IETF Logo Mail Archive

Re: [Doh] [Ext] A question on the mix of DNS and HTTP semantics

Andrew Sullivan <ajs@anvilwalrusden.com> Mon, 19 March 2018 15:22 UTC

Return-Path: <ajs@anvilwalrusden.com>
X-Original-To: doh@ietfa.amsl.com
Delivered-To: doh@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 375A9129C56 for <doh@ietfa.amsl.com>; Mon, 19 Mar 2018 08:22:04 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.9
X-Spam-Level:
X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=yitter.info header.b=KL8di3gP; dkim=pass (1024-bit key) header.d=yitter.info header.b=ZohxQ7ex
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zThKYRw4GaEc for <doh@ietfa.amsl.com>; Mon, 19 Mar 2018 08:22:03 -0700 (PDT)
Received: from mx4.yitter.info (mx4.yitter.info [159.203.56.111]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E288F127873 for <doh@ietf.org>; Mon, 19 Mar 2018 08:22:02 -0700 (PDT)
Received: from localhost (localhost [127.0.0.1]) by mx4.yitter.info (Postfix) with ESMTP id 35D03BE780 for <doh@ietf.org>; Mon, 19 Mar 2018 15:21:32 +0000 (UTC)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yitter.info; s=default; t=1521472892; bh=FtMvgt7atvbqiDg09f4fpelPsfwLq3PLNF2ue4HsdfU=; h=Date:From:To:Subject:References:In-Reply-To:From; b=KL8di3gP607tYwy8PqMGcp6jt2+nFvjc/TsEBcOUSRg2SfGV7CiFq8csQWuPHD++v MXeyEgqiElzQOUPIxA6wr+qmyTtuUhOo34khH8/+OmcV6LFibnCKgBq6uLKU8OoRZf BX2uwKkYFgJbbMjHeGr1iDBLyelaoARXck0RvU2Y=
X-Virus-Scanned: Debian amavisd-new at crankycanuck.ca
Received: from mx4.yitter.info ([127.0.0.1]) by localhost (mx4.yitter.info [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id EmiqrX_JQRZt for <doh@ietf.org>; Mon, 19 Mar 2018 15:21:31 +0000 (UTC)
Date: Mon, 19 Mar 2018 11:21:27 -0400
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yitter.info; s=default; t=1521472891; bh=FtMvgt7atvbqiDg09f4fpelPsfwLq3PLNF2ue4HsdfU=; h=Date:From:To:Subject:References:In-Reply-To:From; b=ZohxQ7ex7Z7Ql8bAGH6sVeOszi4gYfTxlEUpxtlcoJ4UNhQZCMdoTjyHZa//87EHc +ua5o8Kzv+rBOe/NBw8EzbI5eBGEoMtJsimamD3OGyBcmbBh7TNAW5kioWcQ+0qu/c on9xrx02k5gTMzsvcAcn+ZuNCaYZ493PfqIZobe0=
From: Andrew Sullivan <ajs@anvilwalrusden.com>
To: doh@ietf.org
Message-ID: <20180319152126.c5ylchfawn4syfwb@mx4.yitter.info>
References: <CA+9kkMB7awRfW9jUmY9Q-1p+w3VLtpG5DxhF3s7Q58nEMZeX3w@mail.gmail.com> <20180318164307.GB6724@laperouse.bortzmeyer.org> <CAOdDvNr1GstB+g3pYi4w0bXuQ=Nz8HqgTRfWUX9TGu9YAYiz0w@mail.gmail.com> <CA+9kkMA733q3BPRbnN++0vwKrmOOCN8SBgknYwFaeEf2cvYikw@mail.gmail.com> <88AB1743-7270-4D72-8C70-0AB6B74416BD@icann.org> <SN1PR08MB1854485BF319264F51D208C3DAD40@SN1PR08MB1854.namprd08.prod.outlook.com> <20180319150958.GA23411@laperouse.bortzmeyer.org>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Disposition: inline
In-Reply-To: <20180319150958.GA23411@laperouse.bortzmeyer.org>
Archived-At: <https://mailarchive.ietf.org/arch/msg/doh/Oo2vWaOfUfHBPeVaFOzSSrhBy9M>
Subject: Re: [Doh] [Ext] A question on the mix of DNS and HTTP semantics
X-BeenThere: doh@ietf.org
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: DNS Over HTTPS <doh.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/doh>, <mailto:doh-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/doh/>
List-Post: <mailto:doh@ietf.org>
List-Help: <mailto:doh-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/doh>, <mailto:doh-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 19 Mar 2018 15:22:04 -0000

On Mon, Mar 19, 2018 at 03:09:58PM +0000, Stephane Bortzmeyer wrote:
> On Mon, Mar 19, 2018 at 10:42:42AM +0000,
>  Mike Bishop <mbishop@evequefou.be> wrote 
>  a message of 24 lines which said:
> 
> > There's a reasonable argument that if Content-Type is
> > application/dns-udpwireformat, it should be processed by the DNS
> > client regardless of the HTTP status code.
> 
> It can be dangerous, no? If the status code is 500, it means there was
> a serious problem in the server, the content may be, for instance,
> truncated.

If it were actually truncated, wouldn't the message have a TC bit set?
If the message contained is short of the full UDP message, wouldn't
the client-side processor be able to tell because the counts of actual
RRs wouldn't match the header section counters?

Best regards,

A
-- 
Andrew Sullivan
ajs@anvilwalrusden.com

v2.23.0 | Report a Bug | By Email