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/* Copyright (C) 2016-2017 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 <netinet/in.h>
#include <stdint.h>
#if defined(ENABLE_COOKIES)
#include <libknot/rrtype/opt.h>
#include <libknot/rrtype/opt-cookie.h>
#else
#define KNOT_OPT_COOKIE_CLNT 8
#define KNOT_OPT_COOKIE_SRVR_MAX 32
#endif /* defined(ENABLE_COOKIES) */
#include "lib/defines.h"
#include "lib/generic/lru.h"
/** Maximal size of a cookie option. */
#define KR_COOKIE_OPT_MAX_LEN (KNOT_EDNS_OPTION_HDRLEN + KNOT_OPT_COOKIE_CLNT + KNOT_OPT_COOKIE_SRVR_MAX)
/**
* Cookie option entry.
*/
struct cookie_opt_data {
uint8_t opt_data[KR_COOKIE_OPT_MAX_LEN];
};
/**
* DNS cookies tracking.
*/
typedef lru_t(struct cookie_opt_data) kr_cookie_lru_t;
/**
* @brief Obtain LRU cache entry.
*
* @param cache cookie LRU cache
* @param sa socket address serving as key
* @return pointer to cached option or NULL if not found or error occurred
*/
KR_EXPORT
const uint8_t *kr_cookie_lru_get(kr_cookie_lru_t *cache,
const struct sockaddr *sa);
/**
* @brief Stores cookie option into LRU cache.
*
* @param cache cookie LRU cache
* @param sa socket address serving as key
* @param opt cookie option to be stored
* @return kr_ok() or error code
*/
KR_EXPORT
int kr_cookie_lru_set(kr_cookie_lru_t *cache, const struct sockaddr *sa,
uint8_t *opt);
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