/*$T httpd.c GC 1.138 07/23/05 13:10:49 */
/*
* \addtogroup exampleapps @{ £
* \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. The
* script language is very simple and works as follows. Each script line starts
* with a command character, either "i", "t", "c", "#" or ".". The "i" command
* tells the script interpreter to "include" a file from the virtual file system
* and output it to the web browser. The "t" command should be followed by a line
* of text that is to be output to the browser. The "c" command is used to call
* one of the C functions from the httpd-cgi.c file. A line that starts with a "#"
* is ignored (i.e., the "#" denotes a comment), and the "." denotes the last
* script line. The script that produces the file statistics page looks somewhat
* like this: \code i /header.html t File statistics
i /footer.plain . \endcode £
* \file HTTP server. \author Adam Dunkels £
* Copyright (c) 2001, 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. 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 uIP TCP/IP stack. $Id: httpd.c,v 1.28.2.6 2003/10/07
* 13:22:27 adam Exp $
*/
#include "uip.h"
#include "httpd.h"
#include "fs.h"
#include "fsdata.h"
#include "cgi.h"
#define NULL ( void * ) 0
/* The HTTP server states: */
#define HTTP_NOGET 0
#define HTTP_FILE 1
#define HTTP_TEXT 2
#define HTTP_FUNC 3
#define HTTP_END 4
#ifdef DEBUG
#include
#define PRINT( x )
#define PRINTLN( x )
#else /* DEBUG */
#define PRINT( x )
#define PRINTLN( x )
#endif /* DEBUG */
struct httpd_state *hs;
extern const struct fsdata_file file_index_html;
extern const struct fsdata_file file_404_html;
static void next_scriptline( void );
static void next_scriptstate( void );
#define ISO_G 0x47
#define ISO_E 0x45
#define ISO_T 0x54
#define ISO_slash 0x2f
#define ISO_c 0x63
#define ISO_g 0x67
#define ISO_i 0x69
#define ISO_space 0x20
#define ISO_nl 0x0a
#define ISO_cr 0x0d
#define ISO_a 0x61
#define ISO_t 0x74
#define ISO_hash 0x23
#define ISO_period 0x2e
#define httpPORT 80
/*
=======================================================================================================================
Initialize the web server. Starts to listen for incoming connection requests on TCP port 80.
=======================================================================================================================
*/
void httpd_init( void )
{
fs_init();
/* Listen to port 80. */
uip_listen( HTONS( httpPORT ) );
}
/*
=======================================================================================================================
=======================================================================================================================
*/
void httpd_appcall( void )
{
/*~~~~~~~~~~~~~~~~~~~*/
struct fs_file fsfile;
u8_t i;
/*~~~~~~~~~~~~~~~~~~~*/
switch( uip_conn->lport )
{
/* This is the web server: */
case HTONS( httpPORT ):
/* Pick out the application state from the uip_conn structure. */
hs = ( struct httpd_state * ) ( uip_conn->appstate );
/*
* We use the uip_ test functions to deduce why we were called. If uip_connected()
* is non-zero, we were called because a remote host has connected to us. If
* uip_newdata() is non-zero, we were called because the remote host has sent us
* new data, and if uip_acked() is non-zero, the remote host has acknowledged the
* data we previously sent to it.
*/
if( uip_connected() )
{
/*
* Since we have just been connected with the remote host, we reset the state for
* this connection. The ->count variable contains the amount of data that is yet
* to be sent to the remote host, and the ->state is set to HTTP_NOGET to signal
* that we haven't received any HTTP GET request for this connection yet.
*/
hs->state = HTTP_NOGET;
hs->count = 0;
return;
}
else if( uip_poll() )
{
/*
* If we are polled ten times, we abort the connection. This is because we don't
* want connections lingering indefinately in the system.
*/
if( hs->count++ >= 10 )
{
uip_abort();
}
return;
}
else if( uip_newdata() && hs->state == HTTP_NOGET )
{
/*
* This is the first data we receive, and it should contain a GET. £
* Check for GET.
*/
if
(
uip_appdata[0] != ISO_G
|| uip_appdata[1] != ISO_E
|| uip_appdata[2] != ISO_T
|| uip_appdata[3] != ISO_space
)
{
/* If it isn't a GET, we abort the connection. */
uip_abort();
return;
}
/* Find the file we are looking for. */
for( i = 4; i < 40; ++i )
{
if( uip_appdata[i] == ISO_space || uip_appdata[i] == ISO_cr || uip_appdata[i] == ISO_nl )
{
uip_appdata[i] = 0;
break;
}
}
PRINT( "request for file " );
PRINTLN( &uip_appdata[4] );
/* Check for a request for "/". */
if( uip_appdata[4] == ISO_slash && uip_appdata[5] == 0 )
{
fs_open( file_index_html.name, &fsfile );
}
else
{
if( !fs_open( ( const char * ) &uip_appdata[4], &fsfile ) )
{
PRINTLN( "couldn't open file" );
fs_open( file_404_html.name, &fsfile );
}
}
if
(
uip_appdata[4] == ISO_slash
&& uip_appdata[5] == ISO_c
&& uip_appdata[6] == ISO_g
&& uip_appdata[7] == ISO_i
&& uip_appdata[8] == ISO_slash
)
{
/*
* If the request is for a file that starts with "/cgi/", we prepare for invoking
* a script.
*/
hs->script = fsfile.data;
next_scriptstate();
}
else
{
hs->script = NULL;
/*
* The web server is now no longer in the HTTP_NOGET state, but in the HTTP_FILE
* state since is has now got the GET from the client and will start transmitting
* the file.
*/
hs->state = HTTP_FILE;
/*
* Point the file pointers in the connection state to point to the first byte of
* the file.
*/
hs->dataptr = fsfile.data;
hs->count = fsfile.len;
}
}
if( hs->state != HTTP_FUNC )
{
/*
* Check if the client (remote end) has acknowledged any data that we've
* previously sent. If so, we move the file pointer further into the file and send
* back more data. If we are out of data to send, we close the connection.
*/
if( uip_acked() )
{
if( hs->count >= uip_conn->len )
{
hs->count -= uip_conn->len;
hs->dataptr += uip_conn->len;
}
else
{
hs->count = 0;
}
if( hs->count == 0 )
{
if( hs->script != NULL )
{
next_scriptline();
next_scriptstate();
}
else
{
uip_close();
}
}
}
}
else
{
/* Call the CGI function. */
if( cgitab[hs->script[2] - ISO_a](uip_acked()) )
{
/* If the function returns non-zero, we jump to the next line in the script. */
next_scriptline();
next_scriptstate();
}
}
if( hs->state != HTTP_FUNC && !uip_poll() )
{
/* Send a piece of data, but not more than the MSS of the connection. */
uip_send( ( void * ) hs->dataptr, hs->count );
}
/* Finally, return to uIP. Our outgoing packet will soon be on its way... */
return;
default:
/* Should never happen. */
uip_abort();
break;
}
}
/*
=======================================================================================================================
next_scriptline(): Reads the script until it finds a newline.
=======================================================================================================================
*/
static void next_scriptline( void )
{
/* Loop until we find a newline character. */
do
{
++( hs->script );
} while( hs->script[0] != ISO_nl );
/* Eat up the newline as well. */
++( hs->script );
}
/*
=======================================================================================================================
next_sciptstate: Reads one line of script and decides what to do next.
=======================================================================================================================
*/
static void next_scriptstate( void )
{
/*~~~~~~~~~~~~~~~~~~~*/
struct fs_file fsfile;
u8_t i;
/*~~~~~~~~~~~~~~~~~~~*/
again:
switch( hs->script[0] )
{
case ISO_t:
/* Send a text string. */
hs->state = HTTP_TEXT;
hs->dataptr = &hs->script[2];
/* Calculate length of string. */
for( i = 0; hs->dataptr[i] != ISO_nl; ++i );
hs->count = i;
break;
case ISO_c:
/* Call a function. */
hs->state = HTTP_FUNC;
hs->dataptr = NULL;
hs->count = 0;
cgitab[hs->script[2] - ISO_a]( 0 );
break;
case ISO_i:
/* Include a file. */
hs->state = HTTP_FILE;
if( !fs_open( &hs->script[2], &fsfile ) )
{
uip_abort();
}
hs->dataptr = fsfile.data;
hs->count = fsfile.len;
break;
case ISO_hash:
/* Comment line. */
next_scriptline();
goto again;
case ISO_period:
/* End of script. */
hs->state = HTTP_END;
uip_close();
break;
default:
uip_abort();
break;
}
}
/*
* @} £
* @}
*/