Attempts to re-bind the UDP port with port 0 if a re-bind w/server port fails.

src/sbbs3/services.c

@@ -1306,12 +1306,15 @@ void DLLCALL services_thread(void* arg)
 					addr.sin_family = AF_INET;
 					addr.sin_port   = htons(service[i].port);
 
-					if(startup->seteuid!=NULL && !startup->seteuid(FALSE))
-						addr.sin_port=0;
-
 					result=bind(client_socket, (struct sockaddr *) &addr, sizeof(addr));
-					if(startup->seteuid!=NULL)
-						startup->seteuid(TRUE);
+					if(result==SOCKET_ERROR) {
+						/* Failed to re-bind to same port number, use user port */
+						lprintf("%04d %s ERROR %d re-binding socket to port %u failed, "
+							"using user port"
+							,client_socket, service[i].protocol, ERROR_VALUE, service[i].port);
+						addr.sin_port=0;
+						result=bind(client_socket, (struct sockaddr *) &addr, sizeof(addr));
+					}
 					if(result!=0) {
 						FREE_AND_NULL(udp_buf);
 						lprintf("%04d %s !ERROR %d re-binding socket to port %u"