/*

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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")

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*

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* This Source Code Form is subject to the terms of the Mozilla Public

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* License, v. 2.0. If a copy of the MPL was not distributed with this

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* file, you can obtain one at https://mozilla.org/MPL/2.0/.

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*

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* See the COPYRIGHT file distributed with this work for additional

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* information regarding copyright ownership.

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*/

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#ifndef DNS_NSEC_H

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#define DNS_NSEC_H 1

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/*! \file dns/nsec.h */

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#include <stdbool.h>

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#include <isc/lang.h>

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#include <dns/types.h>

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#include <dns/name.h>

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#define DNS_NSEC_BUFFERSIZE (DNS_NAME_MAXWIRE + 8192 + 512)

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ISC_LANG_BEGINDECLS

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isc_result_t

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dns_nsec_buildrdata(dns_db_t *db, dns_dbversion_t *version,

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dns_dbnode_t *node, dns_name_t *target,

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unsigned char *buffer, dns_rdata_t *rdata);

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/*%<

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* Build the rdata of a NSEC record.

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*

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* Requires:

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*\li buffer Points to a temporary buffer of at least

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* DNS_NSEC_BUFFERSIZE bytes.

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*\li rdata Points to an initialized dns_rdata_t.

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*

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* Ensures:

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* \li *rdata Contains a valid NSEC rdata. The 'data' member refers

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* to 'buffer'.

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*/

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isc_result_t

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dns_nsec_build(dns_db_t *db, dns_dbversion_t *version, dns_dbnode_t *node,

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dns_name_t *target, dns_ttl_t ttl);

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/*%<

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* Build a NSEC record and add it to a database.

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*/

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bool

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dns_nsec_typepresent(dns_rdata_t *nsec, dns_rdatatype_t type);

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/*%<

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* Determine if a type is marked as present in an NSEC record.

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*

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* Requires:

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*\li 'nsec' points to a valid rdataset of type NSEC

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*/

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isc_result_t

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dns_nsec_nseconly(dns_db_t *db, dns_dbversion_t *version,

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bool *answer);

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/*

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* Report whether the DNSKEY RRset has a NSEC only algorithm. Unknown

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* algorithms are assumed to support NSEC3. If DNSKEY is not found,

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* *answer is set to false, and ISC_R_NOTFOUND is returned.

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*

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* Requires:

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* 'answer' to be non NULL.

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*/

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unsigned int

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dns_nsec_compressbitmap(unsigned char *map, const unsigned char *raw,

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unsigned int max_type);

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/*%<

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* Convert a raw bitmap into a compressed windowed bit map. 'map' and 'raw'

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* may overlap.

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*

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* Returns the length of the compressed windowed bit map.

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*/

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void

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dns_nsec_setbit(unsigned char *array, unsigned int type, unsigned int bit);

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/*%<

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* Set type bit in raw 'array' to 'bit'.

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*/

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bool

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dns_nsec_isset(const unsigned char *array, unsigned int type);

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/*%<

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* Test if the corresponding 'type' bit is set in 'array'.

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*/

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isc_result_t

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dns_nsec_noexistnodata(dns_rdatatype_t type, dns_name_t *name,

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dns_name_t *nsecname, dns_rdataset_t *nsecset,

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bool *exists, bool *data,

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dns_name_t *wild, dns_nseclog_t log, void *arg);

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/*%

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* Return ISC_R_SUCCESS if we can determine that the name doesn't exist

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* or we can determine whether there is data or not at the name.

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* If the name does not exist return the wildcard name.

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*

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* Return ISC_R_IGNORE when the NSEC is not the appropriate one.

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*/

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ISC_LANG_ENDDECLS

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#endif /* DNS_NSEC_H */

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