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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; clean up state now!
373 S_DISCONNECT_FINISHED
378 * A possible address we could use to communicate with a neighbour.
380 struct NeighbourAddress
384 * Active session for this address.
386 struct Session *session;
389 * Network-level address information.
391 struct GNUNET_HELLO_Address *address;
394 * Timestamp of the 'SESSION_CONNECT' message we sent to the other
395 * peer for this address. Use to check that the ACK is in response
396 * to our most recent 'CONNECT'.
398 struct GNUNET_TIME_Absolute connect_timestamp;
401 * Inbound bandwidth from ATS for this address.
403 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in;
406 * Outbound bandwidth from ATS for this address.
408 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out;
411 * Did we tell ATS that this is our 'active' address?
419 * Entry in neighbours.
421 struct NeighbourMapEntry
425 * Head of list of messages we would like to send to this peer;
426 * must contain at most one message per client.
428 struct MessageQueue *messages_head;
431 * Tail of list of messages we would like to send to this peer; must
432 * contain at most one message per client.
434 struct MessageQueue *messages_tail;
437 * Are we currently trying to send a message? If so, which one?
439 struct MessageQueue *is_active;
442 * Primary address we currently use to communicate with the neighbour.
444 struct NeighbourAddress primary_address;
447 * Alternative address currently under consideration for communicating
448 * with the neighbour.
450 struct NeighbourAddress alternative_address;
453 * Identity of this neighbour.
455 struct GNUNET_PeerIdentity id;
458 * Main task that drives this peer (timeouts, keepalives, etc.).
459 * Always runs the 'master_task'.
461 GNUNET_SCHEDULER_TaskIdentifier task;
464 * At what time should we sent the next keep-alive message?
466 struct GNUNET_TIME_Absolute keep_alive_time;
469 * At what time did we sent the last keep-alive message? Used
470 * to calculate round-trip time ("latency").
472 struct GNUNET_TIME_Absolute last_keep_alive_time;
475 * Timestamp we should include in our next CONNECT_ACK message.
476 * (only valid if 'send_connect_ack' is GNUNET_YES). Used to build
477 * our CONNECT_ACK message.
479 struct GNUNET_TIME_Absolute connect_ack_timestamp;
482 * Time where we should cut the connection (timeout) if we don't
483 * make progress in the state machine (or get a KEEPALIVE_RESPONSE
484 * if we are in S_CONNECTED).
486 struct GNUNET_TIME_Absolute timeout;
489 * Latest calculated latency value
491 struct GNUNET_TIME_Relative latency;
494 * Tracker for inbound bandwidth.
496 struct GNUNET_BANDWIDTH_Tracker in_tracker;
499 * How often has the other peer (recently) violated the inbound
500 * traffic limit? Incremented by 10 per violation, decremented by 1
501 * per non-violation (for each time interval).
503 unsigned int quota_violation_count;
506 * The current state of the peer.
511 * Did we sent an KEEP_ALIVE message and are we expecting a response?
513 int expect_latency_response;
516 * Flag to set if we still need to send a CONNECT_ACK message to the other peer
517 * (once we have an address to use and the peer has been allowed by our
518 * blacklist). Set to 1 if we need to send a CONNECT_ACK. Set to 2 if we
519 * did send a CONNECT_ACK and should go to 'S_CONNECTED' upon receiving
520 * a 'SESSION_ACK' (regardless of what our own state machine might say).
522 int send_connect_ack;
528 * Context for blacklist checks and the 'handle_test_blacklist_cont'
529 * function. Stores information about ongoing blacklist checks.
531 struct BlackListCheckContext
535 * We keep blacklist checks in a DLL.
537 struct BlackListCheckContext *next;
540 * We keep blacklist checks in a DLL.
542 struct BlackListCheckContext *prev;
545 * Address that is being checked.
547 struct NeighbourAddress na;
550 * ATS information about the address.
552 struct GNUNET_ATS_Information *ats;
555 * Handle to the ongoing blacklist check.
557 struct GST_BlacklistCheck *bc;
560 * Size of the 'ats' array.
568 * Hash map from peer identities to the respective 'struct NeighbourMapEntry'.
570 static struct GNUNET_CONTAINER_MultiHashMap *neighbours;
573 * We keep blacklist checks in a DLL so that we can find
574 * the 'sessions' in their 'struct NeighbourAddress' if
575 * a session goes down.
577 static struct BlackListCheckContext *bc_head;
580 * We keep blacklist checks in a DLL.
582 static struct BlackListCheckContext *bc_tail;
585 * Closure for connect_notify_cb, disconnect_notify_cb and address_change_cb
587 static void *callback_cls;
590 * Function to call when we connected to a neighbour.
592 static GNUNET_TRANSPORT_NotifyConnect connect_notify_cb;
595 * Function to call when we disconnected from a neighbour.
597 static GNUNET_TRANSPORT_NotifyDisconnect disconnect_notify_cb;
600 * Function to call when we changed an active address of a neighbour.
602 static GNUNET_TRANSPORT_PeerIterateCallback address_change_cb;
605 * counter for connected neighbours
607 static unsigned int neighbours_connected;
610 * Number of bytes we have currently queued for transmission.
612 static unsigned long long bytes_in_send_queue;
616 * Lookup a neighbour entry in the neighbours hash map.
618 * @param pid identity of the peer to look up
619 * @return the entry, NULL if there is no existing record
621 static struct NeighbourMapEntry *
622 lookup_neighbour (const struct GNUNET_PeerIdentity *pid)
624 if (NULL == neighbours)
626 return GNUNET_CONTAINER_multihashmap_get (neighbours, &pid->hashPubKey);
630 print_state (int state)
635 case S_NOT_CONNECTED:
636 return "S_NOT_CONNECTED";
641 case S_INIT_BLACKLIST:
642 return "S_INIT_BLACKLIST";
645 return "S_CONNECT_SENT";
647 case S_CONNECT_RECV_BLACKLIST_INBOUND:
648 return "S_CONNECT_RECV_BLACKLIST_INBOUND";
650 case S_CONNECT_RECV_ATS:
651 return "S_CONNECT_RECV_ATS";
653 case S_CONNECT_RECV_BLACKLIST:
654 return "S_CONNECT_RECV_BLACKLIST";
656 case S_CONNECT_RECV_ACK:
657 return "S_CONNECT_RECV_ACK";
660 return "S_CONNECTED";
662 case S_RECONNECT_ATS:
663 return "S_RECONNECT_ATS";
665 case S_RECONNECT_BLACKLIST:
666 return "S_RECONNECT_BLACKLIST";
668 case S_RECONNECT_SENT:
669 return "S_RECONNECT_SENT";
671 case S_CONNECTED_SWITCHING_BLACKLIST:
672 return "S_CONNECTED_SWITCHING_BLACKLIST";
674 case S_CONNECTED_SWITCHING_CONNECT_SENT:
675 return "S_CONNECTED_SWITCHING_CONNECT_SENT";
678 return "S_DISCONNECT";
680 case S_DISCONNECT_FINISHED:
681 return "S_DISCONNECT_FINISHED";
693 * Test if we're connected to the given peer.
695 * @param n neighbour entry of peer to test
696 * @return GNUNET_YES if we are connected, GNUNET_NO if not
699 test_connected (struct NeighbourMapEntry *n)
705 case S_NOT_CONNECTED:
707 case S_INIT_BLACKLIST:
709 case S_CONNECT_RECV_BLACKLIST_INBOUND:
710 case S_CONNECT_RECV_ATS:
711 case S_CONNECT_RECV_BLACKLIST:
712 case S_CONNECT_RECV_ACK:
715 case S_RECONNECT_ATS:
716 case S_RECONNECT_BLACKLIST:
717 case S_RECONNECT_SENT:
718 case S_CONNECTED_SWITCHING_BLACKLIST:
719 case S_CONNECTED_SWITCHING_CONNECT_SENT:
722 case S_DISCONNECT_FINISHED:
725 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
729 return GNUNET_SYSERR;
733 * Send information about a new outbound quota to our clients.
735 * @param target affected peer
736 * @param quota new quota
739 send_outbound_quota (const struct GNUNET_PeerIdentity *target,
740 struct GNUNET_BANDWIDTH_Value32NBO quota)
742 struct QuotaSetMessage q_msg;
744 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
745 "Sending outbound quota of %u Bps for peer `%s' to all clients\n",
746 ntohl (quota.value__), GNUNET_i2s (target));
747 q_msg.header.size = htons (sizeof (struct QuotaSetMessage));
748 q_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA);
750 q_msg.peer = (*target);
751 GST_clients_broadcast (&q_msg.header, GNUNET_NO);
756 * We don't need a given neighbour address any more.
757 * Release its resources and give appropriate notifications
758 * to ATS and other subsystems.
760 * @param na address we are done with; 'na' itself must NOT be 'free'd, only the contents!
763 free_address (struct NeighbourAddress *na)
765 if (GNUNET_YES == na->ats_active)
767 GST_validation_set_address_use (na->address, na->session, GNUNET_NO, __LINE__);
768 GNUNET_ATS_address_in_use (GST_ats, na->address, na->session, GNUNET_NO);
770 na->ats_active = GNUNET_NO;
771 if (NULL != na->address)
773 GNUNET_HELLO_address_free (na->address);
781 * Initialize the 'struct NeighbourAddress'.
783 * @param na neighbour address to initialize
784 * @param address address of the other peer, NULL if other peer
786 * @param session session to use (or NULL, in which case an
787 * address must be setup)
788 * @param bandwidth_in inbound quota to be used when connection is up
789 * @param bandwidth_out outbound quota to be used when connection is up
790 * @param is_active GNUNET_YES to mark this as the active address with ATS
793 set_address (struct NeighbourAddress *na,
794 const struct GNUNET_HELLO_Address *address,
795 struct Session *session,
796 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
797 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
800 struct GNUNET_TRANSPORT_PluginFunctions *papi;
802 if (NULL == (papi = GST_plugins_find (address->transport_name)))
807 if (session == na->session)
809 na->bandwidth_in = bandwidth_in;
810 na->bandwidth_out = bandwidth_out;
811 if (is_active != na->ats_active)
813 na->ats_active = is_active;
814 GNUNET_ATS_address_in_use (GST_ats, na->address, na->session, is_active);
815 GST_validation_set_address_use (na->address, na->session, is_active, __LINE__);
817 if (GNUNET_YES == is_active)
819 /* FIXME: is this the right place to set quotas? */
820 GST_neighbours_set_incoming_quota (&address->peer, bandwidth_in);
821 send_outbound_quota (&address->peer, bandwidth_out);
827 session = papi->get_session (papi->cls, address);
830 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
831 "Failed to obtain new session for peer `%s' and address '%s'\n",
832 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
833 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
836 na->address = GNUNET_HELLO_address_copy (address);
837 na->bandwidth_in = bandwidth_in;
838 na->bandwidth_out = bandwidth_out;
839 na->session = session;
840 na->ats_active = is_active;
841 if (GNUNET_YES == is_active)
843 /* Telling ATS about new session */
844 GNUNET_ATS_address_in_use (GST_ats, na->address, na->session, GNUNET_YES);
845 GST_validation_set_address_use (na->address, na->session, GNUNET_YES, __LINE__);
847 /* FIXME: is this the right place to set quotas? */
848 GST_neighbours_set_incoming_quota (&address->peer, bandwidth_in);
849 send_outbound_quota (&address->peer, bandwidth_out);
855 * Free a neighbour map entry.
857 * @param n entry to free
858 * @param keep_sessions GNUNET_NO to tell plugin to terminate sessions,
859 * GNUNET_YES to keep all sessions
862 free_neighbour (struct NeighbourMapEntry *n, int keep_sessions)
864 struct MessageQueue *mq;
865 struct GNUNET_TRANSPORT_PluginFunctions *papi;
867 n->is_active = NULL; /* always free'd by its own continuation! */
869 /* fail messages currently in the queue */
870 while (NULL != (mq = n->messages_head))
872 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
873 if (NULL != mq->cont)
874 mq->cont (mq->cont_cls, GNUNET_SYSERR);
877 /* It is too late to send other peer disconnect notifications, but at
878 least internally we need to get clean... */
879 if (GNUNET_YES == test_connected (n))
881 GNUNET_STATISTICS_set (GST_stats,
882 gettext_noop ("# peers connected"),
883 --neighbours_connected,
885 disconnect_notify_cb (callback_cls, &n->id);
888 /* FIXME-PLUGIN-API: This does not seem to guarantee that all
889 transport sessions eventually get killed due to inactivity; they
890 MUST have their own timeout logic (but at least TCP doesn't have
891 one yet). Are we sure that EVERY 'session' of a plugin is
892 actually cleaned up this way!? Note that if we are switching
893 between two TCP sessions to the same peer, the existing plugin
894 API gives us not even the means to selectively kill only one of
895 them! Killing all sessions like this seems to be very, very
897 if ((GNUNET_NO == keep_sessions) &&
898 (NULL != n->primary_address.address) &&
899 (NULL != (papi = GST_plugins_find (n->primary_address.address->transport_name))))
900 papi->disconnect (papi->cls, &n->id);
902 n->state = S_DISCONNECT_FINISHED;
904 GNUNET_assert (GNUNET_YES ==
905 GNUNET_CONTAINER_multihashmap_remove (neighbours,
906 &n->id.hashPubKey, n));
908 /* cut transport-level connection */
909 free_address (&n->primary_address);
910 free_address (&n->alternative_address);
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 */
929 * Transmit a message using the current session of the given
932 * @param n entry for the recipient
933 * @param msgbuf buffer to transmit
934 * @param msgbuf_size number of bytes in buffer
935 * @param priority transmission priority
936 * @param timeout transmission timeout
937 * @param cont continuation to call when finished (can be NULL)
938 * @param cont_cls closure for cont
941 send_with_session (struct NeighbourMapEntry *n,
942 const char *msgbuf, size_t msgbuf_size,
944 struct GNUNET_TIME_Relative timeout,
945 GNUNET_TRANSPORT_TransmitContinuation cont,
948 struct GNUNET_TRANSPORT_PluginFunctions *papi;
950 GNUNET_assert (n->primary_address.session != NULL);
951 if ( ( (NULL == (papi = GST_plugins_find (n->primary_address.address->transport_name))) ||
952 (-1 == papi->send (papi->cls,
953 n->primary_address.session,
959 cont (cont_cls, &n->id, GNUNET_SYSERR);
960 GNUNET_break (NULL != papi);
965 * Master task run for every neighbour. Performs all of the time-related
966 * activities (keep alive, send next message, disconnect if idle, finish
967 * clean up after disconnect).
969 * @param cls the 'struct NeighbourMapEntry' for which we are running
970 * @param tc scheduler context (unused)
973 master_task (void *cls,
974 const struct GNUNET_SCHEDULER_TaskContext *tc);
978 * Function called when the 'DISCONNECT' message has been sent by the
979 * plugin. Frees the neighbour --- if the entry still exists.
982 * @param target identity of the neighbour that was disconnected
983 * @param result GNUNET_OK if the disconnect got out successfully
986 send_disconnect_cont (void *cls, const struct GNUNET_PeerIdentity *target,
989 struct NeighbourMapEntry *n;
991 n = lookup_neighbour (target);
993 return; /* already gone */
994 if (S_DISCONNECT != n->state)
995 return; /* have created a fresh entry since */
996 n->state = S_DISCONNECT;
997 if (GNUNET_SCHEDULER_NO_TASK != n->task)
998 GNUNET_SCHEDULER_cancel (n->task);
999 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1004 * Transmit a DISCONNECT message to the other peer.
1006 * @param n neighbour to send DISCONNECT message.
1009 send_disconnect (struct NeighbourMapEntry *n)
1011 struct SessionDisconnectMessage disconnect_msg;
1013 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1014 "Sending DISCONNECT message to peer `%4s'\n",
1015 GNUNET_i2s (&n->id));
1016 disconnect_msg.header.size = htons (sizeof (struct SessionDisconnectMessage));
1017 disconnect_msg.header.type =
1018 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1019 disconnect_msg.reserved = htonl (0);
1020 disconnect_msg.purpose.size =
1021 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
1022 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
1023 sizeof (struct GNUNET_TIME_AbsoluteNBO));
1024 disconnect_msg.purpose.purpose =
1025 htonl (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1026 disconnect_msg.timestamp =
1027 GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1028 disconnect_msg.public_key = GST_my_public_key;
1029 GNUNET_assert (GNUNET_OK ==
1030 GNUNET_CRYPTO_rsa_sign (GST_my_private_key,
1031 &disconnect_msg.purpose,
1032 &disconnect_msg.signature));
1034 send_with_session (n,
1035 (const char *) &disconnect_msg, sizeof (disconnect_msg),
1036 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
1037 &send_disconnect_cont, NULL);
1038 GNUNET_STATISTICS_update (GST_stats,
1040 ("# DISCONNECT messages sent"), 1,
1046 * Disconnect from the given neighbour, clean up the record.
1048 * @param n neighbour to disconnect from
1051 disconnect_neighbour (struct NeighbourMapEntry *n)
1053 /* depending on state, notify neighbour and/or upper layers of this peer
1057 case S_NOT_CONNECTED:
1059 case S_INIT_BLACKLIST:
1060 /* other peer is completely unaware of us, no need to send DISCONNECT */
1061 n->state = S_DISCONNECT_FINISHED;
1062 free_neighbour (n, GNUNET_NO);
1064 case S_CONNECT_SENT:
1065 send_disconnect (n);
1066 n->state = S_DISCONNECT;
1068 case S_CONNECT_RECV_BLACKLIST_INBOUND:
1069 case S_CONNECT_RECV_ATS:
1070 case S_CONNECT_RECV_BLACKLIST:
1071 /* we never ACK'ed the other peer's request, no need to send DISCONNECT */
1072 n->state = S_DISCONNECT_FINISHED;
1073 free_neighbour (n, GNUNET_NO);
1075 case S_CONNECT_RECV_ACK:
1076 /* we DID ACK the other peer's request, must send DISCONNECT */
1077 send_disconnect (n);
1078 n->state = S_DISCONNECT;
1081 case S_RECONNECT_BLACKLIST:
1082 case S_RECONNECT_SENT:
1083 case S_CONNECTED_SWITCHING_BLACKLIST:
1084 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1085 /* we are currently connected, need to send disconnect and do
1086 internal notifications and update statistics */
1087 send_disconnect (n);
1088 GNUNET_STATISTICS_set (GST_stats,
1089 gettext_noop ("# peers connected"),
1090 --neighbours_connected,
1092 disconnect_notify_cb (callback_cls, &n->id);
1093 n->state = S_DISCONNECT;
1095 case S_RECONNECT_ATS:
1096 /* ATS address request timeout, disconnect without sending disconnect message */
1097 GNUNET_STATISTICS_set (GST_stats,
1098 gettext_noop ("# peers connected"),
1099 --neighbours_connected,
1101 disconnect_notify_cb (callback_cls, &n->id);
1102 n->state = S_DISCONNECT;
1105 /* already disconnected, ignore */
1107 case S_DISCONNECT_FINISHED:
1108 /* already cleaned up, how did we get here!? */
1112 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1116 /* schedule timeout to clean up */
1117 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1118 GNUNET_SCHEDULER_cancel (n->task);
1119 n->task = GNUNET_SCHEDULER_add_delayed (DISCONNECT_SENT_TIMEOUT,
1125 * We're done with our transmission attempt, continue processing.
1127 * @param cls the 'struct MessageQueue' of the message
1128 * @param receiver intended receiver
1129 * @param success whether it worked or not
1132 transmit_send_continuation (void *cls,
1133 const struct GNUNET_PeerIdentity *receiver,
1136 struct MessageQueue *mq = cls;
1137 struct NeighbourMapEntry *n;
1139 if (NULL == (n = lookup_neighbour (receiver)))
1142 return; /* disconnect or other error while transmitting, can happen */
1144 if (n->is_active == mq)
1146 /* this is still "our" neighbour, remove us from its queue
1147 and allow it to send the next message now */
1148 n->is_active = NULL;
1149 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1150 GNUNET_SCHEDULER_cancel (n->task);
1151 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1153 GNUNET_assert (bytes_in_send_queue >= mq->message_buf_size);
1154 bytes_in_send_queue -= mq->message_buf_size;
1155 GNUNET_STATISTICS_set (GST_stats,
1157 ("# bytes in message queue for other peers"),
1158 bytes_in_send_queue, GNUNET_NO);
1159 if (GNUNET_OK == success)
1160 GNUNET_STATISTICS_update (GST_stats,
1162 ("# messages transmitted to other peers"),
1165 GNUNET_STATISTICS_update (GST_stats,
1167 ("# transmission failures for messages to other peers"),
1169 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1170 "Sending message to `%s' of type %u was a %s\n",
1171 GNUNET_i2s (receiver),
1172 ntohs (((struct GNUNET_MessageHeader *) mq->message_buf)->type),
1173 (success == GNUNET_OK) ? "success" : "FAILURE");
1174 if (NULL != mq->cont)
1175 mq->cont (mq->cont_cls, success);
1181 * Check the message list for the given neighbour and if we can
1182 * send a message, do so. This function should only be called
1183 * if the connection is at least generally ready for transmission.
1184 * While we will only send one message at a time, no bandwidth
1185 * quota management is performed here. If a message was given to
1186 * the plugin, the continuation will automatically re-schedule
1187 * the 'master' task once the next message might be transmitted.
1189 * @param n target peer for which to transmit
1192 try_transmission_to_peer (struct NeighbourMapEntry *n)
1194 struct MessageQueue *mq;
1195 struct GNUNET_TIME_Relative timeout;
1197 if (NULL == n->primary_address.address)
1199 /* no address, why are we here? */
1203 if ((0 == n->primary_address.address->address_length) &&
1204 (NULL == n->primary_address.session))
1206 /* no address, why are we here? */
1210 if (NULL != n->is_active)
1212 /* transmission already pending */
1216 /* timeout messages from the queue that are past their due date */
1217 while (NULL != (mq = n->messages_head))
1219 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1220 if (timeout.rel_value > 0)
1222 GNUNET_STATISTICS_update (GST_stats,
1224 ("# messages timed out while in transport queue"),
1226 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
1228 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR); /* timeout */
1231 return; /* no more messages */
1232 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
1234 send_with_session (n,
1235 mq->message_buf, mq->message_buf_size,
1236 0 /* priority */, timeout,
1237 &transmit_send_continuation, mq);
1242 * Send keepalive message to the neighbour. Must only be called
1243 * if we are on 'connected' state. Will internally determine
1244 * if a keepalive is truly needed (so can 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 if (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time).rel_value > 0)
1255 return; /* no keepalive needed at this time */
1256 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1257 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE);
1258 send_with_session (n,
1259 (const void *) &m, sizeof (m),
1260 UINT32_MAX /* priority */,
1261 KEEPALIVE_FREQUENCY,
1263 GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# keepalives sent"), 1,
1265 n->expect_latency_response = GNUNET_YES;
1266 n->last_keep_alive_time = GNUNET_TIME_absolute_get ();
1267 n->keep_alive_time = GNUNET_TIME_relative_to_absolute (KEEPALIVE_FREQUENCY);
1272 * Keep the connection to the given neighbour alive longer,
1273 * we received a KEEPALIVE (or equivalent); send a response.
1275 * @param neighbour neighbour to keep alive (by sending keep alive response)
1278 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
1280 struct NeighbourMapEntry *n;
1281 struct GNUNET_MessageHeader m;
1283 if (NULL == (n = lookup_neighbour (neighbour)))
1285 GNUNET_STATISTICS_update (GST_stats,
1287 ("# KEEPALIVE messages discarded (peer unknown)"),
1291 if (NULL == n->primary_address.session)
1293 GNUNET_STATISTICS_update (GST_stats,
1295 ("# KEEPALIVE messages discarded (no session)"),
1299 /* send reply to allow neighbour to measure latency */
1300 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1301 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE_RESPONSE);
1302 send_with_session(n,
1303 (const void *) &m, sizeof (m),
1304 UINT32_MAX /* priority */,
1305 KEEPALIVE_FREQUENCY,
1311 * We received a KEEP_ALIVE_RESPONSE message and use this to calculate
1312 * latency to this peer. Pass the updated information (existing ats
1313 * plus calculated latency) to ATS.
1315 * @param neighbour neighbour to keep alive
1316 * @param ats performance data
1317 * @param ats_count number of entries in ats
1320 GST_neighbours_keepalive_response (const struct GNUNET_PeerIdentity *neighbour,
1321 const struct GNUNET_ATS_Information *ats,
1324 struct NeighbourMapEntry *n;
1326 struct GNUNET_ATS_Information ats_new[ats_count + 1];
1328 if (NULL == (n = lookup_neighbour (neighbour)))
1330 GNUNET_STATISTICS_update (GST_stats,
1332 ("# KEEPALIVE_RESPONSE messages discarded (not connected)"),
1336 if ( (S_CONNECTED != n->state) ||
1337 (GNUNET_YES != n->expect_latency_response) )
1339 GNUNET_STATISTICS_update (GST_stats,
1341 ("# KEEPALIVE_RESPONSE messages discarded (not expected)"),
1345 n->expect_latency_response = GNUNET_NO;
1346 n->latency = GNUNET_TIME_absolute_get_duration (n->last_keep_alive_time);
1347 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1348 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1349 "Latency for peer `%s' is %llu ms\n",
1350 GNUNET_i2s (&n->id), n->latency.rel_value);
1351 memcpy (ats_new, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1352 /* append latency */
1353 ats_new[ats_count].type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
1354 if (n->latency.rel_value > UINT32_MAX)
1355 latency = UINT32_MAX;
1357 latency = n->latency.rel_value;
1358 ats_new[ats_count].value = htonl (latency);
1359 GNUNET_ATS_address_update (GST_ats,
1360 n->primary_address.address,
1361 n->primary_address.session, ats_new,
1367 * We have received a message from the given sender. How long should
1368 * we delay before receiving more? (Also used to keep the peer marked
1371 * @param sender sender of the message
1372 * @param size size of the message
1373 * @param do_forward set to GNUNET_YES if the message should be forwarded to clients
1374 * GNUNET_NO if the neighbour is not connected or violates the quota,
1375 * GNUNET_SYSERR if the connection is not fully up yet
1376 * @return how long to wait before reading more from this sender
1378 struct GNUNET_TIME_Relative
1379 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
1380 *sender, ssize_t size, int *do_forward)
1382 struct NeighbourMapEntry *n;
1383 struct GNUNET_TIME_Relative ret;
1385 if (NULL == neighbours)
1387 *do_forward = GNUNET_NO;
1388 return GNUNET_TIME_UNIT_FOREVER_REL; /* This can happen during shutdown */
1390 if (NULL == (n = lookup_neighbour (sender)))
1392 GST_neighbours_try_connect (sender);
1393 if (NULL == (n = lookup_neighbour (sender)))
1395 GNUNET_STATISTICS_update (GST_stats,
1397 ("# messages discarded due to lack of neighbour record"),
1399 *do_forward = GNUNET_NO;
1400 return GNUNET_TIME_UNIT_ZERO;
1403 if (! test_connected (n))
1405 *do_forward = GNUNET_SYSERR;
1406 return GNUNET_TIME_UNIT_ZERO;
1408 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
1410 n->quota_violation_count++;
1411 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1412 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
1413 n->in_tracker.available_bytes_per_s__,
1414 n->quota_violation_count);
1415 /* Discount 32k per violation */
1416 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
1420 if (n->quota_violation_count > 0)
1422 /* try to add 32k back */
1423 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
1424 n->quota_violation_count--;
1427 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
1429 GNUNET_STATISTICS_update (GST_stats,
1431 ("# bandwidth quota violations by other peers"),
1433 *do_forward = GNUNET_NO;
1434 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
1436 *do_forward = GNUNET_YES;
1437 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 32 * 1024);
1438 if (ret.rel_value > 0)
1440 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1441 "Throttling read (%llu bytes excess at %u b/s), waiting %llu ms before reading more.\n",
1442 (unsigned long long) n->in_tracker.
1443 consumption_since_last_update__,
1444 (unsigned int) n->in_tracker.available_bytes_per_s__,
1445 (unsigned long long) ret.rel_value);
1446 GNUNET_STATISTICS_update (GST_stats,
1447 gettext_noop ("# ms throttling suggested"),
1448 (int64_t) ret.rel_value, GNUNET_NO);
1455 * Transmit a message to the given target using the active connection.
1457 * @param target destination
1458 * @param msg message to send
1459 * @param msg_size number of bytes in msg
1460 * @param timeout when to fail with timeout
1461 * @param cont function to call when done
1462 * @param cont_cls closure for 'cont'
1465 GST_neighbours_send (const struct GNUNET_PeerIdentity *target, const void *msg,
1466 size_t msg_size, struct GNUNET_TIME_Relative timeout,
1467 GST_NeighbourSendContinuation cont, void *cont_cls)
1469 struct NeighbourMapEntry *n;
1470 struct MessageQueue *mq;
1472 /* All ove these cases should never happen; they are all API violations.
1473 But we check anyway, just to be sure. */
1474 if (NULL == (n = lookup_neighbour (target)))
1478 cont (cont_cls, GNUNET_SYSERR);
1481 if (GNUNET_YES != test_connected (n))
1485 cont (cont_cls, GNUNET_SYSERR);
1488 bytes_in_send_queue += msg_size;
1489 GNUNET_STATISTICS_set (GST_stats,
1491 ("# bytes in message queue for other peers"),
1492 bytes_in_send_queue, GNUNET_NO);
1493 mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
1495 mq->cont_cls = cont_cls;
1496 memcpy (&mq[1], msg, msg_size);
1497 mq->message_buf = (const char *) &mq[1];
1498 mq->message_buf_size = msg_size;
1499 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1500 GNUNET_CONTAINER_DLL_insert_tail (n->messages_head, n->messages_tail, mq);
1501 if ( (NULL != n->is_active) ||
1502 ( (NULL == n->primary_address.session) && (NULL == n->primary_address.address)) )
1504 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1505 GNUNET_SCHEDULER_cancel (n->task);
1506 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1511 * Send a SESSION_CONNECT message via the given address.
1513 * @param na address to use
1516 send_session_connect (struct NeighbourAddress *na)
1518 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1519 struct SessionConnectMessage connect_msg;
1521 if (NULL == (papi = GST_plugins_find (na->address->transport_name)))
1526 if (NULL == na->session)
1527 na->session = papi->get_session (papi->cls, na->address);
1528 if (NULL == na->session)
1533 na->connect_timestamp = GNUNET_TIME_absolute_get ();
1534 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1535 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
1536 connect_msg.reserved = htonl (0);
1537 connect_msg.timestamp = GNUNET_TIME_absolute_hton (na->connect_timestamp);
1538 (void) papi->send (papi->cls,
1540 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1542 GNUNET_TIME_UNIT_FOREVER_REL,
1548 * Send a SESSION_CONNECT_ACK message via the given address.
1550 * @param address address to use
1551 * @param session session to use
1552 * @param timestamp timestamp to use for the ACK message
1555 send_session_connect_ack_message (const struct GNUNET_HELLO_Address *address,
1556 struct Session *session,
1557 struct GNUNET_TIME_Absolute timestamp)
1559 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1560 struct SessionConnectMessage connect_msg;
1562 if (NULL == (papi = GST_plugins_find (address->transport_name)))
1567 if (NULL == session)
1568 session = papi->get_session (papi->cls, address);
1569 if (NULL == session)
1574 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1575 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT_ACK);
1576 connect_msg.reserved = htonl (0);
1577 connect_msg.timestamp = GNUNET_TIME_absolute_hton (timestamp);
1578 (void) papi->send (papi->cls,
1580 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1582 GNUNET_TIME_UNIT_FOREVER_REL,
1588 * Create a fresh entry in the neighbour map for the given peer
1590 * @param peer peer to create an entry for
1591 * @return new neighbour map entry
1593 static struct NeighbourMapEntry *
1594 setup_neighbour (const struct GNUNET_PeerIdentity *peer)
1596 struct NeighbourMapEntry *n;
1598 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1599 "Creating new neighbour entry for `%s'\n",
1601 n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
1603 n->state = S_NOT_CONNECTED;
1604 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
1605 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
1606 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
1607 MAX_BANDWIDTH_CARRY_S);
1608 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1609 GNUNET_assert (GNUNET_OK ==
1610 GNUNET_CONTAINER_multihashmap_put (neighbours,
1611 &n->id.hashPubKey, n,
1612 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1618 * Check if the two given addresses are the same.
1619 * Actually only checks if the sessions are non-NULL
1620 * (which they should be) and then if they are identical;
1621 * the actual addresses don't matter if the session
1622 * pointers match anyway, and we must have session pointers
1625 * @param a1 first address to compare
1626 * @param a2 other address to compare
1627 * @return GNUNET_NO if the addresses do not match, GNUNET_YES if they do match
1630 address_matches (const struct NeighbourAddress *a1,
1631 const struct NeighbourAddress *a2)
1633 if ( (NULL == a1->session) ||
1634 (NULL == a2->session) )
1639 return (a1->session == a2->session) ? GNUNET_YES : GNUNET_NO;
1644 * Try to create a connection to the given target (eventually).
1646 * @param target peer to try to connect to
1649 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
1651 struct NeighbourMapEntry *n;
1653 if (NULL == neighbours)
1654 return; /* during shutdown, do nothing */
1655 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1656 "Asked to connect to peer `%s'\n",
1657 GNUNET_i2s (target));
1659 memcmp (target, &GST_my_identity, sizeof (struct GNUNET_PeerIdentity)))
1661 /* refuse to connect to myself */
1662 /* FIXME: can this happen? Is this not an API violation? */
1663 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1664 "Refusing to try to connect to myself.\n");
1667 n = lookup_neighbour (target);
1672 case S_NOT_CONNECTED:
1673 /* this should not be possible */
1675 free_neighbour (n, GNUNET_NO);
1678 case S_INIT_BLACKLIST:
1679 case S_CONNECT_SENT:
1680 case S_CONNECT_RECV_BLACKLIST_INBOUND:
1681 case S_CONNECT_RECV_ATS:
1682 case S_CONNECT_RECV_BLACKLIST:
1683 case S_CONNECT_RECV_ACK:
1684 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1685 "Ignoring request to try to connect to `%s', already trying!\n",
1686 GNUNET_i2s (target));
1687 return; /* already trying */
1689 case S_RECONNECT_ATS:
1690 case S_RECONNECT_BLACKLIST:
1691 case S_RECONNECT_SENT:
1692 case S_CONNECTED_SWITCHING_BLACKLIST:
1693 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1694 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1695 "Ignoring request to try to connect, already connected to `%s'!\n",
1696 GNUNET_i2s (target));
1697 return; /* already connected */
1699 /* get rid of remains, ready to re-try immediately */
1700 free_neighbour (n, GNUNET_NO);
1702 case S_DISCONNECT_FINISHED:
1703 /* should not be possible */
1706 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1708 free_neighbour (n, GNUNET_NO);
1712 n = setup_neighbour (target);
1713 n->state = S_INIT_ATS;
1714 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1716 GNUNET_ATS_reset_backoff (GST_ats, target);
1717 GNUNET_ATS_suggest_address (GST_ats, target);
1722 * Function called with the result of a blacklist check.
1724 * @param cls closure with the 'struct BlackListCheckContext'
1725 * @param peer peer this check affects
1726 * @param result GNUNET_OK if the address is allowed
1729 handle_test_blacklist_cont (void *cls,
1730 const struct GNUNET_PeerIdentity *peer,
1733 struct BlackListCheckContext *bcc = cls;
1734 struct NeighbourMapEntry *n;
1737 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1738 "Connection to new address of peer `%s' based on blacklist is `%s'\n",
1740 (GNUNET_OK == result) ? "allowed" : "FORBIDDEN");
1741 if (NULL == (n = lookup_neighbour (peer)))
1742 goto cleanup; /* nobody left to care about new address */
1745 case S_NOT_CONNECTED:
1746 /* this should not be possible */
1748 free_neighbour (n, GNUNET_NO);
1751 /* still waiting on ATS suggestion */
1753 case S_INIT_BLACKLIST:
1754 /* check if the address the blacklist was fine with matches
1755 ATS suggestion, if so, we can move on! */
1756 if ( (GNUNET_OK == result) &&
1757 (1 == n->send_connect_ack) )
1759 n->send_connect_ack = 2;
1760 send_session_connect_ack_message (bcc->na.address,
1762 n->connect_ack_timestamp);
1764 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1765 break; /* result for an address we currently don't care about */
1766 if (GNUNET_OK == result)
1768 n->timeout = GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT);
1769 n->state = S_CONNECT_SENT;
1770 send_session_connect (&n->primary_address);
1774 // FIXME: should also possibly destroy session with plugin!?
1775 GNUNET_ATS_address_destroyed (GST_ats,
1778 free_address (&n->primary_address);
1779 n->state = S_INIT_ATS;
1780 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1781 // FIXME: do we need to ask ATS again for suggestions?
1782 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1785 case S_CONNECT_SENT:
1786 /* waiting on CONNECT_ACK, send ACK if one is pending */
1787 if ( (GNUNET_OK == result) &&
1788 (1 == n->send_connect_ack) )
1790 n->send_connect_ack = 2;
1791 send_session_connect_ack_message (n->primary_address.address,
1792 n->primary_address.session,
1793 n->connect_ack_timestamp);
1796 case S_CONNECT_RECV_BLACKLIST_INBOUND:
1797 if (GNUNET_OK == result)
1799 /* valid new address, let ATS know! */
1800 GNUNET_ATS_address_add (GST_ats,
1803 bcc->ats, bcc->ats_count);
1805 n->state = S_CONNECT_RECV_ATS;
1806 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1807 GNUNET_ATS_reset_backoff (GST_ats, peer);
1808 GNUNET_ATS_suggest_address (GST_ats, peer);
1810 case S_CONNECT_RECV_ATS:
1811 /* still waiting on ATS suggestion, don't care about blacklist */
1813 case S_CONNECT_RECV_BLACKLIST:
1814 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1815 break; /* result for an address we currently don't care about */
1816 if (GNUNET_OK == result)
1818 n->timeout = GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT);
1819 n->state = S_CONNECT_RECV_ACK;
1820 send_session_connect_ack_message (bcc->na.address,
1822 n->connect_ack_timestamp);
1823 if (1 == n->send_connect_ack)
1824 n->send_connect_ack = 2;
1828 // FIXME: should also possibly destroy session with plugin!?
1829 GNUNET_ATS_address_destroyed (GST_ats,
1832 free_address (&n->primary_address);
1833 n->state = S_INIT_ATS;
1834 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1835 // FIXME: do we need to ask ATS again for suggestions?
1836 GNUNET_ATS_reset_backoff (GST_ats, peer);
1837 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1840 case S_CONNECT_RECV_ACK:
1841 /* waiting on SESSION_ACK, send ACK if one is pending */
1842 if ( (GNUNET_OK == result) &&
1843 (1 == n->send_connect_ack) )
1845 n->send_connect_ack = 2;
1846 send_session_connect_ack_message (n->primary_address.address,
1847 n->primary_address.session,
1848 n->connect_ack_timestamp);
1852 /* already connected, don't care about blacklist */
1854 case S_RECONNECT_ATS:
1855 /* still waiting on ATS suggestion, don't care about blacklist */
1857 case S_RECONNECT_BLACKLIST:
1858 if ( (GNUNET_OK == result) &&
1859 (1 == n->send_connect_ack) )
1861 n->send_connect_ack = 2;
1862 send_session_connect_ack_message (bcc->na.address,
1864 n->connect_ack_timestamp);
1866 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1867 break; /* result for an address we currently don't care about */
1868 if (GNUNET_OK == result)
1870 send_session_connect (&n->primary_address);
1871 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
1872 n->state = S_RECONNECT_SENT;
1876 GNUNET_ATS_address_destroyed (GST_ats,
1879 n->state = S_RECONNECT_ATS;
1880 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1881 // FIXME: do we need to ask ATS again for suggestions?
1882 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1885 case S_RECONNECT_SENT:
1886 /* waiting on CONNECT_ACK, don't care about blacklist */
1887 if ( (GNUNET_OK == result) &&
1888 (1 == n->send_connect_ack) )
1890 n->send_connect_ack = 2;
1891 send_session_connect_ack_message (n->primary_address.address,
1892 n->primary_address.session,
1893 n->connect_ack_timestamp);
1896 case S_CONNECTED_SWITCHING_BLACKLIST:
1897 if (GNUNET_YES != address_matches (&bcc->na, &n->alternative_address))
1898 break; /* result for an address we currently don't care about */
1899 if (GNUNET_OK == result)
1901 send_session_connect (&n->alternative_address);
1902 n->state = S_CONNECTED_SWITCHING_CONNECT_SENT;
1906 GNUNET_ATS_address_destroyed (GST_ats,
1909 free_address (&n->alternative_address);
1910 n->state = S_CONNECTED;
1913 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1914 /* waiting on CONNECT_ACK, don't care about blacklist */
1915 if ( (GNUNET_OK == result) &&
1916 (1 == n->send_connect_ack) )
1918 n->send_connect_ack = 2;
1919 send_session_connect_ack_message (n->primary_address.address,
1920 n->primary_address.session,
1921 n->connect_ack_timestamp);
1925 /* Nothing to do here, ATS will already do what can be done */
1927 case S_DISCONNECT_FINISHED:
1928 /* should not be possible */
1932 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1934 free_neighbour (n, GNUNET_NO);
1938 GNUNET_HELLO_address_free (bcc->na.address);
1939 GNUNET_CONTAINER_DLL_remove (bc_head,
1947 * We want to know if connecting to a particular peer via
1948 * a particular address is allowed. Check it!
1950 * @param peer identity of the peer to switch the address for
1951 * @param ts time at which the check was initiated
1952 * @param address address of the other peer, NULL if other peer
1954 * @param session session to use (or NULL)
1955 * @param ats performance data
1956 * @param ats_count number of entries in ats (excluding 0-termination)
1959 check_blacklist (const struct GNUNET_PeerIdentity *peer,
1960 struct GNUNET_TIME_Absolute ts,
1961 const struct GNUNET_HELLO_Address *address,
1962 struct Session *session,
1963 const struct GNUNET_ATS_Information *ats,
1966 struct BlackListCheckContext *bcc;
1967 struct GST_BlacklistCheck *bc;
1970 GNUNET_malloc (sizeof (struct BlackListCheckContext) +
1971 sizeof (struct GNUNET_ATS_Information) * ats_count);
1972 bcc->ats_count = ats_count;
1973 bcc->na.address = GNUNET_HELLO_address_copy (address);
1974 bcc->na.session = session;
1975 bcc->na.connect_timestamp = ts;
1976 bcc->ats = (struct GNUNET_ATS_Information *) &bcc[1];
1977 memcpy (bcc->ats, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1978 GNUNET_CONTAINER_DLL_insert (bc_head,
1981 if (NULL != (bc = GST_blacklist_test_allowed (peer,
1982 address->transport_name,
1983 &handle_test_blacklist_cont, bcc)))
1985 /* if NULL == bc, 'cont' was already called and 'bcc' already free'd, so
1986 we must only store 'bc' if 'bc' is non-NULL... */
1991 * We received a 'SESSION_CONNECT' message from the other peer.
1992 * Consider switching to it.
1994 * @param message possibly a 'struct SessionConnectMessage' (check format)
1995 * @param peer identity of the peer to switch the address for
1996 * @param address address of the other peer, NULL if other peer
1998 * @param session session to use (or NULL)
1999 * @param ats performance data
2000 * @param ats_count number of entries in ats (excluding 0-termination)
2003 GST_neighbours_handle_connect (const struct GNUNET_MessageHeader *message,
2004 const struct GNUNET_PeerIdentity *peer,
2005 const struct GNUNET_HELLO_Address *address,
2006 struct Session *session,
2007 const struct GNUNET_ATS_Information *ats,
2010 const struct SessionConnectMessage *scm;
2011 struct NeighbourMapEntry *n;
2012 struct GNUNET_TIME_Absolute ts;
2014 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2015 "Received CONNECT message from peer `%s'\n",
2017 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2019 GNUNET_break_op (0);
2022 if (NULL == neighbours)
2023 return; /* we're shutting down */
2024 scm = (const struct SessionConnectMessage *) message;
2025 GNUNET_break_op (0 == ntohl (scm->reserved));
2026 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2027 n = lookup_neighbour (peer);
2029 n = setup_neighbour (peer);
2030 n->send_connect_ack = 1;
2031 n->connect_ack_timestamp = ts;
2034 case S_NOT_CONNECTED:
2035 n->state = S_CONNECT_RECV_BLACKLIST_INBOUND;
2036 /* Do a blacklist check for the new address */
2037 check_blacklist (peer, ts, address, session, ats, ats_count);
2040 case S_INIT_BLACKLIST:
2041 case S_CONNECT_SENT:
2042 case S_CONNECT_RECV_ATS:
2043 case S_CONNECT_RECV_BLACKLIST:
2044 case S_CONNECT_RECV_ACK:
2045 /* It can never hurt to have an alternative address in the above cases,
2046 see if it is allowed */
2047 check_blacklist (peer, ts, address, session, ats, ats_count);
2050 /* we are already connected and can thus send the ACK immediately;
2051 still, it can never hurt to have an alternative address, so also
2052 tell ATS about it */
2053 GNUNET_assert (NULL != n->primary_address.address);
2054 GNUNET_assert (NULL != n->primary_address.session);
2055 n->send_connect_ack = 0;
2056 send_session_connect_ack_message (n->primary_address.address,
2057 n->primary_address.session, ts);
2058 check_blacklist (peer, ts, address, session, ats, ats_count);
2060 case S_RECONNECT_ATS:
2061 case S_RECONNECT_BLACKLIST:
2062 case S_RECONNECT_SENT:
2063 /* It can never hurt to have an alternative address in the above cases,
2064 see if it is allowed */
2065 check_blacklist (peer, ts, address, session, ats, ats_count);
2067 case S_CONNECTED_SWITCHING_BLACKLIST:
2068 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2069 /* we are already connected and can thus send the ACK immediately;
2070 still, it can never hurt to have an alternative address, so also
2071 tell ATS about it */
2072 GNUNET_assert (NULL != n->primary_address.address);
2073 GNUNET_assert (NULL != n->primary_address.session);
2074 n->send_connect_ack = 0;
2075 send_session_connect_ack_message (n->primary_address.address,
2076 n->primary_address.session, ts);
2077 check_blacklist (peer, ts, address, session, ats, ats_count);
2080 /* get rid of remains without terminating sessions, ready to re-try */
2081 free_neighbour (n, GNUNET_YES);
2082 n = setup_neighbour (peer);
2083 n->state = S_CONNECT_RECV_ATS;
2084 GNUNET_ATS_reset_backoff (GST_ats, peer);
2085 GNUNET_ATS_suggest_address (GST_ats, peer);
2087 case S_DISCONNECT_FINISHED:
2088 /* should not be possible */
2092 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2094 free_neighbour (n, GNUNET_NO);
2101 * For an existing neighbour record, set the active connection to
2102 * use the given address.
2104 * @param peer identity of the peer to switch the address for
2105 * @param address address of the other peer, NULL if other peer
2107 * @param session session to use (or NULL)
2108 * @param ats performance data
2109 * @param ats_count number of entries in ats
2110 * @param bandwidth_in inbound quota to be used when connection is up
2111 * @param bandwidth_out outbound quota to be used when connection is up
2114 GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
2115 const struct GNUNET_HELLO_Address *address,
2116 struct Session *session,
2117 const struct GNUNET_ATS_Information *ats,
2119 struct GNUNET_BANDWIDTH_Value32NBO
2121 struct GNUNET_BANDWIDTH_Value32NBO
2124 struct NeighbourMapEntry *n;
2125 struct GNUNET_TRANSPORT_PluginFunctions *papi;
2127 GNUNET_assert (address->transport_name != NULL);
2128 if (NULL == (n = lookup_neighbour (peer)))
2131 /* Obtain an session for this address from plugin */
2132 if (NULL == (papi = GST_plugins_find (address->transport_name)))
2134 /* we don't have the plugin for this address */
2135 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2138 if ((NULL == session) && (0 == address->address_length))
2141 if (strlen (address->transport_name) > 0)
2142 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2145 if (NULL == session)
2146 session = papi->get_session (papi->cls, address);
2147 if (NULL == session)
2149 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2150 "Failed to obtain new session for peer `%s' and address '%s'\n",
2151 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
2152 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2155 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2156 "ATS tells us to switch to address '%s' for peer `%s'\n",
2157 (address->address_length != 0) ? GST_plugins_a2s (address): "<inbound>",
2161 case S_NOT_CONNECTED:
2163 free_neighbour (n, GNUNET_NO);
2166 set_address (&n->primary_address,
2167 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2168 n->state = S_INIT_BLACKLIST;
2169 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2170 check_blacklist (&n->id,
2171 n->connect_ack_timestamp,
2172 address, session, ats, ats_count);
2174 case S_INIT_BLACKLIST:
2175 /* ATS suggests a different address, switch again */
2176 set_address (&n->primary_address,
2177 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2178 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2179 check_blacklist (&n->id,
2180 n->connect_ack_timestamp,
2181 address, session, ats, ats_count);
2183 case S_CONNECT_SENT:
2184 /* ATS suggests a different address, switch again */
2185 set_address (&n->primary_address,
2186 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2187 n->state = S_INIT_BLACKLIST;
2188 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2189 check_blacklist (&n->id,
2190 n->connect_ack_timestamp,
2191 address, session, ats, ats_count);
2193 case S_CONNECT_RECV_ATS:
2194 set_address (&n->primary_address,
2195 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2196 n->state = S_CONNECT_RECV_BLACKLIST;
2197 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2198 check_blacklist (&n->id,
2199 n->connect_ack_timestamp,
2200 address, session, ats, ats_count);
2202 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2203 case S_CONNECT_RECV_BLACKLIST:
2204 case S_CONNECT_RECV_ACK:
2205 /* ATS asks us to switch while we were trying to connect; switch to new
2206 address and check blacklist again */
2207 set_address (&n->primary_address,
2208 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2209 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2210 check_blacklist (&n->id,
2211 n->connect_ack_timestamp,
2212 address, session, ats, ats_count);
2215 GNUNET_assert (NULL != n->primary_address.address);
2216 GNUNET_assert (NULL != n->primary_address.session);
2217 if (n->primary_address.session == session)
2219 /* not an address change, just a quota change */
2220 set_address (&n->primary_address,
2221 address, session, bandwidth_in, bandwidth_out, GNUNET_YES);
2224 /* ATS asks us to switch a life connection; see if we can get
2225 a CONNECT_ACK on it before we actually do this! */
2226 set_address (&n->alternative_address,
2227 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2228 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2229 check_blacklist (&n->id,
2230 GNUNET_TIME_absolute_get (),
2231 address, session, ats, ats_count);
2233 case S_RECONNECT_ATS:
2234 set_address (&n->primary_address,
2235 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2236 n->state = S_RECONNECT_BLACKLIST;
2237 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2238 check_blacklist (&n->id,
2239 n->connect_ack_timestamp,
2240 address, session, ats, ats_count);
2242 case S_RECONNECT_BLACKLIST:
2243 /* ATS asks us to switch while we were trying to reconnect; switch to new
2244 address and check blacklist again */
2245 set_address (&n->primary_address,
2246 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2247 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2248 check_blacklist (&n->id,
2249 n->connect_ack_timestamp,
2250 address, session, ats, ats_count);
2252 case S_RECONNECT_SENT:
2253 /* ATS asks us to switch while we were trying to reconnect; switch to new
2254 address and check blacklist again */
2255 set_address (&n->primary_address,
2256 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2257 n->state = S_RECONNECT_BLACKLIST;
2258 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2259 check_blacklist (&n->id,
2260 n->connect_ack_timestamp,
2261 address, session, ats, ats_count);
2263 case S_CONNECTED_SWITCHING_BLACKLIST:
2264 if (n->primary_address.session == session)
2266 /* ATS switches back to still-active session */
2267 free_address (&n->alternative_address);
2268 n->state = S_CONNECTED;
2271 /* ATS asks us to switch a life connection, update blacklist check */
2272 set_address (&n->alternative_address,
2273 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2274 check_blacklist (&n->id,
2275 GNUNET_TIME_absolute_get (),
2276 address, session, ats, ats_count);
2278 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2279 if (n->primary_address.session == session)
2281 /* ATS switches back to still-active session */
2282 free_address (&n->alternative_address);
2283 n->state = S_CONNECTED;
2286 /* ATS asks us to switch a life connection, update blacklist check */
2287 set_address (&n->alternative_address,
2288 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2289 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2290 check_blacklist (&n->id,
2291 GNUNET_TIME_absolute_get (),
2292 address, session, ats, ats_count);
2295 /* not going to switch addresses while disconnecting */
2297 case S_DISCONNECT_FINISHED:
2301 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2309 * Master task run for every neighbour. Performs all of the time-related
2310 * activities (keep alive, send next message, disconnect if idle, finish
2311 * clean up after disconnect).
2313 * @param cls the 'struct NeighbourMapEntry' for which we are running
2314 * @param tc scheduler context (unused)
2317 master_task (void *cls,
2318 const struct GNUNET_SCHEDULER_TaskContext *tc)
2320 struct NeighbourMapEntry *n = cls;
2321 struct GNUNET_TIME_Relative delay;
2323 n->task = GNUNET_SCHEDULER_NO_TASK;
2324 delay = GNUNET_TIME_absolute_get_remaining (n->timeout);
2325 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2326 "master task runs for neighbour `%s' in state %d with timeout in %llu ms\n",
2327 GNUNET_i2s (&n->id),
2329 (unsigned long long) delay.rel_value);
2332 case S_NOT_CONNECTED:
2333 /* invalid state for master task, clean up */
2335 n->state = S_DISCONNECT_FINISHED;
2336 free_neighbour (n, GNUNET_NO);
2339 if (0 == delay.rel_value)
2341 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2342 "Connection to `%s' timed out waiting for ATS to provide address\n",
2343 GNUNET_i2s (&n->id));
2344 n->state = S_DISCONNECT_FINISHED;
2345 free_neighbour (n, GNUNET_NO);
2349 case S_INIT_BLACKLIST:
2350 if (0 == delay.rel_value)
2352 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2353 "Connection to `%s' timed out waiting for BLACKLIST to approve address\n",
2354 GNUNET_i2s (&n->id));
2355 n->state = S_DISCONNECT_FINISHED;
2356 free_neighbour (n, GNUNET_NO);
2360 case S_CONNECT_SENT:
2361 if (0 == delay.rel_value)
2363 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2364 "Connection to `%s' timed out waiting for other peer to send CONNECT_ACK\n",
2365 GNUNET_i2s (&n->id));
2366 disconnect_neighbour (n);
2370 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2371 if (0 == delay.rel_value)
2373 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2374 "Connection to `%s' timed out waiting BLACKLIST to approve address to use for received CONNECT\n",
2375 GNUNET_i2s (&n->id));
2376 n->state = S_DISCONNECT_FINISHED;
2377 free_neighbour (n, GNUNET_NO);
2381 case S_CONNECT_RECV_ATS:
2382 if (0 == delay.rel_value)
2384 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2385 "Connection to `%s' timed out waiting ATS to provide address to use for CONNECT_ACK\n",
2386 GNUNET_i2s (&n->id));
2387 n->state = S_DISCONNECT_FINISHED;
2388 free_neighbour (n, GNUNET_NO);
2392 case S_CONNECT_RECV_BLACKLIST:
2393 if (0 == delay.rel_value)
2395 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2396 "Connection to `%s' timed out waiting BLACKLIST to approve address to use for CONNECT_ACK\n",
2397 GNUNET_i2s (&n->id));
2398 n->state = S_DISCONNECT_FINISHED;
2399 free_neighbour (n, GNUNET_NO);
2403 case S_CONNECT_RECV_ACK:
2404 if (0 == delay.rel_value)
2406 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2407 "Connection to `%s' timed out waiting for other peer to send SESSION_ACK\n",
2408 GNUNET_i2s (&n->id));
2409 disconnect_neighbour (n);
2414 if (0 == delay.rel_value)
2416 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2417 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2418 GNUNET_i2s (&n->id));
2419 disconnect_neighbour (n);
2422 try_transmission_to_peer (n);
2425 case S_RECONNECT_ATS:
2426 if (0 == delay.rel_value)
2428 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2429 "Connection to `%s' timed out, waiting for ATS replacement address\n",
2430 GNUNET_i2s (&n->id));
2431 disconnect_neighbour (n);
2435 case S_RECONNECT_BLACKLIST:
2436 if (0 == delay.rel_value)
2438 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2439 "Connection to `%s' timed out, waiting for BLACKLIST to approve replacement address\n",
2440 GNUNET_i2s (&n->id));
2441 disconnect_neighbour (n);
2445 case S_RECONNECT_SENT:
2446 if (0 == delay.rel_value)
2448 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2449 "Connection to `%s' timed out, waiting for other peer to CONNECT_ACK replacement address\n",
2450 GNUNET_i2s (&n->id));
2451 disconnect_neighbour (n);
2455 case S_CONNECTED_SWITCHING_BLACKLIST:
2456 if (0 == delay.rel_value)
2458 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2459 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2460 GNUNET_i2s (&n->id));
2461 disconnect_neighbour (n);
2464 try_transmission_to_peer (n);
2467 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2468 if (0 == delay.rel_value)
2470 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2471 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs (after trying to CONNECT on alternative address)\n",
2472 GNUNET_i2s (&n->id));
2473 disconnect_neighbour (n);
2476 try_transmission_to_peer (n);
2480 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2481 "Cleaning up connection to `%s' after sending DISCONNECT\n",
2482 GNUNET_i2s (&n->id));
2483 n->state = S_DISCONNECT_FINISHED;
2484 free_neighbour (n, GNUNET_NO);
2486 case S_DISCONNECT_FINISHED:
2487 /* how did we get here!? */
2491 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2495 if ( (S_CONNECTED_SWITCHING_CONNECT_SENT == n->state) ||
2496 (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
2497 (S_CONNECTED == n->state) )
2499 /* if we are *now* in one of these three states, we're sending
2500 keep alive messages, so we need to consider the keepalive
2501 delay, not just the connection timeout */
2502 delay = GNUNET_TIME_relative_min (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time),
2505 if (GNUNET_SCHEDULER_NO_TASK == n->task)
2506 n->task = GNUNET_SCHEDULER_add_delayed (delay,
2513 * Send a SESSION_ACK message to the neighbour to confirm that we
2514 * got his CONNECT_ACK.
2516 * @param n neighbour to send the SESSION_ACK to
2519 send_session_ack_message (struct NeighbourMapEntry *n)
2521 struct GNUNET_MessageHeader msg;
2523 msg.size = htons (sizeof (struct GNUNET_MessageHeader));
2524 msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK);
2525 (void) send_with_session(n,
2526 (const char *) &msg, sizeof (struct GNUNET_MessageHeader),
2527 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
2533 * We received a 'SESSION_CONNECT_ACK' message from the other peer.
2534 * Consider switching to it.
2536 * @param message possibly a 'struct SessionConnectMessage' (check format)
2537 * @param peer identity of the peer to switch the address for
2538 * @param address address of the other peer, NULL if other peer
2540 * @param session session to use (or NULL)
2541 * @param ats performance data
2542 * @param ats_count number of entries in ats
2545 GST_neighbours_handle_connect_ack (const struct GNUNET_MessageHeader *message,
2546 const struct GNUNET_PeerIdentity *peer,
2547 const struct GNUNET_HELLO_Address *address,
2548 struct Session *session,
2549 const struct GNUNET_ATS_Information *ats,
2552 const struct SessionConnectMessage *scm;
2553 struct GNUNET_TIME_Absolute ts;
2554 struct NeighbourMapEntry *n;
2556 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2557 "Received CONNECT_ACK message from peer `%s'\n",
2559 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2561 GNUNET_break_op (0);
2564 scm = (const struct SessionConnectMessage *) message;
2565 GNUNET_break_op (ntohl (scm->reserved) == 0);
2566 if (NULL == (n = lookup_neighbour (peer)))
2568 GNUNET_STATISTICS_update (GST_stats,
2570 ("# unexpected CONNECT_ACK messages (no peer)"),
2574 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2577 case S_NOT_CONNECTED:
2579 free_neighbour (n, GNUNET_NO);
2582 case S_INIT_BLACKLIST:
2583 GNUNET_STATISTICS_update (GST_stats,
2585 ("# unexpected CONNECT_ACK messages (not ready)"),
2588 case S_CONNECT_SENT:
2589 if (ts.abs_value != n->primary_address.connect_timestamp.abs_value)
2590 break; /* ACK does not match our original CONNECT message */
2591 n->state = S_CONNECTED;
2592 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2593 GNUNET_STATISTICS_set (GST_stats,
2594 gettext_noop ("# peers connected"),
2595 ++neighbours_connected,
2597 connect_notify_cb (callback_cls, &n->id, ats, ats_count);
2598 set_address (&n->primary_address,
2599 n->primary_address.address,
2600 n->primary_address.session,
2601 n->primary_address.bandwidth_in,
2602 n->primary_address.bandwidth_out,
2604 send_session_ack_message (n);
2606 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2607 case S_CONNECT_RECV_ATS:
2608 case S_CONNECT_RECV_BLACKLIST:
2609 case S_CONNECT_RECV_ACK:
2610 GNUNET_STATISTICS_update (GST_stats,
2612 ("# unexpected CONNECT_ACK messages (not ready)"),
2616 /* duplicate CONNECT_ACK, let's answer by duplciate SESSION_ACK just in case */
2617 send_session_ack_message (n);
2619 case S_RECONNECT_ATS:
2620 case S_RECONNECT_BLACKLIST:
2621 /* we didn't expect any CONNECT_ACK, as we are waiting for ATS
2622 to give us a new address... */
2623 GNUNET_STATISTICS_update (GST_stats,
2625 ("# unexpected CONNECT_ACK messages (waiting on ATS)"),
2628 case S_RECONNECT_SENT:
2629 /* new address worked; go back to connected! */
2630 n->state = S_CONNECTED;
2631 send_session_ack_message (n);
2633 case S_CONNECTED_SWITCHING_BLACKLIST:
2634 /* duplicate CONNECT_ACK, let's answer by duplciate SESSION_ACK just in case */
2635 send_session_ack_message (n);
2637 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2638 /* new address worked; adopt it and go back to connected! */
2639 n->state = S_CONNECTED;
2640 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2641 GNUNET_break (GNUNET_NO == n->alternative_address.ats_active);
2642 set_address (&n->primary_address,
2643 n->alternative_address.address,
2644 n->alternative_address.session,
2645 n->alternative_address.bandwidth_in,
2646 n->alternative_address.bandwidth_out,
2648 free_address (&n->alternative_address);
2649 send_session_ack_message (n);
2652 GNUNET_STATISTICS_update (GST_stats,
2654 ("# unexpected CONNECT_ACK messages (disconnecting)"),
2657 case S_DISCONNECT_FINISHED:
2661 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2669 * A session was terminated. Take note; if needed, try to get
2670 * an alternative address from ATS.
2672 * @param peer identity of the peer where the session died
2673 * @param session session that is gone
2676 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
2677 struct Session *session)
2679 struct NeighbourMapEntry *n;
2680 struct BlackListCheckContext *bcc;
2681 struct BlackListCheckContext *bcc_next;
2683 /* make sure to cancel all ongoing blacklist checks involving 'session' */
2685 while (NULL != (bcc = bcc_next))
2687 bcc_next = bcc->next;
2688 if (bcc->na.session == session)
2690 GST_blacklist_test_cancel (bcc->bc);
2691 GNUNET_HELLO_address_free (bcc->na.address);
2692 GNUNET_CONTAINER_DLL_remove (bc_head,
2698 if (NULL == (n = lookup_neighbour (peer)))
2699 return; /* can't affect us */
2700 if (session != n->primary_address.session)
2702 if (session == n->alternative_address.session)
2704 free_address (&n->alternative_address);
2705 if ( (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
2706 (S_CONNECTED_SWITCHING_CONNECT_SENT == n->state) )
2707 n->state = S_CONNECTED;
2711 return; /* doesn't affect us further */
2714 n->expect_latency_response = GNUNET_NO;
2718 case S_NOT_CONNECTED:
2720 free_neighbour (n, GNUNET_NO);
2724 free_neighbour (n, GNUNET_NO);
2726 case S_INIT_BLACKLIST:
2727 case S_CONNECT_SENT:
2728 free_address (&n->primary_address);
2729 n->state = S_INIT_ATS;
2730 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2731 // FIXME: need to ask ATS for suggestions again?
2732 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2734 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2735 case S_CONNECT_RECV_ATS:
2736 case S_CONNECT_RECV_BLACKLIST:
2737 case S_CONNECT_RECV_ACK:
2738 /* error on inbound session; free neighbour entirely */
2739 free_address (&n->primary_address);
2740 free_neighbour (n, GNUNET_NO);
2743 free_address (&n->primary_address);
2744 n->state = S_RECONNECT_ATS;
2745 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2746 /* FIXME: is this ATS call needed? */
2747 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2749 case S_RECONNECT_ATS:
2750 /* we don't have an address, how can it go down? */
2753 case S_RECONNECT_BLACKLIST:
2754 case S_RECONNECT_SENT:
2755 n->state = S_RECONNECT_ATS;
2756 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2757 // FIXME: need to ask ATS for suggestions again?
2758 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2760 case S_CONNECTED_SWITCHING_BLACKLIST:
2761 /* primary went down while we were checking secondary against
2762 blacklist, adopt secondary as primary */
2763 free_address (&n->primary_address);
2764 n->primary_address = n->alternative_address;
2765 memset (&n->alternative_address, 0, sizeof (struct NeighbourAddress));
2766 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
2767 n->state = S_RECONNECT_BLACKLIST;
2769 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2770 /* primary went down while we were waiting for CONNECT_ACK on secondary;
2771 secondary as primary */
2772 free_address (&n->primary_address);
2773 n->primary_address = n->alternative_address;
2774 memset (&n->alternative_address, 0, sizeof (struct NeighbourAddress));
2775 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
2776 n->state = S_RECONNECT_SENT;
2779 free_address (&n->primary_address);
2781 case S_DISCONNECT_FINISHED:
2782 /* neighbour was freed and plugins told to terminate session */
2785 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2789 if (GNUNET_SCHEDULER_NO_TASK != n->task)
2790 GNUNET_SCHEDULER_cancel (n->task);
2791 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
2796 * We received a 'SESSION_ACK' message from the other peer.
2797 * If we sent a 'CONNECT_ACK' last, this means we are now
2798 * connected. Otherwise, do nothing.
2800 * @param message possibly a 'struct SessionConnectMessage' (check format)
2801 * @param peer identity of the peer to switch the address for
2802 * @param address address of the other peer, NULL if other peer
2804 * @param session session to use (or NULL)
2805 * @param ats performance data
2806 * @param ats_count number of entries in ats
2809 GST_neighbours_handle_session_ack (const struct GNUNET_MessageHeader *message,
2810 const struct GNUNET_PeerIdentity *peer,
2811 const struct GNUNET_HELLO_Address *address,
2812 struct Session *session,
2813 const struct GNUNET_ATS_Information *ats,
2816 struct NeighbourMapEntry *n;
2818 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2819 "Received SESSION_ACK message from peer `%s'\n",
2821 if (ntohs (message->size) != sizeof (struct GNUNET_MessageHeader))
2823 GNUNET_break_op (0);
2826 if (NULL == (n = lookup_neighbour (peer)))
2828 /* check if we are in a plausible state for having sent
2829 a CONNECT_ACK. If not, return, otherwise break */
2830 if ( ( (S_CONNECT_RECV_ACK != n->state) &&
2831 (S_CONNECT_SENT != n->state) ) ||
2832 (2 != n->send_connect_ack) )
2834 GNUNET_STATISTICS_update (GST_stats,
2835 gettext_noop ("# unexpected SESSION ACK messages"), 1,
2839 n->state = S_CONNECTED;
2840 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2841 GNUNET_STATISTICS_set (GST_stats,
2842 gettext_noop ("# peers connected"),
2843 ++neighbours_connected,
2845 connect_notify_cb (callback_cls, &n->id, ats, ats_count);
2846 set_address (&n->primary_address,
2847 n->primary_address.address,
2848 n->primary_address.session,
2849 n->primary_address.bandwidth_in,
2850 n->primary_address.bandwidth_out,
2856 * Test if we're connected to the given peer.
2858 * @param target peer to test
2859 * @return GNUNET_YES if we are connected, GNUNET_NO if not
2862 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
2864 return test_connected (lookup_neighbour (target));
2869 * Change the incoming quota for the given peer.
2871 * @param neighbour identity of peer to change qutoa for
2872 * @param quota new quota
2875 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
2876 struct GNUNET_BANDWIDTH_Value32NBO quota)
2878 struct NeighbourMapEntry *n;
2880 if (NULL == (n = lookup_neighbour (neighbour)))
2882 GNUNET_STATISTICS_update (GST_stats,
2884 ("# SET QUOTA messages ignored (no such peer)"),
2888 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2889 "Setting inbound quota of %u Bps for peer `%s' to all clients\n",
2890 ntohl (quota.value__), GNUNET_i2s (&n->id));
2891 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
2892 if (0 != ntohl (quota.value__))
2894 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
2895 GNUNET_i2s (&n->id), "SET_QUOTA");
2896 if (GNUNET_YES == test_connected (n))
2897 GNUNET_STATISTICS_update (GST_stats,
2898 gettext_noop ("# disconnects due to quota of 0"),
2900 disconnect_neighbour (n);
2905 * We received a disconnect message from the given peer,
2906 * validate and process.
2908 * @param peer sender of the message
2909 * @param msg the disconnect message
2912 GST_neighbours_handle_disconnect_message (const struct GNUNET_PeerIdentity
2914 const struct GNUNET_MessageHeader
2917 struct NeighbourMapEntry *n;
2918 const struct SessionDisconnectMessage *sdm;
2919 struct GNUNET_HashCode hc;
2921 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2922 "Received DISCONNECT message from peer `%s'\n",
2924 if (ntohs (msg->size) != sizeof (struct SessionDisconnectMessage))
2926 // GNUNET_break_op (0);
2927 GNUNET_STATISTICS_update (GST_stats,
2929 ("# disconnect messages ignored (old format)"), 1,
2933 sdm = (const struct SessionDisconnectMessage *) msg;
2934 if (NULL == (n = lookup_neighbour (peer)))
2935 return; /* gone already */
2936 if (GNUNET_TIME_absolute_ntoh (sdm->timestamp).abs_value <= n->connect_ack_timestamp.abs_value)
2938 GNUNET_STATISTICS_update (GST_stats,
2940 ("# disconnect messages ignored (timestamp)"), 1,
2944 GNUNET_CRYPTO_hash (&sdm->public_key,
2945 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2947 if (0 != memcmp (peer, &hc, sizeof (struct GNUNET_PeerIdentity)))
2949 GNUNET_break_op (0);
2952 if (ntohl (sdm->purpose.size) !=
2953 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2954 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
2955 sizeof (struct GNUNET_TIME_AbsoluteNBO))
2957 GNUNET_break_op (0);
2961 GNUNET_CRYPTO_rsa_verify
2962 (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT, &sdm->purpose,
2963 &sdm->signature, &sdm->public_key))
2965 GNUNET_break_op (0);
2968 if (GNUNET_YES == test_connected (n))
2969 GNUNET_STATISTICS_update (GST_stats,
2971 ("# other peer asked to disconnect from us"), 1,
2973 disconnect_neighbour (n);
2978 * Closure for the neighbours_iterate function.
2980 struct IteratorContext
2983 * Function to call on each connected neighbour.
2985 GST_NeighbourIterator cb;
2995 * Call the callback from the closure for each connected neighbour.
2997 * @param cls the 'struct IteratorContext'
2998 * @param key the hash of the public key of the neighbour
2999 * @param value the 'struct NeighbourMapEntry'
3000 * @return GNUNET_OK (continue to iterate)
3003 neighbours_iterate (void *cls, const struct GNUNET_HashCode * key, void *value)
3005 struct IteratorContext *ic = cls;
3006 struct NeighbourMapEntry *n = value;
3008 if (GNUNET_YES == test_connected (n))
3009 ic->cb (ic->cb_cls, &n->id, NULL, 0, n->primary_address.address);
3015 * Iterate over all connected neighbours.
3017 * @param cb function to call
3018 * @param cb_cls closure for cb
3021 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
3023 struct IteratorContext ic;
3025 if (NULL == neighbours)
3026 return; /* can happen during shutdown */
3029 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
3034 * If we have an active connection to the given target, it must be shutdown.
3036 * @param target peer to disconnect from
3039 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
3041 struct NeighbourMapEntry *n;
3043 if (NULL == (n = lookup_neighbour (target)))
3044 return; /* not active */
3045 if (GNUNET_YES == test_connected (n))
3046 GNUNET_STATISTICS_update (GST_stats,
3048 ("# disconnected from peer upon explicit request"), 1,
3050 disconnect_neighbour (n);
3055 * Obtain current latency information for the given neighbour.
3057 * @param peer to get the latency for
3058 * @return observed latency of the address, FOREVER if the
3059 * the connection is not up
3061 struct GNUNET_TIME_Relative
3062 GST_neighbour_get_latency (const struct GNUNET_PeerIdentity *peer)
3064 struct NeighbourMapEntry *n;
3066 n = lookup_neighbour (peer);
3068 return GNUNET_TIME_UNIT_FOREVER_REL;
3072 case S_RECONNECT_SENT:
3073 case S_RECONNECT_ATS:
3075 case S_NOT_CONNECTED:
3076 case S_INIT_BLACKLIST:
3078 case S_CONNECT_RECV_BLACKLIST_INBOUND:
3079 case S_CONNECT_SENT:
3080 case S_CONNECT_RECV_BLACKLIST:
3082 case S_DISCONNECT_FINISHED:
3083 return GNUNET_TIME_UNIT_FOREVER_REL;
3085 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
3089 return GNUNET_TIME_UNIT_FOREVER_REL;
3094 * Obtain current address information for the given neighbour.
3097 * @return address currently used
3099 struct GNUNET_HELLO_Address *
3100 GST_neighbour_get_current_address (const struct GNUNET_PeerIdentity *peer)
3102 struct NeighbourMapEntry *n;
3104 n = lookup_neighbour (peer);
3107 return n->primary_address.address;
3112 * Initialize the neighbours subsystem.
3114 * @param cls closure for callbacks
3115 * @param connect_cb function to call if we connect to a peer
3116 * @param disconnect_cb function to call if we disconnect from a peer
3117 * @param peer_address_cb function to call if we change an active address
3121 GST_neighbours_start (void *cls,
3122 GNUNET_TRANSPORT_NotifyConnect connect_cb,
3123 GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb,
3124 GNUNET_TRANSPORT_PeerIterateCallback peer_address_cb)
3127 connect_notify_cb = connect_cb;
3128 disconnect_notify_cb = disconnect_cb;
3129 address_change_cb = peer_address_cb;
3130 neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE);
3135 * Disconnect from the given neighbour.
3138 * @param key hash of neighbour's public key (not used)
3139 * @param value the 'struct NeighbourMapEntry' of the neighbour
3140 * @return GNUNET_OK (continue to iterate)
3143 disconnect_all_neighbours (void *cls, const struct GNUNET_HashCode * key, void *value)
3145 struct NeighbourMapEntry *n = value;
3147 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3148 "Disconnecting peer `%4s', %s\n",
3149 GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
3150 n->state = S_DISCONNECT_FINISHED;
3151 free_neighbour (n, GNUNET_NO);
3157 * Cleanup the neighbours subsystem.
3160 GST_neighbours_stop ()
3162 if (NULL == neighbours)
3164 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
3165 &disconnect_all_neighbours,
3167 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
3169 callback_cls = NULL;
3170 connect_notify_cb = NULL;
3171 disconnect_notify_cb = NULL;
3172 address_change_cb = NULL;
3176 /* end of file gnunet-service-transport_neighbours.c */