HTTPServerApp.c 10.4 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
/*
             LUFA Library
     Copyright (C) Dean Camera, 2010.
              
  dean [at] fourwalledcubicle [dot] com
      www.fourwalledcubicle.com
*/

/*
  Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)

  Permission to use, copy, modify, distribute, and sell this 
  software and its documentation for any purpose is hereby granted
  without fee, provided that the above copyright notice appear in 
  all copies and that both that the copyright notice and this
  permission notice and warranty disclaimer appear in supporting 
  documentation, and that the name of the author not be used in 
  advertising or publicity pertaining to distribution of the 
  software without specific, written prior permission.

  The author disclaim all warranties with regard to this
  software, including all implied warranties of merchantability
  and fitness.  In no event shall the author be liable for any
  special, indirect or consequential damages or any damages
  whatsoever resulting from loss of use, data or profits, whether
  in an action of contract, negligence or other tortious action,
  arising out of or in connection with the use or performance of
  this software.
*/

/** \file
 *
 *  Simple HTTP Webserver Application. When connected to the uIP stack,
 *  this will serve out files to HTTP clients.
 */
 
37
#define  INCLUDE_FROM_HTTPSERVERAPP_C
38
39
40
41
42
43
44
#include "HTTPServerApp.h"

/** HTTP server response header, for transmission before the page contents. This indicates to the host that a page exists at the
 *  given location, and gives extra connection information.
 */
char PROGMEM HTTP200Header[] = "HTTP/1.1 200 OK\r\n"
                               "Server: LUFA RNDIS\r\n"
45
                               "Connection: close\r\n"
46
47
                               "MIME-version: 1.0\r\n"
                               "Content-Type: ";
48
49
50
51
52
53

/** HTTP server response header, for transmission before a resource not found error. This indicates to the host that the given
 *  given URL is invalid, and gives extra error information.
 */
char PROGMEM HTTP404Header[] = "HTTP/1.1 404 Not Found\r\n"
                               "Server: LUFA RNDIS\r\n"
54
                               "Connection: close\r\n"
55
56
57
                               "MIME-version: 1.0\r\n"
                               "Content-Type: text/plain\r\n\r\n"
                               "Error 404: File Not Found";
58
59
60
61

/** Default MIME type sent if no other MIME type can be determined */
char PROGMEM DefaultMIMEType[] = "text/plain";

62
/** List of MIME types for each supported file extension. */
63
64
65
66
67
68
69
MIME_Type_t PROGMEM MIMETypes[] =
	{
		{.Extension = "htm", .MIMEType = "text/html"},
		{.Extension = "jpg", .MIMEType = "image/jpeg"},
		{.Extension = "gif", .MIMEType = "image/gif"},
		{.Extension = "bmp", .MIMEType = "image/bmp"},
		{.Extension = "png", .MIMEType = "image/png"},
70
		{.Extension = "ico", .MIMEType = "image/x-icon"},
71
72
73
74
75
		{.Extension = "exe", .MIMEType = "application/octet-stream"},
		{.Extension = "gz",  .MIMEType = "application/x-gzip"},
		{.Extension = "zip", .MIMEType = "application/zip"},
		{.Extension = "pdf", .MIMEType = "application/pdf"},
	};
76
77
78
79

/** FAT Fs structure to hold the internal state of the FAT driver for the dataflash contents. */
FATFS DiskFATState;

80

81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
/** Initialization function for the simple HTTP webserver. */
void WebserverApp_Init(void)
{
	/* Listen on port 80 for HTTP connections from hosts */
	uip_listen(HTONS(HTTP_SERVER_PORT));
	
	/* Mount the dataflash disk via FatFS */
	f_mount(0, &DiskFATState);
}

/** uIP stack application callback for the simple HTTP webserver. This function must be called each time the
 *  TCP/IP stack needs a TCP packet to be processed.
 */
void WebserverApp_Callback(void)
{
96
	uip_tcp_appstate_t* const AppState = &uip_conn->appstate;
97

98
	if (uip_aborted() || uip_timedout() || uip_closed())
99
	{
100
101
102
		/* Connection is being terminated for some reason - close file handle */
		f_close(&AppState->FileHandle);
		AppState->FileOpen = false;
103
104
105
106
		
		/* Lock to the closed state so that no further processing will occur on the connection */
		AppState->CurrentState  = WEBSERVER_STATE_Closed;
		AppState->NextState     = WEBSERVER_STATE_Closed;
107
	}
108
109

	if (uip_connected())
110
	{
111
		/* New connection - initialize connection state values */
112
113
114
115
116
		AppState->CurrentState  = WEBSERVER_STATE_OpenRequestedFile;
		AppState->NextState     = WEBSERVER_STATE_OpenRequestedFile;
		AppState->FileOpen      = false;
		AppState->ACKedFilePos  = 0;
		AppState->SentChunkSize = 0;
117
	}
118
119

	if (uip_acked())
120
	{
121
122
123
124
125
		/* Add the amount of ACKed file data to the total sent file bytes counter */
		AppState->ACKedFilePos += AppState->SentChunkSize;

		/* Progress to the next state once the current state's data has been ACKed */
		AppState->CurrentState = AppState->NextState;
126
	}
127

128
	if (uip_rexmit() || uip_acked() || uip_newdata() || uip_connected() || uip_poll())
129
	{
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
		switch (AppState->CurrentState)
		{
			case WEBSERVER_STATE_OpenRequestedFile:
				Webserver_OpenRequestedFile();
				break;
			case WEBSERVER_STATE_SendResponseHeader:
				Webserver_SendResponseHeader();
				break;
			case WEBSERVER_STATE_SendMIMETypeHeader:
				Webserver_SendMIMETypeHeader();	
				break;
			case WEBSERVER_STATE_SendData:
				Webserver_SendData();
				break;
			case WEBSERVER_STATE_Closing:
				uip_close();
146
				
147
148
149
150
151
				AppState->NextState = WEBSERVER_STATE_Closed;
				break;
		}		  
	}		
}
152

153
154
155
156
157
158
/** HTTP Server State handler for the Request Process state. This state manages the processing of incomming HTTP
 *  GET requests to the server from the receiving HTTP client.
 */
static void Webserver_OpenRequestedFile(void)
{
	uip_tcp_appstate_t* const AppState    = &uip_conn->appstate;
159
	char*               const AppData     = (char*)uip_appdata;
160
161
162
163
164
165
	
	/* No HTTP header received from the client, abort processing */
	if (!(uip_newdata()))
	  return;
	  
	char* RequestToken = strtok(AppData, " ");
166
			
167
168
169
170
171
172
	/* Must be a GET request, abort otherwise */
	if (strcmp(RequestToken, "GET") != 0)
	{
		uip_abort();
		return;
	}
173

174
175
176
177
178
179
180
	char* RequestedFileName = strtok(NULL, " ");
	
	/* If the requested filename has more that just the leading '/' path in it, copy it over */
	if (strlen(RequestedFileName) > 1)
	  strncpy(AppState->FileName, &RequestedFileName[1], (sizeof(AppState->FileName) - 1));
	else
	  strcpy(AppState->FileName, "index.htm");
181

182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
	/* Ensure filename is null-terminated */
	AppState->FileName[(sizeof(AppState->FileName) - 1)] = 0x00;
	
	/* Try to open the file from the Dataflash disk */
	AppState->FileOpen     = (f_open(&AppState->FileHandle, AppState->FileName, FA_OPEN_EXISTING | FA_READ) == FR_OK);

	/* Lock to the SendResponseHeader state until connection terminated */
	AppState->CurrentState = WEBSERVER_STATE_SendResponseHeader;
	AppState->NextState    = WEBSERVER_STATE_SendResponseHeader;
}

/** HTTP Server State handler for the HTTP Response Header Send state. This state manages the transmission of
 *  the HTTP response header to the receiving HTTP client.
 */
static void Webserver_SendResponseHeader(void)
{
	uip_tcp_appstate_t* const AppState    = &uip_conn->appstate;
199
	char*               const AppData     = (char*)uip_appdata;
200
201
202
203

	char*    HeaderToSend;
	uint16_t HeaderLength;

204
	/* Determine which HTTP header should be sent to the client */
205
206
207
208
209
210
211
212
213
214
215
	if (AppState->FileOpen)
	{
		HeaderToSend = HTTP200Header;
		AppState->NextState = WEBSERVER_STATE_SendMIMETypeHeader;
	}
	else
	{
		HeaderToSend = HTTP404Header;
		AppState->NextState = WEBSERVER_STATE_Closing;
	}

216
	/* Copy over the HTTP response header and send it to the receiving client */
217
218
219
220
221
222
223
224
225
226
227
	HeaderLength = strlen_P(HeaderToSend);
	strncpy_P(AppData, HeaderToSend, HeaderLength);
	uip_send(AppData, HeaderLength);
}

/** HTTP Server State handler for the MIME Header Send state. This state manages the transmission of the file
 *  MIME type header for the requested file to the receiving HTTP client.
 */
static void Webserver_SendMIMETypeHeader(void)
{
	uip_tcp_appstate_t* const AppState    = &uip_conn->appstate;
228
	char*               const AppData     = (char*)uip_appdata;
229

230
231
	char*    Extension        = strpbrk(AppState->FileName, ".");
	uint16_t MIMEHeaderLength = 0;
232

233
234
235
236
237
238
239
	/* Check to see if a file extension was found for the requested filename */
	if (Extension != NULL)
	{
		/* Look through the MIME type list, copy over the required MIME type if found */
		for (int i = 0; i < (sizeof(MIMETypes) / sizeof(MIMETypes[0])); i++)
		{
			if (strcmp_P(&Extension[1], MIMETypes[i].Extension) == 0)
240
			{
241
242
243
				MIMEHeaderLength = strlen_P(MIMETypes[i].MIMEType);
				strncpy_P(AppData, MIMETypes[i].MIMEType, MIMEHeaderLength);						
				break;
244
			}
245
246
		} 
	}
247

248
249
250
251
252
253
	/* Check if a MIME type was found and copied to the output buffer */
	if (!(MIMEHeaderLength))
	{
		/* MIME type not found - copy over the default MIME type */
		MIMEHeaderLength = strlen_P(DefaultMIMEType);
		strncpy_P(AppData, DefaultMIMEType, MIMEHeaderLength);
254
	}
255
256
257
258
259
260
261
262
263
264
265
	
	/* Add the end-of line terminator and end-of-headers terminator after the MIME type */
	strncpy(&AppData[MIMEHeaderLength], "\r\n\r\n", sizeof("\r\n\r\n"));
	MIMEHeaderLength += (sizeof("\r\n\r\n") - 1);
	
	/* Send the MIME header to the receiving client */
	uip_send(AppData, MIMEHeaderLength);
	
	/* When the MIME header is ACKed, progress to the data send stage */
	AppState->NextState = WEBSERVER_STATE_SendData;
}
266

267
268
269
270
271
272
/** HTTP Server State handler for the Data Send state. This state manages the transmission of file chunks
 *  to the receiving HTTP client.
 */
static void Webserver_SendData(void)
{
	uip_tcp_appstate_t* const AppState    = &uip_conn->appstate;
273
	char*               const AppData     = (char*)uip_appdata;
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288

	/* Must determine the maximum segment size to determine maximum file chunk size */
	uint16_t MaxSegmentSize = uip_mss();

	/* Return file pointer to the last ACKed position */
	f_lseek(&AppState->FileHandle, AppState->ACKedFilePos);
	
	/* Read the next chunk of data from the open file */
	f_read(&AppState->FileHandle, AppData, MaxSegmentSize, &AppState->SentChunkSize);
	
	/* Send the next file chunk to the receiving client */
	uip_send(AppData, AppState->SentChunkSize);
			
	/* Check if we are at the last chunk of the file, if so next ACK should close the connection */
	AppState->NextState = (MaxSegmentSize != AppState->SentChunkSize) ? WEBSERVER_STATE_Closing : WEBSERVER_STATE_SendData;
289
}