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/* Copyright (C) 2015-2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#include <libknot/packet/pkt.h>
/**
* Check bitmap that child names are contained in the same zone.
* @note see RFC6840 4.1.
* @param bm Bitmap from NSEC or NSEC3.
* @param bm_size Bitmap size.
* @return 0 if they are, >0 if not (abs(ENOENT)), <0 on error.
*/
int kr_nsec_children_in_zone_check(const uint8_t *bm, uint16_t bm_size);
/**
* Check an NSEC or NSEC3 bitmap for NODATA for a type.
* @param bm Bitmap.
* @param bm_size Bitmap size.
* @param type RR type to check.
* @param owner NSEC record owner.
* @note This includes special checks for zone cuts, e.g. from RFC 6840 sec. 4.
* @return 0, abs(ENOENT) (no proof), kr_error(EINVAL)
*/
int kr_nsec_bitmap_nodata_check(const uint8_t *bm, uint16_t bm_size, uint16_t type, const knot_dname_t *owner);
/**
* Name error response check (RFC4035 3.1.3.2; RFC4035 5.4, bullet 2).
* @note No RRSIGs are validated.
* @param pkt Packet structure to be processed.
* @param section_id Packet section to be processed.
* @param sname Name to be checked.
* @return 0 or error code.
*/
int kr_nsec_name_error_response_check(const knot_pkt_t *pkt, knot_section_t section_id,
const knot_dname_t *sname);
/**
* No data response check (RFC4035 3.1.3.1; RFC4035 5.4, bullet 1).
* @param pkt Packet structure to be processed.
* @param section_id Packet section to be processed.
* @param sname Name to be checked.
* @param stype Type to be checked.
* @return 0 or error code.
*/
int kr_nsec_no_data_response_check(const knot_pkt_t *pkt, knot_section_t section_id,
const knot_dname_t *sname, uint16_t stype);
/**
* Wildcard answer response check (RFC4035 3.1.3.3).
* @param pkt Packet structure to be processed.
* @param section_id Packet section to be processed.
* @param sname Name to be checked.
* @return 0 or error code.
*/
int kr_nsec_wildcard_answer_response_check(const knot_pkt_t *pkt, knot_section_t section_id,
const knot_dname_t *sname);
/**
* Authenticated denial of existence according to RFC4035 5.4.
* @note No RRSIGs are validated.
* @param pkt Packet structure to be processed.
* @param section_id Packet section to be processed.
* @param sname Queried domain name.
* @param stype Queried type.
* @return 0 or error code.
*/
int kr_nsec_existence_denial(const knot_pkt_t *pkt, knot_section_t section_id,
const knot_dname_t *sname, uint16_t stype);
/**
* Referral to unsigned subzone check (RFC4035 5.2).
* @note No RRSIGs are validated.
* @param pkt Packet structure to be processed.
* @return 0 or error code:
* DNSSEC_NOT_FOUND - neither ds nor nsec records
* were not found.
* EEXIST - ds record was found.
* EINVAL - bogus.
*/
int kr_nsec_ref_to_unsigned(const knot_pkt_t *pkt);
/**
* Checks whether supplied NSEC RR matches the supplied name and type.
* @param nsec NSEC RR.
* @param name Name to be checked.
* @param type Type to be checked. Only use with NS! TODO (+copy&paste NSEC3)
* @return 0 or error code.
*/
int kr_nsec_matches_name_and_type(const knot_rrset_t *nsec,
const knot_dname_t *name, uint16_t type);
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