_ 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 pub 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 pub 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         // msgs::ChannelUpdate does not contain the channel_id field, so we just drop them.
 146         fn handle_channel_update(&self, _their_node_id: &PublicKey, _msg: &msgs::ChannelUpdate) {}
 147         fn peer_disconnected(&self, _their_node_id: &PublicKey, _no_connection_possible: bool) {}
 148         fn peer_connected(&self, _their_node_id: &PublicKey, _msg: &msgs::Init) {}
 149         fn handle_error(&self, _their_node_id: &PublicKey, _msg: &msgs::ErrorMessage) {}
 150 }
 151 impl Deref for ErroringMessageHandler {
 152         type Target = ErroringMessageHandler;
 153         fn deref(&self) -> &Self { self }
 154 }
 155
 156 /// Provides references to trait impls which handle different types of messages.
 157 pub struct MessageHandler<CM: Deref, RM: Deref> where
 158                 CM::Target: ChannelMessageHandler,
 159                 RM::Target: RoutingMessageHandler {
 160         /// A message handler which handles messages specific to channels. Usually this is just a
 161         /// ChannelManager object or a ErroringMessageHandler.
 162         pub chan_handler: CM,
 163         /// A message handler which handles messages updating our knowledge of the network channel
 164         /// graph. Usually this is just a NetGraphMsgHandlerMonitor object or an IgnoringMessageHandler.
 165         pub route_handler: RM,
 166 }
 167
 168 /// Provides an object which can be used to send data to and which uniquely identifies a connection
 169 /// to a remote host. You will need to be able to generate multiple of these which meet Eq and
 170 /// implement Hash to meet the PeerManager API.
 171 ///
 172 /// For efficiency, Clone should be relatively cheap for this type.
 173 ///
 174 /// You probably want to just extend an int and put a file descriptor in a struct and implement
 175 /// send_data. Note that if you are using a higher-level net library that may call close() itself,
 176 /// be careful to ensure you don't have races whereby you might register a new connection with an
 177 /// fd which is the same as a previous one which has yet to be removed via
 178 /// PeerManager::socket_disconnected().
 179 pub trait SocketDescriptor : cmp::Eq + hash::Hash + Clone {
 180         /// Attempts to send some data from the given slice to the peer.
 181         ///
 182         /// Returns the amount of data which was sent, possibly 0 if the socket has since disconnected.
 183         /// Note that in the disconnected case, socket_disconnected must still fire and further write
 184         /// attempts may occur until that time.
 185         ///
 186         /// If the returned size is smaller than data.len(), a write_available event must
 187         /// trigger the next time more data can be written. Additionally, until the a send_data event
 188         /// completes fully, no further read_events should trigger on the same peer!
 189         ///
 190         /// If a read_event on this descriptor had previously returned true (indicating that read
 191         /// events should be paused to prevent DoS in the send buffer), resume_read may be set
 192         /// indicating that read events on this descriptor should resume. A resume_read of false does
 193         /// *not* imply that further read events should be paused.
 194         fn send_data(&mut self, data: &[u8], resume_read: bool) -> usize;
 195         /// Disconnect the socket pointed to by this SocketDescriptor. Once this function returns, no
 196         /// more calls to write_buffer_space_avail, read_event or socket_disconnected may be made with
 197         /// this descriptor. No socket_disconnected call should be generated as a result of this call,
 198         /// though races may occur whereby disconnect_socket is called after a call to
 199         /// socket_disconnected but prior to socket_disconnected returning.
 200         fn disconnect_socket(&mut self);
 201 }
 202
 203 /// Error for PeerManager errors. If you get one of these, you must disconnect the socket and
 204 /// generate no further read_event/write_buffer_space_avail/socket_disconnected calls for the
 205 /// descriptor.
 206 #[derive(Clone)]
 207 pub struct PeerHandleError {
 208         /// Used to indicate that we probably can't make any future connections to this peer, implying
 209         /// we should go ahead and force-close any channels we have with it.
 210         pub no_connection_possible: bool,
 211 }
 212 impl fmt::Debug for PeerHandleError {
 213         fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
 214                 formatter.write_str("Peer Sent Invalid Data")
 215         }
 216 }
 217 impl fmt::Display for PeerHandleError {
 218         fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
 219                 formatter.write_str("Peer Sent Invalid Data")
 220         }
 221 }
 222 impl error::Error for PeerHandleError {
 223         fn description(&self) -> &str {
 224                 "Peer Sent Invalid Data"
 225         }
 226 }
 227
 228 enum InitSyncTracker{
 229         NoSyncRequested,
 230         ChannelsSyncing(u64),
 231         NodesSyncing(PublicKey),
 232 }
 233
 234 struct Peer {
 235         channel_encryptor: PeerChannelEncryptor,
 236         their_node_id: Option<PublicKey>,
 237         their_features: Option<InitFeatures>,
 238
 239         pending_outbound_buffer: LinkedList<Vec<u8>>,
 240         pending_outbound_buffer_first_msg_offset: usize,
 241         awaiting_write_event: bool,
 242
 243         pending_read_buffer: Vec<u8>,
 244         pending_read_buffer_pos: usize,
 245         pending_read_is_header: bool,
 246
 247         sync_status: InitSyncTracker,
 248
 249         awaiting_pong: bool,
 250 }
 251
 252 impl Peer {
 253         /// Returns true if the channel announcements/updates for the given channel should be
 254         /// forwarded to this peer.
 255         /// If we are sending our routing table to this peer and we have not yet sent channel
 256         /// announcements/updates for the given channel_id then we will send it when we get to that
 257         /// point and we shouldn't send it yet to avoid sending duplicate updates. If we've already
 258         /// sent the old versions, we should send the update, and so return true here.
 259         fn should_forward_channel_announcement(&self, channel_id: u64)->bool{
 260                 match self.sync_status {
 261                         InitSyncTracker::NoSyncRequested => true,
 262                         InitSyncTracker::ChannelsSyncing(i) => i < channel_id,
 263                         InitSyncTracker::NodesSyncing(_) => true,
 264                 }
 265         }
 266
 267         /// Similar to the above, but for node announcements indexed by node_id.
 268         fn should_forward_node_announcement(&self, node_id: PublicKey) -> bool {
 269                 match self.sync_status {
 270                         InitSyncTracker::NoSyncRequested => true,
 271                         InitSyncTracker::ChannelsSyncing(_) => false,
 272                         InitSyncTracker::NodesSyncing(pk) => pk < node_id,
 273                 }
 274         }
 275 }
 276
 277 struct PeerHolder<Descriptor: SocketDescriptor> {
 278         peers: HashMap<Descriptor, Peer>,
 279         /// Added to by do_read_event for cases where we pushed a message onto the send buffer but
 280         /// didn't call do_attempt_write_data to avoid reentrancy. Cleared in process_events()
 281         peers_needing_send: HashSet<Descriptor>,
 282         /// Only add to this set when noise completes:
 283         node_id_to_descriptor: HashMap<PublicKey, Descriptor>,
 284 }
 285
 286 #[cfg(not(any(target_pointer_width = "32", target_pointer_width = "64")))]
 287 fn _check_usize_is_32_or_64() {
 288         // See below, less than 32 bit pointers may be unsafe here!
 289         unsafe { mem::transmute::<*const usize, [u8; 4]>(panic!()); }
 290 }
 291
 292 /// SimpleArcPeerManager is useful when you need a PeerManager with a static lifetime, e.g.
 293 /// when you're using lightning-net-tokio (since tokio::spawn requires parameters with static
 294 /// lifetimes). Other times you can afford a reference, which is more efficient, in which case
 295 /// SimpleRefPeerManager is the more appropriate type. Defining these type aliases prevents
 296 /// issues such as overly long function definitions.
 297 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>>;
 298
 299 /// SimpleRefPeerManager is a type alias for a PeerManager reference, and is the reference
 300 /// counterpart to the SimpleArcPeerManager type alias. Use this type by default when you don't
 301 /// need a PeerManager with a static lifetime. You'll need a static lifetime in cases such as
 302 /// usage of lightning-net-tokio (since tokio::spawn requires parameters with static lifetimes).
 303 /// But if this is not necessary, using a reference is more efficient. Defining these type aliases
 304 /// helps with issues such as long function definitions.
 305 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>;
 306
 307 /// A PeerManager manages a set of peers, described by their SocketDescriptor and marshalls socket
 308 /// events into messages which it passes on to its MessageHandlers.
 309 ///
 310 /// Rather than using a plain PeerManager, it is preferable to use either a SimpleArcPeerManager
 311 /// a SimpleRefPeerManager, for conciseness. See their documentation for more details, but
 312 /// essentially you should default to using a SimpleRefPeerManager, and use a
 313 /// SimpleArcPeerManager when you require a PeerManager with a static lifetime, such as when
 314 /// you're using lightning-net-tokio.
 315 pub struct PeerManager<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, L: Deref> where
 316                 CM::Target: ChannelMessageHandler,
 317                 RM::Target: RoutingMessageHandler,
 318                 L::Target: Logger {
 319         message_handler: MessageHandler<CM, RM>,
 320         peers: Mutex<PeerHolder<Descriptor>>,
 321         our_node_secret: SecretKey,
 322         ephemeral_key_midstate: Sha256Engine,
 323
 324         // Usize needs to be at least 32 bits to avoid overflowing both low and high. If usize is 64
 325         // bits we will never realistically count into high:
 326         peer_counter_low: AtomicUsize,
 327         peer_counter_high: AtomicUsize,
 328
 329         logger: L,
 330 }
 331
 332 enum MessageHandlingError {
 333         PeerHandleError(PeerHandleError),
 334         LightningError(LightningError),
 335 }
 336
 337 impl From<PeerHandleError> for MessageHandlingError {
 338         fn from(error: PeerHandleError) -> Self {
 339                 MessageHandlingError::PeerHandleError(error)
 340         }
 341 }
 342
 343 impl From<LightningError> for MessageHandlingError {
 344         fn from(error: LightningError) -> Self {
 345                 MessageHandlingError::LightningError(error)
 346         }
 347 }
 348
 349 macro_rules! encode_msg {
 350         ($msg: expr) => {{
 351                 let mut buffer = VecWriter(Vec::new());
 352                 wire::write($msg, &mut buffer).unwrap();
 353                 buffer.0
 354         }}
 355 }
 356
 357 impl<Descriptor: SocketDescriptor, CM: Deref, L: Deref> PeerManager<Descriptor, CM, IgnoringMessageHandler, L> where
 358                 CM::Target: ChannelMessageHandler,
 359                 L::Target: Logger {
 360         /// Constructs a new PeerManager with the given ChannelMessageHandler. No routing message
 361         /// handler is used and network graph messages are ignored.
 362         ///
 363         /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
 364         /// cryptographically secure random bytes.
 365         ///
 366         /// (C-not exported) as we can't export a PeerManager with a dummy route handler
 367         pub fn new_channel_only(channel_message_handler: CM, our_node_secret: SecretKey, ephemeral_random_data: &[u8; 32], logger: L) -> Self {
 368                 Self::new(MessageHandler {
 369                         chan_handler: channel_message_handler,
 370                         route_handler: IgnoringMessageHandler{},
 371                 }, our_node_secret, ephemeral_random_data, logger)
 372         }
 373 }
 374
 375 impl<Descriptor: SocketDescriptor, RM: Deref, L: Deref> PeerManager<Descriptor, ErroringMessageHandler, RM, L> where
 376                 RM::Target: RoutingMessageHandler,
 377                 L::Target: Logger {
 378         /// Constructs a new PeerManager with the given RoutingMessageHandler. No channel message
 379         /// handler is used and messages related to channels will be ignored (or generate error
 380         /// messages). Note that some other lightning implementations time-out connections after some
 381         /// time if no channel is built with the peer.
 382         ///
 383         /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
 384         /// cryptographically secure random bytes.
 385         ///
 386         /// (C-not exported) as we can't export a PeerManager with a dummy channel handler
 387         pub fn new_routing_only(routing_message_handler: RM, our_node_secret: SecretKey, ephemeral_random_data: &[u8; 32], logger: L) -> Self {
 388                 Self::new(MessageHandler {
 389                         chan_handler: ErroringMessageHandler::new(),
 390                         route_handler: routing_message_handler,
 391                 }, our_node_secret, ephemeral_random_data, logger)
 392         }
 393 }
 394
 395 /// Manages and reacts to connection events. You probably want to use file descriptors as PeerIds.
 396 /// PeerIds may repeat, but only after socket_disconnected() has been called.
 397 impl<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, L: Deref> PeerManager<Descriptor, CM, RM, L> where
 398                 CM::Target: ChannelMessageHandler,
 399                 RM::Target: RoutingMessageHandler,
 400                 L::Target: Logger {
 401         /// Constructs a new PeerManager with the given message handlers and node_id secret key
 402         /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
 403         /// cryptographically secure random bytes.
 404         pub fn new(message_handler: MessageHandler<CM, RM>, our_node_secret: SecretKey, ephemeral_random_data: &[u8; 32], logger: L) -> Self {
 405                 let mut ephemeral_key_midstate = Sha256::engine();
 406                 ephemeral_key_midstate.input(ephemeral_random_data);
 407
 408                 PeerManager {
 409                         message_handler,
 410                         peers: Mutex::new(PeerHolder {
 411                                 peers: HashMap::new(),
 412                                 peers_needing_send: HashSet::new(),
 413                                 node_id_to_descriptor: HashMap::new()
 414                         }),
 415                         our_node_secret,
 416                         ephemeral_key_midstate,
 417                         peer_counter_low: AtomicUsize::new(0),
 418                         peer_counter_high: AtomicUsize::new(0),
 419                         logger,
 420                 }
 421         }
 422
 423         /// Get the list of node ids for peers which have completed the initial handshake.
 424         ///
 425         /// For outbound connections, this will be the same as the their_node_id parameter passed in to
 426         /// new_outbound_connection, however entries will only appear once the initial handshake has
 427         /// completed and we are sure the remote peer has the private key for the given node_id.
 428         pub fn get_peer_node_ids(&self) -> Vec<PublicKey> {
 429                 let peers = self.peers.lock().unwrap();
 430                 peers.peers.values().filter_map(|p| {
 431                         if !p.channel_encryptor.is_ready_for_encryption() || p.their_features.is_none() {
 432                                 return None;
 433                         }
 434                         p.their_node_id
 435                 }).collect()
 436         }
 437
 438         fn get_ephemeral_key(&self) -> SecretKey {
 439                 let mut ephemeral_hash = self.ephemeral_key_midstate.clone();
 440                 let low = self.peer_counter_low.fetch_add(1, Ordering::AcqRel);
 441                 let high = if low == 0 {
 442                         self.peer_counter_high.fetch_add(1, Ordering::AcqRel)
 443                 } else {
 444                         self.peer_counter_high.load(Ordering::Acquire)
 445                 };
 446                 ephemeral_hash.input(&byte_utils::le64_to_array(low as u64));
 447                 ephemeral_hash.input(&byte_utils::le64_to_array(high as u64));
 448                 SecretKey::from_slice(&Sha256::from_engine(ephemeral_hash).into_inner()).expect("You broke SHA-256!")
 449         }
 450
 451         /// Indicates a new outbound connection has been established to a node with the given node_id.
 452         /// Note that if an Err is returned here you MUST NOT call socket_disconnected for the new
 453         /// descriptor but must disconnect the connection immediately.
 454         ///
 455         /// Returns a small number of bytes to send to the remote node (currently always 50).
 456         ///
 457         /// Panics if descriptor is duplicative with some other descriptor which has not yet had a
 458         /// socket_disconnected().
 459         pub fn new_outbound_connection(&self, their_node_id: PublicKey, descriptor: Descriptor) -> Result<Vec<u8>, PeerHandleError> {
 460                 let mut peer_encryptor = PeerChannelEncryptor::new_outbound(their_node_id.clone(), self.get_ephemeral_key());
 461                 let res = peer_encryptor.get_act_one().to_vec();
 462                 let pending_read_buffer = [0; 50].to_vec(); // Noise act two is 50 bytes
 463
 464                 let mut peers = self.peers.lock().unwrap();
 465                 if peers.peers.insert(descriptor, Peer {
 466                         channel_encryptor: peer_encryptor,
 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                         their_node_id: None,
 504                         their_features: None,
 505
 506                         pending_outbound_buffer: LinkedList::new(),
 507                         pending_outbound_buffer_first_msg_offset: 0,
 508                         awaiting_write_event: false,
 509
 510                         pending_read_buffer,
 511                         pending_read_buffer_pos: 0,
 512                         pending_read_is_header: false,
 513
 514                         sync_status: InitSyncTracker::NoSyncRequested,
 515
 516                         awaiting_pong: false,
 517                 }).is_some() {
 518                         panic!("PeerManager driver duplicated descriptors!");
 519                 };
 520                 Ok(())
 521         }
 522
 523         fn do_attempt_write_data(&self, descriptor: &mut Descriptor, peer: &mut Peer) {
 524                 macro_rules! encode_and_send_msg {
 525                         ($msg: expr) => {
 526                                 {
 527                                         log_trace!(self.logger, "Encoding and sending sync update message of type {} to {}", $msg.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
 528                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!($msg)[..]));
 529                                 }
 530                         }
 531                 }
 532                 const MSG_BUFF_SIZE: usize = 10;
 533                 while !peer.awaiting_write_event {
 534                         if peer.pending_outbound_buffer.len() < MSG_BUFF_SIZE {
 535                                 match peer.sync_status {
 536                                         InitSyncTracker::NoSyncRequested => {},
 537                                         InitSyncTracker::ChannelsSyncing(c) if c < 0xffff_ffff_ffff_ffff => {
 538                                                 let steps = ((MSG_BUFF_SIZE - peer.pending_outbound_buffer.len() + 2) / 3) as u8;
 539                                                 let all_messages = self.message_handler.route_handler.get_next_channel_announcements(c, steps);
 540                                                 for &(ref announce, ref update_a_option, ref update_b_option) in all_messages.iter() {
 541                                                         encode_and_send_msg!(announce);
 542                                                         if let &Some(ref update_a) = update_a_option {
 543                                                                 encode_and_send_msg!(update_a);
 544                                                         }
 545                                                         if let &Some(ref update_b) = update_b_option {
 546                                                                 encode_and_send_msg!(update_b);
 547                                                         }
 548                                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(announce.contents.short_channel_id + 1);
 549                                                 }
 550                                                 if all_messages.is_empty() || all_messages.len() != steps as usize {
 551                                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(0xffff_ffff_ffff_ffff);
 552                                                 }
 553                                         },
 554                                         InitSyncTracker::ChannelsSyncing(c) if c == 0xffff_ffff_ffff_ffff => {
 555                                                 let steps = (MSG_BUFF_SIZE - peer.pending_outbound_buffer.len()) as u8;
 556                                                 let all_messages = self.message_handler.route_handler.get_next_node_announcements(None, steps);
 557                                                 for msg in all_messages.iter() {
 558                                                         encode_and_send_msg!(msg);
 559                                                         peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
 560                                                 }
 561                                                 if all_messages.is_empty() || all_messages.len() != steps as usize {
 562                                                         peer.sync_status = InitSyncTracker::NoSyncRequested;
 563                                                 }
 564                                         },
 565                                         InitSyncTracker::ChannelsSyncing(_) => unreachable!(),
 566                                         InitSyncTracker::NodesSyncing(key) => {
 567                                                 let steps = (MSG_BUFF_SIZE - peer.pending_outbound_buffer.len()) as u8;
 568                                                 let all_messages = self.message_handler.route_handler.get_next_node_announcements(Some(&key), steps);
 569                                                 for msg in all_messages.iter() {
 570                                                         encode_and_send_msg!(msg);
 571                                                         peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
 572                                                 }
 573                                                 if all_messages.is_empty() || all_messages.len() != steps as usize {
 574                                                         peer.sync_status = InitSyncTracker::NoSyncRequested;
 575                                                 }
 576                                         },
 577                                 }
 578                         }
 579
 580                         if {
 581                                 let next_buff = match peer.pending_outbound_buffer.front() {
 582                                         None => return,
 583                                         Some(buff) => buff,
 584                                 };
 585
 586                                 let should_be_reading = peer.pending_outbound_buffer.len() < MSG_BUFF_SIZE;
 587                                 let pending = &next_buff[peer.pending_outbound_buffer_first_msg_offset..];
 588                                 let data_sent = descriptor.send_data(pending, should_be_reading);
 589                                 peer.pending_outbound_buffer_first_msg_offset += data_sent;
 590                                 if peer.pending_outbound_buffer_first_msg_offset == next_buff.len() { true } else { false }
 591                         } {
 592                                 peer.pending_outbound_buffer_first_msg_offset = 0;
 593                                 peer.pending_outbound_buffer.pop_front();
 594                         } else {
 595                                 peer.awaiting_write_event = true;
 596                         }
 597                 }
 598         }
 599
 600         /// Indicates that there is room to write data to the given socket descriptor.
 601         ///
 602         /// May return an Err to indicate that the connection should be closed.
 603         ///
 604         /// Will most likely call send_data on the descriptor passed in (or the descriptor handed into
 605         /// new_*\_connection) before returning. Thus, be very careful with reentrancy issues! The
 606         /// invariants around calling write_buffer_space_avail in case a write did not fully complete
 607         /// must still hold - be ready to call write_buffer_space_avail again if a write call generated
 608         /// here isn't sufficient! Panics if the descriptor was not previously registered in a
 609         /// new_\*_connection event.
 610         pub fn write_buffer_space_avail(&self, descriptor: &mut Descriptor) -> Result<(), PeerHandleError> {
 611                 let mut peers = self.peers.lock().unwrap();
 612                 match peers.peers.get_mut(descriptor) {
 613                         None => panic!("Descriptor for write_event is not already known to PeerManager"),
 614                         Some(peer) => {
 615                                 peer.awaiting_write_event = false;
 616                                 self.do_attempt_write_data(descriptor, peer);
 617                         }
 618                 };
 619                 Ok(())
 620         }
 621
 622         /// Indicates that data was read from the given socket descriptor.
 623         ///
 624         /// May return an Err to indicate that the connection should be closed.
 625         ///
 626         /// Will *not* call back into send_data on any descriptors to avoid reentrancy complexity.
 627         /// Thus, however, you almost certainly want to call process_events() after any read_event to
 628         /// generate send_data calls to handle responses.
 629         ///
 630         /// If Ok(true) is returned, further read_events should not be triggered until a send_data call
 631         /// on this file descriptor has resume_read set (preventing DoS issues in the send buffer).
 632         ///
 633         /// Panics if the descriptor was not previously registered in a new_*_connection event.
 634         pub fn read_event(&self, peer_descriptor: &mut Descriptor, data: &[u8]) -> Result<bool, PeerHandleError> {
 635                 match self.do_read_event(peer_descriptor, data) {
 636                         Ok(res) => Ok(res),
 637                         Err(e) => {
 638                                 self.disconnect_event_internal(peer_descriptor, e.no_connection_possible);
 639                                 Err(e)
 640                         }
 641                 }
 642         }
 643
 644         /// Append a message to a peer's pending outbound/write buffer, and update the map of peers needing sends accordingly.
 645         fn enqueue_message<M: Encode + Writeable>(&self, peers_needing_send: &mut HashSet<Descriptor>, peer: &mut Peer, descriptor: Descriptor, message: &M) {
 646                 let mut buffer = VecWriter(Vec::new());
 647                 wire::write(message, &mut buffer).unwrap(); // crash if the write failed
 648                 let encoded_message = buffer.0;
 649
 650                 log_trace!(self.logger, "Enqueueing message of type {} to {}", message.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
 651                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_message[..]));
 652                 peers_needing_send.insert(descriptor);
 653         }
 654
 655         fn do_read_event(&self, peer_descriptor: &mut Descriptor, data: &[u8]) -> Result<bool, PeerHandleError> {
 656                 let pause_read = {
 657                         let mut peers_lock = self.peers.lock().unwrap();
 658                         let peers = &mut *peers_lock;
 659                         let pause_read = match peers.peers.get_mut(peer_descriptor) {
 660                                 None => panic!("Descriptor for read_event is not already known to PeerManager"),
 661                                 Some(peer) => {
 662                                         assert!(peer.pending_read_buffer.len() > 0);
 663                                         assert!(peer.pending_read_buffer.len() > peer.pending_read_buffer_pos);
 664
 665                                         let mut read_pos = 0;
 666                                         while read_pos < data.len() {
 667                                                 {
 668                                                         let data_to_copy = cmp::min(peer.pending_read_buffer.len() - peer.pending_read_buffer_pos, data.len() - read_pos);
 669                                                         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]);
 670                                                         read_pos += data_to_copy;
 671                                                         peer.pending_read_buffer_pos += data_to_copy;
 672                                                 }
 673
 674                                                 if peer.pending_read_buffer_pos == peer.pending_read_buffer.len() {
 675                                                         peer.pending_read_buffer_pos = 0;
 676
 677                                                         macro_rules! try_potential_handleerror {
 678                                                                 ($thing: expr) => {
 679                                                                         match $thing {
 680                                                                                 Ok(x) => x,
 681                                                                                 Err(e) => {
 682                                                                                         match e.action {
 683                                                                                                 msgs::ErrorAction::DisconnectPeer { msg: _ } => {
 684                                                                                                         //TODO: Try to push msg
 685                                                                                                         log_trace!(self.logger, "Got Err handling message, disconnecting peer because {}", e.err);
 686                                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 687                                                                                                 },
 688                                                                                                 msgs::ErrorAction::IgnoreError => {
 689                                                                                                         log_trace!(self.logger, "Got Err handling message, ignoring because {}", e.err);
 690                                                                                                         continue;
 691                                                                                                 },
 692                                                                                                 msgs::ErrorAction::SendErrorMessage { msg } => {
 693                                                                                                         log_trace!(self.logger, "Got Err handling message, sending Error message because {}", e.err);
 694                                                                                                         self.enqueue_message(&mut peers.peers_needing_send, peer, peer_descriptor.clone(), &msg);
 695                                                                                                         continue;
 696                                                                                                 },
 697                                                                                         }
 698                                                                                 }
 699                                                                         };
 700                                                                 }
 701                                                         }
 702
 703                                                         macro_rules! insert_node_id {
 704                                                                 () => {
 705                                                                         match peers.node_id_to_descriptor.entry(peer.their_node_id.unwrap()) {
 706                                                                                 hash_map::Entry::Occupied(_) => {
 707                                                                                         log_trace!(self.logger, "Got second connection with {}, closing", log_pubkey!(peer.their_node_id.unwrap()));
 708                                                                                         peer.their_node_id = None; // Unset so that we don't generate a peer_disconnected event
 709                                                                                         return Err(PeerHandleError{ no_connection_possible: false })
 710                                                                                 },
 711                                                                                 hash_map::Entry::Vacant(entry) => {
 712                                                                                         log_trace!(self.logger, "Finished noise handshake for connection with {}", log_pubkey!(peer.their_node_id.unwrap()));
 713                                                                                         entry.insert(peer_descriptor.clone())
 714                                                                                 },
 715                                                                         };
 716                                                                 }
 717                                                         }
 718
 719                                                         let next_step = peer.channel_encryptor.get_noise_step();
 720                                                         match next_step {
 721                                                                 NextNoiseStep::ActOne => {
 722                                                                         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();
 723                                                                         peer.pending_outbound_buffer.push_back(act_two);
 724                                                                         peer.pending_read_buffer = [0; 66].to_vec(); // act three is 66 bytes long
 725                                                                 },
 726                                                                 NextNoiseStep::ActTwo => {
 727                                                                         let (act_three, their_node_id) = try_potential_handleerror!(peer.channel_encryptor.process_act_two(&peer.pending_read_buffer[..], &self.our_node_secret));
 728                                                                         peer.pending_outbound_buffer.push_back(act_three.to_vec());
 729                                                                         peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
 730                                                                         peer.pending_read_is_header = true;
 731
 732                                                                         peer.their_node_id = Some(their_node_id);
 733                                                                         insert_node_id!();
 734                                                                         let features = InitFeatures::known();
 735                                                                         let resp = msgs::Init { features };
 736                                                                         self.enqueue_message(&mut peers.peers_needing_send, peer, peer_descriptor.clone(), &resp);
 737                                                                 },
 738                                                                 NextNoiseStep::ActThree => {
 739                                                                         let their_node_id = try_potential_handleerror!(peer.channel_encryptor.process_act_three(&peer.pending_read_buffer[..]));
 740                                                                         peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
 741                                                                         peer.pending_read_is_header = true;
 742                                                                         peer.their_node_id = Some(their_node_id);
 743                                                                         insert_node_id!();
 744                                                                         let features = InitFeatures::known();
 745                                                                         let resp = msgs::Init { features };
 746                                                                         self.enqueue_message(&mut peers.peers_needing_send, peer, peer_descriptor.clone(), &resp);
 747                                                                 },
 748                                                                 NextNoiseStep::NoiseComplete => {
 749                                                                         if peer.pending_read_is_header {
 750                                                                                 let msg_len = try_potential_handleerror!(peer.channel_encryptor.decrypt_length_header(&peer.pending_read_buffer[..]));
 751                                                                                 peer.pending_read_buffer = Vec::with_capacity(msg_len as usize + 16);
 752                                                                                 peer.pending_read_buffer.resize(msg_len as usize + 16, 0);
 753                                                                                 if msg_len < 2 { // Need at least the message type tag
 754                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 755                                                                                 }
 756                                                                                 peer.pending_read_is_header = false;
 757                                                                         } else {
 758                                                                                 let msg_data = try_potential_handleerror!(peer.channel_encryptor.decrypt_message(&peer.pending_read_buffer[..]));
 759                                                                                 assert!(msg_data.len() >= 2);
 760
 761                                                                                 // Reset read buffer
 762                                                                                 peer.pending_read_buffer = [0; 18].to_vec();
 763                                                                                 peer.pending_read_is_header = true;
 764
 765                                                                                 let mut reader = ::std::io::Cursor::new(&msg_data[..]);
 766                                                                                 let message_result = wire::read(&mut reader);
 767                                                                                 let message = match message_result {
 768                                                                                         Ok(x) => x,
 769                                                                                         Err(e) => {
 770                                                                                                 match e {
 771                                                                                                         msgs::DecodeError::UnknownVersion => return Err(PeerHandleError { no_connection_possible: false }),
 772                                                                                                         msgs::DecodeError::UnknownRequiredFeature => {
 773                                                                                                                 log_debug!(self.logger, "Got a channel/node announcement with an known required feature flag, you may want to update!");
 774                                                                                                                 continue;
 775                                                                                                         }
 776                                                                                                         msgs::DecodeError::InvalidValue => {
 777                                                                                                                 log_debug!(self.logger, "Got an invalid value while deserializing message");
 778                                                                                                                 return Err(PeerHandleError { no_connection_possible: false });
 779                                                                                                         }
 780                                                                                                         msgs::DecodeError::ShortRead => {
 781                                                                                                                 log_debug!(self.logger, "Deserialization failed due to shortness of message");
 782                                                                                                                 return Err(PeerHandleError { no_connection_possible: false });
 783                                                                                                         }
 784                                                                                                         msgs::DecodeError::BadLengthDescriptor => return Err(PeerHandleError { no_connection_possible: false }),
 785                                                                                                         msgs::DecodeError::Io(_) => return Err(PeerHandleError { no_connection_possible: false }),
 786                                                                                                 }
 787                                                                                         }
 788                                                                                 };
 789
 790                                                                                 if let Err(handling_error) = self.handle_message(&mut peers.peers_needing_send, peer, peer_descriptor.clone(), message){
 791                                                                                         match handling_error {
 792                                                                                                 MessageHandlingError::PeerHandleError(e) => { return Err(e) },
 793                                                                                                 MessageHandlingError::LightningError(e) => {
 794                                                                                                         try_potential_handleerror!(Err(e));
 795                                                                                                 },
 796                                                                                         }
 797                                                                                 }
 798                                                                         }
 799                                                                 }
 800                                                         }
 801                                                 }
 802                                         }
 803
 804                                         self.do_attempt_write_data(peer_descriptor, peer);
 805
 806                                         peer.pending_outbound_buffer.len() > 10 // pause_read
 807                                 }
 808                         };
 809
 810                         pause_read
 811                 };
 812
 813                 Ok(pause_read)
 814         }
 815
 816         /// Process an incoming message and return a decision (ok, lightning error, peer handling error) regarding the next action with the peer
 817         fn handle_message(&self, peers_needing_send: &mut HashSet<Descriptor>, peer: &mut Peer, peer_descriptor: Descriptor, message: wire::Message) -> Result<(), MessageHandlingError> {
 818                 log_trace!(self.logger, "Received message of type {} from {}", message.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
 819
 820                 // Need an Init as first message
 821                 if let wire::Message::Init(_) = message {
 822                 } else if peer.their_features.is_none() {
 823                         log_trace!(self.logger, "Peer {} sent non-Init first message", log_pubkey!(peer.their_node_id.unwrap()));
 824                         return Err(PeerHandleError{ no_connection_possible: false }.into());
 825                 }
 826
 827                 match message {
 828                         // Setup and Control messages:
 829                         wire::Message::Init(msg) => {
 830                                 if msg.features.requires_unknown_bits() {
 831                                         log_info!(self.logger, "Peer features required unknown version bits");
 832                                         return Err(PeerHandleError{ no_connection_possible: true }.into());
 833                                 }
 834                                 if peer.their_features.is_some() {
 835                                         return Err(PeerHandleError{ no_connection_possible: false }.into());
 836                                 }
 837
 838                                 log_info!(
 839                                         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): {}",
 840                                         if msg.features.supports_data_loss_protect() { "supported" } else { "not supported"},
 841                                         if msg.features.initial_routing_sync() { "requested" } else { "not requested" },
 842                                         if msg.features.supports_upfront_shutdown_script() { "supported" } else { "not supported"},
 843                                         if msg.features.supports_gossip_queries() { "supported" } else { "not supported" },
 844                                         if msg.features.supports_static_remote_key() { "supported" } else { "not supported"},
 845                                         if msg.features.supports_unknown_bits() { "present" } else { "none" }
 846                                 );
 847
 848                                 if msg.features.initial_routing_sync() {
 849                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(0);
 850                                         peers_needing_send.insert(peer_descriptor.clone());
 851                                 }
 852                                 if !msg.features.supports_static_remote_key() {
 853                                         log_debug!(self.logger, "Peer {} does not support static remote key, disconnecting with no_connection_possible", log_pubkey!(peer.their_node_id.unwrap()));
 854                                         return Err(PeerHandleError{ no_connection_possible: true }.into());
 855                                 }
 856
 857                                 self.message_handler.route_handler.sync_routing_table(&peer.their_node_id.unwrap(), &msg);
 858
 859                                 self.message_handler.chan_handler.peer_connected(&peer.their_node_id.unwrap(), &msg);
 860                                 peer.their_features = Some(msg.features);
 861                         },
 862                         wire::Message::Error(msg) => {
 863                                 let mut data_is_printable = true;
 864                                 for b in msg.data.bytes() {
 865                                         if b < 32 || b > 126 {
 866                                                 data_is_printable = false;
 867                                                 break;
 868                                         }
 869                                 }
 870
 871                                 if data_is_printable {
 872                                         log_debug!(self.logger, "Got Err message from {}: {}", log_pubkey!(peer.their_node_id.unwrap()), msg.data);
 873                                 } else {
 874                                         log_debug!(self.logger, "Got Err message from {} with non-ASCII error message", log_pubkey!(peer.their_node_id.unwrap()));
 875                                 }
 876                                 self.message_handler.chan_handler.handle_error(&peer.their_node_id.unwrap(), &msg);
 877                                 if msg.channel_id == [0; 32] {
 878                                         return Err(PeerHandleError{ no_connection_possible: true }.into());
 879                                 }
 880                         },
 881
 882                         wire::Message::Ping(msg) => {
 883                                 if msg.ponglen < 65532 {
 884                                         let resp = msgs::Pong { byteslen: msg.ponglen };
 885                                         self.enqueue_message(peers_needing_send, peer, peer_descriptor.clone(), &resp);
 886                                 }
 887                         },
 888                         wire::Message::Pong(_msg) => {
 889                                 peer.awaiting_pong = false;
 890                         },
 891
 892                         // Channel messages:
 893                         wire::Message::OpenChannel(msg) => {
 894                                 self.message_handler.chan_handler.handle_open_channel(&peer.their_node_id.unwrap(), peer.their_features.clone().unwrap(), &msg);
 895                         },
 896                         wire::Message::AcceptChannel(msg) => {
 897                                 self.message_handler.chan_handler.handle_accept_channel(&peer.their_node_id.unwrap(), peer.their_features.clone().unwrap(), &msg);
 898                         },
 899
 900                         wire::Message::FundingCreated(msg) => {
 901                                 self.message_handler.chan_handler.handle_funding_created(&peer.their_node_id.unwrap(), &msg);
 902                         },
 903                         wire::Message::FundingSigned(msg) => {
 904                                 self.message_handler.chan_handler.handle_funding_signed(&peer.their_node_id.unwrap(), &msg);
 905                         },
 906                         wire::Message::FundingLocked(msg) => {
 907                                 self.message_handler.chan_handler.handle_funding_locked(&peer.their_node_id.unwrap(), &msg);
 908                         },
 909
 910                         wire::Message::Shutdown(msg) => {
 911                                 self.message_handler.chan_handler.handle_shutdown(&peer.their_node_id.unwrap(), peer.their_features.as_ref().unwrap(), &msg);
 912                         },
 913                         wire::Message::ClosingSigned(msg) => {
 914                                 self.message_handler.chan_handler.handle_closing_signed(&peer.their_node_id.unwrap(), &msg);
 915                         },
 916
 917                         // Commitment messages:
 918                         wire::Message::UpdateAddHTLC(msg) => {
 919                                 self.message_handler.chan_handler.handle_update_add_htlc(&peer.their_node_id.unwrap(), &msg);
 920                         },
 921                         wire::Message::UpdateFulfillHTLC(msg) => {
 922                                 self.message_handler.chan_handler.handle_update_fulfill_htlc(&peer.their_node_id.unwrap(), &msg);
 923                         },
 924                         wire::Message::UpdateFailHTLC(msg) => {
 925                                 self.message_handler.chan_handler.handle_update_fail_htlc(&peer.their_node_id.unwrap(), &msg);
 926                         },
 927                         wire::Message::UpdateFailMalformedHTLC(msg) => {
 928                                 self.message_handler.chan_handler.handle_update_fail_malformed_htlc(&peer.their_node_id.unwrap(), &msg);
 929                         },
 930
 931                         wire::Message::CommitmentSigned(msg) => {
 932                                 self.message_handler.chan_handler.handle_commitment_signed(&peer.their_node_id.unwrap(), &msg);
 933                         },
 934                         wire::Message::RevokeAndACK(msg) => {
 935                                 self.message_handler.chan_handler.handle_revoke_and_ack(&peer.their_node_id.unwrap(), &msg);
 936                         },
 937                         wire::Message::UpdateFee(msg) => {
 938                                 self.message_handler.chan_handler.handle_update_fee(&peer.their_node_id.unwrap(), &msg);
 939                         },
 940                         wire::Message::ChannelReestablish(msg) => {
 941                                 self.message_handler.chan_handler.handle_channel_reestablish(&peer.their_node_id.unwrap(), &msg);
 942                         },
 943
 944                         // Routing messages:
 945                         wire::Message::AnnouncementSignatures(msg) => {
 946                                 self.message_handler.chan_handler.handle_announcement_signatures(&peer.their_node_id.unwrap(), &msg);
 947                         },
 948                         wire::Message::ChannelAnnouncement(msg) => {
 949                                 let should_forward = match self.message_handler.route_handler.handle_channel_announcement(&msg) {
 950                                         Ok(v) => v,
 951                                         Err(e) => { return Err(e.into()); },
 952                                 };
 953
 954                                 if should_forward {
 955                                         // TODO: forward msg along to all our other peers!
 956                                 }
 957                         },
 958                         wire::Message::NodeAnnouncement(msg) => {
 959                                 let should_forward = match self.message_handler.route_handler.handle_node_announcement(&msg) {
 960                                         Ok(v) => v,
 961                                         Err(e) => { return Err(e.into()); },
 962                                 };
 963
 964                                 if should_forward {
 965                                         // TODO: forward msg along to all our other peers!
 966                                 }
 967                         },
 968                         wire::Message::ChannelUpdate(msg) => {
 969                                 self.message_handler.chan_handler.handle_channel_update(&peer.their_node_id.unwrap(), &msg);
 970                                 let should_forward = match self.message_handler.route_handler.handle_channel_update(&msg) {
 971                                         Ok(v) => v,
 972                                         Err(e) => { return Err(e.into()); },
 973                                 };
 974
 975                                 if should_forward {
 976                                         // TODO: forward msg along to all our other peers!
 977                                 }
 978                         },
 979                         wire::Message::QueryShortChannelIds(msg) => {
 980                                 self.message_handler.route_handler.handle_query_short_channel_ids(&peer.their_node_id.unwrap(), msg)?;
 981                         },
 982                         wire::Message::ReplyShortChannelIdsEnd(msg) => {
 983                                 self.message_handler.route_handler.handle_reply_short_channel_ids_end(&peer.their_node_id.unwrap(), msg)?;
 984                         },
 985                         wire::Message::QueryChannelRange(msg) => {
 986                                 self.message_handler.route_handler.handle_query_channel_range(&peer.their_node_id.unwrap(), msg)?;
 987                         },
 988                         wire::Message::ReplyChannelRange(msg) => {
 989                                 self.message_handler.route_handler.handle_reply_channel_range(&peer.their_node_id.unwrap(), msg)?;
 990                         },
 991                         wire::Message::GossipTimestampFilter(_msg) => {
 992                                 // TODO: handle message
 993                         },
 994
 995                         // Unknown messages:
 996                         wire::Message::Unknown(msg_type) if msg_type.is_even() => {
 997                                 log_debug!(self.logger, "Received unknown even message of type {}, disconnecting peer!", msg_type);
 998                                 // Fail the channel if message is an even, unknown type as per BOLT #1.
 999                                 return Err(PeerHandleError{ no_connection_possible: true }.into());
1000                         },
1001                         wire::Message::Unknown(msg_type) => {
1002                                 log_trace!(self.logger, "Received unknown odd message of type {}, ignoring", msg_type);
1003                         }
1004                 };
1005                 Ok(())
1006         }
1007
1008         /// Checks for any events generated by our handlers and processes them. Includes sending most
1009         /// response messages as well as messages generated by calls to handler functions directly (eg
1010         /// functions like ChannelManager::process_pending_htlc_forward or send_payment).
1011         pub fn process_events(&self) {
1012                 {
1013                         // TODO: There are some DoS attacks here where you can flood someone's outbound send
1014                         // buffer by doing things like announcing channels on another node. We should be willing to
1015                         // drop optional-ish messages when send buffers get full!
1016
1017                         let mut peers_lock = self.peers.lock().unwrap();
1018                         let mut events_generated = self.message_handler.chan_handler.get_and_clear_pending_msg_events();
1019                         events_generated.append(&mut self.message_handler.route_handler.get_and_clear_pending_msg_events());
1020                         let peers = &mut *peers_lock;
1021                         for event in events_generated.drain(..) {
1022                                 macro_rules! get_peer_for_forwarding {
1023                                         ($node_id: expr, $handle_no_such_peer: block) => {
1024                                                 {
1025                                                         let descriptor = match peers.node_id_to_descriptor.get($node_id) {
1026                                                                 Some(descriptor) => descriptor.clone(),
1027                                                                 None => {
1028                                                                         $handle_no_such_peer;
1029                                                                         continue;
1030                                                                 },
1031                                                         };
1032                                                         match peers.peers.get_mut(&descriptor) {
1033                                                                 Some(peer) => {
1034                                                                         if peer.their_features.is_none() {
1035                                                                                 $handle_no_such_peer;
1036                                                                                 continue;
1037                                                                         }
1038                                                                         (descriptor, peer)
1039                                                                 },
1040                                                                 None => panic!("Inconsistent peers set state!"),
1041                                                         }
1042                                                 }
1043                                         }
1044                                 }
1045                                 match event {
1046                                         MessageSendEvent::SendAcceptChannel { ref node_id, ref msg } => {
1047                                                 log_trace!(self.logger, "Handling SendAcceptChannel event in peer_handler for node {} for channel {}",
1048                                                                 log_pubkey!(node_id),
1049                                                                 log_bytes!(msg.temporary_channel_id));
1050                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1051                                                                 //TODO: Drop the pending channel? (or just let it timeout, but that sucks)
1052                                                         });
1053                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1054                                                 self.do_attempt_write_data(&mut descriptor, peer);
1055                                         },
1056                                         MessageSendEvent::SendOpenChannel { ref node_id, ref msg } => {
1057                                                 log_trace!(self.logger, "Handling SendOpenChannel event in peer_handler for node {} for channel {}",
1058                                                                 log_pubkey!(node_id),
1059                                                                 log_bytes!(msg.temporary_channel_id));
1060                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1061                                                                 //TODO: Drop the pending channel? (or just let it timeout, but that sucks)
1062                                                         });
1063                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1064                                                 self.do_attempt_write_data(&mut descriptor, peer);
1065                                         },
1066                                         MessageSendEvent::SendFundingCreated { ref node_id, ref msg } => {
1067                                                 log_trace!(self.logger, "Handling SendFundingCreated event in peer_handler for node {} for channel {} (which becomes {})",
1068                                                                 log_pubkey!(node_id),
1069                                                                 log_bytes!(msg.temporary_channel_id),
1070                                                                 log_funding_channel_id!(msg.funding_txid, msg.funding_output_index));
1071                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1072                                                                 //TODO: generate a DiscardFunding event indicating to the wallet that
1073                                                                 //they should just throw away this funding transaction
1074                                                         });
1075                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1076                                                 self.do_attempt_write_data(&mut descriptor, peer);
1077                                         },
1078                                         MessageSendEvent::SendFundingSigned { ref node_id, ref msg } => {
1079                                                 log_trace!(self.logger, "Handling SendFundingSigned event in peer_handler for node {} for channel {}",
1080                                                                 log_pubkey!(node_id),
1081                                                                 log_bytes!(msg.channel_id));
1082                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1083                                                                 //TODO: generate a DiscardFunding event indicating to the wallet that
1084                                                                 //they should just throw away this funding transaction
1085                                                         });
1086                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1087                                                 self.do_attempt_write_data(&mut descriptor, peer);
1088                                         },
1089                                         MessageSendEvent::SendFundingLocked { ref node_id, ref msg } => {
1090                                                 log_trace!(self.logger, "Handling SendFundingLocked event in peer_handler for node {} for channel {}",
1091                                                                 log_pubkey!(node_id),
1092                                                                 log_bytes!(msg.channel_id));
1093                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1094                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
1095                                                         });
1096                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1097                                                 self.do_attempt_write_data(&mut descriptor, peer);
1098                                         },
1099                                         MessageSendEvent::SendAnnouncementSignatures { ref node_id, ref msg } => {
1100                                                 log_trace!(self.logger, "Handling SendAnnouncementSignatures event in peer_handler for node {} for channel {})",
1101                                                                 log_pubkey!(node_id),
1102                                                                 log_bytes!(msg.channel_id));
1103                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1104                                                                 //TODO: generate a DiscardFunding event indicating to the wallet that
1105                                                                 //they should just throw away this funding transaction
1106                                                         });
1107                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1108                                                 self.do_attempt_write_data(&mut descriptor, peer);
1109                                         },
1110                                         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 } } => {
1111                                                 log_trace!(self.logger, "Handling UpdateHTLCs event in peer_handler for node {} with {} adds, {} fulfills, {} fails for channel {}",
1112                                                                 log_pubkey!(node_id),
1113                                                                 update_add_htlcs.len(),
1114                                                                 update_fulfill_htlcs.len(),
1115                                                                 update_fail_htlcs.len(),
1116                                                                 log_bytes!(commitment_signed.channel_id));
1117                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1118                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
1119                                                         });
1120                                                 for msg in update_add_htlcs {
1121                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1122                                                 }
1123                                                 for msg in update_fulfill_htlcs {
1124                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1125                                                 }
1126                                                 for msg in update_fail_htlcs {
1127                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1128                                                 }
1129                                                 for msg in update_fail_malformed_htlcs {
1130                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1131                                                 }
1132                                                 if let &Some(ref msg) = update_fee {
1133                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1134                                                 }
1135                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(commitment_signed)));
1136                                                 self.do_attempt_write_data(&mut descriptor, peer);
1137                                         },
1138                                         MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
1139                                                 log_trace!(self.logger, "Handling SendRevokeAndACK event in peer_handler for node {} for channel {}",
1140                                                                 log_pubkey!(node_id),
1141                                                                 log_bytes!(msg.channel_id));
1142                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1143                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
1144                                                         });
1145                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1146                                                 self.do_attempt_write_data(&mut descriptor, peer);
1147                                         },
1148                                         MessageSendEvent::SendClosingSigned { ref node_id, ref msg } => {
1149                                                 log_trace!(self.logger, "Handling SendClosingSigned event in peer_handler for node {} for channel {}",
1150                                                                 log_pubkey!(node_id),
1151                                                                 log_bytes!(msg.channel_id));
1152                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1153                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
1154                                                         });
1155                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1156                                                 self.do_attempt_write_data(&mut descriptor, peer);
1157                                         },
1158                                         MessageSendEvent::SendShutdown { ref node_id, ref msg } => {
1159                                                 log_trace!(self.logger, "Handling Shutdown event in peer_handler for node {} for channel {}",
1160                                                                 log_pubkey!(node_id),
1161                                                                 log_bytes!(msg.channel_id));
1162                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1163                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
1164                                                         });
1165                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1166                                                 self.do_attempt_write_data(&mut descriptor, peer);
1167                                         },
1168                                         MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
1169                                                 log_trace!(self.logger, "Handling SendChannelReestablish event in peer_handler for node {} for channel {}",
1170                                                                 log_pubkey!(node_id),
1171                                                                 log_bytes!(msg.channel_id));
1172                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1173                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
1174                                                         });
1175                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1176                                                 self.do_attempt_write_data(&mut descriptor, peer);
1177                                         },
1178                                         MessageSendEvent::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
1179                                                 log_trace!(self.logger, "Handling BroadcastChannelAnnouncement event in peer_handler for short channel id {}", msg.contents.short_channel_id);
1180                                                 if self.message_handler.route_handler.handle_channel_announcement(msg).is_ok() && self.message_handler.route_handler.handle_channel_update(update_msg).is_ok() {
1181                                                         let encoded_msg = encode_msg!(msg);
1182                                                         let encoded_update_msg = encode_msg!(update_msg);
1183
1184                                                         for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
1185                                                                 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1186                                                                                 !peer.should_forward_channel_announcement(msg.contents.short_channel_id) {
1187                                                                         continue
1188                                                                 }
1189                                                                 match peer.their_node_id {
1190                                                                         None => continue,
1191                                                                         Some(their_node_id) => {
1192                                                                                 if their_node_id == msg.contents.node_id_1 || their_node_id == msg.contents.node_id_2 {
1193                                                                                         continue
1194                                                                                 }
1195                                                                         }
1196                                                                 }
1197                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
1198                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_update_msg[..]));
1199                                                                 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
1200                                                         }
1201                                                 }
1202                                         },
1203                                         MessageSendEvent::BroadcastNodeAnnouncement { ref msg } => {
1204                                                 log_trace!(self.logger, "Handling BroadcastNodeAnnouncement event in peer_handler");
1205                                                 if self.message_handler.route_handler.handle_node_announcement(msg).is_ok() {
1206                                                         let encoded_msg = encode_msg!(msg);
1207
1208                                                         for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
1209                                                                 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1210                                                                                 !peer.should_forward_node_announcement(msg.contents.node_id) {
1211                                                                         continue
1212                                                                 }
1213                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
1214                                                                 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
1215                                                         }
1216                                                 }
1217                                         },
1218                                         MessageSendEvent::BroadcastChannelUpdate { ref msg } => {
1219                                                 log_trace!(self.logger, "Handling BroadcastChannelUpdate event in peer_handler for short channel id {}", msg.contents.short_channel_id);
1220                                                 if self.message_handler.route_handler.handle_channel_update(msg).is_ok() {
1221                                                         let encoded_msg = encode_msg!(msg);
1222
1223                                                         for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
1224                                                                 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1225                                                                                 !peer.should_forward_channel_announcement(msg.contents.short_channel_id)  {
1226                                                                         continue
1227                                                                 }
1228                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
1229                                                                 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
1230                                                         }
1231                                                 }
1232                                         },
1233                                         MessageSendEvent::PaymentFailureNetworkUpdate { ref update } => {
1234                                                 self.message_handler.route_handler.handle_htlc_fail_channel_update(update);
1235                                         },
1236                                         MessageSendEvent::HandleError { ref node_id, ref action } => {
1237                                                 match *action {
1238                                                         msgs::ErrorAction::DisconnectPeer { ref msg } => {
1239                                                                 if let Some(mut descriptor) = peers.node_id_to_descriptor.remove(node_id) {
1240                                                                         peers.peers_needing_send.remove(&descriptor);
1241                                                                         if let Some(mut peer) = peers.peers.remove(&descriptor) {
1242                                                                                 if let Some(ref msg) = *msg {
1243                                                                                         log_trace!(self.logger, "Handling DisconnectPeer HandleError event in peer_handler for node {} with message {}",
1244                                                                                                         log_pubkey!(node_id),
1245                                                                                                         msg.data);
1246                                                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1247                                                                                         // This isn't guaranteed to work, but if there is enough free
1248                                                                                         // room in the send buffer, put the error message there...
1249                                                                                         self.do_attempt_write_data(&mut descriptor, &mut peer);
1250                                                                                 } else {
1251                                                                                         log_trace!(self.logger, "Handling DisconnectPeer HandleError event in peer_handler for node {} with no message", log_pubkey!(node_id));
1252                                                                                 }
1253                                                                         }
1254                                                                         descriptor.disconnect_socket();
1255                                                                         self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1256                                                                 }
1257                                                         },
1258                                                         msgs::ErrorAction::IgnoreError => {},
1259                                                         msgs::ErrorAction::SendErrorMessage { ref msg } => {
1260                                                                 log_trace!(self.logger, "Handling SendErrorMessage HandleError event in peer_handler for node {} with message {}",
1261                                                                                 log_pubkey!(node_id),
1262                                                                                 msg.data);
1263                                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1264                                                                         //TODO: Do whatever we're gonna do for handling dropped messages
1265                                                                 });
1266                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1267                                                                 self.do_attempt_write_data(&mut descriptor, peer);
1268                                                         },
1269                                                 }
1270                                         },
1271                                         MessageSendEvent::SendChannelRangeQuery { ref node_id, ref msg } => {
1272                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {});
1273                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1274                                                 self.do_attempt_write_data(&mut descriptor, peer);
1275                                         },
1276                                         MessageSendEvent::SendShortIdsQuery { ref node_id, ref msg } => {
1277                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {});
1278                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1279                                                 self.do_attempt_write_data(&mut descriptor, peer);
1280                                         }
1281                                         MessageSendEvent::SendReplyChannelRange { ref node_id, ref msg } => {
1282                                                 log_trace!(self.logger, "Handling SendReplyChannelRange event in peer_handler for node {} with num_scids={} first_blocknum={} number_of_blocks={}, sync_complete={}",
1283                                                         log_pubkey!(node_id),
1284                                                         msg.short_channel_ids.len(),
1285                                                         msg.first_blocknum,
1286                                                         msg.number_of_blocks,
1287                                                         msg.sync_complete);
1288                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {});
1289                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1290                                                 self.do_attempt_write_data(&mut descriptor, peer);
1291                                         }
1292                                 }
1293                         }
1294
1295                         for mut descriptor in peers.peers_needing_send.drain() {
1296                                 match peers.peers.get_mut(&descriptor) {
1297                                         Some(peer) => self.do_attempt_write_data(&mut descriptor, peer),
1298                                         None => panic!("Inconsistent peers set state!"),
1299                                 }
1300                         }
1301                 }
1302         }
1303
1304         /// Indicates that the given socket descriptor's connection is now closed.
1305         ///
1306         /// This must only be called if the socket has been disconnected by the peer or your own
1307         /// decision to disconnect it and must NOT be called in any case where other parts of this
1308         /// library (eg PeerHandleError, explicit disconnect_socket calls) instruct you to disconnect
1309         /// the peer.
1310         ///
1311         /// Panics if the descriptor was not previously registered in a successful new_*_connection event.
1312         pub fn socket_disconnected(&self, descriptor: &Descriptor) {
1313                 self.disconnect_event_internal(descriptor, false);
1314         }
1315
1316         fn disconnect_event_internal(&self, descriptor: &Descriptor, no_connection_possible: bool) {
1317                 let mut peers = self.peers.lock().unwrap();
1318                 peers.peers_needing_send.remove(descriptor);
1319                 let peer_option = peers.peers.remove(descriptor);
1320                 match peer_option {
1321                         None => panic!("Descriptor for disconnect_event is not already known to PeerManager"),
1322                         Some(peer) => {
1323                                 match peer.their_node_id {
1324                                         Some(node_id) => {
1325                                                 peers.node_id_to_descriptor.remove(&node_id);
1326                                                 self.message_handler.chan_handler.peer_disconnected(&node_id, no_connection_possible);
1327                                         },
1328                                         None => {}
1329                                 }
1330                         }
1331                 };
1332         }
1333
1334         /// Disconnect a peer given its node id.
1335         ///
1336         /// Set no_connection_possible to true to prevent any further connection with this peer,
1337         /// force-closing any channels we have with it.
1338         ///
1339         /// If a peer is connected, this will call `disconnect_socket` on the descriptor for the peer,
1340         /// so be careful about reentrancy issues.
1341         pub fn disconnect_by_node_id(&self, node_id: PublicKey, no_connection_possible: bool) {
1342                 let mut peers_lock = self.peers.lock().unwrap();
1343                 if let Some(mut descriptor) = peers_lock.node_id_to_descriptor.remove(&node_id) {
1344                         log_trace!(self.logger, "Disconnecting peer with id {} due to client request", node_id);
1345                         peers_lock.peers.remove(&descriptor);
1346                         peers_lock.peers_needing_send.remove(&descriptor);
1347                         self.message_handler.chan_handler.peer_disconnected(&node_id, no_connection_possible);
1348                         descriptor.disconnect_socket();
1349                 }
1350         }
1351
1352         /// This function should be called roughly once every 30 seconds.
1353         /// It will send pings to each peer and disconnect those which did not respond to the last round of pings.
1354
1355         /// Will most likely call send_data on all of the registered descriptors, thus, be very careful with reentrancy issues!
1356         pub fn timer_tick_occurred(&self) {
1357                 let mut peers_lock = self.peers.lock().unwrap();
1358                 {
1359                         let peers = &mut *peers_lock;
1360                         let peers_needing_send = &mut peers.peers_needing_send;
1361                         let node_id_to_descriptor = &mut peers.node_id_to_descriptor;
1362                         let peers = &mut peers.peers;
1363                         let mut descriptors_needing_disconnect = Vec::new();
1364
1365                         peers.retain(|descriptor, peer| {
1366                                 if peer.awaiting_pong {
1367                                         peers_needing_send.remove(descriptor);
1368                                         descriptors_needing_disconnect.push(descriptor.clone());
1369                                         match peer.their_node_id {
1370                                                 Some(node_id) => {
1371                                                         log_trace!(self.logger, "Disconnecting peer with id {} due to ping timeout", node_id);
1372                                                         node_id_to_descriptor.remove(&node_id);
1373                                                         self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1374                                                 }
1375                                                 None => {
1376                                                         // This can't actually happen as we should have hit
1377                                                         // is_ready_for_encryption() previously on this same peer.
1378                                                         unreachable!();
1379                                                 },
1380                                         }
1381                                         return false;
1382                                 }
1383
1384                                 if !peer.channel_encryptor.is_ready_for_encryption() {
1385                                         // The peer needs to complete its handshake before we can exchange messages
1386                                         return true;
1387                                 }
1388
1389                                 let ping = msgs::Ping {
1390                                         ponglen: 0,
1391                                         byteslen: 64,
1392                                 };
1393                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(&ping)));
1394
1395                                 let mut descriptor_clone = descriptor.clone();
1396                                 self.do_attempt_write_data(&mut descriptor_clone, peer);
1397
1398                                 peer.awaiting_pong = true;
1399                                 true
1400                         });
1401
1402                         for mut descriptor in descriptors_needing_disconnect.drain(..) {
1403                                 descriptor.disconnect_socket();
1404                         }
1405                 }
1406         }
1407 }
1408
1409 #[cfg(test)]
1410 mod tests {
1411         use ln::peer_handler::{PeerManager, MessageHandler, SocketDescriptor};
1412         use ln::msgs;
1413         use util::events;
1414         use util::test_utils;
1415
1416         use bitcoin::secp256k1::Secp256k1;
1417         use bitcoin::secp256k1::key::{SecretKey, PublicKey};
1418
1419         use std;
1420         use std::sync::{Arc, Mutex};
1421         use std::sync::atomic::Ordering;
1422
1423         #[derive(Clone)]
1424         struct FileDescriptor {
1425                 fd: u16,
1426                 outbound_data: Arc<Mutex<Vec<u8>>>,
1427         }
1428         impl PartialEq for FileDescriptor {
1429                 fn eq(&self, other: &Self) -> bool {
1430                         self.fd == other.fd
1431                 }
1432         }
1433         impl Eq for FileDescriptor { }
1434         impl std::hash::Hash for FileDescriptor {
1435                 fn hash<H: std::hash::Hasher>(&self, hasher: &mut H) {
1436                         self.fd.hash(hasher)
1437                 }
1438         }
1439
1440         impl SocketDescriptor for FileDescriptor {
1441                 fn send_data(&mut self, data: &[u8], _resume_read: bool) -> usize {
1442                         self.outbound_data.lock().unwrap().extend_from_slice(data);
1443                         data.len()
1444                 }
1445
1446                 fn disconnect_socket(&mut self) {}
1447         }
1448
1449         struct PeerManagerCfg {
1450                 chan_handler: test_utils::TestChannelMessageHandler,
1451                 routing_handler: test_utils::TestRoutingMessageHandler,
1452                 logger: test_utils::TestLogger,
1453         }
1454
1455         fn create_peermgr_cfgs(peer_count: usize) -> Vec<PeerManagerCfg> {
1456                 let mut cfgs = Vec::new();
1457                 for _ in 0..peer_count {
1458                         cfgs.push(
1459                                 PeerManagerCfg{
1460                                         chan_handler: test_utils::TestChannelMessageHandler::new(),
1461                                         logger: test_utils::TestLogger::new(),
1462                                         routing_handler: test_utils::TestRoutingMessageHandler::new(),
1463                                 }
1464                         );
1465                 }
1466
1467                 cfgs
1468         }
1469
1470         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>> {
1471                 let mut peers = Vec::new();
1472                 for i in 0..peer_count {
1473                         let node_secret = SecretKey::from_slice(&[42 + i as u8; 32]).unwrap();
1474                         let ephemeral_bytes = [i as u8; 32];
1475                         let msg_handler = MessageHandler { chan_handler: &cfgs[i].chan_handler, route_handler: &cfgs[i].routing_handler };
1476                         let peer = PeerManager::new(msg_handler, node_secret, &ephemeral_bytes, &cfgs[i].logger);
1477                         peers.push(peer);
1478                 }
1479
1480                 peers
1481         }
1482
1483         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) {
1484                 let secp_ctx = Secp256k1::new();
1485                 let a_id = PublicKey::from_secret_key(&secp_ctx, &peer_a.our_node_secret);
1486                 let mut fd_a = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
1487                 let mut fd_b = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
1488                 let initial_data = peer_b.new_outbound_connection(a_id, fd_b.clone()).unwrap();
1489                 peer_a.new_inbound_connection(fd_a.clone()).unwrap();
1490                 assert_eq!(peer_a.read_event(&mut fd_a, &initial_data).unwrap(), false);
1491                 assert_eq!(peer_b.read_event(&mut fd_b, &fd_a.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1492                 assert_eq!(peer_a.read_event(&mut fd_a, &fd_b.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1493                 (fd_a.clone(), fd_b.clone())
1494         }
1495
1496         #[test]
1497         fn test_disconnect_peer() {
1498                 // Simple test which builds a network of PeerManager, connects and brings them to NoiseState::Finished and
1499                 // push a DisconnectPeer event to remove the node flagged by id
1500                 let cfgs = create_peermgr_cfgs(2);
1501                 let chan_handler = test_utils::TestChannelMessageHandler::new();
1502                 let mut peers = create_network(2, &cfgs);
1503                 establish_connection(&peers[0], &peers[1]);
1504                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1505
1506                 let secp_ctx = Secp256k1::new();
1507                 let their_id = PublicKey::from_secret_key(&secp_ctx, &peers[1].our_node_secret);
1508
1509                 chan_handler.pending_events.lock().unwrap().push(events::MessageSendEvent::HandleError {
1510                         node_id: their_id,
1511                         action: msgs::ErrorAction::DisconnectPeer { msg: None },
1512                 });
1513                 assert_eq!(chan_handler.pending_events.lock().unwrap().len(), 1);
1514                 peers[0].message_handler.chan_handler = &chan_handler;
1515
1516                 peers[0].process_events();
1517                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 0);
1518         }
1519
1520         #[test]
1521         fn test_timer_tick_occurred() {
1522                 // Create peers, a vector of two peer managers, perform initial set up and check that peers[0] has one Peer.
1523                 let cfgs = create_peermgr_cfgs(2);
1524                 let peers = create_network(2, &cfgs);
1525                 establish_connection(&peers[0], &peers[1]);
1526                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1527
1528                 // peers[0] awaiting_pong is set to true, but the Peer is still connected
1529                 peers[0].timer_tick_occurred();
1530                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1531
1532                 // Since timer_tick_occurred() is called again when awaiting_pong is true, all Peers are disconnected
1533                 peers[0].timer_tick_occurred();
1534                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 0);
1535         }
1536
1537         #[test]
1538         fn test_do_attempt_write_data() {
1539                 // Create 2 peers with custom TestRoutingMessageHandlers and connect them.
1540                 let cfgs = create_peermgr_cfgs(2);
1541                 cfgs[0].routing_handler.request_full_sync.store(true, Ordering::Release);
1542                 cfgs[1].routing_handler.request_full_sync.store(true, Ordering::Release);
1543                 let peers = create_network(2, &cfgs);
1544
1545                 // By calling establish_connect, we trigger do_attempt_write_data between
1546                 // the peers. Previously this function would mistakenly enter an infinite loop
1547                 // when there were more channel messages available than could fit into a peer's
1548                 // buffer. This issue would now be detected by this test (because we use custom
1549                 // RoutingMessageHandlers that intentionally return more channel messages
1550                 // than can fit into a peer's buffer).
1551                 let (mut fd_a, mut fd_b) = establish_connection(&peers[0], &peers[1]);
1552
1553                 // Make each peer to read the messages that the other peer just wrote to them.
1554                 peers[1].read_event(&mut fd_b, &fd_a.outbound_data.lock().unwrap().split_off(0)).unwrap();
1555                 peers[0].read_event(&mut fd_a, &fd_b.outbound_data.lock().unwrap().split_off(0)).unwrap();
1556
1557                 // Check that each peer has received the expected number of channel updates and channel
1558                 // announcements.
1559                 assert_eq!(cfgs[0].routing_handler.chan_upds_recvd.load(Ordering::Acquire), 100);
1560                 assert_eq!(cfgs[0].routing_handler.chan_anns_recvd.load(Ordering::Acquire), 50);
1561                 assert_eq!(cfgs[1].routing_handler.chan_upds_recvd.load(Ordering::Acquire), 100);
1562                 assert_eq!(cfgs[1].routing_handler.chan_anns_recvd.load(Ordering::Acquire), 50);
1563         }
1564 }