493 lines
17 KiB
C
493 lines
17 KiB
C
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// Copyright 2018 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef _HTTPD_PRIV_H_
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#define _HTTPD_PRIV_H_
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#include <stdbool.h>
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#include <sys/socket.h>
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#include <sys/param.h>
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#include <netinet/in.h>
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#include <esp_log.h>
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#include <esp_err.h>
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#include <http_server.h>
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#include "osal.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Size of request data block/chunk (not to be confused with chunked encoded data)
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* that is received and parsed in one turn of the parsing process. This should not
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* exceed the scratch buffer size and should atleast be 8 bytes */
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#define PARSER_BLOCK_SIZE 128
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/* Calculate the maximum size needed for the scratch buffer */
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#define HTTPD_SCRATCH_BUF MAX(HTTPD_MAX_REQ_HDR_LEN, HTTPD_MAX_URI_LEN)
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/* Formats a log string to prepend context function name */
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#define LOG_FMT(x) "%s: " x, __func__
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/**
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* @brief Thread related data for internal use
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*/
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struct thread_data {
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othread_t handle; /*!< Handle to thread/task */
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enum {
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THREAD_IDLE = 0,
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THREAD_RUNNING,
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THREAD_STOPPING,
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THREAD_STOPPED,
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} status; /*!< State of the thread */
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};
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/**
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* @brief Error codes sent by server in case of errors
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* encountered during processing of an HTTP request
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*/
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typedef enum {
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/* For any unexpected errors during parsing, like unexpected
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* state transitions, or unhandled errors.
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*/
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HTTPD_500_SERVER_ERROR = 0,
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/* For methods not supported by http_parser. Presently
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* http_parser halts parsing when such methods are
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* encountered and so the server responds with 400 Bad
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* Request error instead.
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*/
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HTTPD_501_METHOD_NOT_IMPLEMENTED,
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/* When HTTP version is not 1.1 */
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HTTPD_505_VERSION_NOT_SUPPORTED,
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/* Returned when http_parser halts parsing due to incorrect
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* syntax of request, unsupported method in request URI or
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* due to chunked encoding option present in headers
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*/
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HTTPD_400_BAD_REQUEST,
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/* When requested URI is not found */
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HTTPD_404_NOT_FOUND,
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/* When URI found, but method has no handler registered */
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HTTPD_405_METHOD_NOT_ALLOWED,
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/* Intended for recv timeout. Presently it's being sent
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* for other recv errors as well. Client should expect the
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* server to immediatly close the connection after
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* responding with this.
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*/
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HTTPD_408_REQ_TIMEOUT,
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/* Intended for responding to chunked encoding, which is
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* not supported currently. Though unhandled http_parser
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* callback for chunked request returns "400 Bad Request"
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*/
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HTTPD_411_LENGTH_REQUIRED,
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/* URI length greater than HTTPD_MAX_URI_LEN */
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HTTPD_414_URI_TOO_LONG,
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/* Headers section larger thn HTTPD_MAX_REQ_HDR_LEN */
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HTTPD_431_REQ_HDR_FIELDS_TOO_LARGE,
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/* There is no particular HTTP error code for not supporting
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* upgrade. For this respond with 200 OK. Client expects status
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* code 101 if upgrade were supported, so 200 should be fine.
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*/
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HTTPD_XXX_UPGRADE_NOT_SUPPORTED
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} httpd_err_resp_t;
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/**
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* @brief A database of all the open sockets in the system.
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*/
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struct sock_db {
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int fd; /*!< The file descriptor for this socket */
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void *ctx; /*!< A custom context for this socket */
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httpd_handle_t handle; /*!< Server handle */
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httpd_free_sess_ctx_fn_t free_ctx; /*!< Function for freeing the context */
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httpd_send_func_t send_fn; /*!< Send function for this socket */
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httpd_recv_func_t recv_fn; /*!< Send function for this socket */
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int64_t timestamp; /*!< Timestamp indicating when the socket was last used */
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char pending_data[PARSER_BLOCK_SIZE]; /*!< Buffer for pending data to be received */
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size_t pending_len; /*!< Length of pending data to be received */
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};
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/**
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* @brief Auxilary data structure for use during reception and processing
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* of requests and temporarily keeping responses
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*/
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struct httpd_req_aux {
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struct sock_db *sd; /*!< Pointer to socket database */
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char scratch[HTTPD_SCRATCH_BUF + 1]; /*!< Temporary buffer for our operations (1 byte extra for null termination) */
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size_t remaining_len; /*!< Amount of data remaining to be fetched */
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char *status; /*!< HTTP response's status code */
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char *content_type; /*!< HTTP response's content type */
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bool first_chunk_sent; /*!< Used to indicate if first chunk sent */
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unsigned req_hdrs_count; /*!< Count of total headers in request packet */
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unsigned resp_hdrs_count; /*!< Count of additional headers in response packet */
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struct resp_hdr {
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const char *field;
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const char *value;
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} *resp_hdrs; /*!< Additional headers in response packet */
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struct http_parser_url url_parse_res; /*!< URL parsing result, used for retrieving URL elements */
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};
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/**
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* @brief Server data for each instance. This is exposed publicaly as
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* httpd_handle_t but internal structure/members are kept private.
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*/
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struct httpd_data {
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httpd_config_t config; /*!< HTTPD server configuration */
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int listen_fd; /*!< Server listener FD */
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int ctrl_fd; /*!< Ctrl message receiver FD */
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int msg_fd; /*!< Ctrl message sender FD */
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struct thread_data hd_td; /*!< Information for the HTTPd thread */
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struct sock_db *hd_sd; /*!< The socket database */
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httpd_uri_t **hd_calls; /*!< Registered URI handlers */
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struct httpd_req hd_req; /*!< The current HTTPD request */
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struct httpd_req_aux hd_req_aux; /*!< Additional data about the HTTPD request kept unexposed */
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};
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/******************* Group : Session Management ********************/
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/** @name Session Management
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* Functions related to HTTP session management
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* @{
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*/
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/**
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* @brief Initializes an http session by resetting the sockets database.
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*
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* @param[in] hd Server instance data
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*/
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void httpd_sess_init(struct httpd_data *hd);
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/**
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* @brief Starts a new session for client requesting connection and adds
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* it's descriptor to the socket database.
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*
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* @param[in] hd Server instance data
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* @param[in] newfd Descriptor of the new client to be added to the session.
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*
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* @return
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* - ESP_OK : on successfully queueing the work
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* - ESP_FAIL : in case of control socket error while sending
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*/
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esp_err_t httpd_sess_new(struct httpd_data *hd, int newfd);
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/**
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* @brief Processes incoming HTTP requests
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*
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* @param[in] hd Server instance data
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* @param[in] clifd Descriptor of the client from which data is to be received
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*
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* @return
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* - ESP_OK : on successfully receiving, parsing and responding to a request
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* - ESP_FAIL : in case of failure in any of the stages of processing
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*/
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esp_err_t httpd_sess_process(struct httpd_data *hd, int clifd);
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/**
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* @brief Remove client descriptor from the session / socket database
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* and close the connection for this client.
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*
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* @note The returned descriptor should be used by httpd_sess_iterate()
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* to continue the iteration correctly. This ensurs that the
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* iteration is not restarted abruptly which may cause reading from
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* a socket which has been already processed and thus blocking
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* the server loop until data appears on that socket.
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*
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* @param[in] hd Server instance data
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* @param[in] clifd Descriptor of the client to be removed from the session.
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*
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* @return
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* - +VE : Client descriptor preceding the one being deleted
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* - -1 : No descriptor preceding the one being deleted
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*/
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int httpd_sess_delete(struct httpd_data *hd, int clifd);
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/**
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* @brief Add descriptors present in the socket database to an fd_set and
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* update the value of maxfd which are needed by the select function
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* for looking through all available sockets for incoming data.
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*
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* @param[in] hd Server instance data
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* @param[out] fdset File descriptor set to be updated.
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* @param[out] maxfd Maximum value among all file descriptors.
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*/
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void httpd_sess_set_descriptors(struct httpd_data *hd, fd_set *fdset, int *maxfd);
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/**
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* @brief Iterates through the list of client fds in the session /socket database.
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* Passing the value of a client fd returns the fd for the next client
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* in the database. In order to iterate from the beginning pass -1 as fd.
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*
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* @param[in] hd Server instance data
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* @param[in] fd Last accessed client descriptor.
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* -1 to reset iterator to start of database.
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*
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* @return
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* - +VE : Client descriptor next in the database
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* - -1 : End of iteration
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*/
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int httpd_sess_iterate(struct httpd_data *hd, int fd);
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/**
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* @brief Checks if session can accept another connection from new client.
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* If sockets database is full then this returns false.
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*
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* @param[in] hd Server instance data
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*
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* @return True if session can accept new clients
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*/
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bool httpd_is_sess_available(struct httpd_data *hd);
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/**
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* @brief Checks if session has any pending data/packets
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* for processing
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*
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* This is needed as httpd_unrecv may unreceive next
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* packet in the stream. If only partial packet was
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* received then select() would mark the fd for processing
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* as remaining part of the packet would still be in socket
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* recv queue. But if a complete packet got unreceived
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* then it would not be processed until furtur data is
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* received on the socket. This is when this function
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* comes in use, as it checks the socket's pending data
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* buffer.
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*
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* @param[in] hd Server instance data
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* @param[in] fd Client descriptor
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*
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* @return True if there is any pending data
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*/
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bool httpd_sess_pending(struct httpd_data *hd, int fd);
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/**
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* @brief Removes the least recently used client from the session
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*
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* This may be useful if new clients are requesting for connection but
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* max number of connections is reached, in which case the client which
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* is inactive for the longest will be removed from the session.
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*
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* @param[in] hd Server instance data
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*
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* @return
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* - ESP_OK : if session closure initiated successfully
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* - ESP_FAIL : if failed
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*/
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esp_err_t httpd_sess_close_lru(struct httpd_data *hd);
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/** End of Group : Session Management
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* @}
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*/
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/****************** Group : URI Handling ********************/
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/** @name URI Handling
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* Methods for accessing URI handlers
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* @{
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*/
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/**
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* @brief For an HTTP request, searches through all the registered URI handlers
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* and invokes the appropriate one if found
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*
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* @param[in] hd Server instance data for which handler needs to be invoked
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*
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* @return
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* - ESP_OK : if handler found and executed successfully
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* - ESP_FAIL : otherwise
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*/
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esp_err_t httpd_uri(struct httpd_data *hd);
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/**
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* @brief Deregister all URI handlers
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*
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* @param[in] hd Server instance data
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*/
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void httpd_unregister_all_uri_handlers(struct httpd_data *hd);
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/**
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* @brief Validates the request to prevent users from calling APIs, that are to
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* be called only inside a URI handler, outside the handler context
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*
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* @param[in] req Pointer to HTTP request that neds to be validated
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*
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* @return
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* - true : if valid request
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* - false : otherwise
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*/
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bool httpd_valid_req(httpd_req_t *r);
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/** End of Group : URI Handling
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* @}
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*/
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/****************** Group : Processing ********************/
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/** @name Processing
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* Methods for processing HTTP requests
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* @{
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*/
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/**
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* @brief Initiates the processing of HTTP request
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*
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* Receives incoming TCP packet on a socket, then parses the packet as
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* HTTP request and fills httpd_req_t data structure with the extracted
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* URI, headers are ready to be fetched from scratch buffer and calling
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* http_recv() after this reads the body of the request.
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*
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* @param[in] hd Server instance data
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* @param[in] sd Pointer to socket which is needed for receiving TCP packets.
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*
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* @return
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* - ESP_OK : if request packet is valid
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* - ESP_FAIL : otherwise
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*/
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esp_err_t httpd_req_new(struct httpd_data *hd, struct sock_db *sd);
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/**
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* @brief For an HTTP request, resets the resources allocated for it and
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* purges any data left to be received
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*
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* @param[in] hd Server instance data
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*
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* @return
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* - ESP_OK : if request packet deleted and resources cleaned.
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* - ESP_FAIL : otherwise.
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*/
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esp_err_t httpd_req_delete(struct httpd_data *hd);
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/** End of Group : Parsing
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* @}
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*/
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/****************** Group : Send/Receive ********************/
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/** @name Send and Receive
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* Methods for transmitting and receiving HTTP requests and responses
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* @{
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*/
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/**
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* @brief For sending out error code in response to HTTP request.
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*
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* @param[in] req Pointer to the HTTP request for which the resonse needs to be sent
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* @param[in] error Error type to send
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*
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* @return
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* - ESP_OK : if successful
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* - ESP_FAIL : if failed
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*/
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esp_err_t httpd_resp_send_err(httpd_req_t *req, httpd_err_resp_t error);
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/**
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* @brief For sending out data in response to an HTTP request.
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*
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* @param[in] req Pointer to the HTTP request for which the resonse needs to be sent
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* @param[in] buf Pointer to the buffer from where the body of the response is taken
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* @param[in] buf_len Length of the buffer
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*
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* @return
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* - Length of data : if successful
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* - ESP_FAIL : if failed
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*/
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int httpd_send(httpd_req_t *req, const char *buf, size_t buf_len);
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/**
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* @brief For receiving HTTP request data
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*
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* @note The exposed API httpd_recv() is simply this function with last parameter
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* set as false. This function is used internally during reception and
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* processing of a new request. The option to halt after receiving pending
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* data prevents the server from requesting more data than is needed for
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* completing a packet in case when all the remaining part of the packet is
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* in the pending buffer.
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*
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* @param[in] req Pointer to new HTTP request which only has the socket descriptor
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* @param[out] buf Pointer to the buffer which will be filled with the received data
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* @param[in] buf_len Length of the buffer
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* @param[in] halt_after_pending When set true, halts immediatly after receiving from
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* pending buffer
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*
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* @return
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* - Length of data : if successful
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* - ESP_FAIL : if failed
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*/
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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] 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(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] 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(int sockfd, char *buf, size_t buf_len, int flags);
|
||
|
|
||
|
/** End of Group : Send and Receive
|
||
|
* @}
|
||
|
*/
|
||
|
|
||
|
#ifdef __cplusplus
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
#endif /* ! _HTTPD_PRIV_H_ */
|