Correctly handle sending announcement sigs on public 0conf channels

lightning/src/ln/channel.rs

@@ -4576,12 +4576,11 @@ impl<Signer: Sign> Channel<Signer> {
 	pub fn transactions_confirmed<L: Deref>(&mut self, block_hash: &BlockHash, height: u32,
 		txdata: &TransactionData, genesis_block_hash: BlockHash, node_pk: PublicKey, logger: &L)
 	-> Result<(Option<msgs::FundingLocked>, Option<msgs::AnnouncementSignatures>), ClosureReason> where L::Target: Logger {
-		let non_shutdown_state = self.channel_state & (!MULTI_STATE_FLAGS);
 		if let Some(funding_txo) = self.get_funding_txo() {
 			for &(index_in_block, tx) in txdata.iter() {
 				// If we haven't yet sent a funding_locked, but are in FundingSent (ignoring
 				// whether they've sent a funding_locked or not), check if we should send one.
-				if non_shutdown_state & !(ChannelState::TheirFundingLocked as u32) == ChannelState::FundingSent as u32 {
+				if self.funding_tx_confirmation_height == 0 {
 					if tx.txid() == funding_txo.txid {
 						let txo_idx = funding_txo.index as usize;
 						if txo_idx >= tx.output.len() || tx.output[txo_idx].script_pubkey != self.get_funding_redeemscript().to_v0_p2wsh() ||

lightning/src/ln/functional_tests.rs

@@ -9052,7 +9052,9 @@ fn test_duplicate_chan_id() {
 
 	let funding_created = {
 		let mut a_channel_lock = nodes[0].node.channel_state.lock().unwrap();
-		let mut as_chan = a_channel_lock.by_id.get_mut(&open_chan_2_msg.temporary_channel_id).unwrap();
+		// Note that we drop the channel entirely here as its in a somewhat nonsense state (leaving
+		// the channelmanager in a possibly nonsense state instead).
+		let mut as_chan = a_channel_lock.by_id.remove(&open_chan_2_msg.temporary_channel_id).unwrap();
 		let logger = test_utils::TestLogger::new();
 		as_chan.get_outbound_funding_created(tx.clone(), funding_outpoint, &&logger).unwrap()
 	};
@@ -9090,7 +9092,7 @@ fn test_duplicate_chan_id() {
 	let events_4 = nodes[0].node.get_and_clear_pending_events();
 	assert_eq!(events_4.len(), 0);
 	assert_eq!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().len(), 1);
-	assert_eq!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap()[0].txid(), funding_output.txid);
+	assert_eq!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap()[0], tx);
 
 	let (funding_locked, _) = create_chan_between_nodes_with_value_confirm(&nodes[0], &nodes[1], &tx);
 	let (announcement, as_update, bs_update) = create_chan_between_nodes_with_value_b(&nodes[0], &nodes[1], &funding_locked);

lightning/src/ln/priv_short_conf_tests.rs

@@ -767,3 +767,109 @@ fn test_0_conf_channel_with_async_monitor() {
 
 	send_payment(&nodes[0], &[&nodes[1]], 100_000);
 }
+
+#[test]
+fn test_public_0_conf_channel() {
+	// Tests that we will announce a public channel (after confirmation) even if its 0conf.
+	let chanmon_cfgs = create_chanmon_cfgs(2);
+	let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
+	let mut chan_config = test_default_channel_config();
+	chan_config.manually_accept_inbound_channels = true;
+	chan_config.channel_options.announced_channel = true;
+
+	let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, Some(chan_config)]);
+	let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
+
+	nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), 100000, 10001, 42, None).unwrap();
+	let open_channel = get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id());
+
+	nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), InitFeatures::known(), &open_channel);
+	let events = nodes[1].node.get_and_clear_pending_events();
+	assert_eq!(events.len(), 1);
+	match events[0] {
+		Event::OpenChannelRequest { temporary_channel_id, .. } => {
+			nodes[1].node.accept_inbound_channel_from_trusted_peer_0conf(&temporary_channel_id, 0).unwrap();
+		},
+		_ => panic!("Unexpected event"),
+	};
+
+	let mut accept_channel = get_event_msg!(nodes[1], MessageSendEvent::SendAcceptChannel, nodes[0].node.get_our_node_id());
+	assert_eq!(accept_channel.minimum_depth, 0);
+	nodes[0].node.handle_accept_channel(&nodes[1].node.get_our_node_id(), InitFeatures::known(), &accept_channel);
+
+	let (temporary_channel_id, tx, _) = create_funding_transaction(&nodes[0], 100000, 42);
+	nodes[0].node.funding_transaction_generated(&temporary_channel_id, tx.clone()).unwrap();
+	let funding_created = get_event_msg!(nodes[0], MessageSendEvent::SendFundingCreated, nodes[1].node.get_our_node_id());
+
+	nodes[1].node.handle_funding_created(&nodes[0].node.get_our_node_id(), &funding_created);
+	check_added_monitors!(nodes[1], 1);
+	let bs_signed_locked = nodes[1].node.get_and_clear_pending_msg_events();
+	assert_eq!(bs_signed_locked.len(), 2);
+	let as_funding_locked;
+	match &bs_signed_locked[0] {
+		MessageSendEvent::SendFundingSigned { node_id, msg } => {
+			assert_eq!(*node_id, nodes[0].node.get_our_node_id());
+			nodes[0].node.handle_funding_signed(&nodes[1].node.get_our_node_id(), &msg);
+			check_added_monitors!(nodes[0], 1);
+
+			assert_eq!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().len(), 1);
+			assert_eq!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().split_off(0)[0], tx);
+
+			as_funding_locked = get_event_msg!(nodes[0], MessageSendEvent::SendFundingLocked, nodes[1].node.get_our_node_id());
+		}
+		_ => panic!("Unexpected event"),
+	}
+	match &bs_signed_locked[1] {
+		MessageSendEvent::SendFundingLocked { node_id, msg } => {
+			assert_eq!(*node_id, nodes[0].node.get_our_node_id());
+			nodes[0].node.handle_funding_locked(&nodes[1].node.get_our_node_id(), &msg);
+		}
+		_ => panic!("Unexpected event"),
+	}
+
+	nodes[1].node.handle_funding_locked(&nodes[0].node.get_our_node_id(), &as_funding_locked);
+
+	let as_channel_update = get_event_msg!(nodes[0], MessageSendEvent::SendChannelUpdate, nodes[1].node.get_our_node_id());
+	let bs_channel_update = get_event_msg!(nodes[1], MessageSendEvent::SendChannelUpdate, nodes[0].node.get_our_node_id());
+
+	nodes[0].node.handle_channel_update(&nodes[1].node.get_our_node_id(), &bs_channel_update);
+	nodes[1].node.handle_channel_update(&nodes[0].node.get_our_node_id(), &as_channel_update);
+
+	assert_eq!(nodes[0].node.list_usable_channels().len(), 1);
+	assert_eq!(nodes[1].node.list_usable_channels().len(), 1);
+
+	// We can use the channel immediately, but we can't announce it until we get 6+ confirmations
+	send_payment(&nodes[0], &[&nodes[1]], 100_000);
+
+	confirm_transaction(&nodes[0], &tx);
+	let as_announcement_sigs = get_event_msg!(nodes[0], MessageSendEvent::SendAnnouncementSignatures, nodes[1].node.get_our_node_id());
+	confirm_transaction(&nodes[1], &tx);
+	let bs_announcement_sigs = get_event_msg!(nodes[1], MessageSendEvent::SendAnnouncementSignatures, nodes[0].node.get_our_node_id());
+
+	nodes[1].node.handle_announcement_signatures(&nodes[0].node.get_our_node_id(), &as_announcement_sigs);
+	nodes[0].node.handle_announcement_signatures(&nodes[1].node.get_our_node_id(), &bs_announcement_sigs);
+
+	let bs_announcement = nodes[1].node.get_and_clear_pending_msg_events();
+	assert_eq!(bs_announcement.len(), 1);
+	let announcement;
+	let bs_update;
+	match bs_announcement[0] {
+		MessageSendEvent::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
+			announcement = msg.clone();
+			bs_update = update_msg.clone();
+		},
+		_ => panic!("Unexpected event"),
+	};
+
+	let as_announcement = nodes[0].node.get_and_clear_pending_msg_events();
+	assert_eq!(as_announcement.len(), 1);
+	match as_announcement[0] {
+		MessageSendEvent::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
+			assert!(announcement == *msg);
+			assert_eq!(update_msg.contents.short_channel_id, announcement.contents.short_channel_id);
+			assert_eq!(update_msg.contents.short_channel_id, bs_update.contents.short_channel_id);
+		},
+		_ => panic!("Unexpected event"),
+	};
+
+}