Re: [netmod] rfc6991bis: inet:host

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Thu, 30 July 2020 13:44 UTC

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Date: Thu, 30 Jul 2020 15:44:04 +0200
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: netmod@ietf.org
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Subject: Re: [netmod] rfc6991bis: inet:host
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On Wed, Jul 29, 2020 at 01:55:38PM +0200, Ladislav Lhotka wrote:
> Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> writes:
> 
> >> If we want to allow non-ASCII names, then it would IMO be safer to use a
> >> type that expects straight Unicode for lexical representation and leave
> >> it to the implementations to convert to Punycode where necessary, e.g.
> >> when querying DNS.
> >
> > Perhaps. But I am not sure this is the time to fix this or how this
> > can be done in a backwards compatible way. At least this likely can't
> > be done by disallowing ACE. It may be possible to add an additional
> > member to the inet:host union that catches internationalized names.
> 
> I think it would be better to have an extra set of parallel definitions such as idn-domain-name, or perhaps u-domain-name.
>

So if we define idn-domain-name, what do we do with your hostname?
Have hostname derived from domain-name (as discussed before) with

     typedef host {
       type union {
         type inet:ip-address;
         type inet:host-name;
     }

and we add

     typedef idn-host {
       type union {
         type inet:ip-address;
         type inet:idn-hostname;
     }

and then YANG module writers can opt-in to use the new definition if
they want idn host names without requiring ACE encoding?

> Lada
> 
> > Since this would be enlarging the value space, I believe this is
> > inline with the spirit of section 11 of RFC 7950. Removing the ACE
> > names, however, restricts the value space and hence seem to contradict
> > section 11 of RFC 7950. (The explicit removal of underscore and single
> > letter hostnames may be considered a clarification since we have other
> > RFCs stating these constraints.)
> >
> > /js
> >
> > -- 
> > Juergen Schoenwaelder           Jacobs University Bremen gGmbH
> > Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
> > Fax:   +49 421 200 3103         <https://www.jacobs-university.de/>
> 
> -- 
> Ladislav Lhotka 
> Head, CZ.NIC Labs
> PGP Key ID: 0xB8F92B08A9F76C67

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
Fax:   +49 421 200 3103         <https://www.jacobs-university.de/>