I have written a small code in python to automate the configuration tasks on multiple Cisco routers using telnet library. In the first iteration everything works fine, the problem is I am getting timed out in the second iteration on the function read_all(). If I remove the time-out parameter from the telnetlib.Telnet() function, I am stuck forever in the same iteration.
from telnet import telnet
import xlrd
class handler:
excel_sheet=None
ipv4_devices=None
ipv6_devices=None
config=None
telnet=None
def __init__(self):
self.excel_sheet = xlrd.open_workbook("ipv4_devices.xlsx")
self.config=open("config.txt","r")
output_init = open("output.txt","w+")
output_init.write("")
output_init.close()
def execute(self):
row = None
column = None
self.ipv4_devices = self.excel_sheet.sheet_by_index(0)
for row in range(self.ipv4_devices.nrows-1):
self.telnet = telnet(self.ipv4_devices.cell_value(row+1,0),self.ipv4_devices.cell_value(row+1,1), self.ipv4_devices.cell_value(row+1,2), self.ipv4_devices.cell_value(row+1,3), self.config)
self.telnet.do_telnet()
self.telnet=None
self.config.close()
Above is my Handler.py file, which in turn calls my telnet.py file containing the actual telnet code.
import sys
import telnetlib
class telnet:
ipv4_address=None
port=0
username=None
passphrase=None
config=None
def __init__(self, ipv4_address=None, port=23, username=None, passphrase=None, config=None):
if (ipv4_address is not None) and (username is not None) and (passphrase is not None) and (config is not None) :
self.ipv4_address = ipv4_address
self.port = port
self.username = username
self.passphrase = passphrase
self.config = config
else:
exit()
def do_telnet(self):
output = open("output.txt","a")
remote= telnetlib.Telnet(self.ipv4_address,int(self.port))
remote.read_until("Username: ")
remote.write(self.username.encode('ascii')+"\n")
remote.read_until("Password: ")
remote.write(self.passphrase.encode('ascii')+"\n")
remote.write(self.config.read().encode('ascii')+"\n")
output.write(remote.read_all()+"\n"+" ------- "+"\n")
remote.close()
output.close()
Below is the error I get, when I am timed out
Traceback (most recent call last):
File "Automate.py", line 5, in <module>
automate_it.execute()
File "/home/abdultayyeb/Desktop/Automation/handler.py", line 30, in execute
self.telnet.do_telnet()
File "/home/abdultayyeb/Desktop/Automation/telnet.py", line 31, in do_telnet
output.write(remote.read_all()+"\n"+" ------- "+"\n")
File "/usr/lib/python2.7/telnetlib.py", line 385, in read_all
self.fill_rawq()
File "/usr/lib/python2.7/telnetlib.py", line 576, in fill_rawq
buf = self.sock.recv(50)
socket.timeout: timed out
I suggest re-writing this to use netmiko as it will handle the idiosyncrasies of dealing with Cisco IOS.
The key is to specify your device type as cisco_ios_telnet.
This will have the added benefit of not needing to re-write your code when you convert your systems to SSH. You would simply change the device type from cisco_ios_telnet to cisco_ios