An Extension Language for the DNS
draft-levine-dnsextlang-08
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Network Working Group J. Levine
Internet-Draft Taughannock Networks
Intended status: Standards Track P. Vixie
Expires: March 8, 2017 September 4, 2016
An Extension Language for the DNS
draft-levine-dnsextlang-08
Abstract
Adding new RRTYPEs to the DNS has required that DNS servers and
provisioning software be upgraded to support each new RRTYPE in
Master files. This document defines a DNS extension language
intended to allow most new RRTYPEs to be supported by adding entries
to configuration data read by the DNS software, with no software
changes needed for each RRTYPE.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on March 8, 2017.
Copyright Notice
Copyright (c) 2016 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
Levine & Vixie Expires March 8, 2017 [Page 1]
Internet-Draft DNS Extension Language September 2016
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Typical usage . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Extension language syntax . . . . . . . . . . . . . . . . . . 3
3.1. Lexical structure . . . . . . . . . . . . . . . . . . . . 3
3.2. Storage in the DNS . . . . . . . . . . . . . . . . . . . 4
3.3. Storage in a file . . . . . . . . . . . . . . . . . . . . 5
3.4. Stanza structure . . . . . . . . . . . . . . . . . . . . 5
3.5. Field types . . . . . . . . . . . . . . . . . . . . . . . 6
4. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5. Security considerations . . . . . . . . . . . . . . . . . . . 9
6. IANA considerations . . . . . . . . . . . . . . . . . . . . . 9
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
7.1. References - Normative . . . . . . . . . . . . . . . . . 10
7.2. References - Informative . . . . . . . . . . . . . . . . 11
Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 11
A.1. Changes from -07 to -08 . . . . . . . . . . . . . . . . . 11
A.2. Changes from -06 to -07 . . . . . . . . . . . . . . . . . 11
A.3. Changes from -05 to -06 . . . . . . . . . . . . . . . . . 11
A.4. Changes from -04 to -05 . . . . . . . . . . . . . . . . . 11
A.5. Changes from -03 to -04 . . . . . . . . . . . . . . . . . 12
A.6. Changes from -02 to -03 . . . . . . . . . . . . . . . . . 12
A.7. Changes from -01 to -02 . . . . . . . . . . . . . . . . . 12
A.8. Changes from -00 to -01 . . . . . . . . . . . . . . . . . 12
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 12
1. Introduction
The Domain Name System[RFC1034] [RFC1035] is designed to be
extensible, with new record types, known as RRTYPEs, added as needed.
While it is straightforward in principle to add a new RRTYPE, in
practice it can be difficult due to the software changes needed to
add the new RRTYPE to the master file format read by many
authoritative DNS servers, and to the provisioning software used to
create and update the master files or the local equivalent.
While some new RRTYPEs, notably those for DNSSEC [RFC4033], require
that DNS servers do new special purpose processing, most new RRTYPEs
are, from the point of view of the DNS, just static data to return to
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