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
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
|
/* Feel free to use this example code in any way
you see fit (Public Domain) */
#include <sys/types.h>
#ifndef _WIN32
#include <sys/select.h>
#include <sys/socket.h>
#else
#include <winsock2.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <microhttpd.h>
#ifdef _MSC_VER
#ifndef strcasecmp
#define strcasecmp(a,b) _stricmp((a),(b))
#endif /* !strcasecmp */
#endif /* _MSC_VER */
#if defined(_MSC_VER) && _MSC_VER+0 <= 1800
/* Substitution is OK while return value is not used */
#define snprintf _snprintf
#endif
#define PORT 8888
#define POSTBUFFERSIZE 512
#define MAXCLIENTS 2
enum ConnectionType
{
GET = 0,
POST = 1
};
static unsigned int nr_of_uploading_clients = 0;
struct connection_info_struct
{
enum ConnectionType connectiontype;
struct MHD_PostProcessor *postprocessor;
FILE *fp;
const char *answerstring;
int answercode;
};
const char *askpage = "<html><body>\n\
Upload a file, please!<br>\n\
There are %u clients uploading at the moment.<br>\n\
<form action=\"/filepost\" method=\"post\" enctype=\"multipart/form-data\">\n\
<input name=\"file\" type=\"file\">\n\
<input type=\"submit\" value=\" Send \"></form>\n\
</body></html>";
const char *busypage =
"<html><body>This server is busy, please try again later.</body></html>";
const char *completepage =
"<html><body>The upload has been completed.</body></html>";
const char *errorpage =
"<html><body>This doesn't seem to be right.</body></html>";
const char *servererrorpage =
"<html><body>An internal server error has occured.</body></html>";
const char *fileexistspage =
"<html><body>This file already exists.</body></html>";
static int
send_page (struct MHD_Connection *connection,
const char *page,
int status_code)
{
int ret;
struct MHD_Response *response;
response =
MHD_create_response_from_buffer (strlen (page),
(void *) page,
MHD_RESPMEM_MUST_COPY);
if (!response)
return MHD_NO;
MHD_add_response_header (response,
MHD_HTTP_HEADER_CONTENT_TYPE,
"text/html");
ret = MHD_queue_response (connection,
status_code,
response);
MHD_destroy_response (response);
return ret;
}
static int
iterate_post (void *coninfo_cls,
enum MHD_ValueKind kind,
const char *key,
const char *filename,
const char *content_type,
const char *transfer_encoding,
const char *data,
uint64_t off,
size_t size)
{
struct connection_info_struct *con_info = coninfo_cls;
FILE *fp;
con_info->answerstring = servererrorpage;
con_info->answercode = MHD_HTTP_INTERNAL_SERVER_ERROR;
if (0 != strcmp (key, "file"))
return MHD_NO;
if (! con_info->fp)
{
if (NULL != (fp = fopen (filename, "rb")))
{
fclose (fp);
con_info->answerstring = fileexistspage;
con_info->answercode = MHD_HTTP_FORBIDDEN;
return MHD_NO;
}
con_info->fp = fopen (filename, "ab");
if (!con_info->fp)
return MHD_NO;
}
if (size > 0)
{
if (! fwrite (data, sizeof (char), size, con_info->fp))
return MHD_NO;
}
con_info->answerstring = completepage;
con_info->answercode = MHD_HTTP_OK;
return MHD_YES;
}
static void
request_completed (void *cls,
struct MHD_Connection *connection,
void **con_cls,
enum MHD_RequestTerminationCode toe)
{
struct connection_info_struct *con_info = *con_cls;
if (NULL == con_info)
return;
if (con_info->connectiontype == POST)
{
if (NULL != con_info->postprocessor)
{
MHD_destroy_post_processor (con_info->postprocessor);
nr_of_uploading_clients--;
}
if (con_info->fp)
fclose (con_info->fp);
}
free (con_info);
*con_cls = NULL;
}
static int
answer_to_connection (void *cls,
struct MHD_Connection *connection,
const char *url,
const char *method,
const char *version,
const char *upload_data,
size_t *upload_data_size,
void **con_cls)
{
if (NULL == *con_cls)
{
struct connection_info_struct *con_info;
if (nr_of_uploading_clients >= MAXCLIENTS)
return send_page (connection,
busypage,
MHD_HTTP_SERVICE_UNAVAILABLE);
con_info = malloc (sizeof (struct connection_info_struct));
if (NULL == con_info)
return MHD_NO;
con_info->fp = NULL;
if (0 == strcasecmp (method, MHD_HTTP_METHOD_POST))
{
con_info->postprocessor =
MHD_create_post_processor (connection,
POSTBUFFERSIZE,
&iterate_post,
(void *) con_info);
if (NULL == con_info->postprocessor)
{
free (con_info);
return MHD_NO;
}
nr_of_uploading_clients++;
con_info->connectiontype = POST;
con_info->answercode = MHD_HTTP_OK;
con_info->answerstring = completepage;
}
else
con_info->connectiontype = GET;
*con_cls = (void *) con_info;
return MHD_YES;
}
if (0 == strcasecmp (method, MHD_HTTP_METHOD_GET))
{
char buffer[1024];
snprintf (buffer,
sizeof (buffer),
askpage,
nr_of_uploading_clients);
return send_page (connection,
buffer,
MHD_HTTP_OK);
}
if (0 == strcasecmp (method, MHD_HTTP_METHOD_POST))
{
struct connection_info_struct *con_info = *con_cls;
if (0 != *upload_data_size)
{
MHD_post_process (con_info->postprocessor,
upload_data,
*upload_data_size);
*upload_data_size = 0;
return MHD_YES;
}
else
{
if (NULL != con_info->fp)
{
fclose (con_info->fp);
con_info->fp = NULL;
}
/* Now it is safe to open and inspect the file before
calling send_page with a response */
return send_page (connection,
con_info->answerstring,
con_info->answercode);
}
}
return send_page (connection,
errorpage,
MHD_HTTP_BAD_REQUEST);
}
int
main ()
{
struct MHD_Daemon *daemon;
daemon = MHD_start_daemon (MHD_USE_SELECT_INTERNALLY,
PORT, NULL, NULL,
&answer_to_connection, NULL,
MHD_OPTION_NOTIFY_COMPLETED, &request_completed, NULL,
MHD_OPTION_END);
if (NULL == daemon)
return 1;
(void) getchar ();
MHD_stop_daemon (daemon);
return 0;
}
|
