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3 (C) 2010,2011,2012 Christian Grothoff (and other contributing authors)
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22 * @file transport/gnunet-service-transport_neighbours.c
23 * @brief neighbour management
24 * @author Christian Grothoff
27 * - "address_change_cb" is NEVER invoked; when should we call this one exactly?
28 * - TEST, TEST, TEST...
31 #include "gnunet_ats_service.h"
32 #include "gnunet-service-transport_neighbours.h"
33 #include "gnunet-service-transport_plugins.h"
34 #include "gnunet-service-transport_validation.h"
35 #include "gnunet-service-transport_clients.h"
36 #include "gnunet-service-transport.h"
37 #include "gnunet_peerinfo_service.h"
38 #include "gnunet-service-transport_blacklist.h"
39 #include "gnunet_constants.h"
40 #include "transport.h"
44 * Size of the neighbour hash map.
46 #define NEIGHBOUR_TABLE_SIZE 256
49 * Time we give plugin to transmit DISCONNECT message before the
50 * neighbour entry self-destructs.
52 #define DISCONNECT_SENT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 100)
55 * How often must a peer violate bandwidth quotas before we start
56 * to simply drop its messages?
58 #define QUOTA_VIOLATION_DROP_THRESHOLD 10
61 * How often do we send KEEPALIVE messages to each of our neighbours and measure
62 * the latency with this neighbour?
63 * (idle timeout is 5 minutes or 300 seconds, so with 30s interval we
64 * send 10 keepalives in each interval, so 10 messages would need to be
65 * lost in a row for a disconnect).
67 #define KEEPALIVE_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
70 * How long are we willing to wait for a response from ATS before timing out?
72 #define ATS_RESPONSE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 500)
75 * How long are we willing to wait for an ACK from the other peer before
76 * giving up on our connect operation?
78 #define SETUP_CONNECTION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
81 * How long are we willing to wait for a successful reconnect if
82 * an existing connection went down? Much shorter than the
83 * usual SETUP_CONNECTION_TIMEOUT as we do not inform the
84 * higher layers about the disconnect during this period.
86 #define FAST_RECONNECT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1)
89 * How long are we willing to wait for a response from the blacklist
90 * subsystem before timing out?
92 #define BLACKLIST_RESPONSE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 500)
95 GNUNET_NETWORK_STRUCT_BEGIN
98 * Message a peer sends to another to indicate that it intends to
99 * setup a connection/session for data exchange. A 'SESSION_CONNECT'
100 * should be answered with a 'SESSION_CONNECT_ACK' with the same body
101 * to confirm. A 'SESSION_CONNECT_ACK' should then be followed with
102 * a 'SESSION_ACK'. Once the 'SESSION_ACK' is received, both peers
103 * should be connected.
105 struct SessionConnectMessage
108 * Header of type 'GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT'
109 * or 'GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT_ACK'
111 struct GNUNET_MessageHeader header;
116 uint32_t reserved GNUNET_PACKED;
119 * Absolute time at the sender. Only the most recent connect
120 * message implies which session is preferred by the sender.
122 struct GNUNET_TIME_AbsoluteNBO timestamp;
128 * Message we send to the other peer to notify him that we intentionally
129 * are disconnecting (to reduce timeouts). This is just a friendly
130 * notification, peers must not rely on always receiving disconnect
133 struct SessionDisconnectMessage
136 * Header of type 'GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT'
138 struct GNUNET_MessageHeader header;
143 uint32_t reserved GNUNET_PACKED;
146 * Purpose of the signature. Extends over the timestamp.
147 * Purpose should be GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DISCONNECT.
149 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
152 * Absolute time at the sender. Only the most recent connect
153 * message implies which session is preferred by the sender.
155 struct GNUNET_TIME_AbsoluteNBO timestamp;
158 * Public key of the sender.
160 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded public_key;
163 * Signature of the peer that sends us the disconnect. Only
164 * valid if the timestamp is AFTER the timestamp from the
165 * corresponding 'CONNECT' message.
167 struct GNUNET_CRYPTO_RsaSignature signature;
171 GNUNET_NETWORK_STRUCT_END
175 * For each neighbour we keep a list of messages
176 * that we still want to transmit to the neighbour.
182 * This is a doubly linked list.
184 struct MessageQueue *next;
187 * This is a doubly linked list.
189 struct MessageQueue *prev;
192 * Function to call once we're done.
194 GST_NeighbourSendContinuation cont;
202 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
203 * stuck together in memory. Allocated at the end of this struct.
205 const char *message_buf;
208 * Size of the message buf
210 size_t message_buf_size;
213 * At what time should we fail?
215 struct GNUNET_TIME_Absolute timeout;
221 * Possible state of a neighbour. Initially, we are S_NOT_CONNECTED.
223 * Then, there are two main paths. If we receive a CONNECT message, we
224 * first run a check against the blacklist and ask ATS for a
225 * suggestion. (S_CONNECT_RECV_ATS). If the blacklist comes back
226 * positive, we give the address to ATS. If ATS makes a suggestion,
227 * we ALSO give that suggestion to the blacklist
228 * (S_CONNECT_RECV_BLACKLIST). Once the blacklist approves the
229 * address we got from ATS, we send our CONNECT_ACK and go to
230 * S_CONNECT_RECV_ACK. If we receive a SESSION_ACK, we go to
231 * S_CONNECTED (and notify everyone about the new connection). If the
232 * operation times out, we go to S_DISCONNECT.
234 * The other case is where we transmit a CONNECT message first. We
235 * start with S_INIT_ATS. If we get an address, we enter
236 * S_INIT_BLACKLIST and check the blacklist. If the blacklist is OK
237 * with the connection, we actually send the CONNECT message and go to
238 * state S_CONNECT_SENT. Once we receive a CONNECT_ACK, we go to
239 * S_CONNECTED (and notify everyone about the new connection and send
240 * back a SESSION_ACK). If the operation times out, we go to
243 * If the session is in trouble (i.e. transport-level disconnect or
244 * timeout), we go to S_RECONNECT_ATS where we ask ATS for a new
245 * address (we don't notify anyone about the disconnect yet). Once we
246 * have a new address, we go to S_RECONNECT_BLACKLIST to check the new
247 * address against the blacklist. If the blacklist approves, we enter
248 * S_RECONNECT_SENT and send a CONNECT message. If we receive a
249 * CONNECT_ACK, we go to S_CONNECTED and nobody noticed that we had
250 * trouble; we also send a SESSION_ACK at this time just in case. If
251 * the operation times out, we go to S_DISCONNECT (and notify everyone
252 * about the lost connection).
254 * If ATS decides to switch addresses while we have a normal
255 * connection, we go to S_CONNECTED_SWITCHING_BLACKLIST to check the
256 * new address against the blacklist. If the blacklist approves, we
257 * go to S_CONNECTED_SWITCHING_CONNECT_SENT and send a
258 * SESSION_CONNECT. If we get a SESSION_ACK back, we switch the
259 * primary connection to the suggested alternative from ATS, go back
260 * to S_CONNECTED and send a SESSION_ACK to the other peer just to be
261 * sure. If the operation times out (or the blacklist disapproves),
262 * we go to S_CONNECTED (and notify ATS that the given alternative
263 * address is "invalid").
265 * Once a session is in S_DISCONNECT, it is cleaned up and then goes
266 * to (S_DISCONNECT_FINISHED). If we receive an explicit disconnect
267 * request, we can go from any state to S_DISCONNECT, possibly after
268 * generating disconnect notifications.
270 * Note that it is quite possible that while we are in any of these
271 * states, we could receive a 'CONNECT' request from the other peer.
272 * We then enter a 'weird' state where we pursue our own primary state
273 * machine (as described above), but with the 'send_connect_ack' flag
274 * set to 1. If our state machine allows us to send a 'CONNECT_ACK'
275 * (because we have an acceptable address), we send the 'CONNECT_ACK'
276 * and set the 'send_connect_ack' to 2. If we then receive a
277 * 'SESSION_ACK', we go to 'S_CONNECTED' (and reset 'send_connect_ack'
284 * fresh peer or completely disconnected
289 * Asked to initiate connection, trying to get address from ATS
294 * Asked to initiate connection, trying to get address approved
300 * Sent CONNECT message to other peer, waiting for CONNECT_ACK
305 * Received a CONNECT, asking ATS about address suggestions.
310 * Received CONNECT from other peer, got an address, checking with blacklist.
312 S_CONNECT_RECV_BLACKLIST,
315 * CONNECT request from other peer was SESSION_ACK'ed, waiting for
321 * Got our CONNECT_ACK/SESSION_ACK, connection is up.
326 * Connection got into trouble, rest of the system still believes
327 * it to be up, but we're getting a new address from ATS.
332 * Connection got into trouble, rest of the system still believes
333 * it to be up; we are checking the new address against the blacklist.
335 S_RECONNECT_BLACKLIST,
338 * Sent CONNECT over new address (either by ATS telling us to switch
339 * addresses or from RECONNECT_ATS); if this fails, we need to tell
340 * the rest of the system about a disconnect.
345 * We have some primary connection, but ATS suggested we switch
346 * to some alternative; we're now checking the alternative against
349 S_CONNECTED_SWITCHING_BLACKLIST,
352 * We have some primary connection, but ATS suggested we switch
353 * to some alternative; we now sent a CONNECT message for the
354 * alternative session to the other peer and waiting for a
355 * CONNECT_ACK to make this our primary connection.
357 S_CONNECTED_SWITCHING_CONNECT_SENT,
360 * Disconnect in progress (we're sending the DISCONNECT message to the
361 * other peer; after that is finished, the state will be cleaned up).
366 * We're finished with the disconnect; clean up state now!
368 S_DISCONNECT_FINISHED
373 * A possible address we could use to communicate with a neighbour.
375 struct NeighbourAddress
379 * Active session for this address.
381 struct Session *session;
384 * Network-level address information.
386 struct GNUNET_HELLO_Address *address;
389 * Timestamp of the 'SESSION_CONNECT' message we sent to the other
390 * peer for this address. Use to check that the ACK is in response
391 * to our most recent 'CONNECT'.
393 struct GNUNET_TIME_Absolute connect_timestamp;
396 * Inbound bandwidth from ATS for this address.
398 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in;
401 * Outbound bandwidth from ATS for this address.
403 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out;
406 * Did we tell ATS that this is our 'active' address?
414 * Entry in neighbours.
416 struct NeighbourMapEntry
420 * Head of list of messages we would like to send to this peer;
421 * must contain at most one message per client.
423 struct MessageQueue *messages_head;
426 * Tail of list of messages we would like to send to this peer; must
427 * contain at most one message per client.
429 struct MessageQueue *messages_tail;
432 * Are we currently trying to send a message? If so, which one?
434 struct MessageQueue *is_active;
437 * Primary address we currently use to communicate with the neighbour.
439 struct NeighbourAddress primary_address;
442 * Alternative address currently under consideration for communicating
443 * with the neighbour.
445 struct NeighbourAddress alternative_address;
448 * Identity of this neighbour.
450 struct GNUNET_PeerIdentity id;
453 * Main task that drives this peer (timeouts, keepalives, etc.).
454 * Always runs the 'master_task'.
456 GNUNET_SCHEDULER_TaskIdentifier task;
459 * At what time should we sent the next keep-alive message?
461 struct GNUNET_TIME_Absolute keep_alive_time;
464 * At what time did we sent the last keep-alive message? Used
465 * to calculate round-trip time ("latency").
467 struct GNUNET_TIME_Absolute last_keep_alive_time;
470 * Timestamp we should include in our next CONNECT_ACK message.
471 * (only valid if 'send_connect_ack' is GNUNET_YES). Used to build
472 * our CONNECT_ACK message.
474 struct GNUNET_TIME_Absolute connect_ack_timestamp;
477 * Time where we should cut the connection (timeout) if we don't
478 * make progress in the state machine (or get a KEEPALIVE_RESPONSE
479 * if we are in S_CONNECTED).
481 struct GNUNET_TIME_Absolute timeout;
484 * Latest calculated latency value
486 struct GNUNET_TIME_Relative latency;
489 * Tracker for inbound bandwidth.
491 struct GNUNET_BANDWIDTH_Tracker in_tracker;
494 * How often has the other peer (recently) violated the inbound
495 * traffic limit? Incremented by 10 per violation, decremented by 1
496 * per non-violation (for each time interval).
498 unsigned int quota_violation_count;
501 * The current state of the peer.
506 * Did we sent an KEEP_ALIVE message and are we expecting a response?
508 int expect_latency_response;
511 * Flag to set if we still need to send a CONNECT_ACK message to the other peer
512 * (once we have an address to use and the peer has been allowed by our
513 * blacklist). Set to 1 if we need to send a CONNECT_ACK. Set to 2 if we
514 * did send a CONNECT_ACK and should go to 'S_CONNECTED' upon receiving
515 * a 'SESSION_ACK' (regardless of what our own state machine might say).
517 int send_connect_ack;
523 * Context for blacklist checks and the 'handle_test_blacklist_cont'
524 * function. Stores information about ongoing blacklist checks.
526 struct BlackListCheckContext
530 * We keep blacklist checks in a DLL.
532 struct BlackListCheckContext *next;
535 * We keep blacklist checks in a DLL.
537 struct BlackListCheckContext *prev;
540 * Address that is being checked.
542 struct NeighbourAddress na;
545 * ATS information about the address.
547 struct GNUNET_ATS_Information *ats;
550 * Handle to the ongoing blacklist check.
552 struct GST_BlacklistCheck *bc;
555 * Size of the 'ats' array.
563 * Hash map from peer identities to the respective 'struct NeighbourMapEntry'.
565 static struct GNUNET_CONTAINER_MultiHashMap *neighbours;
568 * We keep blacklist checks in a DLL so that we can find
569 * the 'sessions' in their 'struct NeighbourAddress' if
570 * a session goes down.
572 static struct BlackListCheckContext *bc_head;
575 * We keep blacklist checks in a DLL.
577 static struct BlackListCheckContext *bc_tail;
580 * Closure for connect_notify_cb, disconnect_notify_cb and address_change_cb
582 static void *callback_cls;
585 * Function to call when we connected to a neighbour.
587 static GNUNET_TRANSPORT_NotifyConnect connect_notify_cb;
590 * Function to call when we disconnected from a neighbour.
592 static GNUNET_TRANSPORT_NotifyDisconnect disconnect_notify_cb;
595 * Function to call when we changed an active address of a neighbour.
597 static GNUNET_TRANSPORT_PeerIterateCallback address_change_cb;
600 * counter for connected neighbours
602 static unsigned int neighbours_connected;
605 * Number of bytes we have currently queued for transmission.
607 static unsigned long long bytes_in_send_queue;
611 * Lookup a neighbour entry in the neighbours hash map.
613 * @param pid identity of the peer to look up
614 * @return the entry, NULL if there is no existing record
616 static struct NeighbourMapEntry *
617 lookup_neighbour (const struct GNUNET_PeerIdentity *pid)
619 if (NULL == neighbours)
621 return GNUNET_CONTAINER_multihashmap_get (neighbours, &pid->hashPubKey);
625 print_state (int state)
630 case S_NOT_CONNECTED:
631 return "S_NOT_CONNECTED";
636 case S_INIT_BLACKLIST:
637 return "S_INIT_BLACKLIST";
640 return "S_CONNECT_SENT";
642 case S_CONNECT_RECV_ATS:
643 return "S_CONNECT_RECV_ATS";
645 case S_CONNECT_RECV_BLACKLIST:
646 return "S_CONNECT_RECV_BLACKLIST";
648 case S_CONNECT_RECV_ACK:
649 return "S_CONNECT_RECV_ACK";
652 return "S_CONNECTED";
654 case S_RECONNECT_ATS:
655 return "S_RECONNECT_ATS";
657 case S_RECONNECT_BLACKLIST:
658 return "S_RECONNECT_BLACKLIST";
660 case S_RECONNECT_SENT:
661 return "S_RECONNECT_SENT";
663 case S_CONNECTED_SWITCHING_BLACKLIST:
664 return "S_CONNECTED_SWITCHING_BLACKLIST";
666 case S_CONNECTED_SWITCHING_CONNECT_SENT:
667 return "S_CONNECTED_SWITCHING_CONNECT_SENT";
670 return "S_DISCONNECT";
672 case S_DISCONNECT_FINISHED:
673 return "S_DISCONNECT_FINISHED";
685 * Test if we're connected to the given peer.
687 * @param n neighbour entry of peer to test
688 * @return GNUNET_YES if we are connected, GNUNET_NO if not
691 test_connected (struct NeighbourMapEntry *n)
697 case S_NOT_CONNECTED:
699 case S_INIT_BLACKLIST:
701 case S_CONNECT_RECV_ATS:
702 case S_CONNECT_RECV_BLACKLIST:
703 case S_CONNECT_RECV_ACK:
706 case S_RECONNECT_ATS:
707 case S_RECONNECT_BLACKLIST:
708 case S_RECONNECT_SENT:
709 case S_CONNECTED_SWITCHING_BLACKLIST:
710 case S_CONNECTED_SWITCHING_CONNECT_SENT:
713 case S_DISCONNECT_FINISHED:
716 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
720 return GNUNET_SYSERR;
724 * Send information about a new outbound quota to our clients.
726 * @param target affected peer
727 * @param quota new quota
730 send_outbound_quota (const struct GNUNET_PeerIdentity *target,
731 struct GNUNET_BANDWIDTH_Value32NBO quota)
733 struct QuotaSetMessage q_msg;
735 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
736 "Sending outbound quota of %u Bps for peer `%s' to all clients\n",
737 ntohl (quota.value__), GNUNET_i2s (target));
738 q_msg.header.size = htons (sizeof (struct QuotaSetMessage));
739 q_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA);
741 q_msg.peer = (*target);
742 GST_clients_broadcast (&q_msg.header, GNUNET_NO);
747 * We don't need a given neighbour address any more.
748 * Release its resources and give appropriate notifications
749 * to ATS and other subsystems.
751 * @param na address we are done with; 'na' itself must NOT be 'free'd, only the contents!
754 free_address (struct NeighbourAddress *na)
756 if (GNUNET_YES == na->ats_active)
758 GST_validation_set_address_use (na->address, na->session, GNUNET_NO, __LINE__);
759 GNUNET_ATS_address_in_use (GST_ats, na->address, na->session, GNUNET_NO);
761 na->ats_active = GNUNET_NO;
762 if (NULL != na->address)
764 GNUNET_HELLO_address_free (na->address);
772 * Initialize the 'struct NeighbourAddress'.
774 * @param na neighbour address to initialize
775 * @param address address of the other peer, NULL if other peer
777 * @param session session to use (or NULL, in which case an
778 * address must be setup)
779 * @param bandwidth_in inbound quota to be used when connection is up
780 * @param bandwidth_out outbound quota to be used when connection is up
781 * @param is_active GNUNET_YES to mark this as the active address with ATS
784 set_address (struct NeighbourAddress *na,
785 const struct GNUNET_HELLO_Address *address,
786 struct Session *session,
787 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
788 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
791 struct GNUNET_TRANSPORT_PluginFunctions *papi;
793 if (NULL == (papi = GST_plugins_find (address->transport_name)))
798 if (session == na->session)
800 na->bandwidth_in = bandwidth_in;
801 na->bandwidth_out = bandwidth_out;
802 if (is_active != na->ats_active)
804 na->ats_active = is_active;
805 GNUNET_ATS_address_in_use (GST_ats, na->address, na->session, is_active);
806 GST_validation_set_address_use (na->address, na->session, is_active, __LINE__);
808 if (GNUNET_YES == is_active)
810 /* FIXME: is this the right place to set quotas? */
811 GST_neighbours_set_incoming_quota (&address->peer, bandwidth_in);
812 send_outbound_quota (&address->peer, bandwidth_out);
818 session = papi->get_session (papi->cls, address);
821 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
822 "Failed to obtain new session for peer `%s' and address '%s'\n",
823 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
824 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
827 na->address = GNUNET_HELLO_address_copy (address);
828 na->bandwidth_in = bandwidth_in;
829 na->bandwidth_out = bandwidth_out;
830 na->session = session;
831 na->ats_active = is_active;
832 if (GNUNET_YES == is_active)
834 /* Telling ATS about new session */
835 GNUNET_ATS_address_update (GST_ats, na->address, na->session, NULL, 0);
836 GNUNET_ATS_address_in_use (GST_ats, na->address, na->session, GNUNET_YES);
837 GST_validation_set_address_use (na->address, na->session, GNUNET_YES, __LINE__);
839 /* FIXME: is this the right place to set quotas? */
840 GST_neighbours_set_incoming_quota (&address->peer, bandwidth_in);
841 send_outbound_quota (&address->peer, bandwidth_out);
847 * Free a neighbour map entry.
849 * @param n entry to free
852 free_neighbour (struct NeighbourMapEntry *n)
854 struct MessageQueue *mq;
855 struct GNUNET_TRANSPORT_PluginFunctions *papi;
857 n->is_active = NULL; /* always free'd by its own continuation! */
859 /* fail messages currently in the queue */
860 while (NULL != (mq = n->messages_head))
862 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
863 if (NULL != mq->cont)
864 mq->cont (mq->cont_cls, GNUNET_SYSERR);
867 /* It is too late to send other peer disconnect notifications, but at
868 least internally we need to get clean... */
869 if (GNUNET_YES == test_connected (n))
871 GNUNET_STATISTICS_set (GST_stats,
872 gettext_noop ("# peers connected"),
873 --neighbours_connected,
875 disconnect_notify_cb (callback_cls, &n->id);
878 /* FIXME-PLUGIN-API: This does not seem to guarantee that all
879 transport sessions eventually get killed due to inactivity; they
880 MUST have their own timeout logic (but at least TCP doesn't have
881 one yet). Are we sure that EVERY 'session' of a plugin is
882 actually cleaned up this way!? Note that if we are switching
883 between two TCP sessions to the same peer, the existing plugin
884 API gives us not even the means to selectively kill only one of
885 them! Killing all sessions like this seems to be very, very
887 if ( (NULL != n->primary_address.address) &&
888 (NULL != (papi = GST_plugins_find (n->primary_address.address->transport_name))) )
889 papi->disconnect (papi->cls, &n->id);
891 n->state = S_DISCONNECT_FINISHED;
893 GNUNET_assert (GNUNET_YES ==
894 GNUNET_CONTAINER_multihashmap_remove (neighbours,
895 &n->id.hashPubKey, n));
897 /* cut transport-level connection */
898 free_address (&n->primary_address);
899 free_address (&n->alternative_address);
901 // FIXME-ATS-API: we might want to be more specific about
902 // which states we do this from in the future (ATS should
903 // have given us a 'suggest_address' handle, and if we have
904 // such a handle, we should cancel the operation here!
905 GNUNET_ATS_suggest_address_cancel (GST_ats, &n->id);
907 if (GNUNET_SCHEDULER_NO_TASK != n->task)
909 GNUNET_SCHEDULER_cancel (n->task);
910 n->task = GNUNET_SCHEDULER_NO_TASK;
912 /* free rest of memory */
918 * Transmit a message using the current session of the given
921 * @param n entry for the recipient
922 * @param msgbuf buffer to transmit
923 * @param msgbuf_size number of bytes in buffer
924 * @param priority transmission priority
925 * @param timeout transmission timeout
926 * @param cont continuation to call when finished (can be NULL)
927 * @param cont_cls closure for cont
930 send_with_session (struct NeighbourMapEntry *n,
931 const char *msgbuf, size_t msgbuf_size,
933 struct GNUNET_TIME_Relative timeout,
934 GNUNET_TRANSPORT_TransmitContinuation cont,
937 struct GNUNET_TRANSPORT_PluginFunctions *papi;
939 GNUNET_assert (n->primary_address.session != NULL);
940 if ( ( (NULL == (papi = GST_plugins_find (n->primary_address.address->transport_name))) ||
941 (-1 == papi->send (papi->cls,
942 n->primary_address.session,
948 cont (cont_cls, &n->id, GNUNET_SYSERR);
949 GNUNET_break (NULL != papi);
954 * Master task run for every neighbour. Performs all of the time-related
955 * activities (keep alive, send next message, disconnect if idle, finish
956 * clean up after disconnect).
958 * @param cls the 'struct NeighbourMapEntry' for which we are running
959 * @param tc scheduler context (unused)
962 master_task (void *cls,
963 const struct GNUNET_SCHEDULER_TaskContext *tc);
967 * Function called when the 'DISCONNECT' message has been sent by the
968 * plugin. Frees the neighbour --- if the entry still exists.
971 * @param target identity of the neighbour that was disconnected
972 * @param result GNUNET_OK if the disconnect got out successfully
975 send_disconnect_cont (void *cls, const struct GNUNET_PeerIdentity *target,
978 struct NeighbourMapEntry *n;
980 n = lookup_neighbour (target);
982 return; /* already gone */
983 if (S_DISCONNECT != n->state)
984 return; /* have created a fresh entry since */
985 n->state = S_DISCONNECT;
986 GNUNET_SCHEDULER_cancel (n->task);
987 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
992 * Transmit a DISCONNECT message to the other peer.
994 * @param n neighbour to send DISCONNECT message.
997 send_disconnect (struct NeighbourMapEntry *n)
999 struct SessionDisconnectMessage disconnect_msg;
1001 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1002 "Sending DISCONNECT message to peer `%4s'\n",
1003 GNUNET_i2s (&n->id));
1004 disconnect_msg.header.size = htons (sizeof (struct SessionDisconnectMessage));
1005 disconnect_msg.header.type =
1006 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1007 disconnect_msg.reserved = htonl (0);
1008 disconnect_msg.purpose.size =
1009 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
1010 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
1011 sizeof (struct GNUNET_TIME_AbsoluteNBO));
1012 disconnect_msg.purpose.purpose =
1013 htonl (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1014 disconnect_msg.timestamp =
1015 GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1016 disconnect_msg.public_key = GST_my_public_key;
1017 GNUNET_assert (GNUNET_OK ==
1018 GNUNET_CRYPTO_rsa_sign (GST_my_private_key,
1019 &disconnect_msg.purpose,
1020 &disconnect_msg.signature));
1022 send_with_session (n,
1023 (const char *) &disconnect_msg, sizeof (disconnect_msg),
1024 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
1025 &send_disconnect_cont, NULL);
1026 GNUNET_STATISTICS_update (GST_stats,
1028 ("# DISCONNECT messages sent"), 1,
1034 * Disconnect from the given neighbour, clean up the record.
1036 * @param n neighbour to disconnect from
1039 disconnect_neighbour (struct NeighbourMapEntry *n)
1041 /* depending on state, notify neighbour and/or upper layers of this peer
1045 case S_NOT_CONNECTED:
1047 case S_INIT_BLACKLIST:
1048 /* other peer is completely unaware of us, no need to send DISCONNECT */
1049 n->state = S_DISCONNECT_FINISHED;
1052 case S_CONNECT_SENT:
1053 send_disconnect (n);
1054 n->state = S_DISCONNECT;
1056 case S_CONNECT_RECV_ATS:
1057 case S_CONNECT_RECV_BLACKLIST:
1058 /* we never ACK'ed the other peer's request, no need to send DISCONNECT */
1059 n->state = S_DISCONNECT_FINISHED;
1062 case S_CONNECT_RECV_ACK:
1063 /* we DID ACK the other peer's request, must send DISCONNECT */
1064 send_disconnect (n);
1065 n->state = S_DISCONNECT;
1068 case S_RECONNECT_BLACKLIST:
1069 case S_RECONNECT_SENT:
1070 case S_CONNECTED_SWITCHING_BLACKLIST:
1071 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1072 /* we are currently connected, need to send disconnect and do
1073 internal notifications and update statistics */
1074 send_disconnect (n);
1075 GNUNET_STATISTICS_set (GST_stats,
1076 gettext_noop ("# peers connected"),
1077 --neighbours_connected,
1079 disconnect_notify_cb (callback_cls, &n->id);
1080 n->state = S_DISCONNECT;
1082 case S_RECONNECT_ATS:
1083 /* ATS address request timeout, disconnect without sending disconnect message */
1084 GNUNET_STATISTICS_set (GST_stats,
1085 gettext_noop ("# peers connected"),
1086 --neighbours_connected,
1088 disconnect_notify_cb (callback_cls, &n->id);
1089 n->state = S_DISCONNECT;
1092 /* already disconnected, ignore */
1094 case S_DISCONNECT_FINISHED:
1095 /* already cleaned up, how did we get here!? */
1099 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1103 /* schedule timeout to clean up */
1104 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1105 GNUNET_SCHEDULER_cancel (n->task);
1106 n->task = GNUNET_SCHEDULER_add_delayed (DISCONNECT_SENT_TIMEOUT,
1112 * We're done with our transmission attempt, continue processing.
1114 * @param cls the 'struct MessageQueue' of the message
1115 * @param receiver intended receiver
1116 * @param success whether it worked or not
1119 transmit_send_continuation (void *cls,
1120 const struct GNUNET_PeerIdentity *receiver,
1123 struct MessageQueue *mq = cls;
1124 struct NeighbourMapEntry *n;
1126 n = lookup_neighbour (receiver);
1133 if (n->is_active == mq)
1135 /* this is still "our" neighbour, remove us from its queue
1136 and allow it to send the next message now */
1137 n->is_active = NULL;
1138 GNUNET_SCHEDULER_cancel (n->task);
1139 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1141 GNUNET_assert (bytes_in_send_queue >= mq->message_buf_size);
1142 bytes_in_send_queue -= mq->message_buf_size;
1143 GNUNET_STATISTICS_set (GST_stats,
1145 ("# bytes in message queue for other peers"),
1146 bytes_in_send_queue, GNUNET_NO);
1147 if (GNUNET_OK == success)
1148 GNUNET_STATISTICS_update (GST_stats,
1150 ("# messages transmitted to other peers"),
1153 GNUNET_STATISTICS_update (GST_stats,
1155 ("# transmission failures for messages to other peers"),
1157 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1158 "Sending message to `%s' of type %u was a %s\n",
1159 GNUNET_i2s (receiver),
1160 ntohs (((struct GNUNET_MessageHeader *) mq->message_buf)->type),
1161 (success == GNUNET_OK) ? "success" : "FAILURE");
1162 if (NULL != mq->cont)
1163 mq->cont (mq->cont_cls, success);
1169 * Check the message list for the given neighbour and if we can
1170 * send a message, do so. This function should only be called
1171 * if the connection is at least generally ready for transmission.
1172 * While we will only send one message at a time, no bandwidth
1173 * quota management is performed here. If a message was given to
1174 * the plugin, the continuation will automatically re-schedule
1175 * the 'master' task once the next message might be transmitted.
1177 * @param n target peer for which to transmit
1180 try_transmission_to_peer (struct NeighbourMapEntry *n)
1182 struct MessageQueue *mq;
1183 struct GNUNET_TIME_Relative timeout;
1185 if (NULL == n->primary_address.address)
1187 /* no address, why are we here? */
1191 if ((0 == n->primary_address.address->address_length) &&
1192 (NULL == n->primary_address.session))
1194 /* no address, why are we here? */
1198 if (NULL != n->is_active)
1200 /* transmission already pending */
1204 /* timeout messages from the queue that are past their due date */
1205 while (NULL != (mq = n->messages_head))
1207 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1208 if (timeout.rel_value > 0)
1210 GNUNET_STATISTICS_update (GST_stats,
1212 ("# messages timed out while in transport queue"),
1214 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
1216 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR); /* timeout */
1219 return; /* no more messages */
1220 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
1222 send_with_session (n,
1223 mq->message_buf, mq->message_buf_size,
1224 0 /* priority */, timeout,
1225 &transmit_send_continuation, mq);
1230 * Send keepalive message to the neighbour. Must only be called
1231 * if we are on 'connected' state. Will internally determine
1232 * if a keepalive is truly needed (so can always be called).
1234 * @param n neighbour that went idle and needs a keepalive
1237 send_keepalive (struct NeighbourMapEntry *n)
1239 struct GNUNET_MessageHeader m;
1241 GNUNET_assert (S_CONNECTED == n->state);
1242 if (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time).rel_value > 0)
1243 return; /* no keepalive needed at this time */
1244 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1245 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE);
1246 send_with_session (n,
1247 (const void *) &m, sizeof (m),
1248 UINT32_MAX /* priority */,
1249 KEEPALIVE_FREQUENCY,
1251 GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# keepalives sent"), 1,
1253 n->expect_latency_response = GNUNET_YES;
1254 n->last_keep_alive_time = GNUNET_TIME_absolute_get ();
1255 n->keep_alive_time = GNUNET_TIME_relative_to_absolute (KEEPALIVE_FREQUENCY);
1260 * Keep the connection to the given neighbour alive longer,
1261 * we received a KEEPALIVE (or equivalent); send a response.
1263 * @param neighbour neighbour to keep alive (by sending keep alive response)
1266 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
1268 struct NeighbourMapEntry *n;
1269 struct GNUNET_MessageHeader m;
1271 if (NULL == (n = lookup_neighbour (neighbour)))
1273 GNUNET_STATISTICS_update (GST_stats,
1275 ("# KEEPALIVE messages discarded (peer unknown)"),
1279 if (NULL == n->primary_address.session)
1281 GNUNET_STATISTICS_update (GST_stats,
1283 ("# KEEPALIVE messages discarded (no session)"),
1287 /* send reply to allow neighbour to measure latency */
1288 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1289 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE_RESPONSE);
1290 send_with_session(n,
1291 (const void *) &m, sizeof (m),
1292 UINT32_MAX /* priority */,
1293 KEEPALIVE_FREQUENCY,
1299 * We received a KEEP_ALIVE_RESPONSE message and use this to calculate
1300 * latency to this peer. Pass the updated information (existing ats
1301 * plus calculated latency) to ATS.
1303 * @param neighbour neighbour to keep alive
1304 * @param ats performance data
1305 * @param ats_count number of entries in ats
1308 GST_neighbours_keepalive_response (const struct GNUNET_PeerIdentity *neighbour,
1309 const struct GNUNET_ATS_Information *ats,
1312 struct NeighbourMapEntry *n;
1314 struct GNUNET_ATS_Information ats_new[ats_count + 1];
1316 if (NULL == (n = lookup_neighbour (neighbour)))
1318 GNUNET_STATISTICS_update (GST_stats,
1320 ("# KEEPALIVE_RESPONSE messages discarded (not connected)"),
1324 if ( (S_CONNECTED != n->state) ||
1325 (GNUNET_YES != n->expect_latency_response) )
1327 GNUNET_STATISTICS_update (GST_stats,
1329 ("# KEEPALIVE_RESPONSE messages discarded (not expected)"),
1333 n->expect_latency_response = GNUNET_NO;
1334 n->latency = GNUNET_TIME_absolute_get_duration (n->last_keep_alive_time);
1335 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1336 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1337 "Latency for peer `%s' is %llu ms\n",
1338 GNUNET_i2s (&n->id), n->latency.rel_value);
1339 memcpy (ats_new, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1340 /* append latency */
1341 ats_new[ats_count].type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
1342 if (n->latency.rel_value > UINT32_MAX)
1343 latency = UINT32_MAX;
1345 latency = n->latency.rel_value;
1346 ats_new[ats_count].value = htonl (latency);
1347 GNUNET_ATS_address_update (GST_ats,
1348 n->primary_address.address,
1349 n->primary_address.session, ats_new,
1355 * We have received a message from the given sender. How long should
1356 * we delay before receiving more? (Also used to keep the peer marked
1359 * @param sender sender of the message
1360 * @param size size of the message
1361 * @param do_forward set to GNUNET_YES if the message should be forwarded to clients
1362 * GNUNET_NO if the neighbour is not connected or violates the quota,
1363 * GNUNET_SYSERR if the connection is not fully up yet
1364 * @return how long to wait before reading more from this sender
1366 struct GNUNET_TIME_Relative
1367 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
1368 *sender, ssize_t size, int *do_forward)
1370 struct NeighbourMapEntry *n;
1371 struct GNUNET_TIME_Relative ret;
1373 if (NULL == neighbours)
1375 *do_forward = GNUNET_NO;
1376 return GNUNET_TIME_UNIT_FOREVER_REL; /* This can happen during shutdown */
1378 if (NULL == (n = lookup_neighbour (sender)))
1380 GST_neighbours_try_connect (sender);
1381 if (NULL == (n = lookup_neighbour (sender)))
1383 GNUNET_STATISTICS_update (GST_stats,
1385 ("# messages discarded due to lack of neighbour record"),
1387 *do_forward = GNUNET_NO;
1388 return GNUNET_TIME_UNIT_ZERO;
1391 if (! test_connected (n))
1393 *do_forward = GNUNET_SYSERR;
1394 return GNUNET_TIME_UNIT_ZERO;
1396 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
1398 n->quota_violation_count++;
1399 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1400 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
1401 n->in_tracker.available_bytes_per_s__,
1402 n->quota_violation_count);
1403 /* Discount 32k per violation */
1404 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
1408 if (n->quota_violation_count > 0)
1410 /* try to add 32k back */
1411 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
1412 n->quota_violation_count--;
1415 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
1417 GNUNET_STATISTICS_update (GST_stats,
1419 ("# bandwidth quota violations by other peers"),
1421 *do_forward = GNUNET_NO;
1422 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
1424 *do_forward = GNUNET_YES;
1425 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 32 * 1024);
1426 if (ret.rel_value > 0)
1428 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1429 "Throttling read (%llu bytes excess at %u b/s), waiting %llu ms before reading more.\n",
1430 (unsigned long long) n->in_tracker.
1431 consumption_since_last_update__,
1432 (unsigned int) n->in_tracker.available_bytes_per_s__,
1433 (unsigned long long) ret.rel_value);
1434 GNUNET_STATISTICS_update (GST_stats,
1435 gettext_noop ("# ms throttling suggested"),
1436 (int64_t) ret.rel_value, GNUNET_NO);
1443 * Transmit a message to the given target using the active connection.
1445 * @param target destination
1446 * @param msg message to send
1447 * @param msg_size number of bytes in msg
1448 * @param timeout when to fail with timeout
1449 * @param cont function to call when done
1450 * @param cont_cls closure for 'cont'
1453 GST_neighbours_send (const struct GNUNET_PeerIdentity *target, const void *msg,
1454 size_t msg_size, struct GNUNET_TIME_Relative timeout,
1455 GST_NeighbourSendContinuation cont, void *cont_cls)
1457 struct NeighbourMapEntry *n;
1458 struct MessageQueue *mq;
1460 /* All ove these cases should never happen; they are all API violations.
1461 But we check anyway, just to be sure. */
1462 if (NULL == (n = lookup_neighbour (target)))
1466 cont (cont_cls, GNUNET_SYSERR);
1469 if (GNUNET_YES != test_connected (n))
1473 cont (cont_cls, GNUNET_SYSERR);
1476 bytes_in_send_queue += msg_size;
1477 GNUNET_STATISTICS_set (GST_stats,
1479 ("# bytes in message queue for other peers"),
1480 bytes_in_send_queue, GNUNET_NO);
1481 mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
1483 mq->cont_cls = cont_cls;
1484 memcpy (&mq[1], msg, msg_size);
1485 mq->message_buf = (const char *) &mq[1];
1486 mq->message_buf_size = msg_size;
1487 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1488 GNUNET_CONTAINER_DLL_insert_tail (n->messages_head, n->messages_tail, mq);
1489 if ( (NULL != n->is_active) ||
1490 ( (NULL == n->primary_address.session) && (NULL == n->primary_address.address)) )
1492 GNUNET_SCHEDULER_cancel (n->task);
1493 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1498 * Send a SESSION_CONNECT message via the given address.
1500 * @param na address to use
1503 send_session_connect (struct NeighbourAddress *na)
1505 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1506 struct SessionConnectMessage connect_msg;
1508 if (NULL == (papi = GST_plugins_find (na->address->transport_name)))
1513 if (NULL == na->session)
1514 na->session = papi->get_session (papi->cls, na->address);
1515 if (NULL == na->session)
1520 na->connect_timestamp = GNUNET_TIME_absolute_get ();
1521 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1522 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
1523 connect_msg.reserved = htonl (0);
1524 connect_msg.timestamp = GNUNET_TIME_absolute_hton (na->connect_timestamp);
1525 (void) papi->send (papi->cls,
1527 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1529 GNUNET_TIME_UNIT_FOREVER_REL,
1535 * Send a SESSION_CONNECT_ACK message via the given address.
1537 * @param address address to use
1538 * @param session session to use
1539 * @param timestamp timestamp to use for the ACK message
1542 send_session_connect_ack_message (const struct GNUNET_HELLO_Address *address,
1543 struct Session *session,
1544 struct GNUNET_TIME_Absolute timestamp)
1546 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1547 struct SessionConnectMessage connect_msg;
1549 if (NULL == (papi = GST_plugins_find (address->transport_name)))
1554 if (NULL == session)
1555 session = papi->get_session (papi->cls, address);
1556 if (NULL == session)
1561 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1562 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT_ACK);
1563 connect_msg.reserved = htonl (0);
1564 connect_msg.timestamp = GNUNET_TIME_absolute_hton (timestamp);
1565 (void) papi->send (papi->cls,
1567 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1569 GNUNET_TIME_UNIT_FOREVER_REL,
1575 * Create a fresh entry in the neighbour map for the given peer
1577 * @param peer peer to create an entry for
1578 * @return new neighbour map entry
1580 static struct NeighbourMapEntry *
1581 setup_neighbour (const struct GNUNET_PeerIdentity *peer)
1583 struct NeighbourMapEntry *n;
1585 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1586 "Creating new neighbour entry for `%s'\n",
1588 n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
1590 n->state = S_NOT_CONNECTED;
1591 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
1592 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
1593 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
1594 MAX_BANDWIDTH_CARRY_S);
1595 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1596 GNUNET_assert (GNUNET_OK ==
1597 GNUNET_CONTAINER_multihashmap_put (neighbours,
1598 &n->id.hashPubKey, n,
1599 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1605 * Check if the two given addresses are the same.
1606 * Actually only checks if the sessions are non-NULL
1607 * (which they should be) and then if they are identical;
1608 * the actual addresses don't matter if the session
1609 * pointers match anyway, and we must have session pointers
1612 * @param a1 first address to compare
1613 * @param a2 other address to compare
1614 * @return GNUNET_NO if the addresses do not match, GNUNET_YES if they do match
1617 address_matches (const struct NeighbourAddress *a1,
1618 const struct NeighbourAddress *a2)
1620 if ( (NULL == a1->session) ||
1621 (NULL == a2->session) )
1626 return (a1->session == a2->session) ? GNUNET_YES : GNUNET_NO;
1631 * Try to create a connection to the given target (eventually).
1633 * @param target peer to try to connect to
1636 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
1638 struct NeighbourMapEntry *n;
1640 if (NULL == neighbours)
1641 return; /* during shutdown, do nothing */
1642 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1643 "Asked to connect to peer `%s'\n",
1644 GNUNET_i2s (target));
1646 memcmp (target, &GST_my_identity, sizeof (struct GNUNET_PeerIdentity)))
1648 /* refuse to connect to myself */
1649 /* FIXME: can this happen? Is this not an API violation? */
1650 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1651 "Refusing to try to connect to myself.\n");
1654 n = lookup_neighbour (target);
1659 case S_NOT_CONNECTED:
1660 /* this should not be possible */
1665 case S_INIT_BLACKLIST:
1666 case S_CONNECT_SENT:
1667 case S_CONNECT_RECV_ATS:
1668 case S_CONNECT_RECV_BLACKLIST:
1669 case S_CONNECT_RECV_ACK:
1670 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1671 "Ignoring request to try to connect to `%s', already trying!\n",
1672 GNUNET_i2s (target));
1673 return; /* already trying */
1675 case S_RECONNECT_ATS:
1676 case S_RECONNECT_BLACKLIST:
1677 case S_RECONNECT_SENT:
1678 case S_CONNECTED_SWITCHING_BLACKLIST:
1679 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1680 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1681 "Ignoring request to try to connect, already connected to `%s'!\n",
1682 GNUNET_i2s (target));
1683 return; /* already connected */
1685 /* get rid of remains, ready to re-try immediately */
1688 case S_DISCONNECT_FINISHED:
1689 /* should not be possible */
1692 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1698 n = setup_neighbour (target);
1699 n->state = S_INIT_ATS;
1700 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1701 GNUNET_ATS_suggest_address (GST_ats, target);
1706 * Function called with the result of a blacklist check.
1708 * @param cls closure with the 'struct BlackListCheckContext'
1709 * @param peer peer this check affects
1710 * @param result GNUNET_OK if the address is allowed
1713 handle_test_blacklist_cont (void *cls,
1714 const struct GNUNET_PeerIdentity *peer,
1717 struct BlackListCheckContext *bcc = cls;
1718 struct NeighbourMapEntry *n;
1721 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1722 "Connection to new address of peer `%s' based on blacklist is `%s'\n",
1724 (GNUNET_OK == result) ? "allowed" : "FORBIDDEN");
1725 if (GNUNET_OK == result)
1727 /* valid new address, let ATS know! */
1728 GNUNET_ATS_address_update (GST_ats,
1731 bcc->ats, bcc->ats_count);
1733 if (NULL == (n = lookup_neighbour (peer)))
1734 goto cleanup; /* nobody left to care about new address */
1737 case S_NOT_CONNECTED:
1738 /* this should not be possible */
1743 /* still waiting on ATS suggestion */
1745 case S_INIT_BLACKLIST:
1746 /* check if the address the blacklist was fine with matches
1747 ATS suggestion, if so, we can move on! */
1748 if ( (GNUNET_OK == result) &&
1749 (1 == n->send_connect_ack) )
1751 n->send_connect_ack = 2;
1752 send_session_connect_ack_message (bcc->na.address,
1754 n->connect_ack_timestamp);
1756 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1757 break; /* result for an address we currently don't care about */
1758 if (GNUNET_OK == result)
1760 n->timeout = GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT);
1761 n->state = S_CONNECT_SENT;
1762 send_session_connect (&n->primary_address);
1766 GNUNET_ATS_address_destroyed (GST_ats,
1769 n->state = S_INIT_ATS;
1770 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1771 // FIXME: do we need to ask ATS again for suggestions?
1772 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1775 case S_CONNECT_SENT:
1776 /* waiting on CONNECT_ACK, send ACK if one is pending */
1777 if ( (GNUNET_OK == result) &&
1778 (1 == n->send_connect_ack) )
1780 n->send_connect_ack = 2;
1781 send_session_connect_ack_message (n->primary_address.address,
1782 n->primary_address.session,
1783 n->connect_ack_timestamp);
1786 case S_CONNECT_RECV_ATS:
1787 /* still waiting on ATS suggestion, don't care about blacklist */
1789 case S_CONNECT_RECV_BLACKLIST:
1790 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1791 break; /* result for an address we currently don't care about */
1792 if (GNUNET_OK == result)
1794 n->timeout = GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT);
1795 n->state = S_CONNECT_RECV_ACK;
1796 send_session_connect_ack_message (bcc->na.address,
1798 n->connect_ack_timestamp);
1799 if (1 == n->send_connect_ack)
1800 n->send_connect_ack = 2;
1804 GNUNET_ATS_address_destroyed (GST_ats,
1807 n->state = S_INIT_ATS;
1808 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1809 // FIXME: do we need to ask ATS again for suggestions?
1810 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1813 case S_CONNECT_RECV_ACK:
1814 /* waiting on SESSION_ACK, send ACK if one is pending */
1815 if ( (GNUNET_OK == result) &&
1816 (1 == n->send_connect_ack) )
1818 n->send_connect_ack = 2;
1819 send_session_connect_ack_message (n->primary_address.address,
1820 n->primary_address.session,
1821 n->connect_ack_timestamp);
1825 /* already connected, don't care about blacklist */
1827 case S_RECONNECT_ATS:
1828 /* still waiting on ATS suggestion, don't care about blacklist */
1830 case S_RECONNECT_BLACKLIST:
1831 if ( (GNUNET_OK == result) &&
1832 (1 == n->send_connect_ack) )
1834 n->send_connect_ack = 2;
1835 send_session_connect_ack_message (bcc->na.address,
1837 n->connect_ack_timestamp);
1839 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1840 break; /* result for an address we currently don't care about */
1841 if (GNUNET_OK == result)
1843 send_session_connect (&n->primary_address);
1844 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
1845 n->state = S_RECONNECT_SENT;
1849 GNUNET_ATS_address_destroyed (GST_ats,
1852 n->state = S_RECONNECT_ATS;
1853 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1854 // FIXME: do we need to ask ATS again for suggestions?
1855 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1858 case S_RECONNECT_SENT:
1859 /* waiting on CONNECT_ACK, don't care about blacklist */
1860 if ( (GNUNET_OK == result) &&
1861 (1 == n->send_connect_ack) )
1863 n->send_connect_ack = 2;
1864 send_session_connect_ack_message (n->primary_address.address,
1865 n->primary_address.session,
1866 n->connect_ack_timestamp);
1869 case S_CONNECTED_SWITCHING_BLACKLIST:
1870 if (GNUNET_YES != address_matches (&bcc->na, &n->alternative_address))
1871 break; /* result for an address we currently don't care about */
1872 if (GNUNET_OK == result)
1874 send_session_connect (&n->alternative_address);
1875 n->state = S_CONNECTED_SWITCHING_CONNECT_SENT;
1879 GNUNET_ATS_address_destroyed (GST_ats,
1882 free_address (&n->alternative_address);
1883 n->state = S_CONNECTED;
1886 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1887 /* waiting on CONNECT_ACK, don't care about blacklist */
1888 if ( (GNUNET_OK == result) &&
1889 (1 == n->send_connect_ack) )
1891 n->send_connect_ack = 2;
1892 send_session_connect_ack_message (n->primary_address.address,
1893 n->primary_address.session,
1894 n->connect_ack_timestamp);
1898 /* Nothing to do here, ATS will already do what can be done */
1900 case S_DISCONNECT_FINISHED:
1901 /* should not be possible */
1905 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1911 GNUNET_HELLO_address_free (bcc->na.address);
1912 GNUNET_CONTAINER_DLL_remove (bc_head,
1920 * We want to know if connecting to a particular peer via
1921 * a particular address is allowed. Check it!
1923 * @param peer identity of the peer to switch the address for
1924 * @param ts time at which the check was initiated
1925 * @param address address of the other peer, NULL if other peer
1927 * @param session session to use (or NULL)
1928 * @param ats performance data
1929 * @param ats_count number of entries in ats (excluding 0-termination)
1932 check_blacklist (const struct GNUNET_PeerIdentity *peer,
1933 struct GNUNET_TIME_Absolute ts,
1934 const struct GNUNET_HELLO_Address *address,
1935 struct Session *session,
1936 const struct GNUNET_ATS_Information *ats,
1939 struct BlackListCheckContext *bcc;
1940 struct GST_BlacklistCheck *bc;
1943 GNUNET_malloc (sizeof (struct BlackListCheckContext) +
1944 sizeof (struct GNUNET_ATS_Information) * ats_count);
1945 bcc->ats_count = ats_count;
1946 bcc->na.address = GNUNET_HELLO_address_copy (address);
1947 bcc->na.session = session;
1948 bcc->na.connect_timestamp = ts;
1949 bcc->ats = (struct GNUNET_ATS_Information *) &bcc[1];
1950 memcpy (bcc->ats, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1951 GNUNET_CONTAINER_DLL_insert (bc_head,
1954 if (NULL != (bc = GST_blacklist_test_allowed (peer,
1955 address->transport_name,
1956 &handle_test_blacklist_cont, bcc)))
1958 /* if NULL == bc, 'cont' was already called and 'bcc' already free'd, so
1959 we must only store 'bc' if 'bc' is non-NULL... */
1964 * We received a 'SESSION_CONNECT' message from the other peer.
1965 * Consider switching to it.
1967 * @param message possibly a 'struct SessionConnectMessage' (check format)
1968 * @param peer identity of the peer to switch the address for
1969 * @param address address of the other peer, NULL if other peer
1971 * @param session session to use (or NULL)
1972 * @param ats performance data
1973 * @param ats_count number of entries in ats (excluding 0-termination)
1976 GST_neighbours_handle_connect (const struct GNUNET_MessageHeader *message,
1977 const struct GNUNET_PeerIdentity *peer,
1978 const struct GNUNET_HELLO_Address *address,
1979 struct Session *session,
1980 const struct GNUNET_ATS_Information *ats,
1983 const struct SessionConnectMessage *scm;
1984 struct NeighbourMapEntry *n;
1985 struct GNUNET_TIME_Absolute ts;
1987 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1988 "Received CONNECT message from peer `%s'\n",
1990 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
1992 GNUNET_break_op (0);
1995 if (NULL == neighbours)
1996 return; /* we're shutting down */
1997 scm = (const struct SessionConnectMessage *) message;
1998 GNUNET_break_op (0 == ntohl (scm->reserved));
1999 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2000 n = lookup_neighbour (peer);
2002 n = setup_neighbour (peer);
2003 n->send_connect_ack = 1;
2004 n->connect_ack_timestamp = ts;
2007 case S_NOT_CONNECTED:
2008 n->state = S_CONNECT_RECV_ATS;
2009 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2010 GNUNET_ATS_suggest_address (GST_ats, peer);
2011 check_blacklist (peer, ts, address, session, ats, ats_count);
2014 case S_INIT_BLACKLIST:
2015 case S_CONNECT_SENT:
2016 case S_CONNECT_RECV_ATS:
2017 case S_CONNECT_RECV_BLACKLIST:
2018 case S_CONNECT_RECV_ACK:
2019 /* It can never hurt to have an alternative address in the above cases,
2020 see if it is allowed */
2021 check_blacklist (peer, ts, address, session, ats, ats_count);
2024 /* we are already connected and can thus send the ACK immediately;
2025 still, it can never hurt to have an alternative address, so also
2026 tell ATS about it */
2027 GNUNET_assert (NULL != n->primary_address.address);
2028 GNUNET_assert (NULL != n->primary_address.session);
2029 n->send_connect_ack = 0;
2030 send_session_connect_ack_message (n->primary_address.address,
2031 n->primary_address.session, ts);
2032 check_blacklist (peer, ts, address, session, ats, ats_count);
2034 case S_RECONNECT_ATS:
2035 case S_RECONNECT_BLACKLIST:
2036 case S_RECONNECT_SENT:
2037 /* It can never hurt to have an alternative address in the above cases,
2038 see if it is allowed */
2039 check_blacklist (peer, ts, address, session, ats, ats_count);
2041 case S_CONNECTED_SWITCHING_BLACKLIST:
2042 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2043 /* we are already connected and can thus send the ACK immediately;
2044 still, it can never hurt to have an alternative address, so also
2045 tell ATS about it */
2046 GNUNET_assert (NULL != n->primary_address.address);
2047 GNUNET_assert (NULL != n->primary_address.session);
2048 n->send_connect_ack = 0;
2049 send_session_connect_ack_message (n->primary_address.address,
2050 n->primary_address.session, ts);
2051 check_blacklist (peer, ts, address, session, ats, ats_count);
2054 /* get rid of remains, ready to re-try */
2056 n = setup_neighbour (peer);
2057 n->state = S_CONNECT_RECV_ATS;
2058 GNUNET_ATS_suggest_address (GST_ats, peer);
2059 check_blacklist (peer, ts, address, session, ats, ats_count);
2061 case S_DISCONNECT_FINISHED:
2062 /* should not be possible */
2066 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2075 * For an existing neighbour record, set the active connection to
2076 * use the given address.
2078 * @param peer identity of the peer to switch the address for
2079 * @param address address of the other peer, NULL if other peer
2081 * @param session session to use (or NULL)
2082 * @param ats performance data
2083 * @param ats_count number of entries in ats
2084 * @param bandwidth_in inbound quota to be used when connection is up
2085 * @param bandwidth_out outbound quota to be used when connection is up
2088 GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
2089 const struct GNUNET_HELLO_Address *address,
2090 struct Session *session,
2091 const struct GNUNET_ATS_Information *ats,
2093 struct GNUNET_BANDWIDTH_Value32NBO
2095 struct GNUNET_BANDWIDTH_Value32NBO
2098 struct NeighbourMapEntry *n;
2099 struct GNUNET_TRANSPORT_PluginFunctions *papi;
2101 GNUNET_assert (address->transport_name != NULL);
2102 if (NULL == (n = lookup_neighbour (peer)))
2105 /* Obtain an session for this address from plugin */
2106 if (NULL == (papi = GST_plugins_find (address->transport_name)))
2108 /* we don't have the plugin for this address */
2109 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2112 if ((NULL == session) && (0 == address->address_length))
2115 if (strlen (address->transport_name) > 0)
2116 GNUNET_ATS_address_destroyed (GST_ats, address, session);
2119 if (NULL == session)
2120 session = papi->get_session (papi->cls, address);
2121 if (NULL == session)
2123 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2124 "Failed to obtain new session for peer `%s' and address '%s'\n",
2125 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
2126 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2129 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2130 "ATS tells us to switch to address '%s' for peer `%s'\n",
2131 (address->address_length != 0) ? GST_plugins_a2s (address): "<inbound>",
2135 case S_NOT_CONNECTED:
2140 set_address (&n->primary_address,
2141 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2142 n->state = S_INIT_BLACKLIST;
2143 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2144 check_blacklist (&n->id,
2145 n->connect_ack_timestamp,
2146 address, session, ats, ats_count);
2148 case S_INIT_BLACKLIST:
2149 /* ATS suggests a different address, switch again */
2150 set_address (&n->primary_address,
2151 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2152 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2153 check_blacklist (&n->id,
2154 n->connect_ack_timestamp,
2155 address, session, ats, ats_count);
2157 case S_CONNECT_SENT:
2158 /* ATS suggests a different address, switch again */
2159 set_address (&n->primary_address,
2160 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2161 n->state = S_INIT_BLACKLIST;
2162 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2163 check_blacklist (&n->id,
2164 n->connect_ack_timestamp,
2165 address, session, ats, ats_count);
2167 case S_CONNECT_RECV_ATS:
2168 set_address (&n->primary_address,
2169 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2170 n->state = S_CONNECT_RECV_BLACKLIST;
2171 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2172 check_blacklist (&n->id,
2173 n->connect_ack_timestamp,
2174 address, session, ats, ats_count);
2176 case S_CONNECT_RECV_BLACKLIST:
2177 /* ATS asks us to switch while we were trying to connect; switch to new
2178 address and check blacklist again */
2179 set_address (&n->primary_address,
2180 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2181 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2182 check_blacklist (&n->id,
2183 n->connect_ack_timestamp,
2184 address, session, ats, ats_count);
2187 GNUNET_assert (NULL != n->primary_address.address);
2188 GNUNET_assert (NULL != n->primary_address.session);
2189 if (n->primary_address.session == session)
2191 /* not an address change, just a quota change */
2192 set_address (&n->primary_address,
2193 address, session, bandwidth_in, bandwidth_out, GNUNET_YES);
2196 /* ATS asks us to switch a life connection; see if we can get
2197 a CONNECT_ACK on it before we actually do this! */
2198 set_address (&n->alternative_address,
2199 address, session, bandwidth_in, bandwidth_out, GNUNET_YES);
2200 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2201 check_blacklist (&n->id,
2202 GNUNET_TIME_absolute_get (),
2203 address, session, ats, ats_count);
2205 case S_RECONNECT_ATS:
2206 set_address (&n->primary_address,
2207 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2208 n->state = S_RECONNECT_BLACKLIST;
2209 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2210 check_blacklist (&n->id,
2211 n->connect_ack_timestamp,
2212 address, session, ats, ats_count);
2214 case S_RECONNECT_BLACKLIST:
2215 /* ATS asks us to switch while we were trying to reconnect; switch to new
2216 address and check blacklist again */
2217 set_address (&n->primary_address,
2218 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2219 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2220 check_blacklist (&n->id,
2221 n->connect_ack_timestamp,
2222 address, session, ats, ats_count);
2224 case S_RECONNECT_SENT:
2225 /* ATS asks us to switch while we were trying to reconnect; switch to new
2226 address and check blacklist again */
2227 set_address (&n->primary_address,
2228 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2229 n->state = S_RECONNECT_BLACKLIST;
2230 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2231 check_blacklist (&n->id,
2232 n->connect_ack_timestamp,
2233 address, session, ats, ats_count);
2235 case S_CONNECTED_SWITCHING_BLACKLIST:
2236 if (n->primary_address.session == session)
2238 /* ATS switches back to still-active session */
2239 free_address (&n->alternative_address);
2240 n->state = S_CONNECTED;
2243 /* ATS asks us to switch a life connection, update blacklist check */
2244 set_address (&n->alternative_address,
2245 address, session, bandwidth_in, bandwidth_out, GNUNET_YES);
2246 check_blacklist (&n->id,
2247 GNUNET_TIME_absolute_get (),
2248 address, session, ats, ats_count);
2250 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2251 if (n->primary_address.session == session)
2253 /* ATS switches back to still-active session */
2254 free_address (&n->alternative_address);
2255 n->state = S_CONNECTED;
2258 /* ATS asks us to switch a life connection, update blacklist check */
2259 set_address (&n->alternative_address,
2260 address, session, bandwidth_in, bandwidth_out, GNUNET_YES);
2261 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2262 check_blacklist (&n->id,
2263 GNUNET_TIME_absolute_get (),
2264 address, session, ats, ats_count);
2267 /* not going to switch addresses while disconnecting */
2269 case S_DISCONNECT_FINISHED:
2273 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2281 * Master task run for every neighbour. Performs all of the time-related
2282 * activities (keep alive, send next message, disconnect if idle, finish
2283 * clean up after disconnect).
2285 * @param cls the 'struct NeighbourMapEntry' for which we are running
2286 * @param tc scheduler context (unused)
2289 master_task (void *cls,
2290 const struct GNUNET_SCHEDULER_TaskContext *tc)
2292 struct NeighbourMapEntry *n = cls;
2293 struct GNUNET_TIME_Relative delay;
2295 n->task = GNUNET_SCHEDULER_NO_TASK;
2296 delay = GNUNET_TIME_absolute_get_remaining (n->timeout);
2299 case S_NOT_CONNECTED:
2300 /* invalid state for master task, clean up */
2302 n->state = S_DISCONNECT_FINISHED;
2306 if (0 == delay.rel_value)
2308 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2309 "Connection to `%s' timed out waiting for ATS to provide address\n",
2310 GNUNET_i2s (&n->id));
2311 n->state = S_DISCONNECT_FINISHED;
2316 case S_INIT_BLACKLIST:
2317 if (0 == delay.rel_value)
2319 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2320 "Connection to `%s' timed out waiting for BLACKLIST to approve address\n",
2321 GNUNET_i2s (&n->id));
2322 n->state = S_DISCONNECT_FINISHED;
2327 case S_CONNECT_SENT:
2328 if (0 == delay.rel_value)
2330 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2331 "Connection to `%s' timed out waiting for other peer to send CONNECT_ACK\n",
2332 GNUNET_i2s (&n->id));
2333 disconnect_neighbour (n);
2337 case S_CONNECT_RECV_ATS:
2338 if (0 == delay.rel_value)
2340 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2341 "Connection to `%s' timed out waiting ATS to provide address to use for CONNECT_ACK\n",
2342 GNUNET_i2s (&n->id));
2343 n->state = S_DISCONNECT_FINISHED;
2348 case S_CONNECT_RECV_BLACKLIST:
2349 if (0 == delay.rel_value)
2351 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2352 "Connection to `%s' timed out waiting BLACKLIST to approve address to use for CONNECT_ACK\n",
2353 GNUNET_i2s (&n->id));
2354 n->state = S_DISCONNECT_FINISHED;
2359 case S_CONNECT_RECV_ACK:
2360 if (0 == delay.rel_value)
2362 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2363 "Connection to `%s' timed out waiting for other peer to send SESSION_ACK\n",
2364 GNUNET_i2s (&n->id));
2365 disconnect_neighbour (n);
2370 if (0 == delay.rel_value)
2372 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2373 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2374 GNUNET_i2s (&n->id));
2375 disconnect_neighbour (n);
2378 try_transmission_to_peer (n);
2381 case S_RECONNECT_ATS:
2382 if (0 == delay.rel_value)
2384 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2385 "Connection to `%s' timed out, waiting for ATS replacement address\n",
2386 GNUNET_i2s (&n->id));
2387 disconnect_neighbour (n);
2391 case S_RECONNECT_BLACKLIST:
2392 if (0 == delay.rel_value)
2394 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2395 "Connection to `%s' timed out, waiting for BLACKLIST to approve replacement address\n",
2396 GNUNET_i2s (&n->id));
2397 disconnect_neighbour (n);
2401 case S_RECONNECT_SENT:
2402 if (0 == delay.rel_value)
2404 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2405 "Connection to `%s' timed out, waiting for other peer to CONNECT_ACK replacement address\n",
2406 GNUNET_i2s (&n->id));
2407 disconnect_neighbour (n);
2411 case S_CONNECTED_SWITCHING_BLACKLIST:
2412 if (0 == delay.rel_value)
2414 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2415 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2416 GNUNET_i2s (&n->id));
2417 disconnect_neighbour (n);
2420 try_transmission_to_peer (n);
2423 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2424 if (0 == delay.rel_value)
2426 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2427 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs (after trying to CONNECT on alternative address)\n",
2428 GNUNET_i2s (&n->id));
2429 disconnect_neighbour (n);
2432 try_transmission_to_peer (n);
2436 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2437 "Cleaning up connection to `%s' after sending DISCONNECT\n",
2438 GNUNET_i2s (&n->id));
2439 n->state = S_DISCONNECT_FINISHED;
2442 case S_DISCONNECT_FINISHED:
2443 /* how did we get here!? */
2447 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2451 delay = GNUNET_TIME_relative_min (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time),
2453 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == n->task);
2454 n->task = GNUNET_SCHEDULER_add_delayed (delay,
2461 * Send a SESSION_ACK message to the neighbour to confirm that we
2462 * got his CONNECT_ACK.
2464 * @param n neighbour to send the SESSION_ACK to
2467 send_session_ack_message (struct NeighbourMapEntry *n)
2469 struct GNUNET_MessageHeader msg;
2471 msg.size = htons (sizeof (struct GNUNET_MessageHeader));
2472 msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK);
2473 (void) send_with_session(n,
2474 (const char *) &msg, sizeof (struct GNUNET_MessageHeader),
2475 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
2481 * We received a 'SESSION_CONNECT_ACK' message from the other peer.
2482 * Consider switching to it.
2484 * @param message possibly a 'struct SessionConnectMessage' (check format)
2485 * @param peer identity of the peer to switch the address for
2486 * @param address address of the other peer, NULL if other peer
2488 * @param session session to use (or NULL)
2489 * @param ats performance data
2490 * @param ats_count number of entries in ats
2493 GST_neighbours_handle_connect_ack (const struct GNUNET_MessageHeader *message,
2494 const struct GNUNET_PeerIdentity *peer,
2495 const struct GNUNET_HELLO_Address *address,
2496 struct Session *session,
2497 const struct GNUNET_ATS_Information *ats,
2500 const struct SessionConnectMessage *scm;
2501 struct GNUNET_TIME_Absolute ts;
2502 struct NeighbourMapEntry *n;
2504 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2505 "Received CONNECT_ACK message from peer `%s'\n",
2507 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2509 GNUNET_break_op (0);
2512 scm = (const struct SessionConnectMessage *) message;
2513 GNUNET_break_op (ntohl (scm->reserved) == 0);
2514 if (NULL == (n = lookup_neighbour (peer)))
2516 GNUNET_STATISTICS_update (GST_stats,
2518 ("# unexpected CONNECT_ACK messages (no peer)"),
2522 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2525 case S_NOT_CONNECTED:
2530 case S_INIT_BLACKLIST:
2531 GNUNET_STATISTICS_update (GST_stats,
2533 ("# unexpected CONNECT_ACK messages (not ready)"),
2536 case S_CONNECT_SENT:
2537 if (ts.abs_value != n->primary_address.connect_timestamp.abs_value)
2538 break; /* ACK does not match our original CONNECT message */
2539 n->state = S_CONNECTED;
2540 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2541 GNUNET_STATISTICS_set (GST_stats,
2542 gettext_noop ("# peers connected"),
2543 ++neighbours_connected,
2545 connect_notify_cb (callback_cls, &n->id, ats, ats_count);
2546 set_address (&n->primary_address,
2547 n->primary_address.address,
2548 n->primary_address.session,
2549 n->primary_address.bandwidth_in,
2550 n->primary_address.bandwidth_out,
2552 send_session_ack_message (n);
2554 case S_CONNECT_RECV_ATS:
2555 case S_CONNECT_RECV_BLACKLIST:
2556 case S_CONNECT_RECV_ACK:
2557 GNUNET_STATISTICS_update (GST_stats,
2559 ("# unexpected CONNECT_ACK messages (not ready)"),
2563 /* duplicate CONNECT_ACK, let's answer by duplciate SESSION_ACK just in case */
2564 send_session_ack_message (n);
2566 case S_RECONNECT_ATS:
2567 case S_RECONNECT_BLACKLIST:
2568 /* we didn't expect any CONNECT_ACK, as we are waiting for ATS
2569 to give us a new address... */
2570 GNUNET_STATISTICS_update (GST_stats,
2572 ("# unexpected CONNECT_ACK messages (waiting on ATS)"),
2575 case S_RECONNECT_SENT:
2576 /* new address worked; go back to connected! */
2577 n->state = S_CONNECTED;
2578 send_session_ack_message (n);
2580 case S_CONNECTED_SWITCHING_BLACKLIST:
2581 /* duplicate CONNECT_ACK, let's answer by duplciate SESSION_ACK just in case */
2582 send_session_ack_message (n);
2584 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2585 /* new address worked; adopt it and go back to connected! */
2586 n->state = S_CONNECTED;
2587 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2588 GNUNET_assert (GNUNET_NO == n->alternative_address.ats_active);
2589 set_address (&n->primary_address,
2590 n->alternative_address.address,
2591 n->alternative_address.session,
2592 n->alternative_address.bandwidth_in,
2593 n->alternative_address.bandwidth_out,
2595 free_address (&n->alternative_address);
2596 send_session_ack_message (n);
2599 GNUNET_STATISTICS_update (GST_stats,
2601 ("# unexpected CONNECT_ACK messages (disconnecting)"),
2604 case S_DISCONNECT_FINISHED:
2608 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2616 * A session was terminated. Take note; if needed, try to get
2617 * an alternative address from ATS.
2619 * @param peer identity of the peer where the session died
2620 * @param session session that is gone
2623 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
2624 struct Session *session)
2626 struct NeighbourMapEntry *n;
2627 struct BlackListCheckContext *bcc;
2628 struct BlackListCheckContext *bcc_next;
2630 /* make sure to cancel all ongoing blacklist checks involving 'session' */
2632 while (NULL != (bcc = bcc_next))
2634 bcc_next = bcc->next;
2635 if (bcc->na.session == session)
2637 GST_blacklist_test_cancel (bcc->bc);
2638 GNUNET_HELLO_address_free (bcc->na.address);
2639 GNUNET_CONTAINER_DLL_remove (bc_head,
2645 if (NULL == (n = lookup_neighbour (peer)))
2646 return; /* can't affect us */
2647 if (session != n->primary_address.session)
2649 if (session == n->alternative_address.session)
2651 free_address (&n->alternative_address);
2652 if ( (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
2653 (S_CONNECTED_SWITCHING_CONNECT_SENT == n->state) )
2654 n->state = S_CONNECTED;
2658 return; /* doesn't affect us further */
2661 n->expect_latency_response = GNUNET_NO;
2665 case S_NOT_CONNECTED:
2673 case S_INIT_BLACKLIST:
2674 case S_CONNECT_SENT:
2675 free_address (&n->primary_address);
2676 n->state = S_INIT_ATS;
2677 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2678 // FIXME: need to ask ATS for suggestions again?
2679 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2681 case S_CONNECT_RECV_ATS:
2682 case S_CONNECT_RECV_BLACKLIST:
2683 case S_CONNECT_RECV_ACK:
2684 /* error on inbound session; free neighbour entirely */
2685 free_address (&n->primary_address);
2689 free_address (&n->primary_address);
2690 n->state = S_RECONNECT_ATS;
2691 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2692 /* FIXME: is this ATS call needed? */
2693 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2695 case S_RECONNECT_ATS:
2696 /* we don't have an address, how can it go down? */
2699 case S_RECONNECT_BLACKLIST:
2700 case S_RECONNECT_SENT:
2701 n->state = S_RECONNECT_ATS;
2702 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2703 // FIXME: need to ask ATS for suggestions again?
2704 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2706 case S_CONNECTED_SWITCHING_BLACKLIST:
2707 /* primary went down while we were checking secondary against
2708 blacklist, adopt secondary as primary */
2709 free_address (&n->primary_address);
2710 n->primary_address = n->alternative_address;
2711 memset (&n->alternative_address, 0, sizeof (struct NeighbourAddress));
2712 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
2713 n->state = S_RECONNECT_BLACKLIST;
2715 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2716 /* primary went down while we were waiting for CONNECT_ACK on secondary;
2717 secondary as primary */
2718 free_address (&n->primary_address);
2719 n->primary_address = n->alternative_address;
2720 memset (&n->alternative_address, 0, sizeof (struct NeighbourAddress));
2721 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
2722 n->state = S_RECONNECT_SENT;
2725 free_address (&n->primary_address);
2727 case S_DISCONNECT_FINISHED:
2728 /* neighbour was freed and plugins told to terminate session */
2731 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2735 if (GNUNET_SCHEDULER_NO_TASK != n->task)
2736 GNUNET_SCHEDULER_cancel (n->task);
2737 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
2742 * We received a 'SESSION_ACK' message from the other peer.
2743 * If we sent a 'CONNECT_ACK' last, this means we are now
2744 * connected. Otherwise, do nothing.
2746 * @param message possibly a 'struct SessionConnectMessage' (check format)
2747 * @param peer identity of the peer to switch the address for
2748 * @param address address of the other peer, NULL if other peer
2750 * @param session session to use (or NULL)
2751 * @param ats performance data
2752 * @param ats_count number of entries in ats
2755 GST_neighbours_handle_session_ack (const struct GNUNET_MessageHeader *message,
2756 const struct GNUNET_PeerIdentity *peer,
2757 const struct GNUNET_HELLO_Address *address,
2758 struct Session *session,
2759 const struct GNUNET_ATS_Information *ats,
2762 struct NeighbourMapEntry *n;
2764 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2765 "Received SESSION_ACK message from peer `%s'\n",
2767 if (ntohs (message->size) != sizeof (struct GNUNET_MessageHeader))
2769 GNUNET_break_op (0);
2772 if (NULL == (n = lookup_neighbour (peer)))
2774 /* check if we are in a plausible state for having sent
2775 a CONNECT_ACK. If not, return, otherwise break */
2776 if ( ( (S_CONNECT_RECV_ACK != n->state) &&
2777 (S_CONNECT_SENT != n->state) ) ||
2778 (2 != n->send_connect_ack) )
2780 GNUNET_STATISTICS_update (GST_stats,
2781 gettext_noop ("# unexpected SESSION ACK messages"), 1,
2785 n->state = S_CONNECTED;
2786 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2787 GNUNET_STATISTICS_set (GST_stats,
2788 gettext_noop ("# peers connected"),
2789 ++neighbours_connected,
2791 connect_notify_cb (callback_cls, &n->id, ats, ats_count);
2792 set_address (&n->primary_address,
2793 n->primary_address.address,
2794 n->primary_address.session,
2795 n->primary_address.bandwidth_in,
2796 n->primary_address.bandwidth_out,
2802 * Test if we're connected to the given peer.
2804 * @param target peer to test
2805 * @return GNUNET_YES if we are connected, GNUNET_NO if not
2808 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
2810 return test_connected (lookup_neighbour (target));
2815 * Change the incoming quota for the given peer.
2817 * @param neighbour identity of peer to change qutoa for
2818 * @param quota new quota
2821 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
2822 struct GNUNET_BANDWIDTH_Value32NBO quota)
2824 struct NeighbourMapEntry *n;
2826 if (NULL == (n = lookup_neighbour (neighbour)))
2828 GNUNET_STATISTICS_update (GST_stats,
2830 ("# SET QUOTA messages ignored (no such peer)"),
2834 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2835 "Setting inbound quota of %u Bps for peer `%s' to all clients\n",
2836 ntohl (quota.value__), GNUNET_i2s (&n->id));
2837 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
2838 if (0 != ntohl (quota.value__))
2840 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
2841 GNUNET_i2s (&n->id), "SET_QUOTA");
2842 if (GNUNET_YES == test_connected (n))
2843 GNUNET_STATISTICS_update (GST_stats,
2844 gettext_noop ("# disconnects due to quota of 0"),
2846 disconnect_neighbour (n);
2851 * We received a disconnect message from the given peer,
2852 * validate and process.
2854 * @param peer sender of the message
2855 * @param msg the disconnect message
2858 GST_neighbours_handle_disconnect_message (const struct GNUNET_PeerIdentity
2860 const struct GNUNET_MessageHeader
2863 struct NeighbourMapEntry *n;
2864 const struct SessionDisconnectMessage *sdm;
2867 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2868 "Received DISCONNECT message from peer `%s'\n",
2870 if (ntohs (msg->size) != sizeof (struct SessionDisconnectMessage))
2872 // GNUNET_break_op (0);
2873 GNUNET_STATISTICS_update (GST_stats,
2875 ("# disconnect messages ignored (old format)"), 1,
2879 sdm = (const struct SessionDisconnectMessage *) msg;
2880 if (NULL == (n = lookup_neighbour (peer)))
2881 return; /* gone already */
2882 if (GNUNET_TIME_absolute_ntoh (sdm->timestamp).abs_value <= n->connect_ack_timestamp.abs_value)
2884 GNUNET_STATISTICS_update (GST_stats,
2886 ("# disconnect messages ignored (timestamp)"), 1,
2890 GNUNET_CRYPTO_hash (&sdm->public_key,
2891 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2893 if (0 != memcmp (peer, &hc, sizeof (struct GNUNET_PeerIdentity)))
2895 GNUNET_break_op (0);
2898 if (ntohl (sdm->purpose.size) !=
2899 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2900 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
2901 sizeof (struct GNUNET_TIME_AbsoluteNBO))
2903 GNUNET_break_op (0);
2907 GNUNET_CRYPTO_rsa_verify
2908 (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT, &sdm->purpose,
2909 &sdm->signature, &sdm->public_key))
2911 GNUNET_break_op (0);
2914 if (GNUNET_YES == test_connected (n))
2915 GNUNET_STATISTICS_update (GST_stats,
2917 ("# other peer asked to disconnect from us"), 1,
2919 disconnect_neighbour (n);
2924 * Closure for the neighbours_iterate function.
2926 struct IteratorContext
2929 * Function to call on each connected neighbour.
2931 GST_NeighbourIterator cb;
2941 * Call the callback from the closure for each connected neighbour.
2943 * @param cls the 'struct IteratorContext'
2944 * @param key the hash of the public key of the neighbour
2945 * @param value the 'struct NeighbourMapEntry'
2946 * @return GNUNET_OK (continue to iterate)
2949 neighbours_iterate (void *cls, const GNUNET_HashCode * key, void *value)
2951 struct IteratorContext *ic = cls;
2952 struct NeighbourMapEntry *n = value;
2954 if (GNUNET_YES == test_connected (n))
2955 ic->cb (ic->cb_cls, &n->id, NULL, 0, n->primary_address.address);
2961 * Iterate over all connected neighbours.
2963 * @param cb function to call
2964 * @param cb_cls closure for cb
2967 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
2969 struct IteratorContext ic;
2971 if (NULL == neighbours)
2972 return; /* can happen during shutdown */
2975 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
2980 * If we have an active connection to the given target, it must be shutdown.
2982 * @param target peer to disconnect from
2985 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
2987 struct NeighbourMapEntry *n;
2989 if (NULL == (n = lookup_neighbour (target)))
2990 return; /* not active */
2991 if (GNUNET_YES == test_connected (n))
2992 GNUNET_STATISTICS_update (GST_stats,
2994 ("# disconnected from peer upon explicit request"), 1,
2996 disconnect_neighbour (n);
3001 * Obtain current latency information for the given neighbour.
3003 * @param peer to get the latency for
3004 * @return observed latency of the address, FOREVER if the
3005 * the connection is not up
3007 struct GNUNET_TIME_Relative
3008 GST_neighbour_get_latency (const struct GNUNET_PeerIdentity *peer)
3010 struct NeighbourMapEntry *n;
3012 n = lookup_neighbour (peer);
3014 return GNUNET_TIME_UNIT_FOREVER_REL;
3018 case S_RECONNECT_SENT:
3019 case S_RECONNECT_ATS:
3021 case S_NOT_CONNECTED:
3022 case S_INIT_BLACKLIST:
3024 case S_CONNECT_SENT:
3025 case S_CONNECT_RECV_BLACKLIST:
3027 case S_DISCONNECT_FINISHED:
3028 return GNUNET_TIME_UNIT_FOREVER_REL;
3030 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
3034 return GNUNET_TIME_UNIT_FOREVER_REL;
3039 * Obtain current address information for the given neighbour.
3042 * @return address currently used
3044 struct GNUNET_HELLO_Address *
3045 GST_neighbour_get_current_address (const struct GNUNET_PeerIdentity *peer)
3047 struct NeighbourMapEntry *n;
3049 n = lookup_neighbour (peer);
3052 return n->primary_address.address;
3057 * Initialize the neighbours subsystem.
3059 * @param cls closure for callbacks
3060 * @param connect_cb function to call if we connect to a peer
3061 * @param disconnect_cb function to call if we disconnect from a peer
3062 * @param peer_address_cb function to call if we change an active address
3066 GST_neighbours_start (void *cls,
3067 GNUNET_TRANSPORT_NotifyConnect connect_cb,
3068 GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb,
3069 GNUNET_TRANSPORT_PeerIterateCallback peer_address_cb)
3072 connect_notify_cb = connect_cb;
3073 disconnect_notify_cb = disconnect_cb;
3074 address_change_cb = peer_address_cb;
3075 neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE);
3080 * Disconnect from the given neighbour.
3083 * @param key hash of neighbour's public key (not used)
3084 * @param value the 'struct NeighbourMapEntry' of the neighbour
3085 * @return GNUNET_OK (continue to iterate)
3088 disconnect_all_neighbours (void *cls, const GNUNET_HashCode * key, void *value)
3090 struct NeighbourMapEntry *n = value;
3092 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3093 "Disconnecting peer `%4s', %s\n",
3094 GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
3101 * Cleanup the neighbours subsystem.
3104 GST_neighbours_stop ()
3106 if (NULL == neighbours)
3108 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
3109 &disconnect_all_neighbours,
3111 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
3113 callback_cls = NULL;
3114 connect_notify_cb = NULL;
3115 disconnect_notify_cb = NULL;
3116 address_change_cb = NULL;
3120 /* end of file gnunet-service-transport_neighbours.c */