[Tutor] Telnet to cisco device

[David Heiser]

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: tutor-bounces at python.org [mailto:tutor-bounces at python.org] On
Behalf Of STREET Gideon (SPARQ)
Sent: Monday, February 27, 2006 11:36 PM
To: tutor at 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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