topic Re: Automating telnet script in Operating System - HP-UX

Automating telnet script

Tim O'Connell — Thu, 27 Jan 2005 04:22:21 GMT

Hi,

I'm on HPUX 11.11i. Does anyone know if it is possible to automate a telnet script & pass in the username, password & a command and the exit. For testing purposes, I need to write a script to telnet to a router & run the command "sh dialer". I can't seem to find a way to pass the details to telnet from a file.
what I need to do in words is:
telnet 11.11.111.111 (i.e. IP address)
input USERNAME
input PASSWORD
sh dialer
exit

This will be run in the crontab overnight & thescreen output send to a log file for monitoring

Thanks,

Tim

Re: Automating telnet script

Mobeen_1 — Thu, 27 Jan 2005 04:35:17 GMT

Tim,
I think the following should work, i don't have access to a Unix system right now to verify

$ telnet 11.11.111.111
USERNAME
PASSWORD
sh dialer
exit

OR

$ telnet 11.11.111.111 USERNAME PASSWORD
sh dialer
exit

Try and let me know if one of the above works

rgds
Mobeen

Re: Automating telnet script

Peter Godron — Thu, 27 Jan 2005 04:36:54 GMT

Tim,
the normal way for doing this in a production environment would be via expect.
See
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=45609
for solution of your problem.
Regards

Re: Automating telnet script

Tim O'Connell — Thu, 27 Jan 2005 05:55:30 GMT

Sorry, Mobeen

The telnet commands did'nt work

Will look at Expect.

Points assigned

Thanks,

Tim

Re: Automating telnet script

Matthew_50 — Sun, 30 Jan 2005 22:19:26 GMT

expect script sample

#!/usr/local/bin/expect -f
spawn telnet 123.123.123.123
expect "login:"
send "snoopy\r"
expect "Password:"
send "snoopy\r"

Re: Automating telnet script

Chris Vail — Mon, 31 Jan 2005 17:38:05 GMT

This is a BAD idea: don't do it! It reflects poor system security practice. Telnet sends passwords unencrypted. If telnet is the only connection offered by the router, your system is badly out of date.

Try echo "$USERNAME\r$PASSWORD\r$COMMAND"|telnet HOST.
(The \r is the equivalent of the key. If this doesn't work, try \013 instead of the \r. The \013 is the octal equivalent of the key.)

This is really ugly, but might work for you. I can't test this on any of my systems here or the security people would have my head on a platter--and rightfully so.

Re: Automating telnet script

Chris Vail — Mon, 31 Jan 2005 17:58:48 GMT

Oops: I told you wrong. The octal equivalent of \r is \015, not \013. Sometimes I confuse myself.

Chris

Re: Automating telnet script

Biswajit Tripathy — Mon, 31 Jan 2005 18:08:44 GMT

AFAIK, "echo usrname\rpasswd | telnet HOST" does
not work for telnet as telnet, by default, reads from
tty.

- Biswajit

Re: Automating telnet script

Tim O'Connell — Tue, 01 Feb 2005 04:54:56 GMT

Thanks for all the replies. I know telnet has its holes but I won't be running this for long. I am trying to determine which pc's are bringing up the ISDN lines at night. I got it working by doing the following: (PASSWORD is the password on the router)

router=99.99.999.99
(echo PASSWORD
sleep 2
echo sh isdn act
sleep 2
echo exit
while read cmd
do
echo $cmd
done
)|telnet $router | tee /tmp/ky_routers_up.log

Points awarded,

Thanks

Tim