I'm trying to write a program that will call my own function whenever a query to a nameserver times out. I have figured out how to run the DNS server. And I also know how to use filterAnswers(). But how do I catch the "Failure: twisted.names.error.DNSQueryTimeoutError:" messages by adding code to the resolver I've constructed? I've got something like this:
class myResolver(client.Resolver): def filterAnswers(self, message): print "answer:",message [snipped code] resolver = myResolver(servers=[('10.0.1.1', 53)]) f = server.DNSServerFactory(clients=[resolver]) reactor.listenTCP(4053, f) reactor.run() But I don't see where to add an addErrback call. The important thing here is that I'm not getting the domains to look up on the command line or from the user. They are coming in over a socket from, say, dig. So I'm trying to avoid parsing those queries myself since the full DNS query protocol is hefty; that is, I want twisted to do the work of the parsing the input. Thanks for your help. -Broder
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