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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 *old_address;
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);
897 /* cut transport-level connection */
898 //old_address = GNUNET_HELLO_address_copy(n->primary_address.address);
902 /* FIXME-PLUGIN-API: This does not seem to guarantee that all
903 transport sessions eventually get killed due to inactivity; they
904 MUST have their own timeout logic (but at least TCP doesn't have
905 one yet). Are we sure that EVERY 'session' of a plugin is
906 actually cleaned up this way!? Note that if we are switching
907 between two TCP sessions to the same peer, the existing plugin
908 API gives us not even the means to selectively kill only one of
909 them! Killing all sessions like this seems to be very, very
912 if ((GNUNET_NO == keep_sessions) &&
913 (NULL != n->primary_address.address) &&
914 (NULL != (papi = GST_plugins_find (n->primary_address.address->transport_name))))
915 papi->disconnect (papi->cls, &n->id);
918 n->state = S_DISCONNECT_FINISHED;
920 free_address (&n->primary_address);
921 free_address (&n->alternative_address);
923 GNUNET_assert (GNUNET_YES ==
924 GNUNET_CONTAINER_multihashmap_remove (neighbours,
925 &n->id.hashPubKey, n));
927 // FIXME-ATS-API: we might want to be more specific about
928 // which states we do this from in the future (ATS should
929 // have given us a 'suggest_address' handle, and if we have
930 // such a handle, we should cancel the operation here!
931 GNUNET_ATS_suggest_address_cancel (GST_ats, &n->id);
933 if (GNUNET_SCHEDULER_NO_TASK != n->task)
935 GNUNET_SCHEDULER_cancel (n->task);
936 n->task = GNUNET_SCHEDULER_NO_TASK;
938 /* free rest of memory */
944 * Transmit a message using the current session of the given
947 * @param n entry for the recipient
948 * @param msgbuf buffer to transmit
949 * @param msgbuf_size number of bytes in buffer
950 * @param priority transmission priority
951 * @param timeout transmission timeout
952 * @param cont continuation to call when finished (can be NULL)
953 * @param cont_cls closure for cont
956 send_with_session (struct NeighbourMapEntry *n,
957 const char *msgbuf, size_t msgbuf_size,
959 struct GNUNET_TIME_Relative timeout,
960 GNUNET_TRANSPORT_TransmitContinuation cont,
963 struct GNUNET_TRANSPORT_PluginFunctions *papi;
965 GNUNET_assert (n->primary_address.session != NULL);
966 if ( ( (NULL == (papi = GST_plugins_find (n->primary_address.address->transport_name))) ||
967 (-1 == papi->send (papi->cls,
968 n->primary_address.session,
974 cont (cont_cls, &n->id, GNUNET_SYSERR);
975 GNUNET_break (NULL != papi);
980 * Master task run for every neighbour. Performs all of the time-related
981 * activities (keep alive, send next message, disconnect if idle, finish
982 * clean up after disconnect).
984 * @param cls the 'struct NeighbourMapEntry' for which we are running
985 * @param tc scheduler context (unused)
988 master_task (void *cls,
989 const struct GNUNET_SCHEDULER_TaskContext *tc);
993 * Function called when the 'DISCONNECT' message has been sent by the
994 * plugin. Frees the neighbour --- if the entry still exists.
997 * @param target identity of the neighbour that was disconnected
998 * @param result GNUNET_OK if the disconnect got out successfully
1001 send_disconnect_cont (void *cls, const struct GNUNET_PeerIdentity *target,
1004 struct NeighbourMapEntry *n;
1006 n = lookup_neighbour (target);
1008 return; /* already gone */
1009 if (S_DISCONNECT != n->state)
1010 return; /* have created a fresh entry since */
1011 n->state = S_DISCONNECT;
1012 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1013 GNUNET_SCHEDULER_cancel (n->task);
1014 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1019 * Transmit a DISCONNECT message to the other peer.
1021 * @param n neighbour to send DISCONNECT message.
1024 send_disconnect (struct NeighbourMapEntry *n)
1026 struct SessionDisconnectMessage disconnect_msg;
1028 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1029 "Sending DISCONNECT message to peer `%4s'\n",
1030 GNUNET_i2s (&n->id));
1031 disconnect_msg.header.size = htons (sizeof (struct SessionDisconnectMessage));
1032 disconnect_msg.header.type =
1033 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1034 disconnect_msg.reserved = htonl (0);
1035 disconnect_msg.purpose.size =
1036 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
1037 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
1038 sizeof (struct GNUNET_TIME_AbsoluteNBO));
1039 disconnect_msg.purpose.purpose =
1040 htonl (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1041 disconnect_msg.timestamp =
1042 GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1043 disconnect_msg.public_key = GST_my_public_key;
1044 GNUNET_assert (GNUNET_OK ==
1045 GNUNET_CRYPTO_rsa_sign (GST_my_private_key,
1046 &disconnect_msg.purpose,
1047 &disconnect_msg.signature));
1049 send_with_session (n,
1050 (const char *) &disconnect_msg, sizeof (disconnect_msg),
1051 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
1052 &send_disconnect_cont, NULL);
1053 GNUNET_STATISTICS_update (GST_stats,
1055 ("# DISCONNECT messages sent"), 1,
1061 * Disconnect from the given neighbour, clean up the record.
1063 * @param n neighbour to disconnect from
1066 disconnect_neighbour (struct NeighbourMapEntry *n)
1068 /* depending on state, notify neighbour and/or upper layers of this peer
1072 case S_NOT_CONNECTED:
1074 case S_INIT_BLACKLIST:
1075 /* other peer is completely unaware of us, no need to send DISCONNECT */
1076 n->state = S_DISCONNECT_FINISHED;
1077 free_neighbour (n, GNUNET_NO);
1079 case S_CONNECT_SENT:
1080 send_disconnect (n);
1081 n->state = S_DISCONNECT;
1083 case S_CONNECT_RECV_BLACKLIST_INBOUND:
1084 case S_CONNECT_RECV_ATS:
1085 case S_CONNECT_RECV_BLACKLIST:
1086 /* we never ACK'ed the other peer's request, no need to send DISCONNECT */
1087 n->state = S_DISCONNECT_FINISHED;
1088 free_neighbour (n, GNUNET_NO);
1090 case S_CONNECT_RECV_ACK:
1091 /* we DID ACK the other peer's request, must send DISCONNECT */
1092 send_disconnect (n);
1093 n->state = S_DISCONNECT;
1096 case S_RECONNECT_BLACKLIST:
1097 case S_RECONNECT_SENT:
1098 case S_CONNECTED_SWITCHING_BLACKLIST:
1099 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1100 /* we are currently connected, need to send disconnect and do
1101 internal notifications and update statistics */
1102 send_disconnect (n);
1103 GNUNET_STATISTICS_set (GST_stats,
1104 gettext_noop ("# peers connected"),
1105 --neighbours_connected,
1107 disconnect_notify_cb (callback_cls, &n->id);
1108 n->state = S_DISCONNECT;
1110 case S_RECONNECT_ATS:
1111 /* ATS address request timeout, disconnect without sending disconnect message */
1112 GNUNET_STATISTICS_set (GST_stats,
1113 gettext_noop ("# peers connected"),
1114 --neighbours_connected,
1116 disconnect_notify_cb (callback_cls, &n->id);
1117 n->state = S_DISCONNECT;
1120 /* already disconnected, ignore */
1122 case S_DISCONNECT_FINISHED:
1123 /* already cleaned up, how did we get here!? */
1127 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1131 /* schedule timeout to clean up */
1132 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1133 GNUNET_SCHEDULER_cancel (n->task);
1134 n->task = GNUNET_SCHEDULER_add_delayed (DISCONNECT_SENT_TIMEOUT,
1140 * We're done with our transmission attempt, continue processing.
1142 * @param cls the 'struct MessageQueue' of the message
1143 * @param receiver intended receiver
1144 * @param success whether it worked or not
1147 transmit_send_continuation (void *cls,
1148 const struct GNUNET_PeerIdentity *receiver,
1151 struct MessageQueue *mq = cls;
1152 struct NeighbourMapEntry *n;
1154 if (NULL == (n = lookup_neighbour (receiver)))
1157 return; /* disconnect or other error while transmitting, can happen */
1159 if (n->is_active == mq)
1161 /* this is still "our" neighbour, remove us from its queue
1162 and allow it to send the next message now */
1163 n->is_active = NULL;
1164 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1165 GNUNET_SCHEDULER_cancel (n->task);
1166 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1168 GNUNET_assert (bytes_in_send_queue >= mq->message_buf_size);
1169 bytes_in_send_queue -= mq->message_buf_size;
1170 GNUNET_STATISTICS_set (GST_stats,
1172 ("# bytes in message queue for other peers"),
1173 bytes_in_send_queue, GNUNET_NO);
1174 if (GNUNET_OK == success)
1175 GNUNET_STATISTICS_update (GST_stats,
1177 ("# messages transmitted to other peers"),
1180 GNUNET_STATISTICS_update (GST_stats,
1182 ("# transmission failures for messages to other peers"),
1184 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1185 "Sending message to `%s' of type %u was a %s\n",
1186 GNUNET_i2s (receiver),
1187 ntohs (((struct GNUNET_MessageHeader *) mq->message_buf)->type),
1188 (success == GNUNET_OK) ? "success" : "FAILURE");
1189 if (NULL != mq->cont)
1190 mq->cont (mq->cont_cls, success);
1196 * Check the message list for the given neighbour and if we can
1197 * send a message, do so. This function should only be called
1198 * if the connection is at least generally ready for transmission.
1199 * While we will only send one message at a time, no bandwidth
1200 * quota management is performed here. If a message was given to
1201 * the plugin, the continuation will automatically re-schedule
1202 * the 'master' task once the next message might be transmitted.
1204 * @param n target peer for which to transmit
1207 try_transmission_to_peer (struct NeighbourMapEntry *n)
1209 struct MessageQueue *mq;
1210 struct GNUNET_TIME_Relative timeout;
1212 if (NULL == n->primary_address.address)
1214 /* no address, why are we here? */
1218 if ((0 == n->primary_address.address->address_length) &&
1219 (NULL == n->primary_address.session))
1221 /* no address, why are we here? */
1225 if (NULL != n->is_active)
1227 /* transmission already pending */
1231 /* timeout messages from the queue that are past their due date */
1232 while (NULL != (mq = n->messages_head))
1234 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1235 if (timeout.rel_value > 0)
1237 GNUNET_STATISTICS_update (GST_stats,
1239 ("# messages timed out while in transport queue"),
1241 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
1243 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR); /* timeout */
1246 return; /* no more messages */
1247 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
1249 send_with_session (n,
1250 mq->message_buf, mq->message_buf_size,
1251 0 /* priority */, timeout,
1252 &transmit_send_continuation, mq);
1257 * Send keepalive message to the neighbour. Must only be called
1258 * if we are on 'connected' state or while trying to switch addresses.
1259 * Will internally determine if a keepalive is truly needed (so can
1260 * always be called).
1262 * @param n neighbour that went idle and needs a keepalive
1265 send_keepalive (struct NeighbourMapEntry *n)
1267 struct GNUNET_MessageHeader m;
1269 GNUNET_assert ((S_CONNECTED == n->state) ||
1270 (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
1271 (S_CONNECTED_SWITCHING_CONNECT_SENT));
1272 if (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time).rel_value > 0)
1273 return; /* no keepalive needed at this time */
1274 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1275 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE);
1276 send_with_session (n,
1277 (const void *) &m, sizeof (m),
1278 UINT32_MAX /* priority */,
1279 KEEPALIVE_FREQUENCY,
1281 GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# keepalives sent"), 1,
1283 n->expect_latency_response = GNUNET_YES;
1284 n->last_keep_alive_time = GNUNET_TIME_absolute_get ();
1285 n->keep_alive_time = GNUNET_TIME_relative_to_absolute (KEEPALIVE_FREQUENCY);
1290 * Keep the connection to the given neighbour alive longer,
1291 * we received a KEEPALIVE (or equivalent); send a response.
1293 * @param neighbour neighbour to keep alive (by sending keep alive response)
1296 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
1298 struct NeighbourMapEntry *n;
1299 struct GNUNET_MessageHeader m;
1301 if (NULL == (n = lookup_neighbour (neighbour)))
1303 GNUNET_STATISTICS_update (GST_stats,
1305 ("# KEEPALIVE messages discarded (peer unknown)"),
1309 if (NULL == n->primary_address.session)
1311 GNUNET_STATISTICS_update (GST_stats,
1313 ("# KEEPALIVE messages discarded (no session)"),
1317 /* send reply to allow neighbour to measure latency */
1318 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1319 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE_RESPONSE);
1320 send_with_session(n,
1321 (const void *) &m, sizeof (m),
1322 UINT32_MAX /* priority */,
1323 KEEPALIVE_FREQUENCY,
1329 * We received a KEEP_ALIVE_RESPONSE message and use this to calculate
1330 * latency to this peer. Pass the updated information (existing ats
1331 * plus calculated latency) to ATS.
1333 * @param neighbour neighbour to keep alive
1334 * @param ats performance data
1335 * @param ats_count number of entries in ats
1338 GST_neighbours_keepalive_response (const struct GNUNET_PeerIdentity *neighbour,
1339 const struct GNUNET_ATS_Information *ats,
1342 struct NeighbourMapEntry *n;
1344 struct GNUNET_ATS_Information ats_new[ats_count + 1];
1346 if (NULL == (n = lookup_neighbour (neighbour)))
1348 GNUNET_STATISTICS_update (GST_stats,
1350 ("# KEEPALIVE_RESPONSE messages discarded (not connected)"),
1354 if ( (S_CONNECTED != n->state) ||
1355 (GNUNET_YES != n->expect_latency_response) )
1357 GNUNET_STATISTICS_update (GST_stats,
1359 ("# KEEPALIVE_RESPONSE messages discarded (not expected)"),
1363 n->expect_latency_response = GNUNET_NO;
1364 n->latency = GNUNET_TIME_absolute_get_duration (n->last_keep_alive_time);
1365 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1366 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1367 "Latency for peer `%s' is %llu ms\n",
1368 GNUNET_i2s (&n->id), n->latency.rel_value);
1369 memcpy (ats_new, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1370 /* append latency */
1371 ats_new[ats_count].type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
1372 if (n->latency.rel_value > UINT32_MAX)
1373 latency = UINT32_MAX;
1375 latency = n->latency.rel_value;
1376 ats_new[ats_count].value = htonl (latency);
1377 GNUNET_ATS_address_update (GST_ats,
1378 n->primary_address.address,
1379 n->primary_address.session, ats_new,
1385 * We have received a message from the given sender. How long should
1386 * we delay before receiving more? (Also used to keep the peer marked
1389 * @param sender sender of the message
1390 * @param size size of the message
1391 * @param do_forward set to GNUNET_YES if the message should be forwarded to clients
1392 * GNUNET_NO if the neighbour is not connected or violates the quota,
1393 * GNUNET_SYSERR if the connection is not fully up yet
1394 * @return how long to wait before reading more from this sender
1396 struct GNUNET_TIME_Relative
1397 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
1398 *sender, ssize_t size, int *do_forward)
1400 struct NeighbourMapEntry *n;
1401 struct GNUNET_TIME_Relative ret;
1403 if (NULL == neighbours)
1405 *do_forward = GNUNET_NO;
1406 return GNUNET_TIME_UNIT_FOREVER_REL; /* This can happen during shutdown */
1408 if (NULL == (n = lookup_neighbour (sender)))
1410 GST_neighbours_try_connect (sender);
1411 if (NULL == (n = lookup_neighbour (sender)))
1413 GNUNET_STATISTICS_update (GST_stats,
1415 ("# messages discarded due to lack of neighbour record"),
1417 *do_forward = GNUNET_NO;
1418 return GNUNET_TIME_UNIT_ZERO;
1421 if (! test_connected (n))
1423 *do_forward = GNUNET_SYSERR;
1424 return GNUNET_TIME_UNIT_ZERO;
1426 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
1428 n->quota_violation_count++;
1429 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1430 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
1431 n->in_tracker.available_bytes_per_s__,
1432 n->quota_violation_count);
1433 /* Discount 32k per violation */
1434 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
1438 if (n->quota_violation_count > 0)
1440 /* try to add 32k back */
1441 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
1442 n->quota_violation_count--;
1445 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
1447 GNUNET_STATISTICS_update (GST_stats,
1449 ("# bandwidth quota violations by other peers"),
1451 *do_forward = GNUNET_NO;
1452 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
1454 *do_forward = GNUNET_YES;
1455 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 32 * 1024);
1456 if (ret.rel_value > 0)
1458 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1459 "Throttling read (%llu bytes excess at %u b/s), waiting %llu ms before reading more.\n",
1460 (unsigned long long) n->in_tracker.
1461 consumption_since_last_update__,
1462 (unsigned int) n->in_tracker.available_bytes_per_s__,
1463 (unsigned long long) ret.rel_value);
1464 GNUNET_STATISTICS_update (GST_stats,
1465 gettext_noop ("# ms throttling suggested"),
1466 (int64_t) ret.rel_value, GNUNET_NO);
1473 * Transmit a message to the given target using the active connection.
1475 * @param target destination
1476 * @param msg message to send
1477 * @param msg_size number of bytes in msg
1478 * @param timeout when to fail with timeout
1479 * @param cont function to call when done
1480 * @param cont_cls closure for 'cont'
1483 GST_neighbours_send (const struct GNUNET_PeerIdentity *target, const void *msg,
1484 size_t msg_size, struct GNUNET_TIME_Relative timeout,
1485 GST_NeighbourSendContinuation cont, void *cont_cls)
1487 struct NeighbourMapEntry *n;
1488 struct MessageQueue *mq;
1490 /* All ove these cases should never happen; they are all API violations.
1491 But we check anyway, just to be sure. */
1492 if (NULL == (n = lookup_neighbour (target)))
1496 cont (cont_cls, GNUNET_SYSERR);
1499 if (GNUNET_YES != test_connected (n))
1503 cont (cont_cls, GNUNET_SYSERR);
1506 bytes_in_send_queue += msg_size;
1507 GNUNET_STATISTICS_set (GST_stats,
1509 ("# bytes in message queue for other peers"),
1510 bytes_in_send_queue, GNUNET_NO);
1511 mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
1513 mq->cont_cls = cont_cls;
1514 memcpy (&mq[1], msg, msg_size);
1515 mq->message_buf = (const char *) &mq[1];
1516 mq->message_buf_size = msg_size;
1517 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1518 GNUNET_CONTAINER_DLL_insert_tail (n->messages_head, n->messages_tail, mq);
1519 if ( (NULL != n->is_active) ||
1520 ( (NULL == n->primary_address.session) && (NULL == n->primary_address.address)) )
1522 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1523 GNUNET_SCHEDULER_cancel (n->task);
1524 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1529 * Send a SESSION_CONNECT message via the given address.
1531 * @param na address to use
1534 send_session_connect (struct NeighbourAddress *na)
1536 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1537 struct SessionConnectMessage connect_msg;
1539 if (NULL == (papi = GST_plugins_find (na->address->transport_name)))
1544 if (NULL == na->session)
1545 na->session = papi->get_session (papi->cls, na->address);
1546 if (NULL == na->session)
1551 na->connect_timestamp = GNUNET_TIME_absolute_get ();
1552 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1553 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
1554 connect_msg.reserved = htonl (0);
1555 connect_msg.timestamp = GNUNET_TIME_absolute_hton (na->connect_timestamp);
1556 (void) papi->send (papi->cls,
1558 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1560 GNUNET_TIME_UNIT_FOREVER_REL,
1566 * Send a SESSION_CONNECT_ACK message via the given address.
1568 * @param address address to use
1569 * @param session session to use
1570 * @param timestamp timestamp to use for the ACK message
1573 send_session_connect_ack_message (const struct GNUNET_HELLO_Address *address,
1574 struct Session *session,
1575 struct GNUNET_TIME_Absolute timestamp)
1577 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1578 struct SessionConnectMessage connect_msg;
1580 if (NULL == (papi = GST_plugins_find (address->transport_name)))
1585 if (NULL == session)
1586 session = papi->get_session (papi->cls, address);
1587 if (NULL == session)
1592 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1593 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT_ACK);
1594 connect_msg.reserved = htonl (0);
1595 connect_msg.timestamp = GNUNET_TIME_absolute_hton (timestamp);
1596 (void) papi->send (papi->cls,
1598 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1600 GNUNET_TIME_UNIT_FOREVER_REL,
1606 * Create a fresh entry in the neighbour map for the given peer
1608 * @param peer peer to create an entry for
1609 * @return new neighbour map entry
1611 static struct NeighbourMapEntry *
1612 setup_neighbour (const struct GNUNET_PeerIdentity *peer)
1614 struct NeighbourMapEntry *n;
1616 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1617 "Creating new neighbour entry for `%s'\n",
1619 n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
1621 n->state = S_NOT_CONNECTED;
1622 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
1623 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
1624 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
1625 MAX_BANDWIDTH_CARRY_S);
1626 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1627 GNUNET_assert (GNUNET_OK ==
1628 GNUNET_CONTAINER_multihashmap_put (neighbours,
1629 &n->id.hashPubKey, n,
1630 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1636 * Check if the two given addresses are the same.
1637 * Actually only checks if the sessions are non-NULL
1638 * (which they should be) and then if they are identical;
1639 * the actual addresses don't matter if the session
1640 * pointers match anyway, and we must have session pointers
1643 * @param a1 first address to compare
1644 * @param a2 other address to compare
1645 * @return GNUNET_NO if the addresses do not match, GNUNET_YES if they do match
1648 address_matches (const struct NeighbourAddress *a1,
1649 const struct NeighbourAddress *a2)
1651 if ( (NULL == a1->session) ||
1652 (NULL == a2->session) )
1657 return (a1->session == a2->session) ? GNUNET_YES : GNUNET_NO;
1662 * Try to create a connection to the given target (eventually).
1664 * @param target peer to try to connect to
1667 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
1669 struct NeighbourMapEntry *n;
1671 if (NULL == neighbours)
1672 return; /* during shutdown, do nothing */
1673 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1674 "Asked to connect to peer `%s'\n",
1675 GNUNET_i2s (target));
1677 memcmp (target, &GST_my_identity, sizeof (struct GNUNET_PeerIdentity)))
1679 /* refuse to connect to myself */
1680 /* FIXME: can this happen? Is this not an API violation? */
1681 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1682 "Refusing to try to connect to myself.\n");
1685 n = lookup_neighbour (target);
1690 case S_NOT_CONNECTED:
1691 /* this should not be possible */
1693 free_neighbour (n, GNUNET_NO);
1696 case S_INIT_BLACKLIST:
1697 case S_CONNECT_SENT:
1698 case S_CONNECT_RECV_BLACKLIST_INBOUND:
1699 case S_CONNECT_RECV_ATS:
1700 case S_CONNECT_RECV_BLACKLIST:
1701 case S_CONNECT_RECV_ACK:
1702 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1703 "Ignoring request to try to connect to `%s', already trying!\n",
1704 GNUNET_i2s (target));
1705 return; /* already trying */
1707 case S_RECONNECT_ATS:
1708 case S_RECONNECT_BLACKLIST:
1709 case S_RECONNECT_SENT:
1710 case S_CONNECTED_SWITCHING_BLACKLIST:
1711 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1712 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1713 "Ignoring request to try to connect, already connected to `%s'!\n",
1714 GNUNET_i2s (target));
1715 return; /* already connected */
1717 /* get rid of remains, ready to re-try immediately */
1718 free_neighbour (n, GNUNET_NO);
1720 case S_DISCONNECT_FINISHED:
1721 /* should not be possible */
1724 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1726 free_neighbour (n, GNUNET_NO);
1730 n = setup_neighbour (target);
1731 n->state = S_INIT_ATS;
1732 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1734 GNUNET_ATS_reset_backoff (GST_ats, target);
1735 GNUNET_ATS_suggest_address (GST_ats, target);
1740 * Function called with the result of a blacklist check.
1742 * @param cls closure with the 'struct BlackListCheckContext'
1743 * @param peer peer this check affects
1744 * @param result GNUNET_OK if the address is allowed
1747 handle_test_blacklist_cont (void *cls,
1748 const struct GNUNET_PeerIdentity *peer,
1751 struct BlackListCheckContext *bcc = cls;
1752 struct NeighbourMapEntry *n;
1755 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1756 "Connection to new address of peer `%s' based on blacklist is `%s'\n",
1758 (GNUNET_OK == result) ? "allowed" : "FORBIDDEN");
1759 if (NULL == (n = lookup_neighbour (peer)))
1760 goto cleanup; /* nobody left to care about new address */
1763 case S_NOT_CONNECTED:
1764 /* this should not be possible */
1766 free_neighbour (n, GNUNET_NO);
1769 /* still waiting on ATS suggestion */
1771 case S_INIT_BLACKLIST:
1772 /* check if the address the blacklist was fine with matches
1773 ATS suggestion, if so, we can move on! */
1774 if ( (GNUNET_OK == result) &&
1775 (1 == n->send_connect_ack) )
1777 n->send_connect_ack = 2;
1778 send_session_connect_ack_message (bcc->na.address,
1780 n->connect_ack_timestamp);
1782 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1783 break; /* result for an address we currently don't care about */
1784 if (GNUNET_OK == result)
1786 n->timeout = GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT);
1787 n->state = S_CONNECT_SENT;
1788 send_session_connect (&n->primary_address);
1792 // FIXME: should also possibly destroy session with plugin!?
1793 GNUNET_ATS_address_destroyed (GST_ats,
1796 free_address (&n->primary_address);
1797 n->state = S_INIT_ATS;
1798 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1799 // FIXME: do we need to ask ATS again for suggestions?
1800 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1803 case S_CONNECT_SENT:
1804 /* waiting on CONNECT_ACK, send ACK if one is pending */
1805 if ( (GNUNET_OK == result) &&
1806 (1 == n->send_connect_ack) )
1808 n->send_connect_ack = 2;
1809 send_session_connect_ack_message (n->primary_address.address,
1810 n->primary_address.session,
1811 n->connect_ack_timestamp);
1814 case S_CONNECT_RECV_BLACKLIST_INBOUND:
1815 if (GNUNET_OK == result)
1817 /* valid new address, let ATS know! */
1818 GNUNET_ATS_address_add (GST_ats,
1821 bcc->ats, bcc->ats_count);
1823 n->state = S_CONNECT_RECV_ATS;
1824 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1825 GNUNET_ATS_reset_backoff (GST_ats, peer);
1826 GNUNET_ATS_suggest_address (GST_ats, peer);
1828 case S_CONNECT_RECV_ATS:
1829 /* still waiting on ATS suggestion, don't care about blacklist */
1831 case S_CONNECT_RECV_BLACKLIST:
1832 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1833 break; /* result for an address we currently don't care about */
1834 if (GNUNET_OK == result)
1836 n->timeout = GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT);
1837 n->state = S_CONNECT_RECV_ACK;
1838 send_session_connect_ack_message (bcc->na.address,
1840 n->connect_ack_timestamp);
1841 if (1 == n->send_connect_ack)
1842 n->send_connect_ack = 2;
1846 // FIXME: should also possibly destroy session with plugin!?
1847 GNUNET_ATS_address_destroyed (GST_ats,
1850 free_address (&n->primary_address);
1851 n->state = S_INIT_ATS;
1852 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1853 // FIXME: do we need to ask ATS again for suggestions?
1854 GNUNET_ATS_reset_backoff (GST_ats, peer);
1855 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1858 case S_CONNECT_RECV_ACK:
1859 /* waiting on SESSION_ACK, send ACK if one is pending */
1860 if ( (GNUNET_OK == result) &&
1861 (1 == n->send_connect_ack) )
1863 n->send_connect_ack = 2;
1864 send_session_connect_ack_message (n->primary_address.address,
1865 n->primary_address.session,
1866 n->connect_ack_timestamp);
1870 /* already connected, don't care about blacklist */
1872 case S_RECONNECT_ATS:
1873 /* still waiting on ATS suggestion, don't care about blacklist */
1875 case S_RECONNECT_BLACKLIST:
1876 if ( (GNUNET_OK == result) &&
1877 (1 == n->send_connect_ack) )
1879 n->send_connect_ack = 2;
1880 send_session_connect_ack_message (bcc->na.address,
1882 n->connect_ack_timestamp);
1884 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1885 break; /* result for an address we currently don't care about */
1886 if (GNUNET_OK == result)
1888 send_session_connect (&n->primary_address);
1889 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
1890 n->state = S_RECONNECT_SENT;
1894 GNUNET_ATS_address_destroyed (GST_ats,
1897 n->state = S_RECONNECT_ATS;
1898 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1899 // FIXME: do we need to ask ATS again for suggestions?
1900 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1903 case S_RECONNECT_SENT:
1904 /* waiting on CONNECT_ACK, don't care about blacklist */
1905 if ( (GNUNET_OK == result) &&
1906 (1 == n->send_connect_ack) )
1908 n->send_connect_ack = 2;
1909 send_session_connect_ack_message (n->primary_address.address,
1910 n->primary_address.session,
1911 n->connect_ack_timestamp);
1914 case S_CONNECTED_SWITCHING_BLACKLIST:
1915 if (GNUNET_YES != address_matches (&bcc->na, &n->alternative_address))
1916 break; /* result for an address we currently don't care about */
1917 if (GNUNET_OK == result)
1919 send_session_connect (&n->alternative_address);
1920 n->state = S_CONNECTED_SWITCHING_CONNECT_SENT;
1924 GNUNET_ATS_address_destroyed (GST_ats,
1927 free_address (&n->alternative_address);
1928 n->state = S_CONNECTED;
1931 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1932 /* waiting on CONNECT_ACK, don't care about blacklist */
1933 if ( (GNUNET_OK == result) &&
1934 (1 == n->send_connect_ack) )
1936 n->send_connect_ack = 2;
1937 send_session_connect_ack_message (n->primary_address.address,
1938 n->primary_address.session,
1939 n->connect_ack_timestamp);
1943 /* Nothing to do here, ATS will already do what can be done */
1945 case S_DISCONNECT_FINISHED:
1946 /* should not be possible */
1950 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1952 free_neighbour (n, GNUNET_NO);
1956 GNUNET_HELLO_address_free (bcc->na.address);
1957 GNUNET_CONTAINER_DLL_remove (bc_head,
1965 * We want to know if connecting to a particular peer via
1966 * a particular address is allowed. Check it!
1968 * @param peer identity of the peer to switch the address for
1969 * @param ts time at which the check was initiated
1970 * @param address address of the other peer, NULL if other peer
1972 * @param session session to use (or NULL)
1973 * @param ats performance data
1974 * @param ats_count number of entries in ats (excluding 0-termination)
1977 check_blacklist (const struct GNUNET_PeerIdentity *peer,
1978 struct GNUNET_TIME_Absolute ts,
1979 const struct GNUNET_HELLO_Address *address,
1980 struct Session *session,
1981 const struct GNUNET_ATS_Information *ats,
1984 struct BlackListCheckContext *bcc;
1985 struct GST_BlacklistCheck *bc;
1988 GNUNET_malloc (sizeof (struct BlackListCheckContext) +
1989 sizeof (struct GNUNET_ATS_Information) * ats_count);
1990 bcc->ats_count = ats_count;
1991 bcc->na.address = GNUNET_HELLO_address_copy (address);
1992 bcc->na.session = session;
1993 bcc->na.connect_timestamp = ts;
1994 bcc->ats = (struct GNUNET_ATS_Information *) &bcc[1];
1995 memcpy (bcc->ats, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1996 GNUNET_CONTAINER_DLL_insert (bc_head,
1999 if (NULL != (bc = GST_blacklist_test_allowed (peer,
2000 address->transport_name,
2001 &handle_test_blacklist_cont, bcc)))
2003 /* if NULL == bc, 'cont' was already called and 'bcc' already free'd, so
2004 we must only store 'bc' if 'bc' is non-NULL... */
2009 * We received a 'SESSION_CONNECT' message from the other peer.
2010 * Consider switching to it.
2012 * @param message possibly a 'struct SessionConnectMessage' (check format)
2013 * @param peer identity of the peer to switch the address for
2014 * @param address address of the other peer, NULL if other peer
2016 * @param session session to use (or NULL)
2017 * @param ats performance data
2018 * @param ats_count number of entries in ats (excluding 0-termination)
2021 GST_neighbours_handle_connect (const struct GNUNET_MessageHeader *message,
2022 const struct GNUNET_PeerIdentity *peer,
2023 const struct GNUNET_HELLO_Address *address,
2024 struct Session *session,
2025 const struct GNUNET_ATS_Information *ats,
2028 const struct SessionConnectMessage *scm;
2029 struct NeighbourMapEntry *n;
2030 struct GNUNET_TIME_Absolute ts;
2032 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2033 "Received CONNECT message from peer `%s'\n",
2036 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2038 GNUNET_break_op (0);
2041 if (NULL == neighbours)
2042 return; /* we're shutting down */
2043 scm = (const struct SessionConnectMessage *) message;
2044 GNUNET_break_op (0 == ntohl (scm->reserved));
2045 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2046 n = lookup_neighbour (peer);
2048 n = setup_neighbour (peer);
2049 n->send_connect_ack = 1;
2050 n->connect_ack_timestamp = ts;
2054 case S_NOT_CONNECTED:
2055 n->state = S_CONNECT_RECV_BLACKLIST_INBOUND;
2056 /* Do a blacklist check for the new address */
2057 check_blacklist (peer, ts, address, session, ats, ats_count);
2060 /* CONNECT message takes priority over us asking ATS for address */
2061 n->state = S_CONNECT_RECV_BLACKLIST_INBOUND;
2063 case S_INIT_BLACKLIST:
2064 case S_CONNECT_SENT:
2065 case S_CONNECT_RECV_ATS:
2066 case S_CONNECT_RECV_BLACKLIST:
2067 case S_CONNECT_RECV_ACK:
2068 /* It can never hurt to have an alternative address in the above cases,
2069 see if it is allowed */
2070 check_blacklist (peer, ts, address, session, ats, ats_count);
2073 /* we are already connected and can thus send the ACK immediately;
2074 still, it can never hurt to have an alternative address, so also
2075 tell ATS about it */
2076 GNUNET_assert (NULL != n->primary_address.address);
2077 GNUNET_assert (NULL != n->primary_address.session);
2078 n->send_connect_ack = 0;
2079 send_session_connect_ack_message (n->primary_address.address,
2080 n->primary_address.session, ts);
2081 check_blacklist (peer, ts, address, session, ats, ats_count);
2083 case S_RECONNECT_ATS:
2084 case S_RECONNECT_BLACKLIST:
2085 case S_RECONNECT_SENT:
2086 /* It can never hurt to have an alternative address in the above cases,
2087 see if it is allowed */
2088 check_blacklist (peer, ts, address, session, ats, ats_count);
2090 case S_CONNECTED_SWITCHING_BLACKLIST:
2091 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2092 /* we are already connected and can thus send the ACK immediately;
2093 still, it can never hurt to have an alternative address, so also
2094 tell ATS about it */
2095 GNUNET_assert (NULL != n->primary_address.address);
2096 GNUNET_assert (NULL != n->primary_address.session);
2097 n->send_connect_ack = 0;
2098 send_session_connect_ack_message (n->primary_address.address,
2099 n->primary_address.session, ts);
2100 check_blacklist (peer, ts, address, session, ats, ats_count);
2103 /* get rid of remains without terminating sessions, ready to re-try */
2104 free_neighbour (n, GNUNET_YES);
2105 n = setup_neighbour (peer);
2106 n->state = S_CONNECT_RECV_ATS;
2107 GNUNET_ATS_reset_backoff (GST_ats, peer);
2108 GNUNET_ATS_suggest_address (GST_ats, peer);
2110 case S_DISCONNECT_FINISHED:
2111 /* should not be possible */
2115 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2117 free_neighbour (n, GNUNET_NO);
2124 * For an existing neighbour record, set the active connection to
2125 * use the given address.
2127 * @param peer identity of the peer to switch the address for
2128 * @param address address of the other peer, NULL if other peer
2130 * @param session session to use (or NULL)
2131 * @param ats performance data
2132 * @param ats_count number of entries in ats
2133 * @param bandwidth_in inbound quota to be used when connection is up
2134 * @param bandwidth_out outbound quota to be used when connection is up
2137 GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
2138 const struct GNUNET_HELLO_Address *address,
2139 struct Session *session,
2140 const struct GNUNET_ATS_Information *ats,
2142 struct GNUNET_BANDWIDTH_Value32NBO
2144 struct GNUNET_BANDWIDTH_Value32NBO
2147 struct NeighbourMapEntry *n;
2148 struct GNUNET_TRANSPORT_PluginFunctions *papi;
2150 GNUNET_assert (address->transport_name != NULL);
2151 if (NULL == (n = lookup_neighbour (peer)))
2154 /* Obtain an session for this address from plugin */
2155 if (NULL == (papi = GST_plugins_find (address->transport_name)))
2157 /* we don't have the plugin for this address */
2158 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2161 if ((NULL == session) && (0 == address->address_length))
2164 if (strlen (address->transport_name) > 0)
2165 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2169 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2170 "ATS tells us to switch to address '%s' session %p for peer `%s' in state %s\n",
2171 (address->address_length != 0) ? GST_plugins_a2s (address): "<inbound>",
2174 print_state (n->state));
2176 if (NULL == session)
2178 session = papi->get_session (papi->cls, address);
2179 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2180 "Obtained new session for peer `%s' and address '%s': %p\n",
2181 GNUNET_i2s (&address->peer), GST_plugins_a2s (address), session);
2183 if (NULL == session)
2185 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2186 "Failed to obtain new session for peer `%s' and address '%s'\n",
2187 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
2188 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2193 case S_NOT_CONNECTED:
2195 free_neighbour (n, GNUNET_NO);
2198 set_address (&n->primary_address,
2199 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2200 n->state = S_INIT_BLACKLIST;
2201 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2202 check_blacklist (&n->id,
2203 n->connect_ack_timestamp,
2204 address, session, ats, ats_count);
2206 case S_INIT_BLACKLIST:
2207 /* ATS suggests a different address, switch again */
2208 set_address (&n->primary_address,
2209 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
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_SENT:
2216 /* ATS suggests a different address, switch again */
2217 set_address (&n->primary_address,
2218 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2219 n->state = S_INIT_BLACKLIST;
2220 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2221 check_blacklist (&n->id,
2222 n->connect_ack_timestamp,
2223 address, session, ats, ats_count);
2225 case S_CONNECT_RECV_ATS:
2226 set_address (&n->primary_address,
2227 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2228 n->state = S_CONNECT_RECV_BLACKLIST;
2229 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2230 check_blacklist (&n->id,
2231 n->connect_ack_timestamp,
2232 address, session, ats, ats_count);
2234 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2235 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2236 check_blacklist (&n->id,
2237 n->connect_ack_timestamp,
2238 address, session, ats, ats_count);
2240 case S_CONNECT_RECV_BLACKLIST:
2241 case S_CONNECT_RECV_ACK:
2242 /* ATS asks us to switch while we were trying to connect; switch to new
2243 address and check blacklist again */
2244 set_address (&n->primary_address,
2245 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2246 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2247 check_blacklist (&n->id,
2248 n->connect_ack_timestamp,
2249 address, session, ats, ats_count);
2252 GNUNET_assert (NULL != n->primary_address.address);
2253 GNUNET_assert (NULL != n->primary_address.session);
2254 if (n->primary_address.session == session)
2256 /* not an address change, just a quota change */
2257 set_address (&n->primary_address,
2258 address, session, bandwidth_in, bandwidth_out, GNUNET_YES);
2261 /* ATS asks us to switch a life connection; see if we can get
2262 a CONNECT_ACK on it before we actually do this! */
2263 set_address (&n->alternative_address,
2264 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2265 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2266 check_blacklist (&n->id,
2267 GNUNET_TIME_absolute_get (),
2268 address, session, ats, ats_count);
2270 case S_RECONNECT_ATS:
2271 set_address (&n->primary_address,
2272 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2273 n->state = S_RECONNECT_BLACKLIST;
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_BLACKLIST:
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->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2285 check_blacklist (&n->id,
2286 n->connect_ack_timestamp,
2287 address, session, ats, ats_count);
2289 case S_RECONNECT_SENT:
2290 /* ATS asks us to switch while we were trying to reconnect; switch to new
2291 address and check blacklist again */
2292 set_address (&n->primary_address,
2293 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2294 n->state = S_RECONNECT_BLACKLIST;
2295 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2296 check_blacklist (&n->id,
2297 n->connect_ack_timestamp,
2298 address, session, ats, ats_count);
2300 case S_CONNECTED_SWITCHING_BLACKLIST:
2301 if (n->primary_address.session == session)
2303 /* ATS switches back to still-active session */
2304 free_address (&n->alternative_address);
2305 n->state = S_CONNECTED;
2308 /* ATS asks us to switch a life connection, update blacklist check */
2309 set_address (&n->alternative_address,
2310 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2311 check_blacklist (&n->id,
2312 GNUNET_TIME_absolute_get (),
2313 address, session, ats, ats_count);
2315 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2316 if (n->primary_address.session == session)
2318 /* ATS switches back to still-active session */
2319 free_address (&n->alternative_address);
2320 n->state = S_CONNECTED;
2323 /* ATS asks us to switch a life connection, update blacklist check */
2324 set_address (&n->alternative_address,
2325 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2326 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2327 check_blacklist (&n->id,
2328 GNUNET_TIME_absolute_get (),
2329 address, session, ats, ats_count);
2332 /* not going to switch addresses while disconnecting */
2334 case S_DISCONNECT_FINISHED:
2338 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2346 * Master task run for every neighbour. Performs all of the time-related
2347 * activities (keep alive, send next message, disconnect if idle, finish
2348 * clean up after disconnect).
2350 * @param cls the 'struct NeighbourMapEntry' for which we are running
2351 * @param tc scheduler context (unused)
2354 master_task (void *cls,
2355 const struct GNUNET_SCHEDULER_TaskContext *tc)
2357 struct NeighbourMapEntry *n = cls;
2358 struct GNUNET_TIME_Relative delay;
2360 n->task = GNUNET_SCHEDULER_NO_TASK;
2361 delay = GNUNET_TIME_absolute_get_remaining (n->timeout);
2362 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2363 "Master task runs for neighbour `%s' in state %s with timeout in %llu ms\n",
2364 GNUNET_i2s (&n->id),
2365 print_state(n->state),
2366 (unsigned long long) delay.rel_value);
2369 case S_NOT_CONNECTED:
2370 /* invalid state for master task, clean up */
2372 n->state = S_DISCONNECT_FINISHED;
2373 free_neighbour (n, GNUNET_NO);
2376 if (0 == delay.rel_value)
2378 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2379 "Connection to `%s' timed out waiting for ATS to provide address\n",
2380 GNUNET_i2s (&n->id));
2381 n->state = S_DISCONNECT_FINISHED;
2382 free_neighbour (n, GNUNET_NO);
2386 case S_INIT_BLACKLIST:
2387 if (0 == delay.rel_value)
2389 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2390 "Connection to `%s' timed out waiting for BLACKLIST to approve address\n",
2391 GNUNET_i2s (&n->id));
2392 n->state = S_DISCONNECT_FINISHED;
2393 free_neighbour (n, GNUNET_NO);
2397 case S_CONNECT_SENT:
2398 if (0 == delay.rel_value)
2400 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2401 "Connection to `%s' timed out waiting for other peer to send CONNECT_ACK\n",
2402 GNUNET_i2s (&n->id));
2403 disconnect_neighbour (n);
2407 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2408 if (0 == delay.rel_value)
2410 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2411 "Connection to `%s' timed out waiting BLACKLIST to approve address to use for received CONNECT\n",
2412 GNUNET_i2s (&n->id));
2413 n->state = S_DISCONNECT_FINISHED;
2414 free_neighbour (n, GNUNET_NO);
2418 case S_CONNECT_RECV_ATS:
2419 if (0 == delay.rel_value)
2421 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2422 "Connection to `%s' timed out waiting ATS to provide address to use for CONNECT_ACK\n",
2423 GNUNET_i2s (&n->id));
2424 n->state = S_DISCONNECT_FINISHED;
2425 free_neighbour (n, GNUNET_NO);
2429 case S_CONNECT_RECV_BLACKLIST:
2430 if (0 == delay.rel_value)
2432 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2433 "Connection to `%s' timed out waiting BLACKLIST to approve address to use for CONNECT_ACK\n",
2434 GNUNET_i2s (&n->id));
2435 n->state = S_DISCONNECT_FINISHED;
2436 free_neighbour (n, GNUNET_NO);
2440 case S_CONNECT_RECV_ACK:
2441 if (0 == delay.rel_value)
2443 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2444 "Connection to `%s' timed out waiting for other peer to send SESSION_ACK\n",
2445 GNUNET_i2s (&n->id));
2446 disconnect_neighbour (n);
2451 if (0 == delay.rel_value)
2453 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2454 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2455 GNUNET_i2s (&n->id));
2456 disconnect_neighbour (n);
2459 try_transmission_to_peer (n);
2462 case S_RECONNECT_ATS:
2463 if (0 == delay.rel_value)
2465 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2466 "Connection to `%s' timed out, waiting for ATS replacement address\n",
2467 GNUNET_i2s (&n->id));
2468 disconnect_neighbour (n);
2472 case S_RECONNECT_BLACKLIST:
2473 if (0 == delay.rel_value)
2475 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2476 "Connection to `%s' timed out, waiting for BLACKLIST to approve replacement address\n",
2477 GNUNET_i2s (&n->id));
2478 disconnect_neighbour (n);
2482 case S_RECONNECT_SENT:
2483 if (0 == delay.rel_value)
2485 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2486 "Connection to `%s' timed out, waiting for other peer to CONNECT_ACK replacement address\n",
2487 GNUNET_i2s (&n->id));
2488 disconnect_neighbour (n);
2492 case S_CONNECTED_SWITCHING_BLACKLIST:
2493 if (0 == delay.rel_value)
2495 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2496 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2497 GNUNET_i2s (&n->id));
2498 disconnect_neighbour (n);
2501 try_transmission_to_peer (n);
2504 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2505 if (0 == delay.rel_value)
2507 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2508 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs (after trying to CONNECT on alternative address)\n",
2509 GNUNET_i2s (&n->id));
2510 disconnect_neighbour (n);
2513 try_transmission_to_peer (n);
2517 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2518 "Cleaning up connection to `%s' after sending DISCONNECT\n",
2519 GNUNET_i2s (&n->id));
2520 free_neighbour (n, GNUNET_NO);
2522 case S_DISCONNECT_FINISHED:
2523 /* how did we get here!? */
2527 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2531 if ( (S_CONNECTED_SWITCHING_CONNECT_SENT == n->state) ||
2532 (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
2533 (S_CONNECTED == n->state) )
2535 /* if we are *now* in one of these three states, we're sending
2536 keep alive messages, so we need to consider the keepalive
2537 delay, not just the connection timeout */
2538 delay = GNUNET_TIME_relative_min (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time),
2541 if (GNUNET_SCHEDULER_NO_TASK == n->task)
2542 n->task = GNUNET_SCHEDULER_add_delayed (delay,
2549 * Send a SESSION_ACK message to the neighbour to confirm that we
2550 * got his CONNECT_ACK.
2552 * @param n neighbour to send the SESSION_ACK to
2555 send_session_ack_message (struct NeighbourMapEntry *n)
2557 struct GNUNET_MessageHeader msg;
2559 msg.size = htons (sizeof (struct GNUNET_MessageHeader));
2560 msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK);
2561 (void) send_with_session(n,
2562 (const char *) &msg, sizeof (struct GNUNET_MessageHeader),
2563 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
2569 * We received a 'SESSION_CONNECT_ACK' message from the other peer.
2570 * Consider switching to it.
2572 * @param message possibly a 'struct SessionConnectMessage' (check format)
2573 * @param peer identity of the peer to switch the address for
2574 * @param address address of the other peer, NULL if other peer
2576 * @param session session to use (or NULL)
2577 * @param ats performance data
2578 * @param ats_count number of entries in ats
2581 GST_neighbours_handle_connect_ack (const struct GNUNET_MessageHeader *message,
2582 const struct GNUNET_PeerIdentity *peer,
2583 const struct GNUNET_HELLO_Address *address,
2584 struct Session *session,
2585 const struct GNUNET_ATS_Information *ats,
2588 const struct SessionConnectMessage *scm;
2589 struct GNUNET_TIME_Absolute ts;
2590 struct NeighbourMapEntry *n;
2592 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2593 "Received CONNECT_ACK message from peer `%s'\n",
2596 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2598 GNUNET_break_op (0);
2601 scm = (const struct SessionConnectMessage *) message;
2602 GNUNET_break_op (ntohl (scm->reserved) == 0);
2603 if (NULL == (n = lookup_neighbour (peer)))
2605 GNUNET_STATISTICS_update (GST_stats,
2607 ("# unexpected CONNECT_ACK messages (no peer)"),
2611 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2614 case S_NOT_CONNECTED:
2616 free_neighbour (n, GNUNET_NO);
2619 case S_INIT_BLACKLIST:
2620 GNUNET_STATISTICS_update (GST_stats,
2622 ("# unexpected CONNECT_ACK messages (not ready)"),
2625 case S_CONNECT_SENT:
2626 if (ts.abs_value != n->primary_address.connect_timestamp.abs_value)
2627 break; /* ACK does not match our original CONNECT message */
2628 n->state = S_CONNECTED;
2629 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2630 GNUNET_STATISTICS_set (GST_stats,
2631 gettext_noop ("# peers connected"),
2632 ++neighbours_connected,
2634 connect_notify_cb (callback_cls, &n->id, ats, ats_count);
2635 /* Tell ATS that the outbound session we created to send CONNECT was successfull */
2636 GNUNET_ATS_address_add (GST_ats,
2637 n->primary_address.address,
2638 n->primary_address.session,
2640 set_address (&n->primary_address,
2641 n->primary_address.address,
2642 n->primary_address.session,
2643 n->primary_address.bandwidth_in,
2644 n->primary_address.bandwidth_out,
2646 send_session_ack_message (n);
2648 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2649 case S_CONNECT_RECV_ATS:
2650 case S_CONNECT_RECV_BLACKLIST:
2651 case S_CONNECT_RECV_ACK:
2652 GNUNET_STATISTICS_update (GST_stats,
2654 ("# unexpected CONNECT_ACK messages (not ready)"),
2658 /* duplicate CONNECT_ACK, let's answer by duplciate SESSION_ACK just in case */
2659 send_session_ack_message (n);
2661 case S_RECONNECT_ATS:
2662 case S_RECONNECT_BLACKLIST:
2663 /* we didn't expect any CONNECT_ACK, as we are waiting for ATS
2664 to give us a new address... */
2665 GNUNET_STATISTICS_update (GST_stats,
2667 ("# unexpected CONNECT_ACK messages (waiting on ATS)"),
2670 case S_RECONNECT_SENT:
2671 /* new address worked; go back to connected! */
2672 n->state = S_CONNECTED;
2673 send_session_ack_message (n);
2675 case S_CONNECTED_SWITCHING_BLACKLIST:
2676 /* duplicate CONNECT_ACK, let's answer by duplciate SESSION_ACK just in case */
2677 send_session_ack_message (n);
2679 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2680 /* new address worked; adopt it and go back to connected! */
2681 n->state = S_CONNECTED;
2682 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2683 GNUNET_break (GNUNET_NO == n->alternative_address.ats_active);
2684 GNUNET_ATS_address_add(GST_ats,
2685 n->alternative_address.address,
2686 n->alternative_address.session,
2688 set_address (&n->primary_address,
2689 n->alternative_address.address,
2690 n->alternative_address.session,
2691 n->alternative_address.bandwidth_in,
2692 n->alternative_address.bandwidth_out,
2694 free_address (&n->alternative_address);
2695 send_session_ack_message (n);
2698 GNUNET_STATISTICS_update (GST_stats,
2700 ("# unexpected CONNECT_ACK messages (disconnecting)"),
2703 case S_DISCONNECT_FINISHED:
2707 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2715 * A session was terminated. Take note; if needed, try to get
2716 * an alternative address from ATS.
2718 * @param peer identity of the peer where the session died
2719 * @param session session that is gone
2720 * @return GNUNET_YES if this was a session used, GNUNET_NO if
2721 * this session was not in use
2724 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
2725 struct Session *session)
2727 struct NeighbourMapEntry *n;
2728 struct BlackListCheckContext *bcc;
2729 struct BlackListCheckContext *bcc_next;
2731 /* make sure to cancel all ongoing blacklist checks involving 'session' */
2733 while (NULL != (bcc = bcc_next))
2735 bcc_next = bcc->next;
2736 if (bcc->na.session == session)
2738 GST_blacklist_test_cancel (bcc->bc);
2739 GNUNET_HELLO_address_free (bcc->na.address);
2740 GNUNET_CONTAINER_DLL_remove (bc_head,
2746 if (NULL == (n = lookup_neighbour (peer)))
2747 return GNUNET_NO; /* can't affect us */
2748 if (session != n->primary_address.session)
2750 if (session == n->alternative_address.session)
2752 free_address (&n->alternative_address);
2753 if ( (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
2754 (S_CONNECTED_SWITCHING_CONNECT_SENT == n->state) )
2755 n->state = S_CONNECTED;
2759 return GNUNET_NO; /* doesn't affect us further */
2762 n->expect_latency_response = GNUNET_NO;
2765 case S_NOT_CONNECTED:
2767 free_neighbour (n, GNUNET_NO);
2771 free_neighbour (n, GNUNET_NO);
2773 case S_INIT_BLACKLIST:
2774 case S_CONNECT_SENT:
2775 free_address (&n->primary_address);
2776 n->state = S_INIT_ATS;
2777 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2778 // FIXME: need to ask ATS for suggestions again?
2779 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2781 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2782 case S_CONNECT_RECV_ATS:
2783 case S_CONNECT_RECV_BLACKLIST:
2784 case S_CONNECT_RECV_ACK:
2785 /* error on inbound session; free neighbour entirely */
2786 free_address (&n->primary_address);
2787 free_neighbour (n, GNUNET_NO);
2790 free_address (&n->primary_address);
2791 n->state = S_RECONNECT_ATS;
2792 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2793 /* FIXME: is this ATS call needed? */
2794 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2796 case S_RECONNECT_ATS:
2797 /* we don't have an address, how can it go down? */
2800 case S_RECONNECT_BLACKLIST:
2801 case S_RECONNECT_SENT:
2802 n->state = S_RECONNECT_ATS;
2803 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2804 // FIXME: need to ask ATS for suggestions again?
2805 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2807 case S_CONNECTED_SWITCHING_BLACKLIST:
2808 /* primary went down while we were checking secondary against
2809 blacklist, adopt secondary as primary */
2810 free_address (&n->primary_address);
2811 n->primary_address = n->alternative_address;
2812 memset (&n->alternative_address, 0, sizeof (struct NeighbourAddress));
2813 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
2814 n->state = S_RECONNECT_BLACKLIST;
2816 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2817 /* primary went down while we were waiting for CONNECT_ACK on secondary;
2818 secondary as primary */
2819 free_address (&n->primary_address);
2820 n->primary_address = n->alternative_address;
2821 memset (&n->alternative_address, 0, sizeof (struct NeighbourAddress));
2822 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
2823 n->state = S_RECONNECT_SENT;
2826 free_address (&n->primary_address);
2828 case S_DISCONNECT_FINISHED:
2829 /* neighbour was freed and plugins told to terminate session */
2833 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2837 if (GNUNET_SCHEDULER_NO_TASK != n->task)
2838 GNUNET_SCHEDULER_cancel (n->task);
2839 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
2845 * We received a 'SESSION_ACK' message from the other peer.
2846 * If we sent a 'CONNECT_ACK' last, this means we are now
2847 * connected. Otherwise, do nothing.
2849 * @param message possibly a 'struct SessionConnectMessage' (check format)
2850 * @param peer identity of the peer to switch the address for
2851 * @param address address of the other peer, NULL if other peer
2853 * @param session session to use (or NULL)
2854 * @param ats performance data
2855 * @param ats_count number of entries in ats
2858 GST_neighbours_handle_session_ack (const struct GNUNET_MessageHeader *message,
2859 const struct GNUNET_PeerIdentity *peer,
2860 const struct GNUNET_HELLO_Address *address,
2861 struct Session *session,
2862 const struct GNUNET_ATS_Information *ats,
2865 struct NeighbourMapEntry *n;
2867 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2868 "Received SESSION_ACK message from peer `%s'\n",
2870 if (ntohs (message->size) != sizeof (struct GNUNET_MessageHeader))
2872 GNUNET_break_op (0);
2875 if (NULL == (n = lookup_neighbour (peer)))
2877 /* check if we are in a plausible state for having sent
2878 a CONNECT_ACK. If not, return, otherwise break */
2879 if ( ( (S_CONNECT_RECV_ACK != n->state) &&
2880 (S_CONNECT_SENT != n->state) ) ||
2881 (2 != n->send_connect_ack) )
2883 GNUNET_STATISTICS_update (GST_stats,
2884 gettext_noop ("# unexpected SESSION ACK messages"), 1,
2888 n->state = S_CONNECTED;
2889 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2890 GNUNET_STATISTICS_set (GST_stats,
2891 gettext_noop ("# peers connected"),
2892 ++neighbours_connected,
2894 connect_notify_cb (callback_cls, &n->id, ats, ats_count);
2895 GNUNET_ATS_address_add(GST_ats,
2896 n->primary_address.address,
2897 n->primary_address.session,
2899 set_address (&n->primary_address,
2900 n->primary_address.address,
2901 n->primary_address.session,
2902 n->primary_address.bandwidth_in,
2903 n->primary_address.bandwidth_out,
2909 * Test if we're connected to the given peer.
2911 * @param target peer to test
2912 * @return GNUNET_YES if we are connected, GNUNET_NO if not
2915 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
2917 return test_connected (lookup_neighbour (target));
2922 * Change the incoming quota for the given peer.
2924 * @param neighbour identity of peer to change qutoa for
2925 * @param quota new quota
2928 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
2929 struct GNUNET_BANDWIDTH_Value32NBO quota)
2931 struct NeighbourMapEntry *n;
2933 if (NULL == (n = lookup_neighbour (neighbour)))
2935 GNUNET_STATISTICS_update (GST_stats,
2937 ("# SET QUOTA messages ignored (no such peer)"),
2941 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2942 "Setting inbound quota of %u Bps for peer `%s' to all clients\n",
2943 ntohl (quota.value__), GNUNET_i2s (&n->id));
2944 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
2945 if (0 != ntohl (quota.value__))
2947 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
2948 GNUNET_i2s (&n->id), "SET_QUOTA");
2949 if (GNUNET_YES == test_connected (n))
2950 GNUNET_STATISTICS_update (GST_stats,
2951 gettext_noop ("# disconnects due to quota of 0"),
2953 disconnect_neighbour (n);
2958 * We received a disconnect message from the given peer,
2959 * validate and process.
2961 * @param peer sender of the message
2962 * @param msg the disconnect message
2965 GST_neighbours_handle_disconnect_message (const struct GNUNET_PeerIdentity
2967 const struct GNUNET_MessageHeader
2970 struct NeighbourMapEntry *n;
2971 const struct SessionDisconnectMessage *sdm;
2972 struct GNUNET_HashCode hc;
2974 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2975 "Received DISCONNECT message from peer `%s'\n",
2977 if (ntohs (msg->size) != sizeof (struct SessionDisconnectMessage))
2979 // GNUNET_break_op (0);
2980 GNUNET_STATISTICS_update (GST_stats,
2982 ("# disconnect messages ignored (old format)"), 1,
2986 sdm = (const struct SessionDisconnectMessage *) msg;
2987 if (NULL == (n = lookup_neighbour (peer)))
2988 return; /* gone already */
2989 if (GNUNET_TIME_absolute_ntoh (sdm->timestamp).abs_value <= n->connect_ack_timestamp.abs_value)
2991 GNUNET_STATISTICS_update (GST_stats,
2993 ("# disconnect messages ignored (timestamp)"), 1,
2997 GNUNET_CRYPTO_hash (&sdm->public_key,
2998 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3000 if (0 != memcmp (peer, &hc, sizeof (struct GNUNET_PeerIdentity)))
3002 GNUNET_break_op (0);
3005 if (ntohl (sdm->purpose.size) !=
3006 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3007 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
3008 sizeof (struct GNUNET_TIME_AbsoluteNBO))
3010 GNUNET_break_op (0);
3014 GNUNET_CRYPTO_rsa_verify
3015 (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT, &sdm->purpose,
3016 &sdm->signature, &sdm->public_key))
3018 GNUNET_break_op (0);
3021 if (GNUNET_YES == test_connected (n))
3022 GNUNET_STATISTICS_update (GST_stats,
3024 ("# other peer asked to disconnect from us"), 1,
3026 disconnect_neighbour (n);
3031 * Closure for the neighbours_iterate function.
3033 struct IteratorContext
3036 * Function to call on each connected neighbour.
3038 GST_NeighbourIterator cb;
3048 * Call the callback from the closure for each connected neighbour.
3050 * @param cls the 'struct IteratorContext'
3051 * @param key the hash of the public key of the neighbour
3052 * @param value the 'struct NeighbourMapEntry'
3053 * @return GNUNET_OK (continue to iterate)
3056 neighbours_iterate (void *cls, const struct GNUNET_HashCode * key, void *value)
3058 struct IteratorContext *ic = cls;
3059 struct NeighbourMapEntry *n = value;
3061 if (GNUNET_YES == test_connected (n))
3062 ic->cb (ic->cb_cls, &n->id, NULL, 0, n->primary_address.address);
3068 * Iterate over all connected neighbours.
3070 * @param cb function to call
3071 * @param cb_cls closure for cb
3074 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
3076 struct IteratorContext ic;
3078 if (NULL == neighbours)
3079 return; /* can happen during shutdown */
3082 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
3087 * If we have an active connection to the given target, it must be shutdown.
3089 * @param target peer to disconnect from
3092 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
3094 struct NeighbourMapEntry *n;
3096 if (NULL == (n = lookup_neighbour (target)))
3097 return; /* not active */
3098 if (GNUNET_YES == test_connected (n))
3099 GNUNET_STATISTICS_update (GST_stats,
3101 ("# disconnected from peer upon explicit request"), 1,
3103 disconnect_neighbour (n);
3108 * Obtain current latency information for the given neighbour.
3110 * @param peer to get the latency for
3111 * @return observed latency of the address, FOREVER if the
3112 * the connection is not up
3114 struct GNUNET_TIME_Relative
3115 GST_neighbour_get_latency (const struct GNUNET_PeerIdentity *peer)
3117 struct NeighbourMapEntry *n;
3119 n = lookup_neighbour (peer);
3121 return GNUNET_TIME_UNIT_FOREVER_REL;
3125 case S_RECONNECT_SENT:
3126 case S_RECONNECT_ATS:
3128 case S_NOT_CONNECTED:
3129 case S_INIT_BLACKLIST:
3131 case S_CONNECT_RECV_BLACKLIST_INBOUND:
3132 case S_CONNECT_SENT:
3133 case S_CONNECT_RECV_BLACKLIST:
3135 case S_DISCONNECT_FINISHED:
3136 return GNUNET_TIME_UNIT_FOREVER_REL;
3138 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
3142 return GNUNET_TIME_UNIT_FOREVER_REL;
3147 * Obtain current address information for the given neighbour.
3150 * @return address currently used
3152 struct GNUNET_HELLO_Address *
3153 GST_neighbour_get_current_address (const struct GNUNET_PeerIdentity *peer)
3155 struct NeighbourMapEntry *n;
3157 n = lookup_neighbour (peer);
3160 return n->primary_address.address;
3165 * Initialize the neighbours subsystem.
3167 * @param cls closure for callbacks
3168 * @param connect_cb function to call if we connect to a peer
3169 * @param disconnect_cb function to call if we disconnect from a peer
3170 * @param peer_address_cb function to call if we change an active address
3174 GST_neighbours_start (void *cls,
3175 GNUNET_TRANSPORT_NotifyConnect connect_cb,
3176 GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb,
3177 GNUNET_TRANSPORT_PeerIterateCallback peer_address_cb)
3180 connect_notify_cb = connect_cb;
3181 disconnect_notify_cb = disconnect_cb;
3182 address_change_cb = peer_address_cb;
3183 neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE);
3188 * Disconnect from the given neighbour.
3191 * @param key hash of neighbour's public key (not used)
3192 * @param value the 'struct NeighbourMapEntry' of the neighbour
3193 * @return GNUNET_OK (continue to iterate)
3196 disconnect_all_neighbours (void *cls, const struct GNUNET_HashCode * key, void *value)
3198 struct NeighbourMapEntry *n = value;
3200 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3201 "Disconnecting peer `%4s', %s\n",
3202 GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
3203 n->state = S_DISCONNECT_FINISHED;
3204 free_neighbour (n, GNUNET_NO);
3210 * Cleanup the neighbours subsystem.
3213 GST_neighbours_stop ()
3215 if (NULL == neighbours)
3217 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
3218 &disconnect_all_neighbours,
3220 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
3222 callback_cls = NULL;
3223 connect_notify_cb = NULL;
3224 disconnect_notify_cb = NULL;
3225 address_change_cb = NULL;
3229 /* end of file gnunet-service-transport_neighbours.c */