[BUG: #62] time-unix/unix-socket: bind socket to the interface

Signed-off-by: Adam Wujek <dev_public@wujek.eu>

time-unix/unix-socket.c

@@ -477,6 +477,13 @@ static int unix_open_ch_udp(struct pp_instance *ppi, char *ifname, int chtype)
 		       &temp, sizeof(int)) < 0)
 		goto err_out;
 
+	/* Bind socket to a specific interface, otherwise a socket gets messages
+	 * from all interfaces */
+	context = "setsockopt(SO_BINDTODEVICE)";
+	if (setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE,
+		       (void *)&ifr, sizeof(ifr)) < 0)
+		goto err_out;
+
 	ppi->ch[chtype].fd = sock;
 	return 0;