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1530 lines
48 KiB
C
1530 lines
48 KiB
C
/*
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* Copyright (c) 2001-2003 Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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/* This httpd supports for a
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* rudimentary server-side-include facility which will replace tags of the form
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* <!--#tag--> in any file whose extension is .shtml, .shtm or .ssi with
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* strings provided by an include handler whose pointer is provided to the
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* module via function http_set_ssi_handler().
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* Additionally, a simple common
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* gateway interface (CGI) handling mechanism has been added to allow clients
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* to hook functions to particular request URIs.
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*
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* To enable SSI support, define label LWIP_HTTPD_SSI in lwipopts.h.
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* To enable CGI support, define label LWIP_HTTPD_CGI in lwipopts.h.
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*
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* By default, the server assumes that HTTP headers are already present in
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* each file stored in the file system. By defining LWIP_HTTPD_DYNAMIC_HEADERS in
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* lwipopts.h, this behavior can be changed such that the server inserts the
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* headers automatically based on the extension of the file being served. If
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* this mode is used, be careful to ensure that the file system image used
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* does not already contain the header information.
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*
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* File system images without headers can be created using the makefsfile
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* tool with the -h command line option.
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*
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*
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* Notes about valid SSI tags
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* --------------------------
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*
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* The following assumptions are made about tags used in SSI markers:
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*
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* 1. No tag may contain '-' or whitespace characters within the tag name.
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* 2. Whitespace is allowed between the tag leadin "<!--#" and the start of
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* the tag name and between the tag name and the leadout string "-->".
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* 3. The maximum tag name length is LWIP_HTTPD_MAX_TAG_NAME_LEN, currently 8 characters.
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*
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* Notes on CGI usage
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* ------------------
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*
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* The simple CGI support offered here works with GET method requests only
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* and can handle up to 16 parameters encoded into the URI. The handler
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* function may not write directly to the HTTP output but must return a
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* filename that the HTTP server will send to the browser as a response to
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* the incoming CGI request.
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*
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* @todo:
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* - don't use mem_malloc()
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* - use pbuf_strstr() where applicable
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* - support the request coming in in chained pbufs or multiple packets
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* - support POST! - to receive larger amounts of data (e.g. firmware update)
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* - replace sprintf() by using other calls
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* - split too long functions into multiple smaller functions
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* - implement 501 - not implemented page
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* - support more file types?
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* - review the code in terms of "lw"... -> for pure static pages, it should be as tiny as before...
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*/
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#include "lwip/debug.h"
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#include "lwip/stats.h"
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#include "httpd.h"
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#include "httpd_structs.h"
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#include "lwip/tcp.h"
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#include "fs.h"
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#include <string.h>
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#ifndef HTTPD_DEBUG
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#define HTTPD_DEBUG LWIP_DBG_OFF
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#endif
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/** Set this to 1 and add the next line to lwippools.h to use a memp pool
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* for allocating struct http_state instead of the heap:
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*
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* LWIP_MEMPOOL(HTTPD_STATE, 20, 100, "HTTPD_STATE")
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*/
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#ifndef HTTPD_USE_MEM_POOL
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#define HTTPD_USE_MEM_POOL 0
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#endif
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/** The server port for HTTPD to use */
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#ifndef HTTPD_SERVER_PORT
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#define HTTPD_SERVER_PORT 80
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#endif
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/** Maximum retries before the connection is aborted/closed.
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* - number of times pcb->poll is called -> default is 4*500ms = 2s;
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* - reset when pcb->sent is called
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*/
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#ifndef HTTPD_MAX_RETRIES
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#define HTTPD_MAX_RETRIES 4
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#endif
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/** The poll delay is X*500ms */
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#ifndef HTTPD_POLL_INTERVAL
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#define HTTPD_POLL_INTERVAL 4
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#endif
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/** Priority for tcp pcbs created by HTTPD (very low by default).
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* Lower priorities get killed first when running out of memroy.
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*/
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#ifndef HTTPD_TCP_PRIO
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#define HTTPD_TCP_PRIO TCP_PRIO_MIN
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#endif
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/** Set this to 1 to enabled timing each file sent */
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#ifndef LWIP_HTTPD_TIMING
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#define LWIP_HTTPD_TIMING 0
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#endif
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#ifndef HTTPD_DEBUG_TIMING
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#define HTTPD_DEBUG_TIMING LWIP_DBG_OFF
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#endif
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#ifndef true
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#define true ((u8_t)1)
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#endif
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#ifndef false
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#define false ((u8_t)0)
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#endif
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/** This checks whether tcp_write has to copy data or not */
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#ifndef HTTP_IS_DATA_VOLATILE
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/** This was TI's check whether to let TCP copy data or not
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#define HTTP_IS_DATA_VOLATILE(hs) ((hs->file < (char *)0x20000000) ? 0 : TCP_WRITE_FLAG_COPY)*/
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#if LWIP_HTTPD_SSI
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#define HTTP_IS_DATA_VOLATILE(hs) TCP_WRITE_FLAG_COPY
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#else /* LWIP_HTTPD_SSI */
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/** Default: don't copy if the data is sent from file-system directly */
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#define HTTP_IS_DATA_VOLATILE(hs) (((hs->file != NULL) && (hs->handle != NULL) && (hs->file == \
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(char*)hs->handle->data + hs->handle->len - hs->left)) \
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? 0 : TCP_WRITE_FLAG_COPY)
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#endif /* LWIP_HTTPD_SSI */
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#endif
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typedef struct
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{
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const char *name;
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u8_t shtml;
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} default_filename;
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const default_filename g_psDefaultFilenames[] = {
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{"/index.shtml", true },
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{"/index.ssi", true },
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{"/index.shtm", true },
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{"/index.html", false },
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{"/index.htm", false }
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};
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#define NUM_DEFAULT_FILENAMES (sizeof(g_psDefaultFilenames) / \
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sizeof(default_filename))
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#if LWIP_HTTPD_DYNAMIC_HEADERS
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/* The number of individual strings that comprise the headers sent before each
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* requested file.
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*/
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#define NUM_FILE_HDR_STRINGS 3
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#endif /* LWIP_HTTPD_DYNAMIC_HEADERS */
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#if LWIP_HTTPD_SSI
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const char *g_pcSSIExtensions[] = {
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".shtml", ".shtm", ".ssi", ".xml"
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};
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#define NUM_SHTML_EXTENSIONS (sizeof(g_pcSSIExtensions) / sizeof(const char *))
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enum tag_check_state {
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TAG_NONE, /* Not processing an SSI tag */
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TAG_LEADIN, /* Tag lead in "<!--#" being processed */
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TAG_FOUND, /* Tag name being read, looking for lead-out start */
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TAG_LEADOUT, /* Tag lead out "-->" being processed */
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TAG_SENDING /* Sending tag replacement string */
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};
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#endif /* LWIP_HTTPD_SSI */
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struct http_state {
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struct fs_file *handle;
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char *file; /* Pointer to first unsent byte in buf. */
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#if LWIP_HTTPD_SSI || LWIP_HTTPD_DYNAMIC_HEADERS
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char *buf; /* File read buffer. */
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int buf_len; /* Size of file read buffer, buf. */
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#endif /* LWIP_HTTPD_SSI || LWIP_HTTPD_DYNAMIC_HEADERS */
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u32_t left; /* Number of unsent bytes in buf. */
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u8_t retries;
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#if LWIP_HTTPD_SSI
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const char *parsed; /* Pointer to the first unparsed byte in buf. */
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const char *tag_end; /* Pointer to char after the closing '>' of the tag. */
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u32_t parse_left; /* Number of unparsed bytes in buf. */
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u8_t tag_check; /* true if we are processing a .shtml file else false */
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u16_t tag_index; /* Counter used by tag parsing state machine */
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u16_t tag_insert_len; /* Length of insert in string tag_insert */
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u8_t tag_name_len; /* Length of the tag name in string tag_name */
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char tag_name[LWIP_HTTPD_MAX_TAG_NAME_LEN + 1]; /* Last tag name extracted */
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char tag_insert[LWIP_HTTPD_MAX_TAG_INSERT_LEN + 1]; /* Insert string for tag_name */
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enum tag_check_state tag_state; /* State of the tag processor */
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#endif /* LWIP_HTTPD_SSI */
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#if LWIP_HTTPD_CGI
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char *params[LWIP_HTTPD_MAX_CGI_PARAMETERS]; /* Params extracted from the request URI */
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char *param_vals[LWIP_HTTPD_MAX_CGI_PARAMETERS]; /* Values for each extracted param */
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#endif /* LWIP_HTTPD_CGI */
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#if LWIP_HTTPD_DYNAMIC_HEADERS
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const char *hdrs[NUM_FILE_HDR_STRINGS]; /* HTTP headers to be sent. */
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u16_t hdr_pos; /* The position of the first unsent header byte in the
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current string */
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u16_t hdr_index; /* The index of the hdr string currently being sent. */
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#endif /* LWIP_HTTPD_DYNAMIC_HEADERS */
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#if LWIP_HTTPD_TIMING
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u32_t time_started;
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#endif /* LWIP_HTTPD_TIMING */
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};
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#if LWIP_HTTPD_SSI
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/* SSI insert handler function pointer. */
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tSSIHandler g_pfnSSIHandler = NULL;
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int g_iNumTags = 0;
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const char **g_ppcTags = NULL;
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#define LEN_TAG_LEAD_IN 5
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const char * const g_pcTagLeadIn = "<!--#";
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#define LEN_TAG_LEAD_OUT 3
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const char * const g_pcTagLeadOut = "-->";
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#endif /* LWIP_HTTPD_SSI */
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#if LWIP_HTTPD_CGI
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/* CGI handler information */
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const tCGI *g_pCGIs = NULL;
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int g_iNumCGIs = 0;
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#endif /* LWIP_HTTPD_CGI */
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/** Allocate a struct http_state. */
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static struct http_state*
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http_state_alloc()
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{
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struct http_state *ret;
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#if HTTPD_USE_MEM_POOL
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ret = (struct http_state *)memp_malloc(MEMP_HTTPD_STATE);
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#else /* HTTPD_USE_MEM_POOL */
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ret = (struct http_state *)mem_malloc(sizeof(struct http_state));
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#endif /* HTTPD_USE_MEM_POOL */
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if (ret != NULL) {
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/* Initialize the structure. */
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memset(ret, 0, sizeof(struct http_state));
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#if LWIP_HTTPD_DYNAMIC_HEADERS
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/* Indicate that the headers are not yet valid */
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ret->hdr_index = NUM_FILE_HDR_STRINGS;
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#endif /* LWIP_HTTPD_DYNAMIC_HEADERS */
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}
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return ret;
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}
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/** Free a struct http_state.
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* Also frees the file data if dynamic.
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*/
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static void
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http_state_free(struct http_state *hs)
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{
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if (hs != NULL) {
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if(hs->handle) {
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#if LWIP_HTTPD_TIMING
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u32_t ms_needed = sys_now() - hs->time_started;
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u32_t needed = LWIP_MAX(1, (ms_needed/100));
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LWIP_DEBUGF(HTTPD_DEBUG_TIMING, ("httpd: needed %"U32_F" ms to send file of %d bytes -> %"U32_F" bytes/sec\n",
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ms_needed, hs->handle->len, ((((u32_t)hs->handle->len) * 10) / needed)));
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#endif /* LWIP_HTTPD_TIMING */
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fs_close(hs->handle);
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hs->handle = NULL;
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}
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#if LWIP_HTTPD_SSI || LWIP_HTTPD_DYNAMIC_HEADERS
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if (hs->buf != NULL) {
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mem_free(hs->buf);
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hs->buf = NULL;
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}
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#endif /* LWIP_HTTPD_SSI || LWIP_HTTPD_DYNAMIC_HEADERS */
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#if HTTPD_USE_MEM_POOL
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memp_free(MEMP_HTTPD_STATE, hs);
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#else /* HTTPD_USE_MEM_POOL */
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mem_free(hs);
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#endif /* HTTPD_USE_MEM_POOL */
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}
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}
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/**
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* The connection shall be actively closed.
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* Reset the sent- and recv-callbacks.
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*
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* @param pcb the tcp pcb to reset callbacks
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* @param hs connection state to free
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*/
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static void
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http_close_conn(struct tcp_pcb *pcb, struct http_state *hs)
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{
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err_t err;
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LWIP_DEBUGF(HTTPD_DEBUG, ("Closing connection %p\n", (void*)pcb));
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tcp_arg(pcb, NULL);
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tcp_sent(pcb, NULL);
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tcp_recv(pcb, NULL);
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http_state_free(hs);
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err = tcp_close(pcb);
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if (err != ERR_OK) {
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LWIP_DEBUGF(HTTPD_DEBUG, ("Error %d closing %p\n", err, (void*)pcb));
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}
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}
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#if LWIP_HTTPD_CGI
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/**
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* Extract URI parameters from the parameter-part of an URI in the form
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* "test.cgi?x=y" @todo: better explanation!
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* Pointers to the parameters are stored in hs->param_vals.
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*
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* @param hs http connection state
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* @param params pointer to the NULL-terminated parameter string from the URI
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* @return number of parameters extracted
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*/
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static int
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extract_uri_parameters(struct http_state *hs, char *params)
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{
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char *pair;
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char *equals;
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int loop;
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/* If we have no parameters at all, return immediately. */
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if(!params || (params[0] == '\0')) {
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return(0);
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}
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/* Get a pointer to our first parameter */
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pair = params;
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/*
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* Parse up to LWIP_HTTPD_MAX_CGI_PARAMETERS from the passed string and ignore the
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* remainder (if any)
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*/
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for(loop = 0; (loop < LWIP_HTTPD_MAX_CGI_PARAMETERS) && pair; loop++) {
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/* Save the name of the parameter */
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hs->params[loop] = pair;
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/* Remember the start of this name=value pair */
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equals = pair;
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/* Find the start of the next name=value pair and replace the delimiter
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* with a 0 to terminate the previous pair string.
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*/
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pair = strchr(pair, '&');
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if(pair) {
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*pair = '\0';
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pair++;
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} else {
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/* We didn't find a new parameter so find the end of the URI and
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* replace the space with a '\0'
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*/
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pair = strchr(equals, ' ');
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if(pair) {
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*pair = '\0';
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}
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/* Revert to NULL so that we exit the loop as expected. */
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pair = NULL;
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}
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/* Now find the '=' in the previous pair, replace it with '\0' and save
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* the parameter value string.
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*/
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equals = strchr(equals, '=');
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if(equals) {
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*equals = '\0';
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hs->param_vals[loop] = equals + 1;
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} else {
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hs->param_vals[loop] = NULL;
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}
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}
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return loop;
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}
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#endif /* LWIP_HTTPD_CGI */
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#if LWIP_HTTPD_SSI
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/**
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* Insert a tag (found in an shtml in the form of "<!--#tagname-->" into the file.
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* The tag's name is stored in hs->tag_name (NULL-terminated), the replacement
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* should be written to hs->tag_insert (up to a length of LWIP_HTTPD_MAX_TAG_INSERT_LEN).
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* The amount of data written is stored to hs->tag_insert_len.
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*
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* @todo: return tag_insert_len - maybe it can be removed from struct http_state?
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*
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* @param hs http connection state
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*/
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static void
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get_tag_insert(struct http_state *hs)
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{
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int loop;
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size_t len;
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if(g_pfnSSIHandler && g_ppcTags && g_iNumTags) {
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/* Find this tag in the list we have been provided. */
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for(loop = 0; loop < g_iNumTags; loop++) {
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if(strcmp(hs->tag_name, g_ppcTags[loop]) == 0) {
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hs->tag_insert_len = g_pfnSSIHandler(loop, hs->tag_insert,
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LWIP_HTTPD_MAX_TAG_INSERT_LEN);
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return;
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}
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}
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}
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/* If we drop out, we were asked to serve a page which contains tags that
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* we don't have a handler for. Merely echo back the tags with an error
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* marker.
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*
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* @todo: replace with multiple calls to strcat() or memcpy()
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*/
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/*u*/snprintf(hs->tag_insert, (LWIP_HTTPD_MAX_TAG_INSERT_LEN + 1),
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"<b>***UNKNOWN TAG %s***</b>", hs->tag_name);
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len = strlen(hs->tag_insert);
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LWIP_ASSERT("len <= 0xffff", len <= 0xffff);
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hs->tag_insert_len = (u16_t)len;
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}
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#endif /* LWIP_HTTPD_SSI */
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#if LWIP_HTTPD_DYNAMIC_HEADERS
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/**
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* Generate the relevant HTTP headers for the given filename and write
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* them into the supplied buffer. Returns true on success or false on failure.
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* @todo: this returns void, not true or false!
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*/
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static void
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get_http_headers(struct http_state *pState, char *pszURI)
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{
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int iLoop;
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char *pszWork;
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char *pszExt;
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|
char *pszVars;
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|
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/* Ensure that we initialize the loop counter. */
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iLoop = 0;
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|
|
/* In all cases, the second header we send is the server identification
|
|
so set it here. */
|
|
pState->hdrs[1] = g_psHTTPHeaderStrings[HTTP_HDR_SERVER];
|
|
|
|
/* Is this a normal file or the special case we use to send back the
|
|
default "404: Page not found" response? */
|
|
if(pszURI == NULL) {
|
|
pState->hdrs[0] = g_psHTTPHeaderStrings[HTTP_HDR_NOT_FOUND];
|
|
pState->hdrs[2] = g_psHTTPHeaderStrings[DEFAULT_404_HTML];
|
|
|
|
/* Set up to send the first header string. */
|
|
pState->hdr_index = 0;
|
|
pState->hdr_pos = 0;
|
|
return;
|
|
} else {
|
|
/* We are dealing with a particular filename. Look for one other
|
|
special case. We assume that any filename with "404" in it must be
|
|
indicative of a 404 server error whereas all other files require
|
|
the 200 OK header. */
|
|
if(strstr(pszURI, "404")) {
|
|
pState->hdrs[0] = g_psHTTPHeaderStrings[HTTP_HDR_NOT_FOUND];
|
|
} else {
|
|
pState->hdrs[0] = g_psHTTPHeaderStrings[HTTP_HDR_OK];
|
|
}
|
|
|
|
/* Determine if the URI has any variables and, if so, temporarily remove
|
|
them. */
|
|
pszVars = strchr(pszURI, '?');
|
|
if(pszVars) {
|
|
*pszVars = '\0';
|
|
}
|
|
|
|
/* Get a pointer to the file extension. We find this by looking for the
|
|
last occurrence of "." in the filename passed. */
|
|
pszExt = NULL;
|
|
pszWork = strchr(pszURI, '.');
|
|
while(pszWork) {
|
|
pszExt = pszWork + 1;
|
|
pszWork = strchr(pszExt, '.');
|
|
}
|
|
|
|
/* Now determine the content type and add the relevant header for that. */
|
|
for(iLoop = 0; (iLoop < NUM_HTTP_HEADERS) && pszExt; iLoop++) {
|
|
/* Have we found a matching extension? */
|
|
if(!strcmp(g_psHTTPHeaders[iLoop].extension, pszExt)) {
|
|
pState->hdrs[2] =
|
|
g_psHTTPHeaderStrings[g_psHTTPHeaders[iLoop].headerIndex];
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Reinstate the parameter marker if there was one in the original URI. */
|
|
if(pszVars) {
|
|
*pszVars = '?';
|
|
}
|
|
}
|
|
|
|
/* Does the URL passed have any file extension? If not, we assume it
|
|
is a special-case URL used for control state notification and we do
|
|
not send any HTTP headers with the response. */
|
|
if(!pszExt) {
|
|
/* Force the header index to a value indicating that all headers
|
|
have already been sent. */
|
|
pState->hdr_index = NUM_FILE_HDR_STRINGS;
|
|
}
|
|
else
|
|
{
|
|
/* Did we find a matching extension? */
|
|
if(iLoop == NUM_HTTP_HEADERS) {
|
|
/* No - use the default, plain text file type. */
|
|
pState->hdrs[2] = g_psHTTPHeaderStrings[HTTP_HDR_DEFAULT_TYPE];
|
|
}
|
|
|
|
/* Set up to send the first header string. */
|
|
pState->hdr_index = 0;
|
|
pState->hdr_pos = 0;
|
|
}
|
|
}
|
|
#endif /* LWIP_HTTPD_DYNAMIC_HEADERS */
|
|
|
|
/**
|
|
* Try to send more data on this pcb.
|
|
*
|
|
* @param pcb the pcb to send data
|
|
* @param hs connection state
|
|
*/
|
|
static u8_t
|
|
http_send_data(struct tcp_pcb *pcb, struct http_state *hs)
|
|
{
|
|
err_t err;
|
|
u16_t len;
|
|
u16_t mss;
|
|
u8_t data_to_send = false;
|
|
#if LWIP_HTTPD_DYNAMIC_HEADERS
|
|
u16_t hdrlen, sendlen;
|
|
#endif /* LWIP_HTTPD_DYNAMIC_HEADERS */
|
|
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("http_send_data: pcb=%p hs=%p left=%d\n", (void*)pcb,
|
|
(void*)hs, hs != NULL ? hs->left : 0));
|
|
|
|
#if LWIP_HTTPD_DYNAMIC_HEADERS
|
|
/* If we were passed a NULL state structure pointer, ignore the call. */
|
|
if (hs == NULL) {
|
|
return 0;
|
|
}
|
|
|
|
/* Assume no error until we find otherwise */
|
|
err = ERR_OK;
|
|
|
|
/* Do we have any more header data to send for this file? */
|
|
if(hs->hdr_index < NUM_FILE_HDR_STRINGS)
|
|
{
|
|
/* How much data can we send? */
|
|
len = tcp_sndbuf(pcb);
|
|
sendlen = len;
|
|
|
|
while(len && (hs->hdr_index < NUM_FILE_HDR_STRINGS) && sendlen)
|
|
{
|
|
/* How much do we have to send from the current header? */
|
|
hdrlen = (u16_t)strlen(hs->hdrs[hs->hdr_index]);
|
|
|
|
/* How much of this can we send? */
|
|
sendlen = (len < (hdrlen - hs->hdr_pos)) ?
|
|
len : (hdrlen - hs->hdr_pos);
|
|
|
|
/* Send this amount of data or as much as we can given memory
|
|
* constraints. */
|
|
do {
|
|
err = tcp_write(pcb, (const void *)(hs->hdrs[hs->hdr_index] +
|
|
hs->hdr_pos), sendlen, 0);
|
|
if (err == ERR_MEM) {
|
|
sendlen /= 2;
|
|
}
|
|
else if (err == ERR_OK) {
|
|
/* Remember that we added some more data to be transmitted. */
|
|
data_to_send = true;
|
|
}
|
|
} while ((err == ERR_MEM) && sendlen);
|
|
|
|
/* Fix up the header position for the next time round. */
|
|
hs->hdr_pos += sendlen;
|
|
len -= sendlen;
|
|
|
|
/* Have we finished sending this string? */
|
|
if(hs->hdr_pos == hdrlen) {
|
|
/* Yes - move on to the next one */
|
|
hs->hdr_index++;
|
|
hs->hdr_pos = 0;
|
|
}
|
|
}
|
|
|
|
/* If we get here and there are still header bytes to send, we send
|
|
* the header information we just wrote immediately. If there are no
|
|
* more headers to send, but we do have file data to send, drop through
|
|
* to try to send some file data too.
|
|
*/
|
|
if((hs->hdr_index < NUM_FILE_HDR_STRINGS) || !hs->file) {
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("tcp_output\n"));
|
|
return 1;
|
|
}
|
|
}
|
|
#else /* LWIP_HTTPD_DYNAMIC_HEADERS */
|
|
/* Assume no error until we find otherwise */
|
|
err = ERR_OK;
|
|
#endif /* LWIP_HTTPD_DYNAMIC_HEADERS */
|
|
|
|
/* Have we run out of file data to send? If so, we need to read the next
|
|
* block from the file. */
|
|
if (hs->left == 0) {
|
|
#if LWIP_HTTPD_SSI || LWIP_HTTPD_DYNAMIC_HEADERS
|
|
int count;
|
|
#endif /* LWIP_HTTPD_SSI || LWIP_HTTPD_DYNAMIC_HEADERS */
|
|
|
|
/* Do we have a valid file handle? */
|
|
if (hs->handle == NULL) {
|
|
/* No - close the connection. */
|
|
http_close_conn(pcb, hs);
|
|
return 0;
|
|
}
|
|
if(fs_bytes_left(hs->handle) <= 0) {
|
|
/* We reached the end of the file so this request is done */
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("End of file.\n"));
|
|
http_close_conn(pcb, hs);
|
|
return 0;
|
|
}
|
|
#if LWIP_HTTPD_SSI || LWIP_HTTPD_DYNAMIC_HEADERS
|
|
/* Do we already have a send buffer allocated? */
|
|
if(hs->buf) {
|
|
/* Yes - get the length of the buffer */
|
|
count = hs->buf_len;
|
|
} else {
|
|
/* We don't have a send buffer so allocate one up to 2mss bytes long. */
|
|
count = 2 * tcp_mss(pcb);
|
|
do {
|
|
hs->buf = (char*)mem_malloc((mem_size_t)count);
|
|
if (hs->buf != NULL) {
|
|
hs->buf_len = count;
|
|
break;
|
|
}
|
|
count = count / 2;
|
|
} while (count > 100);
|
|
|
|
/* Did we get a send buffer? If not, return immediately. */
|
|
if (hs->buf == NULL) {
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("No buff\n"));
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Read a block of data from the file. */
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("Trying to read %d bytes.\n", count));
|
|
|
|
count = fs_read(hs->handle, hs->buf, count);
|
|
if(count < 0) {
|
|
/* We reached the end of the file so this request is done */
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("End of file.\n"));
|
|
http_close_conn(pcb, hs);
|
|
return 1;
|
|
}
|
|
|
|
/* Set up to send the block of data we just read */
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("Read %d bytes.\n", count));
|
|
hs->left = count;
|
|
hs->file = hs->buf;
|
|
#if LWIP_HTTPD_SSI
|
|
hs->parse_left = count;
|
|
hs->parsed = hs->buf;
|
|
#endif /* LWIP_HTTPD_SSI */
|
|
#else /* LWIP_HTTPD_SSI || LWIP_HTTPD_DYNAMIC_HEADERS */
|
|
LWIP_ASSERT("SSI and DYNAMIC_HEADERS turned off but eof not reached", 0);
|
|
#endif /* LWIP_HTTPD_SSI || LWIP_HTTPD_DYNAMIC_HEADERS */
|
|
}
|
|
|
|
#if LWIP_HTTPD_SSI
|
|
if(!hs->tag_check) {
|
|
#endif /* LWIP_HTTPD_SSI */
|
|
/* We are not processing an SHTML file so no tag checking is necessary.
|
|
* Just send the data as we received it from the file.
|
|
*/
|
|
|
|
/* We cannot send more data than space available in the send
|
|
buffer. */
|
|
if (tcp_sndbuf(pcb) < hs->left) {
|
|
len = tcp_sndbuf(pcb);
|
|
} else {
|
|
len = (u16_t)hs->left;
|
|
LWIP_ASSERT("hs->left did not fit into u16_t!", (len == hs->left));
|
|
}
|
|
mss = tcp_mss(pcb);
|
|
if(len > (2 * mss)) {
|
|
len = 2 * mss;
|
|
}
|
|
|
|
do {
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("Sending %d bytes\n", len));
|
|
|
|
/* If the data is being read from a buffer in RAM, we need to copy it
|
|
* into the PCB. If it's in flash, however, we can avoid the copy since
|
|
* the data is obviously not going to be overwritten during the life
|
|
* of the connection.
|
|
*/
|
|
err = tcp_write(pcb, hs->file, len, HTTP_IS_DATA_VOLATILE(hs));
|
|
if (err == ERR_MEM) {
|
|
len /= 2;
|
|
}
|
|
} while ((err == ERR_MEM) && (len > 1));
|
|
|
|
if (err == ERR_OK) {
|
|
data_to_send = true;
|
|
hs->file += len;
|
|
hs->left -= len;
|
|
}
|
|
#if LWIP_HTTPD_SSI
|
|
} else {
|
|
/* We are processing an SHTML file so need to scan for tags and replace
|
|
* them with insert strings. We need to be careful here since a tag may
|
|
* straddle the boundary of two blocks read from the file and we may also
|
|
* have to split the insert string between two tcp_write operations.
|
|
*/
|
|
|
|
/* How much data could we send? */
|
|
len = tcp_sndbuf(pcb);
|
|
|
|
/* Do we have remaining data to send before parsing more? */
|
|
if(hs->parsed > hs->file) {
|
|
/* We cannot send more data than space available in the send
|
|
buffer. */
|
|
if (tcp_sndbuf(pcb) < (hs->parsed - hs->file)) {
|
|
len = tcp_sndbuf(pcb);
|
|
} else {
|
|
LWIP_ASSERT("Data size does not fit into u16_t!",
|
|
(hs->parsed - hs->file) <= 0xffff);
|
|
len = (u16_t)(hs->parsed - hs->file);
|
|
}
|
|
mss = tcp_mss(pcb);
|
|
if(len > (2 * mss)) {
|
|
len = 2 * mss;
|
|
}
|
|
|
|
do {
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("Sending %d bytes\n", len));
|
|
err = tcp_write(pcb, hs->file, len, 0);
|
|
if (err == ERR_MEM) {
|
|
len /= 2;
|
|
}
|
|
} while (err == ERR_MEM && len > 1);
|
|
|
|
if (err == ERR_OK) {
|
|
data_to_send = true;
|
|
hs->file += len;
|
|
hs->left -= len;
|
|
}
|
|
|
|
/* If the send buffer is full, return now. */
|
|
if(tcp_sndbuf(pcb) == 0) {
|
|
return data_to_send;
|
|
}
|
|
}
|
|
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("State %d, %d left\n", hs->tag_state, hs->parse_left));
|
|
|
|
/* We have sent all the data that was already parsed so continue parsing
|
|
* the buffer contents looking for SSI tags.
|
|
*/
|
|
while((hs->parse_left) && (err == ERR_OK)) {
|
|
switch(hs->tag_state) {
|
|
case TAG_NONE:
|
|
/* We are not currently processing an SSI tag so scan for the
|
|
* start of the lead-in marker.
|
|
*/
|
|
if(*hs->parsed == g_pcTagLeadIn[0])
|
|
{
|
|
/* We found what could be the lead-in for a new tag so change
|
|
* state appropriately.
|
|
*/
|
|
hs->tag_state = TAG_LEADIN;
|
|
hs->tag_index = 1;
|
|
}
|
|
|
|
/* Move on to the next character in the buffer */
|
|
hs->parse_left--;
|
|
hs->parsed++;
|
|
break;
|
|
|
|
case TAG_LEADIN:
|
|
/* We are processing the lead-in marker, looking for the start of
|
|
* the tag name.
|
|
*/
|
|
|
|
/* Have we reached the end of the leadin? */
|
|
if(hs->tag_index == LEN_TAG_LEAD_IN) {
|
|
hs->tag_index = 0;
|
|
hs->tag_state = TAG_FOUND;
|
|
} else {
|
|
/* Have we found the next character we expect for the tag leadin?
|
|
*/
|
|
if(*hs->parsed == g_pcTagLeadIn[hs->tag_index]) {
|
|
/* Yes - move to the next one unless we have found the complete
|
|
* leadin, in which case we start looking for the tag itself
|
|
*/
|
|
hs->tag_index++;
|
|
} else {
|
|
/* We found an unexpected character so this is not a tag. Move
|
|
* back to idle state.
|
|
*/
|
|
hs->tag_state = TAG_NONE;
|
|
}
|
|
|
|
/* Move on to the next character in the buffer */
|
|
hs->parse_left--;
|
|
hs->parsed++;
|
|
}
|
|
break;
|
|
|
|
case TAG_FOUND:
|
|
/* We are reading the tag name, looking for the start of the
|
|
* lead-out marker and removing any whitespace found.
|
|
*/
|
|
|
|
/* Remove leading whitespace between the tag leading and the first
|
|
* tag name character.
|
|
*/
|
|
if((hs->tag_index == 0) && ((*hs->parsed == ' ') ||
|
|
(*hs->parsed == '\t') || (*hs->parsed == '\n') ||
|
|
(*hs->parsed == '\r')))
|
|
{
|
|
/* Move on to the next character in the buffer */
|
|
hs->parse_left--;
|
|
hs->parsed++;
|
|
break;
|
|
}
|
|
|
|
/* Have we found the end of the tag name? This is signalled by
|
|
* us finding the first leadout character or whitespace */
|
|
if((*hs->parsed == g_pcTagLeadOut[0]) ||
|
|
(*hs->parsed == ' ') || (*hs->parsed == '\t') ||
|
|
(*hs->parsed == '\n') || (*hs->parsed == '\r')) {
|
|
|
|
if(hs->tag_index == 0) {
|
|
/* We read a zero length tag so ignore it. */
|
|
hs->tag_state = TAG_NONE;
|
|
} else {
|
|
/* We read a non-empty tag so go ahead and look for the
|
|
* leadout string.
|
|
*/
|
|
hs->tag_state = TAG_LEADOUT;
|
|
LWIP_ASSERT("hs->tag_index <= 0xff", hs->tag_index <= 0xff);
|
|
hs->tag_name_len = (u8_t)hs->tag_index;
|
|
hs->tag_name[hs->tag_index] = '\0';
|
|
if(*hs->parsed == g_pcTagLeadOut[0]) {
|
|
hs->tag_index = 1;
|
|
} else {
|
|
hs->tag_index = 0;
|
|
}
|
|
}
|
|
} else {
|
|
/* This character is part of the tag name so save it */
|
|
if(hs->tag_index < LWIP_HTTPD_MAX_TAG_NAME_LEN) {
|
|
hs->tag_name[hs->tag_index++] = *hs->parsed;
|
|
} else {
|
|
/* The tag was too long so ignore it. */
|
|
hs->tag_state = TAG_NONE;
|
|
}
|
|
}
|
|
|
|
/* Move on to the next character in the buffer */
|
|
hs->parse_left--;
|
|
hs->parsed++;
|
|
|
|
break;
|
|
|
|
/*
|
|
* We are looking for the end of the lead-out marker.
|
|
*/
|
|
case TAG_LEADOUT:
|
|
/* Remove leading whitespace between the tag leading and the first
|
|
* tag leadout character.
|
|
*/
|
|
if((hs->tag_index == 0) && ((*hs->parsed == ' ') ||
|
|
(*hs->parsed == '\t') || (*hs->parsed == '\n') ||
|
|
(*hs->parsed == '\r')))
|
|
{
|
|
/* Move on to the next character in the buffer */
|
|
hs->parse_left--;
|
|
hs->parsed++;
|
|
break;
|
|
}
|
|
|
|
/* Have we found the next character we expect for the tag leadout?
|
|
*/
|
|
if(*hs->parsed == g_pcTagLeadOut[hs->tag_index]) {
|
|
/* Yes - move to the next one unless we have found the complete
|
|
* leadout, in which case we need to call the client to process
|
|
* the tag.
|
|
*/
|
|
|
|
/* Move on to the next character in the buffer */
|
|
hs->parse_left--;
|
|
hs->parsed++;
|
|
|
|
if(hs->tag_index == (LEN_TAG_LEAD_OUT - 1)) {
|
|
/* Call the client to ask for the insert string for the
|
|
* tag we just found.
|
|
*/
|
|
get_tag_insert(hs);
|
|
|
|
/* Next time through, we are going to be sending data
|
|
* immediately, either the end of the block we start
|
|
* sending here or the insert string.
|
|
*/
|
|
hs->tag_index = 0;
|
|
hs->tag_state = TAG_SENDING;
|
|
hs->tag_end = hs->parsed;
|
|
|
|
/* If there is any unsent data in the buffer prior to the
|
|
* tag, we need to send it now.
|
|
*/
|
|
if(hs->tag_end > hs->file)
|
|
{
|
|
/* How much of the data can we send? */
|
|
if(len > hs->tag_end - hs->file) {
|
|
len = (u16_t)(hs->tag_end - hs->file);
|
|
}
|
|
|
|
do {
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("Sending %d bytes\n", len));
|
|
err = tcp_write(pcb, hs->file, len, 0);
|
|
if (err == ERR_MEM) {
|
|
len /= 2;
|
|
}
|
|
} while (err == ERR_MEM && (len > 1));
|
|
|
|
if (err == ERR_OK) {
|
|
data_to_send = true;
|
|
hs->file += len;
|
|
hs->left -= len;
|
|
}
|
|
}
|
|
} else {
|
|
hs->tag_index++;
|
|
}
|
|
} else {
|
|
/* We found an unexpected character so this is not a tag. Move
|
|
* back to idle state.
|
|
*/
|
|
hs->parse_left--;
|
|
hs->parsed++;
|
|
hs->tag_state = TAG_NONE;
|
|
}
|
|
break;
|
|
|
|
/*
|
|
* We have found a valid tag and are in the process of sending
|
|
* data as a result of that discovery. We send either remaining data
|
|
* from the file prior to the insert point or the insert string itself.
|
|
*/
|
|
case TAG_SENDING:
|
|
/* Do we have any remaining file data to send from the buffer prior
|
|
* to the tag?
|
|
*/
|
|
if(hs->tag_end > hs->file)
|
|
{
|
|
/* How much of the data can we send? */
|
|
if(len > hs->tag_end - hs->file) {
|
|
len = (u16_t)(hs->tag_end - hs->file);
|
|
}
|
|
|
|
do {
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("Sending %d bytes\n", len));
|
|
err = tcp_write(pcb, hs->file, len, 0);
|
|
if (err == ERR_MEM) {
|
|
len /= 2;
|
|
}
|
|
} while (err == ERR_MEM && (len > 1));
|
|
|
|
if (err == ERR_OK) {
|
|
data_to_send = true;
|
|
hs->file += len;
|
|
hs->left -= len;
|
|
}
|
|
} else {
|
|
/* Do we still have insert data left to send? */
|
|
if(hs->tag_index < hs->tag_insert_len) {
|
|
/* We are sending the insert string itself. How much of the
|
|
* insert can we send? */
|
|
if(len > (hs->tag_insert_len - hs->tag_index)) {
|
|
len = (hs->tag_insert_len - hs->tag_index);
|
|
}
|
|
|
|
do {
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("Sending %d bytes\n", len));
|
|
/*
|
|
* Note that we set the copy flag here since we only have a
|
|
* single tag insert buffer per connection. If we don't do
|
|
* this, insert corruption can occur if more than one insert
|
|
* is processed before we call tcp_output.
|
|
*/
|
|
err = tcp_write(pcb, &(hs->tag_insert[hs->tag_index]), len, 1);
|
|
if (err == ERR_MEM) {
|
|
len /= 2;
|
|
}
|
|
} while (err == ERR_MEM && (len > 1));
|
|
|
|
if (err == ERR_OK) {
|
|
data_to_send = true;
|
|
hs->tag_index += len;
|
|
return 1;
|
|
}
|
|
} else {
|
|
/* We have sent all the insert data so go back to looking for
|
|
* a new tag.
|
|
*/
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("Everything sent.\n"));
|
|
hs->tag_index = 0;
|
|
hs->tag_state = TAG_NONE;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we drop out of the end of the for loop, this implies we must have
|
|
* file data to send so send it now. In TAG_SENDING state, we've already
|
|
* handled this so skip the send if that's the case.
|
|
*/
|
|
if((hs->tag_state != TAG_SENDING) && (hs->parsed > hs->file)) {
|
|
/* We cannot send more data than space available in the send
|
|
buffer. */
|
|
if (tcp_sndbuf(pcb) < (hs->parsed - hs->file)) {
|
|
len = tcp_sndbuf(pcb);
|
|
} else {
|
|
LWIP_ASSERT("Data size does not fit into u16_t!",
|
|
(hs->parsed - hs->file) <= 0xffff);
|
|
len = (u16_t)(hs->parsed - hs->file);
|
|
}
|
|
if(len > (2 * tcp_mss(pcb))) {
|
|
len = 2 * tcp_mss(pcb);
|
|
}
|
|
|
|
do {
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("Sending %d bytes\n", len));
|
|
err = tcp_write(pcb, hs->file, len, 0);
|
|
if (err == ERR_MEM) {
|
|
len /= 2;
|
|
}
|
|
} while (err == ERR_MEM && len > 1);
|
|
|
|
if (err == ERR_OK) {
|
|
data_to_send = true;
|
|
hs->file += len;
|
|
hs->left -= len;
|
|
}
|
|
}
|
|
}
|
|
#endif /* LWIP_HTTPD_SSI */
|
|
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("send_data end.\n"));
|
|
return data_to_send;
|
|
}
|
|
|
|
/**
|
|
* Get the file struct for a 404 error page.
|
|
* Tries some file names and returns NULL if none found.
|
|
*
|
|
* @param uri pointer that receives the actual file name URI
|
|
* @return file struct for the error page or NULL no matching file was found
|
|
*/
|
|
static struct fs_file *
|
|
http_get_404_file(char **uri)
|
|
{
|
|
struct fs_file *file;
|
|
|
|
*uri = "/404.html";
|
|
file = fs_open(*uri);
|
|
if(file == NULL) {
|
|
/* 404.html doesn't exist. Try 404.htm instead. */
|
|
*uri = "/404.htm";
|
|
file = fs_open(*uri);
|
|
if(file == NULL) {
|
|
/* 404.htm doesn't exist either. Indicate to the caller that it should
|
|
* send back a default 404 page.
|
|
*/
|
|
*uri = NULL;
|
|
}
|
|
}
|
|
|
|
return file;
|
|
}
|
|
|
|
/**
|
|
* When data has been received in the correct state, try to parse it
|
|
* as a HTTP request.
|
|
*
|
|
* @param p the received pbuf
|
|
* @param hs the connection state
|
|
* @return ERR_OK if request was OK and hs has been initialized correctly
|
|
* another err_t otherwise
|
|
*/
|
|
static err_t
|
|
http_parse_request(struct pbuf *p, struct http_state *hs)
|
|
{
|
|
int i;
|
|
/* default is request not supported, until it can be parsed */
|
|
err_t request_supported = ERR_ARG;
|
|
size_t loop;
|
|
char *data;
|
|
char *uri;
|
|
struct fs_file *file = NULL;
|
|
#if LWIP_HTTPD_CGI
|
|
int count;
|
|
char *params;
|
|
#endif /* LWIP_HTTPD_CGI */
|
|
|
|
data = (char*)p->payload;
|
|
/* @todo: using 'data' as string here is kind of unsafe... */
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("Request:\n%s\n", data));
|
|
/* @todo: support POST, check p->len, correctly handle multi-packet requests */
|
|
if (strncmp(data, "GET ", 4) == 0) {
|
|
/* GET is 3 characters plus one space */
|
|
uri = &data[4];
|
|
/*
|
|
* We have a GET request. Find the end of the URI by looking for the
|
|
* HTTP marker. We can't just use strstr to find this since the request
|
|
* came from an outside source and we can't be sure that it is
|
|
* correctly formed. We need to make sure that our search is bounded
|
|
* by the packet length so we do it manually. If we don't find " HTTP",
|
|
* assume the request is invalid and close the connection.
|
|
* @todo: use pbuf_strstr()
|
|
*/
|
|
for(i = 4; i <= (p->len - 5); i++) {
|
|
if ((data[i] == ' ') && (data[i + 1] == 'H') &&
|
|
(data[i + 2] == 'T') && (data[i + 3] == 'T') &&
|
|
(data[i + 4] == 'P')) {
|
|
/* this NULL-terminates the URI string */
|
|
data[i] = 0;
|
|
break;
|
|
}
|
|
}
|
|
if(i > (p->len - 5)) {
|
|
/* We failed to find " HTTP" in the request so assume it is invalid */
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("Invalid GET request. Closing.\n"));
|
|
return ERR_ARG;
|
|
}
|
|
|
|
#if LWIP_HTTPD_SSI
|
|
/*
|
|
* By default, assume we will not be processing server-side-includes
|
|
* tags
|
|
*/
|
|
hs->tag_check = false;
|
|
#endif /* LWIP_HTTPD_SSI */
|
|
|
|
/* Have we been asked for the default root file? */
|
|
if((uri[0] == '/') && (uri[1] == 0)) {
|
|
/* Try each of the configured default filenames until we find one
|
|
that exists. */
|
|
for (loop = 0; loop < NUM_DEFAULT_FILENAMES; loop++) {
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("Looking for %s...\n", g_psDefaultFilenames[loop].name));
|
|
file = fs_open((char *)g_psDefaultFilenames[loop].name);
|
|
uri = (char *)g_psDefaultFilenames[loop].name;
|
|
if(file != NULL) {
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("Opened.\n"));
|
|
#if LWIP_HTTPD_SSI
|
|
hs->tag_check = g_psDefaultFilenames[loop].shtml;
|
|
#endif /* LWIP_HTTPD_SSI */
|
|
break;
|
|
}
|
|
}
|
|
if (file == NULL) {
|
|
/* None of the default filenames exist so send back a 404 page */
|
|
file = http_get_404_file(&uri);
|
|
#if LWIP_HTTPD_SSI
|
|
hs->tag_check = false;
|
|
#endif /* LWIP_HTTPD_SSI */
|
|
}
|
|
} else {
|
|
/* No - we've been asked for a specific file. */
|
|
#if LWIP_HTTPD_CGI
|
|
/* First, isolate the base URI (without any parameters) */
|
|
params = strchr(uri, '?');
|
|
if (params != NULL) {
|
|
/* URI contains parameters. NULL-terminate the base URI */
|
|
*params = '\0';
|
|
params++;
|
|
}
|
|
|
|
/* Does the base URI we have isolated correspond to a CGI handler? */
|
|
if (g_iNumCGIs && g_pCGIs) {
|
|
for (i = 0; i < g_iNumCGIs; i++) {
|
|
if (strcmp(uri, g_pCGIs[i].pcCGIName) == 0) {
|
|
/*
|
|
* We found a CGI that handles this URI so extract the
|
|
* parameters and call the handler.
|
|
*/
|
|
count = extract_uri_parameters(hs, params);
|
|
uri = g_pCGIs[i].pfnCGIHandler(i, count, hs->params,
|
|
hs->param_vals);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Did we handle this URL as a CGI? If not, reinstate the
|
|
* original URL and pass it to the file system directly. */
|
|
if (i == g_iNumCGIs) {
|
|
/* Replace the ? marker at the beginning of the parameters */
|
|
if (params != NULL) {
|
|
params--;
|
|
*params = '?';
|
|
}
|
|
}
|
|
}
|
|
#endif /* LWIP_HTTPD_CGI */
|
|
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("Opening %s\n", uri));
|
|
|
|
file = fs_open(uri);
|
|
if (file == NULL) {
|
|
file = http_get_404_file(&uri);
|
|
}
|
|
#if LWIP_HTTPD_SSI
|
|
else {
|
|
/*
|
|
* See if we have been asked for an shtml file and, if so,
|
|
* enable tag checking.
|
|
*/
|
|
hs->tag_check = false;
|
|
for (loop = 0; loop < NUM_SHTML_EXTENSIONS; loop++) {
|
|
if (strstr(uri, g_pcSSIExtensions[loop])) {
|
|
hs->tag_check = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
#endif /* LWIP_HTTPD_SSI */
|
|
}
|
|
|
|
if (file != NULL) {
|
|
/* file opened, initialise struct http_state */
|
|
#if LWIP_HTTPD_SSI
|
|
hs->tag_index = 0;
|
|
hs->tag_state = TAG_NONE;
|
|
hs->parsed = file->data;
|
|
hs->parse_left = file->len;
|
|
hs->tag_end = file->data;
|
|
#endif /* LWIP_HTTPD_SSI */
|
|
hs->handle = file;
|
|
hs->file = (char*)file->data;
|
|
LWIP_ASSERT("File length must be positive!", (file->len >= 0));
|
|
hs->left = file->len;
|
|
hs->retries = 0;
|
|
request_supported = ERR_OK;
|
|
#if LWIP_HTTPD_TIMING
|
|
hs->time_started = sys_now();
|
|
#endif /* LWIP_HTTPD_TIMING */
|
|
} else {
|
|
hs->handle = NULL;
|
|
hs->file = NULL;
|
|
hs->left = 0;
|
|
hs->retries = 0;
|
|
}
|
|
|
|
#if LWIP_HTTPD_DYNAMIC_HEADERS
|
|
/* Determine the HTTP headers to send based on the file extension of
|
|
* the requested URI. */
|
|
if (!hs->handle->http_header_included) {
|
|
get_http_headers(hs, uri);
|
|
}
|
|
#endif /* LWIP_HTTPD_DYNAMIC_HEADERS */
|
|
} else {
|
|
/* @todo: return HTTP error 501 */
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("Invalid request/not implemented. Closing.\n"));
|
|
}
|
|
return request_supported;
|
|
}
|
|
|
|
/**
|
|
* The pcb had an error and is already deallocated.
|
|
* The argument might still be valid (if != NULL).
|
|
*/
|
|
static void
|
|
http_err(void *arg, err_t err)
|
|
{
|
|
struct http_state *hs = (struct http_state *)arg;
|
|
LWIP_UNUSED_ARG(err);
|
|
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("http_err: %s", lwip_strerr(err)));
|
|
|
|
if (hs != NULL) {
|
|
http_state_free(hs);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Data has been sent and acknowledged by the remote host.
|
|
* This means that more data can be sent.
|
|
*/
|
|
static err_t
|
|
http_sent(void *arg, struct tcp_pcb *pcb, u16_t len)
|
|
{
|
|
struct http_state *hs = (struct http_state *)arg;
|
|
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("http_sent %p\n", (void*)pcb));
|
|
|
|
LWIP_UNUSED_ARG(len);
|
|
|
|
if (hs == NULL) {
|
|
return ERR_OK;
|
|
}
|
|
|
|
hs->retries = 0;
|
|
|
|
http_send_data(pcb, hs);
|
|
|
|
return ERR_OK;
|
|
}
|
|
|
|
/**
|
|
* The poll function is called every 2nd second.
|
|
* If there has been no data sent (which resets the retries) in 8 seconds, close.
|
|
* If the last portion of a file has not been sent in 2 seconds, close.
|
|
*
|
|
* This could be increased, but we don't want to waste resources for bad connections.
|
|
*/
|
|
static err_t
|
|
http_poll(void *arg, struct tcp_pcb *pcb)
|
|
{
|
|
struct http_state *hs = (struct http_state *)arg;
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("http_poll: pcb=%p hs=%p pcb_state=%s\n",
|
|
(void*)pcb, (void*)hs, tcp_debug_state_str(pcb->state)));
|
|
|
|
if (hs == NULL) {
|
|
if (pcb->state == ESTABLISHED) {
|
|
/* arg is null, close. */
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("http_poll: arg is NULL, close\n"));
|
|
http_close_conn(pcb, hs);
|
|
return ERR_OK;
|
|
}
|
|
} else {
|
|
hs->retries++;
|
|
if (hs->retries == HTTPD_MAX_RETRIES) {
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("http_poll: too many retries, close\n"));
|
|
http_close_conn(pcb, hs);
|
|
return ERR_OK;
|
|
}
|
|
|
|
/* If this connection has a file open, try to send some more data. If
|
|
* it has not yet received a GET request, don't do this since it will
|
|
* cause the connection to close immediately. */
|
|
if(hs && (hs->handle)) {
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("http_poll: try to send more data\n"));
|
|
if(http_send_data(pcb, hs)) {
|
|
/* If we wrote anything to be sent, go ahead and send it now. */
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("tcp_output\n"));
|
|
tcp_output(pcb);
|
|
}
|
|
}
|
|
}
|
|
|
|
return ERR_OK;
|
|
}
|
|
|
|
/**
|
|
* Data has been received on this pcb.
|
|
* For HTTP 1.0, this should normally only happen once (if the request fits in one packet).
|
|
*/
|
|
static err_t
|
|
http_recv(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
|
|
{
|
|
err_t parsed = ERR_ABRT;
|
|
struct http_state *hs = (struct http_state *)arg;
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("http_recv: pcb=%p pbuf=%p err=%s\n", (void*)pcb,
|
|
(void*)p, lwip_strerr(err)));
|
|
|
|
if (p != NULL) {
|
|
/* Inform TCP that we have taken the data. */
|
|
tcp_recved(pcb, p->tot_len);
|
|
}
|
|
if ((err != ERR_OK) || (p == NULL) || (hs == NULL)) {
|
|
/* error or closed by other side? */
|
|
if (p != NULL) {
|
|
pbuf_free(p);
|
|
}
|
|
if (hs == NULL) {
|
|
/* this should not happen, only to be robust */
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("Error, http_recv: hs is NULL, abort\n"));
|
|
}
|
|
http_close_conn(pcb, hs);
|
|
return ERR_OK;
|
|
}
|
|
|
|
if (hs->handle == NULL) {
|
|
parsed = http_parse_request(p, hs);
|
|
} else {
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("http_recv: already sending data\n"));
|
|
}
|
|
pbuf_free(p);
|
|
if (parsed == ERR_OK) {
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("http_recv: data %p len %"S32_F"\n", hs->file, hs->left));
|
|
http_send_data(pcb, hs);
|
|
} else if (parsed == ERR_ABRT) {
|
|
http_close_conn(pcb, hs);
|
|
}
|
|
return ERR_OK;
|
|
}
|
|
|
|
/**
|
|
* A new incoming connection has been accepted.
|
|
*/
|
|
static err_t
|
|
http_accept(void *arg, struct tcp_pcb *pcb, err_t err)
|
|
{
|
|
struct http_state *hs;
|
|
struct tcp_pcb_listen *lpcb = (struct tcp_pcb_listen*)arg;
|
|
LWIP_UNUSED_ARG(err);
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("http_accept %p / %p\n", (void*)pcb, arg));
|
|
|
|
/* Decrease the listen backlog counter */
|
|
tcp_accepted(lpcb);
|
|
/* Set priority */
|
|
tcp_setprio(pcb, HTTPD_TCP_PRIO);
|
|
|
|
/* Allocate memory for the structure that holds the state of the
|
|
connection - initialized by that function. */
|
|
hs = http_state_alloc();
|
|
if (hs == NULL) {
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("http_accept: Out of memory, RST\n"));
|
|
return ERR_MEM;
|
|
}
|
|
|
|
/* Tell TCP that this is the structure we wish to be passed for our
|
|
callbacks. */
|
|
tcp_arg(pcb, hs);
|
|
|
|
/* Set up the various callback functions */
|
|
tcp_recv(pcb, http_recv);
|
|
tcp_err(pcb, http_err);
|
|
tcp_poll(pcb, http_poll, HTTPD_POLL_INTERVAL);
|
|
tcp_sent(pcb, http_sent);
|
|
|
|
return ERR_OK;
|
|
}
|
|
|
|
/**
|
|
* Initialize the httpd: set up a listening PCB and bind it to the defined port
|
|
*/
|
|
void
|
|
httpd_init(void)
|
|
{
|
|
struct tcp_pcb *pcb;
|
|
err_t err;
|
|
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("httpd_init\n"));
|
|
|
|
pcb = tcp_new();
|
|
LWIP_ASSERT("httpd_init: tcp_new failed", pcb != NULL);
|
|
err = tcp_bind(pcb, IP_ADDR_ANY, HTTPD_SERVER_PORT);
|
|
LWIP_ASSERT("httpd_init: tcp_bind failed", err == ERR_OK);
|
|
pcb = tcp_listen(pcb);
|
|
LWIP_ASSERT("httpd_init: tcp_listen failed", pcb != NULL);
|
|
/* initialize callback arg and accept callback */
|
|
tcp_arg(pcb, pcb);
|
|
tcp_accept(pcb, http_accept);
|
|
}
|
|
|
|
#if LWIP_HTTPD_SSI
|
|
/**
|
|
* Set the SSI handler function.
|
|
*
|
|
* @param ssi_handler the SSI handler function
|
|
* @param tags an array of SSI tag strings to search for in SSI-enabled files
|
|
* @param num_tags number of tags in the 'tags' array
|
|
*/
|
|
void
|
|
http_set_ssi_handler(tSSIHandler ssi_handler, const char **tags, int num_tags)
|
|
{
|
|
LWIP_DEBUGF(HTTPD_DEBUG, ("http_set_ssi_handler\n"));
|
|
|
|
LWIP_ASSERT("no ssi_handler given", ssi_handler != NULL);
|
|
LWIP_ASSERT("no tags given", tags != NULL);
|
|
LWIP_ASSERT("invalid number of tags", num_tags > 0);
|
|
|
|
g_pfnSSIHandler = ssi_handler;
|
|
g_ppcTags = tags;
|
|
g_iNumTags = num_tags;
|
|
}
|
|
#endif /* LWIP_HTTPD_SSI */
|
|
|
|
#if LWIP_HTTPD_CGI
|
|
/**
|
|
* Set an array of CGI filenames/handler functions
|
|
*
|
|
* @param cgis an array of CGI filenames/handler functions
|
|
* @param num_handlers number of elements in the 'cgis' array
|
|
*/
|
|
void
|
|
http_set_cgi_handlers(const tCGI *cgis, int num_handlers)
|
|
{
|
|
LWIP_ASSERT("no cgis given", cgis != NULL);
|
|
LWIP_ASSERT("invalid number of handlers", num_handlers > 0);
|
|
|
|
g_pCGIs = cgis;
|
|
g_iNumCGIs = num_handlers;
|
|
}
|
|
#endif /* LWIP_HTTPD_CGI */
|