nsec3.c 47.1 KB
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/*
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 * Copyright (C) 2006, 2008-2012  Internet Systems Consortium, Inc. ("ISC")
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 *
 * Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC 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.
 */

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/* $Id$ */
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#include <config.h>

#include <isc/base32.h>
#include <isc/buffer.h>
#include <isc/hex.h>
#include <isc/iterated_hash.h>
#include <isc/string.h>
#include <isc/util.h>

#include <dst/dst.h>

#include <dns/db.h>
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#include <dns/zone.h>
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#include <dns/compress.h>
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#include <dns/dbiterator.h>
#include <dns/diff.h>
#include <dns/fixedname.h>
#include <dns/nsec3.h>
#include <dns/rdata.h>
#include <dns/rdatalist.h>
#include <dns/rdataset.h>
#include <dns/rdatasetiter.h>
#include <dns/rdatastruct.h>
#include <dns/result.h>

#define CHECK(x) do { \
	result = (x); \
	if (result != ISC_R_SUCCESS) \
		goto failure; \
	} while (0)

#define OPTOUT(x) (((x) & DNS_NSEC3FLAG_OPTOUT) != 0)
#define CREATE(x) (((x) & DNS_NSEC3FLAG_CREATE) != 0)
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#define INITIAL(x) (((x) & DNS_NSEC3FLAG_INITIAL) != 0)
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#define REMOVE(x) (((x) & DNS_NSEC3FLAG_REMOVE) != 0)

static void
set_bit(unsigned char *array, unsigned int index, unsigned int bit) {
	unsigned int shift, mask;

	shift = 7 - (index % 8);
	mask = 1 << shift;

	if (bit != 0)
		array[index / 8] |= mask;
	else
		array[index / 8] &= (~mask & 0xFF);
}

static unsigned int
bit_isset(unsigned char *array, unsigned int index) {
	unsigned int byte, shift, mask;

	byte = array[index / 8];
	shift = 7 - (index % 8);
	mask = 1 << shift;

	return ((byte & mask) != 0);
}

isc_result_t
dns_nsec3_buildrdata(dns_db_t *db, dns_dbversion_t *version,
		     dns_dbnode_t *node, unsigned int hashalg,
		     unsigned int flags, unsigned int iterations,
		     const unsigned char *salt, size_t salt_length,
		     const unsigned char *nexthash, size_t hash_length,
		     unsigned char *buffer, dns_rdata_t *rdata)
{
	isc_result_t result;
	dns_rdataset_t rdataset;
	isc_region_t r;
	unsigned int i, window;
	int octet;
	isc_boolean_t found;
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	isc_boolean_t found_ns;
	isc_boolean_t need_rrsig;
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	unsigned char *nsec_bits, *bm;
	unsigned int max_type;
	dns_rdatasetiter_t *rdsiter;
	unsigned char *p;

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	REQUIRE(salt_length < 256U);
	REQUIRE(hash_length < 256U);
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	REQUIRE(flags <= 0xffU);
	REQUIRE(hashalg <= 0xffU);
	REQUIRE(iterations <= 0xffffU);

	switch (hashalg) {
	case dns_hash_sha1:
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		REQUIRE(hash_length == ISC_SHA1_DIGESTLENGTH);
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		break;
	}

	memset(buffer, 0, DNS_NSEC3_BUFFERSIZE);

	p = buffer;

	*p++ = hashalg;
	*p++ = flags;

	*p++ = iterations >> 8;
	*p++ = iterations;

	*p++ = salt_length;
	memcpy(p, salt, salt_length);
	p += salt_length;

	*p++ = hash_length;
	memcpy(p, nexthash, hash_length);
	p += hash_length;

	r.length = p - buffer;
	r.base = buffer;

	/*
	 * Use the end of the space for a raw bitmap leaving enough
	 * space for the window identifiers and length octets.
	 */
	bm = r.base + r.length + 512;
	nsec_bits = r.base + r.length;
	max_type = 0;
	if (node == NULL)
		goto collapse_bitmap;
	dns_rdataset_init(&rdataset);
	rdsiter = NULL;
	result = dns_db_allrdatasets(db, node, version, 0, &rdsiter);
	if (result != ISC_R_SUCCESS)
		return (result);
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	found = found_ns = need_rrsig = ISC_FALSE;
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	for (result = dns_rdatasetiter_first(rdsiter);
	     result == ISC_R_SUCCESS;
	     result = dns_rdatasetiter_next(rdsiter))
	{
		dns_rdatasetiter_current(rdsiter, &rdataset);
		if (rdataset.type != dns_rdatatype_nsec &&
		    rdataset.type != dns_rdatatype_nsec3 &&
		    rdataset.type != dns_rdatatype_rrsig) {
			if (rdataset.type > max_type)
				max_type = rdataset.type;
			set_bit(bm, rdataset.type, 1);
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			/*
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			 * Work out if we need to set the RRSIG bit for
			 * this node.  We set the RRSIG bit if either of
			 * the following conditions are met:
			 * 1) We have a SOA or DS then we need to set
			 *    the RRSIG bit as both always will be signed.
			 * 2) We set the RRSIG bit if we don't have
			 *    a NS record but do have other data.
			 */
			if (rdataset.type == dns_rdatatype_soa ||
			    rdataset.type == dns_rdatatype_ds)
				need_rrsig = ISC_TRUE;
			else if (rdataset.type == dns_rdatatype_ns)
				found_ns = ISC_TRUE;
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			else
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				found = ISC_TRUE;
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		}
		dns_rdataset_disassociate(&rdataset);
	}
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	if ((found && !found_ns) || need_rrsig) {
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		if (dns_rdatatype_rrsig > max_type)
			max_type = dns_rdatatype_rrsig;
		set_bit(bm, dns_rdatatype_rrsig, 1);
	}

	/*
	 * At zone cuts, deny the existence of glue in the parent zone.
	 */
	if (bit_isset(bm, dns_rdatatype_ns) &&
	    ! bit_isset(bm, dns_rdatatype_soa)) {
		for (i = 0; i <= max_type; i++) {
			if (bit_isset(bm, i) &&
			    ! dns_rdatatype_iszonecutauth((dns_rdatatype_t)i))
				set_bit(bm, i, 0);
		}
	}

	dns_rdatasetiter_destroy(&rdsiter);
	if (result != ISC_R_NOMORE)
		return (result);

 collapse_bitmap:
	for (window = 0; window < 256; window++) {
		if (window * 256 > max_type)
			break;
		for (octet = 31; octet >= 0; octet--)
			if (bm[window * 32 + octet] != 0)
				break;
		if (octet < 0)
			continue;
		nsec_bits[0] = window;
		nsec_bits[1] = octet + 1;
		/*
		 * Note: potentially overlapping move.
		 */
		memmove(&nsec_bits[2], &bm[window * 32], octet + 1);
		nsec_bits += 3 + octet;
	}
	r.length = nsec_bits - r.base;
	INSIST(r.length <= DNS_NSEC3_BUFFERSIZE);
	dns_rdata_fromregion(rdata, dns_db_class(db), dns_rdatatype_nsec3, &r);

	return (ISC_R_SUCCESS);
}

isc_boolean_t
dns_nsec3_typepresent(dns_rdata_t *rdata, dns_rdatatype_t type) {
	dns_rdata_nsec3_t nsec3;
	isc_result_t result;
	isc_boolean_t present;
	unsigned int i, len, window;

	REQUIRE(rdata != NULL);
	REQUIRE(rdata->type == dns_rdatatype_nsec3);

	/* This should never fail */
	result = dns_rdata_tostruct(rdata, &nsec3, NULL);
	INSIST(result == ISC_R_SUCCESS);
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	present = ISC_FALSE;
	for (i = 0; i < nsec3.len; i += len) {
		INSIST(i + 2 <= nsec3.len);
		window = nsec3.typebits[i];
		len = nsec3.typebits[i + 1];
		INSIST(len > 0 && len <= 32);
		i += 2;
		INSIST(i + len <= nsec3.len);
		if (window * 256 > type)
			break;
		if ((window + 1) * 256 <= type)
			continue;
		if (type < (window * 256) + len * 8)
			present = ISC_TF(bit_isset(&nsec3.typebits[i],
						   type % 256));
		break;
	}
	dns_rdata_freestruct(&nsec3);
	return (present);
}

isc_result_t
dns_nsec3_hashname(dns_fixedname_t *result,
		   unsigned char rethash[NSEC3_MAX_HASH_LENGTH],
		   size_t *hash_length, dns_name_t *name, dns_name_t *origin,
		   dns_hash_t hashalg, unsigned int iterations,
		   const unsigned char *salt, size_t saltlength)
{
	unsigned char hash[NSEC3_MAX_HASH_LENGTH];
	unsigned char nametext[DNS_NAME_FORMATSIZE];
	dns_fixedname_t fixed;
	dns_name_t *downcased;
	isc_buffer_t namebuffer;
	isc_region_t region;
	size_t len;

	if (rethash == NULL)
		rethash = hash;

	memset(rethash, 0, NSEC3_MAX_HASH_LENGTH);

	dns_fixedname_init(&fixed);
	downcased = dns_fixedname_name(&fixed);
	dns_name_downcase(name, downcased, NULL);

	/* hash the node name */
	len = isc_iterated_hash(rethash, hashalg, iterations, salt, saltlength,
				downcased->ndata, downcased->length);
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	if (len == 0U)
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		return (DNS_R_BADALG);

	if (hash_length != NULL)
		*hash_length = len;

	/* convert the hash to base32hex */
	region.base = rethash;
	region.length = len;
	isc_buffer_init(&namebuffer, nametext, sizeof nametext);
	isc_base32hex_totext(&region, 1, "", &namebuffer);

	/* convert the hex to a domain name */
	dns_fixedname_init(result);
	return (dns_name_fromtext(dns_fixedname_name(result), &namebuffer,
				  origin, 0, NULL));
}

unsigned int
dns_nsec3_hashlength(dns_hash_t hash) {

	switch (hash) {
	case dns_hash_sha1: return(ISC_SHA1_DIGESTLENGTH);
	}
	return (0);
}

isc_boolean_t
dns_nsec3_supportedhash(dns_hash_t hash) {
	switch (hash) {
	case dns_hash_sha1: return (ISC_TRUE);
	}
	return (ISC_FALSE);
}

/*%
 * Update a single RR in version 'ver' of 'db' and log the
 * update in 'diff'.
 *
 * Ensures:
 * \li  '*tuple' == NULL.  Either the tuple is freed, or its
 *      ownership has been transferred to the diff.
 */
static isc_result_t
do_one_tuple(dns_difftuple_t **tuple, dns_db_t *db, dns_dbversion_t *ver,
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	     dns_diff_t *diff)
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{
	dns_diff_t temp_diff;
	isc_result_t result;

	/*
	 * Create a singleton diff.
	 */
	dns_diff_init(diff->mctx, &temp_diff);
	temp_diff.resign = diff->resign;
	ISC_LIST_APPEND(temp_diff.tuples, *tuple, link);

	/*
	 * Apply it to the database.
	 */
	result = dns_diff_apply(&temp_diff, db, ver);
	ISC_LIST_UNLINK(temp_diff.tuples, *tuple, link);
	if (result != ISC_R_SUCCESS) {
		dns_difftuple_free(tuple);
		return (result);
	}

	/*
	 * Merge it into the current pending journal entry.
	 */
	dns_diff_appendminimal(diff, tuple);

	/*
	 * Do not clear temp_diff.
	 */
	return (ISC_R_SUCCESS);
}

/*%
 * Set '*exists' to true iff the given name exists, to false otherwise.
 */
static isc_result_t
name_exists(dns_db_t *db, dns_dbversion_t *version, dns_name_t *name,
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	    isc_boolean_t *exists)
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{
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	isc_result_t result;
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	dns_dbnode_t *node = NULL;
	dns_rdatasetiter_t *iter = NULL;

	result = dns_db_findnode(db, name, ISC_FALSE, &node);
	if (result == ISC_R_NOTFOUND) {
		*exists = ISC_FALSE;
		return (ISC_R_SUCCESS);
	}
	if (result != ISC_R_SUCCESS)
		return (result);

	result = dns_db_allrdatasets(db, node, version,
				     (isc_stdtime_t) 0, &iter);
	if (result != ISC_R_SUCCESS)
		goto cleanup_node;

	result = dns_rdatasetiter_first(iter);
	if (result == ISC_R_SUCCESS) {
		*exists = ISC_TRUE;
	} else if (result == ISC_R_NOMORE) {
		*exists = ISC_FALSE;
		result = ISC_R_SUCCESS;
	} else
		*exists = ISC_FALSE;
	dns_rdatasetiter_destroy(&iter);

 cleanup_node:
	dns_db_detachnode(db, &node);
	return (result);
}

static isc_boolean_t
match_nsec3param(const dns_rdata_nsec3_t *nsec3,
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		 const dns_rdata_nsec3param_t *nsec3param)
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{
	if (nsec3->hash == nsec3param->hash &&
	    nsec3->iterations == nsec3param->iterations &&
	    nsec3->salt_length == nsec3param->salt_length &&
	    !memcmp(nsec3->salt, nsec3param->salt, nsec3->salt_length))
		return (ISC_TRUE);
	return (ISC_FALSE);
}

/*%
 * Delete NSEC3 records at "name" which match "param", recording the
 * change in "diff".
 */
static isc_result_t
delete(dns_db_t *db, dns_dbversion_t *version, dns_name_t *name,
       const dns_rdata_nsec3param_t *nsec3param, dns_diff_t *diff)
{
	dns_dbnode_t *node = NULL ;
	dns_difftuple_t *tuple = NULL;
	dns_rdata_nsec3_t nsec3;
	dns_rdataset_t rdataset;
	isc_result_t result;

	result = dns_db_findnsec3node(db, name, ISC_FALSE, &node);
	if (result == ISC_R_NOTFOUND)
		return (ISC_R_SUCCESS);
	if (result != ISC_R_SUCCESS)
		return (result);

	dns_rdataset_init(&rdataset);
	result = dns_db_findrdataset(db, node, version, dns_rdatatype_nsec3, 0,
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				     (isc_stdtime_t) 0, &rdataset, NULL);
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	if (result == ISC_R_NOTFOUND) {
		result = ISC_R_SUCCESS;
		goto cleanup_node;
	}
	if (result != ISC_R_SUCCESS)
		goto cleanup_node;

	for (result = dns_rdataset_first(&rdataset);
	     result == ISC_R_SUCCESS;
	     result = dns_rdataset_next(&rdataset))
	{
		dns_rdata_t rdata = DNS_RDATA_INIT;
		dns_rdataset_current(&rdataset, &rdata);
		CHECK(dns_rdata_tostruct(&rdata, &nsec3, NULL));

		if (!match_nsec3param(&nsec3, nsec3param))
			continue;
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		result = dns_difftuple_create(diff->mctx, DNS_DIFFOP_DEL, name,
					      rdataset.ttl, &rdata, &tuple);
		if (result != ISC_R_SUCCESS)
			goto failure;
		result = do_one_tuple(&tuple, db, version, diff);
		if (result != ISC_R_SUCCESS)
			goto failure;
	}
	if (result != ISC_R_NOMORE)
		goto failure;
	result = ISC_R_SUCCESS;

 failure:
	dns_rdataset_disassociate(&rdataset);
 cleanup_node:
	dns_db_detachnode(db, &node);

	return (result);
}

static isc_boolean_t
better_param(dns_rdataset_t *nsec3paramset, dns_rdata_t *param) {
	dns_rdataset_t rdataset;
	isc_result_t result;

	if (REMOVE(param->data[1]))
		return (ISC_TRUE);

	dns_rdataset_init(&rdataset);
	dns_rdataset_clone(nsec3paramset, &rdataset);
	for (result = dns_rdataset_first(&rdataset);
	     result == ISC_R_SUCCESS;
	     result = dns_rdataset_next(&rdataset)) {
		dns_rdata_t rdata =  DNS_RDATA_INIT;
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		unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE];

		if (rdataset.type != dns_rdatatype_nsec3param) {
			dns_rdata_t tmprdata =  DNS_RDATA_INIT;
			dns_rdataset_current(&rdataset, &tmprdata);
			if (!dns_nsec3param_fromprivate(&tmprdata, &rdata,
							buf, sizeof(buf)))
				continue;
		} else
			dns_rdataset_current(&rdataset, &rdata);
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		if (rdata.length != param->length)
			continue;
		if (rdata.data[0] != param->data[0] ||
		    REMOVE(rdata.data[1]) ||
		    rdata.data[2] != param->data[2] ||
		    rdata.data[3] != param->data[3] ||
		    rdata.data[4] != param->data[4] ||
		    memcmp(&rdata.data[5], &param->data[5], param->data[4]))
			continue;
		if (CREATE(rdata.data[1]) && !CREATE(param->data[1])) {
			dns_rdataset_disassociate(&rdataset);
			return (ISC_TRUE);
		}
	}
	dns_rdataset_disassociate(&rdataset);
	return (ISC_FALSE);
}

static isc_result_t
find_nsec3(dns_rdata_nsec3_t *nsec3, dns_rdataset_t *rdataset,
	   const dns_rdata_nsec3param_t *nsec3param)
{
	isc_result_t result;
	for (result = dns_rdataset_first(rdataset);
	     result == ISC_R_SUCCESS;
	     result = dns_rdataset_next(rdataset)) {
		dns_rdata_t rdata = DNS_RDATA_INIT;

		dns_rdataset_current(rdataset, &rdata);
		CHECK(dns_rdata_tostruct(&rdata, nsec3, NULL));
		dns_rdata_reset(&rdata);
		if (match_nsec3param(nsec3, nsec3param))
			break;
	}
 failure:
	return (result);
}

isc_result_t
dns_nsec3_addnsec3(dns_db_t *db, dns_dbversion_t *version,
		   dns_name_t *name, const dns_rdata_nsec3param_t *nsec3param,
		   dns_ttl_t nsecttl, isc_boolean_t unsecure, dns_diff_t *diff)
{
	dns_dbiterator_t *dbit = NULL;
	dns_dbnode_t *node = NULL;
	dns_dbnode_t *newnode = NULL;
	dns_difftuple_t *tuple = NULL;
	dns_fixedname_t fixed;
	dns_fixedname_t fprev;
	dns_hash_t hash;
	dns_name_t *hashname;
	dns_name_t *origin;
	dns_name_t *prev;
	dns_name_t empty;
	dns_rdata_nsec3_t nsec3;
	dns_rdata_t rdata = DNS_RDATA_INIT;
	dns_rdataset_t rdataset;
	int pass;
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	isc_boolean_t exists = ISC_FALSE;
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	isc_boolean_t maybe_remove_unsecure = ISC_FALSE;
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	isc_uint8_t flags;
	isc_buffer_t buffer;
	isc_result_t result;
	unsigned char *old_next;
	unsigned char *salt;
	unsigned char nexthash[NSEC3_MAX_HASH_LENGTH];
	unsigned char nsec3buf[DNS_NSEC3_BUFFERSIZE];
	unsigned int iterations;
	unsigned int labels;
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	size_t next_length;
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	unsigned int old_length;
	unsigned int salt_length;

	dns_fixedname_init(&fixed);
	hashname = dns_fixedname_name(&fixed);
	dns_fixedname_init(&fprev);
	prev = dns_fixedname_name(&fprev);

	dns_rdataset_init(&rdataset);

	origin = dns_db_origin(db);

	/*
	 * Chain parameters.
	 */
	hash = nsec3param->hash;
	iterations = nsec3param->iterations;
	salt_length = nsec3param->salt_length;
	salt = nsec3param->salt;

	/*
	 * Default flags for a new chain.
	 */
	flags = nsec3param->flags & DNS_NSEC3FLAG_OPTOUT;

	/*
	 * If this is the first NSEC3 in the chain nexthash will
	 * remain pointing to itself.
	 */
	next_length = sizeof(nexthash);
	CHECK(dns_nsec3_hashname(&fixed, nexthash, &next_length,
				 name, origin, hash, iterations,
				 salt, salt_length));

	/*
	 * Create the node if it doesn't exist and hold
	 * a reference to it until we have added the NSEC3.
	 */
	CHECK(dns_db_findnsec3node(db, hashname, ISC_TRUE, &newnode));

	/*
	 * Seek the iterator to the 'newnode'.
	 */
	CHECK(dns_db_createiterator(db, DNS_DB_NSEC3ONLY, &dbit));
	CHECK(dns_dbiterator_seek(dbit, hashname));
	CHECK(dns_dbiterator_pause(dbit));
	result = dns_db_findrdataset(db, newnode, version, dns_rdatatype_nsec3,
				     0, (isc_stdtime_t) 0, &rdataset, NULL);
	/*
	 * If we updating a existing NSEC3 then find its
	 * next field.
	 */
	if (result == ISC_R_SUCCESS) {
		result = find_nsec3(&nsec3, &rdataset, nsec3param);
		if (result == ISC_R_SUCCESS) {
			if (!CREATE(nsec3param->flags))
				flags = nsec3.flags;
			next_length = nsec3.next_length;
			INSIST(next_length <= sizeof(nexthash));
			memcpy(nexthash, nsec3.next, next_length);
			dns_rdataset_disassociate(&rdataset);
			/*
			 * If the NSEC3 is not for a unsecure delegation then
			 * we are just updating it.  If it is for a unsecure
			 * delegation then we need find out if we need to
			 * remove the NSEC3 record or not by examining the
			 * previous NSEC3 record.
			 */
			if (!unsecure)
				goto addnsec3;
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			else if (CREATE(nsec3param->flags) && OPTOUT(flags)) {
				result = dns_nsec3_delnsec3(db, version, name,
							    nsec3param, diff);
				goto failure;
			} else
				maybe_remove_unsecure = ISC_TRUE;
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		} else {
			dns_rdataset_disassociate(&rdataset);
			if (result != ISC_R_NOMORE)
				goto failure;
		}
	}

	/*
	 * Find the previous NSEC3 (if any) and update it if required.
	 */
	pass = 0;
	do {
		result = dns_dbiterator_prev(dbit);
		if (result == ISC_R_NOMORE) {
			pass++;
			CHECK(dns_dbiterator_last(dbit));
		}
		CHECK(dns_dbiterator_current(dbit, &node, prev));
		CHECK(dns_dbiterator_pause(dbit));
		result = dns_db_findrdataset(db, node, version,
					     dns_rdatatype_nsec3, 0,
					     (isc_stdtime_t) 0, &rdataset,
					     NULL);
		dns_db_detachnode(db, &node);
		if (result != ISC_R_SUCCESS)
			continue;

		result = find_nsec3(&nsec3, &rdataset, nsec3param);
		if (result == ISC_R_NOMORE) {
			dns_rdataset_disassociate(&rdataset);
			continue;
		}
		if (result != ISC_R_SUCCESS)
			goto failure;

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		if (maybe_remove_unsecure) {
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			dns_rdataset_disassociate(&rdataset);
			/*
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			 * If we have OPTOUT set in the previous NSEC3 record
			 * we actually need to delete the NSEC3 record.
			 * Otherwise we just need to replace the NSEC3 record.
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			 */
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			if (OPTOUT(nsec3.flags)) {
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				result = dns_nsec3_delnsec3(db, version, name,
							    nsec3param, diff);
				goto failure;
			}
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			goto addnsec3;
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		} else {
			/*
			 * Is this is a unsecure delegation we are adding?
			 * If so no change is required.
			 */
			if (OPTOUT(nsec3.flags) && unsecure) {
				dns_rdataset_disassociate(&rdataset);
				goto failure;
			}
		}

		old_next = nsec3.next;
		old_length = nsec3.next_length;

		/*
		 * Delete the old previous NSEC3.
		 */
		CHECK(delete(db, version, prev, nsec3param, diff));

		/*
		 * Fixup the previous NSEC3.
		 */
		nsec3.next = nexthash;
		nsec3.next_length = next_length;
		isc_buffer_init(&buffer, nsec3buf, sizeof(nsec3buf));
		CHECK(dns_rdata_fromstruct(&rdata, rdataset.rdclass,
					   dns_rdatatype_nsec3, &nsec3,
					   &buffer));
		CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, prev,
					   rdataset.ttl, &rdata, &tuple));
		CHECK(do_one_tuple(&tuple, db, version, diff));
		INSIST(old_length <= sizeof(nexthash));
		memcpy(nexthash, old_next, old_length);
		if (!CREATE(nsec3param->flags))
			flags = nsec3.flags;
		dns_rdata_reset(&rdata);
		dns_rdataset_disassociate(&rdataset);
		break;
	} while (pass < 2);

 addnsec3:
	/*
	 * Create the NSEC3 RDATA.
	 */
	CHECK(dns_db_findnode(db, name, ISC_FALSE, &node));
	CHECK(dns_nsec3_buildrdata(db, version, node, hash, flags, iterations,
				   salt, salt_length, nexthash, next_length,
				   nsec3buf, &rdata));
	dns_db_detachnode(db, &node);
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	/*
	 * Delete the old NSEC3 and record the change.
	 */
	CHECK(delete(db, version, hashname, nsec3param, diff));
	/*
	 * Add the new NSEC3 and record the change.
	 */
	CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD,
				   hashname, nsecttl, &rdata, &tuple));
	CHECK(do_one_tuple(&tuple, db, version, diff));
	INSIST(tuple == NULL);
	dns_rdata_reset(&rdata);
	dns_db_detachnode(db, &newnode);

	/*
	 * Add missing NSEC3 records for empty nodes
	 */
	dns_name_init(&empty, NULL);
	dns_name_clone(name, &empty);
	do {
		labels = dns_name_countlabels(&empty) - 1;
		if (labels <= dns_name_countlabels(origin))
			break;
		dns_name_getlabelsequence(&empty, 1, labels, &empty);
		CHECK(name_exists(db, version, &empty, &exists));
		if (exists)
			break;
		CHECK(dns_nsec3_hashname(&fixed, nexthash, &next_length,
					 &empty, origin, hash, iterations,
					 salt, salt_length));

		/*
		 * Create the node if it doesn't exist and hold
		 * a reference to it until we have added the NSEC3
		 * or we discover we don't need to add make a change.
		 */
		CHECK(dns_db_findnsec3node(db, hashname, ISC_TRUE, &newnode));
		result = dns_db_findrdataset(db, newnode, version,
					     dns_rdatatype_nsec3, 0,
					     (isc_stdtime_t) 0, &rdataset,
					     NULL);
		if (result == ISC_R_SUCCESS) {
			result = find_nsec3(&nsec3, &rdataset, nsec3param);
			dns_rdataset_disassociate(&rdataset);
			if (result == ISC_R_SUCCESS) {
				dns_db_detachnode(db, &newnode);
				break;
			}
			if (result != ISC_R_NOMORE)
				goto failure;
		}

		/*
		 * Find the previous NSEC3 and update it.
		 */
		CHECK(dns_dbiterator_seek(dbit, hashname));
		pass = 0;
		do {
			result = dns_dbiterator_prev(dbit);
			if (result == ISC_R_NOMORE) {
				pass++;
				CHECK(dns_dbiterator_last(dbit));
			}
			CHECK(dns_dbiterator_current(dbit, &node, prev));
			CHECK(dns_dbiterator_pause(dbit));
			result = dns_db_findrdataset(db, node, version,
						     dns_rdatatype_nsec3, 0,
						     (isc_stdtime_t) 0,
						     &rdataset, NULL);
			dns_db_detachnode(db, &node);
			if (result != ISC_R_SUCCESS)
				continue;
			result = find_nsec3(&nsec3, &rdataset, nsec3param);
			if (result == ISC_R_NOMORE) {
				dns_rdataset_disassociate(&rdataset);
				continue;
			}
			if (result != ISC_R_SUCCESS)
				goto failure;

			old_next = nsec3.next;
			old_length = nsec3.next_length;

			/*
			 * Delete the old previous NSEC3.
			 */
			CHECK(delete(db, version, prev, nsec3param, diff));

			/*
			 * Fixup the previous NSEC3.
			 */
			nsec3.next = nexthash;
			nsec3.next_length = next_length;
			isc_buffer_init(&buffer, nsec3buf,
					sizeof(nsec3buf));
			CHECK(dns_rdata_fromstruct(&rdata, rdataset.rdclass,
						   dns_rdatatype_nsec3, &nsec3,
						   &buffer));
			CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD,
						   prev, rdataset.ttl, &rdata,
						   &tuple));
			CHECK(do_one_tuple(&tuple, db, version, diff));
			INSIST(old_length <= sizeof(nexthash));
			memcpy(nexthash, old_next, old_length);
			if (!CREATE(nsec3param->flags))
				flags = nsec3.flags;
			dns_rdata_reset(&rdata);
			dns_rdataset_disassociate(&rdataset);
			break;
		} while (pass < 2);

		INSIST(pass < 2);

		/*
		 * Create the NSEC3 RDATA for the empty node.
		 */
		CHECK(dns_nsec3_buildrdata(db, version, NULL, hash, flags,
					   iterations, salt, salt_length,
					   nexthash, next_length, nsec3buf,
					   &rdata));
		/*
		 * Delete the old NSEC3 and record the change.
		 */
		CHECK(delete(db, version, hashname, nsec3param, diff));

		/*
		 * Add the new NSEC3 and record the change.
		 */
		CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD,
					   hashname, nsecttl, &rdata, &tuple));
		CHECK(do_one_tuple(&tuple, db, version, diff));
		INSIST(tuple == NULL);
		dns_rdata_reset(&rdata);
		dns_db_detachnode(db, &newnode);
	} while (1);

	if (result == ISC_R_NOMORE)
		result = ISC_R_SUCCESS;

 failure:
	if (dbit != NULL)
		dns_dbiterator_destroy(&dbit);
	if (dns_rdataset_isassociated(&rdataset))
		dns_rdataset_disassociate(&rdataset);
	if (node != NULL)
		dns_db_detachnode(db, &node);
	if (newnode != NULL)
		dns_db_detachnode(db, &newnode);
	return (result);
}

/*%
 * Add NSEC3 records for "name", recording the change in "diff".
 * The existing NSEC3 records are removed.
 */
isc_result_t
dns_nsec3_addnsec3s(dns_db_t *db, dns_dbversion_t *version,
		    dns_name_t *name, dns_ttl_t nsecttl,
		    isc_boolean_t unsecure, dns_diff_t *diff)
{
	dns_dbnode_t *node = NULL;
	dns_rdata_nsec3param_t nsec3param;
	dns_rdataset_t rdataset;
	isc_result_t result;

	dns_rdataset_init(&rdataset);

	/*
	 * Find the NSEC3 parameters for this zone.
	 */
	result = dns_db_getoriginnode(db, &node);
	if (result != ISC_R_SUCCESS)
		return (result);

	result = dns_db_findrdataset(db, node, version,
				     dns_rdatatype_nsec3param, 0, 0,
				     &rdataset, NULL);
	dns_db_detachnode(db, &node);
	if (result == ISC_R_NOTFOUND)
		return (ISC_R_SUCCESS);
	if (result != ISC_R_SUCCESS)
		return (result);

	/*
	 * Update each active NSEC3 chain.
	 */
	for (result = dns_rdataset_first(&rdataset);
	     result == ISC_R_SUCCESS;
	     result = dns_rdataset_next(&rdataset)) {
		dns_rdata_t rdata = DNS_RDATA_INIT;

		dns_rdataset_current(&rdataset, &rdata);
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		CHECK(dns_rdata_tostruct(&rdata, &nsec3param, NULL));
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		if (nsec3param.flags != 0)
			continue;
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		/*
		 * We have a active chain.  Update it.
		 */
		CHECK(dns_nsec3_addnsec3(db, version, name, &nsec3param,
					 nsecttl, unsecure, diff));
	}
	if (result == ISC_R_NOMORE)
		result = ISC_R_SUCCESS;

 failure:
	if (dns_rdataset_isassociated(&rdataset))
		dns_rdataset_disassociate(&rdataset);
	if (node != NULL)
		dns_db_detachnode(db, &node);

	return (result);
}

isc_boolean_t
dns_nsec3param_fromprivate(dns_rdata_t *src, dns_rdata_t *target,
			   unsigned char *buf, size_t buflen)
{
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	dns_decompress_t dctx;
	isc_result_t result;
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	isc_buffer_t buf1;
	isc_buffer_t buf2;

	/*
	 * Algorithm 0 (reserved by RFC 4034) is used to identify
	 * NSEC3PARAM records from DNSKEY pointers.
	 */
	if (src->length < 1 || src->data[0] != 0)
		return (ISC_FALSE);

	isc_buffer_init(&buf1, src->data + 1, src->length - 1);
	isc_buffer_add(&buf1, src->length - 1);
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	isc_buffer_setactive(&buf1, src->length - 1);
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	isc_buffer_init(&buf2, buf, buflen);
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	dns_decompress_init(&dctx, -1, DNS_DECOMPRESS_NONE);
	result = dns_rdata_fromwire(target, src->rdclass,
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				    dns_rdatatype_nsec3param,
				    &buf1, &dctx, 0, &buf2);
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	dns_decompress_invalidate(&dctx);
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	return (ISC_TF(result == ISC_R_SUCCESS));
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}

void
dns_nsec3param_toprivate(dns_rdata_t *src, dns_rdata_t *target,
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			 dns_rdatatype_t privatetype,
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			 unsigned char *buf, size_t buflen)
{
	REQUIRE(buflen >= src->length + 1);

	REQUIRE(DNS_RDATA_INITIALIZED(target));

	memcpy(buf + 1, src->data, src->length);
	buf[0] = 0;
	target->data = buf;
	target->length = src->length + 1;
	target->type = privatetype;
	target->rdclass = src->rdclass;
	target->flags = 0;
	ISC_LINK_INIT(target, link);
}

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#ifdef BIND9
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static isc_result_t
rr_exists(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
	  const dns_rdata_t *rdata, isc_boolean_t *flag)
{
	dns_rdataset_t rdataset;
	dns_dbnode_t *node = NULL;
	isc_result_t result;
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	dns_rdataset_init(&rdataset);
	if (rdata->type == dns_rdatatype_nsec3)
		CHECK(dns_db_findnsec3node(db, name, ISC_FALSE, &node));
	else
		CHECK(dns_db_findnode(db, name, ISC_FALSE, &node));
	result = dns_db_findrdataset(db, node, ver, rdata->type, 0,
				     (isc_stdtime_t) 0, &rdataset, NULL);
	if (result == ISC_R_NOTFOUND) {
		*flag = ISC_FALSE;
		result = ISC_R_SUCCESS;
		goto failure;
	}

	for (result = dns_rdataset_first(&rdataset);
	     result == ISC_R_SUCCESS;
	     result = dns_rdataset_next(&rdataset)) {
		dns_rdata_t myrdata = DNS_RDATA_INIT;
		dns_rdataset_current(&rdataset, &myrdata);
		if (!dns_rdata_casecompare(&myrdata, rdata))
			break;
	}
	dns_rdataset_disassociate(&rdataset);
	if (result == ISC_R_SUCCESS) {
		*flag = ISC_TRUE;
	} else if (result == ISC_R_NOMORE) {
		*flag = ISC_FALSE;
		result = ISC_R_SUCCESS;
	}

 failure:
	if (node != NULL)
		dns_db_detachnode(db, &node);
	return (result);
}
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#ifdef BIND9
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isc_result_t
dns_nsec3param_deletechains(dns_db_t *db, dns_dbversion_t *ver,
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			    dns_zone_t *zone, isc_boolean_t nonsec,
			    dns_diff_t *diff)
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{
	dns_dbnode_t *node = NULL;
	dns_difftuple_t *tuple = NULL;
	dns_name_t next;
	dns_rdata_t rdata = DNS_RDATA_INIT;
	dns_rdataset_t rdataset;
	isc_boolean_t flag;
	isc_result_t result = ISC_R_SUCCESS;
	unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE + 1];
	dns_name_t *origin = dns_zone_getorigin(zone);
	dns_rdatatype_t privatetype = dns_zone_getprivatetype(zone);

	dns_name_init(&next, NULL);
	dns_rdataset_init(&rdataset);

	result = dns_db_getoriginnode(db, &node);
	if (result != ISC_R_SUCCESS)
		return (result);

	/*
	 * Cause all NSEC3 chains to be deleted.
	 */
	result = dns_db_findrdataset(db, node, ver, dns_rdatatype_nsec3param,
				     0, (isc_stdtime_t) 0, &rdataset, NULL);
	if (result == ISC_R_NOTFOUND)
		goto try_private;
	if (result != ISC_R_SUCCESS)
		goto failure;

	for (result = dns_rdataset_first(&rdataset);
	     result == ISC_R_SUCCESS;
	     result = dns_rdataset_next(&rdataset)) {
		dns_rdata_t private = DNS_RDATA_INIT;

		dns_rdataset_current(&rdataset, &rdata);

		CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_DEL, origin,
					   rdataset.ttl, &rdata, &tuple));
		CHECK(do_one_tuple(&tuple, db, ver, diff));
		INSIST(tuple == NULL);

		dns_nsec3param_toprivate(&rdata, &private, privatetype,
					 buf, sizeof(buf));
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		buf[2] = DNS_NSEC3FLAG_REMOVE;
		if (nonsec)
			buf[2] |= DNS_NSEC3FLAG_NONSEC;
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		CHECK(rr_exists(db, ver, origin, &private, &flag));

		if (!flag) {
			CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD,
						   origin, 0, &private,
						   &tuple));
			CHECK(do_one_tuple(&tuple, db, ver, diff));
			INSIST(tuple == NULL);
		}
		dns_rdata_reset(&rdata);
	}
	if (result != ISC_R_NOMORE)
		goto failure;

	dns_rdataset_disassociate(&rdataset);

 try_private:
	if (privatetype == 0)
		goto success;
	result = dns_db_findrdataset(db, node, ver, privatetype, 0,
				     (isc_stdtime_t) 0, &rdataset, NULL);
	if (result == ISC_R_NOTFOUND)
		goto success;
	if (result != ISC_R_SUCCESS)
		goto failure;

	for (result = dns_rdataset_first(&rdataset);
	     result == ISC_R_SUCCESS;
	     result = dns_rdataset_next(&rdataset)) {
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		dns_rdata_reset(&rdata);
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		dns_rdataset_current(&rdataset, &rdata);
		INSIST(rdata.length <= sizeof(buf));
		memcpy(buf, rdata.data, rdata.length);

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		if (buf[0] != 0 || (buf[2] & DNS_NSEC3FLAG_REMOVE) != 0 ||
		    (nonsec && (buf[2] & DNS_NSEC3FLAG_NONSEC) != 0))
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			continue;

		CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_DEL, origin,
					   0, &rdata, &tuple));
		CHECK(do_one_tuple(&tuple, db, ver, diff));
		INSIST(tuple == NULL);

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		rdata.data = buf;
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		buf[2] = DNS_NSEC3FLAG_REMOVE;
		if (nonsec)
			buf[2] |= DNS_NSEC3FLAG_NONSEC;
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		CHECK(rr_exists(db, ver, origin, &rdata, &flag));

		if (!flag) {
			CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD,
						   origin, 0, &rdata, &tuple));
			CHECK(do_one_tuple(&tuple, db, ver, diff));
			INSIST(tuple == NULL);
		}
	}
	if (result != ISC_R_NOMORE)
		goto failure;
 success:
	result = ISC_R_SUCCESS;

 failure:
	if (dns_rdataset_isassociated(&rdataset))
		dns_rdataset_disassociate(&rdataset);
	dns_db_detachnode(db, &node);
	return (result);
}
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#endif
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isc_result_t
dns_nsec3_addnsec3sx(dns_db_t *db, dns_dbversion_t *version,
		     dns_name_t *name, dns_ttl_t nsecttl,
		     isc_boolean_t unsecure, dns_rdatatype_t type,
		     dns_diff_t *diff)
{
	dns_dbnode_t *node = NULL;
	dns_rdata_nsec3param_t nsec3param;
	dns_rdataset_t rdataset;
	dns_rdataset_t prdataset;
	isc_result_t result;

	dns_rdataset_init(&rdataset);
	dns_rdataset_init(&prdataset);

	/*
	 * Find the NSEC3 parameters for this zone.
	 */
	result = dns_db_getoriginnode(db, &node);
	if (result != ISC_R_SUCCESS)
		return (result);

	result = dns_db_findrdataset(db, node, version, type, 0, 0,
				     &prdataset, NULL);
	if (result != ISC_R_SUCCESS && result != ISC_R_NOTFOUND)
		goto failure;

	result = dns_db_findrdataset(db, node, version,
				     dns_rdatatype_nsec3param, 0, 0,
				     &rdataset, NULL);
	if (result == ISC_R_NOTFOUND)
		goto try_private;
	if (result != ISC_R_SUCCESS)
		goto failure;

	/*
	 * Update each active NSEC3 chain.
	 */
	for (result = dns_rdataset_first(&rdataset);
	     result == ISC_R_SUCCESS;
	     result = dns_rdataset_next(&rdataset)) {
		dns_rdata_t rdata = DNS_RDATA_INIT;

		dns_rdataset_current(&rdataset, &rdata);
		CHECK(dns_rdata_tostruct(&rdata, &nsec3param, NULL));

		if (nsec3param.flags != 0)
			continue;

		/*
		 * We have a active chain.  Update it.
		 */
		CHECK(dns_nsec3_addnsec3(db, version, name, &nsec3param,
					 nsecttl, unsecure, diff));
	}
	if (result != ISC_R_NOMORE)
		goto failure;

	dns_rdataset_disassociate(&rdataset);

 try_private:
	if (!dns_rdataset_isassociated(&prdataset))
		goto success;
	/*
	 * Update each active NSEC3 chain.
	 */
	for (result = dns_rdataset_first(&prdataset);
	     result == ISC_R_SUCCESS;
	     result = dns_rdataset_next(&prdataset)) {
		dns_rdata_t rdata1 = DNS_RDATA_INIT;
		dns_rdata_t rdata2 = DNS_RDATA_INIT;
		unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE];

		dns_rdataset_current(&prdataset, &rdata1);
		if (!dns_nsec3param_fromprivate(&rdata1, &rdata2,
						buf, sizeof(buf)))
			continue;
		CHECK(dns_rdata_tostruct(&rdata2, &nsec3param, NULL));

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		if ((nsec3param.flags & DNS_NSEC3FLAG_REMOVE) != 0)
			continue;
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		if (better_param(&prdataset, &rdata2))
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			continue;

		/*
		 * We have a active chain.  Update it.
		 */
		CHECK(dns_nsec3_addnsec3(db, version, name, &nsec3param,
					 nsecttl, unsecure, diff));
	}
	if (result == ISC_R_NOMORE)
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		result = ISC_R_SUCCESS;
 failure:
	if (dns_rdataset_isassociated(&rdataset))
		dns_rdataset_disassociate(&rdataset);
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	if (dns_rdataset_isassociated(&prdataset))
		dns_rdataset_disassociate(&prdataset);
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	if (node != NULL)
		dns_db_detachnode(db, &node);

	return (result);
}

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/*%
 * Determine whether any NSEC3 records that were associated with
 * 'name' should be deleted or if they should continue to exist.
 * ISC_TRUE indicates they should be deleted.
 * ISC_FALSE indicates they should be retained.
 */
static isc_result_t
deleteit(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
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	 isc_boolean_t *yesno)
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{
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	isc_result_t result;
	dns_fixedname_t foundname;
	dns_fixedname_init(&foundname);

	result = dns_db_find(db, name, ver, dns_rdatatype_any,
			     DNS_DBFIND_GLUEOK | DNS_DBFIND_NOWILD,
			     (isc_stdtime_t) 0, NULL,
			     dns_fixedname_name(&foundname),
			     NULL, NULL);
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	if (result == DNS_R_EMPTYNAME || result == ISC_R_SUCCESS ||
	    result ==  DNS_R_ZONECUT) {
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		*yesno = ISC_FALSE;
		return (ISC_R_SUCCESS);
	}
	if (result == DNS_R_GLUE || result == DNS_R_DNAME ||
	    result == DNS_R_DELEGATION || result == DNS_R_NXDOMAIN) {
		*yesno = ISC_TRUE;
		return (ISC_R_SUCCESS);
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	}
	/*
	 * Silence compiler.
	 */
	*yesno = ISC_TRUE;
	return (result);
}

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isc_result_t
dns_nsec3_delnsec3(dns_db_t *db, dns_dbversion_t *version, dns_name_t *name,
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		   const dns_rdata_nsec3param_t *nsec3param, dns_diff_t *diff)
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{
	dns_dbiterator_t *dbit = NULL;
	dns_dbnode_t *node = NULL;
	dns_difftuple_t *tuple = NULL;
	dns_fixedname_t fixed;
	dns_fixedname_t fprev;
	dns_hash_t hash;
	dns_name_t *hashname;
	dns_name_t *origin;
	dns_name_t *prev;
	dns_name_t empty;
	dns_rdata_nsec3_t nsec3;
	dns_rdata_t rdata = DNS_RDATA_INIT;
	dns_rdataset_t rdataset;
	int pass;
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	isc_boolean_t yesno;
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	isc_buffer_t buffer;
	isc_result_t result;
	unsigned char *salt;
	unsigned char nexthash[NSEC3_MAX_HASH_LENGTH];
	unsigned char nsec3buf[DNS_NSEC3_BUFFERSIZE];
	unsigned int iterations;
	unsigned int labels;
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	size_t next_length;
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	unsigned int salt_length;

	dns_fixedname_init(&fixed);
	hashname = dns_fixedname_name(&fixed);
	dns_fixedname_init(&fprev);
	prev = dns_fixedname_name(&fprev);

	dns_rdataset_init(&rdataset);

	origin = dns_db_origin(db);

	/*
	 * Chain parameters.
	 */
	hash = nsec3param->hash;
	iterations = nsec3param->iterations;
	salt_length = nsec3param->salt_length;
	salt = nsec3param->salt;

	/*
	 * If this is the first NSEC3 in the chain nexthash will
	 * remain pointing to itself.
	 */
	next_length = sizeof(nexthash);
	CHECK(dns_nsec3_hashname(&fixed, nexthash, &next_length,
				 name, origin, hash, iterations,
				 salt, salt_length));

	CHECK(dns_db_createiterator(db, DNS_DB_NSEC3ONLY, &dbit));

	result = dns_dbiterator_seek(dbit, hashname);
	if (result == ISC_R_NOTFOUND)
		goto success;
	if (result != ISC_R_SUCCESS)
		goto failure;

	CHECK(dns_dbiterator_current(dbit, &node, NULL));
	CHECK(dns_dbiterator_pause(dbit));
	result = dns_db_findrdataset(db, node, version, dns_rdatatype_nsec3,
				     0, (isc_stdtime_t) 0, &rdataset, NULL);
	dns_db_detachnode(db, &node);
	if (result == ISC_R_NOTFOUND)
		goto success;
	if (result != ISC_R_SUCCESS)
		goto failure;

	/*
	 * If we find a existing NSEC3 for this chain then save the
	 * next field.
	 */
	result = find_nsec3(&nsec3, &rdataset, nsec3param);
	if (result == ISC_R_SUCCESS) {
		next_length = nsec3.next_length;
		INSIST(next_length <= sizeof(nexthash));
		memcpy(nexthash, nsec3.next, next_length);
	}
	dns_rdataset_disassociate(&rdataset);
	if (result == ISC_R_NOMORE)
		goto success;
	if (result != ISC_R_SUCCESS)
		goto failure;

	/*
	 * Find the previous NSEC3 and update it.
	 */
	pass = 0;
	do {
		result = dns_dbiterator_prev(dbit);
		if (result == ISC_R_NOMORE) {
			pass++;
			CHECK(dns_dbiterator_last(dbit));
		}
		CHECK(dns_dbiterator_current(dbit, &node, prev));
		CHECK(dns_dbiterator_pause(dbit));
		result = dns_db_findrdataset(db, node, version,
					     dns_rdatatype_nsec3, 0,
					     (isc_stdtime_t) 0, &rdataset,
					     NULL);
		dns_db_detachnode(db, &node);
		if (result != ISC_R_SUCCESS)
			continue;
		result = find_nsec3(&nsec3, &rdataset, nsec3param);
		if (result == ISC_R_NOMORE) {
			dns_rdataset_disassociate(&rdataset);
			continue;
		}
		if (result != ISC_R_SUCCESS)
			goto failure;

		/*
		 * Delete the old previous NSEC3.
		 */
		CHECK(delete(db, version, prev, nsec3param, diff));

		/*
		 * Fixup the previous NSEC3.
		 */
		nsec3.next = nexthash;
		nsec3.next_length = next_length;
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		if (CREATE(nsec3param->flags))
			nsec3.flags = nsec3param->flags & DNS_NSEC3FLAG_OPTOUT;
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		isc_buffer_init(&buffer, nsec3buf, sizeof(nsec3buf));
		CHECK(dns_rdata_fromstruct(&rdata, rdataset.rdclass,
					   dns_rdatatype_nsec3, &nsec3,
					   &buffer));
		CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, prev,
					   rdataset.ttl, &rdata, &tuple));
		CHECK(do_one_tuple(&tuple, db, version, diff));
		dns_rdata_reset(&rdata);
		dns_rdataset_disassociate(&rdataset);
		break;
	} while (pass < 2);

	/*
	 * Delete the old NSEC3 and record the change.
	 */
	CHECK(delete(db, version, hashname, nsec3param, diff));

	/*
	 *  Delete NSEC3 records for now non active nodes.
	 */
	dns_name_init(&empty, NULL);
	dns_name_clone(name, &empty);
	do {
		labels = dns_name_countlabels(&empty) - 1;
		if (labels <= dns_name_countlabels(origin))
			break;
		dns_name_getlabelsequence(&empty, 1, labels, &empty);
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		CHECK(deleteit(db, version, &empty, &yesno));
		if (!yesno)
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			break;

		CHECK(dns_nsec3_hashname(&fixed, nexthash, &next_length,
					 &empty, origin, hash, iterations,
					 salt, salt_length));
		result = dns_dbiterator_seek(dbit, hashname);
		if (result == ISC_R_NOTFOUND)
			goto success;
		if (result != ISC_R_SUCCESS)
			goto failure;

		CHECK(dns_dbiterator_current(dbit, &node, NULL));
		CHECK(dns_dbiterator_pause(dbit));
		result = dns_db_findrdataset(db, node, version,
					     dns_rdatatype_nsec3, 0,
					     (isc_stdtime_t) 0, &rdataset,
					     NULL);
		dns_db_detachnode(db, &node);
		if (result == ISC_R_NOTFOUND)
			goto success;
		if (result != ISC_R_SUCCESS)
			goto failure;

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		result = find_nsec3(&nsec3, &rdataset, nsec3param);
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		if (result == ISC_R_SUCCESS) {
			next_length = nsec3.next_length;
			INSIST(next_length <= sizeof(nexthash));
			memcpy(nexthash, nsec3.next, next_length);
		}
		dns_rdataset_disassociate(&rdataset);
		if (result == ISC_R_NOMORE)
			goto success;
		if (result != ISC_R_SUCCESS)
			goto failure;

		pass = 0;
		do {
			result = dns_dbiterator_prev(dbit);
			if (result == ISC_R_NOMORE) {
				pass++;
				CHECK(dns_dbiterator_last(dbit));
			}
			CHECK(dns_dbiterator_current(dbit, &node, prev));
			CHECK(dns_dbiterator_pause(dbit));
			result = dns_db_findrdataset(db, node, version,
						     dns_rdatatype_nsec3, 0,
						     (isc_stdtime_t) 0,
						     &rdataset, NULL);
			dns_db_detachnode(db, &node);
			if (result != ISC_R_SUCCESS)
				continue;
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			result = find_nsec3(&nsec3, &rdataset, nsec3param);
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			if (result == ISC_R_NOMORE) {
				dns_rdataset_disassociate(&rdataset);
				continue;
			}
			if (result != ISC_R_SUCCESS)
				goto failure;

			/*
			 * Delete the old previous NSEC3.
			 */
			CHECK(delete(db, version, prev, nsec3param, diff));

			/*
			 * Fixup the previous NSEC3.
			 */
			nsec3.next = nexthash;
			nsec3.next_length = next_length;
			isc_buffer_init(&buffer, nsec3buf,
					sizeof(nsec3buf));
			CHECK(dns_rdata_fromstruct(&rdata, rdataset.rdclass,
						   dns_rdatatype_nsec3, &nsec3,
						   &buffer));
			CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD,
						   prev, rdataset.ttl, &rdata,
						   &tuple));
			CHECK(do_one_tuple(&tuple, db, version, diff));
			dns_rdata_reset(&rdata);
			dns_rdataset_disassociate(&rdataset);
			break;
		} while (pass < 2);

		INSIST(pass < 2);

		/*
		 * Delete the old NSEC3 and record the change.
		 */
		CHECK(delete(db, version, hashname, nsec3param, diff));
	} while (1);

 success:
	result = ISC_R_SUCCESS;

 failure:
	if (dbit != NULL)
		dns_dbiterator_destroy(&dbit);
	if (dns_rdataset_isassociated(&rdataset))
		dns_rdataset_disassociate(&rdataset);
	if (node != NULL)
		dns_db_detachnode(db, &node);
	return (result);
}

isc_result_t
dns_nsec3_delnsec3s(dns_db_t *db, dns_dbversion_t *version, dns_name_t *name,
		    dns_diff_t *diff)
1580
1581
1582
1583
1584
1585
{
	return (dns_nsec3_delnsec3sx(db, version, name, 0, diff));
}

isc_result_t
dns_nsec3_delnsec3sx(dns_db_t *db, dns_dbversion_t *version, dns_name_t *name,
1586
		     dns_rdatatype_t privatetype, dns_diff_t *diff)
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
{
	dns_dbnode_t *node = NULL;
	dns_rdata_nsec3param_t nsec3param;
	dns_rdataset_t rdataset;
	isc_result_t result;

	dns_rdataset_init(&rdataset);

	/*
	 * Find the NSEC3 parameters for this zone.
	 */
	result = dns_db_getoriginnode(db, &node);
	if (result != ISC_R_SUCCESS)
		return (result);

	result = dns_db_findrdataset(db, node, version,
				     dns_rdatatype_nsec3param, 0, 0,
				     &rdataset, NULL);
	if (result == ISC_R_NOTFOUND)
1606
		goto try_private;
1607
	if (result != ISC_R_SUCCESS)
1608
		goto failure;
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618

	/*
	 * Update each active NSEC3 chain.
	 */
	for (result = dns_rdataset_first(&rdataset);
	     result == ISC_R_SUCCESS;
	     result = dns_rdataset_next(&rdataset)) {
		dns_rdata_t rdata = DNS_RDATA_INIT;

		dns_rdataset_current(&rdataset, &rdata);
1619
		CHECK(dns_rdata_tostruct(&rdata, &nsec3param, NULL));
1620
1621
1622

		if (nsec3param.flags != 0)
			continue;
1623
1624
1625
1626
1627
		/*
		 * We have a active chain.  Update it.
		 */
		CHECK(dns_nsec3_delnsec3(db, version, name, &nsec3param, diff));
	}
1628
	dns_rdataset_disassociate(&rdataset);
1629
1630

 try_private:
1631
	if (privatetype == 0)
1632
		goto success;
1633
	result = dns_db_findrdataset(db, node, version, privatetype, 0, 0,
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
				     &rdataset, NULL);
	if (result == ISC_R_NOTFOUND)
		goto success;
	if (result != ISC_R_SUCCESS)
		goto failure;

	/*
	 * Update each NSEC3 chain being built.
	 */
	for (result = dns_rdataset_first(&rdataset);
	     result == ISC_R_SUCCESS;
	     result = dns_rdataset_next(&rdataset)) {
		dns_rdata_t rdata1 = DNS_RDATA_INIT;
		dns_rdata_t rdata2 = DNS_RDATA_INIT;
		unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE];

		dns_rdataset_current(&rdataset, &rdata1);
		if (!dns_nsec3param_fromprivate(&rdata1,  &rdata2,
						buf, sizeof(buf)))
			continue;
		CHECK(dns_rdata_tostruct(&rdata2, &nsec3param, NULL));

1656
1657
		if ((nsec3param.flags & DNS_NSEC3FLAG_REMOVE) != 0)
			continue;
1658
		if (better_param(&rdataset, &rdata2))
1659
1660
1661
1662
1663
1664
1665
1666
			continue;

		/*
		 * We have a active chain.  Update it.
		 */
		CHECK(dns_nsec3_delnsec3(db, version, name, &nsec3param, diff));
	}
	if (result == ISC_R_NOMORE)
1667
 success:
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
		result = ISC_R_SUCCESS;

 failure:
	if (dns_rdataset_isassociated(&rdataset))
		dns_rdataset_disassociate(&rdataset);
	if (node != NULL)
		dns_db_detachnode(db, &node);

	return (result);
}

isc_result_t
dns_nsec3_active(dns_db_t *db, dns_dbversion_t *version,
		 isc_boolean_t complete, isc_boolean_t *answer)
1682
1683
1684
1685
1686
1687
{
	return (dns_nsec3_activex(db, version, complete, 0, answer));
}

isc_result_t
dns_nsec3_activex(dns_db_t *db, dns_dbversion_t *version,
1688
		  isc_boolean_t complete, dns_rdatatype_t privatetype,
1689
		  isc_boolean_t *answer)
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
{
	dns_dbnode_t *node = NULL;
	dns_rdataset_t rdataset;
	dns_rdata_nsec3param_t nsec3param;
	isc_result_t result;

	REQUIRE(answer != NULL);

	dns_rdataset_init(&rdataset);

	result = dns_db_getoriginnode(db, &node);
	if (result != ISC_R_SUCCESS)
		return (result);

	result = dns_db_findrdataset(db, node, version,
				     dns_rdatatype_nsec3param, 0, 0,
				     &rdataset, NULL);

1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
	if (result == ISC_R_NOTFOUND)
		goto try_private;

	if (result != ISC_R_SUCCESS) {
		dns_db_detachnode(db, &node);
		return (result);
	}
	for (result = dns_rdataset_first(&rdataset);
	     result == ISC_R_SUCCESS;
	     result = dns_rdataset_next(&rdataset)) {
		dns_rdata_t rdata = DNS_RDATA_INIT;

		dns_rdataset_current(&rdataset, &rdata);
		result = dns_rdata_tostruct(&rdata, &nsec3param, NULL);
		RUNTIME_CHECK(result == ISC_R_SUCCESS);

		if (nsec3param.flags == 0)
			break;
	}
	dns_rdataset_disassociate(&rdataset);
	if (result == ISC_R_SUCCESS) {
		dns_db_detachnode(db, &node);
		*answer = ISC_TRUE;
		return (ISC_R_SUCCESS);
	}
	if (result == ISC_R_NOMORE)
		*answer = ISC_FALSE;

 try_private:
1737
	if (privatetype == 0 || complete) {
1738
1739
1740
		*answer = ISC_FALSE;
		return (ISC_R_SUCCESS);
	}
1741
	result = dns_db_findrdataset(db, node, version, privatetype, 0, 0,
1742
1743
1744
				     &rdataset, NULL);

	dns_db_detachnode(db, &node);
1745
1746
1747
1748
1749
1750
	if (result == ISC_R_NOTFOUND) {
		*answer = ISC_FALSE;
		return (ISC_R_SUCCESS);
	}
	if (result != ISC_R_SUCCESS)
		return (result);
1751

1752
1753
1754
	for (result = dns_rdataset_first(&rdataset);
	     result == ISC_R_SUCCESS;
	     result = dns_rdataset_next(&rdataset)) {
1755
1756
1757
		dns_rdata_t rdata1 = DNS_RDATA_INIT;
		dns_rdata_t rdata2 = DNS_RDATA_INIT;
		unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE];
1758

1759
1760
1761
1762
1763
		dns_rdataset_current(&rdataset, &rdata1);
		if (!dns_nsec3param_fromprivate(&rdata1, &rdata2,
						buf, sizeof(buf)))
			continue;
		result = dns_rdata_tostruct(&rdata2, &nsec3param, NULL);
1764
1765
		RUNTIME_CHECK(result == ISC_R_SUCCESS);

1766
		if (!complete && CREATE(nsec3param.flags))
1767
1768
1769
			break;
	}
	dns_rdataset_disassociate(&rdataset);
1770
	if (result == ISC_R_SUCCESS) {
1771
		*answer = ISC_TRUE;
1772
1773
		result = ISC_R_SUCCESS;
	}
1774
1775
1776
1777
	if (result == ISC_R_NOMORE) {
		*answer = ISC_FALSE;
		result = ISC_R_SUCCESS;
	}
1778

1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
	return (result);
}

isc_result_t
dns_nsec3_maxiterations(dns_db_t *db, dns_dbversion_t *version,
			isc_mem_t *mctx, unsigned int *iterationsp)
{
	dns_dbnode_t *node = NULL;
	dns_rdataset_t rdataset;
	dst_key_t *key = NULL;
	isc_buffer_t buffer;
	isc_result_t result;
1791
	unsigned int bits, minbits = 4096;
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817

	result = dns_db_getoriginnode(db, &node);
	if (result != ISC_R_SUCCESS)
		return (result);

	dns_rdataset_init(&rdataset);
	result = dns_db_findrdataset(db, node, version, dns_rdatatype_dnskey,
				     0, 0, &rdataset, NULL);
	dns_db_detachnode(db, &node);
	if (result == ISC_R_NOTFOUND) {
		*iterationsp = 0;
		return (ISC_R_SUCCESS);
	}
	if (result != ISC_R_SUCCESS)
		goto failure;

	for (result = dns_rdataset_first(&rdataset);
	     result == ISC_R_SUCCESS;
	     result = dns_rdataset_next(&rdataset)) {
		dns_rdata_t rdata = DNS_RDATA_INIT;

		dns_rdataset_current(&rdataset, &rdata);
		isc_buffer_init(&buffer, rdata.data, rdata.length);
		isc_buffer_add(&buffer, rdata.length);
		CHECK(dst_key_fromdns(dns_db_origin(db), rdataset.rdclass,
				      &buffer, mctx, &key));
1818
		bits = dst_key_size(key);
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
		dst_key_free(&key);
		if (minbits > bits)
			minbits = bits;
	}
	if (result != ISC_R_NOMORE)
		goto failure;

	if (minbits <= 1024)
		*iterationsp = 150;
	else if (minbits <= 2048)
		*iterationsp = 500;
	else
		*iterationsp = 2500;
	result = ISC_R_SUCCESS;

 failure:
	if (dns_rdataset_isassociated(&rdataset))
		dns_rdataset_disassociate(&rdataset);
	return (result);
}