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/* Copyright (C) CZ.NIC, z.s.p.o. <knot-resolver@labs.nic.cz>
* SPDX-License-Identifier: GPL-3.0-or-later
*/
#pragma once
#include <libknot/packet/pkt.h>
#include "lib/layer/iterate.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);
/**
* 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);
/**
* Search for a negative proof for sname+stype among validated NSECs.
*
* @param rrrs list of RRs to search; typically kr_request::auth_selected
* @param qry_uid only consider NSECs from this packet, for better efficiency
* @return negative error code, or PKT_NXDOMAIN | PKT_NODATA (both for NXDOMAIN)
*/
int kr_nsec_negative(const ranked_rr_array_t *rrrs, uint32_t qry_uid,
const knot_dname_t *sname, uint16_t stype);
/**
* Referral to unsigned subzone check (RFC4035 5.2).
*
* @param rrrs list of RRs to search; typically kr_request::auth_selected
* @param qry_uid only consider NSECs from this packet, for better efficiency
* @return 0 or negative error code, in particular DNSSEC_NOT_FOUND
*/
int kr_nsec_ref_to_unsigned(const ranked_rr_array_t *rrrs, uint32_t qry_uid,
const knot_dname_t *sname);
/**
* 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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