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#!/usr/bin/env python
#
"""
get-ip.py: resolve given DNS names into IP addresses. The -s switch
constains answers to only ones secured by DNSSEC. The -4 switch only
returns IPv4 addresses, the -6 switch only IPv6 addresses.
An example run:
$ get-ip.py -s www.huque.com www.google.com
www.huque.com: IPv4 50.116.63.23
www.huque.com: IPv6 2600:3c03:e000:81::a
www.google.com: No DNSSEC secured responses found
"""
import getdns, sys, getopt
def usage():
print("""\
Usage: get-ip.py [-s] [-4|-6] <domain1> <domain2> ...
-s: only return DNSSEC secured answers
-4: only return IPv4 address answers
-6: only return IPv6 address answers
-4 and -6 are mutually exclusive. If both are specified, IPv6 wins.
""")
sys.exit(1)
try:
(options, args) = getopt.getopt(sys.argv[1:], 's46')
except getopt.GetoptError:
usage()
else:
if not args:
usage()
extensions = { "return_both_v4_and_v6" : getdns.EXTENSION_TRUE }
desired_addr_type = None
for (opt, optval) in options:
if opt == "-s":
extensions["dnssec_return_only_secure"] = getdns.EXTENSION_TRUE
elif opt == "-4":
desired_addr_type = "IPv4"
elif opt == "-6":
desired_addr_type = "IPv6"
ctx = getdns.Context()
for hostname in args:
try:
results = ctx.address(name=hostname, extensions=extensions)
except getdns.error as e:
print(str(e))
break
status = results.status
if status == getdns.RESPSTATUS_GOOD:
for addr in results.just_address_answers:
addr_type = addr['address_type']
addr_data = addr['address_data']
if (desired_addr_type == None) or (addr_type == desired_addr_type):
print("{0}: {1} {2}".format(hostname, addr_type, addr_data))
elif status == getdns.RESPSTATUS_NO_SECURE_ANSWERS:
print("{0}: No DNSSEC secured responses found".format(hostname))
else:
print("{0}: getdns.address() returned error: {1}".format(hostname, status))
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