Add duplicate temporary_channel_id for 2 peers test

diff --git a/lightning/src/ln/functional_tests.rs b/lightning/src/ln/functional_tests.rs
index 277e4adfbfca24a50fcec16d5c4bed1f68c9c0e5..c3174b3931520dc738472d04900825d0d044d278 100644 (file)
--- a/lightning/src/ln/functional_tests.rs
+++ b/lightning/src/ln/functional_tests.rs
@@ -8511,6 +8511,56 @@ fn test_onchain_htlc_settlement_after_close() {
        do_test_onchain_htlc_settlement_after_close(false, false);
 }
 
+#[test]
+fn test_duplicate_temporary_channel_id_from_different_peers() {
+       // Tests that we can accept two different `OpenChannel` requests with the same
+       // `temporary_channel_id`, as long as they are from different peers.
+       let chanmon_cfgs = create_chanmon_cfgs(3);
+       let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
+       let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
+       let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
+
+       // Create an first channel channel
+       nodes[1].node.create_channel(nodes[0].node.get_our_node_id(), 100000, 10001, 42, None).unwrap();
+       let mut open_chan_msg_chan_1_0 = get_event_msg!(nodes[1], MessageSendEvent::SendOpenChannel, nodes[0].node.get_our_node_id());
+
+       // Create an second channel
+       nodes[2].node.create_channel(nodes[0].node.get_our_node_id(), 100000, 10001, 43, None).unwrap();
+       let mut open_chan_msg_chan_2_0 = get_event_msg!(nodes[2], MessageSendEvent::SendOpenChannel, nodes[0].node.get_our_node_id());
+
+       // Modify the `OpenChannel` from `nodes[2]` to `nodes[0]` to ensure that it uses the same
+       // `temporary_channel_id` as the `OpenChannel` from nodes[1] to nodes[0].
+       open_chan_msg_chan_2_0.temporary_channel_id = open_chan_msg_chan_1_0.temporary_channel_id;
+
+       // Assert that `nodes[0]` can accept both `OpenChannel` requests, even though they use the same
+       // `temporary_channel_id` as they are from different peers.
+       nodes[0].node.handle_open_channel(&nodes[1].node.get_our_node_id(), channelmanager::provided_init_features(), &open_chan_msg_chan_1_0);
+       {
+               let events = nodes[0].node.get_and_clear_pending_msg_events();
+               assert_eq!(events.len(), 1);
+               match &events[0] {
+                       MessageSendEvent::SendAcceptChannel { node_id, msg } => {
+                               assert_eq!(node_id, &nodes[1].node.get_our_node_id());
+                               assert_eq!(msg.temporary_channel_id, open_chan_msg_chan_1_0.temporary_channel_id);
+                       },
+                       _ => panic!("Unexpected event"),
+               }
+       }
+
+       nodes[0].node.handle_open_channel(&nodes[2].node.get_our_node_id(), channelmanager::provided_init_features(), &open_chan_msg_chan_2_0);
+       {
+               let events = nodes[0].node.get_and_clear_pending_msg_events();
+               assert_eq!(events.len(), 1);
+               match &events[0] {
+                       MessageSendEvent::SendAcceptChannel { node_id, msg } => {
+                               assert_eq!(node_id, &nodes[2].node.get_our_node_id());
+                               assert_eq!(msg.temporary_channel_id, open_chan_msg_chan_1_0.temporary_channel_id);
+                       },
+                       _ => panic!("Unexpected event"),
+               }
+       }
+}
+
 #[test]
 fn test_duplicate_chan_id() {
        // Test that if a given peer tries to open a channel with the same channel_id as one that is