FreeRTOS-RISCV/FreeRTOSv10.2.1/FreeRTOS/Demo/Common/ethernet/FreeTCPIP/apps/httpd/httpd.c

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/**
* \addtogroup apps
* @{
*/
/**
* \defgroup httpd Web server
* @{
* The uIP web server is a very simplistic implementation of an HTTP
* server. It can serve web pages and files from a read-only ROM
* filesystem, and provides a very small scripting language.
*/
/**
* \file
* Web server
* \author
* Adam Dunkels <adam@sics.se>
*/
/*
* Copyright (c) 2004, Adam Dunkels.
* 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. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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 uIP TCP/IP stack.
*
* Author: Adam Dunkels <adam@sics.se>
*
* $Id: httpd.c,v 1.2 2006/06/11 21:46:38 adam Exp $
*/
#include "net/uip.h"
#include "apps/httpd/httpd.h"
#include "apps/httpd/httpd-fs.h"
#include "apps/httpd/httpd-cgi.h"
#include "apps/httpd/http-strings.h"
#include <string.h>
#define STATE_WAITING 0
#define STATE_OUTPUT 1
#define ISO_nl 0x0a
#define ISO_space 0x20
#define ISO_bang 0x21
#define ISO_percent 0x25
#define ISO_period 0x2e
#define ISO_slash 0x2f
#define ISO_colon 0x3a
/*---------------------------------------------------------------------------*/
static unsigned short generate_part_of_file( void *state )
{
struct httpd_state *s = ( struct httpd_state * ) state;
if( s->file.len > uip_mss() )
{
s->len = uip_mss();
}
else
{
s->len = s->file.len;
}
memcpy( uip_appdata, s->file.data, s->len );
return s->len;
}
/*---------------------------------------------------------------------------*/
static PT_THREAD( send_file ( struct httpd_state *s ) )
{
PSOCK_BEGIN( &s->sout );
( void ) PT_YIELD_FLAG;
do
{
PSOCK_GENERATOR_SEND( &s->sout, generate_part_of_file, s );
s->file.len -= s->len;
s->file.data += s->len;
} while( s->file.len > 0 );
PSOCK_END( &s->sout );
}
/*---------------------------------------------------------------------------*/
static PT_THREAD( send_part_of_file ( struct httpd_state *s ) )
{
PSOCK_BEGIN( &s->sout );
( void ) PT_YIELD_FLAG;
PSOCK_SEND( &s->sout, s->file.data, s->len );
PSOCK_END( &s->sout );
}
/*---------------------------------------------------------------------------*/
static void next_scriptstate( struct httpd_state *s )
{
char *p;
p = strchr( s->scriptptr, ISO_nl ) + 1;
s->scriptlen -= ( unsigned short ) ( p - s->scriptptr );
s->scriptptr = p;
}
/*---------------------------------------------------------------------------*/
static PT_THREAD( handle_script ( struct httpd_state *s ) )
{
char *ptr;
PT_BEGIN( &s->scriptpt );
( void ) PT_YIELD_FLAG;
while( s->file.len > 0 )
{
/* Check if we should start executing a script. */
if( *s->file.data == ISO_percent && *(s->file.data + 1) == ISO_bang )
{
s->scriptptr = s->file.data + 3;
s->scriptlen = s->file.len - 3;
if( *(s->scriptptr - 1) == ISO_colon )
{
httpd_fs_open( s->scriptptr + 1, &s->file );
PT_WAIT_THREAD( &s->scriptpt, send_file(s) );
}
else
{
PT_WAIT_THREAD( &s->scriptpt, httpd_cgi(s->scriptptr) (s, s->scriptptr) );
}
next_scriptstate( s );
/* The script is over, so we reset the pointers and continue
sending the rest of the file. */
s->file.data = s->scriptptr;
s->file.len = s->scriptlen;
}
else
{
/* See if we find the start of script marker in the block of HTML
to be sent. */
if( s->file.len > uip_mss() )
{
s->len = uip_mss();
}
else
{
s->len = s->file.len;
}
if( *s->file.data == ISO_percent )
{
ptr = strchr( s->file.data + 1, ISO_percent );
}
else
{
ptr = strchr( s->file.data, ISO_percent );
}
if( ptr != NULL && ptr != s->file.data )
{
s->len = ( int ) ( ptr - s->file.data );
if( s->len >= uip_mss() )
{
s->len = uip_mss();
}
}
PT_WAIT_THREAD( &s->scriptpt, send_part_of_file(s) );
s->file.data += s->len;
s->file.len -= s->len;
}
}
PT_END( &s->scriptpt );
}
/*---------------------------------------------------------------------------*/
static PT_THREAD( send_headers ( struct httpd_state *s, const char *statushdr ) )
{
char *ptr;
PSOCK_BEGIN( &s->sout );
( void ) PT_YIELD_FLAG;
PSOCK_SEND_STR( &s->sout, statushdr );
ptr = strrchr( s->filename, ISO_period );
if( ptr == NULL )
{
PSOCK_SEND_STR( &s->sout, http_content_type_binary );
}
else if( strncmp(http_html, ptr, 5) == 0 || strncmp(http_shtml, ptr, 6) == 0 )
{
PSOCK_SEND_STR( &s->sout, http_content_type_html );
}
else if( strncmp(http_css, ptr, 4) == 0 )
{
PSOCK_SEND_STR( &s->sout, http_content_type_css );
}
else if( strncmp(http_png, ptr, 4) == 0 )
{
PSOCK_SEND_STR( &s->sout, http_content_type_png );
}
else if( strncmp(http_gif, ptr, 4) == 0 )
{
PSOCK_SEND_STR( &s->sout, http_content_type_gif );
}
else if( strncmp(http_jpg, ptr, 4) == 0 )
{
PSOCK_SEND_STR( &s->sout, http_content_type_jpg );
}
else
{
PSOCK_SEND_STR( &s->sout, http_content_type_plain );
}
PSOCK_END( &s->sout );
}
/*---------------------------------------------------------------------------*/
static PT_THREAD( handle_output ( struct httpd_state *s ) )
{
char *ptr;
PT_BEGIN( &s->outputpt );
( void ) PT_YIELD_FLAG;
if( !httpd_fs_open(s->filename, &s->file) )
{
httpd_fs_open( http_404_html, &s->file );
strcpy( s->filename, http_404_html );
PT_WAIT_THREAD( &s->outputpt, send_headers(s, http_header_404) );
PT_WAIT_THREAD( &s->outputpt, send_file(s) );
}
else
{
PT_WAIT_THREAD( &s->outputpt, send_headers(s, http_header_200) );
ptr = strchr( s->filename, ISO_period );
if( ptr != NULL && strncmp(ptr, http_shtml, 6) == 0 )
{
PT_INIT( &s->scriptpt );
PT_WAIT_THREAD( &s->outputpt, handle_script(s) );
}
else
{
PT_WAIT_THREAD( &s->outputpt, send_file(s) );
}
}
PSOCK_CLOSE( &s->sout );
PT_END( &s->outputpt );
}
/*---------------------------------------------------------------------------*/
static PT_THREAD( handle_input ( struct httpd_state *s ) )
{
PSOCK_BEGIN( &s->sin );
( void ) PT_YIELD_FLAG;
PSOCK_READTO( &s->sin, ISO_space );
if( strncmp(s->inputbuf, http_get, 4) != 0 )
{
PSOCK_CLOSE_EXIT( &s->sin );
}
PSOCK_READTO( &s->sin, ISO_space );
if( s->inputbuf[0] != ISO_slash )
{
PSOCK_CLOSE_EXIT( &s->sin );
}
if( s->inputbuf[1] == ISO_space )
{
strncpy( s->filename, http_index_html, sizeof(s->filename) );
}
else
{
s->inputbuf[PSOCK_DATALEN( &s->sin ) - 1] = 0;
/* Process any form input being sent to the server. */
#if UIP_CONF_PROCESS_HTTPD_FORMS == 1
{
extern void vApplicationProcessFormInput( char *pcInputString );
vApplicationProcessFormInput( s->inputbuf );
}
#endif
strncpy( s->filename, &s->inputbuf[0], sizeof(s->filename) );
}
/* httpd_log_file(uip_conn->ripaddr, s->filename);*/
s->state = STATE_OUTPUT;
while( 1 )
{
PSOCK_READTO( &s->sin, ISO_nl );
if( strncmp(s->inputbuf, http_referer, 8) == 0 )
{
s->inputbuf[PSOCK_DATALEN( &s->sin ) - 2] = 0;
/* httpd_log(&s->inputbuf[9]);*/
}
}
PSOCK_END( &s->sin );
}
/*---------------------------------------------------------------------------*/
static void handle_connection( struct httpd_state *s )
{
handle_input( s );
if( s->state == STATE_OUTPUT )
{
handle_output( s );
}
}
/*---------------------------------------------------------------------------*/
void httpd_appcall( void )
{
struct httpd_state *s = ( struct httpd_state * ) &( uip_conn->appstate );
if( uip_closed() || uip_aborted() || uip_timedout() )
{
}
else if( uip_connected() )
{
PSOCK_INIT( &s->sin, s->inputbuf, sizeof(s->inputbuf) - 1 );
PSOCK_INIT( &s->sout, s->inputbuf, sizeof(s->inputbuf) - 1 );
PT_INIT( &s->outputpt );
s->state = STATE_WAITING;
/* timer_set(&s->timer, CLOCK_SECOND * 100);*/
s->timer = 0;
handle_connection( s );
}
else if( s != NULL )
{
if( uip_poll() )
{
++s->timer;
if( s->timer >= 20 )
{
uip_abort();
}
}
else
{
s->timer = 0;
}
handle_connection( s );
}
else
{
uip_abort();
}
}
/*---------------------------------------------------------------------------*/
/**
* \brief Initialize the web server
*
* This function initializes the web server and should be
* called at system boot-up.
*/
void httpd_init( void )
{
uip_listen( HTONS(80) );
}
/*---------------------------------------------------------------------------*/
/** @} */