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_ats_service.h"
29 #include "gnunet-service-fs.h"
30 #include "gnunet-service-fs_cp.h"
31 #include "gnunet-service-fs_pe.h"
32 #include "gnunet-service-fs_pr.h"
33 #include "gnunet-service-fs_push.h"
36 * How often do we flush trust values to disk?
38 #define TRUST_FLUSH_FREQ GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
41 * After how long do we discard a reply?
43 #define REPLY_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
47 * Handle to cancel a transmission request.
49 struct GSF_PeerTransmitHandle
53 * Kept in a doubly-linked list.
55 struct GSF_PeerTransmitHandle *next;
58 * Kept in a doubly-linked list.
60 struct GSF_PeerTransmitHandle *prev;
63 * Handle for an active request for transmission to this
64 * peer, or NULL (if core queue was full).
66 struct GNUNET_CORE_TransmitHandle *cth;
69 * Time when this transmission request was issued.
71 struct GNUNET_TIME_Absolute transmission_request_start_time;
74 * Timeout for this request.
76 struct GNUNET_TIME_Absolute timeout;
79 * Task called on timeout, or 0 for none.
81 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
84 * Function to call to get the actual message.
86 GSF_GetMessageCallback gmc;
89 * Peer this request targets.
91 struct GSF_ConnectedPeer *cp;
99 * Size of the message to be transmitted.
104 * Set to 1 if we're currently in the process of calling
105 * 'GNUNET_CORE_notify_transmit_ready' (so while cth is
106 * NULL, we should not call notify_transmit_ready for this
109 unsigned int cth_in_progress;
112 * GNUNET_YES if this is a query, GNUNET_NO for content.
117 * Did we get a reservation already?
122 * Priority of this request.
130 * Handle for an entry in our delay list.
132 struct GSF_DelayedHandle
136 * Kept in a doubly-linked list.
138 struct GSF_DelayedHandle *next;
141 * Kept in a doubly-linked list.
143 struct GSF_DelayedHandle *prev;
146 * Peer this transmission belongs to.
148 struct GSF_ConnectedPeer *cp;
151 * The PUT that was delayed.
153 struct PutMessage *pm;
156 * Task for the delay.
158 GNUNET_SCHEDULER_TaskIdentifier delay_task;
161 * Size of the message.
169 * Information per peer and request.
175 * Handle to generic request.
177 struct GSF_PendingRequest *pr;
180 * Handle to specific peer.
182 struct GSF_ConnectedPeer *cp;
185 * Task for asynchronous stopping of this request.
187 GNUNET_SCHEDULER_TaskIdentifier kill_task;
195 struct GSF_ConnectedPeer
199 * Performance data for this peer.
201 struct GSF_PeerPerformanceData ppd;
204 * Time until when we blocked this peer from migrating
207 struct GNUNET_TIME_Absolute last_migration_block;
210 * Task scheduled to revive migration to this peer.
212 GNUNET_SCHEDULER_TaskIdentifier mig_revive_task;
215 * Messages (replies, queries, content migration) we would like to
216 * send to this peer in the near future. Sorted by priority, head.
218 struct GSF_PeerTransmitHandle *pth_head;
221 * Messages (replies, queries, content migration) we would like to
222 * send to this peer in the near future. Sorted by priority, tail.
224 struct GSF_PeerTransmitHandle *pth_tail;
227 * Messages (replies, queries, content migration) we would like to
228 * send to this peer in the near future. Sorted by priority, head.
230 struct GSF_DelayedHandle *delayed_head;
233 * Messages (replies, queries, content migration) we would like to
234 * send to this peer in the near future. Sorted by priority, tail.
236 struct GSF_DelayedHandle *delayed_tail;
239 * Migration stop message in our queue, or NULL if we have none pending.
241 struct GSF_PeerTransmitHandle *migration_pth;
244 * Context of our GNUNET_ATS_peer_change_preference call (or NULL).
246 struct GNUNET_ATS_InformationRequestContext *irc;
249 * Task scheduled if we need to retry bandwidth reservation later.
251 GNUNET_SCHEDULER_TaskIdentifier irc_delay_task;
254 * Active requests from this neighbour, map of query to 'struct PeerRequest'.
256 struct GNUNET_CONTAINER_MultiHashMap *request_map;
259 * Increase in traffic preference still to be submitted
260 * to the core service for this peer.
262 uint64_t inc_preference;
265 * Trust rating for this peer on disk.
270 * Which offset in "last_p2p_replies" will be updated next?
271 * (we go round-robin).
273 unsigned int last_p2p_replies_woff;
276 * Which offset in "last_client_replies" will be updated next?
277 * (we go round-robin).
279 unsigned int last_client_replies_woff;
282 * Current offset into 'last_request_times' ring buffer.
284 unsigned int last_request_times_off;
287 * GNUNET_YES if we did successfully reserve 32k bandwidth,
296 * Map from peer identities to 'struct GSF_ConnectPeer' entries.
298 static struct GNUNET_CONTAINER_MultiHashMap *cp_map;
301 * Where do we store trust information?
303 static char *trustDirectory;
306 * Handle to ATS service.
308 static struct GNUNET_ATS_SchedulingHandle *ats;
311 * Get the filename under which we would store the GNUNET_HELLO_Message
312 * for the given host and protocol.
313 * @return filename of the form DIRECTORY/HOSTID
316 get_trust_filename (const struct GNUNET_PeerIdentity *id)
318 struct GNUNET_CRYPTO_HashAsciiEncoded fil;
321 GNUNET_CRYPTO_hash_to_enc (&id->hashPubKey, &fil);
322 GNUNET_asprintf (&fn, "%s%s%s", trustDirectory, DIR_SEPARATOR_STR, &fil);
328 * Find latency information in 'atsi'.
330 * @param atsi performance data
331 * @return connection latency
333 static struct GNUNET_TIME_Relative
334 get_latency (const struct GNUNET_TRANSPORT_ATS_Information *atsi)
337 return GNUNET_TIME_UNIT_SECONDS;
338 while ((ntohl (atsi->type) != GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR) &&
339 (ntohl (atsi->type) != GNUNET_TRANSPORT_ATS_QUALITY_NET_DELAY))
341 if (ntohl (atsi->type) == GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR)
343 /* We sometime have no latency data, i.e. if the address came from
344 peerinfo and we never had a chance to play transport-level
345 PING/PONG yet. Assume 1s in that case. */
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);
397 * Function called by core upon success or failure of our bandwidth reservation request.
399 * @param cls the 'struct GSF_ConnectedPeer' of the peer for which we made the request
400 * @param peer identifies the peer
401 * @param amount set to the amount that was actually reserved or unreserved;
402 * either the full requested amount or zero (no partial reservations)
403 * @param res_delay if the reservation could not be satisfied (amount was 0), how
404 * long should the client wait until re-trying?
407 ats_reserve_callback (void *cls, const struct GNUNET_PeerIdentity *peer,
408 int32_t amount, struct GNUNET_TIME_Relative res_delay);
412 * If ready (bandwidth reserved), try to schedule transmission via
413 * core for the given handle.
415 * @param pth transmission handle to schedule
418 schedule_transmission (struct GSF_PeerTransmitHandle *pth)
420 struct GSF_ConnectedPeer *cp;
421 struct GNUNET_PeerIdentity target;
424 if ((NULL != pth->cth) || (0 != pth->cth_in_progress))
425 return; /* already done */
427 GNUNET_assert (0 != cp->ppd.pid);
428 GNUNET_PEER_resolve (cp->ppd.pid, &target);
429 if ((GNUNET_YES == pth->is_query) && (GNUNET_YES != pth->was_reserved))
431 /* query, need reservation */
432 if (GNUNET_YES != cp->did_reserve)
433 return; /* not ready */
434 cp->did_reserve = GNUNET_NO;
435 /* reservation already done! */
436 pth->was_reserved = GNUNET_YES;
437 ip = cp->inc_preference;
438 cp->inc_preference = 0;
440 GNUNET_ATS_peer_change_preference (ats, &target,
442 &ats_reserve_callback, cp);
444 GNUNET_assert (pth->cth == NULL);
445 pth->cth_in_progress++;
447 GNUNET_CORE_notify_transmit_ready (GSF_core, GNUNET_YES, pth->priority,
448 GNUNET_TIME_absolute_get_remaining
449 (pth->timeout), &target, pth->size,
450 &peer_transmit_ready_cb, pth);
451 GNUNET_assert (0 < pth->cth_in_progress--);
456 * Core is ready to transmit to a peer, get the message.
458 * @param cls the 'struct GSF_PeerTransmitHandle' of the message
459 * @param size number of bytes core is willing to take
460 * @param buf where to copy the message
461 * @return number of bytes copied to buf
464 peer_transmit_ready_cb (void *cls, size_t size, void *buf)
466 struct GSF_PeerTransmitHandle *pth = cls;
467 struct GSF_PeerTransmitHandle *pos;
468 struct GSF_ConnectedPeer *cp;
471 GNUNET_assert ((NULL == buf) || (pth->size <= size));
473 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
475 GNUNET_SCHEDULER_cancel (pth->timeout_task);
476 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
479 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
480 if (GNUNET_YES == pth->is_query)
482 cp->ppd.last_request_times[(cp->last_request_times_off++) %
483 MAX_QUEUE_PER_PEER] =
484 GNUNET_TIME_absolute_get ();
485 GNUNET_assert (0 < cp->ppd.pending_queries--);
487 else if (GNUNET_NO == pth->is_query)
489 GNUNET_assert (0 < cp->ppd.pending_replies--);
491 GNUNET_LOAD_update (cp->ppd.transmission_delay,
492 GNUNET_TIME_absolute_get_duration
493 (pth->transmission_request_start_time).rel_value);
494 ret = pth->gmc (pth->gmc_cls, size, buf);
495 GNUNET_assert (NULL == pth->cth);
496 for (pos = cp->pth_head; pos != NULL; pos = pos->next)
498 GNUNET_assert (pos != pth);
499 schedule_transmission (pos);
501 GNUNET_assert (pth->cth == NULL);
502 GNUNET_assert (pth->cth_in_progress == 0);
509 * (re)try to reserve bandwidth from the given peer.
511 * @param cls the 'struct GSF_ConnectedPeer' to reserve from
512 * @param tc scheduler context
515 retry_reservation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
517 struct GSF_ConnectedPeer *cp = cls;
519 struct GNUNET_PeerIdentity target;
521 GNUNET_PEER_resolve (cp->ppd.pid, &target);
522 cp->irc_delay_task = GNUNET_SCHEDULER_NO_TASK;
523 ip = cp->inc_preference;
524 cp->inc_preference = 0;
526 GNUNET_ATS_peer_change_preference (ats, &target,
528 &ats_reserve_callback, cp);
533 * Function called by core upon success or failure of our bandwidth reservation request.
535 * @param cls the 'struct GSF_ConnectedPeer' of the peer for which we made the request
536 * @param peer identifies the peer
537 * @param amount set to the amount that was actually reserved or unreserved;
538 * either the full requested amount or zero (no partial reservations)
539 * @param res_delay if the reservation could not be satisfied (amount was 0), how
540 * long should the client wait until re-trying?
543 ats_reserve_callback (void *cls, const struct GNUNET_PeerIdentity *peer,
544 int32_t amount, struct GNUNET_TIME_Relative res_delay)
546 struct GSF_ConnectedPeer *cp = cls;
547 struct GSF_PeerTransmitHandle *pth;
553 GNUNET_SCHEDULER_add_delayed (res_delay, &retry_reservation, cp);
556 cp->did_reserve = GNUNET_YES;
558 if ((NULL != pth) && (NULL == pth->cth))
560 /* reservation success, try transmission now! */
561 pth->cth_in_progress++;
563 GNUNET_CORE_notify_transmit_ready (GSF_core, GNUNET_YES, pth->priority,
564 GNUNET_TIME_absolute_get_remaining
565 (pth->timeout), peer, pth->size,
566 &peer_transmit_ready_cb, pth);
567 GNUNET_assert (0 < pth->cth_in_progress--);
573 * A peer connected to us. Setup the connected peer
576 * @param peer identity of peer that connected
577 * @param atsi performance data for the connection
578 * @return handle to connected peer entry
580 struct GSF_ConnectedPeer *
581 GSF_peer_connect_handler_ (const struct GNUNET_PeerIdentity *peer,
582 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
584 struct GSF_ConnectedPeer *cp;
588 cp = GNUNET_malloc (sizeof (struct GSF_ConnectedPeer));
589 cp->ppd.pid = GNUNET_PEER_intern (peer);
590 cp->ppd.transmission_delay = GNUNET_LOAD_value_init (GNUNET_TIME_UNIT_ZERO);
592 GNUNET_ATS_peer_change_preference (ats, peer,
594 &ats_reserve_callback, cp);
595 fn = get_trust_filename (peer);
596 if ((GNUNET_DISK_file_test (fn) == GNUNET_YES) &&
597 (sizeof (trust) == GNUNET_DISK_fn_read (fn, &trust, sizeof (trust))))
598 cp->disk_trust = cp->ppd.trust = ntohl (trust);
600 cp->request_map = GNUNET_CONTAINER_multihashmap_create (128);
601 GNUNET_break (GNUNET_OK ==
602 GNUNET_CONTAINER_multihashmap_put (cp_map, &peer->hashPubKey,
604 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
605 update_atsi (cp, atsi);
606 GSF_push_start_ (cp);
612 * It may be time to re-start migrating content to this
613 * peer. Check, and if so, restart migration.
615 * @param cls the 'struct GSF_ConnectedPeer'
616 * @param tc scheduler context
619 revive_migration (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
621 struct GSF_ConnectedPeer *cp = cls;
622 struct GNUNET_TIME_Relative bt;
624 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
625 bt = GNUNET_TIME_absolute_get_remaining (cp->ppd.migration_blocked_until);
626 if (0 != bt.rel_value)
628 /* still time left... */
629 cp->mig_revive_task =
630 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
633 GSF_push_start_ (cp);
638 * Get a handle for a connected peer.
640 * @param peer peer's identity
641 * @return NULL if the peer is not currently connected
643 struct GSF_ConnectedPeer *
644 GSF_peer_get_ (const struct GNUNET_PeerIdentity *peer)
648 return GNUNET_CONTAINER_multihashmap_get (cp_map, &peer->hashPubKey);
653 * Handle P2P "MIGRATION_STOP" message.
655 * @param cls closure, always NULL
656 * @param other the other peer involved (sender or receiver, NULL
657 * for loopback messages where we are both sender and receiver)
658 * @param message the actual message
659 * @param atsi performance information
660 * @return GNUNET_OK to keep the connection open,
661 * GNUNET_SYSERR to close it (signal serious error)
664 GSF_handle_p2p_migration_stop_ (void *cls,
665 const struct GNUNET_PeerIdentity *other,
666 const struct GNUNET_MessageHeader *message,
667 const struct GNUNET_TRANSPORT_ATS_Information
670 struct GSF_ConnectedPeer *cp;
671 const struct MigrationStopMessage *msm;
672 struct GNUNET_TIME_Relative bt;
674 msm = (const struct MigrationStopMessage *) message;
675 cp = GNUNET_CONTAINER_multihashmap_get (cp_map, &other->hashPubKey);
681 bt = GNUNET_TIME_relative_ntoh (msm->duration);
682 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
683 _("Migration of content to peer `%s' blocked for %llu ms\n"),
684 GNUNET_i2s (other), (unsigned long long) bt.rel_value);
685 cp->ppd.migration_blocked_until = GNUNET_TIME_relative_to_absolute (bt);
686 if (cp->mig_revive_task == GNUNET_SCHEDULER_NO_TASK)
689 cp->mig_revive_task =
690 GNUNET_SCHEDULER_add_delayed (bt, &revive_migration, cp);
692 update_atsi (cp, atsi);
698 * Copy reply and free put message.
700 * @param cls the 'struct PutMessage'
701 * @param buf_size number of bytes available in buf
702 * @param buf where to copy the message, NULL on error (peer disconnect)
703 * @return number of bytes copied to 'buf', can be 0 (without indicating an error)
706 copy_reply (void *cls, size_t buf_size, void *buf)
708 struct PutMessage *pm = cls;
713 GNUNET_assert (buf_size >= ntohs (pm->header.size));
714 size = ntohs (pm->header.size);
715 memcpy (buf, pm, size);
716 GNUNET_STATISTICS_update (GSF_stats,
718 ("# replies transmitted to other peers"), 1,
724 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# replies dropped"), 1,
733 * Cancel all requests associated with the peer.
736 * @param query hash code of the request
737 * @param value the 'struct GSF_PendingRequest'
738 * @return GNUNET_YES (continue to iterate)
741 cancel_pending_request (void *cls, const GNUNET_HashCode * query, void *value)
743 struct PeerRequest *peerreq = value;
744 struct GSF_PendingRequest *pr = peerreq->pr;
745 struct GSF_ConnectedPeer *cp = peerreq->cp;
746 struct GSF_PendingRequestData *prd;
748 if (peerreq->kill_task != GNUNET_SCHEDULER_NO_TASK)
750 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
751 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
753 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
755 prd = GSF_pending_request_get_data_ (pr);
756 GNUNET_break (GNUNET_YES ==
757 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
758 &prd->query, peerreq));
759 GSF_pending_request_cancel_ (pr, GNUNET_NO);
760 GNUNET_free (peerreq);
766 * Free the given request.
768 * @param cls the request to free
769 * @param tc task context
772 peer_request_destroy (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
774 struct PeerRequest *peerreq = cls;
775 struct GSF_PendingRequest *pr = peerreq->pr;
776 struct GSF_PendingRequestData *prd;
778 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
779 prd = GSF_pending_request_get_data_ (pr);
780 cancel_pending_request (NULL, &prd->query, peerreq);
785 * The artificial delay is over, transmit the message now.
787 * @param cls the 'struct GSF_DelayedHandle' with the message
788 * @param tc scheduler context
791 transmit_delayed_now (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
793 struct GSF_DelayedHandle *dh = cls;
794 struct GSF_ConnectedPeer *cp = dh->cp;
796 GNUNET_CONTAINER_DLL_remove (cp->delayed_head, cp->delayed_tail, dh);
797 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
799 GNUNET_free (dh->pm);
803 (void) GSF_peer_transmit_ (cp, GNUNET_NO, UINT32_MAX, REPLY_TIMEOUT,
804 dh->msize, ©_reply, dh->pm);
810 * Get the randomized delay a response should be subjected to.
812 * @return desired delay
814 static struct GNUNET_TIME_Relative
815 get_randomized_delay ()
817 struct GNUNET_TIME_Relative ret;
819 /* FIXME: replace 5000 with something relating to current observed P2P message latency */
821 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
822 GNUNET_CRYPTO_random_u32
823 (GNUNET_CRYPTO_QUALITY_WEAK, 5000));
824 GNUNET_STATISTICS_update (GSF_stats,
826 ("# artificial delays introduced (ms)"),
827 ret.rel_value, GNUNET_NO);
834 * Handle a reply to a pending request. Also called if a request
835 * expires (then with data == NULL). The handler may be called
836 * many times (depending on the request type), but will not be
837 * called during or after a call to GSF_pending_request_cancel
838 * and will also not be called anymore after a call signalling
841 * @param cls 'struct PeerRequest' this is an answer for
842 * @param eval evaluation of the result
843 * @param pr handle to the original pending request
844 * @param reply_anonymity_level anonymity level for the reply, UINT32_MAX for "unknown"
845 * @param expiration when does 'data' expire?
846 * @param type type of the block
847 * @param data response data, NULL on request expiration
848 * @param data_len number of bytes in data
851 handle_p2p_reply (void *cls, enum GNUNET_BLOCK_EvaluationResult eval,
852 struct GSF_PendingRequest *pr, uint32_t reply_anonymity_level,
853 struct GNUNET_TIME_Absolute expiration,
854 enum GNUNET_BLOCK_Type type, const void *data,
857 struct PeerRequest *peerreq = cls;
858 struct GSF_ConnectedPeer *cp = peerreq->cp;
859 struct GSF_PendingRequestData *prd;
860 struct PutMessage *pm;
863 GNUNET_assert (data_len + sizeof (struct PutMessage) <
864 GNUNET_SERVER_MAX_MESSAGE_SIZE);
865 GNUNET_assert (peerreq->pr == pr);
866 prd = GSF_pending_request_get_data_ (pr);
869 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
871 GNUNET_break (GNUNET_YES ==
872 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
873 &prd->query, peerreq));
874 GNUNET_free (peerreq);
877 GNUNET_break (type != GNUNET_BLOCK_TYPE_ANY);
878 if ((prd->type != type) && (prd->type != GNUNET_BLOCK_TYPE_ANY))
884 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
885 "Transmitting result for query `%s' to peer\n",
886 GNUNET_h2s (&prd->query));
888 GNUNET_STATISTICS_update (GSF_stats,
889 gettext_noop ("# replies received for other peers"),
891 msize = sizeof (struct PutMessage) + data_len;
892 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
897 if ((reply_anonymity_level != UINT32_MAX) && (reply_anonymity_level > 1))
899 if (reply_anonymity_level - 1 > GSF_cover_content_count)
901 GNUNET_STATISTICS_update (GSF_stats,
903 ("# replies dropped due to insufficient cover traffic"),
907 GSF_cover_content_count -= (reply_anonymity_level - 1);
910 pm = GNUNET_malloc (msize);
911 pm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
912 pm->header.size = htons (msize);
913 pm->type = htonl (type);
914 pm->expiration = GNUNET_TIME_absolute_hton (expiration);
915 memcpy (&pm[1], data, data_len);
916 if ((reply_anonymity_level != UINT32_MAX) && (reply_anonymity_level != 0) &&
917 (GSF_enable_randomized_delays == GNUNET_YES))
919 struct GSF_DelayedHandle *dh;
921 dh = GNUNET_malloc (sizeof (struct GSF_DelayedHandle));
925 GNUNET_CONTAINER_DLL_insert (cp->delayed_head, cp->delayed_tail, dh);
927 GNUNET_SCHEDULER_add_delayed (get_randomized_delay (),
928 &transmit_delayed_now, dh);
932 (void) GSF_peer_transmit_ (cp, GNUNET_NO, UINT32_MAX, REPLY_TIMEOUT, msize,
935 if (eval != GNUNET_BLOCK_EVALUATION_OK_LAST)
937 if (GNUNET_SCHEDULER_NO_TASK == peerreq->kill_task)
939 GNUNET_STATISTICS_update (GSF_stats,
941 ("# P2P searches destroyed due to ultimate reply"),
944 GNUNET_SCHEDULER_add_now (&peer_request_destroy, peerreq);
950 * Increase the host credit by a value.
952 * @param cp which peer to change the trust value on
953 * @param value is the int value by which the
954 * host credit is to be increased or decreased
955 * @returns the actual change in trust (positive or negative)
958 change_host_trust (struct GSF_ConnectedPeer *cp, int value)
962 GNUNET_assert (cp != NULL);
965 if (cp->ppd.trust + value < cp->ppd.trust)
967 value = UINT32_MAX - cp->ppd.trust;
968 cp->ppd.trust = UINT32_MAX;
971 cp->ppd.trust += value;
975 if (cp->ppd.trust < -value)
977 value = -cp->ppd.trust;
981 cp->ppd.trust += value;
988 * We've received a request with the specified priority. Bound it
989 * according to how much we trust the given peer.
991 * @param prio_in requested priority
992 * @param cp the peer making the request
993 * @return effective priority
996 bound_priority (uint32_t prio_in, struct GSF_ConnectedPeer *cp)
998 #define N ((double)128.0)
1003 ld = GSF_test_get_load_too_high_ (0);
1004 if (ld == GNUNET_SYSERR)
1006 GNUNET_STATISTICS_update (GSF_stats,
1008 ("# requests done for free (low load)"), 1,
1010 return 0; /* excess resources */
1012 if (prio_in > INT32_MAX)
1013 prio_in = INT32_MAX;
1014 ret = -change_host_trust (cp, -(int) prio_in);
1017 if (ret > GSF_current_priorities + N)
1018 rret = GSF_current_priorities + N;
1021 GSF_current_priorities = (GSF_current_priorities * (N - 1) + rret) / N;
1023 if ((ld == GNUNET_YES) && (ret > 0))
1025 /* try with charging */
1026 ld = GSF_test_get_load_too_high_ (ret);
1028 if (ld == GNUNET_YES)
1030 GNUNET_STATISTICS_update (GSF_stats,
1032 ("# request dropped, priority insufficient"), 1,
1035 change_host_trust (cp, (int) ret);
1036 return -1; /* not enough resources */
1040 GNUNET_STATISTICS_update (GSF_stats,
1042 ("# requests done for a price (normal load)"), 1,
1051 * The priority level imposes a bound on the maximum
1052 * value for the ttl that can be requested.
1054 * @param ttl_in requested ttl
1055 * @param prio given priority
1056 * @return ttl_in if ttl_in is below the limit,
1057 * otherwise the ttl-limit for the given priority
1060 bound_ttl (int32_t ttl_in, uint32_t prio)
1062 unsigned long long allowed;
1066 allowed = ((unsigned long long) prio) * TTL_DECREMENT / 1000;
1067 if (ttl_in > allowed)
1069 if (allowed >= (1 << 30))
1078 * Handle P2P "QUERY" message. Creates the pending request entry
1079 * and sets up all of the data structures to that we will
1080 * process replies properly. Does not initiate forwarding or
1081 * local database lookups.
1083 * @param other the other peer involved (sender or receiver, NULL
1084 * for loopback messages where we are both sender and receiver)
1085 * @param message the actual message
1086 * @return pending request handle, NULL on error
1088 struct GSF_PendingRequest *
1089 GSF_handle_p2p_query_ (const struct GNUNET_PeerIdentity *other,
1090 const struct GNUNET_MessageHeader *message)
1092 struct PeerRequest *peerreq;
1093 struct GSF_PendingRequest *pr;
1094 struct GSF_PendingRequestData *prd;
1095 struct GSF_ConnectedPeer *cp;
1096 struct GSF_ConnectedPeer *cps;
1097 const GNUNET_HashCode *namespace;
1098 const struct GNUNET_PeerIdentity *target;
1099 enum GSF_PendingRequestOptions options;
1101 const struct GetMessage *gm;
1103 const GNUNET_HashCode *opt;
1106 uint32_t ttl_decrement;
1109 enum GNUNET_BLOCK_Type type;
1110 GNUNET_PEER_Id spid;
1112 GNUNET_assert (other != NULL);
1113 msize = ntohs (message->size);
1114 if (msize < sizeof (struct GetMessage))
1116 GNUNET_break_op (0);
1119 GNUNET_STATISTICS_update (GSF_stats,
1121 ("# GET requests received (from other peers)"), 1,
1123 gm = (const struct GetMessage *) message;
1124 type = ntohl (gm->type);
1125 bm = ntohl (gm->hash_bitmap);
1133 if (msize < sizeof (struct GetMessage) + bits * sizeof (GNUNET_HashCode))
1135 GNUNET_break_op (0);
1138 opt = (const GNUNET_HashCode *) &gm[1];
1139 bfsize = msize - sizeof (struct GetMessage) - bits * sizeof (GNUNET_HashCode);
1140 /* bfsize must be power of 2, check! */
1141 if (0 != ((bfsize - 1) & bfsize))
1143 GNUNET_break_op (0);
1146 GSF_cover_query_count++;
1147 bm = ntohl (gm->hash_bitmap);
1149 cps = GNUNET_CONTAINER_multihashmap_get (cp_map, &other->hashPubKey);
1152 /* peer must have just disconnected */
1153 GNUNET_STATISTICS_update (GSF_stats,
1155 ("# requests dropped due to initiator not being connected"),
1159 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1160 cp = GNUNET_CONTAINER_multihashmap_get (cp_map, &opt[bits++]);
1166 if (0 != (bm & GET_MESSAGE_BIT_RETURN_TO))
1167 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1168 "Failed to find RETURN-TO peer `%4s' in connection set. Dropping query.\n",
1169 GNUNET_i2s ((const struct GNUNET_PeerIdentity *)
1173 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1174 "Failed to find peer `%4s' in connection set. Dropping query.\n",
1175 GNUNET_i2s (other));
1177 GNUNET_STATISTICS_update (GSF_stats,
1179 ("# requests dropped due to missing reverse route"),
1183 /* note that we can really only check load here since otherwise
1184 * peers could find out that we are overloaded by not being
1185 * disconnected after sending us a malformed query... */
1186 priority = bound_priority (ntohl (gm->priority), cps);
1190 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1191 "Dropping query from `%s', this peer is too busy.\n",
1192 GNUNET_i2s (other));
1197 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1198 "Received request for `%s' of type %u from peer `%4s' with flags %u\n",
1199 GNUNET_h2s (&gm->query), (unsigned int) type, GNUNET_i2s (other),
1202 namespace = (0 != (bm & GET_MESSAGE_BIT_SKS_NAMESPACE)) ? &opt[bits++] : NULL;
1203 if ((type == GNUNET_BLOCK_TYPE_FS_SBLOCK) && (namespace == NULL))
1205 GNUNET_break_op (0);
1208 if ((type != GNUNET_BLOCK_TYPE_FS_SBLOCK) && (namespace != NULL))
1210 GNUNET_break_op (0);
1215 (bm & GET_MESSAGE_BIT_TRANSMIT_TO)) ? ((const struct GNUNET_PeerIdentity
1216 *) &opt[bits++]) : NULL;
1219 if ((GNUNET_LOAD_get_load (cp->ppd.transmission_delay) > 3 * (1 + priority))
1220 || (GNUNET_LOAD_get_average (cp->ppd.transmission_delay) >
1221 GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value * 2 +
1222 GNUNET_LOAD_get_average (GSF_rt_entry_lifetime)))
1224 /* don't have BW to send to peer, or would likely take longer than we have for it,
1225 * so at best indirect the query */
1227 options |= GSF_PRO_FORWARD_ONLY;
1228 spid = GNUNET_PEER_intern (other);
1229 GNUNET_assert (0 != spid);
1231 ttl = bound_ttl (ntohl (gm->ttl), priority);
1232 /* decrement ttl (always) */
1234 2 * TTL_DECREMENT + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1236 if ((ttl < 0) && (((int32_t) (ttl - ttl_decrement)) > 0))
1239 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1240 "Dropping query from `%s' due to TTL underflow (%d - %u).\n",
1241 GNUNET_i2s (other), ttl, ttl_decrement);
1243 GNUNET_STATISTICS_update (GSF_stats,
1245 ("# requests dropped due TTL underflow"), 1,
1247 /* integer underflow => drop (should be very rare)! */
1250 ttl -= ttl_decrement;
1252 /* test if the request already exists */
1253 peerreq = GNUNET_CONTAINER_multihashmap_get (cp->request_map, &gm->query);
1254 if (peerreq != NULL)
1257 prd = GSF_pending_request_get_data_ (pr);
1258 if ((prd->type == type) &&
1259 ((type != GNUNET_BLOCK_TYPE_FS_SBLOCK) ||
1260 (0 == memcmp (&prd->namespace, namespace, sizeof (GNUNET_HashCode)))))
1262 if (prd->ttl.abs_value >= GNUNET_TIME_absolute_get ().abs_value + ttl)
1264 /* existing request has higher TTL, drop new one! */
1265 prd->priority += priority;
1267 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1268 "Have existing request with higher TTL, dropping new request.\n",
1269 GNUNET_i2s (other));
1271 GNUNET_STATISTICS_update (GSF_stats,
1273 ("# requests dropped due to higher-TTL request"),
1277 /* existing request has lower TTL, drop old one! */
1278 GNUNET_STATISTICS_update (GSF_stats,
1279 gettext_noop ("# P2P searches active"), -1,
1281 priority += prd->priority;
1282 GSF_pending_request_cancel_ (pr, GNUNET_YES);
1283 GNUNET_assert (GNUNET_YES ==
1284 GNUNET_CONTAINER_multihashmap_remove (cp->request_map,
1287 if (peerreq->kill_task != GNUNET_SCHEDULER_NO_TASK)
1289 GNUNET_SCHEDULER_cancel (peerreq->kill_task);
1290 peerreq->kill_task = GNUNET_SCHEDULER_NO_TASK;
1292 GNUNET_free (peerreq);
1296 peerreq = GNUNET_malloc (sizeof (struct PeerRequest));
1298 pr = GSF_pending_request_create_ (options, type, &gm->query, namespace,
1301 0) ? (const char *) &opt[bits] : NULL,
1302 bfsize, ntohl (gm->filter_mutator),
1304 (uint32_t) priority, ttl, spid, NULL, 0, /* replies_seen */
1305 &handle_p2p_reply, peerreq);
1306 GNUNET_assert (NULL != pr);
1308 GNUNET_break (GNUNET_OK ==
1309 GNUNET_CONTAINER_multihashmap_put (cp->request_map, &gm->query,
1311 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1312 GNUNET_STATISTICS_update (GSF_stats,
1314 ("# P2P query messages received and processed"), 1,
1316 GNUNET_STATISTICS_update (GSF_stats, gettext_noop ("# P2P searches active"),
1323 * Function called if there has been a timeout trying to satisfy
1324 * a transmission request.
1326 * @param cls the 'struct GSF_PeerTransmitHandle' of the request
1327 * @param tc scheduler context
1330 peer_transmit_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1332 struct GSF_PeerTransmitHandle *pth = cls;
1333 struct GSF_ConnectedPeer *cp;
1336 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1337 "Timeout trying to transmit to other peer\n");
1339 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1341 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1342 if (GNUNET_YES == pth->is_query)
1343 GNUNET_assert (0 < cp->ppd.pending_queries--);
1344 else if (GNUNET_NO == pth->is_query)
1345 GNUNET_assert (0 < cp->ppd.pending_replies--);
1346 GNUNET_LOAD_update (cp->ppd.transmission_delay, UINT64_MAX);
1347 if (NULL != pth->cth)
1349 GNUNET_CORE_notify_transmit_ready_cancel (pth->cth);
1352 pth->gmc (pth->gmc_cls, 0, NULL);
1353 GNUNET_assert (0 == pth->cth_in_progress);
1359 * Transmit a message to the given peer as soon as possible.
1360 * If the peer disconnects before the transmission can happen,
1361 * the callback is invoked with a 'NULL' buffer.
1363 * @param cp target peer
1364 * @param is_query is this a query (GNUNET_YES) or content (GNUNET_NO) or neither (GNUNET_SYSERR)
1365 * @param priority how important is this request?
1366 * @param timeout when does this request timeout (call gmc with error)
1367 * @param size number of bytes we would like to send to the peer
1368 * @param gmc function to call to get the message
1369 * @param gmc_cls closure for gmc
1370 * @return handle to cancel request
1372 struct GSF_PeerTransmitHandle *
1373 GSF_peer_transmit_ (struct GSF_ConnectedPeer *cp, int is_query,
1374 uint32_t priority, struct GNUNET_TIME_Relative timeout,
1375 size_t size, GSF_GetMessageCallback gmc, void *gmc_cls)
1377 struct GSF_PeerTransmitHandle *pth;
1378 struct GSF_PeerTransmitHandle *pos;
1379 struct GSF_PeerTransmitHandle *prev;
1381 pth = GNUNET_malloc (sizeof (struct GSF_PeerTransmitHandle));
1382 pth->transmission_request_start_time = GNUNET_TIME_absolute_get ();
1383 pth->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1385 pth->gmc_cls = gmc_cls;
1387 pth->is_query = is_query;
1388 pth->priority = priority;
1390 /* insertion sort (by priority, descending) */
1393 while ((pos != NULL) && (pos->priority > priority))
1399 GNUNET_CONTAINER_DLL_insert (cp->pth_head, cp->pth_tail, pth);
1401 GNUNET_CONTAINER_DLL_insert_after (cp->pth_head, cp->pth_tail, prev, pth);
1402 if (GNUNET_YES == is_query)
1403 cp->ppd.pending_queries++;
1404 else if (GNUNET_NO == is_query)
1405 cp->ppd.pending_replies++;
1407 GNUNET_SCHEDULER_add_delayed (timeout, &peer_transmit_timeout, pth);
1408 schedule_transmission (pth);
1414 * Cancel an earlier request for transmission.
1416 * @param pth request to cancel
1419 GSF_peer_transmit_cancel_ (struct GSF_PeerTransmitHandle *pth)
1421 struct GSF_ConnectedPeer *cp;
1423 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1425 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1426 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1428 if (NULL != pth->cth)
1430 GNUNET_CORE_notify_transmit_ready_cancel (pth->cth);
1434 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1435 if (GNUNET_YES == pth->is_query)
1436 GNUNET_assert (0 < cp->ppd.pending_queries--);
1437 else if (GNUNET_NO == pth->is_query)
1438 GNUNET_assert (0 < cp->ppd.pending_replies--);
1439 GNUNET_assert (0 == pth->cth_in_progress);
1445 * Report on receiving a reply; update the performance record of the given peer.
1447 * @param cp responding peer (will be updated)
1448 * @param request_time time at which the original query was transmitted
1449 * @param request_priority priority of the original request
1452 GSF_peer_update_performance_ (struct GSF_ConnectedPeer *cp,
1453 struct GNUNET_TIME_Absolute request_time,
1454 uint32_t request_priority)
1456 struct GNUNET_TIME_Relative delay;
1458 delay = GNUNET_TIME_absolute_get_duration (request_time);
1459 cp->ppd.avg_reply_delay.rel_value =
1460 (cp->ppd.avg_reply_delay.rel_value * (RUNAVG_DELAY_N - 1) +
1461 delay.rel_value) / RUNAVG_DELAY_N;
1462 cp->ppd.avg_priority =
1463 (cp->ppd.avg_priority * (RUNAVG_DELAY_N - 1) +
1464 request_priority) / RUNAVG_DELAY_N;
1469 * Report on receiving a reply in response to an initiating client.
1470 * Remember that this peer is good for this client.
1472 * @param cp responding peer (will be updated)
1473 * @param initiator_client local client on responsible for query
1476 GSF_peer_update_responder_client_ (struct GSF_ConnectedPeer *cp,
1477 struct GSF_LocalClient *initiator_client)
1479 cp->ppd.last_client_replies[cp->last_client_replies_woff++ %
1480 CS2P_SUCCESS_LIST_SIZE] = initiator_client;
1485 * Report on receiving a reply in response to an initiating peer.
1486 * Remember that this peer is good for this initiating peer.
1488 * @param cp responding peer (will be updated)
1489 * @param initiator_peer other peer responsible for query
1492 GSF_peer_update_responder_peer_ (struct GSF_ConnectedPeer *cp,
1493 const struct GSF_ConnectedPeer *initiator_peer)
1497 woff = cp->last_p2p_replies_woff % P2P_SUCCESS_LIST_SIZE;
1498 GNUNET_PEER_change_rc (cp->ppd.last_p2p_replies[woff], -1);
1499 cp->ppd.last_p2p_replies[woff] = initiator_peer->ppd.pid;
1500 GNUNET_PEER_change_rc (initiator_peer->ppd.pid, 1);
1501 cp->last_p2p_replies_woff = (woff + 1) % P2P_SUCCESS_LIST_SIZE;
1506 * A peer disconnected from us. Tear down the connected peer
1510 * @param peer identity of peer that connected
1513 GSF_peer_disconnect_handler_ (void *cls, const struct GNUNET_PeerIdentity *peer)
1515 struct GSF_ConnectedPeer *cp;
1516 struct GSF_PeerTransmitHandle *pth;
1517 struct GSF_DelayedHandle *dh;
1519 cp = GNUNET_CONTAINER_multihashmap_get (cp_map, &peer->hashPubKey);
1521 return; /* must have been disconnect from core with
1522 * 'peer' == my_id, ignore */
1523 GNUNET_assert (GNUNET_YES ==
1524 GNUNET_CONTAINER_multihashmap_remove (cp_map,
1525 &peer->hashPubKey, cp));
1526 if (NULL != cp->migration_pth)
1528 GSF_peer_transmit_cancel_ (cp->migration_pth);
1529 cp->migration_pth = NULL;
1531 if (NULL != cp->irc)
1533 GNUNET_ATS_peer_change_preference_cancel (cp->irc);
1536 if (GNUNET_SCHEDULER_NO_TASK != cp->irc_delay_task)
1538 GNUNET_SCHEDULER_cancel (cp->irc_delay_task);
1539 cp->irc_delay_task = GNUNET_SCHEDULER_NO_TASK;
1541 GNUNET_CONTAINER_multihashmap_iterate (cp->request_map,
1542 &cancel_pending_request, cp);
1543 GNUNET_CONTAINER_multihashmap_destroy (cp->request_map);
1544 cp->request_map = NULL;
1545 GSF_plan_notify_peer_disconnect_ (cp);
1546 GNUNET_LOAD_value_free (cp->ppd.transmission_delay);
1547 GNUNET_PEER_decrement_rcs (cp->ppd.last_p2p_replies, P2P_SUCCESS_LIST_SIZE);
1548 memset (cp->ppd.last_p2p_replies, 0, sizeof (cp->ppd.last_p2p_replies));
1549 GSF_push_stop_ (cp);
1550 while (NULL != (pth = cp->pth_head))
1552 if (NULL != pth->cth)
1554 GNUNET_CORE_notify_transmit_ready_cancel (pth->cth);
1557 if (pth->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1559 GNUNET_SCHEDULER_cancel (pth->timeout_task);
1560 pth->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1562 GNUNET_CONTAINER_DLL_remove (cp->pth_head, cp->pth_tail, pth);
1563 GNUNET_assert (0 == pth->cth_in_progress);
1564 pth->gmc (pth->gmc_cls, 0, NULL);
1567 while (NULL != (dh = cp->delayed_head))
1569 GNUNET_CONTAINER_DLL_remove (cp->delayed_head, cp->delayed_tail, dh);
1570 GNUNET_SCHEDULER_cancel (dh->delay_task);
1571 GNUNET_free (dh->pm);
1574 GNUNET_PEER_change_rc (cp->ppd.pid, -1);
1575 if (GNUNET_SCHEDULER_NO_TASK != cp->mig_revive_task)
1577 GNUNET_SCHEDULER_cancel (cp->mig_revive_task);
1578 cp->mig_revive_task = GNUNET_SCHEDULER_NO_TASK;
1585 * Closure for 'call_iterator'.
1587 struct IterationContext
1590 * Function to call on each entry.
1592 GSF_ConnectedPeerIterator it;
1602 * Function that calls the callback for each peer.
1604 * @param cls the 'struct IterationContext*'
1605 * @param key identity of the peer
1606 * @param value the 'struct GSF_ConnectedPeer*'
1607 * @return GNUNET_YES to continue iteration
1610 call_iterator (void *cls, const GNUNET_HashCode * key, void *value)
1612 struct IterationContext *ic = cls;
1613 struct GSF_ConnectedPeer *cp = value;
1615 ic->it (ic->it_cls, (const struct GNUNET_PeerIdentity *) key, cp, &cp->ppd);
1621 * Iterate over all connected peers.
1623 * @param it function to call for each peer
1624 * @param it_cls closure for it
1627 GSF_iterate_connected_peers_ (GSF_ConnectedPeerIterator it, void *it_cls)
1629 struct IterationContext ic;
1633 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &call_iterator, &ic);
1638 * Obtain the identity of a connected peer.
1640 * @param cp peer to reserve bandwidth from
1641 * @param id identity to set (written to)
1644 GSF_connected_peer_get_identity_ (const struct GSF_ConnectedPeer *cp,
1645 struct GNUNET_PeerIdentity *id)
1647 GNUNET_assert (0 != cp->ppd.pid);
1648 GNUNET_PEER_resolve (cp->ppd.pid, id);
1653 * Assemble a migration stop message for transmission.
1655 * @param cls the 'struct GSF_ConnectedPeer' to use
1656 * @param size number of bytes we're allowed to write to buf
1657 * @param buf where to copy the message
1658 * @return number of bytes copied to buf
1661 create_migration_stop_message (void *cls, size_t size, void *buf)
1663 struct GSF_ConnectedPeer *cp = cls;
1664 struct MigrationStopMessage msm;
1666 cp->migration_pth = NULL;
1669 GNUNET_assert (size >= sizeof (struct MigrationStopMessage));
1670 msm.header.size = htons (sizeof (struct MigrationStopMessage));
1671 msm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_MIGRATION_STOP);
1672 msm.reserved = htonl (0);
1674 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
1675 (cp->last_migration_block));
1676 memcpy (buf, &msm, sizeof (struct MigrationStopMessage));
1677 return sizeof (struct MigrationStopMessage);
1682 * Ask a peer to stop migrating data to us until the given point
1685 * @param cp peer to ask
1686 * @param block_time until when to block
1689 GSF_block_peer_migration_ (struct GSF_ConnectedPeer *cp,
1690 struct GNUNET_TIME_Relative block_time)
1692 if (GNUNET_TIME_absolute_get_remaining (cp->last_migration_block).rel_value >
1693 block_time.rel_value)
1696 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1697 "Migration already blocked for another %llu ms\n",
1698 (unsigned long long)
1699 GNUNET_TIME_absolute_get_remaining
1700 (cp->last_migration_block).rel_value);
1702 return; /* already blocked */
1705 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Asking to stop migration for %llu ms\n",
1706 (unsigned long long) block_time.rel_value);
1708 cp->last_migration_block = GNUNET_TIME_relative_to_absolute (block_time);
1709 if (cp->migration_pth != NULL)
1710 GSF_peer_transmit_cancel_ (cp->migration_pth);
1712 GSF_peer_transmit_ (cp, GNUNET_SYSERR, UINT32_MAX,
1713 GNUNET_TIME_UNIT_FOREVER_REL,
1714 sizeof (struct MigrationStopMessage),
1715 &create_migration_stop_message, cp);
1720 * Write host-trust information to a file - flush the buffer entry!
1722 * @param cls closure, not used
1723 * @param key host identity
1724 * @param value the 'struct GSF_ConnectedPeer' to flush
1725 * @return GNUNET_OK to continue iteration
1728 flush_trust (void *cls, const GNUNET_HashCode * key, void *value)
1730 struct GSF_ConnectedPeer *cp = value;
1733 struct GNUNET_PeerIdentity pid;
1735 if (cp->ppd.trust == cp->disk_trust)
1736 return GNUNET_OK; /* unchanged */
1737 GNUNET_assert (0 != cp->ppd.pid);
1738 GNUNET_PEER_resolve (cp->ppd.pid, &pid);
1739 fn = get_trust_filename (&pid);
1740 if (cp->ppd.trust == 0)
1742 if ((0 != UNLINK (fn)) && (errno != ENOENT))
1743 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING |
1744 GNUNET_ERROR_TYPE_BULK, "unlink", fn);
1748 trust = htonl (cp->ppd.trust);
1749 if (sizeof (uint32_t) ==
1750 GNUNET_DISK_fn_write (fn, &trust, sizeof (uint32_t),
1751 GNUNET_DISK_PERM_USER_READ |
1752 GNUNET_DISK_PERM_USER_WRITE |
1753 GNUNET_DISK_PERM_GROUP_READ |
1754 GNUNET_DISK_PERM_OTHER_READ))
1755 cp->disk_trust = cp->ppd.trust;
1763 * Notify core about a preference we have for the given peer
1764 * (to allocate more resources towards it). The change will
1765 * be communicated the next time we reserve bandwidth with
1766 * core (not instantly).
1768 * @param cp peer to reserve bandwidth from
1769 * @param pref preference change
1772 GSF_connected_peer_change_preference_ (struct GSF_ConnectedPeer *cp,
1775 cp->inc_preference += pref;
1780 * Call this method periodically to flush trust information to disk.
1782 * @param cls closure, not used
1783 * @param tc task context, not used
1786 cron_flush_trust (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1791 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &flush_trust, NULL);
1794 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1796 GNUNET_SCHEDULER_add_delayed (TRUST_FLUSH_FREQ, &cron_flush_trust, NULL);
1801 * Initialize peer management subsystem.
1804 GSF_connected_peer_init_ ()
1806 cp_map = GNUNET_CONTAINER_multihashmap_create (128);
1807 ats = GNUNET_ATS_init (GSF_cfg, NULL, NULL);
1808 GNUNET_assert (GNUNET_OK ==
1809 GNUNET_CONFIGURATION_get_value_filename (GSF_cfg, "fs",
1812 GNUNET_DISK_directory_create (trustDirectory);
1813 GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_HIGH,
1814 &cron_flush_trust, NULL);
1819 * Iterator to free peer entries.
1821 * @param cls closure, unused
1822 * @param key current key code
1823 * @param value value in the hash map (peer entry)
1824 * @return GNUNET_YES (we should continue to iterate)
1827 clean_peer (void *cls, const GNUNET_HashCode * key, void *value)
1829 GSF_peer_disconnect_handler_ (NULL, (const struct GNUNET_PeerIdentity *) key);
1835 * Shutdown peer management subsystem.
1838 GSF_connected_peer_done_ ()
1840 cron_flush_trust (NULL, NULL);
1841 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &clean_peer, NULL);
1842 GNUNET_CONTAINER_multihashmap_destroy (cp_map);
1844 GNUNET_free (trustDirectory);
1845 trustDirectory = NULL;
1846 GNUNET_ATS_shutdown (ats);
1852 * Iterator to remove references to LC entry.
1854 * @param cls the 'struct GSF_LocalClient*' to look for
1855 * @param key current key code
1856 * @param value value in the hash map (peer entry)
1857 * @return GNUNET_YES (we should continue to iterate)
1860 clean_local_client (void *cls, const GNUNET_HashCode * key, void *value)
1862 const struct GSF_LocalClient *lc = cls;
1863 struct GSF_ConnectedPeer *cp = value;
1866 for (i = 0; i < CS2P_SUCCESS_LIST_SIZE; i++)
1867 if (cp->ppd.last_client_replies[i] == lc)
1868 cp->ppd.last_client_replies[i] = NULL;
1874 * Notification that a local client disconnected. Clean up all of our
1875 * references to the given handle.
1877 * @param lc handle to the local client (henceforth invalid)
1880 GSF_handle_local_client_disconnect_ (const struct GSF_LocalClient *lc)
1883 return; /* already cleaned up */
1884 GNUNET_CONTAINER_multihashmap_iterate (cp_map, &clean_local_client,
1889 /* end of gnunet-service-fs_cp.c */