About

httptunnel creates a bidirectional virtual data path tunnelled in HTTP
requests. The requests can be sent via an HTTP proxy if so desired.

This can be useful for users behind restrictive firewalls. If WWW
access is allowed through an HTTP proxy, it's possible to use
httptunnel and, say, telnet or PPP to connect to a computer outside
the firewall.

If you still don't understand what this is all about, maybe you
can find some useful information in the FAQ file.

This program is mostly intended for technically-oriented users.
They should know what to do.

Install

Read INSTALL for instructions on how to build a released version.
If you build the development repository, run ./autogen.sh first.

License

httptunnel is free software. See COPYING for terms and conditions.
If you like it, I would appreciate if you sent a post card to:

Lars Brinkhoff
Bokskogsbacken 66 422 56 Goteborg
Sweden

Information and/or latest release should be available from these places:

• https://github.com/larsbrinkhoff/httptunnel
• http://www.gnu.org/software/httptunnel/httptunnel.html
• ftp://ftp.gnu.org/pub/gnu/httptunnel

I take no responsibility for what you do with this software. It has
the potential to do dangerous things, like disabling the protection
you system administrator has set up for the local network. Read the
DISCLAIMER file.

Usage & Documentation

There are two programs: hts and htc. hts is the httptunnel server
and htc is the client. hts should be installed on a computer outside
the HTTP proxy, and htc should be installed on your local computer.

Documentation about how to use the programs should be searched in this
order:

1. source code
2. --help output
3. FAQ
4. README

Having said that, here are some examples:

• start httptunnel server:
• At host REMOTE, start hts like this:
  hts -F localhost:23 8888 (set up httptunnel server to listen on port 8888 and forward to localhost:23)
• start httptunnel client:
  • At host LOCAL, start htc like this:
    htc -F 2323 -P PROXY_ADDRESS:8000 REMOTE_IP:8888 (set up httptunnel client to forward localhost:2323 to REMOTE_IP:8888 via a local proxy at PROXY_ADDRESS:8000)
• or, if using a buffering HTTP proxy:
  htc -F 2323 -P PROXY_ADDRESS:8000 -B 48K REMOTE_IP:8888
• Now you can do this at host LOCAL:
  telnet localhost 2323 (telnet in to REMOTE_IP:8888 via your httptunnel you just configured above on port localhost:2323)
  ...and you will hopefully get a login prompt from host REMOTE_IP.
• Debugging:
• For debug output, add -Dn to the end of a command, where n is the level of debug output you'd like to see, with 0 meaning no debug messages at all, and 5 being the highest level (verbose).
• ex: htc -F 10001 -P PROXY_ADDRESS:8000 REMOTE_IP:8888 -D5 will show verbose debug output (level 5 debugging) while setting up an httptunnel client to forward localhost:10001 to REMOTE_IP:8888 via a local proxy at PROXY_ADDRESS:8000

External help, examples, & links

• https://sergvergara.files.wordpress.com/2011/04/http_tunnel.pdf - excellent httptunnel tutorial, examples, & info
• http://sebsauvage.net/punching/ - another excellent example
• https://daniel.haxx.se/docs/sshproxy.html - more useful info
• http://neophob.com/2006/10/gnu-httptunnel-v33-windows-binaries/ - httptunnel Win32 binaries (download here)
• Google search for "http tunnel v3.3" - brings up lots of good links to httptunnel (this search seems to work better than searching for "httptunnel" alone since the latter brings up many generic search results or results pertaining to other tools)