57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
/* Copyright (C) CZ.NIC, z.s.p.o. <knot-resolver@labs.nic.cz>
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* SPDX-License-Identifier: GPL-3.0-or-later
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*/
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#pragma once
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#include <netinet/in.h>
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#include <stdint.h>
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#if ENABLE_COOKIES
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#include <libknot/rrtype/opt.h>
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#include <libknot/rrtype/opt-cookie.h>
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#else
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#define KNOT_OPT_COOKIE_CLNT 8
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#define KNOT_OPT_COOKIE_SRVR_MAX 32
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#endif /* ENABLE_COOKIES */
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#include "lib/defines.h"
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#include "lib/generic/lru.h"
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/** Maximal size of a cookie option. */
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#define KR_COOKIE_OPT_MAX_LEN (KNOT_EDNS_OPTION_HDRLEN + KNOT_OPT_COOKIE_CLNT + KNOT_OPT_COOKIE_SRVR_MAX)
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/**
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* Cookie option entry.
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*/
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struct cookie_opt_data {
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uint8_t opt_data[KR_COOKIE_OPT_MAX_LEN];
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};
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/**
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* DNS cookies tracking.
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*/
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typedef lru_t(struct cookie_opt_data) kr_cookie_lru_t;
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/**
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* @brief Obtain LRU cache entry.
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*
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* @param cache cookie LRU cache
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* @param sa socket address serving as key
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* @return pointer to cached option or NULL if not found or error occurred
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*/
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KR_EXPORT
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const uint8_t *kr_cookie_lru_get(kr_cookie_lru_t *cache,
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const struct sockaddr *sa);
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/**
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* @brief Stores cookie option into LRU cache.
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*
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* @param cache cookie LRU cache
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* @param sa socket address serving as key
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* @param opt cookie option to be stored
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* @return kr_ok() or error code
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*/
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KR_EXPORT
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int kr_cookie_lru_set(kr_cookie_lru_t *cache, const struct sockaddr *sa,
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uint8_t *opt);
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