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)2
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_CORE_notify_transmit_ready (core,
847 0, GNUNET_TIME_UNIT_FOREVER_REL,
848 (const struct GNUNET_PeerIdentity*) key,
849 msize + sizeof (struct PutMessage),
857 * Task that is run periodically to obtain blocks for content
861 * @param tc scheduler context (also unused)
864 gather_migration_blocks (void *cls,
865 const struct GNUNET_SCHEDULER_TaskContext *tc);
869 * If the migration task is not currently running, consider
870 * (re)scheduling it with the appropriate delay.
873 consider_migration_gathering ()
875 struct GNUNET_TIME_Relative delay;
879 if (mig_task != GNUNET_SCHEDULER_NO_TASK)
881 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
883 delay = GNUNET_TIME_relative_divide (GNUNET_TIME_UNIT_SECONDS,
884 MAX_MIGRATION_QUEUE);
885 delay = GNUNET_TIME_relative_max (delay,
886 min_migration_delay);
887 mig_task = GNUNET_SCHEDULER_add_delayed (sched,
889 &gather_migration_blocks,
895 * Process content offered for migration.
898 * @param key key for the content
899 * @param size number of bytes in data
900 * @param data content stored
901 * @param type type of the content
902 * @param priority priority of the content
903 * @param anonymity anonymity-level for the content
904 * @param expiration expiration time for the content
905 * @param uid unique identifier for the datum;
906 * maybe 0 if no unique identifier is available
909 process_migration_content (void *cls,
910 const GNUNET_HashCode * key,
913 enum GNUNET_BLOCK_Type type,
916 struct GNUNET_TIME_Absolute
917 expiration, uint64_t uid)
919 struct MigrationReadyBlock *mb;
924 if (mig_size < MAX_MIGRATION_QUEUE)
925 consider_migration_gathering ();
928 if (type == GNUNET_BLOCK_TYPE_ONDEMAND)
931 GNUNET_FS_handle_on_demand_block (key, size, data,
932 type, priority, anonymity,
934 &process_migration_content,
936 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
939 mb = GNUNET_malloc (sizeof (struct MigrationReadyBlock) + size);
941 mb->expiration = expiration;
944 memcpy (&mb[1], data, size);
945 GNUNET_CONTAINER_DLL_insert_after (mig_head,
950 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
953 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
958 * Task that is run periodically to obtain blocks for content
962 * @param tc scheduler context (also unused)
965 gather_migration_blocks (void *cls,
966 const struct GNUNET_SCHEDULER_TaskContext *tc)
968 mig_task = GNUNET_SCHEDULER_NO_TASK;
969 mig_qe = GNUNET_DATASTORE_get_random (dsh, 0, -1,
970 GNUNET_TIME_UNIT_FOREVER_REL,
971 &process_migration_content, NULL);
976 * We're done with a particular message list entry.
977 * Free all associated resources.
979 * @param pml entry to destroy
982 destroy_pending_message_list_entry (struct PendingMessageList *pml)
984 GNUNET_CONTAINER_DLL_remove (pml->req->pending_head,
985 pml->req->pending_tail,
987 GNUNET_CONTAINER_DLL_remove (pml->target->pending_messages_head,
988 pml->target->pending_messages_tail,
990 pml->target->pending_requests--;
991 GNUNET_free (pml->pm);
997 * Destroy the given pending message (and call the respective
1000 * @param pm message to destroy
1001 * @param tpid id of peer that the message was delivered to, or 0 for none
1004 destroy_pending_message (struct PendingMessage *pm,
1005 GNUNET_PEER_Id tpid)
1007 struct PendingMessageList *pml = pm->pml;
1008 TransmissionContinuation cont;
1011 GNUNET_assert (pml->pm == pm);
1012 GNUNET_assert ( (tpid == 0) || (tpid == pml->target->pid) );
1014 cont_cls = pm->cont_cls;
1015 destroy_pending_message_list_entry (pml);
1016 cont (cont_cls, tpid);
1021 * We're done processing a particular request.
1022 * Free all associated resources.
1024 * @param pr request to destroy
1027 destroy_pending_request (struct PendingRequest *pr)
1029 struct GNUNET_PeerIdentity pid;
1031 if (pr->hnode != NULL)
1033 GNUNET_CONTAINER_heap_remove_node (requests_by_expiration_heap,
1037 if (NULL == pr->client_request_list)
1039 GNUNET_STATISTICS_update (stats,
1040 gettext_noop ("# P2P searches active"),
1046 GNUNET_STATISTICS_update (stats,
1047 gettext_noop ("# client searches active"),
1051 /* might have already been removed from map in 'process_reply' (if
1052 there was a unique reply) or never inserted if it was a
1053 duplicate; hence ignore the return value here */
1054 (void) GNUNET_CONTAINER_multihashmap_remove (query_request_map,
1059 GNUNET_DATASTORE_cancel (pr->qe);
1062 if (pr->client_request_list != NULL)
1064 GNUNET_CONTAINER_DLL_remove (pr->client_request_list->client_list->rl_head,
1065 pr->client_request_list->client_list->rl_tail,
1066 pr->client_request_list);
1067 GNUNET_free (pr->client_request_list);
1068 pr->client_request_list = NULL;
1072 GNUNET_PEER_resolve (pr->cp->pid,
1074 (void) GNUNET_CONTAINER_multihashmap_remove (peer_request_map,
1081 GNUNET_CONTAINER_bloomfilter_free (pr->bf);
1084 if (pr->irc != NULL)
1086 GNUNET_CORE_peer_change_preference_cancel (pr->irc);
1089 if (pr->replies_seen != NULL)
1091 GNUNET_free (pr->replies_seen);
1092 pr->replies_seen = NULL;
1094 if (pr->task != GNUNET_SCHEDULER_NO_TASK)
1096 GNUNET_SCHEDULER_cancel (sched,
1098 pr->task = GNUNET_SCHEDULER_NO_TASK;
1100 while (NULL != pr->pending_head)
1101 destroy_pending_message_list_entry (pr->pending_head);
1102 GNUNET_PEER_change_rc (pr->target_pid, -1);
1103 if (pr->used_pids != NULL)
1105 GNUNET_PEER_decrement_rcs (pr->used_pids, pr->used_pids_off);
1106 GNUNET_free (pr->used_pids);
1107 pr->used_pids_off = 0;
1108 pr->used_pids_size = 0;
1109 pr->used_pids = NULL;
1116 * Method called whenever a given peer connects.
1118 * @param cls closure, not used
1119 * @param peer peer identity this notification is about
1120 * @param latency reported latency of the connection with 'other'
1121 * @param distance reported distance (DV) to 'other'
1124 peer_connect_handler (void *cls,
1126 GNUNET_PeerIdentity * peer,
1127 struct GNUNET_TIME_Relative latency,
1130 struct ConnectedPeer *cp;
1131 struct MigrationReadyBlock *pos;
1133 cp = GNUNET_malloc (sizeof (struct ConnectedPeer));
1134 cp->pid = GNUNET_PEER_intern (peer);
1135 GNUNET_break (GNUNET_OK ==
1136 GNUNET_CONTAINER_multihashmap_put (connected_peers,
1139 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1144 (void) consider_migration (pos, &peer->hashPubKey, cp);
1152 * Free (each) request made by the peer.
1154 * @param cls closure, points to peer that the request belongs to
1155 * @param key current key code
1156 * @param value value in the hash map
1157 * @return GNUNET_YES (we should continue to iterate)
1160 destroy_request (void *cls,
1161 const GNUNET_HashCode * key,
1164 const struct GNUNET_PeerIdentity * peer = cls;
1165 struct PendingRequest *pr = value;
1167 GNUNET_break (GNUNET_YES ==
1168 GNUNET_CONTAINER_multihashmap_remove (peer_request_map,
1171 destroy_pending_request (pr);
1177 * Method called whenever a peer disconnects.
1179 * @param cls closure, not used
1180 * @param peer peer identity this notification is about
1183 peer_disconnect_handler (void *cls,
1185 GNUNET_PeerIdentity * peer)
1187 struct ConnectedPeer *cp;
1188 struct PendingMessage *pm;
1190 struct MigrationReadyBlock *pos;
1191 struct MigrationReadyBlock *next;
1193 GNUNET_CONTAINER_multihashmap_get_multiple (peer_request_map,
1197 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
1201 for (i=0;i<CS2P_SUCCESS_LIST_SIZE;i++)
1203 if (NULL != cp->last_client_replies[i])
1205 GNUNET_SERVER_client_drop (cp->last_client_replies[i]);
1206 cp->last_client_replies[i] = NULL;
1209 GNUNET_break (GNUNET_YES ==
1210 GNUNET_CONTAINER_multihashmap_remove (connected_peers,
1213 /* remove this peer from migration considerations; schedule
1216 while (NULL != (pos = next))
1219 for (i=0;i<MIGRATION_LIST_SIZE;i++)
1221 if (pos->target_list[i] == cp->pid)
1223 GNUNET_PEER_change_rc (pos->target_list[i], -1);
1224 pos->target_list[i] = 0;
1225 if (pos->used_targets >= GNUNET_CONTAINER_multihashmap_size (connected_peers))
1227 delete_migration_block (pos);
1228 consider_migration_gathering ();
1230 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
1231 &consider_migration,
1238 GNUNET_PEER_change_rc (cp->pid, -1);
1239 GNUNET_PEER_decrement_rcs (cp->last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
1240 if (NULL != cp->cth)
1241 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1242 while (NULL != (pm = cp->pending_messages_head))
1243 destroy_pending_message (pm, 0 /* delivery failed */);
1244 GNUNET_break (0 == cp->pending_requests);
1250 * Iterator over hash map entries that removes all occurences
1251 * of the given 'client' from the 'last_client_replies' of the
1252 * given connected peer.
1254 * @param cls closure, the 'struct GNUNET_SERVER_Client*' to remove
1255 * @param key current key code (unused)
1256 * @param value value in the hash map (the 'struct ConnectedPeer*' to change)
1257 * @return GNUNET_YES (we should continue to iterate)
1260 remove_client_from_last_client_replies (void *cls,
1261 const GNUNET_HashCode * key,
1264 struct GNUNET_SERVER_Client *client = cls;
1265 struct ConnectedPeer *cp = value;
1268 for (i=0;i<CS2P_SUCCESS_LIST_SIZE;i++)
1270 if (cp->last_client_replies[i] == client)
1272 GNUNET_SERVER_client_drop (cp->last_client_replies[i]);
1273 cp->last_client_replies[i] = NULL;
1281 * A client disconnected. Remove all of its pending queries.
1283 * @param cls closure, NULL
1284 * @param client identification of the client
1287 handle_client_disconnect (void *cls,
1288 struct GNUNET_SERVER_Client
1291 struct ClientList *pos;
1292 struct ClientList *prev;
1293 struct ClientRequestList *rcl;
1294 struct ClientResponseMessage *creply;
1300 while ( (NULL != pos) &&
1301 (pos->client != client) )
1307 return; /* no requests pending for this client */
1308 while (NULL != (rcl = pos->rl_head))
1310 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1311 "Destroying pending request `%s' on disconnect\n",
1312 GNUNET_h2s (&rcl->req->query));
1313 destroy_pending_request (rcl->req);
1316 client_list = pos->next;
1318 prev->next = pos->next;
1319 if (pos->th != NULL)
1321 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
1324 while (NULL != (creply = pos->res_head))
1326 GNUNET_CONTAINER_DLL_remove (pos->res_head,
1329 GNUNET_free (creply);
1331 GNUNET_SERVER_client_drop (pos->client);
1333 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
1334 &remove_client_from_last_client_replies,
1340 * Iterator to free peer entries.
1342 * @param cls closure, unused
1343 * @param key current key code
1344 * @param value value in the hash map (peer entry)
1345 * @return GNUNET_YES (we should continue to iterate)
1348 clean_peer (void *cls,
1349 const GNUNET_HashCode * key,
1352 peer_disconnect_handler (NULL, (const struct GNUNET_PeerIdentity*) key);
1358 * Task run during shutdown.
1364 shutdown_task (void *cls,
1365 const struct GNUNET_SCHEDULER_TaskContext *tc)
1369 GNUNET_DATASTORE_cancel (mig_qe);
1372 if (GNUNET_SCHEDULER_NO_TASK != mig_task)
1374 GNUNET_SCHEDULER_cancel (sched, mig_task);
1375 mig_task = GNUNET_SCHEDULER_NO_TASK;
1377 while (client_list != NULL)
1378 handle_client_disconnect (NULL,
1379 client_list->client);
1380 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
1383 GNUNET_break (0 == GNUNET_CONTAINER_heap_get_size (requests_by_expiration_heap));
1384 GNUNET_CONTAINER_heap_destroy (requests_by_expiration_heap);
1385 requests_by_expiration_heap = 0;
1386 GNUNET_CONTAINER_multihashmap_destroy (connected_peers);
1387 connected_peers = NULL;
1388 GNUNET_break (0 == GNUNET_CONTAINER_multihashmap_size (query_request_map));
1389 GNUNET_CONTAINER_multihashmap_destroy (query_request_map);
1390 query_request_map = NULL;
1391 GNUNET_break (0 == GNUNET_CONTAINER_multihashmap_size (peer_request_map));
1392 GNUNET_CONTAINER_multihashmap_destroy (peer_request_map);
1393 peer_request_map = NULL;
1394 GNUNET_assert (NULL != core);
1395 GNUNET_CORE_disconnect (core);
1399 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
1402 GNUNET_DATASTORE_disconnect (dsh,
1404 while (mig_head != NULL)
1405 delete_migration_block (mig_head);
1406 GNUNET_assert (0 == mig_size);
1413 /* ******************* Utility functions ******************** */
1417 * Transmit messages by copying it to the target buffer
1418 * "buf". "buf" will be NULL and "size" zero if the socket was closed
1419 * for writing in the meantime. In that case, do nothing
1420 * (the disconnect or shutdown handler will take care of the rest).
1421 * If we were able to transmit messages and there are still more
1422 * pending, ask core again for further calls to this function.
1424 * @param cls closure, pointer to the 'struct ConnectedPeer*'
1425 * @param size number of bytes available in buf
1426 * @param buf where the callee should write the message
1427 * @return number of bytes written to buf
1430 transmit_to_peer (void *cls,
1431 size_t size, void *buf)
1433 struct ConnectedPeer *cp = cls;
1435 struct GNUNET_PeerIdentity pid;
1436 struct PendingMessage *pm;
1437 struct MigrationReadyBlock *mb;
1438 struct MigrationReadyBlock *next;
1439 struct PutMessage migm;
1447 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1448 "Dropping message, core too busy.\n");
1453 while ( (NULL != (pm = cp->pending_messages_head) ) &&
1454 (pm->msize <= size) )
1456 memcpy (&cbuf[msize], &pm[1], pm->msize);
1459 destroy_pending_message (pm, cp->pid);
1463 GNUNET_PEER_resolve (cp->pid,
1465 cp->cth = GNUNET_CORE_notify_transmit_ready (core,
1467 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
1476 while (NULL != (mb = next))
1479 for (i=0;i<MIGRATION_LIST_SIZE;i++)
1481 if ( (cp->pid == mb->target_list[i]) &&
1482 (mb->size + sizeof (migm) <= size) )
1484 GNUNET_PEER_change_rc (mb->target_list[i], -1);
1485 mb->target_list[i] = 0;
1487 migm.header.size = htons (sizeof (migm) + mb->size);
1488 migm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
1489 migm.type = htonl (mb->type);
1490 migm.expiration = GNUNET_TIME_absolute_hton (mb->expiration);
1491 memcpy (&cbuf[msize], &migm, sizeof (migm));
1492 msize += sizeof (migm);
1493 size -= sizeof (migm);
1494 memcpy (&cbuf[msize], &mb[1], mb->size);
1500 if ( (mb->used_targets >= MIGRATION_TARGET_COUNT) ||
1501 (mb->used_targets >= GNUNET_CONTAINER_multihashmap_size (connected_peers)) )
1503 delete_migration_block (mb);
1504 consider_migration_gathering ();
1507 consider_migration (NULL,
1512 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1513 "Transmitting %u bytes to peer %u\n",
1522 * Add a message to the set of pending messages for the given peer.
1524 * @param cp peer to send message to
1525 * @param pm message to queue
1526 * @param pr request on which behalf this message is being queued
1529 add_to_pending_messages_for_peer (struct ConnectedPeer *cp,
1530 struct PendingMessage *pm,
1531 struct PendingRequest *pr)
1533 struct PendingMessage *pos;
1534 struct PendingMessageList *pml;
1535 struct GNUNET_PeerIdentity pid;
1537 GNUNET_assert (pm->next == NULL);
1538 GNUNET_assert (pm->pml == NULL);
1539 pml = GNUNET_malloc (sizeof (struct PendingMessageList));
1544 GNUNET_CONTAINER_DLL_insert (pr->pending_head,
1547 pos = cp->pending_messages_head;
1548 while ( (pos != NULL) &&
1549 (pm->priority < pos->priority) )
1551 GNUNET_CONTAINER_DLL_insert_after (cp->pending_messages_head,
1552 cp->pending_messages_tail,
1555 cp->pending_requests++;
1556 if (cp->pending_requests > MAX_QUEUE_PER_PEER)
1557 destroy_pending_message (cp->pending_messages_tail, 0);
1558 GNUNET_PEER_resolve (cp->pid, &pid);
1559 if (NULL != cp->cth)
1560 GNUNET_CORE_notify_transmit_ready_cancel (cp->cth);
1561 /* need to schedule transmission */
1562 cp->cth = GNUNET_CORE_notify_transmit_ready (core,
1563 cp->pending_messages_head->priority,
1566 cp->pending_messages_head->msize,
1569 if (cp->cth == NULL)
1572 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1573 "Failed to schedule transmission with core!\n");
1575 /* FIXME: call stats (rare, bad case) */
1581 * Mingle hash with the mingle_number to produce different bits.
1584 mingle_hash (const GNUNET_HashCode * in,
1585 int32_t mingle_number,
1586 GNUNET_HashCode * hc)
1590 GNUNET_CRYPTO_hash (&mingle_number,
1593 GNUNET_CRYPTO_hash_xor (&m, in, hc);
1598 * Test if the load on this peer is too high
1599 * to even consider processing the query at
1602 * @return GNUNET_YES if the load is too high, GNUNET_NO otherwise
1605 test_load_too_high ()
1607 return GNUNET_NO; // FIXME
1611 /* ******************* Pending Request Refresh Task ******************** */
1616 * We use a random delay to make the timing of requests less
1617 * predictable. This function returns such a random delay. We add a base
1618 * delay of MAX_CORK_DELAY (1s).
1620 * FIXME: make schedule dependent on the specifics of the request?
1621 * Or bandwidth and number of connected peers and load?
1623 * @return random delay to use for some request, between 1s and 1000+TTL_DECREMENT ms
1625 static struct GNUNET_TIME_Relative
1626 get_processing_delay ()
1629 GNUNET_TIME_relative_add (GNUNET_CONSTANTS_MAX_CORK_DELAY,
1630 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
1631 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1637 * We're processing a GET request from another peer and have decided
1638 * to forward it to other peers. This function is called periodically
1639 * and should forward the request to other peers until we have all
1640 * possible replies. If we have transmitted the *only* reply to
1641 * the initiator we should destroy the pending request. If we have
1642 * many replies in the queue to the initiator, we should delay sending
1643 * out more queries until the reply queue has shrunk some.
1645 * @param cls our "struct ProcessGetContext *"
1649 forward_request_task (void *cls,
1650 const struct GNUNET_SCHEDULER_TaskContext *tc);
1654 * Function called after we either failed or succeeded
1655 * at transmitting a query to a peer.
1657 * @param cls the requests "struct PendingRequest*"
1658 * @param tpid ID of receiving peer, 0 on transmission error
1661 transmit_query_continuation (void *cls,
1662 GNUNET_PEER_Id tpid)
1664 struct PendingRequest *pr = cls;
1666 GNUNET_STATISTICS_update (stats,
1667 gettext_noop ("# queries scheduled for forwarding"),
1673 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1674 "Transmission of request failed, will try again later.\n");
1676 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
1677 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
1678 get_processing_delay (),
1679 &forward_request_task,
1683 GNUNET_STATISTICS_update (stats,
1684 gettext_noop ("# queries forwarded"),
1687 GNUNET_PEER_change_rc (tpid, 1);
1688 if (pr->used_pids_off == pr->used_pids_size)
1689 GNUNET_array_grow (pr->used_pids,
1691 pr->used_pids_size * 2 + 2);
1692 pr->used_pids[pr->used_pids_off++] = tpid;
1693 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
1694 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
1695 get_processing_delay (),
1696 &forward_request_task,
1702 * How many bytes should a bloomfilter be if we have already seen
1703 * entry_count responses? Note that BLOOMFILTER_K gives us the number
1704 * of bits set per entry. Furthermore, we should not re-size the
1705 * filter too often (to keep it cheap).
1707 * Since other peers will also add entries but not resize the filter,
1708 * we should generally pick a slightly larger size than what the
1709 * strict math would suggest.
1711 * @return must be a power of two and smaller or equal to 2^15.
1714 compute_bloomfilter_size (unsigned int entry_count)
1717 unsigned int ideal = (entry_count * BLOOMFILTER_K) / 4;
1718 uint16_t max = 1 << 15;
1720 if (entry_count > max)
1723 while ((size < max) && (size < ideal))
1732 * Recalculate our bloom filter for filtering replies. This function
1733 * will create a new bloom filter from scratch, so it should only be
1734 * called if we have no bloomfilter at all (and hence can create a
1735 * fresh one of minimal size without problems) OR if our peer is the
1736 * initiator (in which case we may resize to larger than mimimum size).
1738 * @param pr request for which the BF is to be recomputed
1741 refresh_bloomfilter (struct PendingRequest *pr)
1745 GNUNET_HashCode mhash;
1747 nsize = compute_bloomfilter_size (pr->replies_seen_off);
1748 if (nsize == pr->bf_size)
1749 return; /* size not changed */
1751 GNUNET_CONTAINER_bloomfilter_free (pr->bf);
1752 pr->bf_size = nsize;
1753 pr->mingle = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, -1);
1754 pr->bf = GNUNET_CONTAINER_bloomfilter_init (NULL,
1757 for (i=0;i<pr->replies_seen_off;i++)
1759 mingle_hash (&pr->replies_seen[i], pr->mingle, &mhash);
1760 GNUNET_CONTAINER_bloomfilter_add (pr->bf, &mhash);
1766 * Function called after we've tried to reserve a certain amount of
1767 * bandwidth for a reply. Check if we succeeded and if so send our
1770 * @param cls the requests "struct PendingRequest*"
1771 * @param peer identifies the peer
1772 * @param bpm_in set to the current bandwidth limit (receiving) for this peer
1773 * @param bpm_out set to the current bandwidth limit (sending) for this peer
1774 * @param amount set to the amount that was actually reserved or unreserved
1775 * @param preference current traffic preference for the given peer
1778 target_reservation_cb (void *cls,
1780 GNUNET_PeerIdentity * peer,
1781 struct GNUNET_BANDWIDTH_Value32NBO bpm_in,
1782 struct GNUNET_BANDWIDTH_Value32NBO bpm_out,
1784 uint64_t preference)
1786 struct PendingRequest *pr = cls;
1787 struct ConnectedPeer *cp;
1788 struct PendingMessage *pm;
1789 struct GetMessage *gm;
1790 GNUNET_HashCode *ext;
1800 /* error in communication with core, try again later */
1801 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
1802 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
1803 get_processing_delay (),
1804 &forward_request_task,
1808 // (3) transmit, update ttl/priority
1809 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
1813 /* Peer must have just left */
1815 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1816 "Selected peer disconnected!\n");
1818 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
1819 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
1820 get_processing_delay (),
1821 &forward_request_task,
1825 no_route = GNUNET_NO;
1826 /* FIXME: check against DBLOCK_SIZE and possibly return
1827 amount to reserve; however, this also needs to work
1828 with testcases which currently start out with a far
1829 too low per-peer bw limit, so they would never send
1830 anything. Big issue. */
1836 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1837 "Failed to reserve bandwidth for reply (got %d/%u bytes only)!\n",
1841 GNUNET_STATISTICS_update (stats,
1842 gettext_noop ("# reply bandwidth reservation requests failed"),
1845 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
1846 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
1847 get_processing_delay (),
1848 &forward_request_task,
1850 return; /* this target round failed */
1852 /* FIXME: if we are "quite" busy, we may still want to skip
1853 this round; need more load detection code! */
1854 no_route = GNUNET_YES;
1857 GNUNET_STATISTICS_update (stats,
1858 gettext_noop ("# queries scheduled for forwarding"),
1861 /* build message and insert message into priority queue */
1863 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1864 "Forwarding request `%s' to `%4s'!\n",
1865 GNUNET_h2s (&pr->query),
1870 if (GNUNET_YES == no_route)
1872 bm |= GET_MESSAGE_BIT_RETURN_TO;
1875 if (pr->namespace != NULL)
1877 bm |= GET_MESSAGE_BIT_SKS_NAMESPACE;
1880 if (pr->target_pid != 0)
1882 bm |= GET_MESSAGE_BIT_TRANSMIT_TO;
1885 msize = sizeof (struct GetMessage) + pr->bf_size + k * sizeof(GNUNET_HashCode);
1886 GNUNET_assert (msize < GNUNET_SERVER_MAX_MESSAGE_SIZE);
1887 pm = GNUNET_malloc (sizeof (struct PendingMessage) + msize);
1889 gm = (struct GetMessage*) &pm[1];
1890 gm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_GET);
1891 gm->header.size = htons (msize);
1892 gm->type = htonl (pr->type);
1893 pr->remaining_priority /= 2;
1894 gm->priority = htonl (pr->remaining_priority);
1895 gm->ttl = htonl (pr->ttl);
1896 gm->filter_mutator = htonl(pr->mingle);
1897 gm->hash_bitmap = htonl (bm);
1898 gm->query = pr->query;
1899 ext = (GNUNET_HashCode*) &gm[1];
1901 if (GNUNET_YES == no_route)
1902 GNUNET_PEER_resolve (pr->cp->pid, (struct GNUNET_PeerIdentity*) &ext[k++]);
1903 if (pr->namespace != NULL)
1904 memcpy (&ext[k++], pr->namespace, sizeof (GNUNET_HashCode));
1905 if (pr->target_pid != 0)
1906 GNUNET_PEER_resolve (pr->target_pid, (struct GNUNET_PeerIdentity*) &ext[k++]);
1907 bfdata = (char *) &ext[k];
1909 GNUNET_CONTAINER_bloomfilter_get_raw_data (pr->bf,
1912 pm->cont = &transmit_query_continuation;
1914 add_to_pending_messages_for_peer (cp, pm, pr);
1919 * Closure used for "target_peer_select_cb".
1921 struct PeerSelectionContext
1924 * The request for which we are selecting
1927 struct PendingRequest *pr;
1930 * Current "prime" target.
1932 struct GNUNET_PeerIdentity target;
1935 * How much do we like this target?
1937 double target_score;
1943 * Function called for each connected peer to determine
1944 * which one(s) would make good targets for forwarding.
1946 * @param cls closure (struct PeerSelectionContext)
1947 * @param key current key code (peer identity)
1948 * @param value value in the hash map (struct ConnectedPeer)
1949 * @return GNUNET_YES if we should continue to
1954 target_peer_select_cb (void *cls,
1955 const GNUNET_HashCode * key,
1958 struct PeerSelectionContext *psc = cls;
1959 struct ConnectedPeer *cp = value;
1960 struct PendingRequest *pr = psc->pr;
1965 /* 1) check that this peer is not the initiator */
1967 return GNUNET_YES; /* skip */
1969 /* 2) check if we have already (recently) forwarded to this peer */
1971 for (i=0;i<pr->used_pids_off;i++)
1972 if (pr->used_pids[i] == cp->pid)
1975 if (0 != GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1976 RETRY_PROBABILITY_INV))
1979 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1980 "NOT re-trying query that was previously transmitted %u times\n",
1981 (unsigned int) pr->used_pids_off);
1983 return GNUNET_YES; /* skip */
1988 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1989 "Re-trying query that was previously transmitted %u times to this peer\n",
1992 // 3) calculate how much we'd like to forward to this peer
1993 score = 42; // FIXME!
1994 // FIXME: also need API to gather data on responsiveness
1995 // of this peer (we have fields for that in 'cp', but
1996 // they are never set!)
1998 /* store best-fit in closure */
1999 if (score > psc->target_score)
2001 psc->target_score = score;
2002 psc->target.hashPubKey = *key;
2009 * The priority level imposes a bound on the maximum
2010 * value for the ttl that can be requested.
2012 * @param ttl_in requested ttl
2013 * @param prio given priority
2014 * @return ttl_in if ttl_in is below the limit,
2015 * otherwise the ttl-limit for the given priority
2018 bound_ttl (int32_t ttl_in, uint32_t prio)
2020 unsigned long long allowed;
2024 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
2025 if (ttl_in > allowed)
2027 if (allowed >= (1 << 30))
2036 * We're processing a GET request from another peer and have decided
2037 * to forward it to other peers. This function is called periodically
2038 * and should forward the request to other peers until we have all
2039 * possible replies. If we have transmitted the *only* reply to
2040 * the initiator we should destroy the pending request. If we have
2041 * many replies in the queue to the initiator, we should delay sending
2042 * out more queries until the reply queue has shrunk some.
2044 * @param cls our "struct ProcessGetContext *"
2048 forward_request_task (void *cls,
2049 const struct GNUNET_SCHEDULER_TaskContext *tc)
2051 struct PendingRequest *pr = cls;
2052 struct PeerSelectionContext psc;
2053 struct ConnectedPeer *cp;
2054 struct GNUNET_TIME_Relative delay;
2056 pr->task = GNUNET_SCHEDULER_NO_TASK;
2057 if (pr->irc != NULL)
2060 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2061 "Forwarding of query `%s' not attempted due to pending local lookup!\n",
2062 GNUNET_h2s (&pr->query));
2064 return; /* already pending */
2066 if (GNUNET_YES == pr->local_only)
2067 return; /* configured to not do P2P search */
2068 /* (1) select target */
2070 psc.target_score = DBL_MIN;
2071 GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
2072 &target_peer_select_cb,
2074 if (psc.target_score == DBL_MIN)
2076 delay = get_processing_delay ();
2078 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2079 "No peer selected for forwarding of query `%s', will try again in %llu ms!\n",
2080 GNUNET_h2s (&pr->query),
2083 pr->task = GNUNET_SCHEDULER_add_delayed (sched,
2085 &forward_request_task,
2087 return; /* nobody selected */
2089 /* (3) update TTL/priority */
2091 if (pr->client_request_list != NULL)
2093 /* FIXME: use better algorithm!? */
2094 if (0 == GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2097 /* FIXME: bound priority by "customary" priority used by other peers
2099 pr->ttl = bound_ttl (pr->ttl + TTL_DECREMENT * 2,
2102 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2103 "Trying query `%s' with priority %u and TTL %d.\n",
2104 GNUNET_h2s (&pr->query),
2111 /* FIXME: should we do something here as well!? */
2114 /* (3) reserve reply bandwidth */
2115 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
2116 &psc.target.hashPubKey);
2117 GNUNET_assert (NULL != cp);
2118 pr->irc = GNUNET_CORE_peer_change_preference (sched, cfg,
2120 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
2121 GNUNET_BANDWIDTH_value_init ((uint32_t) -1 /* no limit */),
2123 (uint64_t) cp->inc_preference,
2124 &target_reservation_cb,
2126 cp->inc_preference = 0.0;
2130 /* **************************** P2P PUT Handling ************************ */
2134 * Function called after we either failed or succeeded
2135 * at transmitting a reply to a peer.
2137 * @param cls the requests "struct PendingRequest*"
2138 * @param tpid ID of receiving peer, 0 on transmission error
2141 transmit_reply_continuation (void *cls,
2142 GNUNET_PEER_Id tpid)
2144 struct PendingRequest *pr = cls;
2148 case GNUNET_BLOCK_TYPE_DBLOCK:
2149 case GNUNET_BLOCK_TYPE_IBLOCK:
2150 /* only one reply expected, done with the request! */
2151 destroy_pending_request (pr);
2153 case GNUNET_BLOCK_TYPE_ANY:
2154 case GNUNET_BLOCK_TYPE_KBLOCK:
2155 case GNUNET_BLOCK_TYPE_SBLOCK:
2165 * Transmit the given message by copying it to the target buffer
2166 * "buf". "buf" will be NULL and "size" zero if the socket was closed
2167 * for writing in the meantime. In that case, do nothing
2168 * (the disconnect or shutdown handler will take care of the rest).
2169 * If we were able to transmit messages and there are still more
2170 * pending, ask core again for further calls to this function.
2172 * @param cls closure, pointer to the 'struct ClientList*'
2173 * @param size number of bytes available in buf
2174 * @param buf where the callee should write the message
2175 * @return number of bytes written to buf
2178 transmit_to_client (void *cls,
2179 size_t size, void *buf)
2181 struct ClientList *cl = cls;
2183 struct ClientResponseMessage *creply;
2190 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2191 "Not sending reply, client communication problem.\n");
2196 while ( (NULL != (creply = cl->res_head) ) &&
2197 (creply->msize <= size) )
2199 memcpy (&cbuf[msize], &creply[1], creply->msize);
2200 msize += creply->msize;
2201 size -= creply->msize;
2202 GNUNET_CONTAINER_DLL_remove (cl->res_head,
2205 GNUNET_free (creply);
2208 cl->th = GNUNET_SERVER_notify_transmit_ready (cl->client,
2210 GNUNET_TIME_UNIT_FOREVER_REL,
2211 &transmit_to_client,
2214 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2215 "Transmitted %u bytes to client\n",
2216 (unsigned int) msize);
2223 * Closure for "process_reply" function.
2225 struct ProcessReplyClosure
2228 * The data for the reply.
2233 * Who gave us this reply? NULL for local host.
2235 struct ConnectedPeer *sender;
2238 * When the reply expires.
2240 struct GNUNET_TIME_Absolute expiration;
2248 * Namespace that this reply belongs to
2249 * (if it is of type SBLOCK).
2251 GNUNET_HashCode namespace;
2254 * Type of the block.
2256 enum GNUNET_BLOCK_Type type;
2259 * How much was this reply worth to us?
2266 * We have received a reply; handle it!
2268 * @param cls response (struct ProcessReplyClosure)
2269 * @param key our query
2270 * @param value value in the hash map (info about the query)
2271 * @return GNUNET_YES (we should continue to iterate)
2274 process_reply (void *cls,
2275 const GNUNET_HashCode * key,
2278 struct ProcessReplyClosure *prq = cls;
2279 struct PendingRequest *pr = value;
2280 struct PendingMessage *reply;
2281 struct ClientResponseMessage *creply;
2282 struct ClientList *cl;
2283 struct PutMessage *pm;
2284 struct ConnectedPeer *cp;
2285 struct GNUNET_TIME_Relative cur_delay;
2286 GNUNET_HashCode chash;
2287 GNUNET_HashCode mhash;
2291 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2292 "Matched result (type %u) for query `%s' with pending request\n",
2293 (unsigned int) prq->type,
2296 GNUNET_STATISTICS_update (stats,
2297 gettext_noop ("# replies received and matched"),
2300 if (prq->sender != NULL)
2302 /* FIXME: should we be more precise here and not use
2303 "start_time" but a peer-specific time stamp? */
2304 cur_delay = GNUNET_TIME_absolute_get_duration (pr->start_time);
2305 prq->sender->avg_delay.value
2306 = (prq->sender->avg_delay.value *
2307 (RUNAVG_DELAY_N - 1) + cur_delay.value) / RUNAVG_DELAY_N;
2308 prq->sender->avg_priority
2309 = (prq->sender->avg_priority *
2310 (RUNAVG_DELAY_N - 1) + pr->priority) / (double) RUNAVG_DELAY_N;
2313 GNUNET_PEER_change_rc (prq->sender->last_p2p_replies
2314 [prq->sender->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE], -1);
2315 GNUNET_PEER_change_rc (pr->cp->pid, 1);
2316 prq->sender->last_p2p_replies
2317 [(prq->sender->last_p2p_replies_woff++) % P2P_SUCCESS_LIST_SIZE]
2322 if (NULL != prq->sender->last_client_replies
2323 [(prq->sender->last_client_replies_woff) % CS2P_SUCCESS_LIST_SIZE])
2324 GNUNET_SERVER_client_drop (prq->sender->last_client_replies
2325 [(prq->sender->last_client_replies_woff) % CS2P_SUCCESS_LIST_SIZE]);
2326 prq->sender->last_client_replies
2327 [(prq->sender->last_client_replies_woff++) % CS2P_SUCCESS_LIST_SIZE]
2328 = pr->client_request_list->client_list->client;
2329 GNUNET_SERVER_client_keep (pr->client_request_list->client_list->client);
2332 GNUNET_CRYPTO_hash (prq->data,
2337 case GNUNET_BLOCK_TYPE_DBLOCK:
2338 case GNUNET_BLOCK_TYPE_IBLOCK:
2339 /* only possible reply, stop requesting! */
2340 while (NULL != pr->pending_head)
2341 destroy_pending_message_list_entry (pr->pending_head);
2344 if (pr->client_request_list != NULL)
2345 GNUNET_SERVER_receive_done (pr->client_request_list->client_list->client,
2347 GNUNET_DATASTORE_cancel (pr->qe);
2350 pr->do_remove = GNUNET_YES;
2351 if (pr->task != GNUNET_SCHEDULER_NO_TASK)
2353 GNUNET_SCHEDULER_cancel (sched,
2355 pr->task = GNUNET_SCHEDULER_NO_TASK;
2357 GNUNET_break (GNUNET_YES ==
2358 GNUNET_CONTAINER_multihashmap_remove (query_request_map,
2362 case GNUNET_BLOCK_TYPE_SBLOCK:
2363 if (pr->namespace == NULL)
2368 if (0 != memcmp (pr->namespace,
2370 sizeof (GNUNET_HashCode)))
2372 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2373 _("Reply mismatched in terms of namespace. Discarded.\n"));
2374 return GNUNET_YES; /* wrong namespace */
2376 /* then: fall-through! */
2377 case GNUNET_BLOCK_TYPE_KBLOCK:
2378 case GNUNET_BLOCK_TYPE_NBLOCK:
2381 mingle_hash (&chash, pr->mingle, &mhash);
2382 if (GNUNET_YES == GNUNET_CONTAINER_bloomfilter_test (pr->bf,
2385 GNUNET_STATISTICS_update (stats,
2386 gettext_noop ("# duplicate replies discarded (bloomfilter)"),
2390 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2391 "Duplicate response `%s', discarding.\n",
2392 GNUNET_h2s (&mhash));
2394 return GNUNET_YES; /* duplicate */
2397 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2398 "New response `%s', adding to filter.\n",
2399 GNUNET_h2s (&mhash));
2402 if (pr->client_request_list != NULL)
2404 if (pr->replies_seen_size == pr->replies_seen_off)
2405 GNUNET_array_grow (pr->replies_seen,
2406 pr->replies_seen_size,
2407 pr->replies_seen_size * 2 + 4);
2408 pr->replies_seen[pr->replies_seen_off++] = chash;
2410 if ( (pr->bf == NULL) ||
2411 (pr->client_request_list != NULL) )
2412 refresh_bloomfilter (pr);
2413 GNUNET_CONTAINER_bloomfilter_add (pr->bf,
2420 prq->priority += pr->remaining_priority;
2421 pr->remaining_priority = 0;
2422 if (pr->client_request_list != NULL)
2424 GNUNET_STATISTICS_update (stats,
2425 gettext_noop ("# replies received for local clients"),
2428 cl = pr->client_request_list->client_list;
2429 msize = sizeof (struct PutMessage) + prq->size;
2430 creply = GNUNET_malloc (msize + sizeof (struct ClientResponseMessage));
2431 creply->msize = msize;
2432 creply->client_list = cl;
2433 GNUNET_CONTAINER_DLL_insert_after (cl->res_head,
2437 pm = (struct PutMessage*) &creply[1];
2438 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
2439 pm->header.size = htons (msize);
2440 pm->type = htonl (prq->type);
2441 pm->expiration = GNUNET_TIME_absolute_hton (prq->expiration);
2442 memcpy (&pm[1], prq->data, prq->size);
2446 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2447 "Transmitting result for query `%s' to client\n",
2450 cl->th = GNUNET_SERVER_notify_transmit_ready (cl->client,
2452 GNUNET_TIME_UNIT_FOREVER_REL,
2453 &transmit_to_client,
2456 GNUNET_break (cl->th != NULL);
2458 destroy_pending_request (pr);
2464 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2465 "Transmitting result for query `%s' to other peer (PID=%u)\n",
2467 (unsigned int) cp->pid);
2469 GNUNET_STATISTICS_update (stats,
2470 gettext_noop ("# replies received for other peers"),
2473 msize = sizeof (struct PutMessage) + prq->size;
2474 reply = GNUNET_malloc (msize + sizeof (struct PendingMessage));
2475 reply->cont = &transmit_reply_continuation;
2476 reply->cont_cls = pr;
2477 reply->msize = msize;
2478 reply->priority = (uint32_t) -1; /* send replies first! */
2479 pm = (struct PutMessage*) &reply[1];
2480 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
2481 pm->header.size = htons (msize);
2482 pm->type = htonl (prq->type);
2483 pm->expiration = GNUNET_TIME_absolute_hton (prq->expiration);
2484 memcpy (&pm[1], prq->data, prq->size);
2485 add_to_pending_messages_for_peer (cp, reply, pr);
2492 * Continuation called to notify client about result of the
2495 * @param cls closure
2496 * @param success GNUNET_SYSERR on failure
2497 * @param msg NULL on success, otherwise an error message
2500 put_migration_continuation (void *cls,
2509 * Handle P2P "PUT" message.
2511 * @param cls closure, always NULL
2512 * @param other the other peer involved (sender or receiver, NULL
2513 * for loopback messages where we are both sender and receiver)
2514 * @param message the actual message
2515 * @param latency reported latency of the connection with 'other'
2516 * @param distance reported distance (DV) to 'other'
2517 * @return GNUNET_OK to keep the connection open,
2518 * GNUNET_SYSERR to close it (signal serious error)
2521 handle_p2p_put (void *cls,
2522 const struct GNUNET_PeerIdentity *other,
2523 const struct GNUNET_MessageHeader *message,
2524 struct GNUNET_TIME_Relative latency,
2527 const struct PutMessage *put;
2530 enum GNUNET_BLOCK_Type type;
2531 struct GNUNET_TIME_Absolute expiration;
2532 GNUNET_HashCode query;
2533 struct ProcessReplyClosure prq;
2534 const struct SBlock *sb;
2536 msize = ntohs (message->size);
2537 if (msize < sizeof (struct PutMessage))
2540 return GNUNET_SYSERR;
2542 put = (const struct PutMessage*) message;
2543 dsize = msize - sizeof (struct PutMessage);
2544 type = ntohl (put->type);
2545 expiration = GNUNET_TIME_absolute_ntoh (put->expiration);
2548 GNUNET_BLOCK_check_block (type,
2553 GNUNET_break_op (0);
2554 return GNUNET_SYSERR;
2556 if (type == GNUNET_BLOCK_TYPE_ONDEMAND)
2557 return GNUNET_SYSERR;
2558 if (GNUNET_BLOCK_TYPE_SBLOCK == type)
2560 sb = (const struct SBlock*) &put[1];
2561 GNUNET_CRYPTO_hash (&sb->subspace,
2562 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2567 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2568 "Received result for query `%s' from peer `%4s'\n",
2569 GNUNET_h2s (&query),
2570 GNUNET_i2s (other));
2572 GNUNET_STATISTICS_update (stats,
2573 gettext_noop ("# replies received (overall)"),
2576 /* now, lookup 'query' */
2577 prq.data = (const void*) &put[1];
2579 prq.sender = GNUNET_CONTAINER_multihashmap_get (connected_peers,
2580 &other->hashPubKey);
2583 prq.expiration = expiration;
2585 GNUNET_CONTAINER_multihashmap_get_multiple (query_request_map,
2589 if (GNUNET_YES == active_migration)
2591 GNUNET_DATASTORE_put (dsh,
2592 0, &query, dsize, &put[1],
2593 type, prq.priority, 1 /* anonymity */,
2595 1 + prq.priority, MAX_DATASTORE_QUEUE,
2596 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
2597 &put_migration_continuation,
2604 /* **************************** P2P GET Handling ************************ */
2608 * Closure for 'check_duplicate_request_{peer,client}'.
2610 struct CheckDuplicateRequestClosure
2613 * The new request we should check if it already exists.
2615 const struct PendingRequest *pr;
2618 * Existing request found by the checker, NULL if none.
2620 struct PendingRequest *have;
2625 * Iterator over entries in the 'query_request_map' that
2626 * tries to see if we have the same request pending from
2627 * the same client already.
2629 * @param cls closure (our 'struct CheckDuplicateRequestClosure')
2630 * @param key current key code (query, ignored, must match)
2631 * @param value value in the hash map (a 'struct PendingRequest'
2632 * that already exists)
2633 * @return GNUNET_YES if we should continue to
2634 * iterate (no match yet)
2635 * GNUNET_NO if not (match found).
2638 check_duplicate_request_client (void *cls,
2639 const GNUNET_HashCode * key,
2642 struct CheckDuplicateRequestClosure *cdc = cls;
2643 struct PendingRequest *have = value;
2645 if (have->client_request_list == NULL)
2647 if ( (cdc->pr->client_request_list->client_list->client == have->client_request_list->client_list->client) &&
2658 * We're processing (local) results for a search request
2659 * from another peer. Pass applicable results to the
2660 * peer and if we are done either clean up (operation
2661 * complete) or forward to other peers (more results possible).
2663 * @param cls our closure (struct LocalGetContext)
2664 * @param key key for the content
2665 * @param size number of bytes in data
2666 * @param data content stored
2667 * @param type type of the content
2668 * @param priority priority of the content
2669 * @param anonymity anonymity-level for the content
2670 * @param expiration expiration time for the content
2671 * @param uid unique identifier for the datum;
2672 * maybe 0 if no unique identifier is available
2675 process_local_reply (void *cls,
2676 const GNUNET_HashCode * key,
2679 enum GNUNET_BLOCK_Type type,
2682 struct GNUNET_TIME_Absolute
2686 struct PendingRequest *pr = cls;
2687 struct ProcessReplyClosure prq;
2688 struct CheckDuplicateRequestClosure cdrc;
2689 const struct SBlock *sb;
2690 GNUNET_HashCode dhash;
2691 GNUNET_HashCode mhash;
2692 GNUNET_HashCode query;
2697 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2698 "Done processing local replies, forwarding request to other peers.\n");
2701 if (pr->client_request_list != NULL)
2703 GNUNET_SERVER_receive_done (pr->client_request_list->client_list->client,
2705 /* Figure out if this is a duplicate request and possibly
2706 merge 'struct PendingRequest' entries */
2709 GNUNET_CONTAINER_multihashmap_get_multiple (query_request_map,
2711 &check_duplicate_request_client,
2713 if (cdrc.have != NULL)
2716 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2717 "Received request for block `%s' twice from client, will only request once.\n",
2718 GNUNET_h2s (&pr->query));
2721 destroy_pending_request (pr);
2726 /* no more results */
2727 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
2728 pr->task = GNUNET_SCHEDULER_add_now (sched,
2729 &forward_request_task,
2734 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2735 "New local response to `%s' of type %u.\n",
2739 if (type == GNUNET_BLOCK_TYPE_ONDEMAND)
2742 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2743 "Found ONDEMAND block, performing on-demand encoding\n");
2745 GNUNET_STATISTICS_update (stats,
2746 gettext_noop ("# on-demand blocks matched requests"),
2750 GNUNET_FS_handle_on_demand_block (key, size, data, type, priority,
2751 anonymity, expiration, uid,
2752 &process_local_reply,
2755 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
2758 /* check for duplicates */
2759 GNUNET_CRYPTO_hash (data, size, &dhash);
2760 mingle_hash (&dhash,
2763 if ( (pr->bf != NULL) &&
2765 GNUNET_CONTAINER_bloomfilter_test (pr->bf,
2769 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2770 "Result from datastore filtered by bloomfilter (duplicate).\n");
2772 GNUNET_STATISTICS_update (stats,
2773 gettext_noop ("# results filtered by query bloomfilter"),
2777 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
2781 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2782 "Found result for query `%s' in local datastore\n",
2785 GNUNET_STATISTICS_update (stats,
2786 gettext_noop ("# results found locally"),
2789 pr->results_found++;
2790 memset (&prq, 0, sizeof (prq));
2792 prq.expiration = expiration;
2794 if (GNUNET_BLOCK_TYPE_SBLOCK == type)
2796 sb = (const struct SBlock*) data;
2797 GNUNET_CRYPTO_hash (&sb->subspace,
2798 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2801 if (GNUNET_OK != GNUNET_BLOCK_check_block (type,
2807 GNUNET_DATASTORE_remove (dsh,
2811 GNUNET_TIME_UNIT_FOREVER_REL,
2813 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
2816 if ( (type == GNUNET_BLOCK_TYPE_DBLOCK) ||
2817 (type == GNUNET_BLOCK_TYPE_IBLOCK) )
2820 GNUNET_DATASTORE_get_next (dsh, GNUNET_NO);
2822 else if ( (pr->client_request_list == NULL) &&
2823 ( (GNUNET_YES == test_load_too_high()) ||
2824 (pr->results_found > 5 + 2 * pr->priority) ) )
2827 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2828 "Load too high, done with request\n");
2830 GNUNET_STATISTICS_update (stats,
2831 gettext_noop ("# processing result set cut short due to load"),
2835 GNUNET_DATASTORE_get_next (dsh, GNUNET_NO);
2837 else if (pr->qe != NULL)
2838 GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
2840 prq.priority = priority;
2841 process_reply (&prq, key, pr);
2846 * We've received a request with the specified priority. Bound it
2847 * according to how much we trust the given peer.
2849 * @param prio_in requested priority
2850 * @param cp the peer making the request
2851 * @return effective priority
2854 bound_priority (uint32_t prio_in,
2855 struct ConnectedPeer *cp)
2862 * Iterator over entries in the 'query_request_map' that
2863 * tries to see if we have the same request pending from
2864 * the same peer already.
2866 * @param cls closure (our 'struct CheckDuplicateRequestClosure')
2867 * @param key current key code (query, ignored, must match)
2868 * @param value value in the hash map (a 'struct PendingRequest'
2869 * that already exists)
2870 * @return GNUNET_YES if we should continue to
2871 * iterate (no match yet)
2872 * GNUNET_NO if not (match found).
2875 check_duplicate_request_peer (void *cls,
2876 const GNUNET_HashCode * key,
2879 struct CheckDuplicateRequestClosure *cdc = cls;
2880 struct PendingRequest *have = value;
2882 if (cdc->pr->target_pid == have->target_pid)
2892 * Handle P2P "GET" request.
2894 * @param cls closure, always NULL
2895 * @param other the other peer involved (sender or receiver, NULL
2896 * for loopback messages where we are both sender and receiver)
2897 * @param message the actual message
2898 * @param latency reported latency of the connection with 'other'
2899 * @param distance reported distance (DV) to 'other'
2900 * @return GNUNET_OK to keep the connection open,
2901 * GNUNET_SYSERR to close it (signal serious error)
2904 handle_p2p_get (void *cls,
2905 const struct GNUNET_PeerIdentity *other,
2906 const struct GNUNET_MessageHeader *message,
2907 struct GNUNET_TIME_Relative latency,
2910 struct PendingRequest *pr;
2911 struct ConnectedPeer *cp;
2912 struct ConnectedPeer *cps;
2913 struct CheckDuplicateRequestClosure cdc;
2914 struct GNUNET_TIME_Relative timeout;
2916 const struct GetMessage *gm;
2918 const GNUNET_HashCode *opt;
2921 uint32_t ttl_decrement;
2922 enum GNUNET_BLOCK_Type type;
2926 msize = ntohs(message->size);
2927 if (msize < sizeof (struct GetMessage))
2929 GNUNET_break_op (0);
2930 return GNUNET_SYSERR;
2932 gm = (const struct GetMessage*) message;
2933 type = ntohl (gm->type);
2936 case GNUNET_BLOCK_TYPE_ANY:
2937 case GNUNET_BLOCK_TYPE_DBLOCK:
2938 case GNUNET_BLOCK_TYPE_IBLOCK:
2939 case GNUNET_BLOCK_TYPE_KBLOCK:
2940 case GNUNET_BLOCK_TYPE_SBLOCK:
2943 GNUNET_break_op (0);
2944 return GNUNET_SYSERR;
2946 bm = ntohl (gm->hash_bitmap);
2954 if (msize < sizeof (struct GetMessage) + bits * sizeof (GNUNET_HashCode))
2956 GNUNET_break_op (0);
2957 return GNUNET_SYSERR;
2959 opt = (const GNUNET_HashCode*) &gm[1];
2960 bfsize = msize - sizeof (struct GetMessage) + bits * sizeof (GNUNET_HashCode);
2961 bm = ntohl (gm->hash_bitmap);
2962 if ( (0 != (bm & GET_MESSAGE_BIT_SKS_NAMESPACE)) &&
2963 (type != GNUNET_BLOCK_TYPE_SBLOCK) )
2965 GNUNET_break_op (0);
2966 return GNUNET_SYSERR;
2969 cps = GNUNET_CONTAINER_multihashmap_get (connected_peers,
2970 &other->hashPubKey);
2973 /* peer must have just disconnected */
2974 GNUNET_STATISTICS_update (stats,
2975 gettext_noop ("# requests dropped due to initiator not being connected"),
2978 return GNUNET_SYSERR;
2980 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
2981 cp = GNUNET_CONTAINER_multihashmap_get (connected_peers,
2988 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
2989 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2990 "Failed to find RETURN-TO peer `%4s' in connection set. Dropping query.\n",
2991 GNUNET_i2s ((const struct GNUNET_PeerIdentity*) &opt[bits-1]));
2994 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2995 "Failed to find peer `%4s' in connection set. Dropping query.\n",
2996 GNUNET_i2s (other));
2998 GNUNET_STATISTICS_update (stats,
2999 gettext_noop ("# requests dropped due to missing reverse route"),
3002 /* FIXME: try connect? */
3005 /* note that we can really only check load here since otherwise
3006 peers could find out that we are overloaded by not being
3007 disconnected after sending us a malformed query... */
3008 if (GNUNET_YES == test_load_too_high ())
3011 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3012 "Dropping query from `%s', this peer is too busy.\n",
3013 GNUNET_i2s (other));
3015 GNUNET_STATISTICS_update (stats,
3016 gettext_noop ("# requests dropped due to high load"),
3023 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3024 "Received request for `%s' of type %u from peer `%4s' with flags %u\n",
3025 GNUNET_h2s (&gm->query),
3026 (unsigned int) type,
3030 have_ns = (0 != (bm & GET_MESSAGE_BIT_SKS_NAMESPACE));
3031 pr = GNUNET_malloc (sizeof (struct PendingRequest) +
3032 (have_ns ? sizeof(GNUNET_HashCode) : 0));
3034 pr->namespace = (GNUNET_HashCode*) &pr[1];
3036 pr->mingle = ntohl (gm->filter_mutator);
3037 if (0 != (bm & GET_MESSAGE_BIT_SKS_NAMESPACE))
3038 memcpy (&pr[1], &opt[bits++], sizeof (GNUNET_HashCode));
3039 if (0 != (bm & GET_MESSAGE_BIT_TRANSMIT_TO))
3040 pr->target_pid = GNUNET_PEER_intern ((const struct GNUNET_PeerIdentity*) &opt[bits++]);
3042 pr->anonymity_level = 1;
3043 pr->priority = bound_priority (ntohl (gm->priority), cps);
3044 pr->ttl = bound_ttl (ntohl (gm->ttl), pr->priority);
3045 pr->query = gm->query;
3046 /* decrement ttl (always) */
3047 ttl_decrement = 2 * TTL_DECREMENT +
3048 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3050 if ( (pr->ttl < 0) &&
3051 (((int32_t)(pr->ttl - ttl_decrement)) > 0) )
3054 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3055 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
3060 GNUNET_STATISTICS_update (stats,
3061 gettext_noop ("# requests dropped due TTL underflow"),
3064 /* integer underflow => drop (should be very rare)! */
3068 pr->ttl -= ttl_decrement;
3069 pr->start_time = GNUNET_TIME_absolute_get ();
3071 /* get bloom filter */
3074 pr->bf = GNUNET_CONTAINER_bloomfilter_init ((const char*) &opt[bits],
3077 pr->bf_size = bfsize;
3082 GNUNET_CONTAINER_multihashmap_get_multiple (query_request_map,
3084 &check_duplicate_request_peer,
3086 if (cdc.have != NULL)
3088 if (cdc.have->start_time.value + cdc.have->ttl >=
3089 pr->start_time.value + pr->ttl)
3091 /* existing request has higher TTL, drop new one! */
3092 cdc.have->priority += pr->priority;
3093 destroy_pending_request (pr);
3095 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3096 "Have existing request with higher TTL, dropping new request.\n",
3097 GNUNET_i2s (other));
3099 GNUNET_STATISTICS_update (stats,
3100 gettext_noop ("# requests dropped due to higher-TTL request"),
3107 /* existing request has lower TTL, drop old one! */
3108 pr->priority += cdc.have->priority;
3109 /* Possible optimization: if we have applicable pending
3110 replies in 'cdc.have', we might want to move those over
3111 (this is a really rare special-case, so it is not clear
3112 that this would be worth it) */
3113 destroy_pending_request (cdc.have);
3114 /* keep processing 'pr'! */
3119 GNUNET_break (GNUNET_OK ==
3120 GNUNET_CONTAINER_multihashmap_put (query_request_map,
3123 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
3124 GNUNET_break (GNUNET_OK ==
3125 GNUNET_CONTAINER_multihashmap_put (peer_request_map,
3128 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
3130 pr->hnode = GNUNET_CONTAINER_heap_insert (requests_by_expiration_heap,
3132 pr->start_time.value + pr->ttl);
3134 GNUNET_STATISTICS_update (stats,
3135 gettext_noop ("# P2P searches received"),
3138 GNUNET_STATISTICS_update (stats,
3139 gettext_noop ("# P2P searches active"),
3143 /* calculate change in traffic preference */
3144 preference = (double) pr->priority;
3145 if (preference < QUERY_BANDWIDTH_VALUE)
3146 preference = QUERY_BANDWIDTH_VALUE;
3147 cps->inc_preference += preference;
3149 /* process locally */
3150 if (type == GNUNET_BLOCK_TYPE_DBLOCK)
3151 type = GNUNET_BLOCK_TYPE_ANY; /* to get on-demand as well */
3152 timeout = GNUNET_TIME_relative_multiply (BASIC_DATASTORE_REQUEST_DELAY,
3153 (pr->priority + 1));
3154 pr->qe = GNUNET_DATASTORE_get (dsh,
3158 MAX_DATASTORE_QUEUE,
3160 &process_local_reply,
3163 /* Are multiple results possible? If so, start processing remotely now! */
3166 case GNUNET_BLOCK_TYPE_DBLOCK:
3167 case GNUNET_BLOCK_TYPE_IBLOCK:
3168 /* only one result, wait for datastore */
3171 if (pr->task == GNUNET_SCHEDULER_NO_TASK)
3172 pr->task = GNUNET_SCHEDULER_add_now (sched,
3173 &forward_request_task,
3177 /* make sure we don't track too many requests */
3178 if (GNUNET_CONTAINER_heap_get_size (requests_by_expiration_heap) > max_pending_requests)
3180 pr = GNUNET_CONTAINER_heap_peek (requests_by_expiration_heap);
3181 destroy_pending_request (pr);
3187 /* **************************** CS GET Handling ************************ */
3191 * Handle START_SEARCH-message (search request from client).
3193 * @param cls closure
3194 * @param client identification of the client
3195 * @param message the actual message
3198 handle_start_search (void *cls,
3199 struct GNUNET_SERVER_Client *client,
3200 const struct GNUNET_MessageHeader *message)
3202 static GNUNET_HashCode all_zeros;
3203 const struct SearchMessage *sm;
3204 struct ClientList *cl;
3205 struct ClientRequestList *crl;
3206 struct PendingRequest *pr;
3209 enum GNUNET_BLOCK_Type type;
3211 msize = ntohs (message->size);
3212 if ( (msize < sizeof (struct SearchMessage)) ||
3213 (0 != (msize - sizeof (struct SearchMessage)) % sizeof (GNUNET_HashCode)) )
3216 GNUNET_SERVER_receive_done (client,
3220 GNUNET_STATISTICS_update (stats,
3221 gettext_noop ("# client searches received"),
3224 sc = (msize - sizeof (struct SearchMessage)) / sizeof (GNUNET_HashCode);
3225 sm = (const struct SearchMessage*) message;
3226 type = ntohl (sm->type);
3228 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3229 "Received request for `%s' of type %u from local client\n",
3230 GNUNET_h2s (&sm->query),
3231 (unsigned int) type);
3235 case GNUNET_BLOCK_TYPE_ANY:
3236 case GNUNET_BLOCK_TYPE_DBLOCK:
3237 case GNUNET_BLOCK_TYPE_IBLOCK:
3238 case GNUNET_BLOCK_TYPE_KBLOCK:
3239 case GNUNET_BLOCK_TYPE_SBLOCK:
3240 case GNUNET_BLOCK_TYPE_NBLOCK:
3244 GNUNET_SERVER_receive_done (client,
3250 while ( (cl != NULL) &&
3251 (cl->client != client) )
3255 cl = GNUNET_malloc (sizeof (struct ClientList));
3256 cl->client = client;
3257 GNUNET_SERVER_client_keep (client);
3258 cl->next = client_list;
3261 /* detect duplicate KBLOCK requests */
3262 if ( (type == GNUNET_BLOCK_TYPE_KBLOCK) ||
3263 (type == GNUNET_BLOCK_TYPE_NBLOCK) ||
3264 (type == GNUNET_BLOCK_TYPE_ANY) )
3267 while ( (crl != NULL) &&
3268 ( (0 != memcmp (&crl->req->query,
3270 sizeof (GNUNET_HashCode))) ||
3271 (crl->req->type != type) ) )
3276 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3277 "Have existing request, merging content-seen lists.\n");
3280 /* Duplicate request (used to send long list of
3281 known/blocked results); merge 'pr->replies_seen'
3282 and update bloom filter */
3283 GNUNET_array_grow (pr->replies_seen,
3284 pr->replies_seen_size,
3285 pr->replies_seen_off + sc);
3286 memcpy (&pr->replies_seen[pr->replies_seen_off],
3288 sc * sizeof (GNUNET_HashCode));
3289 pr->replies_seen_off += sc;
3290 refresh_bloomfilter (pr);
3291 GNUNET_STATISTICS_update (stats,
3292 gettext_noop ("# client searches updated (merged content seen list)"),
3295 GNUNET_SERVER_receive_done (client,
3300 GNUNET_STATISTICS_update (stats,
3301 gettext_noop ("# client searches active"),
3304 pr = GNUNET_malloc (sizeof (struct PendingRequest) +
3305 ((type == GNUNET_BLOCK_TYPE_SBLOCK) ? sizeof(GNUNET_HashCode) : 0));
3306 crl = GNUNET_malloc (sizeof (struct ClientRequestList));
3307 memset (crl, 0, sizeof (struct ClientRequestList));
3308 crl->client_list = cl;
3309 GNUNET_CONTAINER_DLL_insert (cl->rl_head,
3314 pr->client_request_list = crl;
3315 GNUNET_array_grow (pr->replies_seen,
3316 pr->replies_seen_size,
3318 memcpy (pr->replies_seen,
3320 sc * sizeof (GNUNET_HashCode));
3321 pr->replies_seen_off = sc;
3322 pr->anonymity_level = ntohl (sm->anonymity_level);
3323 refresh_bloomfilter (pr);
3324 pr->query = sm->query;
3325 if (0 == (1 & ntohl (sm->options)))
3326 pr->local_only = GNUNET_NO;
3328 pr->local_only = GNUNET_YES;
3331 case GNUNET_BLOCK_TYPE_DBLOCK:
3332 case GNUNET_BLOCK_TYPE_IBLOCK:
3333 if (0 != memcmp (&sm->target,
3335 sizeof (GNUNET_HashCode)))
3336 pr->target_pid = GNUNET_PEER_intern ((const struct GNUNET_PeerIdentity*) &sm->target);
3338 case GNUNET_BLOCK_TYPE_SBLOCK:
3339 pr->namespace = (GNUNET_HashCode*) &pr[1];
3340 memcpy (&pr[1], &sm->target, sizeof (GNUNET_HashCode));
3345 GNUNET_break (GNUNET_OK ==
3346 GNUNET_CONTAINER_multihashmap_put (query_request_map,
3349 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
3350 if (type == GNUNET_BLOCK_TYPE_DBLOCK)
3351 type = GNUNET_BLOCK_TYPE_ANY; /* get on-demand blocks too! */
3352 pr->qe = GNUNET_DATASTORE_get (dsh,
3356 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
3357 &process_local_reply,
3362 /* **************************** Startup ************************ */
3366 * List of handlers for P2P messages
3367 * that we care about.
3369 static struct GNUNET_CORE_MessageHandler p2p_handlers[] =
3372 GNUNET_MESSAGE_TYPE_FS_GET, 0 },
3374 GNUNET_MESSAGE_TYPE_FS_PUT, 0 },
3380 * List of handlers for the messages understood by this
3383 static struct GNUNET_SERVER_MessageHandler handlers[] = {
3384 {&GNUNET_FS_handle_index_start, NULL,
3385 GNUNET_MESSAGE_TYPE_FS_INDEX_START, 0},
3386 {&GNUNET_FS_handle_index_list_get, NULL,
3387 GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_GET, sizeof(struct GNUNET_MessageHeader) },
3388 {&GNUNET_FS_handle_unindex, NULL, GNUNET_MESSAGE_TYPE_FS_UNINDEX,
3389 sizeof (struct UnindexMessage) },
3390 {&handle_start_search, NULL, GNUNET_MESSAGE_TYPE_FS_START_SEARCH,
3397 * Process fs requests.
3399 * @param s scheduler to use
3400 * @param server the initialized server
3401 * @param c configuration to use
3404 main_init (struct GNUNET_SCHEDULER_Handle *s,
3405 struct GNUNET_SERVER_Handle *server,
3406 const struct GNUNET_CONFIGURATION_Handle *c)
3410 stats = GNUNET_STATISTICS_create (sched, "fs", cfg);
3411 min_migration_delay = GNUNET_TIME_UNIT_SECONDS; // FIXME: get from config
3412 connected_peers = GNUNET_CONTAINER_multihashmap_create (128); // FIXME: get size from config
3413 query_request_map = GNUNET_CONTAINER_multihashmap_create (128); // FIXME: get size from config
3414 peer_request_map = GNUNET_CONTAINER_multihashmap_create (128); // FIXME: get size from config
3415 requests_by_expiration_heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
3416 core = GNUNET_CORE_connect (sched,
3418 GNUNET_TIME_UNIT_FOREVER_REL,
3421 &peer_connect_handler,
3422 &peer_disconnect_handler,
3428 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3429 _("Failed to connect to `%s' service.\n"),
3431 GNUNET_CONTAINER_multihashmap_destroy (connected_peers);
3432 connected_peers = NULL;
3433 GNUNET_CONTAINER_multihashmap_destroy (query_request_map);
3434 query_request_map = NULL;
3435 GNUNET_CONTAINER_heap_destroy (requests_by_expiration_heap);
3436 requests_by_expiration_heap = NULL;
3437 GNUNET_CONTAINER_multihashmap_destroy (peer_request_map);
3438 peer_request_map = NULL;
3441 GNUNET_DATASTORE_disconnect (dsh, GNUNET_NO);
3444 return GNUNET_SYSERR;
3446 /* FIXME: distinguish between sending and storing in options? */
3447 if (active_migration)
3448 consider_migration_gathering ();
3449 GNUNET_SERVER_disconnect_notify (server,
3450 &handle_client_disconnect,
3452 GNUNET_SERVER_add_handlers (server, handlers);
3453 GNUNET_SCHEDULER_add_delayed (sched,
3454 GNUNET_TIME_UNIT_FOREVER_REL,
3462 * Process fs requests.
3464 * @param cls closure
3465 * @param sched scheduler to use
3466 * @param server the initialized server
3467 * @param cfg configuration to use
3471 struct GNUNET_SCHEDULER_Handle *sched,
3472 struct GNUNET_SERVER_Handle *server,
3473 const struct GNUNET_CONFIGURATION_Handle *cfg)
3475 active_migration = GNUNET_CONFIGURATION_get_value_yesno (cfg,
3478 dsh = GNUNET_DATASTORE_connect (cfg,
3482 GNUNET_SCHEDULER_shutdown (sched);
3485 if ( (GNUNET_OK != GNUNET_FS_indexing_init (sched, cfg, dsh)) ||
3486 (GNUNET_OK != main_init (sched, server, cfg)) )
3488 GNUNET_SCHEDULER_shutdown (sched);
3489 GNUNET_DATASTORE_disconnect (dsh, GNUNET_NO);
3497 * The main function for the fs service.
3499 * @param argc number of arguments from the command line
3500 * @param argv command line arguments
3501 * @return 0 ok, 1 on error
3504 main (int argc, char *const *argv)
3506 return (GNUNET_OK ==
3507 GNUNET_SERVICE_run (argc,
3510 GNUNET_SERVICE_OPTION_NONE,
3511 &run, NULL)) ? 0 : 1;
3514 /* end of gnunet-service-fs.c */