Projects/Webserver/Lib/HTTPServerApp.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2013.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2013  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 disclaims 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 on port 80.
  35  */
  36
  37 #define  INCLUDE_FROM_HTTPSERVERAPP_C
  38 #include "HTTPServerApp.h"
  39
  40 /** HTTP server response header, for transmission before the page contents. This indicates to the host that a page exists at the
  41  *  given location, and gives extra connection information.
  42  */
  43 const char PROGMEM HTTP200Header[] = "HTTP/1.1 200 OK\r\n"
  44                                      "Server: LUFA " LUFA_VERSION_STRING "\r\n"
  45                                      "Connection: close\r\n"
  46                                      "MIME-version: 1.0\r\n"
  47                                      "Content-Type: ";
  48
  49 /** HTTP server response header, for transmission before a resource not found error. This indicates to the host that the given
  50  *  URL is invalid, and gives extra error information.
  51  */
  52 const char PROGMEM HTTP404Header[] = "HTTP/1.1 404 Not Found\r\n"
  53                                      "Server: LUFA " LUFA_VERSION_STRING "\r\n"
  54                                      "Connection: close\r\n"
  55                                      "MIME-version: 1.0\r\n"
  56                                      "Content-Type: text/plain\r\n\r\n"
  57                                      "Error 404: File Not Found: /";
  58
  59 /** Default filename to fetch when a directory is requested */
  60 const char PROGMEM DefaultDirFileName[] = "index.htm";
  61
  62 /** Default MIME type sent if no other MIME type can be determined. */
  63 const char PROGMEM DefaultMIMEType[] = "text/plain";
  64
  65 /** List of MIME types for each supported file extension. */
  66 const MIME_Type_t MIMETypes[] =
  67         {
  68                 {.Extension = "htm", .MIMEType = "text/html"},
  69                 {.Extension = "jpg", .MIMEType = "image/jpeg"},
  70                 {.Extension = "gif", .MIMEType = "image/gif"},
  71                 {.Extension = "bmp", .MIMEType = "image/bmp"},
  72                 {.Extension = "png", .MIMEType = "image/png"},
  73                 {.Extension = "ico", .MIMEType = "image/x-icon"},
  74                 {.Extension = "exe", .MIMEType = "application/octet-stream"},
  75                 {.Extension = "gz",  .MIMEType = "application/x-gzip"},
  76                 {.Extension = "zip", .MIMEType = "application/zip"},
  77                 {.Extension = "pdf", .MIMEType = "application/pdf"},
  78         };
  79
  80 /** FATFs structure to hold the internal state of the FAT driver for the Dataflash contents. */
  81 FATFS DiskFATState;
  82
  83
  84 /** Initialization function for the simple HTTP webserver. */
  85 void HTTPServerApp_Init(void)
  86 {
  87         /* Listen on port 80 for HTTP connections from hosts */
  88         uip_listen(HTONS(HTTP_SERVER_PORT));
  89
  90         /* Mount the Dataflash disk via FatFS */
  91         f_mount(0, &DiskFATState);
  92 }
  93
  94 /** uIP stack application callback for the simple HTTP webserver. This function must be called each time the
  95  *  TCP/IP stack needs a TCP packet to be processed.
  96  */
  97 void HTTPServerApp_Callback(void)
  98 {
  99         uip_tcp_appstate_t* const AppState = &uip_conn->appstate;
 100
 101         if (uip_aborted() || uip_timedout() || uip_closed())
 102         {
 103                 /* Lock to the closed state so that no further processing will occur on the connection */
 104                 AppState->HTTPServer.CurrentState  = WEBSERVER_STATE_Closing;
 105                 AppState->HTTPServer.NextState     = WEBSERVER_STATE_Closing;
 106         }
 107
 108         if (uip_connected())
 109         {
 110                 /* New connection - initialize connection state values */
 111                 AppState->HTTPServer.CurrentState  = WEBSERVER_STATE_OpenRequestedFile;
 112                 AppState->HTTPServer.NextState     = WEBSERVER_STATE_OpenRequestedFile;
 113                 AppState->HTTPServer.FileOpen      = false;
 114                 AppState->HTTPServer.ACKedFilePos  = 0;
 115                 AppState->HTTPServer.SentChunkSize = 0;
 116         }
 117
 118         if (uip_acked())
 119         {
 120                 /* Add the amount of ACKed file data to the total sent file bytes counter */
 121                 AppState->HTTPServer.ACKedFilePos += AppState->HTTPServer.SentChunkSize;
 122
 123                 /* Progress to the next state once the current state's data has been ACKed */
 124                 AppState->HTTPServer.CurrentState = AppState->HTTPServer.NextState;
 125         }
 126
 127         if (uip_rexmit())
 128         {
 129                 /* Return file pointer to the last ACKed position */
 130                 f_lseek(&AppState->HTTPServer.FileHandle, AppState->HTTPServer.ACKedFilePos);
 131         }
 132
 133         if (uip_rexmit() || uip_acked() || uip_newdata() || uip_connected() || uip_poll())
 134         {
 135                 switch (AppState->HTTPServer.CurrentState)
 136                 {
 137                         case WEBSERVER_STATE_OpenRequestedFile:
 138                                 HTTPServerApp_OpenRequestedFile();
 139                                 break;
 140                         case WEBSERVER_STATE_SendResponseHeader:
 141                                 HTTPServerApp_SendResponseHeader();
 142                                 break;
 143                         case WEBSERVER_STATE_SendData:
 144                                 HTTPServerApp_SendData();
 145                                 break;
 146                         case WEBSERVER_STATE_Closing:
 147                                 /* Connection is being terminated for some reason - close file handle */
 148                                 f_close(&AppState->HTTPServer.FileHandle);
 149                                 AppState->HTTPServer.FileOpen = false;
 150
 151                                 /* If connection is not already closed, close it */
 152                                 uip_close();
 153
 154                                 AppState->HTTPServer.CurrentState = WEBSERVER_STATE_Closed;
 155                                 AppState->HTTPServer.NextState    = WEBSERVER_STATE_Closed;
 156                                 break;
 157                 }
 158         }
 159 }
 160
 161 /** HTTP Server State handler for the Request Process state. This state manages the processing of incoming HTTP
 162  *  GET requests to the server from the receiving HTTP client.
 163  */
 164 static void HTTPServerApp_OpenRequestedFile(void)
 165 {
 166         uip_tcp_appstate_t* const AppState    = &uip_conn->appstate;
 167         char*               const AppData     = (char*)uip_appdata;
 168
 169         /* No HTTP header received from the client, abort processing */
 170         if (!(uip_newdata()))
 171           return;
 172
 173         char* RequestToken      = strtok(AppData, " ");
 174         char* RequestedFileName = strtok(NULL, " ");
 175
 176         /* Must be a GET request, abort otherwise */
 177         if (strcmp_P(RequestToken, PSTR("GET")) != 0)
 178         {
 179                 uip_abort();
 180                 return;
 181         }
 182
 183         /* Copy over the requested filename */
 184         strlcpy(AppState->HTTPServer.FileName, &RequestedFileName[1], sizeof(AppState->HTTPServer.FileName));
 185
 186         /* Determine the length of the URI so that it can be checked to see if it is a directory */
 187         uint8_t FileNameLen = strlen(AppState->HTTPServer.FileName);
 188
 189         /* If the URI is a directory, append the default filename */
 190         if ((AppState->HTTPServer.FileName[FileNameLen - 1] == '/') || !(FileNameLen))
 191         {
 192                 strlcpy_P(&AppState->HTTPServer.FileName[FileNameLen], DefaultDirFileName,
 193                           (sizeof(AppState->HTTPServer.FileName) - FileNameLen));
 194         }
 195
 196         /* Try to open the file from the Dataflash disk */
 197         AppState->HTTPServer.FileOpen     = (f_open(&AppState->HTTPServer.FileHandle, AppState->HTTPServer.FileName,
 198                                                     (FA_OPEN_EXISTING | FA_READ)) == FR_OK);
 199
 200         /* Lock to the SendResponseHeader state until connection terminated */
 201         AppState->HTTPServer.CurrentState = WEBSERVER_STATE_SendResponseHeader;
 202         AppState->HTTPServer.NextState    = WEBSERVER_STATE_SendResponseHeader;
 203 }
 204
 205 /** HTTP Server State handler for the HTTP Response Header Send state. This state manages the transmission of
 206  *  the HTTP response header to the receiving HTTP client.
 207  */
 208 static void HTTPServerApp_SendResponseHeader(void)
 209 {
 210         uip_tcp_appstate_t* const AppState    = &uip_conn->appstate;
 211         char*               const AppData     = (char*)uip_appdata;
 212
 213         char* Extension     = strpbrk(AppState->HTTPServer.FileName, ".");
 214         bool  FoundMIMEType = false;
 215
 216         /* If the file isn't already open, it wasn't found - send back a 404 error response and abort */
 217         if (!(AppState->HTTPServer.FileOpen))
 218         {
 219                 /* Copy over the HTTP 404 response header and send it to the receiving client */
 220                 strcpy_P(AppData, HTTP404Header);
 221                 strcat(AppData, AppState->HTTPServer.FileName);
 222                 uip_send(AppData, strlen(AppData));
 223
 224                 AppState->HTTPServer.NextState = WEBSERVER_STATE_Closing;
 225                 return;
 226         }
 227
 228         /* Copy over the HTTP 200 response header and send it to the receiving client */
 229         strcpy_P(AppData, HTTP200Header);
 230
 231         /* Check to see if a MIME type for the requested file's extension was found */
 232         if (Extension != NULL)
 233         {
 234                 /* Look through the MIME type list, copy over the required MIME type if found */
 235                 for (uint8_t i = 0; i < (sizeof(MIMETypes) / sizeof(MIMETypes[0])); i++)
 236                 {
 237                         if (strcmp(&Extension[1], MIMETypes[i].Extension) == 0)
 238                         {
 239                                 strcat(AppData, MIMETypes[i].MIMEType);
 240                                 FoundMIMEType = true;
 241                                 break;
 242                         }
 243                 }
 244         }
 245
 246         /* Check if a MIME type was found and copied to the output buffer */
 247         if (!(FoundMIMEType))
 248         {
 249                 /* MIME type not found - copy over the default MIME type */
 250                 strcat_P(AppData, DefaultMIMEType);
 251         }
 252
 253         /* Add the end-of-line terminator and end-of-headers terminator after the MIME type */
 254         strcat_P(AppData, PSTR("\r\n\r\n"));
 255
 256         /* Send the MIME header to the receiving client */
 257         uip_send(AppData, strlen(AppData));
 258
 259         /* When the MIME header is ACKed, progress to the data send stage */
 260         AppState->HTTPServer.NextState = WEBSERVER_STATE_SendData;
 261 }
 262
 263 /** HTTP Server State handler for the Data Send state. This state manages the transmission of file chunks
 264  *  to the receiving HTTP client.
 265  */
 266 static void HTTPServerApp_SendData(void)
 267 {
 268         uip_tcp_appstate_t* const AppState    = &uip_conn->appstate;
 269         char*               const AppData     = (char*)uip_appdata;
 270
 271         /* Get the maximum segment size for the current packet */
 272         uint16_t MaxChunkSize = uip_mss();
 273
 274         /* Read the next chunk of data from the open file */
 275         f_read(&AppState->HTTPServer.FileHandle, AppData, MaxChunkSize, &AppState->HTTPServer.SentChunkSize);
 276
 277         /* Send the next file chunk to the receiving client */
 278         uip_send(AppData, AppState->HTTPServer.SentChunkSize);
 279
 280         /* Check if we are at the last chunk of the file, if so next ACK should close the connection */
 281         if (MaxChunkSize != AppState->HTTPServer.SentChunkSize)
 282           AppState->HTTPServer.NextState = WEBSERVER_STATE_Closing;
 283 }
 284