Re: [netmod] rfc6991bis: inet:host

Ladislav Lhotka <ladislav.lhotka@nic.cz> Thu, 30 July 2020 14:03 UTC

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From: Ladislav Lhotka <ladislav.lhotka@nic.cz>
References: <20200722110030.6c7r6utxgjbsilkq@anna.jacobs.jacobs-university.de> <ff42e4cb-957c-a4f0-a88b-333a6565ed8e@nic.cz> <20200724083617.u3wkr34ehjezmusq@anna.jacobs.jacobs-university.de> <87a6zmifpo.fsf@nic.cz> <20200726202427.oqythl6sggm4uzxe@anna.jacobs.jacobs-university.de> <87wo2p8hnw.fsf@nic.cz> <20200727104412.jxgocoaxi2u6pula@anna.jacobs.jacobs-university.de> <2521f17d-c105-503a-1fc6-4f3ecaf6e58b@nic.cz> <20200728151033.wdjojzrlffh6sebu@anna.jacobs.jacobs-university.de> <87o8nyh6x1.fsf@nic.cz> <20200730134404.5w7lubdccjmkjcfe@anna.jacobs.jacobs-university.de>
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Date: Thu, 30 Jul 2020 16:02:57 +0200
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Archived-At: <https://mailarchive.ietf.org/arch/msg/netmod/rVbthrrbBtj9mjFfzDH6GA2ne6E>
Subject: Re: [netmod] rfc6991bis: inet:host
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On 30. 07. 20 15:44, Juergen Schoenwaelder wrote:
> 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?

Yes, that was my idea. If IDN becomes widespread (ever), the "idn-host"
version would be much easier to use.

Lada

> 
>> 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
> 

-- 
Ladislav Lhotka
Head, CZ.NIC Labs
PGP Key ID: 0xB8F92B08A9F76C67