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
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
|
/*
This file is part of TALER
Copyright (C) 2014--2020 Taler Systems SA
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License along with
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file mhd_parsing.c
* @brief functions to parse incoming requests (MHD arguments and JSON snippets)
* @author Florian Dold
* @author Benedikt Mueller
* @author Christian Grothoff
*/
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_json_lib.h>
#include "taler_json_lib.h"
#include "taler_mhd_lib.h"
enum GNUNET_GenericReturnValue
TALER_MHD_parse_post_json (struct MHD_Connection *connection,
void **con_cls,
const char *upload_data,
size_t *upload_data_size,
json_t **json)
{
enum GNUNET_JSON_PostResult pr;
pr = GNUNET_JSON_post_parser (TALER_MHD_REQUEST_BUFFER_MAX,
connection,
con_cls,
upload_data,
upload_data_size,
json);
switch (pr)
{
case GNUNET_JSON_PR_OUT_OF_MEMORY:
GNUNET_break (NULL == *json);
return (MHD_NO ==
TALER_MHD_reply_with_error (
connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_GENERIC_PARSER_OUT_OF_MEMORY,
NULL)) ? GNUNET_SYSERR : GNUNET_NO;
case GNUNET_JSON_PR_CONTINUE:
GNUNET_break (NULL == *json);
return GNUNET_YES;
case GNUNET_JSON_PR_REQUEST_TOO_LARGE:
GNUNET_break (NULL == *json);
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Closing connection, upload too large\n");
return GNUNET_SYSERR;
case GNUNET_JSON_PR_JSON_INVALID:
GNUNET_break (NULL == *json);
return (MHD_YES ==
TALER_MHD_reply_with_error (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_GENERIC_JSON_INVALID,
NULL))
? GNUNET_NO : GNUNET_SYSERR;
case GNUNET_JSON_PR_SUCCESS:
GNUNET_break (NULL != *json);
return GNUNET_YES;
}
/* this should never happen */
GNUNET_break (0);
return GNUNET_SYSERR;
}
void
TALER_MHD_parse_post_cleanup_callback (void *con_cls)
{
GNUNET_JSON_post_parser_cleanup (con_cls);
}
/**
* Extract fixed-size base32crockford encoded data from request.
*
* Queues an error response to the connection if the parameter is missing or
* invalid.
*
* @param connection the MHD connection
* @param param_name the name of the HTTP key with the value
* @param kind whether to extract from header, argument or footer
* @param[out] out_data pointer to store the result
* @param out_size expected size of @a out_data
* @param[out] present set to true if argument was found
* @return
* #GNUNET_YES if the the argument is present
* #GNUNET_NO if the argument is absent or malformed
* #GNUNET_SYSERR on internal error (error response could not be sent)
*/
static enum GNUNET_GenericReturnValue
parse_request_data (struct MHD_Connection *connection,
const char *param_name,
enum MHD_ValueKind kind,
void *out_data,
size_t out_size,
bool *present)
{
const char *str;
str = MHD_lookup_connection_value (connection,
kind,
param_name);
if (NULL == str)
{
*present = false;
return GNUNET_OK;
}
if (GNUNET_OK !=
GNUNET_STRINGS_string_to_data (str,
strlen (str),
out_data,
out_size))
return (MHD_NO ==
TALER_MHD_reply_with_error (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_GENERIC_PARAMETER_MALFORMED,
param_name))
? GNUNET_SYSERR : GNUNET_NO;
*present = true;
return GNUNET_OK;
}
enum GNUNET_GenericReturnValue
TALER_MHD_parse_request_arg_data (struct MHD_Connection *connection,
const char *param_name,
void *out_data,
size_t out_size,
bool *present)
{
return parse_request_data (connection,
param_name,
MHD_GET_ARGUMENT_KIND,
out_data,
out_size,
present);
}
enum GNUNET_GenericReturnValue
TALER_MHD_parse_request_header_data (struct MHD_Connection *connection,
const char *header_name,
void *out_data,
size_t out_size,
bool *present)
{
return parse_request_data (connection,
header_name,
MHD_HEADER_KIND,
out_data,
out_size,
present);
}
enum GNUNET_GenericReturnValue
TALER_MHD_parse_request_arg_timeout (struct MHD_Connection *connection,
struct GNUNET_TIME_Absolute *expiration)
{
const char *ts;
char dummy;
unsigned long long tms;
ts = MHD_lookup_connection_value (connection,
MHD_GET_ARGUMENT_KIND,
"timeout_ms");
if (NULL == ts)
{
*expiration = GNUNET_TIME_UNIT_ZERO_ABS;
return GNUNET_OK;
}
if (1 !=
sscanf (ts,
"%llu%c",
&tms,
&dummy))
{
MHD_RESULT mret;
GNUNET_break_op (0);
mret = TALER_MHD_reply_with_error (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_GENERIC_PARAMETER_MALFORMED,
"timeout_ms");
return (MHD_YES == mret)
? GNUNET_NO
: GNUNET_SYSERR;
}
*expiration = GNUNET_TIME_relative_to_absolute (
GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
tms));
return GNUNET_OK;
}
enum GNUNET_GenericReturnValue
TALER_MHD_parse_json_data (struct MHD_Connection *connection,
const json_t *root,
struct GNUNET_JSON_Specification *spec)
{
enum GNUNET_GenericReturnValue ret;
const char *error_json_name;
unsigned int error_line;
ret = GNUNET_JSON_parse (root,
spec,
&error_json_name,
&error_line);
if (GNUNET_SYSERR == ret)
{
if (NULL == error_json_name)
error_json_name = "<no field>";
ret = (MHD_YES ==
TALER_MHD_REPLY_JSON_PACK (
connection,
MHD_HTTP_BAD_REQUEST,
GNUNET_JSON_pack_string ("hint",
TALER_ErrorCode_get_hint (
TALER_EC_GENERIC_JSON_INVALID)),
GNUNET_JSON_pack_uint64 ("code",
TALER_EC_GENERIC_JSON_INVALID),
GNUNET_JSON_pack_string ("field",
error_json_name),
GNUNET_JSON_pack_uint64 ("line",
error_line)))
? GNUNET_NO : GNUNET_SYSERR;
return ret;
}
return GNUNET_YES;
}
enum GNUNET_GenericReturnValue
TALER_MHD_parse_internal_json_data (struct MHD_Connection *connection,
const json_t *root,
struct GNUNET_JSON_Specification *spec)
{
enum GNUNET_GenericReturnValue ret;
const char *error_json_name;
unsigned int error_line;
ret = GNUNET_JSON_parse (root,
spec,
&error_json_name,
&error_line);
if (GNUNET_SYSERR == ret)
{
if (NULL == error_json_name)
error_json_name = "<no field>";
ret = (MHD_YES ==
TALER_MHD_REPLY_JSON_PACK (
connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
GNUNET_JSON_pack_string ("hint",
TALER_ErrorCode_get_hint (
TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE)),
GNUNET_JSON_pack_uint64 ("code",
TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE),
GNUNET_JSON_pack_string ("field",
error_json_name),
GNUNET_JSON_pack_uint64 ("line",
error_line)))
? GNUNET_NO : GNUNET_SYSERR;
return ret;
}
return GNUNET_YES;
}
enum GNUNET_GenericReturnValue
TALER_MHD_parse_json_array (struct MHD_Connection *connection,
const json_t *root,
struct GNUNET_JSON_Specification *spec,
...)
{
enum GNUNET_GenericReturnValue ret;
const char *error_json_name;
unsigned int error_line;
va_list ap;
json_int_t dim;
va_start (ap, spec);
dim = 0;
while ( (-1 != (ret = va_arg (ap, int))) &&
(NULL != root) )
{
dim++;
root = json_array_get (root, ret);
}
va_end (ap);
if (NULL == root)
{
ret = (MHD_YES ==
TALER_MHD_REPLY_JSON_PACK (
connection,
MHD_HTTP_BAD_REQUEST,
GNUNET_JSON_pack_string ("hint",
TALER_ErrorCode_get_hint (
TALER_EC_GENERIC_JSON_INVALID)),
GNUNET_JSON_pack_uint64 ("code",
TALER_EC_GENERIC_JSON_INVALID),
GNUNET_JSON_pack_string ("detail",
"expected array"),
GNUNET_JSON_pack_uint64 ("dimension",
dim)))
? GNUNET_NO : GNUNET_SYSERR;
return ret;
}
ret = GNUNET_JSON_parse (root,
spec,
&error_json_name,
&error_line);
if (GNUNET_SYSERR == ret)
{
if (NULL == error_json_name)
error_json_name = "<no field>";
ret = (MHD_YES ==
TALER_MHD_REPLY_JSON_PACK (
connection,
MHD_HTTP_BAD_REQUEST,
GNUNET_JSON_pack_string ("detail",
error_json_name),
GNUNET_JSON_pack_string ("hint",
TALER_ErrorCode_get_hint (
TALER_EC_GENERIC_JSON_INVALID)),
GNUNET_JSON_pack_uint64 ("code",
TALER_EC_GENERIC_JSON_INVALID),
GNUNET_JSON_pack_uint64 ("line",
error_line)))
? GNUNET_NO : GNUNET_SYSERR;
return ret;
}
return GNUNET_YES;
}
enum GNUNET_GenericReturnValue
TALER_MHD_check_content_length_ (struct MHD_Connection *connection,
unsigned long long max_len)
{
const char *cl;
unsigned long long cv;
char dummy;
/* Maybe check for maximum upload size
and refuse requests if they are just too big. */
cl = MHD_lookup_connection_value (connection,
MHD_HEADER_KIND,
MHD_HTTP_HEADER_CONTENT_LENGTH);
if (NULL == cl)
{
GNUNET_break_op (0);
return (MHD_YES ==
TALER_MHD_reply_with_error (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_GENERIC_PARAMETER_MISSING,
MHD_HTTP_HEADER_CONTENT_LENGTH))
? GNUNET_NO
: GNUNET_SYSERR;
}
if (1 != sscanf (cl,
"%llu%c",
&cv,
&dummy))
{
/* Not valid HTTP request, just close connection. */
GNUNET_break_op (0);
return (MHD_YES ==
TALER_MHD_reply_with_error (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_GENERIC_PARAMETER_MALFORMED,
MHD_HTTP_HEADER_CONTENT_LENGTH))
? GNUNET_NO
: GNUNET_SYSERR;
}
if (cv > TALER_MHD_REQUEST_BUFFER_MAX)
{
GNUNET_break_op (0);
return (MHD_YES ==
TALER_MHD_reply_request_too_large (connection))
? GNUNET_NO
: GNUNET_SYSERR;
}
return GNUNET_OK;
}
/* end of mhd_parsing.c */
|
