2 This file is part of GNUnet.
3 (C) 2010,2011,2012 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
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 and ask ATS for a
225 * suggestion. (S_CONNECT_RECV_ATS). If the blacklist comes back
226 * positive, we give the address to ATS. If ATS makes a suggestion,
227 * 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, asking ATS about address suggestions.
310 * Received CONNECT from other peer, got an address, checking with blacklist.
312 S_CONNECT_RECV_BLACKLIST,
315 * CONNECT request from other peer was SESSION_ACK'ed, waiting for
321 * Got our CONNECT_ACK/SESSION_ACK, connection is up.
326 * Connection got into trouble, rest of the system still believes
327 * it to be up, but we're getting a new address from ATS.
332 * Connection got into trouble, rest of the system still believes
333 * it to be up; we are checking the new address against the blacklist.
335 S_RECONNECT_BLACKLIST,
338 * Sent CONNECT over new address (either by ATS telling us to switch
339 * addresses or from RECONNECT_ATS); if this fails, we need to tell
340 * the rest of the system about a disconnect.
345 * We have some primary connection, but ATS suggested we switch
346 * to some alternative; we're now checking the alternative against
349 S_CONNECTED_SWITCHING_BLACKLIST,
352 * We have some primary connection, but ATS suggested we switch
353 * to some alternative; we now sent a CONNECT message for the
354 * alternative session to the other peer and waiting for a
355 * CONNECT_ACK to make this our primary connection.
357 S_CONNECTED_SWITCHING_CONNECT_SENT,
360 * Disconnect in progress (we're sending the DISCONNECT message to the
361 * other peer; after that is finished, the state will be cleaned up).
366 * We're finished with the disconnect; clean up state now!
368 S_DISCONNECT_FINISHED
373 * A possible address we could use to communicate with a neighbour.
375 struct NeighbourAddress
379 * Active session for this address.
381 struct Session *session;
384 * Network-level address information.
386 struct GNUNET_HELLO_Address *address;
389 * Timestamp of the 'SESSION_CONNECT' message we sent to the other
390 * peer for this address. Use to check that the ACK is in response
391 * to our most recent 'CONNECT'.
393 struct GNUNET_TIME_Absolute connect_timestamp;
396 * Inbound bandwidth from ATS for this address.
398 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in;
401 * Outbound bandwidth from ATS for this address.
403 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out;
406 * Did we tell ATS that this is our 'active' address?
414 * Entry in neighbours.
416 struct NeighbourMapEntry
420 * Head of list of messages we would like to send to this peer;
421 * must contain at most one message per client.
423 struct MessageQueue *messages_head;
426 * Tail of list of messages we would like to send to this peer; must
427 * contain at most one message per client.
429 struct MessageQueue *messages_tail;
432 * Are we currently trying to send a message? If so, which one?
434 struct MessageQueue *is_active;
437 * Primary address we currently use to communicate with the neighbour.
439 struct NeighbourAddress primary_address;
442 * Alternative address currently under consideration for communicating
443 * with the neighbour.
445 struct NeighbourAddress alternative_address;
448 * Identity of this neighbour.
450 struct GNUNET_PeerIdentity id;
453 * Main task that drives this peer (timeouts, keepalives, etc.).
454 * Always runs the 'master_task'.
456 GNUNET_SCHEDULER_TaskIdentifier task;
459 * At what time should we sent the next keep-alive message?
461 struct GNUNET_TIME_Absolute keep_alive_time;
464 * At what time did we sent the last keep-alive message? Used
465 * to calculate round-trip time ("latency").
467 struct GNUNET_TIME_Absolute last_keep_alive_time;
470 * Timestamp we should include in our next CONNECT_ACK message.
471 * (only valid if 'send_connect_ack' is GNUNET_YES). Used to build
472 * our CONNECT_ACK message.
474 struct GNUNET_TIME_Absolute connect_ack_timestamp;
477 * Time where we should cut the connection (timeout) if we don't
478 * make progress in the state machine (or get a KEEPALIVE_RESPONSE
479 * if we are in S_CONNECTED).
481 struct GNUNET_TIME_Absolute timeout;
484 * Latest calculated latency value
486 struct GNUNET_TIME_Relative latency;
489 * Tracker for inbound bandwidth.
491 struct GNUNET_BANDWIDTH_Tracker in_tracker;
494 * How often has the other peer (recently) violated the inbound
495 * traffic limit? Incremented by 10 per violation, decremented by 1
496 * per non-violation (for each time interval).
498 unsigned int quota_violation_count;
501 * The current state of the peer.
506 * Did we sent an KEEP_ALIVE message and are we expecting a response?
508 int expect_latency_response;
511 * Flag to set if we still need to send a CONNECT_ACK message to the other peer
512 * (once we have an address to use and the peer has been allowed by our
513 * blacklist). Set to 1 if we need to send a CONNECT_ACK. Set to 2 if we
514 * did send a CONNECT_ACK and should go to 'S_CONNECTED' upon receiving
515 * a 'SESSION_ACK' (regardless of what our own state machine might say).
517 int send_connect_ack;
523 * Context for blacklist checks and the 'handle_test_blacklist_cont'
524 * function. Stores information about ongoing blacklist checks.
526 struct BlackListCheckContext
530 * We keep blacklist checks in a DLL.
532 struct BlackListCheckContext *next;
535 * We keep blacklist checks in a DLL.
537 struct BlackListCheckContext *prev;
540 * Address that is being checked.
542 struct NeighbourAddress na;
545 * ATS information about the address.
547 struct GNUNET_ATS_Information *ats;
550 * Handle to the ongoing blacklist check.
552 struct GST_BlacklistCheck *bc;
555 * Size of the 'ats' array.
563 * Hash map from peer identities to the respective 'struct NeighbourMapEntry'.
565 static struct GNUNET_CONTAINER_MultiHashMap *neighbours;
568 * We keep blacklist checks in a DLL so that we can find
569 * the 'sessions' in their 'struct NeighbourAddress' if
570 * a session goes down.
572 static struct BlackListCheckContext *bc_head;
575 * We keep blacklist checks in a DLL.
577 static struct BlackListCheckContext *bc_tail;
580 * Closure for connect_notify_cb, disconnect_notify_cb and address_change_cb
582 static void *callback_cls;
585 * Function to call when we connected to a neighbour.
587 static GNUNET_TRANSPORT_NotifyConnect connect_notify_cb;
590 * Function to call when we disconnected from a neighbour.
592 static GNUNET_TRANSPORT_NotifyDisconnect disconnect_notify_cb;
595 * Function to call when we changed an active address of a neighbour.
597 static GNUNET_TRANSPORT_PeerIterateCallback address_change_cb;
600 * counter for connected neighbours
602 static unsigned int neighbours_connected;
605 * Number of bytes we have currently queued for transmission.
607 static unsigned long long bytes_in_send_queue;
611 * Lookup a neighbour entry in the neighbours hash map.
613 * @param pid identity of the peer to look up
614 * @return the entry, NULL if there is no existing record
616 static struct NeighbourMapEntry *
617 lookup_neighbour (const struct GNUNET_PeerIdentity *pid)
619 if (NULL == neighbours)
621 return GNUNET_CONTAINER_multihashmap_get (neighbours, &pid->hashPubKey);
625 print_state (int state)
630 case S_NOT_CONNECTED:
631 return "S_NOT_CONNECTED";
636 case S_INIT_BLACKLIST:
637 return "S_INIT_BLACKLIST";
640 return "S_CONNECT_SENT";
642 case S_CONNECT_RECV_ATS:
643 return "S_CONNECT_RECV_ATS";
645 case S_CONNECT_RECV_BLACKLIST:
646 return "S_CONNECT_RECV_BLACKLIST";
648 case S_CONNECT_RECV_ACK:
649 return "S_CONNECT_RECV_ACK";
652 return "S_CONNECTED";
654 case S_RECONNECT_ATS:
655 return "S_RECONNECT_ATS";
657 case S_RECONNECT_BLACKLIST:
658 return "S_RECONNECT_BLACKLIST";
660 case S_RECONNECT_SENT:
661 return "S_RECONNECT_SENT";
663 case S_CONNECTED_SWITCHING_BLACKLIST:
664 return "S_CONNECTED_SWITCHING_BLACKLIST";
666 case S_CONNECTED_SWITCHING_CONNECT_SENT:
667 return "S_CONNECTED_SWITCHING_CONNECT_SENT";
670 return "S_DISCONNECT";
672 case S_DISCONNECT_FINISHED:
673 return "S_DISCONNECT_FINISHED";
685 * Test if we're connected to the given peer.
687 * @param n neighbour entry of peer to test
688 * @return GNUNET_YES if we are connected, GNUNET_NO if not
691 test_connected (struct NeighbourMapEntry *n)
697 case S_NOT_CONNECTED:
699 case S_INIT_BLACKLIST:
701 case S_CONNECT_RECV_ATS:
702 case S_CONNECT_RECV_BLACKLIST:
703 case S_CONNECT_RECV_ACK:
706 case S_RECONNECT_ATS:
707 case S_RECONNECT_BLACKLIST:
708 case S_RECONNECT_SENT:
709 case S_CONNECTED_SWITCHING_BLACKLIST:
710 case S_CONNECTED_SWITCHING_CONNECT_SENT:
713 case S_DISCONNECT_FINISHED:
716 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
720 return GNUNET_SYSERR;
724 * Send information about a new outbound quota to our clients.
726 * @param target affected peer
727 * @param quota new quota
730 send_outbound_quota (const struct GNUNET_PeerIdentity *target,
731 struct GNUNET_BANDWIDTH_Value32NBO quota)
733 struct QuotaSetMessage q_msg;
735 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
736 "Sending outbound quota of %u Bps for peer `%s' to all clients\n",
737 ntohl (quota.value__), GNUNET_i2s (target));
738 q_msg.header.size = htons (sizeof (struct QuotaSetMessage));
739 q_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA);
741 q_msg.peer = (*target);
742 GST_clients_broadcast (&q_msg.header, GNUNET_NO);
747 * We don't need a given neighbour address any more.
748 * Release its resources and give appropriate notifications
749 * to ATS and other subsystems.
751 * @param na address we are done with; 'na' itself must NOT be 'free'd, only the contents!
754 free_address (struct NeighbourAddress *na)
756 if (GNUNET_YES == na->ats_active)
758 GST_validation_set_address_use (na->address, na->session, GNUNET_NO, __LINE__);
759 GNUNET_ATS_address_in_use (GST_ats, na->address, na->session, GNUNET_NO);
761 na->ats_active = GNUNET_NO;
762 if (NULL != na->address)
764 GNUNET_HELLO_address_free (na->address);
772 * Initialize the 'struct NeighbourAddress'.
774 * @param na neighbour address to initialize
775 * @param address address of the other peer, NULL if other peer
777 * @param session session to use (or NULL, in which case an
778 * address must be setup)
779 * @param bandwidth_in inbound quota to be used when connection is up
780 * @param bandwidth_out outbound quota to be used when connection is up
781 * @param is_active GNUNET_YES to mark this as the active address with ATS
784 set_address (struct NeighbourAddress *na,
785 const struct GNUNET_HELLO_Address *address,
786 struct Session *session,
787 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
788 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
791 struct GNUNET_TRANSPORT_PluginFunctions *papi;
793 if (NULL == (papi = GST_plugins_find (address->transport_name)))
798 if (session == na->session)
800 na->bandwidth_in = bandwidth_in;
801 na->bandwidth_out = bandwidth_out;
802 if (is_active != na->ats_active)
804 na->ats_active = is_active;
805 GNUNET_ATS_address_in_use (GST_ats, na->address, na->session, is_active);
806 GST_validation_set_address_use (na->address, na->session, is_active, __LINE__);
808 if (GNUNET_YES == is_active)
810 /* FIXME: is this the right place to set quotas? */
811 GST_neighbours_set_incoming_quota (&address->peer, bandwidth_in);
812 send_outbound_quota (&address->peer, bandwidth_out);
818 session = papi->get_session (papi->cls, address);
821 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
822 "Failed to obtain new session for peer `%s' and address '%s'\n",
823 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
824 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
827 na->address = GNUNET_HELLO_address_copy (address);
828 na->bandwidth_in = bandwidth_in;
829 na->bandwidth_out = bandwidth_out;
830 na->session = session;
831 na->ats_active = is_active;
832 if (GNUNET_YES == is_active)
834 /* Telling ATS about new session */
835 GNUNET_ATS_address_add (GST_ats, na->address, na->session, NULL, 0);
836 GNUNET_ATS_address_in_use (GST_ats, na->address, na->session, GNUNET_YES);
837 GST_validation_set_address_use (na->address, na->session, GNUNET_YES, __LINE__);
839 /* FIXME: is this the right place to set quotas? */
840 GST_neighbours_set_incoming_quota (&address->peer, bandwidth_in);
841 send_outbound_quota (&address->peer, bandwidth_out);
847 * Free a neighbour map entry.
849 * @param n entry to free
850 * @param keep_sessions GNUNET_NO to tell plugin to terminate sessions,
851 * GNUNET_YES to keep all sessions
854 free_neighbour (struct NeighbourMapEntry *n, int keep_sessions)
856 struct MessageQueue *mq;
857 struct GNUNET_TRANSPORT_PluginFunctions *papi;
859 n->is_active = NULL; /* always free'd by its own continuation! */
861 /* fail messages currently in the queue */
862 while (NULL != (mq = n->messages_head))
864 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
865 if (NULL != mq->cont)
866 mq->cont (mq->cont_cls, GNUNET_SYSERR);
869 /* It is too late to send other peer disconnect notifications, but at
870 least internally we need to get clean... */
871 if (GNUNET_YES == test_connected (n))
873 GNUNET_STATISTICS_set (GST_stats,
874 gettext_noop ("# peers connected"),
875 --neighbours_connected,
877 disconnect_notify_cb (callback_cls, &n->id);
880 /* FIXME-PLUGIN-API: This does not seem to guarantee that all
881 transport sessions eventually get killed due to inactivity; they
882 MUST have their own timeout logic (but at least TCP doesn't have
883 one yet). Are we sure that EVERY 'session' of a plugin is
884 actually cleaned up this way!? Note that if we are switching
885 between two TCP sessions to the same peer, the existing plugin
886 API gives us not even the means to selectively kill only one of
887 them! Killing all sessions like this seems to be very, very
889 if ((GNUNET_NO == keep_sessions) &&
890 (NULL != n->primary_address.address) &&
891 (NULL != (papi = GST_plugins_find (n->primary_address.address->transport_name))))
892 papi->disconnect (papi->cls, &n->id);
894 n->state = S_DISCONNECT_FINISHED;
896 GNUNET_assert (GNUNET_YES ==
897 GNUNET_CONTAINER_multihashmap_remove (neighbours,
898 &n->id.hashPubKey, n));
900 /* cut transport-level connection */
901 free_address (&n->primary_address);
902 free_address (&n->alternative_address);
904 // FIXME-ATS-API: we might want to be more specific about
905 // which states we do this from in the future (ATS should
906 // have given us a 'suggest_address' handle, and if we have
907 // such a handle, we should cancel the operation here!
908 GNUNET_ATS_suggest_address_cancel (GST_ats, &n->id);
910 if (GNUNET_SCHEDULER_NO_TASK != n->task)
912 GNUNET_SCHEDULER_cancel (n->task);
913 n->task = GNUNET_SCHEDULER_NO_TASK;
915 /* free rest of memory */
921 * Transmit a message using the current session of the given
924 * @param n entry for the recipient
925 * @param msgbuf buffer to transmit
926 * @param msgbuf_size number of bytes in buffer
927 * @param priority transmission priority
928 * @param timeout transmission timeout
929 * @param cont continuation to call when finished (can be NULL)
930 * @param cont_cls closure for cont
933 send_with_session (struct NeighbourMapEntry *n,
934 const char *msgbuf, size_t msgbuf_size,
936 struct GNUNET_TIME_Relative timeout,
937 GNUNET_TRANSPORT_TransmitContinuation cont,
940 struct GNUNET_TRANSPORT_PluginFunctions *papi;
942 GNUNET_assert (n->primary_address.session != NULL);
943 if ( ( (NULL == (papi = GST_plugins_find (n->primary_address.address->transport_name))) ||
944 (-1 == papi->send (papi->cls,
945 n->primary_address.session,
951 cont (cont_cls, &n->id, GNUNET_SYSERR);
952 GNUNET_break (NULL != papi);
957 * Master task run for every neighbour. Performs all of the time-related
958 * activities (keep alive, send next message, disconnect if idle, finish
959 * clean up after disconnect).
961 * @param cls the 'struct NeighbourMapEntry' for which we are running
962 * @param tc scheduler context (unused)
965 master_task (void *cls,
966 const struct GNUNET_SCHEDULER_TaskContext *tc);
970 * Function called when the 'DISCONNECT' message has been sent by the
971 * plugin. Frees the neighbour --- if the entry still exists.
974 * @param target identity of the neighbour that was disconnected
975 * @param result GNUNET_OK if the disconnect got out successfully
978 send_disconnect_cont (void *cls, const struct GNUNET_PeerIdentity *target,
981 struct NeighbourMapEntry *n;
983 n = lookup_neighbour (target);
985 return; /* already gone */
986 if (S_DISCONNECT != n->state)
987 return; /* have created a fresh entry since */
988 n->state = S_DISCONNECT;
989 if (GNUNET_SCHEDULER_NO_TASK != n->task)
990 GNUNET_SCHEDULER_cancel (n->task);
991 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
996 * Transmit a DISCONNECT message to the other peer.
998 * @param n neighbour to send DISCONNECT message.
1001 send_disconnect (struct NeighbourMapEntry *n)
1003 struct SessionDisconnectMessage disconnect_msg;
1005 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1006 "Sending DISCONNECT message to peer `%4s'\n",
1007 GNUNET_i2s (&n->id));
1008 disconnect_msg.header.size = htons (sizeof (struct SessionDisconnectMessage));
1009 disconnect_msg.header.type =
1010 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1011 disconnect_msg.reserved = htonl (0);
1012 disconnect_msg.purpose.size =
1013 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
1014 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
1015 sizeof (struct GNUNET_TIME_AbsoluteNBO));
1016 disconnect_msg.purpose.purpose =
1017 htonl (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1018 disconnect_msg.timestamp =
1019 GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1020 disconnect_msg.public_key = GST_my_public_key;
1021 GNUNET_assert (GNUNET_OK ==
1022 GNUNET_CRYPTO_rsa_sign (GST_my_private_key,
1023 &disconnect_msg.purpose,
1024 &disconnect_msg.signature));
1026 send_with_session (n,
1027 (const char *) &disconnect_msg, sizeof (disconnect_msg),
1028 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
1029 &send_disconnect_cont, NULL);
1030 GNUNET_STATISTICS_update (GST_stats,
1032 ("# DISCONNECT messages sent"), 1,
1038 * Disconnect from the given neighbour, clean up the record.
1040 * @param n neighbour to disconnect from
1043 disconnect_neighbour (struct NeighbourMapEntry *n)
1045 /* depending on state, notify neighbour and/or upper layers of this peer
1049 case S_NOT_CONNECTED:
1051 case S_INIT_BLACKLIST:
1052 /* other peer is completely unaware of us, no need to send DISCONNECT */
1053 n->state = S_DISCONNECT_FINISHED;
1054 free_neighbour (n, GNUNET_NO);
1056 case S_CONNECT_SENT:
1057 send_disconnect (n);
1058 n->state = S_DISCONNECT;
1060 case S_CONNECT_RECV_ATS:
1061 case S_CONNECT_RECV_BLACKLIST:
1062 /* we never ACK'ed the other peer's request, no need to send DISCONNECT */
1063 n->state = S_DISCONNECT_FINISHED;
1064 free_neighbour (n, GNUNET_NO);
1066 case S_CONNECT_RECV_ACK:
1067 /* we DID ACK the other peer's request, must send DISCONNECT */
1068 send_disconnect (n);
1069 n->state = S_DISCONNECT;
1072 case S_RECONNECT_BLACKLIST:
1073 case S_RECONNECT_SENT:
1074 case S_CONNECTED_SWITCHING_BLACKLIST:
1075 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1076 /* we are currently connected, need to send disconnect and do
1077 internal notifications and update statistics */
1078 send_disconnect (n);
1079 GNUNET_STATISTICS_set (GST_stats,
1080 gettext_noop ("# peers connected"),
1081 --neighbours_connected,
1083 disconnect_notify_cb (callback_cls, &n->id);
1084 n->state = S_DISCONNECT;
1086 case S_RECONNECT_ATS:
1087 /* ATS address request timeout, disconnect without sending disconnect message */
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;
1096 /* already disconnected, ignore */
1098 case S_DISCONNECT_FINISHED:
1099 /* already cleaned up, how did we get here!? */
1103 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1107 /* schedule timeout to clean up */
1108 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1109 GNUNET_SCHEDULER_cancel (n->task);
1110 n->task = GNUNET_SCHEDULER_add_delayed (DISCONNECT_SENT_TIMEOUT,
1116 * We're done with our transmission attempt, continue processing.
1118 * @param cls the 'struct MessageQueue' of the message
1119 * @param receiver intended receiver
1120 * @param success whether it worked or not
1123 transmit_send_continuation (void *cls,
1124 const struct GNUNET_PeerIdentity *receiver,
1127 struct MessageQueue *mq = cls;
1128 struct NeighbourMapEntry *n;
1130 if (NULL == (n = lookup_neighbour (receiver)))
1133 return; /* disconnect or other error while transmitting, can happen */
1135 if (n->is_active == mq)
1137 /* this is still "our" neighbour, remove us from its queue
1138 and allow it to send the next message now */
1139 n->is_active = NULL;
1140 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1141 GNUNET_SCHEDULER_cancel (n->task);
1142 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1144 GNUNET_assert (bytes_in_send_queue >= mq->message_buf_size);
1145 bytes_in_send_queue -= mq->message_buf_size;
1146 GNUNET_STATISTICS_set (GST_stats,
1148 ("# bytes in message queue for other peers"),
1149 bytes_in_send_queue, GNUNET_NO);
1150 if (GNUNET_OK == success)
1151 GNUNET_STATISTICS_update (GST_stats,
1153 ("# messages transmitted to other peers"),
1156 GNUNET_STATISTICS_update (GST_stats,
1158 ("# transmission failures for messages to other peers"),
1160 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1161 "Sending message to `%s' of type %u was a %s\n",
1162 GNUNET_i2s (receiver),
1163 ntohs (((struct GNUNET_MessageHeader *) mq->message_buf)->type),
1164 (success == GNUNET_OK) ? "success" : "FAILURE");
1165 if (NULL != mq->cont)
1166 mq->cont (mq->cont_cls, success);
1172 * Check the message list for the given neighbour and if we can
1173 * send a message, do so. This function should only be called
1174 * if the connection is at least generally ready for transmission.
1175 * While we will only send one message at a time, no bandwidth
1176 * quota management is performed here. If a message was given to
1177 * the plugin, the continuation will automatically re-schedule
1178 * the 'master' task once the next message might be transmitted.
1180 * @param n target peer for which to transmit
1183 try_transmission_to_peer (struct NeighbourMapEntry *n)
1185 struct MessageQueue *mq;
1186 struct GNUNET_TIME_Relative timeout;
1188 if (NULL == n->primary_address.address)
1190 /* no address, why are we here? */
1194 if ((0 == n->primary_address.address->address_length) &&
1195 (NULL == n->primary_address.session))
1197 /* no address, why are we here? */
1201 if (NULL != n->is_active)
1203 /* transmission already pending */
1207 /* timeout messages from the queue that are past their due date */
1208 while (NULL != (mq = n->messages_head))
1210 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1211 if (timeout.rel_value > 0)
1213 GNUNET_STATISTICS_update (GST_stats,
1215 ("# messages timed out while in transport queue"),
1217 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
1219 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR); /* timeout */
1222 return; /* no more messages */
1223 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
1225 send_with_session (n,
1226 mq->message_buf, mq->message_buf_size,
1227 0 /* priority */, timeout,
1228 &transmit_send_continuation, mq);
1233 * Send keepalive message to the neighbour. Must only be called
1234 * if we are on 'connected' state. Will internally determine
1235 * if a keepalive is truly needed (so can always be called).
1237 * @param n neighbour that went idle and needs a keepalive
1240 send_keepalive (struct NeighbourMapEntry *n)
1242 struct GNUNET_MessageHeader m;
1244 GNUNET_assert (S_CONNECTED == n->state);
1245 if (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time).rel_value > 0)
1246 return; /* no keepalive needed at this time */
1247 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1248 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE);
1249 send_with_session (n,
1250 (const void *) &m, sizeof (m),
1251 UINT32_MAX /* priority */,
1252 KEEPALIVE_FREQUENCY,
1254 GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# keepalives sent"), 1,
1256 n->expect_latency_response = GNUNET_YES;
1257 n->last_keep_alive_time = GNUNET_TIME_absolute_get ();
1258 n->keep_alive_time = GNUNET_TIME_relative_to_absolute (KEEPALIVE_FREQUENCY);
1263 * Keep the connection to the given neighbour alive longer,
1264 * we received a KEEPALIVE (or equivalent); send a response.
1266 * @param neighbour neighbour to keep alive (by sending keep alive response)
1269 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
1271 struct NeighbourMapEntry *n;
1272 struct GNUNET_MessageHeader m;
1274 if (NULL == (n = lookup_neighbour (neighbour)))
1276 GNUNET_STATISTICS_update (GST_stats,
1278 ("# KEEPALIVE messages discarded (peer unknown)"),
1282 if (NULL == n->primary_address.session)
1284 GNUNET_STATISTICS_update (GST_stats,
1286 ("# KEEPALIVE messages discarded (no session)"),
1290 /* send reply to allow neighbour to measure latency */
1291 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1292 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE_RESPONSE);
1293 send_with_session(n,
1294 (const void *) &m, sizeof (m),
1295 UINT32_MAX /* priority */,
1296 KEEPALIVE_FREQUENCY,
1302 * We received a KEEP_ALIVE_RESPONSE message and use this to calculate
1303 * latency to this peer. Pass the updated information (existing ats
1304 * plus calculated latency) to ATS.
1306 * @param neighbour neighbour to keep alive
1307 * @param ats performance data
1308 * @param ats_count number of entries in ats
1311 GST_neighbours_keepalive_response (const struct GNUNET_PeerIdentity *neighbour,
1312 const struct GNUNET_ATS_Information *ats,
1315 struct NeighbourMapEntry *n;
1317 struct GNUNET_ATS_Information ats_new[ats_count + 1];
1319 if (NULL == (n = lookup_neighbour (neighbour)))
1321 GNUNET_STATISTICS_update (GST_stats,
1323 ("# KEEPALIVE_RESPONSE messages discarded (not connected)"),
1327 if ( (S_CONNECTED != n->state) ||
1328 (GNUNET_YES != n->expect_latency_response) )
1330 GNUNET_STATISTICS_update (GST_stats,
1332 ("# KEEPALIVE_RESPONSE messages discarded (not expected)"),
1336 n->expect_latency_response = GNUNET_NO;
1337 n->latency = GNUNET_TIME_absolute_get_duration (n->last_keep_alive_time);
1338 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1339 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1340 "Latency for peer `%s' is %llu ms\n",
1341 GNUNET_i2s (&n->id), n->latency.rel_value);
1342 memcpy (ats_new, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1343 /* append latency */
1344 ats_new[ats_count].type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
1345 if (n->latency.rel_value > UINT32_MAX)
1346 latency = UINT32_MAX;
1348 latency = n->latency.rel_value;
1349 ats_new[ats_count].value = htonl (latency);
1350 GNUNET_ATS_address_update (GST_ats,
1351 n->primary_address.address,
1352 n->primary_address.session, ats_new,
1358 * We have received a message from the given sender. How long should
1359 * we delay before receiving more? (Also used to keep the peer marked
1362 * @param sender sender of the message
1363 * @param size size of the message
1364 * @param do_forward set to GNUNET_YES if the message should be forwarded to clients
1365 * GNUNET_NO if the neighbour is not connected or violates the quota,
1366 * GNUNET_SYSERR if the connection is not fully up yet
1367 * @return how long to wait before reading more from this sender
1369 struct GNUNET_TIME_Relative
1370 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
1371 *sender, ssize_t size, int *do_forward)
1373 struct NeighbourMapEntry *n;
1374 struct GNUNET_TIME_Relative ret;
1376 if (NULL == neighbours)
1378 *do_forward = GNUNET_NO;
1379 return GNUNET_TIME_UNIT_FOREVER_REL; /* This can happen during shutdown */
1381 if (NULL == (n = lookup_neighbour (sender)))
1383 GST_neighbours_try_connect (sender);
1384 if (NULL == (n = lookup_neighbour (sender)))
1386 GNUNET_STATISTICS_update (GST_stats,
1388 ("# messages discarded due to lack of neighbour record"),
1390 *do_forward = GNUNET_NO;
1391 return GNUNET_TIME_UNIT_ZERO;
1394 if (! test_connected (n))
1396 *do_forward = GNUNET_SYSERR;
1397 return GNUNET_TIME_UNIT_ZERO;
1399 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
1401 n->quota_violation_count++;
1402 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1403 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
1404 n->in_tracker.available_bytes_per_s__,
1405 n->quota_violation_count);
1406 /* Discount 32k per violation */
1407 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
1411 if (n->quota_violation_count > 0)
1413 /* try to add 32k back */
1414 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
1415 n->quota_violation_count--;
1418 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
1420 GNUNET_STATISTICS_update (GST_stats,
1422 ("# bandwidth quota violations by other peers"),
1424 *do_forward = GNUNET_NO;
1425 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
1427 *do_forward = GNUNET_YES;
1428 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 32 * 1024);
1429 if (ret.rel_value > 0)
1431 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1432 "Throttling read (%llu bytes excess at %u b/s), waiting %llu ms before reading more.\n",
1433 (unsigned long long) n->in_tracker.
1434 consumption_since_last_update__,
1435 (unsigned int) n->in_tracker.available_bytes_per_s__,
1436 (unsigned long long) ret.rel_value);
1437 GNUNET_STATISTICS_update (GST_stats,
1438 gettext_noop ("# ms throttling suggested"),
1439 (int64_t) ret.rel_value, GNUNET_NO);
1446 * Transmit a message to the given target using the active connection.
1448 * @param target destination
1449 * @param msg message to send
1450 * @param msg_size number of bytes in msg
1451 * @param timeout when to fail with timeout
1452 * @param cont function to call when done
1453 * @param cont_cls closure for 'cont'
1456 GST_neighbours_send (const struct GNUNET_PeerIdentity *target, const void *msg,
1457 size_t msg_size, struct GNUNET_TIME_Relative timeout,
1458 GST_NeighbourSendContinuation cont, void *cont_cls)
1460 struct NeighbourMapEntry *n;
1461 struct MessageQueue *mq;
1463 /* All ove these cases should never happen; they are all API violations.
1464 But we check anyway, just to be sure. */
1465 if (NULL == (n = lookup_neighbour (target)))
1469 cont (cont_cls, GNUNET_SYSERR);
1472 if (GNUNET_YES != test_connected (n))
1476 cont (cont_cls, GNUNET_SYSERR);
1479 bytes_in_send_queue += msg_size;
1480 GNUNET_STATISTICS_set (GST_stats,
1482 ("# bytes in message queue for other peers"),
1483 bytes_in_send_queue, GNUNET_NO);
1484 mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
1486 mq->cont_cls = cont_cls;
1487 memcpy (&mq[1], msg, msg_size);
1488 mq->message_buf = (const char *) &mq[1];
1489 mq->message_buf_size = msg_size;
1490 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1491 GNUNET_CONTAINER_DLL_insert_tail (n->messages_head, n->messages_tail, mq);
1492 if ( (NULL != n->is_active) ||
1493 ( (NULL == n->primary_address.session) && (NULL == n->primary_address.address)) )
1495 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1496 GNUNET_SCHEDULER_cancel (n->task);
1497 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1502 * Send a SESSION_CONNECT message via the given address.
1504 * @param na address to use
1507 send_session_connect (struct NeighbourAddress *na)
1509 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1510 struct SessionConnectMessage connect_msg;
1512 if (NULL == (papi = GST_plugins_find (na->address->transport_name)))
1517 if (NULL == na->session)
1518 na->session = papi->get_session (papi->cls, na->address);
1519 if (NULL == na->session)
1524 na->connect_timestamp = GNUNET_TIME_absolute_get ();
1525 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1526 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
1527 connect_msg.reserved = htonl (0);
1528 connect_msg.timestamp = GNUNET_TIME_absolute_hton (na->connect_timestamp);
1529 (void) papi->send (papi->cls,
1531 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1533 GNUNET_TIME_UNIT_FOREVER_REL,
1539 * Send a SESSION_CONNECT_ACK message via the given address.
1541 * @param address address to use
1542 * @param session session to use
1543 * @param timestamp timestamp to use for the ACK message
1546 send_session_connect_ack_message (const struct GNUNET_HELLO_Address *address,
1547 struct Session *session,
1548 struct GNUNET_TIME_Absolute timestamp)
1550 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1551 struct SessionConnectMessage connect_msg;
1553 if (NULL == (papi = GST_plugins_find (address->transport_name)))
1558 if (NULL == session)
1559 session = papi->get_session (papi->cls, address);
1560 if (NULL == session)
1565 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1566 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT_ACK);
1567 connect_msg.reserved = htonl (0);
1568 connect_msg.timestamp = GNUNET_TIME_absolute_hton (timestamp);
1569 (void) papi->send (papi->cls,
1571 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1573 GNUNET_TIME_UNIT_FOREVER_REL,
1579 * Create a fresh entry in the neighbour map for the given peer
1581 * @param peer peer to create an entry for
1582 * @return new neighbour map entry
1584 static struct NeighbourMapEntry *
1585 setup_neighbour (const struct GNUNET_PeerIdentity *peer)
1587 struct NeighbourMapEntry *n;
1589 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1590 "Creating new neighbour entry for `%s'\n",
1592 n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
1594 n->state = S_NOT_CONNECTED;
1595 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
1596 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
1597 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
1598 MAX_BANDWIDTH_CARRY_S);
1599 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1600 GNUNET_assert (GNUNET_OK ==
1601 GNUNET_CONTAINER_multihashmap_put (neighbours,
1602 &n->id.hashPubKey, n,
1603 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1609 * Check if the two given addresses are the same.
1610 * Actually only checks if the sessions are non-NULL
1611 * (which they should be) and then if they are identical;
1612 * the actual addresses don't matter if the session
1613 * pointers match anyway, and we must have session pointers
1616 * @param a1 first address to compare
1617 * @param a2 other address to compare
1618 * @return GNUNET_NO if the addresses do not match, GNUNET_YES if they do match
1621 address_matches (const struct NeighbourAddress *a1,
1622 const struct NeighbourAddress *a2)
1624 if ( (NULL == a1->session) ||
1625 (NULL == a2->session) )
1630 return (a1->session == a2->session) ? GNUNET_YES : GNUNET_NO;
1635 * Try to create a connection to the given target (eventually).
1637 * @param target peer to try to connect to
1640 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
1642 struct NeighbourMapEntry *n;
1644 if (NULL == neighbours)
1645 return; /* during shutdown, do nothing */
1646 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1647 "Asked to connect to peer `%s'\n",
1648 GNUNET_i2s (target));
1650 memcmp (target, &GST_my_identity, sizeof (struct GNUNET_PeerIdentity)))
1652 /* refuse to connect to myself */
1653 /* FIXME: can this happen? Is this not an API violation? */
1654 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1655 "Refusing to try to connect to myself.\n");
1658 n = lookup_neighbour (target);
1663 case S_NOT_CONNECTED:
1664 /* this should not be possible */
1666 free_neighbour (n, GNUNET_NO);
1669 case S_INIT_BLACKLIST:
1670 case S_CONNECT_SENT:
1671 case S_CONNECT_RECV_ATS:
1672 case S_CONNECT_RECV_BLACKLIST:
1673 case S_CONNECT_RECV_ACK:
1674 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1675 "Ignoring request to try to connect to `%s', already trying!\n",
1676 GNUNET_i2s (target));
1677 return; /* already trying */
1679 case S_RECONNECT_ATS:
1680 case S_RECONNECT_BLACKLIST:
1681 case S_RECONNECT_SENT:
1682 case S_CONNECTED_SWITCHING_BLACKLIST:
1683 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1684 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1685 "Ignoring request to try to connect, already connected to `%s'!\n",
1686 GNUNET_i2s (target));
1687 return; /* already connected */
1689 /* get rid of remains, ready to re-try immediately */
1690 free_neighbour (n, GNUNET_NO);
1692 case S_DISCONNECT_FINISHED:
1693 /* should not be possible */
1696 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1698 free_neighbour (n, GNUNET_NO);
1702 n = setup_neighbour (target);
1703 n->state = S_INIT_ATS;
1704 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1706 GNUNET_ATS_reset_backoff (GST_ats, target);
1707 GNUNET_ATS_suggest_address (GST_ats, target);
1712 * Function called with the result of a blacklist check.
1714 * @param cls closure with the 'struct BlackListCheckContext'
1715 * @param peer peer this check affects
1716 * @param result GNUNET_OK if the address is allowed
1719 handle_test_blacklist_cont (void *cls,
1720 const struct GNUNET_PeerIdentity *peer,
1723 struct BlackListCheckContext *bcc = cls;
1724 struct NeighbourMapEntry *n;
1727 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1728 "Connection to new address of peer `%s' based on blacklist is `%s'\n",
1730 (GNUNET_OK == result) ? "allowed" : "FORBIDDEN");
1731 if (GNUNET_OK == result)
1733 /* valid new address, let ATS know! */
1734 GNUNET_ATS_address_add (GST_ats,
1737 bcc->ats, bcc->ats_count);
1739 if (NULL == (n = lookup_neighbour (peer)))
1740 goto cleanup; /* nobody left to care about new address */
1743 case S_NOT_CONNECTED:
1744 /* this should not be possible */
1746 free_neighbour (n, GNUNET_NO);
1749 /* still waiting on ATS suggestion */
1751 case S_INIT_BLACKLIST:
1752 /* check if the address the blacklist was fine with matches
1753 ATS suggestion, if so, we can move on! */
1754 if ( (GNUNET_OK == result) &&
1755 (1 == n->send_connect_ack) )
1757 n->send_connect_ack = 2;
1758 send_session_connect_ack_message (bcc->na.address,
1760 n->connect_ack_timestamp);
1762 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1763 break; /* result for an address we currently don't care about */
1764 if (GNUNET_OK == result)
1766 n->timeout = GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT);
1767 n->state = S_CONNECT_SENT;
1768 send_session_connect (&n->primary_address);
1772 // FIXME: should also possibly destroy session with plugin!?
1773 GNUNET_ATS_address_destroyed (GST_ats,
1776 free_address (&n->primary_address);
1777 n->state = S_INIT_ATS;
1778 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1779 // FIXME: do we need to ask ATS again for suggestions?
1780 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1783 case S_CONNECT_SENT:
1784 /* waiting on CONNECT_ACK, send ACK if one is pending */
1785 if ( (GNUNET_OK == result) &&
1786 (1 == n->send_connect_ack) )
1788 n->send_connect_ack = 2;
1789 send_session_connect_ack_message (n->primary_address.address,
1790 n->primary_address.session,
1791 n->connect_ack_timestamp);
1794 case S_CONNECT_RECV_ATS:
1795 /* still waiting on ATS suggestion, don't care about blacklist */
1797 case S_CONNECT_RECV_BLACKLIST:
1798 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1799 break; /* result for an address we currently don't care about */
1800 if (GNUNET_OK == result)
1802 n->timeout = GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT);
1803 n->state = S_CONNECT_RECV_ACK;
1804 send_session_connect_ack_message (bcc->na.address,
1806 n->connect_ack_timestamp);
1807 if (1 == n->send_connect_ack)
1808 n->send_connect_ack = 2;
1812 // FIXME: should also possibly destroy session with plugin!?
1813 GNUNET_ATS_address_destroyed (GST_ats,
1816 free_address (&n->primary_address);
1817 n->state = S_INIT_ATS;
1818 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1819 // FIXME: do we need to ask ATS again for suggestions?
1820 GNUNET_ATS_reset_backoff (GST_ats, peer);
1821 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1824 case S_CONNECT_RECV_ACK:
1825 /* waiting on SESSION_ACK, send ACK if one is pending */
1826 if ( (GNUNET_OK == result) &&
1827 (1 == n->send_connect_ack) )
1829 n->send_connect_ack = 2;
1830 send_session_connect_ack_message (n->primary_address.address,
1831 n->primary_address.session,
1832 n->connect_ack_timestamp);
1836 /* already connected, don't care about blacklist */
1838 case S_RECONNECT_ATS:
1839 /* still waiting on ATS suggestion, don't care about blacklist */
1841 case S_RECONNECT_BLACKLIST:
1842 if ( (GNUNET_OK == result) &&
1843 (1 == n->send_connect_ack) )
1845 n->send_connect_ack = 2;
1846 send_session_connect_ack_message (bcc->na.address,
1848 n->connect_ack_timestamp);
1850 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1851 break; /* result for an address we currently don't care about */
1852 if (GNUNET_OK == result)
1854 send_session_connect (&n->primary_address);
1855 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
1856 n->state = S_RECONNECT_SENT;
1860 GNUNET_ATS_address_destroyed (GST_ats,
1863 n->state = S_RECONNECT_ATS;
1864 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1865 // FIXME: do we need to ask ATS again for suggestions?
1866 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1869 case S_RECONNECT_SENT:
1870 /* waiting on CONNECT_ACK, don't care about blacklist */
1871 if ( (GNUNET_OK == result) &&
1872 (1 == n->send_connect_ack) )
1874 n->send_connect_ack = 2;
1875 send_session_connect_ack_message (n->primary_address.address,
1876 n->primary_address.session,
1877 n->connect_ack_timestamp);
1880 case S_CONNECTED_SWITCHING_BLACKLIST:
1881 if (GNUNET_YES != address_matches (&bcc->na, &n->alternative_address))
1882 break; /* result for an address we currently don't care about */
1883 if (GNUNET_OK == result)
1885 send_session_connect (&n->alternative_address);
1886 n->state = S_CONNECTED_SWITCHING_CONNECT_SENT;
1890 GNUNET_ATS_address_destroyed (GST_ats,
1893 free_address (&n->alternative_address);
1894 n->state = S_CONNECTED;
1897 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1898 /* waiting on CONNECT_ACK, don't care about blacklist */
1899 if ( (GNUNET_OK == result) &&
1900 (1 == n->send_connect_ack) )
1902 n->send_connect_ack = 2;
1903 send_session_connect_ack_message (n->primary_address.address,
1904 n->primary_address.session,
1905 n->connect_ack_timestamp);
1909 /* Nothing to do here, ATS will already do what can be done */
1911 case S_DISCONNECT_FINISHED:
1912 /* should not be possible */
1916 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1918 free_neighbour (n, GNUNET_NO);
1922 GNUNET_HELLO_address_free (bcc->na.address);
1923 GNUNET_CONTAINER_DLL_remove (bc_head,
1931 * We want to know if connecting to a particular peer via
1932 * a particular address is allowed. Check it!
1934 * @param peer identity of the peer to switch the address for
1935 * @param ts time at which the check was initiated
1936 * @param address address of the other peer, NULL if other peer
1938 * @param session session to use (or NULL)
1939 * @param ats performance data
1940 * @param ats_count number of entries in ats (excluding 0-termination)
1943 check_blacklist (const struct GNUNET_PeerIdentity *peer,
1944 struct GNUNET_TIME_Absolute ts,
1945 const struct GNUNET_HELLO_Address *address,
1946 struct Session *session,
1947 const struct GNUNET_ATS_Information *ats,
1950 struct BlackListCheckContext *bcc;
1951 struct GST_BlacklistCheck *bc;
1954 GNUNET_malloc (sizeof (struct BlackListCheckContext) +
1955 sizeof (struct GNUNET_ATS_Information) * ats_count);
1956 bcc->ats_count = ats_count;
1957 bcc->na.address = GNUNET_HELLO_address_copy (address);
1958 bcc->na.session = session;
1959 bcc->na.connect_timestamp = ts;
1960 bcc->ats = (struct GNUNET_ATS_Information *) &bcc[1];
1961 memcpy (bcc->ats, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1962 GNUNET_CONTAINER_DLL_insert (bc_head,
1965 if (NULL != (bc = GST_blacklist_test_allowed (peer,
1966 address->transport_name,
1967 &handle_test_blacklist_cont, bcc)))
1969 /* if NULL == bc, 'cont' was already called and 'bcc' already free'd, so
1970 we must only store 'bc' if 'bc' is non-NULL... */
1975 * We received a 'SESSION_CONNECT' message from the other peer.
1976 * Consider switching to it.
1978 * @param message possibly a 'struct SessionConnectMessage' (check format)
1979 * @param peer identity of the peer to switch the address for
1980 * @param address address of the other peer, NULL if other peer
1982 * @param session session to use (or NULL)
1983 * @param ats performance data
1984 * @param ats_count number of entries in ats (excluding 0-termination)
1987 GST_neighbours_handle_connect (const struct GNUNET_MessageHeader *message,
1988 const struct GNUNET_PeerIdentity *peer,
1989 const struct GNUNET_HELLO_Address *address,
1990 struct Session *session,
1991 const struct GNUNET_ATS_Information *ats,
1994 const struct SessionConnectMessage *scm;
1995 struct NeighbourMapEntry *n;
1996 struct GNUNET_TIME_Absolute ts;
1998 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1999 "Received CONNECT message from peer `%s'\n",
2001 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2003 GNUNET_break_op (0);
2006 if (NULL == neighbours)
2007 return; /* we're shutting down */
2008 scm = (const struct SessionConnectMessage *) message;
2009 GNUNET_break_op (0 == ntohl (scm->reserved));
2010 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2011 n = lookup_neighbour (peer);
2013 n = setup_neighbour (peer);
2014 n->send_connect_ack = 1;
2015 n->connect_ack_timestamp = ts;
2018 case S_NOT_CONNECTED:
2019 n->state = S_CONNECT_RECV_ATS;
2020 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2021 GNUNET_ATS_reset_backoff (GST_ats, peer);
2022 GNUNET_ATS_suggest_address (GST_ats, peer);
2023 check_blacklist (peer, ts, address, session, ats, ats_count);
2026 case S_INIT_BLACKLIST:
2027 case S_CONNECT_SENT:
2028 case S_CONNECT_RECV_ATS:
2029 case S_CONNECT_RECV_BLACKLIST:
2030 case S_CONNECT_RECV_ACK:
2031 /* It can never hurt to have an alternative address in the above cases,
2032 see if it is allowed */
2033 check_blacklist (peer, ts, address, session, ats, ats_count);
2036 /* we are already connected and can thus send the ACK immediately;
2037 still, it can never hurt to have an alternative address, so also
2038 tell ATS about it */
2039 GNUNET_assert (NULL != n->primary_address.address);
2040 GNUNET_assert (NULL != n->primary_address.session);
2041 n->send_connect_ack = 0;
2042 send_session_connect_ack_message (n->primary_address.address,
2043 n->primary_address.session, ts);
2044 check_blacklist (peer, ts, address, session, ats, ats_count);
2046 case S_RECONNECT_ATS:
2047 case S_RECONNECT_BLACKLIST:
2048 case S_RECONNECT_SENT:
2049 /* It can never hurt to have an alternative address in the above cases,
2050 see if it is allowed */
2051 check_blacklist (peer, ts, address, session, ats, ats_count);
2053 case S_CONNECTED_SWITCHING_BLACKLIST:
2054 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2055 /* we are already connected and can thus send the ACK immediately;
2056 still, it can never hurt to have an alternative address, so also
2057 tell ATS about it */
2058 GNUNET_assert (NULL != n->primary_address.address);
2059 GNUNET_assert (NULL != n->primary_address.session);
2060 n->send_connect_ack = 0;
2061 send_session_connect_ack_message (n->primary_address.address,
2062 n->primary_address.session, ts);
2063 check_blacklist (peer, ts, address, session, ats, ats_count);
2066 /* get rid of remains without terminating sessions, ready to re-try */
2067 free_neighbour (n, GNUNET_YES);
2068 n = setup_neighbour (peer);
2069 n->state = S_CONNECT_RECV_ATS;
2070 GNUNET_ATS_reset_backoff (GST_ats, peer);
2071 GNUNET_ATS_suggest_address (GST_ats, peer);
2073 case S_DISCONNECT_FINISHED:
2074 /* should not be possible */
2078 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2080 free_neighbour (n, GNUNET_NO);
2087 * For an existing neighbour record, set the active connection to
2088 * use the given address.
2090 * @param peer identity of the peer to switch the address for
2091 * @param address address of the other peer, NULL if other peer
2093 * @param session session to use (or NULL)
2094 * @param ats performance data
2095 * @param ats_count number of entries in ats
2096 * @param bandwidth_in inbound quota to be used when connection is up
2097 * @param bandwidth_out outbound quota to be used when connection is up
2100 GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
2101 const struct GNUNET_HELLO_Address *address,
2102 struct Session *session,
2103 const struct GNUNET_ATS_Information *ats,
2105 struct GNUNET_BANDWIDTH_Value32NBO
2107 struct GNUNET_BANDWIDTH_Value32NBO
2110 struct NeighbourMapEntry *n;
2111 struct GNUNET_TRANSPORT_PluginFunctions *papi;
2113 GNUNET_assert (address->transport_name != NULL);
2114 if (NULL == (n = lookup_neighbour (peer)))
2117 /* Obtain an session for this address from plugin */
2118 if (NULL == (papi = GST_plugins_find (address->transport_name)))
2120 /* we don't have the plugin for this address */
2121 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2124 if ((NULL == session) && (0 == address->address_length))
2127 if (strlen (address->transport_name) > 0)
2128 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2131 if (NULL == session)
2132 session = papi->get_session (papi->cls, address);
2133 if (NULL == session)
2135 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2136 "Failed to obtain new session for peer `%s' and address '%s'\n",
2137 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
2138 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2141 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2142 "ATS tells us to switch to address '%s' for peer `%s'\n",
2143 (address->address_length != 0) ? GST_plugins_a2s (address): "<inbound>",
2147 case S_NOT_CONNECTED:
2149 free_neighbour (n, GNUNET_NO);
2152 set_address (&n->primary_address,
2153 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2154 n->state = S_INIT_BLACKLIST;
2155 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2156 check_blacklist (&n->id,
2157 n->connect_ack_timestamp,
2158 address, session, ats, ats_count);
2160 case S_INIT_BLACKLIST:
2161 /* ATS suggests a different address, switch again */
2162 set_address (&n->primary_address,
2163 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2164 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2165 check_blacklist (&n->id,
2166 n->connect_ack_timestamp,
2167 address, session, ats, ats_count);
2169 case S_CONNECT_SENT:
2170 /* ATS suggests a different address, switch again */
2171 set_address (&n->primary_address,
2172 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2173 n->state = S_INIT_BLACKLIST;
2174 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2175 check_blacklist (&n->id,
2176 n->connect_ack_timestamp,
2177 address, session, ats, ats_count);
2179 case S_CONNECT_RECV_ATS:
2180 set_address (&n->primary_address,
2181 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2182 n->state = S_CONNECT_RECV_BLACKLIST;
2183 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2184 check_blacklist (&n->id,
2185 n->connect_ack_timestamp,
2186 address, session, ats, ats_count);
2188 case S_CONNECT_RECV_BLACKLIST:
2189 case S_CONNECT_RECV_ACK:
2190 /* ATS asks us to switch while we were trying to connect; switch to new
2191 address and check blacklist again */
2192 set_address (&n->primary_address,
2193 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2194 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2195 check_blacklist (&n->id,
2196 n->connect_ack_timestamp,
2197 address, session, ats, ats_count);
2200 GNUNET_assert (NULL != n->primary_address.address);
2201 GNUNET_assert (NULL != n->primary_address.session);
2202 if (n->primary_address.session == session)
2204 /* not an address change, just a quota change */
2205 set_address (&n->primary_address,
2206 address, session, bandwidth_in, bandwidth_out, GNUNET_YES);
2209 /* ATS asks us to switch a life connection; see if we can get
2210 a CONNECT_ACK on it before we actually do this! */
2211 set_address (&n->alternative_address,
2212 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2213 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2214 check_blacklist (&n->id,
2215 GNUNET_TIME_absolute_get (),
2216 address, session, ats, ats_count);
2218 case S_RECONNECT_ATS:
2219 set_address (&n->primary_address,
2220 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2221 n->state = S_RECONNECT_BLACKLIST;
2222 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2223 check_blacklist (&n->id,
2224 n->connect_ack_timestamp,
2225 address, session, ats, ats_count);
2227 case S_RECONNECT_BLACKLIST:
2228 /* ATS asks us to switch while we were trying to reconnect; switch to new
2229 address and check blacklist again */
2230 set_address (&n->primary_address,
2231 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2232 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2233 check_blacklist (&n->id,
2234 n->connect_ack_timestamp,
2235 address, session, ats, ats_count);
2237 case S_RECONNECT_SENT:
2238 /* ATS asks us to switch while we were trying to reconnect; switch to new
2239 address and check blacklist again */
2240 set_address (&n->primary_address,
2241 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2242 n->state = S_RECONNECT_BLACKLIST;
2243 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2244 check_blacklist (&n->id,
2245 n->connect_ack_timestamp,
2246 address, session, ats, ats_count);
2248 case S_CONNECTED_SWITCHING_BLACKLIST:
2249 if (n->primary_address.session == session)
2251 /* ATS switches back to still-active session */
2252 free_address (&n->alternative_address);
2253 n->state = S_CONNECTED;
2256 /* ATS asks us to switch a life connection, update blacklist check */
2257 set_address (&n->alternative_address,
2258 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2259 check_blacklist (&n->id,
2260 GNUNET_TIME_absolute_get (),
2261 address, session, ats, ats_count);
2263 case S_CONNECTED_SWITCHING_CONNECT_SENT:
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 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2275 check_blacklist (&n->id,
2276 GNUNET_TIME_absolute_get (),
2277 address, session, ats, ats_count);
2280 /* not going to switch addresses while disconnecting */
2282 case S_DISCONNECT_FINISHED:
2286 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2294 * Master task run for every neighbour. Performs all of the time-related
2295 * activities (keep alive, send next message, disconnect if idle, finish
2296 * clean up after disconnect).
2298 * @param cls the 'struct NeighbourMapEntry' for which we are running
2299 * @param tc scheduler context (unused)
2302 master_task (void *cls,
2303 const struct GNUNET_SCHEDULER_TaskContext *tc)
2305 struct NeighbourMapEntry *n = cls;
2306 struct GNUNET_TIME_Relative delay;
2308 n->task = GNUNET_SCHEDULER_NO_TASK;
2309 delay = GNUNET_TIME_absolute_get_remaining (n->timeout);
2310 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2311 "master task runs for neighbour `%s' in state %d with timeout in %llu ms\n",
2312 GNUNET_i2s (&n->id),
2314 (unsigned long long) delay.rel_value);
2317 case S_NOT_CONNECTED:
2318 /* invalid state for master task, clean up */
2320 n->state = S_DISCONNECT_FINISHED;
2321 free_neighbour (n, GNUNET_NO);
2324 if (0 == delay.rel_value)
2326 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2327 "Connection to `%s' timed out waiting for ATS to provide address\n",
2328 GNUNET_i2s (&n->id));
2329 n->state = S_DISCONNECT_FINISHED;
2330 free_neighbour (n, GNUNET_NO);
2334 case S_INIT_BLACKLIST:
2335 if (0 == delay.rel_value)
2337 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2338 "Connection to `%s' timed out waiting for BLACKLIST to approve address\n",
2339 GNUNET_i2s (&n->id));
2340 n->state = S_DISCONNECT_FINISHED;
2341 free_neighbour (n, GNUNET_NO);
2345 case S_CONNECT_SENT:
2346 if (0 == delay.rel_value)
2348 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2349 "Connection to `%s' timed out waiting for other peer to send CONNECT_ACK\n",
2350 GNUNET_i2s (&n->id));
2351 disconnect_neighbour (n);
2355 case S_CONNECT_RECV_ATS:
2356 if (0 == delay.rel_value)
2358 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2359 "Connection to `%s' timed out waiting ATS to provide address to use for CONNECT_ACK\n",
2360 GNUNET_i2s (&n->id));
2361 n->state = S_DISCONNECT_FINISHED;
2362 free_neighbour (n, GNUNET_NO);
2366 case S_CONNECT_RECV_BLACKLIST:
2367 if (0 == delay.rel_value)
2369 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2370 "Connection to `%s' timed out waiting BLACKLIST to approve address to use for CONNECT_ACK\n",
2371 GNUNET_i2s (&n->id));
2372 n->state = S_DISCONNECT_FINISHED;
2373 free_neighbour (n, GNUNET_NO);
2377 case S_CONNECT_RECV_ACK:
2378 if (0 == delay.rel_value)
2380 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2381 "Connection to `%s' timed out waiting for other peer to send SESSION_ACK\n",
2382 GNUNET_i2s (&n->id));
2383 disconnect_neighbour (n);
2388 if (0 == delay.rel_value)
2390 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2391 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2392 GNUNET_i2s (&n->id));
2393 disconnect_neighbour (n);
2396 try_transmission_to_peer (n);
2399 case S_RECONNECT_ATS:
2400 if (0 == delay.rel_value)
2402 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2403 "Connection to `%s' timed out, waiting for ATS replacement address\n",
2404 GNUNET_i2s (&n->id));
2405 disconnect_neighbour (n);
2409 case S_RECONNECT_BLACKLIST:
2410 if (0 == delay.rel_value)
2412 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2413 "Connection to `%s' timed out, waiting for BLACKLIST to approve replacement address\n",
2414 GNUNET_i2s (&n->id));
2415 disconnect_neighbour (n);
2419 case S_RECONNECT_SENT:
2420 if (0 == delay.rel_value)
2422 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2423 "Connection to `%s' timed out, waiting for other peer to CONNECT_ACK replacement address\n",
2424 GNUNET_i2s (&n->id));
2425 disconnect_neighbour (n);
2429 case S_CONNECTED_SWITCHING_BLACKLIST:
2430 if (0 == delay.rel_value)
2432 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2433 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2434 GNUNET_i2s (&n->id));
2435 disconnect_neighbour (n);
2438 try_transmission_to_peer (n);
2441 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2442 if (0 == delay.rel_value)
2444 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2445 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs (after trying to CONNECT on alternative address)\n",
2446 GNUNET_i2s (&n->id));
2447 disconnect_neighbour (n);
2450 try_transmission_to_peer (n);
2454 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2455 "Cleaning up connection to `%s' after sending DISCONNECT\n",
2456 GNUNET_i2s (&n->id));
2457 n->state = S_DISCONNECT_FINISHED;
2458 free_neighbour (n, GNUNET_NO);
2460 case S_DISCONNECT_FINISHED:
2461 /* how did we get here!? */
2465 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2469 if ( (S_CONNECTED_SWITCHING_CONNECT_SENT == n->state) ||
2470 (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
2471 (S_CONNECTED == n->state) )
2473 /* if we are *now* in one of these three states, we're sending
2474 keep alive messages, so we need to consider the keepalive
2475 delay, not just the connection timeout */
2476 delay = GNUNET_TIME_relative_min (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time),
2479 if (GNUNET_SCHEDULER_NO_TASK == n->task)
2480 n->task = GNUNET_SCHEDULER_add_delayed (delay,
2487 * Send a SESSION_ACK message to the neighbour to confirm that we
2488 * got his CONNECT_ACK.
2490 * @param n neighbour to send the SESSION_ACK to
2493 send_session_ack_message (struct NeighbourMapEntry *n)
2495 struct GNUNET_MessageHeader msg;
2497 msg.size = htons (sizeof (struct GNUNET_MessageHeader));
2498 msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK);
2499 (void) send_with_session(n,
2500 (const char *) &msg, sizeof (struct GNUNET_MessageHeader),
2501 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
2507 * We received a 'SESSION_CONNECT_ACK' message from the other peer.
2508 * Consider switching to it.
2510 * @param message possibly a 'struct SessionConnectMessage' (check format)
2511 * @param peer identity of the peer to switch the address for
2512 * @param address address of the other peer, NULL if other peer
2514 * @param session session to use (or NULL)
2515 * @param ats performance data
2516 * @param ats_count number of entries in ats
2519 GST_neighbours_handle_connect_ack (const struct GNUNET_MessageHeader *message,
2520 const struct GNUNET_PeerIdentity *peer,
2521 const struct GNUNET_HELLO_Address *address,
2522 struct Session *session,
2523 const struct GNUNET_ATS_Information *ats,
2526 const struct SessionConnectMessage *scm;
2527 struct GNUNET_TIME_Absolute ts;
2528 struct NeighbourMapEntry *n;
2530 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2531 "Received CONNECT_ACK message from peer `%s'\n",
2533 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2535 GNUNET_break_op (0);
2538 scm = (const struct SessionConnectMessage *) message;
2539 GNUNET_break_op (ntohl (scm->reserved) == 0);
2540 if (NULL == (n = lookup_neighbour (peer)))
2542 GNUNET_STATISTICS_update (GST_stats,
2544 ("# unexpected CONNECT_ACK messages (no peer)"),
2548 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2551 case S_NOT_CONNECTED:
2553 free_neighbour (n, GNUNET_NO);
2556 case S_INIT_BLACKLIST:
2557 GNUNET_STATISTICS_update (GST_stats,
2559 ("# unexpected CONNECT_ACK messages (not ready)"),
2562 case S_CONNECT_SENT:
2563 if (ts.abs_value != n->primary_address.connect_timestamp.abs_value)
2564 break; /* ACK does not match our original CONNECT message */
2565 n->state = S_CONNECTED;
2566 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2567 GNUNET_STATISTICS_set (GST_stats,
2568 gettext_noop ("# peers connected"),
2569 ++neighbours_connected,
2571 connect_notify_cb (callback_cls, &n->id, ats, ats_count);
2572 set_address (&n->primary_address,
2573 n->primary_address.address,
2574 n->primary_address.session,
2575 n->primary_address.bandwidth_in,
2576 n->primary_address.bandwidth_out,
2578 send_session_ack_message (n);
2580 case S_CONNECT_RECV_ATS:
2581 case S_CONNECT_RECV_BLACKLIST:
2582 case S_CONNECT_RECV_ACK:
2583 GNUNET_STATISTICS_update (GST_stats,
2585 ("# unexpected CONNECT_ACK messages (not ready)"),
2589 /* duplicate CONNECT_ACK, let's answer by duplciate SESSION_ACK just in case */
2590 send_session_ack_message (n);
2592 case S_RECONNECT_ATS:
2593 case S_RECONNECT_BLACKLIST:
2594 /* we didn't expect any CONNECT_ACK, as we are waiting for ATS
2595 to give us a new address... */
2596 GNUNET_STATISTICS_update (GST_stats,
2598 ("# unexpected CONNECT_ACK messages (waiting on ATS)"),
2601 case S_RECONNECT_SENT:
2602 /* new address worked; go back to connected! */
2603 n->state = S_CONNECTED;
2604 send_session_ack_message (n);
2606 case S_CONNECTED_SWITCHING_BLACKLIST:
2607 /* duplicate CONNECT_ACK, let's answer by duplciate SESSION_ACK just in case */
2608 send_session_ack_message (n);
2610 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2611 /* new address worked; adopt it and go back to connected! */
2612 n->state = S_CONNECTED;
2613 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2614 GNUNET_break (GNUNET_NO == n->alternative_address.ats_active);
2615 set_address (&n->primary_address,
2616 n->alternative_address.address,
2617 n->alternative_address.session,
2618 n->alternative_address.bandwidth_in,
2619 n->alternative_address.bandwidth_out,
2621 free_address (&n->alternative_address);
2622 send_session_ack_message (n);
2625 GNUNET_STATISTICS_update (GST_stats,
2627 ("# unexpected CONNECT_ACK messages (disconnecting)"),
2630 case S_DISCONNECT_FINISHED:
2634 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2642 * A session was terminated. Take note; if needed, try to get
2643 * an alternative address from ATS.
2645 * @param peer identity of the peer where the session died
2646 * @param session session that is gone
2649 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
2650 struct Session *session)
2652 struct NeighbourMapEntry *n;
2653 struct BlackListCheckContext *bcc;
2654 struct BlackListCheckContext *bcc_next;
2656 /* make sure to cancel all ongoing blacklist checks involving 'session' */
2658 while (NULL != (bcc = bcc_next))
2660 bcc_next = bcc->next;
2661 if (bcc->na.session == session)
2663 GST_blacklist_test_cancel (bcc->bc);
2664 GNUNET_HELLO_address_free (bcc->na.address);
2665 GNUNET_CONTAINER_DLL_remove (bc_head,
2671 if (NULL == (n = lookup_neighbour (peer)))
2672 return; /* can't affect us */
2673 if (session != n->primary_address.session)
2675 if (session == n->alternative_address.session)
2677 free_address (&n->alternative_address);
2678 if ( (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
2679 (S_CONNECTED_SWITCHING_CONNECT_SENT == n->state) )
2680 n->state = S_CONNECTED;
2684 return; /* doesn't affect us further */
2687 n->expect_latency_response = GNUNET_NO;
2691 case S_NOT_CONNECTED:
2693 free_neighbour (n, GNUNET_NO);
2697 free_neighbour (n, GNUNET_NO);
2699 case S_INIT_BLACKLIST:
2700 case S_CONNECT_SENT:
2701 free_address (&n->primary_address);
2702 n->state = S_INIT_ATS;
2703 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2704 // FIXME: need to ask ATS for suggestions again?
2705 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2707 case S_CONNECT_RECV_ATS:
2708 case S_CONNECT_RECV_BLACKLIST:
2709 case S_CONNECT_RECV_ACK:
2710 /* error on inbound session; free neighbour entirely */
2711 free_address (&n->primary_address);
2712 free_neighbour (n, GNUNET_NO);
2715 free_address (&n->primary_address);
2716 n->state = S_RECONNECT_ATS;
2717 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2718 /* FIXME: is this ATS call needed? */
2719 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2721 case S_RECONNECT_ATS:
2722 /* we don't have an address, how can it go down? */
2725 case S_RECONNECT_BLACKLIST:
2726 case S_RECONNECT_SENT:
2727 n->state = S_RECONNECT_ATS;
2728 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2729 // FIXME: need to ask ATS for suggestions again?
2730 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2732 case S_CONNECTED_SWITCHING_BLACKLIST:
2733 /* primary went down while we were checking secondary against
2734 blacklist, adopt secondary as primary */
2735 free_address (&n->primary_address);
2736 n->primary_address = n->alternative_address;
2737 memset (&n->alternative_address, 0, sizeof (struct NeighbourAddress));
2738 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
2739 n->state = S_RECONNECT_BLACKLIST;
2741 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2742 /* primary went down while we were waiting for CONNECT_ACK on secondary;
2743 secondary as primary */
2744 free_address (&n->primary_address);
2745 n->primary_address = n->alternative_address;
2746 memset (&n->alternative_address, 0, sizeof (struct NeighbourAddress));
2747 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
2748 n->state = S_RECONNECT_SENT;
2751 free_address (&n->primary_address);
2753 case S_DISCONNECT_FINISHED:
2754 /* neighbour was freed and plugins told to terminate session */
2757 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2761 if (GNUNET_SCHEDULER_NO_TASK != n->task)
2762 GNUNET_SCHEDULER_cancel (n->task);
2763 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
2768 * We received a 'SESSION_ACK' message from the other peer.
2769 * If we sent a 'CONNECT_ACK' last, this means we are now
2770 * connected. Otherwise, do nothing.
2772 * @param message possibly a 'struct SessionConnectMessage' (check format)
2773 * @param peer identity of the peer to switch the address for
2774 * @param address address of the other peer, NULL if other peer
2776 * @param session session to use (or NULL)
2777 * @param ats performance data
2778 * @param ats_count number of entries in ats
2781 GST_neighbours_handle_session_ack (const struct GNUNET_MessageHeader *message,
2782 const struct GNUNET_PeerIdentity *peer,
2783 const struct GNUNET_HELLO_Address *address,
2784 struct Session *session,
2785 const struct GNUNET_ATS_Information *ats,
2788 struct NeighbourMapEntry *n;
2790 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2791 "Received SESSION_ACK message from peer `%s'\n",
2793 if (ntohs (message->size) != sizeof (struct GNUNET_MessageHeader))
2795 GNUNET_break_op (0);
2798 if (NULL == (n = lookup_neighbour (peer)))
2800 /* check if we are in a plausible state for having sent
2801 a CONNECT_ACK. If not, return, otherwise break */
2802 if ( ( (S_CONNECT_RECV_ACK != n->state) &&
2803 (S_CONNECT_SENT != n->state) ) ||
2804 (2 != n->send_connect_ack) )
2806 GNUNET_STATISTICS_update (GST_stats,
2807 gettext_noop ("# unexpected SESSION ACK messages"), 1,
2811 n->state = S_CONNECTED;
2812 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2813 GNUNET_STATISTICS_set (GST_stats,
2814 gettext_noop ("# peers connected"),
2815 ++neighbours_connected,
2817 connect_notify_cb (callback_cls, &n->id, ats, ats_count);
2818 set_address (&n->primary_address,
2819 n->primary_address.address,
2820 n->primary_address.session,
2821 n->primary_address.bandwidth_in,
2822 n->primary_address.bandwidth_out,
2828 * Test if we're connected to the given peer.
2830 * @param target peer to test
2831 * @return GNUNET_YES if we are connected, GNUNET_NO if not
2834 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
2836 return test_connected (lookup_neighbour (target));
2841 * Change the incoming quota for the given peer.
2843 * @param neighbour identity of peer to change qutoa for
2844 * @param quota new quota
2847 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
2848 struct GNUNET_BANDWIDTH_Value32NBO quota)
2850 struct NeighbourMapEntry *n;
2852 if (NULL == (n = lookup_neighbour (neighbour)))
2854 GNUNET_STATISTICS_update (GST_stats,
2856 ("# SET QUOTA messages ignored (no such peer)"),
2860 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2861 "Setting inbound quota of %u Bps for peer `%s' to all clients\n",
2862 ntohl (quota.value__), GNUNET_i2s (&n->id));
2863 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
2864 if (0 != ntohl (quota.value__))
2866 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
2867 GNUNET_i2s (&n->id), "SET_QUOTA");
2868 if (GNUNET_YES == test_connected (n))
2869 GNUNET_STATISTICS_update (GST_stats,
2870 gettext_noop ("# disconnects due to quota of 0"),
2872 disconnect_neighbour (n);
2877 * We received a disconnect message from the given peer,
2878 * validate and process.
2880 * @param peer sender of the message
2881 * @param msg the disconnect message
2884 GST_neighbours_handle_disconnect_message (const struct GNUNET_PeerIdentity
2886 const struct GNUNET_MessageHeader
2889 struct NeighbourMapEntry *n;
2890 const struct SessionDisconnectMessage *sdm;
2891 struct GNUNET_HashCode hc;
2893 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2894 "Received DISCONNECT message from peer `%s'\n",
2896 if (ntohs (msg->size) != sizeof (struct SessionDisconnectMessage))
2898 // GNUNET_break_op (0);
2899 GNUNET_STATISTICS_update (GST_stats,
2901 ("# disconnect messages ignored (old format)"), 1,
2905 sdm = (const struct SessionDisconnectMessage *) msg;
2906 if (NULL == (n = lookup_neighbour (peer)))
2907 return; /* gone already */
2908 if (GNUNET_TIME_absolute_ntoh (sdm->timestamp).abs_value <= n->connect_ack_timestamp.abs_value)
2910 GNUNET_STATISTICS_update (GST_stats,
2912 ("# disconnect messages ignored (timestamp)"), 1,
2916 GNUNET_CRYPTO_hash (&sdm->public_key,
2917 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2919 if (0 != memcmp (peer, &hc, sizeof (struct GNUNET_PeerIdentity)))
2921 GNUNET_break_op (0);
2924 if (ntohl (sdm->purpose.size) !=
2925 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2926 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
2927 sizeof (struct GNUNET_TIME_AbsoluteNBO))
2929 GNUNET_break_op (0);
2933 GNUNET_CRYPTO_rsa_verify
2934 (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT, &sdm->purpose,
2935 &sdm->signature, &sdm->public_key))
2937 GNUNET_break_op (0);
2940 if (GNUNET_YES == test_connected (n))
2941 GNUNET_STATISTICS_update (GST_stats,
2943 ("# other peer asked to disconnect from us"), 1,
2945 disconnect_neighbour (n);
2950 * Closure for the neighbours_iterate function.
2952 struct IteratorContext
2955 * Function to call on each connected neighbour.
2957 GST_NeighbourIterator cb;
2967 * Call the callback from the closure for each connected neighbour.
2969 * @param cls the 'struct IteratorContext'
2970 * @param key the hash of the public key of the neighbour
2971 * @param value the 'struct NeighbourMapEntry'
2972 * @return GNUNET_OK (continue to iterate)
2975 neighbours_iterate (void *cls, const struct GNUNET_HashCode * key, void *value)
2977 struct IteratorContext *ic = cls;
2978 struct NeighbourMapEntry *n = value;
2980 if (GNUNET_YES == test_connected (n))
2981 ic->cb (ic->cb_cls, &n->id, NULL, 0, n->primary_address.address);
2987 * Iterate over all connected neighbours.
2989 * @param cb function to call
2990 * @param cb_cls closure for cb
2993 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
2995 struct IteratorContext ic;
2997 if (NULL == neighbours)
2998 return; /* can happen during shutdown */
3001 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
3006 * If we have an active connection to the given target, it must be shutdown.
3008 * @param target peer to disconnect from
3011 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
3013 struct NeighbourMapEntry *n;
3015 if (NULL == (n = lookup_neighbour (target)))
3016 return; /* not active */
3017 if (GNUNET_YES == test_connected (n))
3018 GNUNET_STATISTICS_update (GST_stats,
3020 ("# disconnected from peer upon explicit request"), 1,
3022 disconnect_neighbour (n);
3027 * Obtain current latency information for the given neighbour.
3029 * @param peer to get the latency for
3030 * @return observed latency of the address, FOREVER if the
3031 * the connection is not up
3033 struct GNUNET_TIME_Relative
3034 GST_neighbour_get_latency (const struct GNUNET_PeerIdentity *peer)
3036 struct NeighbourMapEntry *n;
3038 n = lookup_neighbour (peer);
3040 return GNUNET_TIME_UNIT_FOREVER_REL;
3044 case S_RECONNECT_SENT:
3045 case S_RECONNECT_ATS:
3047 case S_NOT_CONNECTED:
3048 case S_INIT_BLACKLIST:
3050 case S_CONNECT_SENT:
3051 case S_CONNECT_RECV_BLACKLIST:
3053 case S_DISCONNECT_FINISHED:
3054 return GNUNET_TIME_UNIT_FOREVER_REL;
3056 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
3060 return GNUNET_TIME_UNIT_FOREVER_REL;
3065 * Obtain current address information for the given neighbour.
3068 * @return address currently used
3070 struct GNUNET_HELLO_Address *
3071 GST_neighbour_get_current_address (const struct GNUNET_PeerIdentity *peer)
3073 struct NeighbourMapEntry *n;
3075 n = lookup_neighbour (peer);
3078 return n->primary_address.address;
3083 * Initialize the neighbours subsystem.
3085 * @param cls closure for callbacks
3086 * @param connect_cb function to call if we connect to a peer
3087 * @param disconnect_cb function to call if we disconnect from a peer
3088 * @param peer_address_cb function to call if we change an active address
3092 GST_neighbours_start (void *cls,
3093 GNUNET_TRANSPORT_NotifyConnect connect_cb,
3094 GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb,
3095 GNUNET_TRANSPORT_PeerIterateCallback peer_address_cb)
3098 connect_notify_cb = connect_cb;
3099 disconnect_notify_cb = disconnect_cb;
3100 address_change_cb = peer_address_cb;
3101 neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE);
3106 * Disconnect from the given neighbour.
3109 * @param key hash of neighbour's public key (not used)
3110 * @param value the 'struct NeighbourMapEntry' of the neighbour
3111 * @return GNUNET_OK (continue to iterate)
3114 disconnect_all_neighbours (void *cls, const struct GNUNET_HashCode * key, void *value)
3116 struct NeighbourMapEntry *n = value;
3118 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3119 "Disconnecting peer `%4s', %s\n",
3120 GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
3121 n->state = S_DISCONNECT_FINISHED;
3122 free_neighbour (n, GNUNET_NO);
3128 * Cleanup the neighbours subsystem.
3131 GST_neighbours_stop ()
3133 if (NULL == neighbours)
3135 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
3136 &disconnect_all_neighbours,
3138 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
3140 callback_cls = NULL;
3141 connect_notify_cb = NULL;
3142 disconnect_notify_cb = NULL;
3143 address_change_cb = NULL;
3147 /* end of file gnunet-service-transport_neighbours.c */