Re: [netmod] rfc6991bis: inet:host
Ladislav Lhotka <ladislav.lhotka@nic.cz> Sun, 26 July 2020 13:11 UTC
Return-Path: <ladislav.lhotka@nic.cz>
X-Original-To: netmod@ietfa.amsl.com
Delivered-To: netmod@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A9DBF3A0E74 for <netmod@ietfa.amsl.com>; Sun, 26 Jul 2020 06:11:44 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.897
X-Spam-Level:
X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
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 r-Q2NhOGWOnH for <netmod@ietfa.amsl.com>; Sun, 26 Jul 2020 06:11:41 -0700 (PDT)
Received: from trail.lhotka.name (trail.lhotka.name [77.48.224.143]) by ietfa.amsl.com (Postfix) with ESMTP id 7BDF73A0E73 for <netmod@ietf.org>; Sun, 26 Jul 2020 06:11:40 -0700 (PDT)
Received: by trail.lhotka.name (Postfix, from userid 109) id 887AE8600CA; Sun, 26 Jul 2020 15:02:54 +0200 (CEST)
Received: from localhost (unknown [172.29.2.111]) by trail.lhotka.name (Postfix) with ESMTPSA id EC54C860083; Sun, 26 Jul 2020 15:02:31 +0200 (CEST)
From: Ladislav Lhotka <ladislav.lhotka@nic.cz>
To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
Cc: tom petch <ietfc@btconnect.com>, "netmod@ietf.org" <netmod@ietf.org>
In-Reply-To: <20200724083617.u3wkr34ehjezmusq@anna.jacobs.jacobs-university.de>
References: <20200717191717.u5a3wv4nbajjdcaj@anna.jacobs.jacobs-university.de> <87ft9mzhe0.fsf@nic.cz> <20200721194434.pvekzgxaus43iihg@anna.jacobs.jacobs-university.de> <AM7PR07MB62482ED4917241DBCD08E7B7A0790@AM7PR07MB6248.eurprd07.prod.outlook.com> <20200722110030.6c7r6utxgjbsilkq@anna.jacobs.jacobs-university.de> <ff42e4cb-957c-a4f0-a88b-333a6565ed8e@nic.cz> <20200724083617.u3wkr34ehjezmusq@anna.jacobs.jacobs-university.de>
Mail-Followup-To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>, tom petch <ietfc@btconnect.com>, "netmod\@ietf.org" <netmod@ietf.org>
Date: Sun, 26 Jul 2020 15:11:15 +0200
Message-ID: <87a6zmifpo.fsf@nic.cz>
MIME-Version: 1.0
Content-Type: text/plain
Archived-At: <https://mailarchive.ietf.org/arch/msg/netmod/EkvQmnGUj7eVM-pKfx3vqnXzdjI>
Subject: Re: [netmod] rfc6991bis: inet:host
X-BeenThere: netmod@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: NETMOD WG list <netmod.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/netmod>, <mailto:netmod-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/netmod/>
List-Post: <mailto:netmod@ietf.org>
List-Help: <mailto:netmod-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/netmod>, <mailto:netmod-request@ietf.org?subject=subscribe>
X-List-Received-Date: Sun, 26 Jul 2020 13:11:45 -0000
Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> writes: > On Wed, Jul 22, 2020 at 01:46:38PM +0200, Ladislav Lhotka wrote: >> >> >> On 22. 07. 20 13:00, Juergen Schoenwaelder wrote: >> > Tom, >> > >> > my understanding is that Lada is now proposing something slightly >> > different but I am not sure what exactly, hence I asked again. >> >> Oh yes, I messed it up by mixing different things together, sorry. I >> checked again the ML archive, and the message that is relevant to this >> thread is this: >> >> https://mailarchive.ietf.org/arch/msg/netmod/PISOifrtow4oWLGW7meBBSri7nM/ >> >> The aim of that proposal was to limit the "inet:host" type to DNS names >> that are reasonable as host names, i.e. eliminate values like "." or "_". > > You are proposing to change the length restriction from 1..253 to > 2..253 following RFC 952: > > [...] Single character names > or nicknames are not allowed. > > And you add > > pattern '(.*\.)?..\-\-.*' { > modifier invert-match; > } > > to restrict things to non-reserved letter-digit-hyphen labels as per > RFC 5890. Is it clear that this second restriction applies to host > names? How do you represent internationalized host names? Perhaps we > need a collection of examples? And is the pattern correct? RFC 5890 > says: > > Reserved LDH labels, known as "tagged domain names" in some other > contexts, have the property that they contain "--" in the third and > fourth characters but which otherwise conform to LDH label rules. > > What is the '(.*\.)?' part doing in your pattern? > > Finally, would it be useful to derive a host-name type from the > domain-name type (if host-names are really a strict subset of what > domain-name allows), e.g.: The current definition of "inet:domain-name" in 6991bis also permits the underscore character in labels, so it is not LDH. Lada > > typedef host-name { > type domain-name { > pattern '(.*\.)?..\-\-.*' { > modifier invert-match; > } > length "2..max"; > } > description > "Host names must be at least two characters long (see RFC 952) > and they are restricted to non-reserved letter-digit-hyphen > (NR-LDH) labels (see RFC ????)."; > reference > "RFC 952: DoD Internet Host Table Specification > RFC ????: ????"; > } > > /js > > -- > Juergen Schoenwaelder Jacobs University Bremen gGmbH > Phone: +49 421 200 3587 Campus Ring 1 | 28759 Bremen | Germany > Fax: +49 421 200 3103 <https://www.jacobs-university.de/> -- Ladislav Lhotka Head, CZ.NIC Labs PGP Key ID: 0xB8F92B08A9F76C67
- [netmod] rfc6991bis: inet:host Juergen Schoenwaelder
- Re: [netmod] rfc6991bis: inet:host tom petch
- Re: [netmod] rfc6991bis: inet:host Ladislav Lhotka
- Re: [netmod] rfc6991bis: inet:host Juergen Schoenwaelder
- Re: [netmod] rfc6991bis: inet:host Ladislav Lhotka
- Re: [netmod] rfc6991bis: inet:host tom petch
- Re: [netmod] rfc6991bis: inet:host Juergen Schoenwaelder
- Re: [netmod] rfc6991bis: inet:host Ladislav Lhotka
- Re: [netmod] rfc6991bis: inet:host Juergen Schoenwaelder
- Re: [netmod] rfc6991bis: inet:host Juergen Schoenwaelder
- Re: [netmod] rfc6991bis: inet:host Erik Auerswald
- Re: [netmod] rfc6991bis: inet:host Juergen Schoenwaelder
- Re: [netmod] rfc6991bis: inet:host Ladislav Lhotka
- Re: [netmod] rfc6991bis: inet:host Juergen Schoenwaelder
- Re: [netmod] rfc6991bis: inet:host Ladislav Lhotka
- Re: [netmod] rfc6991bis: inet:host Juergen Schoenwaelder
- Re: [netmod] rfc6991bis: inet:host Ladislav Lhotka
- Re: [netmod] rfc6991bis: inet:host Juergen Schoenwaelder
- Re: [netmod] rfc6991bis: inet:host Ladislav Lhotka
- Re: [netmod] rfc6991bis: inet:host Juergen Schoenwaelder
- Re: [netmod] rfc6991bis: inet:host Ladislav Lhotka