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

   1 // This file is Copyright its original authors, visible in version control
   2 // history.
   3 //
   4 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
   5 // or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
   7 // You may not use this file except in accordance with one or both of these
   8 // licenses.
   9
  10 //! Top level peer message handling and socket handling logic lives here.
  11 //!
  12 //! Instead of actually servicing sockets ourselves we require that you implement the
  13 //! SocketDescriptor interface and use that to receive actions which you should perform on the
  14 //! socket, and call into PeerManager with bytes read from the socket. The PeerManager will then
  15 //! call into the provided message handlers (probably a ChannelManager and NetGraphmsgHandler) with messages
  16 //! they should handle, and encoding/sending response messages.
  17
  18 use bitcoin::secp256k1::key::{SecretKey,PublicKey};
  19
  20 use ln::features::InitFeatures;
  21 use ln::msgs;
  22 use ln::msgs::{ChannelMessageHandler, LightningError, RoutingMessageHandler};
  23 use ln::channelmanager::{SimpleArcChannelManager, SimpleRefChannelManager};
  24 use util::ser::{VecWriter, Writeable};
  25 use ln::peer_channel_encryptor::{PeerChannelEncryptor,NextNoiseStep};
  26 use ln::wire;
  27 use ln::wire::Encode;
  28 use util::byte_utils;
  29 use util::events::{MessageSendEvent, MessageSendEventsProvider};
  30 use util::logger::Logger;
  31 use routing::network_graph::NetGraphMsgHandler;
  32
  33 use std::collections::{HashMap,hash_map,HashSet,LinkedList};
  34 use std::sync::{Arc, Mutex};
  35 use std::sync::atomic::{AtomicUsize, Ordering};
  36 use std::{cmp, error, hash, fmt, mem};
  37 use std::ops::Deref;
  38
  39 use bitcoin::hashes::sha256::Hash as Sha256;
  40 use bitcoin::hashes::sha256::HashEngine as Sha256Engine;
  41 use bitcoin::hashes::{HashEngine, Hash};
  42
  43 /// A dummy struct which implements `RoutingMessageHandler` without storing any routing information
  44 /// or doing any processing. You can provide one of these as the route_handler in a MessageHandler.
  45 struct IgnoringMessageHandler{}
  46 impl MessageSendEventsProvider for IgnoringMessageHandler {
  47         fn get_and_clear_pending_msg_events(&self) -> Vec<MessageSendEvent> { Vec::new() }
  48 }
  49 impl RoutingMessageHandler for IgnoringMessageHandler {
  50         fn handle_node_announcement(&self, _msg: &msgs::NodeAnnouncement) -> Result<bool, LightningError> { Ok(false) }
  51         fn handle_channel_announcement(&self, _msg: &msgs::ChannelAnnouncement) -> Result<bool, LightningError> { Ok(false) }
  52         fn handle_channel_update(&self, _msg: &msgs::ChannelUpdate) -> Result<bool, LightningError> { Ok(false) }
  53         fn handle_htlc_fail_channel_update(&self, _update: &msgs::HTLCFailChannelUpdate) {}
  54         fn get_next_channel_announcements(&self, _starting_point: u64, _batch_amount: u8) ->
  55                 Vec<(msgs::ChannelAnnouncement, Option<msgs::ChannelUpdate>, Option<msgs::ChannelUpdate>)> { Vec::new() }
  56         fn get_next_node_announcements(&self, _starting_point: Option<&PublicKey>, _batch_amount: u8) -> Vec<msgs::NodeAnnouncement> { Vec::new() }
  57         fn sync_routing_table(&self, _their_node_id: &PublicKey, _init: &msgs::Init) {}
  58         fn handle_reply_channel_range(&self, _their_node_id: &PublicKey, _msg: msgs::ReplyChannelRange) -> Result<(), LightningError> { Ok(()) }
  59         fn handle_reply_short_channel_ids_end(&self, _their_node_id: &PublicKey, _msg: msgs::ReplyShortChannelIdsEnd) -> Result<(), LightningError> { Ok(()) }
  60         fn handle_query_channel_range(&self, _their_node_id: &PublicKey, _msg: msgs::QueryChannelRange) -> Result<(), LightningError> { Ok(()) }
  61         fn handle_query_short_channel_ids(&self, _their_node_id: &PublicKey, _msg: msgs::QueryShortChannelIds) -> Result<(), LightningError> { Ok(()) }
  62 }
  63 impl Deref for IgnoringMessageHandler {
  64         type Target = IgnoringMessageHandler;
  65         fn deref(&self) -> &Self { self }
  66 }
  67
  68 /// A dummy struct which implements `ChannelMessageHandler` without having any channels.
  69 /// You can provide one of these as the route_handler in a MessageHandler.
  70 struct ErroringMessageHandler {
  71         message_queue: Mutex<Vec<MessageSendEvent>>
  72 }
  73 impl ErroringMessageHandler {
  74         /// Constructs a new ErroringMessageHandler
  75         pub fn new() -> Self {
  76                 Self { message_queue: Mutex::new(Vec::new()) }
  77         }
  78         fn push_error(&self, node_id: &PublicKey, channel_id: [u8; 32]) {
  79                 self.message_queue.lock().unwrap().push(MessageSendEvent::HandleError {
  80                         action: msgs::ErrorAction::SendErrorMessage {
  81                                 msg: msgs::ErrorMessage { channel_id, data: "We do not support channel messages, sorry.".to_owned() },
  82                         },
  83                         node_id: node_id.clone(),
  84                 });
  85         }
  86 }
  87 impl MessageSendEventsProvider for ErroringMessageHandler {
  88         fn get_and_clear_pending_msg_events(&self) -> Vec<MessageSendEvent> {
  89                 let mut res = Vec::new();
  90                 mem::swap(&mut res, &mut self.message_queue.lock().unwrap());
  91                 res
  92         }
  93 }
  94 impl ChannelMessageHandler for ErroringMessageHandler {
  95         // Any messages which are related to a specific channel generate an error message to let the
  96         // peer know we don't care about channels.
  97         fn handle_open_channel(&self, their_node_id: &PublicKey, _their_features: InitFeatures, msg: &msgs::OpenChannel) {
  98                 ErroringMessageHandler::push_error(self, their_node_id, msg.temporary_channel_id);
  99         }
 100         fn handle_accept_channel(&self, their_node_id: &PublicKey, _their_features: InitFeatures, msg: &msgs::AcceptChannel) {
 101                 ErroringMessageHandler::push_error(self, their_node_id, msg.temporary_channel_id);
 102         }
 103         fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) {
 104                 ErroringMessageHandler::push_error(self, their_node_id, msg.temporary_channel_id);
 105         }
 106         fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) {
 107                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 108         }
 109         fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &msgs::FundingLocked) {
 110                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 111         }
 112         fn handle_shutdown(&self, their_node_id: &PublicKey, _their_features: &InitFeatures, msg: &msgs::Shutdown) {
 113                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 114         }
 115         fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &msgs::ClosingSigned) {
 116                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 117         }
 118         fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) {
 119                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 120         }
 121         fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) {
 122                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 123         }
 124         fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) {
 125                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 126         }
 127         fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) {
 128                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 129         }
 130         fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) {
 131                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 132         }
 133         fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) {
 134                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 135         }
 136         fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) {
 137                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 138         }
 139         fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) {
 140                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 141         }
 142         fn handle_channel_reestablish(&self, their_node_id: &PublicKey, msg: &msgs::ChannelReestablish) {
 143                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 144         }
 145         fn peer_disconnected(&self, _their_node_id: &PublicKey, _no_connection_possible: bool) {}
 146         fn peer_connected(&self, _their_node_id: &PublicKey, _msg: &msgs::Init) {}
 147         fn handle_error(&self, _their_node_id: &PublicKey, _msg: &msgs::ErrorMessage) {}
 148 }
 149 impl Deref for ErroringMessageHandler {
 150         type Target = ErroringMessageHandler;
 151         fn deref(&self) -> &Self { self }
 152 }
 153
 154 /// Provides references to trait impls which handle different types of messages.
 155 pub struct MessageHandler<CM: Deref, RM: Deref> where
 156                 CM::Target: ChannelMessageHandler,
 157                 RM::Target: RoutingMessageHandler {
 158         /// A message handler which handles messages specific to channels. Usually this is just a
 159         /// ChannelManager object or a ErroringMessageHandler.
 160         pub chan_handler: CM,
 161         /// A message handler which handles messages updating our knowledge of the network channel
 162         /// graph. Usually this is just a NetGraphMsgHandlerMonitor object or an IgnoringMessageHandler.
 163         pub route_handler: RM,
 164 }
 165
 166 /// Provides an object which can be used to send data to and which uniquely identifies a connection
 167 /// to a remote host. You will need to be able to generate multiple of these which meet Eq and
 168 /// implement Hash to meet the PeerManager API.
 169 ///
 170 /// For efficiency, Clone should be relatively cheap for this type.
 171 ///
 172 /// You probably want to just extend an int and put a file descriptor in a struct and implement
 173 /// send_data. Note that if you are using a higher-level net library that may call close() itself,
 174 /// be careful to ensure you don't have races whereby you might register a new connection with an
 175 /// fd which is the same as a previous one which has yet to be removed via
 176 /// PeerManager::socket_disconnected().
 177 pub trait SocketDescriptor : cmp::Eq + hash::Hash + Clone {
 178         /// Attempts to send some data from the given slice to the peer.
 179         ///
 180         /// Returns the amount of data which was sent, possibly 0 if the socket has since disconnected.
 181         /// Note that in the disconnected case, socket_disconnected must still fire and further write
 182         /// attempts may occur until that time.
 183         ///
 184         /// If the returned size is smaller than data.len(), a write_available event must
 185         /// trigger the next time more data can be written. Additionally, until the a send_data event
 186         /// completes fully, no further read_events should trigger on the same peer!
 187         ///
 188         /// If a read_event on this descriptor had previously returned true (indicating that read
 189         /// events should be paused to prevent DoS in the send buffer), resume_read may be set
 190         /// indicating that read events on this descriptor should resume. A resume_read of false does
 191         /// *not* imply that further read events should be paused.
 192         fn send_data(&mut self, data: &[u8], resume_read: bool) -> usize;
 193         /// Disconnect the socket pointed to by this SocketDescriptor. Once this function returns, no
 194         /// more calls to write_buffer_space_avail, read_event or socket_disconnected may be made with
 195         /// this descriptor. No socket_disconnected call should be generated as a result of this call,
 196         /// though races may occur whereby disconnect_socket is called after a call to
 197         /// socket_disconnected but prior to socket_disconnected returning.
 198         fn disconnect_socket(&mut self);
 199 }
 200
 201 /// Error for PeerManager errors. If you get one of these, you must disconnect the socket and
 202 /// generate no further read_event/write_buffer_space_avail/socket_disconnected calls for the
 203 /// descriptor.
 204 #[derive(Clone)]
 205 pub struct PeerHandleError {
 206         /// Used to indicate that we probably can't make any future connections to this peer, implying
 207         /// we should go ahead and force-close any channels we have with it.
 208         pub no_connection_possible: bool,
 209 }
 210 impl fmt::Debug for PeerHandleError {
 211         fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
 212                 formatter.write_str("Peer Sent Invalid Data")
 213         }
 214 }
 215 impl fmt::Display for PeerHandleError {
 216         fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
 217                 formatter.write_str("Peer Sent Invalid Data")
 218         }
 219 }
 220 impl error::Error for PeerHandleError {
 221         fn description(&self) -> &str {
 222                 "Peer Sent Invalid Data"
 223         }
 224 }
 225
 226 enum InitSyncTracker{
 227         NoSyncRequested,
 228         ChannelsSyncing(u64),
 229         NodesSyncing(PublicKey),
 230 }
 231
 232 struct Peer {
 233         channel_encryptor: PeerChannelEncryptor,
 234         outbound: bool,
 235         their_node_id: Option<PublicKey>,
 236         their_features: Option<InitFeatures>,
 237
 238         pending_outbound_buffer: LinkedList<Vec<u8>>,
 239         pending_outbound_buffer_first_msg_offset: usize,
 240         awaiting_write_event: bool,
 241
 242         pending_read_buffer: Vec<u8>,
 243         pending_read_buffer_pos: usize,
 244         pending_read_is_header: bool,
 245
 246         sync_status: InitSyncTracker,
 247
 248         awaiting_pong: bool,
 249 }
 250
 251 impl Peer {
 252         /// Returns true if the channel announcements/updates for the given channel should be
 253         /// forwarded to this peer.
 254         /// If we are sending our routing table to this peer and we have not yet sent channel
 255         /// announcements/updates for the given channel_id then we will send it when we get to that
 256         /// point and we shouldn't send it yet to avoid sending duplicate updates. If we've already
 257         /// sent the old versions, we should send the update, and so return true here.
 258         fn should_forward_channel_announcement(&self, channel_id: u64)->bool{
 259                 match self.sync_status {
 260                         InitSyncTracker::NoSyncRequested => true,
 261                         InitSyncTracker::ChannelsSyncing(i) => i < channel_id,
 262                         InitSyncTracker::NodesSyncing(_) => true,
 263                 }
 264         }
 265
 266         /// Similar to the above, but for node announcements indexed by node_id.
 267         fn should_forward_node_announcement(&self, node_id: PublicKey) -> bool {
 268                 match self.sync_status {
 269                         InitSyncTracker::NoSyncRequested => true,
 270                         InitSyncTracker::ChannelsSyncing(_) => false,
 271                         InitSyncTracker::NodesSyncing(pk) => pk < node_id,
 272                 }
 273         }
 274 }
 275
 276 struct PeerHolder<Descriptor: SocketDescriptor> {
 277         peers: HashMap<Descriptor, Peer>,
 278         /// Added to by do_read_event for cases where we pushed a message onto the send buffer but
 279         /// didn't call do_attempt_write_data to avoid reentrancy. Cleared in process_events()
 280         peers_needing_send: HashSet<Descriptor>,
 281         /// Only add to this set when noise completes:
 282         node_id_to_descriptor: HashMap<PublicKey, Descriptor>,
 283 }
 284
 285 #[cfg(not(any(target_pointer_width = "32", target_pointer_width = "64")))]
 286 fn _check_usize_is_32_or_64() {
 287         // See below, less than 32 bit pointers may be unsafe here!
 288         unsafe { mem::transmute::<*const usize, [u8; 4]>(panic!()); }
 289 }
 290
 291 /// SimpleArcPeerManager is useful when you need a PeerManager with a static lifetime, e.g.
 292 /// when you're using lightning-net-tokio (since tokio::spawn requires parameters with static
 293 /// lifetimes). Other times you can afford a reference, which is more efficient, in which case
 294 /// SimpleRefPeerManager is the more appropriate type. Defining these type aliases prevents
 295 /// issues such as overly long function definitions.
 296 pub type SimpleArcPeerManager<SD, M, T, F, C, L> = PeerManager<SD, Arc<SimpleArcChannelManager<M, T, F, L>>, Arc<NetGraphMsgHandler<Arc<C>, Arc<L>>>, Arc<L>>;
 297
 298 /// SimpleRefPeerManager is a type alias for a PeerManager reference, and is the reference
 299 /// counterpart to the SimpleArcPeerManager type alias. Use this type by default when you don't
 300 /// need a PeerManager with a static lifetime. You'll need a static lifetime in cases such as
 301 /// usage of lightning-net-tokio (since tokio::spawn requires parameters with static lifetimes).
 302 /// But if this is not necessary, using a reference is more efficient. Defining these type aliases
 303 /// helps with issues such as long function definitions.
 304 pub type SimpleRefPeerManager<'a, 'b, 'c, 'd, 'e, 'f, 'g, SD, M, T, F, C, L> = PeerManager<SD, SimpleRefChannelManager<'a, 'b, 'c, 'd, 'e, M, T, F, L>, &'e NetGraphMsgHandler<&'g C, &'f L>, &'f L>;
 305
 306 /// A PeerManager manages a set of peers, described by their SocketDescriptor and marshalls socket
 307 /// events into messages which it passes on to its MessageHandlers.
 308 ///
 309 /// Rather than using a plain PeerManager, it is preferable to use either a SimpleArcPeerManager
 310 /// a SimpleRefPeerManager, for conciseness. See their documentation for more details, but
 311 /// essentially you should default to using a SimpleRefPeerManager, and use a
 312 /// SimpleArcPeerManager when you require a PeerManager with a static lifetime, such as when
 313 /// you're using lightning-net-tokio.
 314 pub struct PeerManager<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, L: Deref> where
 315                 CM::Target: ChannelMessageHandler,
 316                 RM::Target: RoutingMessageHandler,
 317                 L::Target: Logger {
 318         message_handler: MessageHandler<CM, RM>,
 319         peers: Mutex<PeerHolder<Descriptor>>,
 320         our_node_secret: SecretKey,
 321         ephemeral_key_midstate: Sha256Engine,
 322
 323         // Usize needs to be at least 32 bits to avoid overflowing both low and high. If usize is 64
 324         // bits we will never realistically count into high:
 325         peer_counter_low: AtomicUsize,
 326         peer_counter_high: AtomicUsize,
 327
 328         logger: L,
 329 }
 330
 331 enum MessageHandlingError {
 332         PeerHandleError(PeerHandleError),
 333         LightningError(LightningError),
 334 }
 335
 336 impl From<PeerHandleError> for MessageHandlingError {
 337         fn from(error: PeerHandleError) -> Self {
 338                 MessageHandlingError::PeerHandleError(error)
 339         }
 340 }
 341
 342 impl From<LightningError> for MessageHandlingError {
 343         fn from(error: LightningError) -> Self {
 344                 MessageHandlingError::LightningError(error)
 345         }
 346 }
 347
 348 macro_rules! encode_msg {
 349         ($msg: expr) => {{
 350                 let mut buffer = VecWriter(Vec::new());
 351                 wire::write($msg, &mut buffer).unwrap();
 352                 buffer.0
 353         }}
 354 }
 355
 356 impl<Descriptor: SocketDescriptor, CM: Deref, L: Deref> PeerManager<Descriptor, CM, IgnoringMessageHandler, L> where
 357                 CM::Target: ChannelMessageHandler,
 358                 L::Target: Logger {
 359         /// Constructs a new PeerManager with the given ChannelMessageHandler. No routing message
 360         /// handler is used and network graph messages are ignored.
 361         ///
 362         /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
 363         /// cryptographically secure random bytes.
 364         ///
 365         /// (C-not exported) as we can't export a PeerManager with a dummy route handler
 366         pub fn new_channel_only(channel_message_handler: CM, our_node_secret: SecretKey, ephemeral_random_data: &[u8; 32], logger: L) -> Self {
 367                 Self::new(MessageHandler {
 368                         chan_handler: channel_message_handler,
 369                         route_handler: IgnoringMessageHandler{},
 370                 }, our_node_secret, ephemeral_random_data, logger)
 371         }
 372 }
 373
 374 impl<Descriptor: SocketDescriptor, RM: Deref, L: Deref> PeerManager<Descriptor, ErroringMessageHandler, RM, L> where
 375                 RM::Target: RoutingMessageHandler,
 376                 L::Target: Logger {
 377         /// Constructs a new PeerManager with the given RoutingMessageHandler. No channel message
 378         /// handler is used and messages related to channels will be ignored (or generate error
 379         /// messages). Note that some other lightning implementations time-out connections after some
 380         /// time if no channel is built with the peer.
 381         ///
 382         /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
 383         /// cryptographically secure random bytes.
 384         ///
 385         /// (C-not exported) as we can't export a PeerManager with a dummy channel handler
 386         pub fn new_routing_only(routing_message_handler: RM, our_node_secret: SecretKey, ephemeral_random_data: &[u8; 32], logger: L) -> Self {
 387                 Self::new(MessageHandler {
 388                         chan_handler: ErroringMessageHandler::new(),
 389                         route_handler: routing_message_handler,
 390                 }, our_node_secret, ephemeral_random_data, logger)
 391         }
 392 }
 393
 394 /// Manages and reacts to connection events. You probably want to use file descriptors as PeerIds.
 395 /// PeerIds may repeat, but only after socket_disconnected() has been called.
 396 impl<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, L: Deref> PeerManager<Descriptor, CM, RM, L> where
 397                 CM::Target: ChannelMessageHandler,
 398                 RM::Target: RoutingMessageHandler,
 399                 L::Target: Logger {
 400         /// Constructs a new PeerManager with the given message handlers and node_id secret key
 401         /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
 402         /// cryptographically secure random bytes.
 403         pub fn new(message_handler: MessageHandler<CM, RM>, our_node_secret: SecretKey, ephemeral_random_data: &[u8; 32], logger: L) -> Self {
 404                 let mut ephemeral_key_midstate = Sha256::engine();
 405                 ephemeral_key_midstate.input(ephemeral_random_data);
 406
 407                 PeerManager {
 408                         message_handler,
 409                         peers: Mutex::new(PeerHolder {
 410                                 peers: HashMap::new(),
 411                                 peers_needing_send: HashSet::new(),
 412                                 node_id_to_descriptor: HashMap::new()
 413                         }),
 414                         our_node_secret,
 415                         ephemeral_key_midstate,
 416                         peer_counter_low: AtomicUsize::new(0),
 417                         peer_counter_high: AtomicUsize::new(0),
 418                         logger,
 419                 }
 420         }
 421
 422         /// Get the list of node ids for peers which have completed the initial handshake.
 423         ///
 424         /// For outbound connections, this will be the same as the their_node_id parameter passed in to
 425         /// new_outbound_connection, however entries will only appear once the initial handshake has
 426         /// completed and we are sure the remote peer has the private key for the given node_id.
 427         pub fn get_peer_node_ids(&self) -> Vec<PublicKey> {
 428                 let peers = self.peers.lock().unwrap();
 429                 peers.peers.values().filter_map(|p| {
 430                         if !p.channel_encryptor.is_ready_for_encryption() || p.their_features.is_none() {
 431                                 return None;
 432                         }
 433                         p.their_node_id
 434                 }).collect()
 435         }
 436
 437         fn get_ephemeral_key(&self) -> SecretKey {
 438                 let mut ephemeral_hash = self.ephemeral_key_midstate.clone();
 439                 let low = self.peer_counter_low.fetch_add(1, Ordering::AcqRel);
 440                 let high = if low == 0 {
 441                         self.peer_counter_high.fetch_add(1, Ordering::AcqRel)
 442                 } else {
 443                         self.peer_counter_high.load(Ordering::Acquire)
 444                 };
 445                 ephemeral_hash.input(&byte_utils::le64_to_array(low as u64));
 446                 ephemeral_hash.input(&byte_utils::le64_to_array(high as u64));
 447                 SecretKey::from_slice(&Sha256::from_engine(ephemeral_hash).into_inner()).expect("You broke SHA-256!")
 448         }
 449
 450         /// Indicates a new outbound connection has been established to a node with the given node_id.
 451         /// Note that if an Err is returned here you MUST NOT call socket_disconnected for the new
 452         /// descriptor but must disconnect the connection immediately.
 453         ///
 454         /// Returns a small number of bytes to send to the remote node (currently always 50).
 455         ///
 456         /// Panics if descriptor is duplicative with some other descriptor which has not yet had a
 457         /// socket_disconnected().
 458         pub fn new_outbound_connection(&self, their_node_id: PublicKey, descriptor: Descriptor) -> Result<Vec<u8>, PeerHandleError> {
 459                 let mut peer_encryptor = PeerChannelEncryptor::new_outbound(their_node_id.clone(), self.get_ephemeral_key());
 460                 let res = peer_encryptor.get_act_one().to_vec();
 461                 let pending_read_buffer = [0; 50].to_vec(); // Noise act two is 50 bytes
 462
 463                 let mut peers = self.peers.lock().unwrap();
 464                 if peers.peers.insert(descriptor, Peer {
 465                         channel_encryptor: peer_encryptor,
 466                         outbound: true,
 467                         their_node_id: None,
 468                         their_features: None,
 469
 470                         pending_outbound_buffer: LinkedList::new(),
 471                         pending_outbound_buffer_first_msg_offset: 0,
 472                         awaiting_write_event: false,
 473
 474                         pending_read_buffer,
 475                         pending_read_buffer_pos: 0,
 476                         pending_read_is_header: false,
 477
 478                         sync_status: InitSyncTracker::NoSyncRequested,
 479
 480                         awaiting_pong: false,
 481                 }).is_some() {
 482                         panic!("PeerManager driver duplicated descriptors!");
 483                 };
 484                 Ok(res)
 485         }
 486
 487         /// Indicates a new inbound connection has been established.
 488         ///
 489         /// May refuse the connection by returning an Err, but will never write bytes to the remote end
 490         /// (outbound connector always speaks first). Note that if an Err is returned here you MUST NOT
 491         /// call socket_disconnected for the new descriptor but must disconnect the connection
 492         /// immediately.
 493         ///
 494         /// Panics if descriptor is duplicative with some other descriptor which has not yet had
 495         /// socket_disconnected called.
 496         pub fn new_inbound_connection(&self, descriptor: Descriptor) -> Result<(), PeerHandleError> {
 497                 let peer_encryptor = PeerChannelEncryptor::new_inbound(&self.our_node_secret);
 498                 let pending_read_buffer = [0; 50].to_vec(); // Noise act one is 50 bytes
 499
 500                 let mut peers = self.peers.lock().unwrap();
 501                 if peers.peers.insert(descriptor, Peer {
 502                         channel_encryptor: peer_encryptor,
 503                         outbound: false,
 504                         their_node_id: None,
 505                         their_features: None,
 506
 507                         pending_outbound_buffer: LinkedList::new(),
 508                         pending_outbound_buffer_first_msg_offset: 0,
 509                         awaiting_write_event: false,
 510
 511                         pending_read_buffer,
 512                         pending_read_buffer_pos: 0,
 513                         pending_read_is_header: false,
 514
 515                         sync_status: InitSyncTracker::NoSyncRequested,
 516
 517                         awaiting_pong: false,
 518                 }).is_some() {
 519                         panic!("PeerManager driver duplicated descriptors!");
 520                 };
 521                 Ok(())
 522         }
 523
 524         fn do_attempt_write_data(&self, descriptor: &mut Descriptor, peer: &mut Peer) {
 525                 macro_rules! encode_and_send_msg {
 526                         ($msg: expr) => {
 527                                 {
 528                                         log_trace!(self.logger, "Encoding and sending sync update message of type {} to {}", $msg.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
 529                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!($msg)[..]));
 530                                 }
 531                         }
 532                 }
 533                 const MSG_BUFF_SIZE: usize = 10;
 534                 while !peer.awaiting_write_event {
 535                         if peer.pending_outbound_buffer.len() < MSG_BUFF_SIZE {
 536                                 match peer.sync_status {
 537                                         InitSyncTracker::NoSyncRequested => {},
 538                                         InitSyncTracker::ChannelsSyncing(c) if c < 0xffff_ffff_ffff_ffff => {
 539                                                 let steps = ((MSG_BUFF_SIZE - peer.pending_outbound_buffer.len() + 2) / 3) as u8;
 540                                                 let all_messages = self.message_handler.route_handler.get_next_channel_announcements(c, steps);
 541                                                 for &(ref announce, ref update_a_option, ref update_b_option) in all_messages.iter() {
 542                                                         encode_and_send_msg!(announce);
 543                                                         if let &Some(ref update_a) = update_a_option {
 544                                                                 encode_and_send_msg!(update_a);
 545                                                         }
 546                                                         if let &Some(ref update_b) = update_b_option {
 547                                                                 encode_and_send_msg!(update_b);
 548                                                         }
 549                                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(announce.contents.short_channel_id + 1);
 550                                                 }
 551                                                 if all_messages.is_empty() || all_messages.len() != steps as usize {
 552                                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(0xffff_ffff_ffff_ffff);
 553                                                 }
 554                                         },
 555                                         InitSyncTracker::ChannelsSyncing(c) if c == 0xffff_ffff_ffff_ffff => {
 556                                                 let steps = (MSG_BUFF_SIZE - peer.pending_outbound_buffer.len()) as u8;
 557                                                 let all_messages = self.message_handler.route_handler.get_next_node_announcements(None, steps);
 558                                                 for msg in all_messages.iter() {
 559                                                         encode_and_send_msg!(msg);
 560                                                         peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
 561                                                 }
 562                                                 if all_messages.is_empty() || all_messages.len() != steps as usize {
 563                                                         peer.sync_status = InitSyncTracker::NoSyncRequested;
 564                                                 }
 565                                         },
 566                                         InitSyncTracker::ChannelsSyncing(_) => unreachable!(),
 567                                         InitSyncTracker::NodesSyncing(key) => {
 568                                                 let steps = (MSG_BUFF_SIZE - peer.pending_outbound_buffer.len()) as u8;
 569                                                 let all_messages = self.message_handler.route_handler.get_next_node_announcements(Some(&key), steps);
 570                                                 for msg in all_messages.iter() {
 571                                                         encode_and_send_msg!(msg);
 572                                                         peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
 573                                                 }
 574                                                 if all_messages.is_empty() || all_messages.len() != steps as usize {
 575                                                         peer.sync_status = InitSyncTracker::NoSyncRequested;
 576                                                 }
 577                                         },
 578                                 }
 579                         }
 580
 581                         if {
 582                                 let next_buff = match peer.pending_outbound_buffer.front() {
 583                                         None => return,
 584                                         Some(buff) => buff,
 585                                 };
 586
 587                                 let should_be_reading = peer.pending_outbound_buffer.len() < MSG_BUFF_SIZE;
 588                                 let pending = &next_buff[peer.pending_outbound_buffer_first_msg_offset..];
 589                                 let data_sent = descriptor.send_data(pending, should_be_reading);
 590                                 peer.pending_outbound_buffer_first_msg_offset += data_sent;
 591                                 if peer.pending_outbound_buffer_first_msg_offset == next_buff.len() { true } else { false }
 592                         } {
 593                                 peer.pending_outbound_buffer_first_msg_offset = 0;
 594                                 peer.pending_outbound_buffer.pop_front();
 595                         } else {
 596                                 peer.awaiting_write_event = true;
 597                         }
 598                 }
 599         }
 600
 601         /// Indicates that there is room to write data to the given socket descriptor.
 602         ///
 603         /// May return an Err to indicate that the connection should be closed.
 604         ///
 605         /// Will most likely call send_data on the descriptor passed in (or the descriptor handed into
 606         /// new_*\_connection) before returning. Thus, be very careful with reentrancy issues! The
 607         /// invariants around calling write_buffer_space_avail in case a write did not fully complete
 608         /// must still hold - be ready to call write_buffer_space_avail again if a write call generated
 609         /// here isn't sufficient! Panics if the descriptor was not previously registered in a
 610         /// new_\*_connection event.
 611         pub fn write_buffer_space_avail(&self, descriptor: &mut Descriptor) -> Result<(), PeerHandleError> {
 612                 let mut peers = self.peers.lock().unwrap();
 613                 match peers.peers.get_mut(descriptor) {
 614                         None => panic!("Descriptor for write_event is not already known to PeerManager"),
 615                         Some(peer) => {
 616                                 peer.awaiting_write_event = false;
 617                                 self.do_attempt_write_data(descriptor, peer);
 618                         }
 619                 };
 620                 Ok(())
 621         }
 622
 623         /// Indicates that data was read from the given socket descriptor.
 624         ///
 625         /// May return an Err to indicate that the connection should be closed.
 626         ///
 627         /// Will *not* call back into send_data on any descriptors to avoid reentrancy complexity.
 628         /// Thus, however, you almost certainly want to call process_events() after any read_event to
 629         /// generate send_data calls to handle responses.
 630         ///
 631         /// If Ok(true) is returned, further read_events should not be triggered until a send_data call
 632         /// on this file descriptor has resume_read set (preventing DoS issues in the send buffer).
 633         ///
 634         /// Panics if the descriptor was not previously registered in a new_*_connection event.
 635         pub fn read_event(&self, peer_descriptor: &mut Descriptor, data: &[u8]) -> Result<bool, PeerHandleError> {
 636                 match self.do_read_event(peer_descriptor, data) {
 637                         Ok(res) => Ok(res),
 638                         Err(e) => {
 639                                 self.disconnect_event_internal(peer_descriptor, e.no_connection_possible);
 640                                 Err(e)
 641                         }
 642                 }
 643         }
 644
 645         /// Append a message to a peer's pending outbound/write buffer, and update the map of peers needing sends accordingly.
 646         fn enqueue_message<M: Encode + Writeable>(&self, peers_needing_send: &mut HashSet<Descriptor>, peer: &mut Peer, descriptor: Descriptor, message: &M) {
 647                 let mut buffer = VecWriter(Vec::new());
 648                 wire::write(message, &mut buffer).unwrap(); // crash if the write failed
 649                 let encoded_message = buffer.0;
 650
 651                 log_trace!(self.logger, "Enqueueing message of type {} to {}", message.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
 652                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_message[..]));
 653                 peers_needing_send.insert(descriptor);
 654         }
 655
 656         fn do_read_event(&self, peer_descriptor: &mut Descriptor, data: &[u8]) -> Result<bool, PeerHandleError> {
 657                 let pause_read = {
 658                         let mut peers_lock = self.peers.lock().unwrap();
 659                         let peers = &mut *peers_lock;
 660                         let pause_read = match peers.peers.get_mut(peer_descriptor) {
 661                                 None => panic!("Descriptor for read_event is not already known to PeerManager"),
 662                                 Some(peer) => {
 663                                         assert!(peer.pending_read_buffer.len() > 0);
 664                                         assert!(peer.pending_read_buffer.len() > peer.pending_read_buffer_pos);
 665
 666                                         let mut read_pos = 0;
 667                                         while read_pos < data.len() {
 668                                                 {
 669                                                         let data_to_copy = cmp::min(peer.pending_read_buffer.len() - peer.pending_read_buffer_pos, data.len() - read_pos);
 670                                                         peer.pending_read_buffer[peer.pending_read_buffer_pos..peer.pending_read_buffer_pos + data_to_copy].copy_from_slice(&data[read_pos..read_pos + data_to_copy]);
 671                                                         read_pos += data_to_copy;
 672                                                         peer.pending_read_buffer_pos += data_to_copy;
 673                                                 }
 674
 675                                                 if peer.pending_read_buffer_pos == peer.pending_read_buffer.len() {
 676                                                         peer.pending_read_buffer_pos = 0;
 677
 678                                                         macro_rules! try_potential_handleerror {
 679                                                                 ($thing: expr) => {
 680                                                                         match $thing {
 681                                                                                 Ok(x) => x,
 682                                                                                 Err(e) => {
 683                                                                                         match e.action {
 684                                                                                                 msgs::ErrorAction::DisconnectPeer { msg: _ } => {
 685                                                                                                         //TODO: Try to push msg
 686                                                                                                         log_trace!(self.logger, "Got Err handling message, disconnecting peer because {}", e.err);
 687                                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 688                                                                                                 },
 689                                                                                                 msgs::ErrorAction::IgnoreError => {
 690                                                                                                         log_trace!(self.logger, "Got Err handling message, ignoring because {}", e.err);
 691                                                                                                         continue;
 692                                                                                                 },
 693                                                                                                 msgs::ErrorAction::SendErrorMessage { msg } => {
 694                                                                                                         log_trace!(self.logger, "Got Err handling message, sending Error message because {}", e.err);
 695                                                                                                         self.enqueue_message(&mut peers.peers_needing_send, peer, peer_descriptor.clone(), &msg);
 696                                                                                                         continue;
 697                                                                                                 },
 698                                                                                         }
 699                                                                                 }
 700                                                                         };
 701                                                                 }
 702                                                         }
 703
 704                                                         macro_rules! insert_node_id {
 705                                                                 () => {
 706                                                                         match peers.node_id_to_descriptor.entry(peer.their_node_id.unwrap()) {
 707                                                                                 hash_map::Entry::Occupied(_) => {
 708                                                                                         log_trace!(self.logger, "Got second connection with {}, closing", log_pubkey!(peer.their_node_id.unwrap()));
 709                                                                                         peer.their_node_id = None; // Unset so that we don't generate a peer_disconnected event
 710                                                                                         return Err(PeerHandleError{ no_connection_possible: false })
 711                                                                                 },
 712                                                                                 hash_map::Entry::Vacant(entry) => {
 713                                                                                         log_trace!(self.logger, "Finished noise handshake for connection with {}", log_pubkey!(peer.their_node_id.unwrap()));
 714                                                                                         entry.insert(peer_descriptor.clone())
 715                                                                                 },
 716                                                                         };
 717                                                                 }
 718                                                         }
 719
 720                                                         let next_step = peer.channel_encryptor.get_noise_step();
 721                                                         match next_step {
 722                                                                 NextNoiseStep::ActOne => {
 723                                                                         let act_two = try_potential_handleerror!(peer.channel_encryptor.process_act_one_with_keys(&peer.pending_read_buffer[..], &self.our_node_secret, self.get_ephemeral_key())).to_vec();
 724                                                                         peer.pending_outbound_buffer.push_back(act_two);
 725                                                                         peer.pending_read_buffer = [0; 66].to_vec(); // act three is 66 bytes long
 726                                                                 },
 727                                                                 NextNoiseStep::ActTwo => {
 728                                                                         let (act_three, their_node_id) = try_potential_handleerror!(peer.channel_encryptor.process_act_two(&peer.pending_read_buffer[..], &self.our_node_secret));
 729                                                                         peer.pending_outbound_buffer.push_back(act_three.to_vec());
 730                                                                         peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
 731                                                                         peer.pending_read_is_header = true;
 732
 733                                                                         peer.their_node_id = Some(their_node_id);
 734                                                                         insert_node_id!();
 735                                                                         let features = InitFeatures::known();
 736                                                                         let resp = msgs::Init { features };
 737                                                                         self.enqueue_message(&mut peers.peers_needing_send, peer, peer_descriptor.clone(), &resp);
 738                                                                 },
 739                                                                 NextNoiseStep::ActThree => {
 740                                                                         let their_node_id = try_potential_handleerror!(peer.channel_encryptor.process_act_three(&peer.pending_read_buffer[..]));
 741                                                                         peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
 742                                                                         peer.pending_read_is_header = true;
 743                                                                         peer.their_node_id = Some(their_node_id);
 744                                                                         insert_node_id!();
 745                                                                 },
 746                                                                 NextNoiseStep::NoiseComplete => {
 747                                                                         if peer.pending_read_is_header {
 748                                                                                 let msg_len = try_potential_handleerror!(peer.channel_encryptor.decrypt_length_header(&peer.pending_read_buffer[..]));
 749                                                                                 peer.pending_read_buffer = Vec::with_capacity(msg_len as usize + 16);
 750                                                                                 peer.pending_read_buffer.resize(msg_len as usize + 16, 0);
 751                                                                                 if msg_len < 2 { // Need at least the message type tag
 752                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 753                                                                                 }
 754                                                                                 peer.pending_read_is_header = false;
 755                                                                         } else {
 756                                                                                 let msg_data = try_potential_handleerror!(peer.channel_encryptor.decrypt_message(&peer.pending_read_buffer[..]));
 757                                                                                 assert!(msg_data.len() >= 2);
 758
 759                                                                                 // Reset read buffer
 760                                                                                 peer.pending_read_buffer = [0; 18].to_vec();
 761                                                                                 peer.pending_read_is_header = true;
 762
 763                                                                                 let mut reader = ::std::io::Cursor::new(&msg_data[..]);
 764                                                                                 let message_result = wire::read(&mut reader);
 765                                                                                 let message = match message_result {
 766                                                                                         Ok(x) => x,
 767                                                                                         Err(e) => {
 768                                                                                                 match e {
 769                                                                                                         msgs::DecodeError::UnknownVersion => return Err(PeerHandleError { no_connection_possible: false }),
 770                                                                                                         msgs::DecodeError::UnknownRequiredFeature => {
 771                                                                                                                 log_debug!(self.logger, "Got a channel/node announcement with an known required feature flag, you may want to update!");
 772                                                                                                                 continue;
 773                                                                                                         }
 774                                                                                                         msgs::DecodeError::InvalidValue => {
 775                                                                                                                 log_debug!(self.logger, "Got an invalid value while deserializing message");
 776                                                                                                                 return Err(PeerHandleError { no_connection_possible: false });
 777                                                                                                         }
 778                                                                                                         msgs::DecodeError::ShortRead => {
 779                                                                                                                 log_debug!(self.logger, "Deserialization failed due to shortness of message");
 780                                                                                                                 return Err(PeerHandleError { no_connection_possible: false });
 781                                                                                                         }
 782                                                                                                         msgs::DecodeError::BadLengthDescriptor => return Err(PeerHandleError { no_connection_possible: false }),
 783                                                                                                         msgs::DecodeError::Io(_) => return Err(PeerHandleError { no_connection_possible: false }),
 784                                                                                                 }
 785                                                                                         }
 786                                                                                 };
 787
 788                                                                                 if let Err(handling_error) = self.handle_message(&mut peers.peers_needing_send, peer, peer_descriptor.clone(), message){
 789                                                                                         match handling_error {
 790                                                                                                 MessageHandlingError::PeerHandleError(e) => { return Err(e) },
 791                                                                                                 MessageHandlingError::LightningError(e) => {
 792                                                                                                         try_potential_handleerror!(Err(e));
 793                                                                                                 },
 794                                                                                         }
 795                                                                                 }
 796                                                                         }
 797                                                                 }
 798                                                         }
 799                                                 }
 800                                         }
 801
 802                                         self.do_attempt_write_data(peer_descriptor, peer);
 803
 804                                         peer.pending_outbound_buffer.len() > 10 // pause_read
 805                                 }
 806                         };
 807
 808                         pause_read
 809                 };
 810
 811                 Ok(pause_read)
 812         }
 813
 814         /// Process an incoming message and return a decision (ok, lightning error, peer handling error) regarding the next action with the peer
 815         fn handle_message(&self, peers_needing_send: &mut HashSet<Descriptor>, peer: &mut Peer, peer_descriptor: Descriptor, message: wire::Message) -> Result<(), MessageHandlingError> {
 816                 log_trace!(self.logger, "Received message of type {} from {}", message.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
 817
 818                 // Need an Init as first message
 819                 if let wire::Message::Init(_) = message {
 820                 } else if peer.their_features.is_none() {
 821                         log_trace!(self.logger, "Peer {} sent non-Init first message", log_pubkey!(peer.their_node_id.unwrap()));
 822                         return Err(PeerHandleError{ no_connection_possible: false }.into());
 823                 }
 824
 825                 match message {
 826                         // Setup and Control messages:
 827                         wire::Message::Init(msg) => {
 828                                 if msg.features.requires_unknown_bits() {
 829                                         log_info!(self.logger, "Peer features required unknown version bits");
 830                                         return Err(PeerHandleError{ no_connection_possible: true }.into());
 831                                 }
 832                                 if peer.their_features.is_some() {
 833                                         return Err(PeerHandleError{ no_connection_possible: false }.into());
 834                                 }
 835
 836                                 log_info!(
 837                                         self.logger, "Received peer Init message: data_loss_protect: {}, initial_routing_sync: {}, upfront_shutdown_script: {}, gossip_queries: {}, static_remote_key: {}, unknown flags (local and global): {}",
 838                                         if msg.features.supports_data_loss_protect() { "supported" } else { "not supported"},
 839                                         if msg.features.initial_routing_sync() { "requested" } else { "not requested" },
 840                                         if msg.features.supports_upfront_shutdown_script() { "supported" } else { "not supported"},
 841                                         if msg.features.supports_gossip_queries() { "supported" } else { "not supported" },
 842                                         if msg.features.supports_static_remote_key() { "supported" } else { "not supported"},
 843                                         if msg.features.supports_unknown_bits() { "present" } else { "none" }
 844                                 );
 845
 846                                 if msg.features.initial_routing_sync() {
 847                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(0);
 848                                         peers_needing_send.insert(peer_descriptor.clone());
 849                                 }
 850                                 if !msg.features.supports_static_remote_key() {
 851                                         log_debug!(self.logger, "Peer {} does not support static remote key, disconnecting with no_connection_possible", log_pubkey!(peer.their_node_id.unwrap()));
 852                                         return Err(PeerHandleError{ no_connection_possible: true }.into());
 853                                 }
 854
 855                                 if !peer.outbound {
 856                                         let features = InitFeatures::known();
 857                                         let resp = msgs::Init { features };
 858                                         self.enqueue_message(peers_needing_send, peer, peer_descriptor.clone(), &resp);
 859                                 }
 860
 861                                 self.message_handler.route_handler.sync_routing_table(&peer.their_node_id.unwrap(), &msg);
 862
 863                                 self.message_handler.chan_handler.peer_connected(&peer.their_node_id.unwrap(), &msg);
 864                                 peer.their_features = Some(msg.features);
 865                         },
 866                         wire::Message::Error(msg) => {
 867                                 let mut data_is_printable = true;
 868                                 for b in msg.data.bytes() {
 869                                         if b < 32 || b > 126 {
 870                                                 data_is_printable = false;
 871                                                 break;
 872                                         }
 873                                 }
 874
 875                                 if data_is_printable {
 876                                         log_debug!(self.logger, "Got Err message from {}: {}", log_pubkey!(peer.their_node_id.unwrap()), msg.data);
 877                                 } else {
 878                                         log_debug!(self.logger, "Got Err message from {} with non-ASCII error message", log_pubkey!(peer.their_node_id.unwrap()));
 879                                 }
 880                                 self.message_handler.chan_handler.handle_error(&peer.their_node_id.unwrap(), &msg);
 881                                 if msg.channel_id == [0; 32] {
 882                                         return Err(PeerHandleError{ no_connection_possible: true }.into());
 883                                 }
 884                         },
 885
 886                         wire::Message::Ping(msg) => {
 887                                 if msg.ponglen < 65532 {
 888                                         let resp = msgs::Pong { byteslen: msg.ponglen };
 889                                         self.enqueue_message(peers_needing_send, peer, peer_descriptor.clone(), &resp);
 890                                 }
 891                         },
 892                         wire::Message::Pong(_msg) => {
 893                                 peer.awaiting_pong = false;
 894                         },
 895
 896                         // Channel messages:
 897                         wire::Message::OpenChannel(msg) => {
 898                                 self.message_handler.chan_handler.handle_open_channel(&peer.their_node_id.unwrap(), peer.their_features.clone().unwrap(), &msg);
 899                         },
 900                         wire::Message::AcceptChannel(msg) => {
 901                                 self.message_handler.chan_handler.handle_accept_channel(&peer.their_node_id.unwrap(), peer.their_features.clone().unwrap(), &msg);
 902                         },
 903
 904                         wire::Message::FundingCreated(msg) => {
 905                                 self.message_handler.chan_handler.handle_funding_created(&peer.their_node_id.unwrap(), &msg);
 906                         },
 907                         wire::Message::FundingSigned(msg) => {
 908                                 self.message_handler.chan_handler.handle_funding_signed(&peer.their_node_id.unwrap(), &msg);
 909                         },
 910                         wire::Message::FundingLocked(msg) => {
 911                                 self.message_handler.chan_handler.handle_funding_locked(&peer.their_node_id.unwrap(), &msg);
 912                         },
 913
 914                         wire::Message::Shutdown(msg) => {
 915                                 self.message_handler.chan_handler.handle_shutdown(&peer.their_node_id.unwrap(), peer.their_features.as_ref().unwrap(), &msg);
 916                         },
 917                         wire::Message::ClosingSigned(msg) => {
 918                                 self.message_handler.chan_handler.handle_closing_signed(&peer.their_node_id.unwrap(), &msg);
 919                         },
 920
 921                         // Commitment messages:
 922                         wire::Message::UpdateAddHTLC(msg) => {
 923                                 self.message_handler.chan_handler.handle_update_add_htlc(&peer.their_node_id.unwrap(), &msg);
 924                         },
 925                         wire::Message::UpdateFulfillHTLC(msg) => {
 926                                 self.message_handler.chan_handler.handle_update_fulfill_htlc(&peer.their_node_id.unwrap(), &msg);
 927                         },
 928                         wire::Message::UpdateFailHTLC(msg) => {
 929                                 self.message_handler.chan_handler.handle_update_fail_htlc(&peer.their_node_id.unwrap(), &msg);
 930                         },
 931                         wire::Message::UpdateFailMalformedHTLC(msg) => {
 932                                 self.message_handler.chan_handler.handle_update_fail_malformed_htlc(&peer.their_node_id.unwrap(), &msg);
 933                         },
 934
 935                         wire::Message::CommitmentSigned(msg) => {
 936                                 self.message_handler.chan_handler.handle_commitment_signed(&peer.their_node_id.unwrap(), &msg);
 937                         },
 938                         wire::Message::RevokeAndACK(msg) => {
 939                                 self.message_handler.chan_handler.handle_revoke_and_ack(&peer.their_node_id.unwrap(), &msg);
 940                         },
 941                         wire::Message::UpdateFee(msg) => {
 942                                 self.message_handler.chan_handler.handle_update_fee(&peer.their_node_id.unwrap(), &msg);
 943                         },
 944                         wire::Message::ChannelReestablish(msg) => {
 945                                 self.message_handler.chan_handler.handle_channel_reestablish(&peer.their_node_id.unwrap(), &msg);
 946                         },
 947
 948                         // Routing messages:
 949                         wire::Message::AnnouncementSignatures(msg) => {
 950                                 self.message_handler.chan_handler.handle_announcement_signatures(&peer.their_node_id.unwrap(), &msg);
 951                         },
 952                         wire::Message::ChannelAnnouncement(msg) => {
 953                                 let should_forward = match self.message_handler.route_handler.handle_channel_announcement(&msg) {
 954                                         Ok(v) => v,
 955                                         Err(e) => { return Err(e.into()); },
 956                                 };
 957
 958                                 if should_forward {
 959                                         // TODO: forward msg along to all our other peers!
 960                                 }
 961                         },
 962                         wire::Message::NodeAnnouncement(msg) => {
 963                                 let should_forward = match self.message_handler.route_handler.handle_node_announcement(&msg) {
 964                                         Ok(v) => v,
 965                                         Err(e) => { return Err(e.into()); },
 966                                 };
 967
 968                                 if should_forward {
 969                                         // TODO: forward msg along to all our other peers!
 970                                 }
 971                         },
 972                         wire::Message::ChannelUpdate(msg) => {
 973                                 let should_forward = match self.message_handler.route_handler.handle_channel_update(&msg) {
 974                                         Ok(v) => v,
 975                                         Err(e) => { return Err(e.into()); },
 976                                 };
 977
 978                                 if should_forward {
 979                                         // TODO: forward msg along to all our other peers!
 980                                 }
 981                         },
 982                         wire::Message::QueryShortChannelIds(msg) => {
 983                                 self.message_handler.route_handler.handle_query_short_channel_ids(&peer.their_node_id.unwrap(), msg)?;
 984                         },
 985                         wire::Message::ReplyShortChannelIdsEnd(msg) => {
 986                                 self.message_handler.route_handler.handle_reply_short_channel_ids_end(&peer.their_node_id.unwrap(), msg)?;
 987                         },
 988                         wire::Message::QueryChannelRange(msg) => {
 989                                 self.message_handler.route_handler.handle_query_channel_range(&peer.their_node_id.unwrap(), msg)?;
 990                         },
 991                         wire::Message::ReplyChannelRange(msg) => {
 992                                 self.message_handler.route_handler.handle_reply_channel_range(&peer.their_node_id.unwrap(), msg)?;
 993                         },
 994                         wire::Message::GossipTimestampFilter(_msg) => {
 995                                 // TODO: handle message
 996                         },
 997
 998                         // Unknown messages:
 999                         wire::Message::Unknown(msg_type) if msg_type.is_even() => {
1000                                 log_debug!(self.logger, "Received unknown even message of type {}, disconnecting peer!", msg_type);
1001                                 // Fail the channel if message is an even, unknown type as per BOLT #1.
1002                                 return Err(PeerHandleError{ no_connection_possible: true }.into());
1003                         },
1004                         wire::Message::Unknown(msg_type) => {
1005                                 log_trace!(self.logger, "Received unknown odd message of type {}, ignoring", msg_type);
1006                         }
1007                 };
1008                 Ok(())
1009         }
1010
1011         /// Checks for any events generated by our handlers and processes them. Includes sending most
1012         /// response messages as well as messages generated by calls to handler functions directly (eg
1013         /// functions like ChannelManager::process_pending_htlc_forward or send_payment).
1014         pub fn process_events(&self) {
1015                 {
1016                         // TODO: There are some DoS attacks here where you can flood someone's outbound send
1017                         // buffer by doing things like announcing channels on another node. We should be willing to
1018                         // drop optional-ish messages when send buffers get full!
1019
1020                         let mut events_generated = self.message_handler.chan_handler.get_and_clear_pending_msg_events();
1021                         events_generated.append(&mut self.message_handler.route_handler.get_and_clear_pending_msg_events());
1022                         let mut peers_lock = self.peers.lock().unwrap();
1023                         let peers = &mut *peers_lock;
1024                         for event in events_generated.drain(..) {
1025                                 macro_rules! get_peer_for_forwarding {
1026                                         ($node_id: expr, $handle_no_such_peer: block) => {
1027                                                 {
1028                                                         let descriptor = match peers.node_id_to_descriptor.get($node_id) {
1029                                                                 Some(descriptor) => descriptor.clone(),
1030                                                                 None => {
1031                                                                         $handle_no_such_peer;
1032                                                                         continue;
1033                                                                 },
1034                                                         };
1035                                                         match peers.peers.get_mut(&descriptor) {
1036                                                                 Some(peer) => {
1037                                                                         if peer.their_features.is_none() {
1038                                                                                 $handle_no_such_peer;
1039                                                                                 continue;
1040                                                                         }
1041                                                                         (descriptor, peer)
1042                                                                 },
1043                                                                 None => panic!("Inconsistent peers set state!"),
1044                                                         }
1045                                                 }
1046                                         }
1047                                 }
1048                                 match event {
1049                                         MessageSendEvent::SendAcceptChannel { ref node_id, ref msg } => {
1050                                                 log_trace!(self.logger, "Handling SendAcceptChannel event in peer_handler for node {} for channel {}",
1051                                                                 log_pubkey!(node_id),
1052                                                                 log_bytes!(msg.temporary_channel_id));
1053                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1054                                                                 //TODO: Drop the pending channel? (or just let it timeout, but that sucks)
1055                                                         });
1056                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1057                                                 self.do_attempt_write_data(&mut descriptor, peer);
1058                                         },
1059                                         MessageSendEvent::SendOpenChannel { ref node_id, ref msg } => {
1060                                                 log_trace!(self.logger, "Handling SendOpenChannel event in peer_handler for node {} for channel {}",
1061                                                                 log_pubkey!(node_id),
1062                                                                 log_bytes!(msg.temporary_channel_id));
1063                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1064                                                                 //TODO: Drop the pending channel? (or just let it timeout, but that sucks)
1065                                                         });
1066                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1067                                                 self.do_attempt_write_data(&mut descriptor, peer);
1068                                         },
1069                                         MessageSendEvent::SendFundingCreated { ref node_id, ref msg } => {
1070                                                 log_trace!(self.logger, "Handling SendFundingCreated event in peer_handler for node {} for channel {} (which becomes {})",
1071                                                                 log_pubkey!(node_id),
1072                                                                 log_bytes!(msg.temporary_channel_id),
1073                                                                 log_funding_channel_id!(msg.funding_txid, msg.funding_output_index));
1074                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1075                                                                 //TODO: generate a DiscardFunding event indicating to the wallet that
1076                                                                 //they should just throw away this funding transaction
1077                                                         });
1078                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1079                                                 self.do_attempt_write_data(&mut descriptor, peer);
1080                                         },
1081                                         MessageSendEvent::SendFundingSigned { ref node_id, ref msg } => {
1082                                                 log_trace!(self.logger, "Handling SendFundingSigned event in peer_handler for node {} for channel {}",
1083                                                                 log_pubkey!(node_id),
1084                                                                 log_bytes!(msg.channel_id));
1085                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1086                                                                 //TODO: generate a DiscardFunding event indicating to the wallet that
1087                                                                 //they should just throw away this funding transaction
1088                                                         });
1089                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1090                                                 self.do_attempt_write_data(&mut descriptor, peer);
1091                                         },
1092                                         MessageSendEvent::SendFundingLocked { ref node_id, ref msg } => {
1093                                                 log_trace!(self.logger, "Handling SendFundingLocked event in peer_handler for node {} for channel {}",
1094                                                                 log_pubkey!(node_id),
1095                                                                 log_bytes!(msg.channel_id));
1096                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1097                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
1098                                                         });
1099                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1100                                                 self.do_attempt_write_data(&mut descriptor, peer);
1101                                         },
1102                                         MessageSendEvent::SendAnnouncementSignatures { ref node_id, ref msg } => {
1103                                                 log_trace!(self.logger, "Handling SendAnnouncementSignatures event in peer_handler for node {} for channel {})",
1104                                                                 log_pubkey!(node_id),
1105                                                                 log_bytes!(msg.channel_id));
1106                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1107                                                                 //TODO: generate a DiscardFunding event indicating to the wallet that
1108                                                                 //they should just throw away this funding transaction
1109                                                         });
1110                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1111                                                 self.do_attempt_write_data(&mut descriptor, peer);
1112                                         },
1113                                         MessageSendEvent::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 update_fee, ref commitment_signed } } => {
1114                                                 log_trace!(self.logger, "Handling UpdateHTLCs event in peer_handler for node {} with {} adds, {} fulfills, {} fails for channel {}",
1115                                                                 log_pubkey!(node_id),
1116                                                                 update_add_htlcs.len(),
1117                                                                 update_fulfill_htlcs.len(),
1118                                                                 update_fail_htlcs.len(),
1119                                                                 log_bytes!(commitment_signed.channel_id));
1120                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1121                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
1122                                                         });
1123                                                 for msg in update_add_htlcs {
1124                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1125                                                 }
1126                                                 for msg in update_fulfill_htlcs {
1127                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1128                                                 }
1129                                                 for msg in update_fail_htlcs {
1130                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1131                                                 }
1132                                                 for msg in update_fail_malformed_htlcs {
1133                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1134                                                 }
1135                                                 if let &Some(ref msg) = update_fee {
1136                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1137                                                 }
1138                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(commitment_signed)));
1139                                                 self.do_attempt_write_data(&mut descriptor, peer);
1140                                         },
1141                                         MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
1142                                                 log_trace!(self.logger, "Handling SendRevokeAndACK event in peer_handler for node {} for channel {}",
1143                                                                 log_pubkey!(node_id),
1144                                                                 log_bytes!(msg.channel_id));
1145                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1146                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
1147                                                         });
1148                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1149                                                 self.do_attempt_write_data(&mut descriptor, peer);
1150                                         },
1151                                         MessageSendEvent::SendClosingSigned { ref node_id, ref msg } => {
1152                                                 log_trace!(self.logger, "Handling SendClosingSigned event in peer_handler for node {} for channel {}",
1153                                                                 log_pubkey!(node_id),
1154                                                                 log_bytes!(msg.channel_id));
1155                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1156                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
1157                                                         });
1158                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1159                                                 self.do_attempt_write_data(&mut descriptor, peer);
1160                                         },
1161                                         MessageSendEvent::SendShutdown { ref node_id, ref msg } => {
1162                                                 log_trace!(self.logger, "Handling Shutdown event in peer_handler for node {} for channel {}",
1163                                                                 log_pubkey!(node_id),
1164                                                                 log_bytes!(msg.channel_id));
1165                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1166                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
1167                                                         });
1168                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1169                                                 self.do_attempt_write_data(&mut descriptor, peer);
1170                                         },
1171                                         MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
1172                                                 log_trace!(self.logger, "Handling SendChannelReestablish event in peer_handler for node {} for channel {}",
1173                                                                 log_pubkey!(node_id),
1174                                                                 log_bytes!(msg.channel_id));
1175                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1176                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
1177                                                         });
1178                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1179                                                 self.do_attempt_write_data(&mut descriptor, peer);
1180                                         },
1181                                         MessageSendEvent::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
1182                                                 log_trace!(self.logger, "Handling BroadcastChannelAnnouncement event in peer_handler for short channel id {}", msg.contents.short_channel_id);
1183                                                 if self.message_handler.route_handler.handle_channel_announcement(msg).is_ok() && self.message_handler.route_handler.handle_channel_update(update_msg).is_ok() {
1184                                                         let encoded_msg = encode_msg!(msg);
1185                                                         let encoded_update_msg = encode_msg!(update_msg);
1186
1187                                                         for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
1188                                                                 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1189                                                                                 !peer.should_forward_channel_announcement(msg.contents.short_channel_id) {
1190                                                                         continue
1191                                                                 }
1192                                                                 match peer.their_node_id {
1193                                                                         None => continue,
1194                                                                         Some(their_node_id) => {
1195                                                                                 if their_node_id == msg.contents.node_id_1 || their_node_id == msg.contents.node_id_2 {
1196                                                                                         continue
1197                                                                                 }
1198                                                                         }
1199                                                                 }
1200                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
1201                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_update_msg[..]));
1202                                                                 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
1203                                                         }
1204                                                 }
1205                                         },
1206                                         MessageSendEvent::BroadcastNodeAnnouncement { ref msg } => {
1207                                                 log_trace!(self.logger, "Handling BroadcastNodeAnnouncement event in peer_handler");
1208                                                 if self.message_handler.route_handler.handle_node_announcement(msg).is_ok() {
1209                                                         let encoded_msg = encode_msg!(msg);
1210
1211                                                         for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
1212                                                                 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1213                                                                                 !peer.should_forward_node_announcement(msg.contents.node_id) {
1214                                                                         continue
1215                                                                 }
1216                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
1217                                                                 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
1218                                                         }
1219                                                 }
1220                                         },
1221                                         MessageSendEvent::BroadcastChannelUpdate { ref msg } => {
1222                                                 log_trace!(self.logger, "Handling BroadcastChannelUpdate event in peer_handler for short channel id {}", msg.contents.short_channel_id);
1223                                                 if self.message_handler.route_handler.handle_channel_update(msg).is_ok() {
1224                                                         let encoded_msg = encode_msg!(msg);
1225
1226                                                         for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
1227                                                                 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1228                                                                                 !peer.should_forward_channel_announcement(msg.contents.short_channel_id)  {
1229                                                                         continue
1230                                                                 }
1231                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
1232                                                                 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
1233                                                         }
1234                                                 }
1235                                         },
1236                                         MessageSendEvent::PaymentFailureNetworkUpdate { ref update } => {
1237                                                 self.message_handler.route_handler.handle_htlc_fail_channel_update(update);
1238                                         },
1239                                         MessageSendEvent::HandleError { ref node_id, ref action } => {
1240                                                 match *action {
1241                                                         msgs::ErrorAction::DisconnectPeer { ref msg } => {
1242                                                                 if let Some(mut descriptor) = peers.node_id_to_descriptor.remove(node_id) {
1243                                                                         peers.peers_needing_send.remove(&descriptor);
1244                                                                         if let Some(mut peer) = peers.peers.remove(&descriptor) {
1245                                                                                 if let Some(ref msg) = *msg {
1246                                                                                         log_trace!(self.logger, "Handling DisconnectPeer HandleError event in peer_handler for node {} with message {}",
1247                                                                                                         log_pubkey!(node_id),
1248                                                                                                         msg.data);
1249                                                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1250                                                                                         // This isn't guaranteed to work, but if there is enough free
1251                                                                                         // room in the send buffer, put the error message there...
1252                                                                                         self.do_attempt_write_data(&mut descriptor, &mut peer);
1253                                                                                 } else {
1254                                                                                         log_trace!(self.logger, "Handling DisconnectPeer HandleError event in peer_handler for node {} with no message", log_pubkey!(node_id));
1255                                                                                 }
1256                                                                         }
1257                                                                         descriptor.disconnect_socket();
1258                                                                         self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1259                                                                 }
1260                                                         },
1261                                                         msgs::ErrorAction::IgnoreError => {},
1262                                                         msgs::ErrorAction::SendErrorMessage { ref msg } => {
1263                                                                 log_trace!(self.logger, "Handling SendErrorMessage HandleError event in peer_handler for node {} with message {}",
1264                                                                                 log_pubkey!(node_id),
1265                                                                                 msg.data);
1266                                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1267                                                                         //TODO: Do whatever we're gonna do for handling dropped messages
1268                                                                 });
1269                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1270                                                                 self.do_attempt_write_data(&mut descriptor, peer);
1271                                                         },
1272                                                 }
1273                                         },
1274                                         MessageSendEvent::SendChannelRangeQuery { ref node_id, ref msg } => {
1275                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {});
1276                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1277                                                 self.do_attempt_write_data(&mut descriptor, peer);
1278                                         },
1279                                         MessageSendEvent::SendShortIdsQuery { ref node_id, ref msg } => {
1280                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {});
1281                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1282                                                 self.do_attempt_write_data(&mut descriptor, peer);
1283                                         }
1284                                 }
1285                         }
1286
1287                         for mut descriptor in peers.peers_needing_send.drain() {
1288                                 match peers.peers.get_mut(&descriptor) {
1289                                         Some(peer) => self.do_attempt_write_data(&mut descriptor, peer),
1290                                         None => panic!("Inconsistent peers set state!"),
1291                                 }
1292                         }
1293                 }
1294         }
1295
1296         /// Indicates that the given socket descriptor's connection is now closed.
1297         ///
1298         /// This must only be called if the socket has been disconnected by the peer or your own
1299         /// decision to disconnect it and must NOT be called in any case where other parts of this
1300         /// library (eg PeerHandleError, explicit disconnect_socket calls) instruct you to disconnect
1301         /// the peer.
1302         ///
1303         /// Panics if the descriptor was not previously registered in a successful new_*_connection event.
1304         pub fn socket_disconnected(&self, descriptor: &Descriptor) {
1305                 self.disconnect_event_internal(descriptor, false);
1306         }
1307
1308         fn disconnect_event_internal(&self, descriptor: &Descriptor, no_connection_possible: bool) {
1309                 let mut peers = self.peers.lock().unwrap();
1310                 peers.peers_needing_send.remove(descriptor);
1311                 let peer_option = peers.peers.remove(descriptor);
1312                 match peer_option {
1313                         None => panic!("Descriptor for disconnect_event is not already known to PeerManager"),
1314                         Some(peer) => {
1315                                 match peer.their_node_id {
1316                                         Some(node_id) => {
1317                                                 peers.node_id_to_descriptor.remove(&node_id);
1318                                                 self.message_handler.chan_handler.peer_disconnected(&node_id, no_connection_possible);
1319                                         },
1320                                         None => {}
1321                                 }
1322                         }
1323                 };
1324         }
1325
1326         /// Disconnect a peer given its node id.
1327         ///
1328         /// Set no_connection_possible to true to prevent any further connection with this peer,
1329         /// force-closing any channels we have with it.
1330         ///
1331         /// If a peer is connected, this will call `disconnect_socket` on the descriptor for the peer,
1332         /// so be careful about reentrancy issues.
1333         pub fn disconnect_by_node_id(&self, node_id: PublicKey, no_connection_possible: bool) {
1334                 let mut peers_lock = self.peers.lock().unwrap();
1335                 if let Some(mut descriptor) = peers_lock.node_id_to_descriptor.remove(&node_id) {
1336                         log_trace!(self.logger, "Disconnecting peer with id {} due to client request", node_id);
1337                         peers_lock.peers.remove(&descriptor);
1338                         peers_lock.peers_needing_send.remove(&descriptor);
1339                         self.message_handler.chan_handler.peer_disconnected(&node_id, no_connection_possible);
1340                         descriptor.disconnect_socket();
1341                 }
1342         }
1343
1344         /// This function should be called roughly once every 30 seconds.
1345         /// It will send pings to each peer and disconnect those which did not respond to the last round of pings.
1346
1347         /// Will most likely call send_data on all of the registered descriptors, thus, be very careful with reentrancy issues!
1348         pub fn timer_tick_occured(&self) {
1349                 let mut peers_lock = self.peers.lock().unwrap();
1350                 {
1351                         let peers = &mut *peers_lock;
1352                         let peers_needing_send = &mut peers.peers_needing_send;
1353                         let node_id_to_descriptor = &mut peers.node_id_to_descriptor;
1354                         let peers = &mut peers.peers;
1355                         let mut descriptors_needing_disconnect = Vec::new();
1356
1357                         peers.retain(|descriptor, peer| {
1358                                 if peer.awaiting_pong {
1359                                         peers_needing_send.remove(descriptor);
1360                                         descriptors_needing_disconnect.push(descriptor.clone());
1361                                         match peer.their_node_id {
1362                                                 Some(node_id) => {
1363                                                         log_trace!(self.logger, "Disconnecting peer with id {} due to ping timeout", node_id);
1364                                                         node_id_to_descriptor.remove(&node_id);
1365                                                         self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1366                                                 }
1367                                                 None => {
1368                                                         // This can't actually happen as we should have hit
1369                                                         // is_ready_for_encryption() previously on this same peer.
1370                                                         unreachable!();
1371                                                 },
1372                                         }
1373                                         return false;
1374                                 }
1375
1376                                 if !peer.channel_encryptor.is_ready_for_encryption() {
1377                                         // The peer needs to complete its handshake before we can exchange messages
1378                                         return true;
1379                                 }
1380
1381                                 let ping = msgs::Ping {
1382                                         ponglen: 0,
1383                                         byteslen: 64,
1384                                 };
1385                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(&ping)));
1386
1387                                 let mut descriptor_clone = descriptor.clone();
1388                                 self.do_attempt_write_data(&mut descriptor_clone, peer);
1389
1390                                 peer.awaiting_pong = true;
1391                                 true
1392                         });
1393
1394                         for mut descriptor in descriptors_needing_disconnect.drain(..) {
1395                                 descriptor.disconnect_socket();
1396                         }
1397                 }
1398         }
1399 }
1400
1401 #[cfg(test)]
1402 mod tests {
1403         use ln::peer_handler::{PeerManager, MessageHandler, SocketDescriptor};
1404         use ln::msgs;
1405         use util::events;
1406         use util::test_utils;
1407
1408         use bitcoin::secp256k1::Secp256k1;
1409         use bitcoin::secp256k1::key::{SecretKey, PublicKey};
1410
1411         use std;
1412         use std::sync::{Arc, Mutex};
1413         use std::sync::atomic::Ordering;
1414
1415         #[derive(Clone)]
1416         struct FileDescriptor {
1417                 fd: u16,
1418                 outbound_data: Arc<Mutex<Vec<u8>>>,
1419         }
1420         impl PartialEq for FileDescriptor {
1421                 fn eq(&self, other: &Self) -> bool {
1422                         self.fd == other.fd
1423                 }
1424         }
1425         impl Eq for FileDescriptor { }
1426         impl std::hash::Hash for FileDescriptor {
1427                 fn hash<H: std::hash::Hasher>(&self, hasher: &mut H) {
1428                         self.fd.hash(hasher)
1429                 }
1430         }
1431
1432         impl SocketDescriptor for FileDescriptor {
1433                 fn send_data(&mut self, data: &[u8], _resume_read: bool) -> usize {
1434                         self.outbound_data.lock().unwrap().extend_from_slice(data);
1435                         data.len()
1436                 }
1437
1438                 fn disconnect_socket(&mut self) {}
1439         }
1440
1441         struct PeerManagerCfg {
1442                 chan_handler: test_utils::TestChannelMessageHandler,
1443                 routing_handler: test_utils::TestRoutingMessageHandler,
1444                 logger: test_utils::TestLogger,
1445         }
1446
1447         fn create_peermgr_cfgs(peer_count: usize) -> Vec<PeerManagerCfg> {
1448                 let mut cfgs = Vec::new();
1449                 for _ in 0..peer_count {
1450                         cfgs.push(
1451                                 PeerManagerCfg{
1452                                         chan_handler: test_utils::TestChannelMessageHandler::new(),
1453                                         logger: test_utils::TestLogger::new(),
1454                                         routing_handler: test_utils::TestRoutingMessageHandler::new(),
1455                                 }
1456                         );
1457                 }
1458
1459                 cfgs
1460         }
1461
1462         fn create_network<'a>(peer_count: usize, cfgs: &'a Vec<PeerManagerCfg>) -> Vec<PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, &'a test_utils::TestLogger>> {
1463                 let mut peers = Vec::new();
1464                 for i in 0..peer_count {
1465                         let node_secret = SecretKey::from_slice(&[42 + i as u8; 32]).unwrap();
1466                         let ephemeral_bytes = [i as u8; 32];
1467                         let msg_handler = MessageHandler { chan_handler: &cfgs[i].chan_handler, route_handler: &cfgs[i].routing_handler };
1468                         let peer = PeerManager::new(msg_handler, node_secret, &ephemeral_bytes, &cfgs[i].logger);
1469                         peers.push(peer);
1470                 }
1471
1472                 peers
1473         }
1474
1475         fn establish_connection<'a>(peer_a: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, &'a test_utils::TestLogger>, peer_b: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, &'a test_utils::TestLogger>) -> (FileDescriptor, FileDescriptor) {
1476                 let secp_ctx = Secp256k1::new();
1477                 let a_id = PublicKey::from_secret_key(&secp_ctx, &peer_a.our_node_secret);
1478                 let mut fd_a = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
1479                 let mut fd_b = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
1480                 let initial_data = peer_b.new_outbound_connection(a_id, fd_b.clone()).unwrap();
1481                 peer_a.new_inbound_connection(fd_a.clone()).unwrap();
1482                 assert_eq!(peer_a.read_event(&mut fd_a, &initial_data).unwrap(), false);
1483                 assert_eq!(peer_b.read_event(&mut fd_b, &fd_a.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1484                 assert_eq!(peer_a.read_event(&mut fd_a, &fd_b.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1485                 (fd_a.clone(), fd_b.clone())
1486         }
1487
1488         #[test]
1489         fn test_disconnect_peer() {
1490                 // Simple test which builds a network of PeerManager, connects and brings them to NoiseState::Finished and
1491                 // push a DisconnectPeer event to remove the node flagged by id
1492                 let cfgs = create_peermgr_cfgs(2);
1493                 let chan_handler = test_utils::TestChannelMessageHandler::new();
1494                 let mut peers = create_network(2, &cfgs);
1495                 establish_connection(&peers[0], &peers[1]);
1496                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1497
1498                 let secp_ctx = Secp256k1::new();
1499                 let their_id = PublicKey::from_secret_key(&secp_ctx, &peers[1].our_node_secret);
1500
1501                 chan_handler.pending_events.lock().unwrap().push(events::MessageSendEvent::HandleError {
1502                         node_id: their_id,
1503                         action: msgs::ErrorAction::DisconnectPeer { msg: None },
1504                 });
1505                 assert_eq!(chan_handler.pending_events.lock().unwrap().len(), 1);
1506                 peers[0].message_handler.chan_handler = &chan_handler;
1507
1508                 peers[0].process_events();
1509                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 0);
1510         }
1511
1512         #[test]
1513         fn test_timer_tick_occurred() {
1514                 // Create peers, a vector of two peer managers, perform initial set up and check that peers[0] has one Peer.
1515                 let cfgs = create_peermgr_cfgs(2);
1516                 let peers = create_network(2, &cfgs);
1517                 establish_connection(&peers[0], &peers[1]);
1518                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1519
1520                 // peers[0] awaiting_pong is set to true, but the Peer is still connected
1521                 peers[0].timer_tick_occured();
1522                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1523
1524                 // Since timer_tick_occured() is called again when awaiting_pong is true, all Peers are disconnected
1525                 peers[0].timer_tick_occured();
1526                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 0);
1527         }
1528
1529         #[test]
1530         fn test_do_attempt_write_data() {
1531                 // Create 2 peers with custom TestRoutingMessageHandlers and connect them.
1532                 let cfgs = create_peermgr_cfgs(2);
1533                 cfgs[0].routing_handler.request_full_sync.store(true, Ordering::Release);
1534                 cfgs[1].routing_handler.request_full_sync.store(true, Ordering::Release);
1535                 let peers = create_network(2, &cfgs);
1536
1537                 // By calling establish_connect, we trigger do_attempt_write_data between
1538                 // the peers. Previously this function would mistakenly enter an infinite loop
1539                 // when there were more channel messages available than could fit into a peer's
1540                 // buffer. This issue would now be detected by this test (because we use custom
1541                 // RoutingMessageHandlers that intentionally return more channel messages
1542                 // than can fit into a peer's buffer).
1543                 let (mut fd_a, mut fd_b) = establish_connection(&peers[0], &peers[1]);
1544
1545                 // Make each peer to read the messages that the other peer just wrote to them.
1546                 peers[1].read_event(&mut fd_b, &fd_a.outbound_data.lock().unwrap().split_off(0)).unwrap();
1547                 peers[0].read_event(&mut fd_a, &fd_b.outbound_data.lock().unwrap().split_off(0)).unwrap();
1548
1549                 // Check that each peer has received the expected number of channel updates and channel
1550                 // announcements.
1551                 assert_eq!(cfgs[0].routing_handler.chan_upds_recvd.load(Ordering::Acquire), 100);
1552                 assert_eq!(cfgs[0].routing_handler.chan_anns_recvd.load(Ordering::Acquire), 50);
1553                 assert_eq!(cfgs[1].routing_handler.chan_upds_recvd.load(Ordering::Acquire), 100);
1554                 assert_eq!(cfgs[1].routing_handler.chan_anns_recvd.load(Ordering::Acquire), 50);
1555         }
1556 }