Re: [DNSOP] WGLC for draft-ietf-dnsop-let-localhost-be-localhost-02

> On 25 Jan 2018, at 8:38 am, Paul Vixie <paul@redbarn.org> wrote:
> 
> 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.

I would qualify that as gethostbyaddr / getaddrinfo etc. should not be ….

Resolvers do more than lookup host names.

> 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

> 
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Mark Andrews, ISC
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