2 This file is part of GNUnet.
3 (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
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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
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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.
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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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
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_clients.h"
34 #include "gnunet-service-dht_datacache.h"
35 #include "gnunet-service-dht_neighbours.h"
40 * Linked list of messages to send to clients.
45 * Pointer to next item in the list
47 struct PendingMessage *next;
50 * Pointer to previous item in the list
52 struct PendingMessage *prev;
55 * Actual message to be sent, allocated at the end of the struct:
56 * // msg = (cast) &pm[1];
57 * // memcpy (&pm[1], data, len);
59 const struct GNUNET_MessageHeader *msg;
65 * Struct containing information about a client,
66 * handle to connect to it, and any pending messages
67 * that need to be sent to it.
72 * Linked list of active clients
74 struct ClientList *next;
77 * Linked list of active clients
79 struct ClientList *prev;
82 * The handle to this client
84 struct GNUNET_SERVER_Client *client_handle;
87 * Handle to the current transmission request, NULL
90 struct GNUNET_CONNECTION_TransmitHandle *transmit_handle;
93 * Linked list of pending messages for this client
95 struct PendingMessage *pending_head;
98 * Tail of linked list of pending messages for this client
100 struct PendingMessage *pending_tail;
106 * Entry in the DHT routing table for a client's GET request.
108 struct ClientQueryRecord
112 * The key this request was about
117 * Client responsible for the request.
119 struct ClientList *client;
122 * Extended query (see gnunet_block_lib.h), allocated at the end of this struct.
127 * Replies we have already seen for this request.
129 GNUNET_HashCode *seen_replies;
132 * Pointer to this nodes heap location in the retry-heap (for fast removal)
134 struct GNUNET_CONTAINER_HeapNode *hnode;
137 * What's the delay between re-try operations that we currently use for this
140 struct GNUNET_TIME_Relative retry_frequency;
143 * What's the next time we should re-try this request?
145 struct GNUNET_TIME_Absolute retry_time;
148 * The unique identifier of this request
153 * Number of bytes in xquery.
158 * Number of entries in 'seen_replies'.
160 unsigned int seen_replies_count;
163 * Desired replication level
165 uint32_t replication;
168 * Any message options for this request
170 uint32_t msg_options;
173 * The type for the data for the GET request.
175 enum GNUNET_BLOCK_Type type;
181 * List of active clients.
183 static struct ClientList *client_head;
186 * List of active clients.
188 static struct ClientList *client_tail;
191 * Hashmap for fast key based lookup, maps keys to 'struct ClientQueryRecord' entries.
193 static struct GNUNET_CONTAINER_MultiHashMap *forward_map;
196 * Heap with all of our client's request, sorted by retry time (earliest on top).
198 static struct GNUNET_CONTAINER_Heap *retry_heap;
201 * Task that re-transmits requests (using retry_heap).
203 static GNUNET_SCHEDULER_TaskIdentifier retry_task;
207 * Find a client if it exists, add it otherwise.
209 * @param client the server handle to the client
211 * @return the client if found, a new client otherwise
213 static struct ClientList *
214 find_active_client (struct GNUNET_SERVER_Client *client)
216 struct ClientList *pos = client_head;
217 struct ClientList *ret;
221 if (pos->client_handle == client)
225 ret = GNUNET_malloc (sizeof (struct ClientList));
226 ret->client_handle = client;
227 GNUNET_CONTAINER_DLL_insert (client_head,
235 * Iterator over hash map entries that frees all entries
236 * associated with the given client.
238 * @param cls client to search for in source routes
239 * @param key current key code (ignored)
240 * @param value value in the hash map, a ClientQueryRecord
241 * @return GNUNET_YES (we should continue to iterate)
244 remove_client_records (void *cls, const GNUNET_HashCode * key, void *value)
246 struct ClientList *client = cls;
247 struct ClientQueryRecord *record = value;
249 if (record->client != client)
251 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
252 "Removing client %p's record for key %s\n",
255 GNUNET_assert (GNUNET_YES ==
256 GNUNET_CONTAINER_multihashmap_remove (forward_map,
258 if (NULL != record->hnode)
259 GNUNET_CONTAINER_heap_remove_node (record->hnode);
260 GNUNET_array_grow (record->seen_replies,
261 record->seen_replies_count,
263 GNUNET_free (record);
269 * Functions with this signature are called whenever a client
270 * is disconnected on the network level.
272 * @param cls closure (NULL for dht)
273 * @param client identification of the client; NULL
274 * for the last call when the server is destroyed
277 handle_client_disconnect (void *cls,
278 struct GNUNET_SERVER_Client *client)
280 struct ClientList *pos;
281 struct PendingMessage *reply;
283 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
284 "Local client %p disconnects\n",
286 pos = find_active_client (client);
287 GNUNET_CONTAINER_DLL_remove (client_head,
290 if (pos->transmit_handle != NULL)
291 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->transmit_handle);
292 while (NULL != (reply = pos->pending_head))
294 GNUNET_CONTAINER_DLL_remove (pos->pending_head, pos->pending_tail,
298 GNUNET_CONTAINER_multihashmap_iterate (forward_map,
299 &remove_client_records, pos);
305 * Route the given request via the DHT. This includes updating
306 * the bloom filter and retransmission times, building the P2P
307 * message and initiating the routing operation.
310 transmit_request (struct ClientQueryRecord *cqr)
312 int32_t reply_bf_mutator;
313 struct GNUNET_CONTAINER_BloomFilter *reply_bf;
314 struct GNUNET_CONTAINER_BloomFilter *peer_bf;
316 GNUNET_STATISTICS_update (GDS_stats,
317 gettext_noop ("# GET requests from clients injected"), 1,
319 reply_bf_mutator = (int32_t) GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
321 reply_bf = GNUNET_BLOCK_construct_bloomfilter (reply_bf_mutator,
323 cqr->seen_replies_count);
324 peer_bf = GNUNET_CONTAINER_bloomfilter_init (NULL,
326 GNUNET_CONSTANTS_BLOOMFILTER_K);
327 GDS_NEIGHBOURS_handle_get (cqr->type,
337 GNUNET_CONTAINER_bloomfilter_free (reply_bf);
338 GNUNET_CONTAINER_bloomfilter_free (peer_bf);
340 /* exponential back-off for retries, max 1h */
341 cqr->retry_frequency =
342 GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_HOURS,
343 GNUNET_TIME_relative_multiply (cqr->retry_frequency, 2));
344 cqr->retry_time = GNUNET_TIME_relative_to_absolute (cqr->retry_frequency);
349 * Task that looks at the 'retry_heap' and transmits all of the requests
350 * on the heap that are ready for transmission. Then re-schedules
351 * itself (unless the heap is empty).
354 * @param tc scheduler context
357 transmit_next_request_task (void *cls,
358 const struct GNUNET_SCHEDULER_TaskContext *tc)
360 struct ClientQueryRecord *cqr;
361 struct GNUNET_TIME_Relative delay;
363 retry_task = GNUNET_SCHEDULER_NO_TASK;
364 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
366 while (NULL != (cqr = GNUNET_CONTAINER_heap_remove_root (retry_heap)))
369 delay = GNUNET_TIME_absolute_get_remaining (cqr->retry_time);
370 if (delay.rel_value > 0)
372 cqr->hnode = GNUNET_CONTAINER_heap_insert (retry_heap, cqr,
373 cqr->retry_time.abs_value);
374 retry_task = GNUNET_SCHEDULER_add_delayed (delay,
375 &transmit_next_request_task,
379 transmit_request (cqr);
380 cqr->hnode = GNUNET_CONTAINER_heap_insert (retry_heap, cqr,
381 cqr->retry_time.abs_value);
387 * Handler for PUT messages.
389 * @param cls closure for the service
390 * @param client the client we received this message from
391 * @param message the actual message received
394 handle_dht_local_put (void *cls, struct GNUNET_SERVER_Client *client,
395 const struct GNUNET_MessageHeader *message)
397 const struct GNUNET_DHT_ClientPutMessage *dht_msg;
398 struct GNUNET_CONTAINER_BloomFilter *peer_bf;
401 size = ntohs (message->size);
402 if (size < sizeof (struct GNUNET_DHT_ClientPutMessage))
405 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
408 GNUNET_STATISTICS_update (GDS_stats,
409 gettext_noop ("# PUT requests received from clients"), 1,
411 dht_msg = (const struct GNUNET_DHT_ClientPutMessage *) message;
412 /* give to local clients */
413 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
414 "Passing %u-byte reply for query %s to local clients\n",
415 size - sizeof (struct GNUNET_DHT_ClientPutMessage),
416 GNUNET_h2s (&dht_msg->key));
417 GDS_CLIENTS_handle_reply (GNUNET_TIME_absolute_ntoh (dht_msg->expiration),
421 ntohl (dht_msg->type),
422 size - sizeof (struct GNUNET_DHT_ClientPutMessage),
425 GDS_DATACACHE_handle_put (GNUNET_TIME_absolute_ntoh (dht_msg->expiration),
428 ntohl (dht_msg->type),
429 size - sizeof (struct GNUNET_DHT_ClientPutMessage),
431 /* route to other peers */
432 peer_bf = GNUNET_CONTAINER_bloomfilter_init (NULL,
434 GNUNET_CONSTANTS_BLOOMFILTER_K);
435 GDS_NEIGHBOURS_handle_put (ntohl (dht_msg->type),
436 ntohl (dht_msg->options),
437 ntohl (dht_msg->desired_replication_level),
438 GNUNET_TIME_absolute_ntoh (dht_msg->expiration),
444 size - sizeof (struct GNUNET_DHT_ClientPutMessage));
445 GNUNET_CONTAINER_bloomfilter_free (peer_bf);
446 GNUNET_SERVER_receive_done (client, GNUNET_OK);
451 * Handler for any generic DHT messages, calls the appropriate handler
452 * depending on message type, sends confirmation if responses aren't otherwise
455 * @param cls closure for the service
456 * @param client the client we received this message from
457 * @param message the actual message received
460 handle_dht_local_get (void *cls, struct GNUNET_SERVER_Client *client,
461 const struct GNUNET_MessageHeader *message)
463 const struct GNUNET_DHT_ClientGetMessage *get;
464 struct ClientQueryRecord *cqr;
469 size = ntohs (message->size);
470 if (size < sizeof (struct GNUNET_DHT_ClientGetMessage))
473 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
476 xquery_size = size - sizeof (struct GNUNET_DHT_ClientGetMessage);
477 get = (const struct GNUNET_DHT_ClientGetMessage *) message;
478 xquery = (const char*) &get[1];
479 GNUNET_STATISTICS_update (GDS_stats,
480 gettext_noop ("# GET requests received from clients"), 1,
482 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
483 "Received request for %s from local client %p\n",
484 GNUNET_h2s (&get->key),
486 cqr = GNUNET_malloc (sizeof (struct ClientQueryRecord) + xquery_size);
488 cqr->client = find_active_client (client);
489 cqr->xquery = (void*) &cqr[1];
490 memcpy (&cqr[1], xquery, xquery_size);
491 cqr->hnode = GNUNET_CONTAINER_heap_insert (retry_heap, cqr, 0);
492 cqr->retry_frequency = GNUNET_TIME_UNIT_MILLISECONDS;
493 cqr->retry_time = GNUNET_TIME_absolute_get ();
494 cqr->unique_id = get->unique_id;
495 cqr->xquery_size = xquery_size;
496 cqr->replication = ntohl (get->desired_replication_level);
497 cqr->msg_options = ntohl (get->options);
498 cqr->type = ntohl (get->type);
499 GNUNET_CONTAINER_multihashmap_put (forward_map, &get->key, cqr,
500 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
501 /* start remote requests */
502 if (GNUNET_SCHEDULER_NO_TASK != retry_task)
503 GNUNET_SCHEDULER_cancel (retry_task);
504 retry_task = GNUNET_SCHEDULER_add_now (&transmit_next_request_task, NULL);
505 /* perform local lookup */
506 GDS_DATACACHE_handle_get (&get->key,
511 GNUNET_SERVER_receive_done (client, GNUNET_OK);
516 * Closure for 'remove_by_unique_id'.
518 struct RemoveByUniqueIdContext
521 * Client that issued the removal request.
523 struct ClientList *client;
526 * Unique ID of the request.
533 * Iterator over hash map entries that frees all entries
534 * that match the given client and unique ID.
536 * @param cls unique ID and client to search for in source routes
537 * @param key current key code
538 * @param value value in the hash map, a ClientQueryRecord
539 * @return GNUNET_YES (we should continue to iterate)
542 remove_by_unique_id (void *cls, const GNUNET_HashCode * key, void *value)
544 const struct RemoveByUniqueIdContext *ctx = cls;
545 struct ClientQueryRecord *record = value;
547 if (record->unique_id != ctx->unique_id)
549 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
550 "Removing client %p's record for key %s (by unique id)\n",
551 ctx->client->client_handle,
553 return remove_client_records (ctx->client, key, record);
558 * Handler for any generic DHT stop messages, calls the appropriate handler
559 * depending on message type (if processed locally)
561 * @param cls closure for the service
562 * @param client the client we received this message from
563 * @param message the actual message received
567 handle_dht_local_get_stop (void *cls, struct GNUNET_SERVER_Client *client,
568 const struct GNUNET_MessageHeader *message)
570 const struct GNUNET_DHT_ClientGetStopMessage *dht_stop_msg =
571 (const struct GNUNET_DHT_ClientGetStopMessage *) message;
572 struct RemoveByUniqueIdContext ctx;
574 GNUNET_STATISTICS_update (GDS_stats,
575 gettext_noop ("# GET STOP requests received from clients"), 1,
577 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
578 "Client %p stopped request for key %s\n",
580 GNUNET_h2s (&dht_stop_msg->key));
581 ctx.client = find_active_client (client);
582 ctx.unique_id = dht_stop_msg->unique_id;
583 GNUNET_CONTAINER_multihashmap_get_multiple (forward_map,
585 &remove_by_unique_id,
587 GNUNET_SERVER_receive_done (client, GNUNET_OK);
592 * Task run to check for messages that need to be sent to a client.
594 * @param client a ClientList, containing the client and any messages to be sent to it
597 process_pending_messages (struct ClientList *client);
601 * Callback called as a result of issuing a GNUNET_SERVER_notify_transmit_ready
602 * request. A ClientList is passed as closure, take the head of the list
603 * and copy it into buf, which has the result of sending the message to the
606 * @param cls closure to this call
607 * @param size maximum number of bytes available to send
608 * @param buf where to copy the actual message to
610 * @return the number of bytes actually copied, 0 indicates failure
613 send_reply_to_client (void *cls, size_t size, void *buf)
615 struct ClientList *client = cls;
617 struct PendingMessage *reply;
621 client->transmit_handle = NULL;
624 /* client disconnected */
625 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
626 "Client %p disconnected, pending messages will be discarded\n",
627 client->client_handle);
631 while ((NULL != (reply = client->pending_head)) &&
632 (size >= off + (msize = ntohs (reply->msg->size))))
634 GNUNET_CONTAINER_DLL_remove (client->pending_head, client->pending_tail,
636 memcpy (&cbuf[off], reply->msg, msize);
638 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
639 "Transmitting %u bytes to client %p\n",
641 client->client_handle);
644 process_pending_messages (client);
645 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
646 "Transmitted %u/%u bytes to client %p\n",
649 client->client_handle);
655 * Task run to check for messages that need to be sent to a client.
657 * @param client a ClientList, containing the client and any messages to be sent to it
660 process_pending_messages (struct ClientList *client)
662 if ((client->pending_head == NULL) || (client->transmit_handle != NULL))
664 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
665 "Not asking for transmission to %p now: %s\n",
666 client->client_handle,
667 client->pending_head == NULL
669 : "request already pending");
672 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
673 "Asking for transmission of %u bytes to client %p\n",
674 ntohs (client->pending_head->
676 client->client_handle);
677 client->transmit_handle =
678 GNUNET_SERVER_notify_transmit_ready (client->client_handle,
679 ntohs (client->pending_head->
681 GNUNET_TIME_UNIT_FOREVER_REL,
682 &send_reply_to_client, client);
687 * Add a PendingMessage to the clients list of messages to be sent
689 * @param client the active client to send the message to
690 * @param pending_message the actual message to send
693 add_pending_message (struct ClientList *client,
694 struct PendingMessage *pending_message)
696 GNUNET_CONTAINER_DLL_insert_tail (client->pending_head, client->pending_tail,
698 process_pending_messages (client);
703 * Closure for 'forward_reply'
705 struct ForwardReplyContext
709 * Actual message to send to matching clients.
711 struct PendingMessage *pm;
721 enum GNUNET_BLOCK_Type type;
724 * Number of bytes in data.
729 * Do we need to copy 'pm' because it was already used?
737 * Iterator over hash map entries that send a given reply to
738 * each of the matching clients. With some tricky recycling
741 * @param cls the 'struct ForwardReplyContext'
742 * @param key current key
743 * @param value value in the hash map, a ClientQueryRecord
744 * @return GNUNET_YES (we should continue to iterate),
745 * if the result is mal-formed, GNUNET_NO
748 forward_reply (void *cls, const GNUNET_HashCode * key, void *value)
750 struct ForwardReplyContext *frc = cls;
751 struct ClientQueryRecord *record = value;
752 struct PendingMessage *pm;
753 struct GNUNET_DHT_ClientResultMessage *reply;
754 enum GNUNET_BLOCK_EvaluationResult eval;
759 if ( (record->type != GNUNET_BLOCK_TYPE_ANY) &&
760 (record->type != frc->type) )
762 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
763 "Record type missmatch, not passing request for key %s to local client\n",
765 GNUNET_STATISTICS_update (GDS_stats,
766 gettext_noop ("# Key match, type mismatches in REPLY to CLIENT"), 1,
768 return GNUNET_YES; /* type mismatch */
770 GNUNET_CRYPTO_hash (frc->data,
773 for (i=0;i<record->seen_replies_count;i++)
774 if (0 == memcmp (&record->seen_replies[i],
776 sizeof (GNUNET_HashCode)))
778 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
779 "Duplicate reply, not passing request for key %s to local client\n",
781 GNUNET_STATISTICS_update (GDS_stats,
782 gettext_noop ("# Duplicate REPLIES to CLIENT request dropped"), 1,
784 return GNUNET_YES; /* duplicate */
787 GNUNET_BLOCK_evaluate (GDS_block_context,
794 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
795 "Evaluation result is %d for key %s for local client's query\n",
800 case GNUNET_BLOCK_EVALUATION_OK_LAST:
801 do_free = GNUNET_YES;
803 case GNUNET_BLOCK_EVALUATION_OK_MORE:
804 GNUNET_array_append (record->seen_replies,
805 record->seen_replies_count,
809 case GNUNET_BLOCK_EVALUATION_OK_DUPLICATE:
810 /* should be impossible to encounter here */
813 case GNUNET_BLOCK_EVALUATION_RESULT_INVALID:
816 case GNUNET_BLOCK_EVALUATION_REQUEST_VALID:
819 case GNUNET_BLOCK_EVALUATION_REQUEST_INVALID:
822 case GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED:
823 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
824 _("Unsupported block type (%u) in request!\n"),
831 if (GNUNET_NO == frc->do_copy)
833 /* first time, we can use the original data */
835 frc->do_copy = GNUNET_YES;
839 /* two clients waiting for same reply, must copy for queueing */
840 pm = GNUNET_malloc (sizeof (struct PendingMessage) +
841 ntohs (frc->pm->msg->size));
843 sizeof (struct PendingMessage) + ntohs (frc->pm->msg->size));
844 pm->next = pm->prev = NULL;
846 GNUNET_STATISTICS_update (GDS_stats,
847 gettext_noop ("# RESULTS queued for clients"), 1,
849 reply = (struct GNUNET_DHT_ClientResultMessage*) &pm[1];
850 reply->unique_id = record->unique_id;
851 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
852 "Queueing reply to query %s for client %p\n",
854 record->client->client_handle);
855 add_pending_message (record->client, pm);
856 if (GNUNET_YES == do_free)
857 remove_client_records (record->client, key, record);
863 * Handle a reply we've received from another peer. If the reply
864 * matches any of our pending queries, forward it to the respective
867 * @param expiration when will the reply expire
868 * @param key the query this reply is for
869 * @param get_path_length number of peers in 'get_path'
870 * @param get_path path the reply took on get
871 * @param put_path_length number of peers in 'put_path'
872 * @param put_path path the reply took on put
873 * @param type type of the reply
874 * @param data_size number of bytes in 'data'
875 * @param data application payload data
878 GDS_CLIENTS_handle_reply (struct GNUNET_TIME_Absolute expiration,
879 const GNUNET_HashCode *key,
880 unsigned int get_path_length,
881 const struct GNUNET_PeerIdentity *get_path,
882 unsigned int put_path_length,
883 const struct GNUNET_PeerIdentity *put_path,
884 enum GNUNET_BLOCK_Type type,
888 struct ForwardReplyContext frc;
889 struct PendingMessage *pm;
890 struct GNUNET_DHT_ClientResultMessage *reply;
891 struct GNUNET_PeerIdentity *paths;
895 GNUNET_CONTAINER_multihashmap_get (forward_map, key))
897 GNUNET_STATISTICS_update (GDS_stats,
898 gettext_noop ("# REPLIES ignored for CLIENTS (no match)"), 1,
900 return; /* no matching request, fast exit! */
902 msize = sizeof(struct GNUNET_DHT_ClientResultMessage) + data_size +
903 (get_path_length + put_path_length) * sizeof (struct GNUNET_PeerIdentity);
904 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
906 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
907 _("Could not pass reply to client, message too big!\n"));
910 pm = (struct PendingMessage *) GNUNET_malloc (msize + sizeof (struct PendingMessage));
911 reply = (struct GNUNET_DHT_ClientResultMessage*) &pm[1];
912 pm->msg = &reply->header;
913 reply->header.size = htons ((uint16_t) msize);
914 reply->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_CLIENT_RESULT);
915 reply->type = htonl (type);
916 reply->get_path_length = htonl (get_path_length);
917 reply->put_path_length = htonl (put_path_length);
918 reply->unique_id = 0; /* filled in later */
919 reply->expiration = GNUNET_TIME_absolute_hton (expiration);
921 paths = (struct GNUNET_PeerIdentity*) &reply[1];
922 memcpy (paths, put_path,
923 sizeof (struct GNUNET_PeerIdentity) * put_path_length);
924 memcpy (&paths[put_path_length],
925 get_path, sizeof (struct GNUNET_PeerIdentity) * get_path_length);
926 memcpy (&paths[get_path_length + put_path_length],
929 frc.do_copy = GNUNET_NO;
932 frc.data_size = data_size;
934 GNUNET_CONTAINER_multihashmap_get_multiple (forward_map, key,
937 if (GNUNET_NO == frc.do_copy)
939 /* did not match any of the requests, free! */
940 GNUNET_STATISTICS_update (GDS_stats,
941 gettext_noop ("# REPLIES ignored for CLIENTS (no match)"), 1,
949 * Initialize client subsystem.
951 * @param server the initialized server
954 GDS_CLIENTS_init (struct GNUNET_SERVER_Handle *server)
956 static struct GNUNET_SERVER_MessageHandler plugin_handlers[] = {
957 {&handle_dht_local_put, NULL,
958 GNUNET_MESSAGE_TYPE_DHT_CLIENT_PUT, 0},
959 {&handle_dht_local_get, NULL,
960 GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET, 0},
961 {&handle_dht_local_get_stop, NULL,
962 GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET_STOP,
963 sizeof (struct GNUNET_DHT_ClientGetStopMessage) },
966 forward_map = GNUNET_CONTAINER_multihashmap_create (1024);
967 retry_heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
968 GNUNET_SERVER_add_handlers (server, plugin_handlers);
969 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
974 * Shutdown client subsystem.
979 GNUNET_assert (client_head == NULL);
980 GNUNET_assert (client_tail == NULL);
981 if (GNUNET_SCHEDULER_NO_TASK != retry_task)
983 GNUNET_SCHEDULER_cancel (retry_task);
984 retry_task = GNUNET_SCHEDULER_NO_TASK;
986 GNUNET_assert (0 == GNUNET_CONTAINER_heap_get_size (retry_heap));
987 GNUNET_CONTAINER_heap_destroy (retry_heap);
989 GNUNET_assert (0 == GNUNET_CONTAINER_multihashmap_size (forward_map));
990 GNUNET_CONTAINER_multihashmap_destroy (forward_map);
994 /* end of gnunet-service-dht_clients.c */