2 This file is part of GNUnet.
3 (C) 2007, 2008, 2009, 2010 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
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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.
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 * @file topology/gnunet-daemon-topology.c
23 * @brief code for maintaining the mesh topology
24 * @author Christian Grothoff
29 #include "gnunet_constants.h"
30 #include "gnunet_core_service.h"
31 #include "gnunet_protocols.h"
32 #include "gnunet_peerinfo_service.h"
33 #include "gnunet_statistics_service.h"
34 #include "gnunet_transport_service.h"
35 #include "gnunet_util_lib.h"
38 #define DEBUG_TOPOLOGY GNUNET_YES
41 * For how long do we blacklist a peer after a failed connection
44 #define GREYLIST_AFTER_ATTEMPT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
47 * For how long do we blacklist a friend after a failed connection
50 #define GREYLIST_AFTER_ATTEMPT_FRIEND GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
53 * For how long do we blacklist anyone under any cirumstances after a failed connection
56 #define GREYLIST_AFTER_ATTEMPT_MIN GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
59 * For how long do we blacklist anyone under any cirumstances after a failed connection
62 #define GREYLIST_AFTER_ATTEMPT_MAX GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
65 * How often do we at most advertise any HELLO to a peer?
67 #define HELLO_ADVERTISEMENT_MIN_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 4)
70 * How often do we at most advertise the same HELLO to the same peer?
72 #define HELLO_ADVERTISEMENT_MIN_REPEAT_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 4)
76 * Record for neighbours, friends and blacklisted peers.
81 * Which peer is this entry about?
83 struct GNUNET_PeerIdentity pid;
86 * Our handle for the request to transmit HELLOs to this peer; NULL
87 * if no such request is pending.
89 struct GNUNET_CORE_TransmitHandle *hello_req;
92 * Our handle for the request to connect to this peer; NULL if no
93 * such request is pending.
95 struct GNUNET_CORE_PeerRequestHandle *connect_req;
98 * Pointer to the HELLO message of this peer; can be NULL.
100 struct GNUNET_HELLO_Message *hello;
103 * Bloom filter used to mark which peers already got the HELLO
106 struct GNUNET_CONTAINER_BloomFilter *filter;
109 * Until what time should we not try to connect again
112 struct GNUNET_TIME_Absolute greylisted_until;
115 * Next time we are allowed to transmit a HELLO to this peer?
117 struct GNUNET_TIME_Absolute next_hello_allowed;
120 * When should we reset the bloom filter of this entry?
122 struct GNUNET_TIME_Absolute filter_expiration;
125 * ID of task we use to wait for the time to send the next HELLO
128 GNUNET_SCHEDULER_TaskIdentifier hello_delay_task;
131 * ID of task we use to clear peers from the greylist.
133 GNUNET_SCHEDULER_TaskIdentifier greylist_clean_task;
136 * How often have we tried so far?
138 unsigned int connect_attempts;
141 * Is this peer listed here because he is a friend?
146 * Are we connected to this peer right now?
154 * Our peerinfo notification context. We use notification
155 * to instantly learn about new peers as they are discovered.
157 static struct GNUNET_PEERINFO_NotifyContext *peerinfo_notify;
162 static const struct GNUNET_CONFIGURATION_Handle *cfg;
165 * Handle to the core API.
167 static struct GNUNET_CORE_Handle *handle;
170 * Handle to the transport API.
172 static struct GNUNET_TRANSPORT_Handle *transport;
175 * Identity of this peer.
177 static struct GNUNET_PeerIdentity my_identity;
180 * All of our friends, all of our current neighbours and all peers for
181 * which we have HELLOs. So pretty much everyone. Maps peer identities
182 * to 'struct Peer *' values.
184 static struct GNUNET_CONTAINER_MultiHashMap *peers;
187 * Handle for reporting statistics.
189 static struct GNUNET_STATISTICS_Handle *stats;
192 * Blacklist (NULL if we have none).
194 static struct GNUNET_TRANSPORT_Blacklist *blacklist;
197 * Flag to disallow non-friend connections (pure F2F mode).
199 static int friends_only;
202 * Minimum number of friends to have in the
203 * connection set before we allow non-friends.
205 static unsigned int minimum_friend_count;
208 * Number of peers (friends and others) that we are currently connected to.
210 static unsigned int connection_count;
213 * Target number of connections.
215 static unsigned int target_connection_count;
218 * Number of friends that we are currently connected to.
220 static unsigned int friend_count;
223 * Should the topology daemon try to establish connections?
225 static int autoconnect;
229 * Function that decides if a connection is acceptable or not.
230 * If we have a blacklist, only friends are allowed, so the check
234 * @param pid peer to approve or disapproave
235 * @return GNUNET_OK if the connection is allowed
238 blacklist_check (void *cls,
239 const struct GNUNET_PeerIdentity *pid)
243 pos = GNUNET_CONTAINER_multihashmap_get (peers, &pid->hashPubKey);
244 if ( (pos != NULL) &&
245 (pos->is_friend == GNUNET_YES) )
247 GNUNET_STATISTICS_update (stats,
248 gettext_noop ("# peers blacklisted"),
251 return GNUNET_SYSERR;
256 * Whitelist all peers that we blacklisted; we've passed
257 * the minimum number of friends.
262 if (blacklist != NULL)
264 GNUNET_TRANSPORT_blacklist_cancel (blacklist);
271 * Function called by core when our attempt to connect succeeded.
273 * @param cls the 'struct Peer' for which we issued the connect request
274 * @param success was the request transmitted
277 connect_completed_callback (void *cls,
280 struct Peer *pos = cls;
282 pos->connect_req = NULL;
287 * Check if an additional connection from the given peer is allowed.
289 * @param peer connection to check
290 * @return GNUNET_OK if the connection is allowed
293 is_connection_allowed (struct Peer *peer)
295 if (0 == memcmp (&my_identity,
297 sizeof (struct GNUNET_PeerIdentity)))
298 return GNUNET_SYSERR; /* disallow connections to self */
301 if (GNUNET_YES == friends_only)
304 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
305 "Determined that `%s' is not allowed to connect (not a friend)\n",
306 GNUNET_i2s (&peer->pid));
308 return GNUNET_SYSERR;
310 if (friend_count >= minimum_friend_count)
313 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
314 "Determined that `%s' is not allowed to connect (not enough connected friends)\n",
315 GNUNET_i2s (&peer->pid));
317 return GNUNET_SYSERR;
322 * Free all resources associated with the given peer.
324 * @param cls closure (not used)
325 * @param pid identity of the peer
326 * @param value peer to free
327 * @return GNUNET_YES (always: continue to iterate)
330 free_peer (void *cls,
331 const GNUNET_HashCode *pid,
334 struct Peer *pos = value;
336 GNUNET_break (GNUNET_OK ==
337 GNUNET_CONTAINER_multihashmap_remove (peers,
340 if (pos->hello_req != NULL)
341 GNUNET_CORE_notify_transmit_ready_cancel (pos->hello_req);
342 if (pos->connect_req != NULL)
343 GNUNET_CORE_peer_request_connect_cancel (pos->connect_req);
344 if (pos->hello_delay_task != GNUNET_SCHEDULER_NO_TASK)
345 GNUNET_SCHEDULER_cancel (pos->hello_delay_task);
346 if (pos->greylist_clean_task != GNUNET_SCHEDULER_NO_TASK)
347 GNUNET_SCHEDULER_cancel (pos->greylist_clean_task);
348 GNUNET_free_non_null (pos->hello);
349 if (pos->filter != NULL)
350 GNUNET_CONTAINER_bloomfilter_free (pos->filter);
357 * Discard peer entries for greylisted peers
358 * where the greylisting has expired.
360 * @param cls 'struct Peer' to greylist
361 * @param tc scheduler context
364 remove_from_greylist (void *cls,
365 const struct GNUNET_SCHEDULER_TaskContext *tc);
369 * Try to connect to the specified peer.
371 * @param pos peer to connect to
374 attempt_connect (struct Peer *pos)
376 struct GNUNET_TIME_Relative rem;
378 if ( (connection_count >= target_connection_count) &&
379 (friend_count >= minimum_friend_count) )
381 if (GNUNET_YES == pos->is_connected)
383 if (GNUNET_OK != is_connection_allowed (pos))
385 if (GNUNET_TIME_absolute_get_remaining (pos->greylisted_until).rel_value > 0)
387 if (GNUNET_YES == pos->is_friend)
388 rem = GREYLIST_AFTER_ATTEMPT_FRIEND;
390 rem = GREYLIST_AFTER_ATTEMPT;
391 rem = GNUNET_TIME_relative_multiply (rem, connection_count);
392 rem = GNUNET_TIME_relative_divide (rem, target_connection_count);
393 if (pos->connect_attempts > 30)
394 pos->connect_attempts = 30;
395 rem = GNUNET_TIME_relative_multiply (rem, 1 << (++pos->connect_attempts));
396 rem = GNUNET_TIME_relative_max (rem,
397 GREYLIST_AFTER_ATTEMPT_MIN);
398 rem = GNUNET_TIME_relative_min (rem,
399 GREYLIST_AFTER_ATTEMPT_MAX);
400 pos->greylisted_until = GNUNET_TIME_relative_to_absolute (rem);
401 if (pos->greylist_clean_task != GNUNET_SCHEDULER_NO_TASK)
402 GNUNET_SCHEDULER_cancel (pos->greylist_clean_task);
403 pos->greylist_clean_task
404 = GNUNET_SCHEDULER_add_delayed (rem,
405 &remove_from_greylist,
408 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
409 "Asking to connect to `%s'\n",
410 GNUNET_i2s (&pos->pid));
412 GNUNET_STATISTICS_update (stats,
413 gettext_noop ("# connect requests issued to core"),
416 pos->connect_req = GNUNET_CORE_peer_request_connect (handle,
417 GNUNET_TIME_UNIT_MINUTES,
419 &connect_completed_callback,
425 * Discard peer entries for greylisted peers
426 * where the greylisting has expired.
428 * @param cls 'struct Peer' to greylist
429 * @param tc scheduler context
432 remove_from_greylist (void *cls,
433 const struct GNUNET_SCHEDULER_TaskContext *tc)
435 struct Peer *pos = cls;
436 struct GNUNET_TIME_Relative rem;
438 pos->greylist_clean_task = GNUNET_SCHEDULER_NO_TASK;
439 rem = GNUNET_TIME_absolute_get_remaining (pos->greylisted_until);
440 if (rem.rel_value == 0)
442 attempt_connect (pos);
446 pos->greylist_clean_task
447 = GNUNET_SCHEDULER_add_delayed (rem,
448 &remove_from_greylist,
451 if ( (GNUNET_NO == pos->is_friend) &&
452 (GNUNET_NO == pos->is_connected) )
454 free_peer (NULL, &pos->pid.hashPubKey, pos);
461 * Create a new entry in the peer list.
463 * @param peer identity of the new entry
464 * @param hello hello message, can be NULL
465 * @param is_friend is the new entry for a friend?
466 * @return the new entry
469 make_peer (const struct
470 GNUNET_PeerIdentity * peer,
471 const struct GNUNET_HELLO_Message *hello,
476 ret = GNUNET_malloc (sizeof (struct Peer));
478 ret->is_friend = is_friend;
481 ret->hello = GNUNET_malloc (GNUNET_HELLO_size (hello));
482 memcpy (ret->hello, hello,
483 GNUNET_HELLO_size (hello));
485 GNUNET_break (GNUNET_OK ==
486 GNUNET_CONTAINER_multihashmap_put (peers,
489 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
495 * Setup bloom filter for the given peer entry.
497 * @param peer entry to initialize
500 setup_filter (struct Peer *peer)
502 /* 2^{-5} chance of not sending a HELLO to a peer is
503 acceptably small (if the filter is 50% full);
504 64 bytes of memory are small compared to the rest
505 of the data structure and would only really become
506 "useless" once a HELLO has been passed on to ~100
507 other peers, which is likely more than enough in
508 any case; hence 64, 5 as bloomfilter parameters. */
509 peer->filter = GNUNET_CONTAINER_bloomfilter_load (NULL, 64, 5);
510 peer->filter_expiration = GNUNET_TIME_relative_to_absolute (HELLO_ADVERTISEMENT_MIN_REPEAT_FREQUENCY);
511 /* never send a peer its own HELLO */
512 GNUNET_CONTAINER_bloomfilter_add (peer->filter, &peer->pid.hashPubKey);
517 * Function to fill send buffer with HELLO.
519 * @param cls 'struct Peer' of the target peer
520 * @param size number of bytes available in buf
521 * @param buf where the callee should write the message
522 * @return number of bytes written to buf
525 hello_advertising_ready (void *cls,
533 * Closure for 'find_advertisable_hello'.
535 struct FindAdvHelloContext {
538 * Peer we want to advertise to.
543 * Where to store the result (peer selected for advertising).
548 * Maximum HELLO size we can use right now.
552 struct GNUNET_TIME_Relative next_adv;
557 * Find a peer that would be reasonable for advertising.
560 * @param pid identity of a peer
561 * @param value 'struct Peer*' for the peer we are considering
562 * @return GNUNET_YES (continue iteration)
565 find_advertisable_hello (void *cls,
566 const GNUNET_HashCode *pid,
569 struct FindAdvHelloContext *fah = cls;
570 struct Peer *pos = value;
571 struct GNUNET_TIME_Relative rst_time;
574 if (pos == fah->peer)
576 if (pos->hello == NULL)
578 rst_time = GNUNET_TIME_absolute_get_remaining (pos->filter_expiration);
579 if (0 == rst_time.rel_value)
581 /* time to discard... */
582 GNUNET_CONTAINER_bloomfilter_free (pos->filter);
585 fah->next_adv = GNUNET_TIME_relative_min (rst_time,
587 hs = GNUNET_HELLO_size (pos->hello);
588 if (hs > fah->max_size)
591 GNUNET_CONTAINER_bloomfilter_test (pos->filter,
592 &fah->peer->pid.hashPubKey))
599 * Calculate when we would like to send the next HELLO to this
600 * peer and ask for it.
602 * @param cls for which peer to schedule the HELLO
603 * @param tc task context
606 schedule_next_hello (void *cls,
607 const struct GNUNET_SCHEDULER_TaskContext *tc)
609 struct Peer *pl = cls;
610 struct FindAdvHelloContext fah;
612 struct GNUNET_TIME_Relative delay;
614 pl->hello_delay_task = GNUNET_SCHEDULER_NO_TASK;
615 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
616 return; /* we're out of here */
617 if (pl->hello_req != NULL)
618 return; /* did not finish sending the previous one */
619 /* find applicable HELLOs */
622 fah.max_size = GNUNET_SERVER_MAX_MESSAGE_SIZE - 1;
623 fah.next_adv = GNUNET_TIME_UNIT_FOREVER_REL;
624 GNUNET_CONTAINER_multihashmap_iterate (peers,
625 &find_advertisable_hello,
628 = GNUNET_SCHEDULER_add_delayed (fah.next_adv,
629 &schedule_next_hello,
631 if (fah.result == NULL)
633 next_want = GNUNET_HELLO_size (fah.result->hello);
634 delay = GNUNET_TIME_absolute_get_remaining (pl->next_hello_allowed);
635 if (delay.rel_value == 0)
638 pl->hello_req = GNUNET_CORE_notify_transmit_ready (handle, 0,
639 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
642 &hello_advertising_ready,
649 * Cancel existing requests for sending HELLOs to this peer
650 * and recalculate when we should send HELLOs to it based
651 * on our current state (something changed!).
653 * @param cls closure, 'struct Peer' to skip, or NULL
654 * @param pid identity of a peer
655 * @param value 'struct Peer*' for the peer
656 * @return GNUNET_YES (always)
659 reschedule_hellos (void *cls,
660 const GNUNET_HashCode *pid,
663 struct Peer *peer = value;
664 struct Peer *skip = cls;
668 if (! peer->is_connected)
670 if (peer->hello_req != NULL)
672 GNUNET_CORE_notify_transmit_ready_cancel (peer->hello_req);
673 peer->hello_req = NULL;
675 if (peer->hello_delay_task != GNUNET_SCHEDULER_NO_TASK)
677 GNUNET_SCHEDULER_cancel (peer->hello_delay_task);
678 peer->hello_delay_task = GNUNET_SCHEDULER_NO_TASK;
680 peer->hello_delay_task
681 = GNUNET_SCHEDULER_add_now (&schedule_next_hello,
688 * Method called whenever a peer connects.
691 * @param peer peer identity this notification is about
692 * @param atsi performance data
695 connect_notify (void *cls,
697 GNUNET_PeerIdentity * peer,
698 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
703 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
704 "Core told us that we are connecting to `%s'\n",
707 if (0 == memcmp(&my_identity, peer, sizeof(struct GNUNET_PeerIdentity)))
711 GNUNET_STATISTICS_set (stats,
712 gettext_noop ("# peers connected"),
715 pos = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
718 pos = make_peer (peer, NULL, GNUNET_NO);
719 GNUNET_break (GNUNET_OK == is_connection_allowed (pos));
723 GNUNET_assert (GNUNET_NO == pos->is_connected);
724 pos->greylisted_until.abs_value = 0; /* remove greylisting */
726 pos->is_connected = GNUNET_YES;
727 pos->connect_attempts = 0; /* re-set back-off factor */
730 if ( (friend_count == minimum_friend_count - 1) &&
731 (GNUNET_YES != friends_only) )
734 GNUNET_STATISTICS_set (stats,
735 gettext_noop ("# friends connected"),
739 reschedule_hellos (NULL, &peer->hashPubKey, pos);
744 * Try to add more peers to our connection set.
746 * @param cls closure, not used
747 * @param pid identity of a peer
748 * @param value 'struct Peer*' for the peer
749 * @return GNUNET_YES (continue to iterate)
752 try_add_peers (void *cls,
753 const GNUNET_HashCode *pid,
756 struct Peer *pos = value;
758 attempt_connect (pos);
764 * Method called whenever a peer disconnects.
767 * @param peer peer identity this notification is about
770 disconnect_notify (void *cls,
772 GNUNET_PeerIdentity * peer)
776 if (0 == memcmp(&my_identity, peer, sizeof(struct GNUNET_PeerIdentity)))
779 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
780 "Core told us that we disconnected from `%s'\n",
783 pos = GNUNET_CONTAINER_multihashmap_get (peers,
790 if (pos->is_connected != GNUNET_YES)
796 GNUNET_STATISTICS_set (stats,
797 gettext_noop ("# peers connected"),
803 GNUNET_STATISTICS_set (stats,
804 gettext_noop ("# friends connected"),
808 if ( (connection_count < target_connection_count) ||
809 (friend_count < minimum_friend_count) )
810 GNUNET_CONTAINER_multihashmap_iterate (peers,
813 if ( (friend_count < minimum_friend_count) &&
814 (blacklist == NULL) )
815 blacklist = GNUNET_TRANSPORT_blacklist (cfg,
816 &blacklist_check, NULL);
821 * Iterator called on each address.
823 * @param cls flag that we will set if we see any addresses
824 * @param tname name of the transport
825 * @param expiration when will the given address expire
826 * @param addr the address of the peer
827 * @param addrlen number of bytes in addr
828 * @return GNUNET_SYSERR always, to terminate iteration
831 address_iterator (void *cls,
833 struct GNUNET_TIME_Absolute expiration,
839 return GNUNET_SYSERR;
844 * We've gotten a HELLO from another peer. Consider it for
847 * @param hello the HELLO we got
850 consider_for_advertising (const struct GNUNET_HELLO_Message *hello)
853 struct GNUNET_PeerIdentity pid;
854 struct GNUNET_TIME_Absolute dt;
855 struct GNUNET_HELLO_Message *nh;
859 if (GNUNET_OK != GNUNET_HELLO_get_id (hello, &pid))
864 if (0 == memcmp (&pid,
866 sizeof (struct GNUNET_PeerIdentity)))
867 return; /* that's me! */
868 have_address = GNUNET_NO;
869 GNUNET_HELLO_iterate_addresses (hello,
873 if (GNUNET_NO == have_address)
874 return; /* no point in advertising this one... */
875 peer = GNUNET_CONTAINER_multihashmap_get (peers,
879 peer = make_peer (&pid, hello, GNUNET_NO);
881 else if (peer->hello != NULL)
883 dt = GNUNET_HELLO_equals (peer->hello,
885 GNUNET_TIME_absolute_get());
886 if (dt.abs_value == GNUNET_TIME_UNIT_FOREVER_ABS.abs_value)
887 return; /* nothing new here */
890 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
891 "Found `%s' from peer `%s' for advertising\n",
895 if (peer->hello != NULL)
897 nh = GNUNET_HELLO_merge (peer->hello,
899 GNUNET_free (peer->hello);
904 size = GNUNET_HELLO_size (hello);
905 peer->hello = GNUNET_malloc (size);
906 memcpy (peer->hello, hello, size);
908 if (peer->filter != NULL)
909 GNUNET_CONTAINER_bloomfilter_free (peer->filter);
911 /* since we have a new HELLO to pick from, re-schedule all
912 HELLO requests that are not bound by the HELLO send rate! */
913 GNUNET_CONTAINER_multihashmap_iterate (peers,
920 * PEERINFO calls this function to let us know about a possible peer
921 * that we might want to connect to.
923 * @param cls closure (not used)
924 * @param peer potential peer to connect to
925 * @param hello HELLO for this peer (or NULL)
928 process_peer (void *cls,
929 const struct GNUNET_PeerIdentity *peer,
930 const struct GNUNET_HELLO_Message *hello)
934 GNUNET_assert (peer != NULL);
935 if (0 == memcmp (&my_identity,
936 peer, sizeof (struct GNUNET_PeerIdentity)))
937 return; /* that's me! */
940 /* free existing HELLO, if any */
941 pos = GNUNET_CONTAINER_multihashmap_get (peers,
945 GNUNET_free_non_null (pos->hello);
947 if (pos->filter != NULL)
949 GNUNET_CONTAINER_bloomfilter_free (pos->filter);
952 if ( (! pos->is_connected) &&
953 (! pos->is_friend) &&
954 (0 == GNUNET_TIME_absolute_get_remaining (pos->greylisted_until).rel_value) )
955 free_peer (NULL, &pos->pid.hashPubKey, pos);
959 consider_for_advertising (hello);
960 pos = GNUNET_CONTAINER_multihashmap_get (peers,
963 pos = make_peer (peer, hello, GNUNET_NO);
964 GNUNET_assert (NULL != pos);
965 if (GNUNET_YES == pos->is_connected)
968 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
969 "Already connected to peer `%s'\n",
974 if (GNUNET_TIME_absolute_get_remaining (pos->greylisted_until).rel_value > 0)
977 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
978 "Already tried peer `%s' recently\n",
981 return; /* peer still greylisted */
984 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
985 "Considering connecting to peer `%s'\n",
988 attempt_connect (pos);
993 * Function called after GNUNET_CORE_connect has succeeded
994 * (or failed for good).
997 * @param server handle to the server, NULL if we failed
998 * @param my_id ID of this peer, NULL if we failed
999 * @param publicKey public key of this peer, NULL if we failed
1002 core_init (void *cls,
1003 struct GNUNET_CORE_Handle * server,
1004 const struct GNUNET_PeerIdentity *
1007 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *
1012 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1013 _("Failed to connect to core service, can not manage topology!\n"));
1014 GNUNET_SCHEDULER_shutdown ();
1018 my_identity = *my_id;
1020 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1022 GNUNET_i2s (my_id));
1024 peerinfo_notify = GNUNET_PEERINFO_notify (cfg, &process_peer,
1030 * Read the friends file.
1033 read_friends_file (const struct GNUNET_CONFIGURATION_Handle *cfg)
1038 struct GNUNET_PeerIdentity pid;
1040 struct GNUNET_CRYPTO_HashAsciiEncoded enc;
1041 unsigned int entries_found;
1045 GNUNET_CONFIGURATION_get_value_filename (cfg,
1050 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1051 _("Option `%s' in section `%s' not specified!\n"),
1056 if (GNUNET_OK != GNUNET_DISK_file_test (fn))
1057 GNUNET_DISK_fn_write (fn, NULL, 0,
1058 GNUNET_DISK_PERM_USER_READ
1059 | GNUNET_DISK_PERM_USER_WRITE);
1060 if (0 != STAT (fn, &frstat))
1062 if ((friends_only) || (minimum_friend_count > 0))
1063 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1064 _("Could not read friends list `%s'\n"), fn);
1068 if (frstat.st_size == 0)
1070 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1071 _("Friends file `%s' is empty.\n"),
1076 data = GNUNET_malloc_large (frstat.st_size);
1079 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1080 _("Failed to read friends list from `%s': out of memory\n"), fn);
1084 if (frstat.st_size !=
1085 GNUNET_DISK_fn_read (fn, data, frstat.st_size))
1087 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1088 _("Failed to read friends list from `%s'\n"), fn);
1095 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1097 while ((frstat.st_size >= sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)) &&
1098 (pos <= frstat.st_size - sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)))
1100 memcpy (&enc, &data[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
1101 if (!isspace ( (unsigned char) enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1]))
1103 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1104 _("Syntax error in topology specification at offset %llu, skipping bytes.\n"),
1105 (unsigned long long) pos);
1107 while ((pos < frstat.st_size) && (!isspace ( (unsigned char) data[pos])))
1111 enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
1112 if (GNUNET_OK != GNUNET_CRYPTO_hash_from_string ((char *) &enc, &pid.hashPubKey))
1114 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1115 _("Syntax error in topology specification at offset %llu, skipping bytes `%s'.\n"),
1116 (unsigned long long) pos,
1121 if (0 != memcmp (&pid,
1123 sizeof (struct GNUNET_PeerIdentity)))
1126 fl = make_peer (&pid,
1129 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1130 _("Found friend `%s' in configuration\n"),
1131 GNUNET_i2s (&fl->pid));
1135 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1136 _("Found myself `%s' in friend list (useless, ignored)\n"),
1140 pos = pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded);
1141 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1146 GNUNET_STATISTICS_update (stats,
1147 gettext_noop ("# friends in configuration"),
1150 if ( (minimum_friend_count > entries_found) &&
1151 (friends_only == GNUNET_NO) )
1153 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1154 _("Fewer friends specified than required by minimum friend count. Will only connect to friends.\n"));
1156 if ( (minimum_friend_count > target_connection_count) &&
1157 (friends_only == GNUNET_NO) )
1159 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1160 _("More friendly connections required than target total number of connections.\n"));
1166 * This function is called whenever an encrypted HELLO message is
1169 * @param cls closure
1170 * @param other the other peer involved (sender or receiver, NULL
1171 * for loopback messages where we are both sender and receiver)
1172 * @param message the actual HELLO message
1173 * @param atsi performance data
1174 * @return GNUNET_OK to keep the connection open,
1175 * GNUNET_SYSERR to close it (signal serious error)
1178 handle_encrypted_hello (void *cls,
1179 const struct GNUNET_PeerIdentity * other,
1180 const struct GNUNET_MessageHeader *
1182 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1185 struct GNUNET_PeerIdentity pid;
1188 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1189 "Received encrypted `%s' from peer `%s'",
1191 GNUNET_i2s (other));
1194 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message*) message,
1197 GNUNET_break_op (0);
1198 return GNUNET_SYSERR;
1200 GNUNET_STATISTICS_update (stats,
1201 gettext_noop ("# HELLO messages received"),
1204 peer = GNUNET_CONTAINER_multihashmap_get (peers,
1208 if ( (GNUNET_YES == friends_only) ||
1209 (friend_count < minimum_friend_count) )
1214 if ( (GNUNET_YES != peer->is_friend) &&
1215 (GNUNET_YES == friends_only) )
1217 if ( (GNUNET_YES != peer->is_friend) &&
1218 (friend_count < minimum_friend_count) )
1221 if (transport != NULL)
1222 GNUNET_TRANSPORT_offer_hello (transport,
1229 * Function to fill send buffer with HELLO.
1231 * @param cls 'struct Peer' of the target peer
1232 * @param size number of bytes available in buf
1233 * @param buf where the callee should write the message
1234 * @return number of bytes written to buf
1237 hello_advertising_ready (void *cls,
1241 struct Peer *pl = cls;
1242 struct FindAdvHelloContext fah;
1245 pl->hello_req = NULL;
1246 /* find applicable HELLOs */
1249 fah.max_size = size;
1250 fah.next_adv = GNUNET_TIME_UNIT_FOREVER_REL;
1251 GNUNET_CONTAINER_multihashmap_iterate (peers,
1252 &find_advertisable_hello,
1255 if (fah.result != NULL)
1257 want = GNUNET_HELLO_size (fah.result->hello);
1258 GNUNET_assert (want <= size);
1259 memcpy (buf, fah.result->hello, want);
1260 GNUNET_CONTAINER_bloomfilter_add (fah.result->filter,
1261 &pl->pid.hashPubKey);
1263 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1264 "Sending `%s' with %u bytes",
1266 (unsigned int) want);
1268 GNUNET_STATISTICS_update (stats,
1269 gettext_noop ("# HELLO messages gossipped"),
1273 pl->next_hello_allowed = GNUNET_TIME_relative_to_absolute (HELLO_ADVERTISEMENT_MIN_FREQUENCY);
1274 pl->hello_delay_task
1275 = GNUNET_SCHEDULER_add_now (&schedule_next_hello,
1282 * Last task run during shutdown. Disconnects us from
1283 * the transport and core.
1285 * @param cls unused, NULL
1286 * @param tc scheduler context
1289 cleaning_task (void *cls,
1290 const struct GNUNET_SCHEDULER_TaskContext *tc)
1292 if (NULL != peerinfo_notify)
1294 GNUNET_PEERINFO_notify_cancel (peerinfo_notify);
1295 peerinfo_notify = NULL;
1297 GNUNET_TRANSPORT_disconnect (transport);
1299 GNUNET_CONTAINER_multihashmap_iterate (peers,
1302 GNUNET_CONTAINER_multihashmap_destroy (peers);
1305 GNUNET_CORE_disconnect (handle);
1311 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
1318 * Main function that will be run.
1320 * @param cls closure
1321 * @param args remaining command-line arguments
1322 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
1323 * @param c configuration
1328 const char *cfgfile,
1329 const struct GNUNET_CONFIGURATION_Handle * c)
1331 struct GNUNET_CORE_MessageHandler handlers[] =
1333 { &handle_encrypted_hello, GNUNET_MESSAGE_TYPE_HELLO, 0},
1336 unsigned long long opt;
1339 stats = GNUNET_STATISTICS_create ("topology", cfg);
1340 autoconnect = GNUNET_CONFIGURATION_get_value_yesno (cfg,
1343 friends_only = GNUNET_CONFIGURATION_get_value_yesno (cfg,
1347 GNUNET_CONFIGURATION_get_value_number (cfg,
1352 minimum_friend_count = (unsigned int) opt;
1354 GNUNET_CONFIGURATION_get_value_number (cfg,
1356 "TARGET-CONNECTION-COUNT",
1359 target_connection_count = (unsigned int) opt;
1360 peers = GNUNET_CONTAINER_multihashmap_create (target_connection_count * 2);
1362 if ( (friends_only == GNUNET_YES) ||
1363 (minimum_friend_count > 0) )
1364 read_friends_file (cfg);
1366 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1367 "Topology would like %u connections with at least %u friends (%s)\n",
1368 target_connection_count,
1369 minimum_friend_count,
1370 autoconnect ? "autoconnect enabled" : "autoconnect disabled");
1372 if (friend_count < minimum_friend_count)
1373 blacklist = GNUNET_TRANSPORT_blacklist (cfg,
1374 &blacklist_check, NULL);
1375 transport = GNUNET_TRANSPORT_connect (cfg,
1381 handle = GNUNET_CORE_connect (cfg,
1391 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
1392 &cleaning_task, NULL);
1393 if (NULL == transport)
1395 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1396 _("Failed to connect to `%s' service.\n"),
1398 GNUNET_SCHEDULER_shutdown ();
1403 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1404 _("Failed to connect to `%s' service.\n"),
1406 GNUNET_SCHEDULER_shutdown ();
1413 * The main function for the topology daemon.
1415 * @param argc number of arguments from the command line
1416 * @param argv command line arguments
1417 * @return 0 ok, 1 on error
1420 main (int argc, char *const *argv)
1422 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
1423 GNUNET_GETOPT_OPTION_END
1428 GNUNET_PROGRAM_run (argc,
1431 _("GNUnet topology control (maintaining P2P mesh and F2F constraints)"),
1433 &run, NULL)) ? 0 : 1;
1437 /* end of gnunet-daemon-topology.c */