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Add tip from Tom, add port selection on iodined

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This commit is contained in:
Erik Ekman 2006-11-05 13:18:57 +00:00
parent 20c8aa56db
commit 125f6c82e6
3 changed files with 20 additions and 5 deletions
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2
CHANGELOG
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@ -7,7 +7,7 @@ iodine - IP over DNS is now easy
CHANGES:
2006-11-06: 0.3.3
2006-11-05: 0.3.3
- Fixed possible buffer overflow
(Found by poplix)
- Reworked dns hostname encoding

9
README
View file

@ -73,6 +73,15 @@ can be max 63 chars. So your domain name and subdomain should be as short as
possible to allow maximum throughput.
TIPS & TRICKS:
If your port 53 is taken on a specific interface by an application that does
not use it, use -p on iodined to specify an alternate port (like -p 5353) and
use for instance iptables (on Linux) to forward the traffic:
iptables -t nat -A PREROUTING -i eth0 -p udp --dport 53 -j DNAT --to :5353
(Sent in by Tom Schouten)
PORTABILITY:
iodine has been tested on Linux (x86 and SPARC64), FreeBSD (x86), OpenBSD (x86),

14
iodined.c
View file

@ -168,7 +168,7 @@ static void
usage() {
extern char *__progname;
printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] [-d device] [-m mtu] [-l ip address to listen on] "
printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] [-d device] [-m mtu] [-l ip address to listen on] [-p port]"
"tunnel_ip topdomain\n", __progname);
exit(2);
}
@ -178,7 +178,7 @@ help() {
extern char *__progname;
printf("iodine IP over DNS tunneling server\n");
printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] [-d device] [-m mtu] [-l ip address to listen on] "
printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] [-d device] [-m mtu] [-l ip address to listen on] [-p port]"
"tunnel_ip topdomain\n", __progname);
printf(" -v to print version info and exit\n");
printf(" -h to print this help and exit\n");
@ -188,6 +188,7 @@ help() {
printf(" -d device to set tunnel device name\n");
printf(" -m mtu to set tunnel device mtu\n");
printf(" -l ip address to listen on for incoming dns traffic (default 0.0.0.0)\n");
printf(" -p port to listen on for incoming dns traffic (default 53)\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);
@ -214,6 +215,7 @@ main(int argc, char **argv)
int mtu;
struct passwd *pw;
in_addr_t listen_ip;
int port;
username = NULL;
newroot = NULL;
@ -221,13 +223,14 @@ main(int argc, char **argv)
foreground = 0;
mtu = 1024;
listen_ip = INADDR_ANY;
port = 53;
packetbuf.len = 0;
packetbuf.offset = 0;
outpacket.len = 0;
q.id = 0;
while ((choice = getopt(argc, argv, "vfhu:t:d:m:l:")) != -1) {
while ((choice = getopt(argc, argv, "vfhu:t:d:m:l:p:")) != -1) {
switch(choice) {
case 'v':
version();
@ -253,6 +256,9 @@ main(int argc, char **argv)
case 'l':
listen_ip = inet_addr(optarg);
break;
case 'p':
port = atoi(optarg);
break;
default:
usage();
break;
@ -292,7 +298,7 @@ main(int argc, char **argv)
goto cleanup0;
if (tun_setip(argv[0]) != 0 || tun_setmtu(mtu) != 0)
goto cleanup1;
if ((dnsd_fd = open_dns(argv[1], 53, listen_ip)) == -1)
if ((dnsd_fd = open_dns(argv[1], port, listen_ip)) == -1)
goto cleanup2;
my_ip = inet_addr(argv[0]);