CODEWITHSUNDEEP
python
Bhavani Kannan
Bhavani Kannan

Reputation: 1279

Continuous check for VPN Connectivity - Python

Is there any efficient way to check and report in a log file or on the console may be... when ever the VPN is disconnected?

import time
print time.asctime( time.localtime(time.time()) )

Can print the time but I do not know what is the code to recursively find whether the VPN is active or not. Pinging it in a while(1) would be a stupid way to check if the connection is active or not. Any way to achieve this?

Upvotes: 2

Views: 12761

Answers (3)

Summit Amola
Summit Amola

Reputation: 9

This method uses the NAME of the HOST "Connection-specific DNS Suffix" associated with your IP (Mostly the corporation's VPN):

import os
import platform
def check_ping():
   hostname = "xyz.com" #hostname will be..Name under: "Connection-specific DNS Suffix" when you type "ipconfig" in cmd..
   response = os.system("ping " + ("-n 1 " if  platform.system().lower()=="windows" else "-c 1 ") + hostname)
   # and then check the response...
   if response == 0:
       pingstatus = "Network Active: Connected"
   else:
       pingstatus = "Network Error: Not Connected"

   return pingstatus
response = check_ping()
print(response)

Upvotes: 0

mojovski
mojovski

Reputation: 601

In case the IP of vpn changes, you can check if a tunnel has been established at all.

import psutil
import logging, os, time
import subprocess
import sys

procname = "yourprocess_name"

while True:
    cmdout = subprocess.Popen(["ifconfig | grep tun"],stdout = subprocess.PIPE, shell=True).communicate()[0]
    print "cmdout: "+str(cmdout)
    time.sleep(2)
    #-----
    if "tun" in cmdout:
        print "seems to be ok"
    if not "tun" in cmdout: 
        # perform action for lost connection
        print "killing "+str(procname)
        for proc in psutil.process_iter():
            # check whether the process name matches
            print "Listing procname: "+str(proc.name())
            if proc.name() == procname:
                proc.kill()
                sys.exit()

Upvotes: 0

Ferran
Ferran

Reputation: 14993

This solution is system dependent, I do know that it works on Linux because I've done something similar, but not sure about Windows though. I don't know if you want a solution not involving ping, but I think this is a good solution.

import logging, os, time

PING_HOST='10.10.10.10'  # some host on the other side of the VPN

while True:
    retcode = os.system('ping -c 1 %s' % PING_HOST)

    if retcode:  
       # perform action for lost connection
       logging.warn('Lost visibility with %s' % PING_HOST)

    time.sleep(10)  # sleep 10 seconds

This works because ping returns a return code of 0 for success. All other return codes signify an error.

Upvotes: 5

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