2 This file is part of GNUnet.
3 (C) 2012 Christian Grothoff (and other contributing authors)
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.
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.
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., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
23 * @brief api for the set service
24 * @author Florian Dold
27 #include "gnunet_util_lib.h"
28 #include "gnunet_protocols.h"
29 #include "gnunet_client_lib.h"
30 #include "gnunet_set_service.h"
35 #define LOG(kind,...) GNUNET_log_from (kind, "set-api",__VA_ARGS__)
38 * Opaque handle to a set.
40 struct GNUNET_SET_Handle
42 struct GNUNET_CLIENT_Connection *client;
43 struct GNUNET_MQ_MessageQueue *mq;
44 unsigned int messages_since_ack;
48 * Opaque handle to a set operation request from another peer.
50 struct GNUNET_SET_Request
57 struct GNUNET_SET_OperationHandle
59 GNUNET_SET_ResultIterator result_cb;
61 struct GNUNET_SET_Handle *set;
63 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
68 * Opaque handle to a listen operation.
70 struct GNUNET_SET_ListenHandle
72 struct GNUNET_CLIENT_Connection *client;
73 struct GNUNET_MQ_MessageQueue* mq;
74 GNUNET_SET_ListenCallback listen_cb;
80 * Handle result message for a set operation.
83 * @param mh the message
86 handle_result (void *cls, const struct GNUNET_MessageHeader *mh)
88 struct ResultMessage *msg = (struct ResultMessage *) mh;
89 struct GNUNET_SET_Handle *set = cls;
90 struct GNUNET_SET_OperationHandle *oh;
91 struct GNUNET_SET_Element e;
93 if (set->messages_since_ack >= GNUNET_SET_ACK_WINDOW/2)
95 struct GNUNET_MQ_Message *mqm;
96 mqm = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_SET_ACK);
97 GNUNET_MQ_send (set->mq, mqm);
100 oh = GNUNET_MQ_assoc_get (set->mq, ntohl (msg->request_id));
101 GNUNET_break (NULL != oh);
102 if (GNUNET_SCHEDULER_NO_TASK != oh->timeout_task)
104 GNUNET_SCHEDULER_cancel (oh->timeout_task);
105 oh->timeout_task = GNUNET_SCHEDULER_NO_TASK;
107 if (htons (msg->result_status) != GNUNET_SET_STATUS_OK)
109 if (NULL != oh->result_cb)
110 oh->result_cb (oh->result_cls, NULL, htons (msg->result_status));
111 GNUNET_MQ_assoc_remove (set->mq, ntohl (msg->request_id));
116 e.size = ntohs (mh->size) - sizeof (struct ResultMessage);
117 e.type = msg->element_type;
118 if (NULL != oh->result_cb)
119 oh->result_cb (oh->result_cls, &e, htons (msg->result_status));
123 * Handle request message for a listen operation
125 * @param cls the listen handle
126 * @param mh the message
129 handle_request (void *cls, const struct GNUNET_MessageHeader *mh)
131 struct RequestMessage *msg = (struct RequestMessage *) mh;
132 struct GNUNET_SET_ListenHandle *lh = cls;
133 struct GNUNET_SET_Request *req;
135 req = GNUNET_new (struct GNUNET_SET_Request);
136 req->request_id = ntohl (msg->request_id);
137 lh->listen_cb (lh->listen_cls, &msg->peer_id, &mh[1], req);
138 if (GNUNET_NO == req->accepted)
140 struct GNUNET_MQ_Message *mqm;
141 struct AcceptMessage *amsg;
143 mqm = GNUNET_MQ_msg (amsg, GNUNET_MESSAGE_TYPE_SET_ACCEPT);
144 amsg->request_id = msg->request_id;
145 GNUNET_MQ_send (lh->mq, mqm);
152 * Create an empty set, supporting the specified operation.
154 * @param cfg configuration to use for connecting to the
156 * @param op operation supported by the set
157 * Note that the operation has to be specified
158 * beforehand, as certain set operations need to maintain
159 * data structures spefific to the operation
160 * @return a handle to the set
162 struct GNUNET_SET_Handle *
163 GNUNET_SET_create (const struct GNUNET_CONFIGURATION_Handle *cfg,
164 enum GNUNET_SET_OperationType op)
166 struct GNUNET_SET_Handle *set;
167 struct GNUNET_MQ_Message *mqm;
168 struct SetCreateMessage *msg;
169 static const struct GNUNET_MQ_Handler mq_handlers[] = {
170 {handle_result, GNUNET_MESSAGE_TYPE_SET_RESULT},
171 GNUNET_MQ_HANDLERS_END
174 set = GNUNET_new (struct GNUNET_SET_Handle);
175 set->client = GNUNET_CLIENT_connect ("set", cfg);
176 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "set client created\n");
177 GNUNET_assert (NULL != set->client);
178 set->mq = GNUNET_MQ_queue_for_connection_client (set->client, mq_handlers, set);
179 mqm = GNUNET_MQ_msg (msg, GNUNET_MESSAGE_TYPE_SET_CREATE);
180 msg->operation = htons (op);
181 GNUNET_MQ_send (set->mq, mqm);
187 * Add an element to the given set.
188 * After the element has been added (in the sense of being
189 * transmitted to the set service), cont will be called.
190 * Calls to add_element can be queued
192 * @param set set to add element to
193 * @param element element to add to the set
194 * @param cont continuation called after the element has been added
195 * @param cont_cls closure for cont
198 GNUNET_SET_add_element (struct GNUNET_SET_Handle *set,
199 const struct GNUNET_SET_Element *element,
200 GNUNET_SET_Continuation cont,
203 struct GNUNET_MQ_Message *mqm;
204 struct ElementMessage *msg;
206 mqm = GNUNET_MQ_msg_extra (msg, element->size, GNUNET_MESSAGE_TYPE_SET_ADD);
207 msg->element_type = element->type;
208 memcpy (&msg[1], element->data, element->size);
209 GNUNET_MQ_notify_sent (mqm, cont, cont_cls);
210 GNUNET_MQ_send (set->mq, mqm);
215 * Remove an element to the given set.
216 * After the element has been removed (in the sense of the
217 * request being transmitted to the set service), cont will be called.
218 * Calls to remove_element can be queued
220 * @param set set to remove element from
221 * @param element element to remove from the set
222 * @param cont continuation called after the element has been removed
223 * @param cont_cls closure for cont
226 GNUNET_SET_remove_element (struct GNUNET_SET_Handle *set,
227 const struct GNUNET_SET_Element *element,
228 GNUNET_SET_Continuation cont,
231 struct GNUNET_MQ_Message *mqm;
232 struct ElementMessage *msg;
234 mqm = GNUNET_MQ_msg_extra (msg, element->size, GNUNET_MESSAGE_TYPE_SET_REMOVE);
235 msg->element_type = element->type;
236 memcpy (&msg[1], element->data, element->size);
237 GNUNET_MQ_notify_sent (mqm, cont, cont_cls);
238 GNUNET_MQ_send (set->mq, mqm);
243 * Destroy the set handle, and free all associated resources.
246 GNUNET_SET_destroy (struct GNUNET_SET_Handle *set)
248 GNUNET_CLIENT_disconnect (set->client);
250 GNUNET_MQ_destroy (set->mq);
256 * Signature of the main function of a task.
259 * @param tc context information (why was this task triggered now)
262 operation_timeout_task (void *cls,
263 const struct GNUNET_SCHEDULER_TaskContext * tc)
265 struct GNUNET_SET_OperationHandle *oh = cls;
266 oh->timeout_task = GNUNET_SCHEDULER_NO_TASK;
267 if (NULL != oh->result_cb)
268 oh->result_cb (oh->result_cls, NULL, GNUNET_SET_STATUS_TIMEOUT);
269 oh->result_cb = NULL;
270 oh->result_cls = NULL;
271 GNUNET_SET_operation_cancel (oh);
276 * Evaluate a set operation with our set and the set of another peer.
278 * @param set set to use
279 * @param salt salt for HKDF (explain more here)
280 * @param other_peer peer with the other set
281 * @param app_id hash for the application using the set
282 * @param context_msg additional information for the request
283 * @param salt salt used for the set operation; sometimes set operations
284 * fail due to hash collisions, using a different salt for each operation
285 * makes it harder for an attacker to exploit this
286 * @param timeout result_cb will be called with GNUNET_SET_STATUS_TIMEOUT
287 * if the operation is not done after the specified time
288 * @param result_mode specified how results will be returned,
289 * see 'GNUNET_SET_ResultMode'.
290 * @param result_cb called on error or success
291 * @param result_cls closure for result_cb
292 * @return a handle to cancel the operation
294 struct GNUNET_SET_OperationHandle *
295 GNUNET_SET_evaluate (struct GNUNET_SET_Handle *set,
296 const struct GNUNET_PeerIdentity *other_peer,
297 const struct GNUNET_HashCode *app_id,
298 const struct GNUNET_MessageHeader *context_msg,
300 struct GNUNET_TIME_Relative timeout,
301 enum GNUNET_SET_ResultMode result_mode,
302 GNUNET_SET_ResultIterator result_cb,
305 struct GNUNET_MQ_Message *mqm;
306 struct EvaluateMessage *msg;
307 struct GNUNET_SET_OperationHandle *oh;
309 oh = GNUNET_new (struct GNUNET_SET_OperationHandle);
310 oh->result_cb = result_cb;
311 oh->result_cls = result_cls;
314 mqm = GNUNET_MQ_msg (msg, GNUNET_MESSAGE_TYPE_SET_EVALUATE);
315 msg->request_id = htonl (GNUNET_MQ_assoc_add (set->mq, mqm, oh));
316 msg->peer = *other_peer;
317 msg->app_id = *app_id;
319 if (NULL != context_msg)
320 if (GNUNET_OK != GNUNET_MQ_nest (mqm, context_msg, ntohs (context_msg->size)))
323 oh->timeout_task = GNUNET_SCHEDULER_add_delayed (timeout, operation_timeout_task, oh);
324 GNUNET_MQ_send (set->mq, mqm);
331 * Wait for set operation requests for the given application id
333 * @param cfg configuration to use for connecting to
335 * @param operation operation we want to listen for
336 * @param app_id id of the application that handles set operation requests
337 * @param listen_cb called for each incoming request matching the operation
339 * @param listen_cls handle for listen_cb
340 * @return a handle that can be used to cancel the listen operation
342 struct GNUNET_SET_ListenHandle *
343 GNUNET_SET_listen (const struct GNUNET_CONFIGURATION_Handle *cfg,
344 enum GNUNET_SET_OperationType operation,
345 const struct GNUNET_HashCode *app_id,
346 GNUNET_SET_ListenCallback listen_cb,
349 struct GNUNET_SET_ListenHandle *lh;
350 struct GNUNET_MQ_Message *mqm;
351 struct ListenMessage *msg;
352 static const struct GNUNET_MQ_Handler mq_handlers[] = {
353 {handle_request, GNUNET_MESSAGE_TYPE_SET_REQUEST},
354 GNUNET_MQ_HANDLERS_END
357 lh = GNUNET_new (struct GNUNET_SET_ListenHandle);
358 lh->client = GNUNET_CLIENT_connect ("set", cfg);
359 lh->listen_cb = listen_cb;
360 lh->listen_cls = listen_cls;
361 GNUNET_assert (NULL != lh->client);
362 lh->mq = GNUNET_MQ_queue_for_connection_client (lh->client, mq_handlers, lh);
363 mqm = GNUNET_MQ_msg (msg, GNUNET_MESSAGE_TYPE_SET_LISTEN);
364 msg->operation = htons (operation);
365 msg->app_id = *app_id;
366 GNUNET_MQ_send (lh->mq, mqm);
373 * Cancel the given listen operation.
375 * @param lh handle for the listen operation
378 GNUNET_SET_listen_cancel (struct GNUNET_SET_ListenHandle *lh)
380 GNUNET_MQ_destroy (lh->mq);
382 GNUNET_CLIENT_disconnect (lh->client);
384 lh->listen_cb = NULL;
385 lh->listen_cls = NULL;
390 * Accept a request we got via GNUNET_SET_listen.
392 * @param request request to accept
393 * @param set set used for the requested operation
394 * @param timeout timeout for the set operation
395 * @param result_mode specified how results will be returned,
396 * see 'GNUNET_SET_ResultMode'.
397 * @param result_cb callback for the results
398 * @param result_cls closure for result_cb
399 * @return a handle to cancel the operation
401 struct GNUNET_SET_OperationHandle *
402 GNUNET_SET_accept (struct GNUNET_SET_Request *request,
403 struct GNUNET_SET_Handle *set,
404 struct GNUNET_TIME_Relative timeout,
405 enum GNUNET_SET_ResultMode result_mode,
406 GNUNET_SET_ResultIterator result_cb,
409 struct GNUNET_MQ_Message *mqm;
410 struct AcceptMessage *msg;
411 struct GNUNET_SET_OperationHandle *oh;
413 /* don't accept a request twice! */
414 GNUNET_assert (GNUNET_NO == request->accepted);
415 request->accepted = GNUNET_YES;
417 oh = GNUNET_new (struct GNUNET_SET_OperationHandle);
418 oh->result_cb = result_cb;
419 oh->result_cls = result_cls;
422 mqm = GNUNET_MQ_msg (msg , GNUNET_MESSAGE_TYPE_SET_ACCEPT);
423 msg->request_id = htonl (request->request_id);
425 GNUNET_MQ_send (set->mq, mqm);
427 oh->timeout_task = GNUNET_SCHEDULER_add_delayed (timeout, operation_timeout_task, oh);
434 * Cancel the given set operation.
436 * @param oh set operation to cancel
439 GNUNET_SET_operation_cancel (struct GNUNET_SET_OperationHandle *oh)
441 struct GNUNET_MQ_Message *mqm;
442 struct GNUNET_SET_OperationHandle *h_assoc;
444 h_assoc = GNUNET_MQ_assoc_remove (oh->set->mq, oh->request_id);
445 GNUNET_assert (h_assoc == oh);
446 mqm = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_SET_CANCEL);
447 GNUNET_MQ_send (oh->set->mq, mqm);