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#!/usr/bin/env python
#
"""
Lookup an MX record and printout all the MX preference, target, and
associated IP addresses of the targets.
"""
import getdns, pprint, sys
extensions = { "return_both_v4_and_v6" : getdns.EXTENSION_TRUE }
def get_ip(ctx, qname):
iplist = []
try:
results = ctx.address(name=qname, extensions=extensions)
except getdns.error as e:
print(str(e))
sys.exit(1)
if results.status == getdns.RESPSTATUS_GOOD:
for addr in results.just_address_answers:
iplist.append(addr['address_data'])
else:
print("getdns.address() returned an error: {0}".format(results.status))
return iplist
if __name__ == '__main__':
qname = sys.argv[1]
ctx = getdns.Context()
try:
results = ctx.general(name=qname, request_type=getdns.RRTYPE_MX)
except getdns.error as e:
print(str(e))
sys.exit(1)
status = results.status
hostlist = []
if status == getdns.RESPSTATUS_GOOD:
for reply in results.replies_tree:
answers = reply['answer']
for answer in answers:
if answer['type'] == getdns.RRTYPE_MX:
iplist = get_ip(ctx, answer['rdata']['exchange'])
for ip in iplist:
hostlist.append( (answer['rdata']['preference'], \
answer['rdata']['exchange'], ip) )
elif status == getdns.RESPSTATUS_NO_NAME:
print("{0}, {1}: no such name".format(qname, qtype))
elif status == getdns.RESPSTATUS_ALL_TIMEOUT:
print("{0}, {1}: query timed out".format(qname, qtype))
else:
print("{0}, {1}: unknown return code: {2}".format(qname, qtype, results["status"]))
for (pref, mx, addr) in sorted(hostlist):
print(pref, mx, addr)
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