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How to automate Python to use Telnet to check ports

 Checking ports automatically can be stressful if there are quite a few addresses and ports to be checked.

And typing manually is prone to error by mistyping the IP Address and Port.

This is where automation comes into play.

Prepare the IP Address and Port on  a text file, and once all is prepared.

Let Python do the job or the task to Telnet and check the port whether the system can successfully connect or not.

The tester just need to watch or monitor the terminal or do some other task, while waiting for the Python to do its job.

Simple code below shows, how to do this task.

#=====================================

import sys

import telnetlib


def get_all_ips(filename_to_check):

  with open(filename_to_check, 'r') as entries:

    for ip_entries in entries:

      ip_and_port=ip_entries.split(" ")          

      the_ip=ip_and_port[0]

      the_port_num=ip_and_port[1]

      the_ip=the_ip.strip()

      the_port_num=the_port_num.strip()

      print("IP Address is: ",the_ip, "Port number is: ",the_port_num)

      try:

        conn = telnetlib.Telnet(the_ip,the_port_num)

        telnet_response = the_ip +' ' + the_port_num +' - Able to reach - OK'

      except:

        telnet_response = the_ip +' ' + the_port_num +' - Failed cannot reach'

      finally:

        print(telnet_response)

if __name__ == "__main__":

  get_all_ips("ip_and_ports.txt")

#=====================================
The ip_and_ports.txt or the text file which has the IP Address and port, needs to follow this format below:


Sample Output of the Python Script:




Cheers! Take care. Till next Time. Enjoy exploring the world of Python automation and enjoy the journey of learning..


Stay safe! and Keep things up! 

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