Projects/Webserver/Lib/HTTPServerApp.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2010.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all 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 HTTP Webserver Application. When connected to the uIP stack,
  34  *  this will serve out files to HTTP clients.
  35  */
  36
  37 #include "HTTPServerApp.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 HTTP200Header[] = "HTTP/1.1 200 OK\r\n"
  43                                "Server: LUFA RNDIS\r\n"
  44                                "Connection: close\r\n"
  45                                                            "MIME-version: 1.0\r\n"
  46                                                            "Content-Type: ";
  47
  48 /** HTTP server response header, for transmission before a resource not found error. This indicates to the host that the given
  49  *  given URL is invalid, and gives extra error information.
  50  */
  51 char PROGMEM HTTP404Header[] = "HTTP/1.1 404 Not Found\r\n"
  52                                "Server: LUFA RNDIS\r\n"
  53                                "Connection: close\r\n"
  54                                                            "MIME-version: 1.0\r\n"
  55                                                            "Content-Type: text/plain\r\n\r\n"
  56                                                            "Error 404: File Not Found";
  57
  58 /** Default MIME type sent if no other MIME type can be determined */
  59 char PROGMEM DefaultMIMEType[] = "text/plain";
  60
  61 /** List of MIME types for each supported file extension - must be terminated with \ref END_OF_MIME_LIST entry. */
  62 MIME_Type_t PROGMEM MIMETypes[] =
  63         {
  64                 {.Extension = "htm", .MIMEType = "text/html"},
  65                 {.Extension = "jpg", .MIMEType = "image/jpeg"},
  66                 {.Extension = "gif", .MIMEType = "image/gif"},
  67                 {.Extension = "bmp", .MIMEType = "image/bmp"},
  68                 {.Extension = "png", .MIMEType = "image/png"},
  69                 {.Extension = "exe", .MIMEType = "application/octet-stream"},
  70                 {.Extension = "gz",  .MIMEType = "application/x-gzip"},
  71                 {.Extension = "ico", .MIMEType = "image/x-icon"},
  72                 {.Extension = "zip", .MIMEType = "application/zip"},
  73                 {.Extension = "pdf", .MIMEType = "application/pdf"},
  74         };
  75
  76 /** FAT Fs structure to hold the internal state of the FAT driver for the dataflash contents. */
  77 FATFS DiskFATState;
  78
  79
  80 /** Initialization function for the simple HTTP webserver. */
  81 void WebserverApp_Init(void)
  82 {
  83         /* Listen on port 80 for HTTP connections from hosts */
  84         uip_listen(HTONS(HTTP_SERVER_PORT));
  85
  86         /* Mount the dataflash disk via FatFS */
  87         f_mount(0, &DiskFATState);
  88 }
  89
  90 /** uIP stack application callback for the simple HTTP webserver. This function must be called each time the
  91  *  TCP/IP stack needs a TCP packet to be processed.
  92  */
  93 void WebserverApp_Callback(void)
  94 {
  95         uip_tcp_appstate_t* const AppState    = &uip_conn->appstate;
  96         char*                     AppData     = (char*)uip_appdata;
  97         uint16_t                  AppDataSize = 0;
  98
  99         if (uip_aborted() || uip_timedout())
 100         {
 101                 /* Close the file before terminating, if it is open */
 102                 f_close(&AppState->FileToSend);
 103
 104                 AppState->CurrentState = WEBSERVER_STATE_Closed;
 105
 106                 return;
 107         }
 108         else if (uip_closed())
 109         {
 110                 AppState->CurrentState = WEBSERVER_STATE_Closed;
 111
 112                 return;
 113         }
 114         else if (uip_connected())
 115         {
 116                 /* New connection - initialize connection state and data pointer to the appropriate HTTP header */
 117                 AppState->CurrentState = WEBSERVER_STATE_OpenRequestedFile;
 118         }
 119
 120         switch (AppState->CurrentState)
 121         {
 122                 case WEBSERVER_STATE_OpenRequestedFile:
 123                         /* Wait for the packet containing the request header */
 124                         if (uip_datalen())
 125                         {
 126                                 /* Must be a GET request, abort otherwise */
 127                                 if (strncmp(AppData, "GET ", (sizeof("GET ") - 1)) != 0)
 128                                 {
 129                                         uip_abort();
 130                                         break;
 131                                 }
 132
 133                                 /* Copy over the requested filename from the GET request as all-lowercase */
 134                                 for (uint8_t i = 0; i < (sizeof(AppState->FileName) - 1); i++)
 135                                 {
 136                                         AppState->FileName[i] = tolower(AppData[sizeof("GET ") + i]);
 137
 138                                         if (AppState->FileName[i] == ' ')
 139                                         {
 140                                                 AppState->FileName[i] = 0x00;
 141                                                 break;
 142                                         }
 143                                 }
 144
 145                                 /* Ensure requested filename is null-terminated */
 146                                 AppState->FileName[(sizeof(AppState->FileName) - 1)] = 0x00;
 147
 148                                 /* If no filename specified, assume the default of index.htm */
 149                                 if (AppState->FileName[0] == 0x00)
 150                                   strcpy(AppState->FileName, "index.htm");
 151
 152                                 /* Try to open the file from the Dataflash disk */
 153                                 AppState->FileOpen = (f_open(&AppState->FileToSend, AppState->FileName, FA_OPEN_EXISTING | FA_READ) == FR_OK);
 154
 155                                 AppState->CurrentState = WEBSERVER_STATE_SendResponseHeader;
 156                         }
 157
 158                         break;
 159                 case WEBSERVER_STATE_SendResponseHeader:
 160                         /* Determine what HTTP header should be sent to the client */
 161                         if (AppState->FileOpen)
 162                         {
 163                                 AppDataSize = strlen_P(HTTP200Header);
 164                                 strncpy_P(AppData, HTTP200Header, AppDataSize);
 165                         }
 166                         else
 167                         {
 168                                 AppDataSize = strlen_P(HTTP404Header);
 169                                 strncpy_P(AppData, HTTP404Header, AppDataSize);
 170                         }
 171
 172                         uip_send(AppData, AppDataSize);
 173
 174                         AppState->CurrentState = WEBSERVER_STATE_SendMIMETypeHeader;
 175                         break;
 176                 case WEBSERVER_STATE_SendMIMETypeHeader:
 177                         /* File must have been found and opened for MIME header to be sent */
 178                         if (AppState->FileOpen)
 179                         {
 180                                 char* Extension = strpbrk(AppState->FileName, ".");
 181
 182                                 /* Check to see if a file extension was found for the requested filename */
 183                                 if (Extension != NULL)
 184                                 {
 185                                         /* Look through the MIME type list, copy over the required MIME type if found */
 186                                         for (int i = 0; i < (sizeof(MIMETypes) / sizeof(MIMETypes[0])); i++)
 187                                         {
 188                                                 if (strcmp_P(&Extension[1], MIMETypes[i].Extension) == 0)
 189                                                 {
 190                                                         AppDataSize = strlen_P(MIMETypes[i].MIMEType);
 191                                                         strncpy_P(AppData, MIMETypes[i].MIMEType, AppDataSize);
 192                                                         break;
 193                                                 }
 194                                         }
 195                                 }
 196
 197                                 /* Check if a MIME type was found and copied to the output buffer */
 198                                 if (!(AppDataSize))
 199                                 {
 200                                         /* MIME type not found - copy over the default MIME type */
 201                                         AppDataSize = strlen_P(DefaultMIMEType);
 202                                         strncpy_P(AppData, DefaultMIMEType, AppDataSize);
 203                                 }
 204
 205                                 /* Add the end-of line terminator and end-of-headers terminator after the MIME type */
 206                                 strncpy(&AppData[AppDataSize], "\r\n\r\n", sizeof("\r\n\r\n"));
 207                                 AppDataSize += (sizeof("\r\n\r\n") - 1);
 208
 209                                 uip_send(AppData, AppDataSize);
 210                         }
 211
 212                         AppState->CurrentState = WEBSERVER_STATE_SendData;
 213                         break;
 214                 case WEBSERVER_STATE_SendData:
 215                         /* If end of file/file not open, progress to the close state */
 216                         if (!(AppState->FileOpen))
 217                         {
 218                                 f_close(&AppState->FileToSend);
 219                                 uip_close();
 220                                 AppState->CurrentState = WEBSERVER_STATE_Closed;
 221                                 break;
 222                         }
 223
 224                         uint16_t MaxSegSize = uip_mss();
 225
 226                         /* Read the next chunk of data from the open file */
 227                         f_read(&AppState->FileToSend, AppData, MaxSegSize, &AppDataSize);
 228                         AppState->FileOpen = (MaxSegSize == AppDataSize);
 229
 230                         /* If data was read, send it to the client */
 231                         if (AppDataSize)
 232                           uip_send(AppData, AppDataSize);
 233
 234                         break;
 235         }
 236 }