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Top Forums Shell Programming and Scripting how do I handle ssh response with expect Post 302221466 by popeye on Monday 4th of August 2008 01:27:58 PM
Old 08-04-2008
how do I handle ssh response with expect

I am trying to write an expect script that trys to telnet, if telnet fails, trys to ssh to a remote network devices.

The script works fine until the following is received :

spawn telnet 10.3.2.24
Trying 10.3.2.24...
telnet: connect to address 10.3.2.24: Connection refused
10.3.2.24 is not reachable!!
spawn ssh -l myname 10.3.2.24
The authenticity of host '10.3.2.24 (10.3.2.24)' can't be established.
RSA key fingerprint is b1:z6:22:85:3a:a6:z0:ae:6d:b3:9d:f6:77:85:01:aa.
Are you sure you want to continue connecting (yes/no)?

Ive added

expect {continue connecting*} {send "yes\r"}

at different places within the telnet host not reachable section, but cant
get expect to respond.

Ive added the entire script below for those who may want to look at it.







#! /usr/local/bin/expect --
#
# Setup Log file that will contain all steps of the process.
#============================================================
puts "[exec clear]"
set nam "[ clock format [ clock seconds ] -format "%m%d%H%M" ].log"
log_file -a $nam
#
# Open Seedfile and setup log containing failed connections.
#=============================================================
set ifil [open "seedfileofips" r]
set ofil [open "[ clock format [ clock seconds ] -format "%m%d%H%M" ].err" w]
###
# Main Body. While reading the seedfile, telnet to site
# or ssh to site
#=============================================================
while { [gets $ifil host] >=0 } {
send_user "Standby ... Validating ... $host \n"
puts "[exec clear]"
set taclnam "myname"
set tacpswd "mypassword"
set timeout 30
spawn telnet $host

expect {
{telnet:*} {
puts "$host is not reachable!!"
spawn ssh -l myname $host
expect {password:*} {
send "mypassword\n"
expect ">"
send "en\n"
expect "word:*"
send "mypassword\n"
expect "#"
interact
continue
}
}
{timeout} {
puts ""
puts "$host timed out...Router is probably down!!"
expect eof
wait
return
}
{Unknown*} {
expect eof
wait
return
}
{sername:*} {
send "mypassword\n"
expect "ord:"
send "$mypassword\n"
expect ">"
send "en\n"
expect "assword:"
send "$mypassword\n"
expect "#"
interact
continue
}
}
}
 

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RXTELNET(1)						    BSD General Commands Manual 					       RXTELNET(1)

NAME
rxtelnet -- start a telnet and forward X-connections. SYNOPSIS
rxtelnet [-l username] [-k] [-t telnet_args] [-x xterm_args] [-K kx_args] [-w term_emulator] [-b telnet_program] [-n] [-v] host [port] DESCRIPTION
The rxtelnet program starts an xterm window with a telnet to host host. From this window you will also be able to run X clients that will be able to connect securely to your X server. If port is given, that port will be used instead of the default. If setting up the X forwarding failes, rxtelnet will still telnet in to the remote host, but without X forwarding. The supported options are: -l Log in on the remote host as user username. -k Disables keep-alives. -t Send telnet_args as arguments to telnet. -x Send xterm_args as arguments to xterm. -X Send kx_args as arguments to kx. -w Use term_emulator instead of xterm. -b Use telnet_program instead of telnet. -n Do not start any terminal emulator. -v Be verbose. EXAMPLE
To login from host foo (where your display is) to host bar, you might do the following. 1. On foo: rxtelnet bar 2. You will get a new window with a telnet to bar. In this window you will be able to start X clients. SEE ALSO
kx(1), rxterm(1), telnet(1), tenletxr(1), kxd(8) KTH_KRB March 7, 2004 KTH_KRB
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