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diff --git a/lib/cookies/control.h b/lib/cookies/control.h
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+/* Copyright (C) 2016-2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "lib/defines.h"
+
+/** Holds secret quantity. */
+struct kr_cookie_secret {
+ size_t size; /*!< Secret quantity size. */
+ uint8_t data[]; /*!< Secret quantity data. */
+};
+
+/** Holds settings that have direct influence on cookie values computation. */
+struct kr_cookie_comp {
+ struct kr_cookie_secret *secr; /*!< Secret data. */
+ int alg_id; /*!< Cookie algorithm identifier. */
+};
+
+/** Holds settings that control client/server cookie behaviour. */
+struct kr_cookie_settings {
+ bool enabled; /**< Enable/disables DNS cookies functionality. */
+
+ struct kr_cookie_comp current; /**< Current cookie settings. */
+ struct kr_cookie_comp recent; /**< Recent cookie settings. */
+};
+
+/** DNS cookies controlling structure. */
+struct kr_cookie_ctx {
+ struct kr_cookie_settings clnt; /**< Client settings. */
+ struct kr_cookie_settings srvr; /**< Server settings. */
+};