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285 lines
10 KiB
285 lines
10 KiB
8 years ago
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2017.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2017 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 disclaims 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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* 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 filename to fetch when a directory is requested */
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const char PROGMEM DefaultDirFileName[] = "index.htm";
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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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/** FATFs 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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/* Lock to the closed state so that no further processing will occur on the connection */
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AppState->HTTPServer.CurrentState = WEBSERVER_STATE_Closing;
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AppState->HTTPServer.NextState = WEBSERVER_STATE_Closing;
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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())
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{
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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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}
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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_SendData:
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HTTPServerApp_SendData();
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break;
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case WEBSERVER_STATE_Closing:
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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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/* If connection is not already closed, close it */
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uip_close();
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AppState->HTTPServer.CurrentState = WEBSERVER_STATE_Closed;
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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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char* RequestedFileName = strtok(NULL, " ");
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/* Must be a GET request, abort otherwise */
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if (strcmp_P(RequestToken, PSTR("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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/* Copy over the requested filename */
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strlcpy(AppState->HTTPServer.FileName, &RequestedFileName[1], sizeof(AppState->HTTPServer.FileName));
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/* Determine the length of the URI so that it can be checked to see if it is a directory */
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uint8_t FileNameLen = strlen(AppState->HTTPServer.FileName);
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/* If the URI is a directory, append the default filename */
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if ((AppState->HTTPServer.FileName[FileNameLen - 1] == '/') || !(FileNameLen))
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{
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strlcpy_P(&AppState->HTTPServer.FileName[FileNameLen], DefaultDirFileName,
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(sizeof(AppState->HTTPServer.FileName) - FileNameLen));
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}
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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,
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(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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char* Extension = strpbrk(AppState->HTTPServer.FileName, ".");
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bool FoundMIMEType = false;
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/* If the file isn't already open, it wasn't found - send back a 404 error response and abort */
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if (!(AppState->HTTPServer.FileOpen))
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{
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/* Copy over the HTTP 404 response header and send it to the receiving client */
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strcpy_P(AppData, HTTP404Header);
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strcat(AppData, AppState->HTTPServer.FileName);
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uip_send(AppData, strlen(AppData));
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AppState->HTTPServer.NextState = WEBSERVER_STATE_Closing;
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return;
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}
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/* Copy over the HTTP 200 response header and send it to the receiving client */
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strcpy_P(AppData, HTTP200Header);
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/* Check to see if a MIME type for the requested file's extension was found */
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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 (uint8_t 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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strcat(AppData, MIMETypes[i].MIMEType);
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FoundMIMEType = true;
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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 (!(FoundMIMEType))
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{
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/* MIME type not found - copy over the default MIME type */
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strcat_P(AppData, DefaultMIMEType);
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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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strcat_P(AppData, PSTR("\r\n\r\n"));
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/* Send the MIME header to the receiving client */
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uip_send(AppData, strlen(AppData));
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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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/* Get the maximum segment size for the current packet */
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uint16_t MaxChunkSize = uip_mss();
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/* Read the next chunk of data from the open file */
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f_read(&AppState->HTTPServer.FileHandle, AppData, MaxChunkSize, &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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if (MaxChunkSize != AppState->HTTPServer.SentChunkSize)
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AppState->HTTPServer.NextState = WEBSERVER_STATE_Closing;
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}
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