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    <p>I figured this out.. You have to use client.lookupAllRecords and then test the type of records returned..</p> <pre><code>#!/usr/bin/python from twisted.internet import defer, reactor from twisted.names import client, dns def got_arg(*args): for a in args[0][0]: if a.payload.TYPE == dns.A: print 'A - ipv4',a.payload elif a.payload.TYPE == dns.AAAA: print 'AAAA - ipv6',a.payload def get_arg(arg): d = client.lookupAllRecords('www.google.com').addCallback(got_arg) if __name__ == '__main__': get_arg('www.google.com') reactor.run() </code></pre> <p><strong>EDIT</strong></p> <p>I realize this solution is insufficient - specifically in the case where the first batch of records only contains a single CNAME pointing to another address..</p> <p>The reason for this is that the twisted.names.common.extractRecord() looks first for ipv6 addresses and immediately returns them - with no obvious mechanism to override this behavior. </p> <p>So, I put together a hacky solution for this so that we don't even try to resolve down the chain on ipv6 addresses by making an ugly monkey patch..</p> <pre><code>#!/usr/bin/python import socket from twisted.names import dns from twisted.names import common def myExtractRecord(resolver, name, answers, level=10): if not level: return None for r in answers: if r.name == name and r.type == dns.A: return socket.inet_ntop(socket.AF_INET, r.payload.address) for r in answers: if r.name == name and r.type == dns.CNAME: result = myExtractRecord( resolver, r.payload.name, answers, level - 1) if not result: return resolver.getHostByName( str(r.payload.name), effort=level - 1) return result # No answers, but maybe there's a hint at who we should be asking about # this for r in answers: if r.type == dns.NS: from twisted.names import client r = client.Resolver(servers=[(str(r.payload.name), dns.PORT)]) return r.lookupAddress(str(name) ).addCallback( lambda (ans, auth, add): myExtractRecord(r, name, ans + auth + add, level - 1)) common.extractRecord = myExtractRecord </code></pre> <p>I put that in dnsclient.py and use it in my main prog by:</p> <pre><code>from twisted.names import client import dnsclient </code></pre> <p>If there's a more elegant solution for this, I'm all ears. I think this would be more friendly if getHostByName accepted a mask of dns.A,dns.AAAA,dns.A &amp;&amp; dns.AAAA for figuring out which records to walk the tree of.</p>
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    1. POCan twisted.names.client be forced to return ipv4 addresses? (without modifying resolv.conf or ETH devices)
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