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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 if (GNUNET_SCHEDULER_NO_TASK != n->task)
990 GNUNET_SCHEDULER_cancel (n->task);
991 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
996 * Transmit a DISCONNECT message to the other peer.
998 * @param n neighbour to send DISCONNECT message.
1001 send_disconnect (struct NeighbourMapEntry *n)
1003 struct SessionDisconnectMessage disconnect_msg;
1005 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1006 "Sending DISCONNECT message to peer `%4s'\n",
1007 GNUNET_i2s (&n->id));
1008 disconnect_msg.header.size = htons (sizeof (struct SessionDisconnectMessage));
1009 disconnect_msg.header.type =
1010 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1011 disconnect_msg.reserved = htonl (0);
1012 disconnect_msg.purpose.size =
1013 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
1014 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
1015 sizeof (struct GNUNET_TIME_AbsoluteNBO));
1016 disconnect_msg.purpose.purpose =
1017 htonl (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1018 disconnect_msg.timestamp =
1019 GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1020 disconnect_msg.public_key = GST_my_public_key;
1021 GNUNET_assert (GNUNET_OK ==
1022 GNUNET_CRYPTO_rsa_sign (GST_my_private_key,
1023 &disconnect_msg.purpose,
1024 &disconnect_msg.signature));
1026 send_with_session (n,
1027 (const char *) &disconnect_msg, sizeof (disconnect_msg),
1028 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
1029 &send_disconnect_cont, NULL);
1030 GNUNET_STATISTICS_update (GST_stats,
1032 ("# DISCONNECT messages sent"), 1,
1038 * Disconnect from the given neighbour, clean up the record.
1040 * @param n neighbour to disconnect from
1043 disconnect_neighbour (struct NeighbourMapEntry *n)
1045 /* depending on state, notify neighbour and/or upper layers of this peer
1049 case S_NOT_CONNECTED:
1051 case S_INIT_BLACKLIST:
1052 /* other peer is completely unaware of us, no need to send DISCONNECT */
1053 n->state = S_DISCONNECT_FINISHED;
1054 free_neighbour (n, GNUNET_NO);
1056 case S_CONNECT_SENT:
1057 send_disconnect (n);
1058 n->state = S_DISCONNECT;
1060 case S_CONNECT_RECV_ATS:
1061 case S_CONNECT_RECV_BLACKLIST:
1062 /* we never ACK'ed the other peer's request, no need to send DISCONNECT */
1063 n->state = S_DISCONNECT_FINISHED;
1064 free_neighbour (n, GNUNET_NO);
1066 case S_CONNECT_RECV_ACK:
1067 /* we DID ACK the other peer's request, must send DISCONNECT */
1068 send_disconnect (n);
1069 n->state = S_DISCONNECT;
1072 case S_RECONNECT_BLACKLIST:
1073 case S_RECONNECT_SENT:
1074 case S_CONNECTED_SWITCHING_BLACKLIST:
1075 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1076 /* we are currently connected, need to send disconnect and do
1077 internal notifications and update statistics */
1078 send_disconnect (n);
1079 GNUNET_STATISTICS_set (GST_stats,
1080 gettext_noop ("# peers connected"),
1081 --neighbours_connected,
1083 disconnect_notify_cb (callback_cls, &n->id);
1084 n->state = S_DISCONNECT;
1086 case S_RECONNECT_ATS:
1087 /* ATS address request timeout, disconnect without sending disconnect message */
1088 GNUNET_STATISTICS_set (GST_stats,
1089 gettext_noop ("# peers connected"),
1090 --neighbours_connected,
1092 disconnect_notify_cb (callback_cls, &n->id);
1093 n->state = S_DISCONNECT;
1096 /* already disconnected, ignore */
1098 case S_DISCONNECT_FINISHED:
1099 /* already cleaned up, how did we get here!? */
1103 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1107 /* schedule timeout to clean up */
1108 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1109 GNUNET_SCHEDULER_cancel (n->task);
1110 n->task = GNUNET_SCHEDULER_add_delayed (DISCONNECT_SENT_TIMEOUT,
1116 * We're done with our transmission attempt, continue processing.
1118 * @param cls the 'struct MessageQueue' of the message
1119 * @param receiver intended receiver
1120 * @param success whether it worked or not
1123 transmit_send_continuation (void *cls,
1124 const struct GNUNET_PeerIdentity *receiver,
1127 struct MessageQueue *mq = cls;
1128 struct NeighbourMapEntry *n;
1130 if (NULL == (n = lookup_neighbour (receiver)))
1131 return; /* disconnect or other error while transmitting, can happen */
1132 if (n->is_active == mq)
1134 /* this is still "our" neighbour, remove us from its queue
1135 and allow it to send the next message now */
1136 n->is_active = NULL;
1137 if (GNUNET_SCHEDULER_NO_TASK != n->task)
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 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1493 GNUNET_SCHEDULER_cancel (n->task);
1494 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1499 * Send a SESSION_CONNECT message via the given address.
1501 * @param na address to use
1504 send_session_connect (struct NeighbourAddress *na)
1506 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1507 struct SessionConnectMessage connect_msg;
1509 if (NULL == (papi = GST_plugins_find (na->address->transport_name)))
1514 if (NULL == na->session)
1515 na->session = papi->get_session (papi->cls, na->address);
1516 if (NULL == na->session)
1521 na->connect_timestamp = GNUNET_TIME_absolute_get ();
1522 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1523 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
1524 connect_msg.reserved = htonl (0);
1525 connect_msg.timestamp = GNUNET_TIME_absolute_hton (na->connect_timestamp);
1526 (void) papi->send (papi->cls,
1528 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1530 GNUNET_TIME_UNIT_FOREVER_REL,
1536 * Send a SESSION_CONNECT_ACK message via the given address.
1538 * @param address address to use
1539 * @param session session to use
1540 * @param timestamp timestamp to use for the ACK message
1543 send_session_connect_ack_message (const struct GNUNET_HELLO_Address *address,
1544 struct Session *session,
1545 struct GNUNET_TIME_Absolute timestamp)
1547 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1548 struct SessionConnectMessage connect_msg;
1550 if (NULL == (papi = GST_plugins_find (address->transport_name)))
1555 if (NULL == session)
1556 session = papi->get_session (papi->cls, address);
1557 if (NULL == session)
1562 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1563 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT_ACK);
1564 connect_msg.reserved = htonl (0);
1565 connect_msg.timestamp = GNUNET_TIME_absolute_hton (timestamp);
1566 (void) papi->send (papi->cls,
1568 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1570 GNUNET_TIME_UNIT_FOREVER_REL,
1576 * Create a fresh entry in the neighbour map for the given peer
1578 * @param peer peer to create an entry for
1579 * @return new neighbour map entry
1581 static struct NeighbourMapEntry *
1582 setup_neighbour (const struct GNUNET_PeerIdentity *peer)
1584 struct NeighbourMapEntry *n;
1586 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1587 "Creating new neighbour entry for `%s'\n",
1589 n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
1591 n->state = S_NOT_CONNECTED;
1592 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
1593 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
1594 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
1595 MAX_BANDWIDTH_CARRY_S);
1596 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1597 GNUNET_assert (GNUNET_OK ==
1598 GNUNET_CONTAINER_multihashmap_put (neighbours,
1599 &n->id.hashPubKey, n,
1600 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1606 * Check if the two given addresses are the same.
1607 * Actually only checks if the sessions are non-NULL
1608 * (which they should be) and then if they are identical;
1609 * the actual addresses don't matter if the session
1610 * pointers match anyway, and we must have session pointers
1613 * @param a1 first address to compare
1614 * @param a2 other address to compare
1615 * @return GNUNET_NO if the addresses do not match, GNUNET_YES if they do match
1618 address_matches (const struct NeighbourAddress *a1,
1619 const struct NeighbourAddress *a2)
1621 if ( (NULL == a1->session) ||
1622 (NULL == a2->session) )
1627 return (a1->session == a2->session) ? GNUNET_YES : GNUNET_NO;
1632 * Try to create a connection to the given target (eventually).
1634 * @param target peer to try to connect to
1637 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
1639 struct NeighbourMapEntry *n;
1641 if (NULL == neighbours)
1642 return; /* during shutdown, do nothing */
1643 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1644 "Asked to connect to peer `%s'\n",
1645 GNUNET_i2s (target));
1647 memcmp (target, &GST_my_identity, sizeof (struct GNUNET_PeerIdentity)))
1649 /* refuse to connect to myself */
1650 /* FIXME: can this happen? Is this not an API violation? */
1651 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1652 "Refusing to try to connect to myself.\n");
1655 n = lookup_neighbour (target);
1660 case S_NOT_CONNECTED:
1661 /* this should not be possible */
1663 free_neighbour (n, GNUNET_NO);
1666 case S_INIT_BLACKLIST:
1667 case S_CONNECT_SENT:
1668 case S_CONNECT_RECV_ATS:
1669 case S_CONNECT_RECV_BLACKLIST:
1670 case S_CONNECT_RECV_ACK:
1671 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1672 "Ignoring request to try to connect to `%s', already trying!\n",
1673 GNUNET_i2s (target));
1674 return; /* already trying */
1676 case S_RECONNECT_ATS:
1677 case S_RECONNECT_BLACKLIST:
1678 case S_RECONNECT_SENT:
1679 case S_CONNECTED_SWITCHING_BLACKLIST:
1680 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1681 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1682 "Ignoring request to try to connect, already connected to `%s'!\n",
1683 GNUNET_i2s (target));
1684 return; /* already connected */
1686 /* get rid of remains, ready to re-try immediately */
1687 free_neighbour (n, GNUNET_NO);
1689 case S_DISCONNECT_FINISHED:
1690 /* should not be possible */
1693 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1695 free_neighbour (n, GNUNET_NO);
1699 n = setup_neighbour (target);
1700 n->state = S_INIT_ATS;
1701 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1703 GNUNET_ATS_reset_backoff (GST_ats, target);
1704 GNUNET_ATS_suggest_address (GST_ats, target);
1709 * Function called with the result of a blacklist check.
1711 * @param cls closure with the 'struct BlackListCheckContext'
1712 * @param peer peer this check affects
1713 * @param result GNUNET_OK if the address is allowed
1716 handle_test_blacklist_cont (void *cls,
1717 const struct GNUNET_PeerIdentity *peer,
1720 struct BlackListCheckContext *bcc = cls;
1721 struct NeighbourMapEntry *n;
1724 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1725 "Connection to new address of peer `%s' based on blacklist is `%s'\n",
1727 (GNUNET_OK == result) ? "allowed" : "FORBIDDEN");
1728 if (GNUNET_OK == result)
1730 /* valid new address, let ATS know! */
1731 GNUNET_ATS_address_update (GST_ats,
1734 bcc->ats, bcc->ats_count);
1736 if (NULL == (n = lookup_neighbour (peer)))
1737 goto cleanup; /* nobody left to care about new address */
1740 case S_NOT_CONNECTED:
1741 /* this should not be possible */
1743 free_neighbour (n, GNUNET_NO);
1746 /* still waiting on ATS suggestion */
1748 case S_INIT_BLACKLIST:
1749 /* check if the address the blacklist was fine with matches
1750 ATS suggestion, if so, we can move on! */
1751 if ( (GNUNET_OK == result) &&
1752 (1 == n->send_connect_ack) )
1754 n->send_connect_ack = 2;
1755 send_session_connect_ack_message (bcc->na.address,
1757 n->connect_ack_timestamp);
1759 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1760 break; /* result for an address we currently don't care about */
1761 if (GNUNET_OK == result)
1763 n->timeout = GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT);
1764 n->state = S_CONNECT_SENT;
1765 send_session_connect (&n->primary_address);
1769 GNUNET_ATS_address_destroyed (GST_ats,
1772 n->state = S_INIT_ATS;
1773 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1774 // FIXME: do we need to ask ATS again for suggestions?
1775 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1778 case S_CONNECT_SENT:
1779 /* waiting on CONNECT_ACK, send ACK if one is pending */
1780 if ( (GNUNET_OK == result) &&
1781 (1 == n->send_connect_ack) )
1783 n->send_connect_ack = 2;
1784 send_session_connect_ack_message (n->primary_address.address,
1785 n->primary_address.session,
1786 n->connect_ack_timestamp);
1789 case S_CONNECT_RECV_ATS:
1790 /* still waiting on ATS suggestion, don't care about blacklist */
1792 case S_CONNECT_RECV_BLACKLIST:
1793 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1794 break; /* result for an address we currently don't care about */
1795 if (GNUNET_OK == result)
1797 n->timeout = GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT);
1798 n->state = S_CONNECT_RECV_ACK;
1799 send_session_connect_ack_message (bcc->na.address,
1801 n->connect_ack_timestamp);
1802 if (1 == n->send_connect_ack)
1803 n->send_connect_ack = 2;
1807 GNUNET_ATS_address_destroyed (GST_ats,
1810 n->state = S_INIT_ATS;
1811 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1812 // FIXME: do we need to ask ATS again for suggestions?
1813 GNUNET_ATS_reset_backoff (GST_ats, peer);
1814 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1817 case S_CONNECT_RECV_ACK:
1818 /* waiting on SESSION_ACK, send ACK if one is pending */
1819 if ( (GNUNET_OK == result) &&
1820 (1 == n->send_connect_ack) )
1822 n->send_connect_ack = 2;
1823 send_session_connect_ack_message (n->primary_address.address,
1824 n->primary_address.session,
1825 n->connect_ack_timestamp);
1829 /* already connected, don't care about blacklist */
1831 case S_RECONNECT_ATS:
1832 /* still waiting on ATS suggestion, don't care about blacklist */
1834 case S_RECONNECT_BLACKLIST:
1835 if ( (GNUNET_OK == result) &&
1836 (1 == n->send_connect_ack) )
1838 n->send_connect_ack = 2;
1839 send_session_connect_ack_message (bcc->na.address,
1841 n->connect_ack_timestamp);
1843 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1844 break; /* result for an address we currently don't care about */
1845 if (GNUNET_OK == result)
1847 send_session_connect (&n->primary_address);
1848 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
1849 n->state = S_RECONNECT_SENT;
1853 GNUNET_ATS_address_destroyed (GST_ats,
1856 n->state = S_RECONNECT_ATS;
1857 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1858 // FIXME: do we need to ask ATS again for suggestions?
1859 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1862 case S_RECONNECT_SENT:
1863 /* waiting on CONNECT_ACK, don't care about blacklist */
1864 if ( (GNUNET_OK == result) &&
1865 (1 == n->send_connect_ack) )
1867 n->send_connect_ack = 2;
1868 send_session_connect_ack_message (n->primary_address.address,
1869 n->primary_address.session,
1870 n->connect_ack_timestamp);
1873 case S_CONNECTED_SWITCHING_BLACKLIST:
1874 if (GNUNET_YES != address_matches (&bcc->na, &n->alternative_address))
1875 break; /* result for an address we currently don't care about */
1876 if (GNUNET_OK == result)
1878 send_session_connect (&n->alternative_address);
1879 n->state = S_CONNECTED_SWITCHING_CONNECT_SENT;
1883 GNUNET_ATS_address_destroyed (GST_ats,
1886 free_address (&n->alternative_address);
1887 n->state = S_CONNECTED;
1890 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1891 /* waiting on CONNECT_ACK, don't care about blacklist */
1892 if ( (GNUNET_OK == result) &&
1893 (1 == n->send_connect_ack) )
1895 n->send_connect_ack = 2;
1896 send_session_connect_ack_message (n->primary_address.address,
1897 n->primary_address.session,
1898 n->connect_ack_timestamp);
1902 /* Nothing to do here, ATS will already do what can be done */
1904 case S_DISCONNECT_FINISHED:
1905 /* should not be possible */
1909 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1911 free_neighbour (n, GNUNET_NO);
1915 GNUNET_HELLO_address_free (bcc->na.address);
1916 GNUNET_CONTAINER_DLL_remove (bc_head,
1924 * We want to know if connecting to a particular peer via
1925 * a particular address is allowed. Check it!
1927 * @param peer identity of the peer to switch the address for
1928 * @param ts time at which the check was initiated
1929 * @param address address of the other peer, NULL if other peer
1931 * @param session session to use (or NULL)
1932 * @param ats performance data
1933 * @param ats_count number of entries in ats (excluding 0-termination)
1936 check_blacklist (const struct GNUNET_PeerIdentity *peer,
1937 struct GNUNET_TIME_Absolute ts,
1938 const struct GNUNET_HELLO_Address *address,
1939 struct Session *session,
1940 const struct GNUNET_ATS_Information *ats,
1943 struct BlackListCheckContext *bcc;
1944 struct GST_BlacklistCheck *bc;
1947 GNUNET_malloc (sizeof (struct BlackListCheckContext) +
1948 sizeof (struct GNUNET_ATS_Information) * ats_count);
1949 bcc->ats_count = ats_count;
1950 bcc->na.address = GNUNET_HELLO_address_copy (address);
1951 bcc->na.session = session;
1952 bcc->na.connect_timestamp = ts;
1953 bcc->ats = (struct GNUNET_ATS_Information *) &bcc[1];
1954 memcpy (bcc->ats, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1955 GNUNET_CONTAINER_DLL_insert (bc_head,
1958 if (NULL != (bc = GST_blacklist_test_allowed (peer,
1959 address->transport_name,
1960 &handle_test_blacklist_cont, bcc)))
1962 /* if NULL == bc, 'cont' was already called and 'bcc' already free'd, so
1963 we must only store 'bc' if 'bc' is non-NULL... */
1968 * We received a 'SESSION_CONNECT' message from the other peer.
1969 * Consider switching to it.
1971 * @param message possibly a 'struct SessionConnectMessage' (check format)
1972 * @param peer identity of the peer to switch the address for
1973 * @param address address of the other peer, NULL if other peer
1975 * @param session session to use (or NULL)
1976 * @param ats performance data
1977 * @param ats_count number of entries in ats (excluding 0-termination)
1980 GST_neighbours_handle_connect (const struct GNUNET_MessageHeader *message,
1981 const struct GNUNET_PeerIdentity *peer,
1982 const struct GNUNET_HELLO_Address *address,
1983 struct Session *session,
1984 const struct GNUNET_ATS_Information *ats,
1987 const struct SessionConnectMessage *scm;
1988 struct NeighbourMapEntry *n;
1989 struct GNUNET_TIME_Absolute ts;
1991 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1992 "Received CONNECT message from peer `%s'\n",
1994 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
1996 GNUNET_break_op (0);
1999 if (NULL == neighbours)
2000 return; /* we're shutting down */
2001 scm = (const struct SessionConnectMessage *) message;
2002 GNUNET_break_op (0 == ntohl (scm->reserved));
2003 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2004 n = lookup_neighbour (peer);
2006 n = setup_neighbour (peer);
2007 n->send_connect_ack = 1;
2008 n->connect_ack_timestamp = ts;
2011 case S_NOT_CONNECTED:
2012 n->state = S_CONNECT_RECV_ATS;
2013 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2014 GNUNET_ATS_reset_backoff (GST_ats, peer);
2015 GNUNET_ATS_suggest_address (GST_ats, peer);
2016 check_blacklist (peer, ts, address, session, ats, ats_count);
2019 case S_INIT_BLACKLIST:
2020 case S_CONNECT_SENT:
2021 case S_CONNECT_RECV_ATS:
2022 case S_CONNECT_RECV_BLACKLIST:
2023 case S_CONNECT_RECV_ACK:
2024 /* It can never hurt to have an alternative address in the above cases,
2025 see if it is allowed */
2026 check_blacklist (peer, ts, address, session, ats, ats_count);
2029 /* we are already connected and can thus send the ACK immediately;
2030 still, it can never hurt to have an alternative address, so also
2031 tell ATS about it */
2032 GNUNET_assert (NULL != n->primary_address.address);
2033 GNUNET_assert (NULL != n->primary_address.session);
2034 n->send_connect_ack = 0;
2035 send_session_connect_ack_message (n->primary_address.address,
2036 n->primary_address.session, ts);
2037 check_blacklist (peer, ts, address, session, ats, ats_count);
2039 case S_RECONNECT_ATS:
2040 case S_RECONNECT_BLACKLIST:
2041 case S_RECONNECT_SENT:
2042 /* It can never hurt to have an alternative address in the above cases,
2043 see if it is allowed */
2044 check_blacklist (peer, ts, address, session, ats, ats_count);
2046 case S_CONNECTED_SWITCHING_BLACKLIST:
2047 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2048 /* we are already connected and can thus send the ACK immediately;
2049 still, it can never hurt to have an alternative address, so also
2050 tell ATS about it */
2051 GNUNET_assert (NULL != n->primary_address.address);
2052 GNUNET_assert (NULL != n->primary_address.session);
2053 n->send_connect_ack = 0;
2054 send_session_connect_ack_message (n->primary_address.address,
2055 n->primary_address.session, ts);
2056 check_blacklist (peer, ts, address, session, ats, ats_count);
2059 /* get rid of remains without terminating sessions, ready to re-try */
2060 free_neighbour (n, GNUNET_YES);
2061 n = setup_neighbour (peer);
2062 n->state = S_CONNECT_RECV_ATS;
2063 GNUNET_ATS_reset_backoff (GST_ats, peer);
2064 GNUNET_ATS_suggest_address (GST_ats, peer);
2066 case S_DISCONNECT_FINISHED:
2067 /* should not be possible */
2071 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2073 free_neighbour (n, GNUNET_NO);
2080 * For an existing neighbour record, set the active connection to
2081 * use the given address.
2083 * @param peer identity of the peer to switch the address for
2084 * @param address address of the other peer, NULL if other peer
2086 * @param session session to use (or NULL)
2087 * @param ats performance data
2088 * @param ats_count number of entries in ats
2089 * @param bandwidth_in inbound quota to be used when connection is up
2090 * @param bandwidth_out outbound quota to be used when connection is up
2093 GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
2094 const struct GNUNET_HELLO_Address *address,
2095 struct Session *session,
2096 const struct GNUNET_ATS_Information *ats,
2098 struct GNUNET_BANDWIDTH_Value32NBO
2100 struct GNUNET_BANDWIDTH_Value32NBO
2103 struct NeighbourMapEntry *n;
2104 struct GNUNET_TRANSPORT_PluginFunctions *papi;
2106 GNUNET_assert (address->transport_name != NULL);
2107 if (NULL == (n = lookup_neighbour (peer)))
2110 /* Obtain an session for this address from plugin */
2111 if (NULL == (papi = GST_plugins_find (address->transport_name)))
2113 /* we don't have the plugin for this address */
2114 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2117 if ((NULL == session) && (0 == address->address_length))
2120 if (strlen (address->transport_name) > 0)
2121 GNUNET_ATS_address_destroyed (GST_ats, address, session);
2124 if (NULL == session)
2125 session = papi->get_session (papi->cls, address);
2126 if (NULL == session)
2128 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2129 "Failed to obtain new session for peer `%s' and address '%s'\n",
2130 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
2131 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2134 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2135 "ATS tells us to switch to address '%s' for peer `%s'\n",
2136 (address->address_length != 0) ? GST_plugins_a2s (address): "<inbound>",
2140 case S_NOT_CONNECTED:
2142 free_neighbour (n, GNUNET_NO);
2145 set_address (&n->primary_address,
2146 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2147 n->state = S_INIT_BLACKLIST;
2148 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2149 check_blacklist (&n->id,
2150 n->connect_ack_timestamp,
2151 address, session, ats, ats_count);
2153 case S_INIT_BLACKLIST:
2154 /* ATS suggests a different address, switch again */
2155 set_address (&n->primary_address,
2156 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2157 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2158 check_blacklist (&n->id,
2159 n->connect_ack_timestamp,
2160 address, session, ats, ats_count);
2162 case S_CONNECT_SENT:
2163 /* ATS suggests a different address, switch again */
2164 set_address (&n->primary_address,
2165 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2166 n->state = S_INIT_BLACKLIST;
2167 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2168 check_blacklist (&n->id,
2169 n->connect_ack_timestamp,
2170 address, session, ats, ats_count);
2172 case S_CONNECT_RECV_ATS:
2173 set_address (&n->primary_address,
2174 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2175 n->state = S_CONNECT_RECV_BLACKLIST;
2176 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2177 check_blacklist (&n->id,
2178 n->connect_ack_timestamp,
2179 address, session, ats, ats_count);
2181 case S_CONNECT_RECV_BLACKLIST:
2182 case S_CONNECT_RECV_ACK:
2183 /* ATS asks us to switch while we were trying to connect; switch to new
2184 address and check blacklist again */
2185 set_address (&n->primary_address,
2186 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2187 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2188 check_blacklist (&n->id,
2189 n->connect_ack_timestamp,
2190 address, session, ats, ats_count);
2193 GNUNET_assert (NULL != n->primary_address.address);
2194 GNUNET_assert (NULL != n->primary_address.session);
2195 if (n->primary_address.session == session)
2197 /* not an address change, just a quota change */
2198 set_address (&n->primary_address,
2199 address, session, bandwidth_in, bandwidth_out, GNUNET_YES);
2202 /* ATS asks us to switch a life connection; see if we can get
2203 a CONNECT_ACK on it before we actually do this! */
2204 set_address (&n->alternative_address,
2205 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2206 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2207 check_blacklist (&n->id,
2208 GNUNET_TIME_absolute_get (),
2209 address, session, ats, ats_count);
2211 case S_RECONNECT_ATS:
2212 set_address (&n->primary_address,
2213 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2214 n->state = S_RECONNECT_BLACKLIST;
2215 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2216 check_blacklist (&n->id,
2217 n->connect_ack_timestamp,
2218 address, session, ats, ats_count);
2220 case S_RECONNECT_BLACKLIST:
2221 /* ATS asks us to switch while we were trying to reconnect; switch to new
2222 address and check blacklist again */
2223 set_address (&n->primary_address,
2224 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2225 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2226 check_blacklist (&n->id,
2227 n->connect_ack_timestamp,
2228 address, session, ats, ats_count);
2230 case S_RECONNECT_SENT:
2231 /* ATS asks us to switch while we were trying to reconnect; switch to new
2232 address and check blacklist again */
2233 set_address (&n->primary_address,
2234 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2235 n->state = S_RECONNECT_BLACKLIST;
2236 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2237 check_blacklist (&n->id,
2238 n->connect_ack_timestamp,
2239 address, session, ats, ats_count);
2241 case S_CONNECTED_SWITCHING_BLACKLIST:
2242 if (n->primary_address.session == session)
2244 /* ATS switches back to still-active session */
2245 free_address (&n->alternative_address);
2246 n->state = S_CONNECTED;
2249 /* ATS asks us to switch a life connection, update blacklist check */
2250 set_address (&n->alternative_address,
2251 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2252 check_blacklist (&n->id,
2253 GNUNET_TIME_absolute_get (),
2254 address, session, ats, ats_count);
2256 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2257 if (n->primary_address.session == session)
2259 /* ATS switches back to still-active session */
2260 free_address (&n->alternative_address);
2261 n->state = S_CONNECTED;
2264 /* ATS asks us to switch a life connection, update blacklist check */
2265 set_address (&n->alternative_address,
2266 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2267 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2268 check_blacklist (&n->id,
2269 GNUNET_TIME_absolute_get (),
2270 address, session, ats, ats_count);
2273 /* not going to switch addresses while disconnecting */
2275 case S_DISCONNECT_FINISHED:
2279 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2287 * Master task run for every neighbour. Performs all of the time-related
2288 * activities (keep alive, send next message, disconnect if idle, finish
2289 * clean up after disconnect).
2291 * @param cls the 'struct NeighbourMapEntry' for which we are running
2292 * @param tc scheduler context (unused)
2295 master_task (void *cls,
2296 const struct GNUNET_SCHEDULER_TaskContext *tc)
2298 struct NeighbourMapEntry *n = cls;
2299 struct GNUNET_TIME_Relative delay;
2301 n->task = GNUNET_SCHEDULER_NO_TASK;
2302 delay = GNUNET_TIME_absolute_get_remaining (n->timeout);
2305 case S_NOT_CONNECTED:
2306 /* invalid state for master task, clean up */
2308 n->state = S_DISCONNECT_FINISHED;
2309 free_neighbour (n, GNUNET_NO);
2312 if (0 == delay.rel_value)
2314 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2315 "Connection to `%s' timed out waiting for ATS to provide address\n",
2316 GNUNET_i2s (&n->id));
2317 n->state = S_DISCONNECT_FINISHED;
2318 free_neighbour (n, GNUNET_NO);
2322 case S_INIT_BLACKLIST:
2323 if (0 == delay.rel_value)
2325 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2326 "Connection to `%s' timed out waiting for BLACKLIST to approve address\n",
2327 GNUNET_i2s (&n->id));
2328 n->state = S_DISCONNECT_FINISHED;
2329 free_neighbour (n, GNUNET_NO);
2333 case S_CONNECT_SENT:
2334 if (0 == delay.rel_value)
2336 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2337 "Connection to `%s' timed out waiting for other peer to send CONNECT_ACK\n",
2338 GNUNET_i2s (&n->id));
2339 disconnect_neighbour (n);
2343 case S_CONNECT_RECV_ATS:
2344 if (0 == delay.rel_value)
2346 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2347 "Connection to `%s' timed out waiting ATS to provide address to use for CONNECT_ACK\n",
2348 GNUNET_i2s (&n->id));
2349 n->state = S_DISCONNECT_FINISHED;
2350 free_neighbour (n, GNUNET_NO);
2354 case S_CONNECT_RECV_BLACKLIST:
2355 if (0 == delay.rel_value)
2357 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2358 "Connection to `%s' timed out waiting BLACKLIST to approve address to use for CONNECT_ACK\n",
2359 GNUNET_i2s (&n->id));
2360 n->state = S_DISCONNECT_FINISHED;
2361 free_neighbour (n, GNUNET_NO);
2365 case S_CONNECT_RECV_ACK:
2366 if (0 == delay.rel_value)
2368 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2369 "Connection to `%s' timed out waiting for other peer to send SESSION_ACK\n",
2370 GNUNET_i2s (&n->id));
2371 disconnect_neighbour (n);
2376 if (0 == delay.rel_value)
2378 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2379 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2380 GNUNET_i2s (&n->id));
2381 disconnect_neighbour (n);
2384 try_transmission_to_peer (n);
2387 case S_RECONNECT_ATS:
2388 if (0 == delay.rel_value)
2390 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2391 "Connection to `%s' timed out, waiting for ATS replacement address\n",
2392 GNUNET_i2s (&n->id));
2393 disconnect_neighbour (n);
2397 case S_RECONNECT_BLACKLIST:
2398 if (0 == delay.rel_value)
2400 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2401 "Connection to `%s' timed out, waiting for BLACKLIST to approve replacement address\n",
2402 GNUNET_i2s (&n->id));
2403 disconnect_neighbour (n);
2407 case S_RECONNECT_SENT:
2408 if (0 == delay.rel_value)
2410 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2411 "Connection to `%s' timed out, waiting for other peer to CONNECT_ACK replacement address\n",
2412 GNUNET_i2s (&n->id));
2413 disconnect_neighbour (n);
2417 case S_CONNECTED_SWITCHING_BLACKLIST:
2418 if (0 == delay.rel_value)
2420 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2421 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2422 GNUNET_i2s (&n->id));
2423 disconnect_neighbour (n);
2426 try_transmission_to_peer (n);
2429 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2430 if (0 == delay.rel_value)
2432 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2433 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs (after trying to CONNECT on alternative address)\n",
2434 GNUNET_i2s (&n->id));
2435 disconnect_neighbour (n);
2438 try_transmission_to_peer (n);
2442 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2443 "Cleaning up connection to `%s' after sending DISCONNECT\n",
2444 GNUNET_i2s (&n->id));
2445 n->state = S_DISCONNECT_FINISHED;
2446 free_neighbour (n, GNUNET_NO);
2448 case S_DISCONNECT_FINISHED:
2449 /* how did we get here!? */
2453 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2457 delay = GNUNET_TIME_relative_min (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time),
2459 if (GNUNET_SCHEDULER_NO_TASK == n->task)
2460 n->task = GNUNET_SCHEDULER_add_delayed (delay,
2467 * Send a SESSION_ACK message to the neighbour to confirm that we
2468 * got his CONNECT_ACK.
2470 * @param n neighbour to send the SESSION_ACK to
2473 send_session_ack_message (struct NeighbourMapEntry *n)
2475 struct GNUNET_MessageHeader msg;
2477 msg.size = htons (sizeof (struct GNUNET_MessageHeader));
2478 msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK);
2479 (void) send_with_session(n,
2480 (const char *) &msg, sizeof (struct GNUNET_MessageHeader),
2481 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
2487 * We received a 'SESSION_CONNECT_ACK' message from the other peer.
2488 * Consider switching to it.
2490 * @param message possibly a 'struct SessionConnectMessage' (check format)
2491 * @param peer identity of the peer to switch the address for
2492 * @param address address of the other peer, NULL if other peer
2494 * @param session session to use (or NULL)
2495 * @param ats performance data
2496 * @param ats_count number of entries in ats
2499 GST_neighbours_handle_connect_ack (const struct GNUNET_MessageHeader *message,
2500 const struct GNUNET_PeerIdentity *peer,
2501 const struct GNUNET_HELLO_Address *address,
2502 struct Session *session,
2503 const struct GNUNET_ATS_Information *ats,
2506 const struct SessionConnectMessage *scm;
2507 struct GNUNET_TIME_Absolute ts;
2508 struct NeighbourMapEntry *n;
2510 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2511 "Received CONNECT_ACK message from peer `%s'\n",
2513 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2515 GNUNET_break_op (0);
2518 scm = (const struct SessionConnectMessage *) message;
2519 GNUNET_break_op (ntohl (scm->reserved) == 0);
2520 if (NULL == (n = lookup_neighbour (peer)))
2522 GNUNET_STATISTICS_update (GST_stats,
2524 ("# unexpected CONNECT_ACK messages (no peer)"),
2528 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2531 case S_NOT_CONNECTED:
2533 free_neighbour (n, GNUNET_NO);
2536 case S_INIT_BLACKLIST:
2537 GNUNET_STATISTICS_update (GST_stats,
2539 ("# unexpected CONNECT_ACK messages (not ready)"),
2542 case S_CONNECT_SENT:
2543 if (ts.abs_value != n->primary_address.connect_timestamp.abs_value)
2544 break; /* ACK does not match our original CONNECT message */
2545 n->state = S_CONNECTED;
2546 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2547 GNUNET_STATISTICS_set (GST_stats,
2548 gettext_noop ("# peers connected"),
2549 ++neighbours_connected,
2551 connect_notify_cb (callback_cls, &n->id, ats, ats_count);
2552 set_address (&n->primary_address,
2553 n->primary_address.address,
2554 n->primary_address.session,
2555 n->primary_address.bandwidth_in,
2556 n->primary_address.bandwidth_out,
2558 send_session_ack_message (n);
2560 case S_CONNECT_RECV_ATS:
2561 case S_CONNECT_RECV_BLACKLIST:
2562 case S_CONNECT_RECV_ACK:
2563 GNUNET_STATISTICS_update (GST_stats,
2565 ("# unexpected CONNECT_ACK messages (not ready)"),
2569 /* duplicate CONNECT_ACK, let's answer by duplciate SESSION_ACK just in case */
2570 send_session_ack_message (n);
2572 case S_RECONNECT_ATS:
2573 case S_RECONNECT_BLACKLIST:
2574 /* we didn't expect any CONNECT_ACK, as we are waiting for ATS
2575 to give us a new address... */
2576 GNUNET_STATISTICS_update (GST_stats,
2578 ("# unexpected CONNECT_ACK messages (waiting on ATS)"),
2581 case S_RECONNECT_SENT:
2582 /* new address worked; go back to connected! */
2583 n->state = S_CONNECTED;
2584 send_session_ack_message (n);
2586 case S_CONNECTED_SWITCHING_BLACKLIST:
2587 /* duplicate CONNECT_ACK, let's answer by duplciate SESSION_ACK just in case */
2588 send_session_ack_message (n);
2590 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2591 /* new address worked; adopt it and go back to connected! */
2592 n->state = S_CONNECTED;
2593 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2594 GNUNET_break (GNUNET_NO == n->alternative_address.ats_active);
2595 set_address (&n->primary_address,
2596 n->alternative_address.address,
2597 n->alternative_address.session,
2598 n->alternative_address.bandwidth_in,
2599 n->alternative_address.bandwidth_out,
2601 free_address (&n->alternative_address);
2602 send_session_ack_message (n);
2605 GNUNET_STATISTICS_update (GST_stats,
2607 ("# unexpected CONNECT_ACK messages (disconnecting)"),
2610 case S_DISCONNECT_FINISHED:
2614 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2622 * A session was terminated. Take note; if needed, try to get
2623 * an alternative address from ATS.
2625 * @param peer identity of the peer where the session died
2626 * @param session session that is gone
2629 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
2630 struct Session *session)
2632 struct NeighbourMapEntry *n;
2633 struct BlackListCheckContext *bcc;
2634 struct BlackListCheckContext *bcc_next;
2636 /* make sure to cancel all ongoing blacklist checks involving 'session' */
2638 while (NULL != (bcc = bcc_next))
2640 bcc_next = bcc->next;
2641 if (bcc->na.session == session)
2643 GST_blacklist_test_cancel (bcc->bc);
2644 GNUNET_HELLO_address_free (bcc->na.address);
2645 GNUNET_CONTAINER_DLL_remove (bc_head,
2651 if (NULL == (n = lookup_neighbour (peer)))
2652 return; /* can't affect us */
2653 if (session != n->primary_address.session)
2655 if (session == n->alternative_address.session)
2657 free_address (&n->alternative_address);
2658 if ( (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
2659 (S_CONNECTED_SWITCHING_CONNECT_SENT == n->state) )
2660 n->state = S_CONNECTED;
2664 return; /* doesn't affect us further */
2667 n->expect_latency_response = GNUNET_NO;
2671 case S_NOT_CONNECTED:
2673 free_neighbour (n, GNUNET_NO);
2677 free_neighbour (n, GNUNET_NO);
2679 case S_INIT_BLACKLIST:
2680 case S_CONNECT_SENT:
2681 free_address (&n->primary_address);
2682 n->state = S_INIT_ATS;
2683 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2684 // FIXME: need to ask ATS for suggestions again?
2685 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2687 case S_CONNECT_RECV_ATS:
2688 case S_CONNECT_RECV_BLACKLIST:
2689 case S_CONNECT_RECV_ACK:
2690 /* error on inbound session; free neighbour entirely */
2691 free_address (&n->primary_address);
2692 free_neighbour (n, GNUNET_NO);
2695 free_address (&n->primary_address);
2696 n->state = S_RECONNECT_ATS;
2697 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2698 /* FIXME: is this ATS call needed? */
2699 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2701 case S_RECONNECT_ATS:
2702 /* we don't have an address, how can it go down? */
2705 case S_RECONNECT_BLACKLIST:
2706 case S_RECONNECT_SENT:
2707 n->state = S_RECONNECT_ATS;
2708 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2709 // FIXME: need to ask ATS for suggestions again?
2710 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2712 case S_CONNECTED_SWITCHING_BLACKLIST:
2713 /* primary went down while we were checking secondary against
2714 blacklist, adopt secondary as primary */
2715 free_address (&n->primary_address);
2716 n->primary_address = n->alternative_address;
2717 memset (&n->alternative_address, 0, sizeof (struct NeighbourAddress));
2718 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
2719 n->state = S_RECONNECT_BLACKLIST;
2721 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2722 /* primary went down while we were waiting for CONNECT_ACK on secondary;
2723 secondary as primary */
2724 free_address (&n->primary_address);
2725 n->primary_address = n->alternative_address;
2726 memset (&n->alternative_address, 0, sizeof (struct NeighbourAddress));
2727 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
2728 n->state = S_RECONNECT_SENT;
2731 free_address (&n->primary_address);
2733 case S_DISCONNECT_FINISHED:
2734 /* neighbour was freed and plugins told to terminate session */
2737 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2741 if (GNUNET_SCHEDULER_NO_TASK != n->task)
2742 GNUNET_SCHEDULER_cancel (n->task);
2743 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
2748 * We received a 'SESSION_ACK' message from the other peer.
2749 * If we sent a 'CONNECT_ACK' last, this means we are now
2750 * connected. Otherwise, do nothing.
2752 * @param message possibly a 'struct SessionConnectMessage' (check format)
2753 * @param peer identity of the peer to switch the address for
2754 * @param address address of the other peer, NULL if other peer
2756 * @param session session to use (or NULL)
2757 * @param ats performance data
2758 * @param ats_count number of entries in ats
2761 GST_neighbours_handle_session_ack (const struct GNUNET_MessageHeader *message,
2762 const struct GNUNET_PeerIdentity *peer,
2763 const struct GNUNET_HELLO_Address *address,
2764 struct Session *session,
2765 const struct GNUNET_ATS_Information *ats,
2768 struct NeighbourMapEntry *n;
2770 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2771 "Received SESSION_ACK message from peer `%s'\n",
2773 if (ntohs (message->size) != sizeof (struct GNUNET_MessageHeader))
2775 GNUNET_break_op (0);
2778 if (NULL == (n = lookup_neighbour (peer)))
2780 /* check if we are in a plausible state for having sent
2781 a CONNECT_ACK. If not, return, otherwise break */
2782 if ( ( (S_CONNECT_RECV_ACK != n->state) &&
2783 (S_CONNECT_SENT != n->state) ) ||
2784 (2 != n->send_connect_ack) )
2786 GNUNET_STATISTICS_update (GST_stats,
2787 gettext_noop ("# unexpected SESSION ACK messages"), 1,
2791 n->state = S_CONNECTED;
2792 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2793 GNUNET_STATISTICS_set (GST_stats,
2794 gettext_noop ("# peers connected"),
2795 ++neighbours_connected,
2797 connect_notify_cb (callback_cls, &n->id, ats, ats_count);
2798 set_address (&n->primary_address,
2799 n->primary_address.address,
2800 n->primary_address.session,
2801 n->primary_address.bandwidth_in,
2802 n->primary_address.bandwidth_out,
2808 * Test if we're connected to the given peer.
2810 * @param target peer to test
2811 * @return GNUNET_YES if we are connected, GNUNET_NO if not
2814 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
2816 return test_connected (lookup_neighbour (target));
2821 * Change the incoming quota for the given peer.
2823 * @param neighbour identity of peer to change qutoa for
2824 * @param quota new quota
2827 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
2828 struct GNUNET_BANDWIDTH_Value32NBO quota)
2830 struct NeighbourMapEntry *n;
2832 if (NULL == (n = lookup_neighbour (neighbour)))
2834 GNUNET_STATISTICS_update (GST_stats,
2836 ("# SET QUOTA messages ignored (no such peer)"),
2840 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2841 "Setting inbound quota of %u Bps for peer `%s' to all clients\n",
2842 ntohl (quota.value__), GNUNET_i2s (&n->id));
2843 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
2844 if (0 != ntohl (quota.value__))
2846 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
2847 GNUNET_i2s (&n->id), "SET_QUOTA");
2848 if (GNUNET_YES == test_connected (n))
2849 GNUNET_STATISTICS_update (GST_stats,
2850 gettext_noop ("# disconnects due to quota of 0"),
2852 disconnect_neighbour (n);
2857 * We received a disconnect message from the given peer,
2858 * validate and process.
2860 * @param peer sender of the message
2861 * @param msg the disconnect message
2864 GST_neighbours_handle_disconnect_message (const struct GNUNET_PeerIdentity
2866 const struct GNUNET_MessageHeader
2869 struct NeighbourMapEntry *n;
2870 const struct SessionDisconnectMessage *sdm;
2873 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2874 "Received DISCONNECT message from peer `%s'\n",
2876 if (ntohs (msg->size) != sizeof (struct SessionDisconnectMessage))
2878 // GNUNET_break_op (0);
2879 GNUNET_STATISTICS_update (GST_stats,
2881 ("# disconnect messages ignored (old format)"), 1,
2885 sdm = (const struct SessionDisconnectMessage *) msg;
2886 if (NULL == (n = lookup_neighbour (peer)))
2887 return; /* gone already */
2888 if (GNUNET_TIME_absolute_ntoh (sdm->timestamp).abs_value <= n->connect_ack_timestamp.abs_value)
2890 GNUNET_STATISTICS_update (GST_stats,
2892 ("# disconnect messages ignored (timestamp)"), 1,
2896 GNUNET_CRYPTO_hash (&sdm->public_key,
2897 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2899 if (0 != memcmp (peer, &hc, sizeof (struct GNUNET_PeerIdentity)))
2901 GNUNET_break_op (0);
2904 if (ntohl (sdm->purpose.size) !=
2905 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2906 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
2907 sizeof (struct GNUNET_TIME_AbsoluteNBO))
2909 GNUNET_break_op (0);
2913 GNUNET_CRYPTO_rsa_verify
2914 (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT, &sdm->purpose,
2915 &sdm->signature, &sdm->public_key))
2917 GNUNET_break_op (0);
2920 if (GNUNET_YES == test_connected (n))
2921 GNUNET_STATISTICS_update (GST_stats,
2923 ("# other peer asked to disconnect from us"), 1,
2925 disconnect_neighbour (n);
2930 * Closure for the neighbours_iterate function.
2932 struct IteratorContext
2935 * Function to call on each connected neighbour.
2937 GST_NeighbourIterator cb;
2947 * Call the callback from the closure for each connected neighbour.
2949 * @param cls the 'struct IteratorContext'
2950 * @param key the hash of the public key of the neighbour
2951 * @param value the 'struct NeighbourMapEntry'
2952 * @return GNUNET_OK (continue to iterate)
2955 neighbours_iterate (void *cls, const GNUNET_HashCode * key, void *value)
2957 struct IteratorContext *ic = cls;
2958 struct NeighbourMapEntry *n = value;
2960 if (GNUNET_YES == test_connected (n))
2961 ic->cb (ic->cb_cls, &n->id, NULL, 0, n->primary_address.address);
2967 * Iterate over all connected neighbours.
2969 * @param cb function to call
2970 * @param cb_cls closure for cb
2973 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
2975 struct IteratorContext ic;
2977 if (NULL == neighbours)
2978 return; /* can happen during shutdown */
2981 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
2986 * If we have an active connection to the given target, it must be shutdown.
2988 * @param target peer to disconnect from
2991 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
2993 struct NeighbourMapEntry *n;
2995 if (NULL == (n = lookup_neighbour (target)))
2996 return; /* not active */
2997 if (GNUNET_YES == test_connected (n))
2998 GNUNET_STATISTICS_update (GST_stats,
3000 ("# disconnected from peer upon explicit request"), 1,
3002 disconnect_neighbour (n);
3007 * Obtain current latency information for the given neighbour.
3009 * @param peer to get the latency for
3010 * @return observed latency of the address, FOREVER if the
3011 * the connection is not up
3013 struct GNUNET_TIME_Relative
3014 GST_neighbour_get_latency (const struct GNUNET_PeerIdentity *peer)
3016 struct NeighbourMapEntry *n;
3018 n = lookup_neighbour (peer);
3020 return GNUNET_TIME_UNIT_FOREVER_REL;
3024 case S_RECONNECT_SENT:
3025 case S_RECONNECT_ATS:
3027 case S_NOT_CONNECTED:
3028 case S_INIT_BLACKLIST:
3030 case S_CONNECT_SENT:
3031 case S_CONNECT_RECV_BLACKLIST:
3033 case S_DISCONNECT_FINISHED:
3034 return GNUNET_TIME_UNIT_FOREVER_REL;
3036 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
3040 return GNUNET_TIME_UNIT_FOREVER_REL;
3045 * Obtain current address information for the given neighbour.
3048 * @return address currently used
3050 struct GNUNET_HELLO_Address *
3051 GST_neighbour_get_current_address (const struct GNUNET_PeerIdentity *peer)
3053 struct NeighbourMapEntry *n;
3055 n = lookup_neighbour (peer);
3058 return n->primary_address.address;
3063 * Initialize the neighbours subsystem.
3065 * @param cls closure for callbacks
3066 * @param connect_cb function to call if we connect to a peer
3067 * @param disconnect_cb function to call if we disconnect from a peer
3068 * @param peer_address_cb function to call if we change an active address
3072 GST_neighbours_start (void *cls,
3073 GNUNET_TRANSPORT_NotifyConnect connect_cb,
3074 GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb,
3075 GNUNET_TRANSPORT_PeerIterateCallback peer_address_cb)
3078 connect_notify_cb = connect_cb;
3079 disconnect_notify_cb = disconnect_cb;
3080 address_change_cb = peer_address_cb;
3081 neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE);
3086 * Disconnect from the given neighbour.
3089 * @param key hash of neighbour's public key (not used)
3090 * @param value the 'struct NeighbourMapEntry' of the neighbour
3091 * @return GNUNET_OK (continue to iterate)
3094 disconnect_all_neighbours (void *cls, const GNUNET_HashCode * key, void *value)
3096 struct NeighbourMapEntry *n = value;
3098 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3099 "Disconnecting peer `%4s', %s\n",
3100 GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
3101 n->state = S_DISCONNECT_FINISHED;
3102 free_neighbour (n, GNUNET_NO);
3108 * Cleanup the neighbours subsystem.
3111 GST_neighbours_stop ()
3113 if (NULL == neighbours)
3115 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
3116 &disconnect_all_neighbours,
3118 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
3120 callback_cls = NULL;
3121 connect_notify_cb = NULL;
3122 disconnect_notify_cb = NULL;
3123 address_change_cb = NULL;
3127 /* end of file gnunet-service-transport_neighbours.c */