2 This file is part of GNUnet.
3 (C) 2011 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file fs/gnunet-service-fs_cp.c
23 * @brief API to handle 'connected peers'
24 * @author Christian Grothoff
27 #include "gnunet_load_lib.h"
28 #include "gnunet-service-fs.h"
29 #include "gnunet-service-fs_cp.h"
30 #include "gnunet-service-fs_pe.h"
31 #include "gnunet-service-fs_pr.h"
32 #include "gnunet-service-fs_push.h"
35 * How often do we flush trust values to disk?
37 #define TRUST_FLUSH_FREQ GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
40 * After how long do we discard a reply?
42 #define REPLY_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
46 * Handle to cancel a transmission request.
48 struct GSF_PeerTransmitHandle
52 * Kept in a doubly-linked list.
54 struct GSF_PeerTransmitHandle *next;
57 * Kept in a doubly-linked list.
59 struct GSF_PeerTransmitHandle *prev;
62 * Handle for an active request for transmission to this
63 * peer, or NULL (if core queue was full).
65 struct GNUNET_CORE_TransmitHandle *cth;
68 * Time when this transmission request was issued.
70 struct GNUNET_TIME_Absolute transmission_request_start_time;
73 * Timeout for this request.
75 struct GNUNET_TIME_Absolute timeout;
78 * Task called on timeout, or 0 for none.
80 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
83 * Function to call to get the actual message.
85 GSF_GetMessageCallback gmc;
88 * Peer this request targets.
90 struct GSF_ConnectedPeer *cp;
98 * Size of the message to be transmitted.
103 * Set to 1 if we're currently in the process of calling
104 * 'GNUNET_CORE_notify_transmit_ready' (so while cth is
105 * NULL, we should not call notify_transmit_ready for this
108 unsigned int cth_in_progress;
111 * GNUNET_YES if this is a query, GNUNET_NO for content.
116 * Did we get a reservation already?
121 * Priority of this request.
129 * Handle for an entry in our delay list.
131 struct GSF_DelayedHandle
135 * Kept in a doubly-linked list.
137 struct GSF_DelayedHandle *next;
140 * Kept in a doubly-linked list.
142 struct GSF_DelayedHandle *prev;
145 * Peer this transmission belongs to.
147 struct GSF_ConnectedPeer *cp;
150 * The PUT that was delayed.
152 struct PutMessage *pm;
155 * Task for the delay.
157 GNUNET_SCHEDULER_TaskIdentifier delay_task;
160 * Size of the message.
168 * Information per peer and request.
174 * Handle to generic request.
176 struct GSF_PendingRequest *pr;
179 * Handle to specific peer.
181 struct GSF_ConnectedPeer *cp;
184 * Task for asynchronous stopping of this request.
186 GNUNET_SCHEDULER_TaskIdentifier kill_task;
194 struct GSF_ConnectedPeer
198 * Performance data for this peer.
200 struct GSF_PeerPerformanceData ppd;
203 * Time until when we blocked this peer from migrating
206 struct GNUNET_TIME_Absolute last_migration_block;
209 * Task scheduled to revive migration to this peer.
211 GNUNET_SCHEDULER_TaskIdentifier mig_revive_task;
214 * Messages (replies, queries, content migration) we would like to
215 * send to this peer in the near future. Sorted by priority, head.
217 struct GSF_PeerTransmitHandle *pth_head;
220 * Messages (replies, queries, content migration) we would like to
221 * send to this peer in the near future. Sorted by priority, tail.
223 struct GSF_PeerTransmitHandle *pth_tail;
226 * Messages (replies, queries, content migration) we would like to
227 * send to this peer in the near future. Sorted by priority, head.
229 struct GSF_DelayedHandle *delayed_head;
232 * Messages (replies, queries, content migration) we would like to
233 * send to this peer in the near future. Sorted by priority, tail.
235 struct GSF_DelayedHandle *delayed_tail;
238 * Migration stop message in our queue, or NULL if we have none pending.
240 struct GSF_PeerTransmitHandle *migration_pth;
243 * Context of our GNUNET_CORE_peer_change_preference call (or NULL).
245 struct GNUNET_CORE_InformationRequestContext *irc;
248 * Task scheduled if we need to retry bandwidth reservation later.
250 GNUNET_SCHEDULER_TaskIdentifier irc_delay_task;
253 * Active requests from this neighbour, map of query to 'struct PeerRequest'.
255 struct GNUNET_CONTAINER_MultiHashMap *request_map;
258 * Increase in traffic preference still to be submitted
259 * to the core service for this peer.
261 uint64_t inc_preference;
264 * Trust rating for this peer on disk.
269 * Which offset in "last_p2p_replies" will be updated next?
270 * (we go round-robin).
272 unsigned int last_p2p_replies_woff;
275 * Which offset in "last_client_replies" will be updated next?
276 * (we go round-robin).
278 unsigned int last_client_replies_woff;
281 * Current offset into 'last_request_times' ring buffer.
283 unsigned int last_request_times_off;
286 * GNUNET_YES if we did successfully reserve 32k bandwidth,
295 * Map from peer identities to 'struct GSF_ConnectPeer' entries.
297 static struct GNUNET_CONTAINER_MultiHashMap *cp_map;
300 * Where do we store trust information?
302 static char *trustDirectory;
306 * Get the filename under which we would store the GNUNET_HELLO_Message
307 * for the given host and protocol.
308 * @return filename of the form DIRECTORY/HOSTID
311 get_trust_filename (const struct GNUNET_PeerIdentity *id)
313 struct GNUNET_CRYPTO_HashAsciiEncoded fil;
316 GNUNET_CRYPTO_hash_to_enc (&id->hashPubKey, &fil);
317 GNUNET_asprintf (&fn, "%s%s%s", trustDirectory, DIR_SEPARATOR_STR, &fil);
323 * Find latency information in 'atsi'.
325 * @param atsi performance data
326 * @return connection latency
328 static struct GNUNET_TIME_Relative
329 get_latency (const struct GNUNET_TRANSPORT_ATS_Information *atsi)
332 return GNUNET_TIME_UNIT_SECONDS;
333 while ((ntohl (atsi->type) != GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR) &&
334 (ntohl (atsi->type) != GNUNET_TRANSPORT_ATS_QUALITY_NET_DELAY))
336 if (ntohl (atsi->type) == GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR)
345 /* how can we not have latency data? */
346 return GNUNET_TIME_UNIT_SECONDS;
348 return GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
349 ntohl (atsi->value));
354 * Update the performance information kept for the given peer.
356 * @param cp peer record to update
357 * @param atsi transport performance data
360 update_atsi (struct GSF_ConnectedPeer *cp,
361 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
363 struct GNUNET_TIME_Relative latency;
365 latency = get_latency (atsi);
366 GNUNET_LOAD_value_set_decline (cp->ppd.transmission_delay, latency);
367 /* LATER: merge atsi into cp's performance data (if we ever care...) */
372 * Return the performance data record for the given peer
374 * @param cp peer to query
375 * @return performance data record for the peer
377 struct GSF_PeerPerformanceData *
378 GSF_get_peer_performance_data_ (struct GSF_ConnectedPeer *cp)
385 * Core is ready to transmit to a peer, get the message.
387 * @param cls the 'struct GSF_PeerTransmitHandle' of the message
388 * @param size number of bytes core is willing to take
389 * @param buf where to copy the message
390 * @return number of bytes copied to buf
393 peer_transmit_ready_cb (void *cls, size_t size, void *buf);
399 * Function called by core upon success or failure of our bandwidth reservation request.
401 * @param cls the 'struct GSF_ConnectedPeer' of the peer for which we made the request
402 * @param peer identifies the peer
403 * @param bandwidth_out available amount of outbound bandwidth
404 * @param amount set to the amount that was actually reserved or unreserved;
405 * either the full requested amount or zero (no partial reservations)
406 * @param res_delay if the reservation could not be satisfied (amount was 0), how
407 * long should the client wait until re-trying?
408 * @param preference current traffic preference for the given peer
411 core_reserve_callback (void *cls, const struct GNUNET_PeerIdentity *peer,
412 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
413 int32_t amount, struct GNUNET_TIME_Relative res_delay,
414 uint64_t preference);
418 * If ready (bandwidth reserved), try to schedule transmission via
419 * core for the given handle.
421 * @param pth transmission handle to schedule
424 schedule_transmission (struct GSF_PeerTransmitHandle *pth)
426 struct GSF_ConnectedPeer *cp;
427 struct GNUNET_PeerIdentity target;
430 if ((NULL != pth->cth) || (0 != pth->cth_in_progress))
431 return; /* already done */
433 GNUNET_assert (0 != cp->ppd.pid);
434 GNUNET_PEER_resolve (cp->ppd.pid, &target);
435 if ((GNUNET_YES == pth->is_query) && (GNUNET_YES != pth->was_reserved))
437 /* query, need reservation */
438 if (GNUNET_YES != cp->did_reserve)
439 return; /* not ready */
440 cp->did_reserve = GNUNET_NO;
441 /* reservation already done! */
442 pth->was_reserved = GNUNET_YES;
443 ip = cp->inc_preference;
444 cp->inc_preference = 0;
446 GNUNET_CORE_peer_change_preference (GSF_core, &target,
447 GNUNET_TIME_UNIT_FOREVER_REL,
448 GNUNET_BANDWIDTH_VALUE_MAX,
450 &core_reserve_callback, cp);
452 GNUNET_assert (pth->cth == NULL);
453 pth->cth_in_progress++;
455 GNUNET_CORE_notify_transmit_ready (GSF_core, GNUNET_YES, pth->priority,
456 GNUNET_TIME_absolute_get_remaining
457 (pth->timeout), &target, pth->size,
458 &peer_transmit_ready_cb, pth);
459 GNUNET_assert (0 < pth->cth_in_progress--);
464 * Core is ready to transmit to a peer, get the message.
466 * @param cls the 'struct GSF_PeerTransmitHandle' of the message
467 * @param size number of bytes core is willing to take
468 * @param buf where to copy the message
469 * @return number of bytes copied to buf
472 peer_transmit_ready_cb (void *cls, size_t size, void *buf)
474 struct GSF_PeerTransmitHandle *pth = cls;
475 struct GSF_PeerTransmitHandle *pos;
476 struct GSF_ConnectedPeer *cp;
479 GNUNET_assert ((NULL == buf) || (pth->size <= size));
481 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
483 GNUNET_SCHEDULER_cancel (pth->timeout_task);
484 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
487 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
488 if (GNUNET_YES == pth->is_query)
490 cp->ppd.last_request_times[(cp->last_request_times_off++) %
491 MAX_QUEUE_PER_PEER] =
492 GNUNET_TIME_absolute_get ();
493 GNUNET_assert (0 < cp->ppd.pending_queries--);
495 else if (GNUNET_NO == pth->is_query)
497 GNUNET_assert (0 < cp->ppd.pending_replies--);
499 GNUNET_LOAD_update (cp->ppd.transmission_delay,
500 GNUNET_TIME_absolute_get_duration
501 (pth->transmission_request_start_time).rel_value);
502 ret = pth->gmc (pth->gmc_cls, size, buf);
503 GNUNET_assert (NULL == pth->cth);
504 for (pos = cp->pth_head; pos != NULL; pos = pos->next)
506 GNUNET_assert (pos != pth);
507 schedule_transmission (pos);
509 GNUNET_assert (pth->cth == NULL);
510 GNUNET_assert (pth->cth_in_progress == 0);
517 * (re)try to reserve bandwidth from the given peer.
519 * @param cls the 'struct GSF_ConnectedPeer' to reserve from
520 * @param tc scheduler context
523 retry_reservation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
525 struct GSF_ConnectedPeer *cp = cls;
527 struct GNUNET_PeerIdentity target;
529 GNUNET_PEER_resolve (cp->ppd.pid, &target);
530 cp->irc_delay_task = GNUNET_SCHEDULER_NO_TASK;
531 ip = cp->inc_preference;
532 cp->inc_preference = 0;
534 GNUNET_CORE_peer_change_preference (GSF_core, &target,
535 GNUNET_TIME_UNIT_FOREVER_REL,
536 GNUNET_BANDWIDTH_VALUE_MAX,
538 &core_reserve_callback, cp);
543 * Function called by core upon success or failure of our bandwidth reservation request.
545 * @param cls the 'struct GSF_ConnectedPeer' of the peer for which we made the request
546 * @param peer identifies the peer
547 * @param bandwidth_out available amount of outbound bandwidth
548 * @param amount set to the amount that was actually reserved or unreserved;
549 * either the full requested amount or zero (no partial reservations)
550 * @param res_delay if the reservation could not be satisfied (amount was 0), how
551 * long should the client wait until re-trying?
552 * @param preference current traffic preference for the given peer
555 core_reserve_callback (void *cls, const struct GNUNET_PeerIdentity *peer,
556 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
557 int32_t amount, struct GNUNET_TIME_Relative res_delay,
560 struct GSF_ConnectedPeer *cp = cls;
561 struct GSF_PeerTransmitHandle *pth;
567 GNUNET_SCHEDULER_add_delayed (res_delay, &retry_reservation, cp);
570 cp->did_reserve = GNUNET_YES;
572 if ((NULL != pth) && (NULL == pth->cth))
574 /* reservation success, try transmission now! */
575 pth->cth_in_progress++;
577 GNUNET_CORE_notify_transmit_ready (GSF_core, GNUNET_YES, pth->priority,
578 GNUNET_TIME_absolute_get_remaining
579 (pth->timeout), peer, pth->size,
580 &peer_transmit_ready_cb, pth);
581 GNUNET_assert (0 < pth->cth_in_progress--);
587 * A peer connected to us. Setup the connected peer
590 * @param peer identity of peer that connected
591 * @param atsi performance data for the connection
592 * @return handle to connected peer entry
594 struct GSF_ConnectedPeer *
595 GSF_peer_connect_handler_ (const struct GNUNET_PeerIdentity *peer,
596 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
598 struct GSF_ConnectedPeer *cp;
602 cp = GNUNET_malloc (sizeof (struct GSF_ConnectedPeer));
603 cp->ppd.pid = GNUNET_PEER_intern (peer);
604 cp->ppd.transmission_delay = GNUNET_LOAD_value_init (GNUNET_TIME_UNIT_ZERO);
606 GNUNET_CORE_peer_change_preference (GSF_core, peer,
607 GNUNET_TIME_UNIT_FOREVER_REL,
608 GNUNET_BANDWIDTH_VALUE_MAX,
610 &core_reserve_callback, cp);
611 fn = get_trust_filename (peer);
612 if ((GNUNET_DISK_file_test (fn) == GNUNET_YES) &&
613 (sizeof (trust) == GNUNET_DISK_fn_read (fn, &trust, sizeof (trust))))
614 cp->disk_trust = cp->ppd.trust = ntohl (trust);
616 cp->request_map = GNUNET_CONTAINER_multihashmap_create (128);
617 GNUNET_break (GNUNET_OK ==
618 GNUNET_CONTAINER_multihashmap_put (cp_map, &peer->hashPubKey,
620 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
621 update_atsi (cp, atsi);
622 GSF_push_start_ (cp);
628 * It may be time to re-start migrating content to this
629 * peer. Check, and if so, restart migration.
631 * @param cls the 'struct GSF_ConnectedPeer'
632 * @param tc scheduler context
635 revive_migration (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
637 struct GSF_ConnectedPeer *cp = cls;
638 struct GNUNET_TIME_Relative bt;
640 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
641 bt = GNUNET_TIME_absolute_get_remaining (cp->ppd.migration_blocked_until);
642 if (0 != bt.rel_value)
644 /* still time left... */
645 cp->mig_revive_task =
646 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
649 GSF_push_start_ (cp);
654 * Get a handle for a connected peer.
656 * @param peer peer's identity
657 * @return NULL if the peer is not currently connected
659 struct GSF_ConnectedPeer *
660 GSF_peer_get_ (const struct GNUNET_PeerIdentity *peer)
664 return GNUNET_CONTAINER_multihashmap_get (cp_map, &peer->hashPubKey);
669 * Handle P2P "MIGRATION_STOP" message.
671 * @param cls closure, always NULL
672 * @param other the other peer involved (sender or receiver, NULL
673 * for loopback messages where we are both sender and receiver)
674 * @param message the actual message
675 * @param atsi performance information
676 * @return GNUNET_OK to keep the connection open,
677 * GNUNET_SYSERR to close it (signal serious error)
680 GSF_handle_p2p_migration_stop_ (void *cls,
681 const struct GNUNET_PeerIdentity *other,
682 const struct GNUNET_MessageHeader *message,
683 const struct GNUNET_TRANSPORT_ATS_Information
686 struct GSF_ConnectedPeer *cp;
687 const struct MigrationStopMessage *msm;
688 struct GNUNET_TIME_Relative bt;
690 msm = (const struct MigrationStopMessage *) message;
691 cp = GNUNET_CONTAINER_multihashmap_get (cp_map, &other->hashPubKey);
697 bt = GNUNET_TIME_relative_ntoh (msm->duration);
698 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
699 _("Migration of content to peer `%s' blocked for %llu ms\n"),
700 GNUNET_i2s (other), (unsigned long long) bt.rel_value);
701 cp->ppd.migration_blocked_until = GNUNET_TIME_relative_to_absolute (bt);
702 if (cp->mig_revive_task == GNUNET_SCHEDULER_NO_TASK)
705 cp->mig_revive_task =
706 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
708 update_atsi (cp, atsi);
714 * Copy reply and free put message.
716 * @param cls the 'struct PutMessage'
717 * @param buf_size number of bytes available in buf
718 * @param buf where to copy the message, NULL on error (peer disconnect)
719 * @return number of bytes copied to 'buf', can be 0 (without indicating an error)
722 copy_reply (void *cls, size_t buf_size, void *buf)
724 struct PutMessage *pm = cls;
729 GNUNET_assert (buf_size >= ntohs (pm->header.size));
730 size = ntohs (pm->header.size);
731 memcpy (buf, pm, size);
732 GNUNET_STATISTICS_update (GSF_stats,
734 ("# replies transmitted to other peers"), 1,
740 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# replies dropped"), 1,
749 * Cancel all requests associated with the peer.
752 * @param query hash code of the request
753 * @param value the 'struct GSF_PendingRequest'
754 * @return GNUNET_YES (continue to iterate)
757 cancel_pending_request (void *cls, const GNUNET_HashCode * query, void *value)
759 struct PeerRequest *peerreq = value;
760 struct GSF_PendingRequest *pr = peerreq->pr;
761 struct GSF_ConnectedPeer *cp = peerreq->cp;
762 struct GSF_PendingRequestData *prd;
764 if (peerreq->kill_task != GNUNET_SCHEDULER_NO_TASK)
766 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
767 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
769 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
771 prd = GSF_pending_request_get_data_ (pr);
772 GNUNET_break (GNUNET_YES ==
773 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
774 &prd->query, peerreq));
775 GSF_pending_request_cancel_ (pr, GNUNET_NO);
776 GNUNET_free (peerreq);
782 * Free the given request.
784 * @param cls the request to free
785 * @param tc task context
788 peer_request_destroy (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
790 struct PeerRequest *peerreq = cls;
791 struct GSF_PendingRequest *pr = peerreq->pr;
792 struct GSF_PendingRequestData *prd;
794 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
795 prd = GSF_pending_request_get_data_ (pr);
796 cancel_pending_request (NULL, &prd->query, peerreq);
801 * The artificial delay is over, transmit the message now.
803 * @param cls the 'struct GSF_DelayedHandle' with the message
804 * @param tc scheduler context
807 transmit_delayed_now (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
809 struct GSF_DelayedHandle *dh = cls;
810 struct GSF_ConnectedPeer *cp = dh->cp;
812 GNUNET_CONTAINER_DLL_remove (cp->delayed_head, cp->delayed_tail, dh);
813 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
815 GNUNET_free (dh->pm);
819 (void) GSF_peer_transmit_ (cp, GNUNET_NO, UINT32_MAX, REPLY_TIMEOUT,
820 dh->msize, ©_reply, dh->pm);
826 * Get the randomized delay a response should be subjected to.
828 * @return desired delay
830 static struct GNUNET_TIME_Relative
831 get_randomized_delay ()
833 struct GNUNET_TIME_Relative ret;
835 /* FIXME: replace 5000 with something relating to current observed P2P message latency */
837 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
838 GNUNET_CRYPTO_random_u32
839 (GNUNET_CRYPTO_QUALITY_WEAK, 5000));
840 GNUNET_STATISTICS_update (GSF_stats,
842 ("# artificial delays introduced (ms)"),
843 ret.rel_value, GNUNET_NO);
850 * Handle a reply to a pending request. Also called if a request
851 * expires (then with data == NULL). The handler may be called
852 * many times (depending on the request type), but will not be
853 * called during or after a call to GSF_pending_request_cancel
854 * and will also not be called anymore after a call signalling
857 * @param cls 'struct PeerRequest' this is an answer for
858 * @param eval evaluation of the result
859 * @param pr handle to the original pending request
860 * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
861 * @param expiration when does 'data' expire?
862 * @param type type of the block
863 * @param data response data, NULL on request expiration
864 * @param data_len number of bytes in data
867 handle_p2p_reply (void *cls, enum GNUNET_BLOCK_EvaluationResult eval,
868 struct GSF_PendingRequest *pr, uint32_t reply_anonymity_level,
869 struct GNUNET_TIME_Absolute expiration,
870 enum GNUNET_BLOCK_Type type, const void *data,
873 struct PeerRequest *peerreq = cls;
874 struct GSF_ConnectedPeer *cp = peerreq->cp;
875 struct GSF_PendingRequestData *prd;
876 struct PutMessage *pm;
879 GNUNET_assert (data_len + sizeof (struct PutMessage) <
880 GNUNET_SERVER_MAX_MESSAGE_SIZE);
881 GNUNET_assert (peerreq->pr == pr);
882 prd = GSF_pending_request_get_data_ (pr);
885 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
887 GNUNET_break (GNUNET_YES ==
888 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
889 &prd->query, peerreq));
890 GNUNET_free (peerreq);
893 GNUNET_break (type != GNUNET_BLOCK_TYPE_ANY);
894 if ((prd->type != type) && (prd->type != GNUNET_BLOCK_TYPE_ANY))
900 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
901 "Transmitting result for query `%s' to peer\n",
902 GNUNET_h2s (&prd->query));
904 GNUNET_STATISTICS_update (GSF_stats,
905 gettext_noop ("# replies received for other peers"),
907 msize = sizeof (struct PutMessage) + data_len;
908 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
913 if ((reply_anonymity_level != UINT32_MAX) && (reply_anonymity_level > 1))
915 if (reply_anonymity_level - 1 > GSF_cover_content_count)
917 GNUNET_STATISTICS_update (GSF_stats,
919 ("# replies dropped due to insufficient cover traffic"),
923 GSF_cover_content_count -= (reply_anonymity_level - 1);
926 pm = GNUNET_malloc (msize);
927 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
928 pm->header.size = htons (msize);
929 pm->type = htonl (type);
930 pm->expiration = GNUNET_TIME_absolute_hton (expiration);
931 memcpy (&pm[1], data, data_len);
932 if ((reply_anonymity_level != UINT32_MAX) && (reply_anonymity_level != 0) &&
933 (GSF_enable_randomized_delays == GNUNET_YES))
935 struct GSF_DelayedHandle *dh;
937 dh = GNUNET_malloc (sizeof (struct GSF_DelayedHandle));
941 GNUNET_CONTAINER_DLL_insert (cp->delayed_head, cp->delayed_tail, dh);
943 GNUNET_SCHEDULER_add_delayed (get_randomized_delay (),
944 &transmit_delayed_now, dh);
948 (void) GSF_peer_transmit_ (cp, GNUNET_NO, UINT32_MAX, REPLY_TIMEOUT, msize,
951 if (eval != GNUNET_BLOCK_EVALUATION_OK_LAST)
953 if (GNUNET_SCHEDULER_NO_TASK == peerreq->kill_task)
955 GNUNET_STATISTICS_update (GSF_stats,
957 ("# P2P searches destroyed due to ultimate reply"),
960 GNUNET_SCHEDULER_add_now (&peer_request_destroy, peerreq);
966 * Increase the host credit by a value.
968 * @param cp which peer to change the trust value on
969 * @param value is the int value by which the
970 * host credit is to be increased or decreased
971 * @returns the actual change in trust (positive or negative)
974 change_host_trust (struct GSF_ConnectedPeer *cp, int value)
978 GNUNET_assert (cp != NULL);
981 if (cp->ppd.trust + value < cp->ppd.trust)
983 value = UINT32_MAX - cp->ppd.trust;
984 cp->ppd.trust = UINT32_MAX;
987 cp->ppd.trust += value;
991 if (cp->ppd.trust < -value)
993 value = -cp->ppd.trust;
997 cp->ppd.trust += value;
1004 * We've received a request with the specified priority. Bound it
1005 * according to how much we trust the given peer.
1007 * @param prio_in requested priority
1008 * @param cp the peer making the request
1009 * @return effective priority
1012 bound_priority (uint32_t prio_in, struct GSF_ConnectedPeer *cp)
1014 #define N ((double)128.0)
1019 ld = GSF_test_get_load_too_high_ (0);
1020 if (ld == GNUNET_SYSERR)
1022 GNUNET_STATISTICS_update (GSF_stats,
1024 ("# requests done for free (low load)"), 1,
1026 return 0; /* excess resources */
1028 if (prio_in > INT32_MAX)
1029 prio_in = INT32_MAX;
1030 ret = -change_host_trust (cp, -(int) prio_in);
1033 if (ret > GSF_current_priorities + N)
1034 rret = GSF_current_priorities + N;
1037 GSF_current_priorities = (GSF_current_priorities * (N - 1) + rret) / N;
1039 if ((ld == GNUNET_YES) && (ret > 0))
1041 /* try with charging */
1042 ld = GSF_test_get_load_too_high_ (ret);
1044 if (ld == GNUNET_YES)
1046 GNUNET_STATISTICS_update (GSF_stats,
1048 ("# request dropped, priority insufficient"), 1,
1051 change_host_trust (cp, (int) ret);
1052 return -1; /* not enough resources */
1056 GNUNET_STATISTICS_update (GSF_stats,
1058 ("# requests done for a price (normal load)"), 1,
1067 * The priority level imposes a bound on the maximum
1068 * value for the ttl that can be requested.
1070 * @param ttl_in requested ttl
1071 * @param prio given priority
1072 * @return ttl_in if ttl_in is below the limit,
1073 * otherwise the ttl-limit for the given priority
1076 bound_ttl (int32_t ttl_in, uint32_t prio)
1078 unsigned long long allowed;
1082 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
1083 if (ttl_in > allowed)
1085 if (allowed >= (1 << 30))
1094 * Handle P2P "QUERY" message. Creates the pending request entry
1095 * and sets up all of the data structures to that we will
1096 * process replies properly. Does not initiate forwarding or
1097 * local database lookups.
1099 * @param other the other peer involved (sender or receiver, NULL
1100 * for loopback messages where we are both sender and receiver)
1101 * @param message the actual message
1102 * @return pending request handle, NULL on error
1104 struct GSF_PendingRequest *
1105 GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
1106 const struct GNUNET_MessageHeader *message)
1108 struct PeerRequest *peerreq;
1109 struct GSF_PendingRequest *pr;
1110 struct GSF_PendingRequestData *prd;
1111 struct GSF_ConnectedPeer *cp;
1112 struct GSF_ConnectedPeer *cps;
1113 const GNUNET_HashCode *namespace;
1114 const struct GNUNET_PeerIdentity *target;
1115 enum GSF_PendingRequestOptions options;
1117 const struct GetMessage *gm;
1119 const GNUNET_HashCode *opt;
1122 uint32_t ttl_decrement;
1125 enum GNUNET_BLOCK_Type type;
1126 GNUNET_PEER_Id spid;
1128 GNUNET_assert (other != NULL);
1129 msize = ntohs (message->size);
1130 if (msize < sizeof (struct GetMessage))
1132 GNUNET_break_op (0);
1135 GNUNET_STATISTICS_update (GSF_stats,
1137 ("# GET requests received (from other peers)"), 1,
1139 gm = (const struct GetMessage *) message;
1140 type = ntohl (gm->type);
1141 bm = ntohl (gm->hash_bitmap);
1149 if (msize < sizeof (struct GetMessage) + bits * sizeof (GNUNET_HashCode))
1151 GNUNET_break_op (0);
1154 opt = (const GNUNET_HashCode *) &gm[1];
1155 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (GNUNET_HashCode);
1156 /* bfsize must be power of 2, check! */
1157 if (0 != ((bfsize - 1) & bfsize))
1159 GNUNET_break_op (0);
1162 GSF_cover_query_count++;
1163 bm = ntohl (gm->hash_bitmap);
1165 cps = GNUNET_CONTAINER_multihashmap_get (cp_map, &other->hashPubKey);
1168 /* peer must have just disconnected */
1169 GNUNET_STATISTICS_update (GSF_stats,
1171 ("# requests dropped due to initiator not being connected"),
1175 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1176 cp = GNUNET_CONTAINER_multihashmap_get (cp_map, &opt[bits++]);
1182 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1183 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1184 "Failed to find RETURN-TO peer `%4s' in connection set. Dropping query.\n",
1185 GNUNET_i2s ((const struct GNUNET_PeerIdentity *)
1189 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1190 "Failed to find peer `%4s' in connection set. Dropping query.\n",
1191 GNUNET_i2s (other));
1193 GNUNET_STATISTICS_update (GSF_stats,
1195 ("# requests dropped due to missing reverse route"),
1199 /* note that we can really only check load here since otherwise
1200 * peers could find out that we are overloaded by not being
1201 * disconnected after sending us a malformed query... */
1202 priority = bound_priority (ntohl (gm->priority), cps);
1206 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1207 "Dropping query from `%s', this peer is too busy.\n",
1208 GNUNET_i2s (other));
1213 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1214 "Received request for `%s' of type %u from peer `%4s' with flags %u\n",
1215 GNUNET_h2s (&gm->query), (unsigned int) type, GNUNET_i2s (other),
1218 namespace = (0 != (bm & GET_MESSAGE_BIT_SKS_NAMESPACE)) ? &opt[bits++] : NULL;
1219 if ((type == GNUNET_BLOCK_TYPE_FS_SBLOCK) && (namespace == NULL))
1221 GNUNET_break_op (0);
1224 if ((type != GNUNET_BLOCK_TYPE_FS_SBLOCK) && (namespace != NULL))
1226 GNUNET_break_op (0);
1231 (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? ((const struct GNUNET_PeerIdentity
1232 *) &opt[bits++]) : NULL;
1235 if ((GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + priority))
1236 || (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
1237 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value * 2 +
1238 GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)))
1240 /* don't have BW to send to peer, or would likely take longer than we have for it,
1241 * so at best indirect the query */
1243 options |= GSF_PRO_FORWARD_ONLY;
1244 spid = GNUNET_PEER_intern (other);
1245 GNUNET_assert (0 != spid);
1247 ttl = bound_ttl (ntohl (gm->ttl), priority);
1248 /* decrement ttl (always) */
1250 2 * TTL_DECREMENT + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1252 if ((ttl < 0) && (((int32_t) (ttl - ttl_decrement)) > 0))
1255 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1256 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
1257 GNUNET_i2s (other), ttl, ttl_decrement);
1259 GNUNET_STATISTICS_update (GSF_stats,
1261 ("# requests dropped due TTL underflow"), 1,
1263 /* integer underflow => drop (should be very rare)! */
1266 ttl -= ttl_decrement;
1268 /* test if the request already exists */
1269 peerreq = GNUNET_CONTAINER_multihashmap_get (cp->request_map, &gm->query);
1270 if (peerreq != NULL)
1273 prd = GSF_pending_request_get_data_ (pr);
1274 if ((prd->type == type) &&
1275 ((type != GNUNET_BLOCK_TYPE_FS_SBLOCK) ||
1276 (0 == memcmp (&prd->namespace, namespace, sizeof (GNUNET_HashCode)))))
1278 if (prd->ttl.abs_value >= GNUNET_TIME_absolute_get ().abs_value + ttl)
1280 /* existing request has higher TTL, drop new one! */
1281 prd->priority += priority;
1283 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1284 "Have existing request with higher TTL, dropping new request.\n",
1285 GNUNET_i2s (other));
1287 GNUNET_STATISTICS_update (GSF_stats,
1289 ("# requests dropped due to higher-TTL request"),
1293 /* existing request has lower TTL, drop old one! */
1294 GNUNET_STATISTICS_update (GSF_stats,
1295 gettext_noop ("# P2P searches active"), -1,
1297 priority += prd->priority;
1298 GSF_pending_request_cancel_ (pr, GNUNET_YES);
1299 GNUNET_assert (GNUNET_YES ==
1300 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
1303 if (peerreq->kill_task != GNUNET_SCHEDULER_NO_TASK)
1305 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
1306 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
1308 GNUNET_free (peerreq);
1312 peerreq = GNUNET_malloc (sizeof (struct PeerRequest));
1314 pr = GSF_pending_request_create_ (options, type, &gm->query, namespace,
1317 0) ? (const char *) &opt[bits] : NULL,
1318 bfsize, ntohl (gm->filter_mutator),
1320 (uint32_t) priority, ttl, spid, NULL, 0, /* replies_seen */
1321 &handle_p2p_reply, peerreq);
1322 GNUNET_assert (NULL != pr);
1324 GNUNET_break (GNUNET_OK ==
1325 GNUNET_CONTAINER_multihashmap_put (cp->request_map, &gm->query,
1327 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1328 GNUNET_STATISTICS_update (GSF_stats,
1330 ("# P2P query messages received and processed"), 1,
1332 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
1339 * Function called if there has been a timeout trying to satisfy
1340 * a transmission request.
1342 * @param cls the 'struct GSF_PeerTransmitHandle' of the request
1343 * @param tc scheduler context
1346 peer_transmit_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1348 struct GSF_PeerTransmitHandle *pth = cls;
1349 struct GSF_ConnectedPeer *cp;
1352 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1353 "Timeout trying to transmit to other peer\n");
1355 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1357 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1358 if (GNUNET_YES == pth->is_query)
1359 GNUNET_assert (0 < cp->ppd.pending_queries--);
1360 else if (GNUNET_NO == pth->is_query)
1361 GNUNET_assert (0 < cp->ppd.pending_replies--);
1362 GNUNET_LOAD_update (cp->ppd.transmission_delay, UINT64_MAX);
1363 if (NULL != pth->cth)
1365 GNUNET_CORE_notify_transmit_ready_cancel (pth->cth);
1368 pth->gmc (pth->gmc_cls, 0, NULL);
1369 GNUNET_assert (0 == pth->cth_in_progress);
1375 * Transmit a message to the given peer as soon as possible.
1376 * If the peer disconnects before the transmission can happen,
1377 * the callback is invoked with a 'NULL' buffer.
1379 * @param cp target peer
1380 * @param is_query is this a query (GNUNET_YES) or content (GNUNET_NO) or neither (GNUNET_SYSERR)
1381 * @param priority how important is this request?
1382 * @param timeout when does this request timeout (call gmc with error)
1383 * @param size number of bytes we would like to send to the peer
1384 * @param gmc function to call to get the message
1385 * @param gmc_cls closure for gmc
1386 * @return handle to cancel request
1388 struct GSF_PeerTransmitHandle *
1389 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp, int is_query,
1390 uint32_t priority, struct GNUNET_TIME_Relative timeout,
1391 size_t size, GSF_GetMessageCallback gmc, void *gmc_cls)
1393 struct GSF_PeerTransmitHandle *pth;
1394 struct GSF_PeerTransmitHandle *pos;
1395 struct GSF_PeerTransmitHandle *prev;
1397 pth = GNUNET_malloc (sizeof (struct GSF_PeerTransmitHandle));
1398 pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
1399 pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1401 pth->gmc_cls = gmc_cls;
1403 pth->is_query = is_query;
1404 pth->priority = priority;
1406 /* insertion sort (by priority, descending) */
1409 while ((pos != NULL) && (pos->priority > priority))
1415 GNUNET_CONTAINER_DLL_insert (cp->pth_head, cp->pth_tail, pth);
1417 GNUNET_CONTAINER_DLL_insert_after (cp->pth_head, cp->pth_tail, prev, pth);
1418 if (GNUNET_YES == is_query)
1419 cp->ppd.pending_queries++;
1420 else if (GNUNET_NO == is_query)
1421 cp->ppd.pending_replies++;
1423 GNUNET_SCHEDULER_add_delayed (timeout, &peer_transmit_timeout, pth);
1424 schedule_transmission (pth);
1430 * Cancel an earlier request for transmission.
1432 * @param pth request to cancel
1435 GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
1437 struct GSF_ConnectedPeer *cp;
1439 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1441 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1442 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1444 if (NULL != pth->cth)
1446 GNUNET_CORE_notify_transmit_ready_cancel (pth->cth);
1450 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1451 if (GNUNET_YES == pth->is_query)
1452 GNUNET_assert (0 < cp->ppd.pending_queries--);
1453 else if (GNUNET_NO == pth->is_query)
1454 GNUNET_assert (0 < cp->ppd.pending_replies--);
1455 GNUNET_assert (0 == pth->cth_in_progress);
1461 * Report on receiving a reply; update the performance record of the given peer.
1463 * @param cp responding peer (will be updated)
1464 * @param request_time time at which the original query was transmitted
1465 * @param request_priority priority of the original request
1468 GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
1469 struct GNUNET_TIME_Absolute request_time,
1470 uint32_t request_priority)
1472 struct GNUNET_TIME_Relative delay;
1474 delay = GNUNET_TIME_absolute_get_duration (request_time);
1475 cp->ppd.avg_reply_delay.rel_value =
1476 (cp->ppd.avg_reply_delay.rel_value * (RUNAVG_DELAY_N - 1) +
1477 delay.rel_value) / RUNAVG_DELAY_N;
1478 cp->ppd.avg_priority =
1479 (cp->ppd.avg_priority * (RUNAVG_DELAY_N - 1) +
1480 request_priority) / RUNAVG_DELAY_N;
1485 * Report on receiving a reply in response to an initiating client.
1486 * Remember that this peer is good for this client.
1488 * @param cp responding peer (will be updated)
1489 * @param initiator_client local client on responsible for query
1492 GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
1493 struct GSF_LocalClient *initiator_client)
1495 cp->ppd.last_client_replies[cp->last_client_replies_woff++ %
1496 CS2P_SUCCESS_LIST_SIZE] = initiator_client;
1501 * Report on receiving a reply in response to an initiating peer.
1502 * Remember that this peer is good for this initiating peer.
1504 * @param cp responding peer (will be updated)
1505 * @param initiator_peer other peer responsible for query
1508 GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
1509 const struct GSF_ConnectedPeer *initiator_peer)
1513 woff = cp->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE;
1514 GNUNET_PEER_change_rc (cp->ppd.last_p2p_replies[woff], -1);
1515 cp->ppd.last_p2p_replies[woff] = initiator_peer->ppd.pid;
1516 GNUNET_PEER_change_rc (initiator_peer->ppd.pid, 1);
1517 cp->last_p2p_replies_woff = (woff + 1) % P2P_SUCCESS_LIST_SIZE;
1522 * Method called whenever a given peer has a status change.
1524 * @param cls closure
1525 * @param peer peer identity this notification is about
1526 * @param bandwidth_in available amount of inbound bandwidth
1527 * @param bandwidth_out available amount of outbound bandwidth
1528 * @param timeout absolute time when this peer will time out
1529 * unless we see some further activity from it
1530 * @param atsi status information
1533 GSF_peer_status_handler_ (void *cls, const struct GNUNET_PeerIdentity *peer,
1534 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
1535 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
1536 struct GNUNET_TIME_Absolute timeout,
1537 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1539 struct GSF_ConnectedPeer *cp;
1541 cp = GNUNET_CONTAINER_multihashmap_get (cp_map, &peer->hashPubKey);
1542 GNUNET_assert (NULL != cp);
1543 update_atsi (cp, atsi);
1548 * A peer disconnected from us. Tear down the connected peer
1552 * @param peer identity of peer that connected
1555 GSF_peer_disconnect_handler_ (void *cls, const struct GNUNET_PeerIdentity *peer)
1557 struct GSF_ConnectedPeer *cp;
1558 struct GSF_PeerTransmitHandle *pth;
1559 struct GSF_DelayedHandle *dh;
1561 cp = GNUNET_CONTAINER_multihashmap_get (cp_map, &peer->hashPubKey);
1563 return; /* must have been disconnect from core with
1564 * 'peer' == my_id, ignore */
1565 GNUNET_assert (GNUNET_YES ==
1566 GNUNET_CONTAINER_multihashmap_remove (cp_map,
1567 &peer->hashPubKey, cp));
1568 if (NULL != cp->migration_pth)
1570 GSF_peer_transmit_cancel_ (cp->migration_pth);
1571 cp->migration_pth = NULL;
1573 if (NULL != cp->irc)
1575 GNUNET_CORE_peer_change_preference_cancel (cp->irc);
1578 if (GNUNET_SCHEDULER_NO_TASK != cp->irc_delay_task)
1580 GNUNET_SCHEDULER_cancel (cp->irc_delay_task);
1581 cp->irc_delay_task = GNUNET_SCHEDULER_NO_TASK;
1583 GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
1584 &cancel_pending_request, cp);
1585 GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
1586 cp->request_map = NULL;
1587 GSF_plan_notify_peer_disconnect_ (cp);
1588 GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
1589 GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
1590 memset (cp->ppd.last_p2p_replies, 0, sizeof (cp->ppd.last_p2p_replies));
1591 GSF_push_stop_ (cp);
1592 while (NULL != (pth = cp->pth_head))
1594 if (NULL != pth->cth)
1596 GNUNET_CORE_notify_transmit_ready_cancel (pth->cth);
1599 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1601 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1602 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1604 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1605 GNUNET_assert (0 == pth->cth_in_progress);
1606 pth->gmc (pth->gmc_cls, 0, NULL);
1609 while (NULL != (dh = cp->delayed_head))
1611 GNUNET_CONTAINER_DLL_remove (cp->delayed_head, cp->delayed_tail, dh);
1612 GNUNET_SCHEDULER_cancel (dh->delay_task);
1613 GNUNET_free (dh->pm);
1616 GNUNET_PEER_change_rc (cp->ppd.pid, -1);
1617 if (GNUNET_SCHEDULER_NO_TASK != cp->mig_revive_task)
1619 GNUNET_SCHEDULER_cancel (cp->mig_revive_task);
1620 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
1627 * Closure for 'call_iterator'.
1629 struct IterationContext
1632 * Function to call on each entry.
1634 GSF_ConnectedPeerIterator it;
1644 * Function that calls the callback for each peer.
1646 * @param cls the 'struct IterationContext*'
1647 * @param key identity of the peer
1648 * @param value the 'struct GSF_ConnectedPeer*'
1649 * @return GNUNET_YES to continue iteration
1652 call_iterator (void *cls, const GNUNET_HashCode * key, void *value)
1654 struct IterationContext *ic = cls;
1655 struct GSF_ConnectedPeer *cp = value;
1657 ic->it (ic->it_cls, (const struct GNUNET_PeerIdentity *) key, cp, &cp->ppd);
1663 * Iterate over all connected peers.
1665 * @param it function to call for each peer
1666 * @param it_cls closure for it
1669 GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it, void *it_cls)
1671 struct IterationContext ic;
1675 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &call_iterator, &ic);
1680 * Obtain the identity of a connected peer.
1682 * @param cp peer to reserve bandwidth from
1683 * @param id identity to set (written to)
1686 GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
1687 struct GNUNET_PeerIdentity *id)
1689 GNUNET_assert (0 != cp->ppd.pid);
1690 GNUNET_PEER_resolve (cp->ppd.pid, id);
1695 * Assemble a migration stop message for transmission.
1697 * @param cls the 'struct GSF_ConnectedPeer' to use
1698 * @param size number of bytes we're allowed to write to buf
1699 * @param buf where to copy the message
1700 * @return number of bytes copied to buf
1703 create_migration_stop_message (void *cls, size_t size, void *buf)
1705 struct GSF_ConnectedPeer *cp = cls;
1706 struct MigrationStopMessage msm;
1708 cp->migration_pth = NULL;
1711 GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
1712 msm.header.size = htons (sizeof (struct MigrationStopMessage));
1713 msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
1714 msm.reserved = htonl (0);
1716 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
1717 (cp->last_migration_block));
1718 memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
1719 return sizeof (struct MigrationStopMessage);
1724 * Ask a peer to stop migrating data to us until the given point
1727 * @param cp peer to ask
1728 * @param block_time until when to block
1731 GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
1732 struct GNUNET_TIME_Relative block_time)
1734 if (GNUNET_TIME_absolute_get_remaining (cp->last_migration_block).rel_value >
1735 block_time.rel_value)
1738 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1739 "Migration already blocked for another %llu ms\n",
1740 (unsigned long long)
1741 GNUNET_TIME_absolute_get_remaining
1742 (cp->last_migration_block).rel_value);
1744 return; /* already blocked */
1747 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Asking to stop migration for %llu ms\n",
1748 (unsigned long long) block_time.rel_value);
1750 cp->last_migration_block = GNUNET_TIME_relative_to_absolute (block_time);
1751 if (cp->migration_pth != NULL)
1752 GSF_peer_transmit_cancel_ (cp->migration_pth);
1754 GSF_peer_transmit_ (cp, GNUNET_SYSERR, UINT32_MAX,
1755 GNUNET_TIME_UNIT_FOREVER_REL,
1756 sizeof (struct MigrationStopMessage),
1757 &create_migration_stop_message, cp);
1762 * Write host-trust information to a file - flush the buffer entry!
1764 * @param cls closure, not used
1765 * @param key host identity
1766 * @param value the 'struct GSF_ConnectedPeer' to flush
1767 * @return GNUNET_OK to continue iteration
1770 flush_trust (void *cls, const GNUNET_HashCode * key, void *value)
1772 struct GSF_ConnectedPeer *cp = value;
1775 struct GNUNET_PeerIdentity pid;
1777 if (cp->ppd.trust == cp->disk_trust)
1778 return GNUNET_OK; /* unchanged */
1779 GNUNET_assert (0 != cp->ppd.pid);
1780 GNUNET_PEER_resolve (cp->ppd.pid, &pid);
1781 fn = get_trust_filename (&pid);
1782 if (cp->ppd.trust == 0)
1784 if ((0 != UNLINK (fn)) && (errno != ENOENT))
1785 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING |
1786 GNUNET_ERROR_TYPE_BULK, "unlink", fn);
1790 trust = htonl (cp->ppd.trust);
1791 if (sizeof (uint32_t) ==
1792 GNUNET_DISK_fn_write (fn, &trust, sizeof (uint32_t),
1793 GNUNET_DISK_PERM_USER_READ |
1794 GNUNET_DISK_PERM_USER_WRITE |
1795 GNUNET_DISK_PERM_GROUP_READ |
1796 GNUNET_DISK_PERM_OTHER_READ))
1797 cp->disk_trust = cp->ppd.trust;
1805 * Notify core about a preference we have for the given peer
1806 * (to allocate more resources towards it). The change will
1807 * be communicated the next time we reserve bandwidth with
1808 * core (not instantly).
1810 * @param cp peer to reserve bandwidth from
1811 * @param pref preference change
1814 GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
1817 cp->inc_preference += pref;
1822 * Call this method periodically to flush trust information to disk.
1824 * @param cls closure, not used
1825 * @param tc task context, not used
1828 cron_flush_trust (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1833 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &flush_trust, NULL);
1836 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1838 GNUNET_SCHEDULER_add_delayed (TRUST_FLUSH_FREQ, &cron_flush_trust, NULL);
1843 * Initialize peer management subsystem.
1846 GSF_connected_peer_init_ ()
1848 cp_map = GNUNET_CONTAINER_multihashmap_create (128);
1849 GNUNET_assert (GNUNET_OK ==
1850 GNUNET_CONFIGURATION_get_value_filename (GSF_cfg, "fs",
1853 GNUNET_DISK_directory_create (trustDirectory);
1854 GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
1855 &cron_flush_trust, NULL);
1860 * Iterator to free peer entries.
1862 * @param cls closure, unused
1863 * @param key current key code
1864 * @param value value in the hash map (peer entry)
1865 * @return GNUNET_YES (we should continue to iterate)
1868 clean_peer (void *cls, const GNUNET_HashCode * key, void *value)
1870 GSF_peer_disconnect_handler_ (NULL, (const struct GNUNET_PeerIdentity *) key);
1876 * Shutdown peer management subsystem.
1879 GSF_connected_peer_done_ ()
1881 cron_flush_trust (NULL, NULL);
1882 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &clean_peer, NULL);
1883 GNUNET_CONTAINER_multihashmap_destroy (cp_map);
1885 GNUNET_free (trustDirectory);
1886 trustDirectory = NULL;
1891 * Iterator to remove references to LC entry.
1893 * @param cls the 'struct GSF_LocalClient*' to look for
1894 * @param key current key code
1895 * @param value value in the hash map (peer entry)
1896 * @return GNUNET_YES (we should continue to iterate)
1899 clean_local_client (void *cls, const GNUNET_HashCode * key, void *value)
1901 const struct GSF_LocalClient *lc = cls;
1902 struct GSF_ConnectedPeer *cp = value;
1905 for (i = 0; i < CS2P_SUCCESS_LIST_SIZE; i++)
1906 if (cp->ppd.last_client_replies[i] == lc)
1907 cp->ppd.last_client_replies[i] = NULL;
1913 * Notification that a local client disconnected. Clean up all of our
1914 * references to the given handle.
1916 * @param lc handle to the local client (henceforth invalid)
1919 GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
1922 return; /* already cleaned up */
1923 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &clean_local_client,
1928 /* end of gnunet-service-fs_cp.c */