2 This file is part of GNUnet.
3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
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22 * @file fs/gnunet-service-fs.c
23 * @brief gnunet anonymity protocol implementation
24 * @author Christian Grothoff
27 * - TTL/priority calculations are absent!
29 * - have non-zero preference / priority for requests we initiate!
30 * - implement hot-path routing decision procedure
31 * - implement: bound_priority, test_load_too_high
36 #include "gnunet_constants.h"
37 #include "gnunet_core_service.h"
38 #include "gnunet_datastore_service.h"
39 #include "gnunet_peer_lib.h"
40 #include "gnunet_protocols.h"
41 #include "gnunet_signatures.h"
42 #include "gnunet_statistics_service.h"
43 #include "gnunet_util_lib.h"
44 #include "gnunet-service-fs_indexing.h"
47 #define DEBUG_FS GNUNET_NO
50 * Maximum number of outgoing messages we queue per peer.
51 * FIXME: make configurable?
53 #define MAX_QUEUE_PER_PEER 16
56 * Inverse of the probability that we will submit the same query
57 * to the same peer again. If the same peer already got the query
58 * repeatedly recently, the probability is multiplied by the inverse
59 * of this number each time. Note that we only try about every TTL_DECREMENT/2
60 * plus MAX_CORK_DELAY (so roughly every 3.5s).
62 #define RETRY_PROBABILITY_INV 3
65 * What is the maximum delay for a P2P FS message (in our interaction
66 * with core)? FS-internal delays are another story. The value is
67 * chosen based on the 32k block size. Given that peers typcially
68 * have at least 1 kb/s bandwidth, 45s waits give us a chance to
69 * transmit one message even to the lowest-bandwidth peers.
71 #define MAX_TRANSMIT_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 45)
76 * Maximum number of requests (from other peers) that we're
77 * willing to have pending at any given point in time.
78 * FIXME: set from configuration.
80 static uint64_t max_pending_requests = (32 * 1024);
84 * Information we keep for each pending reply. The
85 * actual message follows at the end of this struct.
87 struct PendingMessage;
90 * Our connection to the datastore.
92 static struct GNUNET_DATASTORE_Handle *dsh;
96 * Function called upon completion of a transmission.
99 * @param pid ID of receiving peer, 0 on transmission error
101 typedef void (*TransmissionContinuation)(void * cls,
102 GNUNET_PEER_Id tpid);
106 * Information we keep for each pending message (GET/PUT). The
107 * actual message follows at the end of this struct.
109 struct PendingMessage
112 * This is a doubly-linked list of messages to the same peer.
114 struct PendingMessage *next;
117 * This is a doubly-linked list of messages to the same peer.
119 struct PendingMessage *prev;
122 * Entry in pending message list for this pending message.
124 struct PendingMessageList *pml;
127 * Function to call immediately once we have transmitted this
130 TransmissionContinuation cont;
138 * Size of the reply; actual reply message follows
139 * at the end of this struct.
144 * How important is this message for us?
152 * Information about a peer that we are connected to.
153 * We track data that is useful for determining which
154 * peers should receive our requests. We also keep
155 * a list of messages to transmit to this peer.
161 * List of the last clients for which this peer successfully
164 struct GNUNET_SERVER_Client *last_client_replies[CS2P_SUCCESS_LIST_SIZE];
167 * List of the last PIDs for which
168 * this peer successfully answered a query;
169 * We use 0 to indicate no successful reply.
171 GNUNET_PEER_Id last_p2p_replies[P2P_SUCCESS_LIST_SIZE];
174 * Average delay between sending the peer a request and
175 * getting a reply (only calculated over the requests for
176 * which we actually got a reply). Calculated
177 * as a moving average: new_delay = ((n-1)*last_delay+curr_delay) / n
179 struct GNUNET_TIME_Relative avg_delay;
182 * Handle for an active request for transmission to this
185 struct GNUNET_CORE_TransmitHandle *cth;
188 * Messages (replies, queries, content migration) we would like to
189 * send to this peer in the near future. Sorted by priority, head.
191 struct PendingMessage *pending_messages_head;
194 * Messages (replies, queries, content migration) we would like to
195 * send to this peer in the near future. Sorted by priority, tail.
197 struct PendingMessage *pending_messages_tail;
200 * Average priority of successful replies. Calculated
201 * as a moving average: new_avg = ((n-1)*last_avg+curr_prio) / n
206 * Increase in traffic preference still to be submitted
207 * to the core service for this peer. FIXME: double or 'uint64_t'?
209 double inc_preference;
212 * The peer's identity.
217 * Size of the linked list of 'pending_messages'.
219 unsigned int pending_requests;
222 * Which offset in "last_p2p_replies" will be updated next?
223 * (we go round-robin).
225 unsigned int last_p2p_replies_woff;
228 * Which offset in "last_client_replies" will be updated next?
229 * (we go round-robin).
231 unsigned int last_client_replies_woff;
237 * Information we keep for each pending request. We should try to
238 * keep this struct as small as possible since its memory consumption
239 * is key to how many requests we can have pending at once.
241 struct PendingRequest;
245 * Doubly-linked list of requests we are performing
246 * on behalf of the same client.
248 struct ClientRequestList
252 * This is a doubly-linked list.
254 struct ClientRequestList *next;
257 * This is a doubly-linked list.
259 struct ClientRequestList *prev;
262 * Request this entry represents.
264 struct PendingRequest *req;
267 * Client list this request belongs to.
269 struct ClientList *client_list;
275 * Replies to be transmitted to the client. The actual
276 * response message is allocated after this struct.
278 struct ClientResponseMessage
281 * This is a doubly-linked list.
283 struct ClientResponseMessage *next;
286 * This is a doubly-linked list.
288 struct ClientResponseMessage *prev;
291 * Client list entry this response belongs to.
293 struct ClientList *client_list;
296 * Number of bytes in the response.
303 * Linked list of clients we are performing requests
309 * This is a linked list.
311 struct ClientList *next;
314 * ID of a client making a request, NULL if this entry is for a
317 struct GNUNET_SERVER_Client *client;
320 * Head of list of requests performed on behalf
321 * of this client right now.
323 struct ClientRequestList *rl_head;
326 * Tail of list of requests performed on behalf
327 * of this client right now.
329 struct ClientRequestList *rl_tail;
332 * Head of linked list of responses.
334 struct ClientResponseMessage *res_head;
337 * Tail of linked list of responses.
339 struct ClientResponseMessage *res_tail;
342 * Context for sending replies.
344 struct GNUNET_CONNECTION_TransmitHandle *th;
350 * Doubly-linked list of messages we are performing
351 * due to a pending request.
353 struct PendingMessageList
357 * This is a doubly-linked list of messages on behalf of the same request.
359 struct PendingMessageList *next;
362 * This is a doubly-linked list of messages on behalf of the same request.
364 struct PendingMessageList *prev;
367 * Message this entry represents.
369 struct PendingMessage *pm;
372 * Request this entry belongs to.
374 struct PendingRequest *req;
377 * Peer this message is targeted for.
379 struct ConnectedPeer *target;
385 * Information we keep for each pending request. We should try to
386 * keep this struct as small as possible since its memory consumption
387 * is key to how many requests we can have pending at once.
389 struct PendingRequest
393 * If this request was made by a client, this is our entry in the
394 * client request list; otherwise NULL.
396 struct ClientRequestList *client_request_list;
399 * Entry of peer responsible for this entry (if this request
400 * was made by a peer).
402 struct ConnectedPeer *cp;
405 * If this is a namespace query, pointer to the hash of the public
406 * key of the namespace; otherwise NULL. Pointer will be to the
407 * end of this struct (so no need to free it).
409 const GNUNET_HashCode *namespace;
412 * Bloomfilter we use to filter out replies that we don't care about
413 * (anymore). NULL as long as we are interested in all replies.
415 struct GNUNET_CONTAINER_BloomFilter *bf;
418 * Context of our GNUNET_CORE_peer_change_preference call.
420 struct GNUNET_CORE_InformationRequestContext *irc;
423 * Hash code of all replies that we have seen so far (only valid
424 * if client is not NULL since we only track replies like this for
427 GNUNET_HashCode *replies_seen;
430 * Node in the heap representing this entry; NULL
431 * if we have no heap node.
433 struct GNUNET_CONTAINER_HeapNode *hnode;
436 * Head of list of messages being performed on behalf of this
439 struct PendingMessageList *pending_head;
442 * Tail of list of messages being performed on behalf of this
445 struct PendingMessageList *pending_tail;
448 * When did we first see this request (form this peer), or, if our
449 * client is initiating, when did we last initiate a search?
451 struct GNUNET_TIME_Absolute start_time;
454 * The query that this request is for.
456 GNUNET_HashCode query;
459 * The task responsible for transmitting queries
462 GNUNET_SCHEDULER_TaskIdentifier task;
465 * (Interned) Peer identifier that identifies a preferred target
468 GNUNET_PEER_Id target_pid;
471 * (Interned) Peer identifiers of peers that have already
472 * received our query for this content.
474 GNUNET_PEER_Id *used_pids;
477 * Our entry in the queue (non-NULL while we wait for our
478 * turn to interact with the local database).
480 struct GNUNET_DATASTORE_QueueEntry *qe;
484 * Size of the 'bf' (in bytes).
489 * Desired anonymity level; only valid for requests from a local client.
491 uint32_t anonymity_level;
494 * How many entries in "used_pids" are actually valid?
496 unsigned int used_pids_off;
499 * How long is the "used_pids" array?
501 unsigned int used_pids_size;
504 * Number of results found for this request.
506 unsigned int results_found;
509 * How many entries in "replies_seen" are actually valid?
511 unsigned int replies_seen_off;
514 * How long is the "replies_seen" array?
516 unsigned int replies_seen_size;
519 * Priority with which this request was made. If one of our clients
520 * made the request, then this is the current priority that we are
521 * using when initiating the request. This value is used when
522 * we decide to reward other peers with trust for providing a reply.
527 * Priority points left for us to spend when forwarding this request
530 uint32_t remaining_priority;
533 * Number to mingle hashes for bloom-filter tests with.
538 * TTL with which we saw this request (or, if we initiated, TTL that
539 * we used for the request).
544 * Type of the content that this request is for.
546 enum GNUNET_BLOCK_Type type;
549 * Remove this request after transmission of the current response.
554 * GNUNET_YES if we should not forward this request to other peers.
562 * Block that is ready for migration to other peers. Actual data is at the end of the block.
564 struct MigrationReadyBlock
568 * This is a doubly-linked list.
570 struct MigrationReadyBlock *next;
573 * This is a doubly-linked list.
575 struct MigrationReadyBlock *prev;
578 * Query for the block.
580 GNUNET_HashCode query;
583 * When does this block expire?
585 struct GNUNET_TIME_Absolute expiration;
588 * Peers we would consider forwarding this
589 * block to. Zero for empty entries.
591 GNUNET_PEER_Id target_list[MIGRATION_LIST_SIZE];
599 * Number of targets already used.
601 unsigned int used_targets;
606 enum GNUNET_BLOCK_Type type;
613 static struct GNUNET_SCHEDULER_Handle *sched;
618 static const struct GNUNET_CONFIGURATION_Handle *cfg;
621 * Map of peer identifiers to "struct ConnectedPeer" (for that peer).
623 static struct GNUNET_CONTAINER_MultiHashMap *connected_peers;
626 * Map of peer identifiers to "struct PendingRequest" (for that peer).
628 static struct GNUNET_CONTAINER_MultiHashMap *peer_request_map;
631 * Map of query identifiers to "struct PendingRequest" (for that query).
633 static struct GNUNET_CONTAINER_MultiHashMap *query_request_map;
636 * Heap with the request that will expire next at the top. Contains
637 * pointers of type "struct PendingRequest*"; these will *also* be
638 * aliased from the "requests_by_peer" data structures and the
639 * "requests_by_query" table. Note that requests from our clients
640 * don't expire and are thus NOT in the "requests_by_expiration"
641 * (or the "requests_by_peer" tables).
643 static struct GNUNET_CONTAINER_Heap *requests_by_expiration_heap;
646 * Handle for reporting statistics.
648 static struct GNUNET_STATISTICS_Handle *stats;
651 * Linked list of clients we are currently processing requests for.
653 static struct ClientList *client_list;
656 * Pointer to handle to the core service (points to NULL until we've
659 static struct GNUNET_CORE_Handle *core;
662 * Head of linked list of blocks that can be migrated.
664 static struct MigrationReadyBlock *mig_head;
667 * Tail of linked list of blocks that can be migrated.
669 static struct MigrationReadyBlock *mig_tail;
672 * Request to datastore for migration (or NULL).
674 static struct GNUNET_DATASTORE_QueueEntry *mig_qe;
677 * ID of task that collects blocks for migration.
679 static GNUNET_SCHEDULER_TaskIdentifier mig_task;
682 * What is the maximum frequency at which we are allowed to
683 * poll the datastore for migration content?
685 static struct GNUNET_TIME_Relative min_migration_delay;
688 * Size of the doubly-linked list of migration blocks.
690 static unsigned int mig_size;
693 * Are we allowed to migrate content to this peer.
695 static int active_migration;
699 * Transmit messages by copying it to the target buffer
700 * "buf". "buf" will be NULL and "size" zero if the socket was closed
701 * for writing in the meantime. In that case, do nothing
702 * (the disconnect or shutdown handler will take care of the rest).
703 * If we were able to transmit messages and there are still more
704 * pending, ask core again for further calls to this function.
706 * @param cls closure, pointer to the 'struct ConnectedPeer*'
707 * @param size number of bytes available in buf
708 * @param buf where the callee should write the message
709 * @return number of bytes written to buf
712 transmit_to_peer (void *cls,
713 size_t size, void *buf);
716 /* ******************* clean up functions ************************ */
720 * Delete the given migration block.
722 * @param mb block to delete
725 delete_migration_block (struct MigrationReadyBlock *mb)
727 GNUNET_CONTAINER_DLL_remove (mig_head,
730 GNUNET_PEER_decrement_rcs (mb->target_list,
731 MIGRATION_LIST_SIZE);
738 * Compare the distance of two peers to a key.
741 * @param p1 first peer
742 * @param p2 second peer
743 * @return GNUNET_YES if P1 is closer to key than P2
746 is_closer (const GNUNET_HashCode *key,
747 const struct GNUNET_PeerIdentity *p1,
748 const struct GNUNET_PeerIdentity *p2)
750 return GNUNET_CRYPTO_hash_xorcmp (&p1->hashPubKey,
757 * Consider migrating content to a given peer.
759 * @param cls 'struct MigrationReadyBlock*' to select
760 * targets for (or NULL for none)
761 * @param key ID of the peer
762 * @param value 'struct ConnectedPeer' of the peer
763 * @return GNUNET_YES (always continue iteration)
766 consider_migration (void *cls,
767 const GNUNET_HashCode *key,
770 struct MigrationReadyBlock *mb = cls;
771 struct ConnectedPeer *cp = value;
772 struct MigrationReadyBlock *pos;
773 struct GNUNET_PeerIdentity cppid;
774 struct GNUNET_PeerIdentity otherpid;
775 struct GNUNET_PeerIdentity worstpid;
780 /* consider 'cp' as a migration target for mb */
783 GNUNET_PEER_resolve (cp->pid,
785 repl = MIGRATION_LIST_SIZE;
786 for (i=0;i<MIGRATION_LIST_SIZE;i++)
788 if (mb->target_list[i] == 0)
790 mb->target_list[i] = cp->pid;
791 GNUNET_PEER_change_rc (mb->target_list[i], 1);
792 repl = MIGRATION_LIST_SIZE;
795 GNUNET_PEER_resolve (mb->target_list[i],
797 if ( (repl == MIGRATION_LIST_SIZE) &&
798 is_closer (&mb->query,
805 else if ( (repl != MIGRATION_LIST_SIZE) &&
806 (is_closer (&mb->query,
814 if (repl != MIGRATION_LIST_SIZE)
816 GNUNET_PEER_change_rc (mb->target_list[repl], -1);
817 mb->target_list[repl] = cp->pid;
818 GNUNET_PEER_change_rc (mb->target_list[repl], 1);
822 /* consider scheduling transmission to cp for content migration */
829 for (i=0;i<MIGRATION_LIST_SIZE;i++)
831 if (cp->pid == pos->target_list[i])
836 msize = GNUNET_MIN (msize,
844 return GNUNET_YES; /* no content available */
846 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
847 "Trying to migrate at least %u bytes to peer `%s'\n",
852 = GNUNET_CORE_notify_transmit_ready (core,
853 0, GNUNET_TIME_UNIT_FOREVER_REL,
854 (const struct GNUNET_PeerIdentity*) key,
855 msize + sizeof (struct PutMessage),
863 * Task that is run periodically to obtain blocks for content
867 * @param tc scheduler context (also unused)
870 gather_migration_blocks (void *cls,
871 const struct GNUNET_SCHEDULER_TaskContext *tc);
875 * If the migration task is not currently running, consider
876 * (re)scheduling it with the appropriate delay.
879 consider_migration_gathering ()
881 struct GNUNET_TIME_Relative delay;
885 if (mig_task != GNUNET_SCHEDULER_NO_TASK)
887 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
889 delay = GNUNET_TIME_relative_divide (delay,
890 MAX_MIGRATION_QUEUE);
891 delay = GNUNET_TIME_relative_max (delay,
892 min_migration_delay);
893 mig_task = GNUNET_SCHEDULER_add_delayed (sched,
895 &gather_migration_blocks,
901 * Process content offered for migration.
904 * @param key key for the content
905 * @param size number of bytes in data
906 * @param data content stored
907 * @param type type of the content
908 * @param priority priority of the content
909 * @param anonymity anonymity-level for the content
910 * @param expiration expiration time for the content
911 * @param uid unique identifier for the datum;
912 * maybe 0 if no unique identifier is available
915 process_migration_content (void *cls,
916 const GNUNET_HashCode * key,
919 enum GNUNET_BLOCK_Type type,
922 struct GNUNET_TIME_Absolute
923 expiration, uint64_t uid)
925 struct MigrationReadyBlock *mb;
930 if (mig_size < MAX_MIGRATION_QUEUE)
931 consider_migration_gathering ();
934 if (type == GNUNET_BLOCK_TYPE_ONDEMAND)
937 GNUNET_FS_handle_on_demand_block (key, size, data,
938 type, priority, anonymity,
940 &process_migration_content,
942 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
946 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
947 "Retrieved block `%s' of type %u for migration\n",
951 mb = GNUNET_malloc (sizeof (struct MigrationReadyBlock) + size);
953 mb->expiration = expiration;
956 memcpy (&mb[1], data, size);
957 GNUNET_CONTAINER_DLL_insert_after (mig_head,
962 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
965 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
970 * Task that is run periodically to obtain blocks for content
974 * @param tc scheduler context (also unused)
977 gather_migration_blocks (void *cls,
978 const struct GNUNET_SCHEDULER_TaskContext *tc)
980 mig_task = GNUNET_SCHEDULER_NO_TASK;
981 mig_qe = GNUNET_DATASTORE_get_random (dsh, 0, -1,
982 GNUNET_TIME_UNIT_FOREVER_REL,
983 &process_migration_content, NULL);
984 GNUNET_assert (mig_qe != NULL);
989 * We're done with a particular message list entry.
990 * Free all associated resources.
992 * @param pml entry to destroy
995 destroy_pending_message_list_entry (struct PendingMessageList *pml)
997 GNUNET_CONTAINER_DLL_remove (pml->req->pending_head,
998 pml->req->pending_tail,
1000 GNUNET_CONTAINER_DLL_remove (pml->target->pending_messages_head,
1001 pml->target->pending_messages_tail,
1003 pml->target->pending_requests--;
1004 GNUNET_free (pml->pm);
1010 * Destroy the given pending message (and call the respective
1013 * @param pm message to destroy
1014 * @param tpid id of peer that the message was delivered to, or 0 for none
1017 destroy_pending_message (struct PendingMessage *pm,
1018 GNUNET_PEER_Id tpid)
1020 struct PendingMessageList *pml = pm->pml;
1021 TransmissionContinuation cont;
1024 GNUNET_assert (pml->pm == pm);
1025 GNUNET_assert ( (tpid == 0) || (tpid == pml->target->pid) );
1027 cont_cls = pm->cont_cls;
1028 destroy_pending_message_list_entry (pml);
1029 cont (cont_cls, tpid);
1034 * We're done processing a particular request.
1035 * Free all associated resources.
1037 * @param pr request to destroy
1040 destroy_pending_request (struct PendingRequest *pr)
1042 struct GNUNET_PeerIdentity pid;
1044 if (pr->hnode != NULL)
1046 GNUNET_CONTAINER_heap_remove_node (requests_by_expiration_heap,
1050 if (NULL == pr->client_request_list)
1052 GNUNET_STATISTICS_update (stats,
1053 gettext_noop ("# P2P searches active"),
1059 GNUNET_STATISTICS_update (stats,
1060 gettext_noop ("# client searches active"),
1064 /* might have already been removed from map in 'process_reply' (if
1065 there was a unique reply) or never inserted if it was a
1066 duplicate; hence ignore the return value here */
1067 (void) GNUNET_CONTAINER_multihashmap_remove (query_request_map,
1072 GNUNET_DATASTORE_cancel (pr->qe);
1075 if (pr->client_request_list != NULL)
1077 GNUNET_CONTAINER_DLL_remove (pr->client_request_list->client_list->rl_head,
1078 pr->client_request_list->client_list->rl_tail,
1079 pr->client_request_list);
1080 GNUNET_free (pr->client_request_list);
1081 pr->client_request_list = NULL;
1085 GNUNET_PEER_resolve (pr->cp->pid,
1087 (void) GNUNET_CONTAINER_multihashmap_remove (peer_request_map,
1094 GNUNET_CONTAINER_bloomfilter_free (pr->bf);
1097 if (pr->irc != NULL)
1099 GNUNET_CORE_peer_change_preference_cancel (pr->irc);
1102 if (pr->replies_seen != NULL)
1104 GNUNET_free (pr->replies_seen);
1105 pr->replies_seen = NULL;
1107 if (pr->task != GNUNET_SCHEDULER_NO_TASK)
1109 GNUNET_SCHEDULER_cancel (sched,
1111 pr->task = GNUNET_SCHEDULER_NO_TASK;
1113 while (NULL != pr->pending_head)
1114 destroy_pending_message_list_entry (pr->pending_head);
1115 GNUNET_PEER_change_rc (pr->target_pid, -1);
1116 if (pr->used_pids != NULL)
1118 GNUNET_PEER_decrement_rcs (pr->used_pids, pr->used_pids_off);
1119 GNUNET_free (pr->used_pids);
1120 pr->used_pids_off = 0;
1121 pr->used_pids_size = 0;
1122 pr->used_pids = NULL;
1129 * Method called whenever a given peer connects.
1131 * @param cls closure, not used
1132 * @param peer peer identity this notification is about
1133 * @param latency reported latency of the connection with 'other'
1134 * @param distance reported distance (DV) to 'other'
1137 peer_connect_handler (void *cls,
1139 GNUNET_PeerIdentity * peer,
1140 struct GNUNET_TIME_Relative latency,
1143 struct ConnectedPeer *cp;
1144 struct MigrationReadyBlock *pos;
1146 cp = GNUNET_malloc (sizeof (struct ConnectedPeer));
1147 cp->pid = GNUNET_PEER_intern (peer);
1148 GNUNET_break (GNUNET_OK ==
1149 GNUNET_CONTAINER_multihashmap_put (connected_peers,
1152 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1157 (void) consider_migration (pos, &peer->hashPubKey, cp);
1165 * Free (each) request made by the peer.
1167 * @param cls closure, points to peer that the request belongs to
1168 * @param key current key code
1169 * @param value value in the hash map
1170 * @return GNUNET_YES (we should continue to iterate)
1173 destroy_request (void *cls,
1174 const GNUNET_HashCode * key,
1177 const struct GNUNET_PeerIdentity * peer = cls;
1178 struct PendingRequest *pr = value;
1180 GNUNET_break (GNUNET_YES ==
1181 GNUNET_CONTAINER_multihashmap_remove (peer_request_map,
1184 destroy_pending_request (pr);
1190 * Method called whenever a peer disconnects.
1192 * @param cls closure, not used
1193 * @param peer peer identity this notification is about
1196 peer_disconnect_handler (void *cls,
1198 GNUNET_PeerIdentity * peer)
1200 struct ConnectedPeer *cp;
1201 struct PendingMessage *pm;
1203 struct MigrationReadyBlock *pos;
1204 struct MigrationReadyBlock *next;
1206 GNUNET_CONTAINER_multihashmap_get_multiple (peer_request_map,
1210 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
1214 for (i=0;i<CS2P_SUCCESS_LIST_SIZE;i++)
1216 if (NULL != cp->last_client_replies[i])
1218 GNUNET_SERVER_client_drop (cp->last_client_replies[i]);
1219 cp->last_client_replies[i] = NULL;
1222 GNUNET_break (GNUNET_YES ==
1223 GNUNET_CONTAINER_multihashmap_remove (connected_peers,
1226 /* remove this peer from migration considerations; schedule
1229 while (NULL != (pos = next))
1232 for (i=0;i<MIGRATION_LIST_SIZE;i++)
1234 if (pos->target_list[i] == cp->pid)
1236 GNUNET_PEER_change_rc (pos->target_list[i], -1);
1237 pos->target_list[i] = 0;
1240 if (pos->used_targets >= GNUNET_CONTAINER_multihashmap_size (connected_peers))
1242 delete_migration_block (pos);
1243 consider_migration_gathering ();
1246 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
1247 &consider_migration,
1251 GNUNET_PEER_change_rc (cp->pid, -1);
1252 GNUNET_PEER_decrement_rcs (cp->last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
1253 if (NULL != cp->cth)
1254 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1255 while (NULL != (pm = cp->pending_messages_head))
1256 destroy_pending_message (pm, 0 /* delivery failed */);
1257 GNUNET_break (0 == cp->pending_requests);
1263 * Iterator over hash map entries that removes all occurences
1264 * of the given 'client' from the 'last_client_replies' of the
1265 * given connected peer.
1267 * @param cls closure, the 'struct GNUNET_SERVER_Client*' to remove
1268 * @param key current key code (unused)
1269 * @param value value in the hash map (the 'struct ConnectedPeer*' to change)
1270 * @return GNUNET_YES (we should continue to iterate)
1273 remove_client_from_last_client_replies (void *cls,
1274 const GNUNET_HashCode * key,
1277 struct GNUNET_SERVER_Client *client = cls;
1278 struct ConnectedPeer *cp = value;
1281 for (i=0;i<CS2P_SUCCESS_LIST_SIZE;i++)
1283 if (cp->last_client_replies[i] == client)
1285 GNUNET_SERVER_client_drop (cp->last_client_replies[i]);
1286 cp->last_client_replies[i] = NULL;
1294 * A client disconnected. Remove all of its pending queries.
1296 * @param cls closure, NULL
1297 * @param client identification of the client
1300 handle_client_disconnect (void *cls,
1301 struct GNUNET_SERVER_Client
1304 struct ClientList *pos;
1305 struct ClientList *prev;
1306 struct ClientRequestList *rcl;
1307 struct ClientResponseMessage *creply;
1313 while ( (NULL != pos) &&
1314 (pos->client != client) )
1320 return; /* no requests pending for this client */
1321 while (NULL != (rcl = pos->rl_head))
1323 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1324 "Destroying pending request `%s' on disconnect\n",
1325 GNUNET_h2s (&rcl->req->query));
1326 destroy_pending_request (rcl->req);
1329 client_list = pos->next;
1331 prev->next = pos->next;
1332 if (pos->th != NULL)
1334 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
1337 while (NULL != (creply = pos->res_head))
1339 GNUNET_CONTAINER_DLL_remove (pos->res_head,
1342 GNUNET_free (creply);
1344 GNUNET_SERVER_client_drop (pos->client);
1346 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
1347 &remove_client_from_last_client_replies,
1353 * Iterator to free peer entries.
1355 * @param cls closure, unused
1356 * @param key current key code
1357 * @param value value in the hash map (peer entry)
1358 * @return GNUNET_YES (we should continue to iterate)
1361 clean_peer (void *cls,
1362 const GNUNET_HashCode * key,
1365 peer_disconnect_handler (NULL, (const struct GNUNET_PeerIdentity*) key);
1371 * Task run during shutdown.
1377 shutdown_task (void *cls,
1378 const struct GNUNET_SCHEDULER_TaskContext *tc)
1382 GNUNET_DATASTORE_cancel (mig_qe);
1385 if (GNUNET_SCHEDULER_NO_TASK != mig_task)
1387 GNUNET_SCHEDULER_cancel (sched, mig_task);
1388 mig_task = GNUNET_SCHEDULER_NO_TASK;
1390 while (client_list != NULL)
1391 handle_client_disconnect (NULL,
1392 client_list->client);
1393 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
1396 GNUNET_break (0 == GNUNET_CONTAINER_heap_get_size (requests_by_expiration_heap));
1397 GNUNET_CONTAINER_heap_destroy (requests_by_expiration_heap);
1398 requests_by_expiration_heap = 0;
1399 GNUNET_CONTAINER_multihashmap_destroy (connected_peers);
1400 connected_peers = NULL;
1401 GNUNET_break (0 == GNUNET_CONTAINER_multihashmap_size (query_request_map));
1402 GNUNET_CONTAINER_multihashmap_destroy (query_request_map);
1403 query_request_map = NULL;
1404 GNUNET_break (0 == GNUNET_CONTAINER_multihashmap_size (peer_request_map));
1405 GNUNET_CONTAINER_multihashmap_destroy (peer_request_map);
1406 peer_request_map = NULL;
1407 GNUNET_assert (NULL != core);
1408 GNUNET_CORE_disconnect (core);
1412 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
1415 GNUNET_DATASTORE_disconnect (dsh,
1417 while (mig_head != NULL)
1418 delete_migration_block (mig_head);
1419 GNUNET_assert (0 == mig_size);
1426 /* ******************* Utility functions ******************** */
1430 * Transmit messages by copying it to the target buffer
1431 * "buf". "buf" will be NULL and "size" zero if the socket was closed
1432 * for writing in the meantime. In that case, do nothing
1433 * (the disconnect or shutdown handler will take care of the rest).
1434 * If we were able to transmit messages and there are still more
1435 * pending, ask core again for further calls to this function.
1437 * @param cls closure, pointer to the 'struct ConnectedPeer*'
1438 * @param size number of bytes available in buf
1439 * @param buf where the callee should write the message
1440 * @return number of bytes written to buf
1443 transmit_to_peer (void *cls,
1444 size_t size, void *buf)
1446 struct ConnectedPeer *cp = cls;
1448 struct GNUNET_PeerIdentity pid;
1449 struct PendingMessage *pm;
1450 struct MigrationReadyBlock *mb;
1451 struct MigrationReadyBlock *next;
1452 struct PutMessage migm;
1460 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1461 "Dropping message, core too busy.\n");
1466 while ( (NULL != (pm = cp->pending_messages_head) ) &&
1467 (pm->msize <= size) )
1469 memcpy (&cbuf[msize], &pm[1], pm->msize);
1472 destroy_pending_message (pm, cp->pid);
1476 GNUNET_PEER_resolve (cp->pid,
1478 cp->cth = GNUNET_CORE_notify_transmit_ready (core,
1480 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
1489 while (NULL != (mb = next))
1492 for (i=0;i<MIGRATION_LIST_SIZE;i++)
1494 if ( (cp->pid == mb->target_list[i]) &&
1495 (mb->size + sizeof (migm) <= size) )
1497 GNUNET_PEER_change_rc (mb->target_list[i], -1);
1498 mb->target_list[i] = 0;
1500 migm.header.size = htons (sizeof (migm) + mb->size);
1501 migm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
1502 migm.type = htonl (mb->type);
1503 migm.expiration = GNUNET_TIME_absolute_hton (mb->expiration);
1504 memcpy (&cbuf[msize], &migm, sizeof (migm));
1505 msize += sizeof (migm);
1506 size -= sizeof (migm);
1507 memcpy (&cbuf[msize], &mb[1], mb->size);
1511 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1512 "Pushing migration block `%s' (%u bytes) to `%s'\n",
1513 GNUNET_h2s (&mb->query),
1522 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1523 "Migration block `%s' (%u bytes) is not on migration list for peer `%s'\n",
1524 GNUNET_h2s (&mb->query),
1530 if ( (mb->used_targets >= MIGRATION_TARGET_COUNT) ||
1531 (mb->used_targets >= GNUNET_CONTAINER_multihashmap_size (connected_peers)) )
1533 delete_migration_block (mb);
1534 consider_migration_gathering ();
1537 consider_migration (NULL,
1542 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1543 "Transmitting %u bytes to peer %u\n",
1552 * Add a message to the set of pending messages for the given peer.
1554 * @param cp peer to send message to
1555 * @param pm message to queue
1556 * @param pr request on which behalf this message is being queued
1559 add_to_pending_messages_for_peer (struct ConnectedPeer *cp,
1560 struct PendingMessage *pm,
1561 struct PendingRequest *pr)
1563 struct PendingMessage *pos;
1564 struct PendingMessageList *pml;
1565 struct GNUNET_PeerIdentity pid;
1567 GNUNET_assert (pm->next == NULL);
1568 GNUNET_assert (pm->pml == NULL);
1569 pml = GNUNET_malloc (sizeof (struct PendingMessageList));
1574 GNUNET_CONTAINER_DLL_insert (pr->pending_head,
1577 pos = cp->pending_messages_head;
1578 while ( (pos != NULL) &&
1579 (pm->priority < pos->priority) )
1581 GNUNET_CONTAINER_DLL_insert_after (cp->pending_messages_head,
1582 cp->pending_messages_tail,
1585 cp->pending_requests++;
1586 if (cp->pending_requests > MAX_QUEUE_PER_PEER)
1587 destroy_pending_message (cp->pending_messages_tail, 0);
1588 GNUNET_PEER_resolve (cp->pid, &pid);
1589 if (NULL != cp->cth)
1590 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1591 /* need to schedule transmission */
1592 cp->cth = GNUNET_CORE_notify_transmit_ready (core,
1593 cp->pending_messages_head->priority,
1596 cp->pending_messages_head->msize,
1599 if (cp->cth == NULL)
1602 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1603 "Failed to schedule transmission with core!\n");
1605 GNUNET_STATISTICS_update (stats,
1606 gettext_noop ("# CORE transmission failures"),
1614 * Mingle hash with the mingle_number to produce different bits.
1617 mingle_hash (const GNUNET_HashCode * in,
1618 int32_t mingle_number,
1619 GNUNET_HashCode * hc)
1623 GNUNET_CRYPTO_hash (&mingle_number,
1626 GNUNET_CRYPTO_hash_xor (&m, in, hc);
1631 * Test if the load on this peer is too high
1632 * to even consider processing the query at
1635 * @return GNUNET_YES if the load is too high, GNUNET_NO otherwise
1638 test_load_too_high ()
1640 return GNUNET_NO; // FIXME
1644 /* ******************* Pending Request Refresh Task ******************** */
1649 * We use a random delay to make the timing of requests less
1650 * predictable. This function returns such a random delay. We add a base
1651 * delay of MAX_CORK_DELAY (1s).
1653 * FIXME: make schedule dependent on the specifics of the request?
1654 * Or bandwidth and number of connected peers and load?
1656 * @return random delay to use for some request, between 1s and 1000+TTL_DECREMENT ms
1658 static struct GNUNET_TIME_Relative
1659 get_processing_delay ()
1662 GNUNET_TIME_relative_add (GNUNET_CONSTANTS_MAX_CORK_DELAY,
1663 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
1664 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1670 * We're processing a GET request from another peer and have decided
1671 * to forward it to other peers. This function is called periodically
1672 * and should forward the request to other peers until we have all
1673 * possible replies. If we have transmitted the *only* reply to
1674 * the initiator we should destroy the pending request. If we have
1675 * many replies in the queue to the initiator, we should delay sending
1676 * out more queries until the reply queue has shrunk some.
1678 * @param cls our "struct ProcessGetContext *"
1682 forward_request_task (void *cls,
1683 const struct GNUNET_SCHEDULER_TaskContext *tc);
1687 * Function called after we either failed or succeeded
1688 * at transmitting a query to a peer.
1690 * @param cls the requests "struct PendingRequest*"
1691 * @param tpid ID of receiving peer, 0 on transmission error
1694 transmit_query_continuation (void *cls,
1695 GNUNET_PEER_Id tpid)
1697 struct PendingRequest *pr = cls;
1699 GNUNET_STATISTICS_update (stats,
1700 gettext_noop ("# queries scheduled for forwarding"),
1706 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1707 "Transmission of request failed, will try again later.\n");
1709 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
1710 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
1711 get_processing_delay (),
1712 &forward_request_task,
1716 GNUNET_STATISTICS_update (stats,
1717 gettext_noop ("# queries forwarded"),
1720 GNUNET_PEER_change_rc (tpid, 1);
1721 if (pr->used_pids_off == pr->used_pids_size)
1722 GNUNET_array_grow (pr->used_pids,
1724 pr->used_pids_size * 2 + 2);
1725 pr->used_pids[pr->used_pids_off++] = tpid;
1726 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
1727 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
1728 get_processing_delay (),
1729 &forward_request_task,
1735 * How many bytes should a bloomfilter be if we have already seen
1736 * entry_count responses? Note that BLOOMFILTER_K gives us the number
1737 * of bits set per entry. Furthermore, we should not re-size the
1738 * filter too often (to keep it cheap).
1740 * Since other peers will also add entries but not resize the filter,
1741 * we should generally pick a slightly larger size than what the
1742 * strict math would suggest.
1744 * @return must be a power of two and smaller or equal to 2^15.
1747 compute_bloomfilter_size (unsigned int entry_count)
1750 unsigned int ideal = (entry_count * BLOOMFILTER_K) / 4;
1751 uint16_t max = 1 << 15;
1753 if (entry_count > max)
1756 while ((size < max) && (size < ideal))
1765 * Recalculate our bloom filter for filtering replies. This function
1766 * will create a new bloom filter from scratch, so it should only be
1767 * called if we have no bloomfilter at all (and hence can create a
1768 * fresh one of minimal size without problems) OR if our peer is the
1769 * initiator (in which case we may resize to larger than mimimum size).
1771 * @param pr request for which the BF is to be recomputed
1774 refresh_bloomfilter (struct PendingRequest *pr)
1778 GNUNET_HashCode mhash;
1780 nsize = compute_bloomfilter_size (pr->replies_seen_off);
1781 if (nsize == pr->bf_size)
1782 return; /* size not changed */
1784 GNUNET_CONTAINER_bloomfilter_free (pr->bf);
1785 pr->bf_size = nsize;
1786 pr->mingle = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, -1);
1787 pr->bf = GNUNET_CONTAINER_bloomfilter_init (NULL,
1790 for (i=0;i<pr->replies_seen_off;i++)
1792 mingle_hash (&pr->replies_seen[i], pr->mingle, &mhash);
1793 GNUNET_CONTAINER_bloomfilter_add (pr->bf, &mhash);
1799 * Function called after we've tried to reserve a certain amount of
1800 * bandwidth for a reply. Check if we succeeded and if so send our
1803 * @param cls the requests "struct PendingRequest*"
1804 * @param peer identifies the peer
1805 * @param bpm_in set to the current bandwidth limit (receiving) for this peer
1806 * @param bpm_out set to the current bandwidth limit (sending) for this peer
1807 * @param amount set to the amount that was actually reserved or unreserved
1808 * @param preference current traffic preference for the given peer
1811 target_reservation_cb (void *cls,
1813 GNUNET_PeerIdentity * peer,
1814 struct GNUNET_BANDWIDTH_Value32NBO bpm_in,
1815 struct GNUNET_BANDWIDTH_Value32NBO bpm_out,
1817 uint64_t preference)
1819 struct PendingRequest *pr = cls;
1820 struct ConnectedPeer *cp;
1821 struct PendingMessage *pm;
1822 struct GetMessage *gm;
1823 GNUNET_HashCode *ext;
1833 /* error in communication with core, try again later */
1834 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
1835 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
1836 get_processing_delay (),
1837 &forward_request_task,
1841 // (3) transmit, update ttl/priority
1842 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
1846 /* Peer must have just left */
1848 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1849 "Selected peer disconnected!\n");
1851 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
1852 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
1853 get_processing_delay (),
1854 &forward_request_task,
1858 no_route = GNUNET_NO;
1859 /* FIXME: check against DBLOCK_SIZE and possibly return
1860 amount to reserve; however, this also needs to work
1861 with testcases which currently start out with a far
1862 too low per-peer bw limit, so they would never send
1863 anything. Big issue. */
1869 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1870 "Failed to reserve bandwidth for reply (got %d/%u bytes only)!\n",
1874 GNUNET_STATISTICS_update (stats,
1875 gettext_noop ("# reply bandwidth reservation requests failed"),
1878 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
1879 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
1880 get_processing_delay (),
1881 &forward_request_task,
1883 return; /* this target round failed */
1885 /* FIXME: if we are "quite" busy, we may still want to skip
1886 this round; need more load detection code! */
1887 no_route = GNUNET_YES;
1890 GNUNET_STATISTICS_update (stats,
1891 gettext_noop ("# queries scheduled for forwarding"),
1894 /* build message and insert message into priority queue */
1896 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1897 "Forwarding request `%s' to `%4s'!\n",
1898 GNUNET_h2s (&pr->query),
1903 if (GNUNET_YES == no_route)
1905 bm |= GET_MESSAGE_BIT_RETURN_TO;
1908 if (pr->namespace != NULL)
1910 bm |= GET_MESSAGE_BIT_SKS_NAMESPACE;
1913 if (pr->target_pid != 0)
1915 bm |= GET_MESSAGE_BIT_TRANSMIT_TO;
1918 msize = sizeof (struct GetMessage) + pr->bf_size + k * sizeof(GNUNET_HashCode);
1919 GNUNET_assert (msize < GNUNET_SERVER_MAX_MESSAGE_SIZE);
1920 pm = GNUNET_malloc (sizeof (struct PendingMessage) + msize);
1922 gm = (struct GetMessage*) &pm[1];
1923 gm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_GET);
1924 gm->header.size = htons (msize);
1925 gm->type = htonl (pr->type);
1926 pr->remaining_priority /= 2;
1927 gm->priority = htonl (pr->remaining_priority);
1928 gm->ttl = htonl (pr->ttl);
1929 gm->filter_mutator = htonl(pr->mingle);
1930 gm->hash_bitmap = htonl (bm);
1931 gm->query = pr->query;
1932 ext = (GNUNET_HashCode*) &gm[1];
1934 if (GNUNET_YES == no_route)
1935 GNUNET_PEER_resolve (pr->cp->pid, (struct GNUNET_PeerIdentity*) &ext[k++]);
1936 if (pr->namespace != NULL)
1937 memcpy (&ext[k++], pr->namespace, sizeof (GNUNET_HashCode));
1938 if (pr->target_pid != 0)
1939 GNUNET_PEER_resolve (pr->target_pid, (struct GNUNET_PeerIdentity*) &ext[k++]);
1940 bfdata = (char *) &ext[k];
1942 GNUNET_CONTAINER_bloomfilter_get_raw_data (pr->bf,
1945 pm->cont = &transmit_query_continuation;
1947 add_to_pending_messages_for_peer (cp, pm, pr);
1952 * Closure used for "target_peer_select_cb".
1954 struct PeerSelectionContext
1957 * The request for which we are selecting
1960 struct PendingRequest *pr;
1963 * Current "prime" target.
1965 struct GNUNET_PeerIdentity target;
1968 * How much do we like this target?
1970 double target_score;
1976 * Function called for each connected peer to determine
1977 * which one(s) would make good targets for forwarding.
1979 * @param cls closure (struct PeerSelectionContext)
1980 * @param key current key code (peer identity)
1981 * @param value value in the hash map (struct ConnectedPeer)
1982 * @return GNUNET_YES if we should continue to
1987 target_peer_select_cb (void *cls,
1988 const GNUNET_HashCode * key,
1991 struct PeerSelectionContext *psc = cls;
1992 struct ConnectedPeer *cp = value;
1993 struct PendingRequest *pr = psc->pr;
1998 /* 1) check that this peer is not the initiator */
2000 return GNUNET_YES; /* skip */
2002 /* 2) check if we have already (recently) forwarded to this peer */
2004 for (i=0;i<pr->used_pids_off;i++)
2005 if (pr->used_pids[i] == cp->pid)
2008 if (0 != GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2009 RETRY_PROBABILITY_INV))
2012 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2013 "NOT re-trying query that was previously transmitted %u times\n",
2014 (unsigned int) pr->used_pids_off);
2016 return GNUNET_YES; /* skip */
2021 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2022 "Re-trying query that was previously transmitted %u times to this peer\n",
2025 // 3) calculate how much we'd like to forward to this peer
2026 score = 42; // FIXME!
2027 // FIXME: also need API to gather data on responsiveness
2028 // of this peer (we have fields for that in 'cp', but
2029 // they are never set!)
2031 /* store best-fit in closure */
2032 if (score > psc->target_score)
2034 psc->target_score = score;
2035 psc->target.hashPubKey = *key;
2042 * The priority level imposes a bound on the maximum
2043 * value for the ttl that can be requested.
2045 * @param ttl_in requested ttl
2046 * @param prio given priority
2047 * @return ttl_in if ttl_in is below the limit,
2048 * otherwise the ttl-limit for the given priority
2051 bound_ttl (int32_t ttl_in, uint32_t prio)
2053 unsigned long long allowed;
2057 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
2058 if (ttl_in > allowed)
2060 if (allowed >= (1 << 30))
2069 * We're processing a GET request from another peer and have decided
2070 * to forward it to other peers. This function is called periodically
2071 * and should forward the request to other peers until we have all
2072 * possible replies. If we have transmitted the *only* reply to
2073 * the initiator we should destroy the pending request. If we have
2074 * many replies in the queue to the initiator, we should delay sending
2075 * out more queries until the reply queue has shrunk some.
2077 * @param cls our "struct ProcessGetContext *"
2081 forward_request_task (void *cls,
2082 const struct GNUNET_SCHEDULER_TaskContext *tc)
2084 struct PendingRequest *pr = cls;
2085 struct PeerSelectionContext psc;
2086 struct ConnectedPeer *cp;
2087 struct GNUNET_TIME_Relative delay;
2089 pr->task = GNUNET_SCHEDULER_NO_TASK;
2090 if (pr->irc != NULL)
2093 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2094 "Forwarding of query `%s' not attempted due to pending local lookup!\n",
2095 GNUNET_h2s (&pr->query));
2097 return; /* already pending */
2099 if (GNUNET_YES == pr->local_only)
2100 return; /* configured to not do P2P search */
2101 /* (1) select target */
2103 psc.target_score = DBL_MIN;
2104 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
2105 &target_peer_select_cb,
2107 if (psc.target_score == DBL_MIN)
2109 delay = get_processing_delay ();
2111 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2112 "No peer selected for forwarding of query `%s', will try again in %llu ms!\n",
2113 GNUNET_h2s (&pr->query),
2116 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
2118 &forward_request_task,
2120 return; /* nobody selected */
2122 /* (3) update TTL/priority */
2124 if (pr->client_request_list != NULL)
2126 /* FIXME: use better algorithm!? */
2127 if (0 == GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2130 /* FIXME: bound priority by "customary" priority used by other peers
2132 pr->ttl = bound_ttl (pr->ttl + TTL_DECREMENT * 2,
2135 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2136 "Trying query `%s' with priority %u and TTL %d.\n",
2137 GNUNET_h2s (&pr->query),
2144 /* FIXME: should we do something here as well!? */
2147 /* (3) reserve reply bandwidth */
2148 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
2149 &psc.target.hashPubKey);
2150 GNUNET_assert (NULL != cp);
2151 pr->irc = GNUNET_CORE_peer_change_preference (sched, cfg,
2153 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
2154 GNUNET_BANDWIDTH_value_init (UINT32_MAX),
2156 (uint64_t) cp->inc_preference,
2157 &target_reservation_cb,
2159 cp->inc_preference = 0.0;
2163 /* **************************** P2P PUT Handling ************************ */
2167 * Function called after we either failed or succeeded
2168 * at transmitting a reply to a peer.
2170 * @param cls the requests "struct PendingRequest*"
2171 * @param tpid ID of receiving peer, 0 on transmission error
2174 transmit_reply_continuation (void *cls,
2175 GNUNET_PEER_Id tpid)
2177 struct PendingRequest *pr = cls;
2181 case GNUNET_BLOCK_TYPE_DBLOCK:
2182 case GNUNET_BLOCK_TYPE_IBLOCK:
2183 /* only one reply expected, done with the request! */
2184 destroy_pending_request (pr);
2186 case GNUNET_BLOCK_TYPE_ANY:
2187 case GNUNET_BLOCK_TYPE_KBLOCK:
2188 case GNUNET_BLOCK_TYPE_SBLOCK:
2198 * Transmit the given message by copying it to the target buffer
2199 * "buf". "buf" will be NULL and "size" zero if the socket was closed
2200 * for writing in the meantime. In that case, do nothing
2201 * (the disconnect or shutdown handler will take care of the rest).
2202 * If we were able to transmit messages and there are still more
2203 * pending, ask core again for further calls to this function.
2205 * @param cls closure, pointer to the 'struct ClientList*'
2206 * @param size number of bytes available in buf
2207 * @param buf where the callee should write the message
2208 * @return number of bytes written to buf
2211 transmit_to_client (void *cls,
2212 size_t size, void *buf)
2214 struct ClientList *cl = cls;
2216 struct ClientResponseMessage *creply;
2223 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2224 "Not sending reply, client communication problem.\n");
2229 while ( (NULL != (creply = cl->res_head) ) &&
2230 (creply->msize <= size) )
2232 memcpy (&cbuf[msize], &creply[1], creply->msize);
2233 msize += creply->msize;
2234 size -= creply->msize;
2235 GNUNET_CONTAINER_DLL_remove (cl->res_head,
2238 GNUNET_free (creply);
2241 cl->th = GNUNET_SERVER_notify_transmit_ready (cl->client,
2243 GNUNET_TIME_UNIT_FOREVER_REL,
2244 &transmit_to_client,
2247 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2248 "Transmitted %u bytes to client\n",
2249 (unsigned int) msize);
2256 * Closure for "process_reply" function.
2258 struct ProcessReplyClosure
2261 * The data for the reply.
2266 * Who gave us this reply? NULL for local host.
2268 struct ConnectedPeer *sender;
2271 * When the reply expires.
2273 struct GNUNET_TIME_Absolute expiration;
2281 * Namespace that this reply belongs to
2282 * (if it is of type SBLOCK).
2284 GNUNET_HashCode namespace;
2287 * Type of the block.
2289 enum GNUNET_BLOCK_Type type;
2292 * How much was this reply worth to us?
2297 * Did we finish processing the associated request?
2304 * We have received a reply; handle it!
2306 * @param cls response (struct ProcessReplyClosure)
2307 * @param key our query
2308 * @param value value in the hash map (info about the query)
2309 * @return GNUNET_YES (we should continue to iterate)
2312 process_reply (void *cls,
2313 const GNUNET_HashCode * key,
2316 struct ProcessReplyClosure *prq = cls;
2317 struct PendingRequest *pr = value;
2318 struct PendingMessage *reply;
2319 struct ClientResponseMessage *creply;
2320 struct ClientList *cl;
2321 struct PutMessage *pm;
2322 struct ConnectedPeer *cp;
2323 struct GNUNET_TIME_Relative cur_delay;
2324 GNUNET_HashCode chash;
2325 GNUNET_HashCode mhash;
2329 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2330 "Matched result (type %u) for query `%s' with pending request\n",
2331 (unsigned int) prq->type,
2334 GNUNET_STATISTICS_update (stats,
2335 gettext_noop ("# replies received and matched"),
2338 if (prq->sender != NULL)
2340 /* FIXME: should we be more precise here and not use
2341 "start_time" but a peer-specific time stamp? */
2342 cur_delay = GNUNET_TIME_absolute_get_duration (pr->start_time);
2343 prq->sender->avg_delay.value
2344 = (prq->sender->avg_delay.value *
2345 (RUNAVG_DELAY_N - 1) + cur_delay.value) / RUNAVG_DELAY_N;
2346 prq->sender->avg_priority
2347 = (prq->sender->avg_priority *
2348 (RUNAVG_DELAY_N - 1) + pr->priority) / (double) RUNAVG_DELAY_N;
2351 GNUNET_PEER_change_rc (prq->sender->last_p2p_replies
2352 [prq->sender->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE],
2354 GNUNET_PEER_change_rc (pr->cp->pid, 1);
2355 prq->sender->last_p2p_replies
2356 [(prq->sender->last_p2p_replies_woff++) % P2P_SUCCESS_LIST_SIZE]
2361 if (NULL != prq->sender->last_client_replies
2362 [(prq->sender->last_client_replies_woff) % CS2P_SUCCESS_LIST_SIZE])
2363 GNUNET_SERVER_client_drop (prq->sender->last_client_replies
2364 [(prq->sender->last_client_replies_woff) % CS2P_SUCCESS_LIST_SIZE]);
2365 prq->sender->last_client_replies
2366 [(prq->sender->last_client_replies_woff++) % CS2P_SUCCESS_LIST_SIZE]
2367 = pr->client_request_list->client_list->client;
2368 GNUNET_SERVER_client_keep (pr->client_request_list->client_list->client);
2371 GNUNET_CRYPTO_hash (prq->data,
2376 case GNUNET_BLOCK_TYPE_DBLOCK:
2377 case GNUNET_BLOCK_TYPE_IBLOCK:
2378 /* only possible reply, stop requesting! */
2379 while (NULL != pr->pending_head)
2380 destroy_pending_message_list_entry (pr->pending_head);
2383 if (pr->client_request_list != NULL)
2384 GNUNET_SERVER_receive_done (pr->client_request_list->client_list->client,
2386 GNUNET_DATASTORE_cancel (pr->qe);
2389 pr->do_remove = GNUNET_YES;
2390 if (pr->task != GNUNET_SCHEDULER_NO_TASK)
2392 GNUNET_SCHEDULER_cancel (sched,
2394 pr->task = GNUNET_SCHEDULER_NO_TASK;
2396 GNUNET_break (GNUNET_YES ==
2397 GNUNET_CONTAINER_multihashmap_remove (query_request_map,
2401 case GNUNET_BLOCK_TYPE_SBLOCK:
2402 if (pr->namespace == NULL)
2407 if (0 != memcmp (pr->namespace,
2409 sizeof (GNUNET_HashCode)))
2411 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2412 _("Reply mismatched in terms of namespace. Discarded.\n"));
2413 return GNUNET_YES; /* wrong namespace */
2415 /* then: fall-through! */
2416 case GNUNET_BLOCK_TYPE_KBLOCK:
2417 case GNUNET_BLOCK_TYPE_NBLOCK:
2420 mingle_hash (&chash, pr->mingle, &mhash);
2421 if (GNUNET_YES == GNUNET_CONTAINER_bloomfilter_test (pr->bf,
2424 GNUNET_STATISTICS_update (stats,
2425 gettext_noop ("# duplicate replies discarded (bloomfilter)"),
2429 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2430 "Duplicate response `%s', discarding.\n",
2431 GNUNET_h2s (&mhash));
2433 return GNUNET_YES; /* duplicate */
2436 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2437 "New response `%s', adding to filter.\n",
2438 GNUNET_h2s (&mhash));
2441 if (pr->client_request_list != NULL)
2443 if (pr->replies_seen_size == pr->replies_seen_off)
2444 GNUNET_array_grow (pr->replies_seen,
2445 pr->replies_seen_size,
2446 pr->replies_seen_size * 2 + 4);
2447 pr->replies_seen[pr->replies_seen_off++] = chash;
2449 if ( (pr->bf == NULL) ||
2450 (pr->client_request_list != NULL) )
2451 refresh_bloomfilter (pr);
2452 GNUNET_CONTAINER_bloomfilter_add (pr->bf,
2459 prq->priority += pr->remaining_priority;
2460 pr->remaining_priority = 0;
2461 if (NULL != pr->client_request_list)
2463 GNUNET_STATISTICS_update (stats,
2464 gettext_noop ("# replies received for local clients"),
2467 cl = pr->client_request_list->client_list;
2468 msize = sizeof (struct PutMessage) + prq->size;
2469 creply = GNUNET_malloc (msize + sizeof (struct ClientResponseMessage));
2470 creply->msize = msize;
2471 creply->client_list = cl;
2472 GNUNET_CONTAINER_DLL_insert_after (cl->res_head,
2476 pm = (struct PutMessage*) &creply[1];
2477 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
2478 pm->header.size = htons (msize);
2479 pm->type = htonl (prq->type);
2480 pm->expiration = GNUNET_TIME_absolute_hton (prq->expiration);
2481 memcpy (&pm[1], prq->data, prq->size);
2485 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2486 "Transmitting result for query `%s' to client\n",
2489 cl->th = GNUNET_SERVER_notify_transmit_ready (cl->client,
2491 GNUNET_TIME_UNIT_FOREVER_REL,
2492 &transmit_to_client,
2495 GNUNET_break (cl->th != NULL);
2498 prq->finished = GNUNET_YES;
2499 destroy_pending_request (pr);
2506 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2507 "Transmitting result for query `%s' to other peer (PID=%u)\n",
2509 (unsigned int) cp->pid);
2511 GNUNET_STATISTICS_update (stats,
2512 gettext_noop ("# replies received for other peers"),
2515 msize = sizeof (struct PutMessage) + prq->size;
2516 reply = GNUNET_malloc (msize + sizeof (struct PendingMessage));
2517 reply->cont = &transmit_reply_continuation;
2518 reply->cont_cls = pr;
2519 reply->msize = msize;
2520 reply->priority = UINT32_MAX; /* send replies first! */
2521 pm = (struct PutMessage*) &reply[1];
2522 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
2523 pm->header.size = htons (msize);
2524 pm->type = htonl (prq->type);
2525 pm->expiration = GNUNET_TIME_absolute_hton (prq->expiration);
2526 memcpy (&pm[1], prq->data, prq->size);
2527 add_to_pending_messages_for_peer (cp, reply, pr);
2534 * Continuation called to notify client about result of the
2537 * @param cls closure
2538 * @param success GNUNET_SYSERR on failure
2539 * @param msg NULL on success, otherwise an error message
2542 put_migration_continuation (void *cls,
2551 * Handle P2P "PUT" message.
2553 * @param cls closure, always NULL
2554 * @param other the other peer involved (sender or receiver, NULL
2555 * for loopback messages where we are both sender and receiver)
2556 * @param message the actual message
2557 * @param latency reported latency of the connection with 'other'
2558 * @param distance reported distance (DV) to 'other'
2559 * @return GNUNET_OK to keep the connection open,
2560 * GNUNET_SYSERR to close it (signal serious error)
2563 handle_p2p_put (void *cls,
2564 const struct GNUNET_PeerIdentity *other,
2565 const struct GNUNET_MessageHeader *message,
2566 struct GNUNET_TIME_Relative latency,
2569 const struct PutMessage *put;
2572 enum GNUNET_BLOCK_Type type;
2573 struct GNUNET_TIME_Absolute expiration;
2574 GNUNET_HashCode query;
2575 struct ProcessReplyClosure prq;
2576 const struct SBlock *sb;
2578 msize = ntohs (message->size);
2579 if (msize < sizeof (struct PutMessage))
2582 return GNUNET_SYSERR;
2584 put = (const struct PutMessage*) message;
2585 dsize = msize - sizeof (struct PutMessage);
2586 type = ntohl (put->type);
2587 expiration = GNUNET_TIME_absolute_ntoh (put->expiration);
2590 GNUNET_BLOCK_check_block (type,
2595 GNUNET_break_op (0);
2596 return GNUNET_SYSERR;
2598 if (type == GNUNET_BLOCK_TYPE_ONDEMAND)
2599 return GNUNET_SYSERR;
2600 if (GNUNET_BLOCK_TYPE_SBLOCK == type)
2602 sb = (const struct SBlock*) &put[1];
2603 GNUNET_CRYPTO_hash (&sb->subspace,
2604 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2609 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2610 "Received result for query `%s' from peer `%4s'\n",
2611 GNUNET_h2s (&query),
2612 GNUNET_i2s (other));
2614 GNUNET_STATISTICS_update (stats,
2615 gettext_noop ("# replies received (overall)"),
2618 /* now, lookup 'query' */
2619 prq.data = (const void*) &put[1];
2621 prq.sender = GNUNET_CONTAINER_multihashmap_get (connected_peers,
2622 &other->hashPubKey);
2625 prq.expiration = expiration;
2627 prq.finished = GNUNET_NO;
2628 GNUNET_CONTAINER_multihashmap_get_multiple (query_request_map,
2632 if (GNUNET_YES == active_migration)
2635 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2636 "Replicating result for query `%s' with priority %u\n",
2637 GNUNET_h2s (&query),
2640 GNUNET_DATASTORE_put (dsh,
2641 0, &query, dsize, &put[1],
2642 type, prq.priority, 1 /* anonymity */,
2644 1 + prq.priority, MAX_DATASTORE_QUEUE,
2645 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
2646 &put_migration_continuation,
2653 /* **************************** P2P GET Handling ************************ */
2657 * Closure for 'check_duplicate_request_{peer,client}'.
2659 struct CheckDuplicateRequestClosure
2662 * The new request we should check if it already exists.
2664 const struct PendingRequest *pr;
2667 * Existing request found by the checker, NULL if none.
2669 struct PendingRequest *have;
2674 * Iterator over entries in the 'query_request_map' that
2675 * tries to see if we have the same request pending from
2676 * the same client already.
2678 * @param cls closure (our 'struct CheckDuplicateRequestClosure')
2679 * @param key current key code (query, ignored, must match)
2680 * @param value value in the hash map (a 'struct PendingRequest'
2681 * that already exists)
2682 * @return GNUNET_YES if we should continue to
2683 * iterate (no match yet)
2684 * GNUNET_NO if not (match found).
2687 check_duplicate_request_client (void *cls,
2688 const GNUNET_HashCode * key,
2691 struct CheckDuplicateRequestClosure *cdc = cls;
2692 struct PendingRequest *have = value;
2694 if (have->client_request_list == NULL)
2696 if ( (cdc->pr->client_request_list->client_list->client == have->client_request_list->client_list->client) &&
2707 * We're processing (local) results for a search request
2708 * from another peer. Pass applicable results to the
2709 * peer and if we are done either clean up (operation
2710 * complete) or forward to other peers (more results possible).
2712 * @param cls our closure (struct LocalGetContext)
2713 * @param key key for the content
2714 * @param size number of bytes in data
2715 * @param data content stored
2716 * @param type type of the content
2717 * @param priority priority of the content
2718 * @param anonymity anonymity-level for the content
2719 * @param expiration expiration time for the content
2720 * @param uid unique identifier for the datum;
2721 * maybe 0 if no unique identifier is available
2724 process_local_reply (void *cls,
2725 const GNUNET_HashCode * key,
2728 enum GNUNET_BLOCK_Type type,
2731 struct GNUNET_TIME_Absolute
2735 struct PendingRequest *pr = cls;
2736 struct ProcessReplyClosure prq;
2737 struct CheckDuplicateRequestClosure cdrc;
2738 const struct SBlock *sb;
2739 GNUNET_HashCode dhash;
2740 GNUNET_HashCode mhash;
2741 GNUNET_HashCode query;
2746 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2747 "Done processing local replies, forwarding request to other peers.\n");
2750 if (pr->client_request_list != NULL)
2752 GNUNET_SERVER_receive_done (pr->client_request_list->client_list->client,
2754 /* Figure out if this is a duplicate request and possibly
2755 merge 'struct PendingRequest' entries */
2758 GNUNET_CONTAINER_multihashmap_get_multiple (query_request_map,
2760 &check_duplicate_request_client,
2762 if (cdrc.have != NULL)
2765 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2766 "Received request for block `%s' twice from client, will only request once.\n",
2767 GNUNET_h2s (&pr->query));
2770 destroy_pending_request (pr);
2775 /* no more results */
2776 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
2777 pr->task = GNUNET_SCHEDULER_add_now (sched,
2778 &forward_request_task,
2783 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2784 "New local response to `%s' of type %u.\n",
2788 if (type == GNUNET_BLOCK_TYPE_ONDEMAND)
2791 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2792 "Found ONDEMAND block, performing on-demand encoding\n");
2794 GNUNET_STATISTICS_update (stats,
2795 gettext_noop ("# on-demand blocks matched requests"),
2799 GNUNET_FS_handle_on_demand_block (key, size, data, type, priority,
2800 anonymity, expiration, uid,
2801 &process_local_reply,
2804 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
2807 /* check for duplicates */
2808 GNUNET_CRYPTO_hash (data, size, &dhash);
2809 mingle_hash (&dhash,
2812 if ( (pr->bf != NULL) &&
2814 GNUNET_CONTAINER_bloomfilter_test (pr->bf,
2818 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2819 "Result from datastore filtered by bloomfilter (duplicate).\n");
2821 GNUNET_STATISTICS_update (stats,
2822 gettext_noop ("# results filtered by query bloomfilter"),
2826 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
2830 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2831 "Found result for query `%s' in local datastore\n",
2834 GNUNET_STATISTICS_update (stats,
2835 gettext_noop ("# results found locally"),
2838 pr->results_found++;
2839 memset (&prq, 0, sizeof (prq));
2841 prq.expiration = expiration;
2843 if (GNUNET_BLOCK_TYPE_SBLOCK == type)
2845 sb = (const struct SBlock*) data;
2846 GNUNET_CRYPTO_hash (&sb->subspace,
2847 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2850 if (GNUNET_OK != GNUNET_BLOCK_check_block (type,
2856 GNUNET_DATASTORE_remove (dsh,
2860 GNUNET_TIME_UNIT_FOREVER_REL,
2862 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
2866 prq.priority = priority;
2867 prq.finished = GNUNET_NO;
2868 process_reply (&prq, key, pr);
2869 if (prq.finished == GNUNET_YES)
2872 return; /* done here */
2873 if ( (type == GNUNET_BLOCK_TYPE_DBLOCK) ||
2874 (type == GNUNET_BLOCK_TYPE_IBLOCK) )
2876 GNUNET_DATASTORE_get_next (dsh, GNUNET_NO);
2879 if ( (pr->client_request_list == NULL) &&
2880 ( (GNUNET_YES == test_load_too_high()) ||
2881 (pr->results_found > 5 + 2 * pr->priority) ) )
2884 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2885 "Load too high, done with request\n");
2887 GNUNET_STATISTICS_update (stats,
2888 gettext_noop ("# processing result set cut short due to load"),
2891 GNUNET_DATASTORE_get_next (dsh, GNUNET_NO);
2894 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
2899 * We've received a request with the specified priority. Bound it
2900 * according to how much we trust the given peer.
2902 * @param prio_in requested priority
2903 * @param cp the peer making the request
2904 * @return effective priority
2907 bound_priority (uint32_t prio_in,
2908 struct ConnectedPeer *cp)
2915 * Iterator over entries in the 'query_request_map' that
2916 * tries to see if we have the same request pending from
2917 * the same peer already.
2919 * @param cls closure (our 'struct CheckDuplicateRequestClosure')
2920 * @param key current key code (query, ignored, must match)
2921 * @param value value in the hash map (a 'struct PendingRequest'
2922 * that already exists)
2923 * @return GNUNET_YES if we should continue to
2924 * iterate (no match yet)
2925 * GNUNET_NO if not (match found).
2928 check_duplicate_request_peer (void *cls,
2929 const GNUNET_HashCode * key,
2932 struct CheckDuplicateRequestClosure *cdc = cls;
2933 struct PendingRequest *have = value;
2935 if (cdc->pr->target_pid == have->target_pid)
2945 * Handle P2P "GET" request.
2947 * @param cls closure, always NULL
2948 * @param other the other peer involved (sender or receiver, NULL
2949 * for loopback messages where we are both sender and receiver)
2950 * @param message the actual message
2951 * @param latency reported latency of the connection with 'other'
2952 * @param distance reported distance (DV) to 'other'
2953 * @return GNUNET_OK to keep the connection open,
2954 * GNUNET_SYSERR to close it (signal serious error)
2957 handle_p2p_get (void *cls,
2958 const struct GNUNET_PeerIdentity *other,
2959 const struct GNUNET_MessageHeader *message,
2960 struct GNUNET_TIME_Relative latency,
2963 struct PendingRequest *pr;
2964 struct ConnectedPeer *cp;
2965 struct ConnectedPeer *cps;
2966 struct CheckDuplicateRequestClosure cdc;
2967 struct GNUNET_TIME_Relative timeout;
2969 const struct GetMessage *gm;
2971 const GNUNET_HashCode *opt;
2974 uint32_t ttl_decrement;
2975 enum GNUNET_BLOCK_Type type;
2979 msize = ntohs(message->size);
2980 if (msize < sizeof (struct GetMessage))
2982 GNUNET_break_op (0);
2983 return GNUNET_SYSERR;
2985 gm = (const struct GetMessage*) message;
2986 type = ntohl (gm->type);
2989 case GNUNET_BLOCK_TYPE_ANY:
2990 case GNUNET_BLOCK_TYPE_DBLOCK:
2991 case GNUNET_BLOCK_TYPE_IBLOCK:
2992 case GNUNET_BLOCK_TYPE_KBLOCK:
2993 case GNUNET_BLOCK_TYPE_SBLOCK:
2996 GNUNET_break_op (0);
2997 return GNUNET_SYSERR;
2999 bm = ntohl (gm->hash_bitmap);
3007 if (msize < sizeof (struct GetMessage) + bits * sizeof (GNUNET_HashCode))
3009 GNUNET_break_op (0);
3010 return GNUNET_SYSERR;
3012 opt = (const GNUNET_HashCode*) &gm[1];
3013 bfsize = msize - sizeof (struct GetMessage) + bits * sizeof (GNUNET_HashCode);
3014 bm = ntohl (gm->hash_bitmap);
3015 if ( (0 != (bm & GET_MESSAGE_BIT_SKS_NAMESPACE)) &&
3016 (type != GNUNET_BLOCK_TYPE_SBLOCK) )
3018 GNUNET_break_op (0);
3019 return GNUNET_SYSERR;
3022 cps = GNUNET_CONTAINER_multihashmap_get (connected_peers,
3023 &other->hashPubKey);
3026 /* peer must have just disconnected */
3027 GNUNET_STATISTICS_update (stats,
3028 gettext_noop ("# requests dropped due to initiator not being connected"),
3031 return GNUNET_SYSERR;
3033 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
3034 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
3041 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
3042 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3043 "Failed to find RETURN-TO peer `%4s' in connection set. Dropping query.\n",
3044 GNUNET_i2s ((const struct GNUNET_PeerIdentity*) &opt[bits-1]));
3047 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3048 "Failed to find peer `%4s' in connection set. Dropping query.\n",
3049 GNUNET_i2s (other));
3051 GNUNET_STATISTICS_update (stats,
3052 gettext_noop ("# requests dropped due to missing reverse route"),
3055 /* FIXME: try connect? */
3058 /* note that we can really only check load here since otherwise
3059 peers could find out that we are overloaded by not being
3060 disconnected after sending us a malformed query... */
3061 if (GNUNET_YES == test_load_too_high ())
3064 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3065 "Dropping query from `%s', this peer is too busy.\n",
3066 GNUNET_i2s (other));
3068 GNUNET_STATISTICS_update (stats,
3069 gettext_noop ("# requests dropped due to high load"),
3076 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3077 "Received request for `%s' of type %u from peer `%4s' with flags %u\n",
3078 GNUNET_h2s (&gm->query),
3079 (unsigned int) type,
3083 have_ns = (0 != (bm & GET_MESSAGE_BIT_SKS_NAMESPACE));
3084 pr = GNUNET_malloc (sizeof (struct PendingRequest) +
3085 (have_ns ? sizeof(GNUNET_HashCode) : 0));
3087 pr->namespace = (GNUNET_HashCode*) &pr[1];
3089 pr->mingle = ntohl (gm->filter_mutator);
3090 if (0 != (bm & GET_MESSAGE_BIT_SKS_NAMESPACE))
3091 memcpy (&pr[1], &opt[bits++], sizeof (GNUNET_HashCode));
3092 if (0 != (bm & GET_MESSAGE_BIT_TRANSMIT_TO))
3093 pr->target_pid = GNUNET_PEER_intern ((const struct GNUNET_PeerIdentity*) &opt[bits++]);
3095 pr->anonymity_level = 1;
3096 pr->priority = bound_priority (ntohl (gm->priority), cps);
3097 pr->ttl = bound_ttl (ntohl (gm->ttl), pr->priority);
3098 pr->query = gm->query;
3099 /* decrement ttl (always) */
3100 ttl_decrement = 2 * TTL_DECREMENT +
3101 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3103 if ( (pr->ttl < 0) &&
3104 (((int32_t)(pr->ttl - ttl_decrement)) > 0) )
3107 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3108 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
3113 GNUNET_STATISTICS_update (stats,
3114 gettext_noop ("# requests dropped due TTL underflow"),
3117 /* integer underflow => drop (should be very rare)! */
3121 pr->ttl -= ttl_decrement;
3122 pr->start_time = GNUNET_TIME_absolute_get ();
3124 /* get bloom filter */
3127 pr->bf = GNUNET_CONTAINER_bloomfilter_init ((const char*) &opt[bits],
3130 pr->bf_size = bfsize;
3135 GNUNET_CONTAINER_multihashmap_get_multiple (query_request_map,
3137 &check_duplicate_request_peer,
3139 if (cdc.have != NULL)
3141 if (cdc.have->start_time.value + cdc.have->ttl >=
3142 pr->start_time.value + pr->ttl)
3144 /* existing request has higher TTL, drop new one! */
3145 cdc.have->priority += pr->priority;
3146 destroy_pending_request (pr);
3148 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3149 "Have existing request with higher TTL, dropping new request.\n",
3150 GNUNET_i2s (other));
3152 GNUNET_STATISTICS_update (stats,
3153 gettext_noop ("# requests dropped due to higher-TTL request"),
3160 /* existing request has lower TTL, drop old one! */
3161 pr->priority += cdc.have->priority;
3162 /* Possible optimization: if we have applicable pending
3163 replies in 'cdc.have', we might want to move those over
3164 (this is a really rare special-case, so it is not clear
3165 that this would be worth it) */
3166 destroy_pending_request (cdc.have);
3167 /* keep processing 'pr'! */
3172 GNUNET_break (GNUNET_OK ==
3173 GNUNET_CONTAINER_multihashmap_put (query_request_map,
3176 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
3177 GNUNET_break (GNUNET_OK ==
3178 GNUNET_CONTAINER_multihashmap_put (peer_request_map,
3181 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
3183 pr->hnode = GNUNET_CONTAINER_heap_insert (requests_by_expiration_heap,
3185 pr->start_time.value + pr->ttl);
3187 GNUNET_STATISTICS_update (stats,
3188 gettext_noop ("# P2P searches received"),
3191 GNUNET_STATISTICS_update (stats,
3192 gettext_noop ("# P2P searches active"),
3196 /* calculate change in traffic preference */
3197 preference = (double) pr->priority;
3198 if (preference < QUERY_BANDWIDTH_VALUE)
3199 preference = QUERY_BANDWIDTH_VALUE;
3200 cps->inc_preference += preference;
3202 /* process locally */
3203 if (type == GNUNET_BLOCK_TYPE_DBLOCK)
3204 type = GNUNET_BLOCK_TYPE_ANY; /* to get on-demand as well */
3205 timeout = GNUNET_TIME_relative_multiply (BASIC_DATASTORE_REQUEST_DELAY,
3206 (pr->priority + 1));
3207 pr->qe = GNUNET_DATASTORE_get (dsh,
3211 MAX_DATASTORE_QUEUE,
3213 &process_local_reply,
3216 /* Are multiple results possible? If so, start processing remotely now! */
3219 case GNUNET_BLOCK_TYPE_DBLOCK:
3220 case GNUNET_BLOCK_TYPE_IBLOCK:
3221 /* only one result, wait for datastore */
3224 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
3225 pr->task = GNUNET_SCHEDULER_add_now (sched,
3226 &forward_request_task,
3230 /* make sure we don't track too many requests */
3231 if (GNUNET_CONTAINER_heap_get_size (requests_by_expiration_heap) > max_pending_requests)
3233 pr = GNUNET_CONTAINER_heap_peek (requests_by_expiration_heap);
3234 destroy_pending_request (pr);
3240 /* **************************** CS GET Handling ************************ */
3244 * Handle START_SEARCH-message (search request from client).
3246 * @param cls closure
3247 * @param client identification of the client
3248 * @param message the actual message
3251 handle_start_search (void *cls,
3252 struct GNUNET_SERVER_Client *client,
3253 const struct GNUNET_MessageHeader *message)
3255 static GNUNET_HashCode all_zeros;
3256 const struct SearchMessage *sm;
3257 struct ClientList *cl;
3258 struct ClientRequestList *crl;
3259 struct PendingRequest *pr;
3262 enum GNUNET_BLOCK_Type type;
3264 msize = ntohs (message->size);
3265 if ( (msize < sizeof (struct SearchMessage)) ||
3266 (0 != (msize - sizeof (struct SearchMessage)) % sizeof (GNUNET_HashCode)) )
3269 GNUNET_SERVER_receive_done (client,
3273 GNUNET_STATISTICS_update (stats,
3274 gettext_noop ("# client searches received"),
3277 sc = (msize - sizeof (struct SearchMessage)) / sizeof (GNUNET_HashCode);
3278 sm = (const struct SearchMessage*) message;
3279 type = ntohl (sm->type);
3281 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3282 "Received request for `%s' of type %u from local client\n",
3283 GNUNET_h2s (&sm->query),
3284 (unsigned int) type);
3288 case GNUNET_BLOCK_TYPE_ANY:
3289 case GNUNET_BLOCK_TYPE_DBLOCK:
3290 case GNUNET_BLOCK_TYPE_IBLOCK:
3291 case GNUNET_BLOCK_TYPE_KBLOCK:
3292 case GNUNET_BLOCK_TYPE_SBLOCK:
3293 case GNUNET_BLOCK_TYPE_NBLOCK:
3297 GNUNET_SERVER_receive_done (client,
3303 while ( (cl != NULL) &&
3304 (cl->client != client) )
3308 cl = GNUNET_malloc (sizeof (struct ClientList));
3309 cl->client = client;
3310 GNUNET_SERVER_client_keep (client);
3311 cl->next = client_list;
3314 /* detect duplicate KBLOCK requests */
3315 if ( (type == GNUNET_BLOCK_TYPE_KBLOCK) ||
3316 (type == GNUNET_BLOCK_TYPE_NBLOCK) ||
3317 (type == GNUNET_BLOCK_TYPE_ANY) )
3320 while ( (crl != NULL) &&
3321 ( (0 != memcmp (&crl->req->query,
3323 sizeof (GNUNET_HashCode))) ||
3324 (crl->req->type != type) ) )
3329 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3330 "Have existing request, merging content-seen lists.\n");
3333 /* Duplicate request (used to send long list of
3334 known/blocked results); merge 'pr->replies_seen'
3335 and update bloom filter */
3336 GNUNET_array_grow (pr->replies_seen,
3337 pr->replies_seen_size,
3338 pr->replies_seen_off + sc);
3339 memcpy (&pr->replies_seen[pr->replies_seen_off],
3341 sc * sizeof (GNUNET_HashCode));
3342 pr->replies_seen_off += sc;
3343 refresh_bloomfilter (pr);
3344 GNUNET_STATISTICS_update (stats,
3345 gettext_noop ("# client searches updated (merged content seen list)"),
3348 GNUNET_SERVER_receive_done (client,
3353 GNUNET_STATISTICS_update (stats,
3354 gettext_noop ("# client searches active"),
3357 pr = GNUNET_malloc (sizeof (struct PendingRequest) +
3358 ((type == GNUNET_BLOCK_TYPE_SBLOCK) ? sizeof(GNUNET_HashCode) : 0));
3359 crl = GNUNET_malloc (sizeof (struct ClientRequestList));
3360 memset (crl, 0, sizeof (struct ClientRequestList));
3361 crl->client_list = cl;
3362 GNUNET_CONTAINER_DLL_insert (cl->rl_head,
3367 pr->client_request_list = crl;
3368 GNUNET_array_grow (pr->replies_seen,
3369 pr->replies_seen_size,
3371 memcpy (pr->replies_seen,
3373 sc * sizeof (GNUNET_HashCode));
3374 pr->replies_seen_off = sc;
3375 pr->anonymity_level = ntohl (sm->anonymity_level);
3376 refresh_bloomfilter (pr);
3377 pr->query = sm->query;
3378 if (0 == (1 & ntohl (sm->options)))
3379 pr->local_only = GNUNET_NO;
3381 pr->local_only = GNUNET_YES;
3384 case GNUNET_BLOCK_TYPE_DBLOCK:
3385 case GNUNET_BLOCK_TYPE_IBLOCK:
3386 if (0 != memcmp (&sm->target,
3388 sizeof (GNUNET_HashCode)))
3389 pr->target_pid = GNUNET_PEER_intern ((const struct GNUNET_PeerIdentity*) &sm->target);
3391 case GNUNET_BLOCK_TYPE_SBLOCK:
3392 pr->namespace = (GNUNET_HashCode*) &pr[1];
3393 memcpy (&pr[1], &sm->target, sizeof (GNUNET_HashCode));
3398 GNUNET_break (GNUNET_OK ==
3399 GNUNET_CONTAINER_multihashmap_put (query_request_map,
3402 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
3403 if (type == GNUNET_BLOCK_TYPE_DBLOCK)
3404 type = GNUNET_BLOCK_TYPE_ANY; /* get on-demand blocks too! */
3405 pr->qe = GNUNET_DATASTORE_get (dsh,
3409 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
3410 &process_local_reply,
3415 /* **************************** Startup ************************ */
3419 * List of handlers for P2P messages
3420 * that we care about.
3422 static struct GNUNET_CORE_MessageHandler p2p_handlers[] =
3425 GNUNET_MESSAGE_TYPE_FS_GET, 0 },
3427 GNUNET_MESSAGE_TYPE_FS_PUT, 0 },
3433 * List of handlers for the messages understood by this
3436 static struct GNUNET_SERVER_MessageHandler handlers[] = {
3437 {&GNUNET_FS_handle_index_start, NULL,
3438 GNUNET_MESSAGE_TYPE_FS_INDEX_START, 0},
3439 {&GNUNET_FS_handle_index_list_get, NULL,
3440 GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_GET, sizeof(struct GNUNET_MessageHeader) },
3441 {&GNUNET_FS_handle_unindex, NULL, GNUNET_MESSAGE_TYPE_FS_UNINDEX,
3442 sizeof (struct UnindexMessage) },
3443 {&handle_start_search, NULL, GNUNET_MESSAGE_TYPE_FS_START_SEARCH,
3450 * Process fs requests.
3452 * @param s scheduler to use
3453 * @param server the initialized server
3454 * @param c configuration to use
3457 main_init (struct GNUNET_SCHEDULER_Handle *s,
3458 struct GNUNET_SERVER_Handle *server,
3459 const struct GNUNET_CONFIGURATION_Handle *c)
3463 stats = GNUNET_STATISTICS_create (sched, "fs", cfg);
3464 min_migration_delay = GNUNET_TIME_UNIT_SECONDS; // FIXME: get from config
3465 connected_peers = GNUNET_CONTAINER_multihashmap_create (128); // FIXME: get size from config
3466 query_request_map = GNUNET_CONTAINER_multihashmap_create (128); // FIXME: get size from config
3467 peer_request_map = GNUNET_CONTAINER_multihashmap_create (128); // FIXME: get size from config
3468 requests_by_expiration_heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
3469 core = GNUNET_CORE_connect (sched,
3471 GNUNET_TIME_UNIT_FOREVER_REL,
3474 &peer_connect_handler,
3475 &peer_disconnect_handler,
3481 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3482 _("Failed to connect to `%s' service.\n"),
3484 GNUNET_CONTAINER_multihashmap_destroy (connected_peers);
3485 connected_peers = NULL;
3486 GNUNET_CONTAINER_multihashmap_destroy (query_request_map);
3487 query_request_map = NULL;
3488 GNUNET_CONTAINER_heap_destroy (requests_by_expiration_heap);
3489 requests_by_expiration_heap = NULL;
3490 GNUNET_CONTAINER_multihashmap_destroy (peer_request_map);
3491 peer_request_map = NULL;
3494 GNUNET_DATASTORE_disconnect (dsh, GNUNET_NO);
3497 return GNUNET_SYSERR;
3499 /* FIXME: distinguish between sending and storing in options? */
3500 if (active_migration)
3502 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3503 _("Content migration is enabled, will start to gather data\n"));
3504 consider_migration_gathering ();
3506 GNUNET_SERVER_disconnect_notify (server,
3507 &handle_client_disconnect,
3509 GNUNET_SERVER_add_handlers (server, handlers);
3510 GNUNET_SCHEDULER_add_delayed (sched,
3511 GNUNET_TIME_UNIT_FOREVER_REL,
3519 * Process fs requests.
3521 * @param cls closure
3522 * @param sched scheduler to use
3523 * @param server the initialized server
3524 * @param cfg configuration to use
3528 struct GNUNET_SCHEDULER_Handle *sched,
3529 struct GNUNET_SERVER_Handle *server,
3530 const struct GNUNET_CONFIGURATION_Handle *cfg)
3532 active_migration = GNUNET_CONFIGURATION_get_value_yesno (cfg,
3535 dsh = GNUNET_DATASTORE_connect (cfg,
3539 GNUNET_SCHEDULER_shutdown (sched);
3542 if ( (GNUNET_OK != GNUNET_FS_indexing_init (sched, cfg, dsh)) ||
3543 (GNUNET_OK != main_init (sched, server, cfg)) )
3545 GNUNET_SCHEDULER_shutdown (sched);
3546 GNUNET_DATASTORE_disconnect (dsh, GNUNET_NO);
3554 * The main function for the fs service.
3556 * @param argc number of arguments from the command line
3557 * @param argv command line arguments
3558 * @return 0 ok, 1 on error
3561 main (int argc, char *const *argv)
3563 return (GNUNET_OK ==
3564 GNUNET_SERVICE_run (argc,
3567 GNUNET_SERVICE_OPTION_NONE,
3568 &run, NULL)) ? 0 : 1;
3571 /* end of gnunet-service-fs.c */