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Revision 1.1, Sun Jan 24 18:29:15 2021 UTC (3 years, 4 months ago) by florian
Branch: MAIN
CVS Tags: OPENBSD_7_5_BASE, OPENBSD_7_5, OPENBSD_7_4_BASE, OPENBSD_7_4, OPENBSD_7_3_BASE, OPENBSD_7_3, OPENBSD_7_2_BASE, OPENBSD_7_2, OPENBSD_7_1_BASE, OPENBSD_7_1, OPENBSD_7_0_BASE, OPENBSD_7_0, OPENBSD_6_9_BASE, OPENBSD_6_9, HEAD 

Implement DNS64 synthesis.
When unwind(8) learns new autoconf resolvers (from dhcp or router
advertisements) it checks if a DNS64 is present in this network
location and tries to recover the IPv6 prefix used according to
RFC7050.
The learned autoconf resolvers are then prevented from upgrading to
the validating state since DNS64 breaks DNSSEC.
unwind(8) can now perform its own synthesis. If a query for a AAAA
record results in no answer we re-send the query for A and if that
leads to an answer we synthesize an AAAA answer using the learned
prefixes.

Testing & OK kn

/*	$OpenBSD: dns64_synth.h,v 1.1 2021/01/24 18:29:15 florian Exp $	*/

/*
 * dns64/dns64.h - DNS64 module
 *
 * Copyright (c) 2009, Viagénie. All rights reserved.
 *
 * This software is open source.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the NLNET LABS nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef DNS64_SYNTH_H
#define DNS64_SYNTH_H

void
dns64_synth_aaaa_data(const struct ub_packed_rrset_key *, const struct
    packed_rrset_data *, struct ub_packed_rrset_key *, struct
    packed_rrset_data **, struct regional *);

#endif /* DNS64_SYNTH_H */