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292 lines
11 KiB
292 lines
11 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2010.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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/*
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Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* Simple HTTP Webserver Application. When connected to the uIP stack,
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* this will serve out files to HTTP clients on port 80.
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*/
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#define INCLUDE_FROM_HTTPSERVERAPP_C
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#include "HTTPServerApp.h"
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/** HTTP server response header, for transmission before the page contents. This indicates to the host that a page exists at the
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* given location, and gives extra connection information.
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*/
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const char PROGMEM HTTP200Header[] = "HTTP/1.1 200 OK\r\n"
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"Server: LUFA " LUFA_VERSION_STRING "\r\n"
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"Connection: close\r\n"
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"MIME-version: 1.0\r\n"
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"Content-Type: ";
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/** HTTP server response header, for transmission before a resource not found error. This indicates to the host that the given
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* given URL is invalid, and gives extra error information.
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*/
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const char PROGMEM HTTP404Header[] = "HTTP/1.1 404 Not Found\r\n"
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"Server: LUFA " LUFA_VERSION_STRING "\r\n"
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"Connection: close\r\n"
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"MIME-version: 1.0\r\n"
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"Content-Type: text/plain\r\n\r\n"
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"Error 404: File Not Found";
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/** Default MIME type sent if no other MIME type can be determined. */
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const char PROGMEM DefaultMIMEType[] = "text/plain";
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/** List of MIME types for each supported file extension. */
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const MIME_Type_t MIMETypes[] =
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{
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{.Extension = "htm", .MIMEType = "text/html"},
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{.Extension = "jpg", .MIMEType = "image/jpeg"},
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{.Extension = "gif", .MIMEType = "image/gif"},
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{.Extension = "bmp", .MIMEType = "image/bmp"},
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{.Extension = "png", .MIMEType = "image/png"},
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{.Extension = "ico", .MIMEType = "image/x-icon"},
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{.Extension = "exe", .MIMEType = "application/octet-stream"},
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{.Extension = "gz", .MIMEType = "application/x-gzip"},
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{.Extension = "zip", .MIMEType = "application/zip"},
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{.Extension = "pdf", .MIMEType = "application/pdf"},
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};
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/** FAT Fs structure to hold the internal state of the FAT driver for the dataflash contents. */
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FATFS DiskFATState;
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/** Initialization function for the simple HTTP webserver. */
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void HTTPServerApp_Init(void)
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{
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/* Listen on port 80 for HTTP connections from hosts */
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uip_listen(HTONS(HTTP_SERVER_PORT));
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/* Mount the dataflash disk via FatFS */
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f_mount(0, &DiskFATState);
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}
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/** uIP stack application callback for the simple HTTP webserver. This function must be called each time the
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* TCP/IP stack needs a TCP packet to be processed.
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*/
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void HTTPServerApp_Callback(void)
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{
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uip_tcp_appstate_t* const AppState = &uip_conn->appstate;
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if (uip_aborted() || uip_timedout() || uip_closed())
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{
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/* Connection is being terminated for some reason - close file handle */
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f_close(&AppState->HTTPServer.FileHandle);
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AppState->HTTPServer.FileOpen = false;
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/* Lock to the closed state so that no further processing will occur on the connection */
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AppState->HTTPServer.CurrentState = WEBSERVER_STATE_Closed;
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AppState->HTTPServer.NextState = WEBSERVER_STATE_Closed;
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}
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if (uip_connected())
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{
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/* New connection - initialize connection state values */
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AppState->HTTPServer.CurrentState = WEBSERVER_STATE_OpenRequestedFile;
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AppState->HTTPServer.NextState = WEBSERVER_STATE_OpenRequestedFile;
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AppState->HTTPServer.FileOpen = false;
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AppState->HTTPServer.ACKedFilePos = 0;
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AppState->HTTPServer.SentChunkSize = 0;
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}
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if (uip_acked())
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{
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/* Add the amount of ACKed file data to the total sent file bytes counter */
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AppState->HTTPServer.ACKedFilePos += AppState->HTTPServer.SentChunkSize;
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/* Progress to the next state once the current state's data has been ACKed */
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AppState->HTTPServer.CurrentState = AppState->HTTPServer.NextState;
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}
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if (uip_rexmit() || uip_acked() || uip_newdata() || uip_connected() || uip_poll())
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{
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switch (AppState->HTTPServer.CurrentState)
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{
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case WEBSERVER_STATE_OpenRequestedFile:
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HTTPServerApp_OpenRequestedFile();
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break;
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case WEBSERVER_STATE_SendResponseHeader:
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HTTPServerApp_SendResponseHeader();
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break;
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case WEBSERVER_STATE_SendMIMETypeHeader:
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HTTPServerApp_SendMIMETypeHeader();
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break;
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case WEBSERVER_STATE_SendData:
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HTTPServerApp_SendData();
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break;
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case WEBSERVER_STATE_Closing:
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uip_close();
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AppState->HTTPServer.NextState = WEBSERVER_STATE_Closed;
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break;
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}
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}
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}
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/** HTTP Server State handler for the Request Process state. This state manages the processing of incoming HTTP
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* GET requests to the server from the receiving HTTP client.
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*/
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static void HTTPServerApp_OpenRequestedFile(void)
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{
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uip_tcp_appstate_t* const AppState = &uip_conn->appstate;
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char* const AppData = (char*)uip_appdata;
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/* No HTTP header received from the client, abort processing */
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if (!(uip_newdata()))
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return;
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char* RequestToken = strtok(AppData, " ");
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/* Must be a GET request, abort otherwise */
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if (strcmp(RequestToken, "GET") != 0)
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{
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uip_abort();
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return;
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}
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char* RequestedFileName = strtok(NULL, " ");
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/* If the requested filename has more that just the leading '/' path in it, copy it over */
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if (strlen(RequestedFileName) > 1)
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strncpy(AppState->HTTPServer.FileName, &RequestedFileName[1], (sizeof(AppState->HTTPServer.FileName) - 1));
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else
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strcpy(AppState->HTTPServer.FileName, "index.htm");
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/* Ensure filename is null-terminated */
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AppState->HTTPServer.FileName[(sizeof(AppState->HTTPServer.FileName) - 1)] = 0x00;
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/* Try to open the file from the Dataflash disk */
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AppState->HTTPServer.FileOpen = (f_open(&AppState->HTTPServer.FileHandle, AppState->HTTPServer.FileName, FA_OPEN_EXISTING | FA_READ) == FR_OK);
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/* Lock to the SendResponseHeader state until connection terminated */
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AppState->HTTPServer.CurrentState = WEBSERVER_STATE_SendResponseHeader;
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AppState->HTTPServer.NextState = WEBSERVER_STATE_SendResponseHeader;
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}
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/** HTTP Server State handler for the HTTP Response Header Send state. This state manages the transmission of
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* the HTTP response header to the receiving HTTP client.
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*/
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static void HTTPServerApp_SendResponseHeader(void)
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{
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uip_tcp_appstate_t* const AppState = &uip_conn->appstate;
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char* const AppData = (char*)uip_appdata;
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const char* HeaderToSend;
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/* Determine which HTTP header should be sent to the client */
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if (AppState->HTTPServer.FileOpen)
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{
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HeaderToSend = HTTP200Header;
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AppState->HTTPServer.NextState = WEBSERVER_STATE_SendMIMETypeHeader;
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}
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else
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{
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HeaderToSend = HTTP404Header;
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AppState->HTTPServer.NextState = WEBSERVER_STATE_Closing;
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}
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/* Copy over the HTTP response header and send it to the receiving client */
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strcpy_P(AppData, HeaderToSend);
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uip_send(AppData, strlen(AppData));
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}
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/** HTTP Server State handler for the MIME Header Send state. This state manages the transmission of the file
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* MIME type header for the requested file to the receiving HTTP client.
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*/
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static void HTTPServerApp_SendMIMETypeHeader(void)
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{
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uip_tcp_appstate_t* const AppState = &uip_conn->appstate;
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char* const AppData = (char*)uip_appdata;
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char* Extension = strpbrk(AppState->HTTPServer.FileName, ".");
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uint16_t MIMEHeaderLength = 0;
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/* Check to see if a file extension was found for the requested filename */
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if (Extension != NULL)
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{
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/* Look through the MIME type list, copy over the required MIME type if found */
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for (int i = 0; i < (sizeof(MIMETypes) / sizeof(MIMETypes[0])); i++)
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{
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if (strcmp(&Extension[1], MIMETypes[i].Extension) == 0)
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{
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MIMEHeaderLength = strlen(MIMETypes[i].MIMEType);
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strncpy(AppData, MIMETypes[i].MIMEType, MIMEHeaderLength);
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break;
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}
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}
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}
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/* Check if a MIME type was found and copied to the output buffer */
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if (!(MIMEHeaderLength))
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{
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/* MIME type not found - copy over the default MIME type */
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MIMEHeaderLength = strlen_P(DefaultMIMEType);
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strncpy_P(AppData, DefaultMIMEType, MIMEHeaderLength);
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}
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/* Add the end-of line terminator and end-of-headers terminator after the MIME type */
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strncpy(&AppData[MIMEHeaderLength], "\r\n\r\n", sizeof("\r\n\r\n"));
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MIMEHeaderLength += (sizeof("\r\n\r\n") - 1);
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/* Send the MIME header to the receiving client */
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uip_send(AppData, MIMEHeaderLength);
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/* When the MIME header is ACKed, progress to the data send stage */
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AppState->HTTPServer.NextState = WEBSERVER_STATE_SendData;
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}
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/** HTTP Server State handler for the Data Send state. This state manages the transmission of file chunks
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* to the receiving HTTP client.
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*/
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static void HTTPServerApp_SendData(void)
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{
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uip_tcp_appstate_t* const AppState = &uip_conn->appstate;
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char* const AppData = (char*)uip_appdata;
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/* Must determine the maximum segment size to determine maximum file chunk size - never send a completely
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* full packet, as this will cause some hosts to start delaying ACKs until a non-full packet is received.
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* since uIP only allows one packet to be in transit at a time, this would cause long delays between packets
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* until the host times out and sends the ACK for the last received packet.
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*/
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uint16_t MaxSegmentSize = (uip_mss() >> 1);
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/* Return file pointer to the last ACKed position */
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f_lseek(&AppState->HTTPServer.FileHandle, AppState->HTTPServer.ACKedFilePos);
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/* Read the next chunk of data from the open file */
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f_read(&AppState->HTTPServer.FileHandle, AppData, MaxSegmentSize, &AppState->HTTPServer.SentChunkSize);
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/* Send the next file chunk to the receiving client */
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uip_send(AppData, AppState->HTTPServer.SentChunkSize);
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/* Check if we are at the last chunk of the file, if so next ACK should close the connection */
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AppState->HTTPServer.NextState = (MaxSegmentSize != AppState->HTTPServer.SentChunkSize) ? WEBSERVER_STATE_Closing : WEBSERVER_STATE_SendData;
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}
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