How do I capture Password prompt

Question

I have the following code (updated to include pexpect):

import sys
import subprocess
import pexpect
print \"0\"
ssh = subprocess.Popen(\"ssh -A -t username1@200.         


        

Answer 1

With guidance from Johannes Holmberg:

import pexpect

prompt = "cisco_prompt"

def start_log():
        global child
        child.logfile = open("/tmp/mylog", "w")

def stop_log():
        global child
        f = open('/tmp/mylog', 'r')
        for line in f:
                cleanedLine = line.strip()
                if cleanedLine: # is not empty
                        print(cleanedLine)
        f.close()
        child.logfile.close

ssh_cmd = "ssh -A -t username1@200.1.2.3 ssh -A -X username2@10.1.2.3"
child = pexpect.spawn(ssh_cmd, timeout=30)
print "Waiting for 1st password prompt"
child.expect ('password')
child.sendline ('password1')
print "Waiting for 2nd password prompt"
child.expect ('password')
child.sendline ('password2')
start_log()
child.expect (prompt)
child.sendline ('conf t')
stop_log()
start_log()
child.expect ('(config)')
stop_log()
print "Ready for more code"
child.close
print "END"

Answer 2

The password prompt isn't written to stdout. You'll need something like pexpect to capture it. This thread has more info: Sending a password over SSH or SCP with subprocess.Popen

Edit: Regarding your updated pexpect code, first of all, if you read the documentation for subprocess, you'll see that communicate() waits for the process to terminate, that's why your program hangs until you kill the ssh session. And your call to pexpect.spawn looks wrong, it expects a string, not a Popen object. You don't need subprocess at all here.