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 NetGraphmsgHandler) with messages
16 //! they should handle, and encoding/sending response messages.
18 use bitcoin::secp256k1::key::{SecretKey,PublicKey};
20 use ln::features::InitFeatures;
22 use ln::msgs::{ChannelMessageHandler, LightningError, NetAddress, RoutingMessageHandler};
23 use ln::channelmanager::{SimpleArcChannelManager, SimpleRefChannelManager};
24 use util::ser::{VecWriter, Writeable, Writer};
25 use ln::peer_channel_encryptor::{PeerChannelEncryptor,NextNoiseStep};
28 use util::atomic_counter::AtomicCounter;
29 use util::events::{MessageSendEvent, MessageSendEventsProvider};
30 use util::logger::Logger;
31 use routing::network_graph::{NetworkGraph, NetGraphMsgHandler};
35 use alloc::collections::LinkedList;
36 use sync::{Arc, Mutex};
37 use core::{cmp, hash, fmt, mem};
39 use core::convert::Infallible;
40 #[cfg(feature = "std")] use std::error;
42 use bitcoin::hashes::sha256::Hash as Sha256;
43 use bitcoin::hashes::sha256::HashEngine as Sha256Engine;
44 use bitcoin::hashes::{HashEngine, Hash};
46 /// Handler for BOLT1-compliant messages.
47 pub trait CustomMessageHandler: wire::CustomMessageReader {
48 /// Called with the message type that was received and the buffer to be read.
49 /// Can return a `MessageHandlingError` if the message could not be handled.
50 fn handle_custom_message(&self, msg: Self::CustomMessage, sender_node_id: &PublicKey) -> Result<(), LightningError>;
52 /// Gets the list of pending messages which were generated by the custom message
53 /// handler, clearing the list in the process. The first tuple element must
54 /// correspond to the intended recipients node ids. If no connection to one of the
55 /// specified node does not exist, the message is simply not sent to it.
56 fn get_and_clear_pending_msg(&self) -> Vec<(PublicKey, Self::CustomMessage)>;
59 /// A dummy struct which implements `RoutingMessageHandler` without storing any routing information
60 /// or doing any processing. You can provide one of these as the route_handler in a MessageHandler.
61 pub struct IgnoringMessageHandler{}
62 impl MessageSendEventsProvider for IgnoringMessageHandler {
63 fn get_and_clear_pending_msg_events(&self) -> Vec<MessageSendEvent> { Vec::new() }
65 impl RoutingMessageHandler for IgnoringMessageHandler {
66 fn handle_node_announcement(&self, _msg: &msgs::NodeAnnouncement) -> Result<bool, LightningError> { Ok(false) }
67 fn handle_channel_announcement(&self, _msg: &msgs::ChannelAnnouncement) -> Result<bool, LightningError> { Ok(false) }
68 fn handle_channel_update(&self, _msg: &msgs::ChannelUpdate) -> Result<bool, LightningError> { Ok(false) }
69 fn get_next_channel_announcements(&self, _starting_point: u64, _batch_amount: u8) ->
70 Vec<(msgs::ChannelAnnouncement, Option<msgs::ChannelUpdate>, Option<msgs::ChannelUpdate>)> { Vec::new() }
71 fn get_next_node_announcements(&self, _starting_point: Option<&PublicKey>, _batch_amount: u8) -> Vec<msgs::NodeAnnouncement> { Vec::new() }
72 fn peer_connected(&self, _their_node_id: &PublicKey, _init: &msgs::Init) {}
73 fn handle_reply_channel_range(&self, _their_node_id: &PublicKey, _msg: msgs::ReplyChannelRange) -> Result<(), LightningError> { Ok(()) }
74 fn handle_reply_short_channel_ids_end(&self, _their_node_id: &PublicKey, _msg: msgs::ReplyShortChannelIdsEnd) -> Result<(), LightningError> { Ok(()) }
75 fn handle_query_channel_range(&self, _their_node_id: &PublicKey, _msg: msgs::QueryChannelRange) -> Result<(), LightningError> { Ok(()) }
76 fn handle_query_short_channel_ids(&self, _their_node_id: &PublicKey, _msg: msgs::QueryShortChannelIds) -> Result<(), LightningError> { Ok(()) }
78 impl Deref for IgnoringMessageHandler {
79 type Target = IgnoringMessageHandler;
80 fn deref(&self) -> &Self { self }
83 // Implement Type for Infallible, note that it cannot be constructed, and thus you can never call a
84 // method that takes self for it.
85 impl wire::Type for Infallible {
86 fn type_id(&self) -> u16 {
90 impl Writeable for Infallible {
91 fn write<W: Writer>(&self, _: &mut W) -> Result<(), io::Error> {
96 impl wire::CustomMessageReader for IgnoringMessageHandler {
97 type CustomMessage = Infallible;
98 fn read<R: io::Read>(&self, _message_type: u16, _buffer: &mut R) -> Result<Option<Self::CustomMessage>, msgs::DecodeError> {
103 impl CustomMessageHandler for IgnoringMessageHandler {
104 fn handle_custom_message(&self, _msg: Infallible, _sender_node_id: &PublicKey) -> Result<(), LightningError> {
105 // Since we always return `None` in the read the handle method should never be called.
109 fn get_and_clear_pending_msg(&self) -> Vec<(PublicKey, Self::CustomMessage)> { Vec::new() }
112 /// A dummy struct which implements `ChannelMessageHandler` without having any channels.
113 /// You can provide one of these as the route_handler in a MessageHandler.
114 pub struct ErroringMessageHandler {
115 message_queue: Mutex<Vec<MessageSendEvent>>
117 impl ErroringMessageHandler {
118 /// Constructs a new ErroringMessageHandler
119 pub fn new() -> Self {
120 Self { message_queue: Mutex::new(Vec::new()) }
122 fn push_error(&self, node_id: &PublicKey, channel_id: [u8; 32]) {
123 self.message_queue.lock().unwrap().push(MessageSendEvent::HandleError {
124 action: msgs::ErrorAction::SendErrorMessage {
125 msg: msgs::ErrorMessage { channel_id, data: "We do not support channel messages, sorry.".to_owned() },
127 node_id: node_id.clone(),
131 impl MessageSendEventsProvider for ErroringMessageHandler {
132 fn get_and_clear_pending_msg_events(&self) -> Vec<MessageSendEvent> {
133 let mut res = Vec::new();
134 mem::swap(&mut res, &mut self.message_queue.lock().unwrap());
138 impl ChannelMessageHandler for ErroringMessageHandler {
139 // Any messages which are related to a specific channel generate an error message to let the
140 // peer know we don't care about channels.
141 fn handle_open_channel(&self, their_node_id: &PublicKey, _their_features: InitFeatures, msg: &msgs::OpenChannel) {
142 ErroringMessageHandler::push_error(self, their_node_id, msg.temporary_channel_id);
144 fn handle_accept_channel(&self, their_node_id: &PublicKey, _their_features: InitFeatures, msg: &msgs::AcceptChannel) {
145 ErroringMessageHandler::push_error(self, their_node_id, msg.temporary_channel_id);
147 fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) {
148 ErroringMessageHandler::push_error(self, their_node_id, msg.temporary_channel_id);
150 fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) {
151 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
153 fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &msgs::FundingLocked) {
154 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
156 fn handle_shutdown(&self, their_node_id: &PublicKey, _their_features: &InitFeatures, msg: &msgs::Shutdown) {
157 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
159 fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &msgs::ClosingSigned) {
160 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
162 fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) {
163 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
165 fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) {
166 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
168 fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) {
169 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
171 fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) {
172 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
174 fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) {
175 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
177 fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) {
178 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
180 fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) {
181 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
183 fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) {
184 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
186 fn handle_channel_reestablish(&self, their_node_id: &PublicKey, msg: &msgs::ChannelReestablish) {
187 ErroringMessageHandler::push_error(self, their_node_id, msg.channel_id);
189 // msgs::ChannelUpdate does not contain the channel_id field, so we just drop them.
190 fn handle_channel_update(&self, _their_node_id: &PublicKey, _msg: &msgs::ChannelUpdate) {}
191 fn peer_disconnected(&self, _their_node_id: &PublicKey, _no_connection_possible: bool) {}
192 fn peer_connected(&self, _their_node_id: &PublicKey, _msg: &msgs::Init) {}
193 fn handle_error(&self, _their_node_id: &PublicKey, _msg: &msgs::ErrorMessage) {}
195 impl Deref for ErroringMessageHandler {
196 type Target = ErroringMessageHandler;
197 fn deref(&self) -> &Self { self }
200 /// Provides references to trait impls which handle different types of messages.
201 pub struct MessageHandler<CM: Deref, RM: Deref> where
202 CM::Target: ChannelMessageHandler,
203 RM::Target: RoutingMessageHandler {
204 /// A message handler which handles messages specific to channels. Usually this is just a
205 /// [`ChannelManager`] object or an [`ErroringMessageHandler`].
207 /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
208 pub chan_handler: CM,
209 /// A message handler which handles messages updating our knowledge of the network channel
210 /// graph. Usually this is just a [`NetGraphMsgHandler`] object or an
211 /// [`IgnoringMessageHandler`].
213 /// [`NetGraphMsgHandler`]: crate::routing::network_graph::NetGraphMsgHandler
214 pub route_handler: RM,
217 /// Provides an object which can be used to send data to and which uniquely identifies a connection
218 /// to a remote host. You will need to be able to generate multiple of these which meet Eq and
219 /// implement Hash to meet the PeerManager API.
221 /// For efficiency, Clone should be relatively cheap for this type.
223 /// Two descriptors may compare equal (by [`cmp::Eq`] and [`hash::Hash`]) as long as the original
224 /// has been disconnected, the [`PeerManager`] has been informed of the disconnection (either by it
225 /// having triggered the disconnection or a call to [`PeerManager::socket_disconnected`]), and no
226 /// further calls to the [`PeerManager`] related to the original socket occur. This allows you to
227 /// use a file descriptor for your SocketDescriptor directly, however for simplicity you may wish
228 /// to simply use another value which is guaranteed to be globally unique instead.
229 pub trait SocketDescriptor : cmp::Eq + hash::Hash + Clone {
230 /// Attempts to send some data from the given slice to the peer.
232 /// Returns the amount of data which was sent, possibly 0 if the socket has since disconnected.
233 /// Note that in the disconnected case, [`PeerManager::socket_disconnected`] must still be
234 /// called and further write attempts may occur until that time.
236 /// If the returned size is smaller than `data.len()`, a
237 /// [`PeerManager::write_buffer_space_avail`] call must be made the next time more data can be
238 /// written. Additionally, until a `send_data` event completes fully, no further
239 /// [`PeerManager::read_event`] calls should be made for the same peer! Because this is to
240 /// prevent denial-of-service issues, you should not read or buffer any data from the socket
243 /// If a [`PeerManager::read_event`] call on this descriptor had previously returned true
244 /// (indicating that read events should be paused to prevent DoS in the send buffer),
245 /// `resume_read` may be set indicating that read events on this descriptor should resume. A
246 /// `resume_read` of false carries no meaning, and should not cause any action.
247 fn send_data(&mut self, data: &[u8], resume_read: bool) -> usize;
248 /// Disconnect the socket pointed to by this SocketDescriptor.
250 /// You do *not* need to call [`PeerManager::socket_disconnected`] with this socket after this
251 /// call (doing so is a noop).
252 fn disconnect_socket(&mut self);
255 /// Error for PeerManager errors. If you get one of these, you must disconnect the socket and
256 /// generate no further read_event/write_buffer_space_avail/socket_disconnected calls for the
259 pub struct PeerHandleError {
260 /// Used to indicate that we probably can't make any future connections to this peer, implying
261 /// we should go ahead and force-close any channels we have with it.
262 pub no_connection_possible: bool,
264 impl fmt::Debug for PeerHandleError {
265 fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
266 formatter.write_str("Peer Sent Invalid Data")
269 impl fmt::Display for PeerHandleError {
270 fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
271 formatter.write_str("Peer Sent Invalid Data")
275 #[cfg(feature = "std")]
276 impl error::Error for PeerHandleError {
277 fn description(&self) -> &str {
278 "Peer Sent Invalid Data"
282 enum InitSyncTracker{
284 ChannelsSyncing(u64),
285 NodesSyncing(PublicKey),
288 /// The ratio between buffer sizes at which we stop sending initial sync messages vs when we stop
289 /// forwarding gossip messages to peers altogether.
290 const FORWARD_INIT_SYNC_BUFFER_LIMIT_RATIO: usize = 2;
292 /// When the outbound buffer has this many messages, we'll stop reading bytes from the peer until
293 /// we have fewer than this many messages in the outbound buffer again.
294 /// We also use this as the target number of outbound gossip messages to keep in the write buffer,
295 /// refilled as we send bytes.
296 const OUTBOUND_BUFFER_LIMIT_READ_PAUSE: usize = 10;
297 /// When the outbound buffer has this many messages, we'll simply skip relaying gossip messages to
299 const OUTBOUND_BUFFER_LIMIT_DROP_GOSSIP: usize = OUTBOUND_BUFFER_LIMIT_READ_PAUSE * FORWARD_INIT_SYNC_BUFFER_LIMIT_RATIO;
301 /// If we've sent a ping, and are still awaiting a response, we may need to churn our way through
302 /// the socket receive buffer before receiving the ping.
304 /// On a fairly old Arm64 board, with Linux defaults, this can take as long as 20 seconds, not
305 /// including any network delays, outbound traffic, or the same for messages from other peers.
307 /// Thus, to avoid needlessly disconnecting a peer, we allow a peer to take this many timer ticks
308 /// per connected peer to respond to a ping, as long as they send us at least one message during
309 /// each tick, ensuring we aren't actually just disconnected.
310 /// With a timer tick interval of ten seconds, this translates to about 40 seconds per connected
313 /// When we improve parallelism somewhat we should reduce this to e.g. this many timer ticks per
314 /// two connected peers, assuming most LDK-running systems have at least two cores.
315 const MAX_BUFFER_DRAIN_TICK_INTERVALS_PER_PEER: i8 = 4;
317 /// This is the minimum number of messages we expect a peer to be able to handle within one timer
318 /// tick. Once we have sent this many messages since the last ping, we send a ping right away to
319 /// ensures we don't just fill up our send buffer and leave the peer with too many messages to
320 /// process before the next ping.
321 const BUFFER_DRAIN_MSGS_PER_TICK: usize = 32;
324 channel_encryptor: PeerChannelEncryptor,
325 their_node_id: Option<PublicKey>,
326 their_features: Option<InitFeatures>,
327 their_net_address: Option<NetAddress>,
329 pending_outbound_buffer: LinkedList<Vec<u8>>,
330 pending_outbound_buffer_first_msg_offset: usize,
331 awaiting_write_event: bool,
333 pending_read_buffer: Vec<u8>,
334 pending_read_buffer_pos: usize,
335 pending_read_is_header: bool,
337 sync_status: InitSyncTracker,
339 msgs_sent_since_pong: usize,
340 awaiting_pong_timer_tick_intervals: i8,
341 received_message_since_timer_tick: bool,
342 sent_gossip_timestamp_filter: bool,
346 /// Returns true if the channel announcements/updates for the given channel should be
347 /// forwarded to this peer.
348 /// If we are sending our routing table to this peer and we have not yet sent channel
349 /// announcements/updates for the given channel_id then we will send it when we get to that
350 /// point and we shouldn't send it yet to avoid sending duplicate updates. If we've already
351 /// sent the old versions, we should send the update, and so return true here.
352 fn should_forward_channel_announcement(&self, channel_id: u64) -> bool {
353 if self.their_features.as_ref().unwrap().supports_gossip_queries() &&
354 !self.sent_gossip_timestamp_filter {
357 match self.sync_status {
358 InitSyncTracker::NoSyncRequested => true,
359 InitSyncTracker::ChannelsSyncing(i) => i < channel_id,
360 InitSyncTracker::NodesSyncing(_) => true,
364 /// Similar to the above, but for node announcements indexed by node_id.
365 fn should_forward_node_announcement(&self, node_id: PublicKey) -> bool {
366 if self.their_features.as_ref().unwrap().supports_gossip_queries() &&
367 !self.sent_gossip_timestamp_filter {
370 match self.sync_status {
371 InitSyncTracker::NoSyncRequested => true,
372 InitSyncTracker::ChannelsSyncing(_) => false,
373 InitSyncTracker::NodesSyncing(pk) => pk < node_id,
378 struct PeerHolder<Descriptor: SocketDescriptor> {
379 peers: HashMap<Descriptor, Peer>,
380 /// Only add to this set when noise completes:
381 node_id_to_descriptor: HashMap<PublicKey, Descriptor>,
384 /// SimpleArcPeerManager is useful when you need a PeerManager with a static lifetime, e.g.
385 /// when you're using lightning-net-tokio (since tokio::spawn requires parameters with static
386 /// lifetimes). Other times you can afford a reference, which is more efficient, in which case
387 /// SimpleRefPeerManager is the more appropriate type. Defining these type aliases prevents
388 /// issues such as overly long function definitions.
390 /// (C-not exported) as Arcs don't make sense in bindings
391 pub type SimpleArcPeerManager<SD, M, T, F, C, L> = PeerManager<SD, Arc<SimpleArcChannelManager<M, T, F, L>>, Arc<NetGraphMsgHandler<Arc<NetworkGraph>, Arc<C>, Arc<L>>>, Arc<L>, Arc<IgnoringMessageHandler>>;
393 /// SimpleRefPeerManager is a type alias for a PeerManager reference, and is the reference
394 /// counterpart to the SimpleArcPeerManager type alias. Use this type by default when you don't
395 /// need a PeerManager with a static lifetime. You'll need a static lifetime in cases such as
396 /// usage of lightning-net-tokio (since tokio::spawn requires parameters with static lifetimes).
397 /// But if this is not necessary, using a reference is more efficient. Defining these type aliases
398 /// helps with issues such as long function definitions.
400 /// (C-not exported) as Arcs don't make sense in bindings
401 pub type SimpleRefPeerManager<'a, 'b, 'c, 'd, 'e, 'f, 'g, 'h, SD, M, T, F, C, L> = PeerManager<SD, SimpleRefChannelManager<'a, 'b, 'c, 'd, 'e, M, T, F, L>, &'e NetGraphMsgHandler<&'g NetworkGraph, &'h C, &'f L>, &'f L, IgnoringMessageHandler>;
403 /// A PeerManager manages a set of peers, described by their [`SocketDescriptor`] and marshalls
404 /// socket events into messages which it passes on to its [`MessageHandler`].
406 /// Locks are taken internally, so you must never assume that reentrancy from a
407 /// [`SocketDescriptor`] call back into [`PeerManager`] methods will not deadlock.
409 /// Calls to [`read_event`] will decode relevant messages and pass them to the
410 /// [`ChannelMessageHandler`], likely doing message processing in-line. Thus, the primary form of
411 /// parallelism in Rust-Lightning is in calls to [`read_event`]. Note, however, that calls to any
412 /// [`PeerManager`] functions related to the same connection must occur only in serial, making new
413 /// calls only after previous ones have returned.
415 /// Rather than using a plain PeerManager, it is preferable to use either a SimpleArcPeerManager
416 /// a SimpleRefPeerManager, for conciseness. See their documentation for more details, but
417 /// essentially you should default to using a SimpleRefPeerManager, and use a
418 /// SimpleArcPeerManager when you require a PeerManager with a static lifetime, such as when
419 /// you're using lightning-net-tokio.
421 /// [`read_event`]: PeerManager::read_event
422 pub struct PeerManager<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, L: Deref, CMH: Deref> where
423 CM::Target: ChannelMessageHandler,
424 RM::Target: RoutingMessageHandler,
426 CMH::Target: CustomMessageHandler {
427 message_handler: MessageHandler<CM, RM>,
428 peers: Mutex<PeerHolder<Descriptor>>,
429 our_node_secret: SecretKey,
430 ephemeral_key_midstate: Sha256Engine,
431 custom_message_handler: CMH,
433 peer_counter: AtomicCounter,
438 enum MessageHandlingError {
439 PeerHandleError(PeerHandleError),
440 LightningError(LightningError),
443 impl From<PeerHandleError> for MessageHandlingError {
444 fn from(error: PeerHandleError) -> Self {
445 MessageHandlingError::PeerHandleError(error)
449 impl From<LightningError> for MessageHandlingError {
450 fn from(error: LightningError) -> Self {
451 MessageHandlingError::LightningError(error)
455 macro_rules! encode_msg {
457 let mut buffer = VecWriter(Vec::new());
458 wire::write($msg, &mut buffer).unwrap();
463 impl<Descriptor: SocketDescriptor, CM: Deref, L: Deref> PeerManager<Descriptor, CM, IgnoringMessageHandler, L, IgnoringMessageHandler> where
464 CM::Target: ChannelMessageHandler,
466 /// Constructs a new PeerManager with the given ChannelMessageHandler. No routing message
467 /// handler is used and network graph messages are ignored.
469 /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
470 /// cryptographically secure random bytes.
472 /// (C-not exported) as we can't export a PeerManager with a dummy route handler
473 pub fn new_channel_only(channel_message_handler: CM, our_node_secret: SecretKey, ephemeral_random_data: &[u8; 32], logger: L) -> Self {
474 Self::new(MessageHandler {
475 chan_handler: channel_message_handler,
476 route_handler: IgnoringMessageHandler{},
477 }, our_node_secret, ephemeral_random_data, logger, IgnoringMessageHandler{})
481 impl<Descriptor: SocketDescriptor, RM: Deref, L: Deref> PeerManager<Descriptor, ErroringMessageHandler, RM, L, IgnoringMessageHandler> where
482 RM::Target: RoutingMessageHandler,
484 /// Constructs a new PeerManager with the given RoutingMessageHandler. No channel message
485 /// handler is used and messages related to channels will be ignored (or generate error
486 /// messages). Note that some other lightning implementations time-out connections after some
487 /// time if no channel is built with the peer.
489 /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
490 /// cryptographically secure random bytes.
492 /// (C-not exported) as we can't export a PeerManager with a dummy channel handler
493 pub fn new_routing_only(routing_message_handler: RM, our_node_secret: SecretKey, ephemeral_random_data: &[u8; 32], logger: L) -> Self {
494 Self::new(MessageHandler {
495 chan_handler: ErroringMessageHandler::new(),
496 route_handler: routing_message_handler,
497 }, our_node_secret, ephemeral_random_data, logger, IgnoringMessageHandler{})
501 /// A simple wrapper that optionally prints " from <pubkey>" for an optional pubkey.
502 /// This works around `format!()` taking a reference to each argument, preventing
503 /// `if let Some(node_id) = peer.their_node_id { format!(.., node_id) } else { .. }` from compiling
504 /// due to lifetime errors.
505 struct OptionalFromDebugger<'a>(&'a Option<PublicKey>);
506 impl core::fmt::Display for OptionalFromDebugger<'_> {
507 fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> Result<(), core::fmt::Error> {
508 if let Some(node_id) = self.0 { write!(f, " from {}", log_pubkey!(node_id)) } else { Ok(()) }
512 /// A function used to filter out local or private addresses
513 /// https://www.iana.org./assignments/ipv4-address-space/ipv4-address-space.xhtml
514 /// https://www.iana.org/assignments/ipv6-address-space/ipv6-address-space.xhtml
515 fn filter_addresses(ip_address: Option<NetAddress>) -> Option<NetAddress> {
517 // For IPv4 range 10.0.0.0 - 10.255.255.255 (10/8)
518 Some(NetAddress::IPv4{addr: [10, _, _, _], port: _}) => None,
519 // For IPv4 range 0.0.0.0 - 0.255.255.255 (0/8)
520 Some(NetAddress::IPv4{addr: [0, _, _, _], port: _}) => None,
521 // For IPv4 range 100.64.0.0 - 100.127.255.255 (100.64/10)
522 Some(NetAddress::IPv4{addr: [100, 64..=127, _, _], port: _}) => None,
523 // For IPv4 range 127.0.0.0 - 127.255.255.255 (127/8)
524 Some(NetAddress::IPv4{addr: [127, _, _, _], port: _}) => None,
525 // For IPv4 range 169.254.0.0 - 169.254.255.255 (169.254/16)
526 Some(NetAddress::IPv4{addr: [169, 254, _, _], port: _}) => None,
527 // For IPv4 range 172.16.0.0 - 172.31.255.255 (172.16/12)
528 Some(NetAddress::IPv4{addr: [172, 16..=31, _, _], port: _}) => None,
529 // For IPv4 range 192.168.0.0 - 192.168.255.255 (192.168/16)
530 Some(NetAddress::IPv4{addr: [192, 168, _, _], port: _}) => None,
531 // For IPv4 range 192.88.99.0 - 192.88.99.255 (192.88.99/24)
532 Some(NetAddress::IPv4{addr: [192, 88, 99, _], port: _}) => None,
533 // For IPv6 range 2000:0000:0000:0000:0000:0000:0000:0000 - 3fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff (2000::/3)
534 Some(NetAddress::IPv6{addr: [0x20..=0x3F, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _], port: _}) => ip_address,
535 // For remaining addresses
536 Some(NetAddress::IPv6{addr: _, port: _}) => None,
537 Some(..) => ip_address,
542 impl<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, L: Deref, CMH: Deref> PeerManager<Descriptor, CM, RM, L, CMH> where
543 CM::Target: ChannelMessageHandler,
544 RM::Target: RoutingMessageHandler,
546 CMH::Target: CustomMessageHandler {
547 /// Constructs a new PeerManager with the given message handlers and node_id secret key
548 /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
549 /// cryptographically secure random bytes.
550 pub fn new(message_handler: MessageHandler<CM, RM>, our_node_secret: SecretKey, ephemeral_random_data: &[u8; 32], logger: L, custom_message_handler: CMH) -> Self {
551 let mut ephemeral_key_midstate = Sha256::engine();
552 ephemeral_key_midstate.input(ephemeral_random_data);
556 peers: Mutex::new(PeerHolder {
557 peers: HashMap::new(),
558 node_id_to_descriptor: HashMap::new()
561 ephemeral_key_midstate,
562 peer_counter: AtomicCounter::new(),
564 custom_message_handler,
568 /// Get the list of node ids for peers which have completed the initial handshake.
570 /// For outbound connections, this will be the same as the their_node_id parameter passed in to
571 /// new_outbound_connection, however entries will only appear once the initial handshake has
572 /// completed and we are sure the remote peer has the private key for the given node_id.
573 pub fn get_peer_node_ids(&self) -> Vec<PublicKey> {
574 let peers = self.peers.lock().unwrap();
575 peers.peers.values().filter_map(|p| {
576 if !p.channel_encryptor.is_ready_for_encryption() || p.their_features.is_none() {
583 fn get_ephemeral_key(&self) -> SecretKey {
584 let mut ephemeral_hash = self.ephemeral_key_midstate.clone();
585 let counter = self.peer_counter.get_increment();
586 ephemeral_hash.input(&counter.to_le_bytes());
587 SecretKey::from_slice(&Sha256::from_engine(ephemeral_hash).into_inner()).expect("You broke SHA-256!")
590 /// Indicates a new outbound connection has been established to a node with the given node_id
591 /// and an optional remote network address.
593 /// The remote network address adds the option to report a remote IP address back to a connecting
594 /// peer using the init message.
595 /// The user should pass the remote network address of the host they are connected to.
597 /// Note that if an Err is returned here you MUST NOT call socket_disconnected for the new
598 /// descriptor but must disconnect the connection immediately.
600 /// Returns a small number of bytes to send to the remote node (currently always 50).
602 /// Panics if descriptor is duplicative with some other descriptor which has not yet been
603 /// [`socket_disconnected()`].
605 /// [`socket_disconnected()`]: PeerManager::socket_disconnected
606 pub fn new_outbound_connection(&self, their_node_id: PublicKey, descriptor: Descriptor, remote_network_address: Option<NetAddress>) -> Result<Vec<u8>, PeerHandleError> {
607 let mut peer_encryptor = PeerChannelEncryptor::new_outbound(their_node_id.clone(), self.get_ephemeral_key());
608 let res = peer_encryptor.get_act_one().to_vec();
609 let pending_read_buffer = [0; 50].to_vec(); // Noise act two is 50 bytes
611 let mut peers = self.peers.lock().unwrap();
612 if peers.peers.insert(descriptor, Peer {
613 channel_encryptor: peer_encryptor,
615 their_features: None,
616 their_net_address: remote_network_address,
618 pending_outbound_buffer: LinkedList::new(),
619 pending_outbound_buffer_first_msg_offset: 0,
620 awaiting_write_event: false,
623 pending_read_buffer_pos: 0,
624 pending_read_is_header: false,
626 sync_status: InitSyncTracker::NoSyncRequested,
628 msgs_sent_since_pong: 0,
629 awaiting_pong_timer_tick_intervals: 0,
630 received_message_since_timer_tick: false,
631 sent_gossip_timestamp_filter: false,
633 panic!("PeerManager driver duplicated descriptors!");
638 /// Indicates a new inbound connection has been established to a node with an optional remote
641 /// The remote network address adds the option to report a remote IP address back to a connecting
642 /// peer using the init message.
643 /// The user should pass the remote network address of the host they are connected to.
645 /// May refuse the connection by returning an Err, but will never write bytes to the remote end
646 /// (outbound connector always speaks first). Note that if an Err is returned here you MUST NOT
647 /// call socket_disconnected for the new descriptor but must disconnect the connection
650 /// Panics if descriptor is duplicative with some other descriptor which has not yet been
651 /// [`socket_disconnected()`].
653 /// [`socket_disconnected()`]: PeerManager::socket_disconnected
654 pub fn new_inbound_connection(&self, descriptor: Descriptor, remote_network_address: Option<NetAddress>) -> Result<(), PeerHandleError> {
655 let peer_encryptor = PeerChannelEncryptor::new_inbound(&self.our_node_secret);
656 let pending_read_buffer = [0; 50].to_vec(); // Noise act one is 50 bytes
658 let mut peers = self.peers.lock().unwrap();
659 if peers.peers.insert(descriptor, Peer {
660 channel_encryptor: peer_encryptor,
662 their_features: None,
663 their_net_address: remote_network_address,
665 pending_outbound_buffer: LinkedList::new(),
666 pending_outbound_buffer_first_msg_offset: 0,
667 awaiting_write_event: false,
670 pending_read_buffer_pos: 0,
671 pending_read_is_header: false,
673 sync_status: InitSyncTracker::NoSyncRequested,
675 msgs_sent_since_pong: 0,
676 awaiting_pong_timer_tick_intervals: 0,
677 received_message_since_timer_tick: false,
678 sent_gossip_timestamp_filter: false,
680 panic!("PeerManager driver duplicated descriptors!");
685 fn do_attempt_write_data(&self, descriptor: &mut Descriptor, peer: &mut Peer) {
686 while !peer.awaiting_write_event {
687 if peer.pending_outbound_buffer.len() < OUTBOUND_BUFFER_LIMIT_READ_PAUSE && peer.msgs_sent_since_pong < BUFFER_DRAIN_MSGS_PER_TICK {
688 match peer.sync_status {
689 InitSyncTracker::NoSyncRequested => {},
690 InitSyncTracker::ChannelsSyncing(c) if c < 0xffff_ffff_ffff_ffff => {
691 let steps = ((OUTBOUND_BUFFER_LIMIT_READ_PAUSE - peer.pending_outbound_buffer.len() + 2) / 3) as u8;
692 let all_messages = self.message_handler.route_handler.get_next_channel_announcements(c, steps);
693 for &(ref announce, ref update_a_option, ref update_b_option) in all_messages.iter() {
694 self.enqueue_message(peer, announce);
695 if let &Some(ref update_a) = update_a_option {
696 self.enqueue_message(peer, update_a);
698 if let &Some(ref update_b) = update_b_option {
699 self.enqueue_message(peer, update_b);
701 peer.sync_status = InitSyncTracker::ChannelsSyncing(announce.contents.short_channel_id + 1);
703 if all_messages.is_empty() || all_messages.len() != steps as usize {
704 peer.sync_status = InitSyncTracker::ChannelsSyncing(0xffff_ffff_ffff_ffff);
707 InitSyncTracker::ChannelsSyncing(c) if c == 0xffff_ffff_ffff_ffff => {
708 let steps = (OUTBOUND_BUFFER_LIMIT_READ_PAUSE - peer.pending_outbound_buffer.len()) as u8;
709 let all_messages = self.message_handler.route_handler.get_next_node_announcements(None, steps);
710 for msg in all_messages.iter() {
711 self.enqueue_message(peer, msg);
712 peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
714 if all_messages.is_empty() || all_messages.len() != steps as usize {
715 peer.sync_status = InitSyncTracker::NoSyncRequested;
718 InitSyncTracker::ChannelsSyncing(_) => unreachable!(),
719 InitSyncTracker::NodesSyncing(key) => {
720 let steps = (OUTBOUND_BUFFER_LIMIT_READ_PAUSE - peer.pending_outbound_buffer.len()) as u8;
721 let all_messages = self.message_handler.route_handler.get_next_node_announcements(Some(&key), steps);
722 for msg in all_messages.iter() {
723 self.enqueue_message(peer, msg);
724 peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
726 if all_messages.is_empty() || all_messages.len() != steps as usize {
727 peer.sync_status = InitSyncTracker::NoSyncRequested;
732 if peer.msgs_sent_since_pong >= BUFFER_DRAIN_MSGS_PER_TICK {
733 self.maybe_send_extra_ping(peer);
737 let next_buff = match peer.pending_outbound_buffer.front() {
742 let should_be_reading = peer.pending_outbound_buffer.len() < OUTBOUND_BUFFER_LIMIT_READ_PAUSE;
743 let pending = &next_buff[peer.pending_outbound_buffer_first_msg_offset..];
744 let data_sent = descriptor.send_data(pending, should_be_reading);
745 peer.pending_outbound_buffer_first_msg_offset += data_sent;
746 if peer.pending_outbound_buffer_first_msg_offset == next_buff.len() { true } else { false }
748 peer.pending_outbound_buffer_first_msg_offset = 0;
749 peer.pending_outbound_buffer.pop_front();
751 peer.awaiting_write_event = true;
756 /// Indicates that there is room to write data to the given socket descriptor.
758 /// May return an Err to indicate that the connection should be closed.
760 /// May call [`send_data`] on the descriptor passed in (or an equal descriptor) before
761 /// returning. Thus, be very careful with reentrancy issues! The invariants around calling
762 /// [`write_buffer_space_avail`] in case a write did not fully complete must still hold - be
763 /// ready to call `[write_buffer_space_avail`] again if a write call generated here isn't
766 /// [`send_data`]: SocketDescriptor::send_data
767 /// [`write_buffer_space_avail`]: PeerManager::write_buffer_space_avail
768 pub fn write_buffer_space_avail(&self, descriptor: &mut Descriptor) -> Result<(), PeerHandleError> {
769 let mut peers = self.peers.lock().unwrap();
770 match peers.peers.get_mut(descriptor) {
772 // This is most likely a simple race condition where the user found that the socket
773 // was writeable, then we told the user to `disconnect_socket()`, then they called
774 // this method. Return an error to make sure we get disconnected.
775 return Err(PeerHandleError { no_connection_possible: false });
778 peer.awaiting_write_event = false;
779 self.do_attempt_write_data(descriptor, peer);
785 /// Indicates that data was read from the given socket descriptor.
787 /// May return an Err to indicate that the connection should be closed.
789 /// Will *not* call back into [`send_data`] on any descriptors to avoid reentrancy complexity.
790 /// Thus, however, you should call [`process_events`] after any `read_event` to generate
791 /// [`send_data`] calls to handle responses.
793 /// If `Ok(true)` is returned, further read_events should not be triggered until a
794 /// [`send_data`] call on this descriptor has `resume_read` set (preventing DoS issues in the
797 /// [`send_data`]: SocketDescriptor::send_data
798 /// [`process_events`]: PeerManager::process_events
799 pub fn read_event(&self, peer_descriptor: &mut Descriptor, data: &[u8]) -> Result<bool, PeerHandleError> {
800 match self.do_read_event(peer_descriptor, data) {
803 log_trace!(self.logger, "Peer sent invalid data or we decided to disconnect due to a protocol error");
804 self.disconnect_event_internal(peer_descriptor, e.no_connection_possible);
810 /// Append a message to a peer's pending outbound/write buffer
811 fn enqueue_encoded_message(&self, peer: &mut Peer, encoded_message: &Vec<u8>) {
812 peer.msgs_sent_since_pong += 1;
813 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_message[..]));
816 /// Append a message to a peer's pending outbound/write buffer
817 fn enqueue_message<M: wire::Type>(&self, peer: &mut Peer, message: &M) {
818 let mut buffer = VecWriter(Vec::with_capacity(2048));
819 wire::write(message, &mut buffer).unwrap(); // crash if the write failed
821 if is_gossip_msg(message.type_id()) {
822 log_gossip!(self.logger, "Enqueueing message {:?} to {}", message, log_pubkey!(peer.their_node_id.unwrap()));
824 log_trace!(self.logger, "Enqueueing message {:?} to {}", message, log_pubkey!(peer.their_node_id.unwrap()))
826 self.enqueue_encoded_message(peer, &buffer.0);
829 fn do_read_event(&self, peer_descriptor: &mut Descriptor, data: &[u8]) -> Result<bool, PeerHandleError> {
831 let mut peers_lock = self.peers.lock().unwrap();
832 let peers = &mut *peers_lock;
833 let mut msgs_to_forward = Vec::new();
834 let mut peer_node_id = None;
835 let pause_read = match peers.peers.get_mut(peer_descriptor) {
837 // This is most likely a simple race condition where the user read some bytes
838 // from the socket, then we told the user to `disconnect_socket()`, then they
839 // called this method. Return an error to make sure we get disconnected.
840 return Err(PeerHandleError { no_connection_possible: false });
843 assert!(peer.pending_read_buffer.len() > 0);
844 assert!(peer.pending_read_buffer.len() > peer.pending_read_buffer_pos);
846 let mut read_pos = 0;
847 while read_pos < data.len() {
849 let data_to_copy = cmp::min(peer.pending_read_buffer.len() - peer.pending_read_buffer_pos, data.len() - read_pos);
850 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]);
851 read_pos += data_to_copy;
852 peer.pending_read_buffer_pos += data_to_copy;
855 if peer.pending_read_buffer_pos == peer.pending_read_buffer.len() {
856 peer.pending_read_buffer_pos = 0;
858 macro_rules! try_potential_handleerror {
864 msgs::ErrorAction::DisconnectPeer { msg: _ } => {
865 //TODO: Try to push msg
866 log_debug!(self.logger, "Error handling message{}; disconnecting peer with: {}", OptionalFromDebugger(&peer.their_node_id), e.err);
867 return Err(PeerHandleError{ no_connection_possible: false });
869 msgs::ErrorAction::IgnoreAndLog(level) => {
870 log_given_level!(self.logger, level, "Error handling message{}; ignoring: {}", OptionalFromDebugger(&peer.their_node_id), e.err);
873 msgs::ErrorAction::IgnoreDuplicateGossip => continue, // Don't even bother logging these
874 msgs::ErrorAction::IgnoreError => {
875 log_debug!(self.logger, "Error handling message{}; ignoring: {}", OptionalFromDebugger(&peer.their_node_id), e.err);
878 msgs::ErrorAction::SendErrorMessage { msg } => {
879 log_debug!(self.logger, "Error handling message{}; sending error message with: {}", OptionalFromDebugger(&peer.their_node_id), e.err);
880 self.enqueue_message(peer, &msg);
883 msgs::ErrorAction::SendWarningMessage { msg, log_level } => {
884 log_given_level!(self.logger, log_level, "Error handling message{}; sending warning message with: {}", OptionalFromDebugger(&peer.their_node_id), e.err);
885 self.enqueue_message(peer, &msg);
894 macro_rules! insert_node_id {
896 match peers.node_id_to_descriptor.entry(peer.their_node_id.unwrap()) {
897 hash_map::Entry::Occupied(_) => {
898 log_trace!(self.logger, "Got second connection with {}, closing", log_pubkey!(peer.their_node_id.unwrap()));
899 peer.their_node_id = None; // Unset so that we don't generate a peer_disconnected event
900 return Err(PeerHandleError{ no_connection_possible: false })
902 hash_map::Entry::Vacant(entry) => {
903 log_debug!(self.logger, "Finished noise handshake for connection with {}", log_pubkey!(peer.their_node_id.unwrap()));
904 entry.insert(peer_descriptor.clone())
910 let next_step = peer.channel_encryptor.get_noise_step();
912 NextNoiseStep::ActOne => {
913 let act_two = try_potential_handleerror!(peer.channel_encryptor.process_act_one_with_keys(&peer.pending_read_buffer[..], &self.our_node_secret, self.get_ephemeral_key())).to_vec();
914 peer.pending_outbound_buffer.push_back(act_two);
915 peer.pending_read_buffer = [0; 66].to_vec(); // act three is 66 bytes long
917 NextNoiseStep::ActTwo => {
918 let (act_three, their_node_id) = try_potential_handleerror!(peer.channel_encryptor.process_act_two(&peer.pending_read_buffer[..], &self.our_node_secret));
919 peer.pending_outbound_buffer.push_back(act_three.to_vec());
920 peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
921 peer.pending_read_is_header = true;
923 peer.their_node_id = Some(their_node_id);
925 let features = InitFeatures::known();
926 let resp = msgs::Init { features, remote_network_address: filter_addresses(peer.their_net_address.clone())};
927 self.enqueue_message(peer, &resp);
928 peer.awaiting_pong_timer_tick_intervals = 0;
930 NextNoiseStep::ActThree => {
931 let their_node_id = try_potential_handleerror!(peer.channel_encryptor.process_act_three(&peer.pending_read_buffer[..]));
932 peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
933 peer.pending_read_is_header = true;
934 peer.their_node_id = Some(their_node_id);
936 let features = InitFeatures::known();
937 let resp = msgs::Init { features, remote_network_address: filter_addresses(peer.their_net_address.clone())};
938 self.enqueue_message(peer, &resp);
939 peer.awaiting_pong_timer_tick_intervals = 0;
941 NextNoiseStep::NoiseComplete => {
942 if peer.pending_read_is_header {
943 let msg_len = try_potential_handleerror!(peer.channel_encryptor.decrypt_length_header(&peer.pending_read_buffer[..]));
944 peer.pending_read_buffer = Vec::with_capacity(msg_len as usize + 16);
945 peer.pending_read_buffer.resize(msg_len as usize + 16, 0);
946 if msg_len < 2 { // Need at least the message type tag
947 return Err(PeerHandleError{ no_connection_possible: false });
949 peer.pending_read_is_header = false;
951 let msg_data = try_potential_handleerror!(peer.channel_encryptor.decrypt_message(&peer.pending_read_buffer[..]));
952 assert!(msg_data.len() >= 2);
955 peer.pending_read_buffer = [0; 18].to_vec();
956 peer.pending_read_is_header = true;
958 let mut reader = io::Cursor::new(&msg_data[..]);
959 let message_result = wire::read(&mut reader, &*self.custom_message_handler);
960 let message = match message_result {
964 // Note that to avoid recursion we never call
965 // `do_attempt_write_data` from here, causing
966 // the messages enqueued here to not actually
967 // be sent before the peer is disconnected.
968 (msgs::DecodeError::UnknownRequiredFeature, Some(ty)) if is_gossip_msg(ty) => {
969 log_gossip!(self.logger, "Got a channel/node announcement with an unknown required feature flag, you may want to update!");
972 (msgs::DecodeError::UnsupportedCompression, _) => {
973 log_gossip!(self.logger, "We don't support zlib-compressed message fields, sending a warning and ignoring message");
974 self.enqueue_message(peer, &msgs::WarningMessage { channel_id: [0; 32], data: "Unsupported message compression: zlib".to_owned() });
977 (_, Some(ty)) if is_gossip_msg(ty) => {
978 log_gossip!(self.logger, "Got an invalid value while deserializing a gossip message");
979 self.enqueue_message(peer, &msgs::WarningMessage { channel_id: [0; 32], data: "Unreadable/bogus gossip message".to_owned() });
982 (msgs::DecodeError::UnknownRequiredFeature, ty) => {
983 log_gossip!(self.logger, "Received a message with an unknown required feature flag or TLV, you may want to update!");
984 self.enqueue_message(peer, &msgs::WarningMessage { channel_id: [0; 32], data: format!("Received an unknown required feature/TLV in message type {:?}", ty) });
985 return Err(PeerHandleError { no_connection_possible: false });
987 (msgs::DecodeError::UnknownVersion, _) => return Err(PeerHandleError { no_connection_possible: false }),
988 (msgs::DecodeError::InvalidValue, _) => {
989 log_debug!(self.logger, "Got an invalid value while deserializing message");
990 return Err(PeerHandleError { no_connection_possible: false });
992 (msgs::DecodeError::ShortRead, _) => {
993 log_debug!(self.logger, "Deserialization failed due to shortness of message");
994 return Err(PeerHandleError { no_connection_possible: false });
996 (msgs::DecodeError::BadLengthDescriptor, _) => return Err(PeerHandleError { no_connection_possible: false }),
997 (msgs::DecodeError::Io(_), _) => return Err(PeerHandleError { no_connection_possible: false }),
1002 match self.handle_message(peer, message) {
1003 Err(handling_error) => match handling_error {
1004 MessageHandlingError::PeerHandleError(e) => { return Err(e) },
1005 MessageHandlingError::LightningError(e) => {
1006 try_potential_handleerror!(Err(e));
1010 peer_node_id = Some(peer.their_node_id.expect("After noise is complete, their_node_id is always set"));
1011 msgs_to_forward.push(msg);
1021 peer.pending_outbound_buffer.len() > OUTBOUND_BUFFER_LIMIT_READ_PAUSE // pause_read
1025 for msg in msgs_to_forward.drain(..) {
1026 self.forward_broadcast_msg(peers, &msg, peer_node_id.as_ref());
1035 /// Process an incoming message and return a decision (ok, lightning error, peer handling error) regarding the next action with the peer
1036 /// Returns the message back if it needs to be broadcasted to all other peers.
1040 message: wire::Message<<<CMH as core::ops::Deref>::Target as wire::CustomMessageReader>::CustomMessage>
1041 ) -> Result<Option<wire::Message<<<CMH as core::ops::Deref>::Target as wire::CustomMessageReader>::CustomMessage>>, MessageHandlingError> {
1042 if is_gossip_msg(message.type_id()) {
1043 log_gossip!(self.logger, "Received message {:?} from {}", message, log_pubkey!(peer.their_node_id.unwrap()));
1045 log_trace!(self.logger, "Received message {:?} from {}", message, log_pubkey!(peer.their_node_id.unwrap()));
1048 peer.received_message_since_timer_tick = true;
1050 // Need an Init as first message
1051 if let wire::Message::Init(_) = message {
1052 } else if peer.their_features.is_none() {
1053 log_debug!(self.logger, "Peer {} sent non-Init first message", log_pubkey!(peer.their_node_id.unwrap()));
1054 return Err(PeerHandleError{ no_connection_possible: false }.into());
1057 let mut should_forward = None;
1060 // Setup and Control messages:
1061 wire::Message::Init(msg) => {
1062 if msg.features.requires_unknown_bits() {
1063 log_debug!(self.logger, "Peer features required unknown version bits");
1064 return Err(PeerHandleError{ no_connection_possible: true }.into());
1066 if peer.their_features.is_some() {
1067 return Err(PeerHandleError{ no_connection_possible: false }.into());
1070 log_info!(self.logger, "Received peer Init message from {}: {}", log_pubkey!(peer.their_node_id.unwrap()), msg.features);
1072 // For peers not supporting gossip queries start sync now, otherwise wait until we receive a filter.
1073 if msg.features.initial_routing_sync() && !msg.features.supports_gossip_queries() {
1074 peer.sync_status = InitSyncTracker::ChannelsSyncing(0);
1076 if !msg.features.supports_static_remote_key() {
1077 log_debug!(self.logger, "Peer {} does not support static remote key, disconnecting with no_connection_possible", log_pubkey!(peer.their_node_id.unwrap()));
1078 return Err(PeerHandleError{ no_connection_possible: true }.into());
1081 self.message_handler.route_handler.peer_connected(&peer.their_node_id.unwrap(), &msg);
1083 self.message_handler.chan_handler.peer_connected(&peer.their_node_id.unwrap(), &msg);
1084 peer.their_features = Some(msg.features);
1086 wire::Message::Error(msg) => {
1087 let mut data_is_printable = true;
1088 for b in msg.data.bytes() {
1089 if b < 32 || b > 126 {
1090 data_is_printable = false;
1095 if data_is_printable {
1096 log_debug!(self.logger, "Got Err message from {}: {}", log_pubkey!(peer.their_node_id.unwrap()), msg.data);
1098 log_debug!(self.logger, "Got Err message from {} with non-ASCII error message", log_pubkey!(peer.their_node_id.unwrap()));
1100 self.message_handler.chan_handler.handle_error(&peer.their_node_id.unwrap(), &msg);
1101 if msg.channel_id == [0; 32] {
1102 return Err(PeerHandleError{ no_connection_possible: true }.into());
1105 wire::Message::Warning(msg) => {
1106 let mut data_is_printable = true;
1107 for b in msg.data.bytes() {
1108 if b < 32 || b > 126 {
1109 data_is_printable = false;
1114 if data_is_printable {
1115 log_debug!(self.logger, "Got warning message from {}: {}", log_pubkey!(peer.their_node_id.unwrap()), msg.data);
1117 log_debug!(self.logger, "Got warning message from {} with non-ASCII error message", log_pubkey!(peer.their_node_id.unwrap()));
1121 wire::Message::Ping(msg) => {
1122 if msg.ponglen < 65532 {
1123 let resp = msgs::Pong { byteslen: msg.ponglen };
1124 self.enqueue_message(peer, &resp);
1127 wire::Message::Pong(_msg) => {
1128 peer.awaiting_pong_timer_tick_intervals = 0;
1129 peer.msgs_sent_since_pong = 0;
1132 // Channel messages:
1133 wire::Message::OpenChannel(msg) => {
1134 self.message_handler.chan_handler.handle_open_channel(&peer.their_node_id.unwrap(), peer.their_features.clone().unwrap(), &msg);
1136 wire::Message::AcceptChannel(msg) => {
1137 self.message_handler.chan_handler.handle_accept_channel(&peer.their_node_id.unwrap(), peer.their_features.clone().unwrap(), &msg);
1140 wire::Message::FundingCreated(msg) => {
1141 self.message_handler.chan_handler.handle_funding_created(&peer.their_node_id.unwrap(), &msg);
1143 wire::Message::FundingSigned(msg) => {
1144 self.message_handler.chan_handler.handle_funding_signed(&peer.their_node_id.unwrap(), &msg);
1146 wire::Message::FundingLocked(msg) => {
1147 self.message_handler.chan_handler.handle_funding_locked(&peer.their_node_id.unwrap(), &msg);
1150 wire::Message::Shutdown(msg) => {
1151 self.message_handler.chan_handler.handle_shutdown(&peer.their_node_id.unwrap(), peer.their_features.as_ref().unwrap(), &msg);
1153 wire::Message::ClosingSigned(msg) => {
1154 self.message_handler.chan_handler.handle_closing_signed(&peer.their_node_id.unwrap(), &msg);
1157 // Commitment messages:
1158 wire::Message::UpdateAddHTLC(msg) => {
1159 self.message_handler.chan_handler.handle_update_add_htlc(&peer.their_node_id.unwrap(), &msg);
1161 wire::Message::UpdateFulfillHTLC(msg) => {
1162 self.message_handler.chan_handler.handle_update_fulfill_htlc(&peer.their_node_id.unwrap(), &msg);
1164 wire::Message::UpdateFailHTLC(msg) => {
1165 self.message_handler.chan_handler.handle_update_fail_htlc(&peer.their_node_id.unwrap(), &msg);
1167 wire::Message::UpdateFailMalformedHTLC(msg) => {
1168 self.message_handler.chan_handler.handle_update_fail_malformed_htlc(&peer.their_node_id.unwrap(), &msg);
1171 wire::Message::CommitmentSigned(msg) => {
1172 self.message_handler.chan_handler.handle_commitment_signed(&peer.their_node_id.unwrap(), &msg);
1174 wire::Message::RevokeAndACK(msg) => {
1175 self.message_handler.chan_handler.handle_revoke_and_ack(&peer.their_node_id.unwrap(), &msg);
1177 wire::Message::UpdateFee(msg) => {
1178 self.message_handler.chan_handler.handle_update_fee(&peer.their_node_id.unwrap(), &msg);
1180 wire::Message::ChannelReestablish(msg) => {
1181 self.message_handler.chan_handler.handle_channel_reestablish(&peer.their_node_id.unwrap(), &msg);
1184 // Routing messages:
1185 wire::Message::AnnouncementSignatures(msg) => {
1186 self.message_handler.chan_handler.handle_announcement_signatures(&peer.their_node_id.unwrap(), &msg);
1188 wire::Message::ChannelAnnouncement(msg) => {
1189 if self.message_handler.route_handler.handle_channel_announcement(&msg)
1190 .map_err(|e| -> MessageHandlingError { e.into() })? {
1191 should_forward = Some(wire::Message::ChannelAnnouncement(msg));
1194 wire::Message::NodeAnnouncement(msg) => {
1195 if self.message_handler.route_handler.handle_node_announcement(&msg)
1196 .map_err(|e| -> MessageHandlingError { e.into() })? {
1197 should_forward = Some(wire::Message::NodeAnnouncement(msg));
1200 wire::Message::ChannelUpdate(msg) => {
1201 self.message_handler.chan_handler.handle_channel_update(&peer.their_node_id.unwrap(), &msg);
1202 if self.message_handler.route_handler.handle_channel_update(&msg)
1203 .map_err(|e| -> MessageHandlingError { e.into() })? {
1204 should_forward = Some(wire::Message::ChannelUpdate(msg));
1207 wire::Message::QueryShortChannelIds(msg) => {
1208 self.message_handler.route_handler.handle_query_short_channel_ids(&peer.their_node_id.unwrap(), msg)?;
1210 wire::Message::ReplyShortChannelIdsEnd(msg) => {
1211 self.message_handler.route_handler.handle_reply_short_channel_ids_end(&peer.their_node_id.unwrap(), msg)?;
1213 wire::Message::QueryChannelRange(msg) => {
1214 self.message_handler.route_handler.handle_query_channel_range(&peer.their_node_id.unwrap(), msg)?;
1216 wire::Message::ReplyChannelRange(msg) => {
1217 self.message_handler.route_handler.handle_reply_channel_range(&peer.their_node_id.unwrap(), msg)?;
1219 wire::Message::GossipTimestampFilter(_msg) => {
1220 // When supporting gossip messages, start inital gossip sync only after we receive
1221 // a GossipTimestampFilter
1222 if peer.their_features.as_ref().unwrap().supports_gossip_queries() &&
1223 !peer.sent_gossip_timestamp_filter {
1224 peer.sent_gossip_timestamp_filter = true;
1225 peer.sync_status = InitSyncTracker::ChannelsSyncing(0);
1229 // Unknown messages:
1230 wire::Message::Unknown(type_id) if message.is_even() => {
1231 log_debug!(self.logger, "Received unknown even message of type {}, disconnecting peer!", type_id);
1232 // Fail the channel if message is an even, unknown type as per BOLT #1.
1233 return Err(PeerHandleError{ no_connection_possible: true }.into());
1235 wire::Message::Unknown(type_id) => {
1236 log_trace!(self.logger, "Received unknown odd message of type {}, ignoring", type_id);
1238 wire::Message::Custom(custom) => {
1239 self.custom_message_handler.handle_custom_message(custom, &peer.their_node_id.unwrap())?;
1245 fn forward_broadcast_msg(&self, peers: &mut PeerHolder<Descriptor>, msg: &wire::Message<<<CMH as core::ops::Deref>::Target as wire::CustomMessageReader>::CustomMessage>, except_node: Option<&PublicKey>) {
1247 wire::Message::ChannelAnnouncement(ref msg) => {
1248 log_gossip!(self.logger, "Sending message to all peers except {:?} or the announced channel's counterparties: {:?}", except_node, msg);
1249 let encoded_msg = encode_msg!(msg);
1251 for (_, peer) in peers.peers.iter_mut() {
1252 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1253 !peer.should_forward_channel_announcement(msg.contents.short_channel_id) {
1256 if peer.pending_outbound_buffer.len() > OUTBOUND_BUFFER_LIMIT_DROP_GOSSIP
1257 || peer.msgs_sent_since_pong > BUFFER_DRAIN_MSGS_PER_TICK * FORWARD_INIT_SYNC_BUFFER_LIMIT_RATIO
1259 log_gossip!(self.logger, "Skipping broadcast message to {:?} as its outbound buffer is full", peer.their_node_id);
1262 if peer.their_node_id.as_ref() == Some(&msg.contents.node_id_1) ||
1263 peer.their_node_id.as_ref() == Some(&msg.contents.node_id_2) {
1266 if except_node.is_some() && peer.their_node_id.as_ref() == except_node {
1269 self.enqueue_encoded_message(peer, &encoded_msg);
1272 wire::Message::NodeAnnouncement(ref msg) => {
1273 log_gossip!(self.logger, "Sending message to all peers except {:?} or the announced node: {:?}", except_node, msg);
1274 let encoded_msg = encode_msg!(msg);
1276 for (_, peer) in peers.peers.iter_mut() {
1277 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1278 !peer.should_forward_node_announcement(msg.contents.node_id) {
1281 if peer.pending_outbound_buffer.len() > OUTBOUND_BUFFER_LIMIT_DROP_GOSSIP
1282 || peer.msgs_sent_since_pong > BUFFER_DRAIN_MSGS_PER_TICK * FORWARD_INIT_SYNC_BUFFER_LIMIT_RATIO
1284 log_gossip!(self.logger, "Skipping broadcast message to {:?} as its outbound buffer is full", peer.their_node_id);
1287 if peer.their_node_id.as_ref() == Some(&msg.contents.node_id) {
1290 if except_node.is_some() && peer.their_node_id.as_ref() == except_node {
1293 self.enqueue_encoded_message(peer, &encoded_msg);
1296 wire::Message::ChannelUpdate(ref msg) => {
1297 log_gossip!(self.logger, "Sending message to all peers except {:?}: {:?}", except_node, msg);
1298 let encoded_msg = encode_msg!(msg);
1300 for (_, peer) in peers.peers.iter_mut() {
1301 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1302 !peer.should_forward_channel_announcement(msg.contents.short_channel_id) {
1305 if peer.pending_outbound_buffer.len() > OUTBOUND_BUFFER_LIMIT_DROP_GOSSIP
1306 || peer.msgs_sent_since_pong > BUFFER_DRAIN_MSGS_PER_TICK * FORWARD_INIT_SYNC_BUFFER_LIMIT_RATIO
1308 log_gossip!(self.logger, "Skipping broadcast message to {:?} as its outbound buffer is full", peer.their_node_id);
1311 if except_node.is_some() && peer.their_node_id.as_ref() == except_node {
1314 self.enqueue_encoded_message(peer, &encoded_msg);
1317 _ => debug_assert!(false, "We shouldn't attempt to forward anything but gossip messages"),
1321 /// Checks for any events generated by our handlers and processes them. Includes sending most
1322 /// response messages as well as messages generated by calls to handler functions directly (eg
1323 /// functions like [`ChannelManager::process_pending_htlc_forwards`] or [`send_payment`]).
1325 /// May call [`send_data`] on [`SocketDescriptor`]s. Thus, be very careful with reentrancy
1328 /// You don't have to call this function explicitly if you are using [`lightning-net-tokio`]
1329 /// or one of the other clients provided in our language bindings.
1331 /// [`send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
1332 /// [`ChannelManager::process_pending_htlc_forwards`]: crate::ln::channelmanager::ChannelManager::process_pending_htlc_forwards
1333 /// [`send_data`]: SocketDescriptor::send_data
1334 pub fn process_events(&self) {
1336 // TODO: There are some DoS attacks here where you can flood someone's outbound send
1337 // buffer by doing things like announcing channels on another node. We should be willing to
1338 // drop optional-ish messages when send buffers get full!
1340 let mut peers_lock = self.peers.lock().unwrap();
1341 let mut events_generated = self.message_handler.chan_handler.get_and_clear_pending_msg_events();
1342 events_generated.append(&mut self.message_handler.route_handler.get_and_clear_pending_msg_events());
1343 let peers = &mut *peers_lock;
1344 macro_rules! get_peer_for_forwarding {
1345 ($node_id: expr) => {
1347 match peers.node_id_to_descriptor.get($node_id) {
1348 Some(descriptor) => match peers.peers.get_mut(&descriptor) {
1350 if peer.their_features.is_none() {
1355 None => panic!("Inconsistent peers set state!"),
1364 for event in events_generated.drain(..) {
1366 MessageSendEvent::SendAcceptChannel { ref node_id, ref msg } => {
1367 log_debug!(self.logger, "Handling SendAcceptChannel event in peer_handler for node {} for channel {}",
1368 log_pubkey!(node_id),
1369 log_bytes!(msg.temporary_channel_id));
1370 self.enqueue_message(get_peer_for_forwarding!(node_id), msg);
1372 MessageSendEvent::SendOpenChannel { ref node_id, ref msg } => {
1373 log_debug!(self.logger, "Handling SendOpenChannel event in peer_handler for node {} for channel {}",
1374 log_pubkey!(node_id),
1375 log_bytes!(msg.temporary_channel_id));
1376 self.enqueue_message(get_peer_for_forwarding!(node_id), msg);
1378 MessageSendEvent::SendFundingCreated { ref node_id, ref msg } => {
1379 log_debug!(self.logger, "Handling SendFundingCreated event in peer_handler for node {} for channel {} (which becomes {})",
1380 log_pubkey!(node_id),
1381 log_bytes!(msg.temporary_channel_id),
1382 log_funding_channel_id!(msg.funding_txid, msg.funding_output_index));
1383 // TODO: If the peer is gone we should generate a DiscardFunding event
1384 // indicating to the wallet that they should just throw away this funding transaction
1385 self.enqueue_message(get_peer_for_forwarding!(node_id), msg);
1387 MessageSendEvent::SendFundingSigned { ref node_id, ref msg } => {
1388 log_debug!(self.logger, "Handling SendFundingSigned event in peer_handler for node {} for channel {}",
1389 log_pubkey!(node_id),
1390 log_bytes!(msg.channel_id));
1391 self.enqueue_message(get_peer_for_forwarding!(node_id), msg);
1393 MessageSendEvent::SendFundingLocked { ref node_id, ref msg } => {
1394 log_debug!(self.logger, "Handling SendFundingLocked event in peer_handler for node {} for channel {}",
1395 log_pubkey!(node_id),
1396 log_bytes!(msg.channel_id));
1397 self.enqueue_message(get_peer_for_forwarding!(node_id), msg);
1399 MessageSendEvent::SendAnnouncementSignatures { ref node_id, ref msg } => {
1400 log_debug!(self.logger, "Handling SendAnnouncementSignatures event in peer_handler for node {} for channel {})",
1401 log_pubkey!(node_id),
1402 log_bytes!(msg.channel_id));
1403 self.enqueue_message(get_peer_for_forwarding!(node_id), msg);
1405 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 } } => {
1406 log_debug!(self.logger, "Handling UpdateHTLCs event in peer_handler for node {} with {} adds, {} fulfills, {} fails for channel {}",
1407 log_pubkey!(node_id),
1408 update_add_htlcs.len(),
1409 update_fulfill_htlcs.len(),
1410 update_fail_htlcs.len(),
1411 log_bytes!(commitment_signed.channel_id));
1412 let peer = get_peer_for_forwarding!(node_id);
1413 for msg in update_add_htlcs {
1414 self.enqueue_message(peer, msg);
1416 for msg in update_fulfill_htlcs {
1417 self.enqueue_message(peer, msg);
1419 for msg in update_fail_htlcs {
1420 self.enqueue_message(peer, msg);
1422 for msg in update_fail_malformed_htlcs {
1423 self.enqueue_message(peer, msg);
1425 if let &Some(ref msg) = update_fee {
1426 self.enqueue_message(peer, msg);
1428 self.enqueue_message(peer, commitment_signed);
1430 MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
1431 log_debug!(self.logger, "Handling SendRevokeAndACK event in peer_handler for node {} for channel {}",
1432 log_pubkey!(node_id),
1433 log_bytes!(msg.channel_id));
1434 self.enqueue_message(get_peer_for_forwarding!(node_id), msg);
1436 MessageSendEvent::SendClosingSigned { ref node_id, ref msg } => {
1437 log_debug!(self.logger, "Handling SendClosingSigned event in peer_handler for node {} for channel {}",
1438 log_pubkey!(node_id),
1439 log_bytes!(msg.channel_id));
1440 self.enqueue_message(get_peer_for_forwarding!(node_id), msg);
1442 MessageSendEvent::SendShutdown { ref node_id, ref msg } => {
1443 log_debug!(self.logger, "Handling Shutdown event in peer_handler for node {} for channel {}",
1444 log_pubkey!(node_id),
1445 log_bytes!(msg.channel_id));
1446 self.enqueue_message(get_peer_for_forwarding!(node_id), msg);
1448 MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
1449 log_debug!(self.logger, "Handling SendChannelReestablish event in peer_handler for node {} for channel {}",
1450 log_pubkey!(node_id),
1451 log_bytes!(msg.channel_id));
1452 self.enqueue_message(get_peer_for_forwarding!(node_id), msg);
1454 MessageSendEvent::BroadcastChannelAnnouncement { msg, update_msg } => {
1455 log_debug!(self.logger, "Handling BroadcastChannelAnnouncement event in peer_handler for short channel id {}", msg.contents.short_channel_id);
1456 match self.message_handler.route_handler.handle_channel_announcement(&msg) {
1457 Ok(_) | Err(LightningError { action: msgs::ErrorAction::IgnoreDuplicateGossip, .. }) =>
1458 self.forward_broadcast_msg(peers, &wire::Message::ChannelAnnouncement(msg), None),
1461 match self.message_handler.route_handler.handle_channel_update(&update_msg) {
1462 Ok(_) | Err(LightningError { action: msgs::ErrorAction::IgnoreDuplicateGossip, .. }) =>
1463 self.forward_broadcast_msg(peers, &wire::Message::ChannelUpdate(update_msg), None),
1467 MessageSendEvent::BroadcastNodeAnnouncement { msg } => {
1468 log_debug!(self.logger, "Handling BroadcastNodeAnnouncement event in peer_handler");
1469 match self.message_handler.route_handler.handle_node_announcement(&msg) {
1470 Ok(_) | Err(LightningError { action: msgs::ErrorAction::IgnoreDuplicateGossip, .. }) =>
1471 self.forward_broadcast_msg(peers, &wire::Message::NodeAnnouncement(msg), None),
1475 MessageSendEvent::BroadcastChannelUpdate { msg } => {
1476 log_debug!(self.logger, "Handling BroadcastChannelUpdate event in peer_handler for short channel id {}", msg.contents.short_channel_id);
1477 match self.message_handler.route_handler.handle_channel_update(&msg) {
1478 Ok(_) | Err(LightningError { action: msgs::ErrorAction::IgnoreDuplicateGossip, .. }) =>
1479 self.forward_broadcast_msg(peers, &wire::Message::ChannelUpdate(msg), None),
1483 MessageSendEvent::SendChannelUpdate { ref node_id, ref msg } => {
1484 log_trace!(self.logger, "Handling SendChannelUpdate event in peer_handler for node {} for channel {}",
1485 log_pubkey!(node_id), msg.contents.short_channel_id);
1486 let peer = get_peer_for_forwarding!(node_id);
1487 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1489 MessageSendEvent::HandleError { ref node_id, ref action } => {
1491 msgs::ErrorAction::DisconnectPeer { ref msg } => {
1492 if let Some(mut descriptor) = peers.node_id_to_descriptor.remove(node_id) {
1493 if let Some(mut peer) = peers.peers.remove(&descriptor) {
1494 if let Some(ref msg) = *msg {
1495 log_trace!(self.logger, "Handling DisconnectPeer HandleError event in peer_handler for node {} with message {}",
1496 log_pubkey!(node_id),
1498 self.enqueue_message(&mut peer, msg);
1499 // This isn't guaranteed to work, but if there is enough free
1500 // room in the send buffer, put the error message there...
1501 self.do_attempt_write_data(&mut descriptor, &mut peer);
1503 log_gossip!(self.logger, "Handling DisconnectPeer HandleError event in peer_handler for node {} with no message", log_pubkey!(node_id));
1506 descriptor.disconnect_socket();
1507 self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1510 msgs::ErrorAction::IgnoreAndLog(level) => {
1511 log_given_level!(self.logger, level, "Received a HandleError event to be ignored for node {}", log_pubkey!(node_id));
1513 msgs::ErrorAction::IgnoreDuplicateGossip => {},
1514 msgs::ErrorAction::IgnoreError => {
1515 log_debug!(self.logger, "Received a HandleError event to be ignored for node {}", log_pubkey!(node_id));
1517 msgs::ErrorAction::SendErrorMessage { ref msg } => {
1518 log_trace!(self.logger, "Handling SendErrorMessage HandleError event in peer_handler for node {} with message {}",
1519 log_pubkey!(node_id),
1521 self.enqueue_message(get_peer_for_forwarding!(node_id), msg);
1523 msgs::ErrorAction::SendWarningMessage { ref msg, ref log_level } => {
1524 log_given_level!(self.logger, *log_level, "Handling SendWarningMessage HandleError event in peer_handler for node {} with message {}",
1525 log_pubkey!(node_id),
1527 self.enqueue_message(get_peer_for_forwarding!(node_id), msg);
1531 MessageSendEvent::SendChannelRangeQuery { ref node_id, ref msg } => {
1532 self.enqueue_message(get_peer_for_forwarding!(node_id), msg);
1534 MessageSendEvent::SendShortIdsQuery { ref node_id, ref msg } => {
1535 self.enqueue_message(get_peer_for_forwarding!(node_id), msg);
1537 MessageSendEvent::SendReplyChannelRange { ref node_id, ref msg } => {
1538 log_gossip!(self.logger, "Handling SendReplyChannelRange event in peer_handler for node {} with num_scids={} first_blocknum={} number_of_blocks={}, sync_complete={}",
1539 log_pubkey!(node_id),
1540 msg.short_channel_ids.len(),
1542 msg.number_of_blocks,
1544 self.enqueue_message(get_peer_for_forwarding!(node_id), msg);
1546 MessageSendEvent::SendGossipTimestampFilter { ref node_id, ref msg } => {
1547 self.enqueue_message(get_peer_for_forwarding!(node_id), msg);
1552 for (node_id, msg) in self.custom_message_handler.get_and_clear_pending_msg() {
1553 self.enqueue_message(get_peer_for_forwarding!(&node_id), &msg);
1556 for (descriptor, peer) in peers.peers.iter_mut() {
1557 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
1562 /// Indicates that the given socket descriptor's connection is now closed.
1563 pub fn socket_disconnected(&self, descriptor: &Descriptor) {
1564 self.disconnect_event_internal(descriptor, false);
1567 fn disconnect_event_internal(&self, descriptor: &Descriptor, no_connection_possible: bool) {
1568 let mut peers = self.peers.lock().unwrap();
1569 let peer_option = peers.peers.remove(descriptor);
1572 // This is most likely a simple race condition where the user found that the socket
1573 // was disconnected, then we told the user to `disconnect_socket()`, then they
1574 // called this method. Either way we're disconnected, return.
1577 match peer.their_node_id {
1579 log_trace!(self.logger,
1580 "Handling disconnection of peer {}, with {}future connection to the peer possible.",
1581 log_pubkey!(node_id), if no_connection_possible { "no " } else { "" });
1582 peers.node_id_to_descriptor.remove(&node_id);
1583 self.message_handler.chan_handler.peer_disconnected(&node_id, no_connection_possible);
1591 /// Disconnect a peer given its node id.
1593 /// Set `no_connection_possible` to true to prevent any further connection with this peer,
1594 /// force-closing any channels we have with it.
1596 /// If a peer is connected, this will call [`disconnect_socket`] on the descriptor for the
1597 /// peer. Thus, be very careful about reentrancy issues.
1599 /// [`disconnect_socket`]: SocketDescriptor::disconnect_socket
1600 pub fn disconnect_by_node_id(&self, node_id: PublicKey, no_connection_possible: bool) {
1601 let mut peers_lock = self.peers.lock().unwrap();
1602 if let Some(mut descriptor) = peers_lock.node_id_to_descriptor.remove(&node_id) {
1603 log_trace!(self.logger, "Disconnecting peer with id {} due to client request", node_id);
1604 peers_lock.peers.remove(&descriptor);
1605 self.message_handler.chan_handler.peer_disconnected(&node_id, no_connection_possible);
1606 descriptor.disconnect_socket();
1610 /// Disconnects all currently-connected peers. This is useful on platforms where there may be
1611 /// an indication that TCP sockets have stalled even if we weren't around to time them out
1612 /// using regular ping/pongs.
1613 pub fn disconnect_all_peers(&self) {
1614 let mut peers_lock = self.peers.lock().unwrap();
1615 let peers = &mut *peers_lock;
1616 for (mut descriptor, peer) in peers.peers.drain() {
1617 if let Some(node_id) = peer.their_node_id {
1618 log_trace!(self.logger, "Disconnecting peer with id {} due to client request to disconnect all peers", node_id);
1619 peers.node_id_to_descriptor.remove(&node_id);
1620 self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1622 descriptor.disconnect_socket();
1624 debug_assert!(peers.node_id_to_descriptor.is_empty());
1627 /// This is called when we're blocked on sending additional gossip messages until we receive a
1628 /// pong. If we aren't waiting on a pong, we take this opportunity to send a ping (setting
1629 /// `awaiting_pong_timer_tick_intervals` to a special flag value to indicate this).
1630 fn maybe_send_extra_ping(&self, peer: &mut Peer) {
1631 if peer.awaiting_pong_timer_tick_intervals == 0 {
1632 peer.awaiting_pong_timer_tick_intervals = -1;
1633 let ping = msgs::Ping {
1637 self.enqueue_message(peer, &ping);
1641 /// Send pings to each peer and disconnect those which did not respond to the last round of
1644 /// This may be called on any timescale you want, however, roughly once every ten seconds is
1645 /// preferred. The call rate determines both how often we send a ping to our peers and how much
1646 /// time they have to respond before we disconnect them.
1648 /// May call [`send_data`] on all [`SocketDescriptor`]s. Thus, be very careful with reentrancy
1651 /// [`send_data`]: SocketDescriptor::send_data
1652 pub fn timer_tick_occurred(&self) {
1653 let mut peers_lock = self.peers.lock().unwrap();
1655 let peers = &mut *peers_lock;
1656 let node_id_to_descriptor = &mut peers.node_id_to_descriptor;
1657 let peers = &mut peers.peers;
1658 let mut descriptors_needing_disconnect = Vec::new();
1659 let peer_count = peers.len();
1661 peers.retain(|descriptor, peer| {
1662 let mut do_disconnect_peer = false;
1663 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_node_id.is_none() {
1664 // The peer needs to complete its handshake before we can exchange messages. We
1665 // give peers one timer tick to complete handshake, reusing
1666 // `awaiting_pong_timer_tick_intervals` to track number of timer ticks taken
1667 // for handshake completion.
1668 if peer.awaiting_pong_timer_tick_intervals != 0 {
1669 do_disconnect_peer = true;
1671 peer.awaiting_pong_timer_tick_intervals = 1;
1676 if peer.awaiting_pong_timer_tick_intervals == -1 {
1677 // Magic value set in `maybe_send_extra_ping`.
1678 peer.awaiting_pong_timer_tick_intervals = 1;
1679 peer.received_message_since_timer_tick = false;
1683 if do_disconnect_peer
1684 || (peer.awaiting_pong_timer_tick_intervals > 0 && !peer.received_message_since_timer_tick)
1685 || peer.awaiting_pong_timer_tick_intervals as u64 >
1686 MAX_BUFFER_DRAIN_TICK_INTERVALS_PER_PEER as u64 * peer_count as u64
1688 descriptors_needing_disconnect.push(descriptor.clone());
1689 match peer.their_node_id {
1691 log_trace!(self.logger, "Disconnecting peer with id {} due to ping timeout", node_id);
1692 node_id_to_descriptor.remove(&node_id);
1693 self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1699 peer.received_message_since_timer_tick = false;
1701 if peer.awaiting_pong_timer_tick_intervals > 0 {
1702 peer.awaiting_pong_timer_tick_intervals += 1;
1706 peer.awaiting_pong_timer_tick_intervals = 1;
1707 let ping = msgs::Ping {
1711 self.enqueue_message(peer, &ping);
1712 self.do_attempt_write_data(&mut (descriptor.clone()), &mut *peer);
1717 for mut descriptor in descriptors_needing_disconnect.drain(..) {
1718 descriptor.disconnect_socket();
1724 fn is_gossip_msg(type_id: u16) -> bool {
1726 msgs::ChannelAnnouncement::TYPE |
1727 msgs::ChannelUpdate::TYPE |
1728 msgs::NodeAnnouncement::TYPE => true,
1735 use ln::peer_handler::{PeerManager, MessageHandler, SocketDescriptor, IgnoringMessageHandler, filter_addresses};
1737 use ln::msgs::NetAddress;
1739 use util::test_utils;
1741 use bitcoin::secp256k1::Secp256k1;
1742 use bitcoin::secp256k1::key::{SecretKey, PublicKey};
1745 use sync::{Arc, Mutex};
1746 use core::sync::atomic::Ordering;
1749 struct FileDescriptor {
1751 outbound_data: Arc<Mutex<Vec<u8>>>,
1753 impl PartialEq for FileDescriptor {
1754 fn eq(&self, other: &Self) -> bool {
1758 impl Eq for FileDescriptor { }
1759 impl core::hash::Hash for FileDescriptor {
1760 fn hash<H: core::hash::Hasher>(&self, hasher: &mut H) {
1761 self.fd.hash(hasher)
1765 impl SocketDescriptor for FileDescriptor {
1766 fn send_data(&mut self, data: &[u8], _resume_read: bool) -> usize {
1767 self.outbound_data.lock().unwrap().extend_from_slice(data);
1771 fn disconnect_socket(&mut self) {}
1774 struct PeerManagerCfg {
1775 chan_handler: test_utils::TestChannelMessageHandler,
1776 routing_handler: test_utils::TestRoutingMessageHandler,
1777 logger: test_utils::TestLogger,
1780 fn create_peermgr_cfgs(peer_count: usize) -> Vec<PeerManagerCfg> {
1781 let mut cfgs = Vec::new();
1782 for _ in 0..peer_count {
1785 chan_handler: test_utils::TestChannelMessageHandler::new(),
1786 logger: test_utils::TestLogger::new(),
1787 routing_handler: test_utils::TestRoutingMessageHandler::new(),
1795 fn create_network<'a>(peer_count: usize, cfgs: &'a Vec<PeerManagerCfg>) -> Vec<PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, &'a test_utils::TestLogger, IgnoringMessageHandler>> {
1796 let mut peers = Vec::new();
1797 for i in 0..peer_count {
1798 let node_secret = SecretKey::from_slice(&[42 + i as u8; 32]).unwrap();
1799 let ephemeral_bytes = [i as u8; 32];
1800 let msg_handler = MessageHandler { chan_handler: &cfgs[i].chan_handler, route_handler: &cfgs[i].routing_handler };
1801 let peer = PeerManager::new(msg_handler, node_secret, &ephemeral_bytes, &cfgs[i].logger, IgnoringMessageHandler {});
1808 fn establish_connection<'a>(peer_a: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, &'a test_utils::TestLogger, IgnoringMessageHandler>, peer_b: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, &'a test_utils::TestLogger, IgnoringMessageHandler>) -> (FileDescriptor, FileDescriptor) {
1809 let secp_ctx = Secp256k1::new();
1810 let a_id = PublicKey::from_secret_key(&secp_ctx, &peer_a.our_node_secret);
1811 let mut fd_a = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
1812 let mut fd_b = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
1813 let initial_data = peer_b.new_outbound_connection(a_id, fd_b.clone(), None).unwrap();
1814 peer_a.new_inbound_connection(fd_a.clone(), None).unwrap();
1815 assert_eq!(peer_a.read_event(&mut fd_a, &initial_data).unwrap(), false);
1816 peer_a.process_events();
1817 assert_eq!(peer_b.read_event(&mut fd_b, &fd_a.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1818 peer_b.process_events();
1819 assert_eq!(peer_a.read_event(&mut fd_a, &fd_b.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1820 peer_a.process_events();
1821 assert_eq!(peer_b.read_event(&mut fd_b, &fd_a.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1822 (fd_a.clone(), fd_b.clone())
1826 fn test_disconnect_peer() {
1827 // Simple test which builds a network of PeerManager, connects and brings them to NoiseState::Finished and
1828 // push a DisconnectPeer event to remove the node flagged by id
1829 let cfgs = create_peermgr_cfgs(2);
1830 let chan_handler = test_utils::TestChannelMessageHandler::new();
1831 let mut peers = create_network(2, &cfgs);
1832 establish_connection(&peers[0], &peers[1]);
1833 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1835 let secp_ctx = Secp256k1::new();
1836 let their_id = PublicKey::from_secret_key(&secp_ctx, &peers[1].our_node_secret);
1838 chan_handler.pending_events.lock().unwrap().push(events::MessageSendEvent::HandleError {
1840 action: msgs::ErrorAction::DisconnectPeer { msg: None },
1842 assert_eq!(chan_handler.pending_events.lock().unwrap().len(), 1);
1843 peers[0].message_handler.chan_handler = &chan_handler;
1845 peers[0].process_events();
1846 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 0);
1850 fn test_timer_tick_occurred() {
1851 // Create peers, a vector of two peer managers, perform initial set up and check that peers[0] has one Peer.
1852 let cfgs = create_peermgr_cfgs(2);
1853 let peers = create_network(2, &cfgs);
1854 establish_connection(&peers[0], &peers[1]);
1855 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1857 // peers[0] awaiting_pong is set to true, but the Peer is still connected
1858 peers[0].timer_tick_occurred();
1859 peers[0].process_events();
1860 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1862 // Since timer_tick_occurred() is called again when awaiting_pong is true, all Peers are disconnected
1863 peers[0].timer_tick_occurred();
1864 peers[0].process_events();
1865 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 0);
1869 fn test_do_attempt_write_data() {
1870 // Create 2 peers with custom TestRoutingMessageHandlers and connect them.
1871 let cfgs = create_peermgr_cfgs(2);
1872 cfgs[0].routing_handler.request_full_sync.store(true, Ordering::Release);
1873 cfgs[1].routing_handler.request_full_sync.store(true, Ordering::Release);
1874 let peers = create_network(2, &cfgs);
1876 // By calling establish_connect, we trigger do_attempt_write_data between
1877 // the peers. Previously this function would mistakenly enter an infinite loop
1878 // when there were more channel messages available than could fit into a peer's
1879 // buffer. This issue would now be detected by this test (because we use custom
1880 // RoutingMessageHandlers that intentionally return more channel messages
1881 // than can fit into a peer's buffer).
1882 let (mut fd_a, mut fd_b) = establish_connection(&peers[0], &peers[1]);
1884 // Make each peer to read the messages that the other peer just wrote to them. Note that
1885 // due to the max-message-before-ping limits this may take a few iterations to complete.
1886 for _ in 0..150/super::BUFFER_DRAIN_MSGS_PER_TICK + 1 {
1887 peers[1].process_events();
1888 let a_read_data = fd_b.outbound_data.lock().unwrap().split_off(0);
1889 assert!(!a_read_data.is_empty());
1891 peers[0].read_event(&mut fd_a, &a_read_data).unwrap();
1892 peers[0].process_events();
1894 let b_read_data = fd_a.outbound_data.lock().unwrap().split_off(0);
1895 assert!(!b_read_data.is_empty());
1896 peers[1].read_event(&mut fd_b, &b_read_data).unwrap();
1898 peers[0].process_events();
1899 assert_eq!(fd_a.outbound_data.lock().unwrap().len(), 0, "Until A receives data, it shouldn't send more messages");
1902 // Check that each peer has received the expected number of channel updates and channel
1904 assert_eq!(cfgs[0].routing_handler.chan_upds_recvd.load(Ordering::Acquire), 100);
1905 assert_eq!(cfgs[0].routing_handler.chan_anns_recvd.load(Ordering::Acquire), 50);
1906 assert_eq!(cfgs[1].routing_handler.chan_upds_recvd.load(Ordering::Acquire), 100);
1907 assert_eq!(cfgs[1].routing_handler.chan_anns_recvd.load(Ordering::Acquire), 50);
1911 fn test_handshake_timeout() {
1912 // Tests that we time out a peer still waiting on handshake completion after a full timer
1914 let cfgs = create_peermgr_cfgs(2);
1915 cfgs[0].routing_handler.request_full_sync.store(true, Ordering::Release);
1916 cfgs[1].routing_handler.request_full_sync.store(true, Ordering::Release);
1917 let peers = create_network(2, &cfgs);
1919 let secp_ctx = Secp256k1::new();
1920 let a_id = PublicKey::from_secret_key(&secp_ctx, &peers[0].our_node_secret);
1921 let mut fd_a = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
1922 let mut fd_b = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
1923 let initial_data = peers[1].new_outbound_connection(a_id, fd_b.clone(), None).unwrap();
1924 peers[0].new_inbound_connection(fd_a.clone(), None).unwrap();
1926 // If we get a single timer tick before completion, that's fine
1927 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1928 peers[0].timer_tick_occurred();
1929 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1931 assert_eq!(peers[0].read_event(&mut fd_a, &initial_data).unwrap(), false);
1932 peers[0].process_events();
1933 assert_eq!(peers[1].read_event(&mut fd_b, &fd_a.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1934 peers[1].process_events();
1936 // ...but if we get a second timer tick, we should disconnect the peer
1937 peers[0].timer_tick_occurred();
1938 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 0);
1940 assert!(peers[0].read_event(&mut fd_a, &fd_b.outbound_data.lock().unwrap().split_off(0)).is_err());
1944 fn test_filter_addresses(){
1945 // Tests the filter_addresses function.
1948 let ip_address = NetAddress::IPv4{addr: [10, 0, 0, 0], port: 1000};
1949 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1950 let ip_address = NetAddress::IPv4{addr: [10, 0, 255, 201], port: 1000};
1951 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1952 let ip_address = NetAddress::IPv4{addr: [10, 255, 255, 255], port: 1000};
1953 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1956 let ip_address = NetAddress::IPv4{addr: [0, 0, 0, 0], port: 1000};
1957 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1958 let ip_address = NetAddress::IPv4{addr: [0, 0, 255, 187], port: 1000};
1959 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1960 let ip_address = NetAddress::IPv4{addr: [0, 255, 255, 255], port: 1000};
1961 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1964 let ip_address = NetAddress::IPv4{addr: [100, 64, 0, 0], port: 1000};
1965 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1966 let ip_address = NetAddress::IPv4{addr: [100, 78, 255, 0], port: 1000};
1967 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1968 let ip_address = NetAddress::IPv4{addr: [100, 127, 255, 255], port: 1000};
1969 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1972 let ip_address = NetAddress::IPv4{addr: [127, 0, 0, 0], port: 1000};
1973 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1974 let ip_address = NetAddress::IPv4{addr: [127, 65, 73, 0], port: 1000};
1975 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1976 let ip_address = NetAddress::IPv4{addr: [127, 255, 255, 255], port: 1000};
1977 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1980 let ip_address = NetAddress::IPv4{addr: [169, 254, 0, 0], port: 1000};
1981 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1982 let ip_address = NetAddress::IPv4{addr: [169, 254, 221, 101], port: 1000};
1983 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1984 let ip_address = NetAddress::IPv4{addr: [169, 254, 255, 255], port: 1000};
1985 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1988 let ip_address = NetAddress::IPv4{addr: [172, 16, 0, 0], port: 1000};
1989 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1990 let ip_address = NetAddress::IPv4{addr: [172, 27, 101, 23], port: 1000};
1991 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1992 let ip_address = NetAddress::IPv4{addr: [172, 31, 255, 255], port: 1000};
1993 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1996 let ip_address = NetAddress::IPv4{addr: [192, 168, 0, 0], port: 1000};
1997 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
1998 let ip_address = NetAddress::IPv4{addr: [192, 168, 205, 159], port: 1000};
1999 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2000 let ip_address = NetAddress::IPv4{addr: [192, 168, 255, 255], port: 1000};
2001 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2003 // For (192.88.99/24)
2004 let ip_address = NetAddress::IPv4{addr: [192, 88, 99, 0], port: 1000};
2005 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2006 let ip_address = NetAddress::IPv4{addr: [192, 88, 99, 140], port: 1000};
2007 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2008 let ip_address = NetAddress::IPv4{addr: [192, 88, 99, 255], port: 1000};
2009 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2011 // For other IPv4 addresses
2012 let ip_address = NetAddress::IPv4{addr: [188, 255, 99, 0], port: 1000};
2013 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2014 let ip_address = NetAddress::IPv4{addr: [123, 8, 129, 14], port: 1000};
2015 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2016 let ip_address = NetAddress::IPv4{addr: [2, 88, 9, 255], port: 1000};
2017 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2020 let ip_address = NetAddress::IPv6{addr: [32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], port: 1000};
2021 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2022 let ip_address = NetAddress::IPv6{addr: [45, 34, 209, 190, 0, 123, 55, 34, 0, 0, 3, 27, 201, 0, 0, 0], port: 1000};
2023 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2024 let ip_address = NetAddress::IPv6{addr: [63, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], port: 1000};
2025 assert_eq!(filter_addresses(Some(ip_address.clone())), Some(ip_address.clone()));
2027 // For other IPv6 addresses
2028 let ip_address = NetAddress::IPv6{addr: [24, 240, 12, 32, 0, 0, 0, 0, 20, 97, 0, 32, 121, 254, 0, 0], port: 1000};
2029 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2030 let ip_address = NetAddress::IPv6{addr: [68, 23, 56, 63, 0, 0, 2, 7, 75, 109, 0, 39, 0, 0, 0, 0], port: 1000};
2031 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2032 let ip_address = NetAddress::IPv6{addr: [101, 38, 140, 230, 100, 0, 30, 98, 0, 26, 0, 0, 57, 96, 0, 0], port: 1000};
2033 assert_eq!(filter_addresses(Some(ip_address.clone())), None);
2036 assert_eq!(filter_addresses(None), None);