From: Matt Corallo <git@bluematt.me>
Date: Mon, 21 Jun 2021 17:36:46 +0000 (+0000)
Subject: Do not generate error messages when we receive our own gossip
X-Git-Tag: v0.0.99~12^2~10
X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=commitdiff_plain;h=a146ef2be28d9f4e4daeb8f88797115931824578;p=rust-lightning

Do not generate error messages when we receive our own gossip

When a peer sends us the routing graph, it may include gossip
messages for our channels, despite it not being a party to them.
This is completely fine, but we currently print a somewhat-scary
looking log messages in these cases, eg:

```
ERROR [lightning::ln::channelmanager:4104] Got a message for a channel from the wrong node!
TRACE [lightning::ln::peer_handler:1267] Handling SendErrorMessage HandleError event in peer_handler for node ... with message Got a message for a channel from the wrong node!
```

Instead, we should simply not consider this an "error" condition
and stay silent.
---

diff --git a/lightning/src/ln/channelmanager.rs b/lightning/src/ln/channelmanager.rs
index ee266849b..81fb4561f 100644
--- a/lightning/src/ln/channelmanager.rs
+++ b/lightning/src/ln/channelmanager.rs
@@ -3354,8 +3354,13 @@ impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelMana
 		match channel_state.by_id.entry(chan_id) {
 			hash_map::Entry::Occupied(mut chan) => {
 				if chan.get().get_counterparty_node_id() != *counterparty_node_id {
-					// TODO: see issue #153, need a consistent behavior on obnoxious behavior from random node
-					return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!".to_owned(), chan_id));
+					if chan.get().should_announce() {
+						// If the announcement is about a channel of ours which is public, some
+						// other peer may simply be forwarding all its gossip to us. Don't provide
+						// a scary-looking error message and return Ok instead.
+						return Ok(());
+					}
+					return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a channel_update for a channel from the wrong node - it shouldn't know about our private channels!".to_owned(), chan_id));
 				}
 				try_chan_entry!(self, chan.get_mut().channel_update(&msg), channel_state, chan);
 			},