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diff --git a/src/dht/gnunet-service-dht_clients.c b/src/dht/gnunet-service-dht_clients.c
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1/*
2 This file is part of GNUnet.
3 Copyright (C) 2009, 2010, 2011, 2016, 2017 GNUnet e.V.
4
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your 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 Affero General Public License for more details.
14
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17
18 SPDX-License-Identifier: AGPL3.0-or-later
19 */
20
21/**
22 * @file dht/gnunet-service-dht_clients.c
23 * @brief GNUnet DHT service's client management code
24 * @author Christian Grothoff
25 * @author Nathan Evans
26 */
27
28#include "platform.h"
29#include "gnunet_constants.h"
30#include "gnunet_protocols.h"
31#include "gnunet_statistics_service.h"
32#include "gnunet-service-dht.h"
33#include "gnunet-service-dht_datacache.h"
34#include "gnunet-service-dht_neighbours.h"
35#include "dht.h"
36
37
38/**
39 * Should routing details be logged to stderr (for debugging)?
40 */
41#define LOG_TRAFFIC(kind, ...) GNUNET_log_from (kind, "dht-traffic", \
42 __VA_ARGS__)
43
44#define LOG(kind, ...) GNUNET_log_from (kind, "dht-clients", __VA_ARGS__)
45
46
47/**
48 * Struct containing information about a client,
49 * handle to connect to it, and any pending messages
50 * that need to be sent to it.
51 */
52struct ClientHandle;
53
54
55/**
56 * Entry in the local forwarding map for a client's GET request.
57 */
58struct ClientQueryRecord
59{
60 /**
61 * The key this request was about
62 */
63 struct GNUNET_HashCode key;
64
65 /**
66 * Kept in a DLL with @e client.
67 */
68 struct ClientQueryRecord *next;
69
70 /**
71 * Kept in a DLL with @e client.
72 */
73 struct ClientQueryRecord *prev;
74
75 /**
76 * Client responsible for the request.
77 */
78 struct ClientHandle *ch;
79
80 /**
81 * Extended query (see gnunet_block_lib.h), allocated at the end of this struct.
82 */
83 const void *xquery;
84
85 /**
86 * Replies we have already seen for this request.
87 */
88 struct GNUNET_HashCode *seen_replies;
89
90 /**
91 * Pointer to this nodes heap location in the retry-heap (for fast removal)
92 */
93 struct GNUNET_CONTAINER_HeapNode *hnode;
94
95 /**
96 * What's the delay between re-try operations that we currently use for this
97 * request?
98 */
99 struct GNUNET_TIME_Relative retry_frequency;
100
101 /**
102 * What's the next time we should re-try this request?
103 */
104 struct GNUNET_TIME_Absolute retry_time;
105
106 /**
107 * The unique identifier of this request
108 */
109 uint64_t unique_id;
110
111 /**
112 * Number of bytes in xquery.
113 */
114 size_t xquery_size;
115
116 /**
117 * Number of entries in 'seen_replies'.
118 */
119 unsigned int seen_replies_count;
120
121 /**
122 * Desired replication level
123 */
124 uint32_t replication;
125
126 /**
127 * Any message options for this request
128 */
129 uint32_t msg_options;
130
131 /**
132 * The type for the data for the GET request.
133 */
134 enum GNUNET_BLOCK_Type type;
135};
136
137
138/**
139 * Struct containing parameters of monitoring requests.
140 */
141struct ClientMonitorRecord
142{
143 /**
144 * Next element in DLL.
145 */
146 struct ClientMonitorRecord *next;
147
148 /**
149 * Previous element in DLL.
150 */
151 struct ClientMonitorRecord *prev;
152
153 /**
154 * Type of blocks that are of interest
155 */
156 enum GNUNET_BLOCK_Type type;
157
158 /**
159 * Key of data of interest, NULL for all.
160 */
161 struct GNUNET_HashCode *key;
162
163 /**
164 * Flag whether to notify about GET messages.
165 */
166 int16_t get;
167
168 /**
169 * Flag whether to notify about GET_REPONSE messages.
170 */
171 int16_t get_resp;
172
173 /**
174 * Flag whether to notify about PUT messages.
175 */
176 uint16_t put;
177
178 /**
179 * Client to notify of these requests.
180 */
181 struct ClientHandle *ch;
182};
183
184
185/**
186 * Struct containing information about a client,
187 * handle to connect to it, and any pending messages
188 * that need to be sent to it.
189 */
190struct ClientHandle
191{
192 /**
193 * Linked list of active queries of this client.
194 */
195 struct ClientQueryRecord *cqr_head;
196
197 /**
198 * Linked list of active queries of this client.
199 */
200 struct ClientQueryRecord *cqr_tail;
201
202 /**
203 * The handle to this client
204 */
205 struct GNUNET_SERVICE_Client *client;
206
207 /**
208 * The message queue to this client
209 */
210 struct GNUNET_MQ_Handle *mq;
211};
212
213/**
214 * Our handle to the BLOCK library.
215 */
216struct GNUNET_BLOCK_Context *GDS_block_context;
217
218/**
219 * Handle for the statistics service.
220 */
221struct GNUNET_STATISTICS_Handle *GDS_stats;
222
223/**
224 * Handle for the service.
225 */
226struct GNUNET_SERVICE_Handle *GDS_service;
227
228/**
229 * The configuration the DHT service is running with
230 */
231const struct GNUNET_CONFIGURATION_Handle *GDS_cfg;
232
233/**
234 * List of active monitoring requests.
235 */
236static struct ClientMonitorRecord *monitor_head;
237
238/**
239 * List of active monitoring requests.
240 */
241static struct ClientMonitorRecord *monitor_tail;
242
243/**
244 * Hashmap for fast key based lookup, maps keys to `struct ClientQueryRecord` entries.
245 */
246static struct GNUNET_CONTAINER_MultiHashMap *forward_map;
247
248/**
249 * Heap with all of our client's request, sorted by retry time (earliest on top).
250 */
251static struct GNUNET_CONTAINER_Heap *retry_heap;
252
253/**
254 * Task that re-transmits requests (using retry_heap).
255 */
256static struct GNUNET_SCHEDULER_Task *retry_task;
257
258
259/**
260 * Free data structures associated with the given query.
261 *
262 * @param record record to remove
263 */
264static void
265remove_client_record (struct ClientQueryRecord *record)
266{
267 struct ClientHandle *ch = record->ch;
268
269 GNUNET_CONTAINER_DLL_remove (ch->cqr_head,
270 ch->cqr_tail,
271 record);
272 GNUNET_assert (GNUNET_YES ==
273 GNUNET_CONTAINER_multihashmap_remove (forward_map,
274 &record->key,
275 record));
276 if (NULL != record->hnode)
277 GNUNET_CONTAINER_heap_remove_node (record->hnode);
278 GNUNET_array_grow (record->seen_replies,
279 record->seen_replies_count,
280 0);
281 GNUNET_free (record);
282}
283
284
285/**
286 * Functions with this signature are called whenever a local client is
287 * connects to us.
288 *
289 * @param cls closure (NULL for dht)
290 * @param client identification of the client
291 * @param mq message queue for talking to @a client
292 * @return our `struct ClientHandle` for @a client
293 */
294static void *
295client_connect_cb (void *cls,
296 struct GNUNET_SERVICE_Client *client,
297 struct GNUNET_MQ_Handle *mq)
298{
299 struct ClientHandle *ch;
300
301 ch = GNUNET_new (struct ClientHandle);
302 ch->client = client;
303 ch->mq = mq;
304 return ch;
305}
306
307
308/**
309 * Functions with this signature are called whenever a client
310 * is disconnected on the network level.
311 *
312 * @param cls closure (NULL for dht)
313 * @param client identification of the client
314 * @param app_ctx our `struct ClientHandle` for @a client
315 */
316static void
317client_disconnect_cb (void *cls,
318 struct GNUNET_SERVICE_Client *client,
319 void *app_ctx)
320{
321 struct ClientHandle *ch = app_ctx;
322 struct ClientQueryRecord *cqr;
323 struct ClientMonitorRecord *monitor;
324
325 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
326 "Local client %p disconnects\n",
327 ch);
328 monitor = monitor_head;
329 while (NULL != monitor)
330 {
331 if (monitor->ch == ch)
332 {
333 struct ClientMonitorRecord *next;
334
335 next = monitor->next;
336 GNUNET_free (monitor->key);
337 GNUNET_CONTAINER_DLL_remove (monitor_head,
338 monitor_tail,
339 monitor);
340 GNUNET_free (monitor);
341 monitor = next;
342 }
343 else
344 {
345 monitor = monitor->next;
346 }
347 }
348 while (NULL != (cqr = ch->cqr_head))
349 remove_client_record (cqr);
350 GNUNET_free (ch);
351}
352
353
354/**
355 * Route the given request via the DHT. This includes updating
356 * the bloom filter and retransmission times, building the P2P
357 * message and initiating the routing operation.
358 */
359static void
360transmit_request (struct ClientQueryRecord *cqr)
361{
362 struct GNUNET_BLOCK_Group *bg;
363 struct GNUNET_CONTAINER_BloomFilter *peer_bf;
364
365 GNUNET_STATISTICS_update (GDS_stats,
366 gettext_noop (
367 "# GET requests from clients injected"),
368 1,
369 GNUNET_NO);
370 bg = GNUNET_BLOCK_group_create (GDS_block_context,
371 cqr->type,
372 GNUNET_CRYPTO_random_u32 (
373 GNUNET_CRYPTO_QUALITY_WEAK,
374 UINT32_MAX),
375 NULL,
376 0,
377 "seen-set-size",
378 cqr->seen_replies_count,
379 NULL);
380 GNUNET_BLOCK_group_set_seen (bg,
381 cqr->seen_replies,
382 cqr->seen_replies_count);
383 peer_bf
384 = GNUNET_CONTAINER_bloomfilter_init (NULL,
385 DHT_BLOOM_SIZE,
386 GNUNET_CONSTANTS_BLOOMFILTER_K);
387 LOG (GNUNET_ERROR_TYPE_DEBUG,
388 "Initiating GET for %s, replication %u, already have %u replies\n",
389 GNUNET_h2s (&cqr->key),
390 cqr->replication,
391 cqr->seen_replies_count);
392 GDS_NEIGHBOURS_handle_get (cqr->type,
393 cqr->msg_options,
394 cqr->replication,
395 0 /* hop count */,
396 &cqr->key,
397 cqr->xquery,
398 cqr->xquery_size,
399 bg,
400 peer_bf);
401 GNUNET_BLOCK_group_destroy (bg);
402 GNUNET_CONTAINER_bloomfilter_free (peer_bf);
403
404 /* exponential back-off for retries.
405 * max GNUNET_TIME_STD_EXPONENTIAL_BACKOFF_THRESHOLD (15 min) */
406 cqr->retry_frequency = GNUNET_TIME_STD_BACKOFF (cqr->retry_frequency);
407 cqr->retry_time = GNUNET_TIME_relative_to_absolute (cqr->retry_frequency);
408}
409
410
411/**
412 * Task that looks at the #retry_heap and transmits all of the requests
413 * on the heap that are ready for transmission. Then re-schedules
414 * itself (unless the heap is empty).
415 *
416 * @param cls unused
417 */
418static void
419transmit_next_request_task (void *cls)
420{
421 struct ClientQueryRecord *cqr;
422 struct GNUNET_TIME_Relative delay;
423
424 retry_task = NULL;
425 while (NULL != (cqr = GNUNET_CONTAINER_heap_remove_root (retry_heap)))
426 {
427 cqr->hnode = NULL;
428 delay = GNUNET_TIME_absolute_get_remaining (cqr->retry_time);
429 if (delay.rel_value_us > 0)
430 {
431 cqr->hnode
432 = GNUNET_CONTAINER_heap_insert (retry_heap,
433 cqr,
434 cqr->retry_time.abs_value_us);
435 retry_task
436 = GNUNET_SCHEDULER_add_at (cqr->retry_time,
437 &transmit_next_request_task,
438 NULL);
439 return;
440 }
441 transmit_request (cqr);
442 cqr->hnode
443 = GNUNET_CONTAINER_heap_insert (retry_heap,
444 cqr,
445 cqr->retry_time.abs_value_us);
446 }
447}
448
449
450/**
451 * Check DHT PUT messages from the client.
452 *
453 * @param cls the client we received this message from
454 * @param dht_msg the actual message received
455 * @return #GNUNET_OK (always)
456 */
457static int
458check_dht_local_put (void *cls,
459 const struct GNUNET_DHT_ClientPutMessage *dht_msg)
460{
461 /* always well-formed */
462 return GNUNET_OK;
463}
464
465
466/**
467 * Handler for PUT messages.
468 *
469 * @param cls the client we received this message from
470 * @param dht_msg the actual message received
471 */
472static void
473handle_dht_local_put (void *cls,
474 const struct GNUNET_DHT_ClientPutMessage *dht_msg)
475{
476 struct ClientHandle *ch = cls;
477 struct GNUNET_CONTAINER_BloomFilter *peer_bf;
478 uint16_t size;
479
480 size = ntohs (dht_msg->header.size);
481 GNUNET_STATISTICS_update (GDS_stats,
482 gettext_noop (
483 "# PUT requests received from clients"),
484 1,
485 GNUNET_NO);
486 LOG_TRAFFIC (GNUNET_ERROR_TYPE_DEBUG,
487 "CLIENT-PUT %s\n",
488 GNUNET_h2s_full (&dht_msg->key));
489 /* give to local clients */
490 LOG (GNUNET_ERROR_TYPE_DEBUG,
491 "Handling local PUT of %lu-bytes for query %s\n",
492 (unsigned long) (size - sizeof(struct GNUNET_DHT_ClientPutMessage)),
493 GNUNET_h2s (&dht_msg->key));
494 GDS_CLIENTS_handle_reply (GNUNET_TIME_absolute_ntoh (dht_msg->expiration),
495 &dht_msg->key,
496 0,
497 NULL,
498 0,
499 NULL,
500 ntohl (dht_msg->type),
501 size - sizeof(struct GNUNET_DHT_ClientPutMessage),
502 &dht_msg[1]);
503 /* store locally */
504 GDS_DATACACHE_handle_put (GNUNET_TIME_absolute_ntoh (dht_msg->expiration),
505 &dht_msg->key,
506 0,
507 NULL,
508 ntohl (dht_msg->type),
509 size - sizeof(struct GNUNET_DHT_ClientPutMessage),
510 &dht_msg[1]);
511 /* route to other peers */
512 peer_bf
513 = GNUNET_CONTAINER_bloomfilter_init (NULL,
514 DHT_BLOOM_SIZE,
515 GNUNET_CONSTANTS_BLOOMFILTER_K);
516 GDS_NEIGHBOURS_handle_put (ntohl (dht_msg->type),
517 ntohl (dht_msg->options),
518 ntohl (dht_msg->desired_replication_level),
519 GNUNET_TIME_absolute_ntoh (dht_msg->expiration),
520 0 /* hop count */,
521 peer_bf,
522 &dht_msg->key,
523 0,
524 NULL,
525 &dht_msg[1],
526 size - sizeof(struct GNUNET_DHT_ClientPutMessage));
527 GDS_CLIENTS_process_put (ntohl (dht_msg->options),
528 ntohl (dht_msg->type),
529 0,
530 ntohl (dht_msg->desired_replication_level),
531 1,
532 GDS_NEIGHBOURS_get_id (),
533 GNUNET_TIME_absolute_ntoh (dht_msg->expiration),
534 &dht_msg->key,
535 &dht_msg[1],
536 size - sizeof(struct GNUNET_DHT_ClientPutMessage));
537 GNUNET_CONTAINER_bloomfilter_free (peer_bf);
538 GNUNET_SERVICE_client_continue (ch->client);
539}
540
541
542/**
543 * Check DHT GET messages from the client.
544 *
545 * @param cls the client we received this message from
546 * @param message the actual message received
547 * @return #GNUNET_OK (always)
548 */
549static int
550check_dht_local_get (void *cls,
551 const struct GNUNET_DHT_ClientGetMessage *get)
552{
553 /* always well-formed */
554 return GNUNET_OK;
555}
556
557
558/**
559 * Handle a result from local datacache for a GET operation.
560 *
561 * @param cls the `struct ClientHandle` of the client doing the query
562 * @param type type of the block
563 * @param expiration_time when does the content expire
564 * @param key key for the content
565 * @param put_path_length number of entries in @a put_path
566 * @param put_path peers the original PUT traversed (if tracked)
567 * @param get_path_length number of entries in @a get_path
568 * @param get_path peers this reply has traversed so far (if tracked)
569 * @param data payload of the reply
570 * @param data_size number of bytes in @a data
571 */
572static void
573handle_local_result (void *cls,
574 enum GNUNET_BLOCK_Type type,
575 struct GNUNET_TIME_Absolute expiration_time,
576 const struct GNUNET_HashCode *key,
577 unsigned int put_path_length,
578 const struct GNUNET_PeerIdentity *put_path,
579 unsigned int get_path_length,
580 const struct GNUNET_PeerIdentity *get_path,
581 const void *data,
582 size_t data_size)
583{
584 // FIXME: this needs some clean up: inline the function,
585 // possibly avoid even looking up the client!
586 GDS_CLIENTS_handle_reply (expiration_time,
587 key,
588 0, NULL,
589 put_path_length, put_path,
590 type,
591 data_size, data);
592}
593
594
595/**
596 * Handler for DHT GET messages from the client.
597 *
598 * @param cls the client we received this message from
599 * @param message the actual message received
600 */
601static void
602handle_dht_local_get (void *cls,
603 const struct GNUNET_DHT_ClientGetMessage *get)
604{
605 struct ClientHandle *ch = cls;
606 struct ClientQueryRecord *cqr;
607 size_t xquery_size;
608 const char *xquery;
609 uint16_t size;
610
611 size = ntohs (get->header.size);
612 xquery_size = size - sizeof(struct GNUNET_DHT_ClientGetMessage);
613 xquery = (const char *) &get[1];
614 GNUNET_STATISTICS_update (GDS_stats,
615 gettext_noop
616 ("# GET requests received from clients"), 1,
617 GNUNET_NO);
618 LOG (GNUNET_ERROR_TYPE_DEBUG,
619 "Received GET request for %s from local client %p, xq: %.*s\n",
620 GNUNET_h2s (&get->key),
621 ch->client,
622 (int) xquery_size,
623 xquery);
624 LOG_TRAFFIC (GNUNET_ERROR_TYPE_DEBUG,
625 "CLIENT-GET %s\n",
626 GNUNET_h2s_full (&get->key));
627
628 cqr = GNUNET_malloc (sizeof(struct ClientQueryRecord) + xquery_size);
629 cqr->key = get->key;
630 cqr->ch = ch;
631 cqr->xquery = (void *) &cqr[1];
632 GNUNET_memcpy (&cqr[1], xquery, xquery_size);
633 cqr->hnode = GNUNET_CONTAINER_heap_insert (retry_heap, cqr, 0);
634 cqr->retry_frequency = GNUNET_TIME_UNIT_SECONDS;
635 cqr->retry_time = GNUNET_TIME_absolute_get ();
636 cqr->unique_id = get->unique_id;
637 cqr->xquery_size = xquery_size;
638 cqr->replication = ntohl (get->desired_replication_level);
639 cqr->msg_options = ntohl (get->options);
640 cqr->type = ntohl (get->type);
641 GNUNET_CONTAINER_DLL_insert (ch->cqr_head,
642 ch->cqr_tail,
643 cqr);
644 GNUNET_CONTAINER_multihashmap_put (forward_map,
645 &cqr->key,
646 cqr,
647 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
648 GDS_CLIENTS_process_get (ntohl (get->options),
649 ntohl (get->type),
650 0,
651 ntohl (get->desired_replication_level),
652 1,
653 GDS_NEIGHBOURS_get_id (),
654 &get->key);
655 /* start remote requests */
656 if (NULL != retry_task)
657 GNUNET_SCHEDULER_cancel (retry_task);
658 retry_task = GNUNET_SCHEDULER_add_now (&transmit_next_request_task,
659 NULL);
660 /* perform local lookup */
661 GDS_DATACACHE_handle_get (&get->key,
662 cqr->type,
663 cqr->xquery,
664 xquery_size,
665 NULL,
666 &handle_local_result,
667 ch);
668 GNUNET_SERVICE_client_continue (ch->client);
669}
670
671
672/**
673 * Closure for #find_by_unique_id().
674 */
675struct FindByUniqueIdContext
676{
677 /**
678 * Where to store the result, if found.
679 */
680 struct ClientQueryRecord *cqr;
681
682 uint64_t unique_id;
683};
684
685
686/**
687 * Function called for each existing DHT record for the given
688 * query. Checks if it matches the UID given in the closure
689 * and if so returns the entry as a result.
690 *
691 * @param cls the search context
692 * @param key query for the lookup (not used)
693 * @param value the `struct ClientQueryRecord`
694 * @return #GNUNET_YES to continue iteration (result not yet found)
695 */
696static int
697find_by_unique_id (void *cls,
698 const struct GNUNET_HashCode *key,
699 void *value)
700{
701 struct FindByUniqueIdContext *fui_ctx = cls;
702 struct ClientQueryRecord *cqr = value;
703
704 if (cqr->unique_id != fui_ctx->unique_id)
705 return GNUNET_YES;
706 fui_ctx->cqr = cqr;
707 return GNUNET_NO;
708}
709
710
711/**
712 * Check "GET result seen" messages from the client.
713 *
714 * @param cls the client we received this message from
715 * @param message the actual message received
716 * @return #GNUNET_OK if @a seen is well-formed
717 */
718static int
719check_dht_local_get_result_seen (void *cls,
720 const struct
721 GNUNET_DHT_ClientGetResultSeenMessage *seen)
722{
723 uint16_t size;
724 unsigned int hash_count;
725
726 size = ntohs (seen->header.size);
727 hash_count = (size - sizeof(struct GNUNET_DHT_ClientGetResultSeenMessage))
728 / sizeof(struct GNUNET_HashCode);
729 if (size != sizeof(struct GNUNET_DHT_ClientGetResultSeenMessage)
730 + hash_count * sizeof(struct GNUNET_HashCode))
731 {
732 GNUNET_break (0);
733 return GNUNET_SYSERR;
734 }
735 return GNUNET_OK;
736}
737
738
739/**
740 * Handler for "GET result seen" messages from the client.
741 *
742 * @param cls the client we received this message from
743 * @param message the actual message received
744 */
745static void
746handle_dht_local_get_result_seen (void *cls,
747 const struct
748 GNUNET_DHT_ClientGetResultSeenMessage *seen)
749{
750 struct ClientHandle *ch = cls;
751 uint16_t size;
752 unsigned int hash_count;
753 unsigned int old_count;
754 const struct GNUNET_HashCode *hc;
755 struct FindByUniqueIdContext fui_ctx;
756 struct ClientQueryRecord *cqr;
757
758 size = ntohs (seen->header.size);
759 hash_count = (size - sizeof(struct GNUNET_DHT_ClientGetResultSeenMessage))
760 / sizeof(struct GNUNET_HashCode);
761 hc = (const struct GNUNET_HashCode*) &seen[1];
762 fui_ctx.unique_id = seen->unique_id;
763 fui_ctx.cqr = NULL;
764 GNUNET_CONTAINER_multihashmap_get_multiple (forward_map,
765 &seen->key,
766 &find_by_unique_id,
767 &fui_ctx);
768 if (NULL == (cqr = fui_ctx.cqr))
769 {
770 GNUNET_break (0);
771 GNUNET_SERVICE_client_drop (ch->client);
772 return;
773 }
774 /* finally, update 'seen' list */
775 old_count = cqr->seen_replies_count;
776 GNUNET_array_grow (cqr->seen_replies,
777 cqr->seen_replies_count,
778 cqr->seen_replies_count + hash_count);
779 GNUNET_memcpy (&cqr->seen_replies[old_count],
780 hc,
781 sizeof(struct GNUNET_HashCode) * hash_count);
782}
783
784
785/**
786 * Closure for #remove_by_unique_id().
787 */
788struct RemoveByUniqueIdContext
789{
790 /**
791 * Client that issued the removal request.
792 */
793 struct ClientHandle *ch;
794
795 /**
796 * Unique ID of the request.
797 */
798 uint64_t unique_id;
799};
800
801
802/**
803 * Iterator over hash map entries that frees all entries
804 * that match the given client and unique ID.
805 *
806 * @param cls unique ID and client to search for in source routes
807 * @param key current key code
808 * @param value value in the hash map, a ClientQueryRecord
809 * @return #GNUNET_YES (we should continue to iterate)
810 */
811static int
812remove_by_unique_id (void *cls,
813 const struct GNUNET_HashCode *key,
814 void *value)
815{
816 const struct RemoveByUniqueIdContext *ctx = cls;
817 struct ClientQueryRecord *cqr = value;
818
819 if (cqr->unique_id != ctx->unique_id)
820 return GNUNET_YES;
821 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
822 "Removing client %p's record for key %s (by unique id)\n",
823 ctx->ch->client,
824 GNUNET_h2s (key));
825 remove_client_record (cqr);
826 return GNUNET_YES;
827}
828
829
830/**
831 * Handler for any generic DHT stop messages, calls the appropriate handler
832 * depending on message type (if processed locally)
833 *
834 * @param cls client we received this message from
835 * @param message the actual message received
836 *
837 */
838static void
839handle_dht_local_get_stop (void *cls,
840 const struct
841 GNUNET_DHT_ClientGetStopMessage *dht_stop_msg)
842{
843 struct ClientHandle *ch = cls;
844 struct RemoveByUniqueIdContext ctx;
845
846 GNUNET_STATISTICS_update (GDS_stats,
847 gettext_noop
848 ("# GET STOP requests received from clients"), 1,
849 GNUNET_NO);
850 LOG (GNUNET_ERROR_TYPE_DEBUG,
851 "Received GET STOP request for %s from local client %p\n",
852 GNUNET_h2s (&dht_stop_msg->key),
853 ch->client);
854 ctx.ch = ch;
855 ctx.unique_id = dht_stop_msg->unique_id;
856 GNUNET_CONTAINER_multihashmap_get_multiple (forward_map,
857 &dht_stop_msg->key,
858 &remove_by_unique_id,
859 &ctx);
860 GNUNET_SERVICE_client_continue (ch->client);
861}
862
863
864/**
865 * Handler for monitor start messages
866 *
867 * @param cls the client we received this message from
868 * @param msg the actual message received
869 *
870 */
871static void
872handle_dht_local_monitor (void *cls,
873 const struct GNUNET_DHT_MonitorStartStopMessage *msg)
874{
875 struct ClientHandle *ch = cls;
876 struct ClientMonitorRecord *r;
877
878 r = GNUNET_new (struct ClientMonitorRecord);
879 r->ch = ch;
880 r->type = ntohl (msg->type);
881 r->get = ntohs (msg->get);
882 r->get_resp = ntohs (msg->get_resp);
883 r->put = ntohs (msg->put);
884 if (0 == ntohs (msg->filter_key))
885 {
886 r->key = NULL;
887 }
888 else
889 {
890 r->key = GNUNET_new (struct GNUNET_HashCode);
891 GNUNET_memcpy (r->key,
892 &msg->key,
893 sizeof(struct GNUNET_HashCode));
894 }
895 GNUNET_CONTAINER_DLL_insert (monitor_head,
896 monitor_tail,
897 r);
898 GNUNET_SERVICE_client_continue (ch->client);
899}
900
901
902/**
903 * Handler for monitor stop messages
904 *
905 * @param cls the client we received this message from
906 * @param msg the actual message received
907 */
908static void
909handle_dht_local_monitor_stop (void *cls,
910 const struct
911 GNUNET_DHT_MonitorStartStopMessage *msg)
912{
913 struct ClientHandle *ch = cls;
914 struct ClientMonitorRecord *r;
915 int keys_match;
916
917 GNUNET_SERVICE_client_continue (ch->client);
918 for (r = monitor_head; NULL != r; r = r->next)
919 {
920 if (NULL == r->key)
921 {
922 keys_match = (0 == ntohs (msg->filter_key));
923 }
924 else
925 {
926 keys_match = ((0 != ntohs (msg->filter_key)) &&
927 (! memcmp (r->key,
928 &msg->key,
929 sizeof(struct GNUNET_HashCode))));
930 }
931 if ((ch == r->ch) &&
932 (ntohl (msg->type) == r->type) &&
933 (r->get == msg->get) &&
934 (r->get_resp == msg->get_resp) &&
935 (r->put == msg->put) &&
936 keys_match)
937 {
938 GNUNET_CONTAINER_DLL_remove (monitor_head,
939 monitor_tail,
940 r);
941 GNUNET_free (r->key);
942 GNUNET_free (r);
943 return; /* Delete only ONE entry */
944 }
945 }
946}
947
948
949/**
950 * Closure for #forward_reply()
951 */
952struct ForwardReplyContext
953{
954 /**
955 * Expiration time of the reply.
956 */
957 struct GNUNET_TIME_Absolute expiration;
958
959 /**
960 * GET path taken.
961 */
962 const struct GNUNET_PeerIdentity *get_path;
963
964 /**
965 * PUT path taken.
966 */
967 const struct GNUNET_PeerIdentity *put_path;
968
969 /**
970 * Embedded payload.
971 */
972 const void *data;
973
974 /**
975 * Number of bytes in data.
976 */
977 size_t data_size;
978
979 /**
980 * Number of entries in @e get_path.
981 */
982 unsigned int get_path_length;
983
984 /**
985 * Number of entries in @e put_path.
986 */
987 unsigned int put_path_length;
988
989 /**
990 * Type of the data.
991 */
992 enum GNUNET_BLOCK_Type type;
993};
994
995
996/**
997 * Iterator over hash map entries that send a given reply to
998 * each of the matching clients. With some tricky recycling
999 * of the buffer.
1000 *
1001 * @param cls the 'struct ForwardReplyContext'
1002 * @param key current key
1003 * @param value value in the hash map, a ClientQueryRecord
1004 * @return #GNUNET_YES (we should continue to iterate),
1005 * if the result is mal-formed, #GNUNET_NO
1006 */
1007static int
1008forward_reply (void *cls,
1009 const struct GNUNET_HashCode *key,
1010 void *value)
1011{
1012 struct ForwardReplyContext *frc = cls;
1013 struct ClientQueryRecord *record = value;
1014 struct GNUNET_MQ_Envelope *env;
1015 struct GNUNET_DHT_ClientResultMessage *reply;
1016 enum GNUNET_BLOCK_EvaluationResult eval;
1017 int do_free;
1018 struct GNUNET_HashCode ch;
1019 struct GNUNET_PeerIdentity *paths;
1020
1021 LOG_TRAFFIC (GNUNET_ERROR_TYPE_DEBUG,
1022 "CLIENT-RESULT %s\n",
1023 GNUNET_h2s_full (key));
1024 if ((record->type != GNUNET_BLOCK_TYPE_ANY) &&
1025 (record->type != frc->type))
1026 {
1027 LOG (GNUNET_ERROR_TYPE_DEBUG,
1028 "Record type mismatch, not passing request for key %s to local client\n",
1029 GNUNET_h2s (key));
1030 GNUNET_STATISTICS_update (GDS_stats,
1031 gettext_noop
1032 (
1033 "# Key match, type mismatches in REPLY to CLIENT"),
1034 1, GNUNET_NO);
1035 return GNUNET_YES; /* type mismatch */
1036 }
1037 GNUNET_CRYPTO_hash (frc->data, frc->data_size, &ch);
1038 for (unsigned int i = 0; i < record->seen_replies_count; i++)
1039 if (0 == memcmp (&record->seen_replies[i],
1040 &ch,
1041 sizeof(struct GNUNET_HashCode)))
1042 {
1043 LOG (GNUNET_ERROR_TYPE_DEBUG,
1044 "Duplicate reply, not passing request for key %s to local client\n",
1045 GNUNET_h2s (key));
1046 GNUNET_STATISTICS_update (GDS_stats,
1047 gettext_noop
1048 (
1049 "# Duplicate REPLIES to CLIENT request dropped"),
1050 1, GNUNET_NO);
1051 return GNUNET_YES; /* duplicate */
1052 }
1053 eval
1054 = GNUNET_BLOCK_evaluate (GDS_block_context,
1055 record->type,
1056 NULL,
1057 GNUNET_BLOCK_EO_NONE,
1058 key,
1059 record->xquery,
1060 record->xquery_size,
1061 frc->data,
1062 frc->data_size);
1063 LOG (GNUNET_ERROR_TYPE_DEBUG,
1064 "Evaluation result is %d for key %s for local client's query\n",
1065 (int) eval,
1066 GNUNET_h2s (key));
1067 switch (eval)
1068 {
1069 case GNUNET_BLOCK_EVALUATION_OK_LAST:
1070 do_free = GNUNET_YES;
1071 break;
1072
1073 case GNUNET_BLOCK_EVALUATION_OK_MORE:
1074 GNUNET_array_append (record->seen_replies,
1075 record->seen_replies_count,
1076 ch);
1077 do_free = GNUNET_NO;
1078 break;
1079
1080 case GNUNET_BLOCK_EVALUATION_OK_DUPLICATE:
1081 /* should be impossible to encounter here */
1082 GNUNET_break (0);
1083 return GNUNET_YES;
1084
1085 case GNUNET_BLOCK_EVALUATION_RESULT_INVALID:
1086 GNUNET_break_op (0);
1087 return GNUNET_NO;
1088
1089 case GNUNET_BLOCK_EVALUATION_REQUEST_VALID:
1090 GNUNET_break (0);
1091 return GNUNET_NO;
1092
1093 case GNUNET_BLOCK_EVALUATION_REQUEST_INVALID:
1094 GNUNET_break (0);
1095 return GNUNET_NO;
1096
1097 case GNUNET_BLOCK_EVALUATION_RESULT_IRRELEVANT:
1098 return GNUNET_YES;
1099
1100 case GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED:
1101 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1102 _ ("Unsupported block type (%u) in request!\n"), record->type);
1103 return GNUNET_NO;
1104
1105 default:
1106 GNUNET_break (0);
1107 return GNUNET_NO;
1108 }
1109 GNUNET_STATISTICS_update (GDS_stats,
1110 gettext_noop ("# RESULTS queued for clients"),
1111 1,
1112 GNUNET_NO);
1113 env = GNUNET_MQ_msg_extra (reply,
1114 frc->data_size
1115 + (frc->get_path_length + frc->put_path_length)
1116 * sizeof(struct GNUNET_PeerIdentity),
1117 GNUNET_MESSAGE_TYPE_DHT_CLIENT_RESULT);
1118 reply->type = htonl (frc->type);
1119 reply->get_path_length = htonl (frc->get_path_length);
1120 reply->put_path_length = htonl (frc->put_path_length);
1121 reply->unique_id = record->unique_id;
1122 reply->expiration = GNUNET_TIME_absolute_hton (frc->expiration);
1123 reply->key = *key;
1124 paths = (struct GNUNET_PeerIdentity *) &reply[1];
1125 GNUNET_memcpy (paths,
1126 frc->put_path,
1127 sizeof(struct GNUNET_PeerIdentity) * frc->put_path_length);
1128 GNUNET_memcpy (&paths[frc->put_path_length],
1129 frc->get_path,
1130 sizeof(struct GNUNET_PeerIdentity) * frc->get_path_length);
1131 GNUNET_memcpy (&paths[frc->get_path_length + frc->put_path_length],
1132 frc->data,
1133 frc->data_size);
1134 LOG (GNUNET_ERROR_TYPE_DEBUG,
1135 "Sending reply to query %s for client %p\n",
1136 GNUNET_h2s (key),
1137 record->ch->client);
1138 GNUNET_MQ_send (record->ch->mq,
1139 env);
1140 if (GNUNET_YES == do_free)
1141 remove_client_record (record);
1142 return GNUNET_YES;
1143}
1144
1145
1146/**
1147 * Handle a reply we've received from another peer. If the reply
1148 * matches any of our pending queries, forward it to the respective
1149 * client(s).
1150 *
1151 * @param expiration when will the reply expire
1152 * @param key the query this reply is for
1153 * @param get_path_length number of peers in @a get_path
1154 * @param get_path path the reply took on get
1155 * @param put_path_length number of peers in @a put_path
1156 * @param put_path path the reply took on put
1157 * @param type type of the reply
1158 * @param data_size number of bytes in @a data
1159 * @param data application payload data
1160 */
1161void
1162GDS_CLIENTS_handle_reply (struct GNUNET_TIME_Absolute expiration,
1163 const struct GNUNET_HashCode *key,
1164 unsigned int get_path_length,
1165 const struct GNUNET_PeerIdentity *get_path,
1166 unsigned int put_path_length,
1167 const struct GNUNET_PeerIdentity *put_path,
1168 enum GNUNET_BLOCK_Type type,
1169 size_t data_size,
1170 const void *data)
1171{
1172 struct ForwardReplyContext frc;
1173 size_t msize;
1174
1175 msize = sizeof(struct GNUNET_DHT_ClientResultMessage) + data_size
1176 + (get_path_length + put_path_length) * sizeof(struct
1177 GNUNET_PeerIdentity);
1178 if (msize >= GNUNET_MAX_MESSAGE_SIZE)
1179 {
1180 GNUNET_break (0);
1181 return;
1182 }
1183 if (NULL == GNUNET_CONTAINER_multihashmap_get (forward_map,
1184 key))
1185 {
1186 LOG (GNUNET_ERROR_TYPE_DEBUG,
1187 "No matching client for reply for key %s\n",
1188 GNUNET_h2s (key));
1189 GNUNET_STATISTICS_update (GDS_stats,
1190 gettext_noop (
1191 "# REPLIES ignored for CLIENTS (no match)"),
1192 1,
1193 GNUNET_NO);
1194 return; /* no matching request, fast exit! */
1195 }
1196 frc.expiration = expiration;
1197 frc.get_path = get_path;
1198 frc.put_path = put_path;
1199 frc.data = data;
1200 frc.data_size = data_size;
1201 frc.get_path_length = get_path_length;
1202 frc.put_path_length = put_path_length;
1203 frc.type = type;
1204 LOG (GNUNET_ERROR_TYPE_DEBUG,
1205 "Forwarding reply for key %s to client\n",
1206 GNUNET_h2s (key));
1207 GNUNET_CONTAINER_multihashmap_get_multiple (forward_map,
1208 key,
1209 &forward_reply,
1210 &frc);
1211}
1212
1213
1214/**
1215 * Check if some client is monitoring GET messages and notify
1216 * them in that case.
1217 *
1218 * @param options Options, for instance RecordRoute, DemultiplexEverywhere.
1219 * @param type The type of data in the request.
1220 * @param hop_count Hop count so far.
1221 * @param path_length number of entries in path (or 0 if not recorded).
1222 * @param path peers on the GET path (or NULL if not recorded).
1223 * @param desired_replication_level Desired replication level.
1224 * @param key Key of the requested data.
1225 */
1226void
1227GDS_CLIENTS_process_get (uint32_t options,
1228 enum GNUNET_BLOCK_Type type,
1229 uint32_t hop_count,
1230 uint32_t desired_replication_level,
1231 unsigned int path_length,
1232 const struct GNUNET_PeerIdentity *path,
1233 const struct GNUNET_HashCode *key)
1234{
1235 struct ClientMonitorRecord *m;
1236 struct ClientHandle **cl;
1237 unsigned int cl_size;
1238
1239 cl = NULL;
1240 cl_size = 0;
1241 for (m = monitor_head; NULL != m; m = m->next)
1242 {
1243 if (((GNUNET_BLOCK_TYPE_ANY == m->type) ||
1244 (m->type == type)) &&
1245 ((NULL == m->key) ||
1246 (0 == memcmp (key,
1247 m->key,
1248 sizeof(struct GNUNET_HashCode)))))
1249 {
1250 struct GNUNET_MQ_Envelope *env;
1251 struct GNUNET_DHT_MonitorGetMessage *mmsg;
1252 struct GNUNET_PeerIdentity *msg_path;
1253 size_t msize;
1254 unsigned int i;
1255
1256 /* Don't send duplicates */
1257 for (i = 0; i < cl_size; i++)
1258 if (cl[i] == m->ch)
1259 break;
1260 if (i < cl_size)
1261 continue;
1262 GNUNET_array_append (cl,
1263 cl_size,
1264 m->ch);
1265
1266 msize = path_length * sizeof(struct GNUNET_PeerIdentity);
1267 env = GNUNET_MQ_msg_extra (mmsg,
1268 msize,
1269 GNUNET_MESSAGE_TYPE_DHT_MONITOR_GET);
1270 mmsg->options = htonl (options);
1271 mmsg->type = htonl (type);
1272 mmsg->hop_count = htonl (hop_count);
1273 mmsg->desired_replication_level = htonl (desired_replication_level);
1274 mmsg->get_path_length = htonl (path_length);
1275 mmsg->key = *key;
1276 msg_path = (struct GNUNET_PeerIdentity *) &mmsg[1];
1277 GNUNET_memcpy (msg_path,
1278 path,
1279 path_length * sizeof(struct GNUNET_PeerIdentity));
1280 GNUNET_MQ_send (m->ch->mq,
1281 env);
1282 }
1283 }
1284 GNUNET_free (cl);
1285}
1286
1287
1288/**
1289 * Check if some client is monitoring GET RESP messages and notify
1290 * them in that case.
1291 *
1292 * @param type The type of data in the result.
1293 * @param get_path Peers on GET path (or NULL if not recorded).
1294 * @param get_path_length number of entries in get_path.
1295 * @param put_path peers on the PUT path (or NULL if not recorded).
1296 * @param put_path_length number of entries in get_path.
1297 * @param exp Expiration time of the data.
1298 * @param key Key of the data.
1299 * @param data Pointer to the result data.
1300 * @param size Number of bytes in @a data.
1301 */
1302void
1303GDS_CLIENTS_process_get_resp (enum GNUNET_BLOCK_Type type,
1304 const struct GNUNET_PeerIdentity *get_path,
1305 unsigned int get_path_length,
1306 const struct GNUNET_PeerIdentity *put_path,
1307 unsigned int put_path_length,
1308 struct GNUNET_TIME_Absolute exp,
1309 const struct GNUNET_HashCode *key,
1310 const void *data,
1311 size_t size)
1312{
1313 struct ClientMonitorRecord *m;
1314 struct ClientHandle **cl;
1315 unsigned int cl_size;
1316
1317 cl = NULL;
1318 cl_size = 0;
1319 for (m = monitor_head; NULL != m; m = m->next)
1320 {
1321 if (((GNUNET_BLOCK_TYPE_ANY == m->type) || (m->type == type) ) &&
1322 ((NULL == m->key) ||
1323 (memcmp (key, m->key, sizeof(struct GNUNET_HashCode)) == 0) ))
1324 {
1325 struct GNUNET_MQ_Envelope *env;
1326 struct GNUNET_DHT_MonitorGetRespMessage *mmsg;
1327 struct GNUNET_PeerIdentity *path;
1328 size_t msize;
1329 unsigned int i;
1330
1331 /* Don't send duplicates */
1332 for (i = 0; i < cl_size; i++)
1333 if (cl[i] == m->ch)
1334 break;
1335 if (i < cl_size)
1336 continue;
1337 GNUNET_array_append (cl,
1338 cl_size,
1339 m->ch);
1340
1341 msize = size;
1342 msize += (get_path_length + put_path_length)
1343 * sizeof(struct GNUNET_PeerIdentity);
1344 env = GNUNET_MQ_msg_extra (mmsg,
1345 msize,
1346 GNUNET_MESSAGE_TYPE_DHT_MONITOR_GET_RESP);
1347 mmsg->type = htonl (type);
1348 mmsg->put_path_length = htonl (put_path_length);
1349 mmsg->get_path_length = htonl (get_path_length);
1350 mmsg->expiration_time = GNUNET_TIME_absolute_hton (exp);
1351 mmsg->key = *key;
1352 path = (struct GNUNET_PeerIdentity *) &mmsg[1];
1353 GNUNET_memcpy (path,
1354 put_path,
1355 put_path_length * sizeof(struct GNUNET_PeerIdentity));
1356 GNUNET_memcpy (path,
1357 get_path,
1358 get_path_length * sizeof(struct GNUNET_PeerIdentity));
1359 GNUNET_memcpy (&path[get_path_length],
1360 data,
1361 size);
1362 GNUNET_MQ_send (m->ch->mq,
1363 env);
1364 }
1365 }
1366 GNUNET_free (cl);
1367}
1368
1369
1370/**
1371 * Check if some client is monitoring PUT messages and notify
1372 * them in that case.
1373 *
1374 * @param options Options, for instance RecordRoute, DemultiplexEverywhere.
1375 * @param type The type of data in the request.
1376 * @param hop_count Hop count so far.
1377 * @param path_length number of entries in path (or 0 if not recorded).
1378 * @param path peers on the PUT path (or NULL if not recorded).
1379 * @param desired_replication_level Desired replication level.
1380 * @param exp Expiration time of the data.
1381 * @param key Key under which data is to be stored.
1382 * @param data Pointer to the data carried.
1383 * @param size Number of bytes in data.
1384 */
1385void
1386GDS_CLIENTS_process_put (uint32_t options,
1387 enum GNUNET_BLOCK_Type type,
1388 uint32_t hop_count,
1389 uint32_t desired_replication_level,
1390 unsigned int path_length,
1391 const struct GNUNET_PeerIdentity *path,
1392 struct GNUNET_TIME_Absolute exp,
1393 const struct GNUNET_HashCode *key,
1394 const void *data,
1395 size_t size)
1396{
1397 struct ClientMonitorRecord *m;
1398 struct ClientHandle **cl;
1399 unsigned int cl_size;
1400
1401 cl = NULL;
1402 cl_size = 0;
1403 for (m = monitor_head; NULL != m; m = m->next)
1404 {
1405 if (((GNUNET_BLOCK_TYPE_ANY == m->type) || (m->type == type) ) &&
1406 ((NULL == m->key) ||
1407 (memcmp (key, m->key, sizeof(struct GNUNET_HashCode)) == 0) ))
1408 {
1409 struct GNUNET_MQ_Envelope *env;
1410 struct GNUNET_DHT_MonitorPutMessage *mmsg;
1411 struct GNUNET_PeerIdentity *msg_path;
1412 size_t msize;
1413 unsigned int i;
1414
1415 /* Don't send duplicates */
1416 for (i = 0; i < cl_size; i++)
1417 if (cl[i] == m->ch)
1418 break;
1419 if (i < cl_size)
1420 continue;
1421 GNUNET_array_append (cl,
1422 cl_size,
1423 m->ch);
1424
1425 msize = size;
1426 msize += path_length * sizeof(struct GNUNET_PeerIdentity);
1427 env = GNUNET_MQ_msg_extra (mmsg,
1428 msize,
1429 GNUNET_MESSAGE_TYPE_DHT_MONITOR_PUT);
1430 mmsg->options = htonl (options);
1431 mmsg->type = htonl (type);
1432 mmsg->hop_count = htonl (hop_count);
1433 mmsg->desired_replication_level = htonl (desired_replication_level);
1434 mmsg->put_path_length = htonl (path_length);
1435 mmsg->key = *key;
1436 mmsg->expiration_time = GNUNET_TIME_absolute_hton (exp);
1437 msg_path = (struct GNUNET_PeerIdentity *) &mmsg[1];
1438 GNUNET_memcpy (msg_path,
1439 path,
1440 path_length * sizeof(struct GNUNET_PeerIdentity));
1441 GNUNET_memcpy (&msg_path[path_length],
1442 data,
1443 size);
1444 GNUNET_MQ_send (m->ch->mq,
1445 env);
1446 }
1447 }
1448 GNUNET_free (cl);
1449}
1450
1451
1452/**
1453 * Initialize client subsystem.
1454 *
1455 * @param server the initialized server
1456 */
1457static void
1458GDS_CLIENTS_init ()
1459{
1460 forward_map
1461 = GNUNET_CONTAINER_multihashmap_create (1024,
1462 GNUNET_YES);
1463 retry_heap
1464 = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1465}
1466
1467
1468/**
1469 * Shutdown client subsystem.
1470 */
1471static void
1472GDS_CLIENTS_stop ()
1473{
1474 if (NULL != retry_task)
1475 {
1476 GNUNET_SCHEDULER_cancel (retry_task);
1477 retry_task = NULL;
1478 }
1479}
1480
1481
1482/**
1483 * Define "main" method using service macro.
1484 *
1485 * @param name name of the service, like "dht" or "xdht"
1486 * @param run name of the initializaton method for the service
1487 */
1488#define GDS_DHT_SERVICE_INIT(name, run) \
1489 GNUNET_SERVICE_MAIN \
1490 (name, \
1491 GNUNET_SERVICE_OPTION_NONE, \
1492 run, \
1493 &client_connect_cb, \
1494 &client_disconnect_cb, \
1495 NULL, \
1496 GNUNET_MQ_hd_var_size (dht_local_put, \
1497 GNUNET_MESSAGE_TYPE_DHT_CLIENT_PUT, \
1498 struct GNUNET_DHT_ClientPutMessage, \
1499 NULL), \
1500 GNUNET_MQ_hd_var_size (dht_local_get, \
1501 GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET, \
1502 struct GNUNET_DHT_ClientGetMessage, \
1503 NULL), \
1504 GNUNET_MQ_hd_fixed_size (dht_local_get_stop, \
1505 GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET_STOP, \
1506 struct GNUNET_DHT_ClientGetStopMessage, \
1507 NULL), \
1508 GNUNET_MQ_hd_fixed_size (dht_local_monitor, \
1509 GNUNET_MESSAGE_TYPE_DHT_MONITOR_START, \
1510 struct GNUNET_DHT_MonitorStartStopMessage, \
1511 NULL), \
1512 GNUNET_MQ_hd_fixed_size (dht_local_monitor_stop, \
1513 GNUNET_MESSAGE_TYPE_DHT_MONITOR_STOP, \
1514 struct GNUNET_DHT_MonitorStartStopMessage, \
1515 NULL), \
1516 GNUNET_MQ_hd_var_size (dht_local_get_result_seen, \
1517 GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET_RESULTS_KNOWN, \
1518 struct GNUNET_DHT_ClientGetResultSeenMessage, \
1519 NULL), \
1520 GNUNET_MQ_handler_end ())
1521
1522
1523/**
1524 * MINIMIZE heap size (way below 128k) since this process doesn't need much.
1525 */
1526void __attribute__ ((destructor))
1527GDS_CLIENTS_done ()
1528{
1529 if (NULL != retry_heap)
1530 {
1531 GNUNET_assert (0 == GNUNET_CONTAINER_heap_get_size (retry_heap));
1532 GNUNET_CONTAINER_heap_destroy (retry_heap);
1533 retry_heap = NULL;
1534 }
1535 if (NULL != forward_map)
1536 {
1537 GNUNET_assert (0 == GNUNET_CONTAINER_multihashmap_size (forward_map));
1538 GNUNET_CONTAINER_multihashmap_destroy (forward_map);
1539 forward_map = NULL;
1540 }
1541}
1542
1543
1544/* end of gnunet-service-dht_clients.c */
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-25 15:00:43 +0000