IETF Logo Mail Archive

Re: [DNSOP] Risk of using underscores for sentinel (Was: A conversational description of sentinel.

Vladimír Čunát <vladimir.cunat+ietf@nic.cz> Mon, 12 February 2018 15:25 UTC

Return-Path: <vladimir.cunat@nic.cz>
X-Original-To: dnsop@ietfa.amsl.com
Delivered-To: dnsop@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E108812D779 for <dnsop@ietfa.amsl.com>; Mon, 12 Feb 2018 07:25:27 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -7.03
X-Spam-Level:
X-Spam-Status: No, score=-7.03 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=nic.cz
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 4e0bp8JxPvM0 for <dnsop@ietfa.amsl.com>; Mon, 12 Feb 2018 07:25:26 -0800 (PST)
Received: from mail.nic.cz (mail.nic.cz [217.31.204.67]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 402A312D0C3 for <dnsop@ietf.org>; Mon, 12 Feb 2018 07:25:25 -0800 (PST)
Received: from [IPv6:2001:1488:fffe:6:8820:dff:fe0d:23c6] (unknown [IPv6:2001:1488:fffe:6:8820:dff:fe0d:23c6]) by mail.nic.cz (Postfix) with ESMTPSA id 2BF1E61F61 for <dnsop@ietf.org>; Mon, 12 Feb 2018 16:25:23 +0100 (CET)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=nic.cz; s=default; t=1518449123; bh=Zed+6x7BcdLZ+X2Dp+FW4l/TKuPkDwbwk/GwC0+MRJ4=; h=To:From:Date; b=VNk2Jl48Xqan25I6ANjl31hF1HXdCBxLOs0k1LBJH+WQ3rtntt1xgTvoKGwRQrXsZ AH7YfISTmxmGDlyhYRXXO/N/rosuuHprlM8fFdELp9z5Pjnb3987hLTuur1W8gSY5T Xw5/ALLUPhG32umtkrQrQwBCbgrR9Cs/iuBy54Uw=
To: dnsop@ietf.org
References: <74C0CA59-6D53-4A60-ACBA-4AF5B51FE3FF@apnic.net> <D5D013D4-1EAD-434B-863A-29CB1BBEF4E4@vpnc.org> <496EFA88-BA70-460B-BFB2-69B2C7BC905D@apnic.net> <4540A279-4A37-4245-AE61-BEE5342E3F72@vpnc.org> <20180202075530.Horde.UWaxe9eenZ7PyxWYFHCFGdN@andreasschulze.de> <e8ac7bd0-26e6-cf97-e2ef-0ead50dc18ce@nic.cz> <88E7D27C-048E-44CB-B317-C892EA603D31@isc.org> <0c2a4a38-49d7-2b46-1ac8-1dda0812e217@nic.cz> <CAHw9_iJ6yL12OaGW5+fm8M3YUkrj46CvC2-ob7Xrc5HEaA_Z1Q@mail.gmail.com> <6acdf6cc-965d-f126-a8f7-eb74b9164f07@nic.cz> <20180212112820.jt3qqsl5pm3r7qf4@nic.fr>
From: Vladimír Čunát <vladimir.cunat+ietf@nic.cz>
Message-ID: <817fe2fa-98ae-9077-4d8c-22fc0b39412a@nic.cz>
Date: Mon, 12 Feb 2018 16:25:23 +0100
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0
MIME-Version: 1.0
In-Reply-To: <20180212112820.jt3qqsl5pm3r7qf4@nic.fr>
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 8bit
Content-Language: en-US
X-Virus-Scanned: clamav-milter 0.99.2 at mail
X-Virus-Status: Clean
Archived-At: <https://mailarchive.ietf.org/arch/msg/dnsop/5CUxxuhHoayDvzColc4UEAw9Ycw>
Subject: Re: [DNSOP] Risk of using underscores for sentinel (Was: A conversational description of sentinel.
X-BeenThere: dnsop@ietf.org
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: IETF DNSOP WG mailing list <dnsop.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/dnsop>, <mailto:dnsop-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/dnsop/>
List-Post: <mailto:dnsop@ietf.org>
List-Help: <mailto:dnsop-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/dnsop>, <mailto:dnsop-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 12 Feb 2018 15:25:28 -0000

On 02/12/2018 12:28 PM, Stephane Bortzmeyer wrote:
>> Current Firefox 58.0.1 and old Chromium 61.0.3163.79, Linux, same
>> result.  The system resolver does fetch _www.ksk-test.net. OK.  (I
>> can't say I understand what happens.)
> Isn't is simply because some browsers rely on the standard library's
> getaddrinfo() and this routine does not accept all domain names? On Linux:

Right, that's most likely the problem.  IIRC Firefox uses getaddrinfo
for DNS, at least on Linux.  Even if we discount Firefox, it would seem
better to choose names compatible with glibc's getaddrinfo.

--Vladimir

v2.23.0 | Report a Bug | By Email