If no Port is specified, set myport to actual port of first listening socket.

[oweals/tinc.git] / src / net_setup.c

diff --git a/src/net_setup.c b/src/net_setup.c
index e1d9f2759e8758e583aee0a30e852515e47e8f00..249724d31791c4bac6fbea13c8eb2e64399a736d 100644 (file)
--- a/src/net_setup.c
+++ b/src/net_setup.c
@@ -340,6 +340,7 @@ static bool setup_myself(void) {
        bool choice;
        int i, err;
        int replaywin_int;
+       bool port_specified = false;
 
        myself = new_node();
        myself->connection = new_connection();
@@ -355,6 +356,8 @@ static bool setup_myself(void) {
                return false;
        }
 
+       /* Read tinc.conf and our own host config file */
+
        myself->name = name;
        myself->connection->name = xstrdup(name);
        xasprintf(&fname, "%s/hosts/%s", confbase, name);
@@ -367,6 +370,10 @@ static bool setup_myself(void) {
 
        if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
                myport = xstrdup("655");
+       else
+               port_specified = true;
+
+       /* Ensure myport is numeric */
 
        if(!atoi(myport)) {
                struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
@@ -812,13 +819,27 @@ static bool setup_myself(void) {
                } while(cfg);
        }
 
-       if(listen_sockets)
-               logger(LOG_NOTICE, "Ready");
-       else {
+       if(!listen_sockets) {
                logger(LOG_ERR, "Unable to create any listening socket!");
                return false;
        }
 
+       /* If no Port option was specified, set myport to the port used by the first listening socket. */
+
+       if(!port_specified) {
+               sockaddr_t sa;
+               socklen_t salen = sizeof sa;
+               if(!getsockname(listen_socket[0].udp, &sa.sa, &salen)) {
+                       free(myport);
+                       sockaddr2str(&sa, NULL, &myport);
+                       if(!myport)
+                               myport = xstrdup("655");
+               }
+       }
+
+       /* Done. */
+
+       logger(LOG_NOTICE, "Ready");
        return true;
 }