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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>
/**
* Name error response check (RFC5155 7.2.2).
* @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_nsec3_name_error_response_check(const knot_pkt_t *pkt, knot_section_t section_id,
const knot_dname_t *sname);
/**
* Wildcard answer response check (RFC5155 7.2.6).
* @param pkt Packet structure to be processed.
* @param section_id Packet section to be processed.
* @param sname Name to be checked.
* @param trim_to_next Number of labels to remove to obtain next closer name.
* @return 0 or error code:
* KNOT_ERANGE - NSEC3 RR that covers a wildcard
* has been found, but has opt-out flag set;
* otherwise - error.
*/
int kr_nsec3_wildcard_answer_response_check(const knot_pkt_t *pkt, knot_section_t section_id,
const knot_dname_t *sname, int trim_to_next);
/**
* Authenticated denial of existence according to RFC5155 8.5 and 8.7.
* @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:
* DNSSEC_NOT_FOUND - neither ds nor nsec records
* were not found.
* KNOT_ERANGE - denial of existence can't be proven
* due to opt-out, otherwise - bogus.
*/
int kr_nsec3_no_data(const knot_pkt_t *pkt, knot_section_t section_id,
const knot_dname_t *sname, uint16_t stype);
/**
* Referral to unsigned subzone check (RFC5155 8.9).
* @note No RRSIGs are validated.
* @param pkt Packet structure to be processed.
* @return 0 or error code:
* KNOT_ERANGE - denial of existence can't be proven
* due to opt-out.
* EEXIST - ds record was found.
* EINVAL - bogus.
*/
int kr_nsec3_ref_to_unsigned(const knot_pkt_t *pkt);
/**
* Checks whether supplied NSEC3 RR matches the supplied name and NS type.
* @param nsec3 NSEC3 RR.
* @param name Name to be checked.
* @param type Type to be checked. Only use with NS! TODO
* @return 0 or error code.
*/
int kr_nsec3_matches_name_and_type(const knot_rrset_t *nsec3,
const knot_dname_t *name, uint16_t type);
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