This a simple porting of PingTunnel to Android system.
Ptunnel is an application that allows you to reliably tunnel TCP connections to a remote host using ICMP echo request and reply packets, commonly known as ping requests and replies.
You can the author, Daniel Stoedle, here: daniels@cs.uit.no The official ptunnel website is located here: http://www.cs.uit.no/~daniels/PingTunnel/ The Windows port was created by Mike Miller: mike@mikeage.net
To compile ptunnel, simply run make. If everything goes well, you should end up with a binary called ptunnel. This serves as both the client and proxy. You can optionally install it using "make install". On Windows, run "make ptunnel.exe" to compile the Windows binary. You will need mingw installed, as well as the WinPcap library. WinPcap is available here: http://www.winpcap.org/install/bin/WpdPack_4_0_2.zip
Ptunnel works best when running as root, and usually requires running as root. Again, from the website:
Client: ./ptunnel -p -lp -da -dp [-c ] [-v ] [-u] [-x password] Proxy: ./ptunnel [-c ] [-v ] [-u] [-x password]
The -p switch sets the address of the host on which the proxy is running. A quick test to see if the proxy will work is simply to try pinging this host - if you get replies, you should be able to make the tunnel work.
The -lp, -da and -dp switches set the local listening port, destination address and destination port. For instance, to tunnel ssh connections from the client machine via a proxy running on proxy.pingtunnel.com to the computer login.domain.com, the following command line would be used:
sudo ./ptunnel -p proxy.pingtunnel.com -lp 8000 -da login.domain.com -dp 22
An ssh connection to login.domain.com can now be established as follows:
ssh -p 8000 localhost
If ssh complains about potential man-in-the-middle attacks, simply remove the offending key from the known_hosts file. The warning/error is expected if you have previously ssh'd to your local computer (i.e., ssh localhost), or you have used ptunnel to forward ssh connections to different hosts.
Of course, for all of this to work, you need to start the proxy on your proxy-computer (we'll call it proxy.pingtunnel.com here). Doing this is very simple:
sudo ./ptunnel
If you find that the proxy isn't working, you will need to enable packet capturing on the main network device. Currently this device is assumed to be an ethernet-device (i.e., ethernet or wireless). Packet capturing is enabled by giving the -c switch, and supplying the device name to capture packets on (for instance eth0 or en1). The same goes for the client. On versions of Mac OS X prior to 10.4 (Tiger), packet capturing must always be enabled (both for proxy and client), as resent packets won't be received otherwise.
To protect yourself from others using your proxy, you can protect access to it with a password using the -x switch. The password is never sent in the clear, but keep in mind that it may be visible from tools like top or ps, which can display the command line used to start an application.
Finally, the -u switch will attempt to run the proxy in unprivileged mode (i.e., no need for root access), and the -v switch controls the amount of output from ptunnel. -1 indicates no output, 0 shows errors only, 1 shows info messages, 2 gives more output, 3 provides even more output, level 4 displays debug info and level 5 displays absolutely everything, including the nasty details of sends and receives. The -f switch allows output to be saved to a logfile.
Security features: Please see the ptunnel man-page for instructions.
Ptunnel supports most operating systems with libpcap, the usual POSIX functions and a BSD sockets compatible API. In particular, it has been tested on Linux Fedora Core 2 and Mac OS X 10.3.6 and above. As of version 0.7, ptunnel can also be compiled on Windows, courtesy of Mike Miller, assuming mingw and WinPcap is installed.
Thanks to L. Peter Deutsch for his open-source MD5 implementation, included with ptunnel, but also available here: http://sourceforge.net/projects/libmd5-rfc/
Many thanks also to Mike Miller mike@mikeage.net for his work on creating a Windows port of ptunnel.
Thanks to Sebastien Raveau sebastien.raveau@epita.fr for implementing various security features and SELinux support.
Also thanks to Joe McKenzie, Steffen Wendzel and StalkR for contributing patches to ptunnel.
Ping Tunnel is Copyright (c) 2004-2011, Daniel Stoedle daniels@cs.uit.no, Yellow Lemon Software. All rights reserved. Ping Tunnel is licensed under the BSD License. Please see the LICENSE file for details.