Wednesday, October 14, 2015

Remote command with Paramiko-Expect
#!/usr/bin/env python
# PyNet Class Exercises by Nick Ellson
__author__ = "Nick Ellson"
import paramiko
from paramikoe import SSHClientInteraction
import getpass

# Collect an target, user, and password. This example assumes that privilege level 15 is on your Cisco VTY.
ip = input("Enter Host: ")
username = input("Enter Username: ")
password = getpass.getpass()

#Initialize teh Paramiko connection
remote_conn_pre = paramiko.SSHClient()
remote_conn_pre.connect(ip, username=username, password=password, allow_agent=False, look_for_keys=False)
print ("SSH connection established to %s" % ip)

# Here we make a simple Paramiko only shell because we do not yet have a prompt example to work with for Expect.
# So this will basically log us in, and grab that prompt that we land with, and disconnect.
remote_conn = remote_conn_pre.invoke_shell()   
output = remote_conn.recv(1000).decode("utf-8")
prompt = output.strip()

# Now we reconnect with the paramiko expect module and we have a nice interactive conversation.
remote_conn_pre.connect(ip, username=username, password=password, allow_agent=False, look_for_keys=False)
interact = SSHClientInteraction(remote_conn_pre, timeout=20, display=False)

#Logged in, wait for the prompt to display.
#Shut off the --more-- prompting
interact.send('terminal length 0')
#We don't care about the output for that last command, so just clear the buffer.
cmd_output = interact.current_output_clean
#Let's grab something BIG that use dto be a real timing issue the old way, not knowing how long it might take to get a full 
# running config over a WAN link. Now we do not care, we will simply wait to the prompt shows up. 
interact.send('show running-config')
cmd_output = interact.current_output_clean
print (cmd_output)

#Close our session

No comments:

Post a Comment