Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-svcb-https-05.txt
Erik Nygren <erik+ietf@nygren.org> Wed, 19 May 2021 21:36 UTC
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References: <7ADF1FB2-97A4-4C49-8F25-8BF03BE01640@hopcount.ca> <20210512213903.D5F1F7AA827@ary.qy> <CAMOjQcFJjcsvaREF0fr+2GTY4zTy5CxSxR16BEp=Nc-K9WJ0Tg@mail.gmail.com> <CAH1iCipAVKVCuH2ME=+YpeJyijrKCtzJaU3bRFyy1f48EB33iw@mail.gmail.com> <CAHbrMsCjWgV7nc575L_qdvr7HdoEVKqkXRwLdXA2L5NiCgdvwA@mail.gmail.com> <CAH1iCipW_-BSMQZ-S+m18pyzfxTGsCrmG9Pc-b35_VRiLhxh4w@mail.gmail.com> <CAHbrMsDvEkYAxee4xjW5LsQmr0PgBf+UmMAuME-_UvRMg4jJeA@mail.gmail.com> <CAH1iCiq4zJZBv5=f7T2EDRWKa7bAZx66SMKkf+AiDsDPTZokhQ@mail.gmail.com> <CAHbrMsAW_wtKmRDYKZVUrFLZYuM_DqoS-8VRMf-O0Z8WpPBfbg@mail.gmail.com> <CAKC-DJj3nPAZp=qpwjBJ_3yG_EO-q-bcJbaizUNw9uq6deVZjg@mail.gmail.com> <C3734365-D5F7-4F9A-A463-5EFBB841A583@apple.com> <CAH1iCiod61M5aHnF_qrpP6=Oc3nBL+McaSui5NUnLd1GbS=okw@mail.gmail.com> <F3056314-6C0A-43A9-957B-5987FD1FCE0F@apple.com>
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From: Erik Nygren <erik+ietf@nygren.org>
Date: Wed, 19 May 2021 17:36:24 -0400
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To: Tommy Pauly <tpauly@apple.com>
Cc: Brian Dickson <brian.peter.dickson@gmail.com>, dnsop <dnsop@ietf.org>, Ben Schwartz <bemasc=40google.com@dmarc.ietf.org>, John Levine <johnl@taugh.com>, Eric Orth <ericorth=40google.com@dmarc.ietf.org>, Joe Abley <jabley@hopcount.ca>
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Subject: Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-svcb-https-05.txt
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On Wed, May 19, 2021 at 5:12 PM Tommy Pauly <tpauly@apple.com> wrote: > > > On May 19, 2021, at 1:34 PM, Brian Dickson <brian.peter.dickson@gmail.com> > wrote: > > > > On Wed, May 19, 2021 at 7:49 AM Tommy Pauly <tpauly@apple.com> wrote: > >> I wanted to chime in on this discussion as a client-side implementor who >> has already widely deployed support for SVCB/HTTPS. >> >> The current format, where the parameters are structured as a list within >> a single RR, is certainly simpler and less error prone for processing. Much >> of the information contained as parameters within the SVCB RR are useful >> for higher-level “application” logic. Within our deployment, the DNS stub >> resolver daemon receives the RR and does the parsing, and passes up the >> parameters bundle as a blob that is more or less opaque, to the layer that >> handles actual connection processing (doing happy eyeballs, protocol >> selection). >> >> Processing the content of SVCB parameters must be handled atomically: the >> ALPN, ECH config, and any other information must be handled clearly as a >> unit and not have any chance of being broken up. Lots of code is already >> based on processing RRs as chunks of data, and requiring anyone looking at >> the information to stitch the parameter list back together based on >> multiple RRs that must be in a particular order adds complexity and invites >> in bugs and errors. >> >> I’d strongly encourage sticking with the wire image we’ve already been >> using and deploying. >> > > Would it be accurate to say that as long as the wire format of both SVCB > and HTTPS do not change, your client implementation(s) would not be > impacted by any changes to zone file format? > > > I.e. you don't implement any server code, so what the zone format is does > not affect you, and how the wire format gets produced from the zone format > is not relevant to you? > > > That’s correct. My main concern here is keeping the wire format consistent > and simple. How the zone format file works is indeed something separate, > and not something I have strong opinions on. Anything we can do to make the > processing simple for both sides is great. > > Also as I understand it, changes that substantially change the semantics of the records but preserving the presentation format and wire format would also affect you? In particular, any shift from a RR-per-service-binding to having service bindings span RRs in the RRset would add significant complexity to your client implementation as you've described? Separately I've opened https://github.com/MikeBishop/dns-alt-svc/issues/324 to explore if there are ways we can simplify through character set constraints. In-particular, if we could get ALPN constrained to a set of token characters (and similarly constrain future SvcParams that want to be value lists to use a limited subset of characters) then some of the parsing concerns get simpler. I've mailed the TLS WG as they may not be willing to change how ALPN registry entries are handled in which case we'd still need a solution here. Best, Erik
- [DNSOP] I-D Action: draft-ietf-dnsop-svcb-https-0… internet-drafts
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Ben Schwartz
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Wellington, Brian
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Ben Schwartz
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Petr Špaček
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Wellington, Brian
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Ben Schwartz
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Wellington, Brian
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Ben Schwartz
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Wellington, Brian
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Hoffman
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tim Wicinski
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tom
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Pieter Lexis
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tim Wicinski
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Hoffman
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Wouters
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Hoffman
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Pieter Lexis
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Pieter Lexis
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Pieter Lexis
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Peter van Dijk
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Wouters
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Wouters
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Hoffman
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Stephen Farrell
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Hoffman
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- [DNSOP] ZONEMD was Re: [Ext] I-D Action: draft-ie… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… libor.peltan
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Vladimír Čunát
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] ZONEMD was Re: [Ext] I-D Action: draf… Wessels, Duane
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… libor.peltan
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] ZONEMD was Re: [Ext] I-D Action: draf… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Peter van Dijk
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Eric Orth
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Eric Orth
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Eric Orth
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… John Levine
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Eric Orth
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… John R Levine
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… libor.peltan
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Eric Orth
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… John R Levine
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… John R Levine
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… John Levine
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Erik Nygren
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Erik Nygren
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Wouters
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tommy Pauly
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tommy Pauly
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Erik Nygren
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Hoffman
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tommy Pauly
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Eric Orth
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Erik Nygren
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Martin Thomson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Wouters
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Martin Thomson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Wouters
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Martin Thomson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tim Wicinski
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ralf Weber
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Eric Orth
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ralf Weber
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tim Wicinski
- [DNSOP] Sub-field encoding scheme discussion (pos… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Hoffman
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ralf Weber
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz