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/* Copyright (C) 2022 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 <sys/socket.h>
#include <sys/time.h>
#include "knot/nameserver/tsig_ctx.h"
#include "knot/query/layer.h"
#include "libknot/mm_ctx.h"
#include "libknot/rrtype/tsig.h"
typedef enum {
KNOT_REQUEST_NONE = 0, /*!< Empty flag. */
KNOT_REQUEST_UDP = 1 << 0, /*!< Use UDP for requests. */
KNOT_REQUEST_TFO = 1 << 1, /*!< Enable TCP Fast Open for requests. */
KNOT_REQUEST_KEEP = 1 << 2, /*!< Keep upstream TCP connection in pool for later reuse. */
} knot_request_flag_t;
typedef enum {
KNOT_REQUESTOR_CLOSE = 1 << 0, /*!< Close the connection indication. */
KNOT_REQUESTOR_REUSED = 1 << 1, /*!< Reused FD indication. */
} knot_requestor_flag_t;
/*! \brief Requestor structure.
*
* Requestor holds a FIFO of pending queries.
*/
typedef struct {
knot_mm_t *mm; /*!< Memory context. */
knot_layer_t layer; /*!< Response processing layer. */
} knot_requestor_t;
/*! \brief Request data (socket, payload, response, TSIG and endpoints). */
typedef struct {
int fd;
knot_request_flag_t flags;
struct sockaddr_storage remote, source;
knot_pkt_t *query;
knot_pkt_t *resp;
tsig_ctx_t tsig;
knot_sign_context_t sign; /*!< Required for async. DDNS processing. */
} knot_request_t;
/*!
* \brief Make request out of endpoints and query.
*
* \param mm Memory context.
* \param remote Remote endpoint address.
* \param source Source address (or NULL).
* \param query Query message.
* \param tsig_key TSIG key for authentication.
* \param flags Request flags.
*
* \return Prepared request or NULL in case of error.
*/
knot_request_t *knot_request_make(knot_mm_t *mm,
const struct sockaddr_storage *remote,
const struct sockaddr_storage *source,
knot_pkt_t *query,
const knot_tsig_key_t *tsig_key,
knot_request_flag_t flags);
/*!
* \brief Free request and associated data.
*
* \param request Freed request.
* \param mm Memory context.
*/
void knot_request_free(knot_request_t *request, knot_mm_t *mm);
/*!
* \brief Initialize requestor structure.
*
* \param requestor Requestor instance.
* \param proc Response processing module.
* \param proc_param Processing module context.
* \param mm Memory context.
*
* \return KNOT_EOK or error
*/
int knot_requestor_init(knot_requestor_t *requestor,
const knot_layer_api_t *proc, void *proc_param,
knot_mm_t *mm);
/*!
* \brief Clear the requestor structure and close pending queries.
*
* \param requestor Requestor instance.
*/
void knot_requestor_clear(knot_requestor_t *requestor);
/*!
* \brief Execute a request.
*
* \param requestor Requestor instance.
* \param request Request instance.
* \param timeout_ms Timeout of each operation in milliseconds (-1 for infinity).
*
* \return KNOT_EOK or error
*/
int knot_requestor_exec(knot_requestor_t *requestor,
knot_request_t *request,
int timeout_ms);
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