webserver-master.rar_arduino_master_webserver

/* * Copyright (c) 2001-2003 Swedish Institute of Computer Science. * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY * OF SUCH DAMAGE. * * This file is part of the lwIP TCP/IP stack. * * Author: Adam Dunkels <[email protected]> * */ /* This httpd supports for a * rudimentary server-side-include facility which will replace tags of the form * <!--#tag--> in any file whose extension is .shtml, .shtm or .ssi with * strings provided by an include handler whose pointer is provided to the * module via function http_set_ssi_handler(). * Additionally, a simple common * gateway interface (CGI) handling mechanism has been added to allow clients * to hook functions to particular request URIs. * * To enable SSI support, define label LWIP_HTTPD_SSI in lwipopts.h. * To enable CGI support, define label LWIP_HTTPD_CGI in lwipopts.h. * * By default, the server assumes that HTTP headers are already present in * each file stored in the file system. By defining LWIP_HTTPD_DYNAMIC_HEADERS in * lwipopts.h, this behavior can be changed such that the server inserts the * headers automatically based on the extension of the file being served. If * this mode is used, be careful to ensure that the file system image used * does not already contain the header information. * * File system images without headers can be created using the makefsfile * tool with the -h command line option. * * * Notes about valid SSI tags * -------------------------- * * The following assumptions are made about tags used in SSI markers: * * 1. No tag may contain '-' or whitespace characters within the tag name. * 2. Whitespace is allowed between the tag leadin "<!--#" and the start of * the tag name and between the tag name and the leadout string "-->". * 3. The maximum tag name length is LWIP_HTTPD_MAX_TAG_NAME_LEN, currently 8 characters. * * Notes on CGI usage * ------------------ * * The simple CGI support offered here works with GET method requests only * and can handle up to 16 parameters encoded into the URI. The handler * function may not write directly to the HTTP output but must return a * filename that the HTTP server will send to the browser as a response to * the incoming CGI request. * * @todo: * - don't use mem_malloc() (for SSI/dynamic headers) * - split too long functions into multiple smaller functions? * - support more file types? */ #include "lwip/debug.h" #include "lwip/stats.h" #include "httpd.h" #include "httpd_structs.h" #include "lwip/tcp.h" #include "fs.h" #include <string.h> #include <stdlib.h> #if LWIP_TCP #ifndef HTTPD_DEBUG #define HTTPD_DEBUG LWIP_DBG_OFF #endif /** Set this to 1 and add the next line to lwippools.h to use a memp pool * for allocating struct http_state instead of the heap: * * LWIP_MEMPOOL(HTTPD_STATE, 20, 100, "HTTPD_STATE") */ #ifndef HTTPD_USE_MEM_POOL #define HTTPD_USE_MEM_POOL 0 #endif /** The server port for HTTPD to use */ #ifndef HTTPD_SERVER_PORT #define HTTPD_SERVER_PORT 80 #endif /** Maximum retries before the connection is aborted/closed. * - number of times pcb->poll is called -> default is 4*500ms = 2s; * - reset when pcb->sent is called */ #ifndef HTTPD_MAX_RETRIES #define HTTPD_MAX_RETRIES 4 #endif /** The poll delay is X*500ms */ #ifndef HTTPD_POLL_INTERVAL #define HTTPD_POLL_INTERVAL 4 #endif /** Priority for tcp pcbs created by HTTPD (very low by default). * Lower priorities get killed first when running out of memroy. */ #ifndef HTTPD_TCP_PRIO #define HTTPD_TCP_PRIO TCP_PRIO_MIN #endif /** Set this to 1 to enabled timing each file sent */ #ifndef LWIP_HTTPD_TIMING #define LWIP_HTTPD_TIMING 0 #endif #ifndef HTTPD_DEBUG_TIMING #define HTTPD_DEBUG_TIMING LWIP_DBG_OFF #endif /** Set this to 1 on platforms where strnstr is not available */ #ifndef LWIP_HTTPD_STRNSTR_PRIVATE #define LWIP_HTTPD_STRNSTR_PRIVATE 1 #endif /** Set this to one to show error pages when parsing a request fails instead of simply closing the connection. */ #ifndef LWIP_HTTPD_SUPPORT_EXTSTATUS #define LWIP_HTTPD_SUPPORT_EXTSTATUS 0 #endif /** Set this to 0 to drop support for HTTP/0.9 clients (to save some bytes) */ #ifndef LWIP_HTTPD_SUPPORT_V09 #define LWIP_HTTPD_SUPPORT_V09 1 #endif /** Set this to 1 to support HTTP request coming in in multiple packets/pbufs */ #ifndef LWIP_HTTPD_SUPPORT_REQUESTLIST #define LWIP_HTTPD_SUPPORT_REQUESTLIST 1 #endif #if LWIP_HTTPD_SUPPORT_REQUESTLIST /** Number of rx pbufs to enqueue to parse an incoming request (up to the first newline) */ #ifndef LWIP_HTTPD_REQ_QUEUELEN #define LWIP_HTTPD_REQ_QUEUELEN 10 #endif /** Number of (TCP payload-) bytes (in pbufs) to enqueue to parse and incoming request (up to the first double-newline) */ #ifndef LWIP_HTTPD_REQ_BUFSIZE #define LWIP_HTTPD_REQ_BUFSIZE LWIP_HTTPD_MAX_REQ_LENGTH #endif /** Defines the maximum length of a HTTP request line (up to the first CRLF, copied from pbuf into this a global buffer when pbuf- or packet-queues are received - otherwise the input pbuf is used directly) */ #ifndef LWIP_HTTPD_MAX_REQ_LENGTH #define LWIP_HTTPD_MAX_REQ_LENGTH 1023 #endif #endif /* LWIP_HTTPD_SUPPORT_REQUESTLIST */ /** Maximum length of the filename to send as response to a POST request, * filled in by the application when a POST is finished. */ #ifndef LWIP_HTTPD_POST_MAX_RESPONSE_URI_LEN #define LWIP_HTTPD_POST_MAX_RESPONSE_URI_LEN 63 #endif /** Set this to 0 to not send the SSI tag (default is on, so the tag will * be sent in the HTML page */ #ifndef LWIP_HTTPD_SSI_INCLUDE_TAG #define LWIP_HTTPD_SSI_INCLUDE_TAG 1 #endif #ifndef true #define true ((u8_t)1) #endif #ifndef false #define false ((u8_t)0) #endif /** Minimum length for a valid HTTP/0.9 request: "GET /\r\n" -> 7 bytes */ #define MIN_REQ_LEN 7 #define CRLF "\r\n" /** These defines check whether tcp_write has to copy data or not */ #ifndef HTTP_IS_DATA_VOLATILE #if LWIP_HTTPD_SSI /* Copy for SSI files, no copy for non-SSI files */ #define HTTP_IS_DATA_VOLATILE(hs) ((hs)->tag_check ? TCP_WRITE_FLAG_COPY : 0) #else /* LWIP_HTTPD_SSI */ /** Default: don't copy if the data is sent from file-system directly */ #define HTTP_IS_DATA_VOLATILE(hs) (((hs->file != NULL) && (hs->handle != NULL) && (hs->file == \ (char*)hs->handle->data + hs->handle->len - hs->left)) \ ? 0 : TCP_WRITE_FLAG_COPY) #endif /* LWIP_HTTPD_SSI */ #e