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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 (S_CONNECT_RECV_BLACKLIST_INBOUND).
225 * If this check is successful, we give the inbound address to ATS.
226 * After the check we ask ATS for a suggestion (S_CONNECT_RECV_ATS).
227 * If ATS makes a suggestion, 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, do a blacklist check for inbound address
307 S_CONNECT_RECV_BLACKLIST_INBOUND,
310 * Received a CONNECT, asking ATS about address suggestions.
315 * Received CONNECT from other peer, got an address, checking with blacklist.
317 S_CONNECT_RECV_BLACKLIST,
320 * CONNECT request from other peer was SESSION_ACK'ed, waiting for
326 * Got our CONNECT_ACK/SESSION_ACK, connection is up.
331 * Connection got into trouble, rest of the system still believes
332 * it to be up, but we're getting a new address from ATS.
337 * Connection got into trouble, rest of the system still believes
338 * it to be up; we are checking the new address against the blacklist.
340 S_RECONNECT_BLACKLIST,
343 * Sent CONNECT over new address (either by ATS telling us to switch
344 * addresses or from RECONNECT_ATS); if this fails, we need to tell
345 * the rest of the system about a disconnect.
350 * We have some primary connection, but ATS suggested we switch
351 * to some alternative; we're now checking the alternative against
354 S_CONNECTED_SWITCHING_BLACKLIST,
357 * We have some primary connection, but ATS suggested we switch
358 * to some alternative; we now sent a CONNECT message for the
359 * alternative session to the other peer and waiting for a
360 * CONNECT_ACK to make this our primary connection.
362 S_CONNECTED_SWITCHING_CONNECT_SENT,
365 * Disconnect in progress (we're sending the DISCONNECT message to the
366 * other peer; after that is finished, the state will be cleaned up).
371 * We're finished with the disconnect; and are cleaning up the state
372 * now! We put the struct into this state when we are really in the
373 * task that calls 'free' on it and are about to remove the record
374 * from the map. We should never find a 'struct NeighbourMapEntry'
375 * in this state in the map. Accessing a 'struct NeighbourMapEntry'
376 * in this state virtually always means using memory that has been
377 * freed (the exception being the cleanup code in 'free_neighbour').
379 S_DISCONNECT_FINISHED
384 * A possible address we could use to communicate with a neighbour.
386 struct NeighbourAddress
390 * Active session for this address.
392 struct Session *session;
395 * Network-level address information.
397 struct GNUNET_HELLO_Address *address;
400 * Timestamp of the 'SESSION_CONNECT' message we sent to the other
401 * peer for this address. Use to check that the ACK is in response
402 * to our most recent 'CONNECT'.
404 struct GNUNET_TIME_Absolute connect_timestamp;
407 * Inbound bandwidth from ATS for this address.
409 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in;
412 * Outbound bandwidth from ATS for this address.
414 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out;
417 * Did we tell ATS that this is our 'active' address?
425 * Entry in neighbours.
427 struct NeighbourMapEntry
431 * Head of list of messages we would like to send to this peer;
432 * must contain at most one message per client.
434 struct MessageQueue *messages_head;
437 * Tail of list of messages we would like to send to this peer; must
438 * contain at most one message per client.
440 struct MessageQueue *messages_tail;
443 * Are we currently trying to send a message? If so, which one?
445 struct MessageQueue *is_active;
448 * Primary address we currently use to communicate with the neighbour.
450 struct NeighbourAddress primary_address;
453 * Alternative address currently under consideration for communicating
454 * with the neighbour.
456 struct NeighbourAddress alternative_address;
459 * Identity of this neighbour.
461 struct GNUNET_PeerIdentity id;
464 * Main task that drives this peer (timeouts, keepalives, etc.).
465 * Always runs the 'master_task'.
467 GNUNET_SCHEDULER_TaskIdentifier task;
470 * At what time should we sent the next keep-alive message?
472 struct GNUNET_TIME_Absolute keep_alive_time;
475 * At what time did we sent the last keep-alive message? Used
476 * to calculate round-trip time ("latency").
478 struct GNUNET_TIME_Absolute last_keep_alive_time;
481 * Timestamp we should include in our next CONNECT_ACK message.
482 * (only valid if 'send_connect_ack' is GNUNET_YES). Used to build
483 * our CONNECT_ACK message.
485 struct GNUNET_TIME_Absolute connect_ack_timestamp;
488 * Time where we should cut the connection (timeout) if we don't
489 * make progress in the state machine (or get a KEEPALIVE_RESPONSE
490 * if we are in S_CONNECTED).
492 struct GNUNET_TIME_Absolute timeout;
495 * Latest calculated latency value
497 struct GNUNET_TIME_Relative latency;
500 * Tracker for inbound bandwidth.
502 struct GNUNET_BANDWIDTH_Tracker in_tracker;
505 * How often has the other peer (recently) violated the inbound
506 * traffic limit? Incremented by 10 per violation, decremented by 1
507 * per non-violation (for each time interval).
509 unsigned int quota_violation_count;
512 * The current state of the peer.
517 * Did we sent an KEEP_ALIVE message and are we expecting a response?
519 int expect_latency_response;
522 * Flag to set if we still need to send a CONNECT_ACK message to the other peer
523 * (once we have an address to use and the peer has been allowed by our
524 * blacklist). Set to 1 if we need to send a CONNECT_ACK. Set to 2 if we
525 * did send a CONNECT_ACK and should go to 'S_CONNECTED' upon receiving
526 * a 'SESSION_ACK' (regardless of what our own state machine might say).
528 int send_connect_ack;
534 * Context for blacklist checks and the 'handle_test_blacklist_cont'
535 * function. Stores information about ongoing blacklist checks.
537 struct BlackListCheckContext
541 * We keep blacklist checks in a DLL.
543 struct BlackListCheckContext *next;
546 * We keep blacklist checks in a DLL.
548 struct BlackListCheckContext *prev;
551 * Address that is being checked.
553 struct NeighbourAddress na;
556 * ATS information about the address.
558 struct GNUNET_ATS_Information *ats;
561 * Handle to the ongoing blacklist check.
563 struct GST_BlacklistCheck *bc;
566 * Size of the 'ats' array.
574 * Hash map from peer identities to the respective 'struct NeighbourMapEntry'.
576 static struct GNUNET_CONTAINER_MultiHashMap *neighbours;
579 * We keep blacklist checks in a DLL so that we can find
580 * the 'sessions' in their 'struct NeighbourAddress' if
581 * a session goes down.
583 static struct BlackListCheckContext *bc_head;
586 * We keep blacklist checks in a DLL.
588 static struct BlackListCheckContext *bc_tail;
591 * Closure for connect_notify_cb, disconnect_notify_cb and address_change_cb
593 static void *callback_cls;
596 * Function to call when we connected to a neighbour.
598 static GNUNET_TRANSPORT_NotifyConnect connect_notify_cb;
601 * Function to call when we disconnected from a neighbour.
603 static GNUNET_TRANSPORT_NotifyDisconnect disconnect_notify_cb;
606 * Function to call when we changed an active address of a neighbour.
608 static GNUNET_TRANSPORT_PeerIterateCallback address_change_cb;
611 * counter for connected neighbours
613 static unsigned int neighbours_connected;
616 * Number of bytes we have currently queued for transmission.
618 static unsigned long long bytes_in_send_queue;
622 * Lookup a neighbour entry in the neighbours hash map.
624 * @param pid identity of the peer to look up
625 * @return the entry, NULL if there is no existing record
627 static struct NeighbourMapEntry *
628 lookup_neighbour (const struct GNUNET_PeerIdentity *pid)
630 if (NULL == neighbours)
632 return GNUNET_CONTAINER_multihashmap_get (neighbours, &pid->hashPubKey);
636 print_state (int state)
641 case S_NOT_CONNECTED:
642 return "S_NOT_CONNECTED";
647 case S_INIT_BLACKLIST:
648 return "S_INIT_BLACKLIST";
651 return "S_CONNECT_SENT";
653 case S_CONNECT_RECV_BLACKLIST_INBOUND:
654 return "S_CONNECT_RECV_BLACKLIST_INBOUND";
656 case S_CONNECT_RECV_ATS:
657 return "S_CONNECT_RECV_ATS";
659 case S_CONNECT_RECV_BLACKLIST:
660 return "S_CONNECT_RECV_BLACKLIST";
662 case S_CONNECT_RECV_ACK:
663 return "S_CONNECT_RECV_ACK";
666 return "S_CONNECTED";
668 case S_RECONNECT_ATS:
669 return "S_RECONNECT_ATS";
671 case S_RECONNECT_BLACKLIST:
672 return "S_RECONNECT_BLACKLIST";
674 case S_RECONNECT_SENT:
675 return "S_RECONNECT_SENT";
677 case S_CONNECTED_SWITCHING_BLACKLIST:
678 return "S_CONNECTED_SWITCHING_BLACKLIST";
680 case S_CONNECTED_SWITCHING_CONNECT_SENT:
681 return "S_CONNECTED_SWITCHING_CONNECT_SENT";
684 return "S_DISCONNECT";
686 case S_DISCONNECT_FINISHED:
687 return "S_DISCONNECT_FINISHED";
699 * Test if we're connected to the given peer.
701 * @param n neighbour entry of peer to test
702 * @return GNUNET_YES if we are connected, GNUNET_NO if not
705 test_connected (struct NeighbourMapEntry *n)
711 case S_NOT_CONNECTED:
713 case S_INIT_BLACKLIST:
715 case S_CONNECT_RECV_BLACKLIST_INBOUND:
716 case S_CONNECT_RECV_ATS:
717 case S_CONNECT_RECV_BLACKLIST:
718 case S_CONNECT_RECV_ACK:
721 case S_RECONNECT_ATS:
722 case S_RECONNECT_BLACKLIST:
723 case S_RECONNECT_SENT:
724 case S_CONNECTED_SWITCHING_BLACKLIST:
725 case S_CONNECTED_SWITCHING_CONNECT_SENT:
728 case S_DISCONNECT_FINISHED:
731 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
735 return GNUNET_SYSERR;
739 * Send information about a new outbound quota to our clients.
741 * @param target affected peer
742 * @param quota new quota
745 send_outbound_quota (const struct GNUNET_PeerIdentity *target,
746 struct GNUNET_BANDWIDTH_Value32NBO quota)
748 struct QuotaSetMessage q_msg;
750 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
751 "Sending outbound quota of %u Bps for peer `%s' to all clients\n",
752 ntohl (quota.value__), GNUNET_i2s (target));
753 q_msg.header.size = htons (sizeof (struct QuotaSetMessage));
754 q_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA);
756 q_msg.peer = (*target);
757 GST_clients_broadcast (&q_msg.header, GNUNET_NO);
762 * We don't need a given neighbour address any more.
763 * Release its resources and give appropriate notifications
764 * to ATS and other subsystems.
766 * @param na address we are done with; 'na' itself must NOT be 'free'd, only the contents!
769 free_address (struct NeighbourAddress *na)
771 if (GNUNET_YES == na->ats_active)
773 GST_validation_set_address_use (na->address, na->session, GNUNET_NO, __LINE__);
774 GNUNET_ATS_address_in_use (GST_ats, na->address, na->session, GNUNET_NO);
777 na->ats_active = GNUNET_NO;
778 if (NULL != na->address)
780 GNUNET_HELLO_address_free (na->address);
788 * Initialize the 'struct NeighbourAddress'.
790 * @param na neighbour address to initialize
791 * @param address address of the other peer, NULL if other peer
793 * @param session session to use (or NULL, in which case an
794 * address must be setup)
795 * @param bandwidth_in inbound quota to be used when connection is up
796 * @param bandwidth_out outbound quota to be used when connection is up
797 * @param is_active GNUNET_YES to mark this as the active address with ATS
800 set_address (struct NeighbourAddress *na,
801 const struct GNUNET_HELLO_Address *address,
802 struct Session *session,
803 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
804 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
807 struct GNUNET_TRANSPORT_PluginFunctions *papi;
809 if (NULL == (papi = GST_plugins_find (address->transport_name)))
814 if (session == na->session)
816 na->bandwidth_in = bandwidth_in;
817 na->bandwidth_out = bandwidth_out;
818 if (is_active != na->ats_active)
820 na->ats_active = is_active;
821 GNUNET_ATS_address_in_use (GST_ats, na->address, na->session, is_active);
822 GST_validation_set_address_use (na->address, na->session, is_active, __LINE__);
824 if (GNUNET_YES == is_active)
826 /* FIXME: is this the right place to set quotas? */
827 GST_neighbours_set_incoming_quota (&address->peer, bandwidth_in);
828 send_outbound_quota (&address->peer, bandwidth_out);
834 session = papi->get_session (papi->cls, address);
837 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
838 "Failed to obtain new session for peer `%s' and address '%s'\n",
839 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
840 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
843 na->address = GNUNET_HELLO_address_copy (address);
844 na->bandwidth_in = bandwidth_in;
845 na->bandwidth_out = bandwidth_out;
846 na->session = session;
847 na->ats_active = is_active;
848 if (GNUNET_YES == is_active)
850 /* Telling ATS about new session */
851 GNUNET_ATS_address_in_use (GST_ats, na->address, na->session, GNUNET_YES);
852 GST_validation_set_address_use (na->address, na->session, GNUNET_YES, __LINE__);
854 /* FIXME: is this the right place to set quotas? */
855 GST_neighbours_set_incoming_quota (&address->peer, bandwidth_in);
856 send_outbound_quota (&address->peer, bandwidth_out);
862 * Free a neighbour map entry.
864 * @param n entry to free
865 * @param keep_sessions GNUNET_NO to tell plugin to terminate sessions,
866 * GNUNET_YES to keep all sessions
869 free_neighbour (struct NeighbourMapEntry *n, int keep_sessions)
871 struct MessageQueue *mq;
872 struct GNUNET_TRANSPORT_PluginFunctions *papi;
874 n->is_active = NULL; /* always free'd by its own continuation! */
876 /* fail messages currently in the queue */
877 while (NULL != (mq = n->messages_head))
879 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
880 if (NULL != mq->cont)
881 mq->cont (mq->cont_cls, GNUNET_SYSERR);
884 /* It is too late to send other peer disconnect notifications, but at
885 least internally we need to get clean... */
886 if (GNUNET_YES == test_connected (n))
888 GNUNET_STATISTICS_set (GST_stats,
889 gettext_noop ("# peers connected"),
890 --neighbours_connected,
892 disconnect_notify_cb (callback_cls, &n->id);
895 /* FIXME-PLUGIN-API: This does not seem to guarantee that all
896 transport sessions eventually get killed due to inactivity; they
897 MUST have their own timeout logic (but at least TCP doesn't have
898 one yet). Are we sure that EVERY 'session' of a plugin is
899 actually cleaned up this way!? Note that if we are switching
900 between two TCP sessions to the same peer, the existing plugin
901 API gives us not even the means to selectively kill only one of
902 them! Killing all sessions like this seems to be very, very
904 if ((GNUNET_NO == keep_sessions) &&
905 (NULL != n->primary_address.address) &&
906 (NULL != (papi = GST_plugins_find (n->primary_address.address->transport_name))))
907 papi->disconnect (papi->cls, &n->id);
909 n->state = S_DISCONNECT_FINISHED;
911 GNUNET_assert (GNUNET_YES ==
912 GNUNET_CONTAINER_multihashmap_remove (neighbours,
913 &n->id.hashPubKey, n));
915 /* cut transport-level connection */
916 free_address (&n->primary_address);
917 free_address (&n->alternative_address);
919 // FIXME-ATS-API: we might want to be more specific about
920 // which states we do this from in the future (ATS should
921 // have given us a 'suggest_address' handle, and if we have
922 // such a handle, we should cancel the operation here!
923 GNUNET_ATS_suggest_address_cancel (GST_ats, &n->id);
925 if (GNUNET_SCHEDULER_NO_TASK != n->task)
927 GNUNET_SCHEDULER_cancel (n->task);
928 n->task = GNUNET_SCHEDULER_NO_TASK;
930 /* free rest of memory */
936 * Transmit a message using the current session of the given
939 * @param n entry for the recipient
940 * @param msgbuf buffer to transmit
941 * @param msgbuf_size number of bytes in buffer
942 * @param priority transmission priority
943 * @param timeout transmission timeout
944 * @param cont continuation to call when finished (can be NULL)
945 * @param cont_cls closure for cont
948 send_with_session (struct NeighbourMapEntry *n,
949 const char *msgbuf, size_t msgbuf_size,
951 struct GNUNET_TIME_Relative timeout,
952 GNUNET_TRANSPORT_TransmitContinuation cont,
955 struct GNUNET_TRANSPORT_PluginFunctions *papi;
957 GNUNET_assert (n->primary_address.session != NULL);
958 if ( ( (NULL == (papi = GST_plugins_find (n->primary_address.address->transport_name))) ||
959 (-1 == papi->send (papi->cls,
960 n->primary_address.session,
966 cont (cont_cls, &n->id, GNUNET_SYSERR);
967 GNUNET_break (NULL != papi);
972 * Master task run for every neighbour. Performs all of the time-related
973 * activities (keep alive, send next message, disconnect if idle, finish
974 * clean up after disconnect).
976 * @param cls the 'struct NeighbourMapEntry' for which we are running
977 * @param tc scheduler context (unused)
980 master_task (void *cls,
981 const struct GNUNET_SCHEDULER_TaskContext *tc);
985 * Function called when the 'DISCONNECT' message has been sent by the
986 * plugin. Frees the neighbour --- if the entry still exists.
989 * @param target identity of the neighbour that was disconnected
990 * @param result GNUNET_OK if the disconnect got out successfully
993 send_disconnect_cont (void *cls, const struct GNUNET_PeerIdentity *target,
996 struct NeighbourMapEntry *n;
998 n = lookup_neighbour (target);
1000 return; /* already gone */
1001 if (S_DISCONNECT != n->state)
1002 return; /* have created a fresh entry since */
1003 n->state = S_DISCONNECT;
1004 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1005 GNUNET_SCHEDULER_cancel (n->task);
1006 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1011 * Transmit a DISCONNECT message to the other peer.
1013 * @param n neighbour to send DISCONNECT message.
1016 send_disconnect (struct NeighbourMapEntry *n)
1018 struct SessionDisconnectMessage disconnect_msg;
1020 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1021 "Sending DISCONNECT message to peer `%4s'\n",
1022 GNUNET_i2s (&n->id));
1023 disconnect_msg.header.size = htons (sizeof (struct SessionDisconnectMessage));
1024 disconnect_msg.header.type =
1025 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1026 disconnect_msg.reserved = htonl (0);
1027 disconnect_msg.purpose.size =
1028 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
1029 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
1030 sizeof (struct GNUNET_TIME_AbsoluteNBO));
1031 disconnect_msg.purpose.purpose =
1032 htonl (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1033 disconnect_msg.timestamp =
1034 GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1035 disconnect_msg.public_key = GST_my_public_key;
1036 GNUNET_assert (GNUNET_OK ==
1037 GNUNET_CRYPTO_rsa_sign (GST_my_private_key,
1038 &disconnect_msg.purpose,
1039 &disconnect_msg.signature));
1041 send_with_session (n,
1042 (const char *) &disconnect_msg, sizeof (disconnect_msg),
1043 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
1044 &send_disconnect_cont, NULL);
1045 GNUNET_STATISTICS_update (GST_stats,
1047 ("# DISCONNECT messages sent"), 1,
1053 * Disconnect from the given neighbour, clean up the record.
1055 * @param n neighbour to disconnect from
1058 disconnect_neighbour (struct NeighbourMapEntry *n)
1060 /* depending on state, notify neighbour and/or upper layers of this peer
1064 case S_NOT_CONNECTED:
1066 case S_INIT_BLACKLIST:
1067 /* other peer is completely unaware of us, no need to send DISCONNECT */
1068 n->state = S_DISCONNECT_FINISHED;
1069 free_neighbour (n, GNUNET_NO);
1071 case S_CONNECT_SENT:
1072 send_disconnect (n);
1073 n->state = S_DISCONNECT;
1075 case S_CONNECT_RECV_BLACKLIST_INBOUND:
1076 case S_CONNECT_RECV_ATS:
1077 case S_CONNECT_RECV_BLACKLIST:
1078 /* we never ACK'ed the other peer's request, no need to send DISCONNECT */
1079 n->state = S_DISCONNECT_FINISHED;
1080 free_neighbour (n, GNUNET_NO);
1082 case S_CONNECT_RECV_ACK:
1083 /* we DID ACK the other peer's request, must send DISCONNECT */
1084 send_disconnect (n);
1085 n->state = S_DISCONNECT;
1088 case S_RECONNECT_BLACKLIST:
1089 case S_RECONNECT_SENT:
1090 case S_CONNECTED_SWITCHING_BLACKLIST:
1091 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1092 /* we are currently connected, need to send disconnect and do
1093 internal notifications and update statistics */
1094 send_disconnect (n);
1095 GNUNET_STATISTICS_set (GST_stats,
1096 gettext_noop ("# peers connected"),
1097 --neighbours_connected,
1099 disconnect_notify_cb (callback_cls, &n->id);
1100 n->state = S_DISCONNECT;
1102 case S_RECONNECT_ATS:
1103 /* ATS address request timeout, disconnect without sending disconnect message */
1104 GNUNET_STATISTICS_set (GST_stats,
1105 gettext_noop ("# peers connected"),
1106 --neighbours_connected,
1108 disconnect_notify_cb (callback_cls, &n->id);
1109 n->state = S_DISCONNECT;
1112 /* already disconnected, ignore */
1114 case S_DISCONNECT_FINISHED:
1115 /* already cleaned up, how did we get here!? */
1119 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1123 /* schedule timeout to clean up */
1124 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1125 GNUNET_SCHEDULER_cancel (n->task);
1126 n->task = GNUNET_SCHEDULER_add_delayed (DISCONNECT_SENT_TIMEOUT,
1132 * We're done with our transmission attempt, continue processing.
1134 * @param cls the 'struct MessageQueue' of the message
1135 * @param receiver intended receiver
1136 * @param success whether it worked or not
1139 transmit_send_continuation (void *cls,
1140 const struct GNUNET_PeerIdentity *receiver,
1143 struct MessageQueue *mq = cls;
1144 struct NeighbourMapEntry *n;
1146 if (NULL == (n = lookup_neighbour (receiver)))
1149 return; /* disconnect or other error while transmitting, can happen */
1151 if (n->is_active == mq)
1153 /* this is still "our" neighbour, remove us from its queue
1154 and allow it to send the next message now */
1155 n->is_active = NULL;
1156 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1157 GNUNET_SCHEDULER_cancel (n->task);
1158 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1160 GNUNET_assert (bytes_in_send_queue >= mq->message_buf_size);
1161 bytes_in_send_queue -= mq->message_buf_size;
1162 GNUNET_STATISTICS_set (GST_stats,
1164 ("# bytes in message queue for other peers"),
1165 bytes_in_send_queue, GNUNET_NO);
1166 if (GNUNET_OK == success)
1167 GNUNET_STATISTICS_update (GST_stats,
1169 ("# messages transmitted to other peers"),
1172 GNUNET_STATISTICS_update (GST_stats,
1174 ("# transmission failures for messages to other peers"),
1176 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1177 "Sending message to `%s' of type %u was a %s\n",
1178 GNUNET_i2s (receiver),
1179 ntohs (((struct GNUNET_MessageHeader *) mq->message_buf)->type),
1180 (success == GNUNET_OK) ? "success" : "FAILURE");
1181 if (NULL != mq->cont)
1182 mq->cont (mq->cont_cls, success);
1188 * Check the message list for the given neighbour and if we can
1189 * send a message, do so. This function should only be called
1190 * if the connection is at least generally ready for transmission.
1191 * While we will only send one message at a time, no bandwidth
1192 * quota management is performed here. If a message was given to
1193 * the plugin, the continuation will automatically re-schedule
1194 * the 'master' task once the next message might be transmitted.
1196 * @param n target peer for which to transmit
1199 try_transmission_to_peer (struct NeighbourMapEntry *n)
1201 struct MessageQueue *mq;
1202 struct GNUNET_TIME_Relative timeout;
1204 if (NULL == n->primary_address.address)
1206 /* no address, why are we here? */
1210 if ((0 == n->primary_address.address->address_length) &&
1211 (NULL == n->primary_address.session))
1213 /* no address, why are we here? */
1217 if (NULL != n->is_active)
1219 /* transmission already pending */
1223 /* timeout messages from the queue that are past their due date */
1224 while (NULL != (mq = n->messages_head))
1226 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1227 if (timeout.rel_value > 0)
1229 GNUNET_STATISTICS_update (GST_stats,
1231 ("# messages timed out while in transport queue"),
1233 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
1235 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR); /* timeout */
1238 return; /* no more messages */
1239 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
1241 send_with_session (n,
1242 mq->message_buf, mq->message_buf_size,
1243 0 /* priority */, timeout,
1244 &transmit_send_continuation, mq);
1249 * Send keepalive message to the neighbour. Must only be called
1250 * if we are on 'connected' state or while trying to switch addresses.
1251 * Will internally determine if a keepalive is truly needed (so can
1252 * always be called).
1254 * @param n neighbour that went idle and needs a keepalive
1257 send_keepalive (struct NeighbourMapEntry *n)
1259 struct GNUNET_MessageHeader m;
1261 GNUNET_assert ((S_CONNECTED == n->state) ||
1262 (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
1263 (S_CONNECTED_SWITCHING_CONNECT_SENT));
1264 if (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time).rel_value > 0)
1265 return; /* no keepalive needed at this time */
1266 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1267 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE);
1268 send_with_session (n,
1269 (const void *) &m, sizeof (m),
1270 UINT32_MAX /* priority */,
1271 KEEPALIVE_FREQUENCY,
1273 GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# keepalives sent"), 1,
1275 n->expect_latency_response = GNUNET_YES;
1276 n->last_keep_alive_time = GNUNET_TIME_absolute_get ();
1277 n->keep_alive_time = GNUNET_TIME_relative_to_absolute (KEEPALIVE_FREQUENCY);
1282 * Keep the connection to the given neighbour alive longer,
1283 * we received a KEEPALIVE (or equivalent); send a response.
1285 * @param neighbour neighbour to keep alive (by sending keep alive response)
1288 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
1290 struct NeighbourMapEntry *n;
1291 struct GNUNET_MessageHeader m;
1293 if (NULL == (n = lookup_neighbour (neighbour)))
1295 GNUNET_STATISTICS_update (GST_stats,
1297 ("# KEEPALIVE messages discarded (peer unknown)"),
1301 if (NULL == n->primary_address.session)
1303 GNUNET_STATISTICS_update (GST_stats,
1305 ("# KEEPALIVE messages discarded (no session)"),
1309 /* send reply to allow neighbour to measure latency */
1310 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1311 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE_RESPONSE);
1312 send_with_session(n,
1313 (const void *) &m, sizeof (m),
1314 UINT32_MAX /* priority */,
1315 KEEPALIVE_FREQUENCY,
1321 * We received a KEEP_ALIVE_RESPONSE message and use this to calculate
1322 * latency to this peer. Pass the updated information (existing ats
1323 * plus calculated latency) to ATS.
1325 * @param neighbour neighbour to keep alive
1326 * @param ats performance data
1327 * @param ats_count number of entries in ats
1330 GST_neighbours_keepalive_response (const struct GNUNET_PeerIdentity *neighbour,
1331 const struct GNUNET_ATS_Information *ats,
1334 struct NeighbourMapEntry *n;
1336 struct GNUNET_ATS_Information ats_new[ats_count + 1];
1338 if (NULL == (n = lookup_neighbour (neighbour)))
1340 GNUNET_STATISTICS_update (GST_stats,
1342 ("# KEEPALIVE_RESPONSE messages discarded (not connected)"),
1346 if ( (S_CONNECTED != n->state) ||
1347 (GNUNET_YES != n->expect_latency_response) )
1349 GNUNET_STATISTICS_update (GST_stats,
1351 ("# KEEPALIVE_RESPONSE messages discarded (not expected)"),
1355 n->expect_latency_response = GNUNET_NO;
1356 n->latency = GNUNET_TIME_absolute_get_duration (n->last_keep_alive_time);
1357 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1358 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1359 "Latency for peer `%s' is %llu ms\n",
1360 GNUNET_i2s (&n->id), n->latency.rel_value);
1361 memcpy (ats_new, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1362 /* append latency */
1363 ats_new[ats_count].type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
1364 if (n->latency.rel_value > UINT32_MAX)
1365 latency = UINT32_MAX;
1367 latency = n->latency.rel_value;
1368 ats_new[ats_count].value = htonl (latency);
1369 GNUNET_ATS_address_update (GST_ats,
1370 n->primary_address.address,
1371 n->primary_address.session, ats_new,
1377 * We have received a message from the given sender. How long should
1378 * we delay before receiving more? (Also used to keep the peer marked
1381 * @param sender sender of the message
1382 * @param size size of the message
1383 * @param do_forward set to GNUNET_YES if the message should be forwarded to clients
1384 * GNUNET_NO if the neighbour is not connected or violates the quota,
1385 * GNUNET_SYSERR if the connection is not fully up yet
1386 * @return how long to wait before reading more from this sender
1388 struct GNUNET_TIME_Relative
1389 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
1390 *sender, ssize_t size, int *do_forward)
1392 struct NeighbourMapEntry *n;
1393 struct GNUNET_TIME_Relative ret;
1395 if (NULL == neighbours)
1397 *do_forward = GNUNET_NO;
1398 return GNUNET_TIME_UNIT_FOREVER_REL; /* This can happen during shutdown */
1400 if (NULL == (n = lookup_neighbour (sender)))
1402 GST_neighbours_try_connect (sender);
1403 if (NULL == (n = lookup_neighbour (sender)))
1405 GNUNET_STATISTICS_update (GST_stats,
1407 ("# messages discarded due to lack of neighbour record"),
1409 *do_forward = GNUNET_NO;
1410 return GNUNET_TIME_UNIT_ZERO;
1413 if (! test_connected (n))
1415 *do_forward = GNUNET_SYSERR;
1416 return GNUNET_TIME_UNIT_ZERO;
1418 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
1420 n->quota_violation_count++;
1421 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1422 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
1423 n->in_tracker.available_bytes_per_s__,
1424 n->quota_violation_count);
1425 /* Discount 32k per violation */
1426 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
1430 if (n->quota_violation_count > 0)
1432 /* try to add 32k back */
1433 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
1434 n->quota_violation_count--;
1437 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
1439 GNUNET_STATISTICS_update (GST_stats,
1441 ("# bandwidth quota violations by other peers"),
1443 *do_forward = GNUNET_NO;
1444 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
1446 *do_forward = GNUNET_YES;
1447 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 32 * 1024);
1448 if (ret.rel_value > 0)
1450 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1451 "Throttling read (%llu bytes excess at %u b/s), waiting %llu ms before reading more.\n",
1452 (unsigned long long) n->in_tracker.
1453 consumption_since_last_update__,
1454 (unsigned int) n->in_tracker.available_bytes_per_s__,
1455 (unsigned long long) ret.rel_value);
1456 GNUNET_STATISTICS_update (GST_stats,
1457 gettext_noop ("# ms throttling suggested"),
1458 (int64_t) ret.rel_value, GNUNET_NO);
1465 * Transmit a message to the given target using the active connection.
1467 * @param target destination
1468 * @param msg message to send
1469 * @param msg_size number of bytes in msg
1470 * @param timeout when to fail with timeout
1471 * @param cont function to call when done
1472 * @param cont_cls closure for 'cont'
1475 GST_neighbours_send (const struct GNUNET_PeerIdentity *target, const void *msg,
1476 size_t msg_size, struct GNUNET_TIME_Relative timeout,
1477 GST_NeighbourSendContinuation cont, void *cont_cls)
1479 struct NeighbourMapEntry *n;
1480 struct MessageQueue *mq;
1482 /* All ove these cases should never happen; they are all API violations.
1483 But we check anyway, just to be sure. */
1484 if (NULL == (n = lookup_neighbour (target)))
1488 cont (cont_cls, GNUNET_SYSERR);
1491 if (GNUNET_YES != test_connected (n))
1495 cont (cont_cls, GNUNET_SYSERR);
1498 bytes_in_send_queue += msg_size;
1499 GNUNET_STATISTICS_set (GST_stats,
1501 ("# bytes in message queue for other peers"),
1502 bytes_in_send_queue, GNUNET_NO);
1503 mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
1505 mq->cont_cls = cont_cls;
1506 memcpy (&mq[1], msg, msg_size);
1507 mq->message_buf = (const char *) &mq[1];
1508 mq->message_buf_size = msg_size;
1509 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1510 GNUNET_CONTAINER_DLL_insert_tail (n->messages_head, n->messages_tail, mq);
1511 if ( (NULL != n->is_active) ||
1512 ( (NULL == n->primary_address.session) && (NULL == n->primary_address.address)) )
1514 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1515 GNUNET_SCHEDULER_cancel (n->task);
1516 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1521 * Send a SESSION_CONNECT message via the given address.
1523 * @param na address to use
1526 send_session_connect (struct NeighbourAddress *na)
1528 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1529 struct SessionConnectMessage connect_msg;
1531 if (NULL == (papi = GST_plugins_find (na->address->transport_name)))
1536 if (NULL == na->session)
1537 na->session = papi->get_session (papi->cls, na->address);
1538 if (NULL == na->session)
1543 na->connect_timestamp = GNUNET_TIME_absolute_get ();
1544 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1545 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
1546 connect_msg.reserved = htonl (0);
1547 connect_msg.timestamp = GNUNET_TIME_absolute_hton (na->connect_timestamp);
1548 (void) papi->send (papi->cls,
1550 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1552 GNUNET_TIME_UNIT_FOREVER_REL,
1558 * Send a SESSION_CONNECT_ACK message via the given address.
1560 * @param address address to use
1561 * @param session session to use
1562 * @param timestamp timestamp to use for the ACK message
1565 send_session_connect_ack_message (const struct GNUNET_HELLO_Address *address,
1566 struct Session *session,
1567 struct GNUNET_TIME_Absolute timestamp)
1569 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1570 struct SessionConnectMessage connect_msg;
1572 if (NULL == (papi = GST_plugins_find (address->transport_name)))
1577 if (NULL == session)
1578 session = papi->get_session (papi->cls, address);
1579 if (NULL == session)
1584 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1585 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT_ACK);
1586 connect_msg.reserved = htonl (0);
1587 connect_msg.timestamp = GNUNET_TIME_absolute_hton (timestamp);
1588 (void) papi->send (papi->cls,
1590 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1592 GNUNET_TIME_UNIT_FOREVER_REL,
1598 * Create a fresh entry in the neighbour map for the given peer
1600 * @param peer peer to create an entry for
1601 * @return new neighbour map entry
1603 static struct NeighbourMapEntry *
1604 setup_neighbour (const struct GNUNET_PeerIdentity *peer)
1606 struct NeighbourMapEntry *n;
1608 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1609 "Creating new neighbour entry for `%s'\n",
1611 n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
1613 n->state = S_NOT_CONNECTED;
1614 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
1615 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
1616 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
1617 MAX_BANDWIDTH_CARRY_S);
1618 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1619 GNUNET_assert (GNUNET_OK ==
1620 GNUNET_CONTAINER_multihashmap_put (neighbours,
1621 &n->id.hashPubKey, n,
1622 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1628 * Check if the two given addresses are the same.
1629 * Actually only checks if the sessions are non-NULL
1630 * (which they should be) and then if they are identical;
1631 * the actual addresses don't matter if the session
1632 * pointers match anyway, and we must have session pointers
1635 * @param a1 first address to compare
1636 * @param a2 other address to compare
1637 * @return GNUNET_NO if the addresses do not match, GNUNET_YES if they do match
1640 address_matches (const struct NeighbourAddress *a1,
1641 const struct NeighbourAddress *a2)
1643 if ( (NULL == a1->session) ||
1644 (NULL == a2->session) )
1649 return (a1->session == a2->session) ? GNUNET_YES : GNUNET_NO;
1654 * Try to create a connection to the given target (eventually).
1656 * @param target peer to try to connect to
1659 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
1661 struct NeighbourMapEntry *n;
1663 if (NULL == neighbours)
1664 return; /* during shutdown, do nothing */
1665 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1666 "Asked to connect to peer `%s'\n",
1667 GNUNET_i2s (target));
1669 memcmp (target, &GST_my_identity, sizeof (struct GNUNET_PeerIdentity)))
1671 /* refuse to connect to myself */
1672 /* FIXME: can this happen? Is this not an API violation? */
1673 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1674 "Refusing to try to connect to myself.\n");
1677 n = lookup_neighbour (target);
1682 case S_NOT_CONNECTED:
1683 /* this should not be possible */
1685 free_neighbour (n, GNUNET_NO);
1688 case S_INIT_BLACKLIST:
1689 case S_CONNECT_SENT:
1690 case S_CONNECT_RECV_BLACKLIST_INBOUND:
1691 case S_CONNECT_RECV_ATS:
1692 case S_CONNECT_RECV_BLACKLIST:
1693 case S_CONNECT_RECV_ACK:
1694 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1695 "Ignoring request to try to connect to `%s', already trying!\n",
1696 GNUNET_i2s (target));
1697 return; /* already trying */
1699 case S_RECONNECT_ATS:
1700 case S_RECONNECT_BLACKLIST:
1701 case S_RECONNECT_SENT:
1702 case S_CONNECTED_SWITCHING_BLACKLIST:
1703 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1704 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1705 "Ignoring request to try to connect, already connected to `%s'!\n",
1706 GNUNET_i2s (target));
1707 return; /* already connected */
1709 /* get rid of remains, ready to re-try immediately */
1710 free_neighbour (n, GNUNET_NO);
1712 case S_DISCONNECT_FINISHED:
1713 /* should not be possible */
1716 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1718 free_neighbour (n, GNUNET_NO);
1722 n = setup_neighbour (target);
1723 n->state = S_INIT_ATS;
1724 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1726 GNUNET_ATS_reset_backoff (GST_ats, target);
1727 GNUNET_ATS_suggest_address (GST_ats, target);
1732 * Function called with the result of a blacklist check.
1734 * @param cls closure with the 'struct BlackListCheckContext'
1735 * @param peer peer this check affects
1736 * @param result GNUNET_OK if the address is allowed
1739 handle_test_blacklist_cont (void *cls,
1740 const struct GNUNET_PeerIdentity *peer,
1743 struct BlackListCheckContext *bcc = cls;
1744 struct NeighbourMapEntry *n;
1747 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1748 "Connection to new address of peer `%s' based on blacklist is `%s'\n",
1750 (GNUNET_OK == result) ? "allowed" : "FORBIDDEN");
1751 if (NULL == (n = lookup_neighbour (peer)))
1752 goto cleanup; /* nobody left to care about new address */
1755 case S_NOT_CONNECTED:
1756 /* this should not be possible */
1758 free_neighbour (n, GNUNET_NO);
1761 /* still waiting on ATS suggestion */
1763 case S_INIT_BLACKLIST:
1764 /* check if the address the blacklist was fine with matches
1765 ATS suggestion, if so, we can move on! */
1766 if ( (GNUNET_OK == result) &&
1767 (1 == n->send_connect_ack) )
1769 n->send_connect_ack = 2;
1770 send_session_connect_ack_message (bcc->na.address,
1772 n->connect_ack_timestamp);
1774 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1775 break; /* result for an address we currently don't care about */
1776 if (GNUNET_OK == result)
1778 n->timeout = GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT);
1779 n->state = S_CONNECT_SENT;
1780 send_session_connect (&n->primary_address);
1784 // FIXME: should also possibly destroy session with plugin!?
1785 GNUNET_ATS_address_destroyed (GST_ats,
1788 free_address (&n->primary_address);
1789 n->state = S_INIT_ATS;
1790 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1791 // FIXME: do we need to ask ATS again for suggestions?
1792 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1795 case S_CONNECT_SENT:
1796 /* waiting on CONNECT_ACK, send ACK if one is pending */
1797 if ( (GNUNET_OK == result) &&
1798 (1 == n->send_connect_ack) )
1800 n->send_connect_ack = 2;
1801 send_session_connect_ack_message (n->primary_address.address,
1802 n->primary_address.session,
1803 n->connect_ack_timestamp);
1806 case S_CONNECT_RECV_BLACKLIST_INBOUND:
1807 if (GNUNET_OK == result)
1809 /* valid new address, let ATS know! */
1810 GNUNET_ATS_address_add (GST_ats,
1813 bcc->ats, bcc->ats_count);
1815 n->state = S_CONNECT_RECV_ATS;
1816 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1817 GNUNET_ATS_reset_backoff (GST_ats, peer);
1818 GNUNET_ATS_suggest_address (GST_ats, peer);
1820 case S_CONNECT_RECV_ATS:
1821 /* still waiting on ATS suggestion, don't care about blacklist */
1823 case S_CONNECT_RECV_BLACKLIST:
1824 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1825 break; /* result for an address we currently don't care about */
1826 if (GNUNET_OK == result)
1828 n->timeout = GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT);
1829 n->state = S_CONNECT_RECV_ACK;
1830 send_session_connect_ack_message (bcc->na.address,
1832 n->connect_ack_timestamp);
1833 if (1 == n->send_connect_ack)
1834 n->send_connect_ack = 2;
1838 // FIXME: should also possibly destroy session with plugin!?
1839 GNUNET_ATS_address_destroyed (GST_ats,
1842 free_address (&n->primary_address);
1843 n->state = S_INIT_ATS;
1844 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1845 // FIXME: do we need to ask ATS again for suggestions?
1846 GNUNET_ATS_reset_backoff (GST_ats, peer);
1847 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1850 case S_CONNECT_RECV_ACK:
1851 /* waiting on SESSION_ACK, send ACK if one is pending */
1852 if ( (GNUNET_OK == result) &&
1853 (1 == n->send_connect_ack) )
1855 n->send_connect_ack = 2;
1856 send_session_connect_ack_message (n->primary_address.address,
1857 n->primary_address.session,
1858 n->connect_ack_timestamp);
1862 /* already connected, don't care about blacklist */
1864 case S_RECONNECT_ATS:
1865 /* still waiting on ATS suggestion, don't care about blacklist */
1867 case S_RECONNECT_BLACKLIST:
1868 if ( (GNUNET_OK == result) &&
1869 (1 == n->send_connect_ack) )
1871 n->send_connect_ack = 2;
1872 send_session_connect_ack_message (bcc->na.address,
1874 n->connect_ack_timestamp);
1876 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1877 break; /* result for an address we currently don't care about */
1878 if (GNUNET_OK == result)
1880 send_session_connect (&n->primary_address);
1881 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
1882 n->state = S_RECONNECT_SENT;
1886 GNUNET_ATS_address_destroyed (GST_ats,
1889 n->state = S_RECONNECT_ATS;
1890 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1891 // FIXME: do we need to ask ATS again for suggestions?
1892 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1895 case S_RECONNECT_SENT:
1896 /* waiting on CONNECT_ACK, don't care about blacklist */
1897 if ( (GNUNET_OK == result) &&
1898 (1 == n->send_connect_ack) )
1900 n->send_connect_ack = 2;
1901 send_session_connect_ack_message (n->primary_address.address,
1902 n->primary_address.session,
1903 n->connect_ack_timestamp);
1906 case S_CONNECTED_SWITCHING_BLACKLIST:
1907 if (GNUNET_YES != address_matches (&bcc->na, &n->alternative_address))
1908 break; /* result for an address we currently don't care about */
1909 if (GNUNET_OK == result)
1911 send_session_connect (&n->alternative_address);
1912 n->state = S_CONNECTED_SWITCHING_CONNECT_SENT;
1916 GNUNET_ATS_address_destroyed (GST_ats,
1919 free_address (&n->alternative_address);
1920 n->state = S_CONNECTED;
1923 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1924 /* waiting on CONNECT_ACK, don't care about blacklist */
1925 if ( (GNUNET_OK == result) &&
1926 (1 == n->send_connect_ack) )
1928 n->send_connect_ack = 2;
1929 send_session_connect_ack_message (n->primary_address.address,
1930 n->primary_address.session,
1931 n->connect_ack_timestamp);
1935 /* Nothing to do here, ATS will already do what can be done */
1937 case S_DISCONNECT_FINISHED:
1938 /* should not be possible */
1942 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1944 free_neighbour (n, GNUNET_NO);
1948 GNUNET_HELLO_address_free (bcc->na.address);
1949 GNUNET_CONTAINER_DLL_remove (bc_head,
1957 * We want to know if connecting to a particular peer via
1958 * a particular address is allowed. Check it!
1960 * @param peer identity of the peer to switch the address for
1961 * @param ts time at which the check was initiated
1962 * @param address address of the other peer, NULL if other peer
1964 * @param session session to use (or NULL)
1965 * @param ats performance data
1966 * @param ats_count number of entries in ats (excluding 0-termination)
1969 check_blacklist (const struct GNUNET_PeerIdentity *peer,
1970 struct GNUNET_TIME_Absolute ts,
1971 const struct GNUNET_HELLO_Address *address,
1972 struct Session *session,
1973 const struct GNUNET_ATS_Information *ats,
1976 struct BlackListCheckContext *bcc;
1977 struct GST_BlacklistCheck *bc;
1980 GNUNET_malloc (sizeof (struct BlackListCheckContext) +
1981 sizeof (struct GNUNET_ATS_Information) * ats_count);
1982 bcc->ats_count = ats_count;
1983 bcc->na.address = GNUNET_HELLO_address_copy (address);
1984 bcc->na.session = session;
1985 bcc->na.connect_timestamp = ts;
1986 bcc->ats = (struct GNUNET_ATS_Information *) &bcc[1];
1987 memcpy (bcc->ats, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1988 GNUNET_CONTAINER_DLL_insert (bc_head,
1991 if (NULL != (bc = GST_blacklist_test_allowed (peer,
1992 address->transport_name,
1993 &handle_test_blacklist_cont, bcc)))
1995 /* if NULL == bc, 'cont' was already called and 'bcc' already free'd, so
1996 we must only store 'bc' if 'bc' is non-NULL... */
2001 * We received a 'SESSION_CONNECT' message from the other peer.
2002 * Consider switching to it.
2004 * @param message possibly a 'struct SessionConnectMessage' (check format)
2005 * @param peer identity of the peer to switch the address for
2006 * @param address address of the other peer, NULL if other peer
2008 * @param session session to use (or NULL)
2009 * @param ats performance data
2010 * @param ats_count number of entries in ats (excluding 0-termination)
2013 GST_neighbours_handle_connect (const struct GNUNET_MessageHeader *message,
2014 const struct GNUNET_PeerIdentity *peer,
2015 const struct GNUNET_HELLO_Address *address,
2016 struct Session *session,
2017 const struct GNUNET_ATS_Information *ats,
2020 const struct SessionConnectMessage *scm;
2021 struct NeighbourMapEntry *n;
2022 struct GNUNET_TIME_Absolute ts;
2024 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2025 "Received CONNECT message from peer `%s'\n",
2028 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2030 GNUNET_break_op (0);
2033 if (NULL == neighbours)
2034 return; /* we're shutting down */
2035 scm = (const struct SessionConnectMessage *) message;
2036 GNUNET_break_op (0 == ntohl (scm->reserved));
2037 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2038 n = lookup_neighbour (peer);
2040 n = setup_neighbour (peer);
2041 n->send_connect_ack = 1;
2042 n->connect_ack_timestamp = ts;
2046 case S_NOT_CONNECTED:
2047 n->state = S_CONNECT_RECV_BLACKLIST_INBOUND;
2048 /* Do a blacklist check for the new address */
2049 check_blacklist (peer, ts, address, session, ats, ats_count);
2052 /* CONNECT message takes priority over us asking ATS for address */
2053 n->state = S_CONNECT_RECV_BLACKLIST_INBOUND;
2055 case S_INIT_BLACKLIST:
2056 case S_CONNECT_SENT:
2057 case S_CONNECT_RECV_ATS:
2058 case S_CONNECT_RECV_BLACKLIST:
2059 case S_CONNECT_RECV_ACK:
2060 /* It can never hurt to have an alternative address in the above cases,
2061 see if it is allowed */
2062 check_blacklist (peer, ts, address, session, ats, ats_count);
2065 /* we are already connected and can thus send the ACK immediately;
2066 still, it can never hurt to have an alternative address, so also
2067 tell ATS about it */
2068 GNUNET_assert (NULL != n->primary_address.address);
2069 GNUNET_assert (NULL != n->primary_address.session);
2070 n->send_connect_ack = 0;
2071 send_session_connect_ack_message (n->primary_address.address,
2072 n->primary_address.session, ts);
2073 check_blacklist (peer, ts, address, session, ats, ats_count);
2075 case S_RECONNECT_ATS:
2076 case S_RECONNECT_BLACKLIST:
2077 case S_RECONNECT_SENT:
2078 /* It can never hurt to have an alternative address in the above cases,
2079 see if it is allowed */
2080 check_blacklist (peer, ts, address, session, ats, ats_count);
2082 case S_CONNECTED_SWITCHING_BLACKLIST:
2083 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2084 /* we are already connected and can thus send the ACK immediately;
2085 still, it can never hurt to have an alternative address, so also
2086 tell ATS about it */
2087 GNUNET_assert (NULL != n->primary_address.address);
2088 GNUNET_assert (NULL != n->primary_address.session);
2089 n->send_connect_ack = 0;
2090 send_session_connect_ack_message (n->primary_address.address,
2091 n->primary_address.session, ts);
2092 check_blacklist (peer, ts, address, session, ats, ats_count);
2095 /* get rid of remains without terminating sessions, ready to re-try */
2096 free_neighbour (n, GNUNET_YES);
2097 n = setup_neighbour (peer);
2098 n->state = S_CONNECT_RECV_ATS;
2099 GNUNET_ATS_reset_backoff (GST_ats, peer);
2100 GNUNET_ATS_suggest_address (GST_ats, peer);
2102 case S_DISCONNECT_FINISHED:
2103 /* should not be possible */
2107 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2109 free_neighbour (n, GNUNET_NO);
2116 * For an existing neighbour record, set the active connection to
2117 * use the given address.
2119 * @param peer identity of the peer to switch the address for
2120 * @param address address of the other peer, NULL if other peer
2122 * @param session session to use (or NULL)
2123 * @param ats performance data
2124 * @param ats_count number of entries in ats
2125 * @param bandwidth_in inbound quota to be used when connection is up
2126 * @param bandwidth_out outbound quota to be used when connection is up
2129 GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
2130 const struct GNUNET_HELLO_Address *address,
2131 struct Session *session,
2132 const struct GNUNET_ATS_Information *ats,
2134 struct GNUNET_BANDWIDTH_Value32NBO
2136 struct GNUNET_BANDWIDTH_Value32NBO
2139 struct NeighbourMapEntry *n;
2140 struct GNUNET_TRANSPORT_PluginFunctions *papi;
2142 GNUNET_assert (address->transport_name != NULL);
2143 if (NULL == (n = lookup_neighbour (peer)))
2146 /* Obtain an session for this address from plugin */
2147 if (NULL == (papi = GST_plugins_find (address->transport_name)))
2149 /* we don't have the plugin for this address */
2150 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2153 if ((NULL == session) && (0 == address->address_length))
2156 if (strlen (address->transport_name) > 0)
2157 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2161 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2162 "ATS tells us to switch to address '%s' session %p for peer `%s' in state %s\n",
2163 (address->address_length != 0) ? GST_plugins_a2s (address): "<inbound>",
2166 print_state (n->state));
2168 if (NULL == session)
2170 session = papi->get_session (papi->cls, address);
2171 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2172 "Obtained new session for peer `%s' and address '%s': %p\n",
2173 GNUNET_i2s (&address->peer), GST_plugins_a2s (address), session);
2175 if (NULL == session)
2177 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2178 "Failed to obtain new session for peer `%s' and address '%s'\n",
2179 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
2180 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2185 case S_NOT_CONNECTED:
2187 free_neighbour (n, GNUNET_NO);
2190 set_address (&n->primary_address,
2191 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2192 n->state = S_INIT_BLACKLIST;
2193 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2194 check_blacklist (&n->id,
2195 n->connect_ack_timestamp,
2196 address, session, ats, ats_count);
2198 case S_INIT_BLACKLIST:
2199 /* ATS suggests a different address, switch again */
2200 set_address (&n->primary_address,
2201 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2202 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2203 check_blacklist (&n->id,
2204 n->connect_ack_timestamp,
2205 address, session, ats, ats_count);
2207 case S_CONNECT_SENT:
2208 /* ATS suggests a different address, switch again */
2209 set_address (&n->primary_address,
2210 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2211 n->state = S_INIT_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_CONNECT_RECV_ATS:
2218 set_address (&n->primary_address,
2219 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2220 n->state = S_CONNECT_RECV_BLACKLIST;
2221 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2222 check_blacklist (&n->id,
2223 n->connect_ack_timestamp,
2224 address, session, ats, ats_count);
2226 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2227 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2228 check_blacklist (&n->id,
2229 n->connect_ack_timestamp,
2230 address, session, ats, ats_count);
2232 case S_CONNECT_RECV_BLACKLIST:
2233 case S_CONNECT_RECV_ACK:
2234 /* ATS asks us to switch while we were trying to connect; switch to new
2235 address and check blacklist again */
2236 set_address (&n->primary_address,
2237 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2238 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2239 check_blacklist (&n->id,
2240 n->connect_ack_timestamp,
2241 address, session, ats, ats_count);
2244 GNUNET_assert (NULL != n->primary_address.address);
2245 GNUNET_assert (NULL != n->primary_address.session);
2246 if (n->primary_address.session == session)
2248 /* not an address change, just a quota change */
2249 set_address (&n->primary_address,
2250 address, session, bandwidth_in, bandwidth_out, GNUNET_YES);
2253 /* ATS asks us to switch a life connection; see if we can get
2254 a CONNECT_ACK on it before we actually do this! */
2255 set_address (&n->alternative_address,
2256 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2257 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2258 check_blacklist (&n->id,
2259 GNUNET_TIME_absolute_get (),
2260 address, session, ats, ats_count);
2262 case S_RECONNECT_ATS:
2263 set_address (&n->primary_address,
2264 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2265 n->state = S_RECONNECT_BLACKLIST;
2266 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2267 check_blacklist (&n->id,
2268 n->connect_ack_timestamp,
2269 address, session, ats, ats_count);
2271 case S_RECONNECT_BLACKLIST:
2272 /* ATS asks us to switch while we were trying to reconnect; switch to new
2273 address and check blacklist again */
2274 set_address (&n->primary_address,
2275 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2276 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2277 check_blacklist (&n->id,
2278 n->connect_ack_timestamp,
2279 address, session, ats, ats_count);
2281 case S_RECONNECT_SENT:
2282 /* ATS asks us to switch while we were trying to reconnect; switch to new
2283 address and check blacklist again */
2284 set_address (&n->primary_address,
2285 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2286 n->state = S_RECONNECT_BLACKLIST;
2287 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2288 check_blacklist (&n->id,
2289 n->connect_ack_timestamp,
2290 address, session, ats, ats_count);
2292 case S_CONNECTED_SWITCHING_BLACKLIST:
2293 if (n->primary_address.session == session)
2295 /* ATS switches back to still-active session */
2296 free_address (&n->alternative_address);
2297 n->state = S_CONNECTED;
2300 /* ATS asks us to switch a life connection, update blacklist check */
2301 set_address (&n->alternative_address,
2302 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2303 check_blacklist (&n->id,
2304 GNUNET_TIME_absolute_get (),
2305 address, session, ats, ats_count);
2307 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2308 if (n->primary_address.session == session)
2310 /* ATS switches back to still-active session */
2311 free_address (&n->alternative_address);
2312 n->state = S_CONNECTED;
2315 /* ATS asks us to switch a life connection, update blacklist check */
2316 set_address (&n->alternative_address,
2317 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2318 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2319 check_blacklist (&n->id,
2320 GNUNET_TIME_absolute_get (),
2321 address, session, ats, ats_count);
2324 /* not going to switch addresses while disconnecting */
2326 case S_DISCONNECT_FINISHED:
2330 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2338 * Master task run for every neighbour. Performs all of the time-related
2339 * activities (keep alive, send next message, disconnect if idle, finish
2340 * clean up after disconnect).
2342 * @param cls the 'struct NeighbourMapEntry' for which we are running
2343 * @param tc scheduler context (unused)
2346 master_task (void *cls,
2347 const struct GNUNET_SCHEDULER_TaskContext *tc)
2349 struct NeighbourMapEntry *n = cls;
2350 struct GNUNET_TIME_Relative delay;
2352 n->task = GNUNET_SCHEDULER_NO_TASK;
2353 delay = GNUNET_TIME_absolute_get_remaining (n->timeout);
2354 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2355 "Master task runs for neighbour `%s' in state %s with timeout in %llu ms\n",
2356 GNUNET_i2s (&n->id),
2357 print_state(n->state),
2358 (unsigned long long) delay.rel_value);
2361 case S_NOT_CONNECTED:
2362 /* invalid state for master task, clean up */
2364 n->state = S_DISCONNECT_FINISHED;
2365 free_neighbour (n, GNUNET_NO);
2368 if (0 == delay.rel_value)
2370 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2371 "Connection to `%s' timed out waiting for ATS to provide address\n",
2372 GNUNET_i2s (&n->id));
2373 n->state = S_DISCONNECT_FINISHED;
2374 free_neighbour (n, GNUNET_NO);
2378 case S_INIT_BLACKLIST:
2379 if (0 == delay.rel_value)
2381 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2382 "Connection to `%s' timed out waiting for BLACKLIST to approve address\n",
2383 GNUNET_i2s (&n->id));
2384 n->state = S_DISCONNECT_FINISHED;
2385 free_neighbour (n, GNUNET_NO);
2389 case S_CONNECT_SENT:
2390 if (0 == delay.rel_value)
2392 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2393 "Connection to `%s' timed out waiting for other peer to send CONNECT_ACK\n",
2394 GNUNET_i2s (&n->id));
2395 disconnect_neighbour (n);
2399 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2400 if (0 == delay.rel_value)
2402 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2403 "Connection to `%s' timed out waiting BLACKLIST to approve address to use for received CONNECT\n",
2404 GNUNET_i2s (&n->id));
2405 n->state = S_DISCONNECT_FINISHED;
2406 free_neighbour (n, GNUNET_NO);
2410 case S_CONNECT_RECV_ATS:
2411 if (0 == delay.rel_value)
2413 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2414 "Connection to `%s' timed out waiting ATS to provide address to use for CONNECT_ACK\n",
2415 GNUNET_i2s (&n->id));
2416 n->state = S_DISCONNECT_FINISHED;
2417 free_neighbour (n, GNUNET_NO);
2421 case S_CONNECT_RECV_BLACKLIST:
2422 if (0 == delay.rel_value)
2424 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2425 "Connection to `%s' timed out waiting BLACKLIST to approve address to use for CONNECT_ACK\n",
2426 GNUNET_i2s (&n->id));
2427 n->state = S_DISCONNECT_FINISHED;
2428 free_neighbour (n, GNUNET_NO);
2432 case S_CONNECT_RECV_ACK:
2433 if (0 == delay.rel_value)
2435 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2436 "Connection to `%s' timed out waiting for other peer to send SESSION_ACK\n",
2437 GNUNET_i2s (&n->id));
2438 disconnect_neighbour (n);
2443 if (0 == delay.rel_value)
2445 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2446 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2447 GNUNET_i2s (&n->id));
2448 disconnect_neighbour (n);
2451 try_transmission_to_peer (n);
2454 case S_RECONNECT_ATS:
2455 if (0 == delay.rel_value)
2457 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2458 "Connection to `%s' timed out, waiting for ATS replacement address\n",
2459 GNUNET_i2s (&n->id));
2460 disconnect_neighbour (n);
2464 case S_RECONNECT_BLACKLIST:
2465 if (0 == delay.rel_value)
2467 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2468 "Connection to `%s' timed out, waiting for BLACKLIST to approve replacement address\n",
2469 GNUNET_i2s (&n->id));
2470 disconnect_neighbour (n);
2474 case S_RECONNECT_SENT:
2475 if (0 == delay.rel_value)
2477 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2478 "Connection to `%s' timed out, waiting for other peer to CONNECT_ACK replacement address\n",
2479 GNUNET_i2s (&n->id));
2480 disconnect_neighbour (n);
2484 case S_CONNECTED_SWITCHING_BLACKLIST:
2485 if (0 == delay.rel_value)
2487 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2488 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2489 GNUNET_i2s (&n->id));
2490 disconnect_neighbour (n);
2493 try_transmission_to_peer (n);
2496 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2497 if (0 == delay.rel_value)
2499 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2500 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs (after trying to CONNECT on alternative address)\n",
2501 GNUNET_i2s (&n->id));
2502 disconnect_neighbour (n);
2505 try_transmission_to_peer (n);
2509 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2510 "Cleaning up connection to `%s' after sending DISCONNECT\n",
2511 GNUNET_i2s (&n->id));
2512 free_neighbour (n, GNUNET_NO);
2514 case S_DISCONNECT_FINISHED:
2515 /* how did we get here!? */
2519 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2523 if ( (S_CONNECTED_SWITCHING_CONNECT_SENT == n->state) ||
2524 (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
2525 (S_CONNECTED == n->state) )
2527 /* if we are *now* in one of these three states, we're sending
2528 keep alive messages, so we need to consider the keepalive
2529 delay, not just the connection timeout */
2530 delay = GNUNET_TIME_relative_min (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time),
2533 if (GNUNET_SCHEDULER_NO_TASK == n->task)
2534 n->task = GNUNET_SCHEDULER_add_delayed (delay,
2541 * Send a SESSION_ACK message to the neighbour to confirm that we
2542 * got his CONNECT_ACK.
2544 * @param n neighbour to send the SESSION_ACK to
2547 send_session_ack_message (struct NeighbourMapEntry *n)
2549 struct GNUNET_MessageHeader msg;
2551 msg.size = htons (sizeof (struct GNUNET_MessageHeader));
2552 msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK);
2553 (void) send_with_session(n,
2554 (const char *) &msg, sizeof (struct GNUNET_MessageHeader),
2555 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
2561 * We received a 'SESSION_CONNECT_ACK' message from the other peer.
2562 * Consider switching to it.
2564 * @param message possibly a 'struct SessionConnectMessage' (check format)
2565 * @param peer identity of the peer to switch the address for
2566 * @param address address of the other peer, NULL if other peer
2568 * @param session session to use (or NULL)
2569 * @param ats performance data
2570 * @param ats_count number of entries in ats
2573 GST_neighbours_handle_connect_ack (const struct GNUNET_MessageHeader *message,
2574 const struct GNUNET_PeerIdentity *peer,
2575 const struct GNUNET_HELLO_Address *address,
2576 struct Session *session,
2577 const struct GNUNET_ATS_Information *ats,
2580 const struct SessionConnectMessage *scm;
2581 struct GNUNET_TIME_Absolute ts;
2582 struct NeighbourMapEntry *n;
2584 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2585 "Received CONNECT_ACK message from peer `%s'\n",
2588 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2590 GNUNET_break_op (0);
2593 scm = (const struct SessionConnectMessage *) message;
2594 GNUNET_break_op (ntohl (scm->reserved) == 0);
2595 if (NULL == (n = lookup_neighbour (peer)))
2597 GNUNET_STATISTICS_update (GST_stats,
2599 ("# unexpected CONNECT_ACK messages (no peer)"),
2603 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2606 case S_NOT_CONNECTED:
2608 free_neighbour (n, GNUNET_NO);
2611 case S_INIT_BLACKLIST:
2612 GNUNET_STATISTICS_update (GST_stats,
2614 ("# unexpected CONNECT_ACK messages (not ready)"),
2617 case S_CONNECT_SENT:
2618 if (ts.abs_value != n->primary_address.connect_timestamp.abs_value)
2619 break; /* ACK does not match our original CONNECT message */
2620 n->state = S_CONNECTED;
2621 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2622 GNUNET_STATISTICS_set (GST_stats,
2623 gettext_noop ("# peers connected"),
2624 ++neighbours_connected,
2626 connect_notify_cb (callback_cls, &n->id, ats, ats_count);
2627 /* Tell ATS that the outbound session we created to send CONNECT was successfull */
2628 GNUNET_ATS_address_add (GST_ats,
2629 n->primary_address.address,
2630 n->primary_address.session,
2632 set_address (&n->primary_address,
2633 n->primary_address.address,
2634 n->primary_address.session,
2635 n->primary_address.bandwidth_in,
2636 n->primary_address.bandwidth_out,
2638 send_session_ack_message (n);
2640 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2641 case S_CONNECT_RECV_ATS:
2642 case S_CONNECT_RECV_BLACKLIST:
2643 case S_CONNECT_RECV_ACK:
2644 GNUNET_STATISTICS_update (GST_stats,
2646 ("# unexpected CONNECT_ACK messages (not ready)"),
2650 /* duplicate CONNECT_ACK, let's answer by duplciate SESSION_ACK just in case */
2651 send_session_ack_message (n);
2653 case S_RECONNECT_ATS:
2654 case S_RECONNECT_BLACKLIST:
2655 /* we didn't expect any CONNECT_ACK, as we are waiting for ATS
2656 to give us a new address... */
2657 GNUNET_STATISTICS_update (GST_stats,
2659 ("# unexpected CONNECT_ACK messages (waiting on ATS)"),
2662 case S_RECONNECT_SENT:
2663 /* new address worked; go back to connected! */
2664 n->state = S_CONNECTED;
2665 send_session_ack_message (n);
2667 case S_CONNECTED_SWITCHING_BLACKLIST:
2668 /* duplicate CONNECT_ACK, let's answer by duplciate SESSION_ACK just in case */
2669 send_session_ack_message (n);
2671 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2672 /* new address worked; adopt it and go back to connected! */
2673 n->state = S_CONNECTED;
2674 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2675 GNUNET_break (GNUNET_NO == n->alternative_address.ats_active);
2676 GNUNET_ATS_address_add(GST_ats,
2677 n->alternative_address.address,
2678 n->alternative_address.session,
2680 set_address (&n->primary_address,
2681 n->alternative_address.address,
2682 n->alternative_address.session,
2683 n->alternative_address.bandwidth_in,
2684 n->alternative_address.bandwidth_out,
2686 free_address (&n->alternative_address);
2687 send_session_ack_message (n);
2690 GNUNET_STATISTICS_update (GST_stats,
2692 ("# unexpected CONNECT_ACK messages (disconnecting)"),
2695 case S_DISCONNECT_FINISHED:
2699 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2707 * A session was terminated. Take note; if needed, try to get
2708 * an alternative address from ATS.
2710 * @param peer identity of the peer where the session died
2711 * @param session session that is gone
2712 * @return GNUNET_YES if this was a session used, GNUNET_NO if
2713 * this session was not in use
2716 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
2717 struct Session *session)
2719 struct NeighbourMapEntry *n;
2720 struct BlackListCheckContext *bcc;
2721 struct BlackListCheckContext *bcc_next;
2723 /* make sure to cancel all ongoing blacklist checks involving 'session' */
2725 while (NULL != (bcc = bcc_next))
2727 bcc_next = bcc->next;
2728 if (bcc->na.session == session)
2730 GST_blacklist_test_cancel (bcc->bc);
2731 GNUNET_HELLO_address_free (bcc->na.address);
2732 GNUNET_CONTAINER_DLL_remove (bc_head,
2738 if (NULL == (n = lookup_neighbour (peer)))
2739 return GNUNET_NO; /* can't affect us */
2740 if (session != n->primary_address.session)
2742 if (session == n->alternative_address.session)
2744 free_address (&n->alternative_address);
2745 if ( (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
2746 (S_CONNECTED_SWITCHING_CONNECT_SENT == n->state) )
2747 n->state = S_CONNECTED;
2751 return GNUNET_NO; /* doesn't affect us further */
2754 n->expect_latency_response = GNUNET_NO;
2757 case S_NOT_CONNECTED:
2759 free_neighbour (n, GNUNET_NO);
2763 free_neighbour (n, GNUNET_NO);
2765 case S_INIT_BLACKLIST:
2766 case S_CONNECT_SENT:
2767 free_address (&n->primary_address);
2768 n->state = S_INIT_ATS;
2769 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2770 // FIXME: need to ask ATS for suggestions again?
2771 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2773 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2774 case S_CONNECT_RECV_ATS:
2775 case S_CONNECT_RECV_BLACKLIST:
2776 case S_CONNECT_RECV_ACK:
2777 /* error on inbound session; free neighbour entirely */
2778 free_address (&n->primary_address);
2779 free_neighbour (n, GNUNET_NO);
2782 free_address (&n->primary_address);
2783 n->state = S_RECONNECT_ATS;
2784 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2785 /* FIXME: is this ATS call needed? */
2786 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2788 case S_RECONNECT_ATS:
2789 /* we don't have an address, how can it go down? */
2792 case S_RECONNECT_BLACKLIST:
2793 case S_RECONNECT_SENT:
2794 n->state = S_RECONNECT_ATS;
2795 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2796 // FIXME: need to ask ATS for suggestions again?
2797 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2799 case S_CONNECTED_SWITCHING_BLACKLIST:
2800 /* primary went down while we were checking secondary against
2801 blacklist, adopt secondary as primary */
2802 free_address (&n->primary_address);
2803 n->primary_address = n->alternative_address;
2804 memset (&n->alternative_address, 0, sizeof (struct NeighbourAddress));
2805 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
2806 n->state = S_RECONNECT_BLACKLIST;
2808 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2809 /* primary went down while we were waiting for CONNECT_ACK on secondary;
2810 secondary as primary */
2811 free_address (&n->primary_address);
2812 n->primary_address = n->alternative_address;
2813 memset (&n->alternative_address, 0, sizeof (struct NeighbourAddress));
2814 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
2815 n->state = S_RECONNECT_SENT;
2818 free_address (&n->primary_address);
2820 case S_DISCONNECT_FINISHED:
2821 /* neighbour was freed and plugins told to terminate session */
2825 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2829 if (GNUNET_SCHEDULER_NO_TASK != n->task)
2830 GNUNET_SCHEDULER_cancel (n->task);
2831 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
2837 * We received a 'SESSION_ACK' message from the other peer.
2838 * If we sent a 'CONNECT_ACK' last, this means we are now
2839 * connected. Otherwise, do nothing.
2841 * @param message possibly a 'struct SessionConnectMessage' (check format)
2842 * @param peer identity of the peer to switch the address for
2843 * @param address address of the other peer, NULL if other peer
2845 * @param session session to use (or NULL)
2846 * @param ats performance data
2847 * @param ats_count number of entries in ats
2850 GST_neighbours_handle_session_ack (const struct GNUNET_MessageHeader *message,
2851 const struct GNUNET_PeerIdentity *peer,
2852 const struct GNUNET_HELLO_Address *address,
2853 struct Session *session,
2854 const struct GNUNET_ATS_Information *ats,
2857 struct NeighbourMapEntry *n;
2859 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2860 "Received SESSION_ACK message from peer `%s'\n",
2862 if (ntohs (message->size) != sizeof (struct GNUNET_MessageHeader))
2864 GNUNET_break_op (0);
2867 if (NULL == (n = lookup_neighbour (peer)))
2869 /* check if we are in a plausible state for having sent
2870 a CONNECT_ACK. If not, return, otherwise break */
2871 if ( ( (S_CONNECT_RECV_ACK != n->state) &&
2872 (S_CONNECT_SENT != n->state) ) ||
2873 (2 != n->send_connect_ack) )
2875 GNUNET_STATISTICS_update (GST_stats,
2876 gettext_noop ("# unexpected SESSION ACK messages"), 1,
2880 n->state = S_CONNECTED;
2881 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2882 GNUNET_STATISTICS_set (GST_stats,
2883 gettext_noop ("# peers connected"),
2884 ++neighbours_connected,
2886 connect_notify_cb (callback_cls, &n->id, ats, ats_count);
2887 GNUNET_ATS_address_add(GST_ats,
2888 n->primary_address.address,
2889 n->primary_address.session,
2891 set_address (&n->primary_address,
2892 n->primary_address.address,
2893 n->primary_address.session,
2894 n->primary_address.bandwidth_in,
2895 n->primary_address.bandwidth_out,
2901 * Test if we're connected to the given peer.
2903 * @param target peer to test
2904 * @return GNUNET_YES if we are connected, GNUNET_NO if not
2907 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
2909 return test_connected (lookup_neighbour (target));
2914 * Change the incoming quota for the given peer.
2916 * @param neighbour identity of peer to change qutoa for
2917 * @param quota new quota
2920 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
2921 struct GNUNET_BANDWIDTH_Value32NBO quota)
2923 struct NeighbourMapEntry *n;
2925 if (NULL == (n = lookup_neighbour (neighbour)))
2927 GNUNET_STATISTICS_update (GST_stats,
2929 ("# SET QUOTA messages ignored (no such peer)"),
2933 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2934 "Setting inbound quota of %u Bps for peer `%s' to all clients\n",
2935 ntohl (quota.value__), GNUNET_i2s (&n->id));
2936 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
2937 if (0 != ntohl (quota.value__))
2939 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
2940 GNUNET_i2s (&n->id), "SET_QUOTA");
2941 if (GNUNET_YES == test_connected (n))
2942 GNUNET_STATISTICS_update (GST_stats,
2943 gettext_noop ("# disconnects due to quota of 0"),
2945 disconnect_neighbour (n);
2950 * We received a disconnect message from the given peer,
2951 * validate and process.
2953 * @param peer sender of the message
2954 * @param msg the disconnect message
2957 GST_neighbours_handle_disconnect_message (const struct GNUNET_PeerIdentity
2959 const struct GNUNET_MessageHeader
2962 struct NeighbourMapEntry *n;
2963 const struct SessionDisconnectMessage *sdm;
2964 struct GNUNET_HashCode hc;
2966 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2967 "Received DISCONNECT message from peer `%s'\n",
2969 if (ntohs (msg->size) != sizeof (struct SessionDisconnectMessage))
2971 // GNUNET_break_op (0);
2972 GNUNET_STATISTICS_update (GST_stats,
2974 ("# disconnect messages ignored (old format)"), 1,
2978 sdm = (const struct SessionDisconnectMessage *) msg;
2979 if (NULL == (n = lookup_neighbour (peer)))
2980 return; /* gone already */
2981 if (GNUNET_TIME_absolute_ntoh (sdm->timestamp).abs_value <= n->connect_ack_timestamp.abs_value)
2983 GNUNET_STATISTICS_update (GST_stats,
2985 ("# disconnect messages ignored (timestamp)"), 1,
2989 GNUNET_CRYPTO_hash (&sdm->public_key,
2990 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2992 if (0 != memcmp (peer, &hc, sizeof (struct GNUNET_PeerIdentity)))
2994 GNUNET_break_op (0);
2997 if (ntohl (sdm->purpose.size) !=
2998 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2999 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
3000 sizeof (struct GNUNET_TIME_AbsoluteNBO))
3002 GNUNET_break_op (0);
3006 GNUNET_CRYPTO_rsa_verify
3007 (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT, &sdm->purpose,
3008 &sdm->signature, &sdm->public_key))
3010 GNUNET_break_op (0);
3013 if (GNUNET_YES == test_connected (n))
3014 GNUNET_STATISTICS_update (GST_stats,
3016 ("# other peer asked to disconnect from us"), 1,
3018 disconnect_neighbour (n);
3023 * Closure for the neighbours_iterate function.
3025 struct IteratorContext
3028 * Function to call on each connected neighbour.
3030 GST_NeighbourIterator cb;
3040 * Call the callback from the closure for each connected neighbour.
3042 * @param cls the 'struct IteratorContext'
3043 * @param key the hash of the public key of the neighbour
3044 * @param value the 'struct NeighbourMapEntry'
3045 * @return GNUNET_OK (continue to iterate)
3048 neighbours_iterate (void *cls, const struct GNUNET_HashCode * key, void *value)
3050 struct IteratorContext *ic = cls;
3051 struct NeighbourMapEntry *n = value;
3053 if (GNUNET_YES == test_connected (n))
3054 ic->cb (ic->cb_cls, &n->id, NULL, 0, n->primary_address.address);
3060 * Iterate over all connected neighbours.
3062 * @param cb function to call
3063 * @param cb_cls closure for cb
3066 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
3068 struct IteratorContext ic;
3070 if (NULL == neighbours)
3071 return; /* can happen during shutdown */
3074 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
3079 * If we have an active connection to the given target, it must be shutdown.
3081 * @param target peer to disconnect from
3084 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
3086 struct NeighbourMapEntry *n;
3088 if (NULL == (n = lookup_neighbour (target)))
3089 return; /* not active */
3090 if (GNUNET_YES == test_connected (n))
3091 GNUNET_STATISTICS_update (GST_stats,
3093 ("# disconnected from peer upon explicit request"), 1,
3095 disconnect_neighbour (n);
3100 * Obtain current latency information for the given neighbour.
3102 * @param peer to get the latency for
3103 * @return observed latency of the address, FOREVER if the
3104 * the connection is not up
3106 struct GNUNET_TIME_Relative
3107 GST_neighbour_get_latency (const struct GNUNET_PeerIdentity *peer)
3109 struct NeighbourMapEntry *n;
3111 n = lookup_neighbour (peer);
3113 return GNUNET_TIME_UNIT_FOREVER_REL;
3117 case S_RECONNECT_SENT:
3118 case S_RECONNECT_ATS:
3120 case S_NOT_CONNECTED:
3121 case S_INIT_BLACKLIST:
3123 case S_CONNECT_RECV_BLACKLIST_INBOUND:
3124 case S_CONNECT_SENT:
3125 case S_CONNECT_RECV_BLACKLIST:
3127 case S_DISCONNECT_FINISHED:
3128 return GNUNET_TIME_UNIT_FOREVER_REL;
3130 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
3134 return GNUNET_TIME_UNIT_FOREVER_REL;
3139 * Obtain current address information for the given neighbour.
3142 * @return address currently used
3144 struct GNUNET_HELLO_Address *
3145 GST_neighbour_get_current_address (const struct GNUNET_PeerIdentity *peer)
3147 struct NeighbourMapEntry *n;
3149 n = lookup_neighbour (peer);
3152 return n->primary_address.address;
3157 * Initialize the neighbours subsystem.
3159 * @param cls closure for callbacks
3160 * @param connect_cb function to call if we connect to a peer
3161 * @param disconnect_cb function to call if we disconnect from a peer
3162 * @param peer_address_cb function to call if we change an active address
3166 GST_neighbours_start (void *cls,
3167 GNUNET_TRANSPORT_NotifyConnect connect_cb,
3168 GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb,
3169 GNUNET_TRANSPORT_PeerIterateCallback peer_address_cb)
3172 connect_notify_cb = connect_cb;
3173 disconnect_notify_cb = disconnect_cb;
3174 address_change_cb = peer_address_cb;
3175 neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE);
3180 * Disconnect from the given neighbour.
3183 * @param key hash of neighbour's public key (not used)
3184 * @param value the 'struct NeighbourMapEntry' of the neighbour
3185 * @return GNUNET_OK (continue to iterate)
3188 disconnect_all_neighbours (void *cls, const struct GNUNET_HashCode * key, void *value)
3190 struct NeighbourMapEntry *n = value;
3192 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3193 "Disconnecting peer `%4s', %s\n",
3194 GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
3195 n->state = S_DISCONNECT_FINISHED;
3196 free_neighbour (n, GNUNET_NO);
3202 * Cleanup the neighbours subsystem.
3205 GST_neighbours_stop ()
3207 if (NULL == neighbours)
3209 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
3210 &disconnect_all_neighbours,
3212 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
3214 callback_cls = NULL;
3215 connect_notify_cb = NULL;
3216 disconnect_notify_cb = NULL;
3217 address_change_cb = NULL;
3221 /* end of file gnunet-service-transport_neighbours.c */