_ 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, NetAddress, RoutingMessageHandler};
  23 use ln::channelmanager::{SimpleArcChannelManager, SimpleRefChannelManager};
  24 use util::ser::{VecWriter, Writeable, Writer};
  25 use ln::peer_channel_encryptor::{PeerChannelEncryptor,NextNoiseStep};
  26 use ln::wire;
  27 use ln::wire::Encode;
  28 use util::atomic_counter::AtomicCounter;
  29 use util::events::{MessageSendEvent, MessageSendEventsProvider};
  30 use util::logger::Logger;
  31 use routing::network_graph::{NetworkGraph, NetGraphMsgHandler};
  32
  33 use prelude::*;
  34 use io;
  35 use alloc::collections::LinkedList;
  36 use sync::{Arc, Mutex, RwLock};
  37 use core::{cmp, hash, fmt, mem};
  38 use core::ops::Deref;
  39 use core::convert::Infallible;
  40 #[cfg(feature = "std")] use std::error;
  41
  42 use bitcoin::hashes::sha256::Hash as Sha256;
  43 use bitcoin::hashes::sha256::HashEngine as Sha256Engine;
  44 use bitcoin::hashes::{HashEngine, Hash};
  45
  46 /// Handler for BOLT1-compliant messages.
  47 pub trait CustomMessageHandler: wire::CustomMessageReader {
  48         /// Called with the message type that was received and the buffer to be read.
  49         /// Can return a `MessageHandlingError` if the message could not be handled.
  50         fn handle_custom_message(&self, msg: Self::CustomMessage, sender_node_id: &PublicKey) -> Result<(), LightningError>;
  51
  52         /// Gets the list of pending messages which were generated by the custom message
  53         /// handler, clearing the list in the process. The first tuple element must
  54         /// correspond to the intended recipients node ids. If no connection to one of the
  55         /// specified node does not exist, the message is simply not sent to it.
  56         fn get_and_clear_pending_msg(&self) -> Vec<(PublicKey, Self::CustomMessage)>;
  57 }
  58
  59 /// A dummy struct which implements `RoutingMessageHandler` without storing any routing information
  60 /// or doing any processing. You can provide one of these as the route_handler in a MessageHandler.
  61 pub struct IgnoringMessageHandler{}
  62 impl MessageSendEventsProvider for IgnoringMessageHandler {
  63         fn get_and_clear_pending_msg_events(&self) -> Vec<MessageSendEvent> { Vec::new() }
  64 }
  65 impl RoutingMessageHandler for IgnoringMessageHandler {
  66         fn handle_node_announcement(&self, _msg: &msgs::NodeAnnouncement) -> Result<bool, LightningError> { Ok(false) }
  67         fn handle_channel_announcement(&self, _msg: &msgs::ChannelAnnouncement) -> Result<bool, LightningError> { Ok(false) }
  68         fn handle_channel_update(&self, _msg: &msgs::ChannelUpdate) -> Result<bool, LightningError> { Ok(false) }
  69         fn get_next_channel_announcements(&self, _starting_point: u64, _batch_amount: u8) ->
  70                 Vec<(msgs::ChannelAnnouncement, Option<msgs::ChannelUpdate>, Option<msgs::ChannelUpdate>)> { Vec::new() }
  71         fn get_next_node_announcements(&self, _starting_point: Option<&PublicKey>, _batch_amount: u8) -> Vec<msgs::NodeAnnouncement> { Vec::new() }
  72         fn peer_connected(&self, _their_node_id: &PublicKey, _init: &msgs::Init) {}
  73         fn handle_reply_channel_range(&self, _their_node_id: &PublicKey, _msg: msgs::ReplyChannelRange) -> Result<(), LightningError> { Ok(()) }
  74         fn handle_reply_short_channel_ids_end(&self, _their_node_id: &PublicKey, _msg: msgs::ReplyShortChannelIdsEnd) -> Result<(), LightningError> { Ok(()) }
  75         fn handle_query_channel_range(&self, _their_node_id: &PublicKey, _msg: msgs::QueryChannelRange) -> Result<(), LightningError> { Ok(()) }
  76         fn handle_query_short_channel_ids(&self, _their_node_id: &PublicKey, _msg: msgs::QueryShortChannelIds) -> Result<(), LightningError> { Ok(()) }
  77 }
  78 impl Deref for IgnoringMessageHandler {
  79         type Target = IgnoringMessageHandler;
  80         fn deref(&self) -> &Self { self }
  81 }
  82
  83 // Implement Type for Infallible, note that it cannot be constructed, and thus you can never call a
  84 // method that takes self for it.
  85 impl wire::Type for Infallible {
  86         fn type_id(&self) -> u16 {
  87                 unreachable!();
  88         }
  89 }
  90 impl Writeable for Infallible {
  91         fn write<W: Writer>(&self, _: &mut W) -> Result<(), io::Error> {
  92                 unreachable!();
  93         }
  94 }
  95
  96 impl wire::CustomMessageReader for IgnoringMessageHandler {
  97         type CustomMessage = Infallible;
  98         fn read<R: io::Read>(&self, _message_type: u16, _buffer: &mut R) -> Result<Option<Self::CustomMessage>, msgs::DecodeError> {
  99                 Ok(None)
 100         }
 101 }
 102
 103 impl CustomMessageHandler for IgnoringMessageHandler {
 104         fn handle_custom_message(&self, _msg: Infallible, _sender_node_id: &PublicKey) -> Result<(), LightningError> {
 105                 // Since we always return `None` in the read the handle method should never be called.
 106                 unreachable!();
 107         }
 108
 109         fn get_and_clear_pending_msg(&self) -> Vec<(PublicKey, Self::CustomMessage)> { Vec::new() }
 110 }
 111
 112 /// A dummy struct which implements `ChannelMessageHandler` without having any channels.
 113 /// You can provide one of these as the route_handler in a MessageHandler.
 114 pub struct ErroringMessageHandler {
 115         message_queue: Mutex<Vec<MessageSendEvent>>
 116 }
 117 impl ErroringMessageHandler {
 118         /// Constructs a new ErroringMessageHandler
 119         pub fn new() -> Self {
 120                 Self { message_queue: Mutex::new(Vec::new()) }
 121         }
 122         fn push_error(&self, node_id: &PublicKey, channel_id: [u8; 32]) {
 123                 self.message_queue.lock().unwrap().push(MessageSendEvent::HandleError {
 124                         action: msgs::ErrorAction::SendErrorMessage {
 125                                 msg: msgs::ErrorMessage { channel_id, data: "We do not support channel messages, sorry.".to_owned() },
 126                         },
 127                         node_id: node_id.clone(),
 128                 });
 129         }
 130 }
 131 impl MessageSendEventsProvider for ErroringMessageHandler {
 132         fn get_and_clear_pending_msg_events(&self) -> Vec<MessageSendEvent> {
 133                 let mut res = Vec::new();
 134                 mem::swap(&mut res, &mut self.message_queue.lock().unwrap());
 135                 res
 136         }
 137 }
 138 impl ChannelMessageHandler for ErroringMessageHandler {
 139         // Any messages which are related to a specific channel generate an error message to let the
 140         // peer know we don't care about channels.
 141         fn handle_open_channel(&self, their_node_id: &PublicKey, _their_features: InitFeatures, msg: &msgs::OpenChannel) {
 142                 ErroringMessageHandler::push_error(self, their_node_id, msg.temporary_channel_id);
 143         }
 144         fn handle_accept_channel(&self, their_node_id: &PublicKey, _their_features: InitFeatures, msg: &msgs::AcceptChannel) {
 145                 ErroringMessageHandler::push_error(self, their_node_id, msg.temporary_channel_id);
 146         }
 147         fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) {
 148                 ErroringMessageHandler::push_error(self, their_node_id, msg.temporary_channel_id);
 149         }
 150         fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) {
 151                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 152         }
 153         fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &msgs::FundingLocked) {
 154                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 155         }
 156         fn handle_shutdown(&self, their_node_id: &PublicKey, _their_features: &InitFeatures, msg: &msgs::Shutdown) {
 157                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 158         }
 159         fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &msgs::ClosingSigned) {
 160                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 161         }
 162         fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) {
 163                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 164         }
 165         fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) {
 166                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 167         }
 168         fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) {
 169                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 170         }
 171         fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) {
 172                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 173         }
 174         fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) {
 175                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 176         }
 177         fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) {
 178                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 179         }
 180         fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) {
 181                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 182         }
 183         fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) {
 184                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 185         }
 186         fn handle_channel_reestablish(&self, their_node_id: &PublicKey, msg: &msgs::ChannelReestablish) {
 187                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 188         }
 189         // msgs::ChannelUpdate does not contain the channel_id field, so we just drop them.
 190         fn handle_channel_update(&self, _their_node_id: &PublicKey, _msg: &msgs::ChannelUpdate) {}
 191         fn peer_disconnected(&self, _their_node_id: &PublicKey, _no_connection_possible: bool) {}
 192         fn peer_connected(&self, _their_node_id: &PublicKey, _msg: &msgs::Init) {}
 193         fn handle_error(&self, _their_node_id: &PublicKey, _msg: &msgs::ErrorMessage) {}
 194 }
 195 impl Deref for ErroringMessageHandler {
 196         type Target = ErroringMessageHandler;
 197         fn deref(&self) -> &Self { self }
 198 }
 199
 200 /// Provides references to trait impls which handle different types of messages.
 201 pub struct MessageHandler<CM: Deref, RM: Deref> where
 202                 CM::Target: ChannelMessageHandler,
 203                 RM::Target: RoutingMessageHandler {
 204         /// A message handler which handles messages specific to channels. Usually this is just a
 205         /// [`ChannelManager`] object or an [`ErroringMessageHandler`].
 206         ///
 207         /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
 208         pub chan_handler: CM,
 209         /// A message handler which handles messages updating our knowledge of the network channel
 210         /// graph. Usually this is just a [`NetGraphMsgHandler`] object or an
 211         /// [`IgnoringMessageHandler`].
 212         ///
 213         /// [`NetGraphMsgHandler`]: crate::routing::network_graph::NetGraphMsgHandler
 214         pub route_handler: RM,
 215 }
 216
 217 /// Provides an object which can be used to send data to and which uniquely identifies a connection
 218 /// to a remote host. You will need to be able to generate multiple of these which meet Eq and
 219 /// implement Hash to meet the PeerManager API.
 220 ///
 221 /// For efficiency, Clone should be relatively cheap for this type.
 222 ///
 223 /// Two descriptors may compare equal (by [`cmp::Eq`] and [`hash::Hash`]) as long as the original
 224 /// has been disconnected, the [`PeerManager`] has been informed of the disconnection (either by it
 225 /// having triggered the disconnection or a call to [`PeerManager::socket_disconnected`]), and no
 226 /// further calls to the [`PeerManager`] related to the original socket occur. This allows you to
 227 /// use a file descriptor for your SocketDescriptor directly, however for simplicity you may wish
 228 /// to simply use another value which is guaranteed to be globally unique instead.
 229 pub trait SocketDescriptor : cmp::Eq + hash::Hash + Clone {
 230         /// Attempts to send some data from the given slice to the peer.
 231         ///
 232         /// Returns the amount of data which was sent, possibly 0 if the socket has since disconnected.
 233         /// Note that in the disconnected case, [`PeerManager::socket_disconnected`] must still be
 234         /// called and further write attempts may occur until that time.
 235         ///
 236         /// If the returned size is smaller than `data.len()`, a
 237         /// [`PeerManager::write_buffer_space_avail`] call must be made the next time more data can be
 238         /// written. Additionally, until a `send_data` event completes fully, no further
 239         /// [`PeerManager::read_event`] calls should be made for the same peer! Because this is to
 240         /// prevent denial-of-service issues, you should not read or buffer any data from the socket
 241         /// until then.
 242         ///
 243         /// If a [`PeerManager::read_event`] call on this descriptor had previously returned true
 244         /// (indicating that read events should be paused to prevent DoS in the send buffer),
 245         /// `resume_read` may be set indicating that read events on this descriptor should resume. A
 246         /// `resume_read` of false carries no meaning, and should not cause any action.
 247         fn send_data(&mut self, data: &[u8], resume_read: bool) -> usize;
 248         /// Disconnect the socket pointed to by this SocketDescriptor.
 249         ///
 250         /// You do *not* need to call [`PeerManager::socket_disconnected`] with this socket after this
 251         /// call (doing so is a noop).
 252         fn disconnect_socket(&mut self);
 253 }
 254
 255 /// Error for PeerManager errors. If you get one of these, you must disconnect the socket and
 256 /// generate no further read_event/write_buffer_space_avail/socket_disconnected calls for the
 257 /// descriptor.
 258 #[derive(Clone)]
 259 pub struct PeerHandleError {
 260         /// Used to indicate that we probably can't make any future connections to this peer, implying
 261         /// we should go ahead and force-close any channels we have with it.
 262         pub no_connection_possible: bool,
 263 }
 264 impl fmt::Debug for PeerHandleError {
 265         fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
 266                 formatter.write_str("Peer Sent Invalid Data")
 267         }
 268 }
 269 impl fmt::Display for PeerHandleError {
 270         fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
 271                 formatter.write_str("Peer Sent Invalid Data")
 272         }
 273 }
 274
 275 #[cfg(feature = "std")]
 276 impl error::Error for PeerHandleError {
 277         fn description(&self) -> &str {
 278                 "Peer Sent Invalid Data"
 279         }
 280 }
 281
 282 enum InitSyncTracker{
 283         NoSyncRequested,
 284         ChannelsSyncing(u64),
 285         NodesSyncing(PublicKey),
 286 }
 287
 288 /// The ratio between buffer sizes at which we stop sending initial sync messages vs when we stop
 289 /// forwarding gossip messages to peers altogether.
 290 const FORWARD_INIT_SYNC_BUFFER_LIMIT_RATIO: usize = 2;
 291
 292 /// When the outbound buffer has this many messages, we'll stop reading bytes from the peer until
 293 /// we have fewer than this many messages in the outbound buffer again.
 294 /// We also use this as the target number of outbound gossip messages to keep in the write buffer,
 295 /// refilled as we send bytes.
 296 const OUTBOUND_BUFFER_LIMIT_READ_PAUSE: usize = 10;
 297 /// When the outbound buffer has this many messages, we'll simply skip relaying gossip messages to
 298 /// the peer.
 299 const OUTBOUND_BUFFER_LIMIT_DROP_GOSSIP: usize = OUTBOUND_BUFFER_LIMIT_READ_PAUSE * FORWARD_INIT_SYNC_BUFFER_LIMIT_RATIO;
 300
 301 /// If we've sent a ping, and are still awaiting a response, we may need to churn our way through
 302 /// the socket receive buffer before receiving the ping.
 303 ///
 304 /// On a fairly old Arm64 board, with Linux defaults, this can take as long as 20 seconds, not
 305 /// including any network delays, outbound traffic, or the same for messages from other peers.
 306 ///
 307 /// Thus, to avoid needlessly disconnecting a peer, we allow a peer to take this many timer ticks
 308 /// per connected peer to respond to a ping, as long as they send us at least one message during
 309 /// each tick, ensuring we aren't actually just disconnected.
 310 /// With a timer tick interval of ten seconds, this translates to about 40 seconds per connected
 311 /// peer.
 312 ///
 313 /// When we improve parallelism somewhat we should reduce this to e.g. this many timer ticks per
 314 /// two connected peers, assuming most LDK-running systems have at least two cores.
 315 const MAX_BUFFER_DRAIN_TICK_INTERVALS_PER_PEER: i8 = 4;
 316
 317 /// This is the minimum number of messages we expect a peer to be able to handle within one timer
 318 /// tick. Once we have sent this many messages since the last ping, we send a ping right away to
 319 /// ensures we don't just fill up our send buffer and leave the peer with too many messages to
 320 /// process before the next ping.
 321 const BUFFER_DRAIN_MSGS_PER_TICK: usize = 32;
 322
 323 struct Peer {
 324         channel_encryptor: PeerChannelEncryptor,
 325         their_node_id: Option<PublicKey>,
 326         their_features: Option<InitFeatures>,
 327         their_net_address: Option<NetAddress>,
 328
 329         pending_outbound_buffer: LinkedList<Vec<u8>>,
 330         pending_outbound_buffer_first_msg_offset: usize,
 331         awaiting_write_event: bool,
 332
 333         pending_read_buffer: Vec<u8>,
 334         pending_read_buffer_pos: usize,
 335         pending_read_is_header: bool,
 336
 337         sync_status: InitSyncTracker,
 338
 339         msgs_sent_since_pong: usize,
 340         awaiting_pong_timer_tick_intervals: i8,
 341         received_message_since_timer_tick: bool,
 342         sent_gossip_timestamp_filter: bool,
 343 }
 344
 345 impl Peer {
 346         /// Returns true if the channel announcements/updates for the given channel should be
 347         /// forwarded to this peer.
 348         /// If we are sending our routing table to this peer and we have not yet sent channel
 349         /// announcements/updates for the given channel_id then we will send it when we get to that
 350         /// point and we shouldn't send it yet to avoid sending duplicate updates. If we've already
 351         /// sent the old versions, we should send the update, and so return true here.
 352         fn should_forward_channel_announcement(&self, channel_id: u64) -> bool {
 353                 if self.their_features.as_ref().unwrap().supports_gossip_queries() &&
 354                         !self.sent_gossip_timestamp_filter {
 355                                 return false;
 356                         }
 357                 match self.sync_status {
 358                         InitSyncTracker::NoSyncRequested => true,
 359                         InitSyncTracker::ChannelsSyncing(i) => i < channel_id,
 360                         InitSyncTracker::NodesSyncing(_) => true,
 361                 }
 362         }
 363
 364         /// Similar to the above, but for node announcements indexed by node_id.
 365         fn should_forward_node_announcement(&self, node_id: PublicKey) -> bool {
 366                 if self.their_features.as_ref().unwrap().supports_gossip_queries() &&
 367                         !self.sent_gossip_timestamp_filter {
 368                                 return false;
 369                         }
 370                 match self.sync_status {
 371                         InitSyncTracker::NoSyncRequested => true,
 372                         InitSyncTracker::ChannelsSyncing(_) => false,
 373                         InitSyncTracker::NodesSyncing(pk) => pk < node_id,
 374                 }
 375         }
 376 }
 377
 378 struct PeerHolder<Descriptor: SocketDescriptor> {
 379         peers: HashMap<Descriptor, Mutex<Peer>>,
 380 }
 381
 382 /// SimpleArcPeerManager is useful when you need a PeerManager with a static lifetime, e.g.
 383 /// when you're using lightning-net-tokio (since tokio::spawn requires parameters with static
 384 /// lifetimes). Other times you can afford a reference, which is more efficient, in which case
 385 /// SimpleRefPeerManager is the more appropriate type. Defining these type aliases prevents
 386 /// issues such as overly long function definitions.
 387 ///
 388 /// (C-not exported) as Arcs don't make sense in bindings
 389 pub type SimpleArcPeerManager<SD, M, T, F, C, L> = PeerManager<SD, Arc<SimpleArcChannelManager<M, T, F, L>>, Arc<NetGraphMsgHandler<Arc<NetworkGraph>, Arc<C>, Arc<L>>>, Arc<L>, Arc<IgnoringMessageHandler>>;
 390
 391 /// SimpleRefPeerManager is a type alias for a PeerManager reference, and is the reference
 392 /// counterpart to the SimpleArcPeerManager type alias. Use this type by default when you don't
 393 /// need a PeerManager with a static lifetime. You'll need a static lifetime in cases such as
 394 /// usage of lightning-net-tokio (since tokio::spawn requires parameters with static lifetimes).
 395 /// But if this is not necessary, using a reference is more efficient. Defining these type aliases
 396 /// helps with issues such as long function definitions.
 397 ///
 398 /// (C-not exported) as Arcs don't make sense in bindings
 399 pub type SimpleRefPeerManager<'a, 'b, 'c, 'd, 'e, 'f, 'g, 'h, SD, M, T, F, C, L> = PeerManager<SD, SimpleRefChannelManager<'a, 'b, 'c, 'd, 'e, M, T, F, L>, &'e NetGraphMsgHandler<&'g NetworkGraph, &'h C, &'f L>, &'f L, IgnoringMessageHandler>;
 400
 401 /// A PeerManager manages a set of peers, described by their [`SocketDescriptor`] and marshalls
 402 /// socket events into messages which it passes on to its [`MessageHandler`].
 403 ///
 404 /// Locks are taken internally, so you must never assume that reentrancy from a
 405 /// [`SocketDescriptor`] call back into [`PeerManager`] methods will not deadlock.
 406 ///
 407 /// Calls to [`read_event`] will decode relevant messages and pass them to the
 408 /// [`ChannelMessageHandler`], likely doing message processing in-line. Thus, the primary form of
 409 /// parallelism in Rust-Lightning is in calls to [`read_event`]. Note, however, that calls to any
 410 /// [`PeerManager`] functions related to the same connection must occur only in serial, making new
 411 /// calls only after previous ones have returned.
 412 ///
 413 /// Rather than using a plain PeerManager, it is preferable to use either a SimpleArcPeerManager
 414 /// a SimpleRefPeerManager, for conciseness. See their documentation for more details, but
 415 /// essentially you should default to using a SimpleRefPeerManager, and use a
 416 /// SimpleArcPeerManager when you require a PeerManager with a static lifetime, such as when
 417 /// you're using lightning-net-tokio.
 418 ///
 419 /// [`read_event`]: PeerManager::read_event
 420 pub struct PeerManager<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, L: Deref, CMH: Deref> where
 421                 CM::Target: ChannelMessageHandler,
 422                 RM::Target: RoutingMessageHandler,
 423                 L::Target: Logger,
 424                 CMH::Target: CustomMessageHandler {
 425         message_handler: MessageHandler<CM, RM>,
 426         peers: RwLock<PeerHolder<Descriptor>>,
 427         /// Only add to this set when noise completes.
 428         /// Locked *after* peers. When an item is removed, it must be removed with the `peers` write
 429         /// lock held. Entries may be added with only the `peers` read lock held (though the
 430         /// `Descriptor` value must already exist in `peers`).
 431         node_id_to_descriptor: Mutex<HashMap<PublicKey, Descriptor>>,
 432         our_node_secret: SecretKey,
 433         ephemeral_key_midstate: Sha256Engine,
 434         custom_message_handler: CMH,
 435
 436         peer_counter: AtomicCounter,
 437
 438         logger: L,
 439 }
 440
 441 enum MessageHandlingError {
 442         PeerHandleError(PeerHandleError),
 443         LightningError(LightningError),
 444 }
 445
 446 impl From<PeerHandleError> for MessageHandlingError {
 447         fn from(error: PeerHandleError) -> Self {
 448                 MessageHandlingError::PeerHandleError(error)
 449         }
 450 }
 451
 452 impl From<LightningError> for MessageHandlingError {
 453         fn from(error: LightningError) -> Self {
 454                 MessageHandlingError::LightningError(error)
 455         }
 456 }
 457
 458 macro_rules! encode_msg {
 459         ($msg: expr) => {{
 460                 let mut buffer = VecWriter(Vec::new());
 461                 wire::write($msg, &mut buffer).unwrap();
 462                 buffer.0
 463         }}
 464 }
 465
 466 impl<Descriptor: SocketDescriptor, CM: Deref, L: Deref> PeerManager<Descriptor, CM, IgnoringMessageHandler, L, IgnoringMessageHandler> where
 467                 CM::Target: ChannelMessageHandler,
 468                 L::Target: Logger {
 469         /// Constructs a new PeerManager with the given ChannelMessageHandler. No routing message
 470         /// handler is used and network graph messages are ignored.
 471         ///
 472         /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
 473         /// cryptographically secure random bytes.
 474         ///
 475         /// (C-not exported) as we can't export a PeerManager with a dummy route handler
 476         pub fn new_channel_only(channel_message_handler: CM, our_node_secret: SecretKey, ephemeral_random_data: &[u8; 32], logger: L) -> Self {
 477                 Self::new(MessageHandler {
 478                         chan_handler: channel_message_handler,
 479                         route_handler: IgnoringMessageHandler{},
 480                 }, our_node_secret, ephemeral_random_data, logger, IgnoringMessageHandler{})
 481         }
 482 }
 483
 484 impl<Descriptor: SocketDescriptor, RM: Deref, L: Deref> PeerManager<Descriptor, ErroringMessageHandler, RM, L, IgnoringMessageHandler> where
 485                 RM::Target: RoutingMessageHandler,
 486                 L::Target: Logger {
 487         /// Constructs a new PeerManager with the given RoutingMessageHandler. No channel message
 488         /// handler is used and messages related to channels will be ignored (or generate error
 489         /// messages). Note that some other lightning implementations time-out connections after some
 490         /// time if no channel is built with the peer.
 491         ///
 492         /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
 493         /// cryptographically secure random bytes.
 494         ///
 495         /// (C-not exported) as we can't export a PeerManager with a dummy channel handler
 496         pub fn new_routing_only(routing_message_handler: RM, our_node_secret: SecretKey, ephemeral_random_data: &[u8; 32], logger: L) -> Self {
 497                 Self::new(MessageHandler {
 498                         chan_handler: ErroringMessageHandler::new(),
 499                         route_handler: routing_message_handler,
 500                 }, our_node_secret, ephemeral_random_data, logger, IgnoringMessageHandler{})
 501         }
 502 }
 503
 504 /// A simple wrapper that optionally prints " from <pubkey>" for an optional pubkey.
 505 /// This works around `format!()` taking a reference to each argument, preventing
 506 /// `if let Some(node_id) = peer.their_node_id { format!(.., node_id) } else { .. }` from compiling
 507 /// due to lifetime errors.
 508 struct OptionalFromDebugger<'a>(&'a Option<PublicKey>);
 509 impl core::fmt::Display for OptionalFromDebugger<'_> {
 510         fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> Result<(), core::fmt::Error> {
 511                 if let Some(node_id) = self.0 { write!(f, " from {}", log_pubkey!(node_id)) } else { Ok(()) }
 512         }
 513 }
 514
 515 /// A function used to filter out local or private addresses
 516 /// https://www.iana.org./assignments/ipv4-address-space/ipv4-address-space.xhtml
 517 /// https://www.iana.org/assignments/ipv6-address-space/ipv6-address-space.xhtml
 518 fn filter_addresses(ip_address: Option<NetAddress>) -> Option<NetAddress> {
 519         match ip_address{
 520                 // For IPv4 range 10.0.0.0 - 10.255.255.255 (10/8)
 521                 Some(NetAddress::IPv4{addr: [10, _, _, _], port: _}) => None,
 522                 // For IPv4 range 0.0.0.0 - 0.255.255.255 (0/8)
 523                 Some(NetAddress::IPv4{addr: [0, _, _, _], port: _}) => None,
 524                 // For IPv4 range 100.64.0.0 - 100.127.255.255 (100.64/10)
 525                 Some(NetAddress::IPv4{addr: [100, 64..=127, _, _], port: _}) => None,
 526                 // For IPv4 range       127.0.0.0 - 127.255.255.255 (127/8)
 527                 Some(NetAddress::IPv4{addr: [127, _, _, _], port: _}) => None,
 528                 // For IPv4 range       169.254.0.0 - 169.254.255.255 (169.254/16)
 529                 Some(NetAddress::IPv4{addr: [169, 254, _, _], port: _}) => None,
 530                 // For IPv4 range 172.16.0.0 - 172.31.255.255 (172.16/12)
 531                 Some(NetAddress::IPv4{addr: [172, 16..=31, _, _], port: _}) => None,
 532                 // For IPv4 range 192.168.0.0 - 192.168.255.255 (192.168/16)
 533                 Some(NetAddress::IPv4{addr: [192, 168, _, _], port: _}) => None,
 534                 // For IPv4 range 192.88.99.0 - 192.88.99.255  (192.88.99/24)
 535                 Some(NetAddress::IPv4{addr: [192, 88, 99, _], port: _}) => None,
 536                 // For IPv6 range 2000:0000:0000:0000:0000:0000:0000:0000 - 3fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff (2000::/3)
 537                 Some(NetAddress::IPv6{addr: [0x20..=0x3F, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _], port: _}) => ip_address,
 538                 // For remaining addresses
 539                 Some(NetAddress::IPv6{addr: _, port: _}) => None,
 540                 Some(..) => ip_address,
 541                 None => None,
 542         }
 543 }
 544
 545 impl<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, L: Deref, CMH: Deref> PeerManager<Descriptor, CM, RM, L, CMH> where
 546                 CM::Target: ChannelMessageHandler,
 547                 RM::Target: RoutingMessageHandler,
 548                 L::Target: Logger,
 549                 CMH::Target: CustomMessageHandler {
 550         /// Constructs a new PeerManager with the given message handlers and node_id secret key
 551         /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
 552         /// cryptographically secure random bytes.
 553         pub fn new(message_handler: MessageHandler<CM, RM>, our_node_secret: SecretKey, ephemeral_random_data: &[u8; 32], logger: L, custom_message_handler: CMH) -> Self {
 554                 let mut ephemeral_key_midstate = Sha256::engine();
 555                 ephemeral_key_midstate.input(ephemeral_random_data);
 556
 557                 PeerManager {
 558                         message_handler,
 559                         peers: RwLock::new(PeerHolder {
 560                                 peers: HashMap::new(),
 561                         }),
 562                         node_id_to_descriptor: Mutex::new(HashMap::new()),
 563                         our_node_secret,
 564                         ephemeral_key_midstate,
 565                         peer_counter: AtomicCounter::new(),
 566                         logger,
 567                         custom_message_handler,
 568                 }
 569         }
 570
 571         /// Get the list of node ids for peers which have completed the initial handshake.
 572         ///
 573         /// For outbound connections, this will be the same as the their_node_id parameter passed in to
 574         /// new_outbound_connection, however entries will only appear once the initial handshake has
 575         /// completed and we are sure the remote peer has the private key for the given node_id.
 576         pub fn get_peer_node_ids(&self) -> Vec<PublicKey> {
 577                 let peers = self.peers.read().unwrap();
 578                 peers.peers.values().filter_map(|peer_mutex| {
 579                         let p = peer_mutex.lock().unwrap();
 580                         if !p.channel_encryptor.is_ready_for_encryption() || p.their_features.is_none() {
 581                                 return None;
 582                         }
 583                         p.their_node_id
 584                 }).collect()
 585         }
 586
 587         fn get_ephemeral_key(&self) -> SecretKey {
 588                 let mut ephemeral_hash = self.ephemeral_key_midstate.clone();
 589                 let counter = self.peer_counter.get_increment();
 590                 ephemeral_hash.input(&counter.to_le_bytes());
 591                 SecretKey::from_slice(&Sha256::from_engine(ephemeral_hash).into_inner()).expect("You broke SHA-256!")
 592         }
 593
 594         /// Indicates a new outbound connection has been established to a node with the given node_id
 595         /// and an optional remote network address.
 596         ///
 597         /// The remote network address adds the option to report a remote IP address back to a connecting
 598         /// peer using the init message.
 599         /// The user should pass the remote network address of the host they are connected to.
 600         ///
 601         /// Note that if an Err is returned here you MUST NOT call socket_disconnected for the new
 602         /// descriptor but must disconnect the connection immediately.
 603         ///
 604         /// Returns a small number of bytes to send to the remote node (currently always 50).
 605         ///
 606         /// Panics if descriptor is duplicative with some other descriptor which has not yet been
 607         /// [`socket_disconnected()`].
 608         ///
 609         /// [`socket_disconnected()`]: PeerManager::socket_disconnected
 610         pub fn new_outbound_connection(&self, their_node_id: PublicKey, descriptor: Descriptor, remote_network_address: Option<NetAddress>) -> Result<Vec<u8>, PeerHandleError> {
 611                 let mut peer_encryptor = PeerChannelEncryptor::new_outbound(their_node_id.clone(), self.get_ephemeral_key());
 612                 let res = peer_encryptor.get_act_one().to_vec();
 613                 let pending_read_buffer = [0; 50].to_vec(); // Noise act two is 50 bytes
 614
 615                 let mut peers = self.peers.write().unwrap();
 616                 if peers.peers.insert(descriptor, Mutex::new(Peer {
 617                         channel_encryptor: peer_encryptor,
 618                         their_node_id: None,
 619                         their_features: None,
 620                         their_net_address: remote_network_address,
 621
 622                         pending_outbound_buffer: LinkedList::new(),
 623                         pending_outbound_buffer_first_msg_offset: 0,
 624                         awaiting_write_event: false,
 625
 626                         pending_read_buffer,
 627                         pending_read_buffer_pos: 0,
 628                         pending_read_is_header: false,
 629
 630                         sync_status: InitSyncTracker::NoSyncRequested,
 631
 632                         msgs_sent_since_pong: 0,
 633                         awaiting_pong_timer_tick_intervals: 0,
 634                         received_message_since_timer_tick: false,
 635                         sent_gossip_timestamp_filter: false,
 636                 })).is_some() {
 637                         panic!("PeerManager driver duplicated descriptors!");
 638                 };
 639                 Ok(res)
 640         }
 641
 642         /// Indicates a new inbound connection has been established to a node with an optional remote
 643         /// network address.
 644         ///
 645         /// The remote network address adds the option to report a remote IP address back to a connecting
 646         /// peer using the init message.
 647         /// The user should pass the remote network address of the host they are connected to.
 648         ///
 649         /// May refuse the connection by returning an Err, but will never write bytes to the remote end
 650         /// (outbound connector always speaks first). Note that if an Err is returned here you MUST NOT
 651         /// call socket_disconnected for the new descriptor but must disconnect the connection
 652         /// immediately.
 653         ///
 654         /// Panics if descriptor is duplicative with some other descriptor which has not yet been
 655         /// [`socket_disconnected()`].
 656         ///
 657         /// [`socket_disconnected()`]: PeerManager::socket_disconnected
 658         pub fn new_inbound_connection(&self, descriptor: Descriptor, remote_network_address: Option<NetAddress>) -> Result<(), PeerHandleError> {
 659                 let peer_encryptor = PeerChannelEncryptor::new_inbound(&self.our_node_secret);
 660                 let pending_read_buffer = [0; 50].to_vec(); // Noise act one is 50 bytes
 661
 662                 let mut peers = self.peers.write().unwrap();
 663                 if peers.peers.insert(descriptor, Mutex::new(Peer {
 664                         channel_encryptor: peer_encryptor,
 665                         their_node_id: None,
 666                         their_features: None,
 667                         their_net_address: remote_network_address,
 668
 669                         pending_outbound_buffer: LinkedList::new(),
 670                         pending_outbound_buffer_first_msg_offset: 0,
 671                         awaiting_write_event: false,
 672
 673                         pending_read_buffer,
 674                         pending_read_buffer_pos: 0,
 675                         pending_read_is_header: false,
 676
 677                         sync_status: InitSyncTracker::NoSyncRequested,
 678
 679                         msgs_sent_since_pong: 0,
 680                         awaiting_pong_timer_tick_intervals: 0,
 681                         received_message_since_timer_tick: false,
 682                         sent_gossip_timestamp_filter: false,
 683                 })).is_some() {
 684                         panic!("PeerManager driver duplicated descriptors!");
 685                 };
 686                 Ok(())
 687         }
 688
 689         fn do_attempt_write_data(&self, descriptor: &mut Descriptor, peer: &mut Peer) {
 690                 while !peer.awaiting_write_event {
 691                         if peer.pending_outbound_buffer.len() < OUTBOUND_BUFFER_LIMIT_READ_PAUSE && peer.msgs_sent_since_pong < BUFFER_DRAIN_MSGS_PER_TICK {
 692                                 match peer.sync_status {
 693                                         InitSyncTracker::NoSyncRequested => {},
 694                                         InitSyncTracker::ChannelsSyncing(c) if c < 0xffff_ffff_ffff_ffff => {
 695                                                 let steps = ((OUTBOUND_BUFFER_LIMIT_READ_PAUSE - peer.pending_outbound_buffer.len() + 2) / 3) as u8;
 696                                                 let all_messages = self.message_handler.route_handler.get_next_channel_announcements(c, steps);
 697                                                 for &(ref announce, ref update_a_option, ref update_b_option) in all_messages.iter() {
 698                                                         self.enqueue_message(peer, announce);
 699                                                         if let &Some(ref update_a) = update_a_option {
 700                                                                 self.enqueue_message(peer, update_a);
 701                                                         }
 702                                                         if let &Some(ref update_b) = update_b_option {
 703                                                                 self.enqueue_message(peer, update_b);
 704                                                         }
 705                                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(announce.contents.short_channel_id + 1);
 706                                                 }
 707                                                 if all_messages.is_empty() || all_messages.len() != steps as usize {
 708                                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(0xffff_ffff_ffff_ffff);
 709                                                 }
 710                                         },
 711                                         InitSyncTracker::ChannelsSyncing(c) if c == 0xffff_ffff_ffff_ffff => {
 712                                                 let steps = (OUTBOUND_BUFFER_LIMIT_READ_PAUSE - peer.pending_outbound_buffer.len()) as u8;
 713                                                 let all_messages = self.message_handler.route_handler.get_next_node_announcements(None, steps);
 714                                                 for msg in all_messages.iter() {
 715                                                         self.enqueue_message(peer, msg);
 716                                                         peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
 717                                                 }
 718                                                 if all_messages.is_empty() || all_messages.len() != steps as usize {
 719                                                         peer.sync_status = InitSyncTracker::NoSyncRequested;
 720                                                 }
 721                                         },
 722                                         InitSyncTracker::ChannelsSyncing(_) => unreachable!(),
 723                                         InitSyncTracker::NodesSyncing(key) => {
 724                                                 let steps = (OUTBOUND_BUFFER_LIMIT_READ_PAUSE - peer.pending_outbound_buffer.len()) as u8;
 725                                                 let all_messages = self.message_handler.route_handler.get_next_node_announcements(Some(&key), steps);
 726                                                 for msg in all_messages.iter() {
 727                                                         self.enqueue_message(peer, msg);
 728                                                         peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
 729                                                 }
 730                                                 if all_messages.is_empty() || all_messages.len() != steps as usize {
 731                                                         peer.sync_status = InitSyncTracker::NoSyncRequested;
 732                                                 }
 733                                         },
 734                                 }
 735                         }
 736                         if peer.msgs_sent_since_pong >= BUFFER_DRAIN_MSGS_PER_TICK {
 737                                 self.maybe_send_extra_ping(peer);
 738                         }
 739
 740                         if {
 741                                 let next_buff = match peer.pending_outbound_buffer.front() {
 742                                         None => return,
 743                                         Some(buff) => buff,
 744                                 };
 745
 746                                 let should_be_reading = peer.pending_outbound_buffer.len() < OUTBOUND_BUFFER_LIMIT_READ_PAUSE;
 747                                 let pending = &next_buff[peer.pending_outbound_buffer_first_msg_offset..];
 748                                 let data_sent = descriptor.send_data(pending, should_be_reading);
 749                                 peer.pending_outbound_buffer_first_msg_offset += data_sent;
 750                                 if peer.pending_outbound_buffer_first_msg_offset == next_buff.len() { true } else { false }
 751                         } {
 752                                 peer.pending_outbound_buffer_first_msg_offset = 0;
 753                                 peer.pending_outbound_buffer.pop_front();
 754                         } else {
 755                                 peer.awaiting_write_event = true;
 756                         }
 757                 }
 758         }
 759
 760         /// Indicates that there is room to write data to the given socket descriptor.
 761         ///
 762         /// May return an Err to indicate that the connection should be closed.
 763         ///
 764         /// May call [`send_data`] on the descriptor passed in (or an equal descriptor) before
 765         /// returning. Thus, be very careful with reentrancy issues! The invariants around calling
 766         /// [`write_buffer_space_avail`] in case a write did not fully complete must still hold - be
 767         /// ready to call `[write_buffer_space_avail`] again if a write call generated here isn't
 768         /// sufficient!
 769         ///
 770         /// [`send_data`]: SocketDescriptor::send_data
 771         /// [`write_buffer_space_avail`]: PeerManager::write_buffer_space_avail
 772         pub fn write_buffer_space_avail(&self, descriptor: &mut Descriptor) -> Result<(), PeerHandleError> {
 773                 let peers = self.peers.read().unwrap();
 774                 match peers.peers.get(descriptor) {
 775                         None => {
 776                                 // This is most likely a simple race condition where the user found that the socket
 777                                 // was writeable, then we told the user to `disconnect_socket()`, then they called
 778                                 // this method. Return an error to make sure we get disconnected.
 779                                 return Err(PeerHandleError { no_connection_possible: false });
 780                         },
 781                         Some(peer_mutex) => {
 782                                 let mut peer = peer_mutex.lock().unwrap();
 783                                 peer.awaiting_write_event = false;
 784                                 self.do_attempt_write_data(descriptor, &mut peer);
 785                         }
 786                 };
 787                 Ok(())
 788         }
 789
 790         /// Indicates that data was read from the given socket descriptor.
 791         ///
 792         /// May return an Err to indicate that the connection should be closed.
 793         ///
 794         /// Will *not* call back into [`send_data`] on any descriptors to avoid reentrancy complexity.
 795         /// Thus, however, you should call [`process_events`] after any `read_event` to generate
 796         /// [`send_data`] calls to handle responses.
 797         ///
 798         /// If `Ok(true)` is returned, further read_events should not be triggered until a
 799         /// [`send_data`] call on this descriptor has `resume_read` set (preventing DoS issues in the
 800         /// send buffer).
 801         ///
 802         /// [`send_data`]: SocketDescriptor::send_data
 803         /// [`process_events`]: PeerManager::process_events
 804         pub fn read_event(&self, peer_descriptor: &mut Descriptor, data: &[u8]) -> Result<bool, PeerHandleError> {
 805                 match self.do_read_event(peer_descriptor, data) {
 806                         Ok(res) => Ok(res),
 807                         Err(e) => {
 808                                 log_trace!(self.logger, "Peer sent invalid data or we decided to disconnect due to a protocol error");
 809                                 self.disconnect_event_internal(peer_descriptor, e.no_connection_possible);
 810                                 Err(e)
 811                         }
 812                 }
 813         }
 814
 815         /// Append a message to a peer's pending outbound/write buffer
 816         fn enqueue_encoded_message(&self, peer: &mut Peer, encoded_message: &Vec<u8>) {
 817                 peer.msgs_sent_since_pong += 1;
 818                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_message[..]));
 819         }
 820
 821         /// Append a message to a peer's pending outbound/write buffer
 822         fn enqueue_message<M: wire::Type>(&self, peer: &mut Peer, message: &M) {
 823                 let mut buffer = VecWriter(Vec::with_capacity(2048));
 824                 wire::write(message, &mut buffer).unwrap(); // crash if the write failed
 825
 826                 if is_gossip_msg(message.type_id()) {
 827                         log_gossip!(self.logger, "Enqueueing message {:?} to {}", message, log_pubkey!(peer.their_node_id.unwrap()));
 828                 } else {
 829                         log_trace!(self.logger, "Enqueueing message {:?} to {}", message, log_pubkey!(peer.their_node_id.unwrap()))
 830                 }
 831                 self.enqueue_encoded_message(peer, &buffer.0);
 832         }
 833
 834         fn do_read_event(&self, peer_descriptor: &mut Descriptor, data: &[u8]) -> Result<bool, PeerHandleError> {
 835                 let pause_read = {
 836                         let peers = self.peers.read().unwrap();
 837                         let mut msgs_to_forward = Vec::new();
 838                         let mut peer_node_id = None;
 839                         let pause_read = match peers.peers.get(peer_descriptor) {
 840                                 None => {
 841                                         // This is most likely a simple race condition where the user read some bytes
 842                                         // from the socket, then we told the user to `disconnect_socket()`, then they
 843                                         // called this method. Return an error to make sure we get disconnected.
 844                                         return Err(PeerHandleError { no_connection_possible: false });
 845                                 },
 846                                 Some(peer_mutex) => {
 847                                         let mut peer_lock = peer_mutex.lock().unwrap();
 848                                         let peer = &mut *peer_lock;
 849
 850                                         assert!(peer.pending_read_buffer.len() > 0);
 851                                         assert!(peer.pending_read_buffer.len() > peer.pending_read_buffer_pos);
 852
 853                                         let mut read_pos = 0;
 854                                         while read_pos < data.len() {
 855                                                 {
 856                                                         let data_to_copy = cmp::min(peer.pending_read_buffer.len() - peer.pending_read_buffer_pos, data.len() - read_pos);
 857                                                         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]);
 858                                                         read_pos += data_to_copy;
 859                                                         peer.pending_read_buffer_pos += data_to_copy;
 860                                                 }
 861
 862                                                 if peer.pending_read_buffer_pos == peer.pending_read_buffer.len() {
 863                                                         peer.pending_read_buffer_pos = 0;
 864
 865                                                         macro_rules! try_potential_handleerror {
 866                                                                 ($thing: expr) => {
 867                                                                         match $thing {
 868                                                                                 Ok(x) => x,
 869                                                                                 Err(e) => {
 870                                                                                         match e.action {
 871                                                                                                 msgs::ErrorAction::DisconnectPeer { msg: _ } => {
 872                                                                                                         //TODO: Try to push msg
 873                                                                                                         log_debug!(self.logger, "Error handling message{}; disconnecting peer with: {}", OptionalFromDebugger(&peer.their_node_id), e.err);
 874                                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 875                                                                                                 },
 876                                                                                                 msgs::ErrorAction::IgnoreAndLog(level) => {
 877                                                                                                         log_given_level!(self.logger, level, "Error handling message{}; ignoring: {}", OptionalFromDebugger(&peer.their_node_id), e.err);
 878                                                                                                         continue
 879                                                                                                 },
 880                                                                                                 msgs::ErrorAction::IgnoreDuplicateGossip => continue, // Don't even bother logging these
 881                                                                                                 msgs::ErrorAction::IgnoreError => {
 882                                                                                                         log_debug!(self.logger, "Error handling message{}; ignoring: {}", OptionalFromDebugger(&peer.their_node_id), e.err);
 883                                                                                                         continue;
 884                                                                                                 },
 885                                                                                                 msgs::ErrorAction::SendErrorMessage { msg } => {
 886                                                                                                         log_debug!(self.logger, "Error handling message{}; sending error message with: {}", OptionalFromDebugger(&peer.their_node_id), e.err);
 887                                                                                                         self.enqueue_message(peer, &msg);
 888                                                                                                         continue;
 889                                                                                                 },
 890                                                                                                 msgs::ErrorAction::SendWarningMessage { msg, log_level } => {
 891                                                                                                         log_given_level!(self.logger, log_level, "Error handling message{}; sending warning message with: {}", OptionalFromDebugger(&peer.their_node_id), e.err);
 892                                                                                                         self.enqueue_message(peer, &msg);
 893                                                                                                         continue;
 894                                                                                                 },
 895                                                                                         }
 896                                                                                 }
 897                                                                         }
 898                                                                 }
 899                                                         }
 900
 901                                                         macro_rules! insert_node_id {
 902                                                                 () => {
 903                                                                         match self.node_id_to_descriptor.lock().unwrap().entry(peer.their_node_id.unwrap()) {
 904                                                                                 hash_map::Entry::Occupied(_) => {
 905                                                                                         log_trace!(self.logger, "Got second connection with {}, closing", log_pubkey!(peer.their_node_id.unwrap()));
 906                                                                                         peer.their_node_id = None; // Unset so that we don't generate a peer_disconnected event
 907                                                                                         return Err(PeerHandleError{ no_connection_possible: false })
 908                                                                                 },
 909                                                                                 hash_map::Entry::Vacant(entry) => {
 910                                                                                         log_debug!(self.logger, "Finished noise handshake for connection with {}", log_pubkey!(peer.their_node_id.unwrap()));
 911                                                                                         entry.insert(peer_descriptor.clone())
 912                                                                                 },
 913                                                                         };
 914                                                                 }
 915                                                         }
 916
 917                                                         let next_step = peer.channel_encryptor.get_noise_step();
 918                                                         match next_step {
 919                                                                 NextNoiseStep::ActOne => {
 920                                                                         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();
 921                                                                         peer.pending_outbound_buffer.push_back(act_two);
 922                                                                         peer.pending_read_buffer = [0; 66].to_vec(); // act three is 66 bytes long
 923                                                                 },
 924                                                                 NextNoiseStep::ActTwo => {
 925                                                                         let (act_three, their_node_id) = try_potential_handleerror!(peer.channel_encryptor.process_act_two(&peer.pending_read_buffer[..], &self.our_node_secret));
 926                                                                         peer.pending_outbound_buffer.push_back(act_three.to_vec());
 927                                                                         peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
 928                                                                         peer.pending_read_is_header = true;
 929
 930                                                                         peer.their_node_id = Some(their_node_id);
 931                                                                         insert_node_id!();
 932                                                                         let features = InitFeatures::known();
 933                                                                         let resp = msgs::Init { features, remote_network_address: filter_addresses(peer.their_net_address.clone())};
 934                                                                         self.enqueue_message(peer, &resp);
 935                                                                         peer.awaiting_pong_timer_tick_intervals = 0;
 936                                                                 },
 937                                                                 NextNoiseStep::ActThree => {
 938                                                                         let their_node_id = try_potential_handleerror!(peer.channel_encryptor.process_act_three(&peer.pending_read_buffer[..]));
 939                                                                         peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
 940                                                                         peer.pending_read_is_header = true;
 941                                                                         peer.their_node_id = Some(their_node_id);
 942                                                                         insert_node_id!();
 943                                                                         let features = InitFeatures::known();
 944                                                                         let resp = msgs::Init { features, remote_network_address: filter_addresses(peer.their_net_address.clone())};
 945                                                                         self.enqueue_message(peer, &resp);
 946                                                                         peer.awaiting_pong_timer_tick_intervals = 0;
 947                                                                 },
 948                                                                 NextNoiseStep::NoiseComplete => {
 949                                                                         if peer.pending_read_is_header {
 950                                                                                 let msg_len = try_potential_handleerror!(peer.channel_encryptor.decrypt_length_header(&peer.pending_read_buffer[..]));
 951                                                                                 peer.pending_read_buffer = Vec::with_capacity(msg_len as usize + 16);
 952                                                                                 peer.pending_read_buffer.resize(msg_len as usize + 16, 0);
 953                                                                                 if msg_len < 2 { // Need at least the message type tag
 954                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 955                                                                                 }
 956                                                                                 peer.pending_read_is_header = false;
 957                                                                         } else {
 958                                                                                 let msg_data = try_potential_handleerror!(peer.channel_encryptor.decrypt_message(&peer.pending_read_buffer[..]));
 959                                                                                 assert!(msg_data.len() >= 2);
 960
 961                                                                                 // Reset read buffer
 962                                                                                 peer.pending_read_buffer = [0; 18].to_vec();
 963                                                                                 peer.pending_read_is_header = true;
 964
 965                                                                                 let mut reader = io::Cursor::new(&msg_data[..]);
 966                                                                                 let message_result = wire::read(&mut reader, &*self.custom_message_handler);
 967                                                                                 let message = match message_result {
 968                                                                                         Ok(x) => x,
 969                                                                                         Err(e) => {
 970                                                                                                 match e {
 971                                                                                                         // Note that to avoid recursion we never call
 972                                                                                                         // `do_attempt_write_data` from here, causing
 973                                                                                                         // the messages enqueued here to not actually
 974                                                                                                         // be sent before the peer is disconnected.
 975                                                                                                         (msgs::DecodeError::UnknownRequiredFeature, Some(ty)) if is_gossip_msg(ty) => {
 976                                                                                                                 log_gossip!(self.logger, "Got a channel/node announcement with an unknown required feature flag, you may want to update!");
 977                                                                                                                 continue;
 978                                                                                                         }
 979                                                                                                         (msgs::DecodeError::UnsupportedCompression, _) => {
 980                                                                                                                 log_gossip!(self.logger, "We don't support zlib-compressed message fields, sending a warning and ignoring message");
 981                                                                                                                 self.enqueue_message(peer, &msgs::WarningMessage { channel_id: [0; 32], data: "Unsupported message compression: zlib".to_owned() });
 982                                                                                                                 continue;
 983                                                                                                         }
 984                                                                                                         (_, Some(ty)) if is_gossip_msg(ty) => {
 985                                                                                                                 log_gossip!(self.logger, "Got an invalid value while deserializing a gossip message");
 986                                                                                                                 self.enqueue_message(peer, &msgs::WarningMessage { channel_id: [0; 32], data: "Unreadable/bogus gossip message".to_owned() });
 987                                                                                                                 continue;
 988                                                                                                         }
 989                                                                                                         (msgs::DecodeError::UnknownRequiredFeature, ty) => {
 990                                                                                                                 log_gossip!(self.logger, "Received a message with an unknown required feature flag or TLV, you may want to update!");
 991                                                                                                                 self.enqueue_message(peer, &msgs::WarningMessage { channel_id: [0; 32], data: format!("Received an unknown required feature/TLV in message type {:?}", ty) });
 992                                                                                                                 return Err(PeerHandleError { no_connection_possible: false });
 993                                                                                                         }
 994                                                                                                         (msgs::DecodeError::UnknownVersion, _) => return Err(PeerHandleError { no_connection_possible: false }),
 995                                                                                                         (msgs::DecodeError::InvalidValue, _) => {
 996                                                                                                                 log_debug!(self.logger, "Got an invalid value while deserializing message");
 997                                                                                                                 return Err(PeerHandleError { no_connection_possible: false });
 998                                                                                                         }
 999                                                                                                         (msgs::DecodeError::ShortRead, _) => {
1000                                                                                                                 log_debug!(self.logger, "Deserialization failed due to shortness of message");
1001                                                                                                                 return Err(PeerHandleError { no_connection_possible: false });
1002                                                                                                         }
1003                                                                                                         (msgs::DecodeError::BadLengthDescriptor, _) => return Err(PeerHandleError { no_connection_possible: false }),
1004                                                                                                         (msgs::DecodeError::Io(_), _) => return Err(PeerHandleError { no_connection_possible: false }),
1005                                                                                                 }
1006                                                                                         }
1007                                                                                 };
1008
1009                                                                                 match self.handle_message(peer, message) {
1010                                                                                         Err(handling_error) => match handling_error {
1011                                                                                                 MessageHandlingError::PeerHandleError(e) => { return Err(e) },
1012                                                                                                 MessageHandlingError::LightningError(e) => {
1013                                                                                                         try_potential_handleerror!(Err(e));
1014                                                                                                 },
1015                                                                                         },
1016                                                                                         Ok(Some(msg)) => {
1017                                                                                                 peer_node_id = Some(peer.their_node_id.expect("After noise is complete, their_node_id is always set"));
1018                                                                                                 msgs_to_forward.push(msg);
1019                                                                                         },
1020                                                                                         Ok(None) => {},
1021                                                                                 }
1022                                                                         }
1023                                                                 }
1024                                                         }
1025                                                 }
1026                                         }
1027
1028                                         peer.pending_outbound_buffer.len() > OUTBOUND_BUFFER_LIMIT_READ_PAUSE // pause_read
1029                                 }
1030                         };
1031
1032                         for msg in msgs_to_forward.drain(..) {
1033                                 self.forward_broadcast_msg(&*peers, &msg, peer_node_id.as_ref());
1034                         }
1035
1036                         pause_read
1037                 };
1038
1039                 Ok(pause_read)
1040         }
1041
1042         /// Process an incoming message and return a decision (ok, lightning error, peer handling error) regarding the next action with the peer
1043         /// Returns the message back if it needs to be broadcasted to all other peers.
1044         fn handle_message(
1045                 &self,
1046                 peer: &mut Peer,
1047                 message: wire::Message<<<CMH as core::ops::Deref>::Target as wire::CustomMessageReader>::CustomMessage>
1048         ) -> Result<Option<wire::Message<<<CMH as core::ops::Deref>::Target as wire::CustomMessageReader>::CustomMessage>>, MessageHandlingError> {
1049                 if is_gossip_msg(message.type_id()) {
1050                         log_gossip!(self.logger, "Received message {:?} from {}", message, log_pubkey!(peer.their_node_id.unwrap()));
1051                 } else {
1052                         log_trace!(self.logger, "Received message {:?} from {}", message, log_pubkey!(peer.their_node_id.unwrap()));
1053                 }
1054
1055                 peer.received_message_since_timer_tick = true;
1056
1057                 // Need an Init as first message
1058                 if let wire::Message::Init(_) = message {
1059                 } else if peer.their_features.is_none() {
1060                         log_debug!(self.logger, "Peer {} sent non-Init first message", log_pubkey!(peer.their_node_id.unwrap()));
1061                         return Err(PeerHandleError{ no_connection_possible: false }.into());
1062                 }
1063
1064                 let mut should_forward = None;
1065
1066                 match message {
1067                         // Setup and Control messages:
1068                         wire::Message::Init(msg) => {
1069                                 if msg.features.requires_unknown_bits() {
1070                                         log_debug!(self.logger, "Peer features required unknown version bits");
1071                                         return Err(PeerHandleError{ no_connection_possible: true }.into());
1072                                 }
1073                                 if peer.their_features.is_some() {
1074                                         return Err(PeerHandleError{ no_connection_possible: false }.into());
1075                                 }
1076
1077                                 log_info!(self.logger, "Received peer Init message from {}: {}", log_pubkey!(peer.their_node_id.unwrap()), msg.features);
1078
1079                                 // For peers not supporting gossip queries start sync now, otherwise wait until we receive a filter.
1080                                 if msg.features.initial_routing_sync() && !msg.features.supports_gossip_queries() {
1081                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(0);
1082                                 }
1083                                 if !msg.features.supports_static_remote_key() {
1084                                         log_debug!(self.logger, "Peer {} does not support static remote key, disconnecting with no_connection_possible", log_pubkey!(peer.their_node_id.unwrap()));
1085                                         return Err(PeerHandleError{ no_connection_possible: true }.into());
1086                                 }
1087
1088                                 self.message_handler.route_handler.peer_connected(&peer.their_node_id.unwrap(), &msg);
1089
1090                                 self.message_handler.chan_handler.peer_connected(&peer.their_node_id.unwrap(), &msg);
1091                                 peer.their_features = Some(msg.features);
1092                         },
1093                         wire::Message::Error(msg) => {
1094                                 let mut data_is_printable = true;
1095                                 for b in msg.data.bytes() {
1096                                         if b < 32 || b > 126 {
1097                                                 data_is_printable = false;
1098                                                 break;
1099                                         }
1100                                 }
1101
1102                                 if data_is_printable {
1103                                         log_debug!(self.logger, "Got Err message from {}: {}", log_pubkey!(peer.their_node_id.unwrap()), msg.data);
1104                                 } else {
1105                                         log_debug!(self.logger, "Got Err message from {} with non-ASCII error message", log_pubkey!(peer.their_node_id.unwrap()));
1106                                 }
1107                                 self.message_handler.chan_handler.handle_error(&peer.their_node_id.unwrap(), &msg);
1108                                 if msg.channel_id == [0; 32] {
1109                                         return Err(PeerHandleError{ no_connection_possible: true }.into());
1110                                 }
1111                         },
1112                         wire::Message::Warning(msg) => {
1113                                 let mut data_is_printable = true;
1114                                 for b in msg.data.bytes() {
1115                                         if b < 32 || b > 126 {
1116                                                 data_is_printable = false;
1117                                                 break;
1118                                         }
1119                                 }
1120
1121                                 if data_is_printable {
1122                                         log_debug!(self.logger, "Got warning message from {}: {}", log_pubkey!(peer.their_node_id.unwrap()), msg.data);
1123                                 } else {
1124                                         log_debug!(self.logger, "Got warning message from {} with non-ASCII error message", log_pubkey!(peer.their_node_id.unwrap()));
1125                                 }
1126                         },
1127
1128                         wire::Message::Ping(msg) => {
1129                                 if msg.ponglen < 65532 {
1130                                         let resp = msgs::Pong { byteslen: msg.ponglen };
1131                                         self.enqueue_message(peer, &resp);
1132                                 }
1133                         },
1134                         wire::Message::Pong(_msg) => {
1135                                 peer.awaiting_pong_timer_tick_intervals = 0;
1136                                 peer.msgs_sent_since_pong = 0;
1137                         },
1138
1139                         // Channel messages:
1140                         wire::Message::OpenChannel(msg) => {
1141                                 self.message_handler.chan_handler.handle_open_channel(&peer.their_node_id.unwrap(), peer.their_features.clone().unwrap(), &msg);
1142                         },
1143                         wire::Message::AcceptChannel(msg) => {
1144                                 self.message_handler.chan_handler.handle_accept_channel(&peer.their_node_id.unwrap(), peer.their_features.clone().unwrap(), &msg);
1145                         },
1146
1147                         wire::Message::FundingCreated(msg) => {
1148                                 self.message_handler.chan_handler.handle_funding_created(&peer.their_node_id.unwrap(), &msg);
1149                         },
1150                         wire::Message::FundingSigned(msg) => {
1151                                 self.message_handler.chan_handler.handle_funding_signed(&peer.their_node_id.unwrap(), &msg);
1152                         },
1153                         wire::Message::FundingLocked(msg) => {
1154                                 self.message_handler.chan_handler.handle_funding_locked(&peer.their_node_id.unwrap(), &msg);
1155                         },
1156
1157                         wire::Message::Shutdown(msg) => {
1158                                 self.message_handler.chan_handler.handle_shutdown(&peer.their_node_id.unwrap(), peer.their_features.as_ref().unwrap(), &msg);
1159                         },
1160                         wire::Message::ClosingSigned(msg) => {
1161                                 self.message_handler.chan_handler.handle_closing_signed(&peer.their_node_id.unwrap(), &msg);
1162                         },
1163
1164                         // Commitment messages:
1165                         wire::Message::UpdateAddHTLC(msg) => {
1166                                 self.message_handler.chan_handler.handle_update_add_htlc(&peer.their_node_id.unwrap(), &msg);
1167                         },
1168                         wire::Message::UpdateFulfillHTLC(msg) => {
1169                                 self.message_handler.chan_handler.handle_update_fulfill_htlc(&peer.their_node_id.unwrap(), &msg);
1170                         },
1171                         wire::Message::UpdateFailHTLC(msg) => {
1172                                 self.message_handler.chan_handler.handle_update_fail_htlc(&peer.their_node_id.unwrap(), &msg);
1173                         },
1174                         wire::Message::UpdateFailMalformedHTLC(msg) => {
1175                                 self.message_handler.chan_handler.handle_update_fail_malformed_htlc(&peer.their_node_id.unwrap(), &msg);
1176                         },
1177
1178                         wire::Message::CommitmentSigned(msg) => {
1179                                 self.message_handler.chan_handler.handle_commitment_signed(&peer.their_node_id.unwrap(), &msg);
1180                         },
1181                         wire::Message::RevokeAndACK(msg) => {
1182                                 self.message_handler.chan_handler.handle_revoke_and_ack(&peer.their_node_id.unwrap(), &msg);
1183                         },
1184                         wire::Message::UpdateFee(msg) => {
1185                                 self.message_handler.chan_handler.handle_update_fee(&peer.their_node_id.unwrap(), &msg);
1186                         },
1187                         wire::Message::ChannelReestablish(msg) => {
1188                                 self.message_handler.chan_handler.handle_channel_reestablish(&peer.their_node_id.unwrap(), &msg);
1189                         },
1190
1191                         // Routing messages:
1192                         wire::Message::AnnouncementSignatures(msg) => {
1193                                 self.message_handler.chan_handler.handle_announcement_signatures(&peer.their_node_id.unwrap(), &msg);
1194                         },
1195                         wire::Message::ChannelAnnouncement(msg) => {
1196                                 if self.message_handler.route_handler.handle_channel_announcement(&msg)
1197                                                 .map_err(|e| -> MessageHandlingError { e.into() })? {
1198                                         should_forward = Some(wire::Message::ChannelAnnouncement(msg));
1199                                 }
1200                         },
1201                         wire::Message::NodeAnnouncement(msg) => {
1202                                 if self.message_handler.route_handler.handle_node_announcement(&msg)
1203                                                 .map_err(|e| -> MessageHandlingError { e.into() })? {
1204                                         should_forward = Some(wire::Message::NodeAnnouncement(msg));
1205                                 }
1206                         },
1207                         wire::Message::ChannelUpdate(msg) => {
1208                                 self.message_handler.chan_handler.handle_channel_update(&peer.their_node_id.unwrap(), &msg);
1209                                 if self.message_handler.route_handler.handle_channel_update(&msg)
1210                                                 .map_err(|e| -> MessageHandlingError { e.into() })? {
1211                                         should_forward = Some(wire::Message::ChannelUpdate(msg));
1212                                 }
1213                         },
1214                         wire::Message::QueryShortChannelIds(msg) => {
1215                                 self.message_handler.route_handler.handle_query_short_channel_ids(&peer.their_node_id.unwrap(), msg)?;
1216                         },
1217                         wire::Message::ReplyShortChannelIdsEnd(msg) => {
1218                                 self.message_handler.route_handler.handle_reply_short_channel_ids_end(&peer.their_node_id.unwrap(), msg)?;
1219                         },
1220                         wire::Message::QueryChannelRange(msg) => {
1221                                 self.message_handler.route_handler.handle_query_channel_range(&peer.their_node_id.unwrap(), msg)?;
1222                         },
1223                         wire::Message::ReplyChannelRange(msg) => {
1224                                 self.message_handler.route_handler.handle_reply_channel_range(&peer.their_node_id.unwrap(), msg)?;
1225                         },
1226                         wire::Message::GossipTimestampFilter(_msg) => {
1227                                 // When supporting gossip messages, start inital gossip sync only after we receive
1228                                 // a GossipTimestampFilter
1229                                 if peer.their_features.as_ref().unwrap().supports_gossip_queries() &&
1230                                         !peer.sent_gossip_timestamp_filter {
1231                                         peer.sent_gossip_timestamp_filter = true;
1232                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(0);
1233                                 }
1234                         },
1235
1236                         // Unknown messages:
1237                         wire::Message::Unknown(type_id) if message.is_even() => {
1238                                 log_debug!(self.logger, "Received unknown even message of type {}, disconnecting peer!", type_id);
1239                                 // Fail the channel if message is an even, unknown type as per BOLT #1.
1240                                 return Err(PeerHandleError{ no_connection_possible: true }.into());
1241                         },
1242                         wire::Message::Unknown(type_id) => {
1243                                 log_trace!(self.logger, "Received unknown odd message of type {}, ignoring", type_id);
1244                         },
1245                         wire::Message::Custom(custom) => {
1246                                 self.custom_message_handler.handle_custom_message(custom, &peer.their_node_id.unwrap())?;
1247                         },
1248                 };
1249                 Ok(should_forward)
1250         }
1251
1252         fn forward_broadcast_msg(&self, peers: &PeerHolder<Descriptor>, msg: &wire::Message<<<CMH as core::ops::Deref>::Target as wire::CustomMessageReader>::CustomMessage>, except_node: Option<&PublicKey>) {
1253                 match msg {
1254                         wire::Message::ChannelAnnouncement(ref msg) => {
1255                                 log_gossip!(self.logger, "Sending message to all peers except {:?} or the announced channel's counterparties: {:?}", except_node, msg);
1256                                 let encoded_msg = encode_msg!(msg);
1257
1258                                 for (_, peer_mutex) in peers.peers.iter() {
1259                                         let mut peer = peer_mutex.lock().unwrap();
1260                                         if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1261                                                         !peer.should_forward_channel_announcement(msg.contents.short_channel_id) {
1262                                                 continue
1263                                         }
1264                                         if peer.pending_outbound_buffer.len() > OUTBOUND_BUFFER_LIMIT_DROP_GOSSIP
1265                                                 || peer.msgs_sent_since_pong > BUFFER_DRAIN_MSGS_PER_TICK * FORWARD_INIT_SYNC_BUFFER_LIMIT_RATIO
1266                                         {
1267                                                 log_gossip!(self.logger, "Skipping broadcast message to {:?} as its outbound buffer is full", peer.their_node_id);
1268                                                 continue;
1269                                         }
1270                                         if peer.their_node_id.as_ref() == Some(&msg.contents.node_id_1) ||
1271                                            peer.their_node_id.as_ref() == Some(&msg.contents.node_id_2) {
1272                                                 continue;
1273                                         }
1274                                         if except_node.is_some() && peer.their_node_id.as_ref() == except_node {
1275                                                 continue;
1276                                         }
1277                                         self.enqueue_encoded_message(&mut *peer, &encoded_msg);
1278                                 }
1279                         },
1280                         wire::Message::NodeAnnouncement(ref msg) => {
1281                                 log_gossip!(self.logger, "Sending message to all peers except {:?} or the announced node: {:?}", except_node, msg);
1282                                 let encoded_msg = encode_msg!(msg);
1283
1284                                 for (_, peer_mutex) in peers.peers.iter() {
1285                                         let mut peer = peer_mutex.lock().unwrap();
1286                                         if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1287                                                         !peer.should_forward_node_announcement(msg.contents.node_id) {
1288                                                 continue
1289                                         }
1290                                         if peer.pending_outbound_buffer.len() > OUTBOUND_BUFFER_LIMIT_DROP_GOSSIP
1291                                                 || peer.msgs_sent_since_pong > BUFFER_DRAIN_MSGS_PER_TICK * FORWARD_INIT_SYNC_BUFFER_LIMIT_RATIO
1292                                         {
1293                                                 log_gossip!(self.logger, "Skipping broadcast message to {:?} as its outbound buffer is full", peer.their_node_id);
1294                                                 continue;
1295                                         }
1296                                         if peer.their_node_id.as_ref() == Some(&msg.contents.node_id) {
1297                                                 continue;
1298                                         }
1299                                         if except_node.is_some() && peer.their_node_id.as_ref() == except_node {
1300                                                 continue;
1301                                         }
1302                                         self.enqueue_encoded_message(&mut *peer, &encoded_msg);
1303                                 }
1304                         },
1305                         wire::Message::ChannelUpdate(ref msg) => {
1306                                 log_gossip!(self.logger, "Sending message to all peers except {:?}: {:?}", except_node, msg);
1307                                 let encoded_msg = encode_msg!(msg);
1308
1309                                 for (_, peer_mutex) in peers.peers.iter() {
1310                                         let mut peer = peer_mutex.lock().unwrap();
1311                                         if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1312                                                         !peer.should_forward_channel_announcement(msg.contents.short_channel_id)  {
1313                                                 continue
1314                                         }
1315                                         if peer.pending_outbound_buffer.len() > OUTBOUND_BUFFER_LIMIT_DROP_GOSSIP
1316                                                 || peer.msgs_sent_since_pong > BUFFER_DRAIN_MSGS_PER_TICK * FORWARD_INIT_SYNC_BUFFER_LIMIT_RATIO
1317                                         {
1318                                                 log_gossip!(self.logger, "Skipping broadcast message to {:?} as its outbound buffer is full", peer.their_node_id);
1319                                                 continue;
1320                                         }
1321                                         if except_node.is_some() && peer.their_node_id.as_ref() == except_node {
1322                                                 continue;
1323                                         }
1324                                         self.enqueue_encoded_message(&mut *peer, &encoded_msg);
1325                                 }
1326                         },
1327                         _ => debug_assert!(false, "We shouldn't attempt to forward anything but gossip messages"),
1328                 }
1329         }
1330
1331         /// Checks for any events generated by our handlers and processes them. Includes sending most
1332         /// response messages as well as messages generated by calls to handler functions directly (eg
1333         /// functions like [`ChannelManager::process_pending_htlc_forwards`] or [`send_payment`]).
1334         ///
1335         /// May call [`send_data`] on [`SocketDescriptor`]s. Thus, be very careful with reentrancy
1336         /// issues!
1337         ///
1338         /// You don't have to call this function explicitly if you are using [`lightning-net-tokio`]
1339         /// or one of the other clients provided in our language bindings.
1340         ///
1341         /// [`send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
1342         /// [`ChannelManager::process_pending_htlc_forwards`]: crate::ln::channelmanager::ChannelManager::process_pending_htlc_forwards
1343         /// [`send_data`]: SocketDescriptor::send_data
1344         pub fn process_events(&self) {
1345                 {
1346                         // TODO: There are some DoS attacks here where you can flood someone's outbound send
1347                         // buffer by doing things like announcing channels on another node. We should be willing to
1348                         // drop optional-ish messages when send buffers get full!
1349
1350                         let mut peers_lock = self.peers.write().unwrap();
1351                         let mut events_generated = self.message_handler.chan_handler.get_and_clear_pending_msg_events();
1352                         events_generated.append(&mut self.message_handler.route_handler.get_and_clear_pending_msg_events());
1353                         let peers = &mut *peers_lock;
1354                         macro_rules! get_peer_for_forwarding {
1355                                 ($node_id: expr) => {
1356                                         {
1357                                                 match self.node_id_to_descriptor.lock().unwrap().get($node_id) {
1358                                                         Some(descriptor) => match peers.peers.get_mut(&descriptor) {
1359                                                                 Some(peer_mutex) => {
1360                                                                         let peer_lock = peer_mutex.lock().unwrap();
1361                                                                         if peer_lock.their_features.is_none() {
1362                                                                                 continue;
1363                                                                         }
1364                                                                         peer_lock
1365                                                                 },
1366                                                                 None => panic!("Inconsistent peers set state!"),
1367                                                         },
1368                                                         None => {
1369                                                                 continue;
1370                                                         },
1371                                                 }
1372                                         }
1373                                 }
1374                         }
1375                         for event in events_generated.drain(..) {
1376                                 match event {
1377                                         MessageSendEvent::SendAcceptChannel { ref node_id, ref msg } => {
1378                                                 log_debug!(self.logger, "Handling SendAcceptChannel event in peer_handler for node {} for channel {}",
1379                                                                 log_pubkey!(node_id),
1380                                                                 log_bytes!(msg.temporary_channel_id));
1381                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1382                                         },
1383                                         MessageSendEvent::SendOpenChannel { ref node_id, ref msg } => {
1384                                                 log_debug!(self.logger, "Handling SendOpenChannel event in peer_handler for node {} for channel {}",
1385                                                                 log_pubkey!(node_id),
1386                                                                 log_bytes!(msg.temporary_channel_id));
1387                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1388                                         },
1389                                         MessageSendEvent::SendFundingCreated { ref node_id, ref msg } => {
1390                                                 log_debug!(self.logger, "Handling SendFundingCreated event in peer_handler for node {} for channel {} (which becomes {})",
1391                                                                 log_pubkey!(node_id),
1392                                                                 log_bytes!(msg.temporary_channel_id),
1393                                                                 log_funding_channel_id!(msg.funding_txid, msg.funding_output_index));
1394                                                 // TODO: If the peer is gone we should generate a DiscardFunding event
1395                                                 // indicating to the wallet that they should just throw away this funding transaction
1396                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1397                                         },
1398                                         MessageSendEvent::SendFundingSigned { ref node_id, ref msg } => {
1399                                                 log_debug!(self.logger, "Handling SendFundingSigned event in peer_handler for node {} for channel {}",
1400                                                                 log_pubkey!(node_id),
1401                                                                 log_bytes!(msg.channel_id));
1402                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1403                                         },
1404                                         MessageSendEvent::SendFundingLocked { ref node_id, ref msg } => {
1405                                                 log_debug!(self.logger, "Handling SendFundingLocked event in peer_handler for node {} for channel {}",
1406                                                                 log_pubkey!(node_id),
1407                                                                 log_bytes!(msg.channel_id));
1408                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1409                                         },
1410                                         MessageSendEvent::SendAnnouncementSignatures { ref node_id, ref msg } => {
1411                                                 log_debug!(self.logger, "Handling SendAnnouncementSignatures event in peer_handler for node {} for channel {})",
1412                                                                 log_pubkey!(node_id),
1413                                                                 log_bytes!(msg.channel_id));
1414                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1415                                         },
1416                                         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 } } => {
1417                                                 log_debug!(self.logger, "Handling UpdateHTLCs event in peer_handler for node {} with {} adds, {} fulfills, {} fails for channel {}",
1418                                                                 log_pubkey!(node_id),
1419                                                                 update_add_htlcs.len(),
1420                                                                 update_fulfill_htlcs.len(),
1421                                                                 update_fail_htlcs.len(),
1422                                                                 log_bytes!(commitment_signed.channel_id));
1423                                                 let mut peer = get_peer_for_forwarding!(node_id);
1424                                                 for msg in update_add_htlcs {
1425                                                         self.enqueue_message(&mut *peer, msg);
1426                                                 }
1427                                                 for msg in update_fulfill_htlcs {
1428                                                         self.enqueue_message(&mut *peer, msg);
1429                                                 }
1430                                                 for msg in update_fail_htlcs {
1431                                                         self.enqueue_message(&mut *peer, msg);
1432                                                 }
1433                                                 for msg in update_fail_malformed_htlcs {
1434                                                         self.enqueue_message(&mut *peer, msg);
1435                                                 }
1436                                                 if let &Some(ref msg) = update_fee {
1437                                                         self.enqueue_message(&mut *peer, msg);
1438                                                 }
1439                                                 self.enqueue_message(&mut *peer, commitment_signed);
1440                                         },
1441                                         MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
1442                                                 log_debug!(self.logger, "Handling SendRevokeAndACK event in peer_handler for node {} for channel {}",
1443                                                                 log_pubkey!(node_id),
1444                                                                 log_bytes!(msg.channel_id));
1445                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1446                                         },
1447                                         MessageSendEvent::SendClosingSigned { ref node_id, ref msg } => {
1448                                                 log_debug!(self.logger, "Handling SendClosingSigned event in peer_handler for node {} for channel {}",
1449                                                                 log_pubkey!(node_id),
1450                                                                 log_bytes!(msg.channel_id));
1451                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1452                                         },
1453                                         MessageSendEvent::SendShutdown { ref node_id, ref msg } => {
1454                                                 log_debug!(self.logger, "Handling Shutdown event in peer_handler for node {} for channel {}",
1455                                                                 log_pubkey!(node_id),
1456                                                                 log_bytes!(msg.channel_id));
1457                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1458                                         },
1459                                         MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
1460                                                 log_debug!(self.logger, "Handling SendChannelReestablish event in peer_handler for node {} for channel {}",
1461                                                                 log_pubkey!(node_id),
1462                                                                 log_bytes!(msg.channel_id));
1463                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1464                                         },
1465                                         MessageSendEvent::BroadcastChannelAnnouncement { msg, update_msg } => {
1466                                                 log_debug!(self.logger, "Handling BroadcastChannelAnnouncement event in peer_handler for short channel id {}", msg.contents.short_channel_id);
1467                                                 match self.message_handler.route_handler.handle_channel_announcement(&msg) {
1468                                                         Ok(_) | Err(LightningError { action: msgs::ErrorAction::IgnoreDuplicateGossip, .. }) =>
1469                                                                 self.forward_broadcast_msg(peers, &wire::Message::ChannelAnnouncement(msg), None),
1470                                                         _ => {},
1471                                                 }
1472                                                 match self.message_handler.route_handler.handle_channel_update(&update_msg) {
1473                                                         Ok(_) | Err(LightningError { action: msgs::ErrorAction::IgnoreDuplicateGossip, .. }) =>
1474                                                                 self.forward_broadcast_msg(peers, &wire::Message::ChannelUpdate(update_msg), None),
1475                                                         _ => {},
1476                                                 }
1477                                         },
1478                                         MessageSendEvent::BroadcastNodeAnnouncement { msg } => {
1479                                                 log_debug!(self.logger, "Handling BroadcastNodeAnnouncement event in peer_handler");
1480                                                 match self.message_handler.route_handler.handle_node_announcement(&msg) {
1481                                                         Ok(_) | Err(LightningError { action: msgs::ErrorAction::IgnoreDuplicateGossip, .. }) =>
1482                                                                 self.forward_broadcast_msg(peers, &wire::Message::NodeAnnouncement(msg), None),
1483                                                         _ => {},
1484                                                 }
1485                                         },
1486                                         MessageSendEvent::BroadcastChannelUpdate { msg } => {
1487                                                 log_debug!(self.logger, "Handling BroadcastChannelUpdate event in peer_handler for short channel id {}", msg.contents.short_channel_id);
1488                                                 match self.message_handler.route_handler.handle_channel_update(&msg) {
1489                                                         Ok(_) | Err(LightningError { action: msgs::ErrorAction::IgnoreDuplicateGossip, .. }) =>
1490                                                                 self.forward_broadcast_msg(peers, &wire::Message::ChannelUpdate(msg), None),
1491                                                         _ => {},
1492                                                 }
1493                                         },
1494                                         MessageSendEvent::SendChannelUpdate { ref node_id, ref msg } => {
1495                                                 log_trace!(self.logger, "Handling SendChannelUpdate event in peer_handler for node {} for channel {}",
1496                                                                 log_pubkey!(node_id), msg.contents.short_channel_id);
1497                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1498                                         },
1499                                         MessageSendEvent::HandleError { ref node_id, ref action } => {
1500                                                 match *action {
1501                                                         msgs::ErrorAction::DisconnectPeer { ref msg } => {
1502                                                                 // Note that since we are holding the peers *write* lock we can
1503                                                                 // remove from node_id_to_descriptor immediately (as no other
1504                                                                 // thread can be holding the peer lock if we have the global write
1505                                                                 // lock).
1506                                                                 if let Some(mut descriptor) = self.node_id_to_descriptor.lock().unwrap().remove(node_id) {
1507                                                                         if let Some(peer_mutex) = peers.peers.remove(&descriptor) {
1508                                                                                 if let Some(ref msg) = *msg {
1509                                                                                         log_trace!(self.logger, "Handling DisconnectPeer HandleError event in peer_handler for node {} with message {}",
1510                                                                                                         log_pubkey!(node_id),
1511                                                                                                         msg.data);
1512                                                                                         let mut peer = peer_mutex.lock().unwrap();
1513                                                                                         self.enqueue_message(&mut *peer, msg);
1514                                                                                         // This isn't guaranteed to work, but if there is enough free
1515                                                                                         // room in the send buffer, put the error message there...
1516                                                                                         self.do_attempt_write_data(&mut descriptor, &mut *peer);
1517                                                                                 } else {
1518                                                                                         log_gossip!(self.logger, "Handling DisconnectPeer HandleError event in peer_handler for node {} with no message", log_pubkey!(node_id));
1519                                                                                 }
1520                                                                         }
1521                                                                         descriptor.disconnect_socket();
1522                                                                         self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1523                                                                 }
1524                                                         },
1525                                                         msgs::ErrorAction::IgnoreAndLog(level) => {
1526                                                                 log_given_level!(self.logger, level, "Received a HandleError event to be ignored for node {}", log_pubkey!(node_id));
1527                                                         },
1528                                                         msgs::ErrorAction::IgnoreDuplicateGossip => {},
1529                                                         msgs::ErrorAction::IgnoreError => {
1530                                                                 log_debug!(self.logger, "Received a HandleError event to be ignored for node {}", log_pubkey!(node_id));
1531                                                         },
1532                                                         msgs::ErrorAction::SendErrorMessage { ref msg } => {
1533                                                                 log_trace!(self.logger, "Handling SendErrorMessage HandleError event in peer_handler for node {} with message {}",
1534                                                                                 log_pubkey!(node_id),
1535                                                                                 msg.data);
1536                                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1537                                                         },
1538                                                         msgs::ErrorAction::SendWarningMessage { ref msg, ref log_level } => {
1539                                                                 log_given_level!(self.logger, *log_level, "Handling SendWarningMessage HandleError event in peer_handler for node {} with message {}",
1540                                                                                 log_pubkey!(node_id),
1541                                                                                 msg.data);
1542                                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1543                                                         },
1544                                                 }
1545                                         },
1546                                         MessageSendEvent::SendChannelRangeQuery { ref node_id, ref msg } => {
1547                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1548                                         },
1549                                         MessageSendEvent::SendShortIdsQuery { ref node_id, ref msg } => {
1550                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1551                                         }
1552                                         MessageSendEvent::SendReplyChannelRange { ref node_id, ref msg } => {
1553                                                 log_gossip!(self.logger, "Handling SendReplyChannelRange event in peer_handler for node {} with num_scids={} first_blocknum={} number_of_blocks={}, sync_complete={}",
1554                                                         log_pubkey!(node_id),
1555                                                         msg.short_channel_ids.len(),
1556                                                         msg.first_blocknum,
1557                                                         msg.number_of_blocks,
1558                                                         msg.sync_complete);
1559                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1560                                         }
1561                                         MessageSendEvent::SendGossipTimestampFilter { ref node_id, ref msg } => {
1562                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1563                                         }
1564                                 }
1565                         }
1566
1567                         for (node_id, msg) in self.custom_message_handler.get_and_clear_pending_msg() {
1568                                 self.enqueue_message(&mut *get_peer_for_forwarding!(&node_id), &msg);
1569                         }
1570
1571                         for (descriptor, peer_mutex) in peers.peers.iter_mut() {
1572                                 self.do_attempt_write_data(&mut (*descriptor).clone(), &mut *peer_mutex.lock().unwrap());
1573                         }
1574                 }
1575         }
1576
1577         /// Indicates that the given socket descriptor's connection is now closed.
1578         pub fn socket_disconnected(&self, descriptor: &Descriptor) {
1579                 self.disconnect_event_internal(descriptor, false);
1580         }
1581
1582         fn disconnect_event_internal(&self, descriptor: &Descriptor, no_connection_possible: bool) {
1583                 let mut peers = self.peers.write().unwrap();
1584                 let peer_option = peers.peers.remove(descriptor);
1585                 match peer_option {
1586                         None => {
1587                                 // This is most likely a simple race condition where the user found that the socket
1588                                 // was disconnected, then we told the user to `disconnect_socket()`, then they
1589                                 // called this method. Either way we're disconnected, return.
1590                         },
1591                         Some(peer_lock) => {
1592                                 let peer = peer_lock.lock().unwrap();
1593                                 match peer.their_node_id {
1594                                         Some(node_id) => {
1595                                                 log_trace!(self.logger,
1596                                                         "Handling disconnection of peer {}, with {}future connection to the peer possible.",
1597                                                         log_pubkey!(node_id), if no_connection_possible { "no " } else { "" });
1598                                                 self.node_id_to_descriptor.lock().unwrap().remove(&node_id);
1599                                                 self.message_handler.chan_handler.peer_disconnected(&node_id, no_connection_possible);
1600                                         },
1601                                         None => {}
1602                                 }
1603                         }
1604                 };
1605         }
1606
1607         /// Disconnect a peer given its node id.
1608         ///
1609         /// Set `no_connection_possible` to true to prevent any further connection with this peer,
1610         /// force-closing any channels we have with it.
1611         ///
1612         /// If a peer is connected, this will call [`disconnect_socket`] on the descriptor for the
1613         /// peer. Thus, be very careful about reentrancy issues.
1614         ///
1615         /// [`disconnect_socket`]: SocketDescriptor::disconnect_socket
1616         pub fn disconnect_by_node_id(&self, node_id: PublicKey, no_connection_possible: bool) {
1617                 let mut peers_lock = self.peers.write().unwrap();
1618                 if let Some(mut descriptor) = self.node_id_to_descriptor.lock().unwrap().remove(&node_id) {
1619                         log_trace!(self.logger, "Disconnecting peer with id {} due to client request", node_id);
1620                         peers_lock.peers.remove(&descriptor);
1621                         self.message_handler.chan_handler.peer_disconnected(&node_id, no_connection_possible);
1622                         descriptor.disconnect_socket();
1623                 }
1624         }
1625
1626         /// Disconnects all currently-connected peers. This is useful on platforms where there may be
1627         /// an indication that TCP sockets have stalled even if we weren't around to time them out
1628         /// using regular ping/pongs.
1629         pub fn disconnect_all_peers(&self) {
1630                 let mut peers_lock = self.peers.write().unwrap();
1631                 self.node_id_to_descriptor.lock().unwrap().clear();
1632                 let peers = &mut *peers_lock;
1633                 for (mut descriptor, peer) in peers.peers.drain() {
1634                         if let Some(node_id) = peer.lock().unwrap().their_node_id {
1635                                 log_trace!(self.logger, "Disconnecting peer with id {} due to client request to disconnect all peers", node_id);
1636                                 self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1637                         }
1638                         descriptor.disconnect_socket();
1639                 }
1640         }
1641
1642         /// This is called when we're blocked on sending additional gossip messages until we receive a
1643         /// pong. If we aren't waiting on a pong, we take this opportunity to send a ping (setting
1644         /// `awaiting_pong_timer_tick_intervals` to a special flag value to indicate this).
1645         fn maybe_send_extra_ping(&self, peer: &mut Peer) {
1646                 if peer.awaiting_pong_timer_tick_intervals == 0 {
1647                         peer.awaiting_pong_timer_tick_intervals = -1;
1648                         let ping = msgs::Ping {
1649                                 ponglen: 0,
1650                                 byteslen: 64,
1651                         };
1652                         self.enqueue_message(peer, &ping);
1653                 }
1654         }
1655
1656         /// Send pings to each peer and disconnect those which did not respond to the last round of
1657         /// pings.
1658         ///
1659         /// This may be called on any timescale you want, however, roughly once every ten seconds is
1660         /// preferred. The call rate determines both how often we send a ping to our peers and how much
1661         /// time they have to respond before we disconnect them.
1662         ///
1663         /// May call [`send_data`] on all [`SocketDescriptor`]s. Thus, be very careful with reentrancy
1664         /// issues!
1665         ///
1666         /// [`send_data`]: SocketDescriptor::send_data
1667         pub fn timer_tick_occurred(&self) {
1668                 let mut peers_lock = self.peers.write().unwrap();
1669                 {
1670                         let mut descriptors_needing_disconnect = Vec::new();
1671                         let peer_count = peers_lock.peers.len();
1672
1673                         peers_lock.peers.retain(|descriptor, peer_mutex| {
1674                                 let mut peer = peer_mutex.lock().unwrap();
1675                                 let mut do_disconnect_peer = false;
1676                                 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_node_id.is_none() {
1677                                         // The peer needs to complete its handshake before we can exchange messages. We
1678                                         // give peers one timer tick to complete handshake, reusing
1679                                         // `awaiting_pong_timer_tick_intervals` to track number of timer ticks taken
1680                                         // for handshake completion.
1681                                         if peer.awaiting_pong_timer_tick_intervals != 0 {
1682                                                 do_disconnect_peer = true;
1683                                         } else {
1684                                                 peer.awaiting_pong_timer_tick_intervals = 1;
1685                                                 return true;
1686                                         }
1687                                 }
1688
1689                                 if peer.awaiting_pong_timer_tick_intervals == -1 {
1690                                         // Magic value set in `maybe_send_extra_ping`.
1691                                         peer.awaiting_pong_timer_tick_intervals = 1;
1692                                         peer.received_message_since_timer_tick = false;
1693                                         return true;
1694                                 }
1695
1696                                 if do_disconnect_peer
1697                                         || (peer.awaiting_pong_timer_tick_intervals > 0 && !peer.received_message_since_timer_tick)
1698                                         || peer.awaiting_pong_timer_tick_intervals as u64 >
1699                                                 MAX_BUFFER_DRAIN_TICK_INTERVALS_PER_PEER as u64 * peer_count as u64
1700                                 {
1701                                         descriptors_needing_disconnect.push(descriptor.clone());
1702                                         match peer.their_node_id {
1703                                                 Some(node_id) => {
1704                                                         log_trace!(self.logger, "Disconnecting peer with id {} due to ping timeout", node_id);
1705                                                         self.node_id_to_descriptor.lock().unwrap().remove(&node_id);
1706                                                         self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1707                                                 }
1708                                                 None => {},
1709                                         }
1710                                         return false;
1711                                 }
1712                                 peer.received_message_since_timer_tick = false;
1713
1714                                 if peer.awaiting_pong_timer_tick_intervals > 0 {
1715                                         peer.awaiting_pong_timer_tick_intervals += 1;
1716                                         return true;
1717                                 }
1718
1719                                 peer.awaiting_pong_timer_tick_intervals = 1;
1720                                 let ping = msgs::Ping {
1721                                         ponglen: 0,
1722                                         byteslen: 64,
1723                                 };
1724                                 self.enqueue_message(&mut *peer, &ping);
1725                                 self.do_attempt_write_data(&mut (descriptor.clone()), &mut *peer);
1726
1727                                 true
1728                         });
1729
1730                         for mut descriptor in descriptors_needing_disconnect.drain(..) {
1731                                 descriptor.disconnect_socket();
1732                         }
1733                 }
1734         }
1735 }
1736
1737 fn is_gossip_msg(type_id: u16) -> bool {
1738         match type_id {
1739                 msgs::ChannelAnnouncement::TYPE |
1740                 msgs::ChannelUpdate::TYPE |
1741                 msgs::NodeAnnouncement::TYPE |
1742                 msgs::QueryChannelRange::TYPE |
1743                 msgs::ReplyChannelRange::TYPE |
1744                 msgs::QueryShortChannelIds::TYPE |
1745                 msgs::ReplyShortChannelIdsEnd::TYPE => true,
1746                 _ => false
1747         }
1748 }
1749
1750 #[cfg(test)]
1751 mod tests {
1752         use ln::peer_handler::{PeerManager, MessageHandler, SocketDescriptor, IgnoringMessageHandler, filter_addresses};
1753         use ln::msgs;
1754         use ln::msgs::NetAddress;
1755         use util::events;
1756         use util::test_utils;
1757
1758         use bitcoin::secp256k1::Secp256k1;
1759         use bitcoin::secp256k1::key::{SecretKey, PublicKey};
1760
1761         use prelude::*;
1762         use sync::{Arc, Mutex};
1763         use core::sync::atomic::Ordering;
1764
1765         #[derive(Clone)]
1766         struct FileDescriptor {
1767                 fd: u16,
1768                 outbound_data: Arc<Mutex<Vec<u8>>>,
1769         }
1770         impl PartialEq for FileDescriptor {
1771                 fn eq(&self, other: &Self) -> bool {
1772                         self.fd == other.fd
1773                 }
1774         }
1775         impl Eq for FileDescriptor { }
1776         impl core::hash::Hash for FileDescriptor {
1777                 fn hash<H: core::hash::Hasher>(&self, hasher: &mut H) {
1778                         self.fd.hash(hasher)
1779                 }
1780         }
1781
1782         impl SocketDescriptor for FileDescriptor {
1783                 fn send_data(&mut self, data: &[u8], _resume_read: bool) -> usize {
1784                         self.outbound_data.lock().unwrap().extend_from_slice(data);
1785                         data.len()
1786                 }
1787
1788                 fn disconnect_socket(&mut self) {}
1789         }
1790
1791         struct PeerManagerCfg {
1792                 chan_handler: test_utils::TestChannelMessageHandler,
1793                 routing_handler: test_utils::TestRoutingMessageHandler,
1794                 logger: test_utils::TestLogger,
1795         }
1796
1797         fn create_peermgr_cfgs(peer_count: usize) -> Vec<PeerManagerCfg> {
1798                 let mut cfgs = Vec::new();
1799                 for _ in 0..peer_count {
1800                         cfgs.push(
1801                                 PeerManagerCfg{
1802                                         chan_handler: test_utils::TestChannelMessageHandler::new(),
1803                                         logger: test_utils::TestLogger::new(),
1804                                         routing_handler: test_utils::TestRoutingMessageHandler::new(),
1805                                 }
1806                         );
1807                 }
1808
1809                 cfgs
1810         }
1811
1812         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, IgnoringMessageHandler>> {
1813                 let mut peers = Vec::new();
1814                 for i in 0..peer_count {
1815                         let node_secret = SecretKey::from_slice(&[42 + i as u8; 32]).unwrap();
1816                         let ephemeral_bytes = [i as u8; 32];
1817                         let msg_handler = MessageHandler { chan_handler: &cfgs[i].chan_handler, route_handler: &cfgs[i].routing_handler };
1818                         let peer = PeerManager::new(msg_handler, node_secret, &ephemeral_bytes, &cfgs[i].logger, IgnoringMessageHandler {});
1819                         peers.push(peer);
1820                 }
1821
1822                 peers
1823         }
1824
1825         fn establish_connection<'a>(peer_a: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, &'a test_utils::TestLogger, IgnoringMessageHandler>, peer_b: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, &'a test_utils::TestLogger, IgnoringMessageHandler>) -> (FileDescriptor, FileDescriptor) {
1826                 let secp_ctx = Secp256k1::new();
1827                 let a_id = PublicKey::from_secret_key(&secp_ctx, &peer_a.our_node_secret);
1828                 let mut fd_a = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
1829                 let mut fd_b = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
1830                 let initial_data = peer_b.new_outbound_connection(a_id, fd_b.clone(), None).unwrap();
1831                 peer_a.new_inbound_connection(fd_a.clone(), None).unwrap();
1832                 assert_eq!(peer_a.read_event(&mut fd_a, &initial_data).unwrap(), false);
1833                 peer_a.process_events();
1834                 assert_eq!(peer_b.read_event(&mut fd_b, &fd_a.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1835                 peer_b.process_events();
1836                 assert_eq!(peer_a.read_event(&mut fd_a, &fd_b.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1837                 peer_a.process_events();
1838                 assert_eq!(peer_b.read_event(&mut fd_b, &fd_a.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1839                 (fd_a.clone(), fd_b.clone())
1840         }
1841
1842         #[test]
1843         fn test_disconnect_peer() {
1844                 // Simple test which builds a network of PeerManager, connects and brings them to NoiseState::Finished and
1845                 // push a DisconnectPeer event to remove the node flagged by id
1846                 let cfgs = create_peermgr_cfgs(2);
1847                 let chan_handler = test_utils::TestChannelMessageHandler::new();
1848                 let mut peers = create_network(2, &cfgs);
1849                 establish_connection(&peers[0], &peers[1]);
1850                 assert_eq!(peers[0].peers.read().unwrap().peers.len(), 1);
1851
1852                 let secp_ctx = Secp256k1::new();
1853                 let their_id = PublicKey::from_secret_key(&secp_ctx, &peers[1].our_node_secret);
1854
1855                 chan_handler.pending_events.lock().unwrap().push(events::MessageSendEvent::HandleError {
1856                         node_id: their_id,
1857                         action: msgs::ErrorAction::DisconnectPeer { msg: None },
1858                 });
1859                 assert_eq!(chan_handler.pending_events.lock().unwrap().len(), 1);
1860                 peers[0].message_handler.chan_handler = &chan_handler;
1861
1862                 peers[0].process_events();
1863                 assert_eq!(peers[0].peers.read().unwrap().peers.len(), 0);
1864         }
1865
1866         #[test]
1867         fn test_timer_tick_occurred() {
1868                 // Create peers, a vector of two peer managers, perform initial set up and check that peers[0] has one Peer.
1869                 let cfgs = create_peermgr_cfgs(2);
1870                 let peers = create_network(2, &cfgs);
1871                 establish_connection(&peers[0], &peers[1]);
1872                 assert_eq!(peers[0].peers.read().unwrap().peers.len(), 1);
1873
1874                 // peers[0] awaiting_pong is set to true, but the Peer is still connected
1875                 peers[0].timer_tick_occurred();
1876                 peers[0].process_events();
1877                 assert_eq!(peers[0].peers.read().unwrap().peers.len(), 1);
1878
1879                 // Since timer_tick_occurred() is called again when awaiting_pong is true, all Peers are disconnected
1880                 peers[0].timer_tick_occurred();
1881                 peers[0].process_events();
1882                 assert_eq!(peers[0].peers.read().unwrap().peers.len(), 0);
1883         }
1884
1885         #[test]
1886         fn test_do_attempt_write_data() {
1887                 // Create 2 peers with custom TestRoutingMessageHandlers and connect them.
1888                 let cfgs = create_peermgr_cfgs(2);
1889                 cfgs[0].routing_handler.request_full_sync.store(true, Ordering::Release);
1890                 cfgs[1].routing_handler.request_full_sync.store(true, Ordering::Release);
1891                 let peers = create_network(2, &cfgs);
1892
1893                 // By calling establish_connect, we trigger do_attempt_write_data between
1894                 // the peers. Previously this function would mistakenly enter an infinite loop
1895                 // when there were more channel messages available than could fit into a peer's
1896                 // buffer. This issue would now be detected by this test (because we use custom
1897                 // RoutingMessageHandlers that intentionally return more channel messages
1898                 // than can fit into a peer's buffer).
1899                 let (mut fd_a, mut fd_b) = establish_connection(&peers[0], &peers[1]);
1900
1901                 // Make each peer to read the messages that the other peer just wrote to them. Note that
1902                 // due to the max-message-before-ping limits this may take a few iterations to complete.
1903                 for _ in 0..150/super::BUFFER_DRAIN_MSGS_PER_TICK + 1 {
1904                         peers[1].process_events();
1905                         let a_read_data = fd_b.outbound_data.lock().unwrap().split_off(0);
1906                         assert!(!a_read_data.is_empty());
1907
1908                         peers[0].read_event(&mut fd_a, &a_read_data).unwrap();
1909                         peers[0].process_events();
1910
1911                         let b_read_data = fd_a.outbound_data.lock().unwrap().split_off(0);
1912                         assert!(!b_read_data.is_empty());
1913                         peers[1].read_event(&mut fd_b, &b_read_data).unwrap();
1914
1915                         peers[0].process_events();
1916                         assert_eq!(fd_a.outbound_data.lock().unwrap().len(), 0, "Until A receives data, it shouldn't send more messages");
1917                 }
1918
1919                 // Check that each peer has received the expected number of channel updates and channel
1920                 // announcements.
1921                 assert_eq!(cfgs[0].routing_handler.chan_upds_recvd.load(Ordering::Acquire), 100);
1922                 assert_eq!(cfgs[0].routing_handler.chan_anns_recvd.load(Ordering::Acquire), 50);
1923                 assert_eq!(cfgs[1].routing_handler.chan_upds_recvd.load(Ordering::Acquire), 100);
1924                 assert_eq!(cfgs[1].routing_handler.chan_anns_recvd.load(Ordering::Acquire), 50);
1925         }
1926
1927         #[test]
1928         fn test_handshake_timeout() {
1929                 // Tests that we time out a peer still waiting on handshake completion after a full timer
1930                 // tick.
1931                 let cfgs = create_peermgr_cfgs(2);
1932                 cfgs[0].routing_handler.request_full_sync.store(true, Ordering::Release);
1933                 cfgs[1].routing_handler.request_full_sync.store(true, Ordering::Release);
1934                 let peers = create_network(2, &cfgs);
1935
1936                 let secp_ctx = Secp256k1::new();
1937                 let a_id = PublicKey::from_secret_key(&secp_ctx, &peers[0].our_node_secret);
1938                 let mut fd_a = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
1939                 let mut fd_b = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
1940                 let initial_data = peers[1].new_outbound_connection(a_id, fd_b.clone(), None).unwrap();
1941                 peers[0].new_inbound_connection(fd_a.clone(), None).unwrap();
1942
1943                 // If we get a single timer tick before completion, that's fine
1944                 assert_eq!(peers[0].peers.read().unwrap().peers.len(), 1);
1945                 peers[0].timer_tick_occurred();
1946                 assert_eq!(peers[0].peers.read().unwrap().peers.len(), 1);
1947
1948                 assert_eq!(peers[0].read_event(&mut fd_a, &initial_data).unwrap(), false);
1949                 peers[0].process_events();
1950                 assert_eq!(peers[1].read_event(&mut fd_b, &fd_a.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1951                 peers[1].process_events();
1952
1953                 // ...but if we get a second timer tick, we should disconnect the peer
1954                 peers[0].timer_tick_occurred();
1955                 assert_eq!(peers[0].peers.read().unwrap().peers.len(), 0);
1956
1957                 assert!(peers[0].read_event(&mut fd_a, &fd_b.outbound_data.lock().unwrap().split_off(0)).is_err());
1958         }
1959
1960         #[test]
1961         fn test_filter_addresses(){
1962                 // Tests the filter_addresses function.
1963
1964                 // For (10/8)
1965                 let ip_address = NetAddress::IPv4{addr: [10, 0, 0, 0], port: 1000};
1966                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1967                 let ip_address = NetAddress::IPv4{addr: [10, 0, 255, 201], port: 1000};
1968                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1969                 let ip_address = NetAddress::IPv4{addr: [10, 255, 255, 255], port: 1000};
1970                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1971
1972                 // For (0/8)
1973                 let ip_address = NetAddress::IPv4{addr: [0, 0, 0, 0], port: 1000};
1974                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1975                 let ip_address = NetAddress::IPv4{addr: [0, 0, 255, 187], port: 1000};
1976                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1977                 let ip_address = NetAddress::IPv4{addr: [0, 255, 255, 255], port: 1000};
1978                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1979
1980                 // For (100.64/10)
1981                 let ip_address = NetAddress::IPv4{addr: [100, 64, 0, 0], port: 1000};
1982                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1983                 let ip_address = NetAddress::IPv4{addr: [100, 78, 255, 0], port: 1000};
1984                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1985                 let ip_address = NetAddress::IPv4{addr: [100, 127, 255, 255], port: 1000};
1986                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1987
1988                 // For (127/8)
1989                 let ip_address = NetAddress::IPv4{addr: [127, 0, 0, 0], port: 1000};
1990                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1991                 let ip_address = NetAddress::IPv4{addr: [127, 65, 73, 0], port: 1000};
1992                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1993                 let ip_address = NetAddress::IPv4{addr: [127, 255, 255, 255], port: 1000};
1994                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1995
1996                 // For (169.254/16)
1997                 let ip_address = NetAddress::IPv4{addr: [169, 254, 0, 0], port: 1000};
1998                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1999                 let ip_address = NetAddress::IPv4{addr: [169, 254, 221, 101], port: 1000};
2000                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2001                 let ip_address = NetAddress::IPv4{addr: [169, 254, 255, 255], port: 1000};
2002                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2003
2004                 // For (172.16/12)
2005                 let ip_address = NetAddress::IPv4{addr: [172, 16, 0, 0], port: 1000};
2006                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2007                 let ip_address = NetAddress::IPv4{addr: [172, 27, 101, 23], port: 1000};
2008                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2009                 let ip_address = NetAddress::IPv4{addr: [172, 31, 255, 255], port: 1000};
2010                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2011
2012                 // For (192.168/16)
2013                 let ip_address = NetAddress::IPv4{addr: [192, 168, 0, 0], port: 1000};
2014                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2015                 let ip_address = NetAddress::IPv4{addr: [192, 168, 205, 159], port: 1000};
2016                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2017                 let ip_address = NetAddress::IPv4{addr: [192, 168, 255, 255], port: 1000};
2018                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2019
2020                 // For (192.88.99/24)
2021                 let ip_address = NetAddress::IPv4{addr: [192, 88, 99, 0], port: 1000};
2022                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2023                 let ip_address = NetAddress::IPv4{addr: [192, 88, 99, 140], port: 1000};
2024                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2025                 let ip_address = NetAddress::IPv4{addr: [192, 88, 99, 255], port: 1000};
2026                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2027
2028                 // For other IPv4 addresses
2029                 let ip_address = NetAddress::IPv4{addr: [188, 255, 99, 0], port: 1000};
2030                 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2031                 let ip_address = NetAddress::IPv4{addr: [123, 8, 129, 14], port: 1000};
2032                 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2033                 let ip_address = NetAddress::IPv4{addr: [2, 88, 9, 255], port: 1000};
2034                 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2035
2036                 // For (2000::/3)
2037                 let ip_address = NetAddress::IPv6{addr: [32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], port: 1000};
2038                 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2039                 let ip_address = NetAddress::IPv6{addr: [45, 34, 209, 190, 0, 123, 55, 34, 0, 0, 3, 27, 201, 0, 0, 0], port: 1000};
2040                 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2041                 let ip_address = NetAddress::IPv6{addr: [63, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], port: 1000};
2042                 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2043
2044                 // For other IPv6 addresses
2045                 let ip_address = NetAddress::IPv6{addr: [24, 240, 12, 32, 0, 0, 0, 0, 20, 97, 0, 32, 121, 254, 0, 0], port: 1000};
2046                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2047                 let ip_address = NetAddress::IPv6{addr: [68, 23, 56, 63, 0, 0, 2, 7, 75, 109, 0, 39, 0, 0, 0, 0], port: 1000};
2048                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2049                 let ip_address = NetAddress::IPv6{addr: [101, 38, 140, 230, 100, 0, 30, 98, 0, 26, 0, 0, 57, 96, 0, 0], port: 1000};
2050                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2051
2052                 // For (None)
2053                 assert_eq!(filter_addresses(None), None);
2054         }
2055 }