/*
LUFA Library
Copyright ( C ) Dean Camera , 2012.
dean [ at ] fourwalledcubicle [ dot ] com
www . lufa - lib . org
*/
/*
Copyright 2012 Dean Camera ( dean [ at ] fourwalledcubicle [ dot ] com )
Permission to use , copy , modify , distribute , and sell this
software and its documentation for any purpose is hereby granted
without fee , provided that the above copyright notice appear in
all copies and that both that the copyright notice and this
permission notice and warranty disclaimer appear in supporting
documentation , and that the name of the author not be used in
advertising or publicity pertaining to distribution of the
software without specific , written prior permission .
The author disclaim all warranties with regard to this
software , including all implied warranties of merchantability
and fitness . In no event shall the author be liable for any
special , indirect or consequential damages or any damages
whatsoever resulting from loss of use , data or profits , whether
in an action of contract , negligence or other tortious action ,
arising out of or in connection with the use or performance of
this software .
*/
/** \file
*
* Simple webserver application for demonstrating the RNDIS demo and TCP / IP stack . This
* application will serve up a static HTTP web page when requested by the host .
*/
# include "Webserver.h"
/** HTTP server response header, for transmission before the page contents. This indicates to the host that a page exists at the
* given location , and gives extra connection information .
*/
const char HTTP200Header [ ] PROGMEM = " HTTP/1.1 200 OK \r \n "
" Server: LUFA RNDIS \r \n "
" Content-type: text/html \r \n "
" Connection: close \r \n \r \n " ;
/** HTTP server response header, for transmission before a resource not found error. This indicates to the host that the given
* given URL is invalid , and gives extra error information .
*/
const char HTTP404Header [ ] PROGMEM = " HTTP/1.1 404 Not Found \r \n "
" Server: LUFA RNDIS \r \n "
" Connection: close \r \n \r \n " ;
/** HTTP page to serve to the host when a HTTP request is made. This page is too long for a single response, thus it is automatically
* broken up into smaller blocks and sent as a series of packets each time the webserver application callback is run .
*/
const char HTTPPage [ ] PROGMEM =
" <html> "
" <head> "
" <title> "
" LUFA Webserver Demo "
" </title> "
" </head> "
" <body> "
" <h1>Hello from your USB AVR!</h1> "
" <p> "
" Hello! Welcome to the LUFA RNDIS Demo Webserver test page, running on your USB AVR via the LUFA library. This demonstrates the HTTP webserver, TCP/IP stack and RNDIS demo all running atop the LUFA USB stack. "
" <br /><br /> "
" <small>Project Information: <a href= \" http://www.lufa-lib.org \" >http://www.lufa-lib.org</a>.</small> "
" <hr /> "
" <i>LUFA Version: </i> " LUFA_VERSION_STRING
" </p> "
" </body> "
" </html> " ;
/** Initializes the Webserver application, opening the appropriate HTTP port in the TCP handler and registering the application
* callback routine for packets sent to the HTTP protocol port .
*/
void Webserver_Init ( void )
{
/* Open the HTTP port in the TCP protocol so that HTTP connections to the device can be established */
TCP_SetPortState ( TCP_PORT_HTTP , TCP_Port_Open , Webserver_ApplicationCallback ) ;
}
/** Indicates if a given request equals the given HTTP command.
*
* \ param [ in ] RequestHeader HTTP request made by the host
* \ param [ in ] Command HTTP command to compare the request to
*
* \ return Boolean true if the command matches the request , false otherwise
*/
static bool IsHTTPCommand ( uint8_t * RequestHeader ,
char * Command )
{
/* Returns true if the non null terminated string in RequestHeader matches the null terminated string Command */
return ( strncmp ( ( char * ) RequestHeader , Command , strlen ( Command ) ) = = 0 ) ;
}
/** Application callback routine, executed each time the TCP processing task runs. This callback determines what request
* has been made ( if any ) , and serves up appropriate responses .
*
* \ param [ in ] ConnectionState Pointer to a TCP Connection State structure giving connection information
* \ param [ in , out ] Buffer Pointer to the application ' s send / receive packet buffer
*/
void Webserver_ApplicationCallback ( TCP_ConnectionState_t * const ConnectionState ,
TCP_ConnectionBuffer_t * const Buffer )
{
char * BufferDataStr = ( char * ) Buffer - > Data ;
static uint8_t PageBlock = 0 ;
/* Check to see if a packet has been received on the HTTP port from a remote host */
if ( TCP_APP_HAS_RECEIVED_PACKET ( Buffer ) )
{
if ( IsHTTPCommand ( Buffer - > Data , " GET " ) )
{
if ( IsHTTPCommand ( Buffer - > Data , " GET / " ) )
{
PageBlock = 0 ;
/* Copy the HTTP 200 response header into the packet buffer */
strcpy_P ( BufferDataStr , HTTP200Header ) ;
/* Send the buffer contents to the host */
TCP_APP_SEND_BUFFER ( Buffer , strlen ( BufferDataStr ) ) ;
/* Lock the buffer to Device->Host transmissions only while we send the page contents */
TCP_APP_CAPTURE_BUFFER ( Buffer ) ;
}
else
{
/* Copy the HTTP 404 response header into the packet buffer */
strcpy_P ( BufferDataStr , HTTP404Header ) ;
/* Send the buffer contents to the host */
TCP_APP_SEND_BUFFER ( Buffer , strlen ( BufferDataStr ) ) ;
/* All data sent, close the connection */
TCP_APP_CLOSECONNECTION ( ConnectionState ) ;
}
}
else if ( IsHTTPCommand ( Buffer - > Data , " HEAD " ) )
{
if ( IsHTTPCommand ( Buffer - > Data , " HEAD / " ) )
{
/* Copy the HTTP response header into the packet buffer */
strcpy_P ( BufferDataStr , HTTP200Header ) ;
/* Send the buffer contents to the host */
TCP_APP_SEND_BUFFER ( Buffer , strlen ( BufferDataStr ) ) ;
}
else
{
/* Copy the HTTP response header into the packet buffer */
strcpy_P ( BufferDataStr , HTTP404Header ) ;
/* Send the buffer contents to the host */
TCP_APP_SEND_BUFFER ( Buffer , strlen ( BufferDataStr ) ) ;
}
/* All data sent, close the connection */
TCP_APP_CLOSECONNECTION ( ConnectionState ) ;
}
else if ( IsHTTPCommand ( Buffer - > Data , " TRACE " ) )
{
/* Echo the host's query back to the host */
TCP_APP_SEND_BUFFER ( Buffer , Buffer - > Length ) ;
/* All data sent, close the connection */
TCP_APP_CLOSECONNECTION ( ConnectionState ) ;
}
else
{
/* Unknown request, just clear the buffer (drop the packet) */
TCP_APP_CLEAR_BUFFER ( Buffer ) ;
}
}
else if ( TCP_APP_HAVE_CAPTURED_BUFFER ( Buffer ) )
{
uint16_t RemLength = strlen_P ( & HTTPPage [ PageBlock * HTTP_REPLY_BLOCK_SIZE ] ) ;
uint16_t Length ;
/* Determine the length of the loaded block */
Length = ( ( RemLength > HTTP_REPLY_BLOCK_SIZE ) ? HTTP_REPLY_BLOCK_SIZE : RemLength ) ;
/* Copy the next buffer sized block of the page to the packet buffer */
strncpy_P ( BufferDataStr , & HTTPPage [ PageBlock * HTTP_REPLY_BLOCK_SIZE ] , Length ) ;
/* Send the buffer contents to the host */
TCP_APP_SEND_BUFFER ( Buffer , Length ) ;
/* Check to see if the entire page has been sent */
if ( PageBlock + + = = ( sizeof ( HTTPPage ) / HTTP_REPLY_BLOCK_SIZE ) )
{
/* Unlock the buffer so that the host can fill it with future packets */
TCP_APP_RELEASE_BUFFER ( Buffer ) ;
/* Close the connection to the host */
TCP_APP_CLOSECONNECTION ( ConnectionState ) ;
}
}
}
