/* * SPDX-FileCopyrightText: 2018-2021 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 */ #ifndef _ESP_HTTP_SERVER_H_ #define _ESP_HTTP_SERVER_H_ #include #include #include #include #include #include #include #include #include #ifdef __cplusplus extern "C" { #endif #define ESP_HTTPD_DEF_CTRL_PORT (32768) /*!< HTTP Server control socket port*/ ESP_EVENT_DECLARE_BASE(ESP_HTTP_SERVER_EVENT); /** * @brief HTTP Server events id */ typedef enum { HTTP_SERVER_EVENT_ERROR = 0, /*!< This event occurs when there are any errors during execution */ HTTP_SERVER_EVENT_START, /*!< This event occurs when HTTP Server is started */ HTTP_SERVER_EVENT_ON_CONNECTED, /*!< Once the HTTP Server has been connected to the client, no data exchange has been performed */ HTTP_SERVER_EVENT_ON_HEADER, /*!< Occurs when receiving each header sent from the client */ HTTP_SERVER_EVENT_HEADERS_SENT, /*!< After sending all the headers to the client */ HTTP_SERVER_EVENT_ON_DATA, /*!< Occurs when receiving data from the client */ HTTP_SERVER_EVENT_SENT_DATA, /*!< Occurs when an ESP HTTP server session is finished */ HTTP_SERVER_EVENT_DISCONNECTED, /*!< The connection has been disconnected */ HTTP_SERVER_EVENT_STOP, /*!< This event occurs when HTTP Server is stopped */ } esp_http_server_event_id_t; /** Argument structure for HTTP_SERVER_EVENT_ON_DATA and HTTP_SERVER_EVENT_SENT_DATA event */ typedef struct { int fd; /*!< Session socket file descriptor */ int data_len; /*!< Data length */ } esp_http_server_event_data; /* note: esp_https_server.h includes a customized copy of this initializer that should be kept in sync */ #define HTTPD_DEFAULT_CONFIG() { \ .task_priority = tskIDLE_PRIORITY+5, \ .stack_size = 4096, \ .core_id = tskNO_AFFINITY, \ .task_caps = (MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT), \ .server_port = 80, \ .ctrl_port = ESP_HTTPD_DEF_CTRL_PORT, \ .max_open_sockets = 7, \ .max_uri_handlers = 8, \ .max_resp_headers = 8, \ .backlog_conn = 5, \ .lru_purge_enable = false, \ .recv_wait_timeout = 5, \ .send_wait_timeout = 5, \ .global_user_ctx = NULL, \ .global_user_ctx_free_fn = NULL, \ .global_transport_ctx = NULL, \ .global_transport_ctx_free_fn = NULL, \ .enable_so_linger = false, \ .linger_timeout = 0, \ .keep_alive_enable = false, \ .keep_alive_idle = 0, \ .keep_alive_interval = 0, \ .keep_alive_count = 0, \ .open_fn = NULL, \ .close_fn = NULL, \ .uri_match_fn = NULL \ } #define ESP_ERR_HTTPD_BASE (0xb000) /*!< Starting number of HTTPD error codes */ #define ESP_ERR_HTTPD_HANDLERS_FULL (ESP_ERR_HTTPD_BASE + 1) /*!< All slots for registering URI handlers have been consumed */ #define ESP_ERR_HTTPD_HANDLER_EXISTS (ESP_ERR_HTTPD_BASE + 2) /*!< URI handler with same method and target URI already registered */ #define ESP_ERR_HTTPD_INVALID_REQ (ESP_ERR_HTTPD_BASE + 3) /*!< Invalid request pointer */ #define ESP_ERR_HTTPD_RESULT_TRUNC (ESP_ERR_HTTPD_BASE + 4) /*!< Result string truncated */ #define ESP_ERR_HTTPD_RESP_HDR (ESP_ERR_HTTPD_BASE + 5) /*!< Response header field larger than supported */ #define ESP_ERR_HTTPD_RESP_SEND (ESP_ERR_HTTPD_BASE + 6) /*!< Error occured while sending response packet */ #define ESP_ERR_HTTPD_ALLOC_MEM (ESP_ERR_HTTPD_BASE + 7) /*!< Failed to dynamically allocate memory for resource */ #define ESP_ERR_HTTPD_TASK (ESP_ERR_HTTPD_BASE + 8) /*!< Failed to launch server task/thread */ /* Symbol to be used as length parameter in httpd_resp_send APIs * for setting buffer length to string length */ #define HTTPD_RESP_USE_STRLEN -1 /* ************** Group: Initialization ************** */ /** @name Initialization * APIs related to the Initialization of the web server * @{ */ /** * @brief HTTP Server Instance Handle * * Every instance of the server will have a unique handle. */ typedef void* httpd_handle_t; /** * @brief HTTP Method Type wrapper over "enum http_method" * available in "http_parser" library */ typedef enum http_method httpd_method_t; #define HTTP_ANY INT_MAX /** * @brief Prototype for freeing context data (if any) * @param[in] ctx object to free */ typedef void (*httpd_free_ctx_fn_t)(void *ctx); /** * @brief Function prototype for opening a session. * * Called immediately after the socket was opened to set up the send/recv functions and * other parameters of the socket. * * @param[in] hd server instance * @param[in] sockfd session socket file descriptor * @return * - ESP_OK : On success * - Any value other than ESP_OK will signal the server to close the socket immediately */ typedef esp_err_t (*httpd_open_func_t)(httpd_handle_t hd, int sockfd); /** * @brief Function prototype for closing a session. * * @note It's possible that the socket descriptor is invalid at this point, the function * is called for all terminated sessions. Ensure proper handling of return codes. * * @param[in] hd server instance * @param[in] sockfd session socket file descriptor */ typedef void (*httpd_close_func_t)(httpd_handle_t hd, int sockfd); /** * @brief Function prototype for URI matching. * * @param[in] reference_uri URI/template with respect to which the other URI is matched * @param[in] uri_to_match URI/template being matched to the reference URI/template * @param[in] match_upto For specifying the actual length of `uri_to_match` up to * which the matching algorithm is to be applied (The maximum * value is `strlen(uri_to_match)`, independent of the length * of `reference_uri`) * @return true on match */ typedef bool (*httpd_uri_match_func_t)(const char *reference_uri, const char *uri_to_match, size_t match_upto); /** * @brief HTTP Server Configuration Structure * * @note Use HTTPD_DEFAULT_CONFIG() to initialize the configuration * to a default value and then modify only those fields that are * specifically determined by the use case. */ typedef struct httpd_config { unsigned task_priority; /*!< Priority of FreeRTOS task which runs the server */ size_t stack_size; /*!< The maximum stack size allowed for the server task */ BaseType_t core_id; /*!< The core the HTTP server task will run on */ uint32_t task_caps; /*!< The memory capabilities to use when allocating the HTTP server task's stack */ /** * TCP Port number for receiving and transmitting HTTP traffic */ uint16_t server_port; /** * UDP Port number for asynchronously exchanging control signals * between various components of the server */ uint16_t ctrl_port; uint16_t max_open_sockets; /*!< Max number of sockets/clients connected at any time (3 sockets are reserved for internal working of the HTTP server) */ uint16_t max_uri_handlers; /*!< Maximum allowed uri handlers */ uint16_t max_resp_headers; /*!< Maximum allowed additional headers in HTTP response */ uint16_t backlog_conn; /*!< Number of backlog connections */ bool lru_purge_enable; /*!< Purge "Least Recently Used" connection */ uint16_t recv_wait_timeout; /*!< Timeout for recv function (in seconds)*/ uint16_t send_wait_timeout; /*!< Timeout for send function (in seconds)*/ /** * Global user context. * * This field can be used to store arbitrary user data within the server context. * The value can be retrieved using the server handle, available e.g. in the httpd_req_t struct. * * When shutting down, the server frees up the user context by * calling free() on the global_user_ctx field. If you wish to use a custom * function for freeing the global user context, please specify that here. */ void * global_user_ctx; /** * Free function for global user context */ httpd_free_ctx_fn_t global_user_ctx_free_fn; /** * Global transport context. * * Similar to global_user_ctx, but used for session encoding or encryption (e.g. to hold the SSL context). * It will be freed using free(), unless global_transport_ctx_free_fn is specified. */ void * global_transport_ctx; /** * Free function for global transport context */ httpd_free_ctx_fn_t global_transport_ctx_free_fn; bool enable_so_linger; /*!< bool to enable/disable linger */ int linger_timeout; /*!< linger timeout (in seconds) */ bool keep_alive_enable; /*!< Enable keep-alive timeout */ int keep_alive_idle; /*!< Keep-alive idle time. Default is 5 (second) */ int keep_alive_interval;/*!< Keep-alive interval time. Default is 5 (second) */ int keep_alive_count; /*!< Keep-alive packet retry send count. Default is 3 counts */ /** * Custom session opening callback. * * Called on a new session socket just after accept(), but before reading any data. * * This is an opportunity to set up e.g. SSL encryption using global_transport_ctx * and the send/recv/pending session overrides. * * If a context needs to be maintained between these functions, store it in the session using * httpd_sess_set_transport_ctx() and retrieve it later with httpd_sess_get_transport_ctx() * * Returning a value other than ESP_OK will immediately close the new socket. */ httpd_open_func_t open_fn; /** * Custom session closing callback. * * Called when a session is deleted, before freeing user and transport contexts and before * closing the socket. This is a place for custom de-init code common to all sockets. * * The server will only close the socket if no custom session closing callback is set. * If a custom callback is used, `close(sockfd)` should be called in here for most cases. * * Set the user or transport context to NULL if it was freed here, so the server does not * try to free it again. * * This function is run for all terminated sessions, including sessions where the socket * was closed by the network stack - that is, the file descriptor may not be valid anymore. */ httpd_close_func_t close_fn; /** * URI matcher function. * * Called when searching for a matching URI: * 1) whose request handler is to be executed right * after an HTTP request is successfully parsed * 2) in order to prevent duplication while registering * a new URI handler using `httpd_register_uri_handler()` * * Available options are: * 1) NULL : Internally do basic matching using `strncmp()` * 2) `httpd_uri_match_wildcard()` : URI wildcard matcher * * Users can implement their own matching functions (See description * of the `httpd_uri_match_func_t` function prototype) */ httpd_uri_match_func_t uri_match_fn; } httpd_config_t; /** * @brief Starts the web server * * Create an instance of HTTP server and allocate memory/resources for it * depending upon the specified configuration. * * Example usage: * @code{c} * * //Function for starting the webserver * httpd_handle_t start_webserver(void) * { * // Generate default configuration * httpd_config_t config = HTTPD_DEFAULT_CONFIG(); * * // Empty handle to http_server * httpd_handle_t server = NULL; * * // Start the httpd server * if (httpd_start(&server, &config) == ESP_OK) { * // Register URI handlers * httpd_register_uri_handler(server, &uri_get); * httpd_register_uri_handler(server, &uri_post); * } * // If server failed to start, handle will be NULL * return server; * } * * @endcode * * @param[in] config Configuration for new instance of the server * @param[out] handle Handle to newly created instance of the server. NULL on error * @return * - ESP_OK : Instance created successfully * - ESP_ERR_INVALID_ARG : Null argument(s) * - ESP_ERR_HTTPD_ALLOC_MEM : Failed to allocate memory for instance * - ESP_ERR_HTTPD_TASK : Failed to launch server task */ esp_err_t httpd_start(httpd_handle_t *handle, const httpd_config_t *config); /** * @brief Stops the web server * * Deallocates memory/resources used by an HTTP server instance and * deletes it. Once deleted the handle can no longer be used for accessing * the instance. * * Example usage: * @code{c} * * // Function for stopping the webserver * void stop_webserver(httpd_handle_t server) * { * // Ensure handle is non NULL * if (server != NULL) { * // Stop the httpd server * httpd_stop(server); * } * } * * @endcode * * @param[in] handle Handle to server returned by httpd_start * @return * - ESP_OK : Server stopped successfully * - ESP_ERR_INVALID_ARG : Handle argument is Null */ esp_err_t httpd_stop(httpd_handle_t handle); /** End of Group Initialization * @} */ /* ************** Group: URI Handlers ************** */ /** @name URI Handlers * APIs related to the URI handlers * @{ */ /* Max supported HTTP request header length */ #define HTTPD_MAX_REQ_HDR_LEN CONFIG_HTTPD_MAX_REQ_HDR_LEN /* Max supported HTTP request URI length */ #define HTTPD_MAX_URI_LEN CONFIG_HTTPD_MAX_URI_LEN /** * @brief HTTP Request Data Structure */ typedef struct httpd_req { httpd_handle_t handle; /*!< Handle to server instance */ int method; /*!< The type of HTTP request, -1 if unsupported method, HTTP_ANY for wildcard method to support every method */ const char uri[HTTPD_MAX_URI_LEN + 1]; /*!< The URI of this request (1 byte extra for null termination) */ size_t content_len; /*!< Length of the request body */ void *aux; /*!< Internally used members */ /** * User context pointer passed during URI registration. */ void *user_ctx; /** * Session Context Pointer * * A session context. Contexts are maintained across 'sessions' for a * given open TCP connection. One session could have multiple request * responses. The web server will ensure that the context persists * across all these request and responses. * * By default, this is NULL. URI Handlers can set this to any meaningful * value. * * If the underlying socket gets closed, and this pointer is non-NULL, * the web server will free up the context by calling free(), unless * free_ctx function is set. */ void *sess_ctx; /** * Pointer to free context hook * * Function to free session context * * If the web server's socket closes, it frees up the session context by * calling free() on the sess_ctx member. If you wish to use a custom * function for freeing the session context, please specify that here. */ httpd_free_ctx_fn_t free_ctx; /** * Flag indicating if Session Context changes should be ignored * * By default, if you change the sess_ctx in some URI handler, the http server * will internally free the earlier context (if non NULL), after the URI handler * returns. If you want to manage the allocation/reallocation/freeing of * sess_ctx yourself, set this flag to true, so that the server will not * perform any checks on it. The context will be cleared by the server * (by calling free_ctx or free()) only if the socket gets closed. */ bool ignore_sess_ctx_changes; } httpd_req_t; /** * @brief Structure for URI handler */ typedef struct httpd_uri { const char *uri; /*!< The URI to handle */ httpd_method_t method; /*!< Method supported by the URI, HTTP_ANY for wildcard method to support all methods*/ /** * Handler to call for supported request method. This must * return ESP_OK, or else the underlying socket will be closed. */ esp_err_t (*handler)(httpd_req_t *r); /** * Pointer to user context data which will be available to handler */ void *user_ctx; #ifdef CONFIG_HTTPD_WS_SUPPORT /** * Flag for indicating a WebSocket endpoint. * If this flag is true, then method must be HTTP_GET. Otherwise the handshake will not be handled. */ bool is_websocket; /** * Flag indicating that control frames (PING, PONG, CLOSE) are also passed to the handler * This is used if a custom processing of the control frames is needed */ bool handle_ws_control_frames; /** * Pointer to subprotocol supported by URI */ const char *supported_subprotocol; #endif } httpd_uri_t; /** * @brief Registers a URI handler * * @note URI handlers can be registered in real time as long as the * server handle is valid. * * Example usage: * @code{c} * * esp_err_t my_uri_handler(httpd_req_t* req) * { * // Recv , Process and Send * .... * .... * .... * * // Fail condition * if (....) { * // Return fail to close session // * return ESP_FAIL; * } * * // On success * return ESP_OK; * } * * // URI handler structure * httpd_uri_t my_uri { * .uri = "/my_uri/path/xyz", * .method = HTTPD_GET, * .handler = my_uri_handler, * .user_ctx = NULL * }; * * // Register handler * if (httpd_register_uri_handler(server_handle, &my_uri) != ESP_OK) { * // If failed to register handler * .... * } * * @endcode * * @param[in] handle handle to HTTPD server instance * @param[in] uri_handler pointer to handler that needs to be registered * * @return * - ESP_OK : On successfully registering the handler * - ESP_ERR_INVALID_ARG : Null arguments * - ESP_ERR_HTTPD_HANDLERS_FULL : If no slots left for new handler * - ESP_ERR_HTTPD_HANDLER_EXISTS : If handler with same URI and * method is already registered */ esp_err_t httpd_register_uri_handler(httpd_handle_t handle, const httpd_uri_t *uri_handler); /** * @brief Unregister a URI handler * * @param[in] handle handle to HTTPD server instance * @param[in] uri URI string * @param[in] method HTTP method * * @return * - ESP_OK : On successfully deregistering the handler * - ESP_ERR_INVALID_ARG : Null arguments * - ESP_ERR_NOT_FOUND : Handler with specified URI and method not found */ esp_err_t httpd_unregister_uri_handler(httpd_handle_t handle, const char *uri, httpd_method_t method); /** * @brief Unregister all URI handlers with the specified uri string * * @param[in] handle handle to HTTPD server instance * @param[in] uri uri string specifying all handlers that need * to be deregisterd * * @return * - ESP_OK : On successfully deregistering all such handlers * - ESP_ERR_INVALID_ARG : Null arguments * - ESP_ERR_NOT_FOUND : No handler registered with specified uri string */ esp_err_t httpd_unregister_uri(httpd_handle_t handle, const char* uri); /** End of URI Handlers * @} */ /* ************** Group: HTTP Error ************** */ /** @name HTTP Error * Prototype for HTTP errors and error handling functions * @{ */ /** * @brief Error codes sent as HTTP response in case of errors * encountered during processing of an HTTP request */ typedef enum { /* For any unexpected errors during parsing, like unexpected * state transitions, or unhandled errors. */ HTTPD_500_INTERNAL_SERVER_ERROR = 0, /* For methods not supported by http_parser. Presently * http_parser halts parsing when such methods are * encountered and so the server responds with 400 Bad * Request error instead. */ HTTPD_501_METHOD_NOT_IMPLEMENTED, /* When HTTP version is not 1.1 */ HTTPD_505_VERSION_NOT_SUPPORTED, /* Returned when http_parser halts parsing due to incorrect * syntax of request, unsupported method in request URI or * due to chunked encoding / upgrade field present in headers */ HTTPD_400_BAD_REQUEST, /* This response means the client must authenticate itself * to get the requested response. */ HTTPD_401_UNAUTHORIZED, /* The client does not have access rights to the content, * so the server is refusing to give the requested resource. * Unlike 401, the client's identity is known to the server. */ HTTPD_403_FORBIDDEN, /* When requested URI is not found */ HTTPD_404_NOT_FOUND, /* When URI found, but method has no handler registered */ HTTPD_405_METHOD_NOT_ALLOWED, /* Intended for recv timeout. Presently it's being sent * for other recv errors as well. Client should expect the * server to immediately close the connection after * responding with this. */ HTTPD_408_REQ_TIMEOUT, /* Intended for responding to chunked encoding, which is * not supported currently. Though unhandled http_parser * callback for chunked request returns "400 Bad Request" */ HTTPD_411_LENGTH_REQUIRED, /* URI length greater than CONFIG_HTTPD_MAX_URI_LEN */ HTTPD_414_URI_TOO_LONG, /* Headers section larger than CONFIG_HTTPD_MAX_REQ_HDR_LEN */ HTTPD_431_REQ_HDR_FIELDS_TOO_LARGE, /* Used internally for retrieving the total count of errors */ HTTPD_ERR_CODE_MAX } httpd_err_code_t; /** * @brief Function prototype for HTTP error handling. * * This function is executed upon HTTP errors generated during * internal processing of an HTTP request. This is used to override * the default behavior on error, which is to send HTTP error response * and close the underlying socket. * * @note * - If implemented, the server will not automatically send out HTTP * error response codes, therefore, httpd_resp_send_err() must be * invoked inside this function if user wishes to generate HTTP * error responses. * - When invoked, the validity of `uri`, `method`, `content_len` * and `user_ctx` fields of the httpd_req_t parameter is not * guaranteed as the HTTP request may be partially received/parsed. * - The function must return ESP_OK if underlying socket needs to * be kept open. Any other value will ensure that the socket is * closed. The return value is ignored when error is of type * `HTTPD_500_INTERNAL_SERVER_ERROR` and the socket closed anyway. * * @param[in] req HTTP request for which the error needs to be handled * @param[in] error Error type * * @return * - ESP_OK : error handled successful * - ESP_FAIL : failure indicates that the underlying socket needs to be closed */ typedef esp_err_t (*httpd_err_handler_func_t)(httpd_req_t *req, httpd_err_code_t error); /** * @brief Function for registering HTTP error handlers * * This function maps a handler function to any supported error code * given by `httpd_err_code_t`. See prototype `httpd_err_handler_func_t` * above for details. * * @param[in] handle HTTP server handle * @param[in] error Error type * @param[in] handler_fn User implemented handler function * (Pass NULL to unset any previously set handler) * * @return * - ESP_OK : handler registered successfully * - ESP_ERR_INVALID_ARG : invalid error code or server handle */ esp_err_t httpd_register_err_handler(httpd_handle_t handle, httpd_err_code_t error, httpd_err_handler_func_t handler_fn); /** End of HTTP Error * @} */ /* ************** Group: TX/RX ************** */ /** @name TX / RX * Prototype for HTTPDs low-level send/recv functions * @{ */ #define HTTPD_SOCK_ERR_FAIL -1 #define HTTPD_SOCK_ERR_INVALID -2 #define HTTPD_SOCK_ERR_TIMEOUT -3 /** * @brief Prototype for HTTPDs low-level send function * * @note User specified send function must handle errors internally, * depending upon the set value of errno, and return specific * HTTPD_SOCK_ERR_ codes, which will eventually be conveyed as * return value of httpd_send() function * * @param[in] hd server instance * @param[in] sockfd session socket file descriptor * @param[in] buf buffer with bytes to send * @param[in] buf_len data size * @param[in] flags flags for the send() function * @return * - Bytes : The number of bytes sent successfully * - HTTPD_SOCK_ERR_INVALID : Invalid arguments * - HTTPD_SOCK_ERR_TIMEOUT : Timeout/interrupted while calling socket send() * - HTTPD_SOCK_ERR_FAIL : Unrecoverable error while calling socket send() */ typedef int (*httpd_send_func_t)(httpd_handle_t hd, int sockfd, const char *buf, size_t buf_len, int flags); /** * @brief Prototype for HTTPDs low-level recv function * * @note User specified recv function must handle errors internally, * depending upon the set value of errno, and return specific * HTTPD_SOCK_ERR_ codes, which will eventually be conveyed as * return value of httpd_req_recv() function * * @param[in] hd server instance * @param[in] sockfd session socket file descriptor * @param[in] buf buffer with bytes to send * @param[in] buf_len data size * @param[in] flags flags for the send() function * @return * - Bytes : The number of bytes received successfully * - 0 : Buffer length parameter is zero / connection closed by peer * - HTTPD_SOCK_ERR_INVALID : Invalid arguments * - HTTPD_SOCK_ERR_TIMEOUT : Timeout/interrupted while calling socket recv() * - HTTPD_SOCK_ERR_FAIL : Unrecoverable error while calling socket recv() */ typedef int (*httpd_recv_func_t)(httpd_handle_t hd, int sockfd, char *buf, size_t buf_len, int flags); /** * @brief Prototype for HTTPDs low-level "get pending bytes" function * * @note User specified pending function must handle errors internally, * depending upon the set value of errno, and return specific * HTTPD_SOCK_ERR_ codes, which will be handled accordingly in * the server task. * * @param[in] hd server instance * @param[in] sockfd session socket file descriptor * @return * - Bytes : The number of bytes waiting to be received * - HTTPD_SOCK_ERR_INVALID : Invalid arguments * - HTTPD_SOCK_ERR_TIMEOUT : Timeout/interrupted while calling socket pending() * - HTTPD_SOCK_ERR_FAIL : Unrecoverable error while calling socket pending() */ typedef int (*httpd_pending_func_t)(httpd_handle_t hd, int sockfd); /** End of TX / RX * @} */ /* ************** Group: Request/Response ************** */ /** @name Request / Response * APIs related to the data send/receive by URI handlers. * These APIs are supposed to be called only from the context of * a URI handler where httpd_req_t* request pointer is valid. * @{ */ /** * @brief Override web server's receive function (by session FD) * * This function overrides the web server's receive function. This same function is * used to read HTTP request packets. * * @note This API is supposed to be called either from the context of * - an http session APIs where sockfd is a valid parameter * - a URI handler where sockfd is obtained using httpd_req_to_sockfd() * * @param[in] hd HTTPD instance handle * @param[in] sockfd Session socket FD * @param[in] recv_func The receive function to be set for this session * * @return * - ESP_OK : On successfully registering override * - ESP_ERR_INVALID_ARG : Null arguments */ esp_err_t httpd_sess_set_recv_override(httpd_handle_t hd, int sockfd, httpd_recv_func_t recv_func); /** * @brief Override web server's send function (by session FD) * * This function overrides the web server's send function. This same function is * used to send out any response to any HTTP request. * * @note This API is supposed to be called either from the context of * - an http session APIs where sockfd is a valid parameter * - a URI handler where sockfd is obtained using httpd_req_to_sockfd() * * @param[in] hd HTTPD instance handle * @param[in] sockfd Session socket FD * @param[in] send_func The send function to be set for this session * * @return * - ESP_OK : On successfully registering override * - ESP_ERR_INVALID_ARG : Null arguments */ esp_err_t httpd_sess_set_send_override(httpd_handle_t hd, int sockfd, httpd_send_func_t send_func); /** * @brief Override web server's pending function (by session FD) * * This function overrides the web server's pending function. This function is * used to test for pending bytes in a socket. * * @note This API is supposed to be called either from the context of * - an http session APIs where sockfd is a valid parameter * - a URI handler where sockfd is obtained using httpd_req_to_sockfd() * * @param[in] hd HTTPD instance handle * @param[in] sockfd Session socket FD * @param[in] pending_func The receive function to be set for this session * * @return * - ESP_OK : On successfully registering override * - ESP_ERR_INVALID_ARG : Null arguments */ esp_err_t httpd_sess_set_pending_override(httpd_handle_t hd, int sockfd, httpd_pending_func_t pending_func); /** * @brief Start an asynchronous request. This function can be called * in a request handler to get a request copy that can be used on a async thread. * * @note * - This function is necessary in order to handle multiple requests simultaneously. * See examples/async_requests for example usage. * - You must call httpd_req_async_handler_complete() when you are done with the request. * * @param[in] r The request to create an async copy of * @param[out] out A newly allocated request which can be used on an async thread * * @return * - ESP_OK : async request object created */ esp_err_t httpd_req_async_handler_begin(httpd_req_t *r, httpd_req_t **out); /** * @brief Mark an asynchronous request as completed. This will * - free the request memory * - relinquish ownership of the underlying socket, so it can be reused. * - allow the http server to close our socket if needed (lru_purge_enable) * * @note If async requests are not marked completed, eventually the server * will no longer accept incoming connections. The server will log a * "httpd_accept_conn: error in accept (23)" message if this happens. * * @param[in] r The request to mark async work as completed * * @return * - ESP_OK : async request was marked completed */ esp_err_t httpd_req_async_handler_complete(httpd_req_t *r); /** * @brief Get the Socket Descriptor from the HTTP request * * This API will return the socket descriptor of the session for * which URI handler was executed on reception of HTTP request. * This is useful when user wants to call functions that require * session socket fd, from within a URI handler, ie. : * httpd_sess_get_ctx(), * httpd_sess_trigger_close(), * httpd_sess_update_lru_counter(). * * @note This API is supposed to be called only from the context of * a URI handler where httpd_req_t* request pointer is valid. * * @param[in] r The request whose socket descriptor should be found * * @return * - Socket descriptor : The socket descriptor for this request * - -1 : Invalid/NULL request pointer */ int httpd_req_to_sockfd(httpd_req_t *r); /** * @brief API to read content data from the HTTP request * * This API will read HTTP content data from the HTTP request into * provided buffer. Use content_len provided in httpd_req_t structure * to know the length of data to be fetched. If content_len is too * large for the buffer then user may have to make multiple calls to * this function, each time fetching 'buf_len' number of bytes, * while the pointer to content data is incremented internally by * the same number. * * @note * - This API is supposed to be called only from the context of * a URI handler where httpd_req_t* request pointer is valid. * - If an error is returned, the URI handler must further return an error. * This will ensure that the erroneous socket is closed and cleaned up by * the web server. * - Presently Chunked Encoding is not supported * * @param[in] r The request being responded to * @param[in] buf Pointer to a buffer that the data will be read into * @param[in] buf_len Length of the buffer * * @return * - Bytes : Number of bytes read into the buffer successfully * - 0 : Buffer length parameter is zero / connection closed by peer * - HTTPD_SOCK_ERR_INVALID : Invalid arguments * - HTTPD_SOCK_ERR_TIMEOUT : Timeout/interrupted while calling socket recv() * - HTTPD_SOCK_ERR_FAIL : Unrecoverable error while calling socket recv() */ int httpd_req_recv(httpd_req_t *r, char *buf, size_t buf_len); /** * @brief Search for a field in request headers and * return the string length of it's value * * @note * - This API is supposed to be called only from the context of * a URI handler where httpd_req_t* request pointer is valid. * - Once httpd_resp_send() API is called all request headers * are purged, so request headers need be copied into separate * buffers if they are required later. * * @param[in] r The request being responded to * @param[in] field The header field to be searched in the request * * @return * - Length : If field is found in the request URL * - Zero : Field not found / Invalid request / Null arguments */ size_t httpd_req_get_hdr_value_len(httpd_req_t *r, const char *field); /** * @brief Get the value string of a field from the request headers * * @note * - This API is supposed to be called only from the context of * a URI handler where httpd_req_t* request pointer is valid. * - Once httpd_resp_send() API is called all request headers * are purged, so request headers need be copied into separate * buffers if they are required later. * - If output size is greater than input, then the value is truncated, * accompanied by truncation error as return value. * - Use httpd_req_get_hdr_value_len() to know the right buffer length * * @param[in] r The request being responded to * @param[in] field The field to be searched in the header * @param[out] val Pointer to the buffer into which the value will be copied if the field is found * @param[in] val_size Size of the user buffer "val" * * @return * - ESP_OK : Field found in the request header and value string copied * - ESP_ERR_NOT_FOUND : Key not found * - ESP_ERR_INVALID_ARG : Null arguments * - ESP_ERR_HTTPD_INVALID_REQ : Invalid HTTP request pointer * - ESP_ERR_HTTPD_RESULT_TRUNC : Value string truncated */ esp_err_t httpd_req_get_hdr_value_str(httpd_req_t *r, const char *field, char *val, size_t val_size); /** * @brief Get Query string length from the request URL * * @note This API is supposed to be called only from the context of * a URI handler where httpd_req_t* request pointer is valid * * @param[in] r The request being responded to * * @return * - Length : Query is found in the request URL * - Zero : Query not found / Null arguments / Invalid request */ size_t httpd_req_get_url_query_len(httpd_req_t *r); /** * @brief Get Query string from the request URL * * @note * - Presently, the user can fetch the full URL query string, but decoding * will have to be performed by the user. Request headers can be read using * httpd_req_get_hdr_value_str() to know the 'Content-Type' (eg. Content-Type: * application/x-www-form-urlencoded) and then the appropriate decoding * algorithm needs to be applied. * - This API is supposed to be called only from the context of * a URI handler where httpd_req_t* request pointer is valid * - If output size is greater than input, then the value is truncated, * accompanied by truncation error as return value * - Prior to calling this function, one can use httpd_req_get_url_query_len() * to know the query string length beforehand and hence allocate the buffer * of right size (usually query string length + 1 for null termination) * for storing the query string * * @param[in] r The request being responded to * @param[out] buf Pointer to the buffer into which the query string will be copied (if found) * @param[in] buf_len Length of output buffer * * @return * - ESP_OK : Query is found in the request URL and copied to buffer * - ESP_ERR_NOT_FOUND : Query not found * - ESP_ERR_INVALID_ARG : Null arguments * - ESP_ERR_HTTPD_INVALID_REQ : Invalid HTTP request pointer * - ESP_ERR_HTTPD_RESULT_TRUNC : Query string truncated */ esp_err_t httpd_req_get_url_query_str(httpd_req_t *r, char *buf, size_t buf_len); /** * @brief Helper function to get a URL query tag from a query * string of the type param1=val1¶m2=val2 * * @note * - The components of URL query string (keys and values) are not URLdecoded. * The user must check for 'Content-Type' field in the request headers and * then depending upon the specified encoding (URLencoded or otherwise) apply * the appropriate decoding algorithm. * - If actual value size is greater than val_size, then the value is truncated, * accompanied by truncation error as return value. * * @param[in] qry Pointer to query string * @param[in] key The key to be searched in the query string * @param[out] val Pointer to the buffer into which the value will be copied if the key is found * @param[in] val_size Size of the user buffer "val" * * @return * - ESP_OK : Key is found in the URL query string and copied to buffer * - ESP_ERR_NOT_FOUND : Key not found * - ESP_ERR_INVALID_ARG : Null arguments * - ESP_ERR_HTTPD_RESULT_TRUNC : Value string truncated */ esp_err_t httpd_query_key_value(const char *qry, const char *key, char *val, size_t val_size); /** * @brief Get the value string of a cookie value from the "Cookie" request headers by cookie name. * * @param[in] req Pointer to the HTTP request * @param[in] cookie_name The cookie name to be searched in the request * @param[out] val Pointer to the buffer into which the value of cookie will be copied if the cookie is found * @param[inout] val_size Pointer to size of the user buffer "val". This variable will contain cookie length if * ESP_OK is returned and required buffer length incase ESP_ERR_HTTPD_RESULT_TRUNC is returned. * * @return * - ESP_OK : Key is found in the cookie string and copied to buffer * - ESP_ERR_NOT_FOUND : Key not found * - ESP_ERR_INVALID_ARG : Null arguments * - ESP_ERR_HTTPD_RESULT_TRUNC : Value string truncated * - ESP_ERR_NO_MEM : Memory allocation failure */ esp_err_t httpd_req_get_cookie_val(httpd_req_t *req, const char *cookie_name, char *val, size_t *val_size); /** * @brief Test if a URI matches the given wildcard template. * * Template may end with "?" to make the previous character optional (typically a slash), * "*" for a wildcard match, and "?*" to make the previous character optional, and if present, * allow anything to follow. * * Example: * - * matches everything * - /foo/? matches /foo and /foo/ * - /foo/\* (sans the backslash) matches /foo/ and /foo/bar, but not /foo or /fo * - /foo/?* or /foo/\*? (sans the backslash) matches /foo/, /foo/bar, and also /foo, but not /foox or /fo * * The special characters "?" and "*" anywhere else in the template will be taken literally. * * @param[in] uri_template URI template (pattern) * @param[in] uri_to_match URI to be matched * @param[in] match_upto how many characters of the URI buffer to test * (there may be trailing query string etc.) * * @return true if a match was found */ bool httpd_uri_match_wildcard(const char *uri_template, const char *uri_to_match, size_t match_upto); /** * @brief API to send a complete HTTP response. * * This API will send the data as an HTTP response to the request. * This assumes that you have the entire response ready in a single * buffer. If you wish to send response in incremental chunks use * httpd_resp_send_chunk() instead. * * If no status code and content-type were set, by default this * will send 200 OK status code and content type as text/html. * You may call the following functions before this API to configure * the response headers : * httpd_resp_set_status() - for setting the HTTP status string, * httpd_resp_set_type() - for setting the Content Type, * httpd_resp_set_hdr() - for appending any additional field * value entries in the response header * * @note * - This API is supposed to be called only from the context of * a URI handler where httpd_req_t* request pointer is valid. * - Once this API is called, the request has been responded to. * - No additional data can then be sent for the request. * - Once this API is called, all request headers are purged, so * request headers need be copied into separate buffers if * they are required later. * * @param[in] r The request being responded to * @param[in] buf Buffer from where the content is to be fetched * @param[in] buf_len Length of the buffer, HTTPD_RESP_USE_STRLEN to use strlen() * * @return * - ESP_OK : On successfully sending the response packet * - ESP_ERR_INVALID_ARG : Null request pointer * - ESP_ERR_HTTPD_RESP_HDR : Essential headers are too large for internal buffer * - ESP_ERR_HTTPD_RESP_SEND : Error in raw send * - ESP_ERR_HTTPD_INVALID_REQ : Invalid request */ esp_err_t httpd_resp_send(httpd_req_t *r, const char *buf, ssize_t buf_len); /** * @brief API to send one HTTP chunk * * This API will send the data as an HTTP response to the * request. This API will use chunked-encoding and send the response * in the form of chunks. If you have the entire response contained in * a single buffer, please use httpd_resp_send() instead. * * If no status code and content-type were set, by default this will * send 200 OK status code and content type as text/html. You may * call the following functions before this API to configure the * response headers * httpd_resp_set_status() - for setting the HTTP status string, * httpd_resp_set_type() - for setting the Content Type, * httpd_resp_set_hdr() - for appending any additional field * value entries in the response header * * @note * - This API is supposed to be called only from the context of * a URI handler where httpd_req_t* request pointer is valid. * - When you are finished sending all your chunks, you must call * this function with buf_len as 0. * - Once this API is called, all request headers are purged, so * request headers need be copied into separate buffers if they * are required later. * * @param[in] r The request being responded to * @param[in] buf Pointer to a buffer that stores the data * @param[in] buf_len Length of the buffer, HTTPD_RESP_USE_STRLEN to use strlen() * * @return * - ESP_OK : On successfully sending the response packet chunk * - ESP_ERR_INVALID_ARG : Null request pointer * - ESP_ERR_HTTPD_RESP_HDR : Essential headers are too large for internal buffer * - ESP_ERR_HTTPD_RESP_SEND : Error in raw send * - ESP_ERR_HTTPD_INVALID_REQ : Invalid request pointer */ esp_err_t httpd_resp_send_chunk(httpd_req_t *r, const char *buf, ssize_t buf_len); /** * @brief API to send a complete string as HTTP response. * * This API simply calls http_resp_send with buffer length * set to string length assuming the buffer contains a null * terminated string * * @param[in] r The request being responded to * @param[in] str String to be sent as response body * * @return * - ESP_OK : On successfully sending the response packet * - ESP_ERR_INVALID_ARG : Null request pointer * - ESP_ERR_HTTPD_RESP_HDR : Essential headers are too large for internal buffer * - ESP_ERR_HTTPD_RESP_SEND : Error in raw send * - ESP_ERR_HTTPD_INVALID_REQ : Invalid request */ static inline esp_err_t httpd_resp_sendstr(httpd_req_t *r, const char *str) { return httpd_resp_send(r, str, (str == NULL) ? 0 : HTTPD_RESP_USE_STRLEN); } /** * @brief API to send a string as an HTTP response chunk. * * This API simply calls http_resp_send_chunk with buffer length * set to string length assuming the buffer contains a null * terminated string * * @param[in] r The request being responded to * @param[in] str String to be sent as response body (NULL to finish response packet) * * @return * - ESP_OK : On successfully sending the response packet * - ESP_ERR_INVALID_ARG : Null request pointer * - ESP_ERR_HTTPD_RESP_HDR : Essential headers are too large for internal buffer * - ESP_ERR_HTTPD_RESP_SEND : Error in raw send * - ESP_ERR_HTTPD_INVALID_REQ : Invalid request */ static inline esp_err_t httpd_resp_sendstr_chunk(httpd_req_t *r, const char *str) { return httpd_resp_send_chunk(r, str, (str == NULL) ? 0 : HTTPD_RESP_USE_STRLEN); } /* Some commonly used status codes */ #define HTTPD_200 "200 OK" /*!< HTTP Response 200 */ #define HTTPD_204 "204 No Content" /*!< HTTP Response 204 */ #define HTTPD_207 "207 Multi-Status" /*!< HTTP Response 207 */ #define HTTPD_400 "400 Bad Request" /*!< HTTP Response 400 */ #define HTTPD_404 "404 Not Found" /*!< HTTP Response 404 */ #define HTTPD_408 "408 Request Timeout" /*!< HTTP Response 408 */ #define HTTPD_500 "500 Internal Server Error" /*!< HTTP Response 500 */ /** * @brief API to set the HTTP status code * * This API sets the status of the HTTP response to the value specified. * By default, the '200 OK' response is sent as the response. * * @note * - This API is supposed to be called only from the context of * a URI handler where httpd_req_t* request pointer is valid. * - This API only sets the status to this value. The status isn't * sent out until any of the send APIs is executed. * - Make sure that the lifetime of the status string is valid till * send function is called. * * @param[in] r The request being responded to * @param[in] status The HTTP status code of this response * * @return * - ESP_OK : On success * - ESP_ERR_INVALID_ARG : Null arguments * - ESP_ERR_HTTPD_INVALID_REQ : Invalid request pointer */ esp_err_t httpd_resp_set_status(httpd_req_t *r, const char *status); /* Some commonly used content types */ #define HTTPD_TYPE_JSON "application/json" /*!< HTTP Content type JSON */ #define HTTPD_TYPE_TEXT "text/html" /*!< HTTP Content type text/HTML */ #define HTTPD_TYPE_OCTET "application/octet-stream" /*!< HTTP Content type octext-stream */ /** * @brief API to set the HTTP content type * * This API sets the 'Content Type' field of the response. * The default content type is 'text/html'. * * @note * - This API is supposed to be called only from the context of * a URI handler where httpd_req_t* request pointer is valid. * - This API only sets the content type to this value. The type * isn't sent out until any of the send APIs is executed. * - Make sure that the lifetime of the type string is valid till * send function is called. * * @param[in] r The request being responded to * @param[in] type The Content Type of the response * * @return * - ESP_OK : On success * - ESP_ERR_INVALID_ARG : Null arguments * - ESP_ERR_HTTPD_INVALID_REQ : Invalid request pointer */ esp_err_t httpd_resp_set_type(httpd_req_t *r, const char *type); /** * @brief API to append any additional headers * * This API sets any additional header fields that need to be sent in the response. * * @note * - This API is supposed to be called only from the context of * a URI handler where httpd_req_t* request pointer is valid. * - The header isn't sent out until any of the send APIs is executed. * - The maximum allowed number of additional headers is limited to * value of max_resp_headers in config structure. * - Make sure that the lifetime of the field value strings are valid till * send function is called. * * @param[in] r The request being responded to * @param[in] field The field name of the HTTP header * @param[in] value The value of this HTTP header * * @return * - ESP_OK : On successfully appending new header * - ESP_ERR_INVALID_ARG : Null arguments * - ESP_ERR_HTTPD_RESP_HDR : Total additional headers exceed max allowed * - ESP_ERR_HTTPD_INVALID_REQ : Invalid request pointer */ esp_err_t httpd_resp_set_hdr(httpd_req_t *r, const char *field, const char *value); /** * @brief For sending out error code in response to HTTP request. * * @note * - This API is supposed to be called only from the context of * a URI handler where httpd_req_t* request pointer is valid. * - Once this API is called, all request headers are purged, so * request headers need be copied into separate buffers if * they are required later. * - If you wish to send additional data in the body of the * response, please use the lower-level functions directly. * * @param[in] req Pointer to the HTTP request for which the response needs to be sent * @param[in] error Error type to send * @param[in] msg Error message string (pass NULL for default message) * * @return * - ESP_OK : On successfully sending the response packet * - ESP_ERR_INVALID_ARG : Null arguments * - ESP_ERR_HTTPD_RESP_SEND : Error in raw send * - ESP_ERR_HTTPD_INVALID_REQ : Invalid request pointer */ esp_err_t httpd_resp_send_err(httpd_req_t *req, httpd_err_code_t error, const char *msg); /** * @brief For sending out custom error code in response to HTTP request. * * @note * - This API is supposed to be called only from the context of * a URI handler where httpd_req_t* request pointer is valid. * - Once this API is called, all request headers are purged, so * request headers need be copied into separate buffers if * they are required later. * - If you wish to send additional data in the body of the * response, please use the lower-level functions directly. * * @param[in] req Pointer to the HTTP request for which the response needs to be sent * @param[in] status Error status to send * @param[in] msg Error message string * * @return * - ESP_OK : On successfully sending the response packet * - ESP_ERR_INVALID_ARG : Null arguments * - ESP_ERR_HTTPD_RESP_SEND : Error in raw send * - ESP_ERR_HTTPD_INVALID_REQ : Invalid request pointer */ esp_err_t httpd_resp_send_custom_err(httpd_req_t *req, const char *status, const char *msg); /** * @brief Helper function for HTTP 404 * * Send HTTP 404 message. If you wish to send additional data in the body of the * response, please use the lower-level functions directly. * * @note * - This API is supposed to be called only from the context of * a URI handler where httpd_req_t* request pointer is valid. * - Once this API is called, all request headers are purged, so * request headers need be copied into separate buffers if * they are required later. * * @param[in] r The request being responded to * * @return * - ESP_OK : On successfully sending the response packet * - ESP_ERR_INVALID_ARG : Null arguments * - ESP_ERR_HTTPD_RESP_SEND : Error in raw send * - ESP_ERR_HTTPD_INVALID_REQ : Invalid request pointer */ static inline esp_err_t httpd_resp_send_404(httpd_req_t *r) { return httpd_resp_send_err(r, HTTPD_404_NOT_FOUND, NULL); } /** * @brief Helper function for HTTP 408 * * Send HTTP 408 message. If you wish to send additional data in the body of the * response, please use the lower-level functions directly. * * @note * - This API is supposed to be called only from the context of * a URI handler where httpd_req_t* request pointer is valid. * - Once this API is called, all request headers are purged, so * request headers need be copied into separate buffers if * they are required later. * * @param[in] r The request being responded to * * @return * - ESP_OK : On successfully sending the response packet * - ESP_ERR_INVALID_ARG : Null arguments * - ESP_ERR_HTTPD_RESP_SEND : Error in raw send * - ESP_ERR_HTTPD_INVALID_REQ : Invalid request pointer */ static inline esp_err_t httpd_resp_send_408(httpd_req_t *r) { return httpd_resp_send_err(r, HTTPD_408_REQ_TIMEOUT, NULL); } /** * @brief Helper function for HTTP 500 * * Send HTTP 500 message. If you wish to send additional data in the body of the * response, please use the lower-level functions directly. * * @note * - This API is supposed to be called only from the context of * a URI handler where httpd_req_t* request pointer is valid. * - Once this API is called, all request headers are purged, so * request headers need be copied into separate buffers if * they are required later. * * @param[in] r The request being responded to * * @return * - ESP_OK : On successfully sending the response packet * - ESP_ERR_INVALID_ARG : Null arguments * - ESP_ERR_HTTPD_RESP_SEND : Error in raw send * - ESP_ERR_HTTPD_INVALID_REQ : Invalid request pointer */ static inline esp_err_t httpd_resp_send_500(httpd_req_t *r) { return httpd_resp_send_err(r, HTTPD_500_INTERNAL_SERVER_ERROR, NULL); } /** * @brief Raw HTTP send * * Call this API if you wish to construct your custom response packet. * When using this, all essential header, eg. HTTP version, Status Code, * Content Type and Length, Encoding, etc. will have to be constructed * manually, and HTTP delimeters (CRLF) will need to be placed correctly * for separating sub-sections of the HTTP response packet. * * If the send override function is set, this API will end up * calling that function eventually to send data out. * * @note * - This API is supposed to be called only from the context of * a URI handler where httpd_req_t* request pointer is valid. * - Unless the response has the correct HTTP structure (which the * user must now ensure) it is not guaranteed that it will be * recognized by the client. For most cases, you wouldn't have * to call this API, but you would rather use either of : * httpd_resp_send(), * httpd_resp_send_chunk() * * @param[in] r The request being responded to * @param[in] buf Buffer from where the fully constructed packet is to be read * @param[in] buf_len Length of the buffer * * @return * - Bytes : Number of bytes that were sent successfully * - HTTPD_SOCK_ERR_INVALID : Invalid arguments * - HTTPD_SOCK_ERR_TIMEOUT : Timeout/interrupted while calling socket send() * - HTTPD_SOCK_ERR_FAIL : Unrecoverable error while calling socket send() */ int httpd_send(httpd_req_t *r, const char *buf, size_t buf_len); /** * A low level API to send data on a given socket * * @note This API is not recommended to be used in any request handler. * Use this only for advanced use cases, wherein some asynchronous * data is to be sent over a socket. * * This internally calls the default send function, or the function registered by * httpd_sess_set_send_override(). * * @param[in] hd server instance * @param[in] sockfd session socket file descriptor * @param[in] buf buffer with bytes to send * @param[in] buf_len data size * @param[in] flags flags for the send() function * @return * - Bytes : The number of bytes sent successfully * - HTTPD_SOCK_ERR_INVALID : Invalid arguments * - HTTPD_SOCK_ERR_TIMEOUT : Timeout/interrupted while calling socket send() * - HTTPD_SOCK_ERR_FAIL : Unrecoverable error while calling socket send() */ int httpd_socket_send(httpd_handle_t hd, int sockfd, const char *buf, size_t buf_len, int flags); /** * A low level API to receive data from a given socket * * @note This API is not recommended to be used in any request handler. * Use this only for advanced use cases, wherein some asynchronous * communication is required. * * This internally calls the default recv function, or the function registered by * httpd_sess_set_recv_override(). * * @param[in] hd server instance * @param[in] sockfd session socket file descriptor * @param[in] buf buffer with bytes to send * @param[in] buf_len data size * @param[in] flags flags for the send() function * @return * - Bytes : The number of bytes received successfully * - 0 : Buffer length parameter is zero / connection closed by peer * - HTTPD_SOCK_ERR_INVALID : Invalid arguments * - HTTPD_SOCK_ERR_TIMEOUT : Timeout/interrupted while calling socket recv() * - HTTPD_SOCK_ERR_FAIL : Unrecoverable error while calling socket recv() */ int httpd_socket_recv(httpd_handle_t hd, int sockfd, char *buf, size_t buf_len, int flags); /** End of Request / Response * @} */ /* ************** Group: Session ************** */ /** @name Session * Functions for controlling sessions and accessing context data * @{ */ /** * @brief Get session context from socket descriptor * * Typically if a session context is created, it is available to URI handlers * through the httpd_req_t structure. But, there are cases where the web * server's send/receive functions may require the context (for example, for * accessing keying information etc). Since the send/receive function only have * the socket descriptor at their disposal, this API provides them with a way to * retrieve the session context. * * @param[in] handle Handle to server returned by httpd_start * @param[in] sockfd The socket descriptor for which the context should be extracted. * * @return * - void* : Pointer to the context associated with this session * - NULL : Empty context / Invalid handle / Invalid socket fd */ void *httpd_sess_get_ctx(httpd_handle_t handle, int sockfd); /** * @brief Set session context by socket descriptor * * @param[in] handle Handle to server returned by httpd_start * @param[in] sockfd The socket descriptor for which the context should be extracted. * @param[in] ctx Context object to assign to the session * @param[in] free_fn Function that should be called to free the context */ void httpd_sess_set_ctx(httpd_handle_t handle, int sockfd, void *ctx, httpd_free_ctx_fn_t free_fn); /** * @brief Get session 'transport' context by socket descriptor * @see httpd_sess_get_ctx() * * This context is used by the send/receive functions, for example to manage SSL context. * * @param[in] handle Handle to server returned by httpd_start * @param[in] sockfd The socket descriptor for which the context should be extracted. * @return * - void* : Pointer to the transport context associated with this session * - NULL : Empty context / Invalid handle / Invalid socket fd */ void *httpd_sess_get_transport_ctx(httpd_handle_t handle, int sockfd); /** * @brief Set session 'transport' context by socket descriptor * @see httpd_sess_set_ctx() * * @param[in] handle Handle to server returned by httpd_start * @param[in] sockfd The socket descriptor for which the context should be extracted. * @param[in] ctx Transport context object to assign to the session * @param[in] free_fn Function that should be called to free the transport context */ void httpd_sess_set_transport_ctx(httpd_handle_t handle, int sockfd, void *ctx, httpd_free_ctx_fn_t free_fn); /** * @brief Get HTTPD global user context (it was set in the server config struct) * * @param[in] handle Handle to server returned by httpd_start * @return global user context */ void *httpd_get_global_user_ctx(httpd_handle_t handle); /** * @brief Get HTTPD global transport context (it was set in the server config struct) * * @param[in] handle Handle to server returned by httpd_start * @return global transport context */ void *httpd_get_global_transport_ctx(httpd_handle_t handle); /** * @brief Trigger an httpd session close externally * * @note Calling this API is only required in special circumstances wherein * some application requires to close an httpd client session asynchronously. * * @param[in] handle Handle to server returned by httpd_start * @param[in] sockfd The socket descriptor of the session to be closed * * @return * - ESP_OK : On successfully initiating closure * - ESP_FAIL : Failure to queue work * - ESP_ERR_NOT_FOUND : Socket fd not found * - ESP_ERR_INVALID_ARG : Null arguments */ esp_err_t httpd_sess_trigger_close(httpd_handle_t handle, int sockfd); /** * @brief Update LRU counter for a given socket * * LRU Counters are internally associated with each session to monitor * how recently a session exchanged traffic. When LRU purge is enabled, * if a client is requesting for connection but maximum number of * sockets/sessions is reached, then the session having the earliest * LRU counter is closed automatically. * * Updating the LRU counter manually prevents the socket from being purged * due to the Least Recently Used (LRU) logic, even though it might not * have received traffic for some time. This is useful when all open * sockets/session are frequently exchanging traffic but the user specifically * wants one of the sessions to be kept open, irrespective of when it last * exchanged a packet. * * @note Calling this API is only necessary if the LRU Purge Enable option * is enabled. * * @param[in] handle Handle to server returned by httpd_start * @param[in] sockfd The socket descriptor of the session for which LRU counter * is to be updated * * @return * - ESP_OK : Socket found and LRU counter updated * - ESP_ERR_NOT_FOUND : Socket not found * - ESP_ERR_INVALID_ARG : Null arguments */ esp_err_t httpd_sess_update_lru_counter(httpd_handle_t handle, int sockfd); /** * @brief Returns list of current socket descriptors of active sessions * * @param[in] handle Handle to server returned by httpd_start * @param[in,out] fds In: Size of provided client_fds array * Out: Number of valid client fds returned in client_fds, * @param[out] client_fds Array of client fds * * @note Size of provided array has to be equal or greater then maximum number of opened * sockets, configured upon initialization with max_open_sockets field in * httpd_config_t structure. * * @return * - ESP_OK : Successfully retrieved session list * - ESP_ERR_INVALID_ARG : Wrong arguments or list is longer than provided array */ esp_err_t httpd_get_client_list(httpd_handle_t handle, size_t *fds, int *client_fds); /** End of Session * @} */ /* ************** Group: Work Queue ************** */ /** @name Work Queue * APIs related to the HTTPD Work Queue * @{ */ /** * @brief Prototype of the HTTPD work function * Please refer to httpd_queue_work() for more details. * @param[in] arg The arguments for this work function */ typedef void (*httpd_work_fn_t)(void *arg); /** * @brief Queue execution of a function in HTTPD's context * * This API queues a work function for asynchronous execution * * @note Some protocols require that the web server generate some asynchronous data * and send it to the persistently opened connection. This facility is for use * by such protocols. * * @param[in] handle Handle to server returned by httpd_start * @param[in] work Pointer to the function to be executed in the HTTPD's context * @param[in] arg Pointer to the arguments that should be passed to this function * * @return * - ESP_OK : On successfully queueing the work * - ESP_FAIL : Failure in ctrl socket * - ESP_ERR_INVALID_ARG : Null arguments */ esp_err_t httpd_queue_work(httpd_handle_t handle, httpd_work_fn_t work, void *arg); /** End of Group Work Queue * @} */ /* ************** Group: WebSocket ************** */ /** @name WebSocket * Functions and structs for WebSocket server * @{ */ #ifdef CONFIG_HTTPD_WS_SUPPORT /** * @brief Enum for WebSocket packet types (Opcode in the header) * @note Please refer to RFC6455 Section 5.4 for more details */ typedef enum { HTTPD_WS_TYPE_CONTINUE = 0x0, HTTPD_WS_TYPE_TEXT = 0x1, HTTPD_WS_TYPE_BINARY = 0x2, HTTPD_WS_TYPE_CLOSE = 0x8, HTTPD_WS_TYPE_PING = 0x9, HTTPD_WS_TYPE_PONG = 0xA } httpd_ws_type_t; /** * @brief Enum for client info description */ typedef enum { HTTPD_WS_CLIENT_INVALID = 0x0, HTTPD_WS_CLIENT_HTTP = 0x1, HTTPD_WS_CLIENT_WEBSOCKET = 0x2, } httpd_ws_client_info_t; /** * @brief WebSocket frame format */ typedef struct httpd_ws_frame { bool final; /*!< Final frame: For received frames this field indicates whether the `FIN` flag was set. For frames to be transmitted, this field is only used if the `fragmented` option is set as well. If `fragmented` is false, the `FIN` flag is set by default, marking the ws_frame as a complete/unfragmented message (esp_http_server doesn't automatically fragment messages) */ bool fragmented; /*!< Indication that the frame allocated for transmission is a message fragment, so the `FIN` flag is set manually according to the `final` option. This flag is never set for received messages */ httpd_ws_type_t type; /*!< WebSocket frame type */ uint8_t *payload; /*!< Pre-allocated data buffer */ size_t len; /*!< Length of the WebSocket data */ } httpd_ws_frame_t; /** * @brief Transfer complete callback */ typedef void (*transfer_complete_cb)(esp_err_t err, int socket, void *arg); /** * @brief Receive and parse a WebSocket frame * * @note Calling httpd_ws_recv_frame() with max_len as 0 will give actual frame size in pkt->len. * The user can dynamically allocate space for pkt->payload as per this length and call httpd_ws_recv_frame() again to get the actual data. * Please refer to the corresponding example for usage. * * @param[in] req Current request * @param[out] pkt WebSocket packet * @param[in] max_len Maximum length for receive * @return * - ESP_OK : On successful * - ESP_FAIL : Socket errors occurs * - ESP_ERR_INVALID_STATE : Handshake was already done beforehand * - ESP_ERR_INVALID_ARG : Argument is invalid (null or non-WebSocket) */ esp_err_t httpd_ws_recv_frame(httpd_req_t *req, httpd_ws_frame_t *pkt, size_t max_len); /** * @brief Construct and send a WebSocket frame * @param[in] req Current request * @param[in] pkt WebSocket frame * @return * - ESP_OK : On successful * - ESP_FAIL : When socket errors occurs * - ESP_ERR_INVALID_STATE : Handshake was already done beforehand * - ESP_ERR_INVALID_ARG : Argument is invalid (null or non-WebSocket) */ esp_err_t httpd_ws_send_frame(httpd_req_t *req, httpd_ws_frame_t *pkt); /** * @brief Low level send of a WebSocket frame out of the scope of current request * using internally configured httpd send function * * This API should rarely be called directly, with an exception of asynchronous send using httpd_queue_work. * * @param[in] hd Server instance data * @param[in] fd Socket descriptor for sending data * @param[in] frame WebSocket frame * @return * - ESP_OK : On successful * - ESP_FAIL : When socket errors occurs * - ESP_ERR_INVALID_STATE : Handshake was already done beforehand * - ESP_ERR_INVALID_ARG : Argument is invalid (null or non-WebSocket) */ esp_err_t httpd_ws_send_frame_async(httpd_handle_t hd, int fd, httpd_ws_frame_t *frame); /** * @brief Checks the supplied socket descriptor if it belongs to any active client * of this server instance and if the websoket protocol is active * * @param[in] hd Server instance data * @param[in] fd Socket descriptor * @return * - HTTPD_WS_CLIENT_INVALID : This fd is not a client of this httpd * - HTTPD_WS_CLIENT_HTTP : This fd is an active client, protocol is not WS * - HTTPD_WS_CLIENT_WEBSOCKET : This fd is an active client, protocol is WS */ httpd_ws_client_info_t httpd_ws_get_fd_info(httpd_handle_t hd, int fd); /** * @brief Sends data to to specified websocket synchronously * * @param[in] handle Server instance data * @param[in] socket Socket descriptor * @param[in] frame Websocket frame * @return * - ESP_OK : On successful * - ESP_FAIL : When socket errors occurs * - ESP_ERR_NO_MEM : Unable to allocate memory */ esp_err_t httpd_ws_send_data(httpd_handle_t handle, int socket, httpd_ws_frame_t *frame); /** * @brief Sends data to to specified websocket asynchronously * * @param[in] handle Server instance data * @param[in] socket Socket descriptor * @param[in] frame Websocket frame * @param[in] callback Callback invoked after sending data * @param[in] arg User data passed to provided callback * @return * - ESP_OK : On successful * - ESP_FAIL : When socket errors occurs * - ESP_ERR_NO_MEM : Unable to allocate memory */ esp_err_t httpd_ws_send_data_async(httpd_handle_t handle, int socket, httpd_ws_frame_t *frame, transfer_complete_cb callback, void *arg); #endif /* CONFIG_HTTPD_WS_SUPPORT */ /** End of WebSocket related stuff * @} */ #ifdef __cplusplus } #endif #endif /* ! _ESP_HTTP_SERVER_H_ */