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#!/usr/bin/python
# -*- coding: utf-8 -*-
import ldns
import sys
debug = True
# Check args
argc = len(sys.argv)
name = "www.nic.cz"
if argc < 2:
print("Usage:", sys.argv[0], "domain [resolver_addr]")
sys.exit(1)
else:
name = sys.argv[1]
# Create resolver
resolver = ldns.ldns_resolver.new_frm_file("/etc/resolv.conf")
resolver.set_dnssec(True)
# Custom resolver
if argc > 2:
# Clear previous nameservers
ns = resolver.pop_nameserver()
while ns != None:
ns = resolver.pop_nameserver()
ip = ldns.ldns_rdf.new_frm_str(sys.argv[2], ldns.LDNS_RDF_TYPE_A)
resolver.push_nameserver(ip)
# Resolve DNS name
pkt = resolver.query(name, ldns.LDNS_RR_TYPE_A, ldns.LDNS_RR_CLASS_IN)
if pkt and pkt.answer():
# Debug
if debug:
print("NS returned:", pkt.get_rcode(), "(AA: %d AD: %d)" % ( pkt.ad(), pkt.ad() ))
# SERVFAIL indicated bogus name
if pkt.get_rcode() is ldns.LDNS_RCODE_SERVFAIL:
print(name, "is bogus")
# Check AD (Authenticated) bit
if pkt.get_rcode() is ldns.LDNS_RCODE_NOERROR:
if pkt.ad(): print(name, "is secure")
else: print(name, "is insecure")
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