On Tue, 20 Mar 2007 16:13:14 -0700, Sean Leach wrote:

Thanks Jean-Paul,

I tried changing to queryUDP, and it just sits there, never sends out a query (watching with tcpdump). If I change it to _lookup, which it looks like queryUDP calls, it sends the query, but like lookupAddress, I don't get the additional and auth sections still...

What is weird, when I do this

deferred = resolver.queryUDP([Dns.Query(name, dns.IN, dns.A)])

and I try and debug why it's hanging, I put a print in the ResolverBase.queryUDP function right at the top, and it never prints.

The factoring here is a little weird. Try creating a t.names.client.Resolver explicitly (just instantiate it with a servers list or a resolv.conf filename) and calling queryUDP on it (unless you were doing this already). The createResolver function does some other stuff which might be getting in the way here, either of functioning or debugging. Here's an example (using t/conch/stdio.py):

...

...

from twisted.names import dns, client r = client.Resolver(servers=[('198.41.0.4', 53)]) d = r.queryUDP([dns.Query('google.com', dns.IN, dns.A)]) d > d.result d.result.authority [] d.result.additional [] d.result.answers []

Hope this helps things, Jean-Paul

Ok...ignore my last post, jumped the gun, the additional and authority still don't exist in the result object. In addition, I tried your example to make sure I wasn't crazy, and it doesn't return any result data. I know it's not a network issue or anything silly as I can query a.root fine with dig and get the results. Here is the session: $ cat test.py #!/usr/bin/python2.4 import time from twisted.names import dns, client, _version print _version.version def errorHandler(error): print str(error) r = client.Resolver(servers=[('198.41.0.4', 53)]) d = r.queryUDP([dns.Query('google.com', dns.IN, dns.A)]).addErrback(errorHandler) time.sleep(5) ## give it a time for shitz and giggles print d print d.result $ ./test.py [twisted.names, version 0.4.0] Traceback (most recent call last): File "./test.py", line 10, in ? print d.result AttributeError: Deferred instance has no attribute 'result' On 3/20/07, Sean Leach wrote:

Sweet! That was it. Explicitly creating the Resolver worked like a charm (don't ask me why :) ). Thanks!

On 3/20/07, Jean-Paul Calderone wrote:

...

On Tue, 20 Mar 2007 16:13:14 -0700, Sean Leach wrote:

...

Thanks Jean-Paul,

I tried changing to queryUDP, and it just sits there, never sends out a query (watching with tcpdump). If I change it to _lookup, which it looks like queryUDP calls, it sends the query, but like lookupAddress, I don't get the additional and auth sections still...

What is weird, when I do this

deferred = resolver.queryUDP([Dns.Query(name, dns.IN, dns.A)])

and I try and debug why it's hanging, I put a print in the ResolverBase.queryUDP function right at the top, and it never prints.

The factoring here is a little weird. Try creating a t.names.client.Resolver explicitly (just instantiate it with a servers list or a resolv.conf filename) and calling queryUDP on it (unless you were doing this already). The createResolver function does some other stuff which might be getting in the way here, either of functioning or debugging.

Here's an example (using t/conch/stdio.py):

...

...

...

from twisted.names import dns, client r = client.Resolver(servers=[('198.41.0.4', 53)]) d = r.queryUDP([dns.Query('google.com', dns.IN, dns.A)]) d > d.result d.result.authority [] d.result.additional [] d.result.answers []

Hope this helps things,

Jean-Paul

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Yes - I know, this was a small example program to show the problem I was seeing. And I have read over all of the documentation, including the Twisted.names source. On 3/21/07, Thomas Hervé wrote:

Quoting Sean Leach :

...

Ok...ignore my last post, jumped the gun, the additional and authority still don't exist in the result object. In addition, I tried your example to make sure I wasn't crazy, and it doesn't return any result data. I know it's not a network issue or anything silly as I can query a.root fine with dig and get the results. Here is the session:

$ cat test.py #!/usr/bin/python2.4 import time from twisted.names import dns, client, _version print _version.version def errorHandler(error): print str(error) r = client.Resolver(servers=[('198.41.0.4', 53)]) d = r.queryUDP([dns.Query('google.com', dns.IN, dns.A)]).addErrback(errorHandler) time.sleep(5) ## give it a time for shitz and giggles print d print d.result

I *think* you're missing something about Twisted. You should start the reactor to have something, and *never* use time.sleep inside a Twisted program.

You could start with reading the documentation here: http://twistedmatrix.com/projects/core/documentation/howto/async.html.

-- Thomas

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On Wed, 21 Mar 2007 05:31:08 -0700, Sean Leach wrote:

Yes - I know, this was a small example program to show the problem I was seeing. And I have read over all of the documentation, including the Twisted.names source.

The example I gave might have been a bit confusing. I was using a shell that has the reactor running already, so I didn't need to start it. The equivalent as a normal Twisted program would be something like: #!/usr/bin/python2.4 import time from twisted.names import dns, client, _version from twisted.internet import reactor def errorHandler(error): print str(error) def gotMessage(message): print message.answers print message.additional print message.authority r = client.Resolver(servers=[('198.41.0.4', 53)]) d = r.queryUDP([ dns.Query('google.com', dns.IN, dns.A)]) d.addErrback(errorHandler) d.addCallback(gotMessage) reactor.run() Jean-Paul