Demos/Device/RNDISEthernet/Webserver.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2009.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, and distribute this software
  13   and its documentation for any purpose and without fee is hereby
  14   granted, provided that the above copyright notice appear in all
  15   copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaim all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 /** \file
  32  *
  33  *  Simple webserver application for demonstrating the RNDIS demo and TCP/IP stack. This
  34  *  application will serve up a static HTTP webpage when requested by the host.
  35  */
  36
  37 #include "Webserver.h"
  38
  39 /** HTTP server response header, for transmission before the page contents. This indicates to the host that a page exists at the
  40  *  given location, and gives extra connection information.
  41  */
  42 char PROGMEM HTTPHeader[] = "HTTP/1.1 200 OK\r\n"
  43                             "Server: LUFA RNDIS\r\n"
  44                             "Content-type: text/html\r\n"
  45                             "Connection: close\r\n\r\n";
  46
  47 /** 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
  48  *  broken up into smaller blocks and sent as a series of packets each time the webserver application callback is run.
  49  */
  50 char PROGMEM HTTPPage[]   =
  51                 "<html>"
  52                 "       <head>"
  53                 "               <title>"
  54                 "                       LUFA Webserver Demo"
  55                 "               </title>"
  56                 "       </head>"
  57                 "       <body>"
  58                 "               <h1>Hello from your USB AVR!</h1>"
  59                 "               <p>"
  60                 "                       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."
  61                 "                       <br /><br />"
  62                 "                       <small>Project Information: <a href=\"http://www.fourwalledcubicle.com/LUFA.php\">http://www.fourwalledcubicle.com/LUFA.php</a>.</small>"
  63                 "                       <hr />"
  64                 "                       <i>LUFA Version: </i>" LUFA_VERSION_STRING
  65                 "               </p>"
  66                 "       </body>"
  67                 "</html>";
  68
  69
  70 /** Initializes the Webserver application, opening the appropriate HTTP port in the TCP handler and registering the application
  71  *  callback routine for packets sent to the HTTP protocol port.
  72  */
  73 void Webserver_Init(void)
  74 {
  75         /* Open the HTTP port in the TCP protocol so that HTTP connections to the device can be established */
  76         TCP_SetPortState(TCP_PORT_HTTP, TCP_Port_Open, Webserver_ApplicationCallback);
  77 }
  78
  79 /** Indicates if a given request equals the given HTTP command.
  80  *
  81  *  \param RequestHeader  HTTP request made by the host
  82  *  \param Command        HTTP command to compare the request to
  83  *
  84  *  \return Boolean true if the command matches the request, false otherwise
  85  */
  86 static bool IsHTTPCommand(uint8_t* RequestHeader, char* Command)
  87 {
  88         /* Returns true if the non null terminated string in RequestHeader matches the null terminated string Command */
  89         return (strncmp((char*)RequestHeader, Command, strlen(Command)) == 0);
  90 }
  91
  92 /** Application callback routine, executed each time the TCP processing task runs. This callback determines what request
  93  *  has been made (if any), and serves up appropriate responses.
  94  *
  95  *  \param ConnectionState  Pointer to a TCP Connection State structure giving connection information
  96  *  \param Buffer           Pointer to the application's send/receive packet buffer
  97  */
  98 void Webserver_ApplicationCallback(TCP_ConnectionState_t* ConnectionState, TCP_ConnectionBuffer_t* Buffer)
  99 {
 100         char*          BufferDataStr = (char*)Buffer->Data;
 101         static uint8_t PageBlock     = 0;
 102
 103         /* Check to see if a packet has been received on the HTTP port from a remote host */
 104         if (TCP_APP_HAS_RECEIVED_PACKET(Buffer))
 105         {
 106                 if (IsHTTPCommand(Buffer->Data, "GET"))
 107                 {
 108                         PageBlock = 0;
 109
 110                         /* Copy the HTTP response header into the packet buffer */
 111                         strcpy_P(BufferDataStr, HTTPHeader);
 112
 113                         /* Send the buffer contents to the host */
 114                         TCP_APP_SEND_BUFFER(Buffer, strlen(BufferDataStr));
 115
 116                         /* Lock the buffer to Device->Host transmissions only while we send the page contents */
 117                         TCP_APP_CAPTURE_BUFFER(Buffer);
 118                 }
 119                 else if (IsHTTPCommand(Buffer->Data, "HEAD"))
 120                 {
 121                         /* Copy the HTTP response header into the packet buffer */
 122                         strcpy_P(BufferDataStr, HTTPHeader);
 123
 124                         /* Send the buffer contents to the host */
 125                         TCP_APP_SEND_BUFFER(Buffer, strlen(BufferDataStr));
 126                 }
 127                 else if (IsHTTPCommand(Buffer->Data, "TRACE"))
 128                 {
 129                         /* Echo the host's query back to the host */
 130                         TCP_APP_SEND_BUFFER(Buffer, Buffer->Length);
 131                 }
 132                 else
 133                 {
 134                         /* Unknown request, just clear the buffer (drop the packet) */
 135                         TCP_APP_CLEAR_BUFFER(Buffer);
 136                 }
 137         }
 138         else if (TCP_APP_HAVE_CAPTURED_BUFFER(Buffer))
 139         {
 140                 uint16_t RemLength = strlen_P(&HTTPPage[PageBlock * HTTP_REPLY_BLOCK_SIZE]);
 141                 uint16_t Length;
 142
 143                 /* Determine the length of the loaded block */
 144                 Length = ((RemLength > HTTP_REPLY_BLOCK_SIZE) ? HTTP_REPLY_BLOCK_SIZE : RemLength);
 145
 146                 /* Copy the next buffer sized block of the page to the packet buffer */
 147                 strncpy_P(BufferDataStr, &HTTPPage[PageBlock * HTTP_REPLY_BLOCK_SIZE], Length);
 148
 149                 /* Send the buffer contents to the host */
 150                 TCP_APP_SEND_BUFFER(Buffer, Length);
 151
 152                 /* Check to see if the entire page has been sent */
 153                 if (PageBlock++ == (sizeof(HTTPPage) / HTTP_REPLY_BLOCK_SIZE))
 154                 {
 155                         /* Unlock the buffer so that the host can fill it with future packets */
 156                         TCP_APP_RELEASE_BUFFER(Buffer);
 157
 158                         /* Close the connection to the host */
 159                         TCP_APP_CLOSECONNECTION(ConnectionState);
 160                 }
 161         }
 162 }