2 This file is part of GNUnet.
3 (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 * @file dht/gnunet-service-dht_neighbours.c
23 * @brief GNUnet DHT service's bucket and neighbour management code
24 * @author Christian Grothoff
25 * @author Nathan Evans
29 #include "gnunet_block_lib.h"
30 #include "gnunet_util_lib.h"
31 #include "gnunet_hello_lib.h"
32 #include "gnunet_constants.h"
33 #include "gnunet_protocols.h"
34 #include "gnunet_nse_service.h"
35 #include "gnunet_ats_service.h"
36 #include "gnunet_core_service.h"
37 #include "gnunet_datacache_lib.h"
38 #include "gnunet_transport_service.h"
39 #include "gnunet_hello_lib.h"
40 #include "gnunet_dht_service.h"
41 #include "gnunet_statistics_service.h"
42 #include "gnunet-service-dht.h"
43 #include "gnunet-service-dht_clients.h"
44 #include "gnunet-service-dht_datacache.h"
45 #include "gnunet-service-dht_hello.h"
46 #include "gnunet-service-dht_neighbours.h"
47 #include "gnunet-service-dht_nse.h"
48 #include "gnunet-service-dht_routing.h"
53 * How many buckets will we allow total.
55 #define MAX_BUCKETS sizeof (struct GNUNET_HashCode) * 8
58 * What is the maximum number of peers in a given bucket.
60 #define DEFAULT_BUCKET_SIZE 8
63 * Desired replication level for FIND PEER requests
65 #define FIND_PEER_REPLICATION_LEVEL 4
68 * Maximum allowed replication level for all requests.
70 #define MAXIMUM_REPLICATION_LEVEL 16
73 * Maximum allowed number of pending messages per peer.
75 #define MAXIMUM_PENDING_PER_PEER 64
78 * How often to update our preference levels for peers in our routing tables.
80 #define DHT_DEFAULT_PREFERENCE_INTERVAL GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MINUTES, 2)
83 * How long at least to wait before sending another find peer request.
85 #define DHT_MINIMUM_FIND_PEER_INTERVAL GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 30)
88 * How long at most to wait before sending another find peer request.
90 #define DHT_MAXIMUM_FIND_PEER_INTERVAL GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MINUTES, 10)
93 * How long at most to wait for transmission of a GET request to another peer?
95 #define GET_TIMEOUT GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MINUTES, 2)
98 * Should routing details be logged to stderr (for debugging)?
100 #define LOG_ROUTE_DETAILS_STDERR GNUNET_NO
104 * Hello address expiration
106 extern struct GNUNET_TIME_Relative hello_expiration;
109 GNUNET_NETWORK_STRUCT_BEGIN
114 struct PeerPutMessage
117 * Type: GNUNET_MESSAGE_TYPE_DHT_P2P_PUT
119 struct GNUNET_MessageHeader header;
124 uint32_t options GNUNET_PACKED;
129 uint32_t type GNUNET_PACKED;
134 uint32_t hop_count GNUNET_PACKED;
137 * Replication level for this message
139 uint32_t desired_replication_level GNUNET_PACKED;
142 * Length of the PUT path that follows (if tracked).
144 uint32_t put_path_length GNUNET_PACKED;
147 * When does the content expire?
149 struct GNUNET_TIME_AbsoluteNBO expiration_time;
152 * Bloomfilter (for peer identities) to stop circular routes
154 char bloomfilter[DHT_BLOOM_SIZE];
157 * The key we are storing under.
159 struct GNUNET_HashCode key;
161 /* put path (if tracked) */
171 struct PeerResultMessage
174 * Type: GNUNET_MESSAGE_TYPE_DHT_P2P_RESULT
176 struct GNUNET_MessageHeader header;
181 uint32_t type GNUNET_PACKED;
184 * Length of the PUT path that follows (if tracked).
186 uint32_t put_path_length GNUNET_PACKED;
189 * Length of the GET path that follows (if tracked).
191 uint32_t get_path_length GNUNET_PACKED;
194 * When does the content expire?
196 struct GNUNET_TIME_AbsoluteNBO expiration_time;
199 * The key of the corresponding GET request.
201 struct GNUNET_HashCode key;
203 /* put path (if tracked) */
205 /* get path (if tracked) */
215 struct PeerGetMessage
218 * Type: GNUNET_MESSAGE_TYPE_DHT_P2P_GET
220 struct GNUNET_MessageHeader header;
225 uint32_t options GNUNET_PACKED;
228 * Desired content type.
230 uint32_t type GNUNET_PACKED;
235 uint32_t hop_count GNUNET_PACKED;
238 * Desired replication level for this request.
240 uint32_t desired_replication_level GNUNET_PACKED;
243 * Size of the extended query.
245 uint32_t xquery_size;
248 * Bloomfilter mutator.
253 * Bloomfilter (for peer identities) to stop circular routes
255 char bloomfilter[DHT_BLOOM_SIZE];
258 * The key we are looking for.
260 struct GNUNET_HashCode key;
264 /* result bloomfilter */
267 GNUNET_NETWORK_STRUCT_END
270 * Linked list of messages to send to a particular other peer.
272 struct P2PPendingMessage
275 * Pointer to next item in the list
277 struct P2PPendingMessage *next;
280 * Pointer to previous item in the list
282 struct P2PPendingMessage *prev;
285 * Message importance level. FIXME: used? useful?
287 unsigned int importance;
290 * When does this message time out?
292 struct GNUNET_TIME_Absolute timeout;
295 * Actual message to be sent, allocated at the end of the struct:
296 * // msg = (cast) &pm[1];
297 * // memcpy (&pm[1], data, len);
299 const struct GNUNET_MessageHeader *msg;
305 * Entry for a peer in a bucket.
310 * Next peer entry (DLL)
312 struct PeerInfo *next;
315 * Prev peer entry (DLL)
317 struct PeerInfo *prev;
320 * Count of outstanding messages for peer.
322 unsigned int pending_count;
325 * Head of pending messages to be sent to this peer.
327 struct P2PPendingMessage *head;
330 * Tail of pending messages to be sent to this peer.
332 struct P2PPendingMessage *tail;
335 * Core handle for sending messages to this peer.
337 struct GNUNET_CORE_TransmitHandle *th;
340 * Task for scheduling preference updates
342 GNUNET_SCHEDULER_TaskIdentifier preference_task;
345 * What is the identity of the peer?
347 struct GNUNET_PeerIdentity id;
351 * What is the average latency for replies received?
353 struct GNUNET_TIME_Relative latency;
356 * Transport level distance to peer.
358 unsigned int distance;
365 * Peers are grouped into buckets.
372 struct PeerInfo *head;
377 struct PeerInfo *tail;
380 * Number of peers in the bucket.
382 unsigned int peers_size;
387 * The lowest currently used bucket, initially 0 (for 0-bits matching bucket).
389 static unsigned int closest_bucket;
392 * How many peers have we added since we sent out our last
395 static unsigned int newly_found_peers;
398 * Option for testing that disables the 'connect' function of the DHT.
400 static int disable_try_connect;
403 * The buckets. Array of size MAX_BUCKET_SIZE. Offset 0 means 0 bits matching.
405 static struct PeerBucket k_buckets[MAX_BUCKETS];
408 * Hash map of all known peers, for easy removal from k_buckets on disconnect.
410 static struct GNUNET_CONTAINER_MultiHashMap *all_known_peers;
413 * Maximum size for each bucket.
415 static unsigned int bucket_size = DEFAULT_BUCKET_SIZE;
418 * Task that sends FIND PEER requests.
420 static GNUNET_SCHEDULER_TaskIdentifier find_peer_task;
423 * Identity of this peer.
425 static struct GNUNET_PeerIdentity my_identity;
430 static struct GNUNET_CORE_Handle *coreAPI;
435 static struct GNUNET_ATS_PerformanceHandle *atsAPI;
440 * Find the optimal bucket for this key.
442 * @param hc the hashcode to compare our identity to
443 * @return the proper bucket index, or GNUNET_SYSERR
444 * on error (same hashcode)
447 find_bucket (const struct GNUNET_HashCode * hc)
451 bits = GNUNET_CRYPTO_hash_matching_bits (&my_identity.hashPubKey, hc);
452 if (bits == MAX_BUCKETS)
454 /* How can all bits match? Got my own ID? */
456 return GNUNET_SYSERR;
458 return MAX_BUCKETS - bits - 1;
463 * Let GNUnet core know that we like the given peer.
465 * @param cls the 'struct PeerInfo' of the peer
466 * @param tc scheduler context.
469 update_core_preference (void *cls,
470 const struct GNUNET_SCHEDULER_TaskContext *tc)
472 struct PeerInfo *peer = cls;
474 unsigned int matching;
477 peer->preference_task = GNUNET_SCHEDULER_NO_TASK;
478 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
481 GNUNET_CRYPTO_hash_matching_bits (&my_identity.hashPubKey,
482 &peer->id.hashPubKey);
485 bucket = find_bucket (&peer->id.hashPubKey);
486 if (bucket == GNUNET_SYSERR)
490 GNUNET_assert (k_buckets[bucket].peers_size != 0);
491 preference = (1LL << matching) / k_buckets[bucket].peers_size;
495 peer->preference_task =
496 GNUNET_SCHEDULER_add_delayed (DHT_DEFAULT_PREFERENCE_INTERVAL,
497 &update_core_preference, peer);
500 GNUNET_STATISTICS_update (GDS_stats,
501 gettext_noop ("# Preference updates given to core"),
503 GNUNET_ATS_change_preference (atsAPI, &peer->id,
504 GNUNET_ATS_PREFERENCE_BANDWIDTH,
505 (double) preference, GNUNET_ATS_PREFERENCE_END);
506 peer->preference_task =
507 GNUNET_SCHEDULER_add_delayed (DHT_DEFAULT_PREFERENCE_INTERVAL,
508 &update_core_preference, peer);
515 * Closure for 'add_known_to_bloom'.
517 struct BloomConstructorContext
520 * Bloom filter under construction.
522 struct GNUNET_CONTAINER_BloomFilter *bloom;
532 * Add each of the peers we already know to the bloom filter of
533 * the request so that we don't get duplicate HELLOs.
535 * @param cls the 'struct BloomConstructorContext'.
536 * @param key peer identity to add to the bloom filter
537 * @param value value the peer information (unused)
538 * @return GNUNET_YES (we should continue to iterate)
541 add_known_to_bloom (void *cls, const struct GNUNET_HashCode * key, void *value)
543 struct BloomConstructorContext *ctx = cls;
544 struct GNUNET_HashCode mh;
546 GNUNET_BLOCK_mingle_hash (key, ctx->bf_mutator, &mh);
547 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
548 "Adding known peer (%s) to bloomfilter for FIND PEER with mutation %u\n",
549 GNUNET_h2s (key), ctx->bf_mutator);
550 GNUNET_CONTAINER_bloomfilter_add (ctx->bloom, &mh);
556 * Task to send a find peer message for our own peer identifier
557 * so that we can find the closest peers in the network to ourselves
558 * and attempt to connect to them.
560 * @param cls closure for this task
561 * @param tc the context under which the task is running
564 send_find_peer_message (void *cls,
565 const struct GNUNET_SCHEDULER_TaskContext *tc)
567 struct GNUNET_TIME_Relative next_send_time;
568 struct BloomConstructorContext bcc;
569 struct GNUNET_CONTAINER_BloomFilter *peer_bf;
571 find_peer_task = GNUNET_SCHEDULER_NO_TASK;
572 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
574 if (newly_found_peers > bucket_size)
576 /* If we are finding many peers already, no need to send out our request right now! */
578 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
579 &send_find_peer_message, NULL);
580 newly_found_peers = 0;
584 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, UINT32_MAX);
586 GNUNET_CONTAINER_bloomfilter_init (NULL, DHT_BLOOM_SIZE,
587 GNUNET_CONSTANTS_BLOOMFILTER_K);
588 GNUNET_CONTAINER_multihashmap_iterate (all_known_peers, &add_known_to_bloom,
590 GNUNET_STATISTICS_update (GDS_stats,
591 gettext_noop ("# FIND PEER messages initiated"), 1,
594 GNUNET_CONTAINER_bloomfilter_init (NULL, DHT_BLOOM_SIZE,
595 GNUNET_CONSTANTS_BLOOMFILTER_K);
596 // FIXME: pass priority!?
597 GDS_NEIGHBOURS_handle_get (GNUNET_BLOCK_TYPE_DHT_HELLO,
598 GNUNET_DHT_RO_FIND_PEER,
599 FIND_PEER_REPLICATION_LEVEL, 0,
600 &my_identity.hashPubKey, NULL, 0, bcc.bloom,
601 bcc.bf_mutator, peer_bf);
602 GNUNET_CONTAINER_bloomfilter_free (peer_bf);
603 GNUNET_CONTAINER_bloomfilter_free (bcc.bloom);
604 /* schedule next round */
605 next_send_time.rel_value =
606 DHT_MINIMUM_FIND_PEER_INTERVAL.rel_value +
607 GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK,
608 DHT_MAXIMUM_FIND_PEER_INTERVAL.rel_value /
609 (newly_found_peers + 1));
610 newly_found_peers = 0;
612 GNUNET_SCHEDULER_add_delayed (next_send_time, &send_find_peer_message,
618 * Method called whenever a peer connects.
621 * @param peer peer identity this notification is about
622 * @param atsi performance data
623 * @param atsi_count number of records in 'atsi'
626 handle_core_connect (void *cls, const struct GNUNET_PeerIdentity *peer,
627 const struct GNUNET_ATS_Information *atsi,
628 unsigned int atsi_count)
630 struct PeerInfo *ret;
633 /* Check for connect to self message */
634 if (0 == memcmp (&my_identity, peer, sizeof (struct GNUNET_PeerIdentity)))
636 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connected %s to %s\n",
637 GNUNET_i2s (&my_identity), GNUNET_h2s (&peer->hashPubKey));
639 GNUNET_CONTAINER_multihashmap_contains (all_known_peers,
645 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# peers connected"), 1,
647 peer_bucket = find_bucket (&peer->hashPubKey);
648 GNUNET_assert ((peer_bucket >= 0) && (peer_bucket < MAX_BUCKETS));
649 ret = GNUNET_malloc (sizeof (struct PeerInfo));
651 ret->latency = latency;
652 ret->distance = distance;
655 GNUNET_CONTAINER_DLL_insert_tail (k_buckets[peer_bucket].head,
656 k_buckets[peer_bucket].tail, ret);
657 k_buckets[peer_bucket].peers_size++;
658 closest_bucket = GNUNET_MAX (closest_bucket, peer_bucket);
659 if ((peer_bucket > 0) && (k_buckets[peer_bucket].peers_size <= bucket_size))
661 ret->preference_task =
662 GNUNET_SCHEDULER_add_now (&update_core_preference, ret);
665 GNUNET_assert (GNUNET_OK ==
666 GNUNET_CONTAINER_multihashmap_put (all_known_peers,
667 &peer->hashPubKey, ret,
668 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
669 if (1 == GNUNET_CONTAINER_multihashmap_size (all_known_peers))
671 /* got a first connection, good time to start with FIND PEER requests... */
672 find_peer_task = GNUNET_SCHEDULER_add_now (&send_find_peer_message, NULL);
678 * Method called whenever a peer disconnects.
681 * @param peer peer identity this notification is about
684 handle_core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
686 struct PeerInfo *to_remove;
688 struct P2PPendingMessage *pos;
689 unsigned int discarded;
691 /* Check for disconnect from self message */
692 if (0 == memcmp (&my_identity, peer, sizeof (struct GNUNET_PeerIdentity)))
694 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnected %s from %s\n",
695 GNUNET_i2s (&my_identity), GNUNET_h2s (&peer->hashPubKey));
697 GNUNET_CONTAINER_multihashmap_get (all_known_peers, &peer->hashPubKey);
698 if (NULL == to_remove)
703 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# peers connected"), -1,
705 GNUNET_assert (GNUNET_YES ==
706 GNUNET_CONTAINER_multihashmap_remove (all_known_peers,
709 if (GNUNET_SCHEDULER_NO_TASK != to_remove->preference_task)
711 GNUNET_SCHEDULER_cancel (to_remove->preference_task);
712 to_remove->preference_task = GNUNET_SCHEDULER_NO_TASK;
714 current_bucket = find_bucket (&to_remove->id.hashPubKey);
715 GNUNET_assert (current_bucket >= 0);
716 GNUNET_CONTAINER_DLL_remove (k_buckets[current_bucket].head,
717 k_buckets[current_bucket].tail, to_remove);
718 GNUNET_assert (k_buckets[current_bucket].peers_size > 0);
719 k_buckets[current_bucket].peers_size--;
720 while ((closest_bucket > 0) && (k_buckets[closest_bucket].peers_size == 0))
723 if (to_remove->th != NULL)
725 GNUNET_CORE_notify_transmit_ready_cancel (to_remove->th);
726 to_remove->th = NULL;
729 while (NULL != (pos = to_remove->head))
731 GNUNET_CONTAINER_DLL_remove (to_remove->head, to_remove->tail, pos);
735 GNUNET_STATISTICS_update (GDS_stats,
737 ("# Queued messages discarded (peer disconnected)"),
738 discarded, GNUNET_NO);
739 GNUNET_free (to_remove);
744 * Called when core is ready to send a message we asked for
745 * out to the destination.
747 * @param cls the 'struct PeerInfo' of the target peer
748 * @param size number of bytes available in buf
749 * @param buf where the callee should write the message
750 * @return number of bytes written to buf
753 core_transmit_notify (void *cls, size_t size, void *buf)
755 struct PeerInfo *peer = cls;
757 struct P2PPendingMessage *pending;
762 while ((NULL != (pending = peer->head)) &&
763 (GNUNET_TIME_absolute_get_remaining (pending->timeout).rel_value == 0))
765 peer->pending_count--;
766 GNUNET_CONTAINER_DLL_remove (peer->head, peer->tail, pending);
767 GNUNET_free (pending);
771 /* no messages pending */
777 GNUNET_CORE_notify_transmit_ready (coreAPI, GNUNET_YES,
779 GNUNET_TIME_absolute_get_remaining
780 (pending->timeout), &peer->id,
781 ntohs (pending->msg->size),
782 &core_transmit_notify, peer);
783 GNUNET_break (NULL != peer->th);
787 while ((NULL != (pending = peer->head)) &&
788 (size - off >= (msize = ntohs (pending->msg->size))))
790 GNUNET_STATISTICS_update (GDS_stats,
792 ("# Bytes transmitted to other peers"), msize,
794 memcpy (&cbuf[off], pending->msg, msize);
796 peer->pending_count--;
797 GNUNET_CONTAINER_DLL_remove (peer->head, peer->tail, pending);
798 GNUNET_free (pending);
800 if (peer->head != NULL)
803 GNUNET_CORE_notify_transmit_ready (coreAPI, GNUNET_YES,
805 GNUNET_TIME_absolute_get_remaining
806 (pending->timeout), &peer->id, msize,
807 &core_transmit_notify, peer);
808 GNUNET_break (NULL != peer->th);
815 * Transmit all messages in the peer's message queue.
817 * @param peer message queue to process
820 process_peer_queue (struct PeerInfo *peer)
822 struct P2PPendingMessage *pending;
824 if (NULL == (pending = peer->head))
826 if (NULL != peer->th)
828 GNUNET_STATISTICS_update (GDS_stats,
830 ("# Bytes of bandwidth requested from core"),
831 ntohs (pending->msg->size), GNUNET_NO);
833 GNUNET_CORE_notify_transmit_ready (coreAPI, GNUNET_YES,
835 GNUNET_TIME_absolute_get_remaining
836 (pending->timeout), &peer->id,
837 ntohs (pending->msg->size),
838 &core_transmit_notify, peer);
839 GNUNET_break (NULL != peer->th);
844 * To how many peers should we (on average) forward the request to
845 * obtain the desired target_replication count (on average).
847 * @param hop_count number of hops the message has traversed
848 * @param target_replication the number of total paths desired
849 * @return Some number of peers to forward the message to
852 get_forward_count (uint32_t hop_count, uint32_t target_replication)
854 uint32_t random_value;
855 uint32_t forward_count;
858 if (hop_count > GDS_NSE_get () * 6.0)
860 /* forcefully terminate */
863 if (hop_count > GDS_NSE_get () * 4.0)
865 /* Once we have reached our ideal number of hops, only forward to 1 peer */
868 /* bound by system-wide maximum */
870 GNUNET_MIN (MAXIMUM_REPLICATION_LEVEL, target_replication);
872 1 + (target_replication - 1.0) / (GDS_NSE_get () +
873 ((float) (target_replication - 1.0) *
875 /* Set forward count to floor of target_value */
876 forward_count = (uint32_t) target_value;
877 /* Subtract forward_count (floor) from target_value (yields value between 0 and 1) */
878 target_value = target_value - forward_count;
880 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, UINT32_MAX);
881 if (random_value < (target_value * UINT32_MAX))
883 return forward_count;
888 * Compute the distance between have and target as a 32-bit value.
889 * Differences in the lower bits must count stronger than differences
890 * in the higher bits.
892 * @return 0 if have==target, otherwise a number
893 * that is larger as the distance between
894 * the two hash codes increases
897 get_distance (const struct GNUNET_HashCode * target, const struct GNUNET_HashCode * have)
904 /* We have to represent the distance between two 2^9 (=512)-bit
905 * numbers as a 2^5 (=32)-bit number with "0" being used for the
906 * two numbers being identical; furthermore, we need to
907 * guarantee that a difference in the number of matching
908 * bits is always represented in the result.
910 * We use 2^32/2^9 numerical values to distinguish between
911 * hash codes that have the same LSB bit distance and
912 * use the highest 2^9 bits of the result to signify the
913 * number of (mis)matching LSB bits; if we have 0 matching
914 * and hence 512 mismatching LSB bits we return -1 (since
915 * 512 itself cannot be represented with 9 bits) */
917 /* first, calculate the most significant 9 bits of our
918 * result, aka the number of LSBs */
919 bucket = GNUNET_CRYPTO_hash_matching_bits (target, have);
920 /* bucket is now a value between 0 and 512 */
922 return 0; /* perfect match */
924 return (unsigned int) -1; /* LSB differs; use max (if we did the bit-shifting
925 * below, we'd end up with max+1 (overflow)) */
927 /* calculate the most significant bits of the final result */
928 msb = (512 - bucket) << (32 - 9);
929 /* calculate the 32-9 least significant bits of the final result by
930 * looking at the differences in the 32-9 bits following the
931 * mismatching bit at 'bucket' */
934 (i < sizeof (struct GNUNET_HashCode) * 8) && (i < bucket + 1 + 32 - 9); i++)
936 if (GNUNET_CRYPTO_hash_get_bit (target, i) !=
937 GNUNET_CRYPTO_hash_get_bit (have, i))
938 lsb |= (1 << (bucket + 32 - 9 - i)); /* first bit set will be 10,
939 * last bit set will be 31 -- if
940 * i does not reach 512 first... */
947 * Check whether my identity is closer than any known peers. If a
948 * non-null bloomfilter is given, check if this is the closest peer
949 * that hasn't already been routed to.
951 * @param key hash code to check closeness to
952 * @param bloom bloomfilter, exclude these entries from the decision
953 * @return GNUNET_YES if node location is closest,
954 * GNUNET_NO otherwise.
957 am_closest_peer (const struct GNUNET_HashCode * key,
958 const struct GNUNET_CONTAINER_BloomFilter *bloom)
964 struct PeerInfo *pos;
966 if (0 == memcmp (&my_identity.hashPubKey, key, sizeof (struct GNUNET_HashCode)))
968 bucket_num = find_bucket (key);
969 GNUNET_assert (bucket_num >= 0);
970 bits = GNUNET_CRYPTO_hash_matching_bits (&my_identity.hashPubKey, key);
971 pos = k_buckets[bucket_num].head;
973 while ((pos != NULL) && (count < bucket_size))
975 if ((bloom != NULL) &&
977 GNUNET_CONTAINER_bloomfilter_test (bloom, &pos->id.hashPubKey)))
980 continue; /* Skip already checked entries */
982 other_bits = GNUNET_CRYPTO_hash_matching_bits (&pos->id.hashPubKey, key);
983 if (other_bits > bits)
985 if (other_bits == bits) /* We match the same number of bits */
989 /* No peers closer, we are the closest! */
995 * Select a peer from the routing table that would be a good routing
996 * destination for sending a message for "key". The resulting peer
997 * must not be in the set of blocked peers.<p>
999 * Note that we should not ALWAYS select the closest peer to the
1000 * target, peers further away from the target should be chosen with
1001 * exponentially declining probability.
1003 * FIXME: double-check that this is fine
1006 * @param key the key we are selecting a peer to route to
1007 * @param bloom a bloomfilter containing entries this request has seen already
1008 * @param hops how many hops has this message traversed thus far
1009 * @return Peer to route to, or NULL on error
1011 static struct PeerInfo *
1012 select_peer (const struct GNUNET_HashCode * key,
1013 const struct GNUNET_CONTAINER_BloomFilter *bloom, uint32_t hops)
1017 unsigned int selected;
1018 struct PeerInfo *pos;
1020 unsigned int smallest_distance;
1021 struct PeerInfo *chosen;
1023 if (hops >= GDS_NSE_get ())
1025 /* greedy selection (closest peer that is not in bloomfilter) */
1026 smallest_distance = UINT_MAX;
1028 for (bc = 0; bc <= closest_bucket; bc++)
1030 pos = k_buckets[bc].head;
1032 while ((pos != NULL) && (count < bucket_size))
1034 if ((bloom == NULL) ||
1036 GNUNET_CONTAINER_bloomfilter_test (bloom, &pos->id.hashPubKey)))
1038 dist = get_distance (key, &pos->id.hashPubKey);
1039 if (dist < smallest_distance)
1042 smallest_distance = dist;
1047 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1048 "Excluded peer `%s' due to BF match in greedy routing for %s\n",
1049 GNUNET_i2s (&pos->id), GNUNET_h2s (key));
1050 GNUNET_STATISTICS_update (GDS_stats,
1052 ("# Peers excluded from routing due to Bloomfilter"),
1060 GNUNET_STATISTICS_update (GDS_stats,
1061 gettext_noop ("# Peer selection failed"), 1,
1066 /* select "random" peer */
1067 /* count number of peers that are available and not filtered */
1069 for (bc = 0; bc <= closest_bucket; bc++)
1071 pos = k_buckets[bc].head;
1072 while ((pos != NULL) && (count < bucket_size))
1074 if ((bloom != NULL) &&
1076 GNUNET_CONTAINER_bloomfilter_test (bloom, &pos->id.hashPubKey)))
1078 GNUNET_STATISTICS_update (GDS_stats,
1080 ("# Peers excluded from routing due to Bloomfilter"),
1082 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1083 "Excluded peer `%s' due to BF match in random routing for %s\n",
1084 GNUNET_i2s (&pos->id), GNUNET_h2s (key));
1086 continue; /* Ignore bloomfiltered peers */
1092 if (count == 0) /* No peers to select from! */
1094 GNUNET_STATISTICS_update (GDS_stats,
1095 gettext_noop ("# Peer selection failed"), 1,
1099 /* Now actually choose a peer */
1100 selected = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, count);
1102 for (bc = 0; bc <= closest_bucket; bc++)
1104 for (pos = k_buckets[bc].head; ((pos != NULL) && (count < bucket_size)); pos = pos->next)
1106 if ((bloom != NULL) &&
1108 GNUNET_CONTAINER_bloomfilter_test (bloom, &pos->id.hashPubKey)))
1110 continue; /* Ignore bloomfiltered peers */
1112 if (0 == selected--)
1122 * Compute the set of peers that the given request should be
1125 * @param key routing key
1126 * @param bloom bloom filter excluding peers as targets, all selected
1127 * peers will be added to the bloom filter
1128 * @param hop_count number of hops the request has traversed so far
1129 * @param target_replication desired number of replicas
1130 * @param targets where to store an array of target peers (to be
1131 * free'd by the caller)
1132 * @return number of peers returned in 'targets'.
1135 get_target_peers (const struct GNUNET_HashCode *key,
1136 struct GNUNET_CONTAINER_BloomFilter *bloom,
1137 uint32_t hop_count, uint32_t target_replication,
1138 struct PeerInfo ***targets)
1142 struct PeerInfo **rtargets;
1143 struct PeerInfo *nxt;
1145 GNUNET_assert (NULL != bloom);
1146 ret = get_forward_count (hop_count, target_replication);
1152 rtargets = GNUNET_malloc (sizeof (struct PeerInfo *) * ret);
1153 for (off = 0; off < ret; off++)
1155 nxt = select_peer (key, bloom, hop_count);
1158 rtargets[off] = nxt;
1159 GNUNET_break (GNUNET_NO ==
1160 GNUNET_CONTAINER_bloomfilter_test (bloom,
1161 &nxt->id.hashPubKey));
1162 GNUNET_CONTAINER_bloomfilter_add (bloom, &rtargets[off]->id.hashPubKey);
1164 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1165 "Selected %u/%u peers at hop %u for %s (target was %u)\n", off,
1166 GNUNET_CONTAINER_multihashmap_size (all_known_peers),
1167 (unsigned int) hop_count, GNUNET_h2s (key), ret);
1170 GNUNET_free (rtargets);
1174 *targets = rtargets;
1175 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1176 "Forwarding query `%s' to %u peers (goal was %u peers)\n",
1185 * Perform a PUT operation. Forwards the given request to other
1186 * peers. Does not store the data locally. Does not give the
1187 * data to local clients. May do nothing if this is the only
1188 * peer in the network (or if we are the closest peer in the
1191 * @param type type of the block
1192 * @param options routing options
1193 * @param desired_replication_level desired replication count
1194 * @param expiration_time when does the content expire
1195 * @param hop_count how many hops has this message traversed so far
1196 * @param bf Bloom filter of peers this PUT has already traversed
1197 * @param key key for the content
1198 * @param put_path_length number of entries in put_path
1199 * @param put_path peers this request has traversed so far (if tracked)
1200 * @param data payload to store
1201 * @param data_size number of bytes in data
1204 GDS_NEIGHBOURS_handle_put (enum GNUNET_BLOCK_Type type,
1205 enum GNUNET_DHT_RouteOption options,
1206 uint32_t desired_replication_level,
1207 struct GNUNET_TIME_Absolute expiration_time,
1209 struct GNUNET_CONTAINER_BloomFilter *bf,
1210 const struct GNUNET_HashCode * key,
1211 unsigned int put_path_length,
1212 struct GNUNET_PeerIdentity *put_path,
1213 const void *data, size_t data_size)
1215 unsigned int target_count;
1217 struct PeerInfo **targets;
1218 struct PeerInfo *target;
1219 struct P2PPendingMessage *pending;
1221 struct PeerPutMessage *ppm;
1222 struct GNUNET_PeerIdentity *pp;
1224 GNUNET_assert (NULL != bf);
1225 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1226 "Adding myself (%s) to PUT bloomfilter for %s\n",
1227 GNUNET_i2s (&my_identity), GNUNET_h2s (key));
1228 GNUNET_CONTAINER_bloomfilter_add (bf, &my_identity.hashPubKey);
1229 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# PUT requests routed"),
1232 get_target_peers (key, bf, hop_count, desired_replication_level,
1234 if (0 == target_count)
1236 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1237 "Routing PUT for %s terminates after %u hops at %s\n",
1238 GNUNET_h2s (key), (unsigned int) hop_count,
1239 GNUNET_i2s (&my_identity));
1243 put_path_length * sizeof (struct GNUNET_PeerIdentity) + data_size +
1244 sizeof (struct PeerPutMessage);
1245 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1247 put_path_length = 0;
1248 msize = data_size + sizeof (struct PeerPutMessage);
1250 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1253 GNUNET_free (targets);
1256 GNUNET_STATISTICS_update (GDS_stats,
1258 ("# PUT messages queued for transmission"),
1259 target_count, GNUNET_NO);
1260 for (i = 0; i < target_count; i++)
1262 target = targets[i];
1263 if (target->pending_count >= MAXIMUM_PENDING_PER_PEER)
1265 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# P2P messages dropped due to full queue"),
1267 continue; /* skip */
1269 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1270 "Routing PUT for %s after %u hops to %s\n", GNUNET_h2s (key),
1271 (unsigned int) hop_count, GNUNET_i2s (&target->id));
1272 pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
1273 pending->importance = 0; /* FIXME */
1274 pending->timeout = expiration_time;
1275 ppm = (struct PeerPutMessage *) &pending[1];
1276 pending->msg = &ppm->header;
1277 ppm->header.size = htons (msize);
1278 ppm->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_P2P_PUT);
1279 ppm->options = htonl (options);
1280 ppm->type = htonl (type);
1281 ppm->hop_count = htonl (hop_count + 1);
1282 ppm->desired_replication_level = htonl (desired_replication_level);
1283 ppm->put_path_length = htonl (put_path_length);
1284 ppm->expiration_time = GNUNET_TIME_absolute_hton (expiration_time);
1285 GNUNET_break (GNUNET_YES ==
1286 GNUNET_CONTAINER_bloomfilter_test (bf,
1287 &target->id.hashPubKey));
1288 GNUNET_assert (GNUNET_OK ==
1289 GNUNET_CONTAINER_bloomfilter_get_raw_data (bf,
1293 pp = (struct GNUNET_PeerIdentity *) &ppm[1];
1294 memcpy (pp, put_path,
1295 sizeof (struct GNUNET_PeerIdentity) * put_path_length);
1296 memcpy (&pp[put_path_length], data, data_size);
1297 GNUNET_CONTAINER_DLL_insert_tail (target->head, target->tail, pending);
1298 target->pending_count++;
1299 process_peer_queue (target);
1301 GNUNET_free (targets);
1306 * Perform a GET operation. Forwards the given request to other
1307 * peers. Does not lookup the key locally. May do nothing if this is
1308 * the only peer in the network (or if we are the closest peer in the
1311 * @param type type of the block
1312 * @param options routing options
1313 * @param desired_replication_level desired replication count
1314 * @param hop_count how many hops did this request traverse so far?
1315 * @param key key for the content
1316 * @param xquery extended query
1317 * @param xquery_size number of bytes in xquery
1318 * @param reply_bf bloomfilter to filter duplicates
1319 * @param reply_bf_mutator mutator for reply_bf
1320 * @param peer_bf filter for peers not to select (again)
1323 GDS_NEIGHBOURS_handle_get (enum GNUNET_BLOCK_Type type,
1324 enum GNUNET_DHT_RouteOption options,
1325 uint32_t desired_replication_level,
1326 uint32_t hop_count, const struct GNUNET_HashCode * key,
1327 const void *xquery, size_t xquery_size,
1328 const struct GNUNET_CONTAINER_BloomFilter *reply_bf,
1329 uint32_t reply_bf_mutator,
1330 struct GNUNET_CONTAINER_BloomFilter *peer_bf)
1332 unsigned int target_count;
1334 struct PeerInfo **targets;
1335 struct PeerInfo *target;
1336 struct P2PPendingMessage *pending;
1338 struct PeerGetMessage *pgm;
1340 size_t reply_bf_size;
1342 GNUNET_assert (NULL != peer_bf);
1343 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# GET requests routed"),
1346 get_target_peers (key, peer_bf, hop_count, desired_replication_level,
1348 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1349 "Adding myself (%s) to GET bloomfilter for %s\n",
1350 GNUNET_i2s (&my_identity), GNUNET_h2s (key));
1351 GNUNET_CONTAINER_bloomfilter_add (peer_bf, &my_identity.hashPubKey);
1352 if (0 == target_count)
1354 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1355 "Routing GET for %s terminates after %u hops at %s\n",
1356 GNUNET_h2s (key), (unsigned int) hop_count,
1357 GNUNET_i2s (&my_identity));
1360 reply_bf_size = GNUNET_CONTAINER_bloomfilter_get_size (reply_bf);
1361 msize = xquery_size + sizeof (struct PeerGetMessage) + reply_bf_size;
1362 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1365 GNUNET_free (targets);
1368 GNUNET_STATISTICS_update (GDS_stats,
1370 ("# GET messages queued for transmission"),
1371 target_count, GNUNET_NO);
1372 /* forward request */
1373 for (i = 0; i < target_count; i++)
1375 target = targets[i];
1376 if (target->pending_count >= MAXIMUM_PENDING_PER_PEER)
1378 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# P2P messages dropped due to full queue"),
1380 continue; /* skip */
1382 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1383 "Routing GET for %s after %u hops to %s\n", GNUNET_h2s (key),
1384 (unsigned int) hop_count, GNUNET_i2s (&target->id));
1385 pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
1386 pending->importance = 0; /* FIXME */
1387 pending->timeout = GNUNET_TIME_relative_to_absolute (GET_TIMEOUT);
1388 pgm = (struct PeerGetMessage *) &pending[1];
1389 pending->msg = &pgm->header;
1390 pgm->header.size = htons (msize);
1391 pgm->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_P2P_GET);
1392 pgm->options = htonl (options);
1393 pgm->type = htonl (type);
1394 pgm->hop_count = htonl (hop_count + 1);
1395 pgm->desired_replication_level = htonl (desired_replication_level);
1396 pgm->xquery_size = htonl (xquery_size);
1397 pgm->bf_mutator = reply_bf_mutator;
1398 GNUNET_break (GNUNET_YES ==
1399 GNUNET_CONTAINER_bloomfilter_test (peer_bf,
1400 &target->id.hashPubKey));
1401 GNUNET_assert (GNUNET_OK ==
1402 GNUNET_CONTAINER_bloomfilter_get_raw_data (peer_bf,
1406 xq = (char *) &pgm[1];
1407 memcpy (xq, xquery, xquery_size);
1408 if (NULL != reply_bf)
1409 GNUNET_assert (GNUNET_OK ==
1410 GNUNET_CONTAINER_bloomfilter_get_raw_data (reply_bf,
1414 GNUNET_CONTAINER_DLL_insert_tail (target->head, target->tail, pending);
1415 target->pending_count++;
1416 process_peer_queue (target);
1418 GNUNET_free (targets);
1423 * Handle a reply (route to origin). Only forwards the reply back to
1424 * the given peer. Does not do local caching or forwarding to local
1427 * @param target neighbour that should receive the block (if still connected)
1428 * @param type type of the block
1429 * @param expiration_time when does the content expire
1430 * @param key key for the content
1431 * @param put_path_length number of entries in put_path
1432 * @param put_path peers the original PUT traversed (if tracked)
1433 * @param get_path_length number of entries in put_path
1434 * @param get_path peers this reply has traversed so far (if tracked)
1435 * @param data payload of the reply
1436 * @param data_size number of bytes in data
1439 GDS_NEIGHBOURS_handle_reply (const struct GNUNET_PeerIdentity *target,
1440 enum GNUNET_BLOCK_Type type,
1441 struct GNUNET_TIME_Absolute expiration_time,
1442 const struct GNUNET_HashCode * key,
1443 unsigned int put_path_length,
1444 const struct GNUNET_PeerIdentity *put_path,
1445 unsigned int get_path_length,
1446 const struct GNUNET_PeerIdentity *get_path,
1447 const void *data, size_t data_size)
1449 struct PeerInfo *pi;
1450 struct P2PPendingMessage *pending;
1452 struct PeerResultMessage *prm;
1453 struct GNUNET_PeerIdentity *paths;
1456 data_size + sizeof (struct PeerResultMessage) + (get_path_length +
1458 sizeof (struct GNUNET_PeerIdentity);
1459 if ((msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE) ||
1461 GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)) ||
1463 GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)) ||
1464 (data_size > GNUNET_SERVER_MAX_MESSAGE_SIZE))
1469 pi = GNUNET_CONTAINER_multihashmap_get (all_known_peers, &target->hashPubKey);
1472 /* peer disconnected in the meantime, drop reply */
1475 if (pi->pending_count >= MAXIMUM_PENDING_PER_PEER)
1478 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# P2P messages dropped due to full queue"),
1483 GNUNET_STATISTICS_update (GDS_stats,
1485 ("# RESULT messages queued for transmission"), 1,
1487 pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
1488 pending->importance = 0; /* FIXME */
1489 pending->timeout = expiration_time;
1490 prm = (struct PeerResultMessage *) &pending[1];
1491 pending->msg = &prm->header;
1492 prm->header.size = htons (msize);
1493 prm->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_P2P_RESULT);
1494 prm->type = htonl (type);
1495 prm->put_path_length = htonl (put_path_length);
1496 prm->get_path_length = htonl (get_path_length);
1497 prm->expiration_time = GNUNET_TIME_absolute_hton (expiration_time);
1499 paths = (struct GNUNET_PeerIdentity *) &prm[1];
1500 memcpy (paths, put_path,
1501 put_path_length * sizeof (struct GNUNET_PeerIdentity));
1502 memcpy (&paths[put_path_length], get_path,
1503 get_path_length * sizeof (struct GNUNET_PeerIdentity));
1504 memcpy (&paths[put_path_length + get_path_length], data, data_size);
1505 GNUNET_CONTAINER_DLL_insert (pi->head, pi->tail, pending);
1506 pi->pending_count++;
1507 process_peer_queue (pi);
1512 * To be called on core init/fail.
1514 * @param cls service closure
1515 * @param server handle to the server for this service
1516 * @param identity the public identity of this peer
1519 core_init (void *cls, struct GNUNET_CORE_Handle *server,
1520 const struct GNUNET_PeerIdentity *identity)
1522 GNUNET_assert (server != NULL);
1523 my_identity = *identity;
1528 * Core handler for p2p put requests.
1530 * @param cls closure
1531 * @param peer sender of the request
1532 * @param message message
1533 * @param peer peer identity this notification is about
1534 * @param atsi performance data
1535 * @param atsi_count number of records in 'atsi'
1536 * @return GNUNET_OK to keep the connection open,
1537 * GNUNET_SYSERR to close it (signal serious error)
1540 handle_dht_p2p_put (void *cls, const struct GNUNET_PeerIdentity *peer,
1541 const struct GNUNET_MessageHeader *message,
1542 const struct GNUNET_ATS_Information *atsi,
1543 unsigned int atsi_count)
1545 const struct PeerPutMessage *put;
1546 const struct GNUNET_PeerIdentity *put_path;
1547 const void *payload;
1550 size_t payload_size;
1551 enum GNUNET_DHT_RouteOption options;
1552 struct GNUNET_CONTAINER_BloomFilter *bf;
1553 struct GNUNET_HashCode test_key;
1555 msize = ntohs (message->size);
1556 if (msize < sizeof (struct PeerPutMessage))
1558 GNUNET_break_op (0);
1561 put = (const struct PeerPutMessage *) message;
1562 putlen = ntohl (put->put_path_length);
1564 sizeof (struct PeerPutMessage) +
1565 putlen * sizeof (struct GNUNET_PeerIdentity)) ||
1567 GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)))
1569 GNUNET_break_op (0);
1572 GNUNET_STATISTICS_update (GDS_stats,
1573 gettext_noop ("# P2P PUT requests received"), 1,
1575 put_path = (const struct GNUNET_PeerIdentity *) &put[1];
1576 payload = &put_path[putlen];
1577 options = ntohl (put->options);
1579 msize - (sizeof (struct PeerPutMessage) +
1580 putlen * sizeof (struct GNUNET_PeerIdentity));
1581 switch (GNUNET_BLOCK_get_key
1582 (GDS_block_context, ntohl (put->type), payload, payload_size,
1586 if (0 != memcmp (&test_key, &put->key, sizeof (struct GNUNET_HashCode)))
1588 GNUNET_break_op (0);
1593 GNUNET_break_op (0);
1596 /* cannot verify, good luck */
1599 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "PUT for `%s' from %s\n",
1600 GNUNET_h2s (&put->key), GNUNET_i2s (peer));
1602 if (LOG_ROUTE_DETAILS_STDERR)
1606 tmp = GNUNET_strdup (GNUNET_i2s (&my_identity));
1607 fprintf (stderr, "XDHT PUT %s: %s(%u)<-%s\n",
1608 GNUNET_h2s (&put->key), tmp, getpid (),
1614 bf = GNUNET_CONTAINER_bloomfilter_init (put->bloomfilter, DHT_BLOOM_SIZE,
1615 GNUNET_CONSTANTS_BLOOMFILTER_K);
1616 GNUNET_break_op (GNUNET_YES ==
1617 GNUNET_CONTAINER_bloomfilter_test (bf, &peer->hashPubKey));
1619 struct GNUNET_PeerIdentity pp[putlen + 1];
1621 /* extend 'put path' by sender */
1622 if (0 != (options & GNUNET_DHT_RO_RECORD_ROUTE))
1624 memcpy (pp, put_path, putlen * sizeof (struct GNUNET_PeerIdentity));
1631 /* give to local clients */
1632 GDS_CLIENTS_handle_reply (GNUNET_TIME_absolute_ntoh (put->expiration_time),
1633 &put->key, 0, NULL, putlen, pp, ntohl (put->type),
1634 payload_size, payload);
1636 if ((0 != (options & GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE)) ||
1637 (am_closest_peer (&put->key, bf)))
1638 GDS_DATACACHE_handle_put (GNUNET_TIME_absolute_ntoh
1639 (put->expiration_time), &put->key, putlen, pp,
1640 ntohl (put->type), payload_size, payload);
1641 /* route to other peers */
1642 GDS_NEIGHBOURS_handle_put (ntohl (put->type), options,
1643 ntohl (put->desired_replication_level),
1644 GNUNET_TIME_absolute_ntoh (put->expiration_time),
1645 ntohl (put->hop_count), bf, &put->key, putlen,
1646 pp, payload, payload_size);
1647 /* notify monitoring clients */
1648 GDS_CLIENTS_process_put (options,
1650 ntohl (put->hop_count),
1651 ntohl (put->desired_replication_level),
1653 GNUNET_TIME_absolute_ntoh (put->expiration_time),
1658 GNUNET_CONTAINER_bloomfilter_free (bf);
1664 * We have received a FIND PEER request. Send matching
1667 * @param sender sender of the FIND PEER request
1668 * @param key peers close to this key are desired
1669 * @param bf peers matching this bf are excluded
1670 * @param bf_mutator mutator for bf
1673 handle_find_peer (const struct GNUNET_PeerIdentity *sender,
1674 const struct GNUNET_HashCode * key,
1675 struct GNUNET_CONTAINER_BloomFilter *bf, uint32_t bf_mutator)
1678 struct PeerBucket *bucket;
1679 struct PeerInfo *peer;
1680 unsigned int choice;
1681 struct GNUNET_HashCode mhash;
1682 const struct GNUNET_HELLO_Message *hello;
1684 /* first, check about our own HELLO */
1685 if (NULL != GDS_my_hello)
1687 GNUNET_BLOCK_mingle_hash (&my_identity.hashPubKey, bf_mutator, &mhash);
1689 (GNUNET_YES != GNUNET_CONTAINER_bloomfilter_test (bf, &mhash)))
1691 GDS_NEIGHBOURS_handle_reply (sender, GNUNET_BLOCK_TYPE_DHT_HELLO,
1692 GNUNET_TIME_relative_to_absolute
1694 key, 0, NULL, 0, NULL, GDS_my_hello,
1695 GNUNET_HELLO_size ((const struct
1696 GNUNET_HELLO_Message *)
1701 GNUNET_STATISTICS_update (GDS_stats,
1703 ("# FIND PEER requests ignored due to Bloomfilter"),
1709 GNUNET_STATISTICS_update (GDS_stats,
1711 ("# FIND PEER requests ignored due to lack of HELLO"),
1715 /* then, also consider sending a random HELLO from the closest bucket */
1716 if (0 == memcmp (&my_identity.hashPubKey, key, sizeof (struct GNUNET_HashCode)))
1717 bucket_idx = closest_bucket;
1719 bucket_idx = GNUNET_MIN (closest_bucket, find_bucket (key));
1720 if (bucket_idx == GNUNET_SYSERR)
1722 bucket = &k_buckets[bucket_idx];
1723 if (bucket->peers_size == 0)
1726 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, bucket->peers_size);
1727 peer = bucket->head;
1730 GNUNET_assert (peer != NULL);
1734 choice = bucket->peers_size;
1739 return; /* no non-masked peer available */
1741 peer = bucket->head;
1742 GNUNET_BLOCK_mingle_hash (&peer->id.hashPubKey, bf_mutator, &mhash);
1743 hello = GDS_HELLO_get (&peer->id);
1745 while ((hello == NULL) ||
1746 (GNUNET_YES == GNUNET_CONTAINER_bloomfilter_test (bf, &mhash)));
1747 GDS_NEIGHBOURS_handle_reply (sender, GNUNET_BLOCK_TYPE_DHT_HELLO,
1748 GNUNET_TIME_relative_to_absolute
1749 (GNUNET_CONSTANTS_HELLO_ADDRESS_EXPIRATION), key,
1750 0, NULL, 0, NULL, hello,
1751 GNUNET_HELLO_size (hello));
1756 * Core handler for p2p get requests.
1758 * @param cls closure
1759 * @param peer sender of the request
1760 * @param message message
1761 * @param peer peer identity this notification is about
1762 * @param atsi performance data
1763 * @param atsi_count number of records in 'atsi'
1764 * @return GNUNET_OK to keep the connection open,
1765 * GNUNET_SYSERR to close it (signal serious error)
1768 handle_dht_p2p_get (void *cls, const struct GNUNET_PeerIdentity *peer,
1769 const struct GNUNET_MessageHeader *message,
1770 const struct GNUNET_ATS_Information *atsi,
1771 unsigned int atsi_count)
1773 struct PeerGetMessage *get;
1774 uint32_t xquery_size;
1775 size_t reply_bf_size;
1777 enum GNUNET_BLOCK_Type type;
1778 enum GNUNET_DHT_RouteOption options;
1779 enum GNUNET_BLOCK_EvaluationResult eval;
1780 struct GNUNET_CONTAINER_BloomFilter *reply_bf;
1781 struct GNUNET_CONTAINER_BloomFilter *peer_bf;
1785 memcmp (peer, &my_identity,
1786 sizeof (struct GNUNET_PeerIdentity)));
1787 /* parse and validate message */
1788 msize = ntohs (message->size);
1789 if (msize < sizeof (struct PeerGetMessage))
1791 GNUNET_break_op (0);
1794 get = (struct PeerGetMessage *) message;
1795 xquery_size = ntohl (get->xquery_size);
1796 if (msize < sizeof (struct PeerGetMessage) + xquery_size)
1798 GNUNET_break_op (0);
1801 GNUNET_STATISTICS_update (GDS_stats,
1802 gettext_noop ("# P2P GET requests received"), 1,
1804 reply_bf_size = msize - (sizeof (struct PeerGetMessage) + xquery_size);
1805 type = ntohl (get->type);
1806 options = ntohl (get->options);
1807 xquery = (const char *) &get[1];
1809 if (reply_bf_size > 0)
1811 GNUNET_CONTAINER_bloomfilter_init (&xquery[xquery_size], reply_bf_size,
1812 GNUNET_CONSTANTS_BLOOMFILTER_K);
1814 GNUNET_BLOCK_evaluate (GDS_block_context, type, &get->key, &reply_bf,
1815 get->bf_mutator, xquery, xquery_size, NULL, 0);
1816 if (eval != GNUNET_BLOCK_EVALUATION_REQUEST_VALID)
1818 /* request invalid or block type not supported */
1819 GNUNET_break_op (eval == GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED);
1820 if (NULL != reply_bf)
1821 GNUNET_CONTAINER_bloomfilter_free (reply_bf);
1825 GNUNET_CONTAINER_bloomfilter_init (get->bloomfilter, DHT_BLOOM_SIZE,
1826 GNUNET_CONSTANTS_BLOOMFILTER_K);
1827 GNUNET_break_op (GNUNET_YES ==
1828 GNUNET_CONTAINER_bloomfilter_test (peer_bf,
1829 &peer->hashPubKey));
1830 /* remember request for routing replies */
1831 GDS_ROUTING_add (peer, type, options, &get->key, xquery, xquery_size,
1832 reply_bf, get->bf_mutator);
1833 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "GET for %s at %s after %u hops\n",
1834 GNUNET_h2s (&get->key), GNUNET_i2s (&my_identity),
1835 (unsigned int) ntohl (get->hop_count));
1836 /* local lookup (this may update the reply_bf) */
1837 if ((0 != (options & GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE)) ||
1838 (am_closest_peer (&get->key, peer_bf)))
1840 if ((0 != (options & GNUNET_DHT_RO_FIND_PEER)))
1842 GNUNET_STATISTICS_update (GDS_stats,
1844 ("# P2P FIND PEER requests processed"), 1,
1846 handle_find_peer (peer, &get->key, reply_bf, get->bf_mutator);
1851 GDS_DATACACHE_handle_get (&get->key, type, xquery, xquery_size,
1852 &reply_bf, get->bf_mutator);
1857 GNUNET_STATISTICS_update (GDS_stats,
1858 gettext_noop ("# P2P GET requests ONLY routed"),
1862 if (LOG_ROUTE_DETAILS_STDERR)
1866 tmp = GNUNET_strdup (GNUNET_i2s (&my_identity));
1867 fprintf (stderr, "XDHT GET %s: %s(%u)<-%s\n",
1868 GNUNET_h2s (&get->key), tmp, getpid(),
1873 GDS_CLIENTS_process_get (options,
1875 ntohl(get->hop_count),
1876 ntohl(get->desired_replication_level),
1880 /* P2P forwarding */
1881 if (eval != GNUNET_BLOCK_EVALUATION_OK_LAST)
1882 GDS_NEIGHBOURS_handle_get (type, options,
1883 ntohl (get->desired_replication_level),
1884 ntohl (get->hop_count), &get->key, xquery,
1885 xquery_size, reply_bf, get->bf_mutator, peer_bf);
1887 if (NULL != reply_bf)
1888 GNUNET_CONTAINER_bloomfilter_free (reply_bf);
1889 GNUNET_CONTAINER_bloomfilter_free (peer_bf);
1895 * Core handler for p2p result messages.
1897 * @param cls closure
1898 * @param message message
1899 * @param peer peer identity this notification is about
1900 * @param atsi performance data
1901 * @param atsi_count number of records in 'atsi'
1902 * @return GNUNET_YES (do not cut p2p connection)
1905 handle_dht_p2p_result (void *cls, const struct GNUNET_PeerIdentity *peer,
1906 const struct GNUNET_MessageHeader *message,
1907 const struct GNUNET_ATS_Information *atsi,
1908 unsigned int atsi_count)
1910 const struct PeerResultMessage *prm;
1911 const struct GNUNET_PeerIdentity *put_path;
1912 const struct GNUNET_PeerIdentity *get_path;
1914 uint32_t get_path_length;
1915 uint32_t put_path_length;
1918 enum GNUNET_BLOCK_Type type;
1920 /* parse and validate message */
1921 msize = ntohs (message->size);
1922 if (msize < sizeof (struct PeerResultMessage))
1924 GNUNET_break_op (0);
1927 prm = (struct PeerResultMessage *) message;
1928 put_path_length = ntohl (prm->put_path_length);
1929 get_path_length = ntohl (prm->get_path_length);
1931 sizeof (struct PeerResultMessage) + (get_path_length +
1933 sizeof (struct GNUNET_PeerIdentity)) ||
1935 GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)) ||
1937 GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)))
1939 GNUNET_break_op (0);
1942 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# P2P RESULTS received"),
1944 put_path = (const struct GNUNET_PeerIdentity *) &prm[1];
1945 get_path = &put_path[put_path_length];
1946 type = ntohl (prm->type);
1947 data = (const void *) &get_path[get_path_length];
1949 msize - (sizeof (struct PeerResultMessage) +
1951 put_path_length) * sizeof (struct GNUNET_PeerIdentity));
1953 /* if we got a HELLO, consider it for our own routing table */
1954 if (type == GNUNET_BLOCK_TYPE_DHT_HELLO)
1956 const struct GNUNET_MessageHeader *h;
1957 struct GNUNET_PeerIdentity pid;
1960 /* Should be a HELLO, validate and consider using it! */
1961 if (data_size < sizeof (struct GNUNET_MessageHeader))
1963 GNUNET_break_op (0);
1967 if (data_size != ntohs (h->size))
1969 GNUNET_break_op (0);
1973 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) h, &pid))
1975 GNUNET_break_op (0);
1978 if (0 != memcmp (&my_identity, &pid, sizeof (struct GNUNET_PeerIdentity)))
1980 bucket = find_bucket (&pid.hashPubKey);
1981 if ((bucket >= 0) && (k_buckets[bucket].peers_size < bucket_size))
1983 if (NULL != GDS_transport_handle)
1985 GNUNET_TRANSPORT_offer_hello (GDS_transport_handle, h, NULL, NULL);
1986 if (GNUNET_YES != disable_try_connect)
1987 GNUNET_TRANSPORT_try_connect (GDS_transport_handle, &pid, NULL, NULL); /*FIXME TRY_CONNECT change */
1994 if (LOG_ROUTE_DETAILS_STDERR)
1998 tmp = GNUNET_strdup (GNUNET_i2s (&my_identity));
2000 "XDHT RESULT %s: %s(%u)<-%s\n",
2001 GNUNET_h2s (&prm->key), tmp,
2002 getpid(), GNUNET_i2s (peer));
2006 /* append 'peer' to 'get_path' */
2008 struct GNUNET_PeerIdentity xget_path[get_path_length + 1];
2010 memcpy (xget_path, get_path,
2011 get_path_length * sizeof (struct GNUNET_PeerIdentity));
2012 xget_path[get_path_length] = *peer;
2015 /* forward to local clients */
2016 GDS_CLIENTS_handle_reply (GNUNET_TIME_absolute_ntoh (prm->expiration_time),
2017 &prm->key, get_path_length, xget_path,
2018 put_path_length, put_path, type, data_size, data);
2019 GDS_CLIENTS_process_get_resp (type,
2020 xget_path, get_path_length,
2021 put_path, put_path_length,
2022 GNUNET_TIME_absolute_ntoh (
2023 prm->expiration_time),
2028 /* forward to other peers */
2029 GDS_ROUTING_process (type, GNUNET_TIME_absolute_ntoh (prm->expiration_time),
2030 &prm->key, put_path_length, put_path, get_path_length,
2031 xget_path, data, data_size);
2039 * Initialize neighbours subsystem.
2041 * @return GNUNET_OK on success, GNUNET_SYSERR on error
2044 GDS_NEIGHBOURS_init ()
2046 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
2047 {&handle_dht_p2p_get, GNUNET_MESSAGE_TYPE_DHT_P2P_GET, 0},
2048 {&handle_dht_p2p_put, GNUNET_MESSAGE_TYPE_DHT_P2P_PUT, 0},
2049 {&handle_dht_p2p_result, GNUNET_MESSAGE_TYPE_DHT_P2P_RESULT, 0},
2052 unsigned long long temp_config_num;
2055 = GNUNET_CONFIGURATION_get_value_yesno (GDS_cfg, "DHT", "DISABLE_TRY_CONNECT");
2057 GNUNET_CONFIGURATION_get_value_number (GDS_cfg, "DHT", "bucket_size",
2059 bucket_size = (unsigned int) temp_config_num;
2060 atsAPI = GNUNET_ATS_performance_init (GDS_cfg, NULL, NULL);
2062 GNUNET_CORE_connect (GDS_cfg, NULL, &core_init, &handle_core_connect,
2063 &handle_core_disconnect, NULL, GNUNET_NO, NULL,
2064 GNUNET_NO, core_handlers);
2065 if (coreAPI == NULL)
2066 return GNUNET_SYSERR;
2067 all_known_peers = GNUNET_CONTAINER_multihashmap_create (256, GNUNET_NO);
2073 * Shutdown neighbours subsystem.
2076 GDS_NEIGHBOURS_done ()
2078 if (coreAPI == NULL)
2080 GNUNET_CORE_disconnect (coreAPI);
2082 GNUNET_ATS_performance_done (atsAPI);
2084 GNUNET_assert (0 == GNUNET_CONTAINER_multihashmap_size (all_known_peers));
2085 GNUNET_CONTAINER_multihashmap_destroy (all_known_peers);
2086 all_known_peers = NULL;
2087 if (GNUNET_SCHEDULER_NO_TASK != find_peer_task)
2089 GNUNET_SCHEDULER_cancel (find_peer_task);
2090 find_peer_task = GNUNET_SCHEDULER_NO_TASK;
2095 * Get the ID of the local node.
2097 * @return identity of the local node
2099 struct GNUNET_PeerIdentity *
2100 GDS_NEIGHBOURS_get_id ()
2102 return &my_identity;
2106 /* end of gnunet-service-dht_neighbours.c */