viktor, i don't disagree with your goals, but i have a proposal as to
method.
no resolver should be sending single-label names in DNS requests, period.
search list processing should not be applied to the "localhost" single
label name, ever.
operating system lookups like gethostbyname() or similar, that are
willing to look at the /etc/hosts or local equivalent, should be willing
to discover any entry, even single-label names such as "localhost".
if there is no /etc/hosts or similar that can contain something like the
"localhost" name, then the operating system library (gethostbyname or
similar) ought to translate this to ::1 (or 127.0.0.1) in hard code.
in other words there is no situation in which NXDOMAIN should be
encountered for the "localhost" name, because no query should ever be
sent. and that's mostly true today. localhost is getting returned due to
search list processing, when it's returned by DNS at all.
because i don't think outlawing the name in an RDNS responder is the
right place for this logic, nor that these responders are likely to be
updated soon, nor that an operator of such a server will decide that
implementing this change is in their best interests (wrt help desk calls.)
paul
_______________________________________________
DNSOP mailing list
DNSOP@ietf.org
https://www.ietf.org/mailman/listinfo/dnsop
