Bash script help reading IPs from files. Using expect and ssh

[Luis Arizaga]

Hi folks, I'm a newbie in bash scripting. I'm trying to perform ping tests using bash + expect + some files where I have the IPs of the devices I have to connect to and the IPs to ping. It's a dumb performance test in order to learn a little bit about bash and expect.

Here's the code, I'll explain it below:

#!/bin/bash

 # Collect the current user's ssh and enable passwords

 echo "Rentrez votre login TACACS RR3 s'il vous plaît"

 echo "Normalement real.xxx01"

 read -s -e -r login_tacacs

 echo "----------------------------------------------------"

 echo "Rentrer votre mot de passe TACACS RR3 s'il vous plaît"

 read -s -e -r password_tacacs

 echo "----------------------------------------------------"

 echo "Rentrer votre login perimetre garik (RR2)"

 echo "Normalement prenom.nom"

 read -s -e -r logingarik

 echo "----------------------------------------------------"

 echo "Rentrer votre mot de passe perimete garik"

 read -s -e -r passwordgarik

 echo "----------------------------------------------------"

 echo -ne '\n'

 log_file=test-$(date +%F).log

 touch "$log_file"

# Feed the expect script a device list & the collected passwords

 echo "Connecting to CVPN devices"

for device in $(cat cvpn-lo0.txt); do

for device_ping in $(cat cvpn-pe-ping.txt); do

./test-ospf.exp $device $login_tacacs $password_tacacs $device_ping >> $log_file;

done

done

 echo "----------------------------------------------------"

 echo "Connecting to LNS devices"

 echo -ne '\n'

for device in $(cat lns-lo0.txt); do

for device_ping in $(cat lns-pe-ping.txt); do

./test-ospf.exp $device $login_tacacs $password_tacacs $device_ping >> $log_file;

done

done

 echo "----------------------------------------------------"

 echo "Connecting to XR devices"

 echo -ne '\n'

for device in $(cat xr-lo0.txt); do

for device_ping in $(cat xr-pe-ping.txt); do

./test-ospf.exp $device $logingarik $passwordgarik $device_ping >> $log_file;

done

done

 echo "----------------------------------------------------"

 echo "Connecting to RH devices"

 echo -ne '\n'

for device in $(cat rh-lo0.txt); do

for device_ping in $(cat rh-pe-ping.txt); do

./test-ospf.exp $device $login_tacacs $password_tacacs $device_ping >> $log_file;

done

done

So first I ask for 2 credentials that I need in order to login to different devices. I create a log file and then my idea is to loop between two files: one for the ips of the devices that I have to go in with SSH (cvpn-lo0.txt and all lo0.txt files, there's basically and ip per line in those txt files) and another for the lo0 of the devices I have to ping from every specific source (there's an IP per line as well). The ping is done in expect from the script test-ospf.exp

Thing is that I keep having an error on line 23 (the first for iteration). I don't know what I'm doing wrong. I'm sending the expect script as well in case you want to take a look. Any help would be appreciated.

Expect Script

#!/usr/bin/expect -f


 exp_internal 1
# Set variables
 set timeout 20
 set hostname [lindex $argv 0]
 set username $env(USER)
 set password [lindex $argv 1]
 set lo0_ping [lindex $argv 2]
 
# Announce which device we are working on and at what time
 send_user "\n"
 send_user ">>>>>  Je travaille sur $hostname @ [exec date] :) <<<<<\n"
 send_user "\n"
 
# Don't check keys
 spawn ssh -o StrictHostKeyChecking=no $username\@$hostname
 
# Allow this script to handle ssh connection issues
 expect {
 timeout { send_user "\nTimeout Exceeded - Check Host\n"; exit 1 }
 eof { send_user "\nSSH Connection To $hostname Failed\n"; exit 1 }
 "*#" {}
 "*assword:" {
 send "$password\n"
 }
 }
 
# If we're not already in enable mode, get us there
 expect {
 default { send_user "\nEnable Mode Failed - Check Password\n"; exit 1 }
 "*#" {}
 }
 
# Enter your commands here. Examples listed below


  send "ping $lo0_ping repeat 1000 source loopback0"
  expect "*ms"
  quit
 exit

Thanks in advance folks.

Cheers,

Luis

 

[Jeremiah Bess]

Hey Luis,

I played around a bit with that part of your code that is erroring out and I can't figure out what the problem is. I would suggest for testing purposes to break that command up. Something like this:

for device in $(cat cvpn-lo0.txt); do

echo $device

done

for device_ping in $(cat cvpn-pe-ping.txt); do

echo './test-ospf.exp $device $login_tacacs $password_tacacs $device_ping >> $log_file;'

done

This might help you zero in on what part it's having issues with.

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[Luis Arizaga]

Thanks for your suggestion Jeremiah. I think I'll do that. I'll break the code a little bit in order to analyse it better. I guess I'm trying to learn bash too fast haha :)

Have a nice day.

Regards,

Luis