getinfo: new RPC command

Useful for getting ID, what port (if not set in config file).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

daemon/jsonrpc.c

@@ -255,6 +255,28 @@ static const struct json_command dev_restart_command = {
 	"Simple restart test for developers"
 };
 
+static void json_getinfo(struct command *cmd,
+			 const char *buffer, const jsmntok_t *params)
+{
+	struct json_result *response = new_json_result(cmd);
+
+	json_object_start(response, NULL);
+	json_add_pubkey(response, cmd->dstate->secpctx, "id", &cmd->dstate->id);
+	/* FIXME: Keep netaddrs and list them all. */
+	if (cmd->dstate->portnum)
+		json_add_num(response, "port", cmd->dstate->portnum);
+	json_add_bool(response, "testnet", cmd->dstate->config.testnet);
+	json_object_end(response);
+	command_success(cmd, response);
+}
+
+static const struct json_command getinfo_command = {
+	"getinfo",
+	json_getinfo,
+	"Get general information about this node",
+	"Returns {id}, {port}, {testnet}, etc."
+};
+
 static const struct json_command *cmdlist[] = {
 	&help_command,
 	&stop_command,

daemon/lightningd.c

@@ -254,6 +254,7 @@ static struct lightningd_state *lightningd_state(void)
 
 	list_head_init(&dstate->peers);
 	list_head_init(&dstate->pay_commands);
+	dstate->portnum = 0;
 	timers_init(&dstate->timers, controlled_time());
 	txwatch_hash_init(&dstate->txwatches);
 	txowatch_hash_init(&dstate->txowatches);

daemon/lightningd.h

@@ -72,6 +72,9 @@ struct lightningd_state {
 	char *config_dir;
 	char *rpc_filename;
 
+	/* Port we're listening on */
+	u16 portnum;
+	
 	/* Configuration settings. */
 	struct config config;
 

daemon/peer.c

@@ -2745,7 +2745,6 @@ void setup_listeners(struct lightningd_state *dstate, unsigned int portnum)
 	struct sockaddr_in6 addr6;
 	socklen_t len;
 	int fd1, fd2;
-	u16 listen_port;
 
 	memset(&addr, 0, sizeof(addr));
 	addr.sin_family = AF_INET;
@@ -2771,10 +2770,10 @@ void setup_listeners(struct lightningd_state *dstate, unsigned int portnum)
 			close_noerr(fd1);
 		} else {
 			addr.sin_port = in6.sin6_port;
-			listen_port = ntohs(addr.sin_port);
+			dstate->portnum = ntohs(addr.sin_port);
 			log_info(dstate->base_log,
 				 "Creating IPv6 listener on port %u",
-				 listen_port);
+				 dstate->portnum);
 			io_new_listener(dstate, fd1, peer_connected_in, dstate);
 		}
 	}
@@ -2790,10 +2789,10 @@ void setup_listeners(struct lightningd_state *dstate, unsigned int portnum)
 				    strerror(errno));
 			close_noerr(fd2);
 		} else {
-			listen_port = ntohs(addr.sin_port);
+			dstate->portnum = ntohs(addr.sin_port);
 			log_info(dstate->base_log,
 				 "Creating IPv4 listener on port %u",
-				 listen_port);
+				 dstate->portnum);
 			io_new_listener(dstate, fd2, peer_connected_in, dstate);
 		}
 	}