<!--
Copyright Internet Systems Consortium, Inc. ("ISC")

This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this
file, you can obtain one at https://mozilla.org/MPL/2.0/.

Copyright (C) Stichting NLnet, Netherlands, stichting@nlnet.nl.
Copyright (C) Vadim Goncharov, Russia, vadim_nuclight@mail.ru.

The development of Dynamically Loadable Zones (DLZ) for Bind 9 was
conceived and contributed by Rob Butler.

SPDX-License-Identifier: ISC and MPL-2.0

Permission to use, copy, modify, and distribute this software for any purpose
with or without fee is hereby granted, provided that the above copyright
notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND STICHTING NLNET DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL STICHTING NLNET BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-->

The "wildcard" DLZ module provides a "template" zone for domains matching
a wildcard name.  For example, the following DLZ configuration would match
any zone name containing the string "example" and ending with .com, such
as "thisexample.com", "exampleofthat.com", or "anexampleoftheotherthing.com".

    dlz "test" {
	database "dlopen ../dlz_wildcard_dynamic.so
        *example*.com 10.53.* 1800
        @      3600    SOA   {ns3.example.nil. support.example.nil. 42 14400 7200 2592000 600}
        @      3600    NS     ns3.example.nil.
        @      3600    NS     ns4.example.nil.
        @      3600    NS     ns8.example.nil.
        @      3600    MX     {5 mail.example.nil.}
        ftp    86400   A      192.0.0.1
        sql    86400   A      192.0.0.2
        tmp    {}      A      192.0.0.3
        www    86400   A      192.0.0.3
        www    86400   AAAA   ::1
        txt    300     TXT    {\"you requested $record$ in $zone$\"}
        *      86400   A      192.0.0.100";
    };

For any zone name matching the wildcard, it would return the data from
the template.  "$zone$" is replaced with zone name: i.e., the shortest
possible string of labels in the query name that matches the wildcard.
"$record$" is replaced with the remainder of the query name.  In the
example above, a query for "txt.thisexample.com/TXT" would return the
string "you requested txt in thisexample.com".

Any client whose source address matches the second wildcard ("10.53.*")
is allowed to request a zone transfer.