Ether2Any and PyTap

===================

Ether2Any is a Python base class for writing arbitrary Ethernet/IP tunnels

using a TUN/TAP device.



PyTap is a Python class for handling a TUN/TAP device. It exposes

reading/writing to the device and abstracts a bit of the network configuration.





Installation and requirements

=============================

Just put it somewhere and import it. For PyTaps network configuration

functions you need /sbin/ifconfig.





How to write an Ethernet/IP tunnel

==================================

Writing a tunnel with this is rather easy. All you have to do is to create a

class inheriting from Ether2Any and implement the method sendToNet().

sendToNet() will be called for each incoming network packet. If you add extra

sockets to the select loop via addSocket, sendToDev() needs to be implemented,

which gets the socket with the new data. If you don't want to rely on select you

are free to pass self.dev (which is a PyTap() instance) and call dev.write()

whenever you like. Note that if you write invalid network packets on it, you may

get an exception.



Afterwards you can instantiate your class and call the run() method to start

your tunnel.





What could be done

==================

 * Builtin packet aggregation would be nice

 * Various FIXMEs/TODOs

 * Replace ifconfig with the ip utility

 * Add plugin architecture to PyTap for traffic mangling

 * setuptools/pypi dance