Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-svcb-https-05.txt

Paul Wouters <paul@nohats.ca> Thu, 20 May 2021 01:52 UTC

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Date: Wed, 19 May 2021 21:52:10 -0400 (EDT)
From: Paul Wouters <paul@nohats.ca>
To: Ben Schwartz <bemasc=40google.com@dmarc.ietf.org>
cc: dnsop <dnsop@ietf.org>
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Subject: Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-svcb-https-05.txt
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On Wed, 19 May 2021, Ben Schwartz wrote:

> So long as there are no registered protocol identifiers containing "," or "\\", zone file implementations MAY
> disallow these characters instead of implementing the `value-list` escaping procedure.

Sorry, an implementor cannot predict the future of the IANA registry. They
can't write code to confirm to this requirement other than NOT allowing
the MAY.

Even if they were silly enough to _first_ check the IANA registry before
parsing SVCB records, they would still have to write all the the parsing
code without CVE's for both cases, just in case the IANA registry would
gain these characters in the future.

Paul