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217 lines
9 KiB
C
217 lines
9 KiB
C
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/**
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******************************************************************************
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* @file httpc.h
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* @author
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* @version
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* @brief This file provides user interface for HTTP/HTTPS client.
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******************************************************************************
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* @attention
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*
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* This module is a confidential and proprietary property of RealTek and possession or use of this module requires written permission of RealTek.
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*
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* Copyright(c) 2016, Realtek Semiconductor Corporation. All rights reserved.
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******************************************************************************
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*/
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#ifndef _HTTPC_H_
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#define _HTTPC_H_
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/** @addtogroup httpc HTTPC
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* @ingroup network
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* @brief HTTP/HTTPS client functions
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* @{
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*/
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#include "platform_stdlib.h"
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#include "platform_opts.h"
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#define HTTPC_SECURE_NONE 0 /*!< Running with HTTP client */
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#define HTTPC_SECURE_TLS 1 /*!< Running with HTTPS client */
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#define HTTPC_DEBUG_OFF 0 /*!< Disable httpc debug log */
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#define HTTPC_DEBUG_ON 1 /*!< Enable httpc debug log */
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#define HTTPC_DEBUG_VERBOSE 2 /*!< Enable httpc verbose debug log */
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#define HTTPC_TLS_POLARSSL 0 /*!< Use PolarSSL for TLS when HTTPS */
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#define HTTPC_TLS_MBEDTLS 1 /*!< Use mbedTLS for TLS when HTTPS */
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#if CONFIG_USE_POLARSSL
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#define HTTPC_USE_TLS HTTPC_TLS_POLARSSL
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#elif CONFIG_USE_MBEDTLS
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#define HTTPC_USE_TLS HTTPC_TLS_MBEDTLS
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#endif
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/**
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* @brief The structure is the context used for HTTP response header parsing.
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* @note Only header string includes string terminator.
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*/
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struct http_response {
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uint8_t *header; /*!< HTTP header string parsed in HTTP response */
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size_t header_len; /*!< HTTP header string length */
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uint8_t *version; /*!< Pointer to HTTP version in the parsed HTTP header string */
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size_t version_len; /*!< HTTP version data length */
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uint8_t *status; /*!< Pointer to HTTP status code in the parsed HTTP header string */
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size_t status_len; /*!< HTTP status code data length */
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uint8_t *content_type; /*!< Pointer to Content-Type header field in the parsed HTTP header string */
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size_t content_type_len; /*!< Content-Type header field data length */
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size_t content_len; /*!< Value of Content-Length header field parsed in HTTP header string */
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};
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/**
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* @brief The structure is the context used for connection.
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*/
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struct httpc_conn {
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int sock; /*!< Client socket descriptor for connection */
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struct http_response response; /*!< Context for HTTP response */
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void *tls; /*!< Context for TLS connection */
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uint8_t *request_header; /*!< Pointer to transmission buffer of HTTP request header */
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char *host; /*!< String of server host name or IP */
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uint16_t port; /*!< Service port */
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char *user_password; /*!< Base64 string for HTTP basic authorization */
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};
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/**
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* @brief This function is used to generate connection context for an HTTP/HTTPS client.
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* @param[in] secure: security mode for HTTP or HTTPS. Must be HTTPD_SECURE_NONE, HTTPD_SECURE_TLS.
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* @param[in] client_cert: string of client certificate if required to be verified by server.
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* @param[in] client_key: string of client private key if required to be verified by server.
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* @param[in] ca_certs: string including certificates in CA trusted chain if want to verify server certificate.
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* @return pointer to the generated connection context
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*/
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struct httpc_conn *httpc_conn_new(uint8_t secure, char *client_cert, char *client_key, char *ca_certs);
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/**
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* @brief This function is used to deallocate a connection context.
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* @param[in] conn: pointer to connection context
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* @return None
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*/
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void httpc_conn_free(struct httpc_conn *conn);
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/**
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* @brief This function is used to connect to a server.
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* @param[in] conn: pointer to connection context
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* @param[in] host: string of server host name or IP
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* @param[in] port: service port
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* @param[in] timeout: connection timeout in seconds
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* @return 0 : if successful
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* @return -1 : if error occurred
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*/
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int httpc_conn_connect(struct httpc_conn *conn, char *host, uint16_t port, uint32_t timeout);
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/**
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* @brief This function is used to close connection from a server.
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* @param[in] conn: pointer to connection context
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* @return None
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*/
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void httpc_conn_close(struct httpc_conn *conn);
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/**
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* @brief This function is used to setup authorization for connection.
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* @param[in] conn: pointer to connection context
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* @param[in] user: string of user name for authorization
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* @param[in] password: string of password for authorization
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* @return 0 : if successful
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* @return -1 : if error occurred
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* @note Must be used before httpc_conn_connect() if basic authorization is used
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*/
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int httpc_conn_setup_user_password(struct httpc_conn *conn, char *user, char *password);
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/**
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* @brief This function is used to setup httpc debug.
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* @param[in] debug: flag to enable/disable httpc debug. Must be HTTPC_DEBUG_OFF, HTTPC_DEBUG_ON, HTTPC_DEBUG_VERBOSE.
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* @return None
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*/
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void httpc_setup_debug(uint8_t debug);
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/**
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* @brief This function is used to free memory allocated by httpc API, such as httpc_response_get_header_field().
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* @param[in] ptr: pointer to memory to be deallocated
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* @return None
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*/
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void httpc_free(void *ptr);
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/**
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* @brief This function is used to dump the parsed HTTP header of response in connection context.
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* @param[in] conn: pointer to connection context
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* @return None
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*/
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void httpc_conn_dump_header(struct httpc_conn *conn);
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/**
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* @brief This function is used to start a HTTP request in connection.
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* @param[in] conn: pointer to connection context
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* @param[in] method: string of HTTP method in HTTP request
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* @param[in] resource: string including path and query string to identify a resource
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* @param[in] content_type: string of Content-Type header field written to HTTP request. No Content-Type in HTTP request if NULL.
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* @param[in] content_len: value of Content-Length header field written to HTTP request. No Content-Length in HTTP request if NULL.
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* @return 0 : if successful
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* @return -1 : if error occurred
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*/
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int httpc_request_write_header_start(struct httpc_conn *conn, char *method, char *resource, char *content_type, size_t content_len);
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/**
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* @brief This function is used to add an HTTP header field to HTTP request.
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* @param[in] conn: pointer to connection context
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* @param[in] name: HTTP header field name string
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* @param[in] value: HTTP header field value
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* @return 0 : if successful
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* @return -1 : if error occurred
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*/
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int httpc_request_write_header(struct httpc_conn *conn, char *name, char *value);
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/**
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* @brief This function is used to write HTTP request header data to connection.
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* @param[in] conn: pointer to connection context
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* @return return value of lwip socket write() for HTTP and PolarSSL ssl_write() for HTTPS
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*/
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int httpc_request_write_header_finish(struct httpc_conn *conn);
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/**
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* @brief This function is used to write HTTP request body data to connection.
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* @param[in] conn: pointer to connection context
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* @param[in] data: data to be written
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* @param[in] data_len: data length
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* @return return value of lwip socket write() for HTTP and PolarSSL ssl_write() for HTTPS
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*/
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int httpc_request_write_data(struct httpc_conn *conn, uint8_t *data, size_t data_len);
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/**
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* @brief This function is used to check HTTP status of response in connection context.
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* @param[in] conn: pointer to connection context
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* @param[in] status: HTTP status string to compare with
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* @return 0 : if different
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* @return 1 : if matched
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*/
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int httpc_response_is_status(struct httpc_conn *conn, char *status);
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/**
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* @brief This function is used to read HTTP header from client socket descriptor and parse content to connection context.
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* @param[in] conn: pointer to connection context
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* @return 0 : if successful
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* @return -1 : if error occurred
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*/
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int httpc_response_read_header(struct httpc_conn *conn);
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/**
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* @brief This function is used to read data from HTTP/HTTPS connection.
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* @param[in] conn: pointer to connection context
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* @param[out] data: buffer for data read
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* @param[in] data_len: buffer length
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* @return return value of lwip socket read() for HTTP and PolarSSL ssl_read() for HTTPS
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*/
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int httpc_response_read_data(struct httpc_conn *conn, uint8_t *data, size_t data_len);
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/**
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* @brief This function is used to get a header field from HTTP header of connection context.
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* @param[in] conn: pointer to connection context
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* @param[in] field: header field string to search
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* @param[out] value: search result stored in memory allocated
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* @return 0 : if found
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* @return -1 : if not found
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* @note The search result memory should be free by httpc_free().
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*/
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int httpc_response_get_header_field(struct httpc_conn *conn, char *field, char **value);
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/*\@}*/
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#endif /* _HTTPC_H_ */
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