1 // This file is Copyright its original authors, visible in version control
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
10 //! Top level peer message handling and socket handling logic lives here.
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.
18 use bitcoin::secp256k1::{self, Secp256k1, SecretKey, PublicKey};
20 use ln::features::{InitFeatures, NodeFeatures};
22 use ln::msgs::{ChannelMessageHandler, LightningError, NetAddress, OnionMessageHandler, RoutingMessageHandler};
23 use ln::channelmanager::{SimpleArcChannelManager, SimpleRefChannelManager};
24 use util::ser::{VecWriter, Writeable, Writer};
25 use ln::peer_channel_encryptor::{PeerChannelEncryptor,NextNoiseStep};
28 use routing::gossip::{NetworkGraph, P2PGossipSync};
29 use util::atomic_counter::AtomicCounter;
30 use util::crypto::sign;
31 use util::events::{MessageSendEvent, MessageSendEventsProvider, OnionMessageProvider};
32 use util::logger::Logger;
36 use alloc::collections::LinkedList;
37 use sync::{Arc, Mutex, MutexGuard, FairRwLock};
38 use core::sync::atomic::{AtomicBool, AtomicU64, Ordering};
39 use core::{cmp, hash, fmt, mem};
41 use core::convert::Infallible;
42 #[cfg(feature = "std")] use std::error;
44 use bitcoin::hashes::sha256::Hash as Sha256;
45 use bitcoin::hashes::sha256d::Hash as Sha256dHash;
46 use bitcoin::hashes::sha256::HashEngine as Sha256Engine;
47 use bitcoin::hashes::{HashEngine, Hash};
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>;
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)>;
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() }
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<&PublicKey>) -> Option<msgs::NodeAnnouncement> { None }
75 fn peer_connected(&self, _their_node_id: &PublicKey, _init: &msgs::Init) {}
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(()) }
81 impl OnionMessageProvider for IgnoringMessageHandler {
82 fn next_onion_message_for_peer(&self, _peer_node_id: PublicKey) -> Option<msgs::OnionMessage> { None }
84 impl OnionMessageHandler for IgnoringMessageHandler {
85 fn handle_onion_message(&self, _their_node_id: &PublicKey, _msg: &msgs::OnionMessage) {}
86 fn peer_connected(&self, _their_node_id: &PublicKey, _init: &msgs::Init) {}
87 fn peer_disconnected(&self, _their_node_id: &PublicKey, _no_connection_possible: bool) {}
89 impl Deref for IgnoringMessageHandler {
90 type Target = IgnoringMessageHandler;
91 fn deref(&self) -> &Self { self }
94 // Implement Type for Infallible, note that it cannot be constructed, and thus you can never call a
95 // method that takes self for it.
96 impl wire::Type for Infallible {
97 fn type_id(&self) -> u16 {
101 impl Writeable for Infallible {
102 fn write<W: Writer>(&self, _: &mut W) -> Result<(), io::Error> {
107 impl wire::CustomMessageReader for IgnoringMessageHandler {
108 type CustomMessage = Infallible;
109 fn read<R: io::Read>(&self, _message_type: u16, _buffer: &mut R) -> Result<Option<Self::CustomMessage>, msgs::DecodeError> {
114 impl CustomMessageHandler for IgnoringMessageHandler {
115 fn handle_custom_message(&self, _msg: Infallible, _sender_node_id: &PublicKey) -> Result<(), LightningError> {
116 // Since we always return `None` in the read the handle method should never be called.
120 fn get_and_clear_pending_msg(&self) -> Vec<(PublicKey, Self::CustomMessage)> { Vec::new() }
123 /// A dummy struct which implements `ChannelMessageHandler` without having any channels.
124 /// You can provide one of these as the route_handler in a MessageHandler.
125 pub struct ErroringMessageHandler {
126 message_queue: Mutex<Vec<MessageSendEvent>>
128 impl ErroringMessageHandler {
129 /// Constructs a new ErroringMessageHandler
130 pub fn new() -> Self {
131 Self { message_queue: Mutex::new(Vec::new()) }
133 fn push_error(&self, node_id: &PublicKey, channel_id: [u8; 32]) {
134 self.message_queue.lock().unwrap().push(MessageSendEvent::HandleError {
135 action: msgs::ErrorAction::SendErrorMessage {
136 msg: msgs::ErrorMessage { channel_id, data: "We do not support channel messages, sorry.".to_owned() },
138 node_id: node_id.clone(),
142 impl MessageSendEventsProvider for ErroringMessageHandler {
143 fn get_and_clear_pending_msg_events(&self) -> Vec<MessageSendEvent> {
144 let mut res = Vec::new();
145 mem::swap(&mut res, &mut self.message_queue.lock().unwrap());
149 impl ChannelMessageHandler for ErroringMessageHandler {
150 // Any messages which are related to a specific channel generate an error message to let the
151 // peer know we don't care about channels.
152 fn handle_open_channel(&self, their_node_id: &PublicKey, _their_features: InitFeatures, msg: &msgs::OpenChannel) {
153 ErroringMessageHandler::push_error(self, their_node_id, msg.temporary_channel_id);
155 fn handle_accept_channel(&self, their_node_id: &PublicKey, _their_features: InitFeatures, msg: &msgs::AcceptChannel) {
156 ErroringMessageHandler::push_error(self, their_node_id, msg.temporary_channel_id);
158 fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) {
159 ErroringMessageHandler::push_error(self, their_node_id, msg.temporary_channel_id);
161 fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) {
162 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
164 fn handle_channel_ready(&self, their_node_id: &PublicKey, msg: &msgs::ChannelReady) {
165 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
167 fn handle_shutdown(&self, their_node_id: &PublicKey, _their_features: &InitFeatures, msg: &msgs::Shutdown) {
168 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
170 fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &msgs::ClosingSigned) {
171 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
173 fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) {
174 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
176 fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) {
177 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
179 fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) {
180 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
182 fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) {
183 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
185 fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) {
186 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
188 fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) {
189 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
191 fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) {
192 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
194 fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) {
195 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
197 fn handle_channel_reestablish(&self, their_node_id: &PublicKey, msg: &msgs::ChannelReestablish) {
198 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
200 // msgs::ChannelUpdate does not contain the channel_id field, so we just drop them.
201 fn handle_channel_update(&self, _their_node_id: &PublicKey, _msg: &msgs::ChannelUpdate) {}
202 fn peer_disconnected(&self, _their_node_id: &PublicKey, _no_connection_possible: bool) {}
203 fn peer_connected(&self, _their_node_id: &PublicKey, _msg: &msgs::Init) {}
204 fn handle_error(&self, _their_node_id: &PublicKey, _msg: &msgs::ErrorMessage) {}
205 fn provided_node_features(&self) -> NodeFeatures { NodeFeatures::empty() }
207 impl Deref for ErroringMessageHandler {
208 type Target = ErroringMessageHandler;
209 fn deref(&self) -> &Self { self }
212 /// Provides references to trait impls which handle different types of messages.
213 pub struct MessageHandler<CM: Deref, RM: Deref, OM: Deref> where
214 CM::Target: ChannelMessageHandler,
215 RM::Target: RoutingMessageHandler,
216 OM::Target: OnionMessageHandler,
218 /// A message handler which handles messages specific to channels. Usually this is just a
219 /// [`ChannelManager`] object or an [`ErroringMessageHandler`].
221 /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
222 pub chan_handler: CM,
223 /// A message handler which handles messages updating our knowledge of the network channel
224 /// graph. Usually this is just a [`P2PGossipSync`] object or an [`IgnoringMessageHandler`].
226 /// [`P2PGossipSync`]: crate::routing::gossip::P2PGossipSync
227 pub route_handler: RM,
229 /// A message handler which handles onion messages. For now, this can only be an
230 /// [`IgnoringMessageHandler`].
231 pub onion_message_handler: OM,
234 /// Provides an object which can be used to send data to and which uniquely identifies a connection
235 /// to a remote host. You will need to be able to generate multiple of these which meet Eq and
236 /// implement Hash to meet the PeerManager API.
238 /// For efficiency, Clone should be relatively cheap for this type.
240 /// Two descriptors may compare equal (by [`cmp::Eq`] and [`hash::Hash`]) as long as the original
241 /// has been disconnected, the [`PeerManager`] has been informed of the disconnection (either by it
242 /// having triggered the disconnection or a call to [`PeerManager::socket_disconnected`]), and no
243 /// further calls to the [`PeerManager`] related to the original socket occur. This allows you to
244 /// use a file descriptor for your SocketDescriptor directly, however for simplicity you may wish
245 /// to simply use another value which is guaranteed to be globally unique instead.
246 pub trait SocketDescriptor : cmp::Eq + hash::Hash + Clone {
247 /// Attempts to send some data from the given slice to the peer.
249 /// Returns the amount of data which was sent, possibly 0 if the socket has since disconnected.
250 /// Note that in the disconnected case, [`PeerManager::socket_disconnected`] must still be
251 /// called and further write attempts may occur until that time.
253 /// If the returned size is smaller than `data.len()`, a
254 /// [`PeerManager::write_buffer_space_avail`] call must be made the next time more data can be
255 /// written. Additionally, until a `send_data` event completes fully, no further
256 /// [`PeerManager::read_event`] calls should be made for the same peer! Because this is to
257 /// prevent denial-of-service issues, you should not read or buffer any data from the socket
260 /// If a [`PeerManager::read_event`] call on this descriptor had previously returned true
261 /// (indicating that read events should be paused to prevent DoS in the send buffer),
262 /// `resume_read` may be set indicating that read events on this descriptor should resume. A
263 /// `resume_read` of false carries no meaning, and should not cause any action.
264 fn send_data(&mut self, data: &[u8], resume_read: bool) -> usize;
265 /// Disconnect the socket pointed to by this SocketDescriptor.
267 /// You do *not* need to call [`PeerManager::socket_disconnected`] with this socket after this
268 /// call (doing so is a noop).
269 fn disconnect_socket(&mut self);
272 /// Error for PeerManager errors. If you get one of these, you must disconnect the socket and
273 /// generate no further read_event/write_buffer_space_avail/socket_disconnected calls for the
276 pub struct PeerHandleError {
277 /// Used to indicate that we probably can't make any future connections to this peer (e.g.
278 /// because we required features that our peer was missing, or vice versa).
280 /// While LDK's [`ChannelManager`] will not do it automatically, you likely wish to force-close
281 /// any channels with this peer or check for new versions of LDK.
283 /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
284 pub no_connection_possible: bool,
286 impl fmt::Debug for PeerHandleError {
287 fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
288 formatter.write_str("Peer Sent Invalid Data")
291 impl fmt::Display for PeerHandleError {
292 fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
293 formatter.write_str("Peer Sent Invalid Data")
297 #[cfg(feature = "std")]
298 impl error::Error for PeerHandleError {
299 fn description(&self) -> &str {
300 "Peer Sent Invalid Data"
304 enum InitSyncTracker{
306 ChannelsSyncing(u64),
307 NodesSyncing(PublicKey),
310 /// The ratio between buffer sizes at which we stop sending initial sync messages vs when we stop
311 /// forwarding gossip messages to peers altogether.
312 const FORWARD_INIT_SYNC_BUFFER_LIMIT_RATIO: usize = 2;
314 /// When the outbound buffer has this many messages, we'll stop reading bytes from the peer until
315 /// we have fewer than this many messages in the outbound buffer again.
316 /// We also use this as the target number of outbound gossip messages to keep in the write buffer,
317 /// refilled as we send bytes.
318 const OUTBOUND_BUFFER_LIMIT_READ_PAUSE: usize = 12;
319 /// When the outbound buffer has this many messages, we'll simply skip relaying gossip messages to
321 const OUTBOUND_BUFFER_LIMIT_DROP_GOSSIP: usize = OUTBOUND_BUFFER_LIMIT_READ_PAUSE * FORWARD_INIT_SYNC_BUFFER_LIMIT_RATIO;
323 /// If we've sent a ping, and are still awaiting a response, we may need to churn our way through
324 /// the socket receive buffer before receiving the ping.
326 /// On a fairly old Arm64 board, with Linux defaults, this can take as long as 20 seconds, not
327 /// including any network delays, outbound traffic, or the same for messages from other peers.
329 /// Thus, to avoid needlessly disconnecting a peer, we allow a peer to take this many timer ticks
330 /// per connected peer to respond to a ping, as long as they send us at least one message during
331 /// each tick, ensuring we aren't actually just disconnected.
332 /// With a timer tick interval of ten seconds, this translates to about 40 seconds per connected
335 /// When we improve parallelism somewhat we should reduce this to e.g. this many timer ticks per
336 /// two connected peers, assuming most LDK-running systems have at least two cores.
337 const MAX_BUFFER_DRAIN_TICK_INTERVALS_PER_PEER: i8 = 4;
339 /// This is the minimum number of messages we expect a peer to be able to handle within one timer
340 /// tick. Once we have sent this many messages since the last ping, we send a ping right away to
341 /// ensures we don't just fill up our send buffer and leave the peer with too many messages to
342 /// process before the next ping.
344 /// Note that we continue responding to other messages even after we've sent this many messages, so
345 /// it's more of a general guideline used for gossip backfill (and gossip forwarding, times
346 /// [`FORWARD_INIT_SYNC_BUFFER_LIMIT_RATIO`]) than a hard limit.
347 const BUFFER_DRAIN_MSGS_PER_TICK: usize = 32;
350 channel_encryptor: PeerChannelEncryptor,
351 their_node_id: Option<PublicKey>,
352 their_features: Option<InitFeatures>,
353 their_net_address: Option<NetAddress>,
355 pending_outbound_buffer: LinkedList<Vec<u8>>,
356 pending_outbound_buffer_first_msg_offset: usize,
357 // Queue gossip broadcasts separately from `pending_outbound_buffer` so we can easily prioritize
358 // channel messages over them.
359 gossip_broadcast_buffer: LinkedList<Vec<u8>>,
360 awaiting_write_event: bool,
362 pending_read_buffer: Vec<u8>,
363 pending_read_buffer_pos: usize,
364 pending_read_is_header: bool,
366 sync_status: InitSyncTracker,
368 msgs_sent_since_pong: usize,
369 awaiting_pong_timer_tick_intervals: i8,
370 received_message_since_timer_tick: bool,
371 sent_gossip_timestamp_filter: bool,
375 /// Returns true if the channel announcements/updates for the given channel should be
376 /// forwarded to this peer.
377 /// If we are sending our routing table to this peer and we have not yet sent channel
378 /// announcements/updates for the given channel_id then we will send it when we get to that
379 /// point and we shouldn't send it yet to avoid sending duplicate updates. If we've already
380 /// sent the old versions, we should send the update, and so return true here.
381 fn should_forward_channel_announcement(&self, channel_id: u64) -> bool {
382 if self.their_features.as_ref().unwrap().supports_gossip_queries() &&
383 !self.sent_gossip_timestamp_filter {
386 match self.sync_status {
387 InitSyncTracker::NoSyncRequested => true,
388 InitSyncTracker::ChannelsSyncing(i) => i < channel_id,
389 InitSyncTracker::NodesSyncing(_) => true,
393 /// Similar to the above, but for node announcements indexed by node_id.
394 fn should_forward_node_announcement(&self, node_id: PublicKey) -> bool {
395 if self.their_features.as_ref().unwrap().supports_gossip_queries() &&
396 !self.sent_gossip_timestamp_filter {
399 match self.sync_status {
400 InitSyncTracker::NoSyncRequested => true,
401 InitSyncTracker::ChannelsSyncing(_) => false,
402 InitSyncTracker::NodesSyncing(pk) => pk < node_id,
406 /// Returns whether we should be reading bytes from this peer, based on whether its outbound
407 /// buffer still has space and we don't need to pause reads to get some writes out.
408 fn should_read(&self) -> bool {
409 self.pending_outbound_buffer.len() < OUTBOUND_BUFFER_LIMIT_READ_PAUSE
412 /// Determines if we should push additional gossip background sync (aka "backfill") onto a peer's
413 /// outbound buffer. This is checked every time the peer's buffer may have been drained.
414 fn should_buffer_gossip_backfill(&self) -> bool {
415 self.pending_outbound_buffer.is_empty() && self.gossip_broadcast_buffer.is_empty()
416 && self.msgs_sent_since_pong < BUFFER_DRAIN_MSGS_PER_TICK
419 /// Determines if we should push an onion message onto a peer's outbound buffer. This is checked
420 /// every time the peer's buffer may have been drained.
421 fn should_buffer_onion_message(&self) -> bool {
422 self.pending_outbound_buffer.is_empty()
423 && self.msgs_sent_since_pong < BUFFER_DRAIN_MSGS_PER_TICK
426 /// Determines if we should push additional gossip broadcast messages onto a peer's outbound
427 /// buffer. This is checked every time the peer's buffer may have been drained.
428 fn should_buffer_gossip_broadcast(&self) -> bool {
429 self.pending_outbound_buffer.is_empty()
430 && self.msgs_sent_since_pong < BUFFER_DRAIN_MSGS_PER_TICK
433 /// Returns whether this peer's outbound buffers are full and we should drop gossip broadcasts.
434 fn buffer_full_drop_gossip_broadcast(&self) -> bool {
435 let total_outbound_buffered =
436 self.gossip_broadcast_buffer.len() + self.pending_outbound_buffer.len();
438 total_outbound_buffered > OUTBOUND_BUFFER_LIMIT_DROP_GOSSIP ||
439 self.msgs_sent_since_pong > BUFFER_DRAIN_MSGS_PER_TICK * FORWARD_INIT_SYNC_BUFFER_LIMIT_RATIO
443 /// SimpleArcPeerManager is useful when you need a PeerManager with a static lifetime, e.g.
444 /// when you're using lightning-net-tokio (since tokio::spawn requires parameters with static
445 /// lifetimes). Other times you can afford a reference, which is more efficient, in which case
446 /// SimpleRefPeerManager is the more appropriate type. Defining these type aliases prevents
447 /// issues such as overly long function definitions.
449 /// (C-not exported) as Arcs don't make sense in bindings
450 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>>>, IgnoringMessageHandler, Arc<L>, Arc<IgnoringMessageHandler>>;
452 /// SimpleRefPeerManager is a type alias for a PeerManager reference, and is the reference
453 /// counterpart to the SimpleArcPeerManager type alias. Use this type by default when you don't
454 /// need a PeerManager with a static lifetime. You'll need a static lifetime in cases such as
455 /// usage of lightning-net-tokio (since tokio::spawn requires parameters with static lifetimes).
456 /// But if this is not necessary, using a reference is more efficient. Defining these type aliases
457 /// helps with issues such as long function definitions.
459 /// (C-not exported) as Arcs don't make sense in bindings
460 pub type SimpleRefPeerManager<'a, 'b, 'c, 'd, 'e, 'f, 'g, 'h, SD, M, T, F, C, L> = PeerManager<SD, SimpleRefChannelManager<'a, 'b, 'c, 'd, 'e, M, T, F, L>, &'e P2PGossipSync<&'g NetworkGraph<&'f L>, &'h C, &'f L>, IgnoringMessageHandler, &'f L, IgnoringMessageHandler>;
462 /// A PeerManager manages a set of peers, described by their [`SocketDescriptor`] and marshalls
463 /// socket events into messages which it passes on to its [`MessageHandler`].
465 /// Locks are taken internally, so you must never assume that reentrancy from a
466 /// [`SocketDescriptor`] call back into [`PeerManager`] methods will not deadlock.
468 /// Calls to [`read_event`] will decode relevant messages and pass them to the
469 /// [`ChannelMessageHandler`], likely doing message processing in-line. Thus, the primary form of
470 /// parallelism in Rust-Lightning is in calls to [`read_event`]. Note, however, that calls to any
471 /// [`PeerManager`] functions related to the same connection must occur only in serial, making new
472 /// calls only after previous ones have returned.
474 /// Rather than using a plain PeerManager, it is preferable to use either a SimpleArcPeerManager
475 /// a SimpleRefPeerManager, for conciseness. See their documentation for more details, but
476 /// essentially you should default to using a SimpleRefPeerManager, and use a
477 /// SimpleArcPeerManager when you require a PeerManager with a static lifetime, such as when
478 /// you're using lightning-net-tokio.
480 /// [`read_event`]: PeerManager::read_event
481 pub struct PeerManager<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, OM: Deref, L: Deref, CMH: Deref> where
482 CM::Target: ChannelMessageHandler,
483 RM::Target: RoutingMessageHandler,
484 OM::Target: OnionMessageHandler,
486 CMH::Target: CustomMessageHandler {
487 message_handler: MessageHandler<CM, RM, OM>,
488 /// Connection state for each connected peer - we have an outer read-write lock which is taken
489 /// as read while we're doing processing for a peer and taken write when a peer is being added
492 /// The inner Peer lock is held for sending and receiving bytes, but note that we do *not* hold
493 /// it while we're processing a message. This is fine as [`PeerManager::read_event`] requires
494 /// that there be no parallel calls for a given peer, so mutual exclusion of messages handed to
495 /// the `MessageHandler`s for a given peer is already guaranteed.
496 peers: FairRwLock<HashMap<Descriptor, Mutex<Peer>>>,
497 /// Only add to this set when noise completes.
498 /// Locked *after* peers. When an item is removed, it must be removed with the `peers` write
499 /// lock held. Entries may be added with only the `peers` read lock held (though the
500 /// `Descriptor` value must already exist in `peers`).
501 node_id_to_descriptor: Mutex<HashMap<PublicKey, Descriptor>>,
502 /// We can only have one thread processing events at once, but we don't usually need the full
503 /// `peers` write lock to do so, so instead we block on this empty mutex when entering
504 /// `process_events`.
505 event_processing_lock: Mutex<()>,
506 /// Because event processing is global and always does all available work before returning,
507 /// there is no reason for us to have many event processors waiting on the lock at once.
508 /// Instead, we limit the total blocked event processors to always exactly one by setting this
509 /// when an event process call is waiting.
510 blocked_event_processors: AtomicBool,
512 /// Used to track the last value sent in a node_announcement "timestamp" field. We ensure this
513 /// value increases strictly since we don't assume access to a time source.
514 last_node_announcement_serial: AtomicU64,
516 our_node_secret: SecretKey,
517 ephemeral_key_midstate: Sha256Engine,
518 custom_message_handler: CMH,
520 peer_counter: AtomicCounter,
523 secp_ctx: Secp256k1<secp256k1::SignOnly>
526 enum MessageHandlingError {
527 PeerHandleError(PeerHandleError),
528 LightningError(LightningError),
531 impl From<PeerHandleError> for MessageHandlingError {
532 fn from(error: PeerHandleError) -> Self {
533 MessageHandlingError::PeerHandleError(error)
537 impl From<LightningError> for MessageHandlingError {
538 fn from(error: LightningError) -> Self {
539 MessageHandlingError::LightningError(error)
543 macro_rules! encode_msg {
545 let mut buffer = VecWriter(Vec::new());
546 wire::write($msg, &mut buffer).unwrap();
551 impl<Descriptor: SocketDescriptor, CM: Deref, OM: Deref, L: Deref> PeerManager<Descriptor, CM, IgnoringMessageHandler, OM, L, IgnoringMessageHandler> where
552 CM::Target: ChannelMessageHandler,
553 OM::Target: OnionMessageHandler,
555 /// Constructs a new `PeerManager` with the given `ChannelMessageHandler` and
556 /// `OnionMessageHandler`. No routing message handler is used and network graph messages are
559 /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
560 /// cryptographically secure random bytes.
562 /// `current_time` is used as an always-increasing counter that survives across restarts and is
563 /// incremented irregularly internally. In general it is best to simply use the current UNIX
564 /// timestamp, however if it is not available a persistent counter that increases once per
565 /// minute should suffice.
567 /// (C-not exported) as we can't export a PeerManager with a dummy route handler
568 pub fn new_channel_only(channel_message_handler: CM, onion_message_handler: OM, our_node_secret: SecretKey, current_time: u64, ephemeral_random_data: &[u8; 32], logger: L) -> Self {
569 Self::new(MessageHandler {
570 chan_handler: channel_message_handler,
571 route_handler: IgnoringMessageHandler{},
572 onion_message_handler,
573 }, our_node_secret, current_time, ephemeral_random_data, logger, IgnoringMessageHandler{})
577 impl<Descriptor: SocketDescriptor, RM: Deref, L: Deref> PeerManager<Descriptor, ErroringMessageHandler, RM, IgnoringMessageHandler, L, IgnoringMessageHandler> where
578 RM::Target: RoutingMessageHandler,
580 /// Constructs a new `PeerManager` with the given `RoutingMessageHandler`. No channel message
581 /// handler or onion message handler is used and onion and channel messages will be ignored (or
582 /// generate error messages). Note that some other lightning implementations time-out connections
583 /// after some time if no channel is built with the peer.
585 /// `current_time` is used as an always-increasing counter that survives across restarts and is
586 /// incremented irregularly internally. In general it is best to simply use the current UNIX
587 /// timestamp, however if it is not available a persistent counter that increases once per
588 /// minute should suffice.
590 /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
591 /// cryptographically secure random bytes.
593 /// (C-not exported) as we can't export a PeerManager with a dummy channel handler
594 pub fn new_routing_only(routing_message_handler: RM, our_node_secret: SecretKey, current_time: u64, ephemeral_random_data: &[u8; 32], logger: L) -> Self {
595 Self::new(MessageHandler {
596 chan_handler: ErroringMessageHandler::new(),
597 route_handler: routing_message_handler,
598 onion_message_handler: IgnoringMessageHandler{},
599 }, our_node_secret, current_time, ephemeral_random_data, logger, IgnoringMessageHandler{})
603 /// A simple wrapper that optionally prints " from <pubkey>" for an optional pubkey.
604 /// This works around `format!()` taking a reference to each argument, preventing
605 /// `if let Some(node_id) = peer.their_node_id { format!(.., node_id) } else { .. }` from compiling
606 /// due to lifetime errors.
607 struct OptionalFromDebugger<'a>(&'a Option<PublicKey>);
608 impl core::fmt::Display for OptionalFromDebugger<'_> {
609 fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> Result<(), core::fmt::Error> {
610 if let Some(node_id) = self.0 { write!(f, " from {}", log_pubkey!(node_id)) } else { Ok(()) }
614 /// A function used to filter out local or private addresses
615 /// https://www.iana.org./assignments/ipv4-address-space/ipv4-address-space.xhtml
616 /// https://www.iana.org/assignments/ipv6-address-space/ipv6-address-space.xhtml
617 fn filter_addresses(ip_address: Option<NetAddress>) -> Option<NetAddress> {
619 // For IPv4 range 10.0.0.0 - 10.255.255.255 (10/8)
620 Some(NetAddress::IPv4{addr: [10, _, _, _], port: _}) => None,
621 // For IPv4 range 0.0.0.0 - 0.255.255.255 (0/8)
622 Some(NetAddress::IPv4{addr: [0, _, _, _], port: _}) => None,
623 // For IPv4 range 100.64.0.0 - 100.127.255.255 (100.64/10)
624 Some(NetAddress::IPv4{addr: [100, 64..=127, _, _], port: _}) => None,
625 // For IPv4 range 127.0.0.0 - 127.255.255.255 (127/8)
626 Some(NetAddress::IPv4{addr: [127, _, _, _], port: _}) => None,
627 // For IPv4 range 169.254.0.0 - 169.254.255.255 (169.254/16)
628 Some(NetAddress::IPv4{addr: [169, 254, _, _], port: _}) => None,
629 // For IPv4 range 172.16.0.0 - 172.31.255.255 (172.16/12)
630 Some(NetAddress::IPv4{addr: [172, 16..=31, _, _], port: _}) => None,
631 // For IPv4 range 192.168.0.0 - 192.168.255.255 (192.168/16)
632 Some(NetAddress::IPv4{addr: [192, 168, _, _], port: _}) => None,
633 // For IPv4 range 192.88.99.0 - 192.88.99.255 (192.88.99/24)
634 Some(NetAddress::IPv4{addr: [192, 88, 99, _], port: _}) => None,
635 // For IPv6 range 2000:0000:0000:0000:0000:0000:0000:0000 - 3fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff (2000::/3)
636 Some(NetAddress::IPv6{addr: [0x20..=0x3F, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _], port: _}) => ip_address,
637 // For remaining addresses
638 Some(NetAddress::IPv6{addr: _, port: _}) => None,
639 Some(..) => ip_address,
644 impl<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, OM: Deref, L: Deref, CMH: Deref> PeerManager<Descriptor, CM, RM, OM, L, CMH> where
645 CM::Target: ChannelMessageHandler,
646 RM::Target: RoutingMessageHandler,
647 OM::Target: OnionMessageHandler,
649 CMH::Target: CustomMessageHandler {
650 /// Constructs a new PeerManager with the given message handlers and node_id secret key
651 /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
652 /// cryptographically secure random bytes.
654 /// `current_time` is used as an always-increasing counter that survives across restarts and is
655 /// incremented irregularly internally. In general it is best to simply use the current UNIX
656 /// timestamp, however if it is not available a persistent counter that increases once per
657 /// minute should suffice.
658 pub fn new(message_handler: MessageHandler<CM, RM, OM>, our_node_secret: SecretKey, current_time: u64, ephemeral_random_data: &[u8; 32], logger: L, custom_message_handler: CMH) -> Self {
659 let mut ephemeral_key_midstate = Sha256::engine();
660 ephemeral_key_midstate.input(ephemeral_random_data);
662 let mut secp_ctx = Secp256k1::signing_only();
663 let ephemeral_hash = Sha256::from_engine(ephemeral_key_midstate.clone()).into_inner();
664 secp_ctx.seeded_randomize(&ephemeral_hash);
668 peers: FairRwLock::new(HashMap::new()),
669 node_id_to_descriptor: Mutex::new(HashMap::new()),
670 event_processing_lock: Mutex::new(()),
671 blocked_event_processors: AtomicBool::new(false),
673 ephemeral_key_midstate,
674 peer_counter: AtomicCounter::new(),
675 last_node_announcement_serial: AtomicU64::new(current_time),
677 custom_message_handler,
682 /// Get the list of node ids for peers which have completed the initial handshake.
684 /// For outbound connections, this will be the same as the their_node_id parameter passed in to
685 /// new_outbound_connection, however entries will only appear once the initial handshake has
686 /// completed and we are sure the remote peer has the private key for the given node_id.
687 pub fn get_peer_node_ids(&self) -> Vec<PublicKey> {
688 let peers = self.peers.read().unwrap();
689 peers.values().filter_map(|peer_mutex| {
690 let p = peer_mutex.lock().unwrap();
691 if !p.channel_encryptor.is_ready_for_encryption() || p.their_features.is_none() {
698 fn get_ephemeral_key(&self) -> SecretKey {
699 let mut ephemeral_hash = self.ephemeral_key_midstate.clone();
700 let counter = self.peer_counter.get_increment();
701 ephemeral_hash.input(&counter.to_le_bytes());
702 SecretKey::from_slice(&Sha256::from_engine(ephemeral_hash).into_inner()).expect("You broke SHA-256!")
705 /// Indicates a new outbound connection has been established to a node with the given node_id
706 /// and an optional remote network address.
708 /// The remote network address adds the option to report a remote IP address back to a connecting
709 /// peer using the init message.
710 /// The user should pass the remote network address of the host they are connected to.
712 /// If an `Err` is returned here you must disconnect the connection immediately.
714 /// Returns a small number of bytes to send to the remote node (currently always 50).
716 /// Panics if descriptor is duplicative with some other descriptor which has not yet been
717 /// [`socket_disconnected()`].
719 /// [`socket_disconnected()`]: PeerManager::socket_disconnected
720 pub fn new_outbound_connection(&self, their_node_id: PublicKey, descriptor: Descriptor, remote_network_address: Option<NetAddress>) -> Result<Vec<u8>, PeerHandleError> {
721 let mut peer_encryptor = PeerChannelEncryptor::new_outbound(their_node_id.clone(), self.get_ephemeral_key());
722 let res = peer_encryptor.get_act_one(&self.secp_ctx).to_vec();
723 let pending_read_buffer = [0; 50].to_vec(); // Noise act two is 50 bytes
725 let mut peers = self.peers.write().unwrap();
726 if peers.insert(descriptor, Mutex::new(Peer {
727 channel_encryptor: peer_encryptor,
729 their_features: None,
730 their_net_address: remote_network_address,
732 pending_outbound_buffer: LinkedList::new(),
733 pending_outbound_buffer_first_msg_offset: 0,
734 gossip_broadcast_buffer: LinkedList::new(),
735 awaiting_write_event: false,
738 pending_read_buffer_pos: 0,
739 pending_read_is_header: false,
741 sync_status: InitSyncTracker::NoSyncRequested,
743 msgs_sent_since_pong: 0,
744 awaiting_pong_timer_tick_intervals: 0,
745 received_message_since_timer_tick: false,
746 sent_gossip_timestamp_filter: false,
748 panic!("PeerManager driver duplicated descriptors!");
753 /// Indicates a new inbound connection has been established to a node with an optional remote
756 /// The remote network address adds the option to report a remote IP address back to a connecting
757 /// peer using the init message.
758 /// The user should pass the remote network address of the host they are connected to.
760 /// May refuse the connection by returning an Err, but will never write bytes to the remote end
761 /// (outbound connector always speaks first). If an `Err` is returned here you must disconnect
762 /// the connection immediately.
764 /// Panics if descriptor is duplicative with some other descriptor which has not yet been
765 /// [`socket_disconnected()`].
767 /// [`socket_disconnected()`]: PeerManager::socket_disconnected
768 pub fn new_inbound_connection(&self, descriptor: Descriptor, remote_network_address: Option<NetAddress>) -> Result<(), PeerHandleError> {
769 let peer_encryptor = PeerChannelEncryptor::new_inbound(&self.our_node_secret, &self.secp_ctx);
770 let pending_read_buffer = [0; 50].to_vec(); // Noise act one is 50 bytes
772 let mut peers = self.peers.write().unwrap();
773 if peers.insert(descriptor, Mutex::new(Peer {
774 channel_encryptor: peer_encryptor,
776 their_features: None,
777 their_net_address: remote_network_address,
779 pending_outbound_buffer: LinkedList::new(),
780 pending_outbound_buffer_first_msg_offset: 0,
781 gossip_broadcast_buffer: LinkedList::new(),
782 awaiting_write_event: false,
785 pending_read_buffer_pos: 0,
786 pending_read_is_header: false,
788 sync_status: InitSyncTracker::NoSyncRequested,
790 msgs_sent_since_pong: 0,
791 awaiting_pong_timer_tick_intervals: 0,
792 received_message_since_timer_tick: false,
793 sent_gossip_timestamp_filter: false,
795 panic!("PeerManager driver duplicated descriptors!");
800 fn do_attempt_write_data(&self, descriptor: &mut Descriptor, peer: &mut Peer) {
801 while !peer.awaiting_write_event {
802 if peer.should_buffer_onion_message() {
803 if let Some(peer_node_id) = peer.their_node_id {
804 if let Some(next_onion_message) =
805 self.message_handler.onion_message_handler.next_onion_message_for_peer(peer_node_id) {
806 self.enqueue_message(peer, &next_onion_message);
810 if peer.should_buffer_gossip_broadcast() {
811 if let Some(msg) = peer.gossip_broadcast_buffer.pop_front() {
812 peer.pending_outbound_buffer.push_back(msg);
815 if peer.should_buffer_gossip_backfill() {
816 match peer.sync_status {
817 InitSyncTracker::NoSyncRequested => {},
818 InitSyncTracker::ChannelsSyncing(c) if c < 0xffff_ffff_ffff_ffff => {
819 if let Some((announce, update_a_option, update_b_option)) =
820 self.message_handler.route_handler.get_next_channel_announcement(c)
822 self.enqueue_message(peer, &announce);
823 if let Some(update_a) = update_a_option {
824 self.enqueue_message(peer, &update_a);
826 if let Some(update_b) = update_b_option {
827 self.enqueue_message(peer, &update_b);
829 peer.sync_status = InitSyncTracker::ChannelsSyncing(announce.contents.short_channel_id + 1);
831 peer.sync_status = InitSyncTracker::ChannelsSyncing(0xffff_ffff_ffff_ffff);
834 InitSyncTracker::ChannelsSyncing(c) if c == 0xffff_ffff_ffff_ffff => {
835 if let Some(msg) = self.message_handler.route_handler.get_next_node_announcement(None) {
836 self.enqueue_message(peer, &msg);
837 peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
839 peer.sync_status = InitSyncTracker::NoSyncRequested;
842 InitSyncTracker::ChannelsSyncing(_) => unreachable!(),
843 InitSyncTracker::NodesSyncing(key) => {
844 if let Some(msg) = self.message_handler.route_handler.get_next_node_announcement(Some(&key)) {
845 self.enqueue_message(peer, &msg);
846 peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
848 peer.sync_status = InitSyncTracker::NoSyncRequested;
853 if peer.msgs_sent_since_pong >= BUFFER_DRAIN_MSGS_PER_TICK {
854 self.maybe_send_extra_ping(peer);
857 let next_buff = match peer.pending_outbound_buffer.front() {
862 let pending = &next_buff[peer.pending_outbound_buffer_first_msg_offset..];
863 let data_sent = descriptor.send_data(pending, peer.should_read());
864 peer.pending_outbound_buffer_first_msg_offset += data_sent;
865 if peer.pending_outbound_buffer_first_msg_offset == next_buff.len() {
866 peer.pending_outbound_buffer_first_msg_offset = 0;
867 peer.pending_outbound_buffer.pop_front();
869 peer.awaiting_write_event = true;
874 /// Indicates that there is room to write data to the given socket descriptor.
876 /// May return an Err to indicate that the connection should be closed.
878 /// May call [`send_data`] on the descriptor passed in (or an equal descriptor) before
879 /// returning. Thus, be very careful with reentrancy issues! The invariants around calling
880 /// [`write_buffer_space_avail`] in case a write did not fully complete must still hold - be
881 /// ready to call `[write_buffer_space_avail`] again if a write call generated here isn't
884 /// [`send_data`]: SocketDescriptor::send_data
885 /// [`write_buffer_space_avail`]: PeerManager::write_buffer_space_avail
886 pub fn write_buffer_space_avail(&self, descriptor: &mut Descriptor) -> Result<(), PeerHandleError> {
887 let peers = self.peers.read().unwrap();
888 match peers.get(descriptor) {
890 // This is most likely a simple race condition where the user found that the socket
891 // was writeable, then we told the user to `disconnect_socket()`, then they called
892 // this method. Return an error to make sure we get disconnected.
893 return Err(PeerHandleError { no_connection_possible: false });
895 Some(peer_mutex) => {
896 let mut peer = peer_mutex.lock().unwrap();
897 peer.awaiting_write_event = false;
898 self.do_attempt_write_data(descriptor, &mut peer);
904 /// Indicates that data was read from the given socket descriptor.
906 /// May return an Err to indicate that the connection should be closed.
908 /// Will *not* call back into [`send_data`] on any descriptors to avoid reentrancy complexity.
909 /// Thus, however, you should call [`process_events`] after any `read_event` to generate
910 /// [`send_data`] calls to handle responses.
912 /// If `Ok(true)` is returned, further read_events should not be triggered until a
913 /// [`send_data`] call on this descriptor has `resume_read` set (preventing DoS issues in the
916 /// [`send_data`]: SocketDescriptor::send_data
917 /// [`process_events`]: PeerManager::process_events
918 pub fn read_event(&self, peer_descriptor: &mut Descriptor, data: &[u8]) -> Result<bool, PeerHandleError> {
919 match self.do_read_event(peer_descriptor, data) {
922 log_trace!(self.logger, "Peer sent invalid data or we decided to disconnect due to a protocol error");
923 self.disconnect_event_internal(peer_descriptor, e.no_connection_possible);
929 /// Append a message to a peer's pending outbound/write buffer
930 fn enqueue_message<M: wire::Type>(&self, peer: &mut Peer, message: &M) {
931 let mut buffer = VecWriter(Vec::with_capacity(2048));
932 wire::write(message, &mut buffer).unwrap(); // crash if the write failed
934 if is_gossip_msg(message.type_id()) {
935 log_gossip!(self.logger, "Enqueueing message {:?} to {}", message, log_pubkey!(peer.their_node_id.unwrap()));
937 log_trace!(self.logger, "Enqueueing message {:?} to {}", message, log_pubkey!(peer.their_node_id.unwrap()))
939 peer.msgs_sent_since_pong += 1;
940 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&buffer.0[..]));
943 /// Append a message to a peer's pending outbound/write gossip broadcast buffer
944 fn enqueue_encoded_gossip_broadcast(&self, peer: &mut Peer, encoded_message: &Vec<u8>) {
945 peer.msgs_sent_since_pong += 1;
946 peer.gossip_broadcast_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_message[..]));
949 fn do_read_event(&self, peer_descriptor: &mut Descriptor, data: &[u8]) -> Result<bool, PeerHandleError> {
950 let mut pause_read = false;
951 let peers = self.peers.read().unwrap();
952 let mut msgs_to_forward = Vec::new();
953 let mut peer_node_id = None;
954 match peers.get(peer_descriptor) {
956 // This is most likely a simple race condition where the user read some bytes
957 // from the socket, then we told the user to `disconnect_socket()`, then they
958 // called this method. Return an error to make sure we get disconnected.
959 return Err(PeerHandleError { no_connection_possible: false });
961 Some(peer_mutex) => {
962 let mut read_pos = 0;
963 while read_pos < data.len() {
964 macro_rules! try_potential_handleerror {
965 ($peer: expr, $thing: expr) => {
970 msgs::ErrorAction::DisconnectPeer { msg: _ } => {
971 //TODO: Try to push msg
972 log_debug!(self.logger, "Error handling message{}; disconnecting peer with: {}", OptionalFromDebugger(&peer_node_id), e.err);
973 return Err(PeerHandleError{ no_connection_possible: false });
975 msgs::ErrorAction::IgnoreAndLog(level) => {
976 log_given_level!(self.logger, level, "Error handling message{}; ignoring: {}", OptionalFromDebugger(&peer_node_id), e.err);
979 msgs::ErrorAction::IgnoreDuplicateGossip => continue, // Don't even bother logging these
980 msgs::ErrorAction::IgnoreError => {
981 log_debug!(self.logger, "Error handling message{}; ignoring: {}", OptionalFromDebugger(&peer_node_id), e.err);
984 msgs::ErrorAction::SendErrorMessage { msg } => {
985 log_debug!(self.logger, "Error handling message{}; sending error message with: {}", OptionalFromDebugger(&peer_node_id), e.err);
986 self.enqueue_message($peer, &msg);
989 msgs::ErrorAction::SendWarningMessage { msg, log_level } => {
990 log_given_level!(self.logger, log_level, "Error handling message{}; sending warning message with: {}", OptionalFromDebugger(&peer_node_id), e.err);
991 self.enqueue_message($peer, &msg);
1000 let mut peer_lock = peer_mutex.lock().unwrap();
1001 let peer = &mut *peer_lock;
1002 let mut msg_to_handle = None;
1003 if peer_node_id.is_none() {
1004 peer_node_id = peer.their_node_id.clone();
1007 assert!(peer.pending_read_buffer.len() > 0);
1008 assert!(peer.pending_read_buffer.len() > peer.pending_read_buffer_pos);
1011 let data_to_copy = cmp::min(peer.pending_read_buffer.len() - peer.pending_read_buffer_pos, data.len() - read_pos);
1012 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]);
1013 read_pos += data_to_copy;
1014 peer.pending_read_buffer_pos += data_to_copy;
1017 if peer.pending_read_buffer_pos == peer.pending_read_buffer.len() {
1018 peer.pending_read_buffer_pos = 0;
1020 macro_rules! insert_node_id {
1022 match self.node_id_to_descriptor.lock().unwrap().entry(peer.their_node_id.unwrap()) {
1023 hash_map::Entry::Occupied(_) => {
1024 log_trace!(self.logger, "Got second connection with {}, closing", log_pubkey!(peer.their_node_id.unwrap()));
1025 peer.their_node_id = None; // Unset so that we don't generate a peer_disconnected event
1026 return Err(PeerHandleError{ no_connection_possible: false })
1028 hash_map::Entry::Vacant(entry) => {
1029 log_debug!(self.logger, "Finished noise handshake for connection with {}", log_pubkey!(peer.their_node_id.unwrap()));
1030 entry.insert(peer_descriptor.clone())
1036 let next_step = peer.channel_encryptor.get_noise_step();
1038 NextNoiseStep::ActOne => {
1039 let act_two = try_potential_handleerror!(peer, peer.channel_encryptor
1040 .process_act_one_with_keys(&peer.pending_read_buffer[..],
1041 &self.our_node_secret, self.get_ephemeral_key(), &self.secp_ctx)).to_vec();
1042 peer.pending_outbound_buffer.push_back(act_two);
1043 peer.pending_read_buffer = [0; 66].to_vec(); // act three is 66 bytes long
1045 NextNoiseStep::ActTwo => {
1046 let (act_three, their_node_id) = try_potential_handleerror!(peer,
1047 peer.channel_encryptor.process_act_two(&peer.pending_read_buffer[..],
1048 &self.our_node_secret, &self.secp_ctx));
1049 peer.pending_outbound_buffer.push_back(act_three.to_vec());
1050 peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
1051 peer.pending_read_is_header = true;
1053 peer.their_node_id = Some(their_node_id);
1055 let features = InitFeatures::known();
1056 let resp = msgs::Init { features, remote_network_address: filter_addresses(peer.their_net_address.clone()) };
1057 self.enqueue_message(peer, &resp);
1058 peer.awaiting_pong_timer_tick_intervals = 0;
1060 NextNoiseStep::ActThree => {
1061 let their_node_id = try_potential_handleerror!(peer,
1062 peer.channel_encryptor.process_act_three(&peer.pending_read_buffer[..]));
1063 peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
1064 peer.pending_read_is_header = true;
1065 peer.their_node_id = Some(their_node_id);
1067 let features = InitFeatures::known();
1068 let resp = msgs::Init { features, remote_network_address: filter_addresses(peer.their_net_address.clone()) };
1069 self.enqueue_message(peer, &resp);
1070 peer.awaiting_pong_timer_tick_intervals = 0;
1072 NextNoiseStep::NoiseComplete => {
1073 if peer.pending_read_is_header {
1074 let msg_len = try_potential_handleerror!(peer,
1075 peer.channel_encryptor.decrypt_length_header(&peer.pending_read_buffer[..]));
1076 if peer.pending_read_buffer.capacity() > 8192 { peer.pending_read_buffer = Vec::new(); }
1077 peer.pending_read_buffer.resize(msg_len as usize + 16, 0);
1078 if msg_len < 2 { // Need at least the message type tag
1079 return Err(PeerHandleError{ no_connection_possible: false });
1081 peer.pending_read_is_header = false;
1083 let msg_data = try_potential_handleerror!(peer,
1084 peer.channel_encryptor.decrypt_message(&peer.pending_read_buffer[..]));
1085 assert!(msg_data.len() >= 2);
1087 // Reset read buffer
1088 if peer.pending_read_buffer.capacity() > 8192 { peer.pending_read_buffer = Vec::new(); }
1089 peer.pending_read_buffer.resize(18, 0);
1090 peer.pending_read_is_header = true;
1092 let mut reader = io::Cursor::new(&msg_data[..]);
1093 let message_result = wire::read(&mut reader, &*self.custom_message_handler);
1094 let message = match message_result {
1098 // Note that to avoid recursion we never call
1099 // `do_attempt_write_data` from here, causing
1100 // the messages enqueued here to not actually
1101 // be sent before the peer is disconnected.
1102 (msgs::DecodeError::UnknownRequiredFeature, Some(ty)) if is_gossip_msg(ty) => {
1103 log_gossip!(self.logger, "Got a channel/node announcement with an unknown required feature flag, you may want to update!");
1106 (msgs::DecodeError::UnsupportedCompression, _) => {
1107 log_gossip!(self.logger, "We don't support zlib-compressed message fields, sending a warning and ignoring message");
1108 self.enqueue_message(peer, &msgs::WarningMessage { channel_id: [0; 32], data: "Unsupported message compression: zlib".to_owned() });
1111 (_, Some(ty)) if is_gossip_msg(ty) => {
1112 log_gossip!(self.logger, "Got an invalid value while deserializing a gossip message");
1113 self.enqueue_message(peer, &msgs::WarningMessage { channel_id: [0; 32], data: "Unreadable/bogus gossip message".to_owned() });
1116 (msgs::DecodeError::UnknownRequiredFeature, ty) => {
1117 log_gossip!(self.logger, "Received a message with an unknown required feature flag or TLV, you may want to update!");
1118 self.enqueue_message(peer, &msgs::WarningMessage { channel_id: [0; 32], data: format!("Received an unknown required feature/TLV in message type {:?}", ty) });
1119 return Err(PeerHandleError { no_connection_possible: false });
1121 (msgs::DecodeError::UnknownVersion, _) => return Err(PeerHandleError { no_connection_possible: false }),
1122 (msgs::DecodeError::InvalidValue, _) => {
1123 log_debug!(self.logger, "Got an invalid value while deserializing message");
1124 return Err(PeerHandleError { no_connection_possible: false });
1126 (msgs::DecodeError::ShortRead, _) => {
1127 log_debug!(self.logger, "Deserialization failed due to shortness of message");
1128 return Err(PeerHandleError { no_connection_possible: false });
1130 (msgs::DecodeError::BadLengthDescriptor, _) => return Err(PeerHandleError { no_connection_possible: false }),
1131 (msgs::DecodeError::Io(_), _) => return Err(PeerHandleError { no_connection_possible: false }),
1136 msg_to_handle = Some(message);
1141 pause_read = !peer.should_read();
1143 if let Some(message) = msg_to_handle {
1144 match self.handle_message(&peer_mutex, peer_lock, message) {
1145 Err(handling_error) => match handling_error {
1146 MessageHandlingError::PeerHandleError(e) => { return Err(e) },
1147 MessageHandlingError::LightningError(e) => {
1148 try_potential_handleerror!(&mut peer_mutex.lock().unwrap(), Err(e));
1152 msgs_to_forward.push(msg);
1161 for msg in msgs_to_forward.drain(..) {
1162 self.forward_broadcast_msg(&*peers, &msg, peer_node_id.as_ref());
1168 /// Process an incoming message and return a decision (ok, lightning error, peer handling error) regarding the next action with the peer
1169 /// Returns the message back if it needs to be broadcasted to all other peers.
1172 peer_mutex: &Mutex<Peer>,
1173 mut peer_lock: MutexGuard<Peer>,
1174 message: wire::Message<<<CMH as core::ops::Deref>::Target as wire::CustomMessageReader>::CustomMessage>
1175 ) -> Result<Option<wire::Message<<<CMH as core::ops::Deref>::Target as wire::CustomMessageReader>::CustomMessage>>, MessageHandlingError> {
1176 let their_node_id = peer_lock.their_node_id.clone().expect("We know the peer's public key by the time we receive messages");
1177 peer_lock.received_message_since_timer_tick = true;
1179 // Need an Init as first message
1180 if let wire::Message::Init(msg) = message {
1181 if msg.features.requires_unknown_bits() {
1182 log_debug!(self.logger, "Peer features required unknown version bits");
1183 return Err(PeerHandleError{ no_connection_possible: true }.into());
1185 if peer_lock.their_features.is_some() {
1186 return Err(PeerHandleError{ no_connection_possible: false }.into());
1189 log_info!(self.logger, "Received peer Init message from {}: {}", log_pubkey!(their_node_id), msg.features);
1191 // For peers not supporting gossip queries start sync now, otherwise wait until we receive a filter.
1192 if msg.features.initial_routing_sync() && !msg.features.supports_gossip_queries() {
1193 peer_lock.sync_status = InitSyncTracker::ChannelsSyncing(0);
1196 if !msg.features.supports_static_remote_key() {
1197 log_debug!(self.logger, "Peer {} does not support static remote key, disconnecting with no_connection_possible", log_pubkey!(their_node_id));
1198 return Err(PeerHandleError{ no_connection_possible: true }.into());
1201 self.message_handler.route_handler.peer_connected(&their_node_id, &msg);
1202 self.message_handler.chan_handler.peer_connected(&their_node_id, &msg);
1203 self.message_handler.onion_message_handler.peer_connected(&their_node_id, &msg);
1205 peer_lock.their_features = Some(msg.features);
1207 } else if peer_lock.their_features.is_none() {
1208 log_debug!(self.logger, "Peer {} sent non-Init first message", log_pubkey!(their_node_id));
1209 return Err(PeerHandleError{ no_connection_possible: false }.into());
1212 if let wire::Message::GossipTimestampFilter(_msg) = message {
1213 // When supporting gossip messages, start inital gossip sync only after we receive
1214 // a GossipTimestampFilter
1215 if peer_lock.their_features.as_ref().unwrap().supports_gossip_queries() &&
1216 !peer_lock.sent_gossip_timestamp_filter {
1217 peer_lock.sent_gossip_timestamp_filter = true;
1218 peer_lock.sync_status = InitSyncTracker::ChannelsSyncing(0);
1223 let their_features = peer_lock.their_features.clone();
1224 mem::drop(peer_lock);
1226 if is_gossip_msg(message.type_id()) {
1227 log_gossip!(self.logger, "Received message {:?} from {}", message, log_pubkey!(their_node_id));
1229 log_trace!(self.logger, "Received message {:?} from {}", message, log_pubkey!(their_node_id));
1232 let mut should_forward = None;
1235 // Setup and Control messages:
1236 wire::Message::Init(_) => {
1239 wire::Message::GossipTimestampFilter(_) => {
1242 wire::Message::Error(msg) => {
1243 let mut data_is_printable = true;
1244 for b in msg.data.bytes() {
1245 if b < 32 || b > 126 {
1246 data_is_printable = false;
1251 if data_is_printable {
1252 log_debug!(self.logger, "Got Err message from {}: {}", log_pubkey!(their_node_id), msg.data);
1254 log_debug!(self.logger, "Got Err message from {} with non-ASCII error message", log_pubkey!(their_node_id));
1256 self.message_handler.chan_handler.handle_error(&their_node_id, &msg);
1257 if msg.channel_id == [0; 32] {
1258 return Err(PeerHandleError{ no_connection_possible: true }.into());
1261 wire::Message::Warning(msg) => {
1262 let mut data_is_printable = true;
1263 for b in msg.data.bytes() {
1264 if b < 32 || b > 126 {
1265 data_is_printable = false;
1270 if data_is_printable {
1271 log_debug!(self.logger, "Got warning message from {}: {}", log_pubkey!(their_node_id), msg.data);
1273 log_debug!(self.logger, "Got warning message from {} with non-ASCII error message", log_pubkey!(their_node_id));
1277 wire::Message::Ping(msg) => {
1278 if msg.ponglen < 65532 {
1279 let resp = msgs::Pong { byteslen: msg.ponglen };
1280 self.enqueue_message(&mut *peer_mutex.lock().unwrap(), &resp);
1283 wire::Message::Pong(_msg) => {
1284 let mut peer_lock = peer_mutex.lock().unwrap();
1285 peer_lock.awaiting_pong_timer_tick_intervals = 0;
1286 peer_lock.msgs_sent_since_pong = 0;
1289 // Channel messages:
1290 wire::Message::OpenChannel(msg) => {
1291 self.message_handler.chan_handler.handle_open_channel(&their_node_id, their_features.clone().unwrap(), &msg);
1293 wire::Message::AcceptChannel(msg) => {
1294 self.message_handler.chan_handler.handle_accept_channel(&their_node_id, their_features.clone().unwrap(), &msg);
1297 wire::Message::FundingCreated(msg) => {
1298 self.message_handler.chan_handler.handle_funding_created(&their_node_id, &msg);
1300 wire::Message::FundingSigned(msg) => {
1301 self.message_handler.chan_handler.handle_funding_signed(&their_node_id, &msg);
1303 wire::Message::ChannelReady(msg) => {
1304 self.message_handler.chan_handler.handle_channel_ready(&their_node_id, &msg);
1307 wire::Message::Shutdown(msg) => {
1308 self.message_handler.chan_handler.handle_shutdown(&their_node_id, their_features.as_ref().unwrap(), &msg);
1310 wire::Message::ClosingSigned(msg) => {
1311 self.message_handler.chan_handler.handle_closing_signed(&their_node_id, &msg);
1314 // Commitment messages:
1315 wire::Message::UpdateAddHTLC(msg) => {
1316 self.message_handler.chan_handler.handle_update_add_htlc(&their_node_id, &msg);
1318 wire::Message::UpdateFulfillHTLC(msg) => {
1319 self.message_handler.chan_handler.handle_update_fulfill_htlc(&their_node_id, &msg);
1321 wire::Message::UpdateFailHTLC(msg) => {
1322 self.message_handler.chan_handler.handle_update_fail_htlc(&their_node_id, &msg);
1324 wire::Message::UpdateFailMalformedHTLC(msg) => {
1325 self.message_handler.chan_handler.handle_update_fail_malformed_htlc(&their_node_id, &msg);
1328 wire::Message::CommitmentSigned(msg) => {
1329 self.message_handler.chan_handler.handle_commitment_signed(&their_node_id, &msg);
1331 wire::Message::RevokeAndACK(msg) => {
1332 self.message_handler.chan_handler.handle_revoke_and_ack(&their_node_id, &msg);
1334 wire::Message::UpdateFee(msg) => {
1335 self.message_handler.chan_handler.handle_update_fee(&their_node_id, &msg);
1337 wire::Message::ChannelReestablish(msg) => {
1338 self.message_handler.chan_handler.handle_channel_reestablish(&their_node_id, &msg);
1341 // Routing messages:
1342 wire::Message::AnnouncementSignatures(msg) => {
1343 self.message_handler.chan_handler.handle_announcement_signatures(&their_node_id, &msg);
1345 wire::Message::ChannelAnnouncement(msg) => {
1346 if self.message_handler.route_handler.handle_channel_announcement(&msg)
1347 .map_err(|e| -> MessageHandlingError { e.into() })? {
1348 should_forward = Some(wire::Message::ChannelAnnouncement(msg));
1351 wire::Message::NodeAnnouncement(msg) => {
1352 if self.message_handler.route_handler.handle_node_announcement(&msg)
1353 .map_err(|e| -> MessageHandlingError { e.into() })? {
1354 should_forward = Some(wire::Message::NodeAnnouncement(msg));
1357 wire::Message::ChannelUpdate(msg) => {
1358 self.message_handler.chan_handler.handle_channel_update(&their_node_id, &msg);
1359 if self.message_handler.route_handler.handle_channel_update(&msg)
1360 .map_err(|e| -> MessageHandlingError { e.into() })? {
1361 should_forward = Some(wire::Message::ChannelUpdate(msg));
1364 wire::Message::QueryShortChannelIds(msg) => {
1365 self.message_handler.route_handler.handle_query_short_channel_ids(&their_node_id, msg)?;
1367 wire::Message::ReplyShortChannelIdsEnd(msg) => {
1368 self.message_handler.route_handler.handle_reply_short_channel_ids_end(&their_node_id, msg)?;
1370 wire::Message::QueryChannelRange(msg) => {
1371 self.message_handler.route_handler.handle_query_channel_range(&their_node_id, msg)?;
1373 wire::Message::ReplyChannelRange(msg) => {
1374 self.message_handler.route_handler.handle_reply_channel_range(&their_node_id, msg)?;
1378 wire::Message::OnionMessage(msg) => {
1379 self.message_handler.onion_message_handler.handle_onion_message(&their_node_id, &msg);
1382 // Unknown messages:
1383 wire::Message::Unknown(type_id) if message.is_even() => {
1384 log_debug!(self.logger, "Received unknown even message of type {}, disconnecting peer!", type_id);
1385 // Fail the channel if message is an even, unknown type as per BOLT #1.
1386 return Err(PeerHandleError{ no_connection_possible: true }.into());
1388 wire::Message::Unknown(type_id) => {
1389 log_trace!(self.logger, "Received unknown odd message of type {}, ignoring", type_id);
1391 wire::Message::Custom(custom) => {
1392 self.custom_message_handler.handle_custom_message(custom, &their_node_id)?;
1398 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>) {
1400 wire::Message::ChannelAnnouncement(ref msg) => {
1401 log_gossip!(self.logger, "Sending message to all peers except {:?} or the announced channel's counterparties: {:?}", except_node, msg);
1402 let encoded_msg = encode_msg!(msg);
1404 for (_, peer_mutex) in peers.iter() {
1405 let mut peer = peer_mutex.lock().unwrap();
1406 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1407 !peer.should_forward_channel_announcement(msg.contents.short_channel_id) {
1410 if peer.buffer_full_drop_gossip_broadcast() {
1411 log_gossip!(self.logger, "Skipping broadcast message to {:?} as its outbound buffer is full", peer.their_node_id);
1414 if peer.their_node_id.as_ref() == Some(&msg.contents.node_id_1) ||
1415 peer.their_node_id.as_ref() == Some(&msg.contents.node_id_2) {
1418 if except_node.is_some() && peer.their_node_id.as_ref() == except_node {
1421 self.enqueue_encoded_gossip_broadcast(&mut *peer, &encoded_msg);
1424 wire::Message::NodeAnnouncement(ref msg) => {
1425 log_gossip!(self.logger, "Sending message to all peers except {:?} or the announced node: {:?}", except_node, msg);
1426 let encoded_msg = encode_msg!(msg);
1428 for (_, peer_mutex) in peers.iter() {
1429 let mut peer = peer_mutex.lock().unwrap();
1430 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1431 !peer.should_forward_node_announcement(msg.contents.node_id) {
1434 if peer.buffer_full_drop_gossip_broadcast() {
1435 log_gossip!(self.logger, "Skipping broadcast message to {:?} as its outbound buffer is full", peer.their_node_id);
1438 if peer.their_node_id.as_ref() == Some(&msg.contents.node_id) {
1441 if except_node.is_some() && peer.their_node_id.as_ref() == except_node {
1444 self.enqueue_encoded_gossip_broadcast(&mut *peer, &encoded_msg);
1447 wire::Message::ChannelUpdate(ref msg) => {
1448 log_gossip!(self.logger, "Sending message to all peers except {:?}: {:?}", except_node, msg);
1449 let encoded_msg = encode_msg!(msg);
1451 for (_, peer_mutex) in peers.iter() {
1452 let mut peer = peer_mutex.lock().unwrap();
1453 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1454 !peer.should_forward_channel_announcement(msg.contents.short_channel_id) {
1457 if peer.buffer_full_drop_gossip_broadcast() {
1458 log_gossip!(self.logger, "Skipping broadcast message to {:?} as its outbound buffer is full", peer.their_node_id);
1461 if except_node.is_some() && peer.their_node_id.as_ref() == except_node {
1464 self.enqueue_encoded_gossip_broadcast(&mut *peer, &encoded_msg);
1467 _ => debug_assert!(false, "We shouldn't attempt to forward anything but gossip messages"),
1471 /// Checks for any events generated by our handlers and processes them. Includes sending most
1472 /// response messages as well as messages generated by calls to handler functions directly (eg
1473 /// functions like [`ChannelManager::process_pending_htlc_forwards`] or [`send_payment`]).
1475 /// May call [`send_data`] on [`SocketDescriptor`]s. Thus, be very careful with reentrancy
1478 /// You don't have to call this function explicitly if you are using [`lightning-net-tokio`]
1479 /// or one of the other clients provided in our language bindings.
1481 /// Note that if there are any other calls to this function waiting on lock(s) this may return
1482 /// without doing any work. All available events that need handling will be handled before the
1483 /// other calls return.
1485 /// [`send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
1486 /// [`ChannelManager::process_pending_htlc_forwards`]: crate::ln::channelmanager::ChannelManager::process_pending_htlc_forwards
1487 /// [`send_data`]: SocketDescriptor::send_data
1488 pub fn process_events(&self) {
1489 let mut _single_processor_lock = self.event_processing_lock.try_lock();
1490 if _single_processor_lock.is_err() {
1491 // While we could wake the older sleeper here with a CV and make more even waiting
1492 // times, that would be a lot of overengineering for a simple "reduce total waiter
1494 match self.blocked_event_processors.compare_exchange(false, true, Ordering::AcqRel, Ordering::Acquire) {
1496 debug_assert!(val, "compare_exchange failed spuriously?");
1500 debug_assert!(!val, "compare_exchange succeeded spuriously?");
1501 // We're the only waiter, as the running process_events may have emptied the
1502 // pending events "long" ago and there are new events for us to process, wait until
1503 // its done and process any leftover events before returning.
1504 _single_processor_lock = Ok(self.event_processing_lock.lock().unwrap());
1505 self.blocked_event_processors.store(false, Ordering::Release);
1510 let mut peers_to_disconnect = HashMap::new();
1511 let mut events_generated = self.message_handler.chan_handler.get_and_clear_pending_msg_events();
1512 events_generated.append(&mut self.message_handler.route_handler.get_and_clear_pending_msg_events());
1515 // TODO: There are some DoS attacks here where you can flood someone's outbound send
1516 // buffer by doing things like announcing channels on another node. We should be willing to
1517 // drop optional-ish messages when send buffers get full!
1519 let peers_lock = self.peers.read().unwrap();
1520 let peers = &*peers_lock;
1521 macro_rules! get_peer_for_forwarding {
1522 ($node_id: expr) => {
1524 if peers_to_disconnect.get($node_id).is_some() {
1525 // If we've "disconnected" this peer, do not send to it.
1528 let descriptor_opt = self.node_id_to_descriptor.lock().unwrap().get($node_id).cloned();
1529 match descriptor_opt {
1530 Some(descriptor) => match peers.get(&descriptor) {
1531 Some(peer_mutex) => {
1532 let peer_lock = peer_mutex.lock().unwrap();
1533 if peer_lock.their_features.is_none() {
1539 debug_assert!(false, "Inconsistent peers set state!");
1550 for event in events_generated.drain(..) {
1552 MessageSendEvent::SendAcceptChannel { ref node_id, ref msg } => {
1553 log_debug!(self.logger, "Handling SendAcceptChannel event in peer_handler for node {} for channel {}",
1554 log_pubkey!(node_id),
1555 log_bytes!(msg.temporary_channel_id));
1556 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1558 MessageSendEvent::SendOpenChannel { ref node_id, ref msg } => {
1559 log_debug!(self.logger, "Handling SendOpenChannel event in peer_handler for node {} for channel {}",
1560 log_pubkey!(node_id),
1561 log_bytes!(msg.temporary_channel_id));
1562 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1564 MessageSendEvent::SendFundingCreated { ref node_id, ref msg } => {
1565 log_debug!(self.logger, "Handling SendFundingCreated event in peer_handler for node {} for channel {} (which becomes {})",
1566 log_pubkey!(node_id),
1567 log_bytes!(msg.temporary_channel_id),
1568 log_funding_channel_id!(msg.funding_txid, msg.funding_output_index));
1569 // TODO: If the peer is gone we should generate a DiscardFunding event
1570 // indicating to the wallet that they should just throw away this funding transaction
1571 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1573 MessageSendEvent::SendFundingSigned { ref node_id, ref msg } => {
1574 log_debug!(self.logger, "Handling SendFundingSigned event in peer_handler for node {} for channel {}",
1575 log_pubkey!(node_id),
1576 log_bytes!(msg.channel_id));
1577 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1579 MessageSendEvent::SendChannelReady { ref node_id, ref msg } => {
1580 log_debug!(self.logger, "Handling SendChannelReady event in peer_handler for node {} for channel {}",
1581 log_pubkey!(node_id),
1582 log_bytes!(msg.channel_id));
1583 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1585 MessageSendEvent::SendAnnouncementSignatures { ref node_id, ref msg } => {
1586 log_debug!(self.logger, "Handling SendAnnouncementSignatures event in peer_handler for node {} for channel {})",
1587 log_pubkey!(node_id),
1588 log_bytes!(msg.channel_id));
1589 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1591 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 } } => {
1592 log_debug!(self.logger, "Handling UpdateHTLCs event in peer_handler for node {} with {} adds, {} fulfills, {} fails for channel {}",
1593 log_pubkey!(node_id),
1594 update_add_htlcs.len(),
1595 update_fulfill_htlcs.len(),
1596 update_fail_htlcs.len(),
1597 log_bytes!(commitment_signed.channel_id));
1598 let mut peer = get_peer_for_forwarding!(node_id);
1599 for msg in update_add_htlcs {
1600 self.enqueue_message(&mut *peer, msg);
1602 for msg in update_fulfill_htlcs {
1603 self.enqueue_message(&mut *peer, msg);
1605 for msg in update_fail_htlcs {
1606 self.enqueue_message(&mut *peer, msg);
1608 for msg in update_fail_malformed_htlcs {
1609 self.enqueue_message(&mut *peer, msg);
1611 if let &Some(ref msg) = update_fee {
1612 self.enqueue_message(&mut *peer, msg);
1614 self.enqueue_message(&mut *peer, commitment_signed);
1616 MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
1617 log_debug!(self.logger, "Handling SendRevokeAndACK event in peer_handler for node {} for channel {}",
1618 log_pubkey!(node_id),
1619 log_bytes!(msg.channel_id));
1620 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1622 MessageSendEvent::SendClosingSigned { ref node_id, ref msg } => {
1623 log_debug!(self.logger, "Handling SendClosingSigned event in peer_handler for node {} for channel {}",
1624 log_pubkey!(node_id),
1625 log_bytes!(msg.channel_id));
1626 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1628 MessageSendEvent::SendShutdown { ref node_id, ref msg } => {
1629 log_debug!(self.logger, "Handling Shutdown event in peer_handler for node {} for channel {}",
1630 log_pubkey!(node_id),
1631 log_bytes!(msg.channel_id));
1632 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1634 MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
1635 log_debug!(self.logger, "Handling SendChannelReestablish event in peer_handler for node {} for channel {}",
1636 log_pubkey!(node_id),
1637 log_bytes!(msg.channel_id));
1638 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1640 MessageSendEvent::SendChannelAnnouncement { ref node_id, ref msg, ref update_msg } => {
1641 log_debug!(self.logger, "Handling SendChannelAnnouncement event in peer_handler for node {} for short channel id {}",
1642 log_pubkey!(node_id),
1643 msg.contents.short_channel_id);
1644 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1645 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), update_msg);
1647 MessageSendEvent::BroadcastChannelAnnouncement { msg, update_msg } => {
1648 log_debug!(self.logger, "Handling BroadcastChannelAnnouncement event in peer_handler for short channel id {}", msg.contents.short_channel_id);
1649 match self.message_handler.route_handler.handle_channel_announcement(&msg) {
1650 Ok(_) | Err(LightningError { action: msgs::ErrorAction::IgnoreDuplicateGossip, .. }) =>
1651 self.forward_broadcast_msg(peers, &wire::Message::ChannelAnnouncement(msg), None),
1654 match self.message_handler.route_handler.handle_channel_update(&update_msg) {
1655 Ok(_) | Err(LightningError { action: msgs::ErrorAction::IgnoreDuplicateGossip, .. }) =>
1656 self.forward_broadcast_msg(peers, &wire::Message::ChannelUpdate(update_msg), None),
1660 MessageSendEvent::BroadcastChannelUpdate { msg } => {
1661 log_debug!(self.logger, "Handling BroadcastChannelUpdate event in peer_handler for short channel id {}", msg.contents.short_channel_id);
1662 match self.message_handler.route_handler.handle_channel_update(&msg) {
1663 Ok(_) | Err(LightningError { action: msgs::ErrorAction::IgnoreDuplicateGossip, .. }) =>
1664 self.forward_broadcast_msg(peers, &wire::Message::ChannelUpdate(msg), None),
1668 MessageSendEvent::SendChannelUpdate { ref node_id, ref msg } => {
1669 log_trace!(self.logger, "Handling SendChannelUpdate event in peer_handler for node {} for channel {}",
1670 log_pubkey!(node_id), msg.contents.short_channel_id);
1671 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1673 MessageSendEvent::HandleError { ref node_id, ref action } => {
1675 msgs::ErrorAction::DisconnectPeer { ref msg } => {
1676 // We do not have the peers write lock, so we just store that we're
1677 // about to disconenct the peer and do it after we finish
1678 // processing most messages.
1679 peers_to_disconnect.insert(*node_id, msg.clone());
1681 msgs::ErrorAction::IgnoreAndLog(level) => {
1682 log_given_level!(self.logger, level, "Received a HandleError event to be ignored for node {}", log_pubkey!(node_id));
1684 msgs::ErrorAction::IgnoreDuplicateGossip => {},
1685 msgs::ErrorAction::IgnoreError => {
1686 log_debug!(self.logger, "Received a HandleError event to be ignored for node {}", log_pubkey!(node_id));
1688 msgs::ErrorAction::SendErrorMessage { ref msg } => {
1689 log_trace!(self.logger, "Handling SendErrorMessage HandleError event in peer_handler for node {} with message {}",
1690 log_pubkey!(node_id),
1692 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1694 msgs::ErrorAction::SendWarningMessage { ref msg, ref log_level } => {
1695 log_given_level!(self.logger, *log_level, "Handling SendWarningMessage HandleError event in peer_handler for node {} with message {}",
1696 log_pubkey!(node_id),
1698 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1702 MessageSendEvent::SendChannelRangeQuery { ref node_id, ref msg } => {
1703 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1705 MessageSendEvent::SendShortIdsQuery { ref node_id, ref msg } => {
1706 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1708 MessageSendEvent::SendReplyChannelRange { ref node_id, ref msg } => {
1709 log_gossip!(self.logger, "Handling SendReplyChannelRange event in peer_handler for node {} with num_scids={} first_blocknum={} number_of_blocks={}, sync_complete={}",
1710 log_pubkey!(node_id),
1711 msg.short_channel_ids.len(),
1713 msg.number_of_blocks,
1715 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1717 MessageSendEvent::SendGossipTimestampFilter { ref node_id, ref msg } => {
1718 self.enqueue_message(&mut *get_peer_for_forwarding!(node_id), msg);
1723 for (node_id, msg) in self.custom_message_handler.get_and_clear_pending_msg() {
1724 if peers_to_disconnect.get(&node_id).is_some() { continue; }
1725 self.enqueue_message(&mut *get_peer_for_forwarding!(&node_id), &msg);
1728 for (descriptor, peer_mutex) in peers.iter() {
1729 self.do_attempt_write_data(&mut (*descriptor).clone(), &mut *peer_mutex.lock().unwrap());
1732 if !peers_to_disconnect.is_empty() {
1733 let mut peers_lock = self.peers.write().unwrap();
1734 let peers = &mut *peers_lock;
1735 for (node_id, msg) in peers_to_disconnect.drain() {
1736 // Note that since we are holding the peers *write* lock we can
1737 // remove from node_id_to_descriptor immediately (as no other
1738 // thread can be holding the peer lock if we have the global write
1741 if let Some(mut descriptor) = self.node_id_to_descriptor.lock().unwrap().remove(&node_id) {
1742 if let Some(peer_mutex) = peers.remove(&descriptor) {
1743 if let Some(msg) = msg {
1744 log_trace!(self.logger, "Handling DisconnectPeer HandleError event in peer_handler for node {} with message {}",
1745 log_pubkey!(node_id),
1747 let mut peer = peer_mutex.lock().unwrap();
1748 self.enqueue_message(&mut *peer, &msg);
1749 // This isn't guaranteed to work, but if there is enough free
1750 // room in the send buffer, put the error message there...
1751 self.do_attempt_write_data(&mut descriptor, &mut *peer);
1753 log_trace!(self.logger, "Handling DisconnectPeer HandleError event in peer_handler for node {} with no message", log_pubkey!(node_id));
1756 descriptor.disconnect_socket();
1757 self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1758 self.message_handler.onion_message_handler.peer_disconnected(&node_id, false);
1764 /// Indicates that the given socket descriptor's connection is now closed.
1765 pub fn socket_disconnected(&self, descriptor: &Descriptor) {
1766 self.disconnect_event_internal(descriptor, false);
1769 fn disconnect_event_internal(&self, descriptor: &Descriptor, no_connection_possible: bool) {
1770 let mut peers = self.peers.write().unwrap();
1771 let peer_option = peers.remove(descriptor);
1774 // This is most likely a simple race condition where the user found that the socket
1775 // was disconnected, then we told the user to `disconnect_socket()`, then they
1776 // called this method. Either way we're disconnected, return.
1778 Some(peer_lock) => {
1779 let peer = peer_lock.lock().unwrap();
1780 if let Some(node_id) = peer.their_node_id {
1781 log_trace!(self.logger,
1782 "Handling disconnection of peer {}, with {}future connection to the peer possible.",
1783 log_pubkey!(node_id), if no_connection_possible { "no " } else { "" });
1784 self.node_id_to_descriptor.lock().unwrap().remove(&node_id);
1785 self.message_handler.chan_handler.peer_disconnected(&node_id, no_connection_possible);
1786 self.message_handler.onion_message_handler.peer_disconnected(&node_id, no_connection_possible);
1792 /// Disconnect a peer given its node id.
1794 /// Set `no_connection_possible` to true to prevent any further connection with this peer,
1795 /// force-closing any channels we have with it.
1797 /// If a peer is connected, this will call [`disconnect_socket`] on the descriptor for the
1798 /// peer. Thus, be very careful about reentrancy issues.
1800 /// [`disconnect_socket`]: SocketDescriptor::disconnect_socket
1801 pub fn disconnect_by_node_id(&self, node_id: PublicKey, no_connection_possible: bool) {
1802 let mut peers_lock = self.peers.write().unwrap();
1803 if let Some(mut descriptor) = self.node_id_to_descriptor.lock().unwrap().remove(&node_id) {
1804 log_trace!(self.logger, "Disconnecting peer with id {} due to client request", node_id);
1805 peers_lock.remove(&descriptor);
1806 self.message_handler.chan_handler.peer_disconnected(&node_id, no_connection_possible);
1807 self.message_handler.onion_message_handler.peer_disconnected(&node_id, no_connection_possible);
1808 descriptor.disconnect_socket();
1812 /// Disconnects all currently-connected peers. This is useful on platforms where there may be
1813 /// an indication that TCP sockets have stalled even if we weren't around to time them out
1814 /// using regular ping/pongs.
1815 pub fn disconnect_all_peers(&self) {
1816 let mut peers_lock = self.peers.write().unwrap();
1817 self.node_id_to_descriptor.lock().unwrap().clear();
1818 let peers = &mut *peers_lock;
1819 for (mut descriptor, peer) in peers.drain() {
1820 if let Some(node_id) = peer.lock().unwrap().their_node_id {
1821 log_trace!(self.logger, "Disconnecting peer with id {} due to client request to disconnect all peers", node_id);
1822 self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1823 self.message_handler.onion_message_handler.peer_disconnected(&node_id, false);
1825 descriptor.disconnect_socket();
1829 /// This is called when we're blocked on sending additional gossip messages until we receive a
1830 /// pong. If we aren't waiting on a pong, we take this opportunity to send a ping (setting
1831 /// `awaiting_pong_timer_tick_intervals` to a special flag value to indicate this).
1832 fn maybe_send_extra_ping(&self, peer: &mut Peer) {
1833 if peer.awaiting_pong_timer_tick_intervals == 0 {
1834 peer.awaiting_pong_timer_tick_intervals = -1;
1835 let ping = msgs::Ping {
1839 self.enqueue_message(peer, &ping);
1843 /// Send pings to each peer and disconnect those which did not respond to the last round of
1846 /// This may be called on any timescale you want, however, roughly once every ten seconds is
1847 /// preferred. The call rate determines both how often we send a ping to our peers and how much
1848 /// time they have to respond before we disconnect them.
1850 /// May call [`send_data`] on all [`SocketDescriptor`]s. Thus, be very careful with reentrancy
1853 /// [`send_data`]: SocketDescriptor::send_data
1854 pub fn timer_tick_occurred(&self) {
1855 let mut descriptors_needing_disconnect = Vec::new();
1857 let peers_lock = self.peers.read().unwrap();
1859 for (descriptor, peer_mutex) in peers_lock.iter() {
1860 let mut peer = peer_mutex.lock().unwrap();
1861 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_node_id.is_none() {
1862 // The peer needs to complete its handshake before we can exchange messages. We
1863 // give peers one timer tick to complete handshake, reusing
1864 // `awaiting_pong_timer_tick_intervals` to track number of timer ticks taken
1865 // for handshake completion.
1866 if peer.awaiting_pong_timer_tick_intervals != 0 {
1867 descriptors_needing_disconnect.push(descriptor.clone());
1869 peer.awaiting_pong_timer_tick_intervals = 1;
1874 if peer.awaiting_pong_timer_tick_intervals == -1 {
1875 // Magic value set in `maybe_send_extra_ping`.
1876 peer.awaiting_pong_timer_tick_intervals = 1;
1877 peer.received_message_since_timer_tick = false;
1881 if (peer.awaiting_pong_timer_tick_intervals > 0 && !peer.received_message_since_timer_tick)
1882 || peer.awaiting_pong_timer_tick_intervals as u64 >
1883 MAX_BUFFER_DRAIN_TICK_INTERVALS_PER_PEER as u64 * peers_lock.len() as u64
1885 descriptors_needing_disconnect.push(descriptor.clone());
1888 peer.received_message_since_timer_tick = false;
1890 if peer.awaiting_pong_timer_tick_intervals > 0 {
1891 peer.awaiting_pong_timer_tick_intervals += 1;
1895 peer.awaiting_pong_timer_tick_intervals = 1;
1896 let ping = msgs::Ping {
1900 self.enqueue_message(&mut *peer, &ping);
1901 self.do_attempt_write_data(&mut (descriptor.clone()), &mut *peer);
1905 if !descriptors_needing_disconnect.is_empty() {
1907 let mut peers_lock = self.peers.write().unwrap();
1908 for descriptor in descriptors_needing_disconnect.iter() {
1909 if let Some(peer) = peers_lock.remove(descriptor) {
1910 if let Some(node_id) = peer.lock().unwrap().their_node_id {
1911 log_trace!(self.logger, "Disconnecting peer with id {} due to ping timeout", node_id);
1912 self.node_id_to_descriptor.lock().unwrap().remove(&node_id);
1913 self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1914 self.message_handler.onion_message_handler.peer_disconnected(&node_id, false);
1920 for mut descriptor in descriptors_needing_disconnect.drain(..) {
1921 descriptor.disconnect_socket();
1927 // Messages of up to 64KB should never end up more than half full with addresses, as that would
1928 // be absurd. We ensure this by checking that at least 100 (our stated public contract on when
1929 // broadcast_node_announcement panics) of the maximum-length addresses would fit in a 64KB
1931 const HALF_MESSAGE_IS_ADDRS: u32 = ::core::u16::MAX as u32 / (NetAddress::MAX_LEN as u32 + 1) / 2;
1934 // ...by failing to compile if the number of addresses that would be half of a message is
1935 // smaller than 100:
1936 const STATIC_ASSERT: u32 = Self::HALF_MESSAGE_IS_ADDRS - 100;
1938 /// Generates a signed node_announcement from the given arguments, sending it to all connected
1939 /// peers. Note that peers will likely ignore this message unless we have at least one public
1940 /// channel which has at least six confirmations on-chain.
1942 /// `rgb` is a node "color" and `alias` is a printable human-readable string to describe this
1943 /// node to humans. They carry no in-protocol meaning.
1945 /// `addresses` represent the set (possibly empty) of socket addresses on which this node
1946 /// accepts incoming connections. These will be included in the node_announcement, publicly
1947 /// tying these addresses together and to this node. If you wish to preserve user privacy,
1948 /// addresses should likely contain only Tor Onion addresses.
1950 /// Panics if `addresses` is absurdly large (more than 100).
1952 /// [`get_and_clear_pending_msg_events`]: MessageSendEventsProvider::get_and_clear_pending_msg_events
1953 pub fn broadcast_node_announcement(&self, rgb: [u8; 3], alias: [u8; 32], mut addresses: Vec<NetAddress>) {
1954 if addresses.len() > 100 {
1955 panic!("More than half the message size was taken up by public addresses!");
1958 // While all existing nodes handle unsorted addresses just fine, the spec requires that
1959 // addresses be sorted for future compatibility.
1960 addresses.sort_by_key(|addr| addr.get_id());
1962 let announcement = msgs::UnsignedNodeAnnouncement {
1963 features: self.message_handler.chan_handler.provided_node_features(),
1964 timestamp: self.last_node_announcement_serial.fetch_add(1, Ordering::AcqRel) as u32,
1965 node_id: PublicKey::from_secret_key(&self.secp_ctx, &self.our_node_secret),
1966 rgb, alias, addresses,
1967 excess_address_data: Vec::new(),
1968 excess_data: Vec::new(),
1970 let msghash = hash_to_message!(&Sha256dHash::hash(&announcement.encode()[..])[..]);
1971 let node_announce_sig = sign(&self.secp_ctx, &msghash, &self.our_node_secret);
1973 let msg = msgs::NodeAnnouncement {
1974 signature: node_announce_sig,
1975 contents: announcement
1978 log_debug!(self.logger, "Broadcasting NodeAnnouncement after passing it to our own RoutingMessageHandler.");
1979 let _ = self.message_handler.route_handler.handle_node_announcement(&msg);
1980 self.forward_broadcast_msg(&*self.peers.read().unwrap(), &wire::Message::NodeAnnouncement(msg), None);
1984 fn is_gossip_msg(type_id: u16) -> bool {
1986 msgs::ChannelAnnouncement::TYPE |
1987 msgs::ChannelUpdate::TYPE |
1988 msgs::NodeAnnouncement::TYPE |
1989 msgs::QueryChannelRange::TYPE |
1990 msgs::ReplyChannelRange::TYPE |
1991 msgs::QueryShortChannelIds::TYPE |
1992 msgs::ReplyShortChannelIdsEnd::TYPE => true,
1999 use ln::peer_handler::{PeerManager, MessageHandler, SocketDescriptor, IgnoringMessageHandler, filter_addresses};
2000 use ln::{msgs, wire};
2001 use ln::msgs::NetAddress;
2003 use util::test_utils;
2005 use bitcoin::secp256k1::Secp256k1;
2006 use bitcoin::secp256k1::{SecretKey, PublicKey};
2009 use sync::{Arc, Mutex};
2010 use core::sync::atomic::Ordering;
2013 struct FileDescriptor {
2015 outbound_data: Arc<Mutex<Vec<u8>>>,
2017 impl PartialEq for FileDescriptor {
2018 fn eq(&self, other: &Self) -> bool {
2022 impl Eq for FileDescriptor { }
2023 impl core::hash::Hash for FileDescriptor {
2024 fn hash<H: core::hash::Hasher>(&self, hasher: &mut H) {
2025 self.fd.hash(hasher)
2029 impl SocketDescriptor for FileDescriptor {
2030 fn send_data(&mut self, data: &[u8], _resume_read: bool) -> usize {
2031 self.outbound_data.lock().unwrap().extend_from_slice(data);
2035 fn disconnect_socket(&mut self) {}
2038 struct PeerManagerCfg {
2039 chan_handler: test_utils::TestChannelMessageHandler,
2040 routing_handler: test_utils::TestRoutingMessageHandler,
2041 logger: test_utils::TestLogger,
2044 fn create_peermgr_cfgs(peer_count: usize) -> Vec<PeerManagerCfg> {
2045 let mut cfgs = Vec::new();
2046 for _ in 0..peer_count {
2049 chan_handler: test_utils::TestChannelMessageHandler::new(),
2050 logger: test_utils::TestLogger::new(),
2051 routing_handler: test_utils::TestRoutingMessageHandler::new(),
2059 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>> {
2060 let mut peers = Vec::new();
2061 for i in 0..peer_count {
2062 let node_secret = SecretKey::from_slice(&[42 + i as u8; 32]).unwrap();
2063 let ephemeral_bytes = [i as u8; 32];
2064 let msg_handler = MessageHandler { chan_handler: &cfgs[i].chan_handler, route_handler: &cfgs[i].routing_handler, onion_message_handler: IgnoringMessageHandler {} };
2065 let peer = PeerManager::new(msg_handler, node_secret, 0, &ephemeral_bytes, &cfgs[i].logger, IgnoringMessageHandler {});
2072 fn establish_connection<'a>(peer_a: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, IgnoringMessageHandler, &'a test_utils::TestLogger, IgnoringMessageHandler>, peer_b: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, IgnoringMessageHandler, &'a test_utils::TestLogger, IgnoringMessageHandler>) -> (FileDescriptor, FileDescriptor) {
2073 let secp_ctx = Secp256k1::new();
2074 let a_id = PublicKey::from_secret_key(&secp_ctx, &peer_a.our_node_secret);
2075 let mut fd_a = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
2076 let mut fd_b = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
2077 let initial_data = peer_b.new_outbound_connection(a_id, fd_b.clone(), None).unwrap();
2078 peer_a.new_inbound_connection(fd_a.clone(), None).unwrap();
2079 assert_eq!(peer_a.read_event(&mut fd_a, &initial_data).unwrap(), false);
2080 peer_a.process_events();
2082 let a_data = fd_a.outbound_data.lock().unwrap().split_off(0);
2083 assert_eq!(peer_b.read_event(&mut fd_b, &a_data).unwrap(), false);
2085 peer_b.process_events();
2086 let b_data = fd_b.outbound_data.lock().unwrap().split_off(0);
2087 assert_eq!(peer_a.read_event(&mut fd_a, &b_data).unwrap(), false);
2089 peer_a.process_events();
2090 let a_data = fd_a.outbound_data.lock().unwrap().split_off(0);
2091 assert_eq!(peer_b.read_event(&mut fd_b, &a_data).unwrap(), false);
2093 (fd_a.clone(), fd_b.clone())
2097 fn test_disconnect_peer() {
2098 // Simple test which builds a network of PeerManager, connects and brings them to NoiseState::Finished and
2099 // push a DisconnectPeer event to remove the node flagged by id
2100 let cfgs = create_peermgr_cfgs(2);
2101 let chan_handler = test_utils::TestChannelMessageHandler::new();
2102 let mut peers = create_network(2, &cfgs);
2103 establish_connection(&peers[0], &peers[1]);
2104 assert_eq!(peers[0].peers.read().unwrap().len(), 1);
2106 let secp_ctx = Secp256k1::new();
2107 let their_id = PublicKey::from_secret_key(&secp_ctx, &peers[1].our_node_secret);
2109 chan_handler.pending_events.lock().unwrap().push(events::MessageSendEvent::HandleError {
2111 action: msgs::ErrorAction::DisconnectPeer { msg: None },
2113 assert_eq!(chan_handler.pending_events.lock().unwrap().len(), 1);
2114 peers[0].message_handler.chan_handler = &chan_handler;
2116 peers[0].process_events();
2117 assert_eq!(peers[0].peers.read().unwrap().len(), 0);
2121 fn test_send_simple_msg() {
2122 // Simple test which builds a network of PeerManager, connects and brings them to NoiseState::Finished and
2123 // push a message from one peer to another.
2124 let cfgs = create_peermgr_cfgs(2);
2125 let a_chan_handler = test_utils::TestChannelMessageHandler::new();
2126 let b_chan_handler = test_utils::TestChannelMessageHandler::new();
2127 let mut peers = create_network(2, &cfgs);
2128 let (fd_a, mut fd_b) = establish_connection(&peers[0], &peers[1]);
2129 assert_eq!(peers[0].peers.read().unwrap().len(), 1);
2131 let secp_ctx = Secp256k1::new();
2132 let their_id = PublicKey::from_secret_key(&secp_ctx, &peers[1].our_node_secret);
2134 let msg = msgs::Shutdown { channel_id: [42; 32], scriptpubkey: bitcoin::Script::new() };
2135 a_chan_handler.pending_events.lock().unwrap().push(events::MessageSendEvent::SendShutdown {
2136 node_id: their_id, msg: msg.clone()
2138 peers[0].message_handler.chan_handler = &a_chan_handler;
2140 b_chan_handler.expect_receive_msg(wire::Message::Shutdown(msg));
2141 peers[1].message_handler.chan_handler = &b_chan_handler;
2143 peers[0].process_events();
2145 let a_data = fd_a.outbound_data.lock().unwrap().split_off(0);
2146 assert_eq!(peers[1].read_event(&mut fd_b, &a_data).unwrap(), false);
2150 fn test_disconnect_all_peer() {
2151 // Simple test which builds a network of PeerManager, connects and brings them to NoiseState::Finished and
2152 // then calls disconnect_all_peers
2153 let cfgs = create_peermgr_cfgs(2);
2154 let peers = create_network(2, &cfgs);
2155 establish_connection(&peers[0], &peers[1]);
2156 assert_eq!(peers[0].peers.read().unwrap().len(), 1);
2158 peers[0].disconnect_all_peers();
2159 assert_eq!(peers[0].peers.read().unwrap().len(), 0);
2163 fn test_timer_tick_occurred() {
2164 // Create peers, a vector of two peer managers, perform initial set up and check that peers[0] has one Peer.
2165 let cfgs = create_peermgr_cfgs(2);
2166 let peers = create_network(2, &cfgs);
2167 establish_connection(&peers[0], &peers[1]);
2168 assert_eq!(peers[0].peers.read().unwrap().len(), 1);
2170 // peers[0] awaiting_pong is set to true, but the Peer is still connected
2171 peers[0].timer_tick_occurred();
2172 peers[0].process_events();
2173 assert_eq!(peers[0].peers.read().unwrap().len(), 1);
2175 // Since timer_tick_occurred() is called again when awaiting_pong is true, all Peers are disconnected
2176 peers[0].timer_tick_occurred();
2177 peers[0].process_events();
2178 assert_eq!(peers[0].peers.read().unwrap().len(), 0);
2182 fn test_do_attempt_write_data() {
2183 // Create 2 peers with custom TestRoutingMessageHandlers and connect them.
2184 let cfgs = create_peermgr_cfgs(2);
2185 cfgs[0].routing_handler.request_full_sync.store(true, Ordering::Release);
2186 cfgs[1].routing_handler.request_full_sync.store(true, Ordering::Release);
2187 let peers = create_network(2, &cfgs);
2189 // By calling establish_connect, we trigger do_attempt_write_data between
2190 // the peers. Previously this function would mistakenly enter an infinite loop
2191 // when there were more channel messages available than could fit into a peer's
2192 // buffer. This issue would now be detected by this test (because we use custom
2193 // RoutingMessageHandlers that intentionally return more channel messages
2194 // than can fit into a peer's buffer).
2195 let (mut fd_a, mut fd_b) = establish_connection(&peers[0], &peers[1]);
2197 // Make each peer to read the messages that the other peer just wrote to them. Note that
2198 // due to the max-message-before-ping limits this may take a few iterations to complete.
2199 for _ in 0..150/super::BUFFER_DRAIN_MSGS_PER_TICK + 1 {
2200 peers[1].process_events();
2201 let a_read_data = fd_b.outbound_data.lock().unwrap().split_off(0);
2202 assert!(!a_read_data.is_empty());
2204 peers[0].read_event(&mut fd_a, &a_read_data).unwrap();
2205 peers[0].process_events();
2207 let b_read_data = fd_a.outbound_data.lock().unwrap().split_off(0);
2208 assert!(!b_read_data.is_empty());
2209 peers[1].read_event(&mut fd_b, &b_read_data).unwrap();
2211 peers[0].process_events();
2212 assert_eq!(fd_a.outbound_data.lock().unwrap().len(), 0, "Until A receives data, it shouldn't send more messages");
2215 // Check that each peer has received the expected number of channel updates and channel
2217 assert_eq!(cfgs[0].routing_handler.chan_upds_recvd.load(Ordering::Acquire), 108);
2218 assert_eq!(cfgs[0].routing_handler.chan_anns_recvd.load(Ordering::Acquire), 54);
2219 assert_eq!(cfgs[1].routing_handler.chan_upds_recvd.load(Ordering::Acquire), 108);
2220 assert_eq!(cfgs[1].routing_handler.chan_anns_recvd.load(Ordering::Acquire), 54);
2224 fn test_handshake_timeout() {
2225 // Tests that we time out a peer still waiting on handshake completion after a full timer
2227 let cfgs = create_peermgr_cfgs(2);
2228 cfgs[0].routing_handler.request_full_sync.store(true, Ordering::Release);
2229 cfgs[1].routing_handler.request_full_sync.store(true, Ordering::Release);
2230 let peers = create_network(2, &cfgs);
2232 let secp_ctx = Secp256k1::new();
2233 let a_id = PublicKey::from_secret_key(&secp_ctx, &peers[0].our_node_secret);
2234 let mut fd_a = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
2235 let mut fd_b = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
2236 let initial_data = peers[1].new_outbound_connection(a_id, fd_b.clone(), None).unwrap();
2237 peers[0].new_inbound_connection(fd_a.clone(), None).unwrap();
2239 // If we get a single timer tick before completion, that's fine
2240 assert_eq!(peers[0].peers.read().unwrap().len(), 1);
2241 peers[0].timer_tick_occurred();
2242 assert_eq!(peers[0].peers.read().unwrap().len(), 1);
2244 assert_eq!(peers[0].read_event(&mut fd_a, &initial_data).unwrap(), false);
2245 peers[0].process_events();
2246 let a_data = fd_a.outbound_data.lock().unwrap().split_off(0);
2247 assert_eq!(peers[1].read_event(&mut fd_b, &a_data).unwrap(), false);
2248 peers[1].process_events();
2250 // ...but if we get a second timer tick, we should disconnect the peer
2251 peers[0].timer_tick_occurred();
2252 assert_eq!(peers[0].peers.read().unwrap().len(), 0);
2254 let b_data = fd_b.outbound_data.lock().unwrap().split_off(0);
2255 assert!(peers[0].read_event(&mut fd_a, &b_data).is_err());
2259 fn test_filter_addresses(){
2260 // Tests the filter_addresses function.
2263 let ip_address = NetAddress::IPv4{addr: [10, 0, 0, 0], port: 1000};
2264 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2265 let ip_address = NetAddress::IPv4{addr: [10, 0, 255, 201], port: 1000};
2266 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2267 let ip_address = NetAddress::IPv4{addr: [10, 255, 255, 255], port: 1000};
2268 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2271 let ip_address = NetAddress::IPv4{addr: [0, 0, 0, 0], port: 1000};
2272 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2273 let ip_address = NetAddress::IPv4{addr: [0, 0, 255, 187], port: 1000};
2274 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2275 let ip_address = NetAddress::IPv4{addr: [0, 255, 255, 255], port: 1000};
2276 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2279 let ip_address = NetAddress::IPv4{addr: [100, 64, 0, 0], port: 1000};
2280 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2281 let ip_address = NetAddress::IPv4{addr: [100, 78, 255, 0], port: 1000};
2282 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2283 let ip_address = NetAddress::IPv4{addr: [100, 127, 255, 255], port: 1000};
2284 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2287 let ip_address = NetAddress::IPv4{addr: [127, 0, 0, 0], port: 1000};
2288 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2289 let ip_address = NetAddress::IPv4{addr: [127, 65, 73, 0], port: 1000};
2290 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2291 let ip_address = NetAddress::IPv4{addr: [127, 255, 255, 255], port: 1000};
2292 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2295 let ip_address = NetAddress::IPv4{addr: [169, 254, 0, 0], port: 1000};
2296 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2297 let ip_address = NetAddress::IPv4{addr: [169, 254, 221, 101], port: 1000};
2298 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2299 let ip_address = NetAddress::IPv4{addr: [169, 254, 255, 255], port: 1000};
2300 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2303 let ip_address = NetAddress::IPv4{addr: [172, 16, 0, 0], port: 1000};
2304 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2305 let ip_address = NetAddress::IPv4{addr: [172, 27, 101, 23], port: 1000};
2306 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2307 let ip_address = NetAddress::IPv4{addr: [172, 31, 255, 255], port: 1000};
2308 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2311 let ip_address = NetAddress::IPv4{addr: [192, 168, 0, 0], port: 1000};
2312 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2313 let ip_address = NetAddress::IPv4{addr: [192, 168, 205, 159], port: 1000};
2314 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2315 let ip_address = NetAddress::IPv4{addr: [192, 168, 255, 255], port: 1000};
2316 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2318 // For (192.88.99/24)
2319 let ip_address = NetAddress::IPv4{addr: [192, 88, 99, 0], port: 1000};
2320 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2321 let ip_address = NetAddress::IPv4{addr: [192, 88, 99, 140], port: 1000};
2322 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2323 let ip_address = NetAddress::IPv4{addr: [192, 88, 99, 255], port: 1000};
2324 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2326 // For other IPv4 addresses
2327 let ip_address = NetAddress::IPv4{addr: [188, 255, 99, 0], port: 1000};
2328 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2329 let ip_address = NetAddress::IPv4{addr: [123, 8, 129, 14], port: 1000};
2330 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2331 let ip_address = NetAddress::IPv4{addr: [2, 88, 9, 255], port: 1000};
2332 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2335 let ip_address = NetAddress::IPv6{addr: [32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], port: 1000};
2336 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2337 let ip_address = NetAddress::IPv6{addr: [45, 34, 209, 190, 0, 123, 55, 34, 0, 0, 3, 27, 201, 0, 0, 0], port: 1000};
2338 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2339 let ip_address = NetAddress::IPv6{addr: [63, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], port: 1000};
2340 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2342 // For other IPv6 addresses
2343 let ip_address = NetAddress::IPv6{addr: [24, 240, 12, 32, 0, 0, 0, 0, 20, 97, 0, 32, 121, 254, 0, 0], port: 1000};
2344 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2345 let ip_address = NetAddress::IPv6{addr: [68, 23, 56, 63, 0, 0, 2, 7, 75, 109, 0, 39, 0, 0, 0, 0], port: 1000};
2346 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2347 let ip_address = NetAddress::IPv6{addr: [101, 38, 140, 230, 100, 0, 30, 98, 0, 26, 0, 0, 57, 96, 0, 0], port: 1000};
2348 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2351 assert_eq!(filter_addresses(None), None);