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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;
873 struct GNUNET_HELLO_Address *backup_primary;
875 n->is_active = NULL; /* always free'd by its own continuation! */
877 /* fail messages currently in the queue */
878 while (NULL != (mq = n->messages_head))
880 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
881 if (NULL != mq->cont)
882 mq->cont (mq->cont_cls, GNUNET_SYSERR);
885 /* It is too late to send other peer disconnect notifications, but at
886 least internally we need to get clean... */
887 if (GNUNET_YES == test_connected (n))
889 GNUNET_STATISTICS_set (GST_stats,
890 gettext_noop ("# peers connected"),
891 --neighbours_connected,
893 disconnect_notify_cb (callback_cls, &n->id);
896 n->state = S_DISCONNECT_FINISHED;
898 if (NULL != n->primary_address.address)
899 backup_primary = GNUNET_HELLO_address_copy(n->primary_address.address);
901 backup_primary = NULL;
903 /* free addresses and mark as unused */
904 free_address (&n->primary_address);
905 free_address (&n->alternative_address);
907 /* FIXME-PLUGIN-API: This does not seem to guarantee that all
908 transport sessions eventually get killed due to inactivity; they
909 MUST have their own timeout logic (but at least TCP doesn't have
910 one yet). Are we sure that EVERY 'session' of a plugin is
911 actually cleaned up this way!? Note that if we are switching
912 between two TCP sessions to the same peer, the existing plugin
913 API gives us not even the means to selectively kill only one of
914 them! Killing all sessions like this seems to be very, very
917 /* cut transport-level connection */
918 if ((GNUNET_NO == keep_sessions) &&
919 (NULL != backup_primary) &&
920 (NULL != (papi = GST_plugins_find (backup_primary->transport_name))))
921 papi->disconnect (papi->cls, &n->id);
923 GNUNET_free_non_null (backup_primary);
925 GNUNET_assert (GNUNET_YES ==
926 GNUNET_CONTAINER_multihashmap_remove (neighbours,
927 &n->id.hashPubKey, n));
929 // FIXME-ATS-API: we might want to be more specific about
930 // which states we do this from in the future (ATS should
931 // have given us a 'suggest_address' handle, and if we have
932 // such a handle, we should cancel the operation here!
933 GNUNET_ATS_suggest_address_cancel (GST_ats, &n->id);
935 if (GNUNET_SCHEDULER_NO_TASK != n->task)
937 GNUNET_SCHEDULER_cancel (n->task);
938 n->task = GNUNET_SCHEDULER_NO_TASK;
940 /* free rest of memory */
946 * Transmit a message using the current session of the given
949 * @param n entry for the recipient
950 * @param msgbuf buffer to transmit
951 * @param msgbuf_size number of bytes in buffer
952 * @param priority transmission priority
953 * @param timeout transmission timeout
954 * @param cont continuation to call when finished (can be NULL)
955 * @param cont_cls closure for cont
958 send_with_session (struct NeighbourMapEntry *n,
959 const char *msgbuf, size_t msgbuf_size,
961 struct GNUNET_TIME_Relative timeout,
962 GNUNET_TRANSPORT_TransmitContinuation cont,
965 struct GNUNET_TRANSPORT_PluginFunctions *papi;
967 GNUNET_assert (n->primary_address.session != NULL);
968 if ( ( (NULL == (papi = GST_plugins_find (n->primary_address.address->transport_name))) ||
969 (-1 == papi->send (papi->cls,
970 n->primary_address.session,
976 cont (cont_cls, &n->id, GNUNET_SYSERR);
977 GNUNET_break (NULL != papi);
982 * Master task run for every neighbour. Performs all of the time-related
983 * activities (keep alive, send next message, disconnect if idle, finish
984 * clean up after disconnect).
986 * @param cls the 'struct NeighbourMapEntry' for which we are running
987 * @param tc scheduler context (unused)
990 master_task (void *cls,
991 const struct GNUNET_SCHEDULER_TaskContext *tc);
995 * Function called when the 'DISCONNECT' message has been sent by the
996 * plugin. Frees the neighbour --- if the entry still exists.
999 * @param target identity of the neighbour that was disconnected
1000 * @param result GNUNET_OK if the disconnect got out successfully
1003 send_disconnect_cont (void *cls, const struct GNUNET_PeerIdentity *target,
1006 struct NeighbourMapEntry *n;
1008 n = lookup_neighbour (target);
1010 return; /* already gone */
1011 if (S_DISCONNECT != n->state)
1012 return; /* have created a fresh entry since */
1013 n->state = S_DISCONNECT;
1014 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1015 GNUNET_SCHEDULER_cancel (n->task);
1016 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1021 * Transmit a DISCONNECT message to the other peer.
1023 * @param n neighbour to send DISCONNECT message.
1026 send_disconnect (struct NeighbourMapEntry *n)
1028 struct SessionDisconnectMessage disconnect_msg;
1030 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1031 "Sending DISCONNECT message to peer `%4s'\n",
1032 GNUNET_i2s (&n->id));
1033 disconnect_msg.header.size = htons (sizeof (struct SessionDisconnectMessage));
1034 disconnect_msg.header.type =
1035 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1036 disconnect_msg.reserved = htonl (0);
1037 disconnect_msg.purpose.size =
1038 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
1039 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
1040 sizeof (struct GNUNET_TIME_AbsoluteNBO));
1041 disconnect_msg.purpose.purpose =
1042 htonl (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1043 disconnect_msg.timestamp =
1044 GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1045 disconnect_msg.public_key = GST_my_public_key;
1046 GNUNET_assert (GNUNET_OK ==
1047 GNUNET_CRYPTO_rsa_sign (GST_my_private_key,
1048 &disconnect_msg.purpose,
1049 &disconnect_msg.signature));
1051 send_with_session (n,
1052 (const char *) &disconnect_msg, sizeof (disconnect_msg),
1053 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
1054 &send_disconnect_cont, NULL);
1055 GNUNET_STATISTICS_update (GST_stats,
1057 ("# DISCONNECT messages sent"), 1,
1063 * Disconnect from the given neighbour, clean up the record.
1065 * @param n neighbour to disconnect from
1068 disconnect_neighbour (struct NeighbourMapEntry *n)
1070 /* depending on state, notify neighbour and/or upper layers of this peer
1074 case S_NOT_CONNECTED:
1076 case S_INIT_BLACKLIST:
1077 /* other peer is completely unaware of us, no need to send DISCONNECT */
1078 n->state = S_DISCONNECT_FINISHED;
1079 free_neighbour (n, GNUNET_NO);
1081 case S_CONNECT_SENT:
1082 send_disconnect (n);
1083 n->state = S_DISCONNECT;
1085 case S_CONNECT_RECV_BLACKLIST_INBOUND:
1086 case S_CONNECT_RECV_ATS:
1087 case S_CONNECT_RECV_BLACKLIST:
1088 /* we never ACK'ed the other peer's request, no need to send DISCONNECT */
1089 n->state = S_DISCONNECT_FINISHED;
1090 free_neighbour (n, GNUNET_NO);
1092 case S_CONNECT_RECV_ACK:
1093 /* we DID ACK the other peer's request, must send DISCONNECT */
1094 send_disconnect (n);
1095 n->state = S_DISCONNECT;
1098 case S_RECONNECT_BLACKLIST:
1099 case S_RECONNECT_SENT:
1100 case S_CONNECTED_SWITCHING_BLACKLIST:
1101 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1102 /* we are currently connected, need to send disconnect and do
1103 internal notifications and update statistics */
1104 send_disconnect (n);
1105 GNUNET_STATISTICS_set (GST_stats,
1106 gettext_noop ("# peers connected"),
1107 --neighbours_connected,
1109 disconnect_notify_cb (callback_cls, &n->id);
1110 n->state = S_DISCONNECT;
1112 case S_RECONNECT_ATS:
1113 /* ATS address request timeout, disconnect without sending disconnect message */
1114 GNUNET_STATISTICS_set (GST_stats,
1115 gettext_noop ("# peers connected"),
1116 --neighbours_connected,
1118 disconnect_notify_cb (callback_cls, &n->id);
1119 n->state = S_DISCONNECT;
1122 /* already disconnected, ignore */
1124 case S_DISCONNECT_FINISHED:
1125 /* already cleaned up, how did we get here!? */
1129 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1133 /* schedule timeout to clean up */
1134 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1135 GNUNET_SCHEDULER_cancel (n->task);
1136 n->task = GNUNET_SCHEDULER_add_delayed (DISCONNECT_SENT_TIMEOUT,
1142 * We're done with our transmission attempt, continue processing.
1144 * @param cls the 'struct MessageQueue' of the message
1145 * @param receiver intended receiver
1146 * @param success whether it worked or not
1149 transmit_send_continuation (void *cls,
1150 const struct GNUNET_PeerIdentity *receiver,
1153 struct MessageQueue *mq = cls;
1154 struct NeighbourMapEntry *n;
1156 if (NULL == (n = lookup_neighbour (receiver)))
1159 return; /* disconnect or other error while transmitting, can happen */
1161 if (n->is_active == mq)
1163 /* this is still "our" neighbour, remove us from its queue
1164 and allow it to send the next message now */
1165 n->is_active = NULL;
1166 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1167 GNUNET_SCHEDULER_cancel (n->task);
1168 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1170 GNUNET_assert (bytes_in_send_queue >= mq->message_buf_size);
1171 bytes_in_send_queue -= mq->message_buf_size;
1172 GNUNET_STATISTICS_set (GST_stats,
1174 ("# bytes in message queue for other peers"),
1175 bytes_in_send_queue, GNUNET_NO);
1176 if (GNUNET_OK == success)
1177 GNUNET_STATISTICS_update (GST_stats,
1179 ("# messages transmitted to other peers"),
1182 GNUNET_STATISTICS_update (GST_stats,
1184 ("# transmission failures for messages to other peers"),
1186 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1187 "Sending message to `%s' of type %u was a %s\n",
1188 GNUNET_i2s (receiver),
1189 ntohs (((struct GNUNET_MessageHeader *) mq->message_buf)->type),
1190 (success == GNUNET_OK) ? "success" : "FAILURE");
1191 if (NULL != mq->cont)
1192 mq->cont (mq->cont_cls, success);
1198 * Check the message list for the given neighbour and if we can
1199 * send a message, do so. This function should only be called
1200 * if the connection is at least generally ready for transmission.
1201 * While we will only send one message at a time, no bandwidth
1202 * quota management is performed here. If a message was given to
1203 * the plugin, the continuation will automatically re-schedule
1204 * the 'master' task once the next message might be transmitted.
1206 * @param n target peer for which to transmit
1209 try_transmission_to_peer (struct NeighbourMapEntry *n)
1211 struct MessageQueue *mq;
1212 struct GNUNET_TIME_Relative timeout;
1214 if (NULL == n->primary_address.address)
1216 /* no address, why are we here? */
1220 if ((0 == n->primary_address.address->address_length) &&
1221 (NULL == n->primary_address.session))
1223 /* no address, why are we here? */
1227 if (NULL != n->is_active)
1229 /* transmission already pending */
1233 /* timeout messages from the queue that are past their due date */
1234 while (NULL != (mq = n->messages_head))
1236 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1237 if (timeout.rel_value > 0)
1239 GNUNET_STATISTICS_update (GST_stats,
1241 ("# messages timed out while in transport queue"),
1243 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
1245 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR); /* timeout */
1248 return; /* no more messages */
1249 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
1251 send_with_session (n,
1252 mq->message_buf, mq->message_buf_size,
1253 0 /* priority */, timeout,
1254 &transmit_send_continuation, mq);
1259 * Send keepalive message to the neighbour. Must only be called
1260 * if we are on 'connected' state or while trying to switch addresses.
1261 * Will internally determine if a keepalive is truly needed (so can
1262 * always be called).
1264 * @param n neighbour that went idle and needs a keepalive
1267 send_keepalive (struct NeighbourMapEntry *n)
1269 struct GNUNET_MessageHeader m;
1271 GNUNET_assert ((S_CONNECTED == n->state) ||
1272 (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
1273 (S_CONNECTED_SWITCHING_CONNECT_SENT));
1274 if (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time).rel_value > 0)
1275 return; /* no keepalive needed at this time */
1276 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1277 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE);
1278 send_with_session (n,
1279 (const void *) &m, sizeof (m),
1280 UINT32_MAX /* priority */,
1281 KEEPALIVE_FREQUENCY,
1283 GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# keepalives sent"), 1,
1285 n->expect_latency_response = GNUNET_YES;
1286 n->last_keep_alive_time = GNUNET_TIME_absolute_get ();
1287 n->keep_alive_time = GNUNET_TIME_relative_to_absolute (KEEPALIVE_FREQUENCY);
1292 * Keep the connection to the given neighbour alive longer,
1293 * we received a KEEPALIVE (or equivalent); send a response.
1295 * @param neighbour neighbour to keep alive (by sending keep alive response)
1298 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
1300 struct NeighbourMapEntry *n;
1301 struct GNUNET_MessageHeader m;
1303 if (NULL == (n = lookup_neighbour (neighbour)))
1305 GNUNET_STATISTICS_update (GST_stats,
1307 ("# KEEPALIVE messages discarded (peer unknown)"),
1311 if (NULL == n->primary_address.session)
1313 GNUNET_STATISTICS_update (GST_stats,
1315 ("# KEEPALIVE messages discarded (no session)"),
1319 /* send reply to allow neighbour to measure latency */
1320 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1321 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE_RESPONSE);
1322 send_with_session(n,
1323 (const void *) &m, sizeof (m),
1324 UINT32_MAX /* priority */,
1325 KEEPALIVE_FREQUENCY,
1331 * We received a KEEP_ALIVE_RESPONSE message and use this to calculate
1332 * latency to this peer. Pass the updated information (existing ats
1333 * plus calculated latency) to ATS.
1335 * @param neighbour neighbour to keep alive
1336 * @param ats performance data
1337 * @param ats_count number of entries in ats
1340 GST_neighbours_keepalive_response (const struct GNUNET_PeerIdentity *neighbour,
1341 const struct GNUNET_ATS_Information *ats,
1344 struct NeighbourMapEntry *n;
1346 struct GNUNET_ATS_Information ats_new[ats_count + 1];
1348 if (NULL == (n = lookup_neighbour (neighbour)))
1350 GNUNET_STATISTICS_update (GST_stats,
1352 ("# KEEPALIVE_RESPONSE messages discarded (not connected)"),
1356 if ( (S_CONNECTED != n->state) ||
1357 (GNUNET_YES != n->expect_latency_response) )
1359 GNUNET_STATISTICS_update (GST_stats,
1361 ("# KEEPALIVE_RESPONSE messages discarded (not expected)"),
1365 n->expect_latency_response = GNUNET_NO;
1366 n->latency = GNUNET_TIME_absolute_get_duration (n->last_keep_alive_time);
1367 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1368 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1369 "Latency for peer `%s' is %llu ms\n",
1370 GNUNET_i2s (&n->id), n->latency.rel_value);
1371 memcpy (ats_new, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1372 /* append latency */
1373 ats_new[ats_count].type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
1374 if (n->latency.rel_value > UINT32_MAX)
1375 latency = UINT32_MAX;
1377 latency = n->latency.rel_value;
1378 ats_new[ats_count].value = htonl (latency);
1379 GNUNET_ATS_address_update (GST_ats,
1380 n->primary_address.address,
1381 n->primary_address.session, ats_new,
1387 * We have received a message from the given sender. How long should
1388 * we delay before receiving more? (Also used to keep the peer marked
1391 * @param sender sender of the message
1392 * @param size size of the message
1393 * @param do_forward set to GNUNET_YES if the message should be forwarded to clients
1394 * GNUNET_NO if the neighbour is not connected or violates the quota,
1395 * GNUNET_SYSERR if the connection is not fully up yet
1396 * @return how long to wait before reading more from this sender
1398 struct GNUNET_TIME_Relative
1399 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
1400 *sender, ssize_t size, int *do_forward)
1402 struct NeighbourMapEntry *n;
1403 struct GNUNET_TIME_Relative ret;
1405 if (NULL == neighbours)
1407 *do_forward = GNUNET_NO;
1408 return GNUNET_TIME_UNIT_FOREVER_REL; /* This can happen during shutdown */
1410 if (NULL == (n = lookup_neighbour (sender)))
1412 GST_neighbours_try_connect (sender);
1413 if (NULL == (n = lookup_neighbour (sender)))
1415 GNUNET_STATISTICS_update (GST_stats,
1417 ("# messages discarded due to lack of neighbour record"),
1419 *do_forward = GNUNET_NO;
1420 return GNUNET_TIME_UNIT_ZERO;
1423 if (! test_connected (n))
1425 *do_forward = GNUNET_SYSERR;
1426 return GNUNET_TIME_UNIT_ZERO;
1428 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
1430 n->quota_violation_count++;
1431 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1432 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
1433 n->in_tracker.available_bytes_per_s__,
1434 n->quota_violation_count);
1435 /* Discount 32k per violation */
1436 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
1440 if (n->quota_violation_count > 0)
1442 /* try to add 32k back */
1443 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
1444 n->quota_violation_count--;
1447 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
1449 GNUNET_STATISTICS_update (GST_stats,
1451 ("# bandwidth quota violations by other peers"),
1453 *do_forward = GNUNET_NO;
1454 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
1456 *do_forward = GNUNET_YES;
1457 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 32 * 1024);
1458 if (ret.rel_value > 0)
1460 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1461 "Throttling read (%llu bytes excess at %u b/s), waiting %llu ms before reading more.\n",
1462 (unsigned long long) n->in_tracker.
1463 consumption_since_last_update__,
1464 (unsigned int) n->in_tracker.available_bytes_per_s__,
1465 (unsigned long long) ret.rel_value);
1466 GNUNET_STATISTICS_update (GST_stats,
1467 gettext_noop ("# ms throttling suggested"),
1468 (int64_t) ret.rel_value, GNUNET_NO);
1475 * Transmit a message to the given target using the active connection.
1477 * @param target destination
1478 * @param msg message to send
1479 * @param msg_size number of bytes in msg
1480 * @param timeout when to fail with timeout
1481 * @param cont function to call when done
1482 * @param cont_cls closure for 'cont'
1485 GST_neighbours_send (const struct GNUNET_PeerIdentity *target, const void *msg,
1486 size_t msg_size, struct GNUNET_TIME_Relative timeout,
1487 GST_NeighbourSendContinuation cont, void *cont_cls)
1489 struct NeighbourMapEntry *n;
1490 struct MessageQueue *mq;
1492 /* All ove these cases should never happen; they are all API violations.
1493 But we check anyway, just to be sure. */
1494 if (NULL == (n = lookup_neighbour (target)))
1498 cont (cont_cls, GNUNET_SYSERR);
1501 if (GNUNET_YES != test_connected (n))
1505 cont (cont_cls, GNUNET_SYSERR);
1508 bytes_in_send_queue += msg_size;
1509 GNUNET_STATISTICS_set (GST_stats,
1511 ("# bytes in message queue for other peers"),
1512 bytes_in_send_queue, GNUNET_NO);
1513 mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
1515 mq->cont_cls = cont_cls;
1516 memcpy (&mq[1], msg, msg_size);
1517 mq->message_buf = (const char *) &mq[1];
1518 mq->message_buf_size = msg_size;
1519 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1520 GNUNET_CONTAINER_DLL_insert_tail (n->messages_head, n->messages_tail, mq);
1521 if ( (NULL != n->is_active) ||
1522 ( (NULL == n->primary_address.session) && (NULL == n->primary_address.address)) )
1524 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1525 GNUNET_SCHEDULER_cancel (n->task);
1526 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1531 * Send a SESSION_CONNECT message via the given address.
1533 * @param na address to use
1536 send_session_connect (struct NeighbourAddress *na)
1538 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1539 struct SessionConnectMessage connect_msg;
1541 if (NULL == (papi = GST_plugins_find (na->address->transport_name)))
1546 if (NULL == na->session)
1547 na->session = papi->get_session (papi->cls, na->address);
1548 if (NULL == na->session)
1553 na->connect_timestamp = GNUNET_TIME_absolute_get ();
1554 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1555 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
1556 connect_msg.reserved = htonl (0);
1557 connect_msg.timestamp = GNUNET_TIME_absolute_hton (na->connect_timestamp);
1558 (void) papi->send (papi->cls,
1560 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1562 GNUNET_TIME_UNIT_FOREVER_REL,
1568 * Send a SESSION_CONNECT_ACK message via the given address.
1570 * @param address address to use
1571 * @param session session to use
1572 * @param timestamp timestamp to use for the ACK message
1575 send_session_connect_ack_message (const struct GNUNET_HELLO_Address *address,
1576 struct Session *session,
1577 struct GNUNET_TIME_Absolute timestamp)
1579 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1580 struct SessionConnectMessage connect_msg;
1582 if (NULL == (papi = GST_plugins_find (address->transport_name)))
1587 if (NULL == session)
1588 session = papi->get_session (papi->cls, address);
1589 if (NULL == session)
1594 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1595 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT_ACK);
1596 connect_msg.reserved = htonl (0);
1597 connect_msg.timestamp = GNUNET_TIME_absolute_hton (timestamp);
1598 (void) papi->send (papi->cls,
1600 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1602 GNUNET_TIME_UNIT_FOREVER_REL,
1608 * Create a fresh entry in the neighbour map for the given peer
1610 * @param peer peer to create an entry for
1611 * @return new neighbour map entry
1613 static struct NeighbourMapEntry *
1614 setup_neighbour (const struct GNUNET_PeerIdentity *peer)
1616 struct NeighbourMapEntry *n;
1618 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1619 "Creating new neighbour entry for `%s'\n",
1621 n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
1623 n->state = S_NOT_CONNECTED;
1624 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
1625 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
1626 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
1627 MAX_BANDWIDTH_CARRY_S);
1628 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1629 GNUNET_assert (GNUNET_OK ==
1630 GNUNET_CONTAINER_multihashmap_put (neighbours,
1631 &n->id.hashPubKey, n,
1632 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1638 * Check if the two given addresses are the same.
1639 * Actually only checks if the sessions are non-NULL
1640 * (which they should be) and then if they are identical;
1641 * the actual addresses don't matter if the session
1642 * pointers match anyway, and we must have session pointers
1645 * @param a1 first address to compare
1646 * @param a2 other address to compare
1647 * @return GNUNET_NO if the addresses do not match, GNUNET_YES if they do match
1650 address_matches (const struct NeighbourAddress *a1,
1651 const struct NeighbourAddress *a2)
1653 if ( (NULL == a1->session) ||
1654 (NULL == a2->session) )
1659 return (a1->session == a2->session) ? GNUNET_YES : GNUNET_NO;
1664 * Try to create a connection to the given target (eventually).
1666 * @param target peer to try to connect to
1669 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
1671 struct NeighbourMapEntry *n;
1673 if (NULL == neighbours)
1674 return; /* during shutdown, do nothing */
1675 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1676 "Asked to connect to peer `%s'\n",
1677 GNUNET_i2s (target));
1679 memcmp (target, &GST_my_identity, sizeof (struct GNUNET_PeerIdentity)))
1681 /* refuse to connect to myself */
1682 /* FIXME: can this happen? Is this not an API violation? */
1683 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1684 "Refusing to try to connect to myself.\n");
1687 n = lookup_neighbour (target);
1692 case S_NOT_CONNECTED:
1693 /* this should not be possible */
1695 free_neighbour (n, GNUNET_NO);
1698 case S_INIT_BLACKLIST:
1699 case S_CONNECT_SENT:
1700 case S_CONNECT_RECV_BLACKLIST_INBOUND:
1701 case S_CONNECT_RECV_ATS:
1702 case S_CONNECT_RECV_BLACKLIST:
1703 case S_CONNECT_RECV_ACK:
1704 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1705 "Ignoring request to try to connect to `%s', already trying!\n",
1706 GNUNET_i2s (target));
1707 return; /* already trying */
1709 case S_RECONNECT_ATS:
1710 case S_RECONNECT_BLACKLIST:
1711 case S_RECONNECT_SENT:
1712 case S_CONNECTED_SWITCHING_BLACKLIST:
1713 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1714 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1715 "Ignoring request to try to connect, already connected to `%s'!\n",
1716 GNUNET_i2s (target));
1717 return; /* already connected */
1719 /* get rid of remains, ready to re-try immediately */
1720 free_neighbour (n, GNUNET_NO);
1722 case S_DISCONNECT_FINISHED:
1723 /* should not be possible */
1726 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1728 free_neighbour (n, GNUNET_NO);
1732 n = setup_neighbour (target);
1733 n->state = S_INIT_ATS;
1734 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1736 GNUNET_ATS_reset_backoff (GST_ats, target);
1737 GNUNET_ATS_suggest_address (GST_ats, target);
1742 * Function called with the result of a blacklist check.
1744 * @param cls closure with the 'struct BlackListCheckContext'
1745 * @param peer peer this check affects
1746 * @param result GNUNET_OK if the address is allowed
1749 handle_test_blacklist_cont (void *cls,
1750 const struct GNUNET_PeerIdentity *peer,
1753 struct BlackListCheckContext *bcc = cls;
1754 struct NeighbourMapEntry *n;
1757 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1758 "Connection to new address of peer `%s' based on blacklist is `%s'\n",
1760 (GNUNET_OK == result) ? "allowed" : "FORBIDDEN");
1761 if (NULL == (n = lookup_neighbour (peer)))
1762 goto cleanup; /* nobody left to care about new address */
1765 case S_NOT_CONNECTED:
1766 /* this should not be possible */
1768 free_neighbour (n, GNUNET_NO);
1771 /* still waiting on ATS suggestion */
1773 case S_INIT_BLACKLIST:
1774 /* check if the address the blacklist was fine with matches
1775 ATS suggestion, if so, we can move on! */
1776 if ( (GNUNET_OK == result) &&
1777 (1 == n->send_connect_ack) )
1779 n->send_connect_ack = 2;
1780 send_session_connect_ack_message (bcc->na.address,
1782 n->connect_ack_timestamp);
1784 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1785 break; /* result for an address we currently don't care about */
1786 if (GNUNET_OK == result)
1788 n->timeout = GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT);
1789 n->state = S_CONNECT_SENT;
1790 send_session_connect (&n->primary_address);
1794 // FIXME: should also possibly destroy session with plugin!?
1795 GNUNET_ATS_address_destroyed (GST_ats,
1798 free_address (&n->primary_address);
1799 n->state = S_INIT_ATS;
1800 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1801 // FIXME: do we need to ask ATS again for suggestions?
1802 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1805 case S_CONNECT_SENT:
1806 /* waiting on CONNECT_ACK, send ACK if one is pending */
1807 if ( (GNUNET_OK == result) &&
1808 (1 == n->send_connect_ack) )
1810 n->send_connect_ack = 2;
1811 send_session_connect_ack_message (n->primary_address.address,
1812 n->primary_address.session,
1813 n->connect_ack_timestamp);
1816 case S_CONNECT_RECV_BLACKLIST_INBOUND:
1817 if (GNUNET_OK == result)
1819 /* valid new address, let ATS know! */
1820 GNUNET_ATS_address_add (GST_ats,
1823 bcc->ats, bcc->ats_count);
1825 n->state = S_CONNECT_RECV_ATS;
1826 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1827 GNUNET_ATS_reset_backoff (GST_ats, peer);
1828 GNUNET_ATS_suggest_address (GST_ats, peer);
1830 case S_CONNECT_RECV_ATS:
1831 /* still waiting on ATS suggestion, don't care about blacklist */
1833 case S_CONNECT_RECV_BLACKLIST:
1834 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1835 break; /* result for an address we currently don't care about */
1836 if (GNUNET_OK == result)
1838 n->timeout = GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT);
1839 n->state = S_CONNECT_RECV_ACK;
1840 send_session_connect_ack_message (bcc->na.address,
1842 n->connect_ack_timestamp);
1843 if (1 == n->send_connect_ack)
1844 n->send_connect_ack = 2;
1848 // FIXME: should also possibly destroy session with plugin!?
1849 GNUNET_ATS_address_destroyed (GST_ats,
1852 free_address (&n->primary_address);
1853 n->state = S_INIT_ATS;
1854 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1855 // FIXME: do we need to ask ATS again for suggestions?
1856 GNUNET_ATS_reset_backoff (GST_ats, peer);
1857 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1860 case S_CONNECT_RECV_ACK:
1861 /* waiting on SESSION_ACK, send ACK if one is pending */
1862 if ( (GNUNET_OK == result) &&
1863 (1 == n->send_connect_ack) )
1865 n->send_connect_ack = 2;
1866 send_session_connect_ack_message (n->primary_address.address,
1867 n->primary_address.session,
1868 n->connect_ack_timestamp);
1872 /* already connected, don't care about blacklist */
1874 case S_RECONNECT_ATS:
1875 /* still waiting on ATS suggestion, don't care about blacklist */
1877 case S_RECONNECT_BLACKLIST:
1878 if ( (GNUNET_OK == result) &&
1879 (1 == n->send_connect_ack) )
1881 n->send_connect_ack = 2;
1882 send_session_connect_ack_message (bcc->na.address,
1884 n->connect_ack_timestamp);
1886 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1887 break; /* result for an address we currently don't care about */
1888 if (GNUNET_OK == result)
1890 send_session_connect (&n->primary_address);
1891 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
1892 n->state = S_RECONNECT_SENT;
1896 GNUNET_ATS_address_destroyed (GST_ats,
1899 n->state = S_RECONNECT_ATS;
1900 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1901 // FIXME: do we need to ask ATS again for suggestions?
1902 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1905 case S_RECONNECT_SENT:
1906 /* waiting on CONNECT_ACK, don't care about blacklist */
1907 if ( (GNUNET_OK == result) &&
1908 (1 == n->send_connect_ack) )
1910 n->send_connect_ack = 2;
1911 send_session_connect_ack_message (n->primary_address.address,
1912 n->primary_address.session,
1913 n->connect_ack_timestamp);
1916 case S_CONNECTED_SWITCHING_BLACKLIST:
1917 if (GNUNET_YES != address_matches (&bcc->na, &n->alternative_address))
1918 break; /* result for an address we currently don't care about */
1919 if (GNUNET_OK == result)
1921 send_session_connect (&n->alternative_address);
1922 n->state = S_CONNECTED_SWITCHING_CONNECT_SENT;
1926 GNUNET_ATS_address_destroyed (GST_ats,
1929 free_address (&n->alternative_address);
1930 n->state = S_CONNECTED;
1933 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1934 /* waiting on CONNECT_ACK, don't care about blacklist */
1935 if ( (GNUNET_OK == result) &&
1936 (1 == n->send_connect_ack) )
1938 n->send_connect_ack = 2;
1939 send_session_connect_ack_message (n->primary_address.address,
1940 n->primary_address.session,
1941 n->connect_ack_timestamp);
1945 /* Nothing to do here, ATS will already do what can be done */
1947 case S_DISCONNECT_FINISHED:
1948 /* should not be possible */
1952 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1954 free_neighbour (n, GNUNET_NO);
1958 GNUNET_HELLO_address_free (bcc->na.address);
1959 GNUNET_CONTAINER_DLL_remove (bc_head,
1967 * We want to know if connecting to a particular peer via
1968 * a particular address is allowed. Check it!
1970 * @param peer identity of the peer to switch the address for
1971 * @param ts time at which the check was initiated
1972 * @param address address of the other peer, NULL if other peer
1974 * @param session session to use (or NULL)
1975 * @param ats performance data
1976 * @param ats_count number of entries in ats (excluding 0-termination)
1979 check_blacklist (const struct GNUNET_PeerIdentity *peer,
1980 struct GNUNET_TIME_Absolute ts,
1981 const struct GNUNET_HELLO_Address *address,
1982 struct Session *session,
1983 const struct GNUNET_ATS_Information *ats,
1986 struct BlackListCheckContext *bcc;
1987 struct GST_BlacklistCheck *bc;
1990 GNUNET_malloc (sizeof (struct BlackListCheckContext) +
1991 sizeof (struct GNUNET_ATS_Information) * ats_count);
1992 bcc->ats_count = ats_count;
1993 bcc->na.address = GNUNET_HELLO_address_copy (address);
1994 bcc->na.session = session;
1995 bcc->na.connect_timestamp = ts;
1996 bcc->ats = (struct GNUNET_ATS_Information *) &bcc[1];
1997 memcpy (bcc->ats, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1998 GNUNET_CONTAINER_DLL_insert (bc_head,
2001 if (NULL != (bc = GST_blacklist_test_allowed (peer,
2002 address->transport_name,
2003 &handle_test_blacklist_cont, bcc)))
2005 /* if NULL == bc, 'cont' was already called and 'bcc' already free'd, so
2006 we must only store 'bc' if 'bc' is non-NULL... */
2011 * We received a 'SESSION_CONNECT' message from the other peer.
2012 * Consider switching to it.
2014 * @param message possibly a 'struct SessionConnectMessage' (check format)
2015 * @param peer identity of the peer to switch the address for
2016 * @param address address of the other peer, NULL if other peer
2018 * @param session session to use (or NULL)
2019 * @param ats performance data
2020 * @param ats_count number of entries in ats (excluding 0-termination)
2023 GST_neighbours_handle_connect (const struct GNUNET_MessageHeader *message,
2024 const struct GNUNET_PeerIdentity *peer,
2025 const struct GNUNET_HELLO_Address *address,
2026 struct Session *session,
2027 const struct GNUNET_ATS_Information *ats,
2030 const struct SessionConnectMessage *scm;
2031 struct NeighbourMapEntry *n;
2032 struct GNUNET_TIME_Absolute ts;
2034 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2035 "Received CONNECT message from peer `%s'\n",
2038 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2040 GNUNET_break_op (0);
2043 if (NULL == neighbours)
2044 return; /* we're shutting down */
2045 scm = (const struct SessionConnectMessage *) message;
2046 GNUNET_break_op (0 == ntohl (scm->reserved));
2047 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2048 n = lookup_neighbour (peer);
2050 n = setup_neighbour (peer);
2051 n->send_connect_ack = 1;
2052 n->connect_ack_timestamp = ts;
2056 case S_NOT_CONNECTED:
2057 n->state = S_CONNECT_RECV_BLACKLIST_INBOUND;
2058 /* Do a blacklist check for the new address */
2059 check_blacklist (peer, ts, address, session, ats, ats_count);
2062 /* CONNECT message takes priority over us asking ATS for address */
2063 n->state = S_CONNECT_RECV_BLACKLIST_INBOUND;
2065 case S_INIT_BLACKLIST:
2066 case S_CONNECT_SENT:
2067 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2068 case S_CONNECT_RECV_ATS:
2069 case S_CONNECT_RECV_BLACKLIST:
2070 case S_CONNECT_RECV_ACK:
2071 /* It can never hurt to have an alternative address in the above cases,
2072 see if it is allowed */
2073 check_blacklist (peer, ts, address, session, ats, ats_count);
2076 /* we are already connected and can thus send the ACK immediately;
2077 still, it can never hurt to have an alternative address, so also
2078 tell ATS about it */
2079 GNUNET_assert (NULL != n->primary_address.address);
2080 GNUNET_assert (NULL != n->primary_address.session);
2081 n->send_connect_ack = 0;
2082 send_session_connect_ack_message (n->primary_address.address,
2083 n->primary_address.session, ts);
2084 check_blacklist (peer, ts, address, session, ats, ats_count);
2086 case S_RECONNECT_ATS:
2087 case S_RECONNECT_BLACKLIST:
2088 case S_RECONNECT_SENT:
2089 /* It can never hurt to have an alternative address in the above cases,
2090 see if it is allowed */
2091 check_blacklist (peer, ts, address, session, ats, ats_count);
2093 case S_CONNECTED_SWITCHING_BLACKLIST:
2094 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2095 /* we are already connected and can thus send the ACK immediately;
2096 still, it can never hurt to have an alternative address, so also
2097 tell ATS about it */
2098 GNUNET_assert (NULL != n->primary_address.address);
2099 GNUNET_assert (NULL != n->primary_address.session);
2100 n->send_connect_ack = 0;
2101 send_session_connect_ack_message (n->primary_address.address,
2102 n->primary_address.session, ts);
2103 check_blacklist (peer, ts, address, session, ats, ats_count);
2106 /* get rid of remains without terminating sessions, ready to re-try */
2107 free_neighbour (n, GNUNET_YES);
2108 n = setup_neighbour (peer);
2109 n->state = S_CONNECT_RECV_ATS;
2110 GNUNET_ATS_reset_backoff (GST_ats, peer);
2111 GNUNET_ATS_suggest_address (GST_ats, peer);
2113 case S_DISCONNECT_FINISHED:
2114 /* should not be possible */
2118 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2120 free_neighbour (n, GNUNET_NO);
2127 * For an existing neighbour record, set the active connection to
2128 * use the given address.
2130 * @param peer identity of the peer to switch the address for
2131 * @param address address of the other peer, NULL if other peer
2133 * @param session session to use (or NULL)
2134 * @param ats performance data
2135 * @param ats_count number of entries in ats
2136 * @param bandwidth_in inbound quota to be used when connection is up
2137 * @param bandwidth_out outbound quota to be used when connection is up
2140 GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
2141 const struct GNUNET_HELLO_Address *address,
2142 struct Session *session,
2143 const struct GNUNET_ATS_Information *ats,
2145 struct GNUNET_BANDWIDTH_Value32NBO
2147 struct GNUNET_BANDWIDTH_Value32NBO
2150 struct NeighbourMapEntry *n;
2151 struct GNUNET_TRANSPORT_PluginFunctions *papi;
2153 GNUNET_assert (address->transport_name != NULL);
2154 if (NULL == (n = lookup_neighbour (peer)))
2157 /* Obtain an session for this address from plugin */
2158 if (NULL == (papi = GST_plugins_find (address->transport_name)))
2160 /* we don't have the plugin for this address */
2161 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2164 if ((NULL == session) && (0 == address->address_length))
2167 if (strlen (address->transport_name) > 0)
2168 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2172 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2173 "ATS tells us to switch to address '%s' session %p for peer `%s' in state %s\n",
2174 (address->address_length != 0) ? GST_plugins_a2s (address): "<inbound>",
2177 print_state (n->state));
2179 if (NULL == session)
2181 session = papi->get_session (papi->cls, address);
2182 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2183 "Obtained new session for peer `%s' and address '%s': %p\n",
2184 GNUNET_i2s (&address->peer), GST_plugins_a2s (address), session);
2186 if (NULL == session)
2188 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2189 "Failed to obtain new session for peer `%s' and address '%s'\n",
2190 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
2191 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2196 case S_NOT_CONNECTED:
2198 free_neighbour (n, GNUNET_NO);
2201 set_address (&n->primary_address,
2202 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2203 n->state = S_INIT_BLACKLIST;
2204 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2205 check_blacklist (&n->id,
2206 n->connect_ack_timestamp,
2207 address, session, ats, ats_count);
2209 case S_INIT_BLACKLIST:
2210 /* ATS suggests a different address, switch again */
2211 set_address (&n->primary_address,
2212 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2213 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2214 check_blacklist (&n->id,
2215 n->connect_ack_timestamp,
2216 address, session, ats, ats_count);
2218 case S_CONNECT_SENT:
2219 /* ATS suggests a different address, switch again */
2220 set_address (&n->primary_address,
2221 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2222 n->state = S_INIT_BLACKLIST;
2223 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2224 check_blacklist (&n->id,
2225 n->connect_ack_timestamp,
2226 address, session, ats, ats_count);
2228 case S_CONNECT_RECV_ATS:
2229 set_address (&n->primary_address,
2230 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2231 n->state = S_CONNECT_RECV_BLACKLIST;
2232 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2233 check_blacklist (&n->id,
2234 n->connect_ack_timestamp,
2235 address, session, ats, ats_count);
2237 case S_CONNECT_RECV_BLACKLIST_INBOUND:
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);
2243 case S_CONNECT_RECV_BLACKLIST:
2244 case S_CONNECT_RECV_ACK:
2245 /* ATS asks us to switch while we were trying to connect; switch to new
2246 address and check blacklist again */
2247 set_address (&n->primary_address,
2248 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2249 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2250 check_blacklist (&n->id,
2251 n->connect_ack_timestamp,
2252 address, session, ats, ats_count);
2255 GNUNET_assert (NULL != n->primary_address.address);
2256 GNUNET_assert (NULL != n->primary_address.session);
2257 if (n->primary_address.session == session)
2259 /* not an address change, just a quota change */
2260 set_address (&n->primary_address,
2261 address, session, bandwidth_in, bandwidth_out, GNUNET_YES);
2264 /* ATS asks us to switch a life connection; see if we can get
2265 a CONNECT_ACK on it before we actually do this! */
2266 set_address (&n->alternative_address,
2267 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2268 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2269 check_blacklist (&n->id,
2270 GNUNET_TIME_absolute_get (),
2271 address, session, ats, ats_count);
2273 case S_RECONNECT_ATS:
2274 set_address (&n->primary_address,
2275 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2276 n->state = S_RECONNECT_BLACKLIST;
2277 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2278 check_blacklist (&n->id,
2279 n->connect_ack_timestamp,
2280 address, session, ats, ats_count);
2282 case S_RECONNECT_BLACKLIST:
2283 /* ATS asks us to switch while we were trying to reconnect; switch to new
2284 address and check blacklist again */
2285 set_address (&n->primary_address,
2286 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
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_RECONNECT_SENT:
2293 /* ATS asks us to switch while we were trying to reconnect; switch to new
2294 address and check blacklist again */
2295 set_address (&n->primary_address,
2296 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2297 n->state = S_RECONNECT_BLACKLIST;
2298 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2299 check_blacklist (&n->id,
2300 n->connect_ack_timestamp,
2301 address, session, ats, ats_count);
2303 case S_CONNECTED_SWITCHING_BLACKLIST:
2304 if (n->primary_address.session == session)
2306 /* ATS switches back to still-active session */
2307 free_address (&n->alternative_address);
2308 n->state = S_CONNECTED;
2311 /* ATS asks us to switch a life connection, update blacklist check */
2312 set_address (&n->alternative_address,
2313 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2314 check_blacklist (&n->id,
2315 GNUNET_TIME_absolute_get (),
2316 address, session, ats, ats_count);
2318 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2319 if (n->primary_address.session == session)
2321 /* ATS switches back to still-active session */
2322 free_address (&n->alternative_address);
2323 n->state = S_CONNECTED;
2326 /* ATS asks us to switch a life connection, update blacklist check */
2327 set_address (&n->alternative_address,
2328 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2329 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2330 check_blacklist (&n->id,
2331 GNUNET_TIME_absolute_get (),
2332 address, session, ats, ats_count);
2335 /* not going to switch addresses while disconnecting */
2337 case S_DISCONNECT_FINISHED:
2341 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2349 * Master task run for every neighbour. Performs all of the time-related
2350 * activities (keep alive, send next message, disconnect if idle, finish
2351 * clean up after disconnect).
2353 * @param cls the 'struct NeighbourMapEntry' for which we are running
2354 * @param tc scheduler context (unused)
2357 master_task (void *cls,
2358 const struct GNUNET_SCHEDULER_TaskContext *tc)
2360 struct NeighbourMapEntry *n = cls;
2361 struct GNUNET_TIME_Relative delay;
2363 n->task = GNUNET_SCHEDULER_NO_TASK;
2364 delay = GNUNET_TIME_absolute_get_remaining (n->timeout);
2365 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2366 "Master task runs for neighbour `%s' in state %s with timeout in %llu ms\n",
2367 GNUNET_i2s (&n->id),
2368 print_state(n->state),
2369 (unsigned long long) delay.rel_value);
2372 case S_NOT_CONNECTED:
2373 /* invalid state for master task, clean up */
2375 n->state = S_DISCONNECT_FINISHED;
2376 free_neighbour (n, GNUNET_NO);
2379 if (0 == delay.rel_value)
2381 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2382 "Connection to `%s' timed out waiting for ATS to provide address\n",
2383 GNUNET_i2s (&n->id));
2384 n->state = S_DISCONNECT_FINISHED;
2385 free_neighbour (n, GNUNET_NO);
2389 case S_INIT_BLACKLIST:
2390 if (0 == delay.rel_value)
2392 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2393 "Connection to `%s' timed out waiting for BLACKLIST to approve address\n",
2394 GNUNET_i2s (&n->id));
2395 n->state = S_DISCONNECT_FINISHED;
2396 free_neighbour (n, GNUNET_NO);
2400 case S_CONNECT_SENT:
2401 if (0 == delay.rel_value)
2403 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2404 "Connection to `%s' timed out waiting for other peer to send CONNECT_ACK\n",
2405 GNUNET_i2s (&n->id));
2406 disconnect_neighbour (n);
2410 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2411 if (0 == delay.rel_value)
2413 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2414 "Connection to `%s' timed out waiting BLACKLIST to approve address to use for received CONNECT\n",
2415 GNUNET_i2s (&n->id));
2416 n->state = S_DISCONNECT_FINISHED;
2417 free_neighbour (n, GNUNET_NO);
2421 case S_CONNECT_RECV_ATS:
2422 if (0 == delay.rel_value)
2424 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2425 "Connection to `%s' timed out waiting ATS to provide 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_BLACKLIST:
2433 if (0 == delay.rel_value)
2435 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2436 "Connection to `%s' timed out waiting BLACKLIST to approve address to use for CONNECT_ACK\n",
2437 GNUNET_i2s (&n->id));
2438 n->state = S_DISCONNECT_FINISHED;
2439 free_neighbour (n, GNUNET_NO);
2443 case S_CONNECT_RECV_ACK:
2444 if (0 == delay.rel_value)
2446 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2447 "Connection to `%s' timed out waiting for other peer to send SESSION_ACK\n",
2448 GNUNET_i2s (&n->id));
2449 disconnect_neighbour (n);
2454 if (0 == delay.rel_value)
2456 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2457 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2458 GNUNET_i2s (&n->id));
2459 disconnect_neighbour (n);
2462 try_transmission_to_peer (n);
2465 case S_RECONNECT_ATS:
2466 if (0 == delay.rel_value)
2468 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2469 "Connection to `%s' timed out, waiting for ATS replacement address\n",
2470 GNUNET_i2s (&n->id));
2471 disconnect_neighbour (n);
2475 case S_RECONNECT_BLACKLIST:
2476 if (0 == delay.rel_value)
2478 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2479 "Connection to `%s' timed out, waiting for BLACKLIST to approve replacement address\n",
2480 GNUNET_i2s (&n->id));
2481 disconnect_neighbour (n);
2485 case S_RECONNECT_SENT:
2486 if (0 == delay.rel_value)
2488 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2489 "Connection to `%s' timed out, waiting for other peer to CONNECT_ACK replacement address\n",
2490 GNUNET_i2s (&n->id));
2491 disconnect_neighbour (n);
2495 case S_CONNECTED_SWITCHING_BLACKLIST:
2496 if (0 == delay.rel_value)
2498 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2499 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2500 GNUNET_i2s (&n->id));
2501 disconnect_neighbour (n);
2504 try_transmission_to_peer (n);
2507 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2508 if (0 == delay.rel_value)
2510 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2511 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs (after trying to CONNECT on alternative address)\n",
2512 GNUNET_i2s (&n->id));
2513 disconnect_neighbour (n);
2516 try_transmission_to_peer (n);
2520 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2521 "Cleaning up connection to `%s' after sending DISCONNECT\n",
2522 GNUNET_i2s (&n->id));
2523 free_neighbour (n, GNUNET_NO);
2525 case S_DISCONNECT_FINISHED:
2526 /* how did we get here!? */
2530 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2534 if ( (S_CONNECTED_SWITCHING_CONNECT_SENT == n->state) ||
2535 (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
2536 (S_CONNECTED == n->state) )
2538 /* if we are *now* in one of these three states, we're sending
2539 keep alive messages, so we need to consider the keepalive
2540 delay, not just the connection timeout */
2541 delay = GNUNET_TIME_relative_min (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time),
2544 if (GNUNET_SCHEDULER_NO_TASK == n->task)
2545 n->task = GNUNET_SCHEDULER_add_delayed (delay,
2552 * Send a SESSION_ACK message to the neighbour to confirm that we
2553 * got his CONNECT_ACK.
2555 * @param n neighbour to send the SESSION_ACK to
2558 send_session_ack_message (struct NeighbourMapEntry *n)
2560 struct GNUNET_MessageHeader msg;
2562 msg.size = htons (sizeof (struct GNUNET_MessageHeader));
2563 msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK);
2564 (void) send_with_session(n,
2565 (const char *) &msg, sizeof (struct GNUNET_MessageHeader),
2566 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
2572 * We received a 'SESSION_CONNECT_ACK' message from the other peer.
2573 * Consider switching to it.
2575 * @param message possibly a 'struct SessionConnectMessage' (check format)
2576 * @param peer identity of the peer to switch the address for
2577 * @param address address of the other peer, NULL if other peer
2579 * @param session session to use (or NULL)
2580 * @param ats performance data
2581 * @param ats_count number of entries in ats
2584 GST_neighbours_handle_connect_ack (const struct GNUNET_MessageHeader *message,
2585 const struct GNUNET_PeerIdentity *peer,
2586 const struct GNUNET_HELLO_Address *address,
2587 struct Session *session,
2588 const struct GNUNET_ATS_Information *ats,
2591 const struct SessionConnectMessage *scm;
2592 struct GNUNET_TIME_Absolute ts;
2593 struct NeighbourMapEntry *n;
2595 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2596 "Received CONNECT_ACK message from peer `%s'\n",
2599 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2601 GNUNET_break_op (0);
2604 scm = (const struct SessionConnectMessage *) message;
2605 GNUNET_break_op (ntohl (scm->reserved) == 0);
2606 if (NULL == (n = lookup_neighbour (peer)))
2608 GNUNET_STATISTICS_update (GST_stats,
2610 ("# unexpected CONNECT_ACK messages (no peer)"),
2614 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2617 case S_NOT_CONNECTED:
2619 free_neighbour (n, GNUNET_NO);
2622 case S_INIT_BLACKLIST:
2623 GNUNET_STATISTICS_update (GST_stats,
2625 ("# unexpected CONNECT_ACK messages (not ready)"),
2628 case S_CONNECT_SENT:
2629 if (ts.abs_value != n->primary_address.connect_timestamp.abs_value)
2630 break; /* ACK does not match our original CONNECT message */
2631 n->state = S_CONNECTED;
2632 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2633 GNUNET_STATISTICS_set (GST_stats,
2634 gettext_noop ("# peers connected"),
2635 ++neighbours_connected,
2637 connect_notify_cb (callback_cls, &n->id, ats, ats_count);
2638 /* Tell ATS that the outbound session we created to send CONNECT was successfull */
2639 GNUNET_ATS_address_add (GST_ats,
2640 n->primary_address.address,
2641 n->primary_address.session,
2643 set_address (&n->primary_address,
2644 n->primary_address.address,
2645 n->primary_address.session,
2646 n->primary_address.bandwidth_in,
2647 n->primary_address.bandwidth_out,
2649 send_session_ack_message (n);
2651 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2652 case S_CONNECT_RECV_ATS:
2653 case S_CONNECT_RECV_BLACKLIST:
2654 case S_CONNECT_RECV_ACK:
2655 GNUNET_STATISTICS_update (GST_stats,
2657 ("# unexpected CONNECT_ACK messages (not ready)"),
2661 /* duplicate CONNECT_ACK, let's answer by duplciate SESSION_ACK just in case */
2662 send_session_ack_message (n);
2664 case S_RECONNECT_ATS:
2665 case S_RECONNECT_BLACKLIST:
2666 /* we didn't expect any CONNECT_ACK, as we are waiting for ATS
2667 to give us a new address... */
2668 GNUNET_STATISTICS_update (GST_stats,
2670 ("# unexpected CONNECT_ACK messages (waiting on ATS)"),
2673 case S_RECONNECT_SENT:
2674 /* new address worked; go back to connected! */
2675 n->state = S_CONNECTED;
2676 send_session_ack_message (n);
2678 case S_CONNECTED_SWITCHING_BLACKLIST:
2679 /* duplicate CONNECT_ACK, let's answer by duplciate SESSION_ACK just in case */
2680 send_session_ack_message (n);
2682 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2683 /* new address worked; adopt it and go back to connected! */
2684 n->state = S_CONNECTED;
2685 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2686 GNUNET_break (GNUNET_NO == n->alternative_address.ats_active);
2687 GNUNET_ATS_address_add(GST_ats,
2688 n->alternative_address.address,
2689 n->alternative_address.session,
2691 set_address (&n->primary_address,
2692 n->alternative_address.address,
2693 n->alternative_address.session,
2694 n->alternative_address.bandwidth_in,
2695 n->alternative_address.bandwidth_out,
2697 free_address (&n->alternative_address);
2698 send_session_ack_message (n);
2701 GNUNET_STATISTICS_update (GST_stats,
2703 ("# unexpected CONNECT_ACK messages (disconnecting)"),
2706 case S_DISCONNECT_FINISHED:
2710 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2718 * A session was terminated. Take note; if needed, try to get
2719 * an alternative address from ATS.
2721 * @param peer identity of the peer where the session died
2722 * @param session session that is gone
2723 * @return GNUNET_YES if this was a session used, GNUNET_NO if
2724 * this session was not in use
2727 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
2728 struct Session *session)
2730 struct NeighbourMapEntry *n;
2731 struct BlackListCheckContext *bcc;
2732 struct BlackListCheckContext *bcc_next;
2734 /* make sure to cancel all ongoing blacklist checks involving 'session' */
2736 while (NULL != (bcc = bcc_next))
2738 bcc_next = bcc->next;
2739 if (bcc->na.session == session)
2741 GST_blacklist_test_cancel (bcc->bc);
2742 GNUNET_HELLO_address_free (bcc->na.address);
2743 GNUNET_CONTAINER_DLL_remove (bc_head,
2749 if (NULL == (n = lookup_neighbour (peer)))
2750 return GNUNET_NO; /* can't affect us */
2751 if (session != n->primary_address.session)
2753 if (session == n->alternative_address.session)
2755 free_address (&n->alternative_address);
2756 if ( (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
2757 (S_CONNECTED_SWITCHING_CONNECT_SENT == n->state) )
2758 n->state = S_CONNECTED;
2762 return GNUNET_NO; /* doesn't affect us further */
2765 n->expect_latency_response = GNUNET_NO;
2768 case S_NOT_CONNECTED:
2770 free_neighbour (n, GNUNET_NO);
2774 free_neighbour (n, GNUNET_NO);
2776 case S_INIT_BLACKLIST:
2777 case S_CONNECT_SENT:
2778 free_address (&n->primary_address);
2779 n->state = S_INIT_ATS;
2780 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2781 // FIXME: need to ask ATS for suggestions again?
2782 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2784 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2785 case S_CONNECT_RECV_ATS:
2786 case S_CONNECT_RECV_BLACKLIST:
2787 case S_CONNECT_RECV_ACK:
2788 /* error on inbound session; free neighbour entirely */
2789 free_address (&n->primary_address);
2790 free_neighbour (n, GNUNET_NO);
2793 free_address (&n->primary_address);
2794 n->state = S_RECONNECT_ATS;
2795 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2796 /* FIXME: is this ATS call needed? */
2797 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2799 case S_RECONNECT_ATS:
2800 /* we don't have an address, how can it go down? */
2803 case S_RECONNECT_BLACKLIST:
2804 case S_RECONNECT_SENT:
2805 n->state = S_RECONNECT_ATS;
2806 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2807 // FIXME: need to ask ATS for suggestions again?
2808 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2810 case S_CONNECTED_SWITCHING_BLACKLIST:
2811 /* primary went down while we were checking secondary against
2812 blacklist, adopt secondary as primary */
2813 free_address (&n->primary_address);
2814 n->primary_address = n->alternative_address;
2815 memset (&n->alternative_address, 0, sizeof (struct NeighbourAddress));
2816 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
2817 n->state = S_RECONNECT_BLACKLIST;
2819 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2820 /* primary went down while we were waiting for CONNECT_ACK on secondary;
2821 secondary as primary */
2822 free_address (&n->primary_address);
2823 n->primary_address = n->alternative_address;
2824 memset (&n->alternative_address, 0, sizeof (struct NeighbourAddress));
2825 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
2826 n->state = S_RECONNECT_SENT;
2829 free_address (&n->primary_address);
2831 case S_DISCONNECT_FINISHED:
2832 /* neighbour was freed and plugins told to terminate session */
2836 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2840 if (GNUNET_SCHEDULER_NO_TASK != n->task)
2841 GNUNET_SCHEDULER_cancel (n->task);
2842 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
2848 * We received a 'SESSION_ACK' message from the other peer.
2849 * If we sent a 'CONNECT_ACK' last, this means we are now
2850 * connected. Otherwise, do nothing.
2852 * @param message possibly a 'struct SessionConnectMessage' (check format)
2853 * @param peer identity of the peer to switch the address for
2854 * @param address address of the other peer, NULL if other peer
2856 * @param session session to use (or NULL)
2857 * @param ats performance data
2858 * @param ats_count number of entries in ats
2861 GST_neighbours_handle_session_ack (const struct GNUNET_MessageHeader *message,
2862 const struct GNUNET_PeerIdentity *peer,
2863 const struct GNUNET_HELLO_Address *address,
2864 struct Session *session,
2865 const struct GNUNET_ATS_Information *ats,
2868 struct NeighbourMapEntry *n;
2870 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2871 "Received SESSION_ACK message from peer `%s'\n",
2873 if (ntohs (message->size) != sizeof (struct GNUNET_MessageHeader))
2875 GNUNET_break_op (0);
2878 if (NULL == (n = lookup_neighbour (peer)))
2880 /* check if we are in a plausible state for having sent
2881 a CONNECT_ACK. If not, return, otherwise break */
2882 if ( ( (S_CONNECT_RECV_ACK != n->state) &&
2883 (S_CONNECT_SENT != n->state) ) ||
2884 (2 != n->send_connect_ack) )
2886 GNUNET_STATISTICS_update (GST_stats,
2887 gettext_noop ("# unexpected SESSION ACK messages"), 1,
2891 n->state = S_CONNECTED;
2892 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2893 GNUNET_STATISTICS_set (GST_stats,
2894 gettext_noop ("# peers connected"),
2895 ++neighbours_connected,
2897 connect_notify_cb (callback_cls, &n->id, ats, ats_count);
2898 GNUNET_ATS_address_add(GST_ats,
2899 n->primary_address.address,
2900 n->primary_address.session,
2902 set_address (&n->primary_address,
2903 n->primary_address.address,
2904 n->primary_address.session,
2905 n->primary_address.bandwidth_in,
2906 n->primary_address.bandwidth_out,
2912 * Test if we're connected to the given peer.
2914 * @param target peer to test
2915 * @return GNUNET_YES if we are connected, GNUNET_NO if not
2918 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
2920 return test_connected (lookup_neighbour (target));
2925 * Change the incoming quota for the given peer.
2927 * @param neighbour identity of peer to change qutoa for
2928 * @param quota new quota
2931 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
2932 struct GNUNET_BANDWIDTH_Value32NBO quota)
2934 struct NeighbourMapEntry *n;
2936 if (NULL == (n = lookup_neighbour (neighbour)))
2938 GNUNET_STATISTICS_update (GST_stats,
2940 ("# SET QUOTA messages ignored (no such peer)"),
2944 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2945 "Setting inbound quota of %u Bps for peer `%s' to all clients\n",
2946 ntohl (quota.value__), GNUNET_i2s (&n->id));
2947 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
2948 if (0 != ntohl (quota.value__))
2950 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
2951 GNUNET_i2s (&n->id), "SET_QUOTA");
2952 if (GNUNET_YES == test_connected (n))
2953 GNUNET_STATISTICS_update (GST_stats,
2954 gettext_noop ("# disconnects due to quota of 0"),
2956 disconnect_neighbour (n);
2961 * We received a disconnect message from the given peer,
2962 * validate and process.
2964 * @param peer sender of the message
2965 * @param msg the disconnect message
2968 GST_neighbours_handle_disconnect_message (const struct GNUNET_PeerIdentity
2970 const struct GNUNET_MessageHeader
2973 struct NeighbourMapEntry *n;
2974 const struct SessionDisconnectMessage *sdm;
2975 struct GNUNET_HashCode hc;
2977 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2978 "Received DISCONNECT message from peer `%s'\n",
2980 if (ntohs (msg->size) != sizeof (struct SessionDisconnectMessage))
2982 // GNUNET_break_op (0);
2983 GNUNET_STATISTICS_update (GST_stats,
2985 ("# disconnect messages ignored (old format)"), 1,
2989 sdm = (const struct SessionDisconnectMessage *) msg;
2990 if (NULL == (n = lookup_neighbour (peer)))
2991 return; /* gone already */
2992 if (GNUNET_TIME_absolute_ntoh (sdm->timestamp).abs_value <= n->connect_ack_timestamp.abs_value)
2994 GNUNET_STATISTICS_update (GST_stats,
2996 ("# disconnect messages ignored (timestamp)"), 1,
3000 GNUNET_CRYPTO_hash (&sdm->public_key,
3001 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3003 if (0 != memcmp (peer, &hc, sizeof (struct GNUNET_PeerIdentity)))
3005 GNUNET_break_op (0);
3008 if (ntohl (sdm->purpose.size) !=
3009 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3010 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
3011 sizeof (struct GNUNET_TIME_AbsoluteNBO))
3013 GNUNET_break_op (0);
3017 GNUNET_CRYPTO_rsa_verify
3018 (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT, &sdm->purpose,
3019 &sdm->signature, &sdm->public_key))
3021 GNUNET_break_op (0);
3024 if (GNUNET_YES == test_connected (n))
3025 GNUNET_STATISTICS_update (GST_stats,
3027 ("# other peer asked to disconnect from us"), 1,
3029 disconnect_neighbour (n);
3034 * Closure for the neighbours_iterate function.
3036 struct IteratorContext
3039 * Function to call on each connected neighbour.
3041 GST_NeighbourIterator cb;
3051 * Call the callback from the closure for each connected neighbour.
3053 * @param cls the 'struct IteratorContext'
3054 * @param key the hash of the public key of the neighbour
3055 * @param value the 'struct NeighbourMapEntry'
3056 * @return GNUNET_OK (continue to iterate)
3059 neighbours_iterate (void *cls, const struct GNUNET_HashCode * key, void *value)
3061 struct IteratorContext *ic = cls;
3062 struct NeighbourMapEntry *n = value;
3064 if (GNUNET_YES == test_connected (n))
3065 ic->cb (ic->cb_cls, &n->id, NULL, 0, n->primary_address.address);
3071 * Iterate over all connected neighbours.
3073 * @param cb function to call
3074 * @param cb_cls closure for cb
3077 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
3079 struct IteratorContext ic;
3081 if (NULL == neighbours)
3082 return; /* can happen during shutdown */
3085 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
3090 * If we have an active connection to the given target, it must be shutdown.
3092 * @param target peer to disconnect from
3095 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
3097 struct NeighbourMapEntry *n;
3099 if (NULL == (n = lookup_neighbour (target)))
3100 return; /* not active */
3101 if (GNUNET_YES == test_connected (n))
3102 GNUNET_STATISTICS_update (GST_stats,
3104 ("# disconnected from peer upon explicit request"), 1,
3106 disconnect_neighbour (n);
3111 * Obtain current latency information for the given neighbour.
3113 * @param peer to get the latency for
3114 * @return observed latency of the address, FOREVER if the
3115 * the connection is not up
3117 struct GNUNET_TIME_Relative
3118 GST_neighbour_get_latency (const struct GNUNET_PeerIdentity *peer)
3120 struct NeighbourMapEntry *n;
3122 n = lookup_neighbour (peer);
3124 return GNUNET_TIME_UNIT_FOREVER_REL;
3128 case S_CONNECTED_SWITCHING_CONNECT_SENT:
3129 case S_CONNECTED_SWITCHING_BLACKLIST:
3130 case S_RECONNECT_SENT:
3131 case S_RECONNECT_ATS:
3132 case S_RECONNECT_BLACKLIST:
3134 case S_NOT_CONNECTED:
3135 case S_INIT_BLACKLIST:
3137 case S_CONNECT_RECV_BLACKLIST_INBOUND:
3138 case S_CONNECT_RECV_ATS:
3139 case S_CONNECT_RECV_BLACKLIST:
3140 case S_CONNECT_RECV_ACK:
3141 case S_CONNECT_SENT:
3143 case S_DISCONNECT_FINISHED:
3144 return GNUNET_TIME_UNIT_FOREVER_REL;
3146 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
3150 return GNUNET_TIME_UNIT_FOREVER_REL;
3155 * Obtain current address information for the given neighbour.
3158 * @return address currently used
3160 struct GNUNET_HELLO_Address *
3161 GST_neighbour_get_current_address (const struct GNUNET_PeerIdentity *peer)
3163 struct NeighbourMapEntry *n;
3165 n = lookup_neighbour (peer);
3168 return n->primary_address.address;
3173 * Initialize the neighbours subsystem.
3175 * @param cls closure for callbacks
3176 * @param connect_cb function to call if we connect to a peer
3177 * @param disconnect_cb function to call if we disconnect from a peer
3178 * @param peer_address_cb function to call if we change an active address
3182 GST_neighbours_start (void *cls,
3183 GNUNET_TRANSPORT_NotifyConnect connect_cb,
3184 GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb,
3185 GNUNET_TRANSPORT_PeerIterateCallback peer_address_cb)
3188 connect_notify_cb = connect_cb;
3189 disconnect_notify_cb = disconnect_cb;
3190 address_change_cb = peer_address_cb;
3191 neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE);
3196 * Disconnect from the given neighbour.
3199 * @param key hash of neighbour's public key (not used)
3200 * @param value the 'struct NeighbourMapEntry' of the neighbour
3201 * @return GNUNET_OK (continue to iterate)
3204 disconnect_all_neighbours (void *cls, const struct GNUNET_HashCode * key, void *value)
3206 struct NeighbourMapEntry *n = value;
3208 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3209 "Disconnecting peer `%4s', %s\n",
3210 GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
3211 n->state = S_DISCONNECT_FINISHED;
3212 free_neighbour (n, GNUNET_NO);
3218 * Cleanup the neighbours subsystem.
3221 GST_neighbours_stop ()
3223 if (NULL == neighbours)
3225 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
3226 &disconnect_all_neighbours,
3228 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
3230 callback_cls = NULL;
3231 connect_notify_cb = NULL;
3232 disconnect_notify_cb = NULL;
3233 address_change_cb = NULL;
3237 /* end of file gnunet-service-transport_neighbours.c */