Alert if Public IP or Subnet mask has changed

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Release Time

07/31/2018

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Update Time

01/27/2025

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Public IP Subnet mask

Please run this script as " Custom Monitor ".

NOTE:

Public_IP = "***************" # Enter the Public IP address which with you want to compare
Subnet_mask= "*************" # Enter the Subnet mask which with you want to compare

Edit the above parameters.

This script fire an alert if Public IP or Subnet mask has been changed from specified in the script.

Procedure's Instructions

Public_IP="***************"     # Enter the Public IP address which with you want to compare
Subnet_mask="*************"     # Enter the Subnet mask which with you want to compare

import os
import subprocess
from subprocess import *
import re
import sys
cmd="nslookup myip.opendns.com. resolver1.opendns.com"
cmd1="ipconfig /all"
IP=[]
subnet=[]
al=0

def alert(arg): 
   sys.stderr.write("%d%d%d" % (arg, arg, arg))

try:
    wd=os.environ['PROGRAMDATA']+'\temp'
    if not os.path.exists(wd):
        os.mkdir(wd)
except:
    wd=os.environ['SYSTEMDRIVE']

def check(cmd):
    obj=subprocess.Popen(cmd, shell=True, stdout=PIPE, stderr = PIPE)
    out, err = obj.communicate()
    return out

def compare():
    if IP[0]!=Public_IP or subnet[0]!=Subnet_mask:
        al=1
    else:
        al=0
    return al

fe=check(cmd)
if fe:
    gt=re.findall('Name:(.*)\s\s\s\smyip.opendns.com\r\n(.*)', fe)
    ge=re.findall('Address:(.*)', gt[0][1])
    IP.append(ge[0].strip())

fr=check(cmd1)
if fr:
    gt=re.findall('Subnet\sMask\s.\s.\s.\s.\s.\s.\s.\s.\s.\s.\s.\s:\s(.*)',fr)
    subnet.append(gt[0].strip())

if IP and subnet:
    st=compare()
    if st>0:
        print "System Public IP or Subnet mask has been changed"
        alert(1)
    else:
        print "System Public IP & Subnet mask is same as specified"
        alert(0)

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