2 This file is part of GNUnet.
3 (C) 2009, 2010, 2011 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.
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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,
18 Boston, MA 02111-1307, USA.
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 * Struct containing paremeters of monitoring requests.
183 struct ClientMonitorRecord
187 * Next element in DLL.
189 struct ClientMonitorRecord *next;
192 * Previous element in DLL.
194 struct ClientMonitorRecord *prev;
197 * Type of blocks that are of interest
199 enum GNUNET_BLOCK_Type type;
202 * Key of data of interest, NULL for all.
204 GNUNET_HashCode *key;
207 * Client to notify of these requests.
209 struct ClientList *client;
214 * List of active clients.
216 static struct ClientList *client_head;
219 * List of active clients.
221 static struct ClientList *client_tail;
224 * List of active monitoring requests.
226 static struct ClientMonitorRecord *monitor_head;
229 * List of active monitoring requests.
231 static struct ClientMonitorRecord *monitor_tail;
234 * Hashmap for fast key based lookup, maps keys to 'struct ClientQueryRecord' entries.
236 static struct GNUNET_CONTAINER_MultiHashMap *forward_map;
239 * Heap with all of our client's request, sorted by retry time (earliest on top).
241 static struct GNUNET_CONTAINER_Heap *retry_heap;
244 * Task that re-transmits requests (using retry_heap).
246 static GNUNET_SCHEDULER_TaskIdentifier retry_task;
250 * Find a client if it exists, add it otherwise.
252 * @param client the server handle to the client
254 * @return the client if found, a new client otherwise
256 static struct ClientList *
257 find_active_client (struct GNUNET_SERVER_Client *client)
259 struct ClientList *pos = client_head;
260 struct ClientList *ret;
264 if (pos->client_handle == client)
268 ret = GNUNET_malloc (sizeof (struct ClientList));
269 ret->client_handle = client;
270 GNUNET_CONTAINER_DLL_insert (client_head, client_tail, ret);
276 * Iterator over hash map entries that frees all entries
277 * associated with the given client.
279 * @param cls client to search for in source routes
280 * @param key current key code (ignored)
281 * @param value value in the hash map, a ClientQueryRecord
282 * @return GNUNET_YES (we should continue to iterate)
285 remove_client_records (void *cls, const GNUNET_HashCode * key, void *value)
287 struct ClientList *client = cls;
288 struct ClientQueryRecord *record = value;
290 if (record->client != client)
293 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
294 "Removing client %p's record for key %s\n", client,
297 GNUNET_assert (GNUNET_YES ==
298 GNUNET_CONTAINER_multihashmap_remove (forward_map, key,
300 if (NULL != record->hnode)
301 GNUNET_CONTAINER_heap_remove_node (record->hnode);
302 GNUNET_array_grow (record->seen_replies, record->seen_replies_count, 0);
303 GNUNET_free (record);
309 * Functions with this signature are called whenever a client
310 * is disconnected on the network level.
312 * @param cls closure (NULL for dht)
313 * @param client identification of the client; NULL
314 * for the last call when the server is destroyed
317 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
319 struct ClientList *pos;
320 struct PendingMessage *reply;
321 struct ClientMonitorRecord *monitor;
324 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Local client %p disconnects\n", client);
326 pos = find_active_client (client);
327 GNUNET_CONTAINER_DLL_remove (client_head, client_tail, pos);
328 if (pos->transmit_handle != NULL)
329 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->transmit_handle);
330 while (NULL != (reply = pos->pending_head))
332 GNUNET_CONTAINER_DLL_remove (pos->pending_head, pos->pending_tail, reply);
335 monitor = monitor_head;
336 while (NULL != monitor)
338 if (monitor->client == pos)
340 struct ClientMonitorRecord *next;
342 GNUNET_free_non_null (monitor->key);
343 next = monitor->next;
344 GNUNET_CONTAINER_DLL_remove (monitor_head, monitor_tail, monitor);
345 GNUNET_free (monitor);
349 monitor = monitor->next;
351 GNUNET_CONTAINER_multihashmap_iterate (forward_map, &remove_client_records,
358 * Route the given request via the DHT. This includes updating
359 * the bloom filter and retransmission times, building the P2P
360 * message and initiating the routing operation.
363 transmit_request (struct ClientQueryRecord *cqr)
365 int32_t reply_bf_mutator;
366 struct GNUNET_CONTAINER_BloomFilter *reply_bf;
367 struct GNUNET_CONTAINER_BloomFilter *peer_bf;
369 GNUNET_STATISTICS_update (GDS_stats,
371 ("# GET requests from clients injected"), 1,
374 (int32_t) GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
377 GNUNET_BLOCK_construct_bloomfilter (reply_bf_mutator, cqr->seen_replies,
378 cqr->seen_replies_count);
380 GNUNET_CONTAINER_bloomfilter_init (NULL, DHT_BLOOM_SIZE,
381 GNUNET_CONSTANTS_BLOOMFILTER_K);
382 GDS_NEIGHBOURS_handle_get (cqr->type, cqr->msg_options, cqr->replication,
384 &cqr->key, cqr->xquery, cqr->xquery_size, reply_bf,
385 reply_bf_mutator, peer_bf);
386 GNUNET_CONTAINER_bloomfilter_free (reply_bf);
387 GNUNET_CONTAINER_bloomfilter_free (peer_bf);
389 /* exponential back-off for retries, max 1h */
390 cqr->retry_frequency =
391 GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_HOURS,
392 GNUNET_TIME_relative_multiply
393 (cqr->retry_frequency, 2));
394 cqr->retry_time = GNUNET_TIME_relative_to_absolute (cqr->retry_frequency);
399 * Task that looks at the 'retry_heap' and transmits all of the requests
400 * on the heap that are ready for transmission. Then re-schedules
401 * itself (unless the heap is empty).
404 * @param tc scheduler context
407 transmit_next_request_task (void *cls,
408 const struct GNUNET_SCHEDULER_TaskContext *tc)
410 struct ClientQueryRecord *cqr;
411 struct GNUNET_TIME_Relative delay;
413 retry_task = GNUNET_SCHEDULER_NO_TASK;
414 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
416 while (NULL != (cqr = GNUNET_CONTAINER_heap_remove_root (retry_heap)))
419 delay = GNUNET_TIME_absolute_get_remaining (cqr->retry_time);
420 if (delay.rel_value > 0)
423 GNUNET_CONTAINER_heap_insert (retry_heap, cqr,
424 cqr->retry_time.abs_value);
426 GNUNET_SCHEDULER_add_delayed (delay, &transmit_next_request_task,
430 transmit_request (cqr);
432 GNUNET_CONTAINER_heap_insert (retry_heap, cqr,
433 cqr->retry_time.abs_value);
439 * Handler for PUT messages.
441 * @param cls closure for the service
442 * @param client the client we received this message from
443 * @param message the actual message received
446 handle_dht_local_put (void *cls, struct GNUNET_SERVER_Client *client,
447 const struct GNUNET_MessageHeader *message)
449 const struct GNUNET_DHT_ClientPutMessage *dht_msg;
450 struct GNUNET_CONTAINER_BloomFilter *peer_bf;
453 size = ntohs (message->size);
454 if (size < sizeof (struct GNUNET_DHT_ClientPutMessage))
457 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
460 GNUNET_STATISTICS_update (GDS_stats,
462 ("# PUT requests received from clients"), 1,
464 dht_msg = (const struct GNUNET_DHT_ClientPutMessage *) message;
465 /* give to local clients */
467 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
468 "Handling local PUT of %u-bytes for query %s\n",
469 size - sizeof (struct GNUNET_DHT_ClientPutMessage),
470 GNUNET_h2s (&dht_msg->key));
472 GDS_CLIENTS_handle_reply (GNUNET_TIME_absolute_ntoh (dht_msg->expiration),
473 &dht_msg->key, 0, NULL, 0, NULL,
474 ntohl (dht_msg->type),
475 size - sizeof (struct GNUNET_DHT_ClientPutMessage),
478 GDS_DATACACHE_handle_put (GNUNET_TIME_absolute_ntoh (dht_msg->expiration),
479 &dht_msg->key, 0, NULL, ntohl (dht_msg->type),
480 size - sizeof (struct GNUNET_DHT_ClientPutMessage),
482 /* route to other peers */
484 GNUNET_CONTAINER_bloomfilter_init (NULL, DHT_BLOOM_SIZE,
485 GNUNET_CONSTANTS_BLOOMFILTER_K);
486 GDS_NEIGHBOURS_handle_put (ntohl (dht_msg->type), ntohl (dht_msg->options),
487 ntohl (dht_msg->desired_replication_level),
488 GNUNET_TIME_absolute_ntoh (dht_msg->expiration),
490 peer_bf, &dht_msg->key, 0, NULL, &dht_msg[1],
492 sizeof (struct GNUNET_DHT_ClientPutMessage));
493 GDS_CLIENTS_process_monitor (GNUNET_MESSAGE_TYPE_DHT_MONITOR_PUT,
494 GNUNET_TIME_absolute_ntoh (dht_msg->expiration), &dht_msg->key,
495 1, GDS_NEIGHBOURS_get_id(), 0, NULL,
496 ntohl (dht_msg->desired_replication_level),
497 ntohl (dht_msg->type), &(dht_msg[1].header),
498 size - sizeof (struct GNUNET_DHT_ClientPutMessage));
499 GNUNET_CONTAINER_bloomfilter_free (peer_bf);
500 GNUNET_SERVER_receive_done (client, GNUNET_OK);
505 * Handler for any generic DHT messages, calls the appropriate handler
506 * depending on message type, sends confirmation if responses aren't otherwise
509 * @param cls closure for the service
510 * @param client the client we received this message from
511 * @param message the actual message received
514 handle_dht_local_get (void *cls, struct GNUNET_SERVER_Client *client,
515 const struct GNUNET_MessageHeader *message)
517 const struct GNUNET_DHT_ClientGetMessage *get;
518 struct ClientQueryRecord *cqr;
523 size = ntohs (message->size);
524 if (size < sizeof (struct GNUNET_DHT_ClientGetMessage))
527 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
530 xquery_size = size - sizeof (struct GNUNET_DHT_ClientGetMessage);
531 get = (const struct GNUNET_DHT_ClientGetMessage *) message;
532 xquery = (const char *) &get[1];
533 GNUNET_STATISTICS_update (GDS_stats,
535 ("# GET requests received from clients"), 1,
538 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
539 "Received request for %s from local client %p\n",
540 GNUNET_h2s (&get->key), client);
542 cqr = GNUNET_malloc (sizeof (struct ClientQueryRecord) + xquery_size);
544 cqr->client = find_active_client (client);
545 cqr->xquery = (void *) &cqr[1];
546 memcpy (&cqr[1], xquery, xquery_size);
547 cqr->hnode = GNUNET_CONTAINER_heap_insert (retry_heap, cqr, 0);
548 cqr->retry_frequency = GNUNET_TIME_UNIT_MILLISECONDS;
549 cqr->retry_time = GNUNET_TIME_absolute_get ();
550 cqr->unique_id = get->unique_id;
551 cqr->xquery_size = xquery_size;
552 cqr->replication = ntohl (get->desired_replication_level);
553 cqr->msg_options = ntohl (get->options);
554 cqr->type = ntohl (get->type);
555 GNUNET_CONTAINER_multihashmap_put (forward_map, &get->key, cqr,
556 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
557 GDS_CLIENTS_process_monitor (GNUNET_MESSAGE_TYPE_DHT_MONITOR_GET,
558 GNUNET_TIME_UNIT_FOREVER_ABS, &get->key,
559 0, NULL, 1, GDS_NEIGHBOURS_get_id(),
560 ntohl (get->desired_replication_level),
561 ntohl (get->type), NULL, 0);
562 /* start remote requests */
563 if (GNUNET_SCHEDULER_NO_TASK != retry_task)
564 GNUNET_SCHEDULER_cancel (retry_task);
565 retry_task = GNUNET_SCHEDULER_add_now (&transmit_next_request_task, NULL);
566 /* perform local lookup */
567 GDS_DATACACHE_handle_get (&get->key, cqr->type, cqr->xquery, xquery_size,
569 GNUNET_SERVER_receive_done (client, GNUNET_OK);
574 * Closure for 'remove_by_unique_id'.
576 struct RemoveByUniqueIdContext
579 * Client that issued the removal request.
581 struct ClientList *client;
584 * Unique ID of the request.
591 * Iterator over hash map entries that frees all entries
592 * that match the given client and unique ID.
594 * @param cls unique ID and client to search for in source routes
595 * @param key current key code
596 * @param value value in the hash map, a ClientQueryRecord
597 * @return GNUNET_YES (we should continue to iterate)
600 remove_by_unique_id (void *cls, const GNUNET_HashCode * key, void *value)
602 const struct RemoveByUniqueIdContext *ctx = cls;
603 struct ClientQueryRecord *record = value;
605 if (record->unique_id != ctx->unique_id)
608 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
609 "Removing client %p's record for key %s (by unique id)\n",
610 ctx->client->client_handle, GNUNET_h2s (key));
612 return remove_client_records (ctx->client, key, record);
617 * Handler for any generic DHT stop messages, calls the appropriate handler
618 * depending on message type (if processed locally)
620 * @param cls closure for the service
621 * @param client the client we received this message from
622 * @param message the actual message received
626 handle_dht_local_get_stop (void *cls, struct GNUNET_SERVER_Client *client,
627 const struct GNUNET_MessageHeader *message)
629 const struct GNUNET_DHT_ClientGetStopMessage *dht_stop_msg =
630 (const struct GNUNET_DHT_ClientGetStopMessage *) message;
631 struct RemoveByUniqueIdContext ctx;
633 GNUNET_STATISTICS_update (GDS_stats,
635 ("# GET STOP requests received from clients"), 1,
638 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client %p stopped request for key %s\n",
639 client, GNUNET_h2s (&dht_stop_msg->key));
641 ctx.client = find_active_client (client);
642 ctx.unique_id = dht_stop_msg->unique_id;
643 GNUNET_CONTAINER_multihashmap_get_multiple (forward_map, &dht_stop_msg->key,
644 &remove_by_unique_id, &ctx);
645 GNUNET_SERVER_receive_done (client, GNUNET_OK);
650 * Handler for monitor messages
652 * @param cls closure for the service
653 * @param client the client we received this message from
654 * @param message the actual message received
658 handle_dht_local_monitor (void *cls, struct GNUNET_SERVER_Client *client,
659 const struct GNUNET_MessageHeader *message)
661 struct ClientMonitorRecord *r;
662 const struct GNUNET_DHT_MonitorMessage *msg;
666 msg = (struct GNUNET_DHT_MonitorMessage *) message;
667 r = GNUNET_malloc (sizeof(struct ClientMonitorRecord));
669 r->client = find_active_client(client);
670 r->type = ntohl(msg->type);
671 c = (char *) &msg->key;
672 for (i = 0; i < sizeof (GNUNET_HashCode) && c[i] == 0; i++);
673 if (sizeof (GNUNET_HashCode) == i)
677 r->key = GNUNET_malloc (sizeof (GNUNET_HashCode));
678 memcpy (r->key, &msg->key, sizeof (GNUNET_HashCode));
680 GNUNET_CONTAINER_DLL_insert (monitor_head, monitor_tail, r);
681 // FIXME add remove somewhere
682 GNUNET_SERVER_receive_done (client, GNUNET_OK);
687 * Task run to check for messages that need to be sent to a client.
689 * @param client a ClientList, containing the client and any messages to be sent to it
692 process_pending_messages (struct ClientList *client);
696 * Callback called as a result of issuing a GNUNET_SERVER_notify_transmit_ready
697 * request. A ClientList is passed as closure, take the head of the list
698 * and copy it into buf, which has the result of sending the message to the
701 * @param cls closure to this call
702 * @param size maximum number of bytes available to send
703 * @param buf where to copy the actual message to
705 * @return the number of bytes actually copied, 0 indicates failure
708 send_reply_to_client (void *cls, size_t size, void *buf)
710 struct ClientList *client = cls;
712 struct PendingMessage *reply;
716 client->transmit_handle = NULL;
719 /* client disconnected */
721 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
722 "Client %p disconnected, pending messages will be discarded\n",
723 client->client_handle);
728 while ((NULL != (reply = client->pending_head)) &&
729 (size >= off + (msize = ntohs (reply->msg->size))))
731 GNUNET_CONTAINER_DLL_remove (client->pending_head, client->pending_tail,
733 memcpy (&cbuf[off], reply->msg, msize);
736 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transmitting %u bytes to client %p\n",
737 msize, client->client_handle);
741 process_pending_messages (client);
743 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transmitted %u/%u bytes to client %p\n",
744 (unsigned int) off, (unsigned int) size, client->client_handle);
751 * Task run to check for messages that need to be sent to a client.
753 * @param client a ClientList, containing the client and any messages to be sent to it
756 process_pending_messages (struct ClientList *client)
758 if ((client->pending_head == NULL) || (client->transmit_handle != NULL))
761 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
762 "Not asking for transmission to %p now: %s\n",
763 client->client_handle,
764 client->pending_head ==
765 NULL ? "no more messages" : "request already pending");
770 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
771 "Asking for transmission of %u bytes to client %p\n",
772 ntohs (client->pending_head->msg->size), client->client_handle);
774 client->transmit_handle =
775 GNUNET_SERVER_notify_transmit_ready (client->client_handle,
776 ntohs (client->pending_head->
778 GNUNET_TIME_UNIT_FOREVER_REL,
779 &send_reply_to_client, client);
784 * Add a PendingMessage to the clients list of messages to be sent
786 * @param client the active client to send the message to
787 * @param pending_message the actual message to send
790 add_pending_message (struct ClientList *client,
791 struct PendingMessage *pending_message)
793 GNUNET_CONTAINER_DLL_insert_tail (client->pending_head, client->pending_tail,
795 process_pending_messages (client);
800 * Closure for 'forward_reply'
802 struct ForwardReplyContext
806 * Actual message to send to matching clients.
808 struct PendingMessage *pm;
818 enum GNUNET_BLOCK_Type type;
821 * Number of bytes in data.
826 * Do we need to copy 'pm' because it was already used?
834 * Iterator over hash map entries that send a given reply to
835 * each of the matching clients. With some tricky recycling
838 * @param cls the 'struct ForwardReplyContext'
839 * @param key current key
840 * @param value value in the hash map, a ClientQueryRecord
841 * @return GNUNET_YES (we should continue to iterate),
842 * if the result is mal-formed, GNUNET_NO
845 forward_reply (void *cls, const GNUNET_HashCode * key, void *value)
847 struct ForwardReplyContext *frc = cls;
848 struct ClientQueryRecord *record = value;
849 struct PendingMessage *pm;
850 struct GNUNET_DHT_ClientResultMessage *reply;
851 enum GNUNET_BLOCK_EvaluationResult eval;
856 if ((record->type != GNUNET_BLOCK_TYPE_ANY) && (record->type != frc->type))
859 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
860 "Record type missmatch, not passing request for key %s to local client\n",
863 GNUNET_STATISTICS_update (GDS_stats,
865 ("# Key match, type mismatches in REPLY to CLIENT"),
867 return GNUNET_YES; /* type mismatch */
869 GNUNET_CRYPTO_hash (frc->data, frc->data_size, &ch);
870 for (i = 0; i < record->seen_replies_count; i++)
871 if (0 == memcmp (&record->seen_replies[i], &ch, sizeof (GNUNET_HashCode)))
874 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
875 "Duplicate reply, not passing request for key %s to local client\n",
878 GNUNET_STATISTICS_update (GDS_stats,
880 ("# Duplicate REPLIES to CLIENT request dropped"),
882 return GNUNET_YES; /* duplicate */
885 GNUNET_BLOCK_evaluate (GDS_block_context, record->type, key, NULL, 0,
886 record->xquery, record->xquery_size, frc->data,
889 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
890 "Evaluation result is %d for key %s for local client's query\n",
891 (int) eval, GNUNET_h2s (key));
895 case GNUNET_BLOCK_EVALUATION_OK_LAST:
896 do_free = GNUNET_YES;
898 case GNUNET_BLOCK_EVALUATION_OK_MORE:
899 GNUNET_array_append (record->seen_replies, record->seen_replies_count, ch);
902 case GNUNET_BLOCK_EVALUATION_OK_DUPLICATE:
903 /* should be impossible to encounter here */
906 case GNUNET_BLOCK_EVALUATION_RESULT_INVALID:
909 case GNUNET_BLOCK_EVALUATION_REQUEST_VALID:
912 case GNUNET_BLOCK_EVALUATION_REQUEST_INVALID:
915 case GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED:
916 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
917 _("Unsupported block type (%u) in request!\n"), record->type);
923 if (GNUNET_NO == frc->do_copy)
925 /* first time, we can use the original data */
927 frc->do_copy = GNUNET_YES;
931 /* two clients waiting for same reply, must copy for queueing */
932 pm = GNUNET_malloc (sizeof (struct PendingMessage) +
933 ntohs (frc->pm->msg->size));
935 sizeof (struct PendingMessage) + ntohs (frc->pm->msg->size));
936 pm->next = pm->prev = NULL;
938 GNUNET_STATISTICS_update (GDS_stats,
939 gettext_noop ("# RESULTS queued for clients"), 1,
941 reply = (struct GNUNET_DHT_ClientResultMessage *) &pm[1];
942 reply->unique_id = record->unique_id;
944 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
945 "Queueing reply to query %s for client %p\n", GNUNET_h2s (key),
946 record->client->client_handle);
948 add_pending_message (record->client, pm);
949 if (GNUNET_YES == do_free)
950 remove_client_records (record->client, key, record);
956 * Handle a reply we've received from another peer. If the reply
957 * matches any of our pending queries, forward it to the respective
960 * @param expiration when will the reply expire
961 * @param key the query this reply is for
962 * @param get_path_length number of peers in 'get_path'
963 * @param get_path path the reply took on get
964 * @param put_path_length number of peers in 'put_path'
965 * @param put_path path the reply took on put
966 * @param type type of the reply
967 * @param data_size number of bytes in 'data'
968 * @param data application payload data
971 GDS_CLIENTS_handle_reply (struct GNUNET_TIME_Absolute expiration,
972 const GNUNET_HashCode * key,
973 unsigned int get_path_length,
974 const struct GNUNET_PeerIdentity *get_path,
975 unsigned int put_path_length,
976 const struct GNUNET_PeerIdentity *put_path,
977 enum GNUNET_BLOCK_Type type, size_t data_size,
980 struct ForwardReplyContext frc;
981 struct PendingMessage *pm;
982 struct GNUNET_DHT_ClientResultMessage *reply;
983 struct GNUNET_PeerIdentity *paths;
986 if (NULL == GNUNET_CONTAINER_multihashmap_get (forward_map, key))
988 GNUNET_STATISTICS_update (GDS_stats,
990 ("# REPLIES ignored for CLIENTS (no match)"), 1,
992 return; /* no matching request, fast exit! */
995 sizeof (struct GNUNET_DHT_ClientResultMessage) + data_size +
996 (get_path_length + put_path_length) * sizeof (struct GNUNET_PeerIdentity);
997 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
999 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1000 _("Could not pass reply to client, message too big!\n"));
1003 pm = (struct PendingMessage *) GNUNET_malloc (msize +
1004 sizeof (struct PendingMessage));
1005 reply = (struct GNUNET_DHT_ClientResultMessage *) &pm[1];
1006 pm->msg = &reply->header;
1007 reply->header.size = htons ((uint16_t) msize);
1008 reply->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_CLIENT_RESULT);
1009 reply->type = htonl (type);
1010 reply->get_path_length = htonl (get_path_length);
1011 reply->put_path_length = htonl (put_path_length);
1012 reply->unique_id = 0; /* filled in later */
1013 reply->expiration = GNUNET_TIME_absolute_hton (expiration);
1015 paths = (struct GNUNET_PeerIdentity *) &reply[1];
1016 memcpy (paths, put_path,
1017 sizeof (struct GNUNET_PeerIdentity) * put_path_length);
1018 memcpy (&paths[put_path_length], get_path,
1019 sizeof (struct GNUNET_PeerIdentity) * get_path_length);
1020 memcpy (&paths[get_path_length + put_path_length], data, data_size);
1021 frc.do_copy = GNUNET_NO;
1024 frc.data_size = data_size;
1026 GNUNET_CONTAINER_multihashmap_get_multiple (forward_map, key, &forward_reply,
1028 if (GNUNET_NO == frc.do_copy)
1030 /* did not match any of the requests, free! */
1031 GNUNET_STATISTICS_update (GDS_stats,
1033 ("# REPLIES ignored for CLIENTS (no match)"), 1,
1041 * Check if some client is monitoring messages of this type and notify
1044 * @param mtype Type of the DHT message.
1045 * @param exp When will this value expire.
1046 * @param key Key of the result/request.
1047 * @param putl number of entries in get_path.
1048 * @param put_path peers on the PUT path (or NULL if not recorded).
1049 * @param getl number of entries in get_path.
1050 * @param get_path Peers on reply path (or NULL if not recorded).
1051 * @param desired_replication_level Desired replication level.
1052 * @param type Type of the result/request.
1053 * @param data Pointer to the result data.
1054 * @param size Number of bytes in data.
1057 GDS_CLIENTS_process_monitor (uint16_t mtype,
1058 const struct GNUNET_TIME_Absolute exp,
1059 const GNUNET_HashCode *key,
1061 const struct GNUNET_PeerIdentity *put_path,
1063 const struct GNUNET_PeerIdentity *get_path,
1064 uint32_t desired_replication_level,
1065 enum GNUNET_BLOCK_Type type,
1066 const struct GNUNET_MessageHeader *data,
1069 struct ClientMonitorRecord *m;
1070 struct ClientList **cl;
1071 unsigned int cl_size;
1075 for (m = monitor_head; NULL != m; m = m->next)
1077 if ((GNUNET_BLOCK_TYPE_ANY == m->type || m->type == type) &&
1079 memcmp (key, m->key, sizeof(GNUNET_HashCode)) == 0))
1081 struct PendingMessage *pm;
1082 struct GNUNET_DHT_MonitorMessage *mmsg;
1083 struct GNUNET_PeerIdentity *path;
1087 /* Don't send duplicates */
1088 for (i = 0; i < cl_size; i++)
1089 if (cl[i] == m->client)
1093 GNUNET_array_append (cl, cl_size, m->client);
1096 msize += (getl + putl) * sizeof (struct GNUNET_PeerIdentity);
1097 msize += sizeof (struct GNUNET_DHT_MonitorMessage);
1098 msize += sizeof (struct PendingMessage);
1099 pm = (struct PendingMessage *) GNUNET_malloc (msize);
1100 mmsg = (struct GNUNET_DHT_MonitorMessage *) &pm[1];
1101 pm->msg = (struct GNUNET_MessageHeader *) mmsg;
1102 mmsg->header.size = htons (msize - sizeof (struct PendingMessage));
1103 mmsg->header.type = htons (mtype);
1104 mmsg->expiration = GNUNET_TIME_absolute_hton(exp);
1105 memcpy (&mmsg->key, key, sizeof (GNUNET_HashCode));
1106 mmsg->put_path_length = htonl(putl);
1107 mmsg->get_path_length = htonl(getl);
1108 mmsg->desired_replication_level = htonl (desired_replication_level);
1109 path = (struct GNUNET_PeerIdentity *) &mmsg[1];
1112 memcpy (path, put_path, putl * sizeof (struct GNUNET_PeerIdentity));
1116 memcpy (path, get_path, getl * sizeof (struct GNUNET_PeerIdentity));
1118 memcpy (&path[getl], data, size);
1119 add_pending_message (m->client, pm);
1122 GNUNET_free_non_null (cl);
1127 * Initialize client subsystem.
1129 * @param server the initialized server
1132 GDS_CLIENTS_init (struct GNUNET_SERVER_Handle *server)
1134 static struct GNUNET_SERVER_MessageHandler plugin_handlers[] = {
1135 {&handle_dht_local_put, NULL,
1136 GNUNET_MESSAGE_TYPE_DHT_CLIENT_PUT, 0},
1137 {&handle_dht_local_get, NULL,
1138 GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET, 0},
1139 {&handle_dht_local_get_stop, NULL,
1140 GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET_STOP,
1141 sizeof (struct GNUNET_DHT_ClientGetStopMessage)},
1142 {&handle_dht_local_monitor, NULL,
1143 GNUNET_MESSAGE_TYPE_DHT_MONITOR_GET,
1144 sizeof (struct GNUNET_DHT_MonitorMessage)},
1147 forward_map = GNUNET_CONTAINER_multihashmap_create (1024);
1148 retry_heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1149 GNUNET_SERVER_add_handlers (server, plugin_handlers);
1150 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
1155 * Shutdown client subsystem.
1160 GNUNET_assert (client_head == NULL);
1161 GNUNET_assert (client_tail == NULL);
1162 if (GNUNET_SCHEDULER_NO_TASK != retry_task)
1164 GNUNET_SCHEDULER_cancel (retry_task);
1165 retry_task = GNUNET_SCHEDULER_NO_TASK;
1167 if (NULL != retry_heap)
1169 GNUNET_assert (0 == GNUNET_CONTAINER_heap_get_size (retry_heap));
1170 GNUNET_CONTAINER_heap_destroy (retry_heap);
1173 if (NULL != forward_map)
1175 GNUNET_assert (0 == GNUNET_CONTAINER_multihashmap_size (forward_map));
1176 GNUNET_CONTAINER_multihashmap_destroy (forward_map);
1181 /* end of gnunet-service-dht_clients.c */