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/* Copyright (C) 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 <http://www.gnu.org/licenses/>.
*/
/*!
* \file
*
* \brief DNS cookies processing.
*
* \addtogroup libknot
* @{
*/
#pragma once
#include <stdint.h>
#include <sys/socket.h>
#include "libknot/rrtype/opt.h"
#define KNOT_EDNS_COOKIE_SECRET_SIZE 16
/*!
* \brief DNS Cookie parameters needed to compute the cookie value.
*
* \note Server address is not used for the server cookie check.
*/
typedef struct {
const struct sockaddr *client_addr; /*!< Client socket address. */
const struct sockaddr *server_addr; /*!< Server socket address. */
uint8_t secret[KNOT_EDNS_COOKIE_SECRET_SIZE]; /*!< Cookie secret data. */
} knot_edns_cookie_params_t;
/*!
* \brief Generate a client cookie using given parameters.
*
* \param out Generated client cookie.
* \param params Client cookie parameters.
*
* \retval KNOT_EOK
* \retval KNOT_EINVAL
*/
int knot_edns_cookie_client_generate(knot_edns_cookie_t *out,
const knot_edns_cookie_params_t *params);
/*!
* \brief Check whether client cookie was generated using given parameters.
*
* \param cc Client cookie that should be checked.
* \param params Client cookie parameters.
*
* \retval KNOT_EOK
* \retval KNOT_EINVAL
*/
int knot_edns_cookie_client_check(const knot_edns_cookie_t *cc,
const knot_edns_cookie_params_t *params);
/*!
* \brief Generate a server cookie using given parameters.
*
* \param out Generated server cookie.
* \param cc Client cookie parameter.
* \param params Server cookie parameters.
*
* \retval KNOT_EOK
* \retval KNOT_EINVAL
*/
int knot_edns_cookie_server_generate(knot_edns_cookie_t *out,
const knot_edns_cookie_t *cc,
const knot_edns_cookie_params_t *params);
/*!
* \brief Check whether server cookie was generated using given parameters.
*
* \param sc Server cookie that should be checked.
* \param cc Client cookie parameter.
* \param params Server cookie parameters.
*
* \retval KNOT_EOK
* \retval KNOT_EINVAL
*/
int knot_edns_cookie_server_check(const knot_edns_cookie_t *sc,
const knot_edns_cookie_t *cc,
const knot_edns_cookie_params_t *params);
/*! @} */
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