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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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TELNET-PROBE(1) 					      General Commands Manual						   TELNET-PROBE(1)

NAME
telnet-probe - lightweight telnet-like port probe SYNOPSIS
$PCP_BINADM_DIR/telnet-probe [-c] [-v] host port DESCRIPTION
telnet-probe allows the pmdashping(1) daemons to establish connections to arbitrary local and remote service-providing daemons so that response time and service availability information can be obtained. The required host and port number arguments have the same meaning as their telnet(1) equivalents. The -c option causes telnet-probe to perform a connect(2) only. This skips the read(2) and write(2) exercise that would otherwise be done after connecting (see below). The -v option causes telnet-probe to be verbose while operating. Once the telnet connection has been established, telnet-probe reads from stdin until end-of-file, and writes all the input data to the tel- net connection. Next, telnet-probe will read from the telnet connection until end-of-file, discarding whatever data it receives. Then telnet-probe exits. To operate successfully, the input passed via telnet-probe to the remote service must be sufficient to cause the remote service to close the connection when the last line of input has been processed, e.g. ending with ``quit'' when probing SMTP on port 25. By default telnet-probe will not produce any output, unless there is an error in which case a diagnostic message can be displayed (in ver- bose mode only) and the exit status will be non-zero indicating a failure. PCP ENVIRONMENT
Environment variables with the prefix PCP_ are used to parameterize the file and directory names used by PCP. On each installation, the file /etc/pcp.conf contains the local values for these variables. The $PCP_CONF variable may be used to specify an alternative configura- tion file, as described in pcp.conf(5). DIAGNOSTICS
If telnet-probe succeeds, then 0 will be returned. If the attempt to establish a connection fails or is terminated, then a non-zero exit status is returned. SEE ALSO
PCPintro(1), pmdashping(1), pmie(1), telnet(1), connect(2), read(2) and write(2). Performance Co-Pilot PCP TELNET-PROBE(1)
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