2 This file is part of GNUnet
3 (C) 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
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
21 * @file set/gnunet-service-set_union.c
22 * @brief two-peer set operations
23 * @author Florian Dold
26 #include "gnunet_util_lib.h"
27 #include "gnunet-service-set.h"
29 #include "gnunet-service-set_union_strata_estimator.h"
30 #include "gnunet-service-set_protocol.h"
35 * Number of IBFs in a strata estimator.
37 #define SE_STRATA_COUNT 32
39 * Size of the IBFs in the strata estimator.
41 #define SE_IBF_SIZE 80
43 * hash num parameter for the difference digests and strata estimators
45 #define SE_IBF_HASH_NUM 4
48 * Number of buckets that can be transmitted in one message.
50 #define MAX_BUCKETS_PER_MESSAGE ((1<<15) / IBF_BUCKET_SIZE)
53 * The maximum size of an ibf we use is 2^(MAX_IBF_ORDER).
54 * Choose this value so that computing the IBF is still cheaper
55 * than transmitting all values.
57 #define MAX_IBF_ORDER (16)
60 * Number of buckets used in the ibf per estimated
67 * Current phase we are in for a union operation.
69 enum UnionOperationPhase
72 * We sent the request message, and expect a strata estimator
77 * We sent the strata estimator, and expect an IBF. This phase is entered once
78 * upon initialization and later via #PHASE_EXPECT_ELEMENTS_AND_REQUESTS.
80 * After receiving the complete IBF, we enter #PHASE_EXPECT_ELEMENTS
85 * Continuation for multi part IBFs.
87 PHASE_EXPECT_IBF_CONT,
90 * We are sending request and elements,
91 * and thus only expect elements from the other peer.
93 * We are currently decoding an IBF until it can no longer be decoded,
94 * we currently send requests and expect elements
95 * The remote peer is in #PHASE_EXPECT_ELEMENTS_AND_REQUESTS
97 PHASE_EXPECT_ELEMENTS,
100 * We are expecting elements and requests, and send
101 * requested elements back to the other peer.
103 * We are in this phase if we have SENT an IBF for the remote peer to decode.
104 * We expect requests, send elements or could receive an new IBF, which takes
105 * us via #PHASE_EXPECT_IBF to phase #PHASE_EXPECT_ELEMENTS
107 * The remote peer is thus in:
108 * #PHASE_EXPECT_ELEMENTS
110 PHASE_EXPECT_ELEMENTS_AND_REQUESTS,
113 * The protocol is over.
114 * Results may still have to be sent to the client.
121 * State of an evaluate operation with another peer.
123 struct OperationState
127 * Copy of the set's strata estimator at the time of
128 * creation of this operation
130 struct StrataEstimator *se;
133 * The ibf we currently receive
135 struct InvertibleBloomFilter *remote_ibf;
138 * IBF of the set's element.
140 struct InvertibleBloomFilter *local_ibf;
143 * Maps IBF-Keys (specific to the current salt) to elements.
144 * Used as a multihashmap, the keys being the lower 32bit of the IBF-Key.
145 * Colliding IBF-Keys are linked.
147 struct GNUNET_CONTAINER_MultiHashMap32 *key_to_element;
150 * Iterator for sending elements on the key to element mapping to the client.
152 struct GNUNET_CONTAINER_MultiHashMap32Iterator *full_result_iter;
155 * Current state of the operation.
157 enum UnionOperationPhase phase;
160 * Did we send the client that we are done?
162 int client_done_sent;
165 * Number of ibf buckets received
167 unsigned int ibf_buckets_received;
173 * The key entry is used to associate an ibf key with an element.
178 * IBF key for the entry, derived from the current salt.
180 struct IBF_Key ibf_key;
183 * The actual element associated with the key.
185 struct ElementEntry *element;
188 * Element that collides with this element
189 * on the ibf key. All colliding entries must have the same ibf key.
191 struct KeyEntry *next_colliding;
196 * Used as a closure for sending elements
197 * with a specific IBF key.
199 struct SendElementClosure
202 * The IBF key whose matching elements should be
205 struct IBF_Key ibf_key;
208 * Operation for which the elements
211 struct Operation *op;
216 * Extra state required for efficient set union.
221 * The strata estimator is only generated once for
223 * The IBF keys are derived from the element hashes with
226 struct StrataEstimator *se;
231 * Iterator over hash map entries, called to
232 * destroy the linked list of colliding ibf key entries.
235 * @param key current key code
236 * @param value value in the hash map
237 * @return #GNUNET_YES if we should continue to
242 destroy_key_to_element_iter (void *cls,
246 struct KeyEntry *k = value;
250 struct KeyEntry *k_tmp = k;
251 k = k->next_colliding;
252 if (GNUNET_YES == k_tmp->element->remote)
254 GNUNET_free (k_tmp->element);
255 k_tmp->element = NULL;
264 * Destroy the union operation. Only things specific to the union
265 * operation are destroyed.
267 * @param op union operation to destroy
270 union_op_cancel (struct Operation *op)
272 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
273 "destroying union op\n");
274 /* check if the op was canceled twice */
275 GNUNET_assert (NULL != op->state);
276 if (NULL != op->state->remote_ibf)
278 ibf_destroy (op->state->remote_ibf);
279 op->state->remote_ibf = NULL;
281 if (NULL != op->state->local_ibf)
283 ibf_destroy (op->state->local_ibf);
284 op->state->local_ibf = NULL;
286 if (NULL != op->state->se)
288 strata_estimator_destroy (op->state->se);
289 op->state->se = NULL;
291 if (NULL != op->state->key_to_element)
293 GNUNET_CONTAINER_multihashmap32_iterate (op->state->key_to_element,
294 &destroy_key_to_element_iter,
296 GNUNET_CONTAINER_multihashmap32_destroy (op->state->key_to_element);
297 op->state->key_to_element = NULL;
299 GNUNET_free (op->state);
301 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
302 "destroying union op done\n");
307 * Inform the client that the union operation has failed,
308 * and proceed to destroy the evaluate operation.
310 * @param op the union operation to fail
313 fail_union_operation (struct Operation *op)
315 struct GNUNET_MQ_Envelope *ev;
316 struct GNUNET_SET_ResultMessage *msg;
318 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
319 "union operation failed\n");
320 ev = GNUNET_MQ_msg (msg, GNUNET_MESSAGE_TYPE_SET_RESULT);
321 msg->result_status = htons (GNUNET_SET_STATUS_FAILURE);
322 msg->request_id = htonl (op->spec->client_request_id);
323 msg->element_type = htons (0);
324 GNUNET_MQ_send (op->spec->set->client_mq, ev);
325 _GSS_operation_destroy (op, GNUNET_YES);
330 * Derive the IBF key from a hash code and
333 * @param src the hash code
334 * @param salt salt to use
335 * @return the derived IBF key
337 static struct IBF_Key
338 get_ibf_key (const struct GNUNET_HashCode *src,
343 GNUNET_CRYPTO_hkdf (&key, sizeof (key),
344 GCRY_MD_SHA512, GCRY_MD_SHA256,
346 &salt, sizeof (salt),
353 * Iterator to create the mapping between ibf keys
354 * and element entries.
357 * @param key current key code
358 * @param value value in the hash map
359 * @return #GNUNET_YES if we should continue to iterate,
363 op_register_element_iterator (void *cls,
367 struct KeyEntry *const new_k = cls;
368 struct KeyEntry *old_k = value;
370 GNUNET_assert (NULL != old_k);
371 /* check if our ibf key collides with the ibf key in the existing entry */
372 if (old_k->ibf_key.key_val == new_k->ibf_key.key_val)
374 /* insert the the new key in the collision chain */
375 new_k->next_colliding = old_k->next_colliding;
376 old_k->next_colliding = new_k;
377 /* signal to the caller that we were able to insert into a colliding bucket */
385 * Iterator to create the mapping between ibf keys
386 * and element entries.
389 * @param key current key code
390 * @param value value in the hash map
391 * @return #GNUNET_YES (we should continue to iterate)
394 op_has_element_iterator (void *cls,
398 struct GNUNET_HashCode *element_hash = cls;
399 struct KeyEntry *k = value;
401 GNUNET_assert (NULL != k);
404 if (0 == GNUNET_CRYPTO_hash_cmp (&k->element->element_hash,
407 k = k->next_colliding;
414 * Determine whether the given element is already in the operation's element
417 * @param op operation that should be tested for 'element_hash'
418 * @param element_hash hash of the element to look for
419 * @return #GNUNET_YES if the element has been found, #GNUNET_NO otherwise
422 op_has_element (struct Operation *op,
423 const struct GNUNET_HashCode *element_hash)
426 struct IBF_Key ibf_key;
428 ibf_key = get_ibf_key (element_hash, op->spec->salt);
429 ret = GNUNET_CONTAINER_multihashmap32_get_multiple (op->state->key_to_element,
430 (uint32_t) ibf_key.key_val,
431 op_has_element_iterator,
432 (void *) element_hash);
434 /* was the iteration aborted because we found the element? */
435 if (GNUNET_SYSERR == ret)
442 * Insert an element into the union operation's
443 * key-to-element mapping. Takes ownership of 'ee'.
444 * Note that this does not insert the element in the set,
445 * only in the operation's key-element mapping.
446 * This is done to speed up re-tried operations, if some elements
447 * were transmitted, and then the IBF fails to decode.
449 * @param op the union operation
450 * @param ee the element entry
453 op_register_element (struct Operation *op,
454 struct ElementEntry *ee)
457 struct IBF_Key ibf_key;
460 ibf_key = get_ibf_key (&ee->element_hash, op->spec->salt);
461 k = GNUNET_new (struct KeyEntry);
463 k->ibf_key = ibf_key;
464 ret = GNUNET_CONTAINER_multihashmap32_get_multiple (op->state->key_to_element,
465 (uint32_t) ibf_key.key_val,
466 op_register_element_iterator,
469 /* was the element inserted into a colliding bucket? */
470 if (GNUNET_SYSERR == ret)
472 GNUNET_CONTAINER_multihashmap32_put (op->state->key_to_element,
473 (uint32_t) ibf_key.key_val,
475 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
480 * Insert a key into an ibf.
484 * @param value the key entry to get the key from
487 prepare_ibf_iterator (void *cls,
491 struct InvertibleBloomFilter *ibf = cls;
492 struct KeyEntry *ke = value;
494 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
495 "inserting %x into ibf\n",
496 ke->ibf_key.key_val);
497 ibf_insert (ibf, ke->ibf_key);
503 * Iterator for initializing the
504 * key-to-element mapping of a union operation
506 * @param cls the union operation `struct Operation *`
508 * @param value the `struct ElementEntry *` to insert
509 * into the key-to-element mapping
510 * @return #GNUNET_YES (to continue iterating)
513 init_key_to_element_iterator (void *cls,
514 const struct GNUNET_HashCode *key,
517 struct Operation *op = cls;
518 struct ElementEntry *e = value;
520 /* make sure that the element belongs to the set at the time
521 * of creating the operation */
522 if ( (e->generation_added > op->generation_created) ||
523 ( (GNUNET_YES == e->removed) &&
524 (e->generation_removed < op->generation_created)))
527 GNUNET_assert (GNUNET_NO == e->remote);
529 op_register_element (op, e);
535 * Create an ibf with the operation's elements
536 * of the specified size
538 * @param op the union operation
539 * @param size size of the ibf to create
542 prepare_ibf (struct Operation *op,
545 if (NULL == op->state->key_to_element)
548 len = GNUNET_CONTAINER_multihashmap_size (op->spec->set->elements);
549 op->state->key_to_element = GNUNET_CONTAINER_multihashmap32_create (len + 1);
550 GNUNET_CONTAINER_multihashmap_iterate (op->spec->set->elements,
551 init_key_to_element_iterator, op);
553 if (NULL != op->state->local_ibf)
554 ibf_destroy (op->state->local_ibf);
555 op->state->local_ibf = ibf_create (size, SE_IBF_HASH_NUM);
556 GNUNET_CONTAINER_multihashmap32_iterate (op->state->key_to_element,
557 &prepare_ibf_iterator,
558 op->state->local_ibf);
563 * Send an ibf of appropriate size.
565 * @param op the union operation
566 * @param ibf_order order of the ibf to send, size=2^order
569 send_ibf (struct Operation *op,
572 unsigned int buckets_sent = 0;
573 struct InvertibleBloomFilter *ibf;
575 prepare_ibf (op, 1<<ibf_order);
577 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
578 "sending ibf of size %u\n",
581 ibf = op->state->local_ibf;
583 while (buckets_sent < (1 << ibf_order))
585 unsigned int buckets_in_message;
586 struct GNUNET_MQ_Envelope *ev;
587 struct IBFMessage *msg;
589 buckets_in_message = (1 << ibf_order) - buckets_sent;
590 /* limit to maximum */
591 if (buckets_in_message > MAX_BUCKETS_PER_MESSAGE)
592 buckets_in_message = MAX_BUCKETS_PER_MESSAGE;
594 ev = GNUNET_MQ_msg_extra (msg, buckets_in_message * IBF_BUCKET_SIZE,
595 GNUNET_MESSAGE_TYPE_SET_UNION_P2P_IBF);
597 msg->order = ibf_order;
598 msg->offset = htons (buckets_sent);
599 ibf_write_slice (ibf, buckets_sent,
600 buckets_in_message, &msg[1]);
601 buckets_sent += buckets_in_message;
602 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
603 "ibf chunk size %u, %u/%u sent\n",
607 GNUNET_MQ_send (op->mq, ev);
610 op->state->phase = PHASE_EXPECT_ELEMENTS_AND_REQUESTS;
615 * Send a strata estimator to the remote peer.
617 * @param op the union operation with the remote peer
620 send_strata_estimator (struct Operation *op)
622 struct GNUNET_MQ_Envelope *ev;
623 struct GNUNET_MessageHeader *strata_msg;
625 ev = GNUNET_MQ_msg_header_extra (strata_msg,
626 SE_STRATA_COUNT * IBF_BUCKET_SIZE * SE_IBF_SIZE,
627 GNUNET_MESSAGE_TYPE_SET_UNION_P2P_SE);
628 strata_estimator_write (op->state->se, &strata_msg[1]);
629 GNUNET_MQ_send (op->mq, ev);
630 op->state->phase = PHASE_EXPECT_IBF;
631 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
632 "sent SE, expecting IBF\n");
637 * Compute the necessary order of an ibf
638 * from the size of the symmetric set difference.
640 * @param diff the difference
641 * @return the required size of the ibf
644 get_order_from_difference (unsigned int diff)
646 unsigned int ibf_order;
649 while ( (1<<ibf_order) < (IBF_ALPHA * diff) ||
650 ((1<<ibf_order) < SE_IBF_HASH_NUM) )
652 if (ibf_order > MAX_IBF_ORDER)
653 ibf_order = MAX_IBF_ORDER;
659 * Handle a strata estimator from a remote peer
661 * @param cls the union operation
662 * @param mh the message
665 handle_p2p_strata_estimator (void *cls,
666 const struct GNUNET_MessageHeader *mh)
668 struct Operation *op = cls;
669 struct StrataEstimator *remote_se;
672 if (op->state->phase != PHASE_EXPECT_SE)
674 fail_union_operation (op);
678 remote_se = strata_estimator_create (SE_STRATA_COUNT, SE_IBF_SIZE,
680 strata_estimator_read (&mh[1], remote_se);
681 GNUNET_assert (NULL != op->state->se);
682 diff = strata_estimator_difference (remote_se, op->state->se);
683 strata_estimator_destroy (remote_se);
684 strata_estimator_destroy (op->state->se);
685 op->state->se = NULL;
686 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
687 "got se diff=%d, using ibf size %d\n",
689 1<<get_order_from_difference (diff));
691 get_order_from_difference (diff));
697 * Iterator to send elements to a remote peer
699 * @param cls closure with the element key and the union operation
701 * @param value the key entry
704 send_element_iterator (void *cls,
708 struct SendElementClosure *sec = cls;
709 struct IBF_Key ibf_key = sec->ibf_key;
710 struct Operation *op = sec->op;
711 struct KeyEntry *ke = value;
713 if (ke->ibf_key.key_val != ibf_key.key_val)
717 const struct GNUNET_SET_Element *const element = &ke->element->element;
718 struct GNUNET_MQ_Envelope *ev;
719 struct GNUNET_MessageHeader *mh;
721 GNUNET_assert (ke->ibf_key.key_val == ibf_key.key_val);
722 ev = GNUNET_MQ_msg_header_extra (mh,
724 GNUNET_MESSAGE_TYPE_SET_P2P_ELEMENTS);
727 /* element too large */
734 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
735 "sending element (%s) to peer\n",
736 GNUNET_h2s (&ke->element->element_hash));
737 GNUNET_MQ_send (op->mq, ev);
738 ke = ke->next_colliding;
745 * Send all elements that have the specified IBF key
746 * to the remote peer of the union operation
748 * @param op union operation
749 * @param ibf_key IBF key of interest
752 send_elements_for_key (struct Operation *op, struct IBF_Key ibf_key)
754 struct SendElementClosure send_cls;
756 send_cls.ibf_key = ibf_key;
758 (void) GNUNET_CONTAINER_multihashmap32_get_multiple (op->state->key_to_element,
759 (uint32_t) ibf_key.key_val,
760 &send_element_iterator, &send_cls);
765 * Decode which elements are missing on each side, and
766 * send the appropriate elemens and requests
768 * @param op union operation
771 decode_and_send (struct Operation *op)
774 struct IBF_Key last_key;
776 unsigned int num_decoded;
777 struct InvertibleBloomFilter *diff_ibf;
779 GNUNET_assert (PHASE_EXPECT_ELEMENTS == op->state->phase);
781 prepare_ibf (op, op->state->remote_ibf->size);
782 diff_ibf = ibf_dup (op->state->local_ibf);
783 ibf_subtract (diff_ibf, op->state->remote_ibf);
785 ibf_destroy (op->state->remote_ibf);
786 op->state->remote_ibf = NULL;
788 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
789 "decoding IBF (size=%u)\n",
793 last_key.key_val = 0;
798 int cycle_detected = GNUNET_NO;
802 res = ibf_decode (diff_ibf, &side, &key);
803 if (res == GNUNET_OK)
805 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
806 "decoded ibf key %lx\n",
809 if ( (num_decoded > diff_ibf->size) ||
810 (num_decoded > 1 && last_key.key_val == key.key_val) )
812 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
813 "detected cyclic ibf (decoded %u/%u)\n",
816 cycle_detected = GNUNET_YES;
819 if ( (GNUNET_SYSERR == res) ||
820 (GNUNET_YES == cycle_detected) )
824 while (1<<next_order < diff_ibf->size)
827 if (next_order <= MAX_IBF_ORDER)
829 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
830 "decoding failed, sending larger ibf (size %u)\n",
832 send_ibf (op, next_order);
836 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
837 "set union failed: reached ibf limit\n");
841 if (GNUNET_NO == res)
843 struct GNUNET_MQ_Envelope *ev;
845 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
846 "transmitted all values, sending DONE\n");
847 ev = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_SET_UNION_P2P_DONE);
848 GNUNET_MQ_send (op->mq, ev);
853 send_elements_for_key (op, key);
857 struct GNUNET_MQ_Envelope *ev;
858 struct GNUNET_MessageHeader *msg;
860 /* It may be nice to merge multiple requests, but with cadet's corking it is not worth
861 * the effort additional complexity. */
862 ev = GNUNET_MQ_msg_header_extra (msg, sizeof (struct IBF_Key),
863 GNUNET_MESSAGE_TYPE_SET_P2P_ELEMENT_REQUESTS);
865 *(struct IBF_Key *) &msg[1] = key;
866 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
867 "sending element request\n");
868 GNUNET_MQ_send (op->mq, ev);
875 ibf_destroy (diff_ibf);
880 * Handle an IBF message from a remote peer.
882 * @param cls the union operation
883 * @param mh the header of the message
886 handle_p2p_ibf (void *cls, const struct GNUNET_MessageHeader *mh)
888 struct Operation *op = cls;
889 struct IBFMessage *msg = (struct IBFMessage *) mh;
890 unsigned int buckets_in_message;
892 if ( (op->state->phase == PHASE_EXPECT_ELEMENTS_AND_REQUESTS) ||
893 (op->state->phase == PHASE_EXPECT_IBF) )
895 op->state->phase = PHASE_EXPECT_IBF_CONT;
896 GNUNET_assert (NULL == op->state->remote_ibf);
897 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
898 "creating new ibf of size %u\n",
900 op->state->remote_ibf = ibf_create (1<<msg->order, SE_IBF_HASH_NUM);
901 op->state->ibf_buckets_received = 0;
902 if (0 != ntohs (msg->offset))
905 fail_union_operation (op);
909 else if (op->state->phase == PHASE_EXPECT_IBF_CONT)
911 if ( (ntohs (msg->offset) != op->state->ibf_buckets_received) ||
912 (1<<msg->order != op->state->remote_ibf->size) )
915 fail_union_operation (op);
920 buckets_in_message = (ntohs (msg->header.size) - sizeof *msg) / IBF_BUCKET_SIZE;
922 if (0 == buckets_in_message)
925 fail_union_operation (op);
929 if ((ntohs (msg->header.size) - sizeof *msg) != buckets_in_message * IBF_BUCKET_SIZE)
932 fail_union_operation (op);
936 ibf_read_slice (&msg[1],
937 op->state->ibf_buckets_received,
939 op->state->remote_ibf);
940 op->state->ibf_buckets_received += buckets_in_message;
942 if (op->state->ibf_buckets_received == op->state->remote_ibf->size)
944 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
945 "received full ibf\n");
946 op->state->phase = PHASE_EXPECT_ELEMENTS;
947 decode_and_send (op);
953 * Send a result message to the client indicating
954 * that there is a new element.
956 * @param op union operation
957 * @param element element to send
960 send_client_element (struct Operation *op,
961 struct GNUNET_SET_Element *element)
963 struct GNUNET_MQ_Envelope *ev;
964 struct GNUNET_SET_ResultMessage *rm;
966 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
967 "sending element (size %u) to client\n",
969 GNUNET_assert (0 != op->spec->client_request_id);
970 ev = GNUNET_MQ_msg_extra (rm, element->size, GNUNET_MESSAGE_TYPE_SET_RESULT);
973 GNUNET_MQ_discard (ev);
977 rm->result_status = htons (GNUNET_SET_STATUS_OK);
978 rm->request_id = htonl (op->spec->client_request_id);
979 rm->element_type = element->element_type;
980 memcpy (&rm[1], element->data, element->size);
981 GNUNET_MQ_send (op->spec->set->client_mq, ev);
986 * Signal to the client that the operation has finished and
987 * destroy the operation.
989 * @param cls operation to destroy
992 send_done_and_destroy (void *cls)
994 struct Operation *op = cls;
995 struct GNUNET_MQ_Envelope *ev;
996 struct GNUNET_SET_ResultMessage *rm;
999 ev = GNUNET_MQ_msg (rm, GNUNET_MESSAGE_TYPE_SET_RESULT);
1000 rm->request_id = htonl (op->spec->client_request_id);
1001 rm->result_status = htons (GNUNET_SET_STATUS_DONE);
1002 rm->element_type = htons (0);
1003 GNUNET_MQ_send (op->spec->set->client_mq, ev);
1004 _GSS_operation_destroy (op, GNUNET_YES);
1005 if (GNUNET_YES == keep)
1011 * Send all remaining elements in the full result iterator.
1013 * @param cls operation
1016 send_remaining_elements (void *cls)
1018 struct Operation *op = cls;
1019 struct KeyEntry *ke;
1022 res = GNUNET_CONTAINER_multihashmap32_iterator_next (op->state->full_result_iter,
1024 (const void **) &ke);
1025 if (GNUNET_NO == res)
1027 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1028 "sending done and destroy because iterator ran out\n");
1029 send_done_and_destroy (op);
1032 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1033 "sending elements from key entry\n");
1036 struct GNUNET_MQ_Envelope *ev;
1037 struct GNUNET_SET_ResultMessage *rm;
1038 struct GNUNET_SET_Element *element;
1039 element = &ke->element->element;
1041 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1042 "sending element (size %u) to client (full set)\n",
1044 GNUNET_assert (0 != op->spec->client_request_id);
1045 ev = GNUNET_MQ_msg_extra (rm, element->size, GNUNET_MESSAGE_TYPE_SET_RESULT);
1048 GNUNET_MQ_discard (ev);
1052 rm->result_status = htons (GNUNET_SET_STATUS_OK);
1053 rm->request_id = htonl (op->spec->client_request_id);
1054 rm->element_type = element->element_type;
1055 memcpy (&rm[1], element->data, element->size);
1056 if (NULL == ke->next_colliding)
1058 GNUNET_MQ_notify_sent (ev, send_remaining_elements, op);
1059 GNUNET_MQ_send (op->spec->set->client_mq, ev);
1062 GNUNET_MQ_send (op->spec->set->client_mq, ev);
1063 ke = ke->next_colliding;
1069 * Send a result message to the client indicating
1070 * that the operation is over.
1071 * After the result done message has been sent to the client,
1072 * destroy the evaluate operation.
1074 * @param op union operation
1077 finish_and_destroy (struct Operation *op)
1079 GNUNET_assert (GNUNET_NO == op->state->client_done_sent);
1081 if (GNUNET_SET_RESULT_FULL == op->spec->result_mode)
1083 /* prevent that the op is free'd by the tunnel end handler */
1084 op->keep = GNUNET_YES;
1085 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1086 "sending full result set\n");
1087 GNUNET_assert (NULL == op->state->full_result_iter);
1088 op->state->full_result_iter =
1089 GNUNET_CONTAINER_multihashmap32_iterator_create (op->state->key_to_element);
1090 send_remaining_elements (op);
1093 send_done_and_destroy (op);
1098 * Handle an element message from a remote peer.
1100 * @param cls the union operation
1101 * @param mh the message
1104 handle_p2p_elements (void *cls,
1105 const struct GNUNET_MessageHeader *mh)
1107 struct Operation *op = cls;
1108 struct ElementEntry *ee;
1109 uint16_t element_size;
1111 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1112 "got element from peer\n");
1114 if ( (op->state->phase != PHASE_EXPECT_ELEMENTS) &&
1115 (op->state->phase != PHASE_EXPECT_ELEMENTS_AND_REQUESTS) )
1117 fail_union_operation (op);
1121 element_size = ntohs (mh->size) - sizeof (struct GNUNET_MessageHeader);
1122 ee = GNUNET_malloc (sizeof (struct ElementEntry) + element_size);
1123 memcpy (&ee[1], &mh[1], element_size);
1124 ee->element.size = element_size;
1125 ee->element.data = &ee[1];
1126 ee->remote = GNUNET_YES;
1127 GNUNET_CRYPTO_hash (ee->element.data,
1131 if (GNUNET_YES == op_has_element (op, &ee->element_hash))
1133 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1134 "got existing element from peer\n");
1139 op_register_element (op, ee);
1140 /* only send results immediately if the client wants it */
1141 if (GNUNET_SET_RESULT_ADDED == op->spec->result_mode)
1142 send_client_element (op, &ee->element);
1147 * Handle an element request from a remote peer.
1149 * @param cls the union operation
1150 * @param mh the message
1153 handle_p2p_element_requests (void *cls,
1154 const struct GNUNET_MessageHeader *mh)
1156 struct Operation *op = cls;
1157 struct IBF_Key *ibf_key;
1158 unsigned int num_keys;
1160 /* look up elements and send them */
1161 if (op->state->phase != PHASE_EXPECT_ELEMENTS_AND_REQUESTS)
1164 fail_union_operation (op);
1168 num_keys = (ntohs (mh->size) - sizeof *mh) / sizeof (struct IBF_Key);
1170 if ((ntohs (mh->size) - sizeof *mh) != num_keys * sizeof (struct IBF_Key))
1173 fail_union_operation (op);
1177 ibf_key = (struct IBF_Key *) &mh[1];
1178 while (0 != num_keys--)
1180 send_elements_for_key (op, *ibf_key);
1187 * Handle a done message from a remote peer
1189 * @param cls the union operation
1190 * @param mh the message
1193 handle_p2p_done (void *cls, const struct GNUNET_MessageHeader *mh)
1195 struct Operation *op = cls;
1196 struct GNUNET_MQ_Envelope *ev;
1198 if (op->state->phase == PHASE_EXPECT_ELEMENTS_AND_REQUESTS)
1200 /* we got all requests, but still have to send our elements as response */
1202 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1203 "got DONE, sending final DONE after elements\n");
1204 op->state->phase = PHASE_FINISHED;
1205 ev = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_SET_UNION_P2P_DONE);
1206 GNUNET_MQ_send (op->mq, ev);
1209 if (op->state->phase == PHASE_EXPECT_ELEMENTS)
1211 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1212 "got final DONE\n");
1213 op->state->phase = PHASE_FINISHED;
1214 finish_and_destroy (op);
1218 fail_union_operation (op);
1223 * Initiate operation to evaluate a set union with a remote peer.
1225 * @param op operation to perform (to be initialized)
1226 * @param opaque_context message to be transmitted to the listener
1227 * to convince him to accept, may be NULL
1230 union_evaluate (struct Operation *op,
1231 const struct GNUNET_MessageHeader *opaque_context)
1233 struct GNUNET_MQ_Envelope *ev;
1234 struct OperationRequestMessage *msg;
1236 op->state = GNUNET_new (struct OperationState);
1237 /* copy the current generation's strata estimator for this operation */
1238 op->state->se = strata_estimator_dup (op->spec->set->state->se);
1239 /* we started the operation, thus we have to send the operation request */
1240 op->state->phase = PHASE_EXPECT_SE;
1241 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1242 "Initiating union operation evaluation\n");
1243 ev = GNUNET_MQ_msg_nested_mh (msg,
1244 GNUNET_MESSAGE_TYPE_SET_P2P_OPERATION_REQUEST,
1248 /* the context message is too large */
1250 GNUNET_SERVER_client_disconnect (op->spec->set->client);
1253 msg->operation = htonl (GNUNET_SET_OPERATION_UNION);
1254 msg->app_id = op->spec->app_id;
1255 GNUNET_MQ_send (op->mq, ev);
1257 if (NULL != opaque_context)
1258 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1259 "sent op request with context message\n");
1261 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1262 "sent op request without context message\n");
1267 * Accept an union operation request from a remote peer.
1268 * Only initializes the private operation state.
1270 * @param op operation that will be accepted as a union operation
1273 union_accept (struct Operation *op)
1275 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1276 "accepting set union operation\n");
1277 op->state = GNUNET_new (struct OperationState);
1278 op->state->se = strata_estimator_dup (op->spec->set->state->se);
1279 /* kick off the operation */
1280 send_strata_estimator (op);
1285 * Create a new set supporting the union operation
1287 * We maintain one strata estimator per set and then manipulate it over the
1288 * lifetime of the set, as recreating a strata estimator would be expensive.
1290 * @return the newly created set
1292 static struct SetState *
1293 union_set_create (void)
1295 struct SetState *set_state;
1297 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1298 "union set created\n");
1299 set_state = GNUNET_new (struct SetState);
1300 set_state->se = strata_estimator_create (SE_STRATA_COUNT,
1301 SE_IBF_SIZE, SE_IBF_HASH_NUM);
1307 * Add the element from the given element message to the set.
1309 * @param set_state state of the set want to add to
1310 * @param ee the element to add to the set
1313 union_add (struct SetState *set_state, struct ElementEntry *ee)
1315 strata_estimator_insert (set_state->se,
1316 get_ibf_key (&ee->element_hash, 0));
1321 * Remove the element given in the element message from the set.
1322 * Only marks the element as removed, so that older set operations can still exchange it.
1324 * @param set_state state of the set to remove from
1325 * @param ee set element to remove
1328 union_remove (struct SetState *set_state, struct ElementEntry *ee)
1330 strata_estimator_remove (set_state->se,
1331 get_ibf_key (&ee->element_hash, 0));
1336 * Destroy a set that supports the union operation.
1338 * @param set_state the set to destroy
1341 union_set_destroy (struct SetState *set_state)
1343 if (NULL != set_state->se)
1345 strata_estimator_destroy (set_state->se);
1346 set_state->se = NULL;
1348 GNUNET_free (set_state);
1353 * Dispatch messages for a union operation.
1355 * @param op the state of the union evaluate operation
1356 * @param mh the received message
1357 * @return GNUNET_SYSERR if the tunnel should be disconnected,
1358 * GNUNET_OK otherwise
1361 union_handle_p2p_message (struct Operation *op,
1362 const struct GNUNET_MessageHeader *mh)
1364 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1365 "received p2p message (t: %u, s: %u)\n",
1368 switch (ntohs (mh->type))
1370 case GNUNET_MESSAGE_TYPE_SET_UNION_P2P_IBF:
1371 handle_p2p_ibf (op, mh);
1373 case GNUNET_MESSAGE_TYPE_SET_UNION_P2P_SE:
1374 handle_p2p_strata_estimator (op, mh);
1376 case GNUNET_MESSAGE_TYPE_SET_P2P_ELEMENTS:
1377 handle_p2p_elements (op, mh);
1379 case GNUNET_MESSAGE_TYPE_SET_P2P_ELEMENT_REQUESTS:
1380 handle_p2p_element_requests (op, mh);
1382 case GNUNET_MESSAGE_TYPE_SET_UNION_P2P_DONE:
1383 handle_p2p_done (op, mh);
1386 /* something wrong with cadet's message handlers? */
1393 * handler for peer-disconnects, notifies the client
1394 * about the aborted operation in case the op was not concluded
1396 * @param op the destroyed operation
1399 union_peer_disconnect (struct Operation *op)
1401 if (PHASE_FINISHED != op->state->phase)
1403 struct GNUNET_MQ_Envelope *ev;
1404 struct GNUNET_SET_ResultMessage *msg;
1406 ev = GNUNET_MQ_msg (msg, GNUNET_MESSAGE_TYPE_SET_RESULT);
1407 msg->request_id = htonl (op->spec->client_request_id);
1408 msg->result_status = htons (GNUNET_SET_STATUS_FAILURE);
1409 msg->element_type = htons (0);
1410 GNUNET_MQ_send (op->spec->set->client_mq, ev);
1411 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1412 "other peer disconnected prematurely\n");
1413 _GSS_operation_destroy (op, GNUNET_YES);
1416 // else: the session has already been concluded
1417 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1418 "other peer disconnected (finished)\n");
1419 if (GNUNET_NO == op->state->client_done_sent)
1420 finish_and_destroy (op);
1425 * Get the table with implementing functions for
1428 * @return the operation specific VTable
1430 const struct SetVT *
1433 static const struct SetVT union_vt = {
1434 .create = &union_set_create,
1435 .msg_handler = &union_handle_p2p_message,
1437 .remove = &union_remove,
1438 .destroy_set = &union_set_destroy,
1439 .evaluate = &union_evaluate,
1440 .accept = &union_accept,
1441 .peer_disconnect = &union_peer_disconnect,
1442 .cancel = &union_op_cancel,