XMPP, Connect Server, and SRV

Peter Saint-Andre stpeter at stpeter.im
Mon Oct 13 18:50:05 EDT 2008

Mark Doliner wrote:
> On Thu, Sep 18, 2008 at 7:49 PM, Evan Schoenberg <evan.s at dreskin.net> wrote:
>> On Sep 18, 2008, at 11:35 AM, Peter Saint-Andre <stpeter at stpeter.im> wrote:
>>> Peter Saint-Andre wrote:
>>>> Ethan Blanton wrote:
>>>>> Bron Gondwana spake unto us the following wisdom:
>>>>>> My idea of the correct behaviour is:
>>>>>> a) if an explicit server name is specified, use that always
>>>>>> b) otherwise, lookup up the _jabber._tcp or _xmpp-client._tcp for
>>>>>> the
>>>>>>   domain part of the username.
>>>>>> c) finally, try the A record for the domain part.
>>>>> I'm pretty sure this is the *current* behavior, unless I
>>>>> misunderstand
>>>>> you.
>>>> Hmm, it seems that I don't have a) captured in the specs yet:
>>>> http://www.xmpp.org/internet-drafts/draft-saintandre-rfc3920bis-06.html#tcp-resolution
>>> OK, I just added the following text to my working copy:
>>>   Note: If the initiating entity has been explicitly configured to
>>>   associate a particular hostname (and potentially port) with the
>>>   original hostname of the receiving entity (say, to "hardcode" an
>>>   association between an original hostname of example.net and a
>>>   configured hostname and of webcm.example.com:80), the initiating
>>>   entity SHALL use the configured name instead of the original name
>>>   when following the resolution process described above.
>>> Does that explain scenario (a) more clearly?
>> I remain unclear on whether an SRV lookup should be performed using
>> the "overridden" server or not.
> Sorry to bring up an old thread, I just happened to be looking at it.
> No, I do not think an SRV lookup should be performed when the
> "overridden" server is used.  The "connect server" field is an
> alternative to using DNS SRV records.  And it should really only be
> used at times when the DNS SRV record can't be used for whatever
> reason.

I agree. If you did SRV lookups on the SRV lookups, you could get into
an infinite regress. :)


Peter Saint-Andre

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