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22 * @file rps/gnunet-service-rps.c
23 * @brief rps service implementation
24 * @author Julius Bünger
27 #include "gnunet_util_lib.h"
28 #include "gnunet_cadet_service.h"
29 #include "gnunet_peerinfo_service.h"
30 #include "gnunet_nse_service.h"
32 #include "rps-test_util.h"
33 #include "gnunet-service-rps_sampler.h"
34 #include "gnunet-service-rps_custommap.h"
35 #include "gnunet-service-rps_peers.h"
36 #include "gnunet-service-rps_view.h"
41 #define LOG(kind, ...) GNUNET_log(kind, __VA_ARGS__)
43 // TODO modify @brief in every file
45 // TODO check for overflows
47 // TODO align message structs
49 // TODO connect to friends
51 // TODO store peers somewhere persistent
53 // TODO blacklist? (-> mal peer detection on top of brahms)
55 // hist_size_init, hist_size_max
60 static const struct GNUNET_CONFIGURATION_Handle *cfg;
65 static struct GNUNET_PeerIdentity own_identity;
68 /***********************************************************************
69 * Housekeeping with clients
70 ***********************************************************************/
73 * Closure used to pass the client and the id to the callback
74 * that replies to a client's request
81 struct ReplyCls *next;
82 struct ReplyCls *prev;
85 * The identifier of the request
90 * The handle to the request
92 struct RPS_SamplerRequestHandle *req_handle;
95 * The client handle to send the reply to
97 struct GNUNET_SERVER_Client *client;
102 * Struct used to store the context of a connected client.
109 struct ClientContext *next;
110 struct ClientContext *prev;
113 * The message queue to communicate with the client.
115 struct GNUNET_MQ_Handle *mq;
118 * DLL with handles to single requests from the client
120 struct ReplyCls *rep_cls_head;
121 struct ReplyCls *rep_cls_tail;
125 * DLL with all clients currently connected to us
127 struct ClientContext *cli_ctx_head;
128 struct ClientContext *cli_ctx_tail;
130 /***********************************************************************
131 * /Housekeeping with clients
132 ***********************************************************************/
138 /***********************************************************************
140 ***********************************************************************/
143 * Sampler used for the Brahms protocol itself.
145 static struct RPS_Sampler *prot_sampler;
148 * Sampler used for the clients.
150 static struct RPS_Sampler *client_sampler;
153 * Name to log view to
155 static char *file_name_view_log;
158 * The size of sampler we need to be able to satisfy the client's need
161 static unsigned int sampler_size_client_need;
164 * The size of sampler we need to be able to satisfy the Brahms protocol's
165 * need of random peers.
167 * This is one minimum size the sampler grows to.
169 static unsigned int sampler_size_est_need;
172 * Percentage of total peer number in the view
173 * to send random PUSHes to
178 * Percentage of total peer number in the view
179 * to send random PULLs to
184 * Identifier for the main task that runs periodically.
186 static struct GNUNET_SCHEDULER_Task *do_round_task;
189 * Time inverval the do_round task runs in.
191 static struct GNUNET_TIME_Relative round_interval;
194 * List to store peers received through pushes temporary.
196 static struct CustomPeerMap *push_map;
199 * List to store peers received through pulls temporary.
201 static struct CustomPeerMap *pull_map;
206 static struct GNUNET_NSE_Handle *nse;
211 static struct GNUNET_CADET_Handle *cadet_handle;
214 * Handler to PEERINFO.
216 static struct GNUNET_PEERINFO_Handle *peerinfo_handle;
219 * Handle for cancellation of iteration over peers.
221 static struct GNUNET_PEERINFO_NotifyContext *peerinfo_notify_handle;
226 * Counts how many requets clients already issued.
227 * Only needed in the beginning to check how many of the 64 deltas
230 static unsigned int req_counter;
233 * Time of the last request we received.
235 * Used to compute the expected request rate.
237 static struct GNUNET_TIME_Absolute last_request;
240 * Size of #request_deltas.
242 #define REQUEST_DELTAS_SIZE 64
243 static unsigned int request_deltas_size = REQUEST_DELTAS_SIZE;
246 * Last 64 deltas between requests
248 static struct GNUNET_TIME_Relative request_deltas[REQUEST_DELTAS_SIZE];
251 * The prediction of the rate of requests
253 static struct GNUNET_TIME_Relative request_rate;
256 #ifdef ENABLE_MALICIOUS
258 * Type of malicious peer
260 * 0 Don't act malicious at all - Default
261 * 1 Try to maximise representation
262 * 2 Try to partition the network
265 static uint32_t mal_type;
268 * Other malicious peers
270 static struct GNUNET_PeerIdentity *mal_peers;
273 * Hashmap of malicious peers used as set.
274 * Used to more efficiently check whether we know that peer.
276 static struct GNUNET_CONTAINER_MultiPeerMap *mal_peer_set;
279 * Number of other malicious peers
281 static uint32_t num_mal_peers;
285 * If type is 2 This struct is used to store the attacked peers in a DLL
292 struct AttackedPeer *next;
293 struct AttackedPeer *prev;
298 struct GNUNET_PeerIdentity peer_id;
302 * If type is 2 this is the DLL of attacked peers
304 static struct AttackedPeer *att_peers_head;
305 static struct AttackedPeer *att_peers_tail;
308 * This index is used to point to an attacked peer to
309 * implement the round-robin-ish way to select attacked peers.
311 static struct AttackedPeer *att_peer_index;
314 * Hashmap of attacked peers used as set.
315 * Used to more efficiently check whether we know that peer.
317 static struct GNUNET_CONTAINER_MultiPeerMap *att_peer_set;
320 * Number of attacked peers
322 static uint32_t num_attacked_peers;
325 * If type is 1 this is the attacked peer
327 static struct GNUNET_PeerIdentity attacked_peer;
330 * The limit of PUSHes we can send in one round.
331 * This is an assumption of the Brahms protocol and either implemented
334 * assumend to be the bandwidth limitation.
336 static uint32_t push_limit = 10000;
337 #endif /* ENABLE_MALICIOUS */
340 /***********************************************************************
342 ***********************************************************************/
345 /***********************************************************************
347 ***********************************************************************/
351 * Print peerlist to log.
354 print_peer_list (struct GNUNET_PeerIdentity *list,
359 LOG (GNUNET_ERROR_TYPE_DEBUG,
360 "Printing peer list of length %u at %p:\n",
363 for (i = 0 ; i < len ; i++)
365 LOG (GNUNET_ERROR_TYPE_DEBUG,
367 i, GNUNET_i2s (&list[i]));
373 * Remove peer from list.
376 rem_from_list (struct GNUNET_PeerIdentity **peer_list,
377 unsigned int *list_size,
378 const struct GNUNET_PeerIdentity *peer)
381 struct GNUNET_PeerIdentity *tmp;
385 LOG (GNUNET_ERROR_TYPE_DEBUG,
386 "Removing peer %s from list at %p\n",
390 for ( i = 0 ; i < *list_size ; i++ )
392 if (0 == GNUNET_CRYPTO_cmp_peer_identity (&tmp[i], peer))
394 if (i < *list_size -1)
395 { /* Not at the last entry -- shift peers left */
396 memcpy (&tmp[i], &tmp[i +1],
397 ((*list_size) - i -1) * sizeof (struct GNUNET_PeerIdentity));
399 /* Remove last entry (should be now useless PeerID) */
400 GNUNET_array_grow (tmp, *list_size, (*list_size) -1);
408 * Sum all time relatives of an array.
410 static struct GNUNET_TIME_Relative
411 T_relative_sum (const struct GNUNET_TIME_Relative *rel_array,
414 struct GNUNET_TIME_Relative sum;
417 sum = GNUNET_TIME_UNIT_ZERO;
418 for ( i = 0 ; i < arr_size ; i++ )
420 sum = GNUNET_TIME_relative_add (sum, rel_array[i]);
427 * Compute the average of given time relatives.
429 static struct GNUNET_TIME_Relative
430 T_relative_avg (const struct GNUNET_TIME_Relative *rel_array,
433 return GNUNET_TIME_relative_divide (T_relative_sum (rel_array,
440 * Insert PeerID in #view
442 * Called once we know a peer is live.
445 * @return GNUNET_OK if peer was actually inserted
446 * GNUNET_NO if peer was not inserted
449 insert_in_view_op (void *cls,
450 const struct GNUNET_PeerIdentity *peer);
453 * Insert PeerID in #view
455 * Called once we know a peer is live.
457 * @return GNUNET_OK if peer was actually inserted
458 * GNUNET_NO if peer was not inserted
461 insert_in_view (const struct GNUNET_PeerIdentity *peer)
465 online = Peers_check_peer_flag (peer, Peers_ONLINE);
466 if ( (GNUNET_NO == online) ||
467 (GNUNET_SYSERR == online) ) /* peer is not even known */
469 (void) Peers_check_peer_live (peer);
470 (void) Peers_schedule_operation (peer, insert_in_view_op);
473 return View_put (peer);
477 * Put random peer from sampler into the view as history update.
480 hist_update (void *cls,
481 struct GNUNET_PeerIdentity *ids,
486 for (i = 0; i < num_peers; i++)
488 (void) insert_in_view (&ids[i]);
489 to_file (file_name_view_log,
491 GNUNET_i2s_full (ids));
497 * Wrapper around #RPS_sampler_resize()
499 * If we do not have enough sampler elements, double current sampler size
500 * If we have more than enough sampler elements, halv current sampler size
503 resize_wrapper (struct RPS_Sampler *sampler, uint32_t new_size)
505 unsigned int sampler_size;
508 // TODO respect the min, max
509 sampler_size = RPS_sampler_get_size (sampler);
510 if (sampler_size > new_size * 4)
512 RPS_sampler_resize (sampler, sampler_size / 2);
514 else if (sampler_size < new_size)
516 RPS_sampler_resize (sampler, sampler_size * 2);
518 LOG (GNUNET_ERROR_TYPE_DEBUG, "sampler_size is now %u\n", sampler_size);
523 * Wrapper around #RPS_sampler_resize() resizing the client sampler
526 client_resize_wrapper ()
528 uint32_t bigger_size;
532 bigger_size = GNUNET_MAX (sampler_size_est_need, sampler_size_client_need);
534 // TODO respect the min, max
535 resize_wrapper (client_sampler, bigger_size);
536 LOG (GNUNET_ERROR_TYPE_DEBUG, "sampler_size_client is now %" PRIu32 "\n",
542 * Estimate request rate
544 * Called every time we receive a request from the client.
549 struct GNUNET_TIME_Relative max_round_duration;
551 if (request_deltas_size > req_counter)
553 if ( 1 < req_counter)
555 /* Shift last request deltas to the right */
556 memcpy (&request_deltas[1],
558 (req_counter - 1) * sizeof (struct GNUNET_TIME_Relative));
560 /* Add current delta to beginning */
562 GNUNET_TIME_absolute_get_difference (last_request,
563 GNUNET_TIME_absolute_get ());
564 request_rate = T_relative_avg (request_deltas, req_counter);
565 request_rate = (request_rate.rel_value_us < 1) ?
566 GNUNET_TIME_relative_get_unit_ () : request_rate;
568 /* Compute the duration a round will maximally take */
570 GNUNET_TIME_relative_add (round_interval,
571 GNUNET_TIME_relative_divide (round_interval, 2));
573 /* Set the estimated size the sampler has to have to
574 * satisfy the current client request rate */
575 sampler_size_client_need =
576 max_round_duration.rel_value_us / request_rate.rel_value_us;
578 /* Resize the sampler */
579 client_resize_wrapper ();
581 last_request = GNUNET_TIME_absolute_get ();
586 * Add all peers in @a peer_array to @a peer_map used as set.
588 * @param peer_array array containing the peers
589 * @param num_peers number of peers in @peer_array
590 * @param peer_map the peermap to use as set
593 add_peer_array_to_set (const struct GNUNET_PeerIdentity *peer_array,
594 unsigned int num_peers,
595 struct GNUNET_CONTAINER_MultiPeerMap *peer_map)
598 if (NULL == peer_map)
600 LOG (GNUNET_ERROR_TYPE_WARNING,
601 "Trying to add peers to non-existing peermap.\n");
605 for (i = 0; i < num_peers; i++)
607 GNUNET_CONTAINER_multipeermap_put (peer_map,
610 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
616 * Send a PULL REPLY to @a peer_id
618 * @param peer_id the peer to send the reply to.
619 * @param peer_ids the peers to send to @a peer_id
620 * @param num_peer_ids the number of peers to send to @a peer_id
623 send_pull_reply (const struct GNUNET_PeerIdentity *peer_id,
624 const struct GNUNET_PeerIdentity *peer_ids,
625 unsigned int num_peer_ids)
628 struct GNUNET_MQ_Envelope *ev;
629 struct GNUNET_RPS_P2P_PullReplyMessage *out_msg;
631 /* Compute actual size */
632 send_size = sizeof (struct GNUNET_RPS_P2P_PullReplyMessage) +
633 num_peer_ids * sizeof (struct GNUNET_PeerIdentity);
635 if (GNUNET_CONSTANTS_MAX_CADET_MESSAGE_SIZE < send_size)
636 /* Compute number of peers to send
637 * If too long, simply truncate */
638 // TODO select random ones via permutation
639 // or even better: do good protocol design
641 (GNUNET_CONSTANTS_MAX_CADET_MESSAGE_SIZE -
642 sizeof (struct GNUNET_RPS_P2P_PullReplyMessage)) /
643 sizeof (struct GNUNET_PeerIdentity);
645 send_size = num_peer_ids;
647 LOG (GNUNET_ERROR_TYPE_DEBUG,
648 "Going to send PULL REPLY with %u peers to %s\n",
649 send_size, GNUNET_i2s (peer_id));
651 ev = GNUNET_MQ_msg_extra (out_msg,
652 send_size * sizeof (struct GNUNET_PeerIdentity),
653 GNUNET_MESSAGE_TYPE_RPS_PP_PULL_REPLY);
654 out_msg->num_peers = htonl (send_size);
655 memcpy (&out_msg[1], peer_ids,
656 send_size * sizeof (struct GNUNET_PeerIdentity));
658 Peers_send_message (peer_id, ev, "PULL REPLY");
663 * Insert PeerID in #pull_map
665 * Called once we know a peer is live.
668 insert_in_pull_map (void *cls,
669 const struct GNUNET_PeerIdentity *peer)
671 CustomPeerMap_put (pull_map, peer);
676 * Insert PeerID in #view
678 * Called once we know a peer is live.
682 insert_in_view_op (void *cls,
683 const struct GNUNET_PeerIdentity *peer)
685 (void) insert_in_view (peer);
690 * Update sampler with given PeerID.
694 insert_in_sampler (void *cls,
695 const struct GNUNET_PeerIdentity *peer)
697 LOG (GNUNET_ERROR_TYPE_DEBUG,
698 "Updating samplers with peer %s from insert_in_sampler()\n",
700 RPS_sampler_update (prot_sampler, peer);
701 RPS_sampler_update (client_sampler, peer);
702 if (0 < RPS_sampler_count_id (prot_sampler, peer))
704 /* Make sure we 'know' about this peer */
705 (void) Peers_check_peer_live (peer);
706 /* Establish a channel towards that peer to indicate we are going to send
708 Peers_indicate_sending_intention (peer);
709 //Peers_issue_peer_liveliness_check (peer);
714 * @brief If @a peer was unknown, check liveliness and insert it in view and
717 * @param peer peer to insert
720 got_peer (const struct GNUNET_PeerIdentity *peer)
722 /* If we did not know this peer already, insert it into sampler and view */
723 if (GNUNET_YES == Peers_check_peer_live (peer))
725 Peers_schedule_operation (peer, insert_in_sampler);
726 Peers_schedule_operation (peer, insert_in_view_op);
731 * @brief Checks if there is a sending channel and if it is needed
733 * @param peer the peer whose sending channel is checked
734 * @return GNUNET_YES if sending channel exists and is still needed
735 * GNUNET_NO otherwise
738 check_sending_channel_needed (const struct GNUNET_PeerIdentity *peer)
740 /* struct GNUNET_CADET_Channel *channel; */
741 if (GNUNET_NO == Peers_check_peer_known (peer))
745 if (GNUNET_YES == Peers_check_sending_channel_exists (peer))
747 if ( (0 < RPS_sampler_count_id (prot_sampler, peer)) ||
748 (GNUNET_YES == View_contains_peer (peer)) ||
749 (GNUNET_YES == CustomPeerMap_contains_peer (push_map, peer)) ||
750 (GNUNET_YES == CustomPeerMap_contains_peer (pull_map, peer)) ||
751 (GNUNET_YES == Peers_check_peer_flag (peer, Peers_PULL_REPLY_PENDING)))
752 { /* If we want to keep the connection to peer open */
761 * @brief remove peer from our knowledge, the view, push and pull maps and
764 * @param peer the peer to remove
767 remove_peer (const struct GNUNET_PeerIdentity *peer)
769 View_remove_peer (peer);
770 CustomPeerMap_remove_peer (pull_map, peer);
771 CustomPeerMap_remove_peer (push_map, peer);
772 RPS_sampler_reinitialise_by_value (prot_sampler, peer);
773 RPS_sampler_reinitialise_by_value (client_sampler, peer);
774 Peers_remove_peer (peer);
779 * @brief Remove data that is not needed anymore.
781 * If the sending channel is no longer needed it is destroyed.
783 * @param peer the peer whose data is about to be cleaned
786 clean_peer (const struct GNUNET_PeerIdentity *peer)
788 if (GNUNET_NO == check_sending_channel_needed (peer))
790 #ifdef ENABLE_MALICIOUS
791 if (0 != GNUNET_CRYPTO_cmp_peer_identity (&attacked_peer, peer))
792 Peers_destroy_sending_channel (peer);
793 #else /* ENABLE_MALICIOUS */
794 Peers_destroy_sending_channel (peer);
795 #endif /* ENABLE_MALICIOUS */
798 if ( (GNUNET_NO == Peers_check_peer_send_intention (peer)) &&
799 (GNUNET_NO == View_contains_peer (peer)) &&
800 (GNUNET_NO == CustomPeerMap_contains_peer (push_map, peer)) &&
801 (GNUNET_NO == CustomPeerMap_contains_peer (push_map, peer)) &&
802 (0 == RPS_sampler_count_id (prot_sampler, peer)) &&
803 (0 == RPS_sampler_count_id (client_sampler, peer)) )
804 { /* We can safely remov this peer */
808 Peers_clean_peer (peer);
812 * @brief This is called when a channel is destroyed.
814 * Removes peer completely from our knowledge if the send_channel was destroyed
815 * Otherwise simply delete the recv_channel
817 * @param cls The closure
818 * @param channel The channel being closed
819 * @param channel_ctx The context associated with this channel
822 cleanup_destroyed_channel (void *cls,
823 const struct GNUNET_CADET_Channel *channel,
826 struct GNUNET_PeerIdentity *peer;
828 peer = (struct GNUNET_PeerIdentity *) GNUNET_CADET_channel_get_info (
829 (struct GNUNET_CADET_Channel *) channel, GNUNET_CADET_OPTION_PEER);
830 // FIXME wait for cadet to change this function
832 if (GNUNET_NO == Peers_check_peer_known (peer))
833 { /* We don't know a context to that peer */
834 LOG (GNUNET_ERROR_TYPE_WARNING,
835 "channel (%s) without associated context was destroyed\n",
840 if (GNUNET_YES == Peers_check_peer_flag (peer, Peers_TO_DESTROY))
841 { /* We are in the middle of removing that peer from our knowledge. In this
842 case simply make sure that the channels are cleaned. */
843 Peers_cleanup_destroyed_channel (cls, channel, channel_ctx);
844 to_file (file_name_view_log,
845 "-%s\t(cleanup channel, ourself)",
846 GNUNET_i2s_full (peer));
851 Peers_check_channel_role (peer, channel, Peers_CHANNEL_ROLE_SENDING))
852 { /* Channel used for sending was destroyed */
853 /* Possible causes of channel destruction:
854 * - ourselves -> cleaning send channel -> clean context
855 * - other peer -> peer probably went down -> remove
857 if (GNUNET_YES == Peers_check_channel_flag (channel_ctx, Peers_CHANNEL_CLEAN))
858 { /* We are about to clean the sending channel. Clean the respective
860 Peers_cleanup_destroyed_channel (cls, channel, channel_ctx);
864 { /* Other peer destroyed our sending channel that he is supposed to keep
865 * open. It probably went down. Remove it from our knowledge. */
866 Peers_cleanup_destroyed_channel (cls, channel, channel_ctx);
871 else if (GNUNET_YES ==
872 Peers_check_channel_role (peer, channel, Peers_CHANNEL_ROLE_RECEIVING))
873 { /* Channel used for receiving was destroyed */
874 /* Possible causes of channel destruction:
875 * - ourselves -> peer tried to establish channel twice -> clean context
876 * - other peer -> peer doesn't want to send us data -> clean
879 Peers_check_channel_flag (channel_ctx, Peers_CHANNEL_ESTABLISHED_TWICE))
880 { /* Other peer tried to establish a channel to us twice. We do not accept
881 * that. Clean the context. */
882 Peers_cleanup_destroyed_channel (cls, channel, channel_ctx);
886 { /* Other peer doesn't want to send us data anymore. We are free to clean
888 Peers_cleanup_destroyed_channel (cls, channel, channel_ctx);
895 LOG (GNUNET_ERROR_TYPE_WARNING,
896 "Destroyed channel is neither sending nor receiving channel\n");
900 /***********************************************************************
902 ***********************************************************************/
905 destroy_reply_cls (struct ReplyCls *rep_cls)
907 struct ClientContext *cli_ctx;
909 cli_ctx = GNUNET_SERVER_client_get_user_context (rep_cls->client,
910 struct ClientContext);
911 GNUNET_assert (NULL != cli_ctx);
912 GNUNET_CONTAINER_DLL_remove (cli_ctx->rep_cls_head,
913 cli_ctx->rep_cls_tail,
915 GNUNET_free (rep_cls);
920 destroy_cli_ctx (struct ClientContext *cli_ctx)
922 GNUNET_assert (NULL != cli_ctx);
923 if (NULL != cli_ctx->mq)
925 GNUNET_MQ_destroy (cli_ctx->mq);
927 if (NULL != cli_ctx->rep_cls_head)
929 LOG (GNUNET_ERROR_TYPE_WARNING,
930 "Trying to destroy the context of a client that still has pending requests. Going to clean those\n");
931 while (NULL != cli_ctx->rep_cls_head)
932 destroy_reply_cls (cli_ctx->rep_cls_head);
934 GNUNET_CONTAINER_DLL_remove (cli_ctx_head,
937 GNUNET_free (cli_ctx);
942 * Function called by NSE.
944 * Updates sizes of sampler list and view and adapt those lists
948 nse_callback (void *cls,
949 struct GNUNET_TIME_Absolute timestamp,
950 double logestimate, double std_dev)
953 //double scale; // TODO this might go gloabal/config
955 LOG (GNUNET_ERROR_TYPE_DEBUG,
956 "Received a ns estimate - logest: %f, std_dev: %f (old_size: %u)\n",
957 logestimate, std_dev, RPS_sampler_get_size (prot_sampler));
959 estimate = GNUNET_NSE_log_estimate_to_n (logestimate);
960 // GNUNET_NSE_log_estimate_to_n (logestimate);
961 estimate = pow (estimate, 1.0 / 3);
962 // TODO add if std_dev is a number
963 // estimate += (std_dev * scale);
964 if (2 < ceil (estimate))
966 LOG (GNUNET_ERROR_TYPE_DEBUG, "Changing estimate to %f\n", estimate);
967 sampler_size_est_need = estimate;
969 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not using estimate %f\n", estimate);
971 /* If the NSE has changed adapt the lists accordingly */
972 resize_wrapper (prot_sampler, sampler_size_est_need);
973 client_resize_wrapper ();
978 * Callback called once the requested PeerIDs are ready.
980 * Sends those to the requesting client.
983 client_respond (void *cls,
984 struct GNUNET_PeerIdentity *peer_ids,
988 struct GNUNET_MQ_Envelope *ev;
989 struct GNUNET_RPS_CS_ReplyMessage *out_msg;
990 struct ReplyCls *reply_cls = (struct ReplyCls *) cls;
991 uint32_t size_needed;
992 struct ClientContext *cli_ctx;
994 GNUNET_assert (NULL != reply_cls);
995 LOG (GNUNET_ERROR_TYPE_DEBUG,
996 "sampler returned %" PRIu32 " peers:\n",
998 for (i = 0; i < num_peers; i++)
1000 LOG (GNUNET_ERROR_TYPE_DEBUG,
1001 " %" PRIu32 ": %s\n",
1003 GNUNET_i2s (&peer_ids[i]));
1006 size_needed = sizeof (struct GNUNET_RPS_CS_ReplyMessage) +
1007 num_peers * sizeof (struct GNUNET_PeerIdentity);
1009 GNUNET_assert (GNUNET_SERVER_MAX_MESSAGE_SIZE >= size_needed);
1011 ev = GNUNET_MQ_msg_extra (out_msg,
1012 num_peers * sizeof (struct GNUNET_PeerIdentity),
1013 GNUNET_MESSAGE_TYPE_RPS_CS_REPLY);
1014 out_msg->num_peers = htonl (num_peers);
1015 out_msg->id = htonl (reply_cls->id);
1017 memcpy (&out_msg[1],
1019 num_peers * sizeof (struct GNUNET_PeerIdentity));
1020 GNUNET_free (peer_ids);
1022 cli_ctx = GNUNET_SERVER_client_get_user_context (reply_cls->client,
1023 struct ClientContext);
1024 GNUNET_assert (NULL != cli_ctx);
1025 destroy_reply_cls (reply_cls);
1026 GNUNET_MQ_send (cli_ctx->mq, ev);
1031 * Handle RPS request from the client.
1033 * @param cls closure
1034 * @param client identification of the client
1035 * @param message the actual message
1038 handle_client_request (void *cls,
1039 struct GNUNET_SERVER_Client *client,
1040 const struct GNUNET_MessageHeader *message)
1042 struct GNUNET_RPS_CS_RequestMessage *msg;
1044 uint32_t size_needed;
1045 struct ReplyCls *reply_cls;
1047 struct ClientContext *cli_ctx;
1049 msg = (struct GNUNET_RPS_CS_RequestMessage *) message;
1051 num_peers = ntohl (msg->num_peers);
1052 size_needed = sizeof (struct GNUNET_RPS_CS_RequestMessage) +
1053 num_peers * sizeof (struct GNUNET_PeerIdentity);
1055 if (GNUNET_SERVER_MAX_MESSAGE_SIZE < size_needed)
1057 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1058 "Message received from client has size larger than expected\n");
1059 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1063 for (i = 0 ; i < num_peers ; i++)
1066 LOG (GNUNET_ERROR_TYPE_DEBUG,
1067 "Client requested %" PRIu32 " random peer(s).\n",
1070 reply_cls = GNUNET_new (struct ReplyCls);
1071 reply_cls->id = ntohl (msg->id);
1072 reply_cls->client = client;
1073 reply_cls->req_handle = RPS_sampler_get_n_rand_peers (client_sampler,
1078 cli_ctx = GNUNET_SERVER_client_get_user_context (client, struct ClientContext);
1079 GNUNET_assert (NULL != cli_ctx);
1080 GNUNET_CONTAINER_DLL_insert (cli_ctx->rep_cls_head,
1081 cli_ctx->rep_cls_tail,
1083 GNUNET_SERVER_receive_done (client,
1089 * @brief Handle a message that requests the cancellation of a request
1092 * @param client the client that requests the cancellation
1093 * @param message the message containing the id of the request
1096 handle_client_request_cancel (void *cls,
1097 struct GNUNET_SERVER_Client *client,
1098 const struct GNUNET_MessageHeader *message)
1100 struct GNUNET_RPS_CS_RequestCancelMessage *msg =
1101 (struct GNUNET_RPS_CS_RequestCancelMessage *) message;
1102 struct ClientContext *cli_ctx;
1103 struct ReplyCls *rep_cls;
1105 cli_ctx = GNUNET_SERVER_client_get_user_context (client, struct ClientContext);
1106 GNUNET_assert (NULL != cli_ctx->rep_cls_head);
1107 rep_cls = cli_ctx->rep_cls_head;
1108 LOG (GNUNET_ERROR_TYPE_DEBUG,
1109 "Client cancels request with id %" PRIu32 "\n",
1111 while ( (NULL != rep_cls->next) &&
1112 (rep_cls->id != ntohl (msg->id)) )
1113 rep_cls = rep_cls->next;
1114 GNUNET_assert (rep_cls->id == ntohl (msg->id));
1115 RPS_sampler_request_cancel (rep_cls->req_handle);
1116 destroy_reply_cls (rep_cls);
1117 GNUNET_SERVER_receive_done (client,
1123 * Handle seed from the client.
1125 * @param cls closure
1126 * @param client identification of the client
1127 * @param message the actual message
1130 handle_client_seed (void *cls,
1131 struct GNUNET_SERVER_Client *client,
1132 const struct GNUNET_MessageHeader *message)
1134 struct GNUNET_RPS_CS_SeedMessage *in_msg;
1135 struct GNUNET_PeerIdentity *peers;
1139 if (sizeof (struct GNUNET_RPS_CS_SeedMessage) > ntohs (message->size))
1141 GNUNET_break_op (0);
1142 GNUNET_SERVER_receive_done (client,
1146 in_msg = (struct GNUNET_RPS_CS_SeedMessage *) message;
1147 num_peers = ntohl (in_msg->num_peers);
1148 peers = (struct GNUNET_PeerIdentity *) &in_msg[1];
1149 //peers = GNUNET_new_array (num_peers, struct GNUNET_PeerIdentity);
1150 //memcpy (peers, &in_msg[1], num_peers * sizeof (struct GNUNET_PeerIdentity));
1152 if ((ntohs (message->size) - sizeof (struct GNUNET_RPS_CS_SeedMessage)) /
1153 sizeof (struct GNUNET_PeerIdentity) != num_peers)
1155 GNUNET_break_op (0);
1156 GNUNET_SERVER_receive_done (client,
1161 LOG (GNUNET_ERROR_TYPE_DEBUG,
1162 "Client seeded peers:\n");
1163 print_peer_list (peers, num_peers);
1165 for (i = 0; i < num_peers; i++)
1167 LOG (GNUNET_ERROR_TYPE_DEBUG,
1168 "Updating samplers with seed %" PRIu32 ": %s\n",
1170 GNUNET_i2s (&peers[i]));
1172 got_peer (&peers[i]);
1174 //RPS_sampler_update (prot_sampler, &peers[i]);
1175 //RPS_sampler_update (client_sampler, &peers[i]);
1178 ////GNUNET_free (peers);
1180 GNUNET_SERVER_receive_done (client,
1186 * Handle a PUSH message from another peer.
1188 * Check the proof of work and store the PeerID
1189 * in the temporary list for pushed PeerIDs.
1191 * @param cls Closure
1192 * @param channel The channel the PUSH was received over
1193 * @param channel_ctx The context associated with this channel
1194 * @param msg The message header
1197 handle_peer_push (void *cls,
1198 struct GNUNET_CADET_Channel *channel,
1200 const struct GNUNET_MessageHeader *msg)
1202 const struct GNUNET_PeerIdentity *peer;
1204 // (check the proof of work (?))
1206 peer = (const struct GNUNET_PeerIdentity *)
1207 GNUNET_CADET_channel_get_info (channel, GNUNET_CADET_OPTION_PEER);
1208 // FIXME wait for cadet to change this function
1210 LOG (GNUNET_ERROR_TYPE_DEBUG,
1211 "Received PUSH (%s)\n",
1214 #ifdef ENABLE_MALICIOUS
1215 struct AttackedPeer *tmp_att_peer;
1217 tmp_att_peer = GNUNET_new (struct AttackedPeer);
1218 memcpy (&tmp_att_peer->peer_id, peer, sizeof (struct GNUNET_PeerIdentity));
1221 { /* Try to maximise representation */
1222 if (NULL == att_peer_set)
1223 att_peer_set = GNUNET_CONTAINER_multipeermap_create (1, GNUNET_NO);
1224 if (GNUNET_NO == GNUNET_CONTAINER_multipeermap_contains (att_peer_set,
1227 GNUNET_CONTAINER_DLL_insert (att_peers_head,
1230 add_peer_array_to_set (peer, 1, att_peer_set);
1236 else if (2 == mal_type)
1237 { /* We attack one single well-known peer - simply ignore */
1242 GNUNET_free (tmp_att_peer);
1245 #endif /* ENABLE_MALICIOUS */
1247 /* Add the sending peer to the push_map */
1248 CustomPeerMap_put (push_map, peer);
1250 GNUNET_CADET_receive_done (channel);
1256 * Handle PULL REQUEST request message from another peer.
1258 * Reply with the view of PeerIDs.
1260 * @param cls Closure
1261 * @param channel The channel the PULL REQUEST was received over
1262 * @param channel_ctx The context associated with this channel
1263 * @param msg The message header
1266 handle_peer_pull_request (void *cls,
1267 struct GNUNET_CADET_Channel *channel,
1269 const struct GNUNET_MessageHeader *msg)
1271 struct GNUNET_PeerIdentity *peer;
1272 const struct GNUNET_PeerIdentity *view_array;
1274 peer = (struct GNUNET_PeerIdentity *)
1275 GNUNET_CADET_channel_get_info (channel,
1276 GNUNET_CADET_OPTION_PEER);
1277 // FIXME wait for cadet to change this function
1279 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received PULL REQUEST (%s)\n", GNUNET_i2s (peer));
1281 #ifdef ENABLE_MALICIOUS
1284 { /* Try to maximise representation */
1285 send_pull_reply (peer, mal_peers, num_mal_peers);
1289 else if (2 == mal_type)
1290 { /* Try to partition network */
1291 if (0 == GNUNET_CRYPTO_cmp_peer_identity (&attacked_peer, peer))
1293 send_pull_reply (peer, mal_peers, num_mal_peers);
1297 #endif /* ENABLE_MALICIOUS */
1299 view_array = View_get_as_array ();
1301 send_pull_reply (peer, view_array, View_size ());
1303 GNUNET_CADET_receive_done (channel);
1309 * Handle PULL REPLY message from another peer.
1311 * Check whether we sent a corresponding request and
1312 * whether this reply is the first one.
1314 * @param cls Closure
1315 * @param channel The channel the PUSH was received over
1316 * @param channel_ctx The context associated with this channel
1317 * @param msg The message header
1320 handle_peer_pull_reply (void *cls,
1321 struct GNUNET_CADET_Channel *channel,
1323 const struct GNUNET_MessageHeader *msg)
1325 struct GNUNET_RPS_P2P_PullReplyMessage *in_msg;
1326 struct GNUNET_PeerIdentity *peers;
1327 struct GNUNET_PeerIdentity *sender;
1329 #ifdef ENABLE_MALICIOUS
1330 struct AttackedPeer *tmp_att_peer;
1331 #endif /* ENABLE_MALICIOUS */
1333 /* Check for protocol violation */
1334 if (sizeof (struct GNUNET_RPS_P2P_PullReplyMessage) > ntohs (msg->size))
1336 GNUNET_break_op (0);
1337 GNUNET_CADET_receive_done (channel);
1338 return GNUNET_SYSERR;
1341 in_msg = (struct GNUNET_RPS_P2P_PullReplyMessage *) msg;
1342 if ((ntohs (msg->size) - sizeof (struct GNUNET_RPS_P2P_PullReplyMessage)) /
1343 sizeof (struct GNUNET_PeerIdentity) != ntohl (in_msg->num_peers))
1345 LOG (GNUNET_ERROR_TYPE_ERROR,
1346 "message says it sends %" PRIu32 " peers, have space for %lu peers\n",
1347 ntohl (in_msg->num_peers),
1348 (ntohs (msg->size) - sizeof (struct GNUNET_RPS_P2P_PullReplyMessage)) /
1349 sizeof (struct GNUNET_PeerIdentity));
1350 GNUNET_break_op (0);
1351 GNUNET_CADET_receive_done (channel);
1352 return GNUNET_SYSERR;
1355 // Guess simply casting isn't the nicest way...
1356 // FIXME wait for cadet to change this function
1357 sender = (struct GNUNET_PeerIdentity *)
1358 GNUNET_CADET_channel_get_info (channel, GNUNET_CADET_OPTION_PEER);
1360 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received PULL REPLY (%s)\n", GNUNET_i2s (sender));
1362 if (GNUNET_YES != Peers_check_peer_flag (sender, Peers_PULL_REPLY_PENDING))
1364 LOG (GNUNET_ERROR_TYPE_WARNING,
1365 "Received a pull reply from a peer we didn't request one from!\n");
1366 GNUNET_break_op (0);
1367 GNUNET_CADET_receive_done (channel);
1372 #ifdef ENABLE_MALICIOUS
1373 // We shouldn't even receive pull replies as we're not sending
1376 #endif /* ENABLE_MALICIOUS */
1378 /* Do actual logic */
1379 peers = (struct GNUNET_PeerIdentity *) &in_msg[1];
1381 LOG (GNUNET_ERROR_TYPE_DEBUG,
1382 "PULL REPLY received, got following %u peers:\n",
1383 ntohl (in_msg->num_peers));
1385 for (i = 0 ; i < ntohl (in_msg->num_peers) ; i++)
1387 LOG (GNUNET_ERROR_TYPE_DEBUG,
1390 GNUNET_i2s (&peers[i]));
1392 #ifdef ENABLE_MALICIOUS
1393 if ((NULL != att_peer_set) &&
1394 (1 == mal_type || 3 == mal_type))
1395 { /* Add attacked peer to local list */
1396 // TODO check if we sent a request and this was the first reply
1397 if (GNUNET_NO == GNUNET_CONTAINER_multipeermap_contains (att_peer_set,
1399 && GNUNET_NO == GNUNET_CONTAINER_multipeermap_contains (mal_peer_set,
1401 && 0 != GNUNET_CRYPTO_cmp_peer_identity (&peers[i],
1404 tmp_att_peer = GNUNET_new (struct AttackedPeer);
1405 tmp_att_peer->peer_id = peers[i];
1406 GNUNET_CONTAINER_DLL_insert (att_peers_head,
1409 add_peer_array_to_set (&peers[i], 1, att_peer_set);
1413 #endif /* ENABLE_MALICIOUS */
1414 if (0 != GNUNET_CRYPTO_cmp_peer_identity (&own_identity,
1417 /* Make sure we 'know' about this peer */
1418 (void) Peers_check_peer_live (&peers[i]);
1420 if (GNUNET_YES == Peers_check_peer_valid (&peers[i]))
1422 CustomPeerMap_put (pull_map, &peers[i]);
1426 Peers_schedule_operation (&peers[i], insert_in_pull_map);
1427 Peers_issue_peer_liveliness_check (&peers[i]);
1432 Peers_unset_peer_flag (sender, Peers_PULL_REPLY_PENDING);
1433 clean_peer (sender);
1435 GNUNET_CADET_receive_done (channel);
1441 * Compute a random delay.
1442 * A uniformly distributed value between mean + spread and mean - spread.
1444 * For example for mean 4 min and spread 2 the minimum is (4 min - (1/2 * 4 min))
1445 * It would return a random value between 2 and 6 min.
1447 * @param mean the mean
1448 * @param spread the inverse amount of deviation from the mean
1450 static struct GNUNET_TIME_Relative
1451 compute_rand_delay (struct GNUNET_TIME_Relative mean,
1452 unsigned int spread)
1454 struct GNUNET_TIME_Relative half_interval;
1455 struct GNUNET_TIME_Relative ret;
1456 unsigned int rand_delay;
1457 unsigned int max_rand_delay;
1461 LOG (GNUNET_ERROR_TYPE_WARNING,
1462 "Not accepting spread of 0\n");
1466 /* Compute random time value between spread * mean and spread * mean */
1467 half_interval = GNUNET_TIME_relative_divide (mean, spread);
1469 max_rand_delay = GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us / mean.rel_value_us * (2/spread);
1471 * Compute random value between (0 and 1) * round_interval
1472 * via multiplying round_interval with a 'fraction' (0 to value)/value
1474 rand_delay = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, max_rand_delay);
1475 ret = GNUNET_TIME_relative_multiply (mean, rand_delay);
1476 ret = GNUNET_TIME_relative_divide (ret, max_rand_delay);
1477 ret = GNUNET_TIME_relative_add (ret, half_interval);
1479 if (GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us == ret.rel_value_us)
1480 LOG (GNUNET_ERROR_TYPE_WARNING,
1481 "Returning FOREVER_REL\n");
1488 * Send single pull request
1490 * @param peer_id the peer to send the pull request to.
1493 send_pull_request (const struct GNUNET_PeerIdentity *peer)
1495 struct GNUNET_MQ_Envelope *ev;
1497 GNUNET_assert (GNUNET_NO == Peers_check_peer_flag (peer,
1498 Peers_PULL_REPLY_PENDING));
1499 Peers_set_peer_flag (peer, Peers_PULL_REPLY_PENDING);
1501 LOG (GNUNET_ERROR_TYPE_DEBUG,
1502 "Going to send PULL REQUEST to peer %s.\n",
1505 ev = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_RPS_PP_PULL_REQUEST);
1506 Peers_send_message (peer, ev, "PULL REQUEST");
1513 * @param peer_id the peer to send the push to.
1516 send_push (const struct GNUNET_PeerIdentity *peer_id)
1518 struct GNUNET_MQ_Envelope *ev;
1520 LOG (GNUNET_ERROR_TYPE_DEBUG,
1521 "Going to send PUSH to peer %s.\n",
1522 GNUNET_i2s (peer_id));
1524 ev = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_RPS_PP_PUSH);
1525 Peers_send_message (peer_id, ev, "PUSH");
1530 do_round (void *cls);
1533 do_mal_round (void *cls);
1536 #ifdef ENABLE_MALICIOUS
1538 * Turn RPS service to act malicious.
1540 * @param cls Closure
1541 * @param client The client that sent the message
1542 * @param msg The message header
1545 handle_client_act_malicious (void *cls,
1546 struct GNUNET_SERVER_Client *client,
1547 const struct GNUNET_MessageHeader *msg)
1549 struct GNUNET_RPS_CS_ActMaliciousMessage *in_msg;
1550 struct GNUNET_PeerIdentity *peers;
1551 uint32_t num_mal_peers_sent;
1552 uint32_t num_mal_peers_old;
1554 /* Check for protocol violation */
1555 if (sizeof (struct GNUNET_RPS_CS_ActMaliciousMessage) > ntohs (msg->size))
1557 GNUNET_break_op (0);
1560 in_msg = (struct GNUNET_RPS_CS_ActMaliciousMessage *) msg;
1561 if ((ntohs (msg->size) - sizeof (struct GNUNET_RPS_CS_ActMaliciousMessage)) /
1562 sizeof (struct GNUNET_PeerIdentity) != ntohl (in_msg->num_peers))
1564 LOG (GNUNET_ERROR_TYPE_ERROR,
1565 "message says it sends %" PRIu32 " peers, have space for %lu peers\n",
1566 ntohl (in_msg->num_peers),
1567 (ntohs (msg->size) - sizeof (struct GNUNET_RPS_CS_ActMaliciousMessage)) /
1568 sizeof (struct GNUNET_PeerIdentity));
1569 GNUNET_break_op (0);
1573 /* Do actual logic */
1574 peers = (struct GNUNET_PeerIdentity *) &msg[1];
1575 mal_type = ntohl (in_msg->type);
1576 if (NULL == mal_peer_set)
1577 mal_peer_set = GNUNET_CONTAINER_multipeermap_create (1, GNUNET_NO);
1579 LOG (GNUNET_ERROR_TYPE_DEBUG,
1580 "Now acting malicious type %" PRIu32 ", got %" PRIu32 " peers.\n",
1582 ntohl (in_msg->num_peers));
1585 { /* Try to maximise representation */
1586 /* Add other malicious peers to those we already know */
1588 num_mal_peers_sent = ntohl (in_msg->num_peers);
1589 num_mal_peers_old = num_mal_peers;
1590 GNUNET_array_grow (mal_peers,
1592 num_mal_peers + num_mal_peers_sent);
1593 memcpy (&mal_peers[num_mal_peers_old],
1595 num_mal_peers_sent * sizeof (struct GNUNET_PeerIdentity));
1597 /* Add all mal peers to mal_peer_set */
1598 add_peer_array_to_set (&mal_peers[num_mal_peers_old],
1602 /* Substitute do_round () with do_mal_round () */
1603 GNUNET_SCHEDULER_cancel (do_round_task);
1604 do_round_task = GNUNET_SCHEDULER_add_now (&do_mal_round, NULL);
1607 else if ( (2 == mal_type) ||
1609 { /* Try to partition the network */
1610 /* Add other malicious peers to those we already know */
1612 num_mal_peers_sent = ntohl (in_msg->num_peers) - 1;
1613 num_mal_peers_old = num_mal_peers;
1614 GNUNET_array_grow (mal_peers,
1616 num_mal_peers + num_mal_peers_sent);
1617 if (NULL != mal_peers &&
1620 memcpy (&mal_peers[num_mal_peers_old],
1622 num_mal_peers_sent * sizeof (struct GNUNET_PeerIdentity));
1624 /* Add all mal peers to mal_peer_set */
1625 add_peer_array_to_set (&mal_peers[num_mal_peers_old],
1630 /* Store the one attacked peer */
1631 memcpy (&attacked_peer,
1632 &in_msg->attacked_peer,
1633 sizeof (struct GNUNET_PeerIdentity));
1634 /* Set the flag of the attacked peer to valid to avoid problems */
1635 if (GNUNET_NO == Peers_check_peer_known (&attacked_peer))
1637 Peers_check_peer_live (&attacked_peer);
1638 Peers_issue_peer_liveliness_check (&attacked_peer);
1641 LOG (GNUNET_ERROR_TYPE_DEBUG,
1642 "Attacked peer is %s\n",
1643 GNUNET_i2s (&attacked_peer));
1645 /* Substitute do_round () with do_mal_round () */
1646 GNUNET_SCHEDULER_cancel (do_round_task);
1647 do_round_task = GNUNET_SCHEDULER_add_now (&do_mal_round, NULL);
1649 else if (0 == mal_type)
1650 { /* Stop acting malicious */
1651 GNUNET_array_grow (mal_peers, num_mal_peers, 0);
1653 /* Substitute do_mal_round () with do_round () */
1654 GNUNET_SCHEDULER_cancel (do_round_task);
1655 do_round_task = GNUNET_SCHEDULER_add_now (&do_round, NULL);
1661 GNUNET_SERVER_receive_done (client,
1667 * Send out PUSHes and PULLs maliciously.
1669 * This is executed regylary.
1672 do_mal_round (void *cls)
1674 uint32_t num_pushes;
1676 struct GNUNET_TIME_Relative time_next_round;
1677 struct AttackedPeer *tmp_att_peer;
1679 LOG (GNUNET_ERROR_TYPE_DEBUG,
1680 "Going to execute next round maliciously type %" PRIu32 ".\n",
1682 do_round_task = NULL;
1683 GNUNET_assert (mal_type <= 3);
1684 /* Do malicious actions */
1686 { /* Try to maximise representation */
1688 /* The maximum of pushes we're going to send this round */
1689 num_pushes = GNUNET_MIN (GNUNET_MIN (push_limit,
1690 num_attacked_peers),
1691 GNUNET_CONSTANTS_MAX_CADET_MESSAGE_SIZE);
1693 LOG (GNUNET_ERROR_TYPE_DEBUG,
1694 "Going to send %" PRIu32 " pushes\n",
1697 /* Send PUSHes to attacked peers */
1698 for (i = 0 ; i < num_pushes ; i++)
1700 if (att_peers_tail == att_peer_index)
1701 att_peer_index = att_peers_head;
1703 att_peer_index = att_peer_index->next;
1705 send_push (&att_peer_index->peer_id);
1708 /* Send PULLs to some peers to learn about additional peers to attack */
1709 tmp_att_peer = att_peer_index;
1710 for (i = 0 ; i < num_pushes * alpha ; i++)
1712 if (att_peers_tail == tmp_att_peer)
1713 tmp_att_peer = att_peers_head;
1715 att_peer_index = tmp_att_peer->next;
1717 send_pull_request (&tmp_att_peer->peer_id);
1722 else if (2 == mal_type)
1724 * Try to partition the network
1725 * Send as many pushes to the attacked peer as possible
1726 * That is one push per round as it will ignore more.
1728 Peers_check_peer_live (&attacked_peer);
1729 if (GNUNET_YES == Peers_check_peer_valid (&attacked_peer))
1730 send_push (&attacked_peer);
1735 { /* Combined attack */
1737 /* Send PUSH to attacked peers */
1738 if (GNUNET_YES == Peers_check_peer_known (&attacked_peer))
1740 Peers_check_peer_live (&attacked_peer);
1741 if (GNUNET_YES == Peers_check_peer_valid (&attacked_peer))
1743 LOG (GNUNET_ERROR_TYPE_DEBUG,
1744 "Goding to send push to attacked peer (%s)\n",
1745 GNUNET_i2s (&attacked_peer));
1746 send_push (&attacked_peer);
1749 Peers_issue_peer_liveliness_check (&attacked_peer);
1752 Peers_check_peer_live (&attacked_peer);
1753 Peers_issue_peer_liveliness_check (&attacked_peer);
1755 /* The maximum of pushes we're going to send this round */
1756 num_pushes = GNUNET_MIN (GNUNET_MIN (push_limit - 1,
1757 num_attacked_peers),
1758 GNUNET_CONSTANTS_MAX_CADET_MESSAGE_SIZE);
1760 LOG (GNUNET_ERROR_TYPE_DEBUG,
1761 "Going to send %" PRIu32 " pushes\n",
1764 for (i = 0; i < num_pushes; i++)
1766 if (att_peers_tail == att_peer_index)
1767 att_peer_index = att_peers_head;
1769 att_peer_index = att_peer_index->next;
1771 send_push (&att_peer_index->peer_id);
1774 /* Send PULLs to some peers to learn about additional peers to attack */
1775 tmp_att_peer = att_peer_index;
1776 for (i = 0; i < num_pushes * alpha; i++)
1778 if (att_peers_tail == tmp_att_peer)
1779 tmp_att_peer = att_peers_head;
1781 att_peer_index = tmp_att_peer->next;
1783 send_pull_request (&tmp_att_peer->peer_id);
1787 /* Schedule next round */
1788 time_next_round = compute_rand_delay (round_interval, 2);
1790 //do_round_task = GNUNET_SCHEDULER_add_delayed (round_interval, &do_mal_round,
1792 GNUNET_assert (NULL == do_round_task);
1793 do_round_task = GNUNET_SCHEDULER_add_delayed (time_next_round,
1794 &do_mal_round, NULL);
1795 LOG (GNUNET_ERROR_TYPE_DEBUG, "Finished round\n");
1797 #endif /* ENABLE_MALICIOUS */
1801 * Send out PUSHes and PULLs, possibly update #view, samplers.
1803 * This is executed regylary.
1806 do_round (void *cls)
1809 const struct GNUNET_PeerIdentity *view_array;
1810 unsigned int *permut;
1811 unsigned int a_peers; /* Number of peers we send pushes to */
1812 unsigned int b_peers; /* Number of peers we send pull requests to */
1813 uint32_t first_border;
1814 uint32_t second_border;
1815 struct GNUNET_PeerIdentity peer;
1816 struct GNUNET_PeerIdentity *update_peer;
1818 LOG (GNUNET_ERROR_TYPE_DEBUG,
1819 "Going to execute next round.\n");
1820 do_round_task = NULL;
1821 LOG (GNUNET_ERROR_TYPE_DEBUG,
1822 "Printing view:\n");
1823 to_file (file_name_view_log,
1824 "___ new round ___");
1825 view_array = View_get_as_array ();
1826 for (i = 0; i < View_size (); i++)
1828 LOG (GNUNET_ERROR_TYPE_DEBUG,
1829 "\t%s\n", GNUNET_i2s (&view_array[i]));
1830 to_file (file_name_view_log,
1832 GNUNET_i2s_full (&view_array[i]));
1836 /* Send pushes and pull requests */
1837 if (0 < View_size ())
1839 permut = GNUNET_CRYPTO_random_permute (GNUNET_CRYPTO_QUALITY_STRONG,
1843 a_peers = ceil (alpha * View_size ());
1845 LOG (GNUNET_ERROR_TYPE_DEBUG,
1846 "Going to send pushes to %u (ceil (%f * %u)) peers.\n",
1847 a_peers, alpha, View_size ());
1848 for (i = 0; i < a_peers; i++)
1850 peer = view_array[permut[i]];
1851 if (0 != GNUNET_CRYPTO_cmp_peer_identity (&own_identity, &peer)) // TODO
1852 { // FIXME if this fails schedule/loop this for later
1857 /* Send PULL requests */
1858 b_peers = ceil (beta * View_size ());
1859 first_border = a_peers;
1860 second_border = a_peers + b_peers;
1861 if (second_border > View_size ())
1863 first_border = View_size () - b_peers;
1864 second_border = View_size ();
1866 LOG (GNUNET_ERROR_TYPE_DEBUG,
1867 "Going to send pulls to %u (ceil (%f * %u)) peers.\n",
1868 b_peers, beta, View_size ());
1869 for (i = first_border; i < second_border; i++)
1871 peer = view_array[permut[i]];
1872 if (0 != GNUNET_CRYPTO_cmp_peer_identity (&own_identity, &peer) &&
1873 GNUNET_NO == Peers_check_peer_flag (&peer, Peers_PULL_REPLY_PENDING)) // TODO
1874 { // FIXME if this fails schedule/loop this for later
1875 send_pull_request (&peer);
1879 GNUNET_free (permut);
1885 /* TODO see how many peers are in push-/pull- list! */
1887 if ((CustomPeerMap_size (push_map) <= alpha * View_size ()) &&
1888 (0 < CustomPeerMap_size (push_map)) &&
1889 (0 < CustomPeerMap_size (pull_map)))
1890 { /* If conditions for update are fulfilled, update */
1891 LOG (GNUNET_ERROR_TYPE_DEBUG, "Update of the view.\n");
1893 uint32_t final_size;
1894 uint32_t peers_to_clean_size;
1895 struct GNUNET_PeerIdentity *peers_to_clean;
1897 peers_to_clean = NULL;
1898 peers_to_clean_size = 0;
1899 GNUNET_array_grow (peers_to_clean, peers_to_clean_size, View_size ());
1900 memcpy (peers_to_clean,
1902 View_size () * sizeof (struct GNUNET_PeerIdentity));
1904 /* Seems like recreating is the easiest way of emptying the peermap */
1906 to_file (file_name_view_log,
1909 first_border = GNUNET_MIN (ceil (alpha * sampler_size_est_need),
1910 CustomPeerMap_size (push_map));
1911 second_border = first_border +
1912 GNUNET_MIN (floor (beta * sampler_size_est_need),
1913 CustomPeerMap_size (pull_map));
1914 final_size = second_border +
1915 ceil ((1 - (alpha + beta)) * sampler_size_est_need);
1917 /* Update view with peers received through PUSHes */
1918 permut = GNUNET_CRYPTO_random_permute (GNUNET_CRYPTO_QUALITY_STRONG,
1919 CustomPeerMap_size (push_map));
1920 for (i = 0; i < first_border; i++)
1922 (void) insert_in_view (CustomPeerMap_get_peer_by_index (push_map,
1924 to_file (file_name_view_log,
1926 GNUNET_i2s_full (&view_array[i]));
1927 // TODO change the peer_flags accordingly
1929 GNUNET_free (permut);
1932 /* Update view with peers received through PULLs */
1933 permut = GNUNET_CRYPTO_random_permute (GNUNET_CRYPTO_QUALITY_STRONG,
1934 CustomPeerMap_size (pull_map));
1935 for (i = first_border; i < second_border; i++)
1937 (void) insert_in_view (CustomPeerMap_get_peer_by_index (pull_map,
1938 permut[i - first_border]));
1939 to_file (file_name_view_log,
1941 GNUNET_i2s_full (&view_array[i]));
1942 // TODO change the peer_flags accordingly
1944 GNUNET_free (permut);
1947 /* Update view with peers from history */
1948 RPS_sampler_get_n_rand_peers (prot_sampler,
1951 final_size - second_border);
1952 // TODO change the peer_flags accordingly
1954 for (i = 0; i < View_size (); i++)
1955 rem_from_list (&peers_to_clean, &peers_to_clean_size, &view_array[i]);
1957 /* Clean peers that were removed from the view */
1958 for (i = 0; i < peers_to_clean_size; i++)
1960 to_file (file_name_view_log,
1962 GNUNET_i2s_full (&peers_to_clean[i]));
1963 Peers_clean_peer (&peers_to_clean[i]);
1964 //peer_destroy_channel_send (sender);
1967 GNUNET_array_grow (peers_to_clean, peers_to_clean_size, 0);
1968 peers_to_clean = NULL;
1972 LOG (GNUNET_ERROR_TYPE_DEBUG, "No update of the view.\n");
1974 // TODO independent of that also get some peers from CADET_get_peers()?
1976 LOG (GNUNET_ERROR_TYPE_DEBUG,
1977 "Received %u pushes and %u pulls last round (alpha (%.2f) * view_size (%u) = %.2f)\n",
1978 CustomPeerMap_size (push_map),
1979 CustomPeerMap_size (pull_map),
1982 alpha * View_size ());
1984 /* Update samplers */
1985 for (i = 0; i < CustomPeerMap_size (push_map); i++)
1987 update_peer = CustomPeerMap_get_peer_by_index (push_map, i);
1988 LOG (GNUNET_ERROR_TYPE_DEBUG,
1989 "Updating with peer %s from push list\n",
1990 GNUNET_i2s (update_peer));
1991 insert_in_sampler (NULL, update_peer);
1992 Peers_clean_peer (update_peer); /* This cleans only if it is not in the view */
1993 //peer_destroy_channel_send (sender);
1996 for (i = 0; i < CustomPeerMap_size (pull_map); i++)
1998 LOG (GNUNET_ERROR_TYPE_DEBUG,
1999 "Updating with peer %s from pull list\n",
2000 GNUNET_i2s (CustomPeerMap_get_peer_by_index (pull_map, i)));
2001 insert_in_sampler (NULL, CustomPeerMap_get_peer_by_index (pull_map, i));
2002 /* This cleans only if it is not in the view */
2003 Peers_clean_peer (CustomPeerMap_get_peer_by_index (pull_map, i));
2004 //peer_destroy_channel_send (sender);
2008 /* Empty push/pull lists */
2009 CustomPeerMap_clear (push_map);
2010 CustomPeerMap_clear (pull_map);
2012 struct GNUNET_TIME_Relative time_next_round;
2014 time_next_round = compute_rand_delay (round_interval, 2);
2016 /* Schedule next round */
2017 do_round_task = GNUNET_SCHEDULER_add_delayed (time_next_round,
2019 LOG (GNUNET_ERROR_TYPE_DEBUG, "Finished round\n");
2024 rps_start (struct GNUNET_SERVER_Handle *server);
2028 * This is called from GNUNET_CADET_get_peers().
2030 * It is called on every peer(ID) that cadet somehow has contact with.
2031 * We use those to initialise the sampler.
2034 init_peer_cb (void *cls,
2035 const struct GNUNET_PeerIdentity *peer,
2036 int tunnel, // "Do we have a tunnel towards this peer?"
2037 unsigned int n_paths, // "Number of known paths towards this peer"
2038 unsigned int best_path) // "How long is the best path?
2039 // (0 = unknown, 1 = ourselves, 2 = neighbor)"
2043 LOG (GNUNET_ERROR_TYPE_DEBUG,
2044 "Got peer_id %s from cadet\n",
2051 * @brief Iterator function over stored, valid peers.
2053 * We initialise the sampler with those.
2055 * @param cls the closure
2056 * @param peer the peer id
2057 * @return #GNUNET_YES if we should continue to
2059 * #GNUNET_NO if not.
2062 valid_peers_iterator (void *cls,
2063 const struct GNUNET_PeerIdentity *peer)
2067 LOG (GNUNET_ERROR_TYPE_DEBUG,
2068 "Got stored, valid peer %s\n",
2077 * Iterator over peers from peerinfo.
2079 * @param cls closure
2080 * @param peer id of the peer, NULL for last call
2081 * @param hello hello message for the peer (can be NULL)
2082 * @param error message
2085 process_peerinfo_peers (void *cls,
2086 const struct GNUNET_PeerIdentity *peer,
2087 const struct GNUNET_HELLO_Message *hello,
2088 const char *err_msg)
2092 LOG (GNUNET_ERROR_TYPE_DEBUG,
2093 "Got peer_id %s from peerinfo\n",
2101 * Task run during shutdown.
2106 shutdown_task (void *cls)
2108 LOG (GNUNET_ERROR_TYPE_DEBUG,
2109 "RPS is going down\n");
2110 GNUNET_PEERINFO_notify_cancel (peerinfo_notify_handle);
2111 GNUNET_PEERINFO_disconnect (peerinfo_handle);
2113 if (NULL != do_round_task)
2115 GNUNET_SCHEDULER_cancel (do_round_task);
2116 do_round_task = NULL;
2121 GNUNET_NSE_disconnect (nse);
2122 RPS_sampler_destroy (prot_sampler);
2123 RPS_sampler_destroy (client_sampler);
2124 GNUNET_CADET_disconnect (cadet_handle);
2126 CustomPeerMap_destroy (push_map);
2127 CustomPeerMap_destroy (pull_map);
2128 #ifdef ENABLE_MALICIOUS
2129 struct AttackedPeer *tmp_att_peer;
2130 GNUNET_free (file_name_view_log);
2131 GNUNET_array_grow (mal_peers, num_mal_peers, 0);
2132 if (NULL != mal_peer_set)
2133 GNUNET_CONTAINER_multipeermap_destroy (mal_peer_set);
2134 if (NULL != att_peer_set)
2135 GNUNET_CONTAINER_multipeermap_destroy (att_peer_set);
2136 while (NULL != att_peers_head)
2138 tmp_att_peer = att_peers_head;
2139 GNUNET_CONTAINER_DLL_remove (att_peers_head, att_peers_tail, tmp_att_peer);
2141 #endif /* ENABLE_MALICIOUS */
2146 * @brief Get informed about a connecting client.
2149 * @param client the client that connects
2152 handle_client_connect (void *cls,
2153 struct GNUNET_SERVER_Client *client)
2155 struct ClientContext *cli_ctx;
2157 LOG (GNUNET_ERROR_TYPE_DEBUG,
2158 "Client connected\n");
2160 return; /* Server was destroyed before a client connected. Shutting down */
2161 cli_ctx = GNUNET_new (struct ClientContext);
2162 cli_ctx->mq = GNUNET_MQ_queue_for_server_client (client);
2163 GNUNET_SERVER_client_set_user_context (client, cli_ctx);
2164 GNUNET_CONTAINER_DLL_insert (cli_ctx_head,
2170 * A client disconnected. Remove all of its data structure entries.
2172 * @param cls closure, NULL
2173 * @param client identification of the client
2176 handle_client_disconnect (void *cls,
2177 struct GNUNET_SERVER_Client *client)
2179 struct ClientContext *cli_ctx;
2182 {/* shutdown task */
2183 while (NULL != cli_ctx_head)
2184 destroy_cli_ctx (cli_ctx_head);
2188 cli_ctx = GNUNET_SERVER_client_get_user_context (client, struct ClientContext);
2189 destroy_cli_ctx (cli_ctx);
2195 * Actually start the service.
2198 rps_start (struct GNUNET_SERVER_Handle *server)
2200 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
2201 {&handle_client_request, NULL, GNUNET_MESSAGE_TYPE_RPS_CS_REQUEST,
2202 sizeof (struct GNUNET_RPS_CS_RequestMessage)},
2203 {&handle_client_request_cancel, NULL, GNUNET_MESSAGE_TYPE_RPS_CS_REQUEST_CANCEL,
2204 sizeof (struct GNUNET_RPS_CS_RequestCancelMessage)},
2205 {&handle_client_seed, NULL, GNUNET_MESSAGE_TYPE_RPS_CS_SEED, 0},
2206 #ifdef ENABLE_MALICIOUS
2207 {&handle_client_act_malicious, NULL, GNUNET_MESSAGE_TYPE_RPS_ACT_MALICIOUS , 0},
2208 #endif /* ENABLE_MALICIOUS */
2212 GNUNET_SERVER_add_handlers (server, handlers);
2213 GNUNET_SERVER_connect_notify (server,
2214 &handle_client_connect,
2216 GNUNET_SERVER_disconnect_notify (server,
2217 &handle_client_disconnect,
2219 LOG (GNUNET_ERROR_TYPE_INFO, "Ready to receive requests from clients\n");
2222 do_round_task = GNUNET_SCHEDULER_add_now (&do_round, NULL);
2223 LOG (GNUNET_ERROR_TYPE_DEBUG, "Scheduled first round\n");
2225 GNUNET_SCHEDULER_add_shutdown (&shutdown_task,
2231 * Process statistics requests.
2233 * @param cls closure
2234 * @param server the initialized server
2235 * @param c configuration to use
2239 struct GNUNET_SERVER_Handle *server,
2240 const struct GNUNET_CONFIGURATION_Handle *c)
2244 char* fn_valid_peers;
2246 GNUNET_log_setup ("rps", GNUNET_error_type_to_string (GNUNET_ERROR_TYPE_DEBUG), NULL);
2251 GNUNET_CRYPTO_get_peer_identity (cfg, &own_identity); // TODO check return value
2252 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2253 "STARTING SERVICE (rps) for peer [%s]\n",
2254 GNUNET_i2s (&own_identity));
2255 #ifdef ENABLE_MALICIOUS
2256 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2257 "Malicious execution compiled in.\n");
2258 #endif /* ENABLE_MALICIOUS */
2262 /* Get time interval from the configuration */
2263 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_time (cfg, "RPS",
2267 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
2268 "RPS", "ROUNDINTERVAL");
2269 GNUNET_SCHEDULER_shutdown ();
2273 /* Get initial size of sampler/view from the configuration */
2275 GNUNET_CONFIGURATION_get_value_number (cfg, "RPS", "INITSIZE",
2276 (long long unsigned int *) &sampler_size_est_need))
2278 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
2280 GNUNET_SCHEDULER_shutdown ();
2283 LOG (GNUNET_ERROR_TYPE_DEBUG, "INITSIZE is %u\n", sampler_size_est_need);
2286 GNUNET_CONFIGURATION_get_value_filename (cfg,
2288 "FILENAME_VALID_PEERS",
2291 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
2292 "rps", "FILENAME_VALID_PEERS");
2298 /* file_name_view_log */
2299 if (GNUNET_OK != GNUNET_DISK_directory_create ("/tmp/rps/"))
2301 LOG (GNUNET_ERROR_TYPE_WARNING,
2302 "Failed to create directory /tmp/rps/\n");
2305 size = (14 + strlen (GNUNET_i2s_full (&own_identity)) + 1) * sizeof (char);
2306 file_name_view_log = GNUNET_malloc (size);
2307 out_size = GNUNET_snprintf (file_name_view_log,
2310 GNUNET_i2s_full (&own_identity));
2311 if (size < out_size ||
2314 LOG (GNUNET_ERROR_TYPE_WARNING,
2315 "Failed to write string to buffer (size: %i, out_size: %i)\n",
2321 /* connect to NSE */
2322 nse = GNUNET_NSE_connect (cfg, nse_callback, NULL);
2329 /* Initialise cadet */
2330 static const struct GNUNET_CADET_MessageHandler cadet_handlers[] = {
2331 {&handle_peer_push , GNUNET_MESSAGE_TYPE_RPS_PP_PUSH ,
2332 sizeof (struct GNUNET_MessageHeader)},
2333 {&handle_peer_pull_request, GNUNET_MESSAGE_TYPE_RPS_PP_PULL_REQUEST,
2334 sizeof (struct GNUNET_MessageHeader)},
2335 {&handle_peer_pull_reply , GNUNET_MESSAGE_TYPE_RPS_PP_PULL_REPLY , 0},
2338 const uint32_t ports[] = {GNUNET_RPS_CADET_PORT, 0}; // _PORT specified in src/rps/rps.h
2339 cadet_handle = GNUNET_CADET_connect (cfg,
2341 &Peers_handle_inbound_channel,
2342 &cleanup_destroyed_channel,
2346 peerinfo_handle = GNUNET_PEERINFO_connect (cfg);
2347 Peers_initialise (fn_valid_peers, cadet_handle, &own_identity);
2348 GNUNET_free (fn_valid_peers);
2350 /* Initialise sampler */
2351 struct GNUNET_TIME_Relative half_round_interval;
2352 struct GNUNET_TIME_Relative max_round_interval;
2354 half_round_interval = GNUNET_TIME_relative_multiply (round_interval, .5);
2355 max_round_interval = GNUNET_TIME_relative_add (round_interval, half_round_interval);
2357 prot_sampler = RPS_sampler_init (sampler_size_est_need, max_round_interval);
2358 client_sampler = RPS_sampler_mod_init (sampler_size_est_need, max_round_interval);
2360 /* Initialise push and pull maps */
2361 push_map = CustomPeerMap_create (4);
2362 pull_map = CustomPeerMap_create (4);
2365 LOG (GNUNET_ERROR_TYPE_DEBUG, "Requesting peers from CADET\n");
2366 GNUNET_CADET_get_peers (cadet_handle, &init_peer_cb, NULL);
2367 // TODO send push/pull to each of those peers?
2368 // TODO read stored valid peers from last run
2369 LOG (GNUNET_ERROR_TYPE_DEBUG, "Requesting stored valid peers\n");
2370 Peers_get_valid_peers (valid_peers_iterator, NULL);
2372 peerinfo_notify_handle = GNUNET_PEERINFO_notify (cfg,
2374 process_peerinfo_peers,
2382 * The main function for the rps service.
2384 * @param argc number of arguments from the command line
2385 * @param argv command line arguments
2386 * @return 0 ok, 1 on error
2389 main (int argc, char *const *argv)
2391 return (GNUNET_OK ==
2392 GNUNET_SERVICE_run (argc,
2395 GNUNET_SERVICE_OPTION_NONE,
2396 &run, NULL)) ? 0 : 1;
2399 /* end of gnunet-service-rps.c */