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"
52 #include "../regex/regex_block_lib.h"
55 #define LOG_TRAFFIC(kind,...) GNUNET_log_from (kind, "dht-traffic",__VA_ARGS__)
58 * How many buckets will we allow total.
60 #define MAX_BUCKETS sizeof (struct GNUNET_HashCode) * 8
63 * What is the maximum number of peers in a given bucket.
65 #define DEFAULT_BUCKET_SIZE 8
68 * Desired replication level for FIND PEER requests
70 #define FIND_PEER_REPLICATION_LEVEL 4
73 * Maximum allowed replication level for all requests.
75 #define MAXIMUM_REPLICATION_LEVEL 16
78 * Maximum allowed number of pending messages per peer.
80 #define MAXIMUM_PENDING_PER_PEER 64
83 * How often to update our preference levels for peers in our routing tables.
85 #define DHT_DEFAULT_PREFERENCE_INTERVAL GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MINUTES, 2)
88 * How long at least to wait before sending another find peer request.
90 #define DHT_MINIMUM_FIND_PEER_INTERVAL GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 30)
93 * How long at most to wait before sending another find peer request.
95 #define DHT_MAXIMUM_FIND_PEER_INTERVAL GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MINUTES, 10)
98 * How long at most to wait for transmission of a GET request to another peer?
100 #define GET_TIMEOUT GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MINUTES, 2)
103 * Hello address expiration
105 extern struct GNUNET_TIME_Relative hello_expiration;
108 GNUNET_NETWORK_STRUCT_BEGIN
113 struct PeerPutMessage
116 * Type: GNUNET_MESSAGE_TYPE_DHT_P2P_PUT
118 struct GNUNET_MessageHeader header;
123 uint32_t options GNUNET_PACKED;
128 uint32_t type GNUNET_PACKED;
133 uint32_t hop_count GNUNET_PACKED;
136 * Replication level for this message
138 uint32_t desired_replication_level GNUNET_PACKED;
141 * Length of the PUT path that follows (if tracked).
143 uint32_t put_path_length GNUNET_PACKED;
146 * When does the content expire?
148 struct GNUNET_TIME_AbsoluteNBO expiration_time;
151 * Bloomfilter (for peer identities) to stop circular routes
153 char bloomfilter[DHT_BLOOM_SIZE];
156 * The key we are storing under.
158 struct GNUNET_HashCode key;
160 /* put path (if tracked) */
170 struct PeerResultMessage
173 * Type: GNUNET_MESSAGE_TYPE_DHT_P2P_RESULT
175 struct GNUNET_MessageHeader header;
180 uint32_t type GNUNET_PACKED;
183 * Length of the PUT path that follows (if tracked).
185 uint32_t put_path_length GNUNET_PACKED;
188 * Length of the GET path that follows (if tracked).
190 uint32_t get_path_length GNUNET_PACKED;
193 * When does the content expire?
195 struct GNUNET_TIME_AbsoluteNBO expiration_time;
198 * The key of the corresponding GET request.
200 struct GNUNET_HashCode key;
202 /* put path (if tracked) */
204 /* get path (if tracked) */
214 struct PeerGetMessage
217 * Type: GNUNET_MESSAGE_TYPE_DHT_P2P_GET
219 struct GNUNET_MessageHeader header;
224 uint32_t options GNUNET_PACKED;
227 * Desired content type.
229 uint32_t type GNUNET_PACKED;
234 uint32_t hop_count GNUNET_PACKED;
237 * Desired replication level for this request.
239 uint32_t desired_replication_level GNUNET_PACKED;
242 * Size of the extended query.
244 uint32_t xquery_size;
247 * Bloomfilter mutator.
252 * Bloomfilter (for peer identities) to stop circular routes
254 char bloomfilter[DHT_BLOOM_SIZE];
257 * The key we are looking for.
259 struct GNUNET_HashCode key;
263 /* result bloomfilter */
266 GNUNET_NETWORK_STRUCT_END
269 * Linked list of messages to send to a particular other peer.
271 struct P2PPendingMessage
274 * Pointer to next item in the list
276 struct P2PPendingMessage *next;
279 * Pointer to previous item in the list
281 struct P2PPendingMessage *prev;
284 * Message importance level. FIXME: used? useful?
286 unsigned int importance;
289 * When does this message time out?
291 struct GNUNET_TIME_Absolute timeout;
294 * Actual message to be sent, allocated at the end of the struct:
295 * // msg = (cast) &pm[1];
296 * // memcpy (&pm[1], data, len);
298 const struct GNUNET_MessageHeader *msg;
304 * Entry for a peer in a bucket.
309 * Next peer entry (DLL)
311 struct PeerInfo *next;
314 * Prev peer entry (DLL)
316 struct PeerInfo *prev;
319 * Count of outstanding messages for peer.
321 unsigned int pending_count;
324 * Head of pending messages to be sent to this peer.
326 struct P2PPendingMessage *head;
329 * Tail of pending messages to be sent to this peer.
331 struct P2PPendingMessage *tail;
334 * Core handle for sending messages to this peer.
336 struct GNUNET_CORE_TransmitHandle *th;
339 * Task for scheduling preference updates
341 GNUNET_SCHEDULER_TaskIdentifier preference_task;
344 * What is the identity of the peer?
346 struct GNUNET_PeerIdentity id;
350 * What is the average latency for replies received?
352 struct GNUNET_TIME_Relative latency;
355 * Transport level distance to peer.
357 unsigned int distance;
364 * Peers are grouped into buckets.
371 struct PeerInfo *head;
376 struct PeerInfo *tail;
379 * Number of peers in the bucket.
381 unsigned int peers_size;
385 * Should routing details be logged to stderr (for debugging)?
387 static int log_route_details_stderr;
390 * The lowest currently used bucket, initially 0 (for 0-bits matching bucket).
392 static unsigned int closest_bucket;
395 * How many peers have we added since we sent out our last
398 static unsigned int newly_found_peers;
401 * Option for testing that disables the 'connect' function of the DHT.
403 static int disable_try_connect;
406 * The buckets. Array of size MAX_BUCKET_SIZE. Offset 0 means 0 bits matching.
408 static struct PeerBucket k_buckets[MAX_BUCKETS];
411 * Hash map of all known peers, for easy removal from k_buckets on disconnect.
413 static struct GNUNET_CONTAINER_MultiHashMap *all_known_peers;
416 * Maximum size for each bucket.
418 static unsigned int bucket_size = DEFAULT_BUCKET_SIZE;
421 * Task that sends FIND PEER requests.
423 static GNUNET_SCHEDULER_TaskIdentifier find_peer_task;
426 * Identity of this peer.
428 static struct GNUNET_PeerIdentity my_identity;
433 static struct GNUNET_CORE_Handle *coreAPI;
438 static struct GNUNET_ATS_PerformanceHandle *atsAPI;
443 * Find the optimal bucket for this key.
445 * @param hc the hashcode to compare our identity to
446 * @return the proper bucket index, or GNUNET_SYSERR
447 * on error (same hashcode)
450 find_bucket (const struct GNUNET_HashCode * hc)
454 bits = GNUNET_CRYPTO_hash_matching_bits (&my_identity.hashPubKey, hc);
455 if (bits == MAX_BUCKETS)
457 /* How can all bits match? Got my own ID? */
459 return GNUNET_SYSERR;
461 return MAX_BUCKETS - bits - 1;
466 * Let GNUnet core know that we like the given peer.
468 * @param cls the 'struct PeerInfo' of the peer
469 * @param tc scheduler context.
472 update_core_preference (void *cls,
473 const struct GNUNET_SCHEDULER_TaskContext *tc)
475 struct PeerInfo *peer = cls;
477 unsigned int matching;
480 peer->preference_task = GNUNET_SCHEDULER_NO_TASK;
481 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
484 GNUNET_CRYPTO_hash_matching_bits (&my_identity.hashPubKey,
485 &peer->id.hashPubKey);
488 bucket = find_bucket (&peer->id.hashPubKey);
489 if (bucket == GNUNET_SYSERR)
493 GNUNET_assert (k_buckets[bucket].peers_size != 0);
494 preference = (1LL << matching) / k_buckets[bucket].peers_size;
498 peer->preference_task =
499 GNUNET_SCHEDULER_add_delayed (DHT_DEFAULT_PREFERENCE_INTERVAL,
500 &update_core_preference, peer);
503 GNUNET_STATISTICS_update (GDS_stats,
504 gettext_noop ("# Preference updates given to core"),
506 GNUNET_ATS_change_preference (atsAPI, &peer->id,
507 GNUNET_ATS_PREFERENCE_BANDWIDTH,
508 (double) preference, GNUNET_ATS_PREFERENCE_END);
509 peer->preference_task =
510 GNUNET_SCHEDULER_add_delayed (DHT_DEFAULT_PREFERENCE_INTERVAL,
511 &update_core_preference, peer);
518 * Closure for 'add_known_to_bloom'.
520 struct BloomConstructorContext
523 * Bloom filter under construction.
525 struct GNUNET_CONTAINER_BloomFilter *bloom;
535 * Add each of the peers we already know to the bloom filter of
536 * the request so that we don't get duplicate HELLOs.
538 * @param cls the 'struct BloomConstructorContext'.
539 * @param key peer identity to add to the bloom filter
540 * @param value value the peer information (unused)
541 * @return GNUNET_YES (we should continue to iterate)
544 add_known_to_bloom (void *cls, const struct GNUNET_HashCode * key, void *value)
546 struct BloomConstructorContext *ctx = cls;
547 struct GNUNET_HashCode mh;
549 GNUNET_BLOCK_mingle_hash (key, ctx->bf_mutator, &mh);
550 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
551 "Adding known peer (%s) to bloomfilter for FIND PEER with mutation %u\n",
552 GNUNET_h2s (key), ctx->bf_mutator);
553 GNUNET_CONTAINER_bloomfilter_add (ctx->bloom, &mh);
559 * Task to send a find peer message for our own peer identifier
560 * so that we can find the closest peers in the network to ourselves
561 * and attempt to connect to them.
563 * @param cls closure for this task
564 * @param tc the context under which the task is running
567 send_find_peer_message (void *cls,
568 const struct GNUNET_SCHEDULER_TaskContext *tc)
570 struct GNUNET_TIME_Relative next_send_time;
571 struct BloomConstructorContext bcc;
572 struct GNUNET_CONTAINER_BloomFilter *peer_bf;
574 find_peer_task = GNUNET_SCHEDULER_NO_TASK;
575 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
577 if (newly_found_peers > bucket_size)
579 /* If we are finding many peers already, no need to send out our request right now! */
581 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
582 &send_find_peer_message, NULL);
583 newly_found_peers = 0;
587 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, UINT32_MAX);
589 GNUNET_CONTAINER_bloomfilter_init (NULL, DHT_BLOOM_SIZE,
590 GNUNET_CONSTANTS_BLOOMFILTER_K);
591 GNUNET_CONTAINER_multihashmap_iterate (all_known_peers, &add_known_to_bloom,
593 GNUNET_STATISTICS_update (GDS_stats,
594 gettext_noop ("# FIND PEER messages initiated"), 1,
597 GNUNET_CONTAINER_bloomfilter_init (NULL, DHT_BLOOM_SIZE,
598 GNUNET_CONSTANTS_BLOOMFILTER_K);
599 // FIXME: pass priority!?
600 GDS_NEIGHBOURS_handle_get (GNUNET_BLOCK_TYPE_DHT_HELLO,
601 GNUNET_DHT_RO_FIND_PEER,
602 FIND_PEER_REPLICATION_LEVEL, 0,
603 &my_identity.hashPubKey, NULL, 0, bcc.bloom,
604 bcc.bf_mutator, peer_bf);
605 GNUNET_CONTAINER_bloomfilter_free (peer_bf);
606 GNUNET_CONTAINER_bloomfilter_free (bcc.bloom);
607 /* schedule next round */
608 next_send_time.rel_value =
609 DHT_MINIMUM_FIND_PEER_INTERVAL.rel_value +
610 GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK,
611 DHT_MAXIMUM_FIND_PEER_INTERVAL.rel_value /
612 (newly_found_peers + 1));
613 newly_found_peers = 0;
615 GNUNET_SCHEDULER_add_delayed (next_send_time, &send_find_peer_message,
621 * Method called whenever a peer connects.
624 * @param peer peer identity this notification is about
627 handle_core_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
629 struct PeerInfo *ret;
632 /* Check for connect to self message */
633 if (0 == memcmp (&my_identity, peer, sizeof (struct GNUNET_PeerIdentity)))
635 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connected %s to %s\n",
636 GNUNET_i2s (&my_identity), GNUNET_h2s (&peer->hashPubKey));
638 GNUNET_CONTAINER_multihashmap_contains (all_known_peers,
644 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# peers connected"), 1,
646 peer_bucket = find_bucket (&peer->hashPubKey);
647 GNUNET_assert ((peer_bucket >= 0) && (peer_bucket < MAX_BUCKETS));
648 ret = GNUNET_malloc (sizeof (struct PeerInfo));
650 ret->latency = latency;
651 ret->distance = distance;
654 GNUNET_CONTAINER_DLL_insert_tail (k_buckets[peer_bucket].head,
655 k_buckets[peer_bucket].tail, ret);
656 k_buckets[peer_bucket].peers_size++;
657 closest_bucket = GNUNET_MAX (closest_bucket, peer_bucket);
658 if ((peer_bucket > 0) && (k_buckets[peer_bucket].peers_size <= bucket_size))
660 ret->preference_task =
661 GNUNET_SCHEDULER_add_now (&update_core_preference, ret);
664 GNUNET_assert (GNUNET_OK ==
665 GNUNET_CONTAINER_multihashmap_put (all_known_peers,
666 &peer->hashPubKey, ret,
667 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
668 if (1 == GNUNET_CONTAINER_multihashmap_size (all_known_peers) &&
669 (GNUNET_YES != disable_try_connect))
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_NO,
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_NO,
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_NO,
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 () * 4.0)
860 /* forcefully terminate */
861 GNUNET_STATISTICS_update (GDS_stats,
862 gettext_noop ("# requests TTL-dropped"),
866 if (hop_count > GDS_NSE_get () * 2.0)
868 /* Once we have reached our ideal number of hops, only forward to 1 peer */
871 /* bound by system-wide maximum */
873 GNUNET_MIN (MAXIMUM_REPLICATION_LEVEL, target_replication);
875 1 + (target_replication - 1.0) / (GDS_NSE_get () +
876 ((float) (target_replication - 1.0) *
878 /* Set forward count to floor of target_value */
879 forward_count = (uint32_t) target_value;
880 /* Subtract forward_count (floor) from target_value (yields value between 0 and 1) */
881 target_value = target_value - forward_count;
883 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, UINT32_MAX);
884 if (random_value < (target_value * UINT32_MAX))
886 return forward_count;
891 * Compute the distance between have and target as a 32-bit value.
892 * Differences in the lower bits must count stronger than differences
893 * in the higher bits.
895 * @return 0 if have==target, otherwise a number
896 * that is larger as the distance between
897 * the two hash codes increases
900 get_distance (const struct GNUNET_HashCode * target, const struct GNUNET_HashCode * have)
907 /* We have to represent the distance between two 2^9 (=512)-bit
908 * numbers as a 2^5 (=32)-bit number with "0" being used for the
909 * two numbers being identical; furthermore, we need to
910 * guarantee that a difference in the number of matching
911 * bits is always represented in the result.
913 * We use 2^32/2^9 numerical values to distinguish between
914 * hash codes that have the same LSB bit distance and
915 * use the highest 2^9 bits of the result to signify the
916 * number of (mis)matching LSB bits; if we have 0 matching
917 * and hence 512 mismatching LSB bits we return -1 (since
918 * 512 itself cannot be represented with 9 bits) */
920 /* first, calculate the most significant 9 bits of our
921 * result, aka the number of LSBs */
922 bucket = GNUNET_CRYPTO_hash_matching_bits (target, have);
923 /* bucket is now a value between 0 and 512 */
925 return 0; /* perfect match */
927 return (unsigned int) -1; /* LSB differs; use max (if we did the bit-shifting
928 * below, we'd end up with max+1 (overflow)) */
930 /* calculate the most significant bits of the final result */
931 msb = (512 - bucket) << (32 - 9);
932 /* calculate the 32-9 least significant bits of the final result by
933 * looking at the differences in the 32-9 bits following the
934 * mismatching bit at 'bucket' */
937 (i < sizeof (struct GNUNET_HashCode) * 8) && (i < bucket + 1 + 32 - 9); i++)
939 if (GNUNET_CRYPTO_hash_get_bit (target, i) !=
940 GNUNET_CRYPTO_hash_get_bit (have, i))
941 lsb |= (1 << (bucket + 32 - 9 - i)); /* first bit set will be 10,
942 * last bit set will be 31 -- if
943 * i does not reach 512 first... */
950 * Check whether my identity is closer than any known peers. If a
951 * non-null bloomfilter is given, check if this is the closest peer
952 * that hasn't already been routed to.
954 * @param key hash code to check closeness to
955 * @param bloom bloomfilter, exclude these entries from the decision
956 * @return GNUNET_YES if node location is closest,
957 * GNUNET_NO otherwise.
960 am_closest_peer (const struct GNUNET_HashCode * key,
961 const struct GNUNET_CONTAINER_BloomFilter *bloom)
967 struct PeerInfo *pos;
969 if (0 == memcmp (&my_identity.hashPubKey, key, sizeof (struct GNUNET_HashCode)))
971 bucket_num = find_bucket (key);
972 GNUNET_assert (bucket_num >= 0);
973 bits = GNUNET_CRYPTO_hash_matching_bits (&my_identity.hashPubKey, key);
974 pos = k_buckets[bucket_num].head;
976 while ((pos != NULL) && (count < bucket_size))
978 if ((bloom != NULL) &&
980 GNUNET_CONTAINER_bloomfilter_test (bloom, &pos->id.hashPubKey)))
983 continue; /* Skip already checked entries */
985 other_bits = GNUNET_CRYPTO_hash_matching_bits (&pos->id.hashPubKey, key);
986 if (other_bits > bits)
988 if (other_bits == bits) /* We match the same number of bits */
992 /* No peers closer, we are the closest! */
998 * Select a peer from the routing table that would be a good routing
999 * destination for sending a message for "key". The resulting peer
1000 * must not be in the set of blocked peers.<p>
1002 * Note that we should not ALWAYS select the closest peer to the
1003 * target, peers further away from the target should be chosen with
1004 * exponentially declining probability.
1006 * FIXME: double-check that this is fine
1009 * @param key the key we are selecting a peer to route to
1010 * @param bloom a bloomfilter containing entries this request has seen already
1011 * @param hops how many hops has this message traversed thus far
1012 * @return Peer to route to, or NULL on error
1014 static struct PeerInfo *
1015 select_peer (const struct GNUNET_HashCode * key,
1016 const struct GNUNET_CONTAINER_BloomFilter *bloom, uint32_t hops)
1020 unsigned int selected;
1021 struct PeerInfo *pos;
1023 unsigned int smallest_distance;
1024 struct PeerInfo *chosen;
1026 if (hops >= GDS_NSE_get ())
1028 /* greedy selection (closest peer that is not in bloomfilter) */
1029 smallest_distance = UINT_MAX;
1031 for (bc = 0; bc <= closest_bucket; bc++)
1033 pos = k_buckets[bc].head;
1035 while ((pos != NULL) && (count < bucket_size))
1037 if ((bloom == NULL) ||
1039 GNUNET_CONTAINER_bloomfilter_test (bloom, &pos->id.hashPubKey)))
1041 dist = get_distance (key, &pos->id.hashPubKey);
1042 if (dist < smallest_distance)
1045 smallest_distance = dist;
1050 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1051 "Excluded peer `%s' due to BF match in greedy routing for %s\n",
1052 GNUNET_i2s (&pos->id), GNUNET_h2s (key));
1053 GNUNET_STATISTICS_update (GDS_stats,
1055 ("# Peers excluded from routing due to Bloomfilter"),
1057 dist = get_distance (key, &pos->id.hashPubKey);
1058 if (dist < smallest_distance)
1061 smallest_distance = dist;
1069 GNUNET_STATISTICS_update (GDS_stats,
1070 gettext_noop ("# Peer selection failed"), 1,
1075 /* select "random" peer */
1076 /* count number of peers that are available and not filtered */
1078 for (bc = 0; bc <= closest_bucket; bc++)
1080 pos = k_buckets[bc].head;
1081 while ((pos != NULL) && (count < bucket_size))
1083 if ((bloom != NULL) &&
1085 GNUNET_CONTAINER_bloomfilter_test (bloom, &pos->id.hashPubKey)))
1087 GNUNET_STATISTICS_update (GDS_stats,
1089 ("# Peers excluded from routing due to Bloomfilter"),
1091 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1092 "Excluded peer `%s' due to BF match in random routing for %s\n",
1093 GNUNET_i2s (&pos->id), GNUNET_h2s (key));
1095 continue; /* Ignore bloomfiltered peers */
1101 if (0 == count) /* No peers to select from! */
1103 GNUNET_STATISTICS_update (GDS_stats,
1104 gettext_noop ("# Peer selection failed"), 1,
1108 /* Now actually choose a peer */
1109 selected = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, count);
1111 for (bc = 0; bc <= closest_bucket; bc++)
1113 for (pos = k_buckets[bc].head; ((pos != NULL) && (count < bucket_size)); pos = pos->next)
1115 if ((bloom != NULL) &&
1117 GNUNET_CONTAINER_bloomfilter_test (bloom, &pos->id.hashPubKey)))
1119 continue; /* Ignore bloomfiltered peers */
1121 if (0 == selected--)
1131 * Compute the set of peers that the given request should be
1134 * @param key routing key
1135 * @param bloom bloom filter excluding peers as targets, all selected
1136 * peers will be added to the bloom filter
1137 * @param hop_count number of hops the request has traversed so far
1138 * @param target_replication desired number of replicas
1139 * @param targets where to store an array of target peers (to be
1140 * free'd by the caller)
1141 * @return number of peers returned in 'targets'.
1144 get_target_peers (const struct GNUNET_HashCode *key,
1145 struct GNUNET_CONTAINER_BloomFilter *bloom,
1146 uint32_t hop_count, uint32_t target_replication,
1147 struct PeerInfo ***targets)
1151 struct PeerInfo **rtargets;
1152 struct PeerInfo *nxt;
1154 GNUNET_assert (NULL != bloom);
1155 ret = get_forward_count (hop_count, target_replication);
1161 rtargets = GNUNET_malloc (sizeof (struct PeerInfo *) * ret);
1162 for (off = 0; off < ret; off++)
1164 nxt = select_peer (key, bloom, hop_count);
1167 rtargets[off] = nxt;
1168 GNUNET_break (GNUNET_NO ==
1169 GNUNET_CONTAINER_bloomfilter_test (bloom,
1170 &nxt->id.hashPubKey));
1171 GNUNET_CONTAINER_bloomfilter_add (bloom, &rtargets[off]->id.hashPubKey);
1173 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1174 "Selected %u/%u peers at hop %u for %s (target was %u)\n", off,
1175 GNUNET_CONTAINER_multihashmap_size (all_known_peers),
1176 (unsigned int) hop_count, GNUNET_h2s (key), ret);
1179 GNUNET_free (rtargets);
1183 *targets = rtargets;
1184 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1185 "Forwarding query `%s' to %u peers (goal was %u peers)\n",
1194 * Perform a PUT operation. Forwards the given request to other
1195 * peers. Does not store the data locally. Does not give the
1196 * data to local clients. May do nothing if this is the only
1197 * peer in the network (or if we are the closest peer in the
1200 * @param type type of the block
1201 * @param options routing options
1202 * @param desired_replication_level desired replication count
1203 * @param expiration_time when does the content expire
1204 * @param hop_count how many hops has this message traversed so far
1205 * @param bf Bloom filter of peers this PUT has already traversed
1206 * @param key key for the content
1207 * @param put_path_length number of entries in put_path
1208 * @param put_path peers this request has traversed so far (if tracked)
1209 * @param data payload to store
1210 * @param data_size number of bytes in data
1213 GDS_NEIGHBOURS_handle_put (enum GNUNET_BLOCK_Type type,
1214 enum GNUNET_DHT_RouteOption options,
1215 uint32_t desired_replication_level,
1216 struct GNUNET_TIME_Absolute expiration_time,
1218 struct GNUNET_CONTAINER_BloomFilter *bf,
1219 const struct GNUNET_HashCode * key,
1220 unsigned int put_path_length,
1221 struct GNUNET_PeerIdentity *put_path,
1222 const void *data, size_t data_size)
1224 unsigned int target_count;
1226 struct PeerInfo **targets;
1227 struct PeerInfo *target;
1228 struct P2PPendingMessage *pending;
1230 struct PeerPutMessage *ppm;
1231 struct GNUNET_PeerIdentity *pp;
1233 GNUNET_assert (NULL != bf);
1234 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1235 "Adding myself (%s) to PUT bloomfilter for %s\n",
1236 GNUNET_i2s (&my_identity), GNUNET_h2s (key));
1237 GNUNET_CONTAINER_bloomfilter_add (bf, &my_identity.hashPubKey);
1238 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# PUT requests routed"),
1241 get_target_peers (key, bf, hop_count, desired_replication_level,
1243 if (0 == target_count)
1245 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1246 "Routing PUT for %s terminates after %u hops at %s\n",
1247 GNUNET_h2s (key), (unsigned int) hop_count,
1248 GNUNET_i2s (&my_identity));
1252 put_path_length * sizeof (struct GNUNET_PeerIdentity) + data_size +
1253 sizeof (struct PeerPutMessage);
1254 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1256 put_path_length = 0;
1257 msize = data_size + sizeof (struct PeerPutMessage);
1259 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1262 GNUNET_free (targets);
1265 GNUNET_STATISTICS_update (GDS_stats,
1267 ("# PUT messages queued for transmission"),
1268 target_count, GNUNET_NO);
1269 for (i = 0; i < target_count; i++)
1271 target = targets[i];
1272 if (target->pending_count >= MAXIMUM_PENDING_PER_PEER)
1274 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# P2P messages dropped due to full queue"),
1276 continue; /* skip */
1278 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1279 "Routing PUT for %s after %u hops to %s\n", GNUNET_h2s (key),
1280 (unsigned int) hop_count, GNUNET_i2s (&target->id));
1281 pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
1282 pending->importance = 0; /* FIXME */
1283 pending->timeout = expiration_time;
1284 ppm = (struct PeerPutMessage *) &pending[1];
1285 pending->msg = &ppm->header;
1286 ppm->header.size = htons (msize);
1287 ppm->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_P2P_PUT);
1288 ppm->options = htonl (options);
1289 ppm->type = htonl (type);
1290 ppm->hop_count = htonl (hop_count + 1);
1291 ppm->desired_replication_level = htonl (desired_replication_level);
1292 ppm->put_path_length = htonl (put_path_length);
1293 ppm->expiration_time = GNUNET_TIME_absolute_hton (expiration_time);
1294 GNUNET_break (GNUNET_YES ==
1295 GNUNET_CONTAINER_bloomfilter_test (bf,
1296 &target->id.hashPubKey));
1297 GNUNET_assert (GNUNET_OK ==
1298 GNUNET_CONTAINER_bloomfilter_get_raw_data (bf,
1302 pp = (struct GNUNET_PeerIdentity *) &ppm[1];
1303 memcpy (pp, put_path,
1304 sizeof (struct GNUNET_PeerIdentity) * put_path_length);
1305 memcpy (&pp[put_path_length], data, data_size);
1306 GNUNET_CONTAINER_DLL_insert_tail (target->head, target->tail, pending);
1307 target->pending_count++;
1308 process_peer_queue (target);
1310 GNUNET_free (targets);
1315 * Perform a GET operation. Forwards the given request to other
1316 * peers. Does not lookup the key locally. May do nothing if this is
1317 * the only peer in the network (or if we are the closest peer in the
1320 * @param type type of the block
1321 * @param options routing options
1322 * @param desired_replication_level desired replication count
1323 * @param hop_count how many hops did this request traverse so far?
1324 * @param key key for the content
1325 * @param xquery extended query
1326 * @param xquery_size number of bytes in xquery
1327 * @param reply_bf bloomfilter to filter duplicates
1328 * @param reply_bf_mutator mutator for reply_bf
1329 * @param peer_bf filter for peers not to select (again)
1332 GDS_NEIGHBOURS_handle_get (enum GNUNET_BLOCK_Type type,
1333 enum GNUNET_DHT_RouteOption options,
1334 uint32_t desired_replication_level,
1335 uint32_t hop_count, const struct GNUNET_HashCode * key,
1336 const void *xquery, size_t xquery_size,
1337 const struct GNUNET_CONTAINER_BloomFilter *reply_bf,
1338 uint32_t reply_bf_mutator,
1339 struct GNUNET_CONTAINER_BloomFilter *peer_bf)
1341 unsigned int target_count;
1343 struct PeerInfo **targets;
1344 struct PeerInfo *target;
1345 struct P2PPendingMessage *pending;
1347 struct PeerGetMessage *pgm;
1349 size_t reply_bf_size;
1351 GNUNET_assert (NULL != peer_bf);
1352 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# GET requests routed"),
1355 get_target_peers (key, peer_bf, hop_count, desired_replication_level,
1357 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1358 "Adding myself (%s) to GET bloomfilter for %s\n",
1359 GNUNET_i2s (&my_identity), GNUNET_h2s (key));
1360 GNUNET_CONTAINER_bloomfilter_add (peer_bf, &my_identity.hashPubKey);
1361 if (0 == target_count)
1363 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1364 "Routing GET for %s terminates after %u hops at %s\n",
1365 GNUNET_h2s (key), (unsigned int) hop_count,
1366 GNUNET_i2s (&my_identity));
1369 reply_bf_size = GNUNET_CONTAINER_bloomfilter_get_size (reply_bf);
1370 msize = xquery_size + sizeof (struct PeerGetMessage) + reply_bf_size;
1371 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1374 GNUNET_free (targets);
1377 GNUNET_STATISTICS_update (GDS_stats,
1379 ("# GET messages queued for transmission"),
1380 target_count, GNUNET_NO);
1381 /* forward request */
1382 for (i = 0; i < target_count; i++)
1384 target = targets[i];
1385 if (target->pending_count >= MAXIMUM_PENDING_PER_PEER)
1387 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# P2P messages dropped due to full queue"),
1389 continue; /* skip */
1391 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1392 "Routing GET for %s after %u hops to %s\n", GNUNET_h2s (key),
1393 (unsigned int) hop_count, GNUNET_i2s (&target->id));
1394 pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
1395 pending->importance = 0; /* FIXME */
1396 pending->timeout = GNUNET_TIME_relative_to_absolute (GET_TIMEOUT);
1397 pgm = (struct PeerGetMessage *) &pending[1];
1398 pending->msg = &pgm->header;
1399 pgm->header.size = htons (msize);
1400 pgm->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_P2P_GET);
1401 pgm->options = htonl (options);
1402 pgm->type = htonl (type);
1403 pgm->hop_count = htonl (hop_count + 1);
1404 pgm->desired_replication_level = htonl (desired_replication_level);
1405 pgm->xquery_size = htonl (xquery_size);
1406 pgm->bf_mutator = reply_bf_mutator;
1407 GNUNET_break (GNUNET_YES ==
1408 GNUNET_CONTAINER_bloomfilter_test (peer_bf,
1409 &target->id.hashPubKey));
1410 GNUNET_assert (GNUNET_OK ==
1411 GNUNET_CONTAINER_bloomfilter_get_raw_data (peer_bf,
1415 xq = (char *) &pgm[1];
1416 memcpy (xq, xquery, xquery_size);
1417 if (NULL != reply_bf)
1418 GNUNET_assert (GNUNET_OK ==
1419 GNUNET_CONTAINER_bloomfilter_get_raw_data (reply_bf,
1423 GNUNET_CONTAINER_DLL_insert_tail (target->head, target->tail, pending);
1424 target->pending_count++;
1425 process_peer_queue (target);
1427 GNUNET_free (targets);
1432 * Handle a reply (route to origin). Only forwards the reply back to
1433 * the given peer. Does not do local caching or forwarding to local
1436 * @param target neighbour that should receive the block (if still connected)
1437 * @param type type of the block
1438 * @param expiration_time when does the content expire
1439 * @param key key for the content
1440 * @param put_path_length number of entries in put_path
1441 * @param put_path peers the original PUT traversed (if tracked)
1442 * @param get_path_length number of entries in put_path
1443 * @param get_path peers this reply has traversed so far (if tracked)
1444 * @param data payload of the reply
1445 * @param data_size number of bytes in data
1448 GDS_NEIGHBOURS_handle_reply (const struct GNUNET_PeerIdentity *target,
1449 enum GNUNET_BLOCK_Type type,
1450 struct GNUNET_TIME_Absolute expiration_time,
1451 const struct GNUNET_HashCode * key,
1452 unsigned int put_path_length,
1453 const struct GNUNET_PeerIdentity *put_path,
1454 unsigned int get_path_length,
1455 const struct GNUNET_PeerIdentity *get_path,
1456 const void *data, size_t data_size)
1458 struct PeerInfo *pi;
1459 struct P2PPendingMessage *pending;
1461 struct PeerResultMessage *prm;
1462 struct GNUNET_PeerIdentity *paths;
1465 data_size + sizeof (struct PeerResultMessage) + (get_path_length +
1467 sizeof (struct GNUNET_PeerIdentity);
1468 if ((msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE) ||
1470 GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)) ||
1472 GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)) ||
1473 (data_size > GNUNET_SERVER_MAX_MESSAGE_SIZE))
1478 pi = GNUNET_CONTAINER_multihashmap_get (all_known_peers, &target->hashPubKey);
1481 /* peer disconnected in the meantime, drop reply */
1484 if (pi->pending_count >= MAXIMUM_PENDING_PER_PEER)
1487 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# P2P messages dropped due to full queue"),
1492 GNUNET_STATISTICS_update (GDS_stats,
1494 ("# RESULT messages queued for transmission"), 1,
1496 pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
1497 pending->importance = 0; /* FIXME */
1498 pending->timeout = expiration_time;
1499 prm = (struct PeerResultMessage *) &pending[1];
1500 pending->msg = &prm->header;
1501 prm->header.size = htons (msize);
1502 prm->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_P2P_RESULT);
1503 prm->type = htonl (type);
1504 prm->put_path_length = htonl (put_path_length);
1505 prm->get_path_length = htonl (get_path_length);
1506 prm->expiration_time = GNUNET_TIME_absolute_hton (expiration_time);
1508 paths = (struct GNUNET_PeerIdentity *) &prm[1];
1509 memcpy (paths, put_path,
1510 put_path_length * sizeof (struct GNUNET_PeerIdentity));
1511 memcpy (&paths[put_path_length], get_path,
1512 get_path_length * sizeof (struct GNUNET_PeerIdentity));
1513 memcpy (&paths[put_path_length + get_path_length], data, data_size);
1514 GNUNET_CONTAINER_DLL_insert (pi->head, pi->tail, pending);
1515 pi->pending_count++;
1516 process_peer_queue (pi);
1521 * To be called on core init/fail.
1523 * @param cls service closure
1524 * @param server handle to the server for this service
1525 * @param identity the public identity of this peer
1528 core_init (void *cls, struct GNUNET_CORE_Handle *server,
1529 const struct GNUNET_PeerIdentity *identity)
1531 GNUNET_assert (server != NULL);
1532 my_identity = *identity;
1537 * Core handler for p2p put requests.
1539 * @param cls closure
1540 * @param peer sender of the request
1541 * @param message message
1542 * @param peer peer identity this notification is about
1543 * @return GNUNET_OK to keep the connection open,
1544 * GNUNET_SYSERR to close it (signal serious error)
1547 handle_dht_p2p_put (void *cls, const struct GNUNET_PeerIdentity *peer,
1548 const struct GNUNET_MessageHeader *message)
1550 const struct PeerPutMessage *put;
1551 const struct GNUNET_PeerIdentity *put_path;
1552 const void *payload;
1555 size_t payload_size;
1556 enum GNUNET_DHT_RouteOption options;
1557 struct GNUNET_CONTAINER_BloomFilter *bf;
1558 struct GNUNET_HashCode test_key;
1560 msize = ntohs (message->size);
1561 if (msize < sizeof (struct PeerPutMessage))
1563 GNUNET_break_op (0);
1566 put = (const struct PeerPutMessage *) message;
1567 putlen = ntohl (put->put_path_length);
1569 sizeof (struct PeerPutMessage) +
1570 putlen * sizeof (struct GNUNET_PeerIdentity)) ||
1572 GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)))
1574 GNUNET_break_op (0);
1577 GNUNET_STATISTICS_update (GDS_stats,
1578 gettext_noop ("# P2P PUT requests received"), 1,
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 if (GNUNET_YES == log_route_details_stderr)
1838 tmp = GNUNET_strdup (GNUNET_i2s (&my_identity));
1839 LOG_TRAFFIC (GNUNET_ERROR_TYPE_DEBUG,
1840 "XDHT GET %s: %s->%s (%u, %u=>%u) xq: %.*s\n",
1841 GNUNET_h2s (&get->key), GNUNET_i2s (peer), tmp,
1842 ntohl(get->hop_count),
1843 GNUNET_CRYPTO_hash_matching_bits (&peer->hashPubKey, &get->key),
1844 GNUNET_CRYPTO_hash_matching_bits (&my_identity.hashPubKey, &get->key),
1845 ntohl(get->xquery_size), xquery
1850 if (reply_bf_size > 0)
1852 GNUNET_CONTAINER_bloomfilter_init (&xquery[xquery_size], reply_bf_size,
1853 GNUNET_CONSTANTS_BLOOMFILTER_K);
1855 GNUNET_BLOCK_evaluate (GDS_block_context, type, &get->key, &reply_bf,
1856 get->bf_mutator, xquery, xquery_size, NULL, 0);
1857 if (eval != GNUNET_BLOCK_EVALUATION_REQUEST_VALID)
1859 /* request invalid or block type not supported */
1860 GNUNET_break_op (eval == GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED);
1861 if (NULL != reply_bf)
1862 GNUNET_CONTAINER_bloomfilter_free (reply_bf);
1866 GNUNET_CONTAINER_bloomfilter_init (get->bloomfilter, DHT_BLOOM_SIZE,
1867 GNUNET_CONSTANTS_BLOOMFILTER_K);
1868 GNUNET_break_op (GNUNET_YES ==
1869 GNUNET_CONTAINER_bloomfilter_test (peer_bf,
1870 &peer->hashPubKey));
1871 /* remember request for routing replies */
1872 GDS_ROUTING_add (peer, type, options, &get->key, xquery, xquery_size,
1873 reply_bf, get->bf_mutator);
1874 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "GET for %s at %s after %u hops\n",
1875 GNUNET_h2s (&get->key), GNUNET_i2s (&my_identity),
1876 (unsigned int) ntohl (get->hop_count));
1877 /* local lookup (this may update the reply_bf) */
1878 if ((0 != (options & GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE)) ||
1879 (am_closest_peer (&get->key, peer_bf)))
1881 if ((0 != (options & GNUNET_DHT_RO_FIND_PEER)))
1883 GNUNET_STATISTICS_update (GDS_stats,
1885 ("# P2P FIND PEER requests processed"), 1,
1887 handle_find_peer (peer, &get->key, reply_bf, get->bf_mutator);
1892 GDS_DATACACHE_handle_get (&get->key, type, xquery, xquery_size,
1893 &reply_bf, get->bf_mutator);
1898 GNUNET_STATISTICS_update (GDS_stats,
1899 gettext_noop ("# P2P GET requests ONLY routed"),
1903 GDS_CLIENTS_process_get (options,
1905 ntohl(get->hop_count),
1906 ntohl(get->desired_replication_level),
1910 /* P2P forwarding */
1911 if (eval != GNUNET_BLOCK_EVALUATION_OK_LAST)
1912 GDS_NEIGHBOURS_handle_get (type, options,
1913 ntohl (get->desired_replication_level),
1914 ntohl (get->hop_count), &get->key, xquery,
1915 xquery_size, reply_bf, get->bf_mutator, peer_bf);
1917 if (NULL != reply_bf)
1918 GNUNET_CONTAINER_bloomfilter_free (reply_bf);
1919 GNUNET_CONTAINER_bloomfilter_free (peer_bf);
1925 * Core handler for p2p result messages.
1927 * @param cls closure
1928 * @param message message
1929 * @param peer peer identity this notification is about
1930 * @return GNUNET_YES (do not cut p2p connection)
1933 handle_dht_p2p_result (void *cls, const struct GNUNET_PeerIdentity *peer,
1934 const struct GNUNET_MessageHeader *message)
1936 const struct PeerResultMessage *prm;
1937 const struct GNUNET_PeerIdentity *put_path;
1938 const struct GNUNET_PeerIdentity *get_path;
1940 uint32_t get_path_length;
1941 uint32_t put_path_length;
1944 enum GNUNET_BLOCK_Type type;
1946 /* parse and validate message */
1947 msize = ntohs (message->size);
1948 if (msize < sizeof (struct PeerResultMessage))
1950 GNUNET_break_op (0);
1953 prm = (struct PeerResultMessage *) message;
1954 put_path_length = ntohl (prm->put_path_length);
1955 get_path_length = ntohl (prm->get_path_length);
1957 sizeof (struct PeerResultMessage) + (get_path_length +
1959 sizeof (struct GNUNET_PeerIdentity)) ||
1961 GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)) ||
1963 GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)))
1965 GNUNET_break_op (0);
1968 put_path = (const struct GNUNET_PeerIdentity *) &prm[1];
1969 get_path = &put_path[put_path_length];
1970 type = ntohl (prm->type);
1971 data = (const void *) &get_path[get_path_length];
1973 msize - (sizeof (struct PeerResultMessage) +
1975 put_path_length) * sizeof (struct GNUNET_PeerIdentity));
1976 GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# P2P RESULTS received"),
1978 if (GNUNET_YES == log_route_details_stderr)
1982 tmp = GNUNET_strdup (GNUNET_i2s (&my_identity));
1983 LOG_TRAFFIC (GNUNET_ERROR_TYPE_DEBUG, "XDHT RESULT %s: %s->%s (%u)\n",
1984 GNUNET_h2s (&prm->key), GNUNET_i2s (peer), tmp,
1985 get_path_length + 1);
1988 /* if we got a HELLO, consider it for our own routing table */
1989 if (type == GNUNET_BLOCK_TYPE_DHT_HELLO)
1991 const struct GNUNET_MessageHeader *h;
1992 struct GNUNET_PeerIdentity pid;
1995 /* Should be a HELLO, validate and consider using it! */
1996 if (data_size < sizeof (struct GNUNET_MessageHeader))
1998 GNUNET_break_op (0);
2002 if (data_size != ntohs (h->size))
2004 GNUNET_break_op (0);
2008 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) h, &pid))
2010 GNUNET_break_op (0);
2013 if ((GNUNET_YES != disable_try_connect) &&
2014 0 != memcmp (&my_identity, &pid, sizeof (struct GNUNET_PeerIdentity)))
2016 bucket = find_bucket (&pid.hashPubKey);
2017 if ((bucket >= 0) &&
2018 (k_buckets[bucket].peers_size < bucket_size) &&
2019 (NULL != GDS_transport_handle))
2021 GNUNET_TRANSPORT_offer_hello (GDS_transport_handle, h, NULL, NULL);
2022 GNUNET_TRANSPORT_try_connect (GDS_transport_handle, &pid, NULL, NULL); /*FIXME TRY_CONNECT change */
2027 /* append 'peer' to 'get_path' */
2029 struct GNUNET_PeerIdentity xget_path[get_path_length + 1];
2031 memcpy (xget_path, get_path,
2032 get_path_length * sizeof (struct GNUNET_PeerIdentity));
2033 xget_path[get_path_length] = *peer;
2036 /* forward to local clients */
2037 GDS_CLIENTS_handle_reply (GNUNET_TIME_absolute_ntoh (prm->expiration_time),
2038 &prm->key, get_path_length, xget_path,
2039 put_path_length, put_path, type, data_size, data);
2040 GDS_CLIENTS_process_get_resp (type,
2041 xget_path, get_path_length,
2042 put_path, put_path_length,
2043 GNUNET_TIME_absolute_ntoh (
2044 prm->expiration_time),
2049 /* forward to other peers */
2050 GDS_ROUTING_process (type, GNUNET_TIME_absolute_ntoh (prm->expiration_time),
2051 &prm->key, put_path_length, put_path, get_path_length,
2052 xget_path, data, data_size);
2060 * Initialize neighbours subsystem.
2062 * @return GNUNET_OK on success, GNUNET_SYSERR on error
2065 GDS_NEIGHBOURS_init ()
2067 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
2068 {&handle_dht_p2p_get, GNUNET_MESSAGE_TYPE_DHT_P2P_GET, 0},
2069 {&handle_dht_p2p_put, GNUNET_MESSAGE_TYPE_DHT_P2P_PUT, 0},
2070 {&handle_dht_p2p_result, GNUNET_MESSAGE_TYPE_DHT_P2P_RESULT, 0},
2073 unsigned long long temp_config_num;
2076 = GNUNET_CONFIGURATION_get_value_yesno (GDS_cfg, "DHT", "DISABLE_TRY_CONNECT");
2078 GNUNET_CONFIGURATION_get_value_number (GDS_cfg, "DHT", "bucket_size",
2080 bucket_size = (unsigned int) temp_config_num;
2081 log_route_details_stderr =
2082 (NULL != getenv("GNUNET_DHT_ROUTE_DEBUG")) ? GNUNET_YES : GNUNET_NO;
2083 atsAPI = GNUNET_ATS_performance_init (GDS_cfg, NULL, NULL);
2085 GNUNET_CORE_connect (GDS_cfg, NULL, &core_init, &handle_core_connect,
2086 &handle_core_disconnect, NULL, GNUNET_NO, NULL,
2087 GNUNET_NO, core_handlers);
2088 if (coreAPI == NULL)
2089 return GNUNET_SYSERR;
2090 all_known_peers = GNUNET_CONTAINER_multihashmap_create (256, GNUNET_NO);
2096 * Shutdown neighbours subsystem.
2099 GDS_NEIGHBOURS_done ()
2101 if (coreAPI == NULL)
2103 GNUNET_CORE_disconnect (coreAPI);
2105 GNUNET_ATS_performance_done (atsAPI);
2107 GNUNET_assert (0 == GNUNET_CONTAINER_multihashmap_size (all_known_peers));
2108 GNUNET_CONTAINER_multihashmap_destroy (all_known_peers);
2109 all_known_peers = NULL;
2110 if (GNUNET_SCHEDULER_NO_TASK != find_peer_task)
2112 GNUNET_SCHEDULER_cancel (find_peer_task);
2113 find_peer_task = GNUNET_SCHEDULER_NO_TASK;
2118 * Get the ID of the local node.
2120 * @return identity of the local node
2122 struct GNUNET_PeerIdentity *
2123 GDS_NEIGHBOURS_get_id ()
2125 return &my_identity;
2129 /* end of gnunet-service-dht_neighbours.c */