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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 100s interval we
64 * send 3 keepalives in each interval, so 3 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, 100)
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
850 * @param keep_sessions GNUNET_NO to tell plugin to terminate sessions,
851 * GNUNET_YES to keep all sessions
854 free_neighbour (struct NeighbourMapEntry *n, int keep_sessions)
856 struct MessageQueue *mq;
857 struct GNUNET_TRANSPORT_PluginFunctions *papi;
859 n->is_active = NULL; /* always free'd by its own continuation! */
861 /* fail messages currently in the queue */
862 while (NULL != (mq = n->messages_head))
864 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
865 if (NULL != mq->cont)
866 mq->cont (mq->cont_cls, GNUNET_SYSERR);
869 /* It is too late to send other peer disconnect notifications, but at
870 least internally we need to get clean... */
871 if (GNUNET_YES == test_connected (n))
873 GNUNET_STATISTICS_set (GST_stats,
874 gettext_noop ("# peers connected"),
875 --neighbours_connected,
877 disconnect_notify_cb (callback_cls, &n->id);
880 /* FIXME-PLUGIN-API: This does not seem to guarantee that all
881 transport sessions eventually get killed due to inactivity; they
882 MUST have their own timeout logic (but at least TCP doesn't have
883 one yet). Are we sure that EVERY 'session' of a plugin is
884 actually cleaned up this way!? Note that if we are switching
885 between two TCP sessions to the same peer, the existing plugin
886 API gives us not even the means to selectively kill only one of
887 them! Killing all sessions like this seems to be very, very
889 if ((GNUNET_NO == keep_sessions) &&
890 (NULL != n->primary_address.address) &&
891 (NULL != (papi = GST_plugins_find (n->primary_address.address->transport_name))))
892 papi->disconnect (papi->cls, &n->id);
894 n->state = S_DISCONNECT_FINISHED;
896 GNUNET_assert (GNUNET_YES ==
897 GNUNET_CONTAINER_multihashmap_remove (neighbours,
898 &n->id.hashPubKey, n));
900 /* cut transport-level connection */
901 free_address (&n->primary_address);
902 free_address (&n->alternative_address);
904 // FIXME-ATS-API: we might want to be more specific about
905 // which states we do this from in the future (ATS should
906 // have given us a 'suggest_address' handle, and if we have
907 // such a handle, we should cancel the operation here!
908 GNUNET_ATS_suggest_address_cancel (GST_ats, &n->id);
910 if (GNUNET_SCHEDULER_NO_TASK != n->task)
912 GNUNET_SCHEDULER_cancel (n->task);
913 n->task = GNUNET_SCHEDULER_NO_TASK;
915 /* free rest of memory */
921 * Transmit a message using the current session of the given
924 * @param n entry for the recipient
925 * @param msgbuf buffer to transmit
926 * @param msgbuf_size number of bytes in buffer
927 * @param priority transmission priority
928 * @param timeout transmission timeout
929 * @param cont continuation to call when finished (can be NULL)
930 * @param cont_cls closure for cont
933 send_with_session (struct NeighbourMapEntry *n,
934 const char *msgbuf, size_t msgbuf_size,
936 struct GNUNET_TIME_Relative timeout,
937 GNUNET_TRANSPORT_TransmitContinuation cont,
940 struct GNUNET_TRANSPORT_PluginFunctions *papi;
942 GNUNET_assert (n->primary_address.session != NULL);
943 if ( ( (NULL == (papi = GST_plugins_find (n->primary_address.address->transport_name))) ||
944 (-1 == papi->send (papi->cls,
945 n->primary_address.session,
951 cont (cont_cls, &n->id, GNUNET_SYSERR);
952 GNUNET_break (NULL != papi);
957 * Master task run for every neighbour. Performs all of the time-related
958 * activities (keep alive, send next message, disconnect if idle, finish
959 * clean up after disconnect).
961 * @param cls the 'struct NeighbourMapEntry' for which we are running
962 * @param tc scheduler context (unused)
965 master_task (void *cls,
966 const struct GNUNET_SCHEDULER_TaskContext *tc);
970 * Function called when the 'DISCONNECT' message has been sent by the
971 * plugin. Frees the neighbour --- if the entry still exists.
974 * @param target identity of the neighbour that was disconnected
975 * @param result GNUNET_OK if the disconnect got out successfully
978 send_disconnect_cont (void *cls, const struct GNUNET_PeerIdentity *target,
981 struct NeighbourMapEntry *n;
983 n = lookup_neighbour (target);
985 return; /* already gone */
986 if (S_DISCONNECT != n->state)
987 return; /* have created a fresh entry since */
988 n->state = S_DISCONNECT;
989 GNUNET_SCHEDULER_cancel (n->task);
990 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
995 * Transmit a DISCONNECT message to the other peer.
997 * @param n neighbour to send DISCONNECT message.
1000 send_disconnect (struct NeighbourMapEntry *n)
1002 struct SessionDisconnectMessage disconnect_msg;
1004 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1005 "Sending DISCONNECT message to peer `%4s'\n",
1006 GNUNET_i2s (&n->id));
1007 disconnect_msg.header.size = htons (sizeof (struct SessionDisconnectMessage));
1008 disconnect_msg.header.type =
1009 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1010 disconnect_msg.reserved = htonl (0);
1011 disconnect_msg.purpose.size =
1012 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
1013 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
1014 sizeof (struct GNUNET_TIME_AbsoluteNBO));
1015 disconnect_msg.purpose.purpose =
1016 htonl (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1017 disconnect_msg.timestamp =
1018 GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1019 disconnect_msg.public_key = GST_my_public_key;
1020 GNUNET_assert (GNUNET_OK ==
1021 GNUNET_CRYPTO_rsa_sign (GST_my_private_key,
1022 &disconnect_msg.purpose,
1023 &disconnect_msg.signature));
1025 send_with_session (n,
1026 (const char *) &disconnect_msg, sizeof (disconnect_msg),
1027 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
1028 &send_disconnect_cont, NULL);
1029 GNUNET_STATISTICS_update (GST_stats,
1031 ("# DISCONNECT messages sent"), 1,
1037 * Disconnect from the given neighbour, clean up the record.
1039 * @param n neighbour to disconnect from
1042 disconnect_neighbour (struct NeighbourMapEntry *n)
1044 /* depending on state, notify neighbour and/or upper layers of this peer
1048 case S_NOT_CONNECTED:
1050 case S_INIT_BLACKLIST:
1051 /* other peer is completely unaware of us, no need to send DISCONNECT */
1052 n->state = S_DISCONNECT_FINISHED;
1053 free_neighbour (n, GNUNET_NO);
1055 case S_CONNECT_SENT:
1056 send_disconnect (n);
1057 n->state = S_DISCONNECT;
1059 case S_CONNECT_RECV_ATS:
1060 case S_CONNECT_RECV_BLACKLIST:
1061 /* we never ACK'ed the other peer's request, no need to send DISCONNECT */
1062 n->state = S_DISCONNECT_FINISHED;
1063 free_neighbour (n, GNUNET_NO);
1065 case S_CONNECT_RECV_ACK:
1066 /* we DID ACK the other peer's request, must send DISCONNECT */
1067 send_disconnect (n);
1068 n->state = S_DISCONNECT;
1071 case S_RECONNECT_BLACKLIST:
1072 case S_RECONNECT_SENT:
1073 case S_CONNECTED_SWITCHING_BLACKLIST:
1074 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1075 /* we are currently connected, need to send disconnect and do
1076 internal notifications and update statistics */
1077 send_disconnect (n);
1078 GNUNET_STATISTICS_set (GST_stats,
1079 gettext_noop ("# peers connected"),
1080 --neighbours_connected,
1082 disconnect_notify_cb (callback_cls, &n->id);
1083 n->state = S_DISCONNECT;
1085 case S_RECONNECT_ATS:
1086 /* ATS address request timeout, disconnect without sending disconnect message */
1087 GNUNET_STATISTICS_set (GST_stats,
1088 gettext_noop ("# peers connected"),
1089 --neighbours_connected,
1091 disconnect_notify_cb (callback_cls, &n->id);
1092 n->state = S_DISCONNECT;
1095 /* already disconnected, ignore */
1097 case S_DISCONNECT_FINISHED:
1098 /* already cleaned up, how did we get here!? */
1102 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1106 /* schedule timeout to clean up */
1107 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1108 GNUNET_SCHEDULER_cancel (n->task);
1109 n->task = GNUNET_SCHEDULER_add_delayed (DISCONNECT_SENT_TIMEOUT,
1115 * We're done with our transmission attempt, continue processing.
1117 * @param cls the 'struct MessageQueue' of the message
1118 * @param receiver intended receiver
1119 * @param success whether it worked or not
1122 transmit_send_continuation (void *cls,
1123 const struct GNUNET_PeerIdentity *receiver,
1126 struct MessageQueue *mq = cls;
1127 struct NeighbourMapEntry *n;
1129 if (NULL == (n = lookup_neighbour (receiver)))
1130 return; /* disconnect or other error while transmitting, can happen */
1131 if (n->is_active == mq)
1133 /* this is still "our" neighbour, remove us from its queue
1134 and allow it to send the next message now */
1135 n->is_active = NULL;
1136 GNUNET_SCHEDULER_cancel (n->task);
1137 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1139 GNUNET_assert (bytes_in_send_queue >= mq->message_buf_size);
1140 bytes_in_send_queue -= mq->message_buf_size;
1141 GNUNET_STATISTICS_set (GST_stats,
1143 ("# bytes in message queue for other peers"),
1144 bytes_in_send_queue, GNUNET_NO);
1145 if (GNUNET_OK == success)
1146 GNUNET_STATISTICS_update (GST_stats,
1148 ("# messages transmitted to other peers"),
1151 GNUNET_STATISTICS_update (GST_stats,
1153 ("# transmission failures for messages to other peers"),
1155 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1156 "Sending message to `%s' of type %u was a %s\n",
1157 GNUNET_i2s (receiver),
1158 ntohs (((struct GNUNET_MessageHeader *) mq->message_buf)->type),
1159 (success == GNUNET_OK) ? "success" : "FAILURE");
1160 if (NULL != mq->cont)
1161 mq->cont (mq->cont_cls, success);
1167 * Check the message list for the given neighbour and if we can
1168 * send a message, do so. This function should only be called
1169 * if the connection is at least generally ready for transmission.
1170 * While we will only send one message at a time, no bandwidth
1171 * quota management is performed here. If a message was given to
1172 * the plugin, the continuation will automatically re-schedule
1173 * the 'master' task once the next message might be transmitted.
1175 * @param n target peer for which to transmit
1178 try_transmission_to_peer (struct NeighbourMapEntry *n)
1180 struct MessageQueue *mq;
1181 struct GNUNET_TIME_Relative timeout;
1183 if (NULL == n->primary_address.address)
1185 /* no address, why are we here? */
1189 if ((0 == n->primary_address.address->address_length) &&
1190 (NULL == n->primary_address.session))
1192 /* no address, why are we here? */
1196 if (NULL != n->is_active)
1198 /* transmission already pending */
1202 /* timeout messages from the queue that are past their due date */
1203 while (NULL != (mq = n->messages_head))
1205 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1206 if (timeout.rel_value > 0)
1208 GNUNET_STATISTICS_update (GST_stats,
1210 ("# messages timed out while in transport queue"),
1212 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
1214 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR); /* timeout */
1217 return; /* no more messages */
1218 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
1220 send_with_session (n,
1221 mq->message_buf, mq->message_buf_size,
1222 0 /* priority */, timeout,
1223 &transmit_send_continuation, mq);
1228 * Send keepalive message to the neighbour. Must only be called
1229 * if we are on 'connected' state. Will internally determine
1230 * if a keepalive is truly needed (so can always be called).
1232 * @param n neighbour that went idle and needs a keepalive
1235 send_keepalive (struct NeighbourMapEntry *n)
1237 struct GNUNET_MessageHeader m;
1239 GNUNET_assert (S_CONNECTED == n->state);
1240 if (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time).rel_value > 0)
1241 return; /* no keepalive needed at this time */
1242 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1243 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE);
1244 send_with_session (n,
1245 (const void *) &m, sizeof (m),
1246 UINT32_MAX /* priority */,
1247 KEEPALIVE_FREQUENCY,
1249 GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# keepalives sent"), 1,
1251 n->expect_latency_response = GNUNET_YES;
1252 n->last_keep_alive_time = GNUNET_TIME_absolute_get ();
1253 n->keep_alive_time = GNUNET_TIME_relative_to_absolute (KEEPALIVE_FREQUENCY);
1258 * Keep the connection to the given neighbour alive longer,
1259 * we received a KEEPALIVE (or equivalent); send a response.
1261 * @param neighbour neighbour to keep alive (by sending keep alive response)
1264 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
1266 struct NeighbourMapEntry *n;
1267 struct GNUNET_MessageHeader m;
1269 if (NULL == (n = lookup_neighbour (neighbour)))
1271 GNUNET_STATISTICS_update (GST_stats,
1273 ("# KEEPALIVE messages discarded (peer unknown)"),
1277 if (NULL == n->primary_address.session)
1279 GNUNET_STATISTICS_update (GST_stats,
1281 ("# KEEPALIVE messages discarded (no session)"),
1285 /* send reply to allow neighbour to measure latency */
1286 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1287 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE_RESPONSE);
1288 send_with_session(n,
1289 (const void *) &m, sizeof (m),
1290 UINT32_MAX /* priority */,
1291 KEEPALIVE_FREQUENCY,
1297 * We received a KEEP_ALIVE_RESPONSE message and use this to calculate
1298 * latency to this peer. Pass the updated information (existing ats
1299 * plus calculated latency) to ATS.
1301 * @param neighbour neighbour to keep alive
1302 * @param ats performance data
1303 * @param ats_count number of entries in ats
1306 GST_neighbours_keepalive_response (const struct GNUNET_PeerIdentity *neighbour,
1307 const struct GNUNET_ATS_Information *ats,
1310 struct NeighbourMapEntry *n;
1312 struct GNUNET_ATS_Information ats_new[ats_count + 1];
1314 if (NULL == (n = lookup_neighbour (neighbour)))
1316 GNUNET_STATISTICS_update (GST_stats,
1318 ("# KEEPALIVE_RESPONSE messages discarded (not connected)"),
1322 if ( (S_CONNECTED != n->state) ||
1323 (GNUNET_YES != n->expect_latency_response) )
1325 GNUNET_STATISTICS_update (GST_stats,
1327 ("# KEEPALIVE_RESPONSE messages discarded (not expected)"),
1331 n->expect_latency_response = GNUNET_NO;
1332 n->latency = GNUNET_TIME_absolute_get_duration (n->last_keep_alive_time);
1333 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1334 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1335 "Latency for peer `%s' is %llu ms\n",
1336 GNUNET_i2s (&n->id), n->latency.rel_value);
1337 memcpy (ats_new, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1338 /* append latency */
1339 ats_new[ats_count].type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
1340 if (n->latency.rel_value > UINT32_MAX)
1341 latency = UINT32_MAX;
1343 latency = n->latency.rel_value;
1344 ats_new[ats_count].value = htonl (latency);
1345 GNUNET_ATS_address_update (GST_ats,
1346 n->primary_address.address,
1347 n->primary_address.session, ats_new,
1353 * We have received a message from the given sender. How long should
1354 * we delay before receiving more? (Also used to keep the peer marked
1357 * @param sender sender of the message
1358 * @param size size of the message
1359 * @param do_forward set to GNUNET_YES if the message should be forwarded to clients
1360 * GNUNET_NO if the neighbour is not connected or violates the quota,
1361 * GNUNET_SYSERR if the connection is not fully up yet
1362 * @return how long to wait before reading more from this sender
1364 struct GNUNET_TIME_Relative
1365 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
1366 *sender, ssize_t size, int *do_forward)
1368 struct NeighbourMapEntry *n;
1369 struct GNUNET_TIME_Relative ret;
1371 if (NULL == neighbours)
1373 *do_forward = GNUNET_NO;
1374 return GNUNET_TIME_UNIT_FOREVER_REL; /* This can happen during shutdown */
1376 if (NULL == (n = lookup_neighbour (sender)))
1378 GST_neighbours_try_connect (sender);
1379 if (NULL == (n = lookup_neighbour (sender)))
1381 GNUNET_STATISTICS_update (GST_stats,
1383 ("# messages discarded due to lack of neighbour record"),
1385 *do_forward = GNUNET_NO;
1386 return GNUNET_TIME_UNIT_ZERO;
1389 if (! test_connected (n))
1391 *do_forward = GNUNET_SYSERR;
1392 return GNUNET_TIME_UNIT_ZERO;
1394 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
1396 n->quota_violation_count++;
1397 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1398 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
1399 n->in_tracker.available_bytes_per_s__,
1400 n->quota_violation_count);
1401 /* Discount 32k per violation */
1402 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
1406 if (n->quota_violation_count > 0)
1408 /* try to add 32k back */
1409 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
1410 n->quota_violation_count--;
1413 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
1415 GNUNET_STATISTICS_update (GST_stats,
1417 ("# bandwidth quota violations by other peers"),
1419 *do_forward = GNUNET_NO;
1420 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
1422 *do_forward = GNUNET_YES;
1423 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 32 * 1024);
1424 if (ret.rel_value > 0)
1426 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1427 "Throttling read (%llu bytes excess at %u b/s), waiting %llu ms before reading more.\n",
1428 (unsigned long long) n->in_tracker.
1429 consumption_since_last_update__,
1430 (unsigned int) n->in_tracker.available_bytes_per_s__,
1431 (unsigned long long) ret.rel_value);
1432 GNUNET_STATISTICS_update (GST_stats,
1433 gettext_noop ("# ms throttling suggested"),
1434 (int64_t) ret.rel_value, GNUNET_NO);
1441 * Transmit a message to the given target using the active connection.
1443 * @param target destination
1444 * @param msg message to send
1445 * @param msg_size number of bytes in msg
1446 * @param timeout when to fail with timeout
1447 * @param cont function to call when done
1448 * @param cont_cls closure for 'cont'
1451 GST_neighbours_send (const struct GNUNET_PeerIdentity *target, const void *msg,
1452 size_t msg_size, struct GNUNET_TIME_Relative timeout,
1453 GST_NeighbourSendContinuation cont, void *cont_cls)
1455 struct NeighbourMapEntry *n;
1456 struct MessageQueue *mq;
1458 /* All ove these cases should never happen; they are all API violations.
1459 But we check anyway, just to be sure. */
1460 if (NULL == (n = lookup_neighbour (target)))
1464 cont (cont_cls, GNUNET_SYSERR);
1467 if (GNUNET_YES != test_connected (n))
1471 cont (cont_cls, GNUNET_SYSERR);
1474 bytes_in_send_queue += msg_size;
1475 GNUNET_STATISTICS_set (GST_stats,
1477 ("# bytes in message queue for other peers"),
1478 bytes_in_send_queue, GNUNET_NO);
1479 mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
1481 mq->cont_cls = cont_cls;
1482 memcpy (&mq[1], msg, msg_size);
1483 mq->message_buf = (const char *) &mq[1];
1484 mq->message_buf_size = msg_size;
1485 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1486 GNUNET_CONTAINER_DLL_insert_tail (n->messages_head, n->messages_tail, mq);
1487 if ( (NULL != n->is_active) ||
1488 ( (NULL == n->primary_address.session) && (NULL == n->primary_address.address)) )
1490 GNUNET_SCHEDULER_cancel (n->task);
1491 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1496 * Send a SESSION_CONNECT message via the given address.
1498 * @param na address to use
1501 send_session_connect (struct NeighbourAddress *na)
1503 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1504 struct SessionConnectMessage connect_msg;
1506 if (NULL == (papi = GST_plugins_find (na->address->transport_name)))
1511 if (NULL == na->session)
1512 na->session = papi->get_session (papi->cls, na->address);
1513 if (NULL == na->session)
1518 na->connect_timestamp = GNUNET_TIME_absolute_get ();
1519 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1520 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
1521 connect_msg.reserved = htonl (0);
1522 connect_msg.timestamp = GNUNET_TIME_absolute_hton (na->connect_timestamp);
1523 (void) papi->send (papi->cls,
1525 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1527 GNUNET_TIME_UNIT_FOREVER_REL,
1533 * Send a SESSION_CONNECT_ACK message via the given address.
1535 * @param address address to use
1536 * @param session session to use
1537 * @param timestamp timestamp to use for the ACK message
1540 send_session_connect_ack_message (const struct GNUNET_HELLO_Address *address,
1541 struct Session *session,
1542 struct GNUNET_TIME_Absolute timestamp)
1544 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1545 struct SessionConnectMessage connect_msg;
1547 if (NULL == (papi = GST_plugins_find (address->transport_name)))
1552 if (NULL == session)
1553 session = papi->get_session (papi->cls, address);
1554 if (NULL == session)
1559 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1560 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT_ACK);
1561 connect_msg.reserved = htonl (0);
1562 connect_msg.timestamp = GNUNET_TIME_absolute_hton (timestamp);
1563 (void) papi->send (papi->cls,
1565 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1567 GNUNET_TIME_UNIT_FOREVER_REL,
1573 * Create a fresh entry in the neighbour map for the given peer
1575 * @param peer peer to create an entry for
1576 * @return new neighbour map entry
1578 static struct NeighbourMapEntry *
1579 setup_neighbour (const struct GNUNET_PeerIdentity *peer)
1581 struct NeighbourMapEntry *n;
1583 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1584 "Creating new neighbour entry for `%s'\n",
1586 n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
1588 n->state = S_NOT_CONNECTED;
1589 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
1590 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
1591 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
1592 MAX_BANDWIDTH_CARRY_S);
1593 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1594 GNUNET_assert (GNUNET_OK ==
1595 GNUNET_CONTAINER_multihashmap_put (neighbours,
1596 &n->id.hashPubKey, n,
1597 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1603 * Check if the two given addresses are the same.
1604 * Actually only checks if the sessions are non-NULL
1605 * (which they should be) and then if they are identical;
1606 * the actual addresses don't matter if the session
1607 * pointers match anyway, and we must have session pointers
1610 * @param a1 first address to compare
1611 * @param a2 other address to compare
1612 * @return GNUNET_NO if the addresses do not match, GNUNET_YES if they do match
1615 address_matches (const struct NeighbourAddress *a1,
1616 const struct NeighbourAddress *a2)
1618 if ( (NULL == a1->session) ||
1619 (NULL == a2->session) )
1624 return (a1->session == a2->session) ? GNUNET_YES : GNUNET_NO;
1629 * Try to create a connection to the given target (eventually).
1631 * @param target peer to try to connect to
1634 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
1636 struct NeighbourMapEntry *n;
1638 if (NULL == neighbours)
1639 return; /* during shutdown, do nothing */
1640 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1641 "Asked to connect to peer `%s'\n",
1642 GNUNET_i2s (target));
1644 memcmp (target, &GST_my_identity, sizeof (struct GNUNET_PeerIdentity)))
1646 /* refuse to connect to myself */
1647 /* FIXME: can this happen? Is this not an API violation? */
1648 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1649 "Refusing to try to connect to myself.\n");
1652 n = lookup_neighbour (target);
1657 case S_NOT_CONNECTED:
1658 /* this should not be possible */
1660 free_neighbour (n, GNUNET_NO);
1663 case S_INIT_BLACKLIST:
1664 case S_CONNECT_SENT:
1665 case S_CONNECT_RECV_ATS:
1666 case S_CONNECT_RECV_BLACKLIST:
1667 case S_CONNECT_RECV_ACK:
1668 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1669 "Ignoring request to try to connect to `%s', already trying!\n",
1670 GNUNET_i2s (target));
1671 return; /* already trying */
1673 case S_RECONNECT_ATS:
1674 case S_RECONNECT_BLACKLIST:
1675 case S_RECONNECT_SENT:
1676 case S_CONNECTED_SWITCHING_BLACKLIST:
1677 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1678 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1679 "Ignoring request to try to connect, already connected to `%s'!\n",
1680 GNUNET_i2s (target));
1681 return; /* already connected */
1683 /* get rid of remains, ready to re-try immediately */
1684 free_neighbour (n, GNUNET_NO);
1686 case S_DISCONNECT_FINISHED:
1687 /* should not be possible */
1690 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1692 free_neighbour (n, GNUNET_NO);
1696 n = setup_neighbour (target);
1697 n->state = S_INIT_ATS;
1698 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1700 GNUNET_ATS_reset_backoff (GST_ats, target);
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 */
1740 free_neighbour (n, GNUNET_NO);
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_reset_backoff (GST_ats, peer);
1811 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1814 case S_CONNECT_RECV_ACK:
1815 /* waiting on SESSION_ACK, send ACK if one is pending */
1816 if ( (GNUNET_OK == result) &&
1817 (1 == n->send_connect_ack) )
1819 n->send_connect_ack = 2;
1820 send_session_connect_ack_message (n->primary_address.address,
1821 n->primary_address.session,
1822 n->connect_ack_timestamp);
1826 /* already connected, don't care about blacklist */
1828 case S_RECONNECT_ATS:
1829 /* still waiting on ATS suggestion, don't care about blacklist */
1831 case S_RECONNECT_BLACKLIST:
1832 if ( (GNUNET_OK == result) &&
1833 (1 == n->send_connect_ack) )
1835 n->send_connect_ack = 2;
1836 send_session_connect_ack_message (bcc->na.address,
1838 n->connect_ack_timestamp);
1840 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1841 break; /* result for an address we currently don't care about */
1842 if (GNUNET_OK == result)
1844 send_session_connect (&n->primary_address);
1845 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
1846 n->state = S_RECONNECT_SENT;
1850 GNUNET_ATS_address_destroyed (GST_ats,
1853 n->state = S_RECONNECT_ATS;
1854 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1855 // FIXME: do we need to ask ATS again for suggestions?
1856 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1859 case S_RECONNECT_SENT:
1860 /* waiting on CONNECT_ACK, don't care about blacklist */
1861 if ( (GNUNET_OK == result) &&
1862 (1 == n->send_connect_ack) )
1864 n->send_connect_ack = 2;
1865 send_session_connect_ack_message (n->primary_address.address,
1866 n->primary_address.session,
1867 n->connect_ack_timestamp);
1870 case S_CONNECTED_SWITCHING_BLACKLIST:
1871 if (GNUNET_YES != address_matches (&bcc->na, &n->alternative_address))
1872 break; /* result for an address we currently don't care about */
1873 if (GNUNET_OK == result)
1875 send_session_connect (&n->alternative_address);
1876 n->state = S_CONNECTED_SWITCHING_CONNECT_SENT;
1880 GNUNET_ATS_address_destroyed (GST_ats,
1883 free_address (&n->alternative_address);
1884 n->state = S_CONNECTED;
1887 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1888 /* waiting on CONNECT_ACK, don't care about blacklist */
1889 if ( (GNUNET_OK == result) &&
1890 (1 == n->send_connect_ack) )
1892 n->send_connect_ack = 2;
1893 send_session_connect_ack_message (n->primary_address.address,
1894 n->primary_address.session,
1895 n->connect_ack_timestamp);
1899 /* Nothing to do here, ATS will already do what can be done */
1901 case S_DISCONNECT_FINISHED:
1902 /* should not be possible */
1906 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1908 free_neighbour (n, GNUNET_NO);
1912 GNUNET_HELLO_address_free (bcc->na.address);
1913 GNUNET_CONTAINER_DLL_remove (bc_head,
1921 * We want to know if connecting to a particular peer via
1922 * a particular address is allowed. Check it!
1924 * @param peer identity of the peer to switch the address for
1925 * @param ts time at which the check was initiated
1926 * @param address address of the other peer, NULL if other peer
1928 * @param session session to use (or NULL)
1929 * @param ats performance data
1930 * @param ats_count number of entries in ats (excluding 0-termination)
1933 check_blacklist (const struct GNUNET_PeerIdentity *peer,
1934 struct GNUNET_TIME_Absolute ts,
1935 const struct GNUNET_HELLO_Address *address,
1936 struct Session *session,
1937 const struct GNUNET_ATS_Information *ats,
1940 struct BlackListCheckContext *bcc;
1941 struct GST_BlacklistCheck *bc;
1944 GNUNET_malloc (sizeof (struct BlackListCheckContext) +
1945 sizeof (struct GNUNET_ATS_Information) * ats_count);
1946 bcc->ats_count = ats_count;
1947 bcc->na.address = GNUNET_HELLO_address_copy (address);
1948 bcc->na.session = session;
1949 bcc->na.connect_timestamp = ts;
1950 bcc->ats = (struct GNUNET_ATS_Information *) &bcc[1];
1951 memcpy (bcc->ats, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1952 GNUNET_CONTAINER_DLL_insert (bc_head,
1955 if (NULL != (bc = GST_blacklist_test_allowed (peer,
1956 address->transport_name,
1957 &handle_test_blacklist_cont, bcc)))
1959 /* if NULL == bc, 'cont' was already called and 'bcc' already free'd, so
1960 we must only store 'bc' if 'bc' is non-NULL... */
1965 * We received a 'SESSION_CONNECT' message from the other peer.
1966 * Consider switching to it.
1968 * @param message possibly a 'struct SessionConnectMessage' (check format)
1969 * @param peer identity of the peer to switch the address for
1970 * @param address address of the other peer, NULL if other peer
1972 * @param session session to use (or NULL)
1973 * @param ats performance data
1974 * @param ats_count number of entries in ats (excluding 0-termination)
1977 GST_neighbours_handle_connect (const struct GNUNET_MessageHeader *message,
1978 const struct GNUNET_PeerIdentity *peer,
1979 const struct GNUNET_HELLO_Address *address,
1980 struct Session *session,
1981 const struct GNUNET_ATS_Information *ats,
1984 const struct SessionConnectMessage *scm;
1985 struct NeighbourMapEntry *n;
1986 struct GNUNET_TIME_Absolute ts;
1988 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1989 "Received CONNECT message from peer `%s'\n",
1991 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
1993 GNUNET_break_op (0);
1996 if (NULL == neighbours)
1997 return; /* we're shutting down */
1998 scm = (const struct SessionConnectMessage *) message;
1999 GNUNET_break_op (0 == ntohl (scm->reserved));
2000 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2001 n = lookup_neighbour (peer);
2003 n = setup_neighbour (peer);
2004 n->send_connect_ack = 1;
2005 n->connect_ack_timestamp = ts;
2008 case S_NOT_CONNECTED:
2009 n->state = S_CONNECT_RECV_ATS;
2010 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2011 GNUNET_ATS_reset_backoff (GST_ats, peer);
2012 GNUNET_ATS_suggest_address (GST_ats, peer);
2013 check_blacklist (peer, ts, address, session, ats, ats_count);
2016 case S_INIT_BLACKLIST:
2017 case S_CONNECT_SENT:
2018 case S_CONNECT_RECV_ATS:
2019 case S_CONNECT_RECV_BLACKLIST:
2020 case S_CONNECT_RECV_ACK:
2021 /* It can never hurt to have an alternative address in the above cases,
2022 see if it is allowed */
2023 check_blacklist (peer, ts, address, session, ats, ats_count);
2026 /* we are already connected and can thus send the ACK immediately;
2027 still, it can never hurt to have an alternative address, so also
2028 tell ATS about it */
2029 GNUNET_assert (NULL != n->primary_address.address);
2030 GNUNET_assert (NULL != n->primary_address.session);
2031 n->send_connect_ack = 0;
2032 send_session_connect_ack_message (n->primary_address.address,
2033 n->primary_address.session, ts);
2034 check_blacklist (peer, ts, address, session, ats, ats_count);
2036 case S_RECONNECT_ATS:
2037 case S_RECONNECT_BLACKLIST:
2038 case S_RECONNECT_SENT:
2039 /* It can never hurt to have an alternative address in the above cases,
2040 see if it is allowed */
2041 check_blacklist (peer, ts, address, session, ats, ats_count);
2043 case S_CONNECTED_SWITCHING_BLACKLIST:
2044 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2045 /* we are already connected and can thus send the ACK immediately;
2046 still, it can never hurt to have an alternative address, so also
2047 tell ATS about it */
2048 GNUNET_assert (NULL != n->primary_address.address);
2049 GNUNET_assert (NULL != n->primary_address.session);
2050 n->send_connect_ack = 0;
2051 send_session_connect_ack_message (n->primary_address.address,
2052 n->primary_address.session, ts);
2053 check_blacklist (peer, ts, address, session, ats, ats_count);
2056 /* get rid of remains without terminating sessions, ready to re-try */
2057 free_neighbour (n, GNUNET_YES);
2058 n = setup_neighbour (peer);
2059 n->state = S_CONNECT_RECV_ATS;
2060 GNUNET_ATS_reset_backoff (GST_ats, peer);
2061 GNUNET_ATS_suggest_address (GST_ats, peer);
2063 case S_DISCONNECT_FINISHED:
2064 /* should not be possible */
2068 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2070 free_neighbour (n, GNUNET_NO);
2077 * For an existing neighbour record, set the active connection to
2078 * use the given address.
2080 * @param peer identity of the peer to switch the address for
2081 * @param address address of the other peer, NULL if other peer
2083 * @param session session to use (or NULL)
2084 * @param ats performance data
2085 * @param ats_count number of entries in ats
2086 * @param bandwidth_in inbound quota to be used when connection is up
2087 * @param bandwidth_out outbound quota to be used when connection is up
2090 GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
2091 const struct GNUNET_HELLO_Address *address,
2092 struct Session *session,
2093 const struct GNUNET_ATS_Information *ats,
2095 struct GNUNET_BANDWIDTH_Value32NBO
2097 struct GNUNET_BANDWIDTH_Value32NBO
2100 struct NeighbourMapEntry *n;
2101 struct GNUNET_TRANSPORT_PluginFunctions *papi;
2103 GNUNET_assert (address->transport_name != NULL);
2104 if (NULL == (n = lookup_neighbour (peer)))
2107 /* Obtain an session for this address from plugin */
2108 if (NULL == (papi = GST_plugins_find (address->transport_name)))
2110 /* we don't have the plugin for this address */
2111 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2114 if ((NULL == session) && (0 == address->address_length))
2117 if (strlen (address->transport_name) > 0)
2118 GNUNET_ATS_address_destroyed (GST_ats, address, session);
2121 if (NULL == session)
2122 session = papi->get_session (papi->cls, address);
2123 if (NULL == session)
2125 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2126 "Failed to obtain new session for peer `%s' and address '%s'\n",
2127 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
2128 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2131 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2132 "ATS tells us to switch to address '%s' for peer `%s'\n",
2133 (address->address_length != 0) ? GST_plugins_a2s (address): "<inbound>",
2137 case S_NOT_CONNECTED:
2139 free_neighbour (n, GNUNET_NO);
2142 set_address (&n->primary_address,
2143 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2144 n->state = S_INIT_BLACKLIST;
2145 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2146 check_blacklist (&n->id,
2147 n->connect_ack_timestamp,
2148 address, session, ats, ats_count);
2150 case S_INIT_BLACKLIST:
2151 /* ATS suggests a different address, switch again */
2152 set_address (&n->primary_address,
2153 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2154 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2155 check_blacklist (&n->id,
2156 n->connect_ack_timestamp,
2157 address, session, ats, ats_count);
2159 case S_CONNECT_SENT:
2160 /* ATS suggests a different address, switch again */
2161 set_address (&n->primary_address,
2162 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2163 n->state = S_INIT_BLACKLIST;
2164 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2165 check_blacklist (&n->id,
2166 n->connect_ack_timestamp,
2167 address, session, ats, ats_count);
2169 case S_CONNECT_RECV_ATS:
2170 set_address (&n->primary_address,
2171 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2172 n->state = S_CONNECT_RECV_BLACKLIST;
2173 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2174 check_blacklist (&n->id,
2175 n->connect_ack_timestamp,
2176 address, session, ats, ats_count);
2178 case S_CONNECT_RECV_BLACKLIST:
2179 case S_CONNECT_RECV_ACK:
2180 /* ATS asks us to switch while we were trying to connect; switch to new
2181 address and check blacklist again */
2182 set_address (&n->primary_address,
2183 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2184 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2185 check_blacklist (&n->id,
2186 n->connect_ack_timestamp,
2187 address, session, ats, ats_count);
2190 GNUNET_assert (NULL != n->primary_address.address);
2191 GNUNET_assert (NULL != n->primary_address.session);
2192 if (n->primary_address.session == session)
2194 /* not an address change, just a quota change */
2195 set_address (&n->primary_address,
2196 address, session, bandwidth_in, bandwidth_out, GNUNET_YES);
2199 /* ATS asks us to switch a life connection; see if we can get
2200 a CONNECT_ACK on it before we actually do this! */
2201 set_address (&n->alternative_address,
2202 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2203 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2204 check_blacklist (&n->id,
2205 GNUNET_TIME_absolute_get (),
2206 address, session, ats, ats_count);
2208 case S_RECONNECT_ATS:
2209 set_address (&n->primary_address,
2210 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2211 n->state = S_RECONNECT_BLACKLIST;
2212 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2213 check_blacklist (&n->id,
2214 n->connect_ack_timestamp,
2215 address, session, ats, ats_count);
2217 case S_RECONNECT_BLACKLIST:
2218 /* ATS asks us to switch while we were trying to reconnect; switch to new
2219 address and check blacklist again */
2220 set_address (&n->primary_address,
2221 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2222 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2223 check_blacklist (&n->id,
2224 n->connect_ack_timestamp,
2225 address, session, ats, ats_count);
2227 case S_RECONNECT_SENT:
2228 /* ATS asks us to switch while we were trying to reconnect; switch to new
2229 address and check blacklist again */
2230 set_address (&n->primary_address,
2231 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2232 n->state = S_RECONNECT_BLACKLIST;
2233 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2234 check_blacklist (&n->id,
2235 n->connect_ack_timestamp,
2236 address, session, ats, ats_count);
2238 case S_CONNECTED_SWITCHING_BLACKLIST:
2239 if (n->primary_address.session == session)
2241 /* ATS switches back to still-active session */
2242 free_address (&n->alternative_address);
2243 n->state = S_CONNECTED;
2246 /* ATS asks us to switch a life connection, update blacklist check */
2247 set_address (&n->alternative_address,
2248 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2249 check_blacklist (&n->id,
2250 GNUNET_TIME_absolute_get (),
2251 address, session, ats, ats_count);
2253 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2254 if (n->primary_address.session == session)
2256 /* ATS switches back to still-active session */
2257 free_address (&n->alternative_address);
2258 n->state = S_CONNECTED;
2261 /* ATS asks us to switch a life connection, update blacklist check */
2262 set_address (&n->alternative_address,
2263 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2264 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2265 check_blacklist (&n->id,
2266 GNUNET_TIME_absolute_get (),
2267 address, session, ats, ats_count);
2270 /* not going to switch addresses while disconnecting */
2272 case S_DISCONNECT_FINISHED:
2276 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2284 * Master task run for every neighbour. Performs all of the time-related
2285 * activities (keep alive, send next message, disconnect if idle, finish
2286 * clean up after disconnect).
2288 * @param cls the 'struct NeighbourMapEntry' for which we are running
2289 * @param tc scheduler context (unused)
2292 master_task (void *cls,
2293 const struct GNUNET_SCHEDULER_TaskContext *tc)
2295 struct NeighbourMapEntry *n = cls;
2296 struct GNUNET_TIME_Relative delay;
2298 n->task = GNUNET_SCHEDULER_NO_TASK;
2299 delay = GNUNET_TIME_absolute_get_remaining (n->timeout);
2302 case S_NOT_CONNECTED:
2303 /* invalid state for master task, clean up */
2305 n->state = S_DISCONNECT_FINISHED;
2306 free_neighbour (n, GNUNET_NO);
2309 if (0 == delay.rel_value)
2311 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2312 "Connection to `%s' timed out waiting for ATS to provide address\n",
2313 GNUNET_i2s (&n->id));
2314 n->state = S_DISCONNECT_FINISHED;
2315 free_neighbour (n, GNUNET_NO);
2319 case S_INIT_BLACKLIST:
2320 if (0 == delay.rel_value)
2322 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2323 "Connection to `%s' timed out waiting for BLACKLIST to approve address\n",
2324 GNUNET_i2s (&n->id));
2325 n->state = S_DISCONNECT_FINISHED;
2326 free_neighbour (n, GNUNET_NO);
2330 case S_CONNECT_SENT:
2331 if (0 == delay.rel_value)
2333 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2334 "Connection to `%s' timed out waiting for other peer to send CONNECT_ACK\n",
2335 GNUNET_i2s (&n->id));
2336 disconnect_neighbour (n);
2340 case S_CONNECT_RECV_ATS:
2341 if (0 == delay.rel_value)
2343 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2344 "Connection to `%s' timed out waiting ATS to provide address to use for CONNECT_ACK\n",
2345 GNUNET_i2s (&n->id));
2346 n->state = S_DISCONNECT_FINISHED;
2347 free_neighbour (n, GNUNET_NO);
2351 case S_CONNECT_RECV_BLACKLIST:
2352 if (0 == delay.rel_value)
2354 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2355 "Connection to `%s' timed out waiting BLACKLIST to approve address to use for CONNECT_ACK\n",
2356 GNUNET_i2s (&n->id));
2357 n->state = S_DISCONNECT_FINISHED;
2358 free_neighbour (n, GNUNET_NO);
2362 case S_CONNECT_RECV_ACK:
2363 if (0 == delay.rel_value)
2365 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2366 "Connection to `%s' timed out waiting for other peer to send SESSION_ACK\n",
2367 GNUNET_i2s (&n->id));
2368 disconnect_neighbour (n);
2373 if (0 == delay.rel_value)
2375 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2376 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2377 GNUNET_i2s (&n->id));
2378 disconnect_neighbour (n);
2381 try_transmission_to_peer (n);
2384 case S_RECONNECT_ATS:
2385 if (0 == delay.rel_value)
2387 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2388 "Connection to `%s' timed out, waiting for ATS replacement address\n",
2389 GNUNET_i2s (&n->id));
2390 disconnect_neighbour (n);
2394 case S_RECONNECT_BLACKLIST:
2395 if (0 == delay.rel_value)
2397 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2398 "Connection to `%s' timed out, waiting for BLACKLIST to approve replacement address\n",
2399 GNUNET_i2s (&n->id));
2400 disconnect_neighbour (n);
2404 case S_RECONNECT_SENT:
2405 if (0 == delay.rel_value)
2407 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2408 "Connection to `%s' timed out, waiting for other peer to CONNECT_ACK replacement address\n",
2409 GNUNET_i2s (&n->id));
2410 disconnect_neighbour (n);
2414 case S_CONNECTED_SWITCHING_BLACKLIST:
2415 if (0 == delay.rel_value)
2417 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2418 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2419 GNUNET_i2s (&n->id));
2420 disconnect_neighbour (n);
2423 try_transmission_to_peer (n);
2426 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2427 if (0 == delay.rel_value)
2429 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2430 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs (after trying to CONNECT on alternative address)\n",
2431 GNUNET_i2s (&n->id));
2432 disconnect_neighbour (n);
2435 try_transmission_to_peer (n);
2439 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2440 "Cleaning up connection to `%s' after sending DISCONNECT\n",
2441 GNUNET_i2s (&n->id));
2442 n->state = S_DISCONNECT_FINISHED;
2443 free_neighbour (n, GNUNET_NO);
2445 case S_DISCONNECT_FINISHED:
2446 /* how did we get here!? */
2450 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2454 delay = GNUNET_TIME_relative_min (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time),
2456 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == n->task);
2457 n->task = GNUNET_SCHEDULER_add_delayed (delay,
2464 * Send a SESSION_ACK message to the neighbour to confirm that we
2465 * got his CONNECT_ACK.
2467 * @param n neighbour to send the SESSION_ACK to
2470 send_session_ack_message (struct NeighbourMapEntry *n)
2472 struct GNUNET_MessageHeader msg;
2474 msg.size = htons (sizeof (struct GNUNET_MessageHeader));
2475 msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK);
2476 (void) send_with_session(n,
2477 (const char *) &msg, sizeof (struct GNUNET_MessageHeader),
2478 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
2484 * We received a 'SESSION_CONNECT_ACK' message from the other peer.
2485 * Consider switching to it.
2487 * @param message possibly a 'struct SessionConnectMessage' (check format)
2488 * @param peer identity of the peer to switch the address for
2489 * @param address address of the other peer, NULL if other peer
2491 * @param session session to use (or NULL)
2492 * @param ats performance data
2493 * @param ats_count number of entries in ats
2496 GST_neighbours_handle_connect_ack (const struct GNUNET_MessageHeader *message,
2497 const struct GNUNET_PeerIdentity *peer,
2498 const struct GNUNET_HELLO_Address *address,
2499 struct Session *session,
2500 const struct GNUNET_ATS_Information *ats,
2503 const struct SessionConnectMessage *scm;
2504 struct GNUNET_TIME_Absolute ts;
2505 struct NeighbourMapEntry *n;
2507 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2508 "Received CONNECT_ACK message from peer `%s'\n",
2510 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2512 GNUNET_break_op (0);
2515 scm = (const struct SessionConnectMessage *) message;
2516 GNUNET_break_op (ntohl (scm->reserved) == 0);
2517 if (NULL == (n = lookup_neighbour (peer)))
2519 GNUNET_STATISTICS_update (GST_stats,
2521 ("# unexpected CONNECT_ACK messages (no peer)"),
2525 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2528 case S_NOT_CONNECTED:
2530 free_neighbour (n, GNUNET_NO);
2533 case S_INIT_BLACKLIST:
2534 GNUNET_STATISTICS_update (GST_stats,
2536 ("# unexpected CONNECT_ACK messages (not ready)"),
2539 case S_CONNECT_SENT:
2540 if (ts.abs_value != n->primary_address.connect_timestamp.abs_value)
2541 break; /* ACK does not match our original CONNECT message */
2542 n->state = S_CONNECTED;
2543 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2544 GNUNET_STATISTICS_set (GST_stats,
2545 gettext_noop ("# peers connected"),
2546 ++neighbours_connected,
2548 connect_notify_cb (callback_cls, &n->id, ats, ats_count);
2549 set_address (&n->primary_address,
2550 n->primary_address.address,
2551 n->primary_address.session,
2552 n->primary_address.bandwidth_in,
2553 n->primary_address.bandwidth_out,
2555 send_session_ack_message (n);
2557 case S_CONNECT_RECV_ATS:
2558 case S_CONNECT_RECV_BLACKLIST:
2559 case S_CONNECT_RECV_ACK:
2560 GNUNET_STATISTICS_update (GST_stats,
2562 ("# unexpected CONNECT_ACK messages (not ready)"),
2566 /* duplicate CONNECT_ACK, let's answer by duplciate SESSION_ACK just in case */
2567 send_session_ack_message (n);
2569 case S_RECONNECT_ATS:
2570 case S_RECONNECT_BLACKLIST:
2571 /* we didn't expect any CONNECT_ACK, as we are waiting for ATS
2572 to give us a new address... */
2573 GNUNET_STATISTICS_update (GST_stats,
2575 ("# unexpected CONNECT_ACK messages (waiting on ATS)"),
2578 case S_RECONNECT_SENT:
2579 /* new address worked; go back to connected! */
2580 n->state = S_CONNECTED;
2581 send_session_ack_message (n);
2583 case S_CONNECTED_SWITCHING_BLACKLIST:
2584 /* duplicate CONNECT_ACK, let's answer by duplciate SESSION_ACK just in case */
2585 send_session_ack_message (n);
2587 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2588 /* new address worked; adopt it and go back to connected! */
2589 n->state = S_CONNECTED;
2590 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2591 GNUNET_break (GNUNET_NO == n->alternative_address.ats_active);
2592 set_address (&n->primary_address,
2593 n->alternative_address.address,
2594 n->alternative_address.session,
2595 n->alternative_address.bandwidth_in,
2596 n->alternative_address.bandwidth_out,
2598 free_address (&n->alternative_address);
2599 send_session_ack_message (n);
2602 GNUNET_STATISTICS_update (GST_stats,
2604 ("# unexpected CONNECT_ACK messages (disconnecting)"),
2607 case S_DISCONNECT_FINISHED:
2611 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2619 * A session was terminated. Take note; if needed, try to get
2620 * an alternative address from ATS.
2622 * @param peer identity of the peer where the session died
2623 * @param session session that is gone
2626 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
2627 struct Session *session)
2629 struct NeighbourMapEntry *n;
2630 struct BlackListCheckContext *bcc;
2631 struct BlackListCheckContext *bcc_next;
2633 /* make sure to cancel all ongoing blacklist checks involving 'session' */
2635 while (NULL != (bcc = bcc_next))
2637 bcc_next = bcc->next;
2638 if (bcc->na.session == session)
2640 GST_blacklist_test_cancel (bcc->bc);
2641 GNUNET_HELLO_address_free (bcc->na.address);
2642 GNUNET_CONTAINER_DLL_remove (bc_head,
2648 if (NULL == (n = lookup_neighbour (peer)))
2649 return; /* can't affect us */
2650 if (session != n->primary_address.session)
2652 if (session == n->alternative_address.session)
2654 free_address (&n->alternative_address);
2655 if ( (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
2656 (S_CONNECTED_SWITCHING_CONNECT_SENT == n->state) )
2657 n->state = S_CONNECTED;
2661 return; /* doesn't affect us further */
2664 n->expect_latency_response = GNUNET_NO;
2668 case S_NOT_CONNECTED:
2670 free_neighbour (n, GNUNET_NO);
2674 free_neighbour (n, GNUNET_NO);
2676 case S_INIT_BLACKLIST:
2677 case S_CONNECT_SENT:
2678 free_address (&n->primary_address);
2679 n->state = S_INIT_ATS;
2680 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2681 // FIXME: need to ask ATS for suggestions again?
2682 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2684 case S_CONNECT_RECV_ATS:
2685 case S_CONNECT_RECV_BLACKLIST:
2686 case S_CONNECT_RECV_ACK:
2687 /* error on inbound session; free neighbour entirely */
2688 free_address (&n->primary_address);
2689 free_neighbour (n, GNUNET_NO);
2692 free_address (&n->primary_address);
2693 n->state = S_RECONNECT_ATS;
2694 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2695 /* FIXME: is this ATS call needed? */
2696 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2698 case S_RECONNECT_ATS:
2699 /* we don't have an address, how can it go down? */
2702 case S_RECONNECT_BLACKLIST:
2703 case S_RECONNECT_SENT:
2704 n->state = S_RECONNECT_ATS;
2705 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2706 // FIXME: need to ask ATS for suggestions again?
2707 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2709 case S_CONNECTED_SWITCHING_BLACKLIST:
2710 /* primary went down while we were checking secondary against
2711 blacklist, adopt secondary as primary */
2712 free_address (&n->primary_address);
2713 n->primary_address = n->alternative_address;
2714 memset (&n->alternative_address, 0, sizeof (struct NeighbourAddress));
2715 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
2716 n->state = S_RECONNECT_BLACKLIST;
2718 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2719 /* primary went down while we were waiting for CONNECT_ACK on secondary;
2720 secondary as primary */
2721 free_address (&n->primary_address);
2722 n->primary_address = n->alternative_address;
2723 memset (&n->alternative_address, 0, sizeof (struct NeighbourAddress));
2724 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
2725 n->state = S_RECONNECT_SENT;
2728 free_address (&n->primary_address);
2730 case S_DISCONNECT_FINISHED:
2731 /* neighbour was freed and plugins told to terminate session */
2734 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2738 if (GNUNET_SCHEDULER_NO_TASK != n->task)
2739 GNUNET_SCHEDULER_cancel (n->task);
2740 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
2745 * We received a 'SESSION_ACK' message from the other peer.
2746 * If we sent a 'CONNECT_ACK' last, this means we are now
2747 * connected. Otherwise, do nothing.
2749 * @param message possibly a 'struct SessionConnectMessage' (check format)
2750 * @param peer identity of the peer to switch the address for
2751 * @param address address of the other peer, NULL if other peer
2753 * @param session session to use (or NULL)
2754 * @param ats performance data
2755 * @param ats_count number of entries in ats
2758 GST_neighbours_handle_session_ack (const struct GNUNET_MessageHeader *message,
2759 const struct GNUNET_PeerIdentity *peer,
2760 const struct GNUNET_HELLO_Address *address,
2761 struct Session *session,
2762 const struct GNUNET_ATS_Information *ats,
2765 struct NeighbourMapEntry *n;
2767 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2768 "Received SESSION_ACK message from peer `%s'\n",
2770 if (ntohs (message->size) != sizeof (struct GNUNET_MessageHeader))
2772 GNUNET_break_op (0);
2775 if (NULL == (n = lookup_neighbour (peer)))
2777 /* check if we are in a plausible state for having sent
2778 a CONNECT_ACK. If not, return, otherwise break */
2779 if ( ( (S_CONNECT_RECV_ACK != n->state) &&
2780 (S_CONNECT_SENT != n->state) ) ||
2781 (2 != n->send_connect_ack) )
2783 GNUNET_STATISTICS_update (GST_stats,
2784 gettext_noop ("# unexpected SESSION ACK messages"), 1,
2788 n->state = S_CONNECTED;
2789 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2790 GNUNET_STATISTICS_set (GST_stats,
2791 gettext_noop ("# peers connected"),
2792 ++neighbours_connected,
2794 connect_notify_cb (callback_cls, &n->id, ats, ats_count);
2795 set_address (&n->primary_address,
2796 n->primary_address.address,
2797 n->primary_address.session,
2798 n->primary_address.bandwidth_in,
2799 n->primary_address.bandwidth_out,
2805 * Test if we're connected to the given peer.
2807 * @param target peer to test
2808 * @return GNUNET_YES if we are connected, GNUNET_NO if not
2811 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
2813 return test_connected (lookup_neighbour (target));
2818 * Change the incoming quota for the given peer.
2820 * @param neighbour identity of peer to change qutoa for
2821 * @param quota new quota
2824 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
2825 struct GNUNET_BANDWIDTH_Value32NBO quota)
2827 struct NeighbourMapEntry *n;
2829 if (NULL == (n = lookup_neighbour (neighbour)))
2831 GNUNET_STATISTICS_update (GST_stats,
2833 ("# SET QUOTA messages ignored (no such peer)"),
2837 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2838 "Setting inbound quota of %u Bps for peer `%s' to all clients\n",
2839 ntohl (quota.value__), GNUNET_i2s (&n->id));
2840 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
2841 if (0 != ntohl (quota.value__))
2843 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
2844 GNUNET_i2s (&n->id), "SET_QUOTA");
2845 if (GNUNET_YES == test_connected (n))
2846 GNUNET_STATISTICS_update (GST_stats,
2847 gettext_noop ("# disconnects due to quota of 0"),
2849 disconnect_neighbour (n);
2854 * We received a disconnect message from the given peer,
2855 * validate and process.
2857 * @param peer sender of the message
2858 * @param msg the disconnect message
2861 GST_neighbours_handle_disconnect_message (const struct GNUNET_PeerIdentity
2863 const struct GNUNET_MessageHeader
2866 struct NeighbourMapEntry *n;
2867 const struct SessionDisconnectMessage *sdm;
2870 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2871 "Received DISCONNECT message from peer `%s'\n",
2873 if (ntohs (msg->size) != sizeof (struct SessionDisconnectMessage))
2875 // GNUNET_break_op (0);
2876 GNUNET_STATISTICS_update (GST_stats,
2878 ("# disconnect messages ignored (old format)"), 1,
2882 sdm = (const struct SessionDisconnectMessage *) msg;
2883 if (NULL == (n = lookup_neighbour (peer)))
2884 return; /* gone already */
2885 if (GNUNET_TIME_absolute_ntoh (sdm->timestamp).abs_value <= n->connect_ack_timestamp.abs_value)
2887 GNUNET_STATISTICS_update (GST_stats,
2889 ("# disconnect messages ignored (timestamp)"), 1,
2893 GNUNET_CRYPTO_hash (&sdm->public_key,
2894 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2896 if (0 != memcmp (peer, &hc, sizeof (struct GNUNET_PeerIdentity)))
2898 GNUNET_break_op (0);
2901 if (ntohl (sdm->purpose.size) !=
2902 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2903 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
2904 sizeof (struct GNUNET_TIME_AbsoluteNBO))
2906 GNUNET_break_op (0);
2910 GNUNET_CRYPTO_rsa_verify
2911 (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT, &sdm->purpose,
2912 &sdm->signature, &sdm->public_key))
2914 GNUNET_break_op (0);
2917 if (GNUNET_YES == test_connected (n))
2918 GNUNET_STATISTICS_update (GST_stats,
2920 ("# other peer asked to disconnect from us"), 1,
2922 disconnect_neighbour (n);
2927 * Closure for the neighbours_iterate function.
2929 struct IteratorContext
2932 * Function to call on each connected neighbour.
2934 GST_NeighbourIterator cb;
2944 * Call the callback from the closure for each connected neighbour.
2946 * @param cls the 'struct IteratorContext'
2947 * @param key the hash of the public key of the neighbour
2948 * @param value the 'struct NeighbourMapEntry'
2949 * @return GNUNET_OK (continue to iterate)
2952 neighbours_iterate (void *cls, const GNUNET_HashCode * key, void *value)
2954 struct IteratorContext *ic = cls;
2955 struct NeighbourMapEntry *n = value;
2957 if (GNUNET_YES == test_connected (n))
2958 ic->cb (ic->cb_cls, &n->id, NULL, 0, n->primary_address.address);
2964 * Iterate over all connected neighbours.
2966 * @param cb function to call
2967 * @param cb_cls closure for cb
2970 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
2972 struct IteratorContext ic;
2974 if (NULL == neighbours)
2975 return; /* can happen during shutdown */
2978 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
2983 * If we have an active connection to the given target, it must be shutdown.
2985 * @param target peer to disconnect from
2988 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
2990 struct NeighbourMapEntry *n;
2992 if (NULL == (n = lookup_neighbour (target)))
2993 return; /* not active */
2994 if (GNUNET_YES == test_connected (n))
2995 GNUNET_STATISTICS_update (GST_stats,
2997 ("# disconnected from peer upon explicit request"), 1,
2999 disconnect_neighbour (n);
3004 * Obtain current latency information for the given neighbour.
3006 * @param peer to get the latency for
3007 * @return observed latency of the address, FOREVER if the
3008 * the connection is not up
3010 struct GNUNET_TIME_Relative
3011 GST_neighbour_get_latency (const struct GNUNET_PeerIdentity *peer)
3013 struct NeighbourMapEntry *n;
3015 n = lookup_neighbour (peer);
3017 return GNUNET_TIME_UNIT_FOREVER_REL;
3021 case S_RECONNECT_SENT:
3022 case S_RECONNECT_ATS:
3024 case S_NOT_CONNECTED:
3025 case S_INIT_BLACKLIST:
3027 case S_CONNECT_SENT:
3028 case S_CONNECT_RECV_BLACKLIST:
3030 case S_DISCONNECT_FINISHED:
3031 return GNUNET_TIME_UNIT_FOREVER_REL;
3033 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
3037 return GNUNET_TIME_UNIT_FOREVER_REL;
3042 * Obtain current address information for the given neighbour.
3045 * @return address currently used
3047 struct GNUNET_HELLO_Address *
3048 GST_neighbour_get_current_address (const struct GNUNET_PeerIdentity *peer)
3050 struct NeighbourMapEntry *n;
3052 n = lookup_neighbour (peer);
3055 return n->primary_address.address;
3060 * Initialize the neighbours subsystem.
3062 * @param cls closure for callbacks
3063 * @param connect_cb function to call if we connect to a peer
3064 * @param disconnect_cb function to call if we disconnect from a peer
3065 * @param peer_address_cb function to call if we change an active address
3069 GST_neighbours_start (void *cls,
3070 GNUNET_TRANSPORT_NotifyConnect connect_cb,
3071 GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb,
3072 GNUNET_TRANSPORT_PeerIterateCallback peer_address_cb)
3075 connect_notify_cb = connect_cb;
3076 disconnect_notify_cb = disconnect_cb;
3077 address_change_cb = peer_address_cb;
3078 neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE);
3083 * Disconnect from the given neighbour.
3086 * @param key hash of neighbour's public key (not used)
3087 * @param value the 'struct NeighbourMapEntry' of the neighbour
3088 * @return GNUNET_OK (continue to iterate)
3091 disconnect_all_neighbours (void *cls, const GNUNET_HashCode * key, void *value)
3093 struct NeighbourMapEntry *n = value;
3095 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3096 "Disconnecting peer `%4s', %s\n",
3097 GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
3098 n->state = S_DISCONNECT_FINISHED;
3099 free_neighbour (n, GNUNET_NO);
3105 * Cleanup the neighbours subsystem.
3108 GST_neighbours_stop ()
3110 if (NULL == neighbours)
3112 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
3113 &disconnect_all_neighbours,
3115 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
3117 callback_cls = NULL;
3118 connect_notify_cb = NULL;
3119 disconnect_notify_cb = NULL;
3120 address_change_cb = NULL;
3124 /* end of file gnunet-service-transport_neighbours.c */