Hello I'm currently taking a udemy class on python networking and I'm trying to run a script to read device configuration for three virtual machines that i created here is my code.
ssh_connection.py
import paramiko
import os.path
import time
import sys
import re
#Checking username/password file
#Prompting user for input - USERNAME/PASSWORD FILE
user_file = input("\n# Enter user file path and name")
#Verifying the validity of the USERNAME/PASSWORD file
if os.path.isfile(user_file) == True:
print("\n* Username/password file is valid :)\n")
else:
print("\n* File {} does not exist :( Please check and try again.\n".format(user_file))
sys.exit()
#Checking commands file
#Prompting user for input - COMMANDS FILE
cmd_file = input("\n# Enter commands file path and name ")
#Verifying the validity of the COMMANDS FILE
if os.path.isfile(cmd_file) == True:
print("\n* Command file is valid :)\n")
else:
print("\n* File {} does not exist :( Please check and try again.\n".format(cmd_file))
sys.exit()
#Open SSHv2 connection to the device
def ssh_connection(ip):
global user_file
global cmd_file
#Creating SSH CONNECTION
try:
#Define SSH parameters
selected_user_file = open(user_file, 'r')
#Starting from the beginning of the file
selected_user_file.seek(0)
#Reading the username from the file
username = selected_user_file.readlines()[0].split(',')[0].rstrip("\n")
#Starting from the beginning of the file
selected_user_file.seek(0)
#Reading the password from the file
password = selected_user_file.readlines()[0].split(',')[1].rstrip("\n")
#Logging into device
session = paramiko.SSHClient()
#For testing purposes, this allows auto-accepting unknown host keys
#Do not use in production! The default would be RejectPolicy
session.set_missing_host_key_policy(paramiko.AutoAddPolicy())
#Connect to the device using username and password
session.connect(ip.rstrip("\n"), username = username, password = password)
#Start an interactive shell session on the router
connection = session.invoke_shell()
#Setting terminal length for entire output - disable pagination
connection.send("enable\n")
connection.send("terminal length 0\n")
time.sleep(1)
#Entering global config mode
connection.send("\n")
connection.send("configure terminal\n")
time.sleep(1)
#Open user selected file for reading
selected_cmd_file = open(cmd_file, 'r')
#Starting from the beginning of the file
selected_cmd_file.seek(0)
#Writing each line in the file to the device
for each_line in selected_cmd_file.readlines():
connection.send(each_line + '\n')
time.sleep(2)
#Closing the user file
selected_user_file.close()
#Closing the command file
selected_cmd_file.close()
#Checking command output for IOS syntax errors
router_output = connection.recv(65535)
if re.search(b"% Invalid input", router_output):
print("* There was at least one IOS syntax error on device {} :(".format(ip))
else:
print("\nDONE for device {} :)\n".format(ip))
#Test for reading command output
print(str(router_output) + "\n")
#Closing the connection
session.close()
except paramiko.AuthenticationException:
print("* Invalid username or password :( \n* Please check the username/password file or the device configuration.")
print("* Closing program... Bye!")
And here are the three text files its suppose to take
IP.txt:
10.10.10.2
10.10.10.3
10.10.10.4
user.txt: admin,python
cmd.txt: show ip int brief
here is the output 
For some reason it gives me an errno 11001 error even though I got back the loopback interfaces for IP 10.10.10.3 & 10.10.10.4. I'm trying to figure out why 10.10.10.2 isn't working I tried putting the actual username and password in line 62 of ssh_connection like this
session.connect(ip.rstrip("\n"), username = "admin", password = "python")
This was how i was able to get back the loopback address for 10.10.10.3 and 10.10.10.4. Why isn't 10.10.10.2 working when i did the same exact configuration for the other ones
