2 This file is part of GNUnet.
3 (C) 2009-2013 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,
18 Boston, MA 02111-1307, USA.
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"
52 #define LOG_TRAFFIC(kind,...) GNUNET_log_from (kind, "dht-traffic",__VA_ARGS__)
55 * How many buckets will we allow total.
57 #define MAX_BUCKETS sizeof (struct GNUNET_HashCode) * 8
60 * What is the maximum number of peers in a given bucket.
62 #define DEFAULT_BUCKET_SIZE 8
65 * Desired replication level for FIND PEER requests
67 #define FIND_PEER_REPLICATION_LEVEL 4
70 * Maximum allowed replication level for all requests.
72 #define MAXIMUM_REPLICATION_LEVEL 16
75 * Maximum allowed number of pending messages per peer.
77 #define MAXIMUM_PENDING_PER_PEER 64
80 * How often to update our preference levels for peers in our routing tables.
82 #define DHT_DEFAULT_PREFERENCE_INTERVAL GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MINUTES, 2)
85 * How long at least to wait before sending another find peer request.
87 #define DHT_MINIMUM_FIND_PEER_INTERVAL GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 30)
90 * How long at most to wait before sending another find peer request.
92 #define DHT_MAXIMUM_FIND_PEER_INTERVAL GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MINUTES, 10)
95 * How long at most to wait for transmission of a GET request to another peer?
97 #define GET_TIMEOUT GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MINUTES, 2)
100 * Hello address expiration
102 extern struct GNUNET_TIME_Relative hello_expiration;
105 GNUNET_NETWORK_STRUCT_BEGIN
110 struct PeerPutMessage
113 * Type: GNUNET_MESSAGE_TYPE_DHT_P2P_PUT
115 struct GNUNET_MessageHeader header;
120 uint32_t options GNUNET_PACKED;
125 uint32_t type GNUNET_PACKED;
130 uint32_t hop_count GNUNET_PACKED;
133 * Replication level for this message
135 uint32_t desired_replication_level GNUNET_PACKED;
138 * Length of the PUT path that follows (if tracked).
140 uint32_t put_path_length GNUNET_PACKED;
143 * When does the content expire?
145 struct GNUNET_TIME_AbsoluteNBO expiration_time;
148 * Bloomfilter (for peer identities) to stop circular routes
150 char bloomfilter[DHT_BLOOM_SIZE];
153 * The key we are storing under.
155 struct GNUNET_HashCode key;
157 /* put path (if tracked) */
167 struct PeerResultMessage
170 * Type: GNUNET_MESSAGE_TYPE_DHT_P2P_RESULT
172 struct GNUNET_MessageHeader header;
177 uint32_t type GNUNET_PACKED;
180 * Length of the PUT path that follows (if tracked).
182 uint32_t put_path_length GNUNET_PACKED;
185 * Length of the GET path that follows (if tracked).
187 uint32_t get_path_length GNUNET_PACKED;
190 * When does the content expire?
192 struct GNUNET_TIME_AbsoluteNBO expiration_time;
195 * The key of the corresponding GET request.
197 struct GNUNET_HashCode key;
199 /* put path (if tracked) */
201 /* get path (if tracked) */
211 struct PeerGetMessage
214 * Type: GNUNET_MESSAGE_TYPE_DHT_P2P_GET
216 struct GNUNET_MessageHeader header;
221 uint32_t options GNUNET_PACKED;
224 * Desired content type.
226 uint32_t type GNUNET_PACKED;
231 uint32_t hop_count GNUNET_PACKED;
234 * Desired replication level for this request.
236 uint32_t desired_replication_level GNUNET_PACKED;
239 * Size of the extended query.
241 uint32_t xquery_size;
244 * Bloomfilter mutator.
249 * Bloomfilter (for peer identities) to stop circular routes
251 char bloomfilter[DHT_BLOOM_SIZE];
254 * The key we are looking for.
256 struct GNUNET_HashCode key;
260 /* result bloomfilter */
263 GNUNET_NETWORK_STRUCT_END
266 * Linked list of messages to send to a particular other peer.
268 struct P2PPendingMessage
271 * Pointer to next item in the list
273 struct P2PPendingMessage *next;
276 * Pointer to previous item in the list
278 struct P2PPendingMessage *prev;
281 * Message importance level. FIXME: used? useful?
283 unsigned int importance;
286 * When does this message time out?
288 struct GNUNET_TIME_Absolute timeout;
291 * Actual message to be sent, allocated at the end of the struct:
292 * // msg = (cast) &pm[1];
293 * // memcpy (&pm[1], data, len);
295 const struct GNUNET_MessageHeader *msg;
301 * Entry for a peer in a bucket.
306 * Next peer entry (DLL)
308 struct PeerInfo *next;
311 * Prev peer entry (DLL)
313 struct PeerInfo *prev;
316 * Count of outstanding messages for peer.
318 unsigned int pending_count;
321 * Head of pending messages to be sent to this peer.
323 struct P2PPendingMessage *head;
326 * Tail of pending messages to be sent to this peer.
328 struct P2PPendingMessage *tail;
331 * Core handle for sending messages to this peer.
333 struct GNUNET_CORE_TransmitHandle *th;
336 * Task for scheduling preference updates
338 GNUNET_SCHEDULER_TaskIdentifier preference_task;
341 * What is the identity of the peer?
343 struct GNUNET_PeerIdentity id;
347 * What is the average latency for replies received?
349 struct GNUNET_TIME_Relative latency;
352 * Transport level distance to peer.
354 unsigned int distance;
361 * Peers are grouped into buckets.
368 struct PeerInfo *head;
373 struct PeerInfo *tail;
376 * Number of peers in the bucket.
378 unsigned int peers_size;
382 * Should routing details be logged to stderr (for debugging)?
384 static int log_route_details_stderr;
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_us =
606 DHT_MINIMUM_FIND_PEER_INTERVAL.rel_value_us +
607 GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK,
608 DHT_MAXIMUM_FIND_PEER_INTERVAL.rel_value_us /
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
624 handle_core_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
626 struct PeerInfo *ret;
629 /* Check for connect to self message */
630 if (0 == memcmp (&my_identity, peer, sizeof (struct GNUNET_PeerIdentity)))
632 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connected %s to %s\n",
633 GNUNET_i2s (&my_identity), GNUNET_h2s (&peer->hashPubKey));
635 GNUNET_CONTAINER_multihashmap_contains (all_known_peers,
641 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# peers connected"), 1,
643 peer_bucket = find_bucket (&peer->hashPubKey);
644 GNUNET_assert ((peer_bucket >= 0) && (peer_bucket < MAX_BUCKETS));
645 ret = GNUNET_malloc (sizeof (struct PeerInfo));
647 ret->latency = latency;
648 ret->distance = distance;
651 GNUNET_CONTAINER_DLL_insert_tail (k_buckets[peer_bucket].head,
652 k_buckets[peer_bucket].tail, ret);
653 k_buckets[peer_bucket].peers_size++;
654 closest_bucket = GNUNET_MAX (closest_bucket, peer_bucket);
655 if ((peer_bucket > 0) && (k_buckets[peer_bucket].peers_size <= bucket_size))
657 ret->preference_task =
658 GNUNET_SCHEDULER_add_now (&update_core_preference, ret);
661 GNUNET_assert (GNUNET_OK ==
662 GNUNET_CONTAINER_multihashmap_put (all_known_peers,
663 &peer->hashPubKey, ret,
664 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
665 if (1 == GNUNET_CONTAINER_multihashmap_size (all_known_peers) &&
666 (GNUNET_YES != disable_try_connect))
668 /* got a first connection, good time to start with FIND PEER requests... */
669 find_peer_task = GNUNET_SCHEDULER_add_now (&send_find_peer_message, NULL);
675 * Method called whenever a peer disconnects.
678 * @param peer peer identity this notification is about
681 handle_core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
683 struct PeerInfo *to_remove;
685 struct P2PPendingMessage *pos;
686 unsigned int discarded;
688 /* Check for disconnect from self message */
689 if (0 == memcmp (&my_identity, peer, sizeof (struct GNUNET_PeerIdentity)))
691 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnected %s from %s\n",
692 GNUNET_i2s (&my_identity), GNUNET_h2s (&peer->hashPubKey));
694 GNUNET_CONTAINER_multihashmap_get (all_known_peers, &peer->hashPubKey);
695 if (NULL == to_remove)
700 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# peers connected"), -1,
702 GNUNET_assert (GNUNET_YES ==
703 GNUNET_CONTAINER_multihashmap_remove (all_known_peers,
706 if (GNUNET_SCHEDULER_NO_TASK != to_remove->preference_task)
708 GNUNET_SCHEDULER_cancel (to_remove->preference_task);
709 to_remove->preference_task = GNUNET_SCHEDULER_NO_TASK;
711 current_bucket = find_bucket (&to_remove->id.hashPubKey);
712 GNUNET_assert (current_bucket >= 0);
713 GNUNET_CONTAINER_DLL_remove (k_buckets[current_bucket].head,
714 k_buckets[current_bucket].tail, to_remove);
715 GNUNET_assert (k_buckets[current_bucket].peers_size > 0);
716 k_buckets[current_bucket].peers_size--;
717 while ((closest_bucket > 0) && (k_buckets[closest_bucket].peers_size == 0))
720 if (to_remove->th != NULL)
722 GNUNET_CORE_notify_transmit_ready_cancel (to_remove->th);
723 to_remove->th = NULL;
726 while (NULL != (pos = to_remove->head))
728 GNUNET_CONTAINER_DLL_remove (to_remove->head, to_remove->tail, pos);
732 GNUNET_STATISTICS_update (GDS_stats,
734 ("# Queued messages discarded (peer disconnected)"),
735 discarded, GNUNET_NO);
736 GNUNET_free (to_remove);
741 * Called when core is ready to send a message we asked for
742 * out to the destination.
744 * @param cls the 'struct PeerInfo' of the target peer
745 * @param size number of bytes available in buf
746 * @param buf where the callee should write the message
747 * @return number of bytes written to buf
750 core_transmit_notify (void *cls, size_t size, void *buf)
752 struct PeerInfo *peer = cls;
754 struct P2PPendingMessage *pending;
759 while ((NULL != (pending = peer->head)) &&
760 (0 == GNUNET_TIME_absolute_get_remaining (pending->timeout).rel_value_us))
762 peer->pending_count--;
763 GNUNET_CONTAINER_DLL_remove (peer->head, peer->tail, pending);
764 GNUNET_free (pending);
768 /* no messages pending */
774 GNUNET_CORE_notify_transmit_ready (coreAPI, GNUNET_NO,
776 GNUNET_TIME_absolute_get_remaining
777 (pending->timeout), &peer->id,
778 ntohs (pending->msg->size),
779 &core_transmit_notify, peer);
780 GNUNET_break (NULL != peer->th);
784 while ((NULL != (pending = peer->head)) &&
785 (size - off >= (msize = ntohs (pending->msg->size))))
787 GNUNET_STATISTICS_update (GDS_stats,
789 ("# Bytes transmitted to other peers"), msize,
791 memcpy (&cbuf[off], pending->msg, msize);
793 peer->pending_count--;
794 GNUNET_CONTAINER_DLL_remove (peer->head, peer->tail, pending);
795 GNUNET_free (pending);
797 if (peer->head != NULL)
800 GNUNET_CORE_notify_transmit_ready (coreAPI, GNUNET_NO,
802 GNUNET_TIME_absolute_get_remaining
803 (pending->timeout), &peer->id, msize,
804 &core_transmit_notify, peer);
805 GNUNET_break (NULL != peer->th);
812 * Transmit all messages in the peer's message queue.
814 * @param peer message queue to process
817 process_peer_queue (struct PeerInfo *peer)
819 struct P2PPendingMessage *pending;
821 if (NULL == (pending = peer->head))
823 if (NULL != peer->th)
825 GNUNET_STATISTICS_update (GDS_stats,
827 ("# Bytes of bandwidth requested from core"),
828 ntohs (pending->msg->size), GNUNET_NO);
830 GNUNET_CORE_notify_transmit_ready (coreAPI, GNUNET_NO,
832 GNUNET_TIME_absolute_get_remaining
833 (pending->timeout), &peer->id,
834 ntohs (pending->msg->size),
835 &core_transmit_notify, peer);
836 GNUNET_break (NULL != peer->th);
841 * To how many peers should we (on average) forward the request to
842 * obtain the desired target_replication count (on average).
844 * @param hop_count number of hops the message has traversed
845 * @param target_replication the number of total paths desired
846 * @return Some number of peers to forward the message to
849 get_forward_count (uint32_t hop_count, uint32_t target_replication)
851 uint32_t random_value;
852 uint32_t forward_count;
855 if (hop_count > GDS_NSE_get () * 4.0)
857 /* forcefully terminate */
858 GNUNET_STATISTICS_update (GDS_stats,
859 gettext_noop ("# requests TTL-dropped"),
863 if (hop_count > GDS_NSE_get () * 2.0)
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"),
1054 dist = get_distance (key, &pos->id.hashPubKey);
1055 if (dist < smallest_distance)
1058 smallest_distance = dist;
1066 GNUNET_STATISTICS_update (GDS_stats,
1067 gettext_noop ("# Peer selection failed"), 1,
1072 /* select "random" peer */
1073 /* count number of peers that are available and not filtered */
1075 for (bc = 0; bc <= closest_bucket; bc++)
1077 pos = k_buckets[bc].head;
1078 while ((pos != NULL) && (count < bucket_size))
1080 if ((bloom != NULL) &&
1082 GNUNET_CONTAINER_bloomfilter_test (bloom, &pos->id.hashPubKey)))
1084 GNUNET_STATISTICS_update (GDS_stats,
1086 ("# Peers excluded from routing due to Bloomfilter"),
1088 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1089 "Excluded peer `%s' due to BF match in random routing for %s\n",
1090 GNUNET_i2s (&pos->id), GNUNET_h2s (key));
1092 continue; /* Ignore bloomfiltered peers */
1098 if (0 == count) /* No peers to select from! */
1100 GNUNET_STATISTICS_update (GDS_stats,
1101 gettext_noop ("# Peer selection failed"), 1,
1105 /* Now actually choose a peer */
1106 selected = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, count);
1108 for (bc = 0; bc <= closest_bucket; bc++)
1110 for (pos = k_buckets[bc].head; ((pos != NULL) && (count < bucket_size)); pos = pos->next)
1112 if ((bloom != NULL) &&
1114 GNUNET_CONTAINER_bloomfilter_test (bloom, &pos->id.hashPubKey)))
1116 continue; /* Ignore bloomfiltered peers */
1118 if (0 == selected--)
1128 * Compute the set of peers that the given request should be
1131 * @param key routing key
1132 * @param bloom bloom filter excluding peers as targets, all selected
1133 * peers will be added to the bloom filter
1134 * @param hop_count number of hops the request has traversed so far
1135 * @param target_replication desired number of replicas
1136 * @param targets where to store an array of target peers (to be
1137 * free'd by the caller)
1138 * @return number of peers returned in 'targets'.
1141 get_target_peers (const struct GNUNET_HashCode *key,
1142 struct GNUNET_CONTAINER_BloomFilter *bloom,
1143 uint32_t hop_count, uint32_t target_replication,
1144 struct PeerInfo ***targets)
1148 struct PeerInfo **rtargets;
1149 struct PeerInfo *nxt;
1151 GNUNET_assert (NULL != bloom);
1152 ret = get_forward_count (hop_count, target_replication);
1158 rtargets = GNUNET_malloc (sizeof (struct PeerInfo *) * ret);
1159 for (off = 0; off < ret; off++)
1161 nxt = select_peer (key, bloom, hop_count);
1164 rtargets[off] = nxt;
1165 GNUNET_break (GNUNET_NO ==
1166 GNUNET_CONTAINER_bloomfilter_test (bloom,
1167 &nxt->id.hashPubKey));
1168 GNUNET_CONTAINER_bloomfilter_add (bloom, &rtargets[off]->id.hashPubKey);
1170 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1171 "Selected %u/%u peers at hop %u for %s (target was %u)\n", off,
1172 GNUNET_CONTAINER_multihashmap_size (all_known_peers),
1173 (unsigned int) hop_count, GNUNET_h2s (key), ret);
1176 GNUNET_free (rtargets);
1180 *targets = rtargets;
1181 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1182 "Forwarding query `%s' to %u peers (goal was %u peers)\n",
1191 * Perform a PUT operation. Forwards the given request to other
1192 * peers. Does not store the data locally. Does not give the
1193 * data to local clients. May do nothing if this is the only
1194 * peer in the network (or if we are the closest peer in the
1197 * @param type type of the block
1198 * @param options routing options
1199 * @param desired_replication_level desired replication count
1200 * @param expiration_time when does the content expire
1201 * @param hop_count how many hops has this message traversed so far
1202 * @param bf Bloom filter of peers this PUT has already traversed
1203 * @param key key for the content
1204 * @param put_path_length number of entries in put_path
1205 * @param put_path peers this request has traversed so far (if tracked)
1206 * @param data payload to store
1207 * @param data_size number of bytes in data
1210 GDS_NEIGHBOURS_handle_put (enum GNUNET_BLOCK_Type type,
1211 enum GNUNET_DHT_RouteOption options,
1212 uint32_t desired_replication_level,
1213 struct GNUNET_TIME_Absolute expiration_time,
1215 struct GNUNET_CONTAINER_BloomFilter *bf,
1216 const struct GNUNET_HashCode * key,
1217 unsigned int put_path_length,
1218 struct GNUNET_PeerIdentity *put_path,
1219 const void *data, size_t data_size)
1221 unsigned int target_count;
1223 struct PeerInfo **targets;
1224 struct PeerInfo *target;
1225 struct P2PPendingMessage *pending;
1227 struct PeerPutMessage *ppm;
1228 struct GNUNET_PeerIdentity *pp;
1230 GNUNET_assert (NULL != bf);
1231 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1232 "Adding myself (%s) to PUT bloomfilter for %s\n",
1233 GNUNET_i2s (&my_identity), GNUNET_h2s (key));
1234 GNUNET_CONTAINER_bloomfilter_add (bf, &my_identity.hashPubKey);
1235 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# PUT requests routed"),
1238 get_target_peers (key, bf, hop_count, desired_replication_level,
1240 if (0 == target_count)
1242 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1243 "Routing PUT for %s terminates after %u hops at %s\n",
1244 GNUNET_h2s (key), (unsigned int) hop_count,
1245 GNUNET_i2s (&my_identity));
1249 put_path_length * sizeof (struct GNUNET_PeerIdentity) + data_size +
1250 sizeof (struct PeerPutMessage);
1251 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1253 put_path_length = 0;
1254 msize = data_size + sizeof (struct PeerPutMessage);
1256 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1259 GNUNET_free (targets);
1262 GNUNET_STATISTICS_update (GDS_stats,
1264 ("# PUT messages queued for transmission"),
1265 target_count, GNUNET_NO);
1266 for (i = 0; i < target_count; i++)
1268 target = targets[i];
1269 if (target->pending_count >= MAXIMUM_PENDING_PER_PEER)
1271 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# P2P messages dropped due to full queue"),
1273 continue; /* skip */
1275 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1276 "Routing PUT for %s after %u hops to %s\n", GNUNET_h2s (key),
1277 (unsigned int) hop_count, GNUNET_i2s (&target->id));
1278 pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
1279 pending->importance = 0; /* FIXME */
1280 pending->timeout = expiration_time;
1281 ppm = (struct PeerPutMessage *) &pending[1];
1282 pending->msg = &ppm->header;
1283 ppm->header.size = htons (msize);
1284 ppm->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_P2P_PUT);
1285 ppm->options = htonl (options);
1286 ppm->type = htonl (type);
1287 ppm->hop_count = htonl (hop_count + 1);
1288 ppm->desired_replication_level = htonl (desired_replication_level);
1289 ppm->put_path_length = htonl (put_path_length);
1290 ppm->expiration_time = GNUNET_TIME_absolute_hton (expiration_time);
1291 GNUNET_break (GNUNET_YES ==
1292 GNUNET_CONTAINER_bloomfilter_test (bf,
1293 &target->id.hashPubKey));
1294 GNUNET_assert (GNUNET_OK ==
1295 GNUNET_CONTAINER_bloomfilter_get_raw_data (bf,
1299 pp = (struct GNUNET_PeerIdentity *) &ppm[1];
1300 memcpy (pp, put_path,
1301 sizeof (struct GNUNET_PeerIdentity) * put_path_length);
1302 memcpy (&pp[put_path_length], data, data_size);
1303 GNUNET_CONTAINER_DLL_insert_tail (target->head, target->tail, pending);
1304 target->pending_count++;
1305 process_peer_queue (target);
1307 GNUNET_free (targets);
1312 * Perform a GET operation. Forwards the given request to other
1313 * peers. Does not lookup the key locally. May do nothing if this is
1314 * the only peer in the network (or if we are the closest peer in the
1317 * @param type type of the block
1318 * @param options routing options
1319 * @param desired_replication_level desired replication count
1320 * @param hop_count how many hops did this request traverse so far?
1321 * @param key key for the content
1322 * @param xquery extended query
1323 * @param xquery_size number of bytes in xquery
1324 * @param reply_bf bloomfilter to filter duplicates
1325 * @param reply_bf_mutator mutator for reply_bf
1326 * @param peer_bf filter for peers not to select (again)
1329 GDS_NEIGHBOURS_handle_get (enum GNUNET_BLOCK_Type type,
1330 enum GNUNET_DHT_RouteOption options,
1331 uint32_t desired_replication_level,
1332 uint32_t hop_count, const struct GNUNET_HashCode * key,
1333 const void *xquery, size_t xquery_size,
1334 const struct GNUNET_CONTAINER_BloomFilter *reply_bf,
1335 uint32_t reply_bf_mutator,
1336 struct GNUNET_CONTAINER_BloomFilter *peer_bf)
1338 unsigned int target_count;
1340 struct PeerInfo **targets;
1341 struct PeerInfo *target;
1342 struct P2PPendingMessage *pending;
1344 struct PeerGetMessage *pgm;
1346 size_t reply_bf_size;
1348 GNUNET_assert (NULL != peer_bf);
1349 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# GET requests routed"),
1352 get_target_peers (key, peer_bf, hop_count, desired_replication_level,
1354 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1355 "Adding myself (%s) to GET bloomfilter for %s\n",
1356 GNUNET_i2s (&my_identity), GNUNET_h2s (key));
1357 GNUNET_CONTAINER_bloomfilter_add (peer_bf, &my_identity.hashPubKey);
1358 if (0 == target_count)
1360 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1361 "Routing GET for %s terminates after %u hops at %s\n",
1362 GNUNET_h2s (key), (unsigned int) hop_count,
1363 GNUNET_i2s (&my_identity));
1366 reply_bf_size = GNUNET_CONTAINER_bloomfilter_get_size (reply_bf);
1367 msize = xquery_size + sizeof (struct PeerGetMessage) + reply_bf_size;
1368 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1371 GNUNET_free (targets);
1374 GNUNET_STATISTICS_update (GDS_stats,
1376 ("# GET messages queued for transmission"),
1377 target_count, GNUNET_NO);
1378 /* forward request */
1379 for (i = 0; i < target_count; i++)
1381 target = targets[i];
1382 if (target->pending_count >= MAXIMUM_PENDING_PER_PEER)
1384 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# P2P messages dropped due to full queue"),
1386 continue; /* skip */
1388 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1389 "Routing GET for %s after %u hops to %s\n", GNUNET_h2s (key),
1390 (unsigned int) hop_count, GNUNET_i2s (&target->id));
1391 pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
1392 pending->importance = 0; /* FIXME */
1393 pending->timeout = GNUNET_TIME_relative_to_absolute (GET_TIMEOUT);
1394 pgm = (struct PeerGetMessage *) &pending[1];
1395 pending->msg = &pgm->header;
1396 pgm->header.size = htons (msize);
1397 pgm->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_P2P_GET);
1398 pgm->options = htonl (options);
1399 pgm->type = htonl (type);
1400 pgm->hop_count = htonl (hop_count + 1);
1401 pgm->desired_replication_level = htonl (desired_replication_level);
1402 pgm->xquery_size = htonl (xquery_size);
1403 pgm->bf_mutator = reply_bf_mutator;
1404 GNUNET_break (GNUNET_YES ==
1405 GNUNET_CONTAINER_bloomfilter_test (peer_bf,
1406 &target->id.hashPubKey));
1407 GNUNET_assert (GNUNET_OK ==
1408 GNUNET_CONTAINER_bloomfilter_get_raw_data (peer_bf,
1412 xq = (char *) &pgm[1];
1413 memcpy (xq, xquery, xquery_size);
1414 if (NULL != reply_bf)
1415 GNUNET_assert (GNUNET_OK ==
1416 GNUNET_CONTAINER_bloomfilter_get_raw_data (reply_bf,
1420 GNUNET_CONTAINER_DLL_insert_tail (target->head, target->tail, pending);
1421 target->pending_count++;
1422 process_peer_queue (target);
1424 GNUNET_free (targets);
1429 * Handle a reply (route to origin). Only forwards the reply back to
1430 * the given peer. Does not do local caching or forwarding to local
1433 * @param target neighbour that should receive the block (if still connected)
1434 * @param type type of the block
1435 * @param expiration_time when does the content expire
1436 * @param key key for the content
1437 * @param put_path_length number of entries in put_path
1438 * @param put_path peers the original PUT traversed (if tracked)
1439 * @param get_path_length number of entries in put_path
1440 * @param get_path peers this reply has traversed so far (if tracked)
1441 * @param data payload of the reply
1442 * @param data_size number of bytes in data
1445 GDS_NEIGHBOURS_handle_reply (const struct GNUNET_PeerIdentity *target,
1446 enum GNUNET_BLOCK_Type type,
1447 struct GNUNET_TIME_Absolute expiration_time,
1448 const struct GNUNET_HashCode * key,
1449 unsigned int put_path_length,
1450 const struct GNUNET_PeerIdentity *put_path,
1451 unsigned int get_path_length,
1452 const struct GNUNET_PeerIdentity *get_path,
1453 const void *data, size_t data_size)
1455 struct PeerInfo *pi;
1456 struct P2PPendingMessage *pending;
1458 struct PeerResultMessage *prm;
1459 struct GNUNET_PeerIdentity *paths;
1462 data_size + sizeof (struct PeerResultMessage) + (get_path_length +
1464 sizeof (struct GNUNET_PeerIdentity);
1465 if ((msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE) ||
1467 GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)) ||
1469 GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)) ||
1470 (data_size > GNUNET_SERVER_MAX_MESSAGE_SIZE))
1475 pi = GNUNET_CONTAINER_multihashmap_get (all_known_peers, &target->hashPubKey);
1478 /* peer disconnected in the meantime, drop reply */
1481 if (pi->pending_count >= MAXIMUM_PENDING_PER_PEER)
1484 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# P2P messages dropped due to full queue"),
1489 GNUNET_STATISTICS_update (GDS_stats,
1491 ("# RESULT messages queued for transmission"), 1,
1493 pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
1494 pending->importance = 0; /* FIXME */
1495 pending->timeout = expiration_time;
1496 prm = (struct PeerResultMessage *) &pending[1];
1497 pending->msg = &prm->header;
1498 prm->header.size = htons (msize);
1499 prm->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_P2P_RESULT);
1500 prm->type = htonl (type);
1501 prm->put_path_length = htonl (put_path_length);
1502 prm->get_path_length = htonl (get_path_length);
1503 prm->expiration_time = GNUNET_TIME_absolute_hton (expiration_time);
1505 paths = (struct GNUNET_PeerIdentity *) &prm[1];
1506 memcpy (paths, put_path,
1507 put_path_length * sizeof (struct GNUNET_PeerIdentity));
1508 memcpy (&paths[put_path_length], get_path,
1509 get_path_length * sizeof (struct GNUNET_PeerIdentity));
1510 memcpy (&paths[put_path_length + get_path_length], data, data_size);
1511 GNUNET_CONTAINER_DLL_insert (pi->head, pi->tail, pending);
1512 pi->pending_count++;
1513 process_peer_queue (pi);
1518 * To be called on core init/fail.
1520 * @param cls service closure
1521 * @param server handle to the server for this service
1522 * @param identity the public identity of this peer
1525 core_init (void *cls, struct GNUNET_CORE_Handle *server,
1526 const struct GNUNET_PeerIdentity *identity)
1528 GNUNET_assert (server != NULL);
1529 my_identity = *identity;
1534 * Core handler for p2p put requests.
1536 * @param cls closure
1537 * @param peer sender of the request
1538 * @param message message
1539 * @param peer peer identity this notification is about
1540 * @return GNUNET_OK to keep the connection open,
1541 * GNUNET_SYSERR to close it (signal serious error)
1544 handle_dht_p2p_put (void *cls, const struct GNUNET_PeerIdentity *peer,
1545 const struct GNUNET_MessageHeader *message)
1547 const struct PeerPutMessage *put;
1548 const struct GNUNET_PeerIdentity *put_path;
1549 const void *payload;
1552 size_t payload_size;
1553 enum GNUNET_DHT_RouteOption options;
1554 struct GNUNET_CONTAINER_BloomFilter *bf;
1555 struct GNUNET_HashCode test_key;
1557 msize = ntohs (message->size);
1558 if (msize < sizeof (struct PeerPutMessage))
1560 GNUNET_break_op (0);
1563 put = (const struct PeerPutMessage *) message;
1564 putlen = ntohl (put->put_path_length);
1566 sizeof (struct PeerPutMessage) +
1567 putlen * sizeof (struct GNUNET_PeerIdentity)) ||
1569 GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)))
1571 GNUNET_break_op (0);
1574 GNUNET_STATISTICS_update (GDS_stats,
1575 gettext_noop ("# P2P PUT requests received"), 1,
1577 GNUNET_STATISTICS_update (GDS_stats,
1578 gettext_noop ("# P2P PUT bytes received"), msize,
1580 put_path = (const struct GNUNET_PeerIdentity *) &put[1];
1581 payload = &put_path[putlen];
1582 options = ntohl (put->options);
1584 msize - (sizeof (struct PeerPutMessage) +
1585 putlen * sizeof (struct GNUNET_PeerIdentity));
1586 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "PUT for `%s' from %s\n",
1587 GNUNET_h2s (&put->key), GNUNET_i2s (peer));
1588 if (GNUNET_YES == log_route_details_stderr)
1592 tmp = GNUNET_strdup (GNUNET_i2s (&my_identity));
1593 LOG_TRAFFIC (GNUNET_ERROR_TYPE_DEBUG, "XDHT PUT %s: %s->%s (%u, %u=>%u)\n",
1594 GNUNET_h2s (&put->key), GNUNET_i2s (peer), tmp,
1595 ntohl(put->hop_count),
1596 GNUNET_CRYPTO_hash_matching_bits (&peer->hashPubKey, &put->key),
1597 GNUNET_CRYPTO_hash_matching_bits (&my_identity.hashPubKey, &put->key)
1601 switch (GNUNET_BLOCK_get_key
1602 (GDS_block_context, ntohl (put->type), payload, payload_size,
1606 if (0 != memcmp (&test_key, &put->key, sizeof (struct GNUNET_HashCode)))
1608 GNUNET_break_op (0);
1613 GNUNET_break_op (0);
1616 /* cannot verify, good luck */
1619 if (ntohl (put->type) == GNUNET_BLOCK_TYPE_REGEX) /* FIXME: do for all tpyes */
1621 switch (GNUNET_BLOCK_evaluate (GDS_block_context,
1624 NULL, 0, /* bloom filer */
1625 NULL, 0, /* xquery */
1626 payload, payload_size))
1628 case GNUNET_BLOCK_EVALUATION_OK_MORE:
1629 case GNUNET_BLOCK_EVALUATION_OK_LAST:
1632 case GNUNET_BLOCK_EVALUATION_OK_DUPLICATE:
1633 case GNUNET_BLOCK_EVALUATION_RESULT_INVALID:
1634 case GNUNET_BLOCK_EVALUATION_RESULT_IRRELEVANT:
1635 case GNUNET_BLOCK_EVALUATION_REQUEST_VALID:
1636 case GNUNET_BLOCK_EVALUATION_REQUEST_INVALID:
1637 case GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED:
1639 GNUNET_break_op (0);
1644 bf = GNUNET_CONTAINER_bloomfilter_init (put->bloomfilter, DHT_BLOOM_SIZE,
1645 GNUNET_CONSTANTS_BLOOMFILTER_K);
1646 GNUNET_break_op (GNUNET_YES ==
1647 GNUNET_CONTAINER_bloomfilter_test (bf, &peer->hashPubKey));
1649 struct GNUNET_PeerIdentity pp[putlen + 1];
1651 /* extend 'put path' by sender */
1652 if (0 != (options & GNUNET_DHT_RO_RECORD_ROUTE))
1654 memcpy (pp, put_path, putlen * sizeof (struct GNUNET_PeerIdentity));
1661 /* give to local clients */
1662 GDS_CLIENTS_handle_reply (GNUNET_TIME_absolute_ntoh (put->expiration_time),
1663 &put->key, 0, NULL, putlen, pp, ntohl (put->type),
1664 payload_size, payload);
1666 if ((0 != (options & GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE)) ||
1667 (am_closest_peer (&put->key, bf)))
1668 GDS_DATACACHE_handle_put (GNUNET_TIME_absolute_ntoh
1669 (put->expiration_time), &put->key, putlen, pp,
1670 ntohl (put->type), payload_size, payload);
1671 /* route to other peers */
1672 GDS_NEIGHBOURS_handle_put (ntohl (put->type), options,
1673 ntohl (put->desired_replication_level),
1674 GNUNET_TIME_absolute_ntoh (put->expiration_time),
1675 ntohl (put->hop_count), bf, &put->key, putlen,
1676 pp, payload, payload_size);
1677 /* notify monitoring clients */
1678 GDS_CLIENTS_process_put (options,
1680 ntohl (put->hop_count),
1681 ntohl (put->desired_replication_level),
1683 GNUNET_TIME_absolute_ntoh (put->expiration_time),
1688 GNUNET_CONTAINER_bloomfilter_free (bf);
1694 * We have received a FIND PEER request. Send matching
1697 * @param sender sender of the FIND PEER request
1698 * @param key peers close to this key are desired
1699 * @param bf peers matching this bf are excluded
1700 * @param bf_mutator mutator for bf
1703 handle_find_peer (const struct GNUNET_PeerIdentity *sender,
1704 const struct GNUNET_HashCode * key,
1705 struct GNUNET_CONTAINER_BloomFilter *bf, uint32_t bf_mutator)
1708 struct PeerBucket *bucket;
1709 struct PeerInfo *peer;
1710 unsigned int choice;
1711 struct GNUNET_HashCode mhash;
1712 const struct GNUNET_HELLO_Message *hello;
1714 /* first, check about our own HELLO */
1715 if (NULL != GDS_my_hello)
1717 GNUNET_BLOCK_mingle_hash (&my_identity.hashPubKey, bf_mutator, &mhash);
1719 (GNUNET_YES != GNUNET_CONTAINER_bloomfilter_test (bf, &mhash)))
1721 GDS_NEIGHBOURS_handle_reply (sender, GNUNET_BLOCK_TYPE_DHT_HELLO,
1722 GNUNET_TIME_relative_to_absolute
1724 key, 0, NULL, 0, NULL, GDS_my_hello,
1725 GNUNET_HELLO_size ((const struct
1726 GNUNET_HELLO_Message *)
1731 GNUNET_STATISTICS_update (GDS_stats,
1733 ("# FIND PEER requests ignored due to Bloomfilter"),
1739 GNUNET_STATISTICS_update (GDS_stats,
1741 ("# FIND PEER requests ignored due to lack of HELLO"),
1745 /* then, also consider sending a random HELLO from the closest bucket */
1746 if (0 == memcmp (&my_identity.hashPubKey, key, sizeof (struct GNUNET_HashCode)))
1747 bucket_idx = closest_bucket;
1749 bucket_idx = GNUNET_MIN (closest_bucket, find_bucket (key));
1750 if (bucket_idx == GNUNET_SYSERR)
1752 bucket = &k_buckets[bucket_idx];
1753 if (bucket->peers_size == 0)
1756 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, bucket->peers_size);
1757 peer = bucket->head;
1760 GNUNET_assert (peer != NULL);
1764 choice = bucket->peers_size;
1769 return; /* no non-masked peer available */
1771 peer = bucket->head;
1772 GNUNET_BLOCK_mingle_hash (&peer->id.hashPubKey, bf_mutator, &mhash);
1773 hello = GDS_HELLO_get (&peer->id);
1775 while ((hello == NULL) ||
1776 (GNUNET_YES == GNUNET_CONTAINER_bloomfilter_test (bf, &mhash)));
1777 GDS_NEIGHBOURS_handle_reply (sender, GNUNET_BLOCK_TYPE_DHT_HELLO,
1778 GNUNET_TIME_relative_to_absolute
1779 (GNUNET_CONSTANTS_HELLO_ADDRESS_EXPIRATION), key,
1780 0, NULL, 0, NULL, hello,
1781 GNUNET_HELLO_size (hello));
1786 * Core handler for p2p get requests.
1788 * @param cls closure
1789 * @param peer sender of the request
1790 * @param message message
1791 * @return GNUNET_OK to keep the connection open,
1792 * GNUNET_SYSERR to close it (signal serious error)
1795 handle_dht_p2p_get (void *cls, const struct GNUNET_PeerIdentity *peer,
1796 const struct GNUNET_MessageHeader *message)
1798 struct PeerGetMessage *get;
1799 uint32_t xquery_size;
1800 size_t reply_bf_size;
1802 enum GNUNET_BLOCK_Type type;
1803 enum GNUNET_DHT_RouteOption options;
1804 enum GNUNET_BLOCK_EvaluationResult eval;
1805 struct GNUNET_CONTAINER_BloomFilter *reply_bf;
1806 struct GNUNET_CONTAINER_BloomFilter *peer_bf;
1810 memcmp (peer, &my_identity,
1811 sizeof (struct GNUNET_PeerIdentity)));
1812 /* parse and validate message */
1813 msize = ntohs (message->size);
1814 if (msize < sizeof (struct PeerGetMessage))
1816 GNUNET_break_op (0);
1819 get = (struct PeerGetMessage *) message;
1820 xquery_size = ntohl (get->xquery_size);
1821 if (msize < sizeof (struct PeerGetMessage) + xquery_size)
1823 GNUNET_break_op (0);
1826 reply_bf_size = msize - (sizeof (struct PeerGetMessage) + xquery_size);
1827 type = ntohl (get->type);
1828 options = ntohl (get->options);
1829 xquery = (const char *) &get[1];
1831 GNUNET_STATISTICS_update (GDS_stats,
1832 gettext_noop ("# P2P GET requests received"), 1,
1834 GNUNET_STATISTICS_update (GDS_stats,
1835 gettext_noop ("# P2P GET bytes received"), msize,
1837 if (GNUNET_YES == log_route_details_stderr)
1841 tmp = GNUNET_strdup (GNUNET_i2s (&my_identity));
1842 LOG_TRAFFIC (GNUNET_ERROR_TYPE_DEBUG,
1843 "XDHT GET %s: %s->%s (%u, %u=>%u) xq: %.*s\n",
1844 GNUNET_h2s (&get->key), GNUNET_i2s (peer), tmp,
1845 ntohl(get->hop_count),
1846 GNUNET_CRYPTO_hash_matching_bits (&peer->hashPubKey, &get->key),
1847 GNUNET_CRYPTO_hash_matching_bits (&my_identity.hashPubKey, &get->key),
1848 ntohl(get->xquery_size), xquery
1853 if (reply_bf_size > 0)
1855 GNUNET_CONTAINER_bloomfilter_init (&xquery[xquery_size], reply_bf_size,
1856 GNUNET_CONSTANTS_BLOOMFILTER_K);
1858 GNUNET_BLOCK_evaluate (GDS_block_context, type, &get->key, &reply_bf,
1859 get->bf_mutator, xquery, xquery_size, NULL, 0);
1860 if (eval != GNUNET_BLOCK_EVALUATION_REQUEST_VALID)
1862 /* request invalid or block type not supported */
1863 GNUNET_break_op (eval == GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED);
1864 if (NULL != reply_bf)
1865 GNUNET_CONTAINER_bloomfilter_free (reply_bf);
1869 GNUNET_CONTAINER_bloomfilter_init (get->bloomfilter, DHT_BLOOM_SIZE,
1870 GNUNET_CONSTANTS_BLOOMFILTER_K);
1871 GNUNET_break_op (GNUNET_YES ==
1872 GNUNET_CONTAINER_bloomfilter_test (peer_bf,
1873 &peer->hashPubKey));
1874 /* remember request for routing replies */
1875 GDS_ROUTING_add (peer, type, options, &get->key, xquery, xquery_size,
1876 reply_bf, get->bf_mutator);
1877 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "GET for %s at %s after %u hops\n",
1878 GNUNET_h2s (&get->key), GNUNET_i2s (&my_identity),
1879 (unsigned int) ntohl (get->hop_count));
1880 /* local lookup (this may update the reply_bf) */
1881 if ((0 != (options & GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE)) ||
1882 (am_closest_peer (&get->key, peer_bf)))
1884 if ((0 != (options & GNUNET_DHT_RO_FIND_PEER)))
1886 GNUNET_STATISTICS_update (GDS_stats,
1888 ("# P2P FIND PEER requests processed"), 1,
1890 handle_find_peer (peer, &get->key, reply_bf, get->bf_mutator);
1895 GDS_DATACACHE_handle_get (&get->key, type, xquery, xquery_size,
1896 &reply_bf, get->bf_mutator);
1901 GNUNET_STATISTICS_update (GDS_stats,
1902 gettext_noop ("# P2P GET requests ONLY routed"),
1906 GDS_CLIENTS_process_get (options,
1908 ntohl(get->hop_count),
1909 ntohl(get->desired_replication_level),
1913 /* P2P forwarding */
1914 if (eval != GNUNET_BLOCK_EVALUATION_OK_LAST)
1915 GDS_NEIGHBOURS_handle_get (type, options,
1916 ntohl (get->desired_replication_level),
1917 ntohl (get->hop_count), &get->key, xquery,
1918 xquery_size, reply_bf, get->bf_mutator, peer_bf);
1920 if (NULL != reply_bf)
1921 GNUNET_CONTAINER_bloomfilter_free (reply_bf);
1922 GNUNET_CONTAINER_bloomfilter_free (peer_bf);
1928 * Core handler for p2p result messages.
1930 * @param cls closure
1931 * @param message message
1932 * @param peer peer identity this notification is about
1933 * @return GNUNET_YES (do not cut p2p connection)
1936 handle_dht_p2p_result (void *cls, const struct GNUNET_PeerIdentity *peer,
1937 const struct GNUNET_MessageHeader *message)
1939 const struct PeerResultMessage *prm;
1940 const struct GNUNET_PeerIdentity *put_path;
1941 const struct GNUNET_PeerIdentity *get_path;
1943 uint32_t get_path_length;
1944 uint32_t put_path_length;
1947 enum GNUNET_BLOCK_Type type;
1949 /* parse and validate message */
1950 msize = ntohs (message->size);
1951 if (msize < sizeof (struct PeerResultMessage))
1953 GNUNET_break_op (0);
1956 prm = (struct PeerResultMessage *) message;
1957 put_path_length = ntohl (prm->put_path_length);
1958 get_path_length = ntohl (prm->get_path_length);
1960 sizeof (struct PeerResultMessage) + (get_path_length +
1962 sizeof (struct GNUNET_PeerIdentity)) ||
1964 GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)) ||
1966 GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)))
1968 GNUNET_break_op (0);
1971 put_path = (const struct GNUNET_PeerIdentity *) &prm[1];
1972 get_path = &put_path[put_path_length];
1973 type = ntohl (prm->type);
1974 data = (const void *) &get_path[get_path_length];
1976 msize - (sizeof (struct PeerResultMessage) +
1978 put_path_length) * sizeof (struct GNUNET_PeerIdentity));
1979 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# P2P RESULTS received"),
1981 GNUNET_STATISTICS_update (GDS_stats,
1982 gettext_noop ("# P2P RESULT bytes received"),
1984 if (GNUNET_YES == log_route_details_stderr)
1988 tmp = GNUNET_strdup (GNUNET_i2s (&my_identity));
1989 LOG_TRAFFIC (GNUNET_ERROR_TYPE_DEBUG, "XDHT RESULT %s: %s->%s (%u)\n",
1990 GNUNET_h2s (&prm->key), GNUNET_i2s (peer), tmp,
1991 get_path_length + 1);
1994 /* if we got a HELLO, consider it for our own routing table */
1995 if (type == GNUNET_BLOCK_TYPE_DHT_HELLO)
1997 const struct GNUNET_MessageHeader *h;
1998 struct GNUNET_PeerIdentity pid;
2001 /* Should be a HELLO, validate and consider using it! */
2002 if (data_size < sizeof (struct GNUNET_MessageHeader))
2004 GNUNET_break_op (0);
2008 if (data_size != ntohs (h->size))
2010 GNUNET_break_op (0);
2014 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) h, &pid))
2016 GNUNET_break_op (0);
2019 if ((GNUNET_YES != disable_try_connect) &&
2020 0 != memcmp (&my_identity, &pid, sizeof (struct GNUNET_PeerIdentity)))
2022 bucket = find_bucket (&pid.hashPubKey);
2023 if ((bucket >= 0) &&
2024 (k_buckets[bucket].peers_size < bucket_size) &&
2025 (NULL != GDS_transport_handle))
2027 GNUNET_TRANSPORT_offer_hello (GDS_transport_handle, h, NULL, NULL);
2028 GNUNET_TRANSPORT_try_connect (GDS_transport_handle, &pid, NULL, NULL); /*FIXME TRY_CONNECT change */
2033 /* append 'peer' to 'get_path' */
2035 struct GNUNET_PeerIdentity xget_path[get_path_length + 1];
2037 memcpy (xget_path, get_path,
2038 get_path_length * sizeof (struct GNUNET_PeerIdentity));
2039 xget_path[get_path_length] = *peer;
2042 /* forward to local clients */
2043 GDS_CLIENTS_handle_reply (GNUNET_TIME_absolute_ntoh (prm->expiration_time),
2044 &prm->key, get_path_length, xget_path,
2045 put_path_length, put_path, type, data_size, data);
2046 GDS_CLIENTS_process_get_resp (type,
2047 xget_path, get_path_length,
2048 put_path, put_path_length,
2049 GNUNET_TIME_absolute_ntoh (
2050 prm->expiration_time),
2055 /* forward to other peers */
2056 GDS_ROUTING_process (type, GNUNET_TIME_absolute_ntoh (prm->expiration_time),
2057 &prm->key, put_path_length, put_path, get_path_length,
2058 xget_path, data, data_size);
2066 * Initialize neighbours subsystem.
2068 * @return GNUNET_OK on success, GNUNET_SYSERR on error
2071 GDS_NEIGHBOURS_init ()
2073 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
2074 {&handle_dht_p2p_get, GNUNET_MESSAGE_TYPE_DHT_P2P_GET, 0},
2075 {&handle_dht_p2p_put, GNUNET_MESSAGE_TYPE_DHT_P2P_PUT, 0},
2076 {&handle_dht_p2p_result, GNUNET_MESSAGE_TYPE_DHT_P2P_RESULT, 0},
2079 unsigned long long temp_config_num;
2082 = GNUNET_CONFIGURATION_get_value_yesno (GDS_cfg, "DHT", "DISABLE_TRY_CONNECT");
2084 GNUNET_CONFIGURATION_get_value_number (GDS_cfg, "DHT", "bucket_size",
2086 bucket_size = (unsigned int) temp_config_num;
2087 log_route_details_stderr =
2088 (NULL != getenv("GNUNET_DHT_ROUTE_DEBUG")) ? GNUNET_YES : GNUNET_NO;
2089 atsAPI = GNUNET_ATS_performance_init (GDS_cfg, NULL, NULL);
2091 GNUNET_CORE_connect (GDS_cfg, NULL, &core_init, &handle_core_connect,
2092 &handle_core_disconnect, NULL, GNUNET_NO, NULL,
2093 GNUNET_NO, core_handlers);
2094 if (coreAPI == NULL)
2095 return GNUNET_SYSERR;
2096 all_known_peers = GNUNET_CONTAINER_multihashmap_create (256, GNUNET_NO);
2102 * Shutdown neighbours subsystem.
2105 GDS_NEIGHBOURS_done ()
2107 if (coreAPI == NULL)
2109 GNUNET_CORE_disconnect (coreAPI);
2111 GNUNET_ATS_performance_done (atsAPI);
2113 GNUNET_assert (0 == GNUNET_CONTAINER_multihashmap_size (all_known_peers));
2114 GNUNET_CONTAINER_multihashmap_destroy (all_known_peers);
2115 all_known_peers = NULL;
2116 if (GNUNET_SCHEDULER_NO_TASK != find_peer_task)
2118 GNUNET_SCHEDULER_cancel (find_peer_task);
2119 find_peer_task = GNUNET_SCHEDULER_NO_TASK;
2124 * Get the ID of the local node.
2126 * @return identity of the local node
2128 struct GNUNET_PeerIdentity *
2129 GDS_NEIGHBOURS_get_id ()
2131 return &my_identity;
2135 /* end of gnunet-service-dht_neighbours.c */