On Tue, 2 May 2006, Dave Cridland wrote:
On Sun Apr 30 14:16:57 2006, Bruce Campbell wrote:
Both of these documents also refer to DNS-SRV (rfc2781), which states that
if the target of the sole (successful) SRV answer is the root domain ('.'),
then 'abort'.
You mean RFC2782, which states that 'A Target of "." means that the service
is decidedly not available at the domain.' - later, in the description of how
to use SRV records, it merely says 'abort'.
This means your interpretation must be correct - sort of. The server could
lookup records in _simple.example.com, for instance, if it were capable of
gatewaying to SIMPLE, but no server to server XMPP service is available.
Something that struck me over the course of today, is that although a
(sole) target of '.' means 'not available', and imho, 'stop completely',
it could be argued that since XMPP-IM encourages SRV lookup chains, it
might be permissible to continue with looking up
_im._xmpp.example.com/_pres._xmpp.example.com , depending on whether you
view generic server-to-server XMPP as being different from
message-or-presence-server-to-server XMPP.
Definitely it's wrong to resolve example.com and try randomly connecting to
it - not only wrong, but arguably illegal, since you've been explicitly told
there is no such service at the domain.
Agreed, but enforcement is another matter.
--
Bruce Campbell
