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.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
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-xdht.h"
33 #include "gnunet-service-xdht_clients.h"
34 #include "gnunet-service-xdht_datacache.h"
35 #include "gnunet-service-xdht_neighbours.h"
40 * Should routing details be logged to stderr (for debugging)?
42 #define LOG_TRAFFIC(kind,...) GNUNET_log_from (kind, "dht-traffic",__VA_ARGS__)
44 #define LOG(kind,...) GNUNET_log_from (kind, "dht-clients",__VA_ARGS__)
48 * Should this peer act malicious?
50 extern unsigned int malicious;
54 * Linked list of messages to send to clients.
59 * Pointer to next item in the list
61 struct PendingMessage *next;
64 * Pointer to previous item in the list
66 struct PendingMessage *prev;
69 * Actual message to be sent, allocated at the end of the struct:
70 * // msg = (cast) &pm[1];
71 * // memcpy (&pm[1], data, len);
73 const struct GNUNET_MessageHeader *msg;
79 * Struct containing information about a client,
80 * handle to connect to it, and any pending messages
81 * that need to be sent to it.
86 * Linked list of active clients
88 struct ClientList *next;
91 * Linked list of active clients
93 struct ClientList *prev;
96 * The handle to this client
98 struct GNUNET_SERVER_Client *client_handle;
101 * Handle to the current transmission request, NULL
104 struct GNUNET_SERVER_TransmitHandle *transmit_handle;
107 * Linked list of pending messages for this client
109 struct PendingMessage *pending_head;
112 * Tail of linked list of pending messages for this client
114 struct PendingMessage *pending_tail;
120 * Entry in the local forwarding map for a client's GET request.
122 struct ClientQueryRecord
126 * The key this request was about
128 struct GNUNET_HashCode key;
131 * Client responsible for the request.
133 struct ClientList *client;
136 * Extended query (see gnunet_block_lib.h), allocated at the end of this struct.
141 * Replies we have already seen for this request.
143 struct GNUNET_HashCode *seen_replies;
146 * Pointer to this nodes heap location in the retry-heap (for fast removal)
148 struct GNUNET_CONTAINER_HeapNode *hnode;
151 * What's the delay between re-try operations that we currently use for this
154 struct GNUNET_TIME_Relative retry_frequency;
157 * What's the next time we should re-try this request?
159 struct GNUNET_TIME_Absolute retry_time;
162 * The unique identifier of this request
167 * Number of bytes in xquery.
172 * Number of entries in 'seen_replies'.
174 unsigned int seen_replies_count;
177 * Desired replication level
179 uint32_t replication;
182 * Any message options for this request
184 uint32_t msg_options;
187 * The type for the data for the GET request.
189 enum GNUNET_BLOCK_Type type;
195 * Struct containing paremeters of monitoring requests.
197 struct ClientMonitorRecord
201 * Next element in DLL.
203 struct ClientMonitorRecord *next;
206 * Previous element in DLL.
208 struct ClientMonitorRecord *prev;
211 * Type of blocks that are of interest
213 enum GNUNET_BLOCK_Type type;
216 * Key of data of interest, NULL for all.
218 struct GNUNET_HashCode *key;
221 * Flag whether to notify about GET messages.
226 * Flag whether to notify about GET_REPONSE messages.
231 * Flag whether to notify about PUT messages.
236 * Client to notify of these requests.
238 struct ClientList *client;
243 * List of active clients.
245 static struct ClientList *client_head;
248 * List of active clients.
250 static struct ClientList *client_tail;
253 * List of active monitoring requests.
255 static struct ClientMonitorRecord *monitor_head;
258 * List of active monitoring requests.
260 static struct ClientMonitorRecord *monitor_tail;
263 * Hashmap for fast key based lookup, maps keys to `struct ClientQueryRecord` entries.
265 static struct GNUNET_CONTAINER_MultiHashMap *forward_map;
268 * Heap with all of our client's request, sorted by retry time (earliest on top).
270 static struct GNUNET_CONTAINER_Heap *retry_heap;
273 * Task that re-transmits requests (using retry_heap).
275 static GNUNET_SCHEDULER_TaskIdentifier retry_task;
279 * Task run to check for messages that need to be sent to a client.
281 * @param client a ClientList, containing the client and any messages to be sent to it
284 process_pending_messages (struct ClientList *client);
288 * Callback called as a result of issuing a GNUNET_SERVER_notify_transmit_ready
289 * request. A ClientList is passed as closure, take the head of the list
290 * and copy it into buf, which has the result of sending the message to the
293 * @param cls closure to this call
294 * @param size maximum number of bytes available to send
295 * @param buf where to copy the actual message to
297 * @return the number of bytes actually copied, 0 indicates failure
300 send_reply_to_client (void *cls, size_t size, void *buf)
302 struct ClientList *client = cls;
304 struct PendingMessage *reply;
308 client->transmit_handle = NULL;
311 /* client disconnected */
312 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
313 "Client %p disconnected, pending messages will be discarded\n",
314 client->client_handle);
318 while ((NULL != (reply = client->pending_head)) &&
319 (size >= off + (msize = ntohs (reply->msg->size))))
321 GNUNET_CONTAINER_DLL_remove (client->pending_head, client->pending_tail,
323 memcpy (&cbuf[off], reply->msg, msize);
325 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transmitting %u bytes to client %p\n",
326 msize, client->client_handle);
329 process_pending_messages (client);
330 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transmitted %u/%u bytes to client %p\n",
331 (unsigned int) off, (unsigned int) size, client->client_handle);
337 * Task run to check for messages that need to be sent to a client.
339 * @param client a ClientList, containing the client and any messages to be sent to it
342 process_pending_messages (struct ClientList *client)
344 if ((client->pending_head == NULL) || (client->transmit_handle != NULL))
346 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
347 "Not asking for transmission to %p now: %s\n",
348 client->client_handle,
349 client->pending_head ==
350 NULL ? "no more messages" : "request already pending");
353 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
354 "Asking for transmission of %u bytes to client %p\n",
355 ntohs (client->pending_head->msg->size), client->client_handle);
356 client->transmit_handle =
357 GNUNET_SERVER_notify_transmit_ready (client->client_handle,
358 ntohs (client->pending_head->
360 GNUNET_TIME_UNIT_FOREVER_REL,
361 &send_reply_to_client, client);
366 * Add a PendingMessage to the clients list of messages to be sent
368 * @param client the active client to send the message to
369 * @param pending_message the actual message to send
372 add_pending_message (struct ClientList *client,
373 struct PendingMessage *pending_message)
375 GNUNET_CONTAINER_DLL_insert_tail (client->pending_head, client->pending_tail,
377 process_pending_messages (client);
382 * Closure for 'forward_reply'
384 struct ForwardReplyContext
388 * Actual message to send to matching clients.
390 struct PendingMessage *pm;
400 enum GNUNET_BLOCK_Type type;
403 * Number of bytes in data.
408 * Do we need to copy 'pm' because it was already used?
416 * Find a client if it exists, add it otherwise.
418 * @param client the server handle to the client
420 * @return the client if found, a new client otherwise
422 static struct ClientList *
423 find_active_client (struct GNUNET_SERVER_Client *client)
425 struct ClientList *pos = client_head;
426 struct ClientList *ret;
430 if (pos->client_handle == client)
434 ret = GNUNET_new (struct ClientList);
435 ret->client_handle = client;
436 GNUNET_CONTAINER_DLL_insert (client_head, client_tail, ret);
442 * Iterator over hash map entries that frees all entries
443 * associated with the given client.
445 * @param cls client to search for in source routes
446 * @param key current key code (ignored)
447 * @param value value in the hash map, a ClientQueryRecord
448 * @return #GNUNET_YES (we should continue to iterate)
451 remove_client_records (void *cls, const struct GNUNET_HashCode * key, void *value)
453 struct ClientList *client = cls;
454 struct ClientQueryRecord *record = value;
456 if (record->client != client)
458 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
459 "Removing client %p's record for key %s\n", client,
461 GNUNET_assert (GNUNET_YES ==
462 GNUNET_CONTAINER_multihashmap_remove (forward_map, key,
464 if (NULL != record->hnode)
465 GNUNET_CONTAINER_heap_remove_node (record->hnode);
466 GNUNET_array_grow (record->seen_replies, record->seen_replies_count, 0);
467 GNUNET_free (record);
473 * Iterator over hash map entries that send a given reply to
474 * each of the matching clients. With some tricky recycling
477 * @param cls the 'struct ForwardReplyContext'
478 * @param key current key
479 * @param value value in the hash map, a ClientQueryRecord
480 * @return GNUNET_YES (we should continue to iterate),
481 * if the result is mal-formed, GNUNET_NO
484 forward_reply (void *cls, const struct GNUNET_HashCode * key, void *value)
486 struct ForwardReplyContext *frc = cls;
487 struct ClientQueryRecord *record = value;
488 struct PendingMessage *pm;
489 struct GNUNET_DHT_ClientResultMessage *reply;
490 enum GNUNET_BLOCK_EvaluationResult eval;
492 struct GNUNET_HashCode ch;
495 LOG_TRAFFIC (GNUNET_ERROR_TYPE_DEBUG,
496 "XVINE CLIENT-RESULT %s\n",
497 GNUNET_h2s_full (key));
499 if ((record->type != GNUNET_BLOCK_TYPE_ANY) && (record->type != frc->type))
501 LOG (GNUNET_ERROR_TYPE_DEBUG,
502 "Record type missmatch, not passing request for key %s to local client\n",
505 GNUNET_STATISTICS_update (GDS_stats,
507 ("# Key match, type mismatches in REPLY to CLIENT"),
509 return GNUNET_YES; /* type mismatch */
512 GNUNET_CRYPTO_hash (frc->data, frc->data_size, &ch);
513 for (i = 0; i < record->seen_replies_count; i++)
514 if (0 == memcmp (&record->seen_replies[i], &ch, sizeof (struct GNUNET_HashCode)))
516 LOG (GNUNET_ERROR_TYPE_DEBUG,
517 "Duplicate reply, not passing request for key %s to local client\n",
519 GNUNET_STATISTICS_update (GDS_stats,
521 ("# Duplicate REPLIES to CLIENT request dropped"),
523 return GNUNET_YES; /* duplicate */
526 GNUNET_BLOCK_evaluate (GDS_block_context, record->type, key, NULL, 0,
527 record->xquery, record->xquery_size, frc->data,
529 LOG (GNUNET_ERROR_TYPE_DEBUG,
530 "Evaluation result is %d for key %s for local client's query\n",
531 (int) eval, GNUNET_h2s (key));
534 case GNUNET_BLOCK_EVALUATION_OK_LAST:
535 do_free = GNUNET_YES;
537 case GNUNET_BLOCK_EVALUATION_OK_MORE:
538 GNUNET_array_append (record->seen_replies, record->seen_replies_count, ch);
541 case GNUNET_BLOCK_EVALUATION_OK_DUPLICATE:
542 /* should be impossible to encounter here */
545 case GNUNET_BLOCK_EVALUATION_RESULT_INVALID:
548 case GNUNET_BLOCK_EVALUATION_REQUEST_VALID:
551 case GNUNET_BLOCK_EVALUATION_REQUEST_INVALID:
554 case GNUNET_BLOCK_EVALUATION_RESULT_IRRELEVANT:
556 case GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED:
557 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
558 _("Unsupported block type (%u) in request!\n"), record->type);
564 if (GNUNET_NO == frc->do_copy)
566 /* first time, we can use the original data */
568 frc->do_copy = GNUNET_YES;
572 /* two clients waiting for same reply, must copy for queueing */
573 pm = GNUNET_malloc (sizeof (struct PendingMessage) +
574 ntohs (frc->pm->msg->size));
576 sizeof (struct PendingMessage) + ntohs (frc->pm->msg->size));
577 pm->next = pm->prev = NULL;
578 pm->msg = (struct GNUNET_MessageHeader *) &pm[1];
580 GNUNET_STATISTICS_update (GDS_stats,
581 gettext_noop ("# RESULTS queued for clients"), 1,
583 reply = (struct GNUNET_DHT_ClientResultMessage *) &pm[1];
584 reply->unique_id = record->unique_id;
585 LOG (GNUNET_ERROR_TYPE_DEBUG,
586 "Queueing reply to query %s for client %p\n",
588 record->client->client_handle);
589 add_pending_message (record->client, pm);
590 if (GNUNET_YES == do_free)
591 remove_client_records (record->client, key, record);
597 * Handle a reply we've received from another peer. If the reply
598 * matches any of our pending queries, forward it to the respective
601 * @param expiration when will the reply expire
602 * @param key the query this reply is for
603 * @param get_path_length number of peers in @a get_path
604 * @param get_path path the reply took on get
605 * @param put_path_length number of peers in @a put_path
606 * @param put_path path the reply took on put
607 * @param type type of the reply
608 * @param data_size number of bytes in @a data
609 * @param data application payload data
612 GDS_CLIENTS_handle_reply (struct GNUNET_TIME_Absolute expiration,
613 const struct GNUNET_HashCode *key,
614 unsigned int get_path_length,
615 const struct GNUNET_PeerIdentity *get_path,
616 unsigned int put_path_length,
617 const struct GNUNET_PeerIdentity *put_path,
618 enum GNUNET_BLOCK_Type type, size_t data_size,
621 struct ForwardReplyContext frc;
622 struct PendingMessage *pm;
623 struct GNUNET_DHT_ClientResultMessage *reply;
624 struct GNUNET_PeerIdentity *paths;
627 LOG (GNUNET_ERROR_TYPE_DEBUG,
628 "reply for key %s\n",
631 if (NULL == GNUNET_CONTAINER_multihashmap_get (forward_map, key))
633 GNUNET_STATISTICS_update (GDS_stats,
635 ("# REPLIES ignored for CLIENTS (no match)"), 1,
637 return; /* no matching request, fast exit! */
640 sizeof (struct GNUNET_DHT_ClientResultMessage) + data_size +
641 (get_path_length + put_path_length) * sizeof (struct GNUNET_PeerIdentity);
642 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
644 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
645 _("Could not pass reply to client, message too big!\n"));
648 pm = GNUNET_malloc (msize + sizeof (struct PendingMessage));
649 reply = (struct GNUNET_DHT_ClientResultMessage *) &pm[1];
650 pm->msg = &reply->header;
651 reply->header.size = htons ((uint16_t) msize);
652 reply->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_CLIENT_RESULT);
653 reply->type = htonl (type);
654 reply->get_path_length = htonl (get_path_length);
655 reply->put_path_length = htonl (put_path_length);
656 reply->unique_id = 0; /* filled in later */
657 reply->expiration = GNUNET_TIME_absolute_hton (expiration);
659 paths = (struct GNUNET_PeerIdentity *) &reply[1];
660 memcpy (paths, put_path,
661 sizeof (struct GNUNET_PeerIdentity) * put_path_length);
662 memcpy (&paths[put_path_length], get_path,
663 sizeof (struct GNUNET_PeerIdentity) * get_path_length);
664 memcpy (&paths[get_path_length + put_path_length], data, data_size);
665 frc.do_copy = GNUNET_NO;
668 frc.data_size = data_size;
670 GNUNET_CONTAINER_multihashmap_get_multiple (forward_map, key, &forward_reply,
672 if (GNUNET_NO == frc.do_copy)
674 /* did not match any of the requests, free! */
675 GNUNET_STATISTICS_update (GDS_stats,
677 ("# REPLIES ignored for CLIENTS (no match)"), 1,
684 * Check if some client is monitoring GET messages and notify
687 * @param options Options, for instance RecordRoute, DemultiplexEverywhere.
688 * @param type The type of data in the request.
689 * @param hop_count Hop count so far.
690 * @param path_length number of entries in path (or 0 if not recorded).
691 * @param path peers on the GET path (or NULL if not recorded).
692 * @param desired_replication_level Desired replication level.
693 * @param key Key of the requested data.
696 GDS_CLIENTS_process_get (uint32_t options,
697 enum GNUNET_BLOCK_Type type,
699 uint32_t desired_replication_level,
700 unsigned int path_length,
701 const struct GNUNET_PeerIdentity *path,
702 const struct GNUNET_HashCode * key)
704 struct ClientMonitorRecord *m;
705 struct ClientList **cl;
706 unsigned int cl_size;
710 for (m = monitor_head; NULL != m; m = m->next)
712 if ((GNUNET_BLOCK_TYPE_ANY == m->type || m->type == type) &&
714 memcmp (key, m->key, sizeof(struct GNUNET_HashCode)) == 0))
716 struct PendingMessage *pm;
717 struct GNUNET_DHT_MonitorGetMessage *mmsg;
718 struct GNUNET_PeerIdentity *msg_path;
722 /* Don't send duplicates */
723 for (i = 0; i < cl_size; i++)
724 if (cl[i] == m->client)
728 GNUNET_array_append (cl, cl_size, m->client);
730 msize = path_length * sizeof (struct GNUNET_PeerIdentity);
731 msize += sizeof (struct GNUNET_DHT_MonitorGetMessage);
732 msize += sizeof (struct PendingMessage);
733 pm = GNUNET_malloc (msize);
734 mmsg = (struct GNUNET_DHT_MonitorGetMessage *) &pm[1];
735 pm->msg = &mmsg->header;
736 mmsg->header.size = htons (msize - sizeof (struct PendingMessage));
737 mmsg->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_MONITOR_GET);
738 mmsg->options = htonl(options);
739 mmsg->type = htonl(type);
740 mmsg->hop_count = htonl(hop_count);
741 mmsg->desired_replication_level = htonl(desired_replication_level);
742 mmsg->get_path_length = htonl(path_length);
743 memcpy (&mmsg->key, key, sizeof (struct GNUNET_HashCode));
744 msg_path = (struct GNUNET_PeerIdentity *) &mmsg[1];
746 memcpy (msg_path, path,
747 path_length * sizeof (struct GNUNET_PeerIdentity));
748 add_pending_message (m->client, pm);
751 GNUNET_free_non_null (cl);
756 * Check if some client is monitoring PUT messages and notify
759 * @param options Options, for instance RecordRoute, DemultiplexEverywhere.
760 * @param type The type of data in the request.
761 * @param hop_count Hop count so far.
762 * @param path_length number of entries in path (or 0 if not recorded).
763 * @param path peers on the PUT path (or NULL if not recorded).
764 * @param desired_replication_level Desired replication level.
765 * @param exp Expiration time of the data.
766 * @param key Key under which data is to be stored.
767 * @param data Pointer to the data carried.
768 * @param size Number of bytes in data.
771 GDS_CLIENTS_process_put (uint32_t options,
772 enum GNUNET_BLOCK_Type type,
774 uint32_t desired_replication_level,
775 unsigned int path_length,
776 const struct GNUNET_PeerIdentity *path,
777 struct GNUNET_TIME_Absolute exp,
778 const struct GNUNET_HashCode * key,
782 struct ClientMonitorRecord *m;
783 struct ClientList **cl;
784 unsigned int cl_size;
788 for (m = monitor_head; NULL != m; m = m->next)
790 if ((GNUNET_BLOCK_TYPE_ANY == m->type || m->type == type) &&
792 memcmp (key, m->key, sizeof(struct GNUNET_HashCode)) == 0))
794 struct PendingMessage *pm;
795 struct GNUNET_DHT_MonitorPutMessage *mmsg;
796 struct GNUNET_PeerIdentity *msg_path;
800 /* Don't send duplicates */
801 for (i = 0; i < cl_size; i++)
802 if (cl[i] == m->client)
806 GNUNET_array_append (cl, cl_size, m->client);
809 msize += path_length * sizeof (struct GNUNET_PeerIdentity);
810 msize += sizeof (struct GNUNET_DHT_MonitorPutMessage);
811 msize += sizeof (struct PendingMessage);
812 pm = GNUNET_malloc (msize);
813 mmsg = (struct GNUNET_DHT_MonitorPutMessage *) &pm[1];
814 pm->msg = (struct GNUNET_MessageHeader *) mmsg;
815 mmsg->header.size = htons (msize - sizeof (struct PendingMessage));
816 mmsg->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_MONITOR_PUT);
817 mmsg->options = htonl(options);
818 mmsg->type = htonl(type);
819 mmsg->hop_count = htonl(hop_count);
820 mmsg->desired_replication_level = htonl(desired_replication_level);
821 mmsg->put_path_length = htonl(path_length);
822 msg_path = (struct GNUNET_PeerIdentity *) &mmsg[1];
825 memcpy (msg_path, path,
826 path_length * sizeof (struct GNUNET_PeerIdentity));
828 mmsg->expiration_time = GNUNET_TIME_absolute_hton(exp);
829 memcpy (&mmsg->key, key, sizeof (struct GNUNET_HashCode));
831 memcpy (&msg_path[path_length], data, size);
832 add_pending_message (m->client, pm);
835 GNUNET_free_non_null (cl);
840 * Route the given request via the DHT.
843 transmit_request (struct ClientQueryRecord *cqr)
845 GNUNET_STATISTICS_update (GDS_stats,
847 ("# GET requests from clients injected"), 1,
850 LOG (GNUNET_ERROR_TYPE_DEBUG,
851 "Initiating GET for %s, replication %u, already have %u replies\n",
852 GNUNET_h2s (&cqr->key),
854 cqr->seen_replies_count);
855 struct GNUNET_PeerIdentity best_known_dest;
856 struct GNUNET_HashCode intermediate_trail_id;
858 memset (&best_known_dest, 0, sizeof (struct GNUNET_PeerIdentity));
859 memset (&intermediate_trail_id, 0, sizeof (struct GNUNET_HashCode));
861 GDS_NEIGHBOURS_send_get (&cqr->key, cqr->type, cqr->msg_options,
862 cqr->replication, best_known_dest,
863 intermediate_trail_id , NULL,
866 GDS_NEIGHBOURS_send_get (&cqr->key, cqr->type, cqr->msg_options,
867 cqr->replication, NULL, NULL , NULL,
870 /* exponential back-off for retries.
871 * max GNUNET_TIME_STD_EXPONENTIAL_BACKOFF_THRESHOLD (15 min) */
872 cqr->retry_frequency = GNUNET_TIME_STD_BACKOFF (cqr->retry_frequency);
873 cqr->retry_time = GNUNET_TIME_relative_to_absolute (cqr->retry_frequency);
878 * Task that looks at the 'retry_heap' and transmits all of the requests
879 * on the heap that are ready for transmission. Then re-schedules
880 * itself (unless the heap is empty).
883 * @param tc scheduler context
886 transmit_next_request_task (void *cls,
887 const struct GNUNET_SCHEDULER_TaskContext *tc)
889 struct ClientQueryRecord *cqr;
890 struct GNUNET_TIME_Relative delay;
892 retry_task = GNUNET_SCHEDULER_NO_TASK;
893 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
895 while (NULL != (cqr = GNUNET_CONTAINER_heap_remove_root (retry_heap)))
898 delay = GNUNET_TIME_absolute_get_remaining (cqr->retry_time);
899 if (delay.rel_value_us > 0)
902 GNUNET_CONTAINER_heap_insert (retry_heap, cqr,
903 cqr->retry_time.abs_value_us);
905 GNUNET_SCHEDULER_add_delayed (delay, &transmit_next_request_task,
909 transmit_request (cqr);
911 GNUNET_CONTAINER_heap_insert (retry_heap, cqr,
912 cqr->retry_time.abs_value_us);
918 * Handler for PUT messages.
920 * @param cls closure for the service
921 * @param client the client we received this message from
922 * @param message the actual message received
925 handle_dht_local_put (void *cls, struct GNUNET_SERVER_Client *client,
926 const struct GNUNET_MessageHeader *message)
928 const struct GNUNET_DHT_ClientPutMessage *put_msg;
929 struct PendingMessage *pm;
930 struct GNUNET_DHT_ClientPutConfirmationMessage *conf;
933 size = ntohs (message->size);
934 if (size < sizeof (struct GNUNET_DHT_ClientPutMessage))
937 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
940 GNUNET_STATISTICS_update (GDS_stats,
942 ("# PUT requests received from clients"), 1,
944 put_msg = (const struct GNUNET_DHT_ClientPutMessage *) message;
945 LOG_TRAFFIC (GNUNET_ERROR_TYPE_DEBUG, "X-VINE DHT CLIENT-PUT %s\n",
946 GNUNET_h2s_full (&put_msg->key));
947 /* give to local clients */
948 LOG (GNUNET_ERROR_TYPE_DEBUG,
949 "Handling local PUT of %u-bytes for query %s\n",
950 size - sizeof (struct GNUNET_DHT_ClientPutMessage),
951 GNUNET_h2s (&put_msg->key));
953 GDS_CLIENTS_handle_reply (GNUNET_TIME_absolute_ntoh (put_msg->expiration),
954 &put_msg->key, 0, NULL, 0, NULL,
955 ntohl (put_msg->type),
956 size - sizeof (struct GNUNET_DHT_ClientPutMessage),
958 /* FIXME: Should we store locally? */
959 /* GDS_DATACACHE_handle_put (GNUNET_TIME_absolute_ntoh (put_msg->expiration),
960 &put_msg->key, 0, NULL, ntohl (put_msg->type),
961 size - sizeof (struct GNUNET_DHT_ClientPutMessage),
964 struct GNUNET_PeerIdentity my_identity = GDS_NEIGHBOURS_get_my_id();
965 struct GNUNET_PeerIdentity best_known_destination;
966 struct GNUNET_HashCode intermediate_trail_id;
968 memset(&best_known_destination, 0 , sizeof (struct GNUNET_PeerIdentity));
969 memset(&intermediate_trail_id, 0, sizeof (struct GNUNET_HashCode));
971 GDS_NEIGHBOURS_send_put (&put_msg->key,
972 ntohl (put_msg->type), ntohl (put_msg->options),
973 ntohl (put_msg->desired_replication_level),
974 best_known_destination,
975 intermediate_trail_id, NULL, 0, 0, NULL,
976 GNUNET_TIME_absolute_ntoh (put_msg->expiration),
978 size - sizeof (struct GNUNET_DHT_ClientPutMessage));
980 GDS_NEIGHBOURS_send_put (&put_msg->key,
981 ntohl (put_msg->type), ntohl (put_msg->options),
982 ntohl (put_msg->desired_replication_level), NULL,
983 NULL, NULL, 0, 0, NULL,
984 GNUNET_TIME_absolute_ntoh (put_msg->expiration),
986 size - sizeof (struct GNUNET_DHT_ClientPutMessage));
989 GDS_CLIENTS_process_put (ntohl (put_msg->options),
990 ntohl (put_msg->type),
992 ntohl (put_msg->desired_replication_level),
995 GNUNET_TIME_absolute_ntoh (put_msg->expiration),
998 size - sizeof (struct GNUNET_DHT_ClientPutMessage));
1000 pm = GNUNET_malloc (sizeof (struct PendingMessage) +
1001 sizeof (struct GNUNET_DHT_ClientPutConfirmationMessage));
1002 conf = (struct GNUNET_DHT_ClientPutConfirmationMessage *) &pm[1];
1003 conf->header.size = htons (sizeof (struct GNUNET_DHT_ClientPutConfirmationMessage));
1004 conf->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_CLIENT_PUT_OK);
1005 conf->reserved = htonl (0);
1006 conf->unique_id = put_msg->unique_id;
1007 pm->msg = &conf->header;
1008 add_pending_message (find_active_client (client), pm);
1009 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1014 * Handler for DHT GET messages from the client.
1016 * @param cls closure for the service
1017 * @param client the client we received this message from
1018 * @param message the actual message received
1021 handle_dht_local_get (void *cls, struct GNUNET_SERVER_Client *client,
1022 const struct GNUNET_MessageHeader *message)
1024 const struct GNUNET_DHT_ClientGetMessage *get;
1025 struct ClientQueryRecord *cqr;
1030 size = ntohs (message->size);
1031 if (size < sizeof (struct GNUNET_DHT_ClientGetMessage))
1034 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1037 xquery_size = size - sizeof (struct GNUNET_DHT_ClientGetMessage);
1038 get = (const struct GNUNET_DHT_ClientGetMessage *) message;
1039 xquery = (const char *) &get[1];
1040 GNUNET_STATISTICS_update (GDS_stats,
1042 ("# GET requests received from clients"), 1,
1044 LOG (GNUNET_ERROR_TYPE_DEBUG,
1045 "Received GET request for %s from local client %p, xq: %.*s\n",
1046 GNUNET_h2s (&get->key), client, xquery_size, xquery);
1048 LOG_TRAFFIC (GNUNET_ERROR_TYPE_DEBUG, "X-VINE CLIENT-GET %s\n",
1049 GNUNET_h2s_full (&get->key));
1052 cqr = GNUNET_malloc (sizeof (struct ClientQueryRecord) + xquery_size);
1053 cqr->key = get->key;
1054 cqr->client = find_active_client (client);
1055 cqr->xquery = (void *) &cqr[1];
1056 memcpy (&cqr[1], xquery, xquery_size);
1057 cqr->hnode = GNUNET_CONTAINER_heap_insert (retry_heap, cqr, 0);
1058 cqr->retry_frequency = GNUNET_TIME_UNIT_SECONDS;
1059 cqr->retry_time = GNUNET_TIME_absolute_get ();
1060 cqr->unique_id = get->unique_id;
1061 cqr->xquery_size = xquery_size;
1062 cqr->replication = ntohl (get->desired_replication_level);
1063 cqr->msg_options = ntohl (get->options);
1064 cqr->type = ntohl (get->type);
1066 // FIXME use cqr->key, set multihashmap create to GNUNET_YES
1067 GNUNET_CONTAINER_multihashmap_put (forward_map, &get->key, cqr,
1068 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
1070 struct GNUNET_PeerIdentity my_identity;
1071 my_identity = GDS_NEIGHBOURS_get_my_id();
1072 GDS_CLIENTS_process_get (ntohl (get->options),
1075 ntohl (get->desired_replication_level),
1079 /* start remote requests */
1080 if (GNUNET_SCHEDULER_NO_TASK != retry_task)
1081 GNUNET_SCHEDULER_cancel (retry_task);
1082 retry_task = GNUNET_SCHEDULER_add_now (&transmit_next_request_task, NULL);
1083 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1088 * Closure for 'find_by_unique_id'.
1090 struct FindByUniqueIdContext
1093 * Where to store the result, if found.
1095 struct ClientQueryRecord *cqr;
1102 * Function called for each existing DHT record for the given
1103 * query. Checks if it matches the UID given in the closure
1104 * and if so returns the entry as a result.
1106 * @param cls the search context
1107 * @param key query for the lookup (not used)
1108 * @param value the 'struct ClientQueryRecord'
1109 * @return GNUNET_YES to continue iteration (result not yet found)
1112 find_by_unique_id (void *cls,
1113 const struct GNUNET_HashCode *key,
1116 struct FindByUniqueIdContext *fui_ctx = cls;
1117 struct ClientQueryRecord *cqr = value;
1119 if (cqr->unique_id != fui_ctx->unique_id)
1127 * Handler for "GET result seen" messages from the client.
1129 * @param cls closure for the service
1130 * @param client the client we received this message from
1131 * @param message the actual message received
1134 handle_dht_local_get_result_seen (void *cls, struct GNUNET_SERVER_Client *client,
1135 const struct GNUNET_MessageHeader *message)
1137 const struct GNUNET_DHT_ClientGetResultSeenMessage *seen;
1139 unsigned int hash_count;
1140 unsigned int old_count;
1141 const struct GNUNET_HashCode *hc;
1142 struct FindByUniqueIdContext fui_ctx;
1143 struct ClientQueryRecord *cqr;
1145 size = ntohs (message->size);
1146 if (size < sizeof (struct GNUNET_DHT_ClientGetResultSeenMessage))
1149 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1152 seen = (const struct GNUNET_DHT_ClientGetResultSeenMessage *) message;
1153 hash_count = (size - sizeof (struct GNUNET_DHT_ClientGetResultSeenMessage)) / sizeof (struct GNUNET_HashCode);
1154 if (size != sizeof (struct GNUNET_DHT_ClientGetResultSeenMessage) + hash_count * sizeof (struct GNUNET_HashCode))
1157 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1160 hc = (const struct GNUNET_HashCode*) &seen[1];
1161 fui_ctx.unique_id = seen->unique_id;
1163 GNUNET_CONTAINER_multihashmap_get_multiple (forward_map,
1167 if (NULL == (cqr = fui_ctx.cqr))
1170 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1173 /* finally, update 'seen' list */
1174 old_count = cqr->seen_replies_count;
1175 GNUNET_array_grow (cqr->seen_replies,
1176 cqr->seen_replies_count,
1177 cqr->seen_replies_count + hash_count);
1178 memcpy (&cqr->seen_replies[old_count],
1180 sizeof (struct GNUNET_HashCode) * hash_count);
1185 * Closure for 'remove_by_unique_id'.
1187 struct RemoveByUniqueIdContext
1190 * Client that issued the removal request.
1192 struct ClientList *client;
1195 * Unique ID of the request.
1202 * Iterator over hash map entries that frees all entries
1203 * that match the given client and unique ID.
1205 * @param cls unique ID and client to search for in source routes
1206 * @param key current key code
1207 * @param value value in the hash map, a ClientQueryRecord
1208 * @return GNUNET_YES (we should continue to iterate)
1211 remove_by_unique_id (void *cls, const struct GNUNET_HashCode * key, void *value)
1213 const struct RemoveByUniqueIdContext *ctx = cls;
1214 struct ClientQueryRecord *record = value;
1216 if (record->unique_id != ctx->unique_id)
1218 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1219 "Removing client %p's record for key %s (by unique id)\n",
1220 ctx->client->client_handle, GNUNET_h2s (key));
1221 return remove_client_records (ctx->client, key, record);
1226 * Handler for any generic DHT stop messages, calls the appropriate handler
1227 * depending on message type (if processed locally)
1229 * @param cls closure for the service
1230 * @param client the client we received this message from
1231 * @param message the actual message received
1235 handle_dht_local_get_stop (void *cls, struct GNUNET_SERVER_Client *client,
1236 const struct GNUNET_MessageHeader *message)
1238 const struct GNUNET_DHT_ClientGetStopMessage *dht_stop_msg =
1239 (const struct GNUNET_DHT_ClientGetStopMessage *) message;
1240 struct RemoveByUniqueIdContext ctx;
1242 GNUNET_STATISTICS_update (GDS_stats,
1244 ("# GET STOP requests received from clients"), 1,
1246 LOG (GNUNET_ERROR_TYPE_DEBUG,
1247 "Received GET STOP request for %s from local client %p\n",
1248 client, GNUNET_h2s (&dht_stop_msg->key));
1249 ctx.client = find_active_client (client);
1250 ctx.unique_id = dht_stop_msg->unique_id;
1251 GNUNET_CONTAINER_multihashmap_get_multiple (forward_map, &dht_stop_msg->key,
1252 &remove_by_unique_id, &ctx);
1253 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1258 * Handler for monitor start messages
1260 * @param cls closure for the service
1261 * @param client the client we received this message from
1262 * @param message the actual message received
1266 handle_dht_local_monitor (void *cls, struct GNUNET_SERVER_Client *client,
1267 const struct GNUNET_MessageHeader *message)
1269 struct ClientMonitorRecord *r;
1270 const struct GNUNET_DHT_MonitorStartStopMessage *msg;
1272 msg = (struct GNUNET_DHT_MonitorStartStopMessage *) message;
1273 r = GNUNET_new (struct ClientMonitorRecord);
1275 r->client = find_active_client(client);
1276 r->type = ntohl(msg->type);
1277 r->get = ntohs(msg->get);
1278 r->get_resp = ntohs(msg->get_resp);
1279 r->put = ntohs(msg->put);
1280 if (0 == ntohs(msg->filter_key))
1284 r->key = GNUNET_new (struct GNUNET_HashCode);
1285 memcpy (r->key, &msg->key, sizeof (struct GNUNET_HashCode));
1287 GNUNET_CONTAINER_DLL_insert (monitor_head, monitor_tail, r);
1288 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1293 * Handler for monitor stop messages
1295 * @param cls closure for the service
1296 * @param client the client we received this message from
1297 * @param message the actual message received
1301 handle_dht_local_monitor_stop (void *cls, struct GNUNET_SERVER_Client *client,
1302 const struct GNUNET_MessageHeader *message)
1304 struct ClientMonitorRecord *r;
1305 const struct GNUNET_DHT_MonitorStartStopMessage *msg;
1308 msg = (struct GNUNET_DHT_MonitorStartStopMessage *) message;
1314 keys_match = (0 == ntohs(msg->filter_key));
1317 keys_match = (0 != ntohs(msg->filter_key)
1318 && !memcmp(r->key, &msg->key, sizeof(struct GNUNET_HashCode)));
1320 if (find_active_client(client) == r->client
1321 && ntohl(msg->type) == r->type
1322 && r->get == msg->get
1323 && r->get_resp == msg->get_resp
1324 && r->put == msg->put
1328 GNUNET_CONTAINER_DLL_remove (monitor_head, monitor_tail, r);
1329 GNUNET_free_non_null (r->key);
1331 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1332 return; /* Delete only ONE entry */
1337 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1341 #if ENABLE_MALICIOUS
1343 * Handler for act malicous message.
1345 * @param cls closure for the service
1346 * @param client the client we received this message from
1347 * @param message the actual message received
1351 handle_dht_act_malicious (void *cls, struct GNUNET_SERVER_Client *client,
1352 const struct GNUNET_MessageHeader *message)
1354 /* FIXME: parse message and set malicious */
1355 const struct GNUNET_DHT_ActMaliciousMessage *msg;
1356 unsigned int malicious;
1358 msg = (const struct GNUNET_DHT_ActMaliciousMessage *)message;
1359 malicious = msg->action;
1360 GDS_NEIGHBOURS_act_malicious(malicious);
1366 * Functions with this signature are called whenever a client
1367 * is disconnected on the network level.
1369 * @param cls closure (NULL for dht)
1370 * @param client identification of the client; NULL
1371 * for the last call when the server is destroyed
1374 handle_client_disconnect (void *cls,
1375 struct GNUNET_SERVER_Client *client)
1377 struct ClientList *pos;
1378 struct PendingMessage *reply;
1379 struct ClientMonitorRecord *monitor;
1381 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1382 "Local client %p disconnects\n",
1384 pos = find_active_client (client);
1385 GNUNET_CONTAINER_DLL_remove (client_head, client_tail, pos);
1386 if (pos->transmit_handle != NULL)
1387 GNUNET_SERVER_notify_transmit_ready_cancel (pos->transmit_handle);
1388 while (NULL != (reply = pos->pending_head))
1390 GNUNET_CONTAINER_DLL_remove (pos->pending_head, pos->pending_tail, reply);
1391 GNUNET_free (reply);
1393 monitor = monitor_head;
1394 while (NULL != monitor)
1396 if (monitor->client == pos)
1398 struct ClientMonitorRecord *next;
1400 GNUNET_free_non_null (monitor->key);
1401 next = monitor->next;
1402 GNUNET_CONTAINER_DLL_remove (monitor_head, monitor_tail, monitor);
1403 GNUNET_free (monitor);
1407 monitor = monitor->next;
1409 GNUNET_CONTAINER_multihashmap_iterate (forward_map, &remove_client_records,
1417 * Initialize client subsystem.
1419 * @param server the initialized server
1422 GDS_CLIENTS_init (struct GNUNET_SERVER_Handle *server)
1424 static struct GNUNET_SERVER_MessageHandler plugin_handlers[] = {
1425 {&handle_dht_local_put, NULL,
1426 GNUNET_MESSAGE_TYPE_DHT_CLIENT_PUT, 0},
1427 {&handle_dht_local_get, NULL,
1428 GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET, 0},
1429 {&handle_dht_local_get_stop, NULL,
1430 GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET_STOP,
1431 sizeof (struct GNUNET_DHT_ClientGetStopMessage)},
1432 {&handle_dht_local_monitor, NULL,
1433 GNUNET_MESSAGE_TYPE_DHT_MONITOR_START,
1434 sizeof (struct GNUNET_DHT_MonitorStartStopMessage)},
1435 {&handle_dht_local_monitor_stop, NULL,
1436 GNUNET_MESSAGE_TYPE_DHT_MONITOR_STOP,
1437 sizeof (struct GNUNET_DHT_MonitorStartStopMessage)},
1438 {&handle_dht_local_get_result_seen, NULL,
1439 GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET_RESULTS_KNOWN, 0},
1440 #if ENABLE_MALICIOUS
1441 {&handle_dht_act_malicious, NULL,
1442 GNUNET_MESSAGE_TYPE_DHT_ACT_MALICIOUS,
1443 sizeof (struct GNUNET_DHT_ActMaliciousMessage)},
1447 forward_map = GNUNET_CONTAINER_multihashmap_create (1024, GNUNET_NO);
1448 retry_heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1449 GNUNET_SERVER_add_handlers (server, plugin_handlers);
1450 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
1455 * Shutdown client subsystem.
1460 GNUNET_assert (client_head == NULL);
1461 GNUNET_assert (client_tail == NULL);
1462 if (GNUNET_SCHEDULER_NO_TASK != retry_task)
1464 GNUNET_SCHEDULER_cancel (retry_task);
1465 retry_task = GNUNET_SCHEDULER_NO_TASK;
1467 if (NULL != retry_heap)
1469 GNUNET_assert (0 == GNUNET_CONTAINER_heap_get_size (retry_heap));
1470 GNUNET_CONTAINER_heap_destroy (retry_heap);
1473 if (NULL != forward_map)
1475 GNUNET_assert (0 == GNUNET_CONTAINER_multihashmap_size (forward_map));
1476 GNUNET_CONTAINER_multihashmap_destroy (forward_map);
1481 /* end of gnunet-service-dht_clients.c */