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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 <stdbool.h>
/*! \brief HTTP method to transfer query. */
typedef enum {
POST,
GET
} https_method_t;
/*! \brief HTTPS parameters. */
typedef struct {
/*! Use HTTPS indicator. */
bool enable;
/*! HTTP method to transfer query. */
https_method_t method;
/*! Path */
char *path;
} https_params_t;
int https_params_copy(https_params_t *dst, const https_params_t *src);
void https_params_clean(https_params_t *params);
#ifdef LIBNGHTTP2
#include <netinet/in.h>
#include <pthread.h>
#include <sys/socket.h>
#include <nghttp2/nghttp2.h>
#include "utils/common/tls.h"
extern const gnutls_datum_t doh_alpn;
/*! \brief Structure that stores data source for DATA frames. */
typedef struct {
const uint8_t *buf;
size_t buf_len;
} https_data_provider_t;
/*! \brief HTTPS context. */
typedef struct {
// Parameters
https_params_t params;
// Contexts
nghttp2_session *session;
tls_ctx_t *tls;
char *authority;
char *path;
// Send destination
const uint8_t *send_buf;
size_t send_buflen;
// Recv destination
uint8_t *recv_buf;
size_t recv_buflen;
unsigned long status;
// Recv locks
pthread_mutex_t recv_mx;
int32_t stream;
} https_ctx_t;
/*!
* \brief Initialize HTTPS context.
*
* \param ctx HTTPS context.
* \param tls_ctx TLS context.
* \param params Parameter table.
*
* \retval KNOT_EOK When initialized.
* \retval KNOT_EINVAL When parameters are invalid.
*/
int https_ctx_init(https_ctx_t *ctx, tls_ctx_t *tls_ctx, const https_params_t *params);
/*!
* \brief Create TLS connection and perform HTTPS handshake.
*
* \param ctx HTTPS context.
* \param sockfd Socket descriptor.
* \param fastopen Use TCP Fast Open indication.
* \param addr Socket address storage with address to server side.
*
* \retval KNOT_EOK When successfully connected.
* \retval KNOT_EINVAL When parameters are invalid.
* \retval KNOT_NET_ESOCKET When socket is no accessible.
* \retval KNOT_NET_ETIMEOUT When server respond takes too long.
* \retval KNOT_NET_ECONNECT When unnable to connect to the server.
*/
int https_ctx_connect(https_ctx_t *ctx, int sockfd, bool fastopen,
struct sockaddr_storage *addr);
/*!
* \brief Send buffer as DNS message over HTTPS.
*
* \param ctx HTTPS context.
* \param buf Buffer with DNS message in wire format.
* \param buf_len Length of buffer.
*
* \retval KNOT_EOK When successfully sent.
* \retval KNOT_EINVAL When parameters are invalid.
* \retval KNOT_NET_ESEND When error occurs while sending a data.
*/
int https_send_dns_query(https_ctx_t *ctx, const uint8_t *buf, const size_t buf_len);
/*!
* \brief Receive DATA frame as HTTPS packet, and store it into buffer.
*
* \param ctx HTTPS context.
* \param buf Buffer where will be DNS response stored.
* \param buf_len Length of buffer.
*
* \retval >=0 Number of bytes received in DATA frame.
* \retval KNOT_NET_ERECV When error while receive.
*/
int https_recv_dns_response(https_ctx_t *ctx, uint8_t *buf, const size_t buf_len);
/*!
* \brief Deinitialize HTTPS context.
*
* \param ctx HTTPS context.
*/
void https_ctx_deinit(https_ctx_t *ctx);
/*!
* \brief Prints information about HTTPS context.
*
* \param ctx HTTPS context.
*/
void print_https(const https_ctx_t *ctx);
#endif //LIBNGHTTP2
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