Dns2tcp

Dns2tcp is a tool for relaying TCP connections over DNS. There is only a simple identification mecanism but no encryption : DNS encapsulation must be considered as an unsecure and anonymous transport layer. Resources should be public external services like ssh, ssltunnel ...

Examples

Client:

View list of available connection.

 $ dns2tcpc -z dns2tcp.hsc.fr -k <my-key>  <dns_server>
 Available connection(s) :
         ssh-gw
         ssh6-home
         ssl-tunnel
 $

Line based connection to a remote ssl-tunnel host :

 $ dns2tcpc -r ssl-tunnel -l 4430 -k <my-key> -z dns2tcp._hsc.fr <dns_server>
 listening on port 4430
 ...
 

File configuration :

 $ cat > ~/.dns2tcprc << EOF
 
 domain = dns2tcp.hsc.fr
 resource = ssl-tunnel
 local_port = 4430
 debug_level = 1
 key = whateveryouwant
 server = the_dns_server # or scan /etc/resolv.conf
 EOF
 $ dns2tcpc

Server :

File configuration :

 $ cat > ~/.dns2tcpdrc << EOF
 
 listen = x.x.x.x
 port = 53
 user = nobody
 key = whateveryouwant
 chroot = /var/empty/dns2tcp/
 domain = dns2tcp.hsc.fr
 resources = ssh:127.0.0.1:22 ,          smtp:127.0.0.1:25,
                 pop3:10.0.0.1:110, ssh2:[fe80::1664]:22
 
 EOF
 $ ./dns2tcpd -F -d 1

from https://github.com/alex-sector/dns2tcp