Re: I-D Action: draft-carpenter-6man-rfc6874bis-00.txt

Brian E Carpenter <brian.e.carpenter@gmail.com> Wed, 07 July 2021 02:44 UTC

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Subject: Re: I-D Action: draft-carpenter-6man-rfc6874bis-00.txt
To: Nico Schottelius <nico.schottelius@ungleich.ch>, Andrew Cady <andy@cryptonomic.net>
Cc: ipv6@ietf.org
References: <162545101341.19246.8566193740265797873@ietfa.amsl.com> <95a7dbe5-e0a3-4676-9dcc-005ff53725e0@gmail.com> <CA+9kkMD3iSgo-KMM5Ed8bVnVCu_G3f2kB6zHKoOx2ta=x8QucA@mail.gmail.com> <CANMZLAbmdWHDRBPpHgy_e4_0-WUVW2gjnbXWwu2pF_xi-S0vWQ@mail.gmail.com> <87a6n13y0j.fsf@ungleich.ch> <CA+9kkMBx4F0FGZasdk11ogyCOwQZecAEkO4JbECDr4osySN-4w@mail.gmail.com> <20210706152527.j47rcxas5nwz5d63@zukertort.childrenofmay.org> <871r8bl3pq.fsf@ungleich.ch>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Message-ID: <da63ec9e-025b-bfec-a352-20a613885b2d@gmail.com>
Date: Wed, 7 Jul 2021 14:44:37 +1200
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Nico,
On 07-Jul-21 06:03, Nico Schottelius wrote:
> 
> Andrew Cady <andy@cryptonomic.net> writes:
>> Please remember two facts and a corollary that I posted here last week:
>>
>>   1.  RFC3986 says percent-decoding is done AFTER parsing into components
>>       and subcomponents
>>
>>   2.  The IPv6 literal subcomponent is NOT percent-encoded.
>>
>>   2a. No percent-decoding is done (or allowed) on this parsed subcomponent.
>>
>> (Ref:<https://mailarchive.ietf.org/arch/msg/ipv6/FPLeDZXqJ1zwE1yF_Qkh7Ldq120/>)
> 
> I've skimmed RFC3986 and have a bit of trouble reading it - and maybe
> that's also the reason why browser developers had trouble properly
> implementing it.
> 
> For me the three statements from Andrew are well readable and
> understandable.
> 
> Would it by any chance be easier to create a specific RFC
> "Parsing of IPv6 literal addresses in URIs"
> that basically re-iterates the three sentences above and maybe even
> includes a parser description?

I would think that *when* we have agreed on a definitive solution,
we should add that text as an appendix to rfc6874bis.

> They are well reasoned, easy to understand and easy to implement. Given
> that we add a "reference parser", which could even be a regexp,
> developers might be able to "copy and paste" the parser into their code
> (+/- language bindings).

I think the browser implementers know their business better than 6MAN does,
but having a sample implementation is never a bad thing.

Regards
   Brian