udns returns DNS_E_NXDOMAIN when domain exists but SRV records does not exist

[Iñaki Baz Castillo]

2011/6/21  <mjt at corpit.ru>:
>> It's not an error in udns. I've captured DNS traces and indeed, even
>> Google DNS replies "0011 = Reply code: No such name (3)". So, is it a
>> bug in DNS protocol? :)
>
> I think it's a bug in your expectations.  SRV records were invented
> long after DNS appeared, and SRV uses existing DNS infrastructure
> unchanged.  How to interpret the result is a question for the app
> that uses SRV records.

Yes, but if a DNS server implements SRV, what does prevent it to reply
"NODATA" instead of "NXDOMAIN" (in case the *domain* does exist)?
The queried domain is specified in the SRV query (i.e:
"_sip._udp.lalala.somedomain.org" means that queried service is "sip",
protocol "udp" and domain "lalala.somedomain.org"). So a DNS
authoritative for lalala.somedomain.org should be able to reply
"NXDOMAIN" rather than "NXDOMAIN". I see no reason, neither
limitation, for replying "NXDOMAIN".


-- 
Iñaki Baz Castillo
<ibc at aliax.net>