v6 first pass

src/client.c

@@ -1374,7 +1374,7 @@ handshake_version(int dns_fd, int *seed)
 }
 
 static int
-handshake_login(int dns_fd, int seed)
+handshake_login(int dns_fd, int seed, int forward_v6)
 {
 	char in[4096];
 	char login[16];
@@ -1405,7 +1405,7 @@ handshake_login(int dns_fd, int seed)
 
 				server[64] = 0;
 				client[64] = 0;
-				if (tun_setip(client, server, netmask) == 0 &&
+				if (tun_setip(client, server, netmask, forward_v6) == 0 &&
 					tun_setmtu(mtu) == 0) {
 
 					fprintf(stderr, "Server tunnel IP is %s\n", server);
@@ -2326,7 +2326,7 @@ handshake_set_fragsize(int dns_fd, int fragsize)
 }
 
 int
-client_handshake(int dns_fd, int raw_mode, int autodetect_frag_size, int fragsize)
+client_handshake(int dns_fd, int raw_mode, int autodetect_frag_size, int fragsize, int forward_v6)
 {
 	int seed;
 	int upcodec;
@@ -2349,7 +2349,7 @@ client_handshake(int dns_fd, int raw_mode, int autodetect_frag_size, int fragsiz
 		return r;
 	}
 
-	r = handshake_login(dns_fd, seed);
+	r = handshake_login(dns_fd, seed, forward_v6);
 	if (r) {
 		return r;
 	}

src/client.h

@@ -35,7 +35,7 @@ void client_set_lazymode(int lazy_mode);
 void client_set_hostname_maxlen(int i);
 
 int client_handshake(int dns_fd, int raw_mode, int autodetect_frag_size,
-		     int fragsize);
+		     int fragsize, int forward_v6);
 int client_tunnel(int tun_fd, int dns_fd);
 
 #endif

src/iodine.c

@@ -72,7 +72,7 @@ static void help(FILE *stream, bool verbose)
 {
 	fprintf(stream,
 		"iodine IP over DNS tunneling client\n\n"
-		"Usage: %s [-46fhrv] [-u user] [-t chrootdir] [-d device] [-P password]\n"
+		"Usage: %s [-46fhrvS] [-u user] [-t chrootdir] [-d device] [-P password]\n"
 		"              [-m maxfragsize] [-M maxlen] [-T type] [-O enc] [-L 0|1] [-I sec]\n"
 		"              [-z context] [-F pidfile] [nameserver] topdomain\n", __progname);
 
@@ -100,6 +100,7 @@ static void help(FILE *stream, bool verbose)
 		"  -t dir to chroot to directory dir\n"
 		"  -d device to set tunnel device name\n"
 		"  -z context, to apply specified SELinux context after initialization\n"
+                "  -S enable forwarding of IPv6 packets within the tunnel\n"
 		"  -F pidfile to write pid to a file\n\n"
 		"nameserver is the IP number/hostname of the relaying nameserver. If absent,\n"
 		"           /etc/resolv.conf is used\n"
@@ -152,6 +153,7 @@ int main(int argc, char **argv)
 	struct sockaddr_storage nameservaddr;
 	int nameservaddr_len;
 	int nameserv_family;
+        int forward_v6;
 
 	nameserv_host = NULL;
 	topdomain = NULL;
@@ -176,6 +178,7 @@ int main(int argc, char **argv)
 	selecttimeout = 4;
 	hostname_maxlen = 0xFF;
 	nameserv_family = AF_UNSPEC;
+        forward_v6 = 0;
 
 #ifdef WINDOWS32
 	WSAStartup(req_version, &wsa_data);
@@ -192,7 +195,7 @@ int main(int argc, char **argv)
 		__progname++;
 #endif
 
-	while ((choice = getopt(argc, argv, "46vfhru:t:d:R:P:m:M:F:T:O:L:I:")) != -1) {
+	while ((choice = getopt(argc, argv, "46vfhru:t:d:R:P:m:M:F:T:O:L:I:s")) != -1) {
 		switch(choice) {
 		case '4':
 			nameserv_family = AF_INET;
@@ -268,6 +271,9 @@ int main(int argc, char **argv)
 			if (!lazymode)
 				selecttimeout = 1;
 			break;
+                case 'S':
+                        forward_v6 = 1;
+                        break; 
 		case 'I':
 			selecttimeout = atoi(optarg);
 			if (selecttimeout < 1)

src/iodined.c

@@ -2274,7 +2274,7 @@ write_dns(int fd, struct query *q, const char *data, int datalen, char downenc)
 static void print_usage(FILE *stream)
 {
 	fprintf(stream,
-		"Usage: %s [-46cDfsv] [-u user] [-t chrootdir] [-d device] [-m mtu]\n"
+		"Usage: %s [-46cDfsvS] [-u user] [-t chrootdir] [-d device] [-m mtu]\n"
 		"               [-z context] [-l ipv4 listen address] [-L ipv6 listen address]\n"
 		"               [-p port] [-n auto|external_ip] [-b dnsport] [-P password]\n"
 		"               [-F pidfile] [-i max idle time] tunnel_ip[/netmask] topdomain\n",
@@ -2390,6 +2390,7 @@ main(int argc, char **argv)
 	int dns4addr_len;
 	struct sockaddr_storage dns6addr;
 	int dns6addr_len;
+        int forward_v6;
 #ifdef HAVE_SYSTEMD
 	int nb_fds;
 #endif
@@ -2418,7 +2419,7 @@ main(int argc, char **argv)
 	debug = 0;
 	netmask = 27;
 	pidfile = NULL;
-
+        forward_v6 = 0;
 	retval = 0;
 
 #ifdef WINDOWS32
@@ -2507,6 +2508,9 @@ main(int argc, char **argv)
 			/* XXX: find better way of cleaning up ps(1) */
 			memset(optarg, 0, strlen(optarg));
 			break;
+                case 'S':
+                        forward_v6 = 1;
+                        break;
 		case 'z':
 			context = optarg;
 			break;
@@ -2674,7 +2678,7 @@ main(int argc, char **argv)
 	}
 	if (!skipipconfig) {
 		const char *other_ip = users_get_first_ip();
-		if (tun_setip(argv[0], other_ip, netmask) != 0 || tun_setmtu(mtu) != 0) {
+		if (tun_setip(argv[0], other_ip, netmask, forward_v6) != 0 || tun_setmtu(mtu) != 0) {
 			retval = 1;
 			free((void*) other_ip);
 			goto cleanup;

src/tun.c

@@ -592,7 +592,7 @@ read_tun(int tun_fd, char *buf, size_t len)
 #endif
 
 int
-tun_setip(const char *ip, const char *other_ip, int netbits)
+tun_setip(const char *ip, const char *other_ip, int netbits, int forward_v6)
 {
 	char cmdline[512];
 	int netmask;
@@ -687,6 +687,15 @@ tun_setip(const char *ip, const char *other_ip, int netbits)
 		if_name, ip, inet_ntoa(net));
 	return system(cmdline);
 #endif
+
+        if (forward_v6) {
+                snprintf(cmdline, sizeof(cmdline),
+                    IFCONFIGPATH "ifconfig %s inet6 add ::%s/64",
+                    if_name,
+                    ip);
+
+        fprintf(stderr, "Setting IP of %s to %s\n", if_name, ip);        
+        }
 }
 
 int

src/tun.h

@@ -22,7 +22,7 @@ int open_tun(const char *);
 void close_tun(int);
 int write_tun(int, char *, size_t);
 ssize_t read_tun(int, char *, size_t);
-int tun_setip(const char *, const char *, int);
+int tun_setip(const char *, const char *, int, int);
 int tun_setmtu(const unsigned);
 
 #endif /* _TUN_H_ */