = nodes[0].node.get_and_clear_pending_events();
3499                         assert_eq!(events.len(), 1);
3500                         SendEvent::from_event(events.remove(0))
3501                 };
3502
3503                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
3504                 commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
3505
3506                 let events_1 = nodes[1].node.get_and_clear_pending_events();
3507                 assert_eq!(events_1.len(), 1);
3508                 match events_1[0] {
3509                         Event::PendingHTLCsForwardable { .. } => { },
3510                         _ => panic!("Unexpected event"),
3511                 };
3512
3513                 nodes[1].node.channel_state.lock().unwrap().next_forward = Instant::now();
3514                 nodes[1].node.process_pending_htlc_forwards();
3515
3516                 let mut events_2 = nodes[1].node.get_and_clear_pending_events();
3517                 assert_eq!(events_2.len(), 1);
3518                 payment_event = SendEvent::from_event(events_2.remove(0));
3519                 assert_eq!(payment_event.msgs.len(), 1);
3520
3521                 {
3522                         let mut added_monitors = nodes[1].chan_monitor.added_monitors.lock().unwrap();
3523                         assert_eq!(added_monitors.len(), 1);
3524                         added_monitors.clear();
3525                 }
3526
3527                 nodes[2].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
3528                 nodes[2].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &payment_event.commitment_msg).unwrap();
3529
3530                 {
3531                         let mut added_monitors = nodes[2].chan_monitor.added_monitors.lock().unwrap();
3532                         assert_eq!(added_monitors.len(), 1);
3533                         added_monitors.clear();
3534                 }
3535
3536                 // nodes[2] now has the latest commitment transaction, but hasn't revoked its previous
3537                 // state or updated nodes[1]' state. Now force-close and broadcast that commitment/HTLC
3538                 // transaction and ensure nodes[1] doesn't fail-backwards (this was originally a bug!).
3539
3540                 nodes[2].node.force_close_channel(&payment_event.commitment_msg.channel_id);
3541                 let events_3 = nodes[2].node.get_and_clear_pending_events();
3542                 assert_eq!(events_3.len(), 1);
3543                 match events_3[0] {
3544                         Event::BroadcastChannelUpdate { msg: msgs::ChannelUpdate { contents: msgs::UnsignedChannelUpdate { flags, .. }, .. } } => {
3545                                 assert_eq!(flags & 0b10, 0b10);
3546                         },
3547                         _ => panic!("Unexpected event"),
3548                 }
3549
3550                 let tx = {
3551                         let mut node_txn = nodes[2].tx_broadcaster.txn_broadcasted.lock().unwrap();
3552                         // Note that we don't bother broadcasting the HTLC-Success transaction here as we don't
3553                         // have a use for it unless nodes[2] learns the preimage somehow, the funds will go
3554                         // back to nodes[1] upon timeout otherwise.
3555                         assert_eq!(node_txn.len(), 1);
3556                         node_txn.remove(0)
3557                 };
3558
3559                 let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3560                 nodes[1].chain_monitor.block_connected_checked(&header, 1, &[&tx], &[1]);
3561
3562                 let events_4 = nodes[1].node.get_and_clear_pending_events();
3563                 // Note no UpdateHTLCs event here from nodes[1] to nodes[0]!
3564                 assert_eq!(events_4.len(), 1);
3565                 match events_4[0] {
3566                         Event::BroadcastChannelUpdate { msg: msgs::ChannelUpdate { contents: msgs::UnsignedChannelUpdate { flags, .. }, .. } } => {
3567                                 assert_eq!(flags & 0b10, 0b10);
3568                         },
3569                         _ => panic!("Unexpected event"),
3570                 }
3571
3572                 // Now check that if we add the preimage to ChannelMonitor it broadcasts our HTLC-Success..
3573                 {
3574                         let mut monitors = nodes[2].chan_monitor.simple_monitor.monitors.lock().unwrap();
3575                         monitors.get_mut(&OutPoint::new(Sha256dHash::from(&payment_event.commitment_msg.channel_id[..]), 0)).unwrap()
3576                                 .provide_payment_preimage(&our_payment_hash, &our_payment_preimage);
3577                 }
3578                 nodes[2].chain_monitor.block_connected_checked(&header, 1, &[&tx], &[1]);
3579                 let node_txn = nodes[2].tx_broadcaster.txn_broadcasted.lock().unwrap();
3580                 assert_eq!(node_txn.len(), 1);
3581                 assert_eq!(node_txn[0].input.len(), 1);
3582                 assert_eq!(node_txn[0].input[0].previous_output.txid, tx.txid());
3583                 assert_eq!(node_txn[0].lock_time, 0); // Must be an HTLC-Success
3584                 assert_eq!(node_txn[0].input[0].witness.len(), 5); // Must be an HTLC-Success
3585                 let mut funding_tx_map = HashMap::new();
3586                 funding_tx_map.insert(tx.txid(), tx);
3587                 node_txn[0].verify(&funding_tx_map).unwrap();
3588         }
3589
3590         #[test]
3591         fn test_unconf_chan() {
3592                 // After creating a chan between nodes, we disconnect all blocks previously seen to force a channel close on nodes[0] side
3593                 let nodes = create_network(2);
3594                 create_announced_chan_between_nodes(&nodes, 0, 1);
3595
3596                 let channel_state = nodes[0].node.channel_state.lock().unwrap();
3597                 assert_eq!(channel_state.by_id.len(), 1);
3598                 assert_eq!(channel_state.short_to_id.len(), 1);
3599                 mem::drop(channel_state);
3600
3601                 let mut headers = Vec::new();
3602                 let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3603                 headers.push(header.clone());
3604                 for _i in 2..100 {
3605                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3606                         headers.push(header.clone());
3607                 }
3608                 while !headers.is_empty() {
3609                         nodes[0].node.block_disconnected(&headers.pop().unwrap());
3610                 }
3611                 {
3612                         let events = nodes[0].node.get_and_clear_pending_events();
3613                         assert_eq!(events.len(), 1);
3614                         match events[0] {
3615                                 Event::BroadcastChannelUpdate { msg: msgs::ChannelUpdate { contents: msgs::UnsignedChannelUpdate { flags, .. }, .. } } => {
3616                                         assert_eq!(flags & 0b10, 0b10);
3617                                 },
3618                                 _ => panic!("Unexpected event"),
3619                         }
3620                 }
3621                 let channel_state = nodes[0].node.channel_state.lock().unwrap();
3622                 assert_eq!(channel_state.by_id.len(), 0);
3623                 assert_eq!(channel_state.short_to_id.len(), 0);
3624         }
3625
3626         fn reconnect_nodes(node_a: &Node, node_b: &Node, pre_all_htlcs: bool, pending_htlc_claims: (usize, usize), pending_htlc_fails: (usize, usize)) {
3627                 let reestablish_1 = node_a.node.peer_connected(&node_b.node.get_our_node_id());
3628                 let reestablish_2 = node_b.node.peer_connected(&node_a.node.get_our_node_id());
3629
3630                 let mut resp_1 = Vec::new();
3631                 for msg in reestablish_1 {
3632                         resp_1.push(node_b.node.handle_channel_reestablish(&node_a.node.get_our_node_id(), &msg).unwrap());
3633                 }
3634                 {
3635                         let mut added_monitors = node_b.chan_monitor.added_monitors.lock().unwrap();
3636                         if pending_htlc_claims.0 != 0 || pending_htlc_fails.0 != 0 {
3637                                 assert_eq!(added_monitors.len(), 1);
3638                         } else {
3639                                 assert!(added_monitors.is_empty());
3640                         }
3641                         added_monitors.clear();
3642                 }
3643
3644                 let mut resp_2 = Vec::new();
3645                 for msg in reestablish_2 {
3646                         resp_2.push(node_a.node.handle_channel_reestablish(&node_b.node.get_our_node_id(), &msg).unwrap());
3647                 }
3648                 {
3649                         let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
3650                         if pending_htlc_claims.1 != 0 || pending_htlc_fails.1 != 0 {
3651                                 assert_eq!(added_monitors.len(), 1);
3652                         } else {
3653                                 assert!(added_monitors.is_empty());
3654                         }
3655                         added_monitors.clear();
3656                 }
3657
3658                 // We dont yet support both needing updates, as that would require a different commitment dance:
3659                 assert!((pending_htlc_claims.0 == 0 && pending_htlc_fails.0 == 0) || (pending_htlc_claims.1 == 0 && pending_htlc_fails.1 == 0));
3660
3661                 for chan_msgs in resp_1.drain(..) {
3662                         if pre_all_htlcs {
3663                                 let _announcement_sigs_opt = node_a.node.handle_funding_locked(&node_b.node.get_our_node_id(), &chan_msgs.0.unwrap()).unwrap();
3664                                 //TODO: Test announcement_sigs re-sending when we've implemented it
3665                         } else {
3666                                 assert!(chan_msgs.0.is_none());
3667                         }
3668                         assert!(chan_msgs.1.is_none());
3669                         if pending_htlc_claims.0 != 0 || pending_htlc_fails.0 != 0 {
3670                                 let commitment_update = chan_msgs.2.unwrap();
3671                                 assert!(commitment_update.update_add_htlcs.is_empty()); // We can't relay while disconnected
3672                                 assert_eq!(commitment_update.update_fulfill_htlcs.len(), pending_htlc_claims.0);
3673                                 assert_eq!(commitment_update.update_fail_htlcs.len(), pending_htlc_fails.0);
3674                                 assert!(commitment_update.update_fail_malformed_htlcs.is_empty());
3675                                 for update_fulfill in commitment_update.update_fulfill_htlcs {
3676                                         node_a.node.handle_update_fulfill_htlc(&node_b.node.get_our_node_id(), &update_fulfill).unwrap();
3677                                 }
3678                                 for update_fail in commitment_update.update_fail_htlcs {
3679                                         node_a.node.handle_update_fail_htlc(&node_b.node.get_our_node_id(), &update_fail).unwrap();
3680                                 }
3681
3682                                 commitment_signed_dance!(node_a, node_b, commitment_update.commitment_signed, false);
3683                         } else {
3684                                 assert!(chan_msgs.2.is_none());
3685                         }
3686                 }
3687
3688                 for chan_msgs in resp_2.drain(..) {
3689                         if pre_all_htlcs {
3690                                 let _announcement_sigs_opt = node_b.node.handle_funding_locked(&node_a.node.get_our_node_id(), &chan_msgs.0.unwrap()).unwrap();
3691                                 //TODO: Test announcement_sigs re-sending when we've implemented it
3692                         } else {
3693                                 assert!(chan_msgs.0.is_none());
3694                         }
3695                         assert!(chan_msgs.1.is_none());
3696                         if pending_htlc_claims.1 != 0 || pending_htlc_fails.1 != 0 {
3697                                 let commitment_update = chan_msgs.2.unwrap();
3698                                 assert!(commitment_update.update_add_htlcs.is_empty()); // We can't relay while disconnected
3699                                 assert_eq!(commitment_update.update_fulfill_htlcs.len(), pending_htlc_claims.0);
3700                                 assert_eq!(commitment_update.update_fail_htlcs.len(), pending_htlc_fails.0);
3701                                 assert!(commitment_update.update_fail_malformed_htlcs.is_empty());
3702                                 for update_fulfill in commitment_update.update_fulfill_htlcs {
3703                                         node_b.node.handle_update_fulfill_htlc(&node_a.node.get_our_node_id(), &update_fulfill).unwrap();
3704                                 }
3705                                 for update_fail in commitment_update.update_fail_htlcs {
3706                                         node_b.node.handle_update_fail_htlc(&node_a.node.get_our_node_id(), &update_fail).unwrap();
3707                                 }
3708
3709                                 commitment_signed_dance!(node_b, node_a, commitment_update.commitment_signed, false);
3710                         } else {
3711                                 assert!(chan_msgs.2.is_none());
3712                         }
3713                 }
3714         }
3715
3716         #[test]
3717         fn test_simple_peer_disconnect() {
3718                 // Test that we can reconnect when there are no lost messages
3719                 let nodes = create_network(3);
3720                 create_announced_chan_between_nodes(&nodes, 0, 1);
3721                 create_announced_chan_between_nodes(&nodes, 1, 2);
3722
3723                 nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
3724                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
3725                 reconnect_nodes(&nodes[0], &nodes[1], true, (0, 0), (0, 0));
3726
3727                 let payment_preimage_1 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).0;
3728                 let payment_hash_2 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).1;
3729                 fail_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), payment_hash_2);
3730                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), payment_preimage_1);
3731
3732                 nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
3733                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
3734                 reconnect_nodes(&nodes[0], &nodes[1], false, (0, 0), (0, 0));
3735
3736                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).0;
3737                 let payment_preimage_4 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).0;
3738                 let payment_hash_5 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).1;
3739                 let payment_hash_6 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).1;
3740
3741                 nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
3742                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
3743
3744                 claim_payment_along_route(&nodes[0], &vec!(&nodes[1], &nodes[2]), true, payment_preimage_3);
3745                 fail_payment_along_route(&nodes[0], &[&nodes[1], &nodes[2]], true, payment_hash_5);
3746
3747                 reconnect_nodes(&nodes[0], &nodes[1], false, (1, 0), (1, 0));
3748                 {
3749                         let events = nodes[0].node.get_and_clear_pending_events();
3750                         assert_eq!(events.len(), 2);
3751                         match events[0] {
3752                                 Event::PaymentSent { payment_preimage } => {
3753                                         assert_eq!(payment_preimage, payment_preimage_3);
3754                                 },
3755                                 _ => panic!("Unexpected event"),
3756                         }
3757                         match events[1] {
3758                                 Event::PaymentFailed { payment_hash } => {
3759                                         assert_eq!(payment_hash, payment_hash_5);
3760                                 },
3761                                 _ => panic!("Unexpected event"),
3762                         }
3763                 }
3764
3765                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), payment_preimage_4);
3766                 fail_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), payment_hash_6);
3767         }
3768
3769         #[test]
3770         fn test_invalid_channel_announcement() {
3771                 //Test BOLT 7 channel_announcement msg requirement for final node, gather data to build customed channel_announcement msgs
3772                 let secp_ctx = Secp256k1::new();
3773                 let nodes = create_network(2);
3774
3775                 let chan_announcement = create_chan_between_nodes(&nodes[0], &nodes[1]);
3776
3777                 let a_channel_lock = nodes[0].node.channel_state.lock().unwrap();
3778                 let b_channel_lock = nodes[1].node.channel_state.lock().unwrap();
3779                 let as_chan = a_channel_lock.by_id.get(&chan_announcement.3).unwrap();
3780                 let bs_chan = b_channel_lock.by_id.get(&chan_announcement.3).unwrap();
3781
3782                 let _ = nodes[0].router.handle_htlc_fail_channel_update(&msgs::HTLCFailChannelUpdate::ChannelClosed { short_channel_id : as_chan.get_short_channel_id().unwrap() } );
3783
3784                 let as_bitcoin_key = PublicKey::from_secret_key(&secp_ctx, &as_chan.get_local_keys().funding_key);
3785                 let bs_bitcoin_key = PublicKey::from_secret_key(&secp_ctx, &bs_chan.get_local_keys().funding_key);
3786
3787                 let as_network_key = nodes[0].node.get_our_node_id();
3788                 let bs_network_key = nodes[1].node.get_our_node_id();
3789
3790                 let were_node_one = as_bitcoin_key.serialize()[..] < bs_bitcoin_key.serialize()[..];
3791
3792                 let mut chan_announcement;
3793
3794                 macro_rules! dummy_unsigned_msg {
3795                         () => {
3796                                 msgs::UnsignedChannelAnnouncement {
3797                                         features: msgs::GlobalFeatures::new(),
3798                                         chain_hash: genesis_block(Network::Testnet).header.bitcoin_hash(),
3799                                         short_channel_id: as_chan.get_short_channel_id().unwrap(),
3800                                         node_id_1: if were_node_one { as_network_key } else { bs_network_key },
3801                                         node_id_2: if were_node_one { bs_network_key } else { as_network_key },
3802                                         bitcoin_key_1: if were_node_one { as_bitcoin_key } else { bs_bitcoin_key },
3803                                         bitcoin_key_2: if were_node_one { bs_bitcoin_key } else { as_bitcoin_key },
3804                                         excess_data: Vec::new(),
3805                                 };
3806                         }
3807                 }
3808
3809                 macro_rules! sign_msg {
3810                         ($unsigned_msg: expr) => {
3811                                 let msghash = Message::from_slice(&Sha256dHash::from_data(&$unsigned_msg.encode()[..])[..]).unwrap();
3812                                 let as_bitcoin_sig = secp_ctx.sign(&msghash, &as_chan.get_local_keys().funding_key);
3813                                 let bs_bitcoin_sig = secp_ctx.sign(&msghash, &bs_chan.get_local_keys().funding_key);
3814                                 let as_node_sig = secp_ctx.sign(&msghash, &nodes[0].node.our_network_key);
3815                                 let bs_node_sig = secp_ctx.sign(&msghash, &nodes[1].node.our_network_key);
3816                                 chan_announcement = msgs::ChannelAnnouncement {
3817                                         node_signature_1 : if were_node_one { as_node_sig } else { bs_node_sig},
3818                                         node_signature_2 : if were_node_one { bs_node_sig } else { as_node_sig},
3819                                         bitcoin_signature_1: if were_node_one { as_bitcoin_sig } else { bs_bitcoin_sig },
3820                                         bitcoin_signature_2 : if were_node_one { bs_bitcoin_sig } else { as_bitcoin_sig },
3821                                         contents: $unsigned_msg
3822                                 }
3823                         }
3824                 }
3825
3826                 let unsigned_msg = dummy_unsigned_msg!();
3827                 sign_msg!(unsigned_msg);
3828                 assert_eq!(nodes[0].router.handle_channel_announcement(&chan_announcement).unwrap(), true);
3829                 let _ = nodes[0].router.handle_htlc_fail_channel_update(&msgs::HTLCFailChannelUpdate::ChannelClosed { short_channel_id : as_chan.get_short_channel_id().unwrap() } );
3830
3831                 // Configured with Network::Testnet
3832                 let mut unsigned_msg = dummy_unsigned_msg!();
3833                 unsigned_msg.chain_hash = genesis_block(Network::Bitcoin).header.bitcoin_hash();
3834                 sign_msg!(unsigned_msg);
3835                 assert!(nodes[0].router.handle_channel_announcement(&chan_announcement).is_err());
3836
3837                 let mut unsigned_msg = dummy_unsigned_msg!();
3838                 unsigned_msg.chain_hash = Sha256dHash::from_data(&[1,2,3,4,5,6,7,8,9]);
3839                 sign_msg!(unsigned_msg);
3840                 assert!(nodes[0].router.handle_channel_announcement(&chan_announcement).is_err());
3841         }
3842 }