GDNSD.ZONEFILE(5)

NAME
gdnsd.zonefile - gdnsd zonefile syntax

SYNOPSIS
example.com:

  $TTL 86400

  @     SOA ns1 hostmaster (
        1      ; serial
        7200   ; refresh
        30M    ; retry
        3D     ; expire
        900    ; ncache
  )

  @     NS      ns1.example.com.
  @     NS      ns2
  @     NS      ns.example.net.

  ns1   A       192.0.2.1 ; a comment
  ns2.example.com.      A       192.0.2.2

  @     7200    MX      10 mail-a
  @     7200    MX      100 mail-b

  $ttl 86400
  ; a comment
  mail-a        A 192.0.2.3
  mail-b        A 192.0.2.4

  subz          NS      ns1.subz
  subz          NS      ns2.subz
  ns1.subz      A       192.0.2.5
  ns2.subz      A       192.0.2.6

  www   3600    DYNA    some_plugin!resource_name
  alias         CNAME   www

  _http._tcp    1800    SRV     5 500 80 www

  foo           TXT     "blah blah" "blah"
  _spf          SPF+    "v=spf1 ..."

DESCRIPTION
This is the zonefile syntax for gdnsd(8). The syntax is designed to be as close as possible to the standard zonefile syntax from RFC 1035 (which is the "standard" format one typically sees with traditional BIND servers).

This document will just cover a few important highlights and/or deviations.

DIRECTIVES
The standard $TTL and $ORIGIN directives are supported with their normal syntax.

$TTL changes the default TTL of any records coming after it, and can occur multiple times. Note that in the absence of a zonefile-level $TTL setting, the default TTL comes from the global config option "zones_default_ttl", which in turn defaults to 86400 (1 day).

$ORIGIN changes what is appended to unqualified hostnames (those lacking a final ".") seen in the zone file from that point forward, as well as any "@" entries (which is an alias for the current origin). $ORIGIN itself may also be an unqualified name, in which case the previous origin is appended to it. Any fully-qualified $ORIGIN must be within the zone described by this zonefile. The default origin is the zone name itself.

$ADDR_LIMIT_V4 is a non-standard, gdnsd-specific directive. It requires a single unsigned integer argument. The argument limits the total number of "A" records to include in the server's responses for any given "A" rrset (whether static or dynamic). The default limit is zero, which is interpreted as no limit. Setting the limit via this directive affects all rrsets until the value is changed again by another directive.

$ADDR_LIMIT_V6 same as above, but for IPv6 "AAAA" rrsets.

The RFC-standard $INCLUDE directive is not supported. It greatly complicates the detection of zone update transactions. Most legitimate uses of $INCLUDE to reduce redundancy should be replaced with a zonefile-generating script instead, perhaps using a template system.

BIND's $GENERATE extension is not supported at this time.

SUPPORTED RESOURCE RECORD TYPES
gdnsd(8) supports the following standard RR types with their standard RDATA formats: SOA, A, AAAA, NS, PTR, CNAME, MX, SRV, TXT, SPF, and NAPTR. All RRs must be in class "IN", which is the implicit default.

It also supports the generic format for unknown RR types documented in RFC 3597, which has syntax like:

  foo TYPE31337 \# 10 0123456789 ABCDEF0123

... which indicates an RR of numeric type 31337 containing 10 bytes of RDATA, specified as the final part of the RR as a pair of 5-byte hex strings. See RFC 3597 itself for full details. Note however that gdnsd does not allow using the RFC 3597 format for types gdnsd explicitly supports (all of which predate 3597 anyways), and that even in the RFC 3597 case we still only allow class "IN" RRs.

Additionally, gdnsd supports three special-case, non-standard virtual resource record types:

  DYNA
"DYNA" is for dynamically-determined address records (both A and AAAA) via plugin code. The right-hand-side of a "DYNA" RR is a plugin name and a resource name separated by an exclamation mark. The named plugin will be fed the resource name and the DNS client's IP address, and it is up to the plugin code which addresses of which types to return in the response.

The dynamic plugin response will be generated in answer to A or AAAA queries for the given name, and contain A and/or AAAA resource records as appropriate. "DYNA" cannot co-exist with actual static A or AAAA records at the same name.

  DYNC
"DYNC" is "DYNA"'s counterpart for dynamically-determined CNAME records via plugin code.

  SPF+
"SPF+" is simply shorthand for specifying a single set of text data which is duplicated as both TXT and SPF records at the same name. It is always equivalent to removing the "+", copying the whole record, and changing "SPF" to "TXT" in the second copy.

Our "TXT" (and SPF, and SPF+) RRs support the auto-splitting of long string constants. Rather than manually breaking the data into 255-byte chunks, you can specify a single long chunk and have the server break it at 255 byte boundaries automatically. (this behavior can be disabled via gdnsd.config(5) as well.)

SEE ALSO
gdnsd(8), gdnsd.config(5)

The gdnsd manual.

COPYRIGHT AND LICENSE
Copyright (c) 2012 Brandon L Black <blblack@gmail.com>

This file is part of gdnsd.

gdnsd is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

gdnsd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with gdnsd. If not, see <http://www.gnu.org/licenses/>.