Pidgin dns query issues (xmpp)

[Ethan Blanton]

Lantern spake unto us the following wisdom:
> I've been having an issue with dns resolution in pidgin. I've got an isolated
> LAN with three RHEL5 boxes. They have the following ip addresses and
> functions:
> 
> 10.52.0.34: dns server (BIND9), mysql database, pidgin client
> 10.52.0.35: pidgin client, openfire jabber server
> 10.52.0.36: pidgin client
> 
> On 34, I've set "example.com" to resolve to 10.52.0.34, and I've set the dns
> server on all three boxes to be 34 as well. Pinging "example.com" returns 34
> on each box, and a small c program I've written resolves example.com to be
> 34 via the getaddrinfo function. However, I am having the following issue
> with pidgin:

Is your description here correct?  You claim that .34 is example.com,
but that the openfire server is running on .35, and that XMPP
connections to example.com correctly locate the openfire server.  Are
you using SRV records?

> When I register a user with the domain "example.com," the process is
> successful, and when I view active sessions in openfire, the user shows up
> on the list. However, when I register 2 users on 2 different machines, and
> then I try to send chat messages between them via the "example.com" domain,
> the messages are not received either way. Furthermore, when I try to add the
> other as a buddy via the "example.com" domain, the authorization process is
> never shown to take place on the other end.
> 
> Both message sending and buddy-adding is successful when I specify the
> actual ip address 10.52.0.34 as the domain.
> 
> I've been looking through \pidgin-2.1.0\libpurple\dnsquery.{c, h} in order
> to see how the dns query works, but nothing stands out to me as code that
> would prevent proper dns resolution only for sending messages. Is anyone
> familiar with this problem, and can anyone advise me on my issue?

The debug output from Pidgin might be illuminating (via the debug
window, or the output of pidgin -d), as might a packet dump
(particularly if you are not using SSL, or if you can turn SSL off for
testing).

Ethan

-- 
The laws that forbid the carrying of arms are laws [that have no remedy
for evils].  They disarm only those who are neither inclined nor
determined to commit crimes.
		-- Cesare Beccaria, "On Crimes and Punishments", 1764
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