gossip: Directly return an error if we don't know a node's address

Signed-off-by: Christian Decker <decker.christian@gmail.com>

gossipd/gossip.c

@@ -1573,9 +1573,10 @@ static void connect_failed(struct io_conn *conn, struct reaching *reach)
 		status_trace("Failed to connect after %d attempts, giving up "
 			     "after %d seconds",
 			     reach->attempts, diff);
-		daemon_conn_send(&reach->daemon->master,
-				 take(towire_gossip_peer_connection_failed(
-				     conn, &reach->id, diff, reach->attempts)));
+		daemon_conn_send(
+		    &reach->daemon->master,
+		    take(towire_gossip_peer_connection_failed(
+			conn, &reach->id, diff, reach->attempts, false)));
 		tal_free(reach);
 	} else {
 		status_trace("Failed connected out for %s, will try again",
@@ -1645,6 +1646,12 @@ static void try_connect(struct reaching *reach)
 		/* FIXME: add reach_failed message */
 		status_trace("No address known for %s, giving up",
 			     type_to_string(trc, struct pubkey, &reach->id));
+		daemon_conn_send(
+		    &reach->daemon->master,
+		    take(towire_gossip_peer_connection_failed(
+			reach, &reach->id,
+			time_now().ts.tv_sec - reach->first_attempt,
+			reach->attempts, true)));
 		tal_free(reach);
 		return;
 	}

gossipd/gossip_wire.csv

@@ -48,6 +48,7 @@ gossip_peer_connection_failed,3020
 gossip_peer_connection_failed,,id,struct pubkey
 gossip_peer_connection_failed,,timeout,u32
 gossip_peer_connection_failed,,attempts,u32
+gossip_peer_connection_failed,,addr_unknown,bool
 
 # Gossipd -> master: peer sent non-gossip packet. Two fds: peer and gossip
 gossip_peer_nongossip,3003

lightningd/peer_control.c

@@ -610,20 +610,32 @@ void peer_connection_failed(struct lightningd *ld, const u8 *msg)
 {
 	struct pubkey id;
 	u32 attempts, timediff;
-		struct connect *i, *next;
-	if (!fromwire_gossip_peer_connection_failed(msg, NULL, &id, &attempts, &timediff))
-		fatal("Gossip gave bad GOSSIP_PEER_CONNECTION_FAILED message %s", tal_hex(msg, msg));
+	struct connect *i, *next;
+	bool addr_unknown;
+	char *error;
+
+	if (!fromwire_gossip_peer_connection_failed(msg, NULL, &id, &attempts,
+						    &timediff, &addr_unknown))
+		fatal(
+		    "Gossip gave bad GOSSIP_PEER_CONNECTION_FAILED message %s",
+		    tal_hex(msg, msg));
+
+	if (addr_unknown) {
+		error = tal_fmt(
+		    msg, "No address known for node %s, please provide one",
+		    type_to_string(msg, struct pubkey, &id));
+	} else {
+		error = tal_fmt(msg, "Could not connect to %s after %d seconds and %d attempts",
+				type_to_string(msg, struct pubkey, &id), timediff,
+				attempts);
+	}
 
 	/* Careful!  Completing command frees connect. */
 	list_for_each_safe(&ld->connects, i, next, list) {
 		if (!pubkey_eq(&i->id, &id))
 			continue;
 
-		command_fail(
-		    i->cmd,
-		    "Could not connect to %s after %d seconds and %d attempts",
-		    type_to_string(msg, struct pubkey, &id), timediff,
-		    attempts);
+		command_fail(i->cmd, "%s", error);
 	}
 }