Choose tunnel device name

iodine.c

@@ -164,7 +164,7 @@ extern char *__progname;
 
 static void
 usage() {
-	printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] "
+	printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] [-d device]"
 			"nameserver topdomain\n", __progname);
 	exit(2);
 }
@@ -172,13 +172,14 @@ usage() {
 static void
 help() {
 	printf("iodine IP over DNS tunneling client\n");
-	printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] "
+	printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] [-d device]"
 			"nameserver topdomain\n", __progname);
 	printf("  -v to print version info and exit\n");
 	printf("  -h to print this help and exit\n");
 	printf("  -f to keep running in foreground\n");
 	printf("  -u name to drop privileges and run as user 'name'\n");
 	printf("  -t dir to chroot to directory dir\n");
+	printf("  -d device to set tunnel device name\n");
 	printf("nameserver is the IP number of the relaying nameserver\n");
 	printf("topdomain is the FQDN that is delegated to the tunnel endpoint.\n");
 	exit(0);
@@ -198,14 +199,16 @@ main(int argc, char **argv)
 	int choice;
 	char *newroot;
 	char *username;
+	char *device;
 	int foreground;
 	struct passwd *pw;
 
 	newroot = NULL;
 	username = NULL;
+	device = NULL;
 	foreground = 0;
 	
-	while ((choice = getopt(argc, argv, "vfhu:t:")) != -1) {
+	while ((choice = getopt(argc, argv, "vfhu:t:d:")) != -1) {
 		switch(choice) {
 		case 'v':
 			version();
@@ -222,6 +225,9 @@ main(int argc, char **argv)
 		case 't':
 			newroot = optarg;
 			break;
+		case 'd':
+			device = optarg;
+			break;
 		default:
 			usage();
 			break;
@@ -247,7 +253,7 @@ main(int argc, char **argv)
 		}
 	}
 
-	if ((tun_fd = open_tun(NULL)) == -1)
+	if ((tun_fd = open_tun(device)) == -1)
 		goto cleanup1;
 	if ((dns_fd = open_dns(argv[1], 0)) == -1)
 		goto cleanup2;

iodined.c

@@ -163,7 +163,7 @@ extern char *__progname;
 
 static void
 usage() {
-	printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] [-m mtu] "
+	printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] [-d device] [-m mtu] "
 			"tunnel_ip topdomain\n", __progname);
 	exit(2);
 }
@@ -171,13 +171,15 @@ usage() {
 static void
 help() {
 	printf("iodine IP over DNS tunneling server\n");
-	printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] [-m mtu] "
+	printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] [-d device] [-m mtu] "
 		   "tunnel_ip topdomain\n", __progname);
 	printf("  -v to print version info and exit\n");
 	printf("  -h to print this help and exit\n");
 	printf("  -f to keep running in foreground\n");
 	printf("  -u name to drop privileges and run as user 'name'\n");
 	printf("  -t dir to chroot to directory dir\n");
+	printf("  -d device to set tunnel device name\n");
+	printf("  -m mtu to set tunnel device mtu\n");
 	printf("tunnel_ip is the IP number of the local tunnel interface.\n");
 	printf("topdomain is the FQDN that is delegated to this server.\n");
 	exit(0);
@@ -199,12 +201,14 @@ main(int argc, char **argv)
 	int dnsd_fd;
 	char *newroot;
 	char *username;
+	char *device;
 	int foreground;
 	int mtu;
 	struct passwd *pw;
 
 	username = NULL;
 	newroot = NULL;
+	device = NULL;
 	foreground = 0;
 	mtu = 1024;
 
@@ -213,7 +217,7 @@ main(int argc, char **argv)
 	outpacket.len = 0;
 	q.id = 0;
 	
-	while ((choice = getopt(argc, argv, "vfhu:t:m:")) != -1) {
+	while ((choice = getopt(argc, argv, "vfhu:t:d:m:")) != -1) {
 		switch(choice) {
 		case 'v':
 			version();
@@ -230,6 +234,9 @@ main(int argc, char **argv)
 		case 't':
 			newroot = optarg;
 			break;
+		case 'd':
+			device = optarg;
+			break;
 		case 'm':
 			mtu = atoi(optarg);
 			break;
@@ -263,7 +270,7 @@ main(int argc, char **argv)
 		usage();
 	}
 
-	if ((tun_fd = open_tun(NULL)) == -1)
+	if ((tun_fd = open_tun(device)) == -1)
 		goto cleanup0;
 	if (tun_setip(argv[0]) != 0 || tun_setmtu(mtu) != 0)
 		goto cleanup1;

tun.c

@@ -58,10 +58,10 @@ open_tun(const char *tun_device)
 
 	if (tun_device != NULL) {
 			strncpy(ifreq.ifr_name, tun_device, IFNAMSIZ);
+			strncpy(if_name, tun_device, sizeof(if_name));
 
 			if (ioctl(tun_fd, TUNSETIFF, (void *) &ifreq) != -1) {
 				printf("Opened %s\n", ifreq.ifr_name);
-				snprintf(if_name, sizeof(if_name), "dns%d", i);
 				return tun_fd;
 			}