lib/dns/ncache.c

	ncache.c revision 84185d19c7a9ef1ac23cc6236c8773697d4efeb1
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley/*
499b34cea04a46823d003d4c0520c8b03e8513cbBrian Wellington * Copyright (C) 1999-2001  Internet Software Consortium.
40f53fa8d9c6a4fc38c0014495e7a42b08f52481David Lawrence *
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley * Permission to use, copy, modify, and distribute this software for any
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley * purpose with or without fee is hereby granted, provided that the above
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley * copyright notice and this permission notice appear in all copies.
40f53fa8d9c6a4fc38c0014495e7a42b08f52481David Lawrence *
15a44745412679c30a6d022733925af70a38b715David Lawrence * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
15a44745412679c30a6d022733925af70a38b715David Lawrence * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
15a44745412679c30a6d022733925af70a38b715David Lawrence * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
15a44745412679c30a6d022733925af70a38b715David Lawrence * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
15a44745412679c30a6d022733925af70a38b715David Lawrence * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
15a44745412679c30a6d022733925af70a38b715David Lawrence * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
15a44745412679c30a6d022733925af70a38b715David Lawrence * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
15a44745412679c30a6d022733925af70a38b715David Lawrence * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley */
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley
84185d19c7a9ef1ac23cc6236c8773697d4efeb1Brian Wellington/* $Id: ncache.c,v 1.27 2002/01/22 09:07:22 bwelling Exp $ */
9c3531d72aeaad6c5f01efe6a1c82023e1379e4dDavid Lawrence
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley#include <config.h>
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley
f1788d67add6bf3d301e91b3f54fa3c90a87328eBrian Wellington#include <isc/buffer.h>
364a82f7c25b62967678027043425201a5e5171aBob Halley#include <isc/util.h>
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley#include <dns/db.h>
1a69a1a78cfaa86f3b68bbc965232b7876d4da2aDavid Lawrence#include <dns/message.h>
1a69a1a78cfaa86f3b68bbc965232b7876d4da2aDavid Lawrence#include <dns/ncache.h>
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley#include <dns/rdata.h>
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley#include <dns/rdatalist.h>
1a69a1a78cfaa86f3b68bbc965232b7876d4da2aDavid Lawrence#include <dns/rdataset.h>
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley/*
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley * The format of an ncache rdata is a sequence of one or more records of
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley * the following format:
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley *
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley *  owner name
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley *  type
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley *  rdata count
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley *      rdata length            These two occur 'rdata count'
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley *      rdata               times.
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley *
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley */
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halleystatic inline isc_result_t
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halleycopy_rdataset(dns_rdataset_t *rdataset, isc_buffer_t *buffer) {
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    isc_result_t result;
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    unsigned int count;
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    isc_region_t ar, r;
c03bb27f0675a6e60ceea66b451548e8481bc05cMark Andrews    dns_rdata_t rdata = DNS_RDATA_INIT;
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    /*
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley     * Copy the rdataset count to the buffer.
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley     */
6e49e91bd08778d7eae45a2229dcf41ed97cc636David Lawrence    isc_buffer_availableregion(buffer, &ar);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    if (ar.length < 2)
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley        return (ISC_R_NOSPACE);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    count = dns_rdataset_count(rdataset);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    INSIST(count <= 65535);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    isc_buffer_putuint16(buffer, (isc_uint16_t)count);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    result = dns_rdataset_first(rdataset);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    while (result == ISC_R_SUCCESS) {
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley        dns_rdataset_current(rdataset, &rdata);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley        dns_rdata_toregion(&rdata, &r);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley        INSIST(r.length <= 65535);
6e49e91bd08778d7eae45a2229dcf41ed97cc636David Lawrence        isc_buffer_availableregion(buffer, &ar);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley        if (ar.length < 2)
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley            return (ISC_R_NOSPACE);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley        /*
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley         * Copy the rdata length to the buffer.
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley         */
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley        isc_buffer_putuint16(buffer, (isc_uint16_t)r.length);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley        /*
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley         * Copy the rdata to the buffer.
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley         */
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley        result = isc_buffer_copyregion(buffer, &r);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley        if (result != ISC_R_SUCCESS)
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley            return (result);
368b37b616234fce3d23099eb180f1dd38e1fb62Mark Andrews        dns_rdata_reset(&rdata);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley        result = dns_rdataset_next(rdataset);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    }
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    if (result != ISC_R_NOMORE)
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley        return (result);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    return (ISC_R_SUCCESS);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley}
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halleyisc_result_t
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halleydns_ncache_add(dns_message_t *message, dns_db_t *cache, dns_dbnode_t *node,
7cd4c3ddd1baf5f2b204562fdba3da37c716cc78Andreas Gustafsson           dns_rdatatype_t covers, isc_stdtime_t now, dns_ttl_t maxttl,
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley           dns_rdataset_t *addedrdataset)
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley{
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    isc_result_t result;
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    isc_buffer_t buffer;
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    isc_region_t r;
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    dns_rdataset_t *rdataset;
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    dns_rdatatype_t type;
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    dns_name_t *name;
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    dns_ttl_t ttl;
66b2f0d4bfa342770aa5e26a005a0c0ec5071231Bob Halley    dns_trust_t trust;
c03bb27f0675a6e60ceea66b451548e8481bc05cMark Andrews    dns_rdata_t rdata = DNS_RDATA_INIT;
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley    dns_rdataset_t ncrdataset;
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley    dns_rdatalist_t ncrdatalist;
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley    unsigned char data[4096];
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley    /*
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley     * Convert the authority data from 'message' into a negative cache
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley     * rdataset, and store it in 'cache' at 'node'.
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley     */
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley    REQUIRE(message != NULL);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    /*
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley     * We assume that all data in the authority section has been
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley     * validated by the caller.
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley     */
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    /*
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley     * First, build an ncache rdata in buffer.
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley     */
7cd4c3ddd1baf5f2b204562fdba3da37c716cc78Andreas Gustafsson    ttl = maxttl;
66b2f0d4bfa342770aa5e26a005a0c0ec5071231Bob Halley    trust = 0xffff;
6e49e91bd08778d7eae45a2229dcf41ed97cc636David Lawrence    isc_buffer_init(&buffer, data, sizeof(data));
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    result = dns_message_firstname(message, DNS_SECTION_AUTHORITY);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    while (result == ISC_R_SUCCESS) {
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley        name = NULL;
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley        dns_message_currentname(message, DNS_SECTION_AUTHORITY,
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley                    &name);
66b2f0d4bfa342770aa5e26a005a0c0ec5071231Bob Halley        if ((name->attributes & DNS_NAMEATTR_NCACHE) != 0) {
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley            for (rdataset = ISC_LIST_HEAD(name->list);
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                 rdataset != NULL;
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                 rdataset = ISC_LIST_NEXT(rdataset, link)) {
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                if ((rdataset->attributes &
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                     DNS_RDATASETATTR_NCACHE) == 0)
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                    continue;
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                type = rdataset->type;
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                if (type == dns_rdatatype_sig)
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                    type = rdataset->covers;
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                if (type == dns_rdatatype_soa ||
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                    type == dns_rdatatype_nxt) {
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                    if (ttl > rdataset->ttl)
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                        ttl = rdataset->ttl;
66b2f0d4bfa342770aa5e26a005a0c0ec5071231Bob Halley                    if (trust > rdataset->trust)
66b2f0d4bfa342770aa5e26a005a0c0ec5071231Bob Halley                        trust = rdataset->trust;
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                    /*
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                     * Copy the owner name to the buffer.
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                     */
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                    dns_name_toregion(name, &r);
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                    result = isc_buffer_copyregion(&buffer,
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                                       &r);
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                    if (result != ISC_R_SUCCESS)
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                        return (result);
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                    /*
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                     * Copy the type to the buffer.
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                     */
1a69a1a78cfaa86f3b68bbc965232b7876d4da2aDavid Lawrence                    isc_buffer_availableregion(&buffer,
1a69a1a78cfaa86f3b68bbc965232b7876d4da2aDavid Lawrence                                   &r);
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                    if (r.length < 2)
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                        return (ISC_R_NOSPACE);
b5fff54fe9335b20c02d749831fc0eaeda97198fBrian Wellington                    isc_buffer_putuint16(&buffer,
b5fff54fe9335b20c02d749831fc0eaeda97198fBrian Wellington                                 rdataset->type);
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                    /*
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                     * Copy the rdataset into the buffer.
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                     */
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                    result = copy_rdataset(rdataset,
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                                   &buffer);
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                    if (result != ISC_R_SUCCESS)
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                        return (result);
e0df061f35a26d2bbd0986aa889f88b3710b32d4Bob Halley                }
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley            }
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley        }
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley        result = dns_message_nextname(message, DNS_SECTION_AUTHORITY);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    }
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    if (result != ISC_R_NOMORE)
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley        return (result);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley    if (trust == 0xffff) {
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley        /*
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley         * We didn't find any authority data from which to create a
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley         * negative cache rdataset.  In particular, we have no SOA.
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley         *
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley         * We trust that the caller wants negative caching, so this
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley         * means we have a "type 3 nxdomain" or "type 3 nodata"
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley         * response (see RFC 2308 for details).
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley         *
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley         * We will now build a suitable negative cache rdataset that
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley         * will cause zero bytes to be emitted when converted to
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley         * wire format.
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley         */
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley        /*
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley         * The ownername must exist, but it doesn't matter what value
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley         * it has.  We use the root name.
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley         */
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley        dns_name_toregion(dns_rootname, &r);
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley        result = isc_buffer_copyregion(&buffer, &r);
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley        if (result != ISC_R_SUCCESS)
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley            return (result);
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley        /*
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley         * Copy the type and a zero rdata count to the buffer.
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley         */
6e49e91bd08778d7eae45a2229dcf41ed97cc636David Lawrence        isc_buffer_availableregion(&buffer, &r);
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley        if (r.length < 4)
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley            return (ISC_R_NOSPACE);
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley        isc_buffer_putuint16(&buffer, 0);
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley        isc_buffer_putuint16(&buffer, 0);
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley        /*
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley         * RFC 2308, section 5, says that negative answers without
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley         * SOAs should not be cached.
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley         */
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley        ttl = 0;
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley        /*
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley         * Set trust.
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley         */
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley        if ((message->flags & DNS_MESSAGEFLAG_AA) != 0 &&
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley            message->counts[DNS_SECTION_ANSWER] == 0) {
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley            /*
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley             * The response has aa set and we haven't followed
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley             * any CNAME or DNAME chains.
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley             */
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley            trust = dns_trust_authauthority;
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley        } else
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley            trust = dns_trust_additional;
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley    }
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    /*
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley     * Now add it to the cache.
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley     */
66b2f0d4bfa342770aa5e26a005a0c0ec5071231Bob Halley    INSIST(trust != 0xffff);
6e49e91bd08778d7eae45a2229dcf41ed97cc636David Lawrence    isc_buffer_usedregion(&buffer, &r);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    rdata.data = r.base;
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    rdata.length = r.length;
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    rdata.rdclass = dns_db_class(cache);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    rdata.type = 0;
c03bb27f0675a6e60ceea66b451548e8481bc05cMark Andrews    rdata.flags = 0;
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    ncrdatalist.rdclass = rdata.rdclass;
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    ncrdatalist.type = 0;
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    ncrdatalist.covers = covers;
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    ncrdatalist.ttl = ttl;
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    ISC_LIST_INIT(ncrdatalist.rdata);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    ISC_LINK_INIT(&ncrdatalist, link);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    ISC_LIST_APPEND(ncrdatalist.rdata, &rdata, link);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    dns_rdataset_init(&ncrdataset);
1f1d36a87b65186d9f89aac7f456ab1fd2a39ef6Andreas Gustafsson    RUNTIME_CHECK(dns_rdatalist_tordataset(&ncrdatalist, &ncrdataset)
1f1d36a87b65186d9f89aac7f456ab1fd2a39ef6Andreas Gustafsson              == ISC_R_SUCCESS);
66b2f0d4bfa342770aa5e26a005a0c0ec5071231Bob Halley    ncrdataset.trust = trust;
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley
55254a46f91419b92eee0d20dfb958e8dd52526cBob Halley    return (dns_db_addrdataset(cache, node, NULL, now, &ncrdataset,
08af8bf5ade4131fe44926ad04fd489e64a620bbBob Halley                   0, addedrdataset));
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley}
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halleyisc_result_t
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halleydns_ncache_towire(dns_rdataset_t *rdataset, dns_compress_t *cctx,
84185d19c7a9ef1ac23cc6236c8773697d4efeb1Brian Wellington          isc_buffer_t *target, isc_boolean_t omit_dnssec,
84185d19c7a9ef1ac23cc6236c8773697d4efeb1Brian Wellington          unsigned int *countp)
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley{
c03bb27f0675a6e60ceea66b451548e8481bc05cMark Andrews    dns_rdata_t rdata = DNS_RDATA_INIT;
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley    isc_result_t result;
8569ab045a4cf6ecd1b5a3354ddb1c93ef34ea57Brian Wellington    isc_region_t remaining, tavailable;
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley    isc_buffer_t source, savedbuffer, rdlen;
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley    dns_name_t name;
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley    dns_rdatatype_t type;
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley    unsigned int i, rcount, count;
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley    /*
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley     * Convert the negative caching rdataset 'rdataset' to wire format,
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley     * compressing names as specified in 'cctx', and storing the result in
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley     * 'target'.
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley     */
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley
569d094440399b000e059d4cb3434391c2c4d330Michael Graff    REQUIRE(rdataset != NULL);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley    REQUIRE(rdataset->type == 0);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley    result = dns_rdataset_first(rdataset);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley    if (result != ISC_R_SUCCESS)
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley        return (result);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley    dns_rdataset_current(rdataset, &rdata);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley    INSIST(dns_rdataset_next(rdataset) == ISC_R_NOMORE);
6e49e91bd08778d7eae45a2229dcf41ed97cc636David Lawrence    isc_buffer_init(&source, rdata.data, rdata.length);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley    isc_buffer_add(&source, rdata.length);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley    savedbuffer = *target;
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley    count = 0;
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley    do {
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley        dns_name_init(&name, NULL);
6e49e91bd08778d7eae45a2229dcf41ed97cc636David Lawrence        isc_buffer_remainingregion(&source, &remaining);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley        dns_name_fromregion(&name, &remaining);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley        INSIST(remaining.length >= name.length);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley        isc_buffer_forward(&source, name.length);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley        remaining.length -= name.length;
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley        INSIST(remaining.length >= 4);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley        type = isc_buffer_getuint16(&source);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley        rcount = isc_buffer_getuint16(&source);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley        for (i = 0; i < rcount; i++) {
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            /*
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley             * Get the length of this rdata and set up an
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley             * rdata structure for it.
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley             */
6e49e91bd08778d7eae45a2229dcf41ed97cc636David Lawrence            isc_buffer_remainingregion(&source, &remaining);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            INSIST(remaining.length >= 2);
368b37b616234fce3d23099eb180f1dd38e1fb62Mark Andrews            dns_rdata_reset(&rdata);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            rdata.length = isc_buffer_getuint16(&source);
6e49e91bd08778d7eae45a2229dcf41ed97cc636David Lawrence            isc_buffer_remainingregion(&source, &remaining);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            rdata.data = remaining.base;
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            rdata.type = type;
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            rdata.rdclass = rdataset->rdclass;
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            INSIST(remaining.length >= rdata.length);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            isc_buffer_forward(&source, rdata.length);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley
84185d19c7a9ef1ac23cc6236c8773697d4efeb1Brian Wellington            if (omit_dnssec && dns_rdatatype_isdnssec(type))
84185d19c7a9ef1ac23cc6236c8773697d4efeb1Brian Wellington                continue;
84185d19c7a9ef1ac23cc6236c8773697d4efeb1Brian Wellington
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            /*
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley             * Write the name.
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley             */
94a08e09db3dc844b6ee4841c368a2d7074a9c3fAndreas Gustafsson            dns_compress_setmethods(cctx, DNS_COMPRESS_GLOBAL14);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            result = dns_name_towire(&name, cctx, target);
419590499823ce15b5d2ad4fe71eaf04bd5a86c0Michael Graff            if (result != ISC_R_SUCCESS)
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley                goto rollback;
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            /*
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley             * See if we have space for type, class, ttl, and
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley             * rdata length.  Write the type, class, and ttl.
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley             */
8569ab045a4cf6ecd1b5a3354ddb1c93ef34ea57Brian Wellington            isc_buffer_availableregion(target, &tavailable);
8569ab045a4cf6ecd1b5a3354ddb1c93ef34ea57Brian Wellington            if (tavailable.length < 10) {
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley                result = ISC_R_NOSPACE;
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley                goto rollback;
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            }
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            isc_buffer_putuint16(target, type);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            isc_buffer_putuint16(target, rdataset->rdclass);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            isc_buffer_putuint32(target, rdataset->ttl);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            /*
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley             * Save space for rdata length.
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley             */
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            rdlen = *target;
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            isc_buffer_add(target, 2);
40f53fa8d9c6a4fc38c0014495e7a42b08f52481David Lawrence
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            /*
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley             * Write the rdata.
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley             */
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            result = dns_rdata_towire(&rdata, cctx, target);
419590499823ce15b5d2ad4fe71eaf04bd5a86c0Michael Graff            if (result != ISC_R_SUCCESS)
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley                goto rollback;
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            /*
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley             * Set the rdata length field to the compressed
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley             * length.
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley             */
c866769e664ba0a6a5e6f9375245f5ccca393009David Lawrence            INSIST((target->used >= rdlen.used + 2) &&
c866769e664ba0a6a5e6f9375245f5ccca393009David Lawrence                   (target->used - rdlen.used - 2 < 65536));
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            isc_buffer_putuint16(&rdlen,
c866769e664ba0a6a5e6f9375245f5ccca393009David Lawrence                         (isc_uint16_t)(target->used -
c866769e664ba0a6a5e6f9375245f5ccca393009David Lawrence                                rdlen.used - 2));
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley            count++;
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley        }
6e49e91bd08778d7eae45a2229dcf41ed97cc636David Lawrence        isc_buffer_remainingregion(&source, &remaining);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley    } while (remaining.length > 0);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley    *countp = count;
40f53fa8d9c6a4fc38c0014495e7a42b08f52481David Lawrence
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley    return (ISC_R_SUCCESS);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley rollback:
c866769e664ba0a6a5e6f9375245f5ccca393009David Lawrence    INSIST(savedbuffer.used < 65536);
c866769e664ba0a6a5e6f9375245f5ccca393009David Lawrence    dns_compress_rollback(cctx, (isc_uint16_t)savedbuffer.used);
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley    *countp = 0;
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley    *target = savedbuffer;
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley
948eabe2a254a8a278ef6325f3790e75329ee656Bob Halley    return (result);
4e142a5bccd2944174ad9ae58d86cf03e170054dBob Halley}