using cmd.exe as a telnet client
donnal at donnal.net
Mon Dec 6 18:40:01 CET 2004
Grant Edwards wrote:
> You don't have to start from scratch. The telnet module has
> hooks built-into it1 so that you can have it call your routines
> to handle option negotiation. I did it once to impliment some
> extra Telnet protocol features, and it wasn't difficult.
Ok, you've inspired me to give it a try. First, I am assuming that you
mean writing a custom callback function to send to
Telnet.set_option_negotiation_callback(callback). Or did you mean
writing a subclass of Telnet? Can someone provide an example of a
callback function that I might use as a template for writing mine?
This is unfamiliar territory for me, but I tried to snoop a bit using
ethereal (also new to me) and as near as I can tell, the options in
0, binary transmission
3, suppress go ahead
23, send location
And it may be that not all of these are critical, but if so, I don't
know how to tell which is which.
Eyal Lotem wrote:
> I think I have a much simpler solution for you guys..
> Assuming you can run arbitrary code on the proprietary
Actually I cannot. The server runs a second-party information system,
the primary access to which is third-party terminal emulator software
that uses telnet connections. What I am trying to do is emulate this
> cmd.exe is not a command line program. It's a terminal (emulator).
> You might be able to use the telnet program, though.
Yes, I see that now. Thanks.
> Before doing this,
> I'd recommend looking at Twisted's telnet support (both
> the version in 1.3 and the version that will be in 2.0),
> which actually supports option negotiation in a
> reasonable way.
I've been wanting to get acquainted with Twisted for awhile now, so this
might be a good time to do so. I think I will give Grant's idea a whirl,
but if I get bogged down there, I will definitely look at Twisted's
telnet support. BTW, do you know if Twisted's option negotiation uses a
callback function? I might download it just to take a look, even if I
don't use it directly.
Arkansas Children's Hospital
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