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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"
45 * Size of the neighbour hash map.
47 #define NEIGHBOUR_TABLE_SIZE 256
50 * Time we give plugin to transmit DISCONNECT message before the
51 * neighbour entry self-destructs.
53 #define DISCONNECT_SENT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 100)
56 * How often must a peer violate bandwidth quotas before we start
57 * to simply drop its messages?
59 #define QUOTA_VIOLATION_DROP_THRESHOLD 10
62 * How often do we send KEEPALIVE messages to each of our neighbours and measure
63 * the latency with this neighbour?
64 * (idle timeout is 5 minutes or 300 seconds, so with 100s interval we
65 * send 3 keepalives in each interval, so 3 messages would need to be
66 * lost in a row for a disconnect).
68 #define KEEPALIVE_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 100)
71 * How long are we willing to wait for a response from ATS before timing out?
73 #define ATS_RESPONSE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 500)
76 * How long are we willing to wait for an ACK from the other peer before
77 * giving up on our connect operation?
79 #define SETUP_CONNECTION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
82 * How long are we willing to wait for a successful reconnect if
83 * an existing connection went down? Much shorter than the
84 * usual SETUP_CONNECTION_TIMEOUT as we do not inform the
85 * higher layers about the disconnect during this period.
87 #define FAST_RECONNECT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1)
90 * How long are we willing to wait for a response from the blacklist
91 * subsystem before timing out?
93 #define BLACKLIST_RESPONSE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 500)
96 GNUNET_NETWORK_STRUCT_BEGIN
99 * Message a peer sends to another to indicate that it intends to
100 * setup a connection/session for data exchange. A 'SESSION_CONNECT'
101 * should be answered with a 'SESSION_CONNECT_ACK' with the same body
102 * to confirm. A 'SESSION_CONNECT_ACK' should then be followed with
103 * a 'SESSION_ACK'. Once the 'SESSION_ACK' is received, both peers
104 * should be connected.
106 struct SessionConnectMessage
109 * Header of type 'GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT'
110 * or 'GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT_ACK'
112 struct GNUNET_MessageHeader header;
117 uint32_t reserved GNUNET_PACKED;
120 * Absolute time at the sender. Only the most recent connect
121 * message implies which session is preferred by the sender.
123 struct GNUNET_TIME_AbsoluteNBO timestamp;
129 * Message we send to the other peer to notify him that we intentionally
130 * are disconnecting (to reduce timeouts). This is just a friendly
131 * notification, peers must not rely on always receiving disconnect
134 struct SessionDisconnectMessage
137 * Header of type 'GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT'
139 struct GNUNET_MessageHeader header;
144 uint32_t reserved GNUNET_PACKED;
147 * Purpose of the signature. Extends over the timestamp.
148 * Purpose should be GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DISCONNECT.
150 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
153 * Absolute time at the sender. Only the most recent connect
154 * message implies which session is preferred by the sender.
156 struct GNUNET_TIME_AbsoluteNBO timestamp;
159 * Public key of the sender.
161 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded public_key;
164 * Signature of the peer that sends us the disconnect. Only
165 * valid if the timestamp is AFTER the timestamp from the
166 * corresponding 'CONNECT' message.
168 struct GNUNET_CRYPTO_RsaSignature signature;
172 GNUNET_NETWORK_STRUCT_END
176 * For each neighbour we keep a list of messages
177 * that we still want to transmit to the neighbour.
183 * This is a doubly linked list.
185 struct MessageQueue *next;
188 * This is a doubly linked list.
190 struct MessageQueue *prev;
193 * Function to call once we're done.
195 GST_NeighbourSendContinuation cont;
203 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
204 * stuck together in memory. Allocated at the end of this struct.
206 const char *message_buf;
209 * Size of the message buf
211 size_t message_buf_size;
214 * At what time should we fail?
216 struct GNUNET_TIME_Absolute timeout;
222 * Possible state of a neighbour. Initially, we are S_NOT_CONNECTED.
224 * Then, there are two main paths. If we receive a CONNECT message, we
225 * first run a check against the blacklist (S_CONNECT_RECV_BLACKLIST_INBOUND).
226 * If this check is successful, we give the inbound address to ATS.
227 * After the check we ask ATS for a suggestion (S_CONNECT_RECV_ATS).
228 * If ATS makes a suggestion, we ALSO give that suggestion to the blacklist
229 * (S_CONNECT_RECV_BLACKLIST). Once the blacklist approves the
230 * address we got from ATS, we send our CONNECT_ACK and go to
231 * S_CONNECT_RECV_ACK. If we receive a SESSION_ACK, we go to
232 * S_CONNECTED (and notify everyone about the new connection). If the
233 * operation times out, we go to S_DISCONNECT.
235 * The other case is where we transmit a CONNECT message first. We
236 * start with S_INIT_ATS. If we get an address, we enter
237 * S_INIT_BLACKLIST and check the blacklist. If the blacklist is OK
238 * with the connection, we actually send the CONNECT message and go to
239 * state S_CONNECT_SENT. Once we receive a CONNECT_ACK, we go to
240 * S_CONNECTED (and notify everyone about the new connection and send
241 * back a SESSION_ACK). If the operation times out, we go to
244 * If the session is in trouble (i.e. transport-level disconnect or
245 * timeout), we go to S_RECONNECT_ATS where we ask ATS for a new
246 * address (we don't notify anyone about the disconnect yet). Once we
247 * have a new address, we go to S_RECONNECT_BLACKLIST to check the new
248 * address against the blacklist. If the blacklist approves, we enter
249 * S_RECONNECT_SENT and send a CONNECT message. If we receive a
250 * CONNECT_ACK, we go to S_CONNECTED and nobody noticed that we had
251 * trouble; we also send a SESSION_ACK at this time just in case. If
252 * the operation times out, we go to S_DISCONNECT (and notify everyone
253 * about the lost connection).
255 * If ATS decides to switch addresses while we have a normal
256 * connection, we go to S_CONNECTED_SWITCHING_BLACKLIST to check the
257 * new address against the blacklist. If the blacklist approves, we
258 * go to S_CONNECTED_SWITCHING_CONNECT_SENT and send a
259 * SESSION_CONNECT. If we get a SESSION_ACK back, we switch the
260 * primary connection to the suggested alternative from ATS, go back
261 * to S_CONNECTED and send a SESSION_ACK to the other peer just to be
262 * sure. If the operation times out (or the blacklist disapproves),
263 * we go to S_CONNECTED (and notify ATS that the given alternative
264 * address is "invalid").
266 * Once a session is in S_DISCONNECT, it is cleaned up and then goes
267 * to (S_DISCONNECT_FINISHED). If we receive an explicit disconnect
268 * request, we can go from any state to S_DISCONNECT, possibly after
269 * generating disconnect notifications.
271 * Note that it is quite possible that while we are in any of these
272 * states, we could receive a 'CONNECT' request from the other peer.
273 * We then enter a 'weird' state where we pursue our own primary state
274 * machine (as described above), but with the 'send_connect_ack' flag
275 * set to 1. If our state machine allows us to send a 'CONNECT_ACK'
276 * (because we have an acceptable address), we send the 'CONNECT_ACK'
277 * and set the 'send_connect_ack' to 2. If we then receive a
278 * 'SESSION_ACK', we go to 'S_CONNECTED' (and reset 'send_connect_ack'
285 * fresh peer or completely disconnected
290 * Asked to initiate connection, trying to get address from ATS
295 * Asked to initiate connection, trying to get address approved
301 * Sent CONNECT message to other peer, waiting for CONNECT_ACK
306 * Received a CONNECT, do a blacklist check for inbound address
308 S_CONNECT_RECV_BLACKLIST_INBOUND,
311 * Received a CONNECT, asking ATS about address suggestions.
316 * Received CONNECT from other peer, got an address, checking with blacklist.
318 S_CONNECT_RECV_BLACKLIST,
321 * CONNECT request from other peer was SESSION_ACK'ed, waiting for
327 * Got our CONNECT_ACK/SESSION_ACK, connection is up.
332 * Connection got into trouble, rest of the system still believes
333 * it to be up, but we're getting a new address from ATS.
338 * Connection got into trouble, rest of the system still believes
339 * it to be up; we are checking the new address against the blacklist.
341 S_RECONNECT_BLACKLIST,
344 * Sent CONNECT over new address (either by ATS telling us to switch
345 * addresses or from RECONNECT_ATS); if this fails, we need to tell
346 * the rest of the system about a disconnect.
351 * We have some primary connection, but ATS suggested we switch
352 * to some alternative; we're now checking the alternative against
355 S_CONNECTED_SWITCHING_BLACKLIST,
358 * We have some primary connection, but ATS suggested we switch
359 * to some alternative; we now sent a CONNECT message for the
360 * alternative session to the other peer and waiting for a
361 * CONNECT_ACK to make this our primary connection.
363 S_CONNECTED_SWITCHING_CONNECT_SENT,
366 * Disconnect in progress (we're sending the DISCONNECT message to the
367 * other peer; after that is finished, the state will be cleaned up).
372 * We're finished with the disconnect; and are cleaning up the state
373 * now! We put the struct into this state when we are really in the
374 * task that calls 'free' on it and are about to remove the record
375 * from the map. We should never find a 'struct NeighbourMapEntry'
376 * in this state in the map. Accessing a 'struct NeighbourMapEntry'
377 * in this state virtually always means using memory that has been
378 * freed (the exception being the cleanup code in 'free_neighbour').
380 S_DISCONNECT_FINISHED
385 * A possible address we could use to communicate with a neighbour.
387 struct NeighbourAddress
391 * Active session for this address.
393 struct Session *session;
396 * Network-level address information.
398 struct GNUNET_HELLO_Address *address;
401 * Timestamp of the 'SESSION_CONNECT' message we sent to the other
402 * peer for this address. Use to check that the ACK is in response
403 * to our most recent 'CONNECT'.
405 struct GNUNET_TIME_Absolute connect_timestamp;
408 * Inbound bandwidth from ATS for this address.
410 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in;
413 * Outbound bandwidth from ATS for this address.
415 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out;
418 * Did we tell ATS that this is our 'active' address?
426 * Entry in neighbours.
428 struct NeighbourMapEntry
432 * Head of list of messages we would like to send to this peer;
433 * must contain at most one message per client.
435 struct MessageQueue *messages_head;
438 * Tail of list of messages we would like to send to this peer; must
439 * contain at most one message per client.
441 struct MessageQueue *messages_tail;
444 * Are we currently trying to send a message? If so, which one?
446 struct MessageQueue *is_active;
449 * Primary address we currently use to communicate with the neighbour.
451 struct NeighbourAddress primary_address;
454 * Alternative address currently under consideration for communicating
455 * with the neighbour.
457 struct NeighbourAddress alternative_address;
460 * Identity of this neighbour.
462 struct GNUNET_PeerIdentity id;
465 * Main task that drives this peer (timeouts, keepalives, etc.).
466 * Always runs the 'master_task'.
468 GNUNET_SCHEDULER_TaskIdentifier task;
471 * At what time should we sent the next keep-alive message?
473 struct GNUNET_TIME_Absolute keep_alive_time;
476 * At what time did we sent the last keep-alive message? Used
477 * to calculate round-trip time ("latency").
479 struct GNUNET_TIME_Absolute last_keep_alive_time;
482 * Timestamp we should include in our next CONNECT_ACK message.
483 * (only valid if 'send_connect_ack' is GNUNET_YES). Used to build
484 * our CONNECT_ACK message.
486 struct GNUNET_TIME_Absolute connect_ack_timestamp;
489 * Time where we should cut the connection (timeout) if we don't
490 * make progress in the state machine (or get a KEEPALIVE_RESPONSE
491 * if we are in S_CONNECTED).
493 struct GNUNET_TIME_Absolute timeout;
496 * Latest calculated latency value
498 struct GNUNET_TIME_Relative latency;
501 * Tracker for inbound bandwidth.
503 struct GNUNET_BANDWIDTH_Tracker in_tracker;
506 * How often has the other peer (recently) violated the inbound
507 * traffic limit? Incremented by 10 per violation, decremented by 1
508 * per non-violation (for each time interval).
510 unsigned int quota_violation_count;
513 * The current state of the peer.
518 * Did we sent an KEEP_ALIVE message and are we expecting a response?
520 int expect_latency_response;
523 * Flag to set if we still need to send a CONNECT_ACK message to the other peer
524 * (once we have an address to use and the peer has been allowed by our
525 * blacklist). Set to 1 if we need to send a CONNECT_ACK. Set to 2 if we
526 * did send a CONNECT_ACK and should go to 'S_CONNECTED' upon receiving
527 * a 'SESSION_ACK' (regardless of what our own state machine might say).
529 int send_connect_ack;
535 * Context for blacklist checks and the 'handle_test_blacklist_cont'
536 * function. Stores information about ongoing blacklist checks.
538 struct BlackListCheckContext
542 * We keep blacklist checks in a DLL.
544 struct BlackListCheckContext *next;
547 * We keep blacklist checks in a DLL.
549 struct BlackListCheckContext *prev;
552 * Address that is being checked.
554 struct NeighbourAddress na;
557 * ATS information about the address.
559 struct GNUNET_ATS_Information *ats;
562 * Handle to the ongoing blacklist check.
564 struct GST_BlacklistCheck *bc;
567 * Size of the 'ats' array.
575 * Hash map from peer identities to the respective 'struct NeighbourMapEntry'.
577 static struct GNUNET_CONTAINER_MultiHashMap *neighbours;
580 * We keep blacklist checks in a DLL so that we can find
581 * the 'sessions' in their 'struct NeighbourAddress' if
582 * a session goes down.
584 static struct BlackListCheckContext *bc_head;
587 * We keep blacklist checks in a DLL.
589 static struct BlackListCheckContext *bc_tail;
592 * Closure for connect_notify_cb, disconnect_notify_cb and address_change_cb
594 static void *callback_cls;
597 * Function to call when we connected to a neighbour.
599 static NotifyConnect connect_notify_cb;
602 * Function to call when we disconnected from a neighbour.
604 static GNUNET_TRANSPORT_NotifyDisconnect disconnect_notify_cb;
607 * Function to call when we changed an active address of a neighbour.
609 static GNUNET_TRANSPORT_PeerIterateCallback address_change_cb;
612 * counter for connected neighbours
614 static unsigned int neighbours_connected;
617 * Number of bytes we have currently queued for transmission.
619 static unsigned long long bytes_in_send_queue;
623 * Lookup a neighbour entry in the neighbours hash map.
625 * @param pid identity of the peer to look up
626 * @return the entry, NULL if there is no existing record
628 static struct NeighbourMapEntry *
629 lookup_neighbour (const struct GNUNET_PeerIdentity *pid)
631 if (NULL == neighbours)
633 return GNUNET_CONTAINER_multihashmap_get (neighbours, &pid->hashPubKey);
637 print_state (int state)
642 case S_NOT_CONNECTED:
643 return "S_NOT_CONNECTED";
646 case S_INIT_BLACKLIST:
647 return "S_INIT_BLACKLIST";
649 return "S_CONNECT_SENT";
650 case S_CONNECT_RECV_BLACKLIST_INBOUND:
651 return "S_CONNECT_RECV_BLACKLIST_INBOUND";
652 case S_CONNECT_RECV_ATS:
653 return "S_CONNECT_RECV_ATS";
654 case S_CONNECT_RECV_BLACKLIST:
655 return "S_CONNECT_RECV_BLACKLIST";
656 case S_CONNECT_RECV_ACK:
657 return "S_CONNECT_RECV_ACK";
659 return "S_CONNECTED";
660 case S_RECONNECT_ATS:
661 return "S_RECONNECT_ATS";
662 case S_RECONNECT_BLACKLIST:
663 return "S_RECONNECT_BLACKLIST";
664 case S_RECONNECT_SENT:
665 return "S_RECONNECT_SENT";
666 case S_CONNECTED_SWITCHING_BLACKLIST:
667 return "S_CONNECTED_SWITCHING_BLACKLIST";
668 case S_CONNECTED_SWITCHING_CONNECT_SENT:
669 return "S_CONNECTED_SWITCHING_CONNECT_SENT";
671 return "S_DISCONNECT";
672 case S_DISCONNECT_FINISHED:
673 return "S_DISCONNECT_FINISHED";
682 * Test if we're connected to the given peer.
684 * @param n neighbour entry of peer to test
685 * @return GNUNET_YES if we are connected, GNUNET_NO if not
688 test_connected (struct NeighbourMapEntry *n)
694 case S_NOT_CONNECTED:
696 case S_INIT_BLACKLIST:
698 case S_CONNECT_RECV_BLACKLIST_INBOUND:
699 case S_CONNECT_RECV_ATS:
700 case S_CONNECT_RECV_BLACKLIST:
701 case S_CONNECT_RECV_ACK:
704 case S_RECONNECT_ATS:
705 case S_RECONNECT_BLACKLIST:
706 case S_RECONNECT_SENT:
707 case S_CONNECTED_SWITCHING_BLACKLIST:
708 case S_CONNECTED_SWITCHING_CONNECT_SENT:
711 case S_DISCONNECT_FINISHED:
714 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
718 return GNUNET_SYSERR;
722 * Send information about a new outbound quota to our clients.
724 * @param target affected peer
725 * @param quota new quota
728 send_outbound_quota (const struct GNUNET_PeerIdentity *target,
729 struct GNUNET_BANDWIDTH_Value32NBO quota)
731 struct QuotaSetMessage q_msg;
733 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
734 "Sending outbound quota of %u Bps for peer `%s' to all clients\n",
735 ntohl (quota.value__), GNUNET_i2s (target));
736 q_msg.header.size = htons (sizeof (struct QuotaSetMessage));
737 q_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA);
739 q_msg.peer = (*target);
740 GST_clients_broadcast (&q_msg.header, GNUNET_NO);
745 * We don't need a given neighbour address any more.
746 * Release its resources and give appropriate notifications
747 * to ATS and other subsystems.
749 * @param na address we are done with; 'na' itself must NOT be 'free'd, only the contents!
752 free_address (struct NeighbourAddress *na)
754 if (GNUNET_YES == na->ats_active)
756 GST_validation_set_address_use (na->address, na->session, GNUNET_NO, __LINE__);
757 GNUNET_ATS_address_in_use (GST_ats, na->address, na->session, GNUNET_NO);
760 na->ats_active = GNUNET_NO;
761 if (NULL != na->address)
763 GNUNET_HELLO_address_free (na->address);
771 * Initialize the 'struct NeighbourAddress'.
773 * @param na neighbour address to initialize
774 * @param address address of the other peer, NULL if other peer
776 * @param session session to use (or NULL, in which case an
777 * address must be setup)
778 * @param bandwidth_in inbound quota to be used when connection is up
779 * @param bandwidth_out outbound quota to be used when connection is up
780 * @param is_active GNUNET_YES to mark this as the active address with ATS
783 set_address (struct NeighbourAddress *na,
784 const struct GNUNET_HELLO_Address *address,
785 struct Session *session,
786 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
787 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
790 struct GNUNET_TRANSPORT_PluginFunctions *papi;
792 if (NULL == (papi = GST_plugins_find (address->transport_name)))
797 if (session == na->session)
799 na->bandwidth_in = bandwidth_in;
800 na->bandwidth_out = bandwidth_out;
801 if (is_active != na->ats_active)
803 na->ats_active = is_active;
804 GNUNET_ATS_address_in_use (GST_ats, na->address, na->session, is_active);
805 GST_validation_set_address_use (na->address, na->session, is_active, __LINE__);
807 if (GNUNET_YES == is_active)
809 /* FIXME: is this the right place to set quotas? */
810 GST_neighbours_set_incoming_quota (&address->peer, bandwidth_in);
811 send_outbound_quota (&address->peer, bandwidth_out);
817 session = papi->get_session (papi->cls, address);
820 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
821 "Failed to obtain new session for peer `%s' and address '%s'\n",
822 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
823 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
826 na->address = GNUNET_HELLO_address_copy (address);
827 na->bandwidth_in = bandwidth_in;
828 na->bandwidth_out = bandwidth_out;
829 na->session = session;
830 na->ats_active = is_active;
831 if (GNUNET_YES == is_active)
833 /* Telling ATS about new session */
834 GNUNET_ATS_address_in_use (GST_ats, na->address, na->session, GNUNET_YES);
835 GST_validation_set_address_use (na->address, na->session, GNUNET_YES, __LINE__);
837 /* FIXME: is this the right place to set quotas? */
838 GST_neighbours_set_incoming_quota (&address->peer, bandwidth_in);
839 send_outbound_quota (&address->peer, bandwidth_out);
845 * Free a neighbour map entry.
847 * @param n entry to free
848 * @param keep_sessions GNUNET_NO to tell plugin to terminate sessions,
849 * GNUNET_YES to keep all sessions
852 free_neighbour (struct NeighbourMapEntry *n, int keep_sessions)
854 struct MessageQueue *mq;
855 struct GNUNET_TRANSPORT_PluginFunctions *papi;
856 struct GNUNET_HELLO_Address *backup_primary;
858 n->is_active = NULL; /* always free'd by its own continuation! */
860 /* fail messages currently in the queue */
861 while (NULL != (mq = n->messages_head))
863 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
864 if (NULL != mq->cont)
865 mq->cont (mq->cont_cls, GNUNET_SYSERR);
868 /* It is too late to send other peer disconnect notifications, but at
869 least internally we need to get clean... */
870 if (GNUNET_YES == test_connected (n))
872 GNUNET_STATISTICS_set (GST_stats,
873 gettext_noop ("# peers connected"),
874 --neighbours_connected,
876 disconnect_notify_cb (callback_cls, &n->id);
879 n->state = S_DISCONNECT_FINISHED;
881 if (NULL != n->primary_address.address)
882 backup_primary = GNUNET_HELLO_address_copy(n->primary_address.address);
884 backup_primary = NULL;
886 /* free addresses and mark as unused */
887 free_address (&n->primary_address);
888 free_address (&n->alternative_address);
890 /* FIXME-PLUGIN-API: This does not seem to guarantee that all
891 transport sessions eventually get killed due to inactivity; they
892 MUST have their own timeout logic (but at least TCP doesn't have
893 one yet). Are we sure that EVERY 'session' of a plugin is
894 actually cleaned up this way!? Note that if we are switching
895 between two TCP sessions to the same peer, the existing plugin
896 API gives us not even the means to selectively kill only one of
897 them! Killing all sessions like this seems to be very, very
900 /* cut transport-level connection */
901 if ((GNUNET_NO == keep_sessions) &&
902 (NULL != backup_primary) &&
903 (NULL != (papi = GST_plugins_find (backup_primary->transport_name))))
904 papi->disconnect (papi->cls, &n->id);
906 GNUNET_free_non_null (backup_primary);
908 GNUNET_assert (GNUNET_YES ==
909 GNUNET_CONTAINER_multihashmap_remove (neighbours,
910 &n->id.hashPubKey, n));
912 // FIXME-ATS-API: we might want to be more specific about
913 // which states we do this from in the future (ATS should
914 // have given us a 'suggest_address' handle, and if we have
915 // such a handle, we should cancel the operation here!
916 GNUNET_ATS_suggest_address_cancel (GST_ats, &n->id);
918 if (GNUNET_SCHEDULER_NO_TASK != n->task)
920 GNUNET_SCHEDULER_cancel (n->task);
921 n->task = GNUNET_SCHEDULER_NO_TASK;
923 /* free rest of memory */
928 * Transmit a message using the current session of the given
931 * @param n entry for the recipient
932 * @param msgbuf buffer to transmit
933 * @param msgbuf_size number of bytes in buffer
934 * @param priority transmission priority
935 * @param timeout transmission timeout
936 * @param cont continuation to call when finished (can be NULL)
937 * @param cont_cls closure for cont
940 send_with_session (struct NeighbourMapEntry *n,
941 const char *msgbuf, size_t msgbuf_size,
943 struct GNUNET_TIME_Relative timeout,
944 GNUNET_TRANSPORT_TransmitContinuation cont,
947 struct GNUNET_TRANSPORT_PluginFunctions *papi;
949 GNUNET_assert (n->primary_address.session != NULL);
950 if ( ((NULL == (papi = GST_plugins_find (n->primary_address.address->transport_name)) ||
951 (-1 == papi->send (papi->cls,
952 n->primary_address.session,
956 cont, cont_cls)))) &&
958 cont (cont_cls, &n->id, GNUNET_SYSERR);
959 GNUNET_break (NULL != papi);
964 * Master task run for every neighbour. Performs all of the time-related
965 * activities (keep alive, send next message, disconnect if idle, finish
966 * clean up after disconnect).
968 * @param cls the 'struct NeighbourMapEntry' for which we are running
969 * @param tc scheduler context (unused)
972 master_task (void *cls,
973 const struct GNUNET_SCHEDULER_TaskContext *tc);
977 * Function called when the 'DISCONNECT' message has been sent by the
978 * plugin. Frees the neighbour --- if the entry still exists.
981 * @param target identity of the neighbour that was disconnected
982 * @param result GNUNET_OK if the disconnect got out successfully
985 send_disconnect_cont (void *cls, const struct GNUNET_PeerIdentity *target,
988 struct NeighbourMapEntry *n;
990 n = lookup_neighbour (target);
992 return; /* already gone */
993 if (S_DISCONNECT != n->state)
994 return; /* have created a fresh entry since */
995 n->state = S_DISCONNECT;
996 if (GNUNET_SCHEDULER_NO_TASK != n->task)
997 GNUNET_SCHEDULER_cancel (n->task);
998 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1003 * Transmit a DISCONNECT message to the other peer.
1005 * @param n neighbour to send DISCONNECT message.
1008 send_disconnect (struct NeighbourMapEntry *n)
1010 struct SessionDisconnectMessage disconnect_msg;
1012 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1013 "Sending DISCONNECT message to peer `%4s'\n",
1014 GNUNET_i2s (&n->id));
1015 disconnect_msg.header.size = htons (sizeof (struct SessionDisconnectMessage));
1016 disconnect_msg.header.type =
1017 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1018 disconnect_msg.reserved = htonl (0);
1019 disconnect_msg.purpose.size =
1020 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
1021 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
1022 sizeof (struct GNUNET_TIME_AbsoluteNBO));
1023 disconnect_msg.purpose.purpose =
1024 htonl (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1025 disconnect_msg.timestamp =
1026 GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1027 disconnect_msg.public_key = GST_my_public_key;
1028 GNUNET_assert (GNUNET_OK ==
1029 GNUNET_CRYPTO_rsa_sign (GST_my_private_key,
1030 &disconnect_msg.purpose,
1031 &disconnect_msg.signature));
1033 send_with_session (n,
1034 (const char *) &disconnect_msg, sizeof (disconnect_msg),
1035 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
1036 &send_disconnect_cont, NULL);
1037 GNUNET_STATISTICS_update (GST_stats,
1039 ("# DISCONNECT messages sent"), 1,
1045 * Disconnect from the given neighbour, clean up the record.
1047 * @param n neighbour to disconnect from
1050 disconnect_neighbour (struct NeighbourMapEntry *n)
1052 /* depending on state, notify neighbour and/or upper layers of this peer
1056 case S_NOT_CONNECTED:
1058 case S_INIT_BLACKLIST:
1059 /* other peer is completely unaware of us, no need to send DISCONNECT */
1060 n->state = S_DISCONNECT_FINISHED;
1061 free_neighbour (n, GNUNET_NO);
1063 case S_CONNECT_SENT:
1064 send_disconnect (n);
1065 n->state = S_DISCONNECT;
1067 case S_CONNECT_RECV_BLACKLIST_INBOUND:
1068 case S_CONNECT_RECV_ATS:
1069 case S_CONNECT_RECV_BLACKLIST:
1070 /* we never ACK'ed the other peer's request, no need to send DISCONNECT */
1071 n->state = S_DISCONNECT_FINISHED;
1072 free_neighbour (n, GNUNET_NO);
1074 case S_CONNECT_RECV_ACK:
1075 /* we DID ACK the other peer's request, must send DISCONNECT */
1076 send_disconnect (n);
1077 n->state = S_DISCONNECT;
1080 case S_RECONNECT_BLACKLIST:
1081 case S_RECONNECT_SENT:
1082 case S_CONNECTED_SWITCHING_BLACKLIST:
1083 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1084 /* we are currently connected, need to send disconnect and do
1085 internal notifications and update statistics */
1086 send_disconnect (n);
1087 GNUNET_STATISTICS_set (GST_stats,
1088 gettext_noop ("# peers connected"),
1089 --neighbours_connected,
1091 disconnect_notify_cb (callback_cls, &n->id);
1092 n->state = S_DISCONNECT;
1094 case S_RECONNECT_ATS:
1095 /* ATS address request timeout, disconnect without sending disconnect message */
1096 GNUNET_STATISTICS_set (GST_stats,
1097 gettext_noop ("# peers connected"),
1098 --neighbours_connected,
1100 disconnect_notify_cb (callback_cls, &n->id);
1101 n->state = S_DISCONNECT;
1104 /* already disconnected, ignore */
1106 case S_DISCONNECT_FINISHED:
1107 /* already cleaned up, how did we get here!? */
1111 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1115 /* schedule timeout to clean up */
1116 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1117 GNUNET_SCHEDULER_cancel (n->task);
1118 n->task = GNUNET_SCHEDULER_add_delayed (DISCONNECT_SENT_TIMEOUT,
1124 * We're done with our transmission attempt, continue processing.
1126 * @param cls the 'struct MessageQueue' of the message
1127 * @param receiver intended receiver
1128 * @param success whether it worked or not
1131 transmit_send_continuation (void *cls,
1132 const struct GNUNET_PeerIdentity *receiver,
1135 struct MessageQueue *mq = cls;
1136 struct NeighbourMapEntry *n;
1138 if (NULL == (n = lookup_neighbour (receiver)))
1141 return; /* disconnect or other error while transmitting, can happen */
1143 if (n->is_active == mq)
1145 /* this is still "our" neighbour, remove us from its queue
1146 and allow it to send the next message now */
1147 n->is_active = NULL;
1148 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1149 GNUNET_SCHEDULER_cancel (n->task);
1150 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1152 GNUNET_assert (bytes_in_send_queue >= mq->message_buf_size);
1153 bytes_in_send_queue -= mq->message_buf_size;
1154 GNUNET_STATISTICS_set (GST_stats,
1156 ("# bytes in message queue for other peers"),
1157 bytes_in_send_queue, GNUNET_NO);
1158 if (GNUNET_OK == success)
1159 GNUNET_STATISTICS_update (GST_stats,
1161 ("# messages transmitted to other peers"),
1164 GNUNET_STATISTICS_update (GST_stats,
1166 ("# transmission failures for messages to other peers"),
1168 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1169 "Sending message to `%s' of type %u was a %s\n",
1170 GNUNET_i2s (receiver),
1171 ntohs (((struct GNUNET_MessageHeader *) mq->message_buf)->type),
1172 (success == GNUNET_OK) ? "success" : "FAILURE");
1173 if (NULL != mq->cont)
1174 mq->cont (mq->cont_cls, success);
1180 * Check the message list for the given neighbour and if we can
1181 * send a message, do so. This function should only be called
1182 * if the connection is at least generally ready for transmission.
1183 * While we will only send one message at a time, no bandwidth
1184 * quota management is performed here. If a message was given to
1185 * the plugin, the continuation will automatically re-schedule
1186 * the 'master' task once the next message might be transmitted.
1188 * @param n target peer for which to transmit
1191 try_transmission_to_peer (struct NeighbourMapEntry *n)
1193 struct MessageQueue *mq;
1194 struct GNUNET_TIME_Relative timeout;
1196 if (NULL == n->primary_address.address)
1198 /* no address, why are we here? */
1202 if ((0 == n->primary_address.address->address_length) &&
1203 (NULL == n->primary_address.session))
1205 /* no address, why are we here? */
1209 if (NULL != n->is_active)
1211 /* transmission already pending */
1215 /* timeout messages from the queue that are past their due date */
1216 while (NULL != (mq = n->messages_head))
1218 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1219 if (timeout.rel_value > 0)
1221 GNUNET_STATISTICS_update (GST_stats,
1223 ("# messages timed out while in transport queue"),
1225 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
1227 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR); /* timeout */
1230 return; /* no more messages */
1231 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
1233 send_with_session (n,
1234 mq->message_buf, mq->message_buf_size,
1235 0 /* priority */, timeout,
1236 &transmit_send_continuation, mq);
1241 * Send keepalive message to the neighbour. Must only be called
1242 * if we are on 'connected' state or while trying to switch addresses.
1243 * Will internally determine if a keepalive is truly needed (so can
1244 * always be called).
1246 * @param n neighbour that went idle and needs a keepalive
1249 send_keepalive (struct NeighbourMapEntry *n)
1251 struct GNUNET_MessageHeader m;
1253 GNUNET_assert ((S_CONNECTED == n->state) ||
1254 (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
1255 (S_CONNECTED_SWITCHING_CONNECT_SENT));
1256 if (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time).rel_value > 0)
1257 return; /* no keepalive needed at this time */
1258 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1259 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE);
1260 send_with_session (n,
1261 (const void *) &m, sizeof (m),
1262 UINT32_MAX /* priority */,
1263 KEEPALIVE_FREQUENCY,
1265 GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# keepalives sent"), 1,
1267 n->expect_latency_response = GNUNET_YES;
1268 n->last_keep_alive_time = GNUNET_TIME_absolute_get ();
1269 n->keep_alive_time = GNUNET_TIME_relative_to_absolute (KEEPALIVE_FREQUENCY);
1274 * Keep the connection to the given neighbour alive longer,
1275 * we received a KEEPALIVE (or equivalent); send a response.
1277 * @param neighbour neighbour to keep alive (by sending keep alive response)
1280 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
1282 struct NeighbourMapEntry *n;
1283 struct GNUNET_MessageHeader m;
1285 if (NULL == (n = lookup_neighbour (neighbour)))
1287 GNUNET_STATISTICS_update (GST_stats,
1289 ("# KEEPALIVE messages discarded (peer unknown)"),
1293 if (NULL == n->primary_address.session)
1295 GNUNET_STATISTICS_update (GST_stats,
1297 ("# KEEPALIVE messages discarded (no session)"),
1301 /* send reply to allow neighbour to measure latency */
1302 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1303 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE_RESPONSE);
1304 send_with_session(n,
1305 (const void *) &m, sizeof (m),
1306 UINT32_MAX /* priority */,
1307 KEEPALIVE_FREQUENCY,
1313 * We received a KEEP_ALIVE_RESPONSE message and use this to calculate
1314 * latency to this peer. Pass the updated information (existing ats
1315 * plus calculated latency) to ATS.
1317 * @param neighbour neighbour to keep alive
1318 * @param ats performance data
1319 * @param ats_count number of entries in ats
1322 GST_neighbours_keepalive_response (const struct GNUNET_PeerIdentity *neighbour,
1323 const struct GNUNET_ATS_Information *ats,
1326 struct NeighbourMapEntry *n;
1328 struct GNUNET_ATS_Information ats_new[ats_count + 1];
1330 if (NULL == (n = lookup_neighbour (neighbour)))
1332 GNUNET_STATISTICS_update (GST_stats,
1334 ("# KEEPALIVE_RESPONSE messages discarded (not connected)"),
1338 if ( (S_CONNECTED != n->state) ||
1339 (GNUNET_YES != n->expect_latency_response) )
1341 GNUNET_STATISTICS_update (GST_stats,
1343 ("# KEEPALIVE_RESPONSE messages discarded (not expected)"),
1347 n->expect_latency_response = GNUNET_NO;
1348 n->latency = GNUNET_TIME_absolute_get_duration (n->last_keep_alive_time);
1349 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1350 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1351 "Latency for peer `%s' is %llu ms\n",
1352 GNUNET_i2s (&n->id), n->latency.rel_value);
1353 memcpy (ats_new, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1354 /* append latency */
1355 ats_new[ats_count].type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
1356 if (n->latency.rel_value > UINT32_MAX)
1357 latency = UINT32_MAX;
1359 latency = n->latency.rel_value;
1360 ats_new[ats_count].value = htonl (latency);
1361 GNUNET_ATS_address_update (GST_ats,
1362 n->primary_address.address,
1363 n->primary_address.session, ats_new,
1369 * We have received a message from the given sender. How long should
1370 * we delay before receiving more? (Also used to keep the peer marked
1373 * @param sender sender of the message
1374 * @param size size of the message
1375 * @param do_forward set to GNUNET_YES if the message should be forwarded to clients
1376 * GNUNET_NO if the neighbour is not connected or violates the quota,
1377 * GNUNET_SYSERR if the connection is not fully up yet
1378 * @return how long to wait before reading more from this sender
1380 struct GNUNET_TIME_Relative
1381 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
1382 *sender, ssize_t size, int *do_forward)
1384 struct NeighbourMapEntry *n;
1385 struct GNUNET_TIME_Relative ret;
1387 if (NULL == neighbours)
1389 *do_forward = GNUNET_NO;
1390 return GNUNET_TIME_UNIT_FOREVER_REL; /* This can happen during shutdown */
1392 if (NULL == (n = lookup_neighbour (sender)))
1394 GST_neighbours_try_connect (sender);
1395 if (NULL == (n = lookup_neighbour (sender)))
1397 GNUNET_STATISTICS_update (GST_stats,
1399 ("# messages discarded due to lack of neighbour record"),
1401 *do_forward = GNUNET_NO;
1402 return GNUNET_TIME_UNIT_ZERO;
1405 if (! test_connected (n))
1407 *do_forward = GNUNET_SYSERR;
1408 return GNUNET_TIME_UNIT_ZERO;
1410 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
1412 n->quota_violation_count++;
1413 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1414 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
1415 n->in_tracker.available_bytes_per_s__,
1416 n->quota_violation_count);
1417 /* Discount 32k per violation */
1418 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
1422 if (n->quota_violation_count > 0)
1424 /* try to add 32k back */
1425 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
1426 n->quota_violation_count--;
1429 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
1431 GNUNET_STATISTICS_update (GST_stats,
1433 ("# bandwidth quota violations by other peers"),
1435 *do_forward = GNUNET_NO;
1436 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
1438 *do_forward = GNUNET_YES;
1439 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 32 * 1024);
1440 if (ret.rel_value > 0)
1442 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1443 "Throttling read (%llu bytes excess at %u b/s), waiting %llu ms before reading more.\n",
1444 (unsigned long long) n->in_tracker.
1445 consumption_since_last_update__,
1446 (unsigned int) n->in_tracker.available_bytes_per_s__,
1447 (unsigned long long) ret.rel_value);
1448 GNUNET_STATISTICS_update (GST_stats,
1449 gettext_noop ("# ms throttling suggested"),
1450 (int64_t) ret.rel_value, GNUNET_NO);
1457 * Transmit a message to the given target using the active connection.
1459 * @param target destination
1460 * @param msg message to send
1461 * @param msg_size number of bytes in msg
1462 * @param timeout when to fail with timeout
1463 * @param cont function to call when done
1464 * @param cont_cls closure for 'cont'
1467 GST_neighbours_send (const struct GNUNET_PeerIdentity *target, const void *msg,
1468 size_t msg_size, struct GNUNET_TIME_Relative timeout,
1469 GST_NeighbourSendContinuation cont, void *cont_cls)
1471 struct NeighbourMapEntry *n;
1472 struct MessageQueue *mq;
1474 /* All ove these cases should never happen; they are all API violations.
1475 But we check anyway, just to be sure. */
1476 if (NULL == (n = lookup_neighbour (target)))
1480 cont (cont_cls, GNUNET_SYSERR);
1483 if (GNUNET_YES != test_connected (n))
1487 cont (cont_cls, GNUNET_SYSERR);
1490 bytes_in_send_queue += msg_size;
1491 GNUNET_STATISTICS_set (GST_stats,
1493 ("# bytes in message queue for other peers"),
1494 bytes_in_send_queue, GNUNET_NO);
1495 mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
1497 mq->cont_cls = cont_cls;
1498 memcpy (&mq[1], msg, msg_size);
1499 mq->message_buf = (const char *) &mq[1];
1500 mq->message_buf_size = msg_size;
1501 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1502 GNUNET_CONTAINER_DLL_insert_tail (n->messages_head, n->messages_tail, mq);
1503 if ( (NULL != n->is_active) ||
1504 ( (NULL == n->primary_address.session) && (NULL == n->primary_address.address)) )
1506 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1507 GNUNET_SCHEDULER_cancel (n->task);
1508 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1513 * Send a SESSION_CONNECT message via the given address.
1515 * @param na address to use
1518 send_session_connect (struct NeighbourAddress *na)
1520 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1521 struct SessionConnectMessage connect_msg;
1523 if (NULL == (papi = GST_plugins_find (na->address->transport_name)))
1528 if (NULL == na->session)
1529 na->session = papi->get_session (papi->cls, na->address);
1530 if (NULL == na->session)
1535 na->connect_timestamp = GNUNET_TIME_absolute_get ();
1536 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1537 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
1538 connect_msg.reserved = htonl (0);
1539 connect_msg.timestamp = GNUNET_TIME_absolute_hton (na->connect_timestamp);
1540 (void) papi->send (papi->cls,
1542 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1544 GNUNET_TIME_UNIT_FOREVER_REL,
1551 * Send a SESSION_CONNECT_ACK message via the given address.
1553 * @param address address to use
1554 * @param session session to use
1555 * @param timestamp timestamp to use for the ACK message
1558 send_session_connect_ack_message (const struct GNUNET_HELLO_Address *address,
1559 struct Session *session,
1560 struct GNUNET_TIME_Absolute timestamp)
1562 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1563 struct SessionConnectMessage connect_msg;
1565 if (NULL == (papi = GST_plugins_find (address->transport_name)))
1570 if (NULL == session)
1571 session = papi->get_session (papi->cls, address);
1572 if (NULL == session)
1577 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1578 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT_ACK);
1579 connect_msg.reserved = htonl (0);
1580 connect_msg.timestamp = GNUNET_TIME_absolute_hton (timestamp);
1581 (void) papi->send (papi->cls,
1583 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1585 GNUNET_TIME_UNIT_FOREVER_REL,
1592 * Create a fresh entry in the neighbour map for the given peer
1594 * @param peer peer to create an entry for
1595 * @return new neighbour map entry
1597 static struct NeighbourMapEntry *
1598 setup_neighbour (const struct GNUNET_PeerIdentity *peer)
1600 struct NeighbourMapEntry *n;
1602 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1603 "Creating new neighbour entry for `%s'\n",
1605 n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
1607 n->state = S_NOT_CONNECTED;
1608 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
1609 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
1610 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
1611 MAX_BANDWIDTH_CARRY_S);
1612 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1613 GNUNET_assert (GNUNET_OK ==
1614 GNUNET_CONTAINER_multihashmap_put (neighbours,
1615 &n->id.hashPubKey, n,
1616 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1622 * Check if the two given addresses are the same.
1623 * Actually only checks if the sessions are non-NULL
1624 * (which they should be) and then if they are identical;
1625 * the actual addresses don't matter if the session
1626 * pointers match anyway, and we must have session pointers
1629 * @param a1 first address to compare
1630 * @param a2 other address to compare
1631 * @return GNUNET_NO if the addresses do not match, GNUNET_YES if they do match
1634 address_matches (const struct NeighbourAddress *a1,
1635 const struct NeighbourAddress *a2)
1637 if ( (NULL == a1->session) ||
1638 (NULL == a2->session) )
1643 return (a1->session == a2->session) ? GNUNET_YES : GNUNET_NO;
1648 * Try to create a connection to the given target (eventually).
1650 * @param target peer to try to connect to
1653 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
1655 struct NeighbourMapEntry *n;
1657 if (NULL == neighbours)
1658 return; /* during shutdown, do nothing */
1659 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1660 "Asked to connect to peer `%s'\n",
1661 GNUNET_i2s (target));
1663 memcmp (target, &GST_my_identity, sizeof (struct GNUNET_PeerIdentity)))
1665 /* refuse to connect to myself */
1666 /* FIXME: can this happen? Is this not an API violation? */
1667 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1668 "Refusing to try to connect to myself.\n");
1671 n = lookup_neighbour (target);
1676 case S_NOT_CONNECTED:
1677 /* this should not be possible */
1679 free_neighbour (n, GNUNET_NO);
1682 case S_INIT_BLACKLIST:
1683 case S_CONNECT_SENT:
1684 case S_CONNECT_RECV_BLACKLIST_INBOUND:
1685 case S_CONNECT_RECV_ATS:
1686 case S_CONNECT_RECV_BLACKLIST:
1687 case S_CONNECT_RECV_ACK:
1688 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1689 "Ignoring request to try to connect to `%s', already trying!\n",
1690 GNUNET_i2s (target));
1691 return; /* already trying */
1693 case S_RECONNECT_ATS:
1694 case S_RECONNECT_BLACKLIST:
1695 case S_RECONNECT_SENT:
1696 case S_CONNECTED_SWITCHING_BLACKLIST:
1697 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1698 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1699 "Ignoring request to try to connect, already connected to `%s'!\n",
1700 GNUNET_i2s (target));
1701 return; /* already connected */
1703 /* get rid of remains, ready to re-try immediately */
1704 free_neighbour (n, GNUNET_NO);
1706 case S_DISCONNECT_FINISHED:
1707 /* should not be possible */
1710 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1712 free_neighbour (n, GNUNET_NO);
1716 n = setup_neighbour (target);
1717 n->state = S_INIT_ATS;
1718 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1720 GNUNET_ATS_reset_backoff (GST_ats, target);
1721 GNUNET_ATS_suggest_address (GST_ats, target);
1726 * Function called with the result of a blacklist check.
1728 * @param cls closure with the 'struct BlackListCheckContext'
1729 * @param peer peer this check affects
1730 * @param result GNUNET_OK if the address is allowed
1733 handle_test_blacklist_cont (void *cls,
1734 const struct GNUNET_PeerIdentity *peer,
1737 struct BlackListCheckContext *bcc = cls;
1738 struct NeighbourMapEntry *n;
1741 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1742 "Connection to new address of peer `%s' based on blacklist is `%s'\n",
1744 (GNUNET_OK == result) ? "allowed" : "FORBIDDEN");
1745 if (NULL == (n = lookup_neighbour (peer)))
1746 goto cleanup; /* nobody left to care about new address */
1749 case S_NOT_CONNECTED:
1750 /* this should not be possible */
1752 free_neighbour (n, GNUNET_NO);
1755 /* still waiting on ATS suggestion */
1757 case S_INIT_BLACKLIST:
1758 /* check if the address the blacklist was fine with matches
1759 ATS suggestion, if so, we can move on! */
1760 if ( (GNUNET_OK == result) &&
1761 (1 == n->send_connect_ack) )
1763 n->send_connect_ack = 2;
1764 send_session_connect_ack_message (bcc->na.address,
1766 n->connect_ack_timestamp);
1768 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1769 break; /* result for an address we currently don't care about */
1770 if (GNUNET_OK == result)
1772 n->timeout = GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT);
1773 n->state = S_CONNECT_SENT;
1774 send_session_connect (&n->primary_address);
1778 // FIXME: should also possibly destroy session with plugin!?
1779 GNUNET_ATS_address_destroyed (GST_ats,
1782 free_address (&n->primary_address);
1783 n->state = S_INIT_ATS;
1784 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1785 // FIXME: do we need to ask ATS again for suggestions?
1786 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1789 case S_CONNECT_SENT:
1790 /* waiting on CONNECT_ACK, send ACK if one is pending */
1791 if ( (GNUNET_OK == result) &&
1792 (1 == n->send_connect_ack) )
1794 n->send_connect_ack = 2;
1795 send_session_connect_ack_message (n->primary_address.address,
1796 n->primary_address.session,
1797 n->connect_ack_timestamp);
1800 case S_CONNECT_RECV_BLACKLIST_INBOUND:
1801 if (GNUNET_OK == result)
1803 /* valid new address, let ATS know! */
1804 GNUNET_ATS_address_add (GST_ats,
1807 bcc->ats, bcc->ats_count);
1809 n->state = S_CONNECT_RECV_ATS;
1810 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1811 GNUNET_ATS_reset_backoff (GST_ats, peer);
1812 GNUNET_ATS_suggest_address (GST_ats, peer);
1814 case S_CONNECT_RECV_ATS:
1815 /* still waiting on ATS suggestion, don't care about blacklist */
1817 case S_CONNECT_RECV_BLACKLIST:
1818 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1819 break; /* result for an address we currently don't care about */
1820 if (GNUNET_OK == result)
1822 n->timeout = GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT);
1823 n->state = S_CONNECT_RECV_ACK;
1824 send_session_connect_ack_message (bcc->na.address,
1826 n->connect_ack_timestamp);
1827 if (1 == n->send_connect_ack)
1828 n->send_connect_ack = 2;
1832 // FIXME: should also possibly destroy session with plugin!?
1833 GNUNET_ATS_address_destroyed (GST_ats,
1836 free_address (&n->primary_address);
1837 n->state = S_INIT_ATS;
1838 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1839 // FIXME: do we need to ask ATS again for suggestions?
1840 GNUNET_ATS_reset_backoff (GST_ats, peer);
1841 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1844 case S_CONNECT_RECV_ACK:
1845 /* waiting on SESSION_ACK, send ACK if one is pending */
1846 if ( (GNUNET_OK == result) &&
1847 (1 == n->send_connect_ack) )
1849 n->send_connect_ack = 2;
1850 send_session_connect_ack_message (n->primary_address.address,
1851 n->primary_address.session,
1852 n->connect_ack_timestamp);
1856 /* already connected, don't care about blacklist */
1858 case S_RECONNECT_ATS:
1859 /* still waiting on ATS suggestion, don't care about blacklist */
1861 case S_RECONNECT_BLACKLIST:
1862 if ( (GNUNET_OK == result) &&
1863 (1 == n->send_connect_ack) )
1865 n->send_connect_ack = 2;
1866 send_session_connect_ack_message (bcc->na.address,
1868 n->connect_ack_timestamp);
1870 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1871 break; /* result for an address we currently don't care about */
1872 if (GNUNET_OK == result)
1874 send_session_connect (&n->primary_address);
1875 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
1876 n->state = S_RECONNECT_SENT;
1880 GNUNET_ATS_address_destroyed (GST_ats,
1883 n->state = S_RECONNECT_ATS;
1884 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1885 // FIXME: do we need to ask ATS again for suggestions?
1886 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1889 case S_RECONNECT_SENT:
1890 /* waiting on CONNECT_ACK, don't care about blacklist */
1891 if ( (GNUNET_OK == result) &&
1892 (1 == n->send_connect_ack) )
1894 n->send_connect_ack = 2;
1895 send_session_connect_ack_message (n->primary_address.address,
1896 n->primary_address.session,
1897 n->connect_ack_timestamp);
1900 case S_CONNECTED_SWITCHING_BLACKLIST:
1901 if (GNUNET_YES != address_matches (&bcc->na, &n->alternative_address))
1902 break; /* result for an address we currently don't care about */
1903 if (GNUNET_OK == result)
1905 send_session_connect (&n->alternative_address);
1906 n->state = S_CONNECTED_SWITCHING_CONNECT_SENT;
1910 GNUNET_ATS_address_destroyed (GST_ats,
1913 free_address (&n->alternative_address);
1914 n->state = S_CONNECTED;
1917 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1918 /* waiting on CONNECT_ACK, don't care about blacklist */
1919 if ( (GNUNET_OK == result) &&
1920 (1 == n->send_connect_ack) )
1922 n->send_connect_ack = 2;
1923 send_session_connect_ack_message (n->primary_address.address,
1924 n->primary_address.session,
1925 n->connect_ack_timestamp);
1929 /* Nothing to do here, ATS will already do what can be done */
1931 case S_DISCONNECT_FINISHED:
1932 /* should not be possible */
1936 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1938 free_neighbour (n, GNUNET_NO);
1942 GNUNET_HELLO_address_free (bcc->na.address);
1943 GNUNET_CONTAINER_DLL_remove (bc_head,
1951 * We want to know if connecting to a particular peer via
1952 * a particular address is allowed. Check it!
1954 * @param peer identity of the peer to switch the address for
1955 * @param ts time at which the check was initiated
1956 * @param address address of the other peer, NULL if other peer
1958 * @param session session to use (or NULL)
1959 * @param ats performance data
1960 * @param ats_count number of entries in ats (excluding 0-termination)
1963 check_blacklist (const struct GNUNET_PeerIdentity *peer,
1964 struct GNUNET_TIME_Absolute ts,
1965 const struct GNUNET_HELLO_Address *address,
1966 struct Session *session,
1967 const struct GNUNET_ATS_Information *ats,
1970 struct BlackListCheckContext *bcc;
1971 struct GST_BlacklistCheck *bc;
1974 GNUNET_malloc (sizeof (struct BlackListCheckContext) +
1975 sizeof (struct GNUNET_ATS_Information) * ats_count);
1976 bcc->ats_count = ats_count;
1977 bcc->na.address = GNUNET_HELLO_address_copy (address);
1978 bcc->na.session = session;
1979 bcc->na.connect_timestamp = ts;
1980 bcc->ats = (struct GNUNET_ATS_Information *) &bcc[1];
1981 memcpy (bcc->ats, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1982 GNUNET_CONTAINER_DLL_insert (bc_head,
1985 if (NULL != (bc = GST_blacklist_test_allowed (peer,
1986 address->transport_name,
1987 &handle_test_blacklist_cont, bcc)))
1989 /* if NULL == bc, 'cont' was already called and 'bcc' already free'd, so
1990 we must only store 'bc' if 'bc' is non-NULL... */
1995 * We received a 'SESSION_CONNECT' message from the other peer.
1996 * Consider switching to it.
1998 * @param message possibly a 'struct SessionConnectMessage' (check format)
1999 * @param peer identity of the peer to switch the address for
2000 * @param address address of the other peer, NULL if other peer
2002 * @param session session to use (or NULL)
2003 * @param ats performance data
2004 * @param ats_count number of entries in ats (excluding 0-termination)
2007 GST_neighbours_handle_connect (const struct GNUNET_MessageHeader *message,
2008 const struct GNUNET_PeerIdentity *peer,
2009 const struct GNUNET_HELLO_Address *address,
2010 struct Session *session,
2011 const struct GNUNET_ATS_Information *ats,
2014 const struct SessionConnectMessage *scm;
2015 struct NeighbourMapEntry *n;
2016 struct GNUNET_TIME_Absolute ts;
2018 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2019 "Received CONNECT message from peer `%s'\n",
2022 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2024 GNUNET_break_op (0);
2027 if (NULL == neighbours)
2028 return; /* we're shutting down */
2029 scm = (const struct SessionConnectMessage *) message;
2030 GNUNET_break_op (0 == ntohl (scm->reserved));
2031 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2032 n = lookup_neighbour (peer);
2034 n = setup_neighbour (peer);
2035 n->send_connect_ack = 1;
2036 n->connect_ack_timestamp = ts;
2040 case S_NOT_CONNECTED:
2041 n->state = S_CONNECT_RECV_BLACKLIST_INBOUND;
2042 /* Do a blacklist check for the new address */
2043 check_blacklist (peer, ts, address, session, ats, ats_count);
2046 /* CONNECT message takes priority over us asking ATS for address */
2047 n->state = S_CONNECT_RECV_BLACKLIST_INBOUND;
2049 case S_INIT_BLACKLIST:
2050 case S_CONNECT_SENT:
2051 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2052 case S_CONNECT_RECV_ATS:
2053 case S_CONNECT_RECV_BLACKLIST:
2054 case S_CONNECT_RECV_ACK:
2055 /* It can never hurt to have an alternative address in the above cases,
2056 see if it is allowed */
2057 check_blacklist (peer, ts, address, session, ats, ats_count);
2060 /* we are already connected and can thus send the ACK immediately;
2061 still, it can never hurt to have an alternative address, so also
2062 tell ATS about it */
2063 GNUNET_assert (NULL != n->primary_address.address);
2064 GNUNET_assert (NULL != n->primary_address.session);
2065 n->send_connect_ack = 0;
2066 send_session_connect_ack_message (n->primary_address.address,
2067 n->primary_address.session, ts);
2068 check_blacklist (peer, ts, address, session, ats, ats_count);
2070 case S_RECONNECT_ATS:
2071 case S_RECONNECT_BLACKLIST:
2072 case S_RECONNECT_SENT:
2073 /* It can never hurt to have an alternative address in the above cases,
2074 see if it is allowed */
2075 check_blacklist (peer, ts, address, session, ats, ats_count);
2077 case S_CONNECTED_SWITCHING_BLACKLIST:
2078 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2079 /* we are already connected and can thus send the ACK immediately;
2080 still, it can never hurt to have an alternative address, so also
2081 tell ATS about it */
2082 GNUNET_assert (NULL != n->primary_address.address);
2083 GNUNET_assert (NULL != n->primary_address.session);
2084 n->send_connect_ack = 0;
2085 send_session_connect_ack_message (n->primary_address.address,
2086 n->primary_address.session, ts);
2087 check_blacklist (peer, ts, address, session, ats, ats_count);
2090 /* get rid of remains without terminating sessions, ready to re-try */
2091 free_neighbour (n, GNUNET_YES);
2092 n = setup_neighbour (peer);
2093 n->state = S_CONNECT_RECV_ATS;
2094 GNUNET_ATS_reset_backoff (GST_ats, peer);
2095 GNUNET_ATS_suggest_address (GST_ats, peer);
2097 case S_DISCONNECT_FINISHED:
2098 /* should not be possible */
2102 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2104 free_neighbour (n, GNUNET_NO);
2111 * For an existing neighbour record, set the active connection to
2112 * use the given address.
2114 * @param peer identity of the peer to switch the address for
2115 * @param address address of the other peer, NULL if other peer
2117 * @param session session to use (or NULL)
2118 * @param ats performance data
2119 * @param ats_count number of entries in ats
2120 * @param bandwidth_in inbound quota to be used when connection is up
2121 * @param bandwidth_out outbound quota to be used when connection is up
2124 GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
2125 const struct GNUNET_HELLO_Address *address,
2126 struct Session *session,
2127 const struct GNUNET_ATS_Information *ats,
2129 struct GNUNET_BANDWIDTH_Value32NBO
2131 struct GNUNET_BANDWIDTH_Value32NBO
2134 struct NeighbourMapEntry *n;
2135 struct GNUNET_TRANSPORT_PluginFunctions *papi;
2137 GNUNET_assert (address->transport_name != NULL);
2138 if (NULL == (n = lookup_neighbour (peer)))
2141 /* Obtain an session for this address from plugin */
2142 if (NULL == (papi = GST_plugins_find (address->transport_name)))
2144 /* we don't have the plugin for this address */
2145 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2148 if ((NULL == session) && (0 == address->address_length))
2151 if (strlen (address->transport_name) > 0)
2152 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2156 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2157 "ATS tells us to switch to address '%s' session %p for "
2158 "peer `%s' in state %s (quota in/out %u %u )\n",
2159 (address->address_length != 0) ? GST_plugins_a2s (address): "<inbound>",
2162 print_state (n->state),
2163 ntohl (bandwidth_in.value__),
2164 ntohl (bandwidth_out.value__));
2166 if (NULL == session)
2168 session = papi->get_session (papi->cls, address);
2169 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2170 "Obtained new session for peer `%s' and address '%s': %p\n",
2171 GNUNET_i2s (&address->peer), GST_plugins_a2s (address), session);
2173 if (NULL == session)
2175 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2176 "Failed to obtain new session for peer `%s' and address '%s'\n",
2177 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
2178 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2183 case S_NOT_CONNECTED:
2185 free_neighbour (n, GNUNET_NO);
2188 set_address (&n->primary_address,
2189 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2190 n->state = S_INIT_BLACKLIST;
2191 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2192 check_blacklist (&n->id,
2193 n->connect_ack_timestamp,
2194 address, session, ats, ats_count);
2196 case S_INIT_BLACKLIST:
2197 /* ATS suggests a different address, switch again */
2198 set_address (&n->primary_address,
2199 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2200 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2201 check_blacklist (&n->id,
2202 n->connect_ack_timestamp,
2203 address, session, ats, ats_count);
2205 case S_CONNECT_SENT:
2206 /* ATS suggests a different address, switch again */
2207 set_address (&n->primary_address,
2208 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2209 n->state = S_INIT_BLACKLIST;
2210 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2211 check_blacklist (&n->id,
2212 n->connect_ack_timestamp,
2213 address, session, ats, ats_count);
2215 case S_CONNECT_RECV_ATS:
2216 set_address (&n->primary_address,
2217 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2218 n->state = S_CONNECT_RECV_BLACKLIST;
2219 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2220 check_blacklist (&n->id,
2221 n->connect_ack_timestamp,
2222 address, session, ats, ats_count);
2224 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2225 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2226 check_blacklist (&n->id,
2227 n->connect_ack_timestamp,
2228 address, session, ats, ats_count);
2230 case S_CONNECT_RECV_BLACKLIST:
2231 case S_CONNECT_RECV_ACK:
2232 /* ATS asks us to switch while we were trying to connect; switch to new
2233 address and check blacklist again */
2234 set_address (&n->primary_address,
2235 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2236 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2237 check_blacklist (&n->id,
2238 n->connect_ack_timestamp,
2239 address, session, ats, ats_count);
2242 GNUNET_assert (NULL != n->primary_address.address);
2243 GNUNET_assert (NULL != n->primary_address.session);
2244 if (n->primary_address.session == session)
2246 /* not an address change, just a quota change */
2247 set_address (&n->primary_address,
2248 address, session, bandwidth_in, bandwidth_out, GNUNET_YES);
2251 /* ATS asks us to switch a life connection; see if we can get
2252 a CONNECT_ACK on it before we actually do this! */
2253 set_address (&n->alternative_address,
2254 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2255 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2256 check_blacklist (&n->id,
2257 GNUNET_TIME_absolute_get (),
2258 address, session, ats, ats_count);
2260 case S_RECONNECT_ATS:
2261 set_address (&n->primary_address,
2262 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2263 n->state = S_RECONNECT_BLACKLIST;
2264 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2265 check_blacklist (&n->id,
2266 n->connect_ack_timestamp,
2267 address, session, ats, ats_count);
2269 case S_RECONNECT_BLACKLIST:
2270 /* ATS asks us to switch while we were trying to reconnect; switch to new
2271 address and check blacklist again */
2272 set_address (&n->primary_address,
2273 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2274 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2275 check_blacklist (&n->id,
2276 n->connect_ack_timestamp,
2277 address, session, ats, ats_count);
2279 case S_RECONNECT_SENT:
2280 /* ATS asks us to switch while we were trying to reconnect; switch to new
2281 address and check blacklist again */
2282 set_address (&n->primary_address,
2283 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2284 n->state = S_RECONNECT_BLACKLIST;
2285 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2286 check_blacklist (&n->id,
2287 n->connect_ack_timestamp,
2288 address, session, ats, ats_count);
2290 case S_CONNECTED_SWITCHING_BLACKLIST:
2291 if (n->primary_address.session == session)
2293 /* ATS switches back to still-active session */
2294 free_address (&n->alternative_address);
2295 n->state = S_CONNECTED;
2298 /* ATS asks us to switch a life connection, update blacklist check */
2299 set_address (&n->alternative_address,
2300 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2301 check_blacklist (&n->id,
2302 GNUNET_TIME_absolute_get (),
2303 address, session, ats, ats_count);
2305 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2306 if (n->primary_address.session == session)
2308 /* ATS switches back to still-active session */
2309 free_address (&n->alternative_address);
2310 n->state = S_CONNECTED;
2313 /* ATS asks us to switch a life connection, update blacklist check */
2314 set_address (&n->alternative_address,
2315 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2316 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2317 check_blacklist (&n->id,
2318 GNUNET_TIME_absolute_get (),
2319 address, session, ats, ats_count);
2322 /* not going to switch addresses while disconnecting */
2324 case S_DISCONNECT_FINISHED:
2328 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2336 * Master task run for every neighbour. Performs all of the time-related
2337 * activities (keep alive, send next message, disconnect if idle, finish
2338 * clean up after disconnect).
2340 * @param cls the 'struct NeighbourMapEntry' for which we are running
2341 * @param tc scheduler context (unused)
2344 master_task (void *cls,
2345 const struct GNUNET_SCHEDULER_TaskContext *tc)
2347 struct NeighbourMapEntry *n = cls;
2348 struct GNUNET_TIME_Relative delay;
2350 n->task = GNUNET_SCHEDULER_NO_TASK;
2351 delay = GNUNET_TIME_absolute_get_remaining (n->timeout);
2352 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2353 "Master task runs for neighbour `%s' in state %s with timeout in %llu ms\n",
2354 GNUNET_i2s (&n->id),
2355 print_state(n->state),
2356 (unsigned long long) delay.rel_value);
2359 case S_NOT_CONNECTED:
2360 /* invalid state for master task, clean up */
2362 n->state = S_DISCONNECT_FINISHED;
2363 free_neighbour (n, GNUNET_NO);
2366 if (0 == delay.rel_value)
2368 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2369 "Connection to `%s' timed out waiting for ATS to provide address\n",
2370 GNUNET_i2s (&n->id));
2371 n->state = S_DISCONNECT_FINISHED;
2372 free_neighbour (n, GNUNET_NO);
2376 case S_INIT_BLACKLIST:
2377 if (0 == delay.rel_value)
2379 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2380 "Connection to `%s' timed out waiting for BLACKLIST to approve address\n",
2381 GNUNET_i2s (&n->id));
2382 n->state = S_DISCONNECT_FINISHED;
2383 free_neighbour (n, GNUNET_NO);
2387 case S_CONNECT_SENT:
2388 if (0 == delay.rel_value)
2390 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2391 "Connection to `%s' timed out waiting for other peer to send CONNECT_ACK\n",
2392 GNUNET_i2s (&n->id));
2393 disconnect_neighbour (n);
2397 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2398 if (0 == delay.rel_value)
2400 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2401 "Connection to `%s' timed out waiting BLACKLIST to approve address to use for received CONNECT\n",
2402 GNUNET_i2s (&n->id));
2403 n->state = S_DISCONNECT_FINISHED;
2404 free_neighbour (n, GNUNET_NO);
2408 case S_CONNECT_RECV_ATS:
2409 if (0 == delay.rel_value)
2411 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2412 "Connection to `%s' timed out waiting ATS to provide address to use for CONNECT_ACK\n",
2413 GNUNET_i2s (&n->id));
2414 n->state = S_DISCONNECT_FINISHED;
2415 free_neighbour (n, GNUNET_NO);
2419 case S_CONNECT_RECV_BLACKLIST:
2420 if (0 == delay.rel_value)
2422 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2423 "Connection to `%s' timed out waiting BLACKLIST to approve address to use for CONNECT_ACK\n",
2424 GNUNET_i2s (&n->id));
2425 n->state = S_DISCONNECT_FINISHED;
2426 free_neighbour (n, GNUNET_NO);
2430 case S_CONNECT_RECV_ACK:
2431 if (0 == delay.rel_value)
2433 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2434 "Connection to `%s' timed out waiting for other peer to send SESSION_ACK\n",
2435 GNUNET_i2s (&n->id));
2436 disconnect_neighbour (n);
2441 if (0 == delay.rel_value)
2443 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2444 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2445 GNUNET_i2s (&n->id));
2446 disconnect_neighbour (n);
2449 try_transmission_to_peer (n);
2452 case S_RECONNECT_ATS:
2453 if (0 == delay.rel_value)
2455 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2456 "Connection to `%s' timed out, waiting for ATS replacement address\n",
2457 GNUNET_i2s (&n->id));
2458 disconnect_neighbour (n);
2462 case S_RECONNECT_BLACKLIST:
2463 if (0 == delay.rel_value)
2465 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2466 "Connection to `%s' timed out, waiting for BLACKLIST to approve replacement address\n",
2467 GNUNET_i2s (&n->id));
2468 disconnect_neighbour (n);
2472 case S_RECONNECT_SENT:
2473 if (0 == delay.rel_value)
2475 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2476 "Connection to `%s' timed out, waiting for other peer to CONNECT_ACK replacement address\n",
2477 GNUNET_i2s (&n->id));
2478 disconnect_neighbour (n);
2482 case S_CONNECTED_SWITCHING_BLACKLIST:
2483 if (0 == delay.rel_value)
2485 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2486 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2487 GNUNET_i2s (&n->id));
2488 disconnect_neighbour (n);
2491 try_transmission_to_peer (n);
2494 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2495 if (0 == delay.rel_value)
2497 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2498 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs (after trying to CONNECT on alternative address)\n",
2499 GNUNET_i2s (&n->id));
2500 disconnect_neighbour (n);
2503 try_transmission_to_peer (n);
2507 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2508 "Cleaning up connection to `%s' after sending DISCONNECT\n",
2509 GNUNET_i2s (&n->id));
2510 free_neighbour (n, GNUNET_NO);
2512 case S_DISCONNECT_FINISHED:
2513 /* how did we get here!? */
2517 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2521 if ( (S_CONNECTED_SWITCHING_CONNECT_SENT == n->state) ||
2522 (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
2523 (S_CONNECTED == n->state) )
2525 /* if we are *now* in one of these three states, we're sending
2526 keep alive messages, so we need to consider the keepalive
2527 delay, not just the connection timeout */
2528 delay = GNUNET_TIME_relative_min (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time),
2531 if (GNUNET_SCHEDULER_NO_TASK == n->task)
2532 n->task = GNUNET_SCHEDULER_add_delayed (delay,
2539 * Send a SESSION_ACK message to the neighbour to confirm that we
2540 * got his CONNECT_ACK.
2542 * @param n neighbour to send the SESSION_ACK to
2545 send_session_ack_message (struct NeighbourMapEntry *n)
2547 struct GNUNET_MessageHeader msg;
2549 msg.size = htons (sizeof (struct GNUNET_MessageHeader));
2550 msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK);
2551 (void) send_with_session(n,
2552 (const char *) &msg, sizeof (struct GNUNET_MessageHeader),
2553 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
2559 * We received a 'SESSION_CONNECT_ACK' message from the other peer.
2560 * Consider switching to it.
2562 * @param message possibly a 'struct SessionConnectMessage' (check format)
2563 * @param peer identity of the peer to switch the address for
2564 * @param address address of the other peer, NULL if other peer
2566 * @param session session to use (or NULL)
2567 * @param ats performance data
2568 * @param ats_count number of entries in ats
2571 GST_neighbours_handle_connect_ack (const struct GNUNET_MessageHeader *message,
2572 const struct GNUNET_PeerIdentity *peer,
2573 const struct GNUNET_HELLO_Address *address,
2574 struct Session *session,
2575 const struct GNUNET_ATS_Information *ats,
2578 const struct SessionConnectMessage *scm;
2579 struct GNUNET_TIME_Absolute ts;
2580 struct NeighbourMapEntry *n;
2582 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2583 "Received CONNECT_ACK message from peer `%s'\n",
2586 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2588 GNUNET_break_op (0);
2591 scm = (const struct SessionConnectMessage *) message;
2592 GNUNET_break_op (ntohl (scm->reserved) == 0);
2593 if (NULL == (n = lookup_neighbour (peer)))
2595 GNUNET_STATISTICS_update (GST_stats,
2597 ("# unexpected CONNECT_ACK messages (no peer)"),
2601 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2604 case S_NOT_CONNECTED:
2606 free_neighbour (n, GNUNET_NO);
2609 case S_INIT_BLACKLIST:
2610 GNUNET_STATISTICS_update (GST_stats,
2612 ("# unexpected CONNECT_ACK messages (not ready)"),
2615 case S_CONNECT_SENT:
2616 if (ts.abs_value != n->primary_address.connect_timestamp.abs_value)
2617 break; /* ACK does not match our original CONNECT message */
2618 n->state = S_CONNECTED;
2619 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2620 GNUNET_STATISTICS_set (GST_stats,
2621 gettext_noop ("# peers connected"),
2622 ++neighbours_connected,
2624 connect_notify_cb (callback_cls, &n->id, ats, ats_count,
2625 n->primary_address.bandwidth_in,
2626 n->primary_address.bandwidth_out);
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 n->primary_address.bandwidth_in,
2888 n->primary_address.bandwidth_out);
2889 GNUNET_ATS_address_add(GST_ats,
2890 n->primary_address.address,
2891 n->primary_address.session,
2893 set_address (&n->primary_address,
2894 n->primary_address.address,
2895 n->primary_address.session,
2896 n->primary_address.bandwidth_in,
2897 n->primary_address.bandwidth_out,
2903 * Test if we're connected to the given peer.
2905 * @param target peer to test
2906 * @return GNUNET_YES if we are connected, GNUNET_NO if not
2909 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
2911 return test_connected (lookup_neighbour (target));
2916 * Change the incoming quota for the given peer.
2918 * @param neighbour identity of peer to change qutoa for
2919 * @param quota new quota
2922 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
2923 struct GNUNET_BANDWIDTH_Value32NBO quota)
2925 struct NeighbourMapEntry *n;
2927 if (NULL == (n = lookup_neighbour (neighbour)))
2929 GNUNET_STATISTICS_update (GST_stats,
2931 ("# SET QUOTA messages ignored (no such peer)"),
2935 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2936 "Setting inbound quota of %u Bps for peer `%s' to all clients\n",
2937 ntohl (quota.value__), GNUNET_i2s (&n->id));
2938 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
2939 if (0 != ntohl (quota.value__))
2941 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
2942 GNUNET_i2s (&n->id), "SET_QUOTA");
2943 if (GNUNET_YES == test_connected (n))
2944 GNUNET_STATISTICS_update (GST_stats,
2945 gettext_noop ("# disconnects due to quota of 0"),
2947 disconnect_neighbour (n);
2952 * We received a disconnect message from the given peer,
2953 * validate and process.
2955 * @param peer sender of the message
2956 * @param msg the disconnect message
2959 GST_neighbours_handle_disconnect_message (const struct GNUNET_PeerIdentity
2961 const struct GNUNET_MessageHeader
2964 struct NeighbourMapEntry *n;
2965 const struct SessionDisconnectMessage *sdm;
2966 struct GNUNET_HashCode hc;
2968 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2969 "Received DISCONNECT message from peer `%s'\n",
2971 if (ntohs (msg->size) != sizeof (struct SessionDisconnectMessage))
2973 // GNUNET_break_op (0);
2974 GNUNET_STATISTICS_update (GST_stats,
2976 ("# disconnect messages ignored (old format)"), 1,
2980 sdm = (const struct SessionDisconnectMessage *) msg;
2981 if (NULL == (n = lookup_neighbour (peer)))
2982 return; /* gone already */
2983 if (GNUNET_TIME_absolute_ntoh (sdm->timestamp).abs_value <= n->connect_ack_timestamp.abs_value)
2985 GNUNET_STATISTICS_update (GST_stats,
2987 ("# disconnect messages ignored (timestamp)"), 1,
2991 GNUNET_CRYPTO_hash (&sdm->public_key,
2992 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2994 if (0 != memcmp (peer, &hc, sizeof (struct GNUNET_PeerIdentity)))
2996 GNUNET_break_op (0);
2999 if (ntohl (sdm->purpose.size) !=
3000 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3001 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
3002 sizeof (struct GNUNET_TIME_AbsoluteNBO))
3004 GNUNET_break_op (0);
3008 GNUNET_CRYPTO_rsa_verify
3009 (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT, &sdm->purpose,
3010 &sdm->signature, &sdm->public_key))
3012 GNUNET_break_op (0);
3015 if (GNUNET_YES == test_connected (n))
3016 GNUNET_STATISTICS_update (GST_stats,
3018 ("# other peer asked to disconnect from us"), 1,
3020 disconnect_neighbour (n);
3025 * Closure for the neighbours_iterate function.
3027 struct IteratorContext
3030 * Function to call on each connected neighbour.
3032 GST_NeighbourIterator cb;
3042 * Call the callback from the closure for each connected neighbour.
3044 * @param cls the 'struct IteratorContext'
3045 * @param key the hash of the public key of the neighbour
3046 * @param value the 'struct NeighbourMapEntry'
3047 * @return GNUNET_OK (continue to iterate)
3050 neighbours_iterate (void *cls, const struct GNUNET_HashCode * key, void *value)
3052 struct IteratorContext *ic = cls;
3053 struct NeighbourMapEntry *n = value;
3055 if (GNUNET_YES == test_connected (n))
3057 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in;
3058 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out;
3060 if (NULL != n->primary_address.address)
3062 bandwidth_in = n->primary_address.bandwidth_in;
3063 bandwidth_out = n->primary_address.bandwidth_out;
3067 bandwidth_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
3068 bandwidth_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
3071 ic->cb (ic->cb_cls, &n->id, NULL, 0,
3072 n->primary_address.address,
3073 bandwidth_in, bandwidth_out);
3080 * Iterate over all connected neighbours.
3082 * @param cb function to call
3083 * @param cb_cls closure for cb
3086 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
3088 struct IteratorContext ic;
3090 if (NULL == neighbours)
3091 return; /* can happen during shutdown */
3094 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
3099 * If we have an active connection to the given target, it must be shutdown.
3101 * @param target peer to disconnect from
3104 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
3106 struct NeighbourMapEntry *n;
3108 if (NULL == (n = lookup_neighbour (target)))
3109 return; /* not active */
3110 if (GNUNET_YES == test_connected (n))
3111 GNUNET_STATISTICS_update (GST_stats,
3113 ("# disconnected from peer upon explicit request"), 1,
3115 disconnect_neighbour (n);
3120 * Obtain current latency information for the given neighbour.
3122 * @param peer to get the latency for
3123 * @return observed latency of the address, FOREVER if the
3124 * the connection is not up
3126 struct GNUNET_TIME_Relative
3127 GST_neighbour_get_latency (const struct GNUNET_PeerIdentity *peer)
3129 struct NeighbourMapEntry *n;
3131 n = lookup_neighbour (peer);
3133 return GNUNET_TIME_UNIT_FOREVER_REL;
3137 case S_CONNECTED_SWITCHING_CONNECT_SENT:
3138 case S_CONNECTED_SWITCHING_BLACKLIST:
3139 case S_RECONNECT_SENT:
3140 case S_RECONNECT_ATS:
3141 case S_RECONNECT_BLACKLIST:
3143 case S_NOT_CONNECTED:
3144 case S_INIT_BLACKLIST:
3146 case S_CONNECT_RECV_BLACKLIST_INBOUND:
3147 case S_CONNECT_RECV_ATS:
3148 case S_CONNECT_RECV_BLACKLIST:
3149 case S_CONNECT_RECV_ACK:
3150 case S_CONNECT_SENT:
3152 case S_DISCONNECT_FINISHED:
3153 return GNUNET_TIME_UNIT_FOREVER_REL;
3155 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
3159 return GNUNET_TIME_UNIT_FOREVER_REL;
3164 * Obtain current address information for the given neighbour.
3167 * @return address currently used
3169 struct GNUNET_HELLO_Address *
3170 GST_neighbour_get_current_address (const struct GNUNET_PeerIdentity *peer)
3172 struct NeighbourMapEntry *n;
3174 n = lookup_neighbour (peer);
3177 return n->primary_address.address;
3182 * Initialize the neighbours subsystem.
3184 * @param cls closure for callbacks
3185 * @param connect_cb function to call if we connect to a peer
3186 * @param disconnect_cb function to call if we disconnect from a peer
3187 * @param peer_address_cb function to call if we change an active address
3191 GST_neighbours_start (void *cls,
3192 NotifyConnect connect_cb,
3193 GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb,
3194 GNUNET_TRANSPORT_PeerIterateCallback peer_address_cb)
3197 connect_notify_cb = connect_cb;
3198 disconnect_notify_cb = disconnect_cb;
3199 address_change_cb = peer_address_cb;
3200 neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE, GNUNET_NO);
3205 * Disconnect from the given neighbour.
3208 * @param key hash of neighbour's public key (not used)
3209 * @param value the 'struct NeighbourMapEntry' of the neighbour
3210 * @return GNUNET_OK (continue to iterate)
3213 disconnect_all_neighbours (void *cls, const struct GNUNET_HashCode * key, void *value)
3215 struct NeighbourMapEntry *n = value;
3217 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3218 "Disconnecting peer `%4s', %s\n",
3219 GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
3220 n->state = S_DISCONNECT_FINISHED;
3221 free_neighbour (n, GNUNET_NO);
3227 * Cleanup the neighbours subsystem.
3230 GST_neighbours_stop ()
3232 if (NULL == neighbours)
3234 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
3235 &disconnect_all_neighbours,
3237 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
3239 callback_cls = NULL;
3240 connect_notify_cb = NULL;
3241 disconnect_notify_cb = NULL;
3242 address_change_cb = NULL;
3246 /* end of file gnunet-service-transport_neighbours.c */