Stop client if server is restarted

CHANGELOG

@@ -18,6 +18,7 @@ CHANGES:
 		from Francois Revol. Still work to do to get tun device working.
 	- Added capability to forward DNS queries outside tunnel domain to
 		a nameserver on localhost. Use -b port to enable.
+	- iodine client now shuts down if it detects a server restart.
 
 2008-08-06: 0.4.2 "Opened Zone"
 	- Applied a few small patches from Maxim Bourmistrov and Gregor Herrmann

src/iodine.c

@@ -226,6 +226,12 @@ tunnel_dns(int tun_fd, int dns_fd)
 	if ((read = read_dns(dns_fd, in, sizeof(in))) <= 0) 
 		return -1;
 		
+	if (read == 5 && strncmp("BADIP", in, 5) == 0) {
+		errx(3, "Not recognized by server. "
+			"Has it been restarted? Aborting");
+		/* NOTREACHED */
+	}
+
 	outlen = sizeof(out);
 	inlen = read;
 	if (uncompress((uint8_t*)out, &outlen, (uint8_t*)in, inlen) != Z_OK)