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/** @file
* @brief Websocket API
*
* An API for applications to setup websocket connections
*/
/*
* Copyright (c) 2019 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef ZEPHYR_INCLUDE_NET_WEBSOCKET_H_
#define ZEPHYR_INCLUDE_NET_WEBSOCKET_H_
#include <kernel.h>
#include <net/net_ip.h>
#include <net/http_parser.h>
#include <net/http_client.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Websocket API
* @defgroup websocket Websocket API
* @ingroup networking
* @{
*/
/** Message type values. Returned in websocket_recv_msg() */
#define WEBSOCKET_FLAG_FINAL 0x00000001 /**< Final frame */
#define WEBSOCKET_FLAG_TEXT 0x00000002 /**< Textual data */
#define WEBSOCKET_FLAG_BINARY 0x00000004 /**< Binary data */
#define WEBSOCKET_FLAG_CLOSE 0x00000008 /**< Closing connection */
#define WEBSOCKET_FLAG_PING 0x00000010 /**< Ping message */
#define WEBSOCKET_FLAG_PONG 0x00000011 /**< Pong message */
enum websocket_opcode {
WEBSOCKET_OPCODE_CONTINUE = 0x00,
WEBSOCKET_OPCODE_DATA_TEXT = 0x01,
WEBSOCKET_OPCODE_DATA_BINARY = 0x02,
WEBSOCKET_OPCODE_CLOSE = 0x08,
WEBSOCKET_OPCODE_PING = 0x09,
WEBSOCKET_OPCODE_PONG = 0x0A,
};
/**
* @typedef websocket_connect_cb_t
* @brief Callback called after Websocket connection is established.
*
* @param sock Websocket id
* @param req HTTP handshake request
* @param user_data A valid pointer on some user data or NULL
*
* @return 0 if ok, <0 if there is an error and connection should be aborted
*/
typedef int (*websocket_connect_cb_t)(int ws_sock, struct http_request *req,
void *user_data);
/**
* Websocket client connection request. This contains all the data that is
* needed when doing a Websocket connection request.
*/
struct websocket_request {
/** Host of the Websocket server when doing HTTP handshakes. */
const char *host;
/** URL of the Websocket. */
const char *url;
/** User supplied callback function to call when optional headers need
* to be sent. This can be NULL, in which case the optional_headers
* field in http_request is used. The idea of this optional_headers
* callback is to allow user to send more HTTP header data that is
* practical to store in allocated memory.
*/
http_header_cb_t optional_headers_cb;
/** A NULL terminated list of any optional headers that
* should be added to the HTTP request. May be NULL.
* If the optional_headers_cb is specified, then this field is ignored.
*/
const char **optional_headers;
/** User supplied callback function to call when a connection is
* established.
*/
websocket_connect_cb_t cb;
/** User supplied list of callback functions if the calling application
* wants to know the parsing status or the HTTP fields during the
* handshake. This is optional parameter and normally not needed but
* is useful if the caller wants to know something about
* the fields that the server is sending.
*/
const struct http_parser_settings *http_cb;
/** User supplied buffer where HTTP connection data is stored */
u8_t *tmp_buf;
/** Length of the user supplied temp buffer */
size_t tmp_buf_len;
};
/**
* @brief Connect to a server that provides Websocket service. The callback is
* called after connection is established. The returned value is a new socket
* descriptor that can be used to send / receive data using the BSD socket API.
*
* @param http_sock Socket id to the server. Note that this socket is used to do
* HTTP handshakes etc. The actual Websocket connectivity is done via the
* returned websocket id. Note that the http_sock must not be closed
* after this function returns as it is used to deliver the Websocket
* packets to the Websocket server.
* @param req Websocket request. User should allocate and fill the request
* data.
* @param timeout Max timeout to wait for the connection. The timeout value
* cannot be 0 as there would be no time to receive the data.
* @param user_data User specified data that is passed to the callback.
*
* @return Websocket id to be used when sending/receiving Websocket data.
*/
int websocket_connect(int http_sock, struct websocket_request *req,
s32_t timeout, void *user_data);
/**
* @brief Send websocket msg to peer.
*
* @details The function will automatically add websocket header to the
* message.
*
* @param ws_sock Websocket id returned by websocket_connect().
* @param payload Websocket data to send.
* @param payload_len Length of the data to be sent.
* @param opcode Operation code (text, binary, ping, pong, close)
* @param mask Mask the data, see RFC 6455 for details
* @param final Is this final message for this message send. If final == false,
* then the first message must have valid opcode and subsequent messages
* must have opcode WEBSOCKET_OPCODE_CONTINUE. If final == true and this
* is the only message, then opcode should have proper opcode (text or
* binary) set.
* @param timeout How long to try to send the message.
*
* @return <0 if error, >=0 amount of bytes sent
*/
int websocket_send_msg(int ws_sock, const u8_t *payload, size_t payload_len,
enum websocket_opcode opcode, bool mask, bool final,
s32_t timeout);
/**
* @brief Receive websocket msg from peer.
*
* @details The function will automatically remove websocket header from the
* message.
*
* @param ws_sock Websocket id returned by websocket_connect().
* @param buf Buffer where websocket data is read.
* @param buf_len Length of the data buffer.
* @param message_type Type of the message.
* @param remaining How much there is data left in the message after this read.
* @param timeout How long to try to receive the message.
*
* @return <0 if error, >=0 amount of bytes received
*/
int websocket_recv_msg(int ws_sock, u8_t *buf, size_t buf_len,
u32_t *message_type, u64_t *remaining, s32_t timeout);
/**
* @brief Close websocket.
*
* @details One must call websocket_connect() after this call to re-establish
* the connection.
*
* @param ws_sock Websocket id returned by websocket_connect().
*/
int websocket_disconnect(int ws_sock);
#if defined(CONFIG_WEBSOCKET_CLIENT)
void websocket_init(void);
#else
static inline void websocket_init(void)
{
}
#endif
#ifdef __cplusplus
}
#endif
/**
* @}
*/
#endif /* ZEPHYR_INCLUDE_NET_WEBSOCKET_H_ */