Re: [Tutor] Telnet to cisco device

[David Heiser]

Title: Message

 

The following works with the Cisco switch that I have available. Cisco 4006 with CatOS 6.2. It may not work with your model/OS or your switch may be configured differently. For instance, the default prompt terminates with "(enable)" so I used "tn.read_until(')')" instead of "tn.read_until(HOST + '#')".

 

----------------------------------------------

import getpass
##import sys
import telnetlib

 

##HOST = 'switch_name'  # this is the hostname for device, to be changed to read from file when figure that out
HOST = '10.216.1.223'  # this is the hostname for device, to be changed to read from file when figure that out

 

##user = raw_input('Username: ')
""" My switch does not require a username """

 

##password = getpass.getpass()
print
loginpassword = getpass.getpass('Login password: ')
""" The login password and enable password may not be the same """

 

tn = telnetlib.Telnet(HOST) #make less typing for me

 

##tn.read_until('Username: ') #expected prompt after telnetting to the router
##tn.write(user + '\r\n')  #hopefully write username and pass character return
##raw_input('ENTER to continue') # just to see if it makes this far
# this is where the program appears to hang

 

##tn.read_until('Password: ') #expected prompt after putting in the username
tn.read_until('password:')
""" tn.read_until(':') may also work """

 

##tn.write(password + '\r\n')
tn.write(loginpassword + '\n')

 

##tn.read_until(HOST + ">") #expected prompt is "hostname>"
tn.read_until(">")
""" The prompt may not contain the HOST name """

 

tn.write('enable \n') # go to exec mode

 

##tn.read_until('Password: ') #prompt to go to exec mode
tn.read_until(':')

 

print
enablepassword = getpass.getpass('Enable password: ')
##tn.write(password + '\n')
tn.write(enablepassword + '\n')

 

##tn.read_until(HOST + '#')  #this should be the prompt after enable "hostname#"
tn.read_until(')')  #this should be the prompt after enable "hostname#"

 

##tn.write('sh int status' '\r\n') #run this command, read this from file when i figure out how
tn.write('sh int\n')
""" This command works on a Cisco 4006 with CatOS 6.2 """

 

##tn.read_until(HOST + '#') #prompt once above command has finished running, useful when reading multiple commands
print
print tn.read_until(')')

 

##tn.write('exit' '\R\N') #disconnect from the session
tn.write('exit \n')

 

##print tn.read_all() #prints out something, maybe needs to be prior to "exit" command

 

##tn.close()
""" I don't think you need this """

 

 

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of STREET Gideon (SPARQ)
Sent: Monday, February 27, 2006 11:36 PM
To: tutor@python.org
Subject: [Tutor] Telnet to cisco device

Hi all,

I'm trying to get a script together to automate adding a couple of commands across a lot of cisco switches.  Thought I'd try to get the script working correctly on one switch first.  I've been reading a few online tutorials and have managed to kludge up the following (which fails where commented).  Anyone able to advise where I may be going wrong?

I'm sitting on a windows box here at work, otherwise I'd see what I could get expect to do.

Thanks

Gideon

--------------------
import getpass
import sys
import telnetlib

HOST = 'switch_name'  # this is the hostname for device, to be changed to read from file when figure that out
user = raw_input('Username: ')
password = getpass.getpass()

tn = telnetlib.Telnet(HOST) #make less typing for me

tn.read_until('Username: ') #expected prompt after telnetting to the router
tn.write(user + '\r\n')  #hopefully write username and pass character return

raw_input('ENTER to continue') # just to see if it makes this far

# this is where the program appears to hang

tn.read_until('Password: ') #expected prompt after putting in the username
tn.write(password + '\r\n')

tn.read_until(HOST + ">") #expected prompt is "hostname>"
tn.write('enable \n') # go to exec mode

tn.read_until('Password: ') #prompt to go to exec mode
tn.write(password + '\n')

tn.read_until(HOST + '#')  #this should be the prompt after enable "hostname#"
tn.write('sh int status' '\r\n') #run this command, read this from file when i figure out how

tn.read_until(HOST + '#') #prompt once above command has finished running, useful when reading multiple commands

tn.write('exit' '\R\N') #disconnect from the session

print tn.read_all() #prints out something, maybe needs to be prior to "exit" command

tn.close()
 

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