From 608d517f9255d22c641fbaaf9dcb56753f214a00 Mon Sep 17 00:00:00 2001 From: Matt Corallo Date: Fri, 19 Oct 2018 16:49:12 -0400 Subject: [PATCH] Send AcceptChannel responses out-of-band to ensure ordered delivery --- fuzz/fuzz_targets/full_stack_target.rs | 2 +- src/ln/channelmanager.rs | 54 ++++++++++++++++---------- src/ln/msgs.rs | 4 +- src/ln/peer_handler.rs | 13 ++++++- src/util/events.rs | 10 ++++- src/util/test_utils.rs | 2 +- 6 files changed, 58 insertions(+), 27 deletions(-) diff --git a/fuzz/fuzz_targets/full_stack_target.rs b/fuzz/fuzz_targets/full_stack_target.rs index bf6de14ae..8b900880f 100644 --- a/fuzz/fuzz_targets/full_stack_target.rs +++ b/fuzz/fuzz_targets/full_stack_target.rs @@ -803,7 +803,7 @@ mod tests { super::do_test(&::hex::decode("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&(Arc::clone(&logger) as Arc)); let log_entries = logger.lines.lock().unwrap(); - assert_eq!(log_entries.get(&("lightning::ln::peer_handler".to_string(), "Encoding and sending message of type 33 to 030000000000000000000000000000000000000000000000000000000000000000".to_string())), Some(&1)); // 1 + assert_eq!(log_entries.get(&("lightning::ln::peer_handler".to_string(), "Handling SendAcceptChannel event in peer_handler for node 030000000000000000000000000000000000000000000000000000000000000000 for channel ff4f00f805273c1b203bb5ebf8436bfde57b3be8c2f5e95d9491dbb181909679".to_string())), Some(&1)); // 1 assert_eq!(log_entries.get(&("lightning::ln::peer_handler".to_string(), "Encoding and sending message of type 35 to 030000000000000000000000000000000000000000000000000000000000000000".to_string())), Some(&1)); // 2 assert_eq!(log_entries.get(&("lightning::ln::peer_handler".to_string(), "Handling SendFundingLocked event in peer_handler for node 030000000000000000000000000000000000000000000000000000000000000000 for channel 3d00000000000000000000000000000000000000000000000000000000000000".to_string())), Some(&1)); // 3 assert_eq!(log_entries.get(&("lightning::ln::peer_handler".to_string(), "Handling SendFundingLocked event in peer_handler for node 030200000000000000000000000000000000000000000000000000000000000000 for channel 3f00000000000000000000000000000000000000000000000000000000000000".to_string())), Some(&1)); // 4 diff --git a/src/ln/channelmanager.rs b/src/ln/channelmanager.rs index bd663c924..0b302e60b 100644 --- a/src/ln/channelmanager.rs +++ b/src/ln/channelmanager.rs @@ -1617,20 +1617,26 @@ impl ChannelManager { } } - fn internal_open_channel(&self, their_node_id: &PublicKey, msg: &msgs::OpenChannel) -> Result { + fn internal_open_channel(&self, their_node_id: &PublicKey, msg: &msgs::OpenChannel) -> Result<(), MsgHandleErrInternal> { if msg.chain_hash != self.genesis_hash { return Err(MsgHandleErrInternal::send_err_msg_no_close("Unknown genesis block hash", msg.temporary_channel_id.clone())); } - let mut channel_state = self.channel_state.lock().unwrap(); - if channel_state.by_id.contains_key(&msg.temporary_channel_id) { - return Err(MsgHandleErrInternal::send_err_msg_no_close("temporary_channel_id collision!", msg.temporary_channel_id.clone())); - } let channel = Channel::new_from_req(&*self.fee_estimator, &self.keys_manager, their_node_id.clone(), msg, 0, false, self.announce_channels_publicly, Arc::clone(&self.logger)) .map_err(|e| MsgHandleErrInternal::from_chan_no_close(e, msg.temporary_channel_id))?; - let accept_msg = channel.get_accept_channel(); - channel_state.by_id.insert(channel.channel_id(), channel); - Ok(accept_msg) + let mut channel_state_lock = self.channel_state.lock().unwrap(); + let channel_state = channel_state_lock.borrow_parts(); + match channel_state.by_id.entry(channel.channel_id()) { + hash_map::Entry::Occupied(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("temporary_channel_id collision!", msg.temporary_channel_id.clone())), + hash_map::Entry::Vacant(entry) => { + channel_state.pending_msg_events.push(events::MessageSendEvent::SendAcceptChannel { + node_id: their_node_id.clone(), + msg: channel.get_accept_channel(), + }); + entry.insert(channel); + } + } + Ok(()) } fn internal_accept_channel(&self, their_node_id: &PublicKey, msg: &msgs::AcceptChannel) -> Result<(), MsgHandleErrInternal> { @@ -2453,7 +2459,7 @@ macro_rules! handle_error { impl ChannelMessageHandler for ChannelManager { //TODO: Handle errors and close channel (or so) - fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &msgs::OpenChannel) -> Result { + fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &msgs::OpenChannel) -> Result<(), HandleError> { handle_error!(self, self.internal_open_channel(their_node_id, msg), their_node_id) } @@ -2841,20 +2847,26 @@ mod tests { (announcement, as_update, bs_update, channel_id, tx) } + macro_rules! get_event_msg { + ($node: expr, $event_type: path, $node_id: expr) => { + { + let events = $node.node.get_and_clear_pending_msg_events(); + assert_eq!(events.len(), 1); + match events[0] { + $event_type { ref node_id, ref msg } => { + assert_eq!(*node_id, $node_id); + (*msg).clone() + }, + _ => panic!("Unexpected event"), + } + } + } + } + fn create_chan_between_nodes_with_value_init(node_a: &Node, node_b: &Node, channel_value: u64, push_msat: u64) -> Transaction { node_a.node.create_channel(node_b.node.get_our_node_id(), channel_value, push_msat, 42).unwrap(); - - let events_1 = node_a.node.get_and_clear_pending_msg_events(); - assert_eq!(events_1.len(), 1); - let accept_chan = match events_1[0] { - MessageSendEvent::SendOpenChannel { ref node_id, ref msg } => { - assert_eq!(*node_id, node_b.node.get_our_node_id()); - node_b.node.handle_open_channel(&node_a.node.get_our_node_id(), msg).unwrap() - }, - _ => panic!("Unexpected event"), - }; - - node_a.node.handle_accept_channel(&node_b.node.get_our_node_id(), &accept_chan).unwrap(); + node_b.node.handle_open_channel(&node_a.node.get_our_node_id(), &get_event_msg!(node_a, MessageSendEvent::SendOpenChannel, node_b.node.get_our_node_id())).unwrap(); + node_a.node.handle_accept_channel(&node_b.node.get_our_node_id(), &get_event_msg!(node_b, MessageSendEvent::SendAcceptChannel, node_a.node.get_our_node_id())).unwrap(); let chan_id = *node_a.network_chan_count.borrow(); let tx; diff --git a/src/ln/msgs.rs b/src/ln/msgs.rs index 29ff1a876..89c95b3b9 100644 --- a/src/ln/msgs.rs +++ b/src/ln/msgs.rs @@ -168,6 +168,7 @@ pub struct Pong { } /// An open_channel message to be sent or received from a peer +#[derive(Clone)] pub struct OpenChannel { pub(crate) chain_hash: Sha256dHash, pub(crate) temporary_channel_id: [u8; 32], @@ -191,6 +192,7 @@ pub struct OpenChannel { } /// An accept_channel message to be sent or received from a peer +#[derive(Clone)] pub struct AcceptChannel { pub(crate) temporary_channel_id: [u8; 32], pub(crate) dust_limit_satoshis: u64, @@ -524,7 +526,7 @@ pub enum RAACommitmentOrder { pub trait ChannelMessageHandler : events::MessageSendEventsProvider + Send + Sync { //Channel init: /// Handle an incoming open_channel message from the given peer. - fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &OpenChannel) -> Result; + fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &OpenChannel) -> Result<(), HandleError>; /// Handle an incoming accept_channel message from the given peer. fn handle_accept_channel(&self, their_node_id: &PublicKey, msg: &AcceptChannel) -> Result<(), HandleError>; /// Handle an incoming funding_created message from the given peer. diff --git a/src/ln/peer_handler.rs b/src/ln/peer_handler.rs index 631e48aa1..85a353a2e 100644 --- a/src/ln/peer_handler.rs +++ b/src/ln/peer_handler.rs @@ -559,8 +559,7 @@ impl PeerManager { // Channel control: 32 => { let msg = try_potential_decodeerror!(msgs::OpenChannel::read(&mut reader)); - let resp = try_potential_handleerror!(self.message_handler.chan_handler.handle_open_channel(&peer.their_node_id.unwrap(), &msg)); - encode_and_send_msg!(resp, 33); + try_potential_handleerror!(self.message_handler.chan_handler.handle_open_channel(&peer.their_node_id.unwrap(), &msg)); }, 33 => { let msg = try_potential_decodeerror!(msgs::AcceptChannel::read(&mut reader)); @@ -787,6 +786,16 @@ impl PeerManager { } } match event { + MessageSendEvent::SendAcceptChannel { ref node_id, ref msg } => { + log_trace!(self, "Handling SendAcceptChannel event in peer_handler for node {} for channel {}", + log_pubkey!(node_id), + log_bytes!(msg.temporary_channel_id)); + let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, { + //TODO: Drop the pending channel? (or just let it timeout, but that sucks) + }); + peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 33))); + Self::do_attempt_write_data(&mut descriptor, peer); + }, MessageSendEvent::SendOpenChannel { ref node_id, ref msg } => { log_trace!(self, "Handling SendOpenChannel event in peer_handler for node {} for channel {}", log_pubkey!(node_id), diff --git a/src/util/events.rs b/src/util/events.rs index 261ee57cc..ce6e5d99f 100644 --- a/src/util/events.rs +++ b/src/util/events.rs @@ -102,7 +102,15 @@ pub enum Event { /// broadcast to most peers). /// These events are handled by PeerManager::process_events if you are using a PeerManager. pub enum MessageSendEvent { - /// Used to indicate that we've initialted a channel open and should send the open_channel + /// Used to indicate that we've accepted a channel open and should send the accept_channel + /// message provided to the given peer. + SendAcceptChannel { + /// The node_id of the node which should receive this message + node_id: PublicKey, + /// The message which should be sent. + msg: msgs::AcceptChannel, + }, + /// Used to indicate that we've initiated a channel open and should send the open_channel /// message provided to the given peer. SendOpenChannel { /// The node_id of the node which should receive this message diff --git a/src/util/test_utils.rs b/src/util/test_utils.rs index 31a19776a..0795162e2 100644 --- a/src/util/test_utils.rs +++ b/src/util/test_utils.rs @@ -86,7 +86,7 @@ impl TestChannelMessageHandler { } impl msgs::ChannelMessageHandler for TestChannelMessageHandler { - fn handle_open_channel(&self, _their_node_id: &PublicKey, _msg: &msgs::OpenChannel) -> Result { + fn handle_open_channel(&self, _their_node_id: &PublicKey, _msg: &msgs::OpenChannel) -> Result<(), HandleError> { Err(HandleError { err: "", action: None }) } fn handle_accept_channel(&self, _their_node_id: &PublicKey, _msg: &msgs::AcceptChannel) -> Result<(), HandleError> { -- 2.39.5