relocated 'detect_local_ip_address()' (#792)

src/n2n.c

@@ -61,53 +61,6 @@ SOCKET open_socket (int local_port, in_addr_t address, int type /* 0 = UDP, TCP
 }
 
 
-int detect_local_ip_address (n2n_sock_t* out_sock, const n2n_edge_t* eee) {
-
-    struct sockaddr_in local_sock;
-    struct sockaddr_in sn_sock;
-    socklen_t sock_len = sizeof(local_sock);
-    SOCKET probe_sock;
-
-    out_sock->family = AF_INVALID;
-
-
-    // always detetct local port even/especially if chosen by OS...
-    if((getsockname(eee->sock, (struct sockaddr *)&local_sock, &sock_len) == 0)
-    && (local_sock.sin_family == AF_INET)
-    && (sock_len == sizeof(local_sock)))
-        // remember the port number
-        out_sock->port = ntohs(local_sock.sin_port);
-    else
-        return -1;
-
-    // probe for local IP address
-    probe_sock = socket(PF_INET, SOCK_DGRAM, 0);
-    // connecting the UDP socket makes getsockname read the local address it uses to connect (to the sn in this case);
-    // we cannot do it with the real (eee->sock) socket because socket does not accept any conenction from elsewhere then,
-    // e.g. from another edge instead of the supernode; as re-connecting to AF_UNSPEC might not work to release the socket
-    // on non-UNIXoids, we use a temporary socket
-    if((int)probe_sock >= 0) {
-        fill_sockaddr((struct sockaddr*)&sn_sock, sizeof(sn_sock), &eee->curr_sn->sock);
-        if(connect(probe_sock, (struct sockaddr *)&sn_sock, sizeof(sn_sock)) == 0) {
-            if((getsockname(probe_sock, (struct sockaddr *)&local_sock, &sock_len) == 0)
-            && (local_sock.sin_family == AF_INET)
-            && (sock_len == sizeof(local_sock))) {
-                memcpy(&(out_sock->addr.v4), &(local_sock.sin_addr.s_addr), IPV4_SIZE);
-            } else
-                return -4;
-        } else
-            return -3;
-        closesocket(probe_sock);
-    } else
-        return -2;
-
-    out_sock->family = AF_INET;
-
-    return 0;
-}
-
-
-
 static int traceLevel = 2 /* NORMAL */;
 static int useSyslog = 0, syslog_opened = 0;
 static FILE *traceFile = NULL;