#!/usr/bin/env python

import dns.resolver, sys

def get_domain_ip(domain):

    """Get the DNS record, if any, for the given domain."""

    dns_records = list()

    try:

        # get the dns resolutions for this domain

        dns_results = dns.resolver.query(domain)

        dns_records = [ip.address for ip in dns_results]

    except dns.resolver.NXDOMAIN as e:

        print "the domain does not exist so dns resolutions remain empty. domain:", domain

    except dns.resolver.NoAnswer as e:

        print "the resolver is not answering so dns resolutions remain empty, domain:", domain

    return dns_records

hostname = sys.argv[1]

print "Recursive name lookup (simulates dig)..."

n=hostname

try:

  while True:

    for rdata in dns.resolver.query(n, 'CNAME') :

      print n, "cname is", rdata

      n=rdata.target

except:

  print get_domain_ip(n)

#!/usr/bin/env python

import dns.resolver, sys

def get_domain_ip(domain):

    """Get the DNS record, if any, for the given domain."""

    dns_records = list()

    try:

        # get the dns resolutions for this domain

        dns_results = dns.resolver.query(domain)

        dns_records = [ip.address for ip in dns_results]

    except dns.resolver.NXDOMAIN as e:

        print "the domain does not exist so dns resolutions remain empty. domain:", domain

    except dns.resolver.NoAnswer as e:

        print "the resolver is not answering so dns resolutions remain empty, domain:", domain

    return dns_records

def dig_ip(n):

    try:

        while True:

            for rdata in dns.resolver.query(n, 'CNAME') :

                print n, "cname is", rdata

                n=rdata.target

    except Exception as e:

        print e

        return get_domain_ip(n)

if __name__ == "__main__":

    print "Recursive name lookup (simulates dig)..."

    print dig_ip(sys.argv[1])