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esp-idf/components/esp_http_server/src/esp_httpd_priv.h

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// Copyright 2018 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef _HTTPD_PRIV_H_
#define _HTTPD_PRIV_H_
#include <stdbool.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <esp_log.h>
#include <esp_err.h>
#include <esp_http_server.h>
#include "osal.h"
#ifdef __cplusplus
extern "C" {
#endif
/* Size of request data block/chunk (not to be confused with chunked encoded data)
* that is received and parsed in one turn of the parsing process. This should not
* exceed the scratch buffer size and should at least be 8 bytes */
#define PARSER_BLOCK_SIZE 128
/* Calculate the maximum size needed for the scratch buffer */
#define HTTPD_SCRATCH_BUF MAX(HTTPD_MAX_REQ_HDR_LEN, HTTPD_MAX_URI_LEN)
/* Formats a log string to prepend context function name */
#define LOG_FMT(x) "%s: " x, __func__
/**
* @brief Thread related data for internal use
*/
struct thread_data {
othread_t handle; /*!< Handle to thread/task */
enum {
THREAD_IDLE = 0,
THREAD_RUNNING,
THREAD_STOPPING,
THREAD_STOPPED,
} status; /*!< State of the thread */
};
/**
* @brief A database of all the open sockets in the system.
*/
struct sock_db {
int fd; /*!< The file descriptor for this socket */
void *ctx; /*!< A custom context for this socket */
bool ignore_sess_ctx_changes; /*!< Flag indicating if session context changes should be ignored */
void *transport_ctx; /*!< A custom 'transport' context for this socket, to be used by send/recv/pending */
httpd_handle_t handle; /*!< Server handle */
httpd_free_ctx_fn_t free_ctx; /*!< Function for freeing the context */
httpd_free_ctx_fn_t free_transport_ctx; /*!< Function for freeing the 'transport' context */
httpd_send_func_t send_fn; /*!< Send function for this socket */
httpd_recv_func_t recv_fn; /*!< Receive function for this socket */
httpd_pending_func_t pending_fn; /*!< Pending function for this socket */
uint64_t lru_counter; /*!< LRU Counter indicating when the socket was last used */
bool lru_socket; /*!< Flag indicating LRU socket */
char pending_data[PARSER_BLOCK_SIZE]; /*!< Buffer for pending data to be received */
size_t pending_len; /*!< Length of pending data to be received */
#ifdef CONFIG_HTTPD_WS_SUPPORT
bool ws_handshake_done; /*!< True if it has done WebSocket handshake (if this socket is a valid WS) */
bool ws_close; /*!< Set to true to close the socket later (when WS Close frame received) */
esp_err_t (*ws_handler)(httpd_req_t *r); /*!< WebSocket handler, leave to null if it's not WebSocket */
#endif
};
/**
* @brief Auxiliary data structure for use during reception and processing
* of requests and temporarily keeping responses
*/
struct httpd_req_aux {
struct sock_db *sd; /*!< Pointer to socket database */
char scratch[HTTPD_SCRATCH_BUF + 1]; /*!< Temporary buffer for our operations (1 byte extra for null termination) */
size_t remaining_len; /*!< Amount of data remaining to be fetched */
char *status; /*!< HTTP response's status code */
char *content_type; /*!< HTTP response's content type */
bool first_chunk_sent; /*!< Used to indicate if first chunk sent */
unsigned req_hdrs_count; /*!< Count of total headers in request packet */
unsigned resp_hdrs_count; /*!< Count of additional headers in response packet */
struct resp_hdr {
const char *field;
const char *value;
} *resp_hdrs; /*!< Additional headers in response packet */
struct http_parser_url url_parse_res; /*!< URL parsing result, used for retrieving URL elements */
#ifdef CONFIG_HTTPD_WS_SUPPORT
bool ws_handshake_detect; /*!< WebSocket handshake detection flag */
httpd_ws_type_t ws_type; /*!< WebSocket frame type */
bool ws_final; /*!< WebSocket FIN bit (final frame or not) */
#endif
};
/**
* @brief Server data for each instance. This is exposed publicly as
* httpd_handle_t but internal structure/members are kept private.
*/
struct httpd_data {
httpd_config_t config; /*!< HTTPD server configuration */
int listen_fd; /*!< Server listener FD */
int ctrl_fd; /*!< Ctrl message receiver FD */
int msg_fd; /*!< Ctrl message sender FD */
struct thread_data hd_td; /*!< Information for the HTTPD thread */
struct sock_db *hd_sd; /*!< The socket database */
httpd_uri_t **hd_calls; /*!< Registered URI handlers */
struct httpd_req hd_req; /*!< The current HTTPD request */
struct httpd_req_aux hd_req_aux; /*!< Additional data about the HTTPD request kept unexposed */
/* Array of registered error handler functions */
httpd_err_handler_func_t *err_handler_fns;
};
/******************* Group : Session Management ********************/
/** @name Session Management
* Functions related to HTTP session management
* @{
*/
/**
* @brief Retrieve a session by its descriptor
*
* @param[in] hd Server instance data
* @param[in] sockfd Socket FD
* @return pointer into the socket DB, or NULL if not found
*/
struct sock_db *httpd_sess_get(struct httpd_data *hd, int sockfd);
/**
* @brief Delete sessions whose FDs have became invalid.
* This is a recovery strategy e.g. after select() fails.
*
* @param[in] hd Server instance data
*/
void httpd_sess_delete_invalid(struct httpd_data *hd);
/**
* @brief Initializes an http session by resetting the sockets database.
*
* @param[in] hd Server instance data
*/
void httpd_sess_init(struct httpd_data *hd);
/**
* @brief Starts a new session for client requesting connection and adds
* it's descriptor to the socket database.
*
* @param[in] hd Server instance data
* @param[in] newfd Descriptor of the new client to be added to the session.
*
* @return
* - ESP_OK : on successfully queuing the work
* - ESP_FAIL : in case of control socket error while sending
*/
esp_err_t httpd_sess_new(struct httpd_data *hd, int newfd);
/**
* @brief Processes incoming HTTP requests
*
* @param[in] hd Server instance data
* @param[in] clifd Descriptor of the client from which data is to be received
*
* @return
* - ESP_OK : on successfully receiving, parsing and responding to a request
* - ESP_FAIL : in case of failure in any of the stages of processing
*/
esp_err_t httpd_sess_process(struct httpd_data *hd, int clifd);
/**
* @brief Remove client descriptor from the session / socket database
* and close the connection for this client.
*
* @note The returned descriptor should be used by httpd_sess_iterate()
* to continue the iteration correctly. This ensures that the
* iteration is not restarted abruptly which may cause reading from
* a socket which has been already processed and thus blocking
* the server loop until data appears on that socket.
*
* @param[in] hd Server instance data
* @param[in] clifd Descriptor of the client to be removed from the session.
*
* @return
* - +VE : Client descriptor preceding the one being deleted
* - -1 : No descriptor preceding the one being deleted
*/
int httpd_sess_delete(struct httpd_data *hd, int clifd);
/**
* @brief Free session context
*
* @param[in] ctx Pointer to session context
* @param[in] free_fn Free function to call on session context
*/
void httpd_sess_free_ctx(void *ctx, httpd_free_ctx_fn_t free_fn);
/**
* @brief Add descriptors present in the socket database to an fdset and
* update the value of maxfd which are needed by the select function
* for looking through all available sockets for incoming data.
*
* @param[in] hd Server instance data
* @param[out] fdset File descriptor set to be updated.
* @param[out] maxfd Maximum value among all file descriptors.
*/
void httpd_sess_set_descriptors(struct httpd_data *hd, fd_set *fdset, int *maxfd);
/**
* @brief Iterates through the list of client fds in the session /socket database.
* Passing the value of a client fd returns the fd for the next client
* in the database. In order to iterate from the beginning pass -1 as fd.
*
* @param[in] hd Server instance data
* @param[in] fd Last accessed client descriptor.
* -1 to reset iterator to start of database.
*
* @return
* - +VE : Client descriptor next in the database
* - -1 : End of iteration
*/
int httpd_sess_iterate(struct httpd_data *hd, int fd);
/**
* @brief Checks if session can accept another connection from new client.
* If sockets database is full then this returns false.
*
* @param[in] hd Server instance data
*
* @return True if session can accept new clients
*/
bool httpd_is_sess_available(struct httpd_data *hd);
/**
* @brief Checks if session has any pending data/packets
* for processing
*
* This is needed as httpd_unrecv may un-receive next
* packet in the stream. If only partial packet was
* received then select() would mark the fd for processing
* as remaining part of the packet would still be in socket
* recv queue. But if a complete packet got unreceived
* then it would not be processed until further data is
* received on the socket. This is when this function
* comes in use, as it checks the socket's pending data
* buffer.
*
* @param[in] hd Server instance data
* @param[in] fd Client descriptor
*
* @return True if there is any pending data
*/
bool httpd_sess_pending(struct httpd_data *hd, int fd);
/**
* @brief Removes the least recently used client from the session
*
* This may be useful if new clients are requesting for connection but
* max number of connections is reached, in which case the client which
* is inactive for the longest will be removed from the session.
*
* @param[in] hd Server instance data
*
* @return
* - ESP_OK : if session closure initiated successfully
* - ESP_FAIL : if failed
*/
esp_err_t httpd_sess_close_lru(struct httpd_data *hd);
/** End of Group : Session Management
* @}
*/
/****************** Group : URI Handling ********************/
/** @name URI Handling
* Methods for accessing URI handlers
* @{
*/
/**
* @brief For an HTTP request, searches through all the registered URI handlers
* and invokes the appropriate one if found
*
* @param[in] hd Server instance data for which handler needs to be invoked
*
* @return
* - ESP_OK : if handler found and executed successfully
* - ESP_FAIL : otherwise
*/
esp_err_t httpd_uri(struct httpd_data *hd);
/**
* @brief Unregister all URI handlers
*
* @param[in] hd Server instance data
*/
void httpd_unregister_all_uri_handlers(struct httpd_data *hd);
/**
* @brief Validates the request to prevent users from calling APIs, that are to
* be called only inside a URI handler, outside the handler context
*
* @param[in] req Pointer to HTTP request that needs to be validated
*
* @return
* - true : if valid request
* - false : otherwise
*/
bool httpd_validate_req_ptr(httpd_req_t *r);
/* httpd_validate_req_ptr() adds some overhead to frequently used APIs,
* and is useful mostly for debugging, so it's preferable to disable
* the check by default and enable it only if necessary */
#ifdef CONFIG_HTTPD_VALIDATE_REQ
#define httpd_valid_req(r) httpd_validate_req_ptr(r)
#else
#define httpd_valid_req(r) true
#endif
/** End of Group : URI Handling
* @}
*/
/****************** Group : Processing ********************/
/** @name Processing
* Methods for processing HTTP requests
* @{
*/
/**
* @brief Initiates the processing of HTTP request
*
* Receives incoming TCP packet on a socket, then parses the packet as
* HTTP request and fills httpd_req_t data structure with the extracted
* URI, headers are ready to be fetched from scratch buffer and calling
* http_recv() after this reads the body of the request.
*
* @param[in] hd Server instance data
* @param[in] sd Pointer to socket which is needed for receiving TCP packets.
*
* @return
* - ESP_OK : if request packet is valid
* - ESP_FAIL : otherwise
*/
esp_err_t httpd_req_new(struct httpd_data *hd, struct sock_db *sd);
/**
* @brief For an HTTP request, resets the resources allocated for it and
* purges any data left to be received
*
* @param[in] hd Server instance data
*
* @return
* - ESP_OK : if request packet deleted and resources cleaned.
* - ESP_FAIL : otherwise.
*/
esp_err_t httpd_req_delete(struct httpd_data *hd);
/**
* @brief For handling HTTP errors by invoking registered
* error handler function
*
* @param[in] req Pointer to the HTTP request for which error occurred
* @param[in] error Error type
*
* @return
* - ESP_OK : error handled successful
* - ESP_FAIL : failure indicates that the underlying socket needs to be closed
*/
esp_err_t httpd_req_handle_err(httpd_req_t *req, httpd_err_code_t error);
/** End of Group : Parsing
* @}
*/
/****************** Group : Send/Receive ********************/
/** @name Send and Receive
* Methods for transmitting and receiving HTTP requests and responses
* @{
*/
/**
* @brief For sending out data in response to an HTTP request.
*
* @param[in] req Pointer to the HTTP request for which the response needs to be sent
* @param[in] buf Pointer to the buffer from where the body of the response is taken
* @param[in] buf_len Length of the buffer
*
* @return
* - Length of data : if successful
* - ESP_FAIL : if failed
*/
int httpd_send(httpd_req_t *req, const char *buf, size_t buf_len);
/**
* @brief For receiving HTTP request data
*
* @note The exposed API httpd_recv() is simply this function with last parameter
* set as false. This function is used internally during reception and
* processing of a new request. The option to halt after receiving pending
* data prevents the server from requesting more data than is needed for
* completing a packet in case when all the remaining part of the packet is
* in the pending buffer.
*
* @param[in] req Pointer to new HTTP request which only has the socket descriptor
* @param[out] buf Pointer to the buffer which will be filled with the received data
* @param[in] buf_len Length of the buffer
* @param[in] halt_after_pending When set true, halts immediately after receiving from
* pending buffer
*
* @return
* - Length of data : if successful
* - ESP_FAIL : if failed
*/
int httpd_recv_with_opt(httpd_req_t *r, char *buf, size_t buf_len, bool halt_after_pending);
/**
* @brief For un-receiving HTTP request data
*
* This function copies data into internal buffer pending_data so that
* when httpd_recv is called, it first fetches this pending data and
* then only starts receiving from the socket
*
* @note If data is too large for the internal buffer then only
* part of the data is unreceived, reflected in the returned
* length. Make sure that such truncation is checked for and
* handled properly.
*
* @param[in] req Pointer to new HTTP request which only has the socket descriptor
* @param[in] buf Pointer to the buffer from where data needs to be un-received
* @param[in] buf_len Length of the buffer
*
* @return Length of data copied into pending buffer
*/
size_t httpd_unrecv(struct httpd_req *r, const char *buf, size_t buf_len);
/**
* @brief This is the low level default send function of the HTTPD. This should
* NEVER be called directly. The semantics of this is exactly similar to
* send() of the BSD socket API.
*
* @param[in] hd Server instance data
* @param[in] sockfd Socket descriptor for sending data
* @param[in] buf Pointer to the buffer from where the body of the response is taken
* @param[in] buf_len Length of the buffer
* @param[in] flags Flags for mode selection
*
* @return
* - Length of data : if successful
* - -1 : if failed (appropriate errno is set)
*/
int httpd_default_send(httpd_handle_t hd, int sockfd, const char *buf, size_t buf_len, int flags);
/**
* @brief This is the low level default recv function of the HTTPD. This should
* NEVER be called directly. The semantics of this is exactly similar to
* recv() of the BSD socket API.
*
* @param[in] hd Server instance data
* @param[in] sockfd Socket descriptor for sending data
* @param[out] buf Pointer to the buffer which will be filled with the received data
* @param[in] buf_len Length of the buffer
* @param[in] flags Flags for mode selection
*
* @return
* - Length of data : if successful
* - -1 : if failed (appropriate errno is set)
*/
int httpd_default_recv(httpd_handle_t hd, int sockfd, char *buf, size_t buf_len, int flags);
/** End of Group : Send and Receive
* @}
*/
/* ************** Group: WebSocket ************** */
/** @name WebSocket
* Functions for WebSocket header parsing
* @{
*/
/**
* @brief This function is for responding a WebSocket handshake
*
* @param[in] req Pointer to handshake request that will be handled
* @return
* - ESP_OK : When handshake is sucessful
* - ESP_ERR_NOT_FOUND : When some headers (Sec-WebSocket-*) are not found
* - ESP_ERR_INVALID_VERSION : The WebSocket version is not "13"
* - ESP_ERR_INVALID_STATE : Handshake was done beforehand
* - ESP_ERR_INVALID_ARG : Argument is invalid (null or non-WebSocket)
* - ESP_FAIL : Socket failures
*/
esp_err_t httpd_ws_respond_server_handshake(httpd_req_t *req);
/**
* @brief This function is for getting a frame type
* and responding a WebSocket control frame automatically
*
* @param[in] req Pointer to handshake request that will be handled
* @return
* - ESP_OK : When handshake is sucessful
* - ESP_ERR_INVALID_ARG : Argument is invalid (null or non-WebSocket)
* - ESP_ERR_INVALID_STATE : Received only some parts of a control frame
* - ESP_FAIL : Socket failures
*/
esp_err_t httpd_ws_get_frame_type(httpd_req_t *req);
/** End of WebSocket related functions
* @}
*/
#ifdef __cplusplus
}
#endif
#endif /* ! _HTTPD_PRIV_H_ */
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