Greetings
I'd like to do some tweaks on a telnet session as I have no control over
the server side what so ever.
However I cannot correctly negotiate a telnet connection to the server.
I've gone back to basics on the code for simplicity here;
Linux 2.6 : Python 2.3.4
Telnetlib Module - http://www.python.org/doc/2.3.4/lib/...telnetlib.html
import sys, telnetlib
tn = telnetlib.Telne t("xxx.xxx.xxx. xxx")
tn.mt_interact( )
All goes well if I point this code to telnet to 127.0.0.1 (Login etc)
However if I point the code to telnet to the server I get;
Debian GNU/Linux 3.0 xxx.xxx.org
Error opening terminal: network.
Note - telnet from the console to this address works fine.
I have limited knowledge of telnet/terminals however I am beginning to
think that the "server" is trying to negotiate a terminal type
(vt100/vt220 I think) and telnetlib responds incorrectly/not at all.
Any thoughts would be much appreciated / is there a more suitable library
than telnetlib for my purpose?
Many thanks ..... Svha 3 4983
My bad - omitted the set_debuglevel( ) output from the above post ...
Hey it was a Friday afternoon ;) tn = telnetlib.Telne t(xxx.xxx.org) tn.set_debuglev el(10) tn.mt_interact( )
Telnet(xxx.xxx. org,23): recv "\xff\xfd\x18\x ff\xfd \xff\xfd#\xff\x fd'"
Telnet(xxx.xxx. org,23): IAC DO 24
Telnet(xxx.xxx. org,23): IAC DO 32
Telnet(xxx.xxx. org,23): IAC DO 35
Telnet(xxx.xxx. org,23): IAC DO 39
Telnet(xxx.xxx. org,23): recv '\xff\xfb\x03\x ff\xfd\x01\xff\ xfd\x1f\xff\xfb \
x05\xff\xfd!'
Telnet(xxx.xxx. org,23): IAC WILL 3
Telnet(xxx.xxx. org,23): IAC DO 1
Telnet(xxx.xxx. org,23): IAC DO 31
Telnet(xxx.xxx. org,23): IAC WILL 5
Telnet(xxx.xxx. org,23): IAC DO 33
Telnet(xxx.xxx. org,23): recv '\xff\xfb\x03'
Telnet(xxx.xxx. org,23): IAC WILL 3
Telnet(xxx.xxx. org,23): recv '\xff\xfb\x01'
Telnet(xxx.xxx. org,23): IAC WILL 1
Telnet(xxx.xxx. org,23): recv 'Debian GNU/Linux 3.0 x.x.org\r\nErro r opening'
Debian GNU/Linux 3.0 xxx.xxx.org
Error openingTelnet(x xx.xxx.org,23): recv ' terminal: network.\r\n'
terminal: network.
Svha
On Fri, 19 Nov 2004 20:22:27 +0000, Svha wrote:
Greetings
I'd like to do some tweaks on a telnet session as I have no control over the server side what so ever.
However I cannot correctly negotiate a telnet connection to the server.
I've gone back to basics on the code for simplicity here;
Linux 2.6 : Python 2.3.4 Telnetlib Module - http://www.python.org/doc/2.3.4/lib/...telnetlib.html
import sys, telnetlib tn = telnetlib.Telne t("xxx.xxx.xxx. xxx") tn.mt_interact( )
All goes well if I point this code to telnet to 127.0.0.1 (Login etc)
However if I point the code to telnet to the server I get; Debian GNU/Linux 3.0 xxx.xxx.org Error opening terminal: network. Note - telnet from the console to this address works fine.
I have limited knowledge of telnet/terminals however I am beginning to think that the "server" is trying to negotiate a terminal type (vt100/vt220 I think) and telnetlib responds incorrectly/not at all.
Any thoughts would be much appreciated / is there a more suitable library than telnetlib for my purpose?
Many thanks ..... Svha
Svha <ne**@svha.demo n.co.uk> writes: Greetings
I'd like to do some tweaks on a telnet session as I have no control over the server side what so ever.
However I cannot correctly negotiate a telnet connection to the server.
I've gone back to basics on the code for simplicity here;
Linux 2.6 : Python 2.3.4 Telnetlib Module - http://www.python.org/doc/2.3.4/lib/...telnetlib.html
import sys, telnetlib tn = telnetlib.Telne t("xxx.xxx.xxx. xxx") tn.mt_interact ()
All goes well if I point this code to telnet to 127.0.0.1 (Login etc)
However if I point the code to telnet to the server I get; Debian GNU/Linux 3.0 xxx.xxx.org Error opening terminal: network. Note - telnet from the console to this address works fine.
I have limited knowledge of telnet/terminals however I am beginning to think that the "server" is trying to negotiate a terminal type (vt100/vt220 I think) and telnetlib responds incorrectly/not at all.
Any thoughts would be much appreciated / is there a more suitable library than telnetlib for my purpose?
telnetlib support for this is minimal. Basically, you'll need to implement
the negotiation yourself using the option_callback () method. Look at http://www.faqs.org/rfcs/rfc1091.html for the gory details on what's expected.
The negotiation could get quite complex in principle. One of the other
options it's asking about is for X-server, you may have to deal with that
too.
I've done a small amount of work in this area so I may be able to help, if you
get stuck send me mail.
Eddie
Svha <ne**@svha.demo n.co.uk> wrote: My bad - omitted the set_debuglevel( ) output from the above post ... Hey it was a Friday afternoon ;) tn = telnetlib.Telne t(xxx.xxx.org) tn.set_debuglev el(10) tn.mt_interact( )
Telnet(xxx.xxx. org,23): recv "\xff\xfd\x18\x ff\xfd \xff\xfd#\xff\x fd'"
This is documented in RFC 854, 930, 990, etc,
e.g., www.faqs.org/rfcs/rfc854.html
(google "telnet options")
--
Thomas E. Dickey http://invisible-island.net ftp://invisible-island.net This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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