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author | Martin Schanzenbach <mschanzenbach@posteo.de> | 2016-11-10 20:35:04 +0100 |
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committer | Martin Schanzenbach <mschanzenbach@posteo.de> | 2016-11-10 20:45:55 +0100 |
commit | 39981eee3163a1795026e8670ac5b669426f268b (patch) | |
tree | 8807df6deb2ed969ec951f77927b1b27d139d17f /src/credential/credential_api.c | |
parent | 60585eacf2735c86b40effaed8614eff2643d6f9 (diff) | |
download | gnunet-39981eee3163a1795026e8670ac5b669426f268b.tar.gz gnunet-39981eee3163a1795026e8670ac5b669426f268b.zip |
add credential
Diffstat (limited to 'src/credential/credential_api.c')
-rw-r--r-- | src/credential/credential_api.c | 410 |
1 files changed, 410 insertions, 0 deletions
diff --git a/src/credential/credential_api.c b/src/credential/credential_api.c new file mode 100644 index 000000000..1efe2d089 --- /dev/null +++ b/src/credential/credential_api.c | |||
@@ -0,0 +1,410 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet. | ||
3 | Copyright (C) 2009-2013, 2016 GNUnet e.V. | ||
4 | |||
5 | GNUnet is free software; you can redistribute it and/or modify | ||
6 | it under the terms of the GNU General Public License as published | ||
7 | by the Free Software Foundation; either version 3, or (at your | ||
8 | option) any later version. | ||
9 | |||
10 | GNUnet is distributed in the hope that it will be useful, but | ||
11 | WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
13 | General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU General Public License | ||
16 | along with GNUnet; see the file COPYING. If not, write to the | ||
17 | Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | ||
18 | Boston, MA 02110-1301, USA. | ||
19 | */ | ||
20 | /** | ||
21 | * @file credential/credential_api.c | ||
22 | * @brief library to access the CREDENTIAL service | ||
23 | * @author Adnan Husain | ||
24 | */ | ||
25 | #include "platform.h" | ||
26 | #include "gnunet_util_lib.h" | ||
27 | #include "gnunet_constants.h" | ||
28 | #include "gnunet_arm_service.h" | ||
29 | #include "gnunet_hello_lib.h" | ||
30 | #include "gnunet_protocols.h" | ||
31 | #include "credential.h" | ||
32 | #include "gnunet_credential_service.h" | ||
33 | #include "gnunet_identity_service.h" | ||
34 | |||
35 | |||
36 | #define LOG(kind,...) GNUNET_log_from (kind, "credential-api",__VA_ARGS__) | ||
37 | |||
38 | /** | ||
39 | * Handle to a lookup request | ||
40 | */ | ||
41 | struct GNUNET_CREDENTIAL_LookupRequest | ||
42 | { | ||
43 | |||
44 | /** | ||
45 | * DLL | ||
46 | */ | ||
47 | struct GNUNET_CREDENTIAL_LookupRequest *next; | ||
48 | |||
49 | /** | ||
50 | * DLL | ||
51 | */ | ||
52 | struct GNUNET_CREDENTIAL_LookupRequest *prev; | ||
53 | |||
54 | /** | ||
55 | * handle to credential service | ||
56 | */ | ||
57 | struct GNUNET_CREDENTIAL_Handle *credential_handle; | ||
58 | |||
59 | /** | ||
60 | * processor to call on lookup result | ||
61 | */ | ||
62 | GNUNET_CREDENTIAL_LookupResultProcessor lookup_proc; | ||
63 | |||
64 | /** | ||
65 | * @e lookup_proc closure | ||
66 | */ | ||
67 | void *proc_cls; | ||
68 | |||
69 | /** | ||
70 | * Envelope with the message for this queue entry. | ||
71 | */ | ||
72 | struct GNUNET_MQ_Envelope *env; | ||
73 | |||
74 | /** | ||
75 | * request id | ||
76 | */ | ||
77 | uint32_t r_id; | ||
78 | |||
79 | }; | ||
80 | |||
81 | |||
82 | /** | ||
83 | * Connection to the CREDENTIAL service. | ||
84 | */ | ||
85 | struct GNUNET_CREDENTIAL_Handle | ||
86 | { | ||
87 | |||
88 | /** | ||
89 | * Configuration to use. | ||
90 | */ | ||
91 | const struct GNUNET_CONFIGURATION_Handle *cfg; | ||
92 | |||
93 | /** | ||
94 | * Connection to service (if available). | ||
95 | */ | ||
96 | struct GNUNET_MQ_Handle *mq; | ||
97 | |||
98 | /** | ||
99 | * Head of linked list of active lookup requests. | ||
100 | */ | ||
101 | struct GNUNET_CREDENTIAL_LookupRequest *lookup_head; | ||
102 | |||
103 | /** | ||
104 | * Tail of linked list of active lookup requests. | ||
105 | */ | ||
106 | struct GNUNET_CREDENTIAL_LookupRequest *lookup_tail; | ||
107 | |||
108 | /** | ||
109 | * Reconnect task | ||
110 | */ | ||
111 | struct GNUNET_SCHEDULER_Task *reconnect_task; | ||
112 | |||
113 | /** | ||
114 | * How long do we wait until we try to reconnect? | ||
115 | */ | ||
116 | struct GNUNET_TIME_Relative reconnect_backoff; | ||
117 | |||
118 | /** | ||
119 | * Request Id generator. Incremented by one for each request. | ||
120 | */ | ||
121 | uint32_t r_id_gen; | ||
122 | |||
123 | }; | ||
124 | |||
125 | |||
126 | /** | ||
127 | * Reconnect to CREDENTIAL service. | ||
128 | * | ||
129 | * @param handle the handle to the CREDENTIAL service | ||
130 | */ | ||
131 | static void | ||
132 | reconnect (struct GNUNET_CREDENTIAL_Handle *handle); | ||
133 | |||
134 | |||
135 | /** | ||
136 | * Reconnect to CREDENTIAL | ||
137 | * | ||
138 | * @param cls the handle | ||
139 | */ | ||
140 | static void | ||
141 | reconnect_task (void *cls) | ||
142 | { | ||
143 | struct GNUNET_CREDENTIAL_Handle *handle = cls; | ||
144 | |||
145 | handle->reconnect_task = NULL; | ||
146 | reconnect (handle); | ||
147 | } | ||
148 | |||
149 | |||
150 | /** | ||
151 | * Disconnect from service and then reconnect. | ||
152 | * | ||
153 | * @param handle our handle | ||
154 | */ | ||
155 | static void | ||
156 | force_reconnect (struct GNUNET_CREDENTIAL_Handle *handle) | ||
157 | { | ||
158 | GNUNET_MQ_destroy (handle->mq); | ||
159 | handle->mq = NULL; | ||
160 | handle->reconnect_backoff | ||
161 | = GNUNET_TIME_STD_BACKOFF (handle->reconnect_backoff); | ||
162 | handle->reconnect_task | ||
163 | = GNUNET_SCHEDULER_add_delayed (handle->reconnect_backoff, | ||
164 | &reconnect_task, | ||
165 | handle); | ||
166 | } | ||
167 | |||
168 | |||
169 | /** | ||
170 | * Generic error handler, called with the appropriate error code and | ||
171 | * the same closure specified at the creation of the message queue. | ||
172 | * Not every message queue implementation supports an error handler. | ||
173 | * | ||
174 | * @param cls closure with the `struct GNUNET_CREDENTIAL_Handle *` | ||
175 | * @param error error code | ||
176 | */ | ||
177 | static void | ||
178 | mq_error_handler (void *cls, | ||
179 | enum GNUNET_MQ_Error error) | ||
180 | { | ||
181 | struct GNUNET_CREDENTIAL_Handle *handle = cls; | ||
182 | |||
183 | force_reconnect (handle); | ||
184 | } | ||
185 | |||
186 | |||
187 | /** | ||
188 | * Check validity of message received from the CREDENTIAL service | ||
189 | * | ||
190 | * @param cls the `struct GNUNET_CREDENTIAL_Handle *` | ||
191 | * @param loookup_msg the incoming message | ||
192 | */ | ||
193 | static int | ||
194 | check_result (void *cls, | ||
195 | const struct LookupResultMessage *lookup_msg) | ||
196 | { | ||
197 | //TODO | ||
198 | return GNUNET_OK; | ||
199 | } | ||
200 | |||
201 | |||
202 | /** | ||
203 | * Handler for messages received from the CREDENTIAL service | ||
204 | * | ||
205 | * @param cls the `struct GNUNET_CREDENTIAL_Handle *` | ||
206 | * @param loookup_msg the incoming message | ||
207 | */ | ||
208 | static void | ||
209 | handle_result (void *cls, | ||
210 | const struct LookupResultMessage *lookup_msg) | ||
211 | { | ||
212 | struct GNUNET_CREDENTIAL_Handle *handle = cls; | ||
213 | uint32_t cd_count = ntohl (lookup_msg->cd_count); | ||
214 | struct GNUNET_CREDENTIAL_RecordData cd[cd_count]; | ||
215 | uint32_t r_id = ntohl (lookup_msg->id); | ||
216 | struct GNUNET_CREDENTIAL_LookupRequest *lr; | ||
217 | GNUNET_CREDENTIAL_LookupResultProcessor proc; | ||
218 | void *proc_cls; | ||
219 | |||
220 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
221 | "Received lookup reply from CREDENTIAL service (%u credentials)\n", | ||
222 | (unsigned int) cd_count); | ||
223 | for (lr = handle->lookup_head; NULL != lr; lr = lr->next) | ||
224 | if (lr->r_id == r_id) | ||
225 | break; | ||
226 | if (NULL == lr) | ||
227 | return; | ||
228 | proc = lr->lookup_proc; | ||
229 | proc_cls = lr->proc_cls; | ||
230 | GNUNET_CONTAINER_DLL_remove (handle->lookup_head, | ||
231 | handle->lookup_tail, | ||
232 | lr); | ||
233 | GNUNET_free (lr); | ||
234 | /** | ||
235 | GNUNET_assert (GNUNET_OK == | ||
236 | GNUNET_CREDENTIAL_records_deserialize (mlen, | ||
237 | (const char*) &lookup_msg[1], | ||
238 | rd_count, | ||
239 | rd)); | ||
240 | */ | ||
241 | proc (proc_cls, | ||
242 | NULL, | ||
243 | cd_count, | ||
244 | cd); // TODO | ||
245 | } | ||
246 | |||
247 | |||
248 | /** | ||
249 | * Reconnect to CREDENTIAL service. | ||
250 | * | ||
251 | * @param handle the handle to the CREDENTIAL service | ||
252 | */ | ||
253 | static void | ||
254 | reconnect (struct GNUNET_CREDENTIAL_Handle *handle) | ||
255 | { | ||
256 | struct GNUNET_MQ_MessageHandler handlers[] = { | ||
257 | GNUNET_MQ_hd_var_size (result, | ||
258 | GNUNET_MESSAGE_TYPE_CREDENTIAL_LOOKUP_RESULT, | ||
259 | struct LookupResultMessage, | ||
260 | NULL), | ||
261 | GNUNET_MQ_handler_end () | ||
262 | }; | ||
263 | struct GNUNET_CREDENTIAL_LookupRequest *lh; | ||
264 | |||
265 | GNUNET_assert (NULL == handle->mq); | ||
266 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
267 | "Trying to connect to CREDENTIAL\n"); | ||
268 | handle->mq = GNUNET_CLIENT_connecT (handle->cfg, | ||
269 | "credential", | ||
270 | handlers, | ||
271 | &mq_error_handler, | ||
272 | handle); | ||
273 | if (NULL == handle->mq) | ||
274 | return; | ||
275 | for (lh = handle->lookup_head; NULL != lh; lh = lh->next) | ||
276 | GNUNET_MQ_send_copy (handle->mq, | ||
277 | lh->env); | ||
278 | } | ||
279 | |||
280 | |||
281 | /** | ||
282 | * Initialize the connection with the CREDENTIAL service. | ||
283 | * | ||
284 | * @param cfg configuration to use | ||
285 | * @return handle to the CREDENTIAL service, or NULL on error | ||
286 | */ | ||
287 | struct GNUNET_CREDENTIAL_Handle * | ||
288 | GNUNET_CREDENTIAL_connect (const struct GNUNET_CONFIGURATION_Handle *cfg) | ||
289 | { | ||
290 | struct GNUNET_CREDENTIAL_Handle *handle; | ||
291 | |||
292 | handle = GNUNET_new (struct GNUNET_CREDENTIAL_Handle); | ||
293 | handle->cfg = cfg; | ||
294 | reconnect (handle); | ||
295 | if (NULL == handle->mq) | ||
296 | { | ||
297 | GNUNET_free (handle); | ||
298 | return NULL; | ||
299 | } | ||
300 | return handle; | ||
301 | } | ||
302 | |||
303 | |||
304 | /** | ||
305 | * Shutdown connection with the CREDENTIAL service. | ||
306 | * | ||
307 | * @param handle handle of the CREDENTIAL connection to stop | ||
308 | */ | ||
309 | void | ||
310 | GNUNET_CREDENTIAL_disconnect (struct GNUNET_CREDENTIAL_Handle *handle) | ||
311 | { | ||
312 | if (NULL != handle->mq) | ||
313 | { | ||
314 | GNUNET_MQ_destroy (handle->mq); | ||
315 | handle->mq = NULL; | ||
316 | } | ||
317 | if (NULL != handle->reconnect_task) | ||
318 | { | ||
319 | GNUNET_SCHEDULER_cancel (handle->reconnect_task); | ||
320 | handle->reconnect_task = NULL; | ||
321 | } | ||
322 | GNUNET_assert (NULL == handle->lookup_head); | ||
323 | GNUNET_free (handle); | ||
324 | } | ||
325 | |||
326 | |||
327 | /** | ||
328 | * Cancel pending lookup request | ||
329 | * | ||
330 | * @param lr the lookup request to cancel | ||
331 | */ | ||
332 | void | ||
333 | GNUNET_CREDENTIAL_lookup_cancel (struct GNUNET_CREDENTIAL_LookupRequest *lr) | ||
334 | { | ||
335 | struct GNUNET_CREDENTIAL_Handle *handle = lr->credential_handle; | ||
336 | |||
337 | GNUNET_CONTAINER_DLL_remove (handle->lookup_head, | ||
338 | handle->lookup_tail, | ||
339 | lr); | ||
340 | GNUNET_MQ_discard (lr->env); | ||
341 | GNUNET_free (lr); | ||
342 | } | ||
343 | |||
344 | |||
345 | /** | ||
346 | * Perform an asynchronous lookup operation for a credential. | ||
347 | * | ||
348 | * @param handle handle to the Credential service | ||
349 | * @param credential the credential to look up | ||
350 | * @param subject Ego to check the credential for | ||
351 | * @param proc function to call on result | ||
352 | * @param proc_cls closure for processor | ||
353 | * @return handle to the queued request | ||
354 | */ | ||
355 | struct GNUNET_CREDENTIAL_LookupRequest* | ||
356 | GNUNET_CREDENTIAL_lookup (struct GNUNET_CREDENTIAL_Handle *handle, | ||
357 | const char *credential, | ||
358 | const struct GNUNET_IDENTITY_Ego *subject, | ||
359 | const struct GNUNET_CRYPTO_EcdsaPublicKey *subject_key, | ||
360 | const struct GNUNET_CRYPTO_EcdsaPublicKey *issuer_key, | ||
361 | uint32_t credential_flags, | ||
362 | uint32_t max_delegation_depth, | ||
363 | GNUNET_CREDENTIAL_LookupResultProcessor proc, | ||
364 | void *proc_cls) | ||
365 | { | ||
366 | /* IPC to shorten credential names, return shorten_handle */ | ||
367 | struct LookupMessage *lookup_msg; | ||
368 | struct GNUNET_CREDENTIAL_LookupRequest *lr; | ||
369 | size_t nlen; | ||
370 | |||
371 | if (NULL == credential) | ||
372 | { | ||
373 | GNUNET_break (0); | ||
374 | return NULL; | ||
375 | } | ||
376 | //DEBUG LOG | ||
377 | LOG (GNUNET_ERROR_TYPE_DEBUG, | ||
378 | "Trying to lookup `%s' in CREDENTIAL\n", | ||
379 | credential); | ||
380 | nlen = strlen (credential) + 1; | ||
381 | if (nlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (*lr)) | ||
382 | { | ||
383 | GNUNET_break (0); | ||
384 | return NULL; | ||
385 | } | ||
386 | lr = GNUNET_new (struct GNUNET_CREDENTIAL_LookupRequest); | ||
387 | lr->credential_handle = handle; | ||
388 | lr->lookup_proc = proc; | ||
389 | lr->proc_cls = proc_cls; | ||
390 | lr->r_id = handle->r_id_gen++; | ||
391 | lr->env = GNUNET_MQ_msg_extra (lookup_msg, | ||
392 | nlen, | ||
393 | GNUNET_MESSAGE_TYPE_CREDENTIAL_LOOKUP); | ||
394 | lookup_msg->id = htonl (lr->r_id); | ||
395 | lookup_msg->subject_key = *subject_key; | ||
396 | lookup_msg->issuer_key = *issuer_key; | ||
397 | GNUNET_memcpy (&lookup_msg[1], | ||
398 | credential, | ||
399 | nlen); | ||
400 | GNUNET_CONTAINER_DLL_insert (handle->lookup_head, | ||
401 | handle->lookup_tail, | ||
402 | lr); | ||
403 | if (NULL != handle->mq) | ||
404 | GNUNET_MQ_send_copy (handle->mq, | ||
405 | lr->env); | ||
406 | return lr; | ||
407 | } | ||
408 | |||
409 | |||
410 | /* end of credential_api.c */ | ||