_ 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 P2PGossipSync) with
  16 //! messages they should handle, and encoding/sending response messages.
  17
  18 use bitcoin::secp256k1::{self, Secp256k1, SecretKey, PublicKey};
  19
  20 use crate::chain::keysinterface::{KeysManager, NodeSigner, Recipient};
  21 use crate::ln::features::{InitFeatures, NodeFeatures};
  22 use crate::ln::msgs;
  23 use crate::ln::msgs::{ChannelMessageHandler, LightningError, NetAddress, OnionMessageHandler, RoutingMessageHandler};
  24 use crate::ln::channelmanager::{SimpleArcChannelManager, SimpleRefChannelManager};
  25 use crate::util::ser::{VecWriter, Writeable, Writer};
  26 use crate::ln::peer_channel_encryptor::{PeerChannelEncryptor,NextNoiseStep};
  27 use crate::ln::wire;
  28 use crate::ln::wire::Encode;
  29 use crate::onion_message::{CustomOnionMessageContents, CustomOnionMessageHandler, SimpleArcOnionMessenger, SimpleRefOnionMessenger};
  30 use crate::routing::gossip::{NetworkGraph, P2PGossipSync, NodeId};
  31 use crate::util::atomic_counter::AtomicCounter;
  32 use crate::util::events::{MessageSendEvent, MessageSendEventsProvider, OnionMessageProvider};
  33 use crate::util::logger::Logger;
  34
  35 use crate::prelude::*;
  36 use crate::io;
  37 use alloc::collections::LinkedList;
  38 use crate::sync::{Arc, Mutex, MutexGuard, FairRwLock};
  39 use core::sync::atomic::{AtomicBool, AtomicU32, Ordering};
  40 use core::{cmp, hash, fmt, mem};
  41 use core::ops::Deref;
  42 use core::convert::Infallible;
  43 #[cfg(feature = "std")] use std::error;
  44
  45 use bitcoin::hashes::sha256::Hash as Sha256;
  46 use bitcoin::hashes::sha256::HashEngine as Sha256Engine;
  47 use bitcoin::hashes::{HashEngine, Hash};
  48
  49 /// Handler for BOLT1-compliant messages.
  50 pub trait CustomMessageHandler: wire::CustomMessageReader {
  51         /// Called with the message type that was received and the buffer to be read.
  52         /// Can return a `MessageHandlingError` if the message could not be handled.
  53         fn handle_custom_message(&self, msg: Self::CustomMessage, sender_node_id: &PublicKey) -> Result<(), LightningError>;
  54
  55         /// Gets the list of pending messages which were generated by the custom message
  56         /// handler, clearing the list in the process. The first tuple element must
  57         /// correspond to the intended recipients node ids. If no connection to one of the
  58         /// specified node does not exist, the message is simply not sent to it.
  59         fn get_and_clear_pending_msg(&self) -> Vec<(PublicKey, Self::CustomMessage)>;
  60 }
  61
  62 /// A dummy struct which implements `RoutingMessageHandler` without storing any routing information
  63 /// or doing any processing. You can provide one of these as the route_handler in a MessageHandler.
  64 pub struct IgnoringMessageHandler{}
  65 impl MessageSendEventsProvider for IgnoringMessageHandler {
  66         fn get_and_clear_pending_msg_events(&self) -> Vec<MessageSendEvent> { Vec::new() }
  67 }
  68 impl RoutingMessageHandler for IgnoringMessageHandler {
  69         fn handle_node_announcement(&self, _msg: &msgs::NodeAnnouncement) -> Result<bool, LightningError> { Ok(false) }
  70         fn handle_channel_announcement(&self, _msg: &msgs::ChannelAnnouncement) -> Result<bool, LightningError> { Ok(false) }
  71         fn handle_channel_update(&self, _msg: &msgs::ChannelUpdate) -> Result<bool, LightningError> { Ok(false) }
  72         fn get_next_channel_announcement(&self, _starting_point: u64) ->
  73                 Option<(msgs::ChannelAnnouncement, Option<msgs::ChannelUpdate>, Option<msgs::ChannelUpdate>)> { None }
  74         fn get_next_node_announcement(&self, _starting_point: Option<&NodeId>) -> Option<msgs::NodeAnnouncement> { None }
  75         fn peer_connected(&self, _their_node_id: &PublicKey, _init: &msgs::Init) -> Result<(), ()> { Ok(()) }
  76         fn handle_reply_channel_range(&self, _their_node_id: &PublicKey, _msg: msgs::ReplyChannelRange) -> Result<(), LightningError> { Ok(()) }
  77         fn handle_reply_short_channel_ids_end(&self, _their_node_id: &PublicKey, _msg: msgs::ReplyShortChannelIdsEnd) -> Result<(), LightningError> { Ok(()) }
  78         fn handle_query_channel_range(&self, _their_node_id: &PublicKey, _msg: msgs::QueryChannelRange) -> Result<(), LightningError> { Ok(()) }
  79         fn handle_query_short_channel_ids(&self, _their_node_id: &PublicKey, _msg: msgs::QueryShortChannelIds) -> Result<(), LightningError> { Ok(()) }
  80         fn provided_node_features(&self) -> NodeFeatures { NodeFeatures::empty() }
  81         fn provided_init_features(&self, _their_node_id: &PublicKey) -> InitFeatures {
  82                 InitFeatures::empty()
  83         }
  84         fn processing_queue_high(&self) -> bool { false }
  85 }
  86 impl OnionMessageProvider for IgnoringMessageHandler {
  87         fn next_onion_message_for_peer(&self, _peer_node_id: PublicKey) -> Option<msgs::OnionMessage> { None }
  88 }
  89 impl OnionMessageHandler for IgnoringMessageHandler {
  90         fn handle_onion_message(&self, _their_node_id: &PublicKey, _msg: &msgs::OnionMessage) {}
  91         fn peer_connected(&self, _their_node_id: &PublicKey, _init: &msgs::Init) -> Result<(), ()> { Ok(()) }
  92         fn peer_disconnected(&self, _their_node_id: &PublicKey, _no_connection_possible: bool) {}
  93         fn provided_node_features(&self) -> NodeFeatures { NodeFeatures::empty() }
  94         fn provided_init_features(&self, _their_node_id: &PublicKey) -> InitFeatures {
  95                 InitFeatures::empty()
  96         }
  97 }
  98 impl CustomOnionMessageHandler for IgnoringMessageHandler {
  99         type CustomMessage = Infallible;
 100         fn handle_custom_message(&self, _msg: Infallible) {
 101                 // Since we always return `None` in the read the handle method should never be called.
 102                 unreachable!();
 103         }
 104         fn read_custom_message<R: io::Read>(&self, _msg_type: u64, _buffer: &mut R) -> Result<Option<Infallible>, msgs::DecodeError> where Self: Sized {
 105                 Ok(None)
 106         }
 107 }
 108
 109 impl CustomOnionMessageContents for Infallible {
 110         fn tlv_type(&self) -> u64 { unreachable!(); }
 111 }
 112
 113 impl Deref for IgnoringMessageHandler {
 114         type Target = IgnoringMessageHandler;
 115         fn deref(&self) -> &Self { self }
 116 }
 117
 118 // Implement Type for Infallible, note that it cannot be constructed, and thus you can never call a
 119 // method that takes self for it.
 120 impl wire::Type for Infallible {
 121         fn type_id(&self) -> u16 {
 122                 unreachable!();
 123         }
 124 }
 125 impl Writeable for Infallible {
 126         fn write<W: Writer>(&self, _: &mut W) -> Result<(), io::Error> {
 127                 unreachable!();
 128         }
 129 }
 130
 131 impl wire::CustomMessageReader for IgnoringMessageHandler {
 132         type CustomMessage = Infallible;
 133         fn read<R: io::Read>(&self, _message_type: u16, _buffer: &mut R) -> Result<Option<Self::CustomMessage>, msgs::DecodeError> {
 134                 Ok(None)
 135         }
 136 }
 137
 138 impl CustomMessageHandler for IgnoringMessageHandler {
 139         fn handle_custom_message(&self, _msg: Infallible, _sender_node_id: &PublicKey) -> Result<(), LightningError> {
 140                 // Since we always return `None` in the read the handle method should never be called.
 141                 unreachable!();
 142         }
 143
 144         fn get_and_clear_pending_msg(&self) -> Vec<(PublicKey, Self::CustomMessage)> { Vec::new() }
 145 }
 146
 147 /// A dummy struct which implements `ChannelMessageHandler` without having any channels.
 148 /// You can provide one of these as the route_handler in a MessageHandler.
 149 pub struct ErroringMessageHandler {
 150         message_queue: Mutex<Vec<MessageSendEvent>>
 151 }
 152 impl ErroringMessageHandler {
 153         /// Constructs a new ErroringMessageHandler
 154         pub fn new() -> Self {
 155                 Self { message_queue: Mutex::new(Vec::new()) }
 156         }
 157         fn push_error(&self, node_id: &PublicKey, channel_id: [u8; 32]) {
 158                 self.message_queue.lock().unwrap().push(MessageSendEvent::HandleError {
 159                         action: msgs::ErrorAction::SendErrorMessage {
 160                                 msg: msgs::ErrorMessage { channel_id, data: "We do not support channel messages, sorry.".to_owned() },
 161                         },
 162                         node_id: node_id.clone(),
 163                 });
 164         }
 165 }
 166 impl MessageSendEventsProvider for ErroringMessageHandler {
 167         fn get_and_clear_pending_msg_events(&self) -> Vec<MessageSendEvent> {
 168                 let mut res = Vec::new();
 169                 mem::swap(&mut res, &mut self.message_queue.lock().unwrap());
 170                 res
 171         }
 172 }
 173 impl ChannelMessageHandler for ErroringMessageHandler {
 174         // Any messages which are related to a specific channel generate an error message to let the
 175         // peer know we don't care about channels.
 176         fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &msgs::OpenChannel) {
 177                 ErroringMessageHandler::push_error(self, their_node_id, msg.temporary_channel_id);
 178         }
 179         fn handle_accept_channel(&self, their_node_id: &PublicKey, msg: &msgs::AcceptChannel) {
 180                 ErroringMessageHandler::push_error(self, their_node_id, msg.temporary_channel_id);
 181         }
 182         fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) {
 183                 ErroringMessageHandler::push_error(self, their_node_id, msg.temporary_channel_id);
 184         }
 185         fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) {
 186                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 187         }
 188         fn handle_channel_ready(&self, their_node_id: &PublicKey, msg: &msgs::ChannelReady) {
 189                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 190         }
 191         fn handle_shutdown(&self, their_node_id: &PublicKey, msg: &msgs::Shutdown) {
 192                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 193         }
 194         fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &msgs::ClosingSigned) {
 195                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 196         }
 197         fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) {
 198                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 199         }
 200         fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) {
 201                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 202         }
 203         fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) {
 204                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 205         }
 206         fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) {
 207                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 208         }
 209         fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) {
 210                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 211         }
 212         fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) {
 213                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 214         }
 215         fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) {
 216                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 217         }
 218         fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) {
 219                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 220         }
 221         fn handle_channel_reestablish(&self, their_node_id: &PublicKey, msg: &msgs::ChannelReestablish) {
 222                 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
 223         }
 224         // msgs::ChannelUpdate does not contain the channel_id field, so we just drop them.
 225         fn handle_channel_update(&self, _their_node_id: &PublicKey, _msg: &msgs::ChannelUpdate) {}
 226         fn peer_disconnected(&self, _their_node_id: &PublicKey, _no_connection_possible: bool) {}
 227         fn peer_connected(&self, _their_node_id: &PublicKey, _init: &msgs::Init) -> Result<(), ()> { Ok(()) }
 228         fn handle_error(&self, _their_node_id: &PublicKey, _msg: &msgs::ErrorMessage) {}
 229         fn provided_node_features(&self) -> NodeFeatures { NodeFeatures::empty() }
 230         fn provided_init_features(&self, _their_node_id: &PublicKey) -> InitFeatures {
 231                 // Set a number of features which various nodes may require to talk to us. It's totally
 232                 // reasonable to indicate we "support" all kinds of channel features...we just reject all
 233                 // channels.
 234                 let mut features = InitFeatures::empty();
 235                 features.set_data_loss_protect_optional();
 236                 features.set_upfront_shutdown_script_optional();
 237                 features.set_variable_length_onion_optional();
 238                 features.set_static_remote_key_optional();
 239                 features.set_payment_secret_optional();
 240                 features.set_basic_mpp_optional();
 241                 features.set_wumbo_optional();
 242                 features.set_shutdown_any_segwit_optional();
 243                 features.set_channel_type_optional();
 244                 features.set_scid_privacy_optional();
 245                 features.set_zero_conf_optional();
 246                 features
 247         }
 248 }
 249 impl Deref for ErroringMessageHandler {
 250         type Target = ErroringMessageHandler;
 251         fn deref(&self) -> &Self { self }
 252 }
 253
 254 /// Provides references to trait impls which handle different types of messages.
 255 pub struct MessageHandler<CM: Deref, RM: Deref, OM: Deref> where
 256                 CM::Target: ChannelMessageHandler,
 257                 RM::Target: RoutingMessageHandler,
 258                 OM::Target: OnionMessageHandler,
 259 {
 260         /// A message handler which handles messages specific to channels. Usually this is just a
 261         /// [`ChannelManager`] object or an [`ErroringMessageHandler`].
 262         ///
 263         /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
 264         pub chan_handler: CM,
 265         /// A message handler which handles messages updating our knowledge of the network channel
 266         /// graph. Usually this is just a [`P2PGossipSync`] object or an [`IgnoringMessageHandler`].
 267         ///
 268         /// [`P2PGossipSync`]: crate::routing::gossip::P2PGossipSync
 269         pub route_handler: RM,
 270
 271         /// A message handler which handles onion messages. For now, this can only be an
 272         /// [`IgnoringMessageHandler`].
 273         pub onion_message_handler: OM,
 274 }
 275
 276 /// Provides an object which can be used to send data to and which uniquely identifies a connection
 277 /// to a remote host. You will need to be able to generate multiple of these which meet Eq and
 278 /// implement Hash to meet the PeerManager API.
 279 ///
 280 /// For efficiency, Clone should be relatively cheap for this type.
 281 ///
 282 /// Two descriptors may compare equal (by [`cmp::Eq`] and [`hash::Hash`]) as long as the original
 283 /// has been disconnected, the [`PeerManager`] has been informed of the disconnection (either by it
 284 /// having triggered the disconnection or a call to [`PeerManager::socket_disconnected`]), and no
 285 /// further calls to the [`PeerManager`] related to the original socket occur. This allows you to
 286 /// use a file descriptor for your SocketDescriptor directly, however for simplicity you may wish
 287 /// to simply use another value which is guaranteed to be globally unique instead.
 288 pub trait SocketDescriptor : cmp::Eq + hash::Hash + Clone {
 289         /// Attempts to send some data from the given slice to the peer.
 290         ///
 291         /// Returns the amount of data which was sent, possibly 0 if the socket has since disconnected.
 292         /// Note that in the disconnected case, [`PeerManager::socket_disconnected`] must still be
 293         /// called and further write attempts may occur until that time.
 294         ///
 295         /// If the returned size is smaller than `data.len()`, a
 296         /// [`PeerManager::write_buffer_space_avail`] call must be made the next time more data can be
 297         /// written. Additionally, until a `send_data` event completes fully, no further
 298         /// [`PeerManager::read_event`] calls should be made for the same peer! Because this is to
 299         /// prevent denial-of-service issues, you should not read or buffer any data from the socket
 300         /// until then.
 301         ///
 302         /// If a [`PeerManager::read_event`] call on this descriptor had previously returned true
 303         /// (indicating that read events should be paused to prevent DoS in the send buffer),
 304         /// `resume_read` may be set indicating that read events on this descriptor should resume. A
 305         /// `resume_read` of false carries no meaning, and should not cause any action.
 306         fn send_data(&mut self, data: &[u8], resume_read: bool) -> usize;
 307         /// Disconnect the socket pointed to by this SocketDescriptor.
 308         ///
 309         /// You do *not* need to call [`PeerManager::socket_disconnected`] with this socket after this
 310         /// call (doing so is a noop).
 311         fn disconnect_socket(&mut self);
 312 }
 313
 314 /// Error for PeerManager errors. If you get one of these, you must disconnect the socket and
 315 /// generate no further read_event/write_buffer_space_avail/socket_disconnected calls for the
 316 /// descriptor.
 317 #[derive(Clone)]
 318 pub struct PeerHandleError {
 319         /// Used to indicate that we probably can't make any future connections to this peer (e.g.
 320         /// because we required features that our peer was missing, or vice versa).
 321         ///
 322         /// While LDK's [`ChannelManager`] will not do it automatically, you likely wish to force-close
 323         /// any channels with this peer or check for new versions of LDK.
 324         ///
 325         /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
 326         pub no_connection_possible: bool,
 327 }
 328 impl fmt::Debug for PeerHandleError {
 329         fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
 330                 formatter.write_str("Peer Sent Invalid Data")
 331         }
 332 }
 333 impl fmt::Display for PeerHandleError {
 334         fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
 335                 formatter.write_str("Peer Sent Invalid Data")
 336         }
 337 }
 338
 339 #[cfg(feature = "std")]
 340 impl error::Error for PeerHandleError {
 341         fn description(&self) -> &str {
 342                 "Peer Sent Invalid Data"
 343         }
 344 }
 345
 346 enum InitSyncTracker{
 347         NoSyncRequested,
 348         ChannelsSyncing(u64),
 349         NodesSyncing(NodeId),
 350 }
 351
 352 /// The ratio between buffer sizes at which we stop sending initial sync messages vs when we stop
 353 /// forwarding gossip messages to peers altogether.
 354 const FORWARD_INIT_SYNC_BUFFER_LIMIT_RATIO: usize = 2;
 355
 356 /// When the outbound buffer has this many messages, we'll stop reading bytes from the peer until
 357 /// we have fewer than this many messages in the outbound buffer again.
 358 /// We also use this as the target number of outbound gossip messages to keep in the write buffer,
 359 /// refilled as we send bytes.
 360 const OUTBOUND_BUFFER_LIMIT_READ_PAUSE: usize = 12;
 361 /// When the outbound buffer has this many messages, we'll simply skip relaying gossip messages to
 362 /// the peer.
 363 const OUTBOUND_BUFFER_LIMIT_DROP_GOSSIP: usize = OUTBOUND_BUFFER_LIMIT_READ_PAUSE * FORWARD_INIT_SYNC_BUFFER_LIMIT_RATIO;
 364
 365 /// If we've sent a ping, and are still awaiting a response, we may need to churn our way through
 366 /// the socket receive buffer before receiving the ping.
 367 ///
 368 /// On a fairly old Arm64 board, with Linux defaults, this can take as long as 20 seconds, not
 369 /// including any network delays, outbound traffic, or the same for messages from other peers.
 370 ///
 371 /// Thus, to avoid needlessly disconnecting a peer, we allow a peer to take this many timer ticks
 372 /// per connected peer to respond to a ping, as long as they send us at least one message during
 373 /// each tick, ensuring we aren't actually just disconnected.
 374 /// With a timer tick interval of ten seconds, this translates to about 40 seconds per connected
 375 /// peer.
 376 ///
 377 /// When we improve parallelism somewhat we should reduce this to e.g. this many timer ticks per
 378 /// two connected peers, assuming most LDK-running systems have at least two cores.
 379 const MAX_BUFFER_DRAIN_TICK_INTERVALS_PER_PEER: i8 = 4;
 380
 381 /// This is the minimum number of messages we expect a peer to be able to handle within one timer
 382 /// tick. Once we have sent this many messages since the last ping, we send a ping right away to
 383 /// ensures we don't just fill up our send buffer and leave the peer with too many messages to
 384 /// process before the next ping.
 385 ///
 386 /// Note that we continue responding to other messages even after we've sent this many messages, so
 387 /// it's more of a general guideline used for gossip backfill (and gossip forwarding, times
 388 /// [`FORWARD_INIT_SYNC_BUFFER_LIMIT_RATIO`]) than a hard limit.
 389 const BUFFER_DRAIN_MSGS_PER_TICK: usize = 32;
 390
 391 struct Peer {
 392         channel_encryptor: PeerChannelEncryptor,
 393         /// We cache a `NodeId` here to avoid serializing peers' keys every time we forward gossip
 394         /// messages in `PeerManager`. Use `Peer::set_their_node_id` to modify this field.
 395         their_node_id: Option<(PublicKey, NodeId)>,
 396         /// The features provided in the peer's [`msgs::Init`] message.
 397         ///
 398         /// This is set only after we've processed the [`msgs::Init`] message and called relevant
 399         /// `peer_connected` handler methods. Thus, this field is set *iff* we've finished our
 400         /// handshake and can talk to this peer normally (though use [`Peer::handshake_complete`] to
 401         /// check this.
 402         their_features: Option<InitFeatures>,
 403         their_net_address: Option<NetAddress>,
 404
 405         pending_outbound_buffer: LinkedList<Vec<u8>>,
 406         pending_outbound_buffer_first_msg_offset: usize,
 407         /// Queue gossip broadcasts separately from `pending_outbound_buffer` so we can easily
 408         /// prioritize channel messages over them.
 409         ///
 410         /// Note that these messages are *not* encrypted/MAC'd, and are only serialized.
 411         gossip_broadcast_buffer: LinkedList<Vec<u8>>,
 412         awaiting_write_event: bool,
 413
 414         pending_read_buffer: Vec<u8>,
 415         pending_read_buffer_pos: usize,
 416         pending_read_is_header: bool,
 417
 418         sync_status: InitSyncTracker,
 419
 420         msgs_sent_since_pong: usize,
 421         awaiting_pong_timer_tick_intervals: i8,
 422         received_message_since_timer_tick: bool,
 423         sent_gossip_timestamp_filter: bool,
 424
 425         /// Indicates we've received a `channel_announcement` since the last time we had
 426         /// [`PeerManager::gossip_processing_backlogged`] set (or, really, that we've received a
 427         /// `channel_announcement` at all - we set this unconditionally but unset it every time we
 428         /// check if we're gossip-processing-backlogged).
 429         received_channel_announce_since_backlogged: bool,
 430 }
 431
 432 impl Peer {
 433         /// True after we've processed the [`msgs::Init`] message and called relevant `peer_connected`
 434         /// handler methods. Thus, this implies we've finished our handshake and can talk to this peer
 435         /// normally.
 436         fn handshake_complete(&self) -> bool {
 437                 self.their_features.is_some()
 438         }
 439
 440         /// Returns true if the channel announcements/updates for the given channel should be
 441         /// forwarded to this peer.
 442         /// If we are sending our routing table to this peer and we have not yet sent channel
 443         /// announcements/updates for the given channel_id then we will send it when we get to that
 444         /// point and we shouldn't send it yet to avoid sending duplicate updates. If we've already
 445         /// sent the old versions, we should send the update, and so return true here.
 446         fn should_forward_channel_announcement(&self, channel_id: u64) -> bool {
 447                 if self.their_features.as_ref().unwrap().supports_gossip_queries() &&
 448                         !self.sent_gossip_timestamp_filter {
 449                                 return false;
 450                         }
 451                 match self.sync_status {
 452                         InitSyncTracker::NoSyncRequested => true,
 453                         InitSyncTracker::ChannelsSyncing(i) => i < channel_id,
 454                         InitSyncTracker::NodesSyncing(_) => true,
 455                 }
 456         }
 457
 458         /// Similar to the above, but for node announcements indexed by node_id.
 459         fn should_forward_node_announcement(&self, node_id: NodeId) -> bool {
 460                 if self.their_features.as_ref().unwrap().supports_gossip_queries() &&
 461                         !self.sent_gossip_timestamp_filter {
 462                                 return false;
 463                         }
 464                 match self.sync_status {
 465                         InitSyncTracker::NoSyncRequested => true,
 466                         InitSyncTracker::ChannelsSyncing(_) => false,
 467                         InitSyncTracker::NodesSyncing(sync_node_id) => sync_node_id.as_slice() < node_id.as_slice(),
 468                 }
 469         }
 470
 471         /// Returns whether we should be reading bytes from this peer, based on whether its outbound
 472         /// buffer still has space and we don't need to pause reads to get some writes out.
 473         fn should_read(&mut self, gossip_processing_backlogged: bool) -> bool {
 474                 if !gossip_processing_backlogged {
 475                         self.received_channel_announce_since_backlogged = false;
 476                 }
 477                 self.pending_outbound_buffer.len() < OUTBOUND_BUFFER_LIMIT_READ_PAUSE &&
 478                         (!gossip_processing_backlogged || !self.received_channel_announce_since_backlogged)
 479         }
 480
 481         /// Determines if we should push additional gossip background sync (aka "backfill") onto a peer's
 482         /// outbound buffer. This is checked every time the peer's buffer may have been drained.
 483         fn should_buffer_gossip_backfill(&self) -> bool {
 484                 self.pending_outbound_buffer.is_empty() && self.gossip_broadcast_buffer.is_empty()
 485                         && self.msgs_sent_since_pong < BUFFER_DRAIN_MSGS_PER_TICK
 486         }
 487
 488         /// Determines if we should push an onion message onto a peer's outbound buffer. This is checked
 489         /// every time the peer's buffer may have been drained.
 490         fn should_buffer_onion_message(&self) -> bool {
 491                 self.pending_outbound_buffer.is_empty()
 492                         && self.msgs_sent_since_pong < BUFFER_DRAIN_MSGS_PER_TICK
 493         }
 494
 495         /// Determines if we should push additional gossip broadcast messages onto a peer's outbound
 496         /// buffer. This is checked every time the peer's buffer may have been drained.
 497         fn should_buffer_gossip_broadcast(&self) -> bool {
 498                 self.pending_outbound_buffer.is_empty()
 499                         && self.msgs_sent_since_pong < BUFFER_DRAIN_MSGS_PER_TICK
 500         }
 501
 502         /// Returns whether this peer's outbound buffers are full and we should drop gossip broadcasts.
 503         fn buffer_full_drop_gossip_broadcast(&self) -> bool {
 504                 let total_outbound_buffered =
 505                         self.gossip_broadcast_buffer.len() + self.pending_outbound_buffer.len();
 506
 507                 total_outbound_buffered > OUTBOUND_BUFFER_LIMIT_DROP_GOSSIP ||
 508                         self.msgs_sent_since_pong > BUFFER_DRAIN_MSGS_PER_TICK * FORWARD_INIT_SYNC_BUFFER_LIMIT_RATIO
 509         }
 510
 511         fn set_their_node_id(&mut self, node_id: PublicKey) {
 512                 self.their_node_id = Some((node_id, NodeId::from_pubkey(&node_id)));
 513         }
 514 }
 515
 516 /// SimpleArcPeerManager is useful when you need a PeerManager with a static lifetime, e.g.
 517 /// when you're using lightning-net-tokio (since tokio::spawn requires parameters with static
 518 /// lifetimes). Other times you can afford a reference, which is more efficient, in which case
 519 /// SimpleRefPeerManager is the more appropriate type. Defining these type aliases prevents
 520 /// issues such as overly long function definitions.
 521 ///
 522 /// (C-not exported) as `Arc`s don't make sense in bindings.
 523 pub type SimpleArcPeerManager<SD, M, T, F, C, L> = PeerManager<SD, Arc<SimpleArcChannelManager<M, T, F, L>>, Arc<P2PGossipSync<Arc<NetworkGraph<Arc<L>>>, Arc<C>, Arc<L>>>, Arc<SimpleArcOnionMessenger<L>>, Arc<L>, IgnoringMessageHandler, Arc<KeysManager>>;
 524
 525 /// SimpleRefPeerManager is a type alias for a PeerManager reference, and is the reference
 526 /// counterpart to the SimpleArcPeerManager type alias. Use this type by default when you don't
 527 /// need a PeerManager with a static lifetime. You'll need a static lifetime in cases such as
 528 /// usage of lightning-net-tokio (since tokio::spawn requires parameters with static lifetimes).
 529 /// But if this is not necessary, using a reference is more efficient. Defining these type aliases
 530 /// helps with issues such as long function definitions.
 531 ///
 532 /// (C-not exported) as general type aliases don't make sense in bindings.
 533 pub type SimpleRefPeerManager<'a, 'b, 'c, 'd, 'e, 'f, 'g, 'h, 'i, 'j, 'k, 'l, 'm, SD, M, T, F, C, L> = PeerManager<SD, SimpleRefChannelManager<'a, 'b, 'c, 'd, 'e, 'f, 'g, 'm, M, T, F, L>, &'f P2PGossipSync<&'g NetworkGraph<&'f L>, &'h C, &'f L>, &'i SimpleRefOnionMessenger<'j, 'k, L>, &'f L, IgnoringMessageHandler, &'c KeysManager>;
 534
 535 /// A PeerManager manages a set of peers, described by their [`SocketDescriptor`] and marshalls
 536 /// socket events into messages which it passes on to its [`MessageHandler`].
 537 ///
 538 /// Locks are taken internally, so you must never assume that reentrancy from a
 539 /// [`SocketDescriptor`] call back into [`PeerManager`] methods will not deadlock.
 540 ///
 541 /// Calls to [`read_event`] will decode relevant messages and pass them to the
 542 /// [`ChannelMessageHandler`], likely doing message processing in-line. Thus, the primary form of
 543 /// parallelism in Rust-Lightning is in calls to [`read_event`]. Note, however, that calls to any
 544 /// [`PeerManager`] functions related to the same connection must occur only in serial, making new
 545 /// calls only after previous ones have returned.
 546 ///
 547 /// Rather than using a plain PeerManager, it is preferable to use either a SimpleArcPeerManager
 548 /// a SimpleRefPeerManager, for conciseness. See their documentation for more details, but
 549 /// essentially you should default to using a SimpleRefPeerManager, and use a
 550 /// SimpleArcPeerManager when you require a PeerManager with a static lifetime, such as when
 551 /// you're using lightning-net-tokio.
 552 ///
 553 /// [`read_event`]: PeerManager::read_event
 554 pub struct PeerManager<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, OM: Deref, L: Deref, CMH: Deref, NS: Deref> where
 555                 CM::Target: ChannelMessageHandler,
 556                 RM::Target: RoutingMessageHandler,
 557                 OM::Target: OnionMessageHandler,
 558                 L::Target: Logger,
 559                 CMH::Target: CustomMessageHandler,
 560                 NS::Target: NodeSigner {
 561         message_handler: MessageHandler<CM, RM, OM>,
 562         /// Connection state for each connected peer - we have an outer read-write lock which is taken
 563         /// as read while we're doing processing for a peer and taken write when a peer is being added
 564         /// or removed.
 565         ///
 566         /// The inner Peer lock is held for sending and receiving bytes, but note that we do *not* hold
 567         /// it while we're processing a message. This is fine as [`PeerManager::read_event`] requires
 568         /// that there be no parallel calls for a given peer, so mutual exclusion of messages handed to
 569         /// the `MessageHandler`s for a given peer is already guaranteed.
 570         peers: FairRwLock<HashMap<Descriptor, Mutex<Peer>>>,
 571         /// Only add to this set when noise completes.
 572         /// Locked *after* peers. When an item is removed, it must be removed with the `peers` write
 573         /// lock held. Entries may be added with only the `peers` read lock held (though the
 574         /// `Descriptor` value must already exist in `peers`).
 575         node_id_to_descriptor: Mutex<HashMap<PublicKey, Descriptor>>,
 576         /// We can only have one thread processing events at once, but we don't usually need the full
 577         /// `peers` write lock to do so, so instead we block on this empty mutex when entering
 578         /// `process_events`.
 579         event_processing_lock: Mutex<()>,
 580         /// Because event processing is global and always does all available work before returning,
 581         /// there is no reason for us to have many event processors waiting on the lock at once.
 582         /// Instead, we limit the total blocked event processors to always exactly one by setting this
 583         /// when an event process call is waiting.
 584         blocked_event_processors: AtomicBool,
 585
 586         /// Used to track the last value sent in a node_announcement "timestamp" field. We ensure this
 587         /// value increases strictly since we don't assume access to a time source.
 588         last_node_announcement_serial: AtomicU32,
 589
 590         ephemeral_key_midstate: Sha256Engine,
 591         custom_message_handler: CMH,
 592
 593         peer_counter: AtomicCounter,
 594
 595         gossip_processing_backlogged: AtomicBool,
 596         gossip_processing_backlog_lifted: AtomicBool,
 597
 598         node_signer: NS,
 599
 600         logger: L,
 601         secp_ctx: Secp256k1<secp256k1::SignOnly>
 602 }
 603
 604 enum MessageHandlingError {
 605         PeerHandleError(PeerHandleError),
 606         LightningError(LightningError),
 607 }
 608
 609 impl From<PeerHandleError> for MessageHandlingError {
 610         fn from(error: PeerHandleError) -> Self {
 611                 MessageHandlingError::PeerHandleError(error)
 612         }
 613 }
 614
 615 impl From<LightningError> for MessageHandlingError {
 616         fn from(error: LightningError) -> Self {
 617                 MessageHandlingError::LightningError(error)
 618         }
 619 }
 620
 621 macro_rules! encode_msg {
 622         ($msg: expr) => {{
 623                 let mut buffer = VecWriter(Vec::new());
 624                 wire::write($msg, &mut buffer).unwrap();
 625                 buffer.0
 626         }}
 627 }
 628
 629 impl<Descriptor: SocketDescriptor, CM: Deref, OM: Deref, L: Deref, NS: Deref> PeerManager<Descriptor, CM, IgnoringMessageHandler, OM, L, IgnoringMessageHandler, NS> where
 630                 CM::Target: ChannelMessageHandler,
 631                 OM::Target: OnionMessageHandler,
 632                 L::Target: Logger,
 633                 NS::Target: NodeSigner {
 634         /// Constructs a new `PeerManager` with the given `ChannelMessageHandler` and
 635         /// `OnionMessageHandler`. No routing message handler is used and network graph messages are
 636         /// ignored.
 637         ///
 638         /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
 639         /// cryptographically secure random bytes.
 640         ///
 641         /// `current_time` is used as an always-increasing counter that survives across restarts and is
 642         /// incremented irregularly internally. In general it is best to simply use the current UNIX
 643         /// timestamp, however if it is not available a persistent counter that increases once per
 644         /// minute should suffice.
 645         ///
 646         /// (C-not exported) as we can't export a PeerManager with a dummy route handler
 647         pub fn new_channel_only(channel_message_handler: CM, onion_message_handler: OM, current_time: u32, ephemeral_random_data: &[u8; 32], logger: L, node_signer: NS) -> Self {
 648                 Self::new(MessageHandler {
 649                         chan_handler: channel_message_handler,
 650                         route_handler: IgnoringMessageHandler{},
 651                         onion_message_handler,
 652                 }, current_time, ephemeral_random_data, logger, IgnoringMessageHandler{}, node_signer)
 653         }
 654 }
 655
 656 impl<Descriptor: SocketDescriptor, RM: Deref, L: Deref, NS: Deref> PeerManager<Descriptor, ErroringMessageHandler, RM, IgnoringMessageHandler, L, IgnoringMessageHandler, NS> where
 657                 RM::Target: RoutingMessageHandler,
 658                 L::Target: Logger,
 659                 NS::Target: NodeSigner {
 660         /// Constructs a new `PeerManager` with the given `RoutingMessageHandler`. No channel message
 661         /// handler or onion message handler is used and onion and channel messages will be ignored (or
 662         /// generate error messages). Note that some other lightning implementations time-out connections
 663         /// after some time if no channel is built with the peer.
 664         ///
 665         /// `current_time` is used as an always-increasing counter that survives across restarts and is
 666         /// incremented irregularly internally. In general it is best to simply use the current UNIX
 667         /// timestamp, however if it is not available a persistent counter that increases once per
 668         /// minute should suffice.
 669         ///
 670         /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
 671         /// cryptographically secure random bytes.
 672         ///
 673         /// (C-not exported) as we can't export a PeerManager with a dummy channel handler
 674         pub fn new_routing_only(routing_message_handler: RM, current_time: u32, ephemeral_random_data: &[u8; 32], logger: L, node_signer: NS) -> Self {
 675                 Self::new(MessageHandler {
 676                         chan_handler: ErroringMessageHandler::new(),
 677                         route_handler: routing_message_handler,
 678                         onion_message_handler: IgnoringMessageHandler{},
 679                 }, current_time, ephemeral_random_data, logger, IgnoringMessageHandler{}, node_signer)
 680         }
 681 }
 682
 683 /// A simple wrapper that optionally prints ` from <pubkey>` for an optional pubkey.
 684 /// This works around `format!()` taking a reference to each argument, preventing
 685 /// `if let Some(node_id) = peer.their_node_id { format!(.., node_id) } else { .. }` from compiling
 686 /// due to lifetime errors.
 687 struct OptionalFromDebugger<'a>(&'a Option<(PublicKey, NodeId)>);
 688 impl core::fmt::Display for OptionalFromDebugger<'_> {
 689         fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> Result<(), core::fmt::Error> {
 690                 if let Some((node_id, _)) = self.0 { write!(f, " from {}", log_pubkey!(node_id)) } else { Ok(()) }
 691         }
 692 }
 693
 694 /// A function used to filter out local or private addresses
 695 /// <https://www.iana.org./assignments/ipv4-address-space/ipv4-address-space.xhtml>
 696 /// <https://www.iana.org/assignments/ipv6-address-space/ipv6-address-space.xhtml>
 697 fn filter_addresses(ip_address: Option<NetAddress>) -> Option<NetAddress> {
 698         match ip_address{
 699                 // For IPv4 range 10.0.0.0 - 10.255.255.255 (10/8)
 700                 Some(NetAddress::IPv4{addr: [10, _, _, _], port: _}) => None,
 701                 // For IPv4 range 0.0.0.0 - 0.255.255.255 (0/8)
 702                 Some(NetAddress::IPv4{addr: [0, _, _, _], port: _}) => None,
 703                 // For IPv4 range 100.64.0.0 - 100.127.255.255 (100.64/10)
 704                 Some(NetAddress::IPv4{addr: [100, 64..=127, _, _], port: _}) => None,
 705                 // For IPv4 range       127.0.0.0 - 127.255.255.255 (127/8)
 706                 Some(NetAddress::IPv4{addr: [127, _, _, _], port: _}) => None,
 707                 // For IPv4 range       169.254.0.0 - 169.254.255.255 (169.254/16)
 708                 Some(NetAddress::IPv4{addr: [169, 254, _, _], port: _}) => None,
 709                 // For IPv4 range 172.16.0.0 - 172.31.255.255 (172.16/12)
 710                 Some(NetAddress::IPv4{addr: [172, 16..=31, _, _], port: _}) => None,
 711                 // For IPv4 range 192.168.0.0 - 192.168.255.255 (192.168/16)
 712                 Some(NetAddress::IPv4{addr: [192, 168, _, _], port: _}) => None,
 713                 // For IPv4 range 192.88.99.0 - 192.88.99.255  (192.88.99/24)
 714                 Some(NetAddress::IPv4{addr: [192, 88, 99, _], port: _}) => None,
 715                 // For IPv6 range 2000:0000:0000:0000:0000:0000:0000:0000 - 3fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff (2000::/3)
 716                 Some(NetAddress::IPv6{addr: [0x20..=0x3F, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _], port: _}) => ip_address,
 717                 // For remaining addresses
 718                 Some(NetAddress::IPv6{addr: _, port: _}) => None,
 719                 Some(..) => ip_address,
 720                 None => None,
 721         }
 722 }
 723
 724 impl<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, OM: Deref, L: Deref, CMH: Deref, NS: Deref> PeerManager<Descriptor, CM, RM, OM, L, CMH, NS> where
 725                 CM::Target: ChannelMessageHandler,
 726                 RM::Target: RoutingMessageHandler,
 727                 OM::Target: OnionMessageHandler,
 728                 L::Target: Logger,
 729                 CMH::Target: CustomMessageHandler,
 730                 NS::Target: NodeSigner
 731 {
 732         /// Constructs a new PeerManager with the given message handlers and node_id secret key
 733         /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
 734         /// cryptographically secure random bytes.
 735         ///
 736         /// `current_time` is used as an always-increasing counter that survives across restarts and is
 737         /// incremented irregularly internally. In general it is best to simply use the current UNIX
 738         /// timestamp, however if it is not available a persistent counter that increases once per
 739         /// minute should suffice.
 740         pub fn new(message_handler: MessageHandler<CM, RM, OM>, current_time: u32, ephemeral_random_data: &[u8; 32], logger: L, custom_message_handler: CMH, node_signer: NS) -> Self {
 741                 let mut ephemeral_key_midstate = Sha256::engine();
 742                 ephemeral_key_midstate.input(ephemeral_random_data);
 743
 744                 let mut secp_ctx = Secp256k1::signing_only();
 745                 let ephemeral_hash = Sha256::from_engine(ephemeral_key_midstate.clone()).into_inner();
 746                 secp_ctx.seeded_randomize(&ephemeral_hash);
 747
 748                 PeerManager {
 749                         message_handler,
 750                         peers: FairRwLock::new(HashMap::new()),
 751                         node_id_to_descriptor: Mutex::new(HashMap::new()),
 752                         event_processing_lock: Mutex::new(()),
 753                         blocked_event_processors: AtomicBool::new(false),
 754                         ephemeral_key_midstate,
 755                         peer_counter: AtomicCounter::new(),
 756                         gossip_processing_backlogged: AtomicBool::new(false),
 757                         gossip_processing_backlog_lifted: AtomicBool::new(false),
 758                         last_node_announcement_serial: AtomicU32::new(current_time),
 759                         logger,
 760                         custom_message_handler,
 761                         node_signer,
 762                         secp_ctx,
 763                 }
 764         }
 765
 766         /// Get a list of tuples mapping from node id to network addresses for peers which have
 767         /// completed the initial handshake.
 768         ///
 769         /// For outbound connections, the [`PublicKey`] will be the same as the `their_node_id` parameter
 770         /// passed in to [`Self::new_outbound_connection`], however entries will only appear once the initial
 771         /// handshake has completed and we are sure the remote peer has the private key for the given
 772         /// [`PublicKey`].
 773         ///
 774         /// The returned `Option`s will only be `Some` if an address had been previously given via
 775         /// [`Self::new_outbound_connection`] or [`Self::new_inbound_connection`].
 776         pub fn get_peer_node_ids(&self) -> Vec<(PublicKey, Option<NetAddress>)> {
 777                 let peers = self.peers.read().unwrap();
 778                 peers.values().filter_map(|peer_mutex| {
 779                         let p = peer_mutex.lock().unwrap();
 780                         if !p.channel_encryptor.is_ready_for_encryption() || p.their_features.is_none() ||
 781                                 p.their_node_id.is_none() {
 782                                 return None;
 783                         }
 784                         Some((p.their_node_id.unwrap().0, p.their_net_address.clone()))
 785                 }).collect()
 786         }
 787
 788         fn get_ephemeral_key(&self) -> SecretKey {
 789                 let mut ephemeral_hash = self.ephemeral_key_midstate.clone();
 790                 let counter = self.peer_counter.get_increment();
 791                 ephemeral_hash.input(&counter.to_le_bytes());
 792                 SecretKey::from_slice(&Sha256::from_engine(ephemeral_hash).into_inner()).expect("You broke SHA-256!")
 793         }
 794
 795         /// Indicates a new outbound connection has been established to a node with the given `node_id`
 796         /// and an optional remote network address.
 797         ///
 798         /// The remote network address adds the option to report a remote IP address back to a connecting
 799         /// peer using the init message.
 800         /// The user should pass the remote network address of the host they are connected to.
 801         ///
 802         /// If an `Err` is returned here you must disconnect the connection immediately.
 803         ///
 804         /// Returns a small number of bytes to send to the remote node (currently always 50).
 805         ///
 806         /// Panics if descriptor is duplicative with some other descriptor which has not yet been
 807         /// [`socket_disconnected()`].
 808         ///
 809         /// [`socket_disconnected()`]: PeerManager::socket_disconnected
 810         pub fn new_outbound_connection(&self, their_node_id: PublicKey, descriptor: Descriptor, remote_network_address: Option<NetAddress>) -> Result<Vec<u8>, PeerHandleError> {
 811                 let mut peer_encryptor = PeerChannelEncryptor::new_outbound(their_node_id.clone(), self.get_ephemeral_key());
 812                 let res = peer_encryptor.get_act_one(&self.secp_ctx).to_vec();
 813                 let pending_read_buffer = [0; 50].to_vec(); // Noise act two is 50 bytes
 814
 815                 let mut peers = self.peers.write().unwrap();
 816                 if peers.insert(descriptor, Mutex::new(Peer {
 817                         channel_encryptor: peer_encryptor,
 818                         their_node_id: None,
 819                         their_features: None,
 820                         their_net_address: remote_network_address,
 821
 822                         pending_outbound_buffer: LinkedList::new(),
 823                         pending_outbound_buffer_first_msg_offset: 0,
 824                         gossip_broadcast_buffer: LinkedList::new(),
 825                         awaiting_write_event: false,
 826
 827                         pending_read_buffer,
 828                         pending_read_buffer_pos: 0,
 829                         pending_read_is_header: false,
 830
 831                         sync_status: InitSyncTracker::NoSyncRequested,
 832
 833                         msgs_sent_since_pong: 0,
 834                         awaiting_pong_timer_tick_intervals: 0,
 835                         received_message_since_timer_tick: false,
 836                         sent_gossip_timestamp_filter: false,
 837
 838                         received_channel_announce_since_backlogged: false,
 839                 })).is_some() {
 840                         panic!("PeerManager driver duplicated descriptors!");
 841                 };
 842                 Ok(res)
 843         }
 844
 845         /// Indicates a new inbound connection has been established to a node with an optional remote
 846         /// network address.
 847         ///
 848         /// The remote network address adds the option to report a remote IP address back to a connecting
 849         /// peer using the init message.
 850         /// The user should pass the remote network address of the host they are connected to.
 851         ///
 852         /// May refuse the connection by returning an Err, but will never write bytes to the remote end
 853         /// (outbound connector always speaks first). If an `Err` is returned here you must disconnect
 854         /// the connection immediately.
 855         ///
 856         /// Panics if descriptor is duplicative with some other descriptor which has not yet been
 857         /// [`socket_disconnected()`].
 858         ///
 859         /// [`socket_disconnected()`]: PeerManager::socket_disconnected
 860         pub fn new_inbound_connection(&self, descriptor: Descriptor, remote_network_address: Option<NetAddress>) -> Result<(), PeerHandleError> {
 861                 let peer_encryptor = PeerChannelEncryptor::new_inbound(&self.node_signer);
 862                 let pending_read_buffer = [0; 50].to_vec(); // Noise act one is 50 bytes
 863
 864                 let mut peers = self.peers.write().unwrap();
 865                 if peers.insert(descriptor, Mutex::new(Peer {
 866                         channel_encryptor: peer_encryptor,
 867                         their_node_id: None,
 868                         their_features: None,
 869                         their_net_address: remote_network_address,
 870
 871                         pending_outbound_buffer: LinkedList::new(),
 872                         pending_outbound_buffer_first_msg_offset: 0,
 873                         gossip_broadcast_buffer: LinkedList::new(),
 874                         awaiting_write_event: false,
 875
 876                         pending_read_buffer,
 877                         pending_read_buffer_pos: 0,
 878                         pending_read_is_header: false,
 879
 880                         sync_status: InitSyncTracker::NoSyncRequested,
 881
 882                         msgs_sent_since_pong: 0,
 883                         awaiting_pong_timer_tick_intervals: 0,
 884                         received_message_since_timer_tick: false,
 885                         sent_gossip_timestamp_filter: false,
 886
 887                         received_channel_announce_since_backlogged: false,
 888                 })).is_some() {
 889                         panic!("PeerManager driver duplicated descriptors!");
 890                 };
 891                 Ok(())
 892         }
 893
 894         fn peer_should_read(&self, peer: &mut Peer) -> bool {
 895                 peer.should_read(self.gossip_processing_backlogged.load(Ordering::Relaxed))
 896         }
 897
 898         fn update_gossip_backlogged(&self) {
 899                 let new_state = self.message_handler.route_handler.processing_queue_high();
 900                 let prev_state = self.gossip_processing_backlogged.swap(new_state, Ordering::Relaxed);
 901                 if prev_state && !new_state {
 902                         self.gossip_processing_backlog_lifted.store(true, Ordering::Relaxed);
 903                 }
 904         }
 905
 906         fn do_attempt_write_data(&self, descriptor: &mut Descriptor, peer: &mut Peer, force_one_write: bool) {
 907                 let mut have_written = false;
 908                 while !peer.awaiting_write_event {
 909                         if peer.should_buffer_onion_message() {
 910                                 if let Some((peer_node_id, _)) = peer.their_node_id {
 911                                         if let Some(next_onion_message) =
 912                                                 self.message_handler.onion_message_handler.next_onion_message_for_peer(peer_node_id) {
 913                                                         self.enqueue_message(peer, &next_onion_message);
 914                                         }
 915                                 }
 916                         }
 917                         if peer.should_buffer_gossip_broadcast() {
 918                                 if let Some(msg) = peer.gossip_broadcast_buffer.pop_front() {
 919                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_buffer(&msg[..]));
 920                                 }
 921                         }
 922                         if peer.should_buffer_gossip_backfill() {
 923                                 match peer.sync_status {
 924                                         InitSyncTracker::NoSyncRequested => {},
 925                                         InitSyncTracker::ChannelsSyncing(c) if c < 0xffff_ffff_ffff_ffff => {
 926                                                 if let Some((announce, update_a_option, update_b_option)) =
 927                                                         self.message_handler.route_handler.get_next_channel_announcement(c)
 928                                                 {
 929                                                         self.enqueue_message(peer, &announce);
 930                                                         if let Some(update_a) = update_a_option {
 931                                                                 self.enqueue_message(peer, &update_a);
 932                                                         }
 933                                                         if let Some(update_b) = update_b_option {
 934                                                                 self.enqueue_message(peer, &update_b);
 935                                                         }
 936                                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(announce.contents.short_channel_id + 1);
 937                                                 } else {
 938                                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(0xffff_ffff_ffff_ffff);
 939                                                 }
 940                                         },
 941                                         InitSyncTracker::ChannelsSyncing(c) if c == 0xffff_ffff_ffff_ffff => {
 942                                                 if let Some(msg) = self.message_handler.route_handler.get_next_node_announcement(None) {
 943                                                         self.enqueue_message(peer, &msg);
 944                                                         peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
 945                                                 } else {
 946                                                         peer.sync_status = InitSyncTracker::NoSyncRequested;
 947                                                 }
 948                                         },
 949                                         InitSyncTracker::ChannelsSyncing(_) => unreachable!(),
 950                                         InitSyncTracker::NodesSyncing(sync_node_id) => {
 951                                                 if let Some(msg) = self.message_handler.route_handler.get_next_node_announcement(Some(&sync_node_id)) {
 952                                                         self.enqueue_message(peer, &msg);
 953                                                         peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
 954                                                 } else {
 955                                                         peer.sync_status = InitSyncTracker::NoSyncRequested;
 956                                                 }
 957                                         },
 958                                 }
 959                         }
 960                         if peer.msgs_sent_since_pong >= BUFFER_DRAIN_MSGS_PER_TICK {
 961                                 self.maybe_send_extra_ping(peer);
 962                         }
 963
 964                         let should_read = self.peer_should_read(peer);
 965                         let next_buff = match peer.pending_outbound_buffer.front() {
 966                                 None => {
 967                                         if force_one_write && !have_written {
 968                                                 if should_read {
 969                                                         let data_sent = descriptor.send_data(&[], should_read);
 970                                                         debug_assert_eq!(data_sent, 0, "Can't write more than no data");
 971                                                 }
 972                                         }
 973                                         return
 974                                 },
 975                                 Some(buff) => buff,
 976                         };
 977
 978                         let pending = &next_buff[peer.pending_outbound_buffer_first_msg_offset..];
 979                         let data_sent = descriptor.send_data(pending, should_read);
 980                         have_written = true;
 981                         peer.pending_outbound_buffer_first_msg_offset += data_sent;
 982                         if peer.pending_outbound_buffer_first_msg_offset == next_buff.len() {
 983                                 peer.pending_outbound_buffer_first_msg_offset = 0;
 984                                 peer.pending_outbound_buffer.pop_front();
 985                         } else {
 986                                 peer.awaiting_write_event = true;
 987                         }
 988                 }
 989         }
 990
 991         /// Indicates that there is room to write data to the given socket descriptor.
 992         ///
 993         /// May return an Err to indicate that the connection should be closed.
 994         ///
 995         /// May call [`send_data`] on the descriptor passed in (or an equal descriptor) before
 996         /// returning. Thus, be very careful with reentrancy issues! The invariants around calling
 997         /// [`write_buffer_space_avail`] in case a write did not fully complete must still hold - be
 998         /// ready to call `[write_buffer_space_avail`] again if a write call generated here isn't
 999         /// sufficient!
1000         ///
1001         /// [`send_data`]: SocketDescriptor::send_data
1002         /// [`write_buffer_space_avail`]: PeerManager::write_buffer_space_avail
1003         pub fn write_buffer_space_avail(&self, descriptor: &mut Descriptor) -> Result<(), PeerHandleError> {
1004                 let peers = self.peers.read().unwrap();
1005                 match peers.get(descriptor) {
1006                         None => {
1007                                 // This is most likely a simple race condition where the user found that the socket
1008                                 // was writeable, then we told the user to `disconnect_socket()`, then they called
1009                                 // this method. Return an error to make sure we get disconnected.
1010                                 return Err(PeerHandleError { no_connection_possible: false });
1011                         },
1012                         Some(peer_mutex) => {
1013                                 let mut peer = peer_mutex.lock().unwrap();
1014                                 peer.awaiting_write_event = false;
1015                                 self.do_attempt_write_data(descriptor, &mut peer, false);
1016                         }
1017                 };
1018                 Ok(())
1019         }
1020
1021         /// Indicates that data was read from the given socket descriptor.
1022         ///
1023         /// May return an Err to indicate that the connection should be closed.
1024         ///
1025         /// Will *not* call back into [`send_data`] on any descriptors to avoid reentrancy complexity.
1026         /// Thus, however, you should call [`process_events`] after any `read_event` to generate
1027         /// [`send_data`] calls to handle responses.
1028         ///
1029         /// If `Ok(true)` is returned, further read_events should not be triggered until a
1030         /// [`send_data`] call on this descriptor has `resume_read` set (preventing DoS issues in the
1031         /// send buffer).
1032         ///
1033         /// In order to avoid processing too many messages at once per peer, `data` should be on the
1034         /// order of 4KiB.
1035         ///
1036         /// [`send_data`]: SocketDescriptor::send_data
1037         /// [`process_events`]: PeerManager::process_events
1038         pub fn read_event(&self, peer_descriptor: &mut Descriptor, data: &[u8]) -> Result<bool, PeerHandleError> {
1039                 match self.do_read_event(peer_descriptor, data) {
1040                         Ok(res) => Ok(res),
1041                         Err(e) => {
1042                                 log_trace!(self.logger, "Peer sent invalid data or we decided to disconnect due to a protocol error");
1043                                 self.disconnect_event_internal(peer_descriptor, e.no_connection_possible);
1044                                 Err(e)
1045                         }
1046                 }
1047         }
1048
1049         /// Append a message to a peer's pending outbound/write buffer
1050         fn enqueue_message<M: wire::Type>(&self, peer: &mut Peer, message: &M) {
1051                 if is_gossip_msg(message.type_id()) {
1052                         log_gossip!(self.logger, "Enqueueing message {:?} to {}", message, log_pubkey!(peer.their_node_id.unwrap().0));
1053                 } else {
1054                         log_trace!(self.logger, "Enqueueing message {:?} to {}", message, log_pubkey!(peer.their_node_id.unwrap().0))
1055                 }
1056                 peer.msgs_sent_since_pong += 1;
1057                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(message));
1058         }
1059
1060         /// Append a message to a peer's pending outbound/write gossip broadcast buffer
1061         fn enqueue_encoded_gossip_broadcast(&self, peer: &mut Peer, encoded_message: Vec<u8>) {
1062                 peer.msgs_sent_since_pong += 1;
1063                 peer.gossip_broadcast_buffer.push_back(encoded_message);
1064         }
1065
1066         fn do_read_event(&self, peer_descriptor: &mut Descriptor, data: &[u8]) -> Result<bool, PeerHandleError> {
1067                 let mut pause_read = false;
1068                 let peers = self.peers.read().unwrap();
1069                 let mut msgs_to_forward = Vec::new();
1070                 let mut peer_node_id = None;
1071                 match peers.get(peer_descriptor) {
1072                         None => {
1073                                 // This is most likely a simple race condition where the user read some bytes
1074                                 // from the socket, then we told the user to `disconnect_socket()`, then they
1075                                 // called this method. Return an error to make sure we get disconnected.
1076                                 return Err(PeerHandleError { no_connection_possible: false });
1077                         },
1078                         Some(peer_mutex) => {
1079                                 let mut read_pos = 0;
1080                                 while read_pos < data.len() {
1081                                         macro_rules! try_potential_handleerror {
1082                                                 ($peer: expr, $thing: expr) => {
1083                                                         match $thing {
1084                                                                 Ok(x) => x,
1085                                                                 Err(e) => {
1086                                                                         match e.action {
1087                                                                                 msgs::ErrorAction::DisconnectPeer { msg: _ } => {
1088                                                                                         //TODO: Try to push msg
1089                                                                                         log_debug!(self.logger, "Error handling message{}; disconnecting peer with: {}", OptionalFromDebugger(&peer_node_id), e.err);
1090                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
1091                                                                                 },
1092                                                                                 msgs::ErrorAction::IgnoreAndLog(level) => {
1093                                                                                         log_given_level!(self.logger, level, "Error handling message{}; ignoring: {}", OptionalFromDebugger(&peer_node_id), e.err);
1094                                                                                         continue
1095                                                                                 },
1096                                                                                 msgs::ErrorAction::IgnoreDuplicateGossip => continue, // Don't even bother logging these
1097                                                                                 msgs::ErrorAction::IgnoreError => {
1098                                                                                         log_debug!(self.logger, "Error handling message{}; ignoring: {}", OptionalFromDebugger(&peer_node_id), e.err);
1099                                                                                         continue;
1100                                                                                 },
1101                                                                                 msgs::ErrorAction::SendErrorMessage { msg } => {
1102                                                                                         log_debug!(self.logger, "Error handling message{}; sending error message with: {}", OptionalFromDebugger(&peer_node_id), e.err);
1103                                                                                         self.enqueue_message($peer, &msg);
1104                                                                                         continue;
1105                                                                                 },
1106                                                                                 msgs::ErrorAction::SendWarningMessage { msg, log_level } => {
1107                                                                                         log_given_level!(self.logger, log_level, "Error handling message{}; sending warning message with: {}", OptionalFromDebugger(&peer_node_id), e.err);
1108                                                                                         self.enqueue_message($peer, &msg);
1109                                                                                         continue;
1110                                                                                 },
1111                                                                         }
1112                                                                 }
1113                                                         }
1114                                                 }
1115                                         }
1116
1117                                         let mut peer_lock = peer_mutex.lock().unwrap();
1118                                         let peer = &mut *peer_lock;
1119                                         let mut msg_to_handle = None;
1120                                         if peer_node_id.is_none() {
1121                                                 peer_node_id = peer.their_node_id.clone();
1122                                         }
1123
1124                                         assert!(peer.pending_read_buffer.len() > 0);
1125                                         assert!(peer.pending_read_buffer.len() > peer.pending_read_buffer_pos);
1126
1127                                         {
1128                                                 let data_to_copy = cmp::min(peer.pending_read_buffer.len() - peer.pending_read_buffer_pos, data.len() - read_pos);
1129                                                 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]);
1130                                                 read_pos += data_to_copy;
1131                                                 peer.pending_read_buffer_pos += data_to_copy;
1132                                         }
1133
1134                                         if peer.pending_read_buffer_pos == peer.pending_read_buffer.len() {
1135                                                 peer.pending_read_buffer_pos = 0;
1136
1137                                                 macro_rules! insert_node_id {
1138                                                         () => {
1139                                                                 match self.node_id_to_descriptor.lock().unwrap().entry(peer.their_node_id.unwrap().0) {
1140                                                                         hash_map::Entry::Occupied(_) => {
1141                                                                                 log_trace!(self.logger, "Got second connection with {}, closing", log_pubkey!(peer.their_node_id.unwrap().0));
1142                                                                                 peer.their_node_id = None; // Unset so that we don't generate a peer_disconnected event
1143                                                                                 return Err(PeerHandleError{ no_connection_possible: false })
1144                                                                         },
1145                                                                         hash_map::Entry::Vacant(entry) => {
1146                                                                                 log_debug!(self.logger, "Finished noise handshake for connection with {}", log_pubkey!(peer.their_node_id.unwrap().0));
1147                                                                                 entry.insert(peer_descriptor.clone())
1148                                                                         },
1149                                                                 };
1150                                                         }
1151                                                 }
1152
1153                                                 let next_step = peer.channel_encryptor.get_noise_step();
1154                                                 match next_step {
1155                                                         NextNoiseStep::ActOne => {
1156                                                                 let act_two = try_potential_handleerror!(peer, peer.channel_encryptor
1157                                                                         .process_act_one_with_keys(&peer.pending_read_buffer[..],
1158                                                                                 &self.node_signer, self.get_ephemeral_key(), &self.secp_ctx)).to_vec();
1159                                                                 peer.pending_outbound_buffer.push_back(act_two);
1160                                                                 peer.pending_read_buffer = [0; 66].to_vec(); // act three is 66 bytes long
1161                                                         },
1162                                                         NextNoiseStep::ActTwo => {
1163                                                                 let (act_three, their_node_id) = try_potential_handleerror!(peer,
1164                                                                         peer.channel_encryptor.process_act_two(&peer.pending_read_buffer[..],
1165                                                                                 &self.node_signer));
1166                                                                 peer.pending_outbound_buffer.push_back(act_three.to_vec());
1167                                                                 peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
1168                                                                 peer.pending_read_is_header = true;
1169
1170                                                                 peer.set_their_node_id(their_node_id);
1171                                                                 insert_node_id!();
1172                                                                 let features = self.message_handler.chan_handler.provided_init_features(&their_node_id)
1173                                                                         .or(self.message_handler.route_handler.provided_init_features(&their_node_id))
1174                                                                         .or(self.message_handler.onion_message_handler.provided_init_features(&their_node_id));
1175                                                                 let resp = msgs::Init { features, remote_network_address: filter_addresses(peer.their_net_address.clone()) };
1176                                                                 self.enqueue_message(peer, &resp);
1177                                                                 peer.awaiting_pong_timer_tick_intervals = 0;
1178                                                         },
1179                                                         NextNoiseStep::ActThree => {
1180                                                                 let their_node_id = try_potential_handleerror!(peer,
1181                                                                         peer.channel_encryptor.process_act_three(&peer.pending_read_buffer[..]));
1182                                                                 peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
1183                                                                 peer.pending_read_is_header = true;
1184                                                                 peer.set_their_node_id(their_node_id);
1185                                                                 insert_node_id!();
1186                                                                 let features = self.message_handler.chan_handler.provided_init_features(&their_node_id)
1187                                                                         .or(self.message_handler.route_handler.provided_init_features(&their_node_id))
1188                                                                         .or(self.message_handler.onion_message_handler.provided_init_features(&their_node_id));
1189                                                                 let resp = msgs::Init { features, remote_network_address: filter_addresses(peer.their_net_address.clone()) };
1190                                                                 self.enqueue_message(peer, &resp);
1191                                                                 peer.awaiting_pong_timer_tick_intervals = 0;
1192                                                         },
1193                                                         NextNoiseStep::NoiseComplete => {
1194                                                                 if peer.pending_read_is_header {
1195                                                                         let msg_len = try_potential_handleerror!(peer,
1196                                                                                 peer.channel_encryptor.decrypt_length_header(&peer.pending_read_buffer[..]));
1197                                                                         if peer.pending_read_buffer.capacity() > 8192 { peer.pending_read_buffer = Vec::new(); }
1198                                                                         peer.pending_read_buffer.resize(msg_len as usize + 16, 0);
1199                                                                         if msg_len < 2 { // Need at least the message type tag
1200                                                                                 return Err(PeerHandleError{ no_connection_possible: false });
1201                                                                         }
1202                                                                         peer.pending_read_is_header = false;
1203                                                                 } else {
1204                                                                         let msg_data = try_potential_handleerror!(peer,
1205                                                                                 peer.channel_encryptor.decrypt_message(&peer.pending_read_buffer[..]));
1206                                                                         assert!(msg_data.len() >= 2);
1207
1208                                                                         // Reset read buffer
1209                                                                         if peer.pending_read_buffer.capacity() > 8192 { peer.pending_read_buffer = Vec::new(); }
1210                                                                         peer.pending_read_buffer.resize(18, 0);
1211                                                                         peer.pending_read_is_header = true;
1212
1213                                                                         let mut reader = io::Cursor::new(&msg_data[..]);
1214                                                                         let message_result = wire::read(&mut reader, &*self.custom_message_handler);
1215                                                                         let message = match message_result {
1216                                                                                 Ok(x) => x,
1217                                                                                 Err(e) => {
1218                                                                                         match e {
1219                                                                                                 // Note that to avoid recursion we never call
1220                                                                                                 // `do_attempt_write_data` from here, causing
1221                                                                                                 // the messages enqueued here to not actually
1222                                                                                                 // be sent before the peer is disconnected.
1223                                                                                                 (msgs::DecodeError::UnknownRequiredFeature, Some(ty)) if is_gossip_msg(ty) => {
1224                                                                                                         log_gossip!(self.logger, "Got a channel/node announcement with an unknown required feature flag, you may want to update!");
1225                                                                                                         continue;
1226                                                                                                 }
1227                                                                                                 (msgs::DecodeError::UnsupportedCompression, _) => {
1228                                                                                                         log_gossip!(self.logger, "We don't support zlib-compressed message fields, sending a warning and ignoring message");
1229                                                                                                         self.enqueue_message(peer, &msgs::WarningMessage { channel_id: [0; 32], data: "Unsupported message compression: zlib".to_owned() });
1230                                                                                                         continue;
1231                                                                                                 }
1232                                                                                                 (_, Some(ty)) if is_gossip_msg(ty) => {
1233                                                                                                         log_gossip!(self.logger, "Got an invalid value while deserializing a gossip message");
1234                                                                                                         self.enqueue_message(peer, &msgs::WarningMessage {
1235                                                                                                                 channel_id: [0; 32],
1236                                                                                                                 data: format!("Unreadable/bogus gossip message of type {}", ty),
1237                                                                                                         });
1238                                                                                                         continue;
1239                                                                                                 }
1240                                                                                                 (msgs::DecodeError::UnknownRequiredFeature, ty) => {
1241                                                                                                         log_gossip!(self.logger, "Received a message with an unknown required feature flag or TLV, you may want to update!");
1242                                                                                                         self.enqueue_message(peer, &msgs::WarningMessage { channel_id: [0; 32], data: format!("Received an unknown required feature/TLV in message type {:?}", ty) });
1243                                                                                                         return Err(PeerHandleError { no_connection_possible: false });
1244                                                                                                 }
1245                                                                                                 (msgs::DecodeError::UnknownVersion, _) => return Err(PeerHandleError { no_connection_possible: false }),
1246                                                                                                 (msgs::DecodeError::InvalidValue, _) => {
1247                                                                                                         log_debug!(self.logger, "Got an invalid value while deserializing message");
1248                                                                                                         return Err(PeerHandleError { no_connection_possible: false });
1249                                                                                                 }
1250                                                                                                 (msgs::DecodeError::ShortRead, _) => {
1251                                                                                                         log_debug!(self.logger, "Deserialization failed due to shortness of message");
1252                                                                                                         return Err(PeerHandleError { no_connection_possible: false });
1253                                                                                                 }
1254                                                                                                 (msgs::DecodeError::BadLengthDescriptor, _) => return Err(PeerHandleError { no_connection_possible: false }),
1255                                                                                                 (msgs::DecodeError::Io(_), _) => return Err(PeerHandleError { no_connection_possible: false }),
1256                                                                                         }
1257                                                                                 }
1258                                                                         };
1259
1260                                                                         msg_to_handle = Some(message);
1261                                                                 }
1262                                                         }
1263                                                 }
1264                                         }
1265                                         pause_read = !self.peer_should_read(peer);
1266
1267                                         if let Some(message) = msg_to_handle {
1268                                                 match self.handle_message(&peer_mutex, peer_lock, message) {
1269                                                         Err(handling_error) => match handling_error {
1270                                                                 MessageHandlingError::PeerHandleError(e) => { return Err(e) },
1271                                                                 MessageHandlingError::LightningError(e) => {
1272                                                                         try_potential_handleerror!(&mut peer_mutex.lock().unwrap(), Err(e));
1273                                                                 },
1274                                                         },
1275                                                         Ok(Some(msg)) => {
1276                                                                 msgs_to_forward.push(msg);
1277                                                         },
1278                                                         Ok(None) => {},
1279                                                 }
1280                                         }
1281                                 }
1282                         }
1283                 }
1284
1285                 for msg in msgs_to_forward.drain(..) {
1286                         self.forward_broadcast_msg(&*peers, &msg, peer_node_id.as_ref().map(|(pk, _)| pk));
1287                 }
1288
1289                 Ok(pause_read)
1290         }
1291
1292         /// Process an incoming message and return a decision (ok, lightning error, peer handling error) regarding the next action with the peer
1293         /// Returns the message back if it needs to be broadcasted to all other peers.
1294         fn handle_message(
1295                 &self,
1296                 peer_mutex: &Mutex<Peer>,
1297                 mut peer_lock: MutexGuard<Peer>,
1298                 message: wire::Message<<<CMH as core::ops::Deref>::Target as wire::CustomMessageReader>::CustomMessage>
1299         ) -> Result<Option<wire::Message<<<CMH as core::ops::Deref>::Target as wire::CustomMessageReader>::CustomMessage>>, MessageHandlingError> {
1300                 let their_node_id = peer_lock.their_node_id.clone().expect("We know the peer's public key by the time we receive messages").0;
1301                 peer_lock.received_message_since_timer_tick = true;
1302
1303                 // Need an Init as first message
1304                 if let wire::Message::Init(msg) = message {
1305                         if msg.features.requires_unknown_bits() {
1306                                 log_debug!(self.logger, "Peer features required unknown version bits");
1307                                 return Err(PeerHandleError{ no_connection_possible: true }.into());
1308                         }
1309                         if peer_lock.their_features.is_some() {
1310                                 return Err(PeerHandleError{ no_connection_possible: false }.into());
1311                         }
1312
1313                         log_info!(self.logger, "Received peer Init message from {}: {}", log_pubkey!(their_node_id), msg.features);
1314
1315                         // For peers not supporting gossip queries start sync now, otherwise wait until we receive a filter.
1316                         if msg.features.initial_routing_sync() && !msg.features.supports_gossip_queries() {
1317                                 peer_lock.sync_status = InitSyncTracker::ChannelsSyncing(0);
1318                         }
1319
1320                         if let Err(()) = self.message_handler.route_handler.peer_connected(&their_node_id, &msg) {
1321                                 log_debug!(self.logger, "Route Handler decided we couldn't communicate with peer {}", log_pubkey!(their_node_id));
1322                                 return Err(PeerHandleError{ no_connection_possible: true }.into());
1323                         }
1324                         if let Err(()) = self.message_handler.chan_handler.peer_connected(&their_node_id, &msg) {
1325                                 log_debug!(self.logger, "Channel Handler decided we couldn't communicate with peer {}", log_pubkey!(their_node_id));
1326                                 return Err(PeerHandleError{ no_connection_possible: true }.into());
1327                         }
1328                         if let Err(()) = self.message_handler.onion_message_handler.peer_connected(&their_node_id, &msg) {
1329                                 log_debug!(self.logger, "Onion Message Handler decided we couldn't communicate with peer {}", log_pubkey!(their_node_id));
1330                                 return Err(PeerHandleError{ no_connection_possible: true }.into());
1331                         }
1332
1333                         peer_lock.their_features = Some(msg.features);
1334                         return Ok(None);
1335                 } else if peer_lock.their_features.is_none() {
1336                         log_debug!(self.logger, "Peer {} sent non-Init first message", log_pubkey!(their_node_id));
1337                         return Err(PeerHandleError{ no_connection_possible: false }.into());
1338                 }
1339
1340                 if let wire::Message::GossipTimestampFilter(_msg) = message {
1341                         // When supporting gossip messages, start inital gossip sync only after we receive
1342                         // a GossipTimestampFilter
1343                         if peer_lock.their_features.as_ref().unwrap().supports_gossip_queries() &&
1344                                 !peer_lock.sent_gossip_timestamp_filter {
1345                                 peer_lock.sent_gossip_timestamp_filter = true;
1346                                 peer_lock.sync_status = InitSyncTracker::ChannelsSyncing(0);
1347                         }
1348                         return Ok(None);
1349                 }
1350
1351                 if let wire::Message::ChannelAnnouncement(ref _msg) = message {
1352                         peer_lock.received_channel_announce_since_backlogged = true;
1353                 }
1354
1355                 mem::drop(peer_lock);
1356
1357                 if is_gossip_msg(message.type_id()) {
1358                         log_gossip!(self.logger, "Received message {:?} from {}", message, log_pubkey!(their_node_id));
1359                 } else {
1360                         log_trace!(self.logger, "Received message {:?} from {}", message, log_pubkey!(their_node_id));
1361                 }
1362
1363                 let mut should_forward = None;
1364
1365                 match message {
1366                         // Setup and Control messages:
1367                         wire::Message::Init(_) => {
1368                                 // Handled above
1369                         },
1370                         wire::Message::GossipTimestampFilter(_) => {
1371                                 // Handled above
1372                         },
1373                         wire::Message::Error(msg) => {
1374                                 let mut data_is_printable = true;
1375                                 for b in msg.data.bytes() {
1376                                         if b < 32 || b > 126 {
1377                                                 data_is_printable = false;
1378                                                 break;
1379                                         }
1380                                 }
1381
1382                                 if data_is_printable {
1383                                         log_debug!(self.logger, "Got Err message from {}: {}", log_pubkey!(their_node_id), msg.data);
1384                                 } else {
1385                                         log_debug!(self.logger, "Got Err message from {} with non-ASCII error message", log_pubkey!(their_node_id));
1386                                 }
1387                                 self.message_handler.chan_handler.handle_error(&their_node_id, &msg);
1388                                 if msg.channel_id == [0; 32] {
1389                                         return Err(PeerHandleError{ no_connection_possible: true }.into());
1390                                 }
1391                         },
1392                         wire::Message::Warning(msg) => {
1393                                 let mut data_is_printable = true;
1394                                 for b in msg.data.bytes() {
1395                                         if b < 32 || b > 126 {
1396                                                 data_is_printable = false;
1397                                                 break;
1398                                         }
1399                                 }
1400
1401                                 if data_is_printable {
1402                                         log_debug!(self.logger, "Got warning message from {}: {}", log_pubkey!(their_node_id), msg.data);
1403                                 } else {
1404                                         log_debug!(self.logger, "Got warning message from {} with non-ASCII error message", log_pubkey!(their_node_id));
1405                                 }
1406                         },
1407
1408                         wire::Message::Ping(msg) => {
1409                                 if msg.ponglen < 65532 {
1410                                         let resp = msgs::Pong { byteslen: msg.ponglen };
1411                                         self.enqueue_message(&mut *peer_mutex.lock().unwrap(), &resp);
1412                                 }
1413                         },
1414                         wire::Message::Pong(_msg) => {
1415                                 let mut peer_lock = peer_mutex.lock().unwrap();
1416                                 peer_lock.awaiting_pong_timer_tick_intervals = 0;
1417                                 peer_lock.msgs_sent_since_pong = 0;
1418                         },
1419
1420                         // Channel messages:
1421                         wire::Message::OpenChannel(msg) => {
1422                                 self.message_handler.chan_handler.handle_open_channel(&their_node_id, &msg);
1423                         },
1424                         wire::Message::AcceptChannel(msg) => {
1425                                 self.message_handler.chan_handler.handle_accept_channel(&their_node_id, &msg);
1426                         },
1427
1428                         wire::Message::FundingCreated(msg) => {
1429                                 self.message_handler.chan_handler.handle_funding_created(&their_node_id, &msg);
1430                         },
1431                         wire::Message::FundingSigned(msg) => {
1432                                 self.message_handler.chan_handler.handle_funding_signed(&their_node_id, &msg);
1433                         },
1434                         wire::Message::ChannelReady(msg) => {
1435                                 self.message_handler.chan_handler.handle_channel_ready(&their_node_id, &msg);
1436                         },
1437
1438                         wire::Message::Shutdown(msg) => {
1439                                 self.message_handler.chan_handler.handle_shutdown(&their_node_id, &msg);
1440                         },
1441                         wire::Message::ClosingSigned(msg) => {
1442                                 self.message_handler.chan_handler.handle_closing_signed(&their_node_id, &msg);
1443                         },
1444
1445                         // Commitment messages:
1446                         wire::Message::UpdateAddHTLC(msg) => {
1447                                 self.message_handler.chan_handler.handle_update_add_htlc(&their_node_id, &msg);
1448                         },
1449                         wire::Message::UpdateFulfillHTLC(msg) => {
1450                                 self.message_handler.chan_handler.handle_update_fulfill_htlc(&their_node_id, &msg);
1451                         },
1452                         wire::Message::UpdateFailHTLC(msg) => {
1453                                 self.message_handler.chan_handler.handle_update_fail_htlc(&their_node_id, &msg);
1454                         },
1455                         wire::Message::UpdateFailMalformedHTLC(msg) => {
1456                                 self.message_handler.chan_handler.handle_update_fail_malformed_htlc(&their_node_id, &msg);
1457                         },
1458
1459                         wire::Message::CommitmentSigned(msg) => {
1460                                 self.message_handler.chan_handler.handle_commitment_signed(&their_node_id, &msg);
1461                         },
1462                         wire::Message::RevokeAndACK(msg) => {
1463                                 self.message_handler.chan_handler.handle_revoke_and_ack(&their_node_id, &msg);
1464                         },
1465                         wire::Message::UpdateFee(msg) => {
1466                                 self.message_handler.chan_handler.handle_update_fee(&their_node_id, &msg);
1467                         },
1468                         wire::Message::ChannelReestablish(msg) => {
1469                                 self.message_handler.chan_handler.handle_channel_reestablish(&their_node_id, &msg);
1470                         },
1471
1472                         // Routing messages:
1473                         wire::Message::AnnouncementSignatures(msg) => {
1474                                 self.message_handler.chan_handler.handle_announcement_signatures(&their_node_id, &msg);
1475                         },
1476                         wire::Message::ChannelAnnouncement(msg) => {
1477                                 if self.message_handler.route_handler.handle_channel_announcement(&msg)
1478                                                 .map_err(|e| -> MessageHandlingError { e.into() })? {
1479                                         should_forward = Some(wire::Message::ChannelAnnouncement(msg));
1480                                 }
1481                                 self.update_gossip_backlogged();
1482                         },
1483                         wire::Message::NodeAnnouncement(msg) => {
1484                                 if self.message_handler.route_handler.handle_node_announcement(&msg)
1485                                                 .map_err(|e| -> MessageHandlingError { e.into() })? {
1486                                         should_forward = Some(wire::Message::NodeAnnouncement(msg));
1487                                 }
1488                                 self.update_gossip_backlogged();
1489                         },
1490                         wire::Message::ChannelUpdate(msg) => {
1491                                 self.message_handler.chan_handler.handle_channel_update(&their_node_id, &msg);
1492                                 if self.message_handler.route_handler.handle_channel_update(&msg)
1493                                                 .map_err(|e| -> MessageHandlingError { e.into() })? {
1494                                         should_forward = Some(wire::Message::ChannelUpdate(msg));
1495                                 }
1496                                 self.update_gossip_backlogged();
1497                         },
1498                         wire::Message::QueryShortChannelIds(msg) => {
1499                                 self.message_handler.route_handler.handle_query_short_channel_ids(&their_node_id, msg)?;
1500                         },
1501                         wire::Message::ReplyShortChannelIdsEnd(msg) => {
1502                                 self.message_handler.route_handler.handle_reply_short_channel_ids_end(&their_node_id, msg)?;
1503                         },
1504                         wire::Message::QueryChannelRange(msg) => {
1505                                 self.message_handler.route_handler.handle_query_channel_range(&their_node_id, msg)?;
1506                         },
1507                         wire::Message::ReplyChannelRange(msg) => {
1508                                 self.message_handler.route_handler.handle_reply_channel_range(&their_node_id, msg)?;
1509                         },
1510
1511                         // Onion message:
1512                         wire::Message::OnionMessage(msg) => {
1513                                 self.message_handler.onion_message_handler.handle_onion_message(&their_node_id, &msg);
1514                         },
1515
1516                         // Unknown messages:
1517                         wire::Message::Unknown(type_id) if message.is_even() => {
1518                                 log_debug!(self.logger, "Received unknown even message of type {}, disconnecting peer!", type_id);
1519                                 // Fail the channel if message is an even, unknown type as per BOLT #1.
1520                                 return Err(PeerHandleError{ no_connection_possible: true }.into());
1521                         },
1522                         wire::Message::Unknown(type_id) => {
1523                                 log_trace!(self.logger, "Received unknown odd message of type {}, ignoring", type_id);
1524                         },
1525                         wire::Message::Custom(custom) => {
1526                                 self.custom_message_handler.handle_custom_message(custom, &their_node_id)?;
1527                         },
1528                 };
1529                 Ok(should_forward)
1530         }
1531
1532         fn forward_broadcast_msg(&self, peers: &HashMap<Descriptor, Mutex<Peer>>, msg: &wire::Message<<<CMH as core::ops::Deref>::Target as wire::CustomMessageReader>::CustomMessage>, except_node: Option<&PublicKey>) {
1533                 match msg {
1534                         wire::Message::ChannelAnnouncement(ref msg) => {
1535                                 log_gossip!(self.logger, "Sending message to all peers except {:?} or the announced channel's counterparties: {:?}", except_node, msg);
1536                                 let encoded_msg = encode_msg!(msg);
1537
1538                                 for (_, peer_mutex) in peers.iter() {
1539                                         let mut peer = peer_mutex.lock().unwrap();
1540                                         if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1541                                                         !peer.should_forward_channel_announcement(msg.contents.short_channel_id) {
1542                                                 continue
1543                                         }
1544                                         if peer.buffer_full_drop_gossip_broadcast() {
1545                                                 log_gossip!(self.logger, "Skipping broadcast message to {:?} as its outbound buffer is full", peer.their_node_id);
1546                                                 continue;
1547                                         }
1548                                         if let Some((_, their_node_id)) = peer.their_node_id {
1549                                                 if their_node_id == msg.contents.node_id_1 || their_node_id == msg.contents.node_id_2 {
1550                                                         continue;
1551                                                 }
1552                                         }
1553                                         if except_node.is_some() && peer.their_node_id.as_ref().map(|(pk, _)| pk) == except_node {
1554                                                 continue;
1555                                         }
1556                                         self.enqueue_encoded_gossip_broadcast(&mut *peer, encoded_msg.clone());
1557                                 }
1558                         },
1559                         wire::Message::NodeAnnouncement(ref msg) => {
1560                                 log_gossip!(self.logger, "Sending message to all peers except {:?} or the announced node: {:?}", except_node, msg);
1561                                 let encoded_msg = encode_msg!(msg);
1562
1563                                 for (_, peer_mutex) in peers.iter() {
1564                                         let mut peer = peer_mutex.lock().unwrap();
1565                                         if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1566                                                         !peer.should_forward_node_announcement(msg.contents.node_id) {
1567                                                 continue
1568                                         }
1569                                         if peer.buffer_full_drop_gossip_broadcast() {
1570                                                 log_gossip!(self.logger, "Skipping broadcast message to {:?} as its outbound buffer is full", peer.their_node_id);
1571                                                 continue;
1572                                         }
1573                                         if let Some((_, their_node_id)) = peer.their_node_id {
1574                                                 if their_node_id == msg.contents.node_id {
1575                                                         continue;
1576                                                 }
1577                                         }
1578                                         if except_node.is_some() && peer.their_node_id.as_ref().map(|(pk, _)| pk) == except_node {
1579                                                 continue;
1580                                         }
1581                                         self.enqueue_encoded_gossip_broadcast(&mut *peer, encoded_msg.clone());
1582                                 }
1583                         },
1584                         wire::Message::ChannelUpdate(ref msg) => {
1585                                 log_gossip!(self.logger, "Sending message to all peers except {:?}: {:?}", except_node, msg);
1586                                 let encoded_msg = encode_msg!(msg);
1587
1588                                 for (_, peer_mutex) in peers.iter() {
1589                                         let mut peer = peer_mutex.lock().unwrap();
1590                                         if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1591                                                         !peer.should_forward_channel_announcement(msg.contents.short_channel_id)  {
1592                                                 continue
1593                                         }
1594                                         if peer.buffer_full_drop_gossip_broadcast() {
1595                                                 log_gossip!(self.logger, "Skipping broadcast message to {:?} as its outbound buffer is full", peer.their_node_id);
1596                                                 continue;
1597                                         }
1598                                         if except_node.is_some() && peer.their_node_id.as_ref().map(|(pk, _)| pk) == except_node {
1599                                                 continue;
1600                                         }
1601                                         self.enqueue_encoded_gossip_broadcast(&mut *peer, encoded_msg.clone());
1602                                 }
1603                         },
1604                         _ => debug_assert!(false, "We shouldn't attempt to forward anything but gossip messages"),
1605                 }
1606         }
1607
1608         /// Checks for any events generated by our handlers and processes them. Includes sending most
1609         /// response messages as well as messages generated by calls to handler functions directly (eg
1610         /// functions like [`ChannelManager::process_pending_htlc_forwards`] or [`send_payment`]).
1611         ///
1612         /// May call [`send_data`] on [`SocketDescriptor`]s. Thus, be very careful with reentrancy
1613         /// issues!
1614         ///
1615         /// You don't have to call this function explicitly if you are using [`lightning-net-tokio`]
1616         /// or one of the other clients provided in our language bindings.
1617         ///
1618         /// Note that if there are any other calls to this function waiting on lock(s) this may return
1619         /// without doing any work. All available events that need handling will be handled before the
1620         /// other calls return.
1621         ///
1622         /// [`send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
1623         /// [`ChannelManager::process_pending_htlc_forwards`]: crate::ln::channelmanager::ChannelManager::process_pending_htlc_forwards
1624         /// [`send_data`]: SocketDescriptor::send_data
1625         pub fn process_events(&self) {
1626                 let mut _single_processor_lock = self.event_processing_lock.try_lock();
1627                 if _single_processor_lock.is_err() {
1628                         // While we could wake the older sleeper here with a CV and make more even waiting
1629                         // times, that would be a lot of overengineering for a simple "reduce total waiter
1630                         // count" goal.
1631                         match self.blocked_event_processors.compare_exchange(false, true, Ordering::AcqRel, Ordering::Acquire) {
1632                                 Err(val) => {
1633                                         debug_assert!(val, "compare_exchange failed spuriously?");
1634                                         return;
1635                                 },
1636                                 Ok(val) => {
1637                                         debug_assert!(!val, "compare_exchange succeeded spuriously?");
1638                                         // We're the only waiter, as the running process_events may have emptied the
1639                                         // pending events "long" ago and there are new events for us to process, wait until
1640                                         // its done and process any leftover events before returning.
1641                                         _single_processor_lock = Ok(self.event_processing_lock.lock().unwrap());
1642                                         self.blocked_event_processors.store(false, Ordering::Release);
1643                                 }
1644                         }
1645                 }
1646
1647                 self.update_gossip_backlogged();
1648                 let flush_read_disabled = self.gossip_processing_backlog_lifted.swap(false, Ordering::Relaxed);
1649
1650                 let mut peers_to_disconnect = HashMap::new();
1651                 let mut events_generated = self.message_handler.chan_handler.get_and_clear_pending_msg_events();
1652                 events_generated.append(&mut self.message_handler.route_handler.get_and_clear_pending_msg_events());
1653
1654                 {
1655                         // TODO: There are some DoS attacks here where you can flood someone's outbound send
1656                         // buffer by doing things like announcing channels on another node. We should be willing to
1657                         // drop optional-ish messages when send buffers get full!
1658
1659                         let peers_lock = self.peers.read().unwrap();
1660                         let peers = &*peers_lock;
1661                         macro_rules! get_peer_for_forwarding {
1662                                 ($node_id: expr) => {
1663                                         {
1664                                                 if peers_to_disconnect.get($node_id).is_some() {
1665                                                         // If we've "disconnected" this peer, do not send to it.
1666                                                         continue;
1667                                                 }
1668                                                 let descriptor_opt = self.node_id_to_descriptor.lock().unwrap().get($node_id).cloned();
1669                                                 match descriptor_opt {
1670                                                         Some(descriptor) => match peers.get(&descriptor) {
1671                                                                 Some(peer_mutex) => {
1672                                                                         let peer_lock = peer_mutex.lock().unwrap();
1673                                                                         if peer_lock.their_features.is_none() {
1674                                                                                 continue;
1675                                                                         }
1676                                                                         peer_lock
1677                                                                 },
1678                                                                 None => {
1679                                                                         debug_assert!(false, "Inconsistent peers set state!");
1680                                                                         continue;
1681                                                                 }
1682                                                         },
1683                                                         None => {
1684                                                                 continue;
1685                                                         },
1686                                                 }
1687                                         }
1688                                 }
1689                         }
1690                         for event in events_generated.drain(..) {
1691                                 match event {
1692                                         MessageSendEvent::SendAcceptChannel { ref node_id, ref msg } => {
1693                                                 log_debug!(self.logger, "Handling SendAcceptChannel event in peer_handler for node {} for channel {}",
1694                                                                 log_pubkey!(node_id),
1695                                                                 log_bytes!(msg.temporary_channel_id));
1696                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1697                                         },
1698                                         MessageSendEvent::SendOpenChannel { ref node_id, ref msg } => {
1699                                                 log_debug!(self.logger, "Handling SendOpenChannel event in peer_handler for node {} for channel {}",
1700                                                                 log_pubkey!(node_id),
1701                                                                 log_bytes!(msg.temporary_channel_id));
1702                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1703                                         },
1704                                         MessageSendEvent::SendFundingCreated { ref node_id, ref msg } => {
1705                                                 log_debug!(self.logger, "Handling SendFundingCreated event in peer_handler for node {} for channel {} (which becomes {})",
1706                                                                 log_pubkey!(node_id),
1707                                                                 log_bytes!(msg.temporary_channel_id),
1708                                                                 log_funding_channel_id!(msg.funding_txid, msg.funding_output_index));
1709                                                 // TODO: If the peer is gone we should generate a DiscardFunding event
1710                                                 // indicating to the wallet that they should just throw away this funding transaction
1711                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1712                                         },
1713                                         MessageSendEvent::SendFundingSigned { ref node_id, ref msg } => {
1714                                                 log_debug!(self.logger, "Handling SendFundingSigned event in peer_handler for node {} for channel {}",
1715                                                                 log_pubkey!(node_id),
1716                                                                 log_bytes!(msg.channel_id));
1717                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1718                                         },
1719                                         MessageSendEvent::SendChannelReady { ref node_id, ref msg } => {
1720                                                 log_debug!(self.logger, "Handling SendChannelReady event in peer_handler for node {} for channel {}",
1721                                                                 log_pubkey!(node_id),
1722                                                                 log_bytes!(msg.channel_id));
1723                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1724                                         },
1725                                         MessageSendEvent::SendAnnouncementSignatures { ref node_id, ref msg } => {
1726                                                 log_debug!(self.logger, "Handling SendAnnouncementSignatures event in peer_handler for node {} for channel {})",
1727                                                                 log_pubkey!(node_id),
1728                                                                 log_bytes!(msg.channel_id));
1729                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1730                                         },
1731                                         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 } } => {
1732                                                 log_debug!(self.logger, "Handling UpdateHTLCs event in peer_handler for node {} with {} adds, {} fulfills, {} fails for channel {}",
1733                                                                 log_pubkey!(node_id),
1734                                                                 update_add_htlcs.len(),
1735                                                                 update_fulfill_htlcs.len(),
1736                                                                 update_fail_htlcs.len(),
1737                                                                 log_bytes!(commitment_signed.channel_id));
1738                                                 let mut peer = get_peer_for_forwarding!(node_id);
1739                                                 for msg in update_add_htlcs {
1740                                                         self.enqueue_message(&mut *peer, msg);
1741                                                 }
1742                                                 for msg in update_fulfill_htlcs {
1743                                                         self.enqueue_message(&mut *peer, msg);
1744                                                 }
1745                                                 for msg in update_fail_htlcs {
1746                                                         self.enqueue_message(&mut *peer, msg);
1747                                                 }
1748                                                 for msg in update_fail_malformed_htlcs {
1749                                                         self.enqueue_message(&mut *peer, msg);
1750                                                 }
1751                                                 if let &Some(ref msg) = update_fee {
1752                                                         self.enqueue_message(&mut *peer, msg);
1753                                                 }
1754                                                 self.enqueue_message(&mut *peer, commitment_signed);
1755                                         },
1756                                         MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
1757                                                 log_debug!(self.logger, "Handling SendRevokeAndACK event in peer_handler for node {} for channel {}",
1758                                                                 log_pubkey!(node_id),
1759                                                                 log_bytes!(msg.channel_id));
1760                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1761                                         },
1762                                         MessageSendEvent::SendClosingSigned { ref node_id, ref msg } => {
1763                                                 log_debug!(self.logger, "Handling SendClosingSigned event in peer_handler for node {} for channel {}",
1764                                                                 log_pubkey!(node_id),
1765                                                                 log_bytes!(msg.channel_id));
1766                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1767                                         },
1768                                         MessageSendEvent::SendShutdown { ref node_id, ref msg } => {
1769                                                 log_debug!(self.logger, "Handling Shutdown event in peer_handler for node {} for channel {}",
1770                                                                 log_pubkey!(node_id),
1771                                                                 log_bytes!(msg.channel_id));
1772                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1773                                         },
1774                                         MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
1775                                                 log_debug!(self.logger, "Handling SendChannelReestablish event in peer_handler for node {} for channel {}",
1776                                                                 log_pubkey!(node_id),
1777                                                                 log_bytes!(msg.channel_id));
1778                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1779                                         },
1780                                         MessageSendEvent::SendChannelAnnouncement { ref node_id, ref msg, ref update_msg } => {
1781                                                 log_debug!(self.logger, "Handling SendChannelAnnouncement event in peer_handler for node {} for short channel id {}",
1782                                                                 log_pubkey!(node_id),
1783                                                                 msg.contents.short_channel_id);
1784                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1785                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), update_msg);
1786                                         },
1787                                         MessageSendEvent::BroadcastChannelAnnouncement { msg, update_msg } => {
1788                                                 log_debug!(self.logger, "Handling BroadcastChannelAnnouncement event in peer_handler for short channel id {}", msg.contents.short_channel_id);
1789                                                 match self.message_handler.route_handler.handle_channel_announcement(&msg) {
1790                                                         Ok(_) | Err(LightningError { action: msgs::ErrorAction::IgnoreDuplicateGossip, .. }) =>
1791                                                                 self.forward_broadcast_msg(peers, &wire::Message::ChannelAnnouncement(msg), None),
1792                                                         _ => {},
1793                                                 }
1794                                                 if let Some(msg) = update_msg {
1795                                                         match self.message_handler.route_handler.handle_channel_update(&msg) {
1796                                                                 Ok(_) | Err(LightningError { action: msgs::ErrorAction::IgnoreDuplicateGossip, .. }) =>
1797                                                                         self.forward_broadcast_msg(peers, &wire::Message::ChannelUpdate(msg), None),
1798                                                                 _ => {},
1799                                                         }
1800                                                 }
1801                                         },
1802                                         MessageSendEvent::BroadcastChannelUpdate { msg } => {
1803                                                 log_debug!(self.logger, "Handling BroadcastChannelUpdate event in peer_handler for short channel id {}", msg.contents.short_channel_id);
1804                                                 match self.message_handler.route_handler.handle_channel_update(&msg) {
1805                                                         Ok(_) | Err(LightningError { action: msgs::ErrorAction::IgnoreDuplicateGossip, .. }) =>
1806                                                                 self.forward_broadcast_msg(peers, &wire::Message::ChannelUpdate(msg), None),
1807                                                         _ => {},
1808                                                 }
1809                                         },
1810                                         MessageSendEvent::BroadcastNodeAnnouncement { msg } => {
1811                                                 log_debug!(self.logger, "Handling BroadcastNodeAnnouncement event in peer_handler for node {}", msg.contents.node_id);
1812                                                 match self.message_handler.route_handler.handle_node_announcement(&msg) {
1813                                                         Ok(_) | Err(LightningError { action: msgs::ErrorAction::IgnoreDuplicateGossip, .. }) =>
1814                                                                 self.forward_broadcast_msg(peers, &wire::Message::NodeAnnouncement(msg), None),
1815                                                         _ => {},
1816                                                 }
1817                                         },
1818                                         MessageSendEvent::SendChannelUpdate { ref node_id, ref msg } => {
1819                                                 log_trace!(self.logger, "Handling SendChannelUpdate event in peer_handler for node {} for channel {}",
1820                                                                 log_pubkey!(node_id), msg.contents.short_channel_id);
1821                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1822                                         },
1823                                         MessageSendEvent::HandleError { ref node_id, ref action } => {
1824                                                 match *action {
1825                                                         msgs::ErrorAction::DisconnectPeer { ref msg } => {
1826                                                                 // We do not have the peers write lock, so we just store that we're
1827                                                                 // about to disconenct the peer and do it after we finish
1828                                                                 // processing most messages.
1829                                                                 peers_to_disconnect.insert(*node_id, msg.clone());
1830                                                         },
1831                                                         msgs::ErrorAction::IgnoreAndLog(level) => {
1832                                                                 log_given_level!(self.logger, level, "Received a HandleError event to be ignored for node {}", log_pubkey!(node_id));
1833                                                         },
1834                                                         msgs::ErrorAction::IgnoreDuplicateGossip => {},
1835                                                         msgs::ErrorAction::IgnoreError => {
1836                                                                 log_debug!(self.logger, "Received a HandleError event to be ignored for node {}", log_pubkey!(node_id));
1837                                                         },
1838                                                         msgs::ErrorAction::SendErrorMessage { ref msg } => {
1839                                                                 log_trace!(self.logger, "Handling SendErrorMessage HandleError event in peer_handler for node {} with message {}",
1840                                                                                 log_pubkey!(node_id),
1841                                                                                 msg.data);
1842                                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1843                                                         },
1844                                                         msgs::ErrorAction::SendWarningMessage { ref msg, ref log_level } => {
1845                                                                 log_given_level!(self.logger, *log_level, "Handling SendWarningMessage HandleError event in peer_handler for node {} with message {}",
1846                                                                                 log_pubkey!(node_id),
1847                                                                                 msg.data);
1848                                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1849                                                         },
1850                                                 }
1851                                         },
1852                                         MessageSendEvent::SendChannelRangeQuery { ref node_id, ref msg } => {
1853                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1854                                         },
1855                                         MessageSendEvent::SendShortIdsQuery { ref node_id, ref msg } => {
1856                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1857                                         }
1858                                         MessageSendEvent::SendReplyChannelRange { ref node_id, ref msg } => {
1859                                                 log_gossip!(self.logger, "Handling SendReplyChannelRange event in peer_handler for node {} with num_scids={} first_blocknum={} number_of_blocks={}, sync_complete={}",
1860                                                         log_pubkey!(node_id),
1861                                                         msg.short_channel_ids.len(),
1862                                                         msg.first_blocknum,
1863                                                         msg.number_of_blocks,
1864                                                         msg.sync_complete);
1865                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1866                                         }
1867                                         MessageSendEvent::SendGossipTimestampFilter { ref node_id, ref msg } => {
1868                                                 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1869                                         }
1870                                 }
1871                         }
1872
1873                         for (node_id, msg) in self.custom_message_handler.get_and_clear_pending_msg() {
1874                                 if peers_to_disconnect.get(&node_id).is_some() { continue; }
1875                                 self.enqueue_message(&mut *get_peer_for_forwarding!(&node_id), &msg);
1876                         }
1877
1878                         for (descriptor, peer_mutex) in peers.iter() {
1879                                 let mut peer = peer_mutex.lock().unwrap();
1880                                 if flush_read_disabled { peer.received_channel_announce_since_backlogged = false; }
1881                                 self.do_attempt_write_data(&mut (*descriptor).clone(), &mut *peer, flush_read_disabled);
1882                         }
1883                 }
1884                 if !peers_to_disconnect.is_empty() {
1885                         let mut peers_lock = self.peers.write().unwrap();
1886                         let peers = &mut *peers_lock;
1887                         for (node_id, msg) in peers_to_disconnect.drain() {
1888                                 // Note that since we are holding the peers *write* lock we can
1889                                 // remove from node_id_to_descriptor immediately (as no other
1890                                 // thread can be holding the peer lock if we have the global write
1891                                 // lock).
1892
1893                                 let descriptor_opt = self.node_id_to_descriptor.lock().unwrap().remove(&node_id);
1894                                 if let Some(mut descriptor) = descriptor_opt {
1895                                         if let Some(peer_mutex) = peers.remove(&descriptor) {
1896                                                 let mut peer = peer_mutex.lock().unwrap();
1897                                                 if let Some(msg) = msg {
1898                                                         log_trace!(self.logger, "Handling DisconnectPeer HandleError event in peer_handler for node {} with message {}",
1899                                                                         log_pubkey!(node_id),
1900                                                                         msg.data);
1901                                                         self.enqueue_message(&mut *peer, &msg);
1902                                                         // This isn't guaranteed to work, but if there is enough free
1903                                                         // room in the send buffer, put the error message there...
1904                                                         self.do_attempt_write_data(&mut descriptor, &mut *peer, false);
1905                                                 }
1906                                                 self.do_disconnect(descriptor, &*peer, "DisconnectPeer HandleError");
1907                                         }
1908                                 }
1909                         }
1910                 }
1911         }
1912
1913         /// Indicates that the given socket descriptor's connection is now closed.
1914         pub fn socket_disconnected(&self, descriptor: &Descriptor) {
1915                 self.disconnect_event_internal(descriptor, false);
1916         }
1917
1918         fn do_disconnect(&self, mut descriptor: Descriptor, peer: &Peer, reason: &'static str) {
1919                 if !peer.handshake_complete() {
1920                         log_trace!(self.logger, "Disconnecting peer which hasn't completed handshake due to {}", reason);
1921                         descriptor.disconnect_socket();
1922                         return;
1923                 }
1924
1925                 debug_assert!(peer.their_node_id.is_some());
1926                 if let Some((node_id, _)) = peer.their_node_id {
1927                         log_trace!(self.logger, "Disconnecting peer with id {} due to {}", node_id, reason);
1928                         self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1929                         self.message_handler.onion_message_handler.peer_disconnected(&node_id, false);
1930                 }
1931                 descriptor.disconnect_socket();
1932         }
1933
1934         fn disconnect_event_internal(&self, descriptor: &Descriptor, no_connection_possible: bool) {
1935                 let mut peers = self.peers.write().unwrap();
1936                 let peer_option = peers.remove(descriptor);
1937                 match peer_option {
1938                         None => {
1939                                 // This is most likely a simple race condition where the user found that the socket
1940                                 // was disconnected, then we told the user to `disconnect_socket()`, then they
1941                                 // called this method. Either way we're disconnected, return.
1942                         },
1943                         Some(peer_lock) => {
1944                                 let peer = peer_lock.lock().unwrap();
1945                                 if !peer.handshake_complete() { return; }
1946                                 debug_assert!(peer.their_node_id.is_some());
1947                                 if let Some((node_id, _)) = peer.their_node_id {
1948                                         log_trace!(self.logger,
1949                                                 "Handling disconnection of peer {}, with {}future connection to the peer possible.",
1950                                                 log_pubkey!(node_id), if no_connection_possible { "no " } else { "" });
1951                                         self.node_id_to_descriptor.lock().unwrap().remove(&node_id);
1952                                         self.message_handler.chan_handler.peer_disconnected(&node_id, no_connection_possible);
1953                                         self.message_handler.onion_message_handler.peer_disconnected(&node_id, no_connection_possible);
1954                                 }
1955                         }
1956                 };
1957         }
1958
1959         /// Disconnect a peer given its node id.
1960         ///
1961         /// Set `no_connection_possible` to true to prevent any further connection with this peer,
1962         /// force-closing any channels we have with it.
1963         ///
1964         /// If a peer is connected, this will call [`disconnect_socket`] on the descriptor for the
1965         /// peer. Thus, be very careful about reentrancy issues.
1966         ///
1967         /// [`disconnect_socket`]: SocketDescriptor::disconnect_socket
1968         pub fn disconnect_by_node_id(&self, node_id: PublicKey, _no_connection_possible: bool) {
1969                 let mut peers_lock = self.peers.write().unwrap();
1970                 if let Some(descriptor) = self.node_id_to_descriptor.lock().unwrap().remove(&node_id) {
1971                         let peer_opt = peers_lock.remove(&descriptor);
1972                         if let Some(peer_mutex) = peer_opt {
1973                                 self.do_disconnect(descriptor, &*peer_mutex.lock().unwrap(), "client request");
1974                         } else { debug_assert!(false, "node_id_to_descriptor thought we had a peer"); }
1975                 }
1976         }
1977
1978         /// Disconnects all currently-connected peers. This is useful on platforms where there may be
1979         /// an indication that TCP sockets have stalled even if we weren't around to time them out
1980         /// using regular ping/pongs.
1981         pub fn disconnect_all_peers(&self) {
1982                 let mut peers_lock = self.peers.write().unwrap();
1983                 self.node_id_to_descriptor.lock().unwrap().clear();
1984                 let peers = &mut *peers_lock;
1985                 for (descriptor, peer_mutex) in peers.drain() {
1986                         self.do_disconnect(descriptor, &*peer_mutex.lock().unwrap(), "client request to disconnect all peers");
1987                 }
1988         }
1989
1990         /// This is called when we're blocked on sending additional gossip messages until we receive a
1991         /// pong. If we aren't waiting on a pong, we take this opportunity to send a ping (setting
1992         /// `awaiting_pong_timer_tick_intervals` to a special flag value to indicate this).
1993         fn maybe_send_extra_ping(&self, peer: &mut Peer) {
1994                 if peer.awaiting_pong_timer_tick_intervals == 0 {
1995                         peer.awaiting_pong_timer_tick_intervals = -1;
1996                         let ping = msgs::Ping {
1997                                 ponglen: 0,
1998                                 byteslen: 64,
1999                         };
2000                         self.enqueue_message(peer, &ping);
2001                 }
2002         }
2003
2004         /// Send pings to each peer and disconnect those which did not respond to the last round of
2005         /// pings.
2006         ///
2007         /// This may be called on any timescale you want, however, roughly once every ten seconds is
2008         /// preferred. The call rate determines both how often we send a ping to our peers and how much
2009         /// time they have to respond before we disconnect them.
2010         ///
2011         /// May call [`send_data`] on all [`SocketDescriptor`]s. Thus, be very careful with reentrancy
2012         /// issues!
2013         ///
2014         /// [`send_data`]: SocketDescriptor::send_data
2015         pub fn timer_tick_occurred(&self) {
2016                 let mut descriptors_needing_disconnect = Vec::new();
2017                 {
2018                         let peers_lock = self.peers.read().unwrap();
2019
2020                         self.update_gossip_backlogged();
2021                         let flush_read_disabled = self.gossip_processing_backlog_lifted.swap(false, Ordering::Relaxed);
2022
2023                         for (descriptor, peer_mutex) in peers_lock.iter() {
2024                                 let mut peer = peer_mutex.lock().unwrap();
2025                                 if flush_read_disabled { peer.received_channel_announce_since_backlogged = false; }
2026
2027                                 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_node_id.is_none() {
2028                                         // The peer needs to complete its handshake before we can exchange messages. We
2029                                         // give peers one timer tick to complete handshake, reusing
2030                                         // `awaiting_pong_timer_tick_intervals` to track number of timer ticks taken
2031                                         // for handshake completion.
2032                                         if peer.awaiting_pong_timer_tick_intervals != 0 {
2033                                                 descriptors_needing_disconnect.push(descriptor.clone());
2034                                         } else {
2035                                                 peer.awaiting_pong_timer_tick_intervals = 1;
2036                                         }
2037                                         continue;
2038                                 }
2039
2040                                 loop { // Used as a `goto` to skip writing a Ping message.
2041                                         if peer.awaiting_pong_timer_tick_intervals == -1 {
2042                                                 // Magic value set in `maybe_send_extra_ping`.
2043                                                 peer.awaiting_pong_timer_tick_intervals = 1;
2044                                                 peer.received_message_since_timer_tick = false;
2045                                                 break;
2046                                         }
2047
2048                                         if (peer.awaiting_pong_timer_tick_intervals > 0 && !peer.received_message_since_timer_tick)
2049                                                 || peer.awaiting_pong_timer_tick_intervals as u64 >
2050                                                         MAX_BUFFER_DRAIN_TICK_INTERVALS_PER_PEER as u64 * peers_lock.len() as u64
2051                                         {
2052                                                 descriptors_needing_disconnect.push(descriptor.clone());
2053                                                 break;
2054                                         }
2055                                         peer.received_message_since_timer_tick = false;
2056
2057                                         if peer.awaiting_pong_timer_tick_intervals > 0 {
2058                                                 peer.awaiting_pong_timer_tick_intervals += 1;
2059                                                 break;
2060                                         }
2061
2062                                         peer.awaiting_pong_timer_tick_intervals = 1;
2063                                         let ping = msgs::Ping {
2064                                                 ponglen: 0,
2065                                                 byteslen: 64,
2066                                         };
2067                                         self.enqueue_message(&mut *peer, &ping);
2068                                         break;
2069                                 }
2070                                 self.do_attempt_write_data(&mut (descriptor.clone()), &mut *peer, flush_read_disabled);
2071                         }
2072                 }
2073
2074                 if !descriptors_needing_disconnect.is_empty() {
2075                         {
2076                                 let mut peers_lock = self.peers.write().unwrap();
2077                                 for descriptor in descriptors_needing_disconnect {
2078                                         if let Some(peer_mutex) = peers_lock.remove(&descriptor) {
2079                                                 let peer = peer_mutex.lock().unwrap();
2080                                                 if let Some((node_id, _)) = peer.their_node_id {
2081                                                         self.node_id_to_descriptor.lock().unwrap().remove(&node_id);
2082                                                 }
2083                                                 self.do_disconnect(descriptor, &*peer, "ping timeout");
2084                                         }
2085                                 }
2086                         }
2087                 }
2088         }
2089
2090         #[allow(dead_code)]
2091         // Messages of up to 64KB should never end up more than half full with addresses, as that would
2092         // be absurd. We ensure this by checking that at least 100 (our stated public contract on when
2093         // broadcast_node_announcement panics) of the maximum-length addresses would fit in a 64KB
2094         // message...
2095         const HALF_MESSAGE_IS_ADDRS: u32 = ::core::u16::MAX as u32 / (NetAddress::MAX_LEN as u32 + 1) / 2;
2096         #[deny(const_err)]
2097         #[allow(dead_code)]
2098         // ...by failing to compile if the number of addresses that would be half of a message is
2099         // smaller than 100:
2100         const STATIC_ASSERT: u32 = Self::HALF_MESSAGE_IS_ADDRS - 100;
2101
2102         /// Generates a signed node_announcement from the given arguments, sending it to all connected
2103         /// peers. Note that peers will likely ignore this message unless we have at least one public
2104         /// channel which has at least six confirmations on-chain.
2105         ///
2106         /// `rgb` is a node "color" and `alias` is a printable human-readable string to describe this
2107         /// node to humans. They carry no in-protocol meaning.
2108         ///
2109         /// `addresses` represent the set (possibly empty) of socket addresses on which this node
2110         /// accepts incoming connections. These will be included in the node_announcement, publicly
2111         /// tying these addresses together and to this node. If you wish to preserve user privacy,
2112         /// addresses should likely contain only Tor Onion addresses.
2113         ///
2114         /// Panics if `addresses` is absurdly large (more than 100).
2115         ///
2116         /// [`get_and_clear_pending_msg_events`]: MessageSendEventsProvider::get_and_clear_pending_msg_events
2117         pub fn broadcast_node_announcement(&self, rgb: [u8; 3], alias: [u8; 32], mut addresses: Vec<NetAddress>) {
2118                 if addresses.len() > 100 {
2119                         panic!("More than half the message size was taken up by public addresses!");
2120                 }
2121
2122                 // While all existing nodes handle unsorted addresses just fine, the spec requires that
2123                 // addresses be sorted for future compatibility.
2124                 addresses.sort_by_key(|addr| addr.get_id());
2125
2126                 let features = self.message_handler.chan_handler.provided_node_features()
2127                         .or(self.message_handler.route_handler.provided_node_features())
2128                         .or(self.message_handler.onion_message_handler.provided_node_features());
2129                 let announcement = msgs::UnsignedNodeAnnouncement {
2130                         features,
2131                         timestamp: self.last_node_announcement_serial.fetch_add(1, Ordering::AcqRel),
2132                         node_id: NodeId::from_pubkey(&self.node_signer.get_node_id(Recipient::Node).unwrap()),
2133                         rgb, alias, addresses,
2134                         excess_address_data: Vec::new(),
2135                         excess_data: Vec::new(),
2136                 };
2137                 let node_announce_sig = match self.node_signer.sign_gossip_message(
2138                         msgs::UnsignedGossipMessage::NodeAnnouncement(&announcement)
2139                 ) {
2140                         Ok(sig) => sig,
2141                         Err(_) => {
2142                                 log_error!(self.logger, "Failed to generate signature for node_announcement");
2143                                 return;
2144                         },
2145                 };
2146
2147                 let msg = msgs::NodeAnnouncement {
2148                         signature: node_announce_sig,
2149                         contents: announcement
2150                 };
2151
2152                 log_debug!(self.logger, "Broadcasting NodeAnnouncement after passing it to our own RoutingMessageHandler.");
2153                 let _ = self.message_handler.route_handler.handle_node_announcement(&msg);
2154                 self.forward_broadcast_msg(&*self.peers.read().unwrap(), &wire::Message::NodeAnnouncement(msg), None);
2155         }
2156 }
2157
2158 fn is_gossip_msg(type_id: u16) -> bool {
2159         match type_id {
2160                 msgs::ChannelAnnouncement::TYPE |
2161                 msgs::ChannelUpdate::TYPE |
2162                 msgs::NodeAnnouncement::TYPE |
2163                 msgs::QueryChannelRange::TYPE |
2164                 msgs::ReplyChannelRange::TYPE |
2165                 msgs::QueryShortChannelIds::TYPE |
2166                 msgs::ReplyShortChannelIdsEnd::TYPE => true,
2167                 _ => false
2168         }
2169 }
2170
2171 #[cfg(test)]
2172 mod tests {
2173         use crate::chain::keysinterface::{NodeSigner, Recipient};
2174         use crate::ln::peer_handler::{PeerManager, MessageHandler, SocketDescriptor, IgnoringMessageHandler, filter_addresses};
2175         use crate::ln::{msgs, wire};
2176         use crate::ln::msgs::NetAddress;
2177         use crate::util::events;
2178         use crate::util::test_utils;
2179
2180         use bitcoin::secp256k1::SecretKey;
2181
2182         use crate::prelude::*;
2183         use crate::sync::{Arc, Mutex};
2184         use core::sync::atomic::Ordering;
2185
2186         #[derive(Clone)]
2187         struct FileDescriptor {
2188                 fd: u16,
2189                 outbound_data: Arc<Mutex<Vec<u8>>>,
2190         }
2191         impl PartialEq for FileDescriptor {
2192                 fn eq(&self, other: &Self) -> bool {
2193                         self.fd == other.fd
2194                 }
2195         }
2196         impl Eq for FileDescriptor { }
2197         impl core::hash::Hash for FileDescriptor {
2198                 fn hash<H: core::hash::Hasher>(&self, hasher: &mut H) {
2199                         self.fd.hash(hasher)
2200                 }
2201         }
2202
2203         impl SocketDescriptor for FileDescriptor {
2204                 fn send_data(&mut self, data: &[u8], _resume_read: bool) -> usize {
2205                         self.outbound_data.lock().unwrap().extend_from_slice(data);
2206                         data.len()
2207                 }
2208
2209                 fn disconnect_socket(&mut self) {}
2210         }
2211
2212         struct PeerManagerCfg {
2213                 chan_handler: test_utils::TestChannelMessageHandler,
2214                 routing_handler: test_utils::TestRoutingMessageHandler,
2215                 logger: test_utils::TestLogger,
2216                 node_signer: test_utils::TestNodeSigner,
2217         }
2218
2219         fn create_peermgr_cfgs(peer_count: usize) -> Vec<PeerManagerCfg> {
2220                 let mut cfgs = Vec::new();
2221                 for i in 0..peer_count {
2222                         let node_secret = SecretKey::from_slice(&[42 + i as u8; 32]).unwrap();
2223                         cfgs.push(
2224                                 PeerManagerCfg{
2225                                         chan_handler: test_utils::TestChannelMessageHandler::new(),
2226                                         logger: test_utils::TestLogger::new(),
2227                                         routing_handler: test_utils::TestRoutingMessageHandler::new(),
2228                                         node_signer: test_utils::TestNodeSigner::new(node_secret),
2229                                 }
2230                         );
2231                 }
2232
2233                 cfgs
2234         }
2235
2236         fn create_network<'a>(peer_count: usize, cfgs: &'a Vec<PeerManagerCfg>) -> Vec<PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, IgnoringMessageHandler, &'a test_utils::TestLogger, IgnoringMessageHandler, &'a test_utils::TestNodeSigner>> {
2237                 let mut peers = Vec::new();
2238                 for i in 0..peer_count {
2239                         let ephemeral_bytes = [i as u8; 32];
2240                         let msg_handler = MessageHandler { chan_handler: &cfgs[i].chan_handler, route_handler: &cfgs[i].routing_handler, onion_message_handler: IgnoringMessageHandler {} };
2241                         let peer = PeerManager::new(msg_handler, 0, &ephemeral_bytes, &cfgs[i].logger, IgnoringMessageHandler {}, &cfgs[i].node_signer);
2242                         peers.push(peer);
2243                 }
2244
2245                 peers
2246         }
2247
2248         fn establish_connection<'a>(peer_a: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, IgnoringMessageHandler, &'a test_utils::TestLogger, IgnoringMessageHandler, &'a test_utils::TestNodeSigner>, peer_b: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, IgnoringMessageHandler, &'a test_utils::TestLogger, IgnoringMessageHandler, &'a test_utils::TestNodeSigner>) -> (FileDescriptor, FileDescriptor) {
2249                 let id_a = peer_a.node_signer.get_node_id(Recipient::Node).unwrap();
2250                 let mut fd_a = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
2251                 let addr_a = NetAddress::IPv4{addr: [127, 0, 0, 1], port: 1000};
2252                 let id_b = peer_b.node_signer.get_node_id(Recipient::Node).unwrap();
2253                 let mut fd_b = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
2254                 let addr_b = NetAddress::IPv4{addr: [127, 0, 0, 1], port: 1001};
2255                 let initial_data = peer_b.new_outbound_connection(id_a, fd_b.clone(), Some(addr_a.clone())).unwrap();
2256                 peer_a.new_inbound_connection(fd_a.clone(), Some(addr_b.clone())).unwrap();
2257                 assert_eq!(peer_a.read_event(&mut fd_a, &initial_data).unwrap(), false);
2258                 peer_a.process_events();
2259
2260                 let a_data = fd_a.outbound_data.lock().unwrap().split_off(0);
2261                 assert_eq!(peer_b.read_event(&mut fd_b, &a_data).unwrap(), false);
2262
2263                 peer_b.process_events();
2264                 let b_data = fd_b.outbound_data.lock().unwrap().split_off(0);
2265                 assert_eq!(peer_a.read_event(&mut fd_a, &b_data).unwrap(), false);
2266
2267                 peer_a.process_events();
2268                 let a_data = fd_a.outbound_data.lock().unwrap().split_off(0);
2269                 assert_eq!(peer_b.read_event(&mut fd_b, &a_data).unwrap(), false);
2270
2271                 assert!(peer_a.get_peer_node_ids().contains(&(id_b, Some(addr_b))));
2272                 assert!(peer_b.get_peer_node_ids().contains(&(id_a, Some(addr_a))));
2273
2274                 (fd_a.clone(), fd_b.clone())
2275         }
2276
2277         #[test]
2278         fn test_disconnect_peer() {
2279                 // Simple test which builds a network of PeerManager, connects and brings them to NoiseState::Finished and
2280                 // push a DisconnectPeer event to remove the node flagged by id
2281                 let cfgs = create_peermgr_cfgs(2);
2282                 let chan_handler = test_utils::TestChannelMessageHandler::new();
2283                 let mut peers = create_network(2, &cfgs);
2284                 establish_connection(&peers[0], &peers[1]);
2285                 assert_eq!(peers[0].peers.read().unwrap().len(), 1);
2286
2287                 let their_id = peers[1].node_signer.get_node_id(Recipient::Node).unwrap();
2288
2289                 chan_handler.pending_events.lock().unwrap().push(events::MessageSendEvent::HandleError {
2290                         node_id: their_id,
2291                         action: msgs::ErrorAction::DisconnectPeer { msg: None },
2292                 });
2293                 assert_eq!(chan_handler.pending_events.lock().unwrap().len(), 1);
2294                 peers[0].message_handler.chan_handler = &chan_handler;
2295
2296                 peers[0].process_events();
2297                 assert_eq!(peers[0].peers.read().unwrap().len(), 0);
2298         }
2299
2300         #[test]
2301         fn test_send_simple_msg() {
2302                 // Simple test which builds a network of PeerManager, connects and brings them to NoiseState::Finished and
2303                 // push a message from one peer to another.
2304                 let cfgs = create_peermgr_cfgs(2);
2305                 let a_chan_handler = test_utils::TestChannelMessageHandler::new();
2306                 let b_chan_handler = test_utils::TestChannelMessageHandler::new();
2307                 let mut peers = create_network(2, &cfgs);
2308                 let (fd_a, mut fd_b) = establish_connection(&peers[0], &peers[1]);
2309                 assert_eq!(peers[0].peers.read().unwrap().len(), 1);
2310
2311                 let their_id = peers[1].node_signer.get_node_id(Recipient::Node).unwrap();
2312
2313                 let msg = msgs::Shutdown { channel_id: [42; 32], scriptpubkey: bitcoin::Script::new() };
2314                 a_chan_handler.pending_events.lock().unwrap().push(events::MessageSendEvent::SendShutdown {
2315                         node_id: their_id, msg: msg.clone()
2316                 });
2317                 peers[0].message_handler.chan_handler = &a_chan_handler;
2318
2319                 b_chan_handler.expect_receive_msg(wire::Message::Shutdown(msg));
2320                 peers[1].message_handler.chan_handler = &b_chan_handler;
2321
2322                 peers[0].process_events();
2323
2324                 let a_data = fd_a.outbound_data.lock().unwrap().split_off(0);
2325                 assert_eq!(peers[1].read_event(&mut fd_b, &a_data).unwrap(), false);
2326         }
2327
2328         #[test]
2329         fn test_disconnect_all_peer() {
2330                 // Simple test which builds a network of PeerManager, connects and brings them to NoiseState::Finished and
2331                 // then calls disconnect_all_peers
2332                 let cfgs = create_peermgr_cfgs(2);
2333                 let peers = create_network(2, &cfgs);
2334                 establish_connection(&peers[0], &peers[1]);
2335                 assert_eq!(peers[0].peers.read().unwrap().len(), 1);
2336
2337                 peers[0].disconnect_all_peers();
2338                 assert_eq!(peers[0].peers.read().unwrap().len(), 0);
2339         }
2340
2341         #[test]
2342         fn test_timer_tick_occurred() {
2343                 // Create peers, a vector of two peer managers, perform initial set up and check that peers[0] has one Peer.
2344                 let cfgs = create_peermgr_cfgs(2);
2345                 let peers = create_network(2, &cfgs);
2346                 establish_connection(&peers[0], &peers[1]);
2347                 assert_eq!(peers[0].peers.read().unwrap().len(), 1);
2348
2349                 // peers[0] awaiting_pong is set to true, but the Peer is still connected
2350                 peers[0].timer_tick_occurred();
2351                 peers[0].process_events();
2352                 assert_eq!(peers[0].peers.read().unwrap().len(), 1);
2353
2354                 // Since timer_tick_occurred() is called again when awaiting_pong is true, all Peers are disconnected
2355                 peers[0].timer_tick_occurred();
2356                 peers[0].process_events();
2357                 assert_eq!(peers[0].peers.read().unwrap().len(), 0);
2358         }
2359
2360         #[test]
2361         fn test_do_attempt_write_data() {
2362                 // Create 2 peers with custom TestRoutingMessageHandlers and connect them.
2363                 let cfgs = create_peermgr_cfgs(2);
2364                 cfgs[0].routing_handler.request_full_sync.store(true, Ordering::Release);
2365                 cfgs[1].routing_handler.request_full_sync.store(true, Ordering::Release);
2366                 let peers = create_network(2, &cfgs);
2367
2368                 // By calling establish_connect, we trigger do_attempt_write_data between
2369                 // the peers. Previously this function would mistakenly enter an infinite loop
2370                 // when there were more channel messages available than could fit into a peer's
2371                 // buffer. This issue would now be detected by this test (because we use custom
2372                 // RoutingMessageHandlers that intentionally return more channel messages
2373                 // than can fit into a peer's buffer).
2374                 let (mut fd_a, mut fd_b) = establish_connection(&peers[0], &peers[1]);
2375
2376                 // Make each peer to read the messages that the other peer just wrote to them. Note that
2377                 // due to the max-message-before-ping limits this may take a few iterations to complete.
2378                 for _ in 0..150/super::BUFFER_DRAIN_MSGS_PER_TICK + 1 {
2379                         peers[1].process_events();
2380                         let a_read_data = fd_b.outbound_data.lock().unwrap().split_off(0);
2381                         assert!(!a_read_data.is_empty());
2382
2383                         peers[0].read_event(&mut fd_a, &a_read_data).unwrap();
2384                         peers[0].process_events();
2385
2386                         let b_read_data = fd_a.outbound_data.lock().unwrap().split_off(0);
2387                         assert!(!b_read_data.is_empty());
2388                         peers[1].read_event(&mut fd_b, &b_read_data).unwrap();
2389
2390                         peers[0].process_events();
2391                         assert_eq!(fd_a.outbound_data.lock().unwrap().len(), 0, "Until A receives data, it shouldn't send more messages");
2392                 }
2393
2394                 // Check that each peer has received the expected number of channel updates and channel
2395                 // announcements.
2396                 assert_eq!(cfgs[0].routing_handler.chan_upds_recvd.load(Ordering::Acquire), 108);
2397                 assert_eq!(cfgs[0].routing_handler.chan_anns_recvd.load(Ordering::Acquire), 54);
2398                 assert_eq!(cfgs[1].routing_handler.chan_upds_recvd.load(Ordering::Acquire), 108);
2399                 assert_eq!(cfgs[1].routing_handler.chan_anns_recvd.load(Ordering::Acquire), 54);
2400         }
2401
2402         #[test]
2403         fn test_handshake_timeout() {
2404                 // Tests that we time out a peer still waiting on handshake completion after a full timer
2405                 // tick.
2406                 let cfgs = create_peermgr_cfgs(2);
2407                 cfgs[0].routing_handler.request_full_sync.store(true, Ordering::Release);
2408                 cfgs[1].routing_handler.request_full_sync.store(true, Ordering::Release);
2409                 let peers = create_network(2, &cfgs);
2410
2411                 let a_id = peers[0].node_signer.get_node_id(Recipient::Node).unwrap();
2412                 let mut fd_a = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
2413                 let mut fd_b = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
2414                 let initial_data = peers[1].new_outbound_connection(a_id, fd_b.clone(), None).unwrap();
2415                 peers[0].new_inbound_connection(fd_a.clone(), None).unwrap();
2416
2417                 // If we get a single timer tick before completion, that's fine
2418                 assert_eq!(peers[0].peers.read().unwrap().len(), 1);
2419                 peers[0].timer_tick_occurred();
2420                 assert_eq!(peers[0].peers.read().unwrap().len(), 1);
2421
2422                 assert_eq!(peers[0].read_event(&mut fd_a, &initial_data).unwrap(), false);
2423                 peers[0].process_events();
2424                 let a_data = fd_a.outbound_data.lock().unwrap().split_off(0);
2425                 assert_eq!(peers[1].read_event(&mut fd_b, &a_data).unwrap(), false);
2426                 peers[1].process_events();
2427
2428                 // ...but if we get a second timer tick, we should disconnect the peer
2429                 peers[0].timer_tick_occurred();
2430                 assert_eq!(peers[0].peers.read().unwrap().len(), 0);
2431
2432                 let b_data = fd_b.outbound_data.lock().unwrap().split_off(0);
2433                 assert!(peers[0].read_event(&mut fd_a, &b_data).is_err());
2434         }
2435
2436         #[test]
2437         fn test_filter_addresses(){
2438                 // Tests the filter_addresses function.
2439
2440                 // For (10/8)
2441                 let ip_address = NetAddress::IPv4{addr: [10, 0, 0, 0], port: 1000};
2442                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2443                 let ip_address = NetAddress::IPv4{addr: [10, 0, 255, 201], port: 1000};
2444                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2445                 let ip_address = NetAddress::IPv4{addr: [10, 255, 255, 255], port: 1000};
2446                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2447
2448                 // For (0/8)
2449                 let ip_address = NetAddress::IPv4{addr: [0, 0, 0, 0], port: 1000};
2450                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2451                 let ip_address = NetAddress::IPv4{addr: [0, 0, 255, 187], port: 1000};
2452                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2453                 let ip_address = NetAddress::IPv4{addr: [0, 255, 255, 255], port: 1000};
2454                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2455
2456                 // For (100.64/10)
2457                 let ip_address = NetAddress::IPv4{addr: [100, 64, 0, 0], port: 1000};
2458                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2459                 let ip_address = NetAddress::IPv4{addr: [100, 78, 255, 0], port: 1000};
2460                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2461                 let ip_address = NetAddress::IPv4{addr: [100, 127, 255, 255], port: 1000};
2462                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2463
2464                 // For (127/8)
2465                 let ip_address = NetAddress::IPv4{addr: [127, 0, 0, 0], port: 1000};
2466                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2467                 let ip_address = NetAddress::IPv4{addr: [127, 65, 73, 0], port: 1000};
2468                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2469                 let ip_address = NetAddress::IPv4{addr: [127, 255, 255, 255], port: 1000};
2470                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2471
2472                 // For (169.254/16)
2473                 let ip_address = NetAddress::IPv4{addr: [169, 254, 0, 0], port: 1000};
2474                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2475                 let ip_address = NetAddress::IPv4{addr: [169, 254, 221, 101], port: 1000};
2476                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2477                 let ip_address = NetAddress::IPv4{addr: [169, 254, 255, 255], port: 1000};
2478                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2479
2480                 // For (172.16/12)
2481                 let ip_address = NetAddress::IPv4{addr: [172, 16, 0, 0], port: 1000};
2482                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2483                 let ip_address = NetAddress::IPv4{addr: [172, 27, 101, 23], port: 1000};
2484                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2485                 let ip_address = NetAddress::IPv4{addr: [172, 31, 255, 255], port: 1000};
2486                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2487
2488                 // For (192.168/16)
2489                 let ip_address = NetAddress::IPv4{addr: [192, 168, 0, 0], port: 1000};
2490                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2491                 let ip_address = NetAddress::IPv4{addr: [192, 168, 205, 159], port: 1000};
2492                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2493                 let ip_address = NetAddress::IPv4{addr: [192, 168, 255, 255], port: 1000};
2494                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2495
2496                 // For (192.88.99/24)
2497                 let ip_address = NetAddress::IPv4{addr: [192, 88, 99, 0], port: 1000};
2498                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2499                 let ip_address = NetAddress::IPv4{addr: [192, 88, 99, 140], port: 1000};
2500                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2501                 let ip_address = NetAddress::IPv4{addr: [192, 88, 99, 255], port: 1000};
2502                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2503
2504                 // For other IPv4 addresses
2505                 let ip_address = NetAddress::IPv4{addr: [188, 255, 99, 0], port: 1000};
2506                 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2507                 let ip_address = NetAddress::IPv4{addr: [123, 8, 129, 14], port: 1000};
2508                 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2509                 let ip_address = NetAddress::IPv4{addr: [2, 88, 9, 255], port: 1000};
2510                 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2511
2512                 // For (2000::/3)
2513                 let ip_address = NetAddress::IPv6{addr: [32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], port: 1000};
2514                 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2515                 let ip_address = NetAddress::IPv6{addr: [45, 34, 209, 190, 0, 123, 55, 34, 0, 0, 3, 27, 201, 0, 0, 0], port: 1000};
2516                 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2517                 let ip_address = NetAddress::IPv6{addr: [63, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], port: 1000};
2518                 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2519
2520                 // For other IPv6 addresses
2521                 let ip_address = NetAddress::IPv6{addr: [24, 240, 12, 32, 0, 0, 0, 0, 20, 97, 0, 32, 121, 254, 0, 0], port: 1000};
2522                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2523                 let ip_address = NetAddress::IPv6{addr: [68, 23, 56, 63, 0, 0, 2, 7, 75, 109, 0, 39, 0, 0, 0, 0], port: 1000};
2524                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2525                 let ip_address = NetAddress::IPv6{addr: [101, 38, 140, 230, 100, 0, 30, 98, 0, 26, 0, 0, 57, 96, 0, 0], port: 1000};
2526                 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2527
2528                 // For (None)
2529                 assert_eq!(filter_addresses(None), None);
2530         }
2531 }