Telnet server implementation

[kumar]

Hi all,

I want to write a telnet server for an embedded linux box using
python.The problem is that it doesn't give a shell ( just a limited
CLI commands for configuring it . )My requirement is to write a telnet
server ( residing on the box) listening on some specific port where it
can listen to telnet requests from clients and provide them an
interactive command line session. I tried using the python's
async_chat module but it is very limited ..any wrappers around this
module so that it can be used more interactively ?? . Any pointers
would be highly appreciated . The current available CLI on this box
allows me to write python scripts remotely , ftp it and run them, so
executing them won't be problem.

Thanks
kumar

[Andrew Bennetts]

Re: Telnet server implementation

On Tue, Dec 02, 2003 at 03:49:23AM -0800, kumar wrote:[color=blue]
> Hi all,
>
> I want to write a telnet server for an embedded linux box using
> python.The problem is that it doesn't give a shell ( just a limited
> CLI commands for configuring it . )My requirement is to write a telnet
> server ( residing on the box) listening on some specific port where it
> can listen to telnet requests from clients and provide them an
> interactive command line session. I tried using the python's
> async_chat module but it is very limited ..any wrappers around this
> module so that it can be used more interactively ?? . Any pointers
> would be highly appreciated . The current available CLI on this box
> allows me to write python scripts remotely , ftp it and run them, so
> executing them won't be problem.[/color]

You should be able to use Twisted's telnet implementation for this. There's
an implementation included where the command line session is a pseudo-python
interactive interpreter, which is implemented in twisted/manhole/telnet.py,
the Shell and ShellFactory classes.

You easily can see this in action by running Twisted's mktap and twistd
commands:

mktap telnet --port 4040 --username foo --password bar
twistd -nf telnet.tap

You should be able to figure out how to implement your own telnet command
interpreter in Twisted by reading that code -- if not, please ask for help
on twisted-python@twistedm atrix.com

-Andrew.