checkvarian.py

#!/usr/local/bin/python3
import argparse
import dns.resolver
import sys
import time
try:
    import whois
except ImportError or ModuleNotFoundError:
    print ('python-whois module is missing run pip3 install python-whois')
    sys.exit(1)

# set up the command line options
parser = argparse.ArgumentParser(description='Python script to check infoblox cache response and clear invalid cache entries')
parser.add_argument('-d',"--domain",   required=False, default='storefront.hap1017.onprem.varian.com', help='Domain to check infoblox response for', action="store")
parser.add_argument("--debug",         required=False, default=False, help='Enable debug messages', action="store_true")
args = parser.parse_args()

debug=args.debug
url=args.domain

def getns(url):
    # create a dns resolver and point it to use google dns
    r = dns.resolver.Resolver()
    r.nameservers = ['8.8.8.8']
    ns=[]
    w=whois.whois(url)
    for x in w.name_servers:
        for y in r.resolve(x):
            ns.append(y.to_text())
    # filter to keep unique responses
    ns=list(set(ns))
#    if debug:
#        print(ns)
    return ns

def lookup(url):
    error=False
    res = dns.resolver.Resolver()
    if debug:
       print ('checking '+str(res.nameservers)+' for '+url)
    try:
        test=res.resolve(url,'A')
    except dns.resolver.NXDOMAIN:
        print('bad lookup')
        error=True
    except Exception as e:
        print(e)
        error=True
    return error

def sourcelookup(url):
    error=False
    s = dns.resolver.Resolver()
    if url == 'storefront.hap1017.onprem.varian.com':
        s.nameservers=['10.100.182.132','10.100.182.133']
    else:
        s.nameservers=getns(url)
    if debug:
        print ('checking '+str(s.nameservers)+' for '+url)
    try:
        test=s.resolve(url,'A')
    except Exception as e:
        print(e)
        error=True
    return error

while True:
    lookupbad=False
    while lookup(url):
        print ('checking forwarder...')
        while sourcelookup(url):
            print ('sourcelookup failed waiting 5 seconds to try again')
            time.sleep(5)
        print ('infoblox failed response... sourcelookup good, clear cache here, check again in 60 seconds')
        time.sleep(60)
    print ('checking again in 60 seconds...')
    time.sleep(60)