Linux – expect script + expect miss the send string + delay issue

expectlinuxshell-scriptingsolarisssh

I write the active.ksh script (based on expect) in order to login automatically to some Solaris machine and execute the hostname command (login to virtual IP in order to verify which hostname is the active machine – I have two cluster solaris machines )

The problem is with expect; expect sends the password string (pass123) and it misses the Password question, and it still waits for the password.

So actually the password (pass123) was entered after password
question. On most cases the expect script works fine but sometimes it missed the password.

EXAMPLE OF THE PROBLEM

 ./active.ksh
 spawn ssh 10.10.18.61
 sh: /usr/local/bin/stty: not found
 This computer system, including all related equipment, networks and network devices      (specifically including Internet access),is provided only for authorized uss
 Password:        * my remark - pass123 string was missed the Password Question        pass123
 Password:

THE SCRIPT

  #!/bin/ksh

  VIP_ADDRESS=10.10.18.61


  expect_for_verify_which_active_machine=`cat << EOF
  set timeout -1
  spawn  ssh   $VIP_ADDRESS 
  expect {
  ")?"   { send "yes\r"  ; exp_continue  }
  Password:  {send "pass123\r"}
  }
  expect >  {send "hostname\r"}
  expect >    {send exit\r}
  expect eof
  EOF`


  expect -c  "$expect_for_verify_which_active_machine"

EXAMPLE OF RIGHT RESULTS

  ./active.ksh 
  [Friday, February 24, 2012  2:32:06 PM IST] INFO Verify which is active SMU machine 
  spawn ssh 10.10.18.61
  sh: /usr/local/bin/stty: not found
  This computer system, including all related equipment, networks and network devices       (specifically including Internet access),is provided only for authorized uss
  yes
  Password: 
  Last login: Fri Feb 24 14:32:06 2012 from smu1a
  This computer system, including all related equipment, networks and network devices       (specifically including Internet access),is provided only for authorized uss
  solaris1:/ ROOT > hostname
  solaris1
  solaris1:/ ROOT > exit

  logout
  Connection to 10.10.18.61  closed.

Best Answer

You will want to avoid using "Password:" if you monitor your strings during login, you will find that it is not always capitalized.

Changing your expect to -re "(.*)assword:" or "assword:" tends to be much more effective for catching the line.

If you find that the timings are still too quick you can put a sleep 1; before your send

This is what i use for expect

expect {
    "(yes/no)?" { send "yes\n" }
    "passphrase" { send "\r" }
    -re "(.*)assword:"  { sleep 1; send -- "password\r" }
    -re $prompt { return }
    timeout     { puts "un-able to login: timeout\n"; return }
    eof         { puts "Closed\n" ; return }
}
Related Topic