2 This file is part of GNUnet.
3 (C) 2007, 2008, 2009 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 2, 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 topology/gnunet-daemon-topology.c
23 * @brief code for maintaining the mesh topology
24 * @author Christian Grothoff
29 #include "gnunet_core_service.h"
30 #include "gnunet_protocols.h"
31 #include "gnunet_peerinfo_service.h"
32 #include "gnunet_transport_service.h"
33 #include "gnunet_util_lib.h"
36 #define DEBUG_TOPOLOGY GNUNET_YES
39 * For how long do we blacklist a peer after a failed
42 #define BLACKLIST_AFTER_ATTEMPT GNUNET_TIME_UNIT_HOURS
45 * For how long do we blacklist a friend after a failed
48 #define BLACKLIST_AFTER_ATTEMPT_FRIEND GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
51 * How frequently are we allowed to ask PEERINFO for more
52 * HELLO's to advertise (at most)?
54 #define MIN_HELLO_GATHER_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 27)
57 * How often do we at most advertise the same HELLO to the same peer?
58 * Also used to remove HELLOs of peers that PEERINFO no longer lists
61 #define HELLO_ADVERTISEMENT_MIN_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
65 * List of neighbours, friends and blacklisted peers.
71 * This is a linked list.
73 struct PeerList *next;
76 * Is this peer listed here because he is a friend?
81 * Are we connected to this peer right now?
86 * Until what time should we not try to connect again
89 struct GNUNET_TIME_Absolute blacklisted_until;
92 * Last time we transmitted a HELLO to this peer?
94 struct GNUNET_TIME_Absolute last_hello_sent;
99 struct GNUNET_PeerIdentity id;
105 * List of HELLOs we may consider for advertising.
110 * This is a linked list.
112 struct HelloList *next;
115 * Pointer to the HELLO message. Memory allocated as part
116 * of the "struct HelloList" --- do not free!
118 struct GNUNET_HELLO_Message *msg;
121 * Bloom filter used to mark which peers already got
124 struct GNUNET_CONTAINER_BloomFilter *filter;
127 * What peer is this HELLO for?
129 struct GNUNET_PeerIdentity id;
132 * When should we remove this entry from the linked list (either
133 * resetting the filter or possibly eliminating it for good because
134 * we no longer consider the peer to be participating in the
137 struct GNUNET_TIME_Absolute expiration;
142 * Linked list of HELLOs for advertising.
144 static struct HelloList *hellos;
149 static struct GNUNET_SCHEDULER_Handle * sched;
154 static const struct GNUNET_CONFIGURATION_Handle * cfg;
157 * Handle to the core API.
159 static struct GNUNET_CORE_Handle *handle;
162 * Handle to the transport API.
164 static struct GNUNET_TRANSPORT_Handle *transport;
167 * Identity of this peer.
169 static struct GNUNET_PeerIdentity my_identity;
172 * Linked list of all of our friends and all of our current
175 static struct PeerList *friends;
178 * Timestamp from the last time we tried to gather HELLOs.
180 static struct GNUNET_TIME_Absolute last_hello_gather_time;
183 * Flag to disallow non-friend connections (pure F2F mode).
185 static int friends_only;
188 * Minimum number of friends to have in the
189 * connection set before we allow non-friends.
191 static unsigned int minimum_friend_count;
194 * Number of peers (friends and others) that we are currently connected to.
196 static unsigned int connection_count;
199 * Target number of connections.
201 static unsigned int target_connection_count;
204 * Number of friends that we are currently connected to.
206 static unsigned int friend_count;
209 * Should the topology daemon try to establish connections?
211 static int autoconnect;
214 * Are we currently having a request pending with
215 * PEERINFO asking for HELLOs for advertising?
217 static int hello_gathering_active;
222 * Force a disconnect from the specified peer.
225 force_disconnect (const struct GNUNET_PeerIdentity *peer)
227 GNUNET_CORE_peer_configure (handle,
229 GNUNET_TIME_UNIT_FOREVER_REL,
239 * Function called by core when our attempt to connect
240 * succeeded. Does nothing.
243 ready_callback (void *cls,
244 size_t size, void *buf)
247 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
249 ? "Core told us that our attempt to connect failed.\n"
250 : "Core told us that our attempt to connect worked. Good!\n");
257 * Try to connect to the specified peer.
259 * @param peer who we should try to connect to
260 * @param pos entry in our friend list; NULL if not in friend list yet
263 attempt_connect (const struct GNUNET_PeerIdentity *peer,
264 struct PeerList *pos)
271 if (0 == memcmp (&pos->id, peer, sizeof (struct GNUNET_PeerIdentity)))
277 pos = GNUNET_malloc (sizeof(struct PeerList));
282 if (GNUNET_YES == pos->is_friend)
283 pos->blacklisted_until = GNUNET_TIME_relative_to_absolute (BLACKLIST_AFTER_ATTEMPT_FRIEND);
285 pos->blacklisted_until = GNUNET_TIME_relative_to_absolute (BLACKLIST_AFTER_ATTEMPT);
287 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
288 "Asking core to connect to `%s'\n",
291 GNUNET_CORE_notify_transmit_ready (handle,
293 GNUNET_TIME_UNIT_MINUTES,
295 sizeof(struct GNUNET_MessageHeader),
302 * Is this peer one of our friends?
305 is_friend (const struct GNUNET_PeerIdentity * peer)
307 struct PeerList *pos;
312 if ( (GNUNET_YES == pos->is_friend) &&
313 (0 == memcmp (&pos->id, peer, sizeof (struct GNUNET_PeerIdentity))) )
316 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
317 "Determined that `%s' is a friend\n",
329 * Check if an additional connection from the given peer is allowed.
332 is_connection_allowed (const struct GNUNET_PeerIdentity * peer)
334 if (0 == memcmp (&my_identity, peer, sizeof (struct GNUNET_PeerIdentity)))
335 return GNUNET_SYSERR; /* disallow connections to self */
336 if (is_friend (peer))
338 if (GNUNET_YES == friends_only)
341 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
342 "Determined that `%s' is not allowed to connect (not a friend)\n",
345 return GNUNET_SYSERR;
347 if (friend_count >= minimum_friend_count)
350 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
351 "Determined that `%s' is not allowed to connect (not enough connected friends)\n",
354 return GNUNET_SYSERR;
359 * Method called whenever a peer connects.
362 * @param peer peer identity this notification is about
364 static void connect_notify (void *cls,
366 GNUNET_PeerIdentity * peer)
368 struct PeerList *pos;
371 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
372 "Core told us that we connected to `%s'\n",
379 if ( (GNUNET_YES == pos->is_friend) &&
380 (0 == memcmp (&pos->id, peer, sizeof (struct GNUNET_PeerIdentity))) )
382 GNUNET_assert (GNUNET_NO == pos->is_connected);
383 pos->is_connected = GNUNET_YES;
384 pos->blacklisted_until.value = 0; /* remove blacklisting */
390 pos = GNUNET_malloc (sizeof(struct PeerList));
392 pos->is_connected = GNUNET_YES;
395 if (GNUNET_OK != is_connection_allowed (peer))
398 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
399 "Connection to `%s' is forbidden, forcing disconnect!\n",
402 force_disconnect (peer);
408 * Disconnect from all non-friends (we're below quota).
413 struct PeerList *pos;
418 if (GNUNET_NO == pos->is_friend)
420 GNUNET_assert (GNUNET_YES == pos->is_connected);
422 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
423 "Connection to `%s' is not from a friend, forcing disconnect!\n",
424 GNUNET_i2s (&pos->id));
426 force_disconnect (&pos->id);
434 * Method called whenever a peer disconnects.
437 * @param peer peer identity this notification is about
439 static void disconnect_notify (void *cls,
441 GNUNET_PeerIdentity * peer)
443 struct PeerList *pos;
444 struct PeerList *prev;
447 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
448 "Core told us that we disconnected from `%s'\n",
456 if (0 == memcmp (&pos->id, peer, sizeof (struct GNUNET_PeerIdentity)))
458 GNUNET_assert (GNUNET_YES == pos->is_connected);
459 pos->is_connected = GNUNET_NO;
460 if (GNUNET_YES == pos->is_friend)
463 if (friend_count < minimum_friend_count)
465 /* disconnect from all non-friends */
467 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
468 "Not enough friendly connections, dropping all non-friend connections\n");
471 attempt_connect (peer, pos);
480 prev->next = pos->next;
493 * Find more peers that we should connect to and ask the
494 * core to establish connections.
497 find_more_peers (void *cls,
498 const struct GNUNET_SCHEDULER_TaskContext *tc);
502 * Determine when we should try again to find more peers and
506 schedule_peer_search ()
508 struct GNUNET_TIME_Relative delay;
510 /* Typically, we try again every 15 minutes; the minimum period is
511 15s; if we are above the connection target, we reduce re-trying
512 by the square of how much we are above; so for example, with 200%
513 of the connection target we would only look for more peers once
514 every hour (after all, we're quite busy processing twice as many
515 connections as we intended to have); similarly, if we are at only
516 25% of our connectivity goal, we will try 16x as hard to connect
517 (so roughly once a minute, plus the 15s minimum delay */
518 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
519 15 + 15 * 60 * connection_count * connection_count / target_connection_count / target_connection_count);
521 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
522 "Will try to find more peers in %llums\n",
523 (unsigned long long) delay.value);
525 GNUNET_SCHEDULER_add_delayed (sched,
527 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
528 GNUNET_SCHEDULER_NO_TASK,
538 * Iterator called on each address.
540 * @param cls flag that we will set if we see any addresses
541 * @param tname name of the transport
542 * @param expiration when will the given address expire
543 * @param addr the address of the peer
544 * @param addrlen number of bytes in addr
545 * @return GNUNET_SYSERR always, to terminate iteration
548 address_iterator (void *cls,
550 struct GNUNET_TIME_Absolute expiration,
551 const void *addr, size_t addrlen)
555 return GNUNET_SYSERR;
560 * We've gotten a HELLO from another peer.
561 * Consider it for advertising.
564 consider_for_advertising (const struct GNUNET_HELLO_Message *hello)
567 struct GNUNET_PeerIdentity pid;
568 struct HelloList *pos;
571 have_address = GNUNET_NO;
572 GNUNET_HELLO_iterate_addresses (hello,
576 if (GNUNET_NO == have_address)
577 return; /* no point in advertising this one... */
578 GNUNET_break (GNUNET_OK == GNUNET_HELLO_get_id (hello, &pid));
582 if (0 == memcmp (&pos->id,
584 sizeof(struct GNUNET_PeerIdentity)))
585 return; /* duplicate, at least "mostly" */
589 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
590 "Found `%s' from peer `%s' for advertising\n",
594 size = GNUNET_HELLO_size (hello);
595 pos = GNUNET_malloc (sizeof(struct HelloList) + size);
596 pos->msg = (struct GNUNET_HELLO_Message*) &pos[1];
597 memcpy (&pos->msg, hello, size);
599 pos->expiration = GNUNET_TIME_relative_to_absolute (HELLO_ADVERTISEMENT_MIN_FREQUENCY);
600 /* 2^{-5} chance of not sending a HELLO to a peer is
601 acceptably small (if the filter is 50% full);
602 64 bytes of memory are small compared to the rest
603 of the data structure and would only really become
604 "useless" once a HELLO has been passed on to ~100
605 other peers, which is likely more than enough in
606 any case; hence 64, 5 as bloomfilter parameters. */
607 pos->filter = GNUNET_CONTAINER_bloomfilter_load (NULL, 64, 5);
608 /* never send a peer its own HELLO */
609 GNUNET_CONTAINER_bloomfilter_add (pos->filter, &pos->id.hashPubKey);
616 * Peerinfo calls this function to let us know about a
617 * possible peer that we might want to connect to.
620 process_peer (void *cls,
621 const struct GNUNET_PeerIdentity *peer,
622 const struct GNUNET_HELLO_Message *hello,
625 struct PeerList *pos;
629 /* last call, schedule 'find_more_peers' again... */
630 schedule_peer_search ();
635 /* no HELLO known; can not connect, ignore! */
638 if (0 == memcmp (&my_identity,
639 peer, sizeof (struct GNUNET_PeerIdentity)))
640 return; /* that's me! */
642 consider_for_advertising (hello);
644 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
645 "Considering connecting to peer `%s'\n",
651 if (0 == memcmp (&pos->id, peer, sizeof (struct GNUNET_PeerIdentity)))
653 if (GNUNET_YES == pos->is_connected)
656 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
657 "Already connected to peer `%s'\n",
662 if (GNUNET_TIME_absolute_get_remaining (pos->blacklisted_until).value > 0)
665 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
666 "Already tried peer `%s' recently\n",
669 return; /* peer still blacklisted */
671 if (GNUNET_YES == pos->is_friend)
673 attempt_connect (peer, pos);
679 if ( (GNUNET_YES == friends_only) ||
680 (friend_count < minimum_friend_count) )
683 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
684 "Peer `%s' is not a friend, and we currently only connect to friends\n",
689 attempt_connect (peer, NULL);
694 * Try to add more friends to our connection set.
699 struct PeerList *pos;
702 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
703 "Considering all of our friends for new connections\n");
708 if ( (GNUNET_TIME_absolute_get_remaining (pos->blacklisted_until).value == 0) &&
709 (GNUNET_YES == pos->is_friend) &&
710 (GNUNET_YES != pos->is_connected) )
711 attempt_connect (&pos->id, pos);
718 * Discard peer entries for blacklisted peers
719 * where the blacklisting has expired.
722 discard_old_blacklist_entries ()
724 struct PeerList *pos;
725 struct PeerList *next;
726 struct PeerList *prev;
730 while (NULL != (pos = next))
733 if ( (GNUNET_NO == pos->is_friend) &&
734 (GNUNET_NO == pos->is_connected) &&
735 (0 == GNUNET_TIME_absolute_get_remaining (pos->blacklisted_until).value) )
737 /* delete 'pos' from list */
739 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
740 "Deleting peer `%s' from our list (not connected, not a friend and blacklist expired)\n",
741 GNUNET_i2s (&pos->id));
758 * Find more peers that we should connect to and ask the
759 * core to establish connections.
762 find_more_peers (void *cls,
763 const struct GNUNET_SCHEDULER_TaskContext *tc)
765 discard_old_blacklist_entries ();
766 if (connection_count <= target_connection_count)
768 schedule_peer_search ();
771 if ( (GNUNET_YES == friends_only) ||
772 (friend_count < minimum_friend_count) )
775 schedule_peer_search ();
779 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
780 "Got sufficient (%u/%u, %u friends) number of connections, won't try to create more.\n",
782 target_connection_count,
785 GNUNET_PEERINFO_for_all (cfg,
788 0, GNUNET_TIME_UNIT_FOREVER_REL,
789 &process_peer, NULL);
794 * Function called after GNUNET_CORE_connect has succeeded
795 * (or failed for good).
798 * @param server handle to the server, NULL if we failed
799 * @param my_id ID of this peer, NULL if we failed
800 * @param publicKey public key of this peer, NULL if we failed
803 core_init (void *cls,
804 struct GNUNET_CORE_Handle * server,
805 const struct GNUNET_PeerIdentity *
808 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *
813 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
814 _("Failed to connect to core service, can not manage topology!\n"));
818 my_identity = *my_id;
820 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
825 GNUNET_SCHEDULER_add_delayed (sched,
827 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
828 GNUNET_SCHEDULER_NO_TASK,
829 GNUNET_TIME_UNIT_SECONDS /* give core time to tell us about existing connections */,
836 * gnunet-daemon-topology command line options.
838 static struct GNUNET_GETOPT_CommandLineOption options[] = {
839 GNUNET_GETOPT_OPTION_END
844 * Read the friends file.
847 read_friends_file (const struct GNUNET_CONFIGURATION_Handle *cfg)
854 struct GNUNET_CRYPTO_HashAsciiEncoded enc;
855 unsigned int entries_found;
859 GNUNET_CONFIGURATION_get_value_filename (cfg,
864 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
865 _("Option `%s' in section `%s' not specified!\n"),
870 if (GNUNET_OK != GNUNET_DISK_file_test (fn))
871 GNUNET_DISK_fn_write (fn, NULL, 0, GNUNET_DISK_PERM_USER_READ
872 | GNUNET_DISK_PERM_USER_WRITE);
873 if (0 != STAT (fn, &frstat))
875 if ((friends_only) || (minimum_friend_count > 0))
877 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
878 _("Could not read friends list `%s'\n"), fn);
883 if (frstat.st_size == 0)
885 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
886 _("Friends file `%s' is empty.\n"),
891 data = GNUNET_malloc_large (frstat.st_size);
892 if (frstat.st_size !=
893 GNUNET_DISK_fn_read (fn, data, frstat.st_size))
895 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
896 _("Failed to read friends list from `%s'\n"), fn);
903 while ((pos < frstat.st_size) && isspace (data[pos]))
905 while ((frstat.st_size >= sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)) &&
906 (pos <= frstat.st_size - sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)))
908 memcpy (&enc, &data[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
909 if (!isspace (enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1]))
911 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
912 _("Syntax error in topology specification at offset %llu, skipping bytes.\n"),
913 (unsigned long long) pos);
915 while ((pos < frstat.st_size) && (!isspace (data[pos])))
919 enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
920 if (GNUNET_OK != GNUNET_CRYPTO_hash_from_string ((char *) &enc, &hc))
922 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
923 _("Syntax error in topology specification at offset %llu, skipping bytes `%s'.\n"),
924 (unsigned long long) pos,
930 fl = GNUNET_malloc (sizeof(struct PeerList));
931 fl->is_friend = GNUNET_YES;
932 fl->id.hashPubKey = hc;
936 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
937 "Found friend `%s' in configuration\n",
938 GNUNET_i2s (&fl->id));
941 pos = pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded);
942 while ((pos < frstat.st_size) && isspace (data[pos]))
947 if ( (minimum_friend_count > entries_found) &&
948 (friends_only == GNUNET_NO) )
950 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
951 _("Fewer friends specified than required by minimum friend count. Will only connect to friends.\n"));
953 if ( (minimum_friend_count > target_connection_count) &&
954 (friends_only == GNUNET_NO) )
956 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
957 _("More friendly connections required than target total number of connections.\n"));
963 * This function is called whenever an encrypted HELLO message is
967 * @param other the other peer involved (sender or receiver, NULL
968 * for loopback messages where we are both sender and receiver)
969 * @param message the actual HELLO message
970 * @return GNUNET_OK to keep the connection open,
971 * GNUNET_SYSERR to close it (signal serious error)
974 handle_encrypted_hello (void *cls,
975 const struct GNUNET_PeerIdentity * other,
976 const struct GNUNET_MessageHeader *
980 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
981 "Received encrypted `%s' from peer `%s'",
985 if (transport != NULL)
986 GNUNET_TRANSPORT_offer_hello (transport,
993 * Peerinfo calls this function to let us know about a
994 * possible peer that we might want to connect to.
997 * @param peer NULL for the end of the list, otherwise a peer identity
998 * @param hello a HELLO for a peer, or NULL
999 * @param trust how much do we trust the given peer?
1002 gather_hello_callback (void *cls,
1003 const struct GNUNET_PeerIdentity *peer,
1004 const struct GNUNET_HELLO_Message *hello,
1009 hello_gathering_active = GNUNET_NO;
1013 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1014 "Received `%s' for peer `%s'",
1019 consider_for_advertising (hello);
1024 * Function to fill send buffer with HELLO.
1027 * @param receiver the receiver of the message
1028 * @param position is the reference to the
1029 * first unused position in the buffer where GNUnet is building
1031 * @param padding is the number of bytes left in that buffer.
1032 * @return the number of bytes written to
1033 * that buffer (must be a positive number).
1036 hello_advertising (void *cls,
1037 const struct GNUNET_PeerIdentity *
1042 struct PeerList *pl;
1043 struct HelloList *pos;
1044 struct HelloList *prev;
1045 struct HelloList *next;
1049 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1050 "Data solicited for `%s', considering sending `%s's",
1051 GNUNET_i2s (receiver),
1057 if (0 == memcmp (&pl->id, receiver, sizeof (struct GNUNET_PeerIdentity)))
1066 /* find applicable HELLOs */
1069 while (NULL != (pos = next))
1073 GNUNET_CONTAINER_bloomfilter_test (pos->filter,
1074 &receiver->hashPubKey))
1076 if (0 == GNUNET_TIME_absolute_get_remaining (pos->expiration).value)
1078 /* time to discard... */
1083 GNUNET_CONTAINER_bloomfilter_free (pos->filter);
1093 size = GNUNET_HELLO_size (pos->msg);
1096 memcpy (position, pos->msg, size);
1097 GNUNET_CONTAINER_bloomfilter_add (pos->filter,
1098 &receiver->hashPubKey);
1105 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1106 "Sending %u bytes of `%s's",
1107 (unsigned int) size,
1112 if ( (GNUNET_NO == hello_gathering_active) &&
1113 (GNUNET_TIME_absolute_get_duration (last_hello_gather_time).value >
1114 MIN_HELLO_GATHER_DELAY.value) )
1117 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1118 "Have no `%s's, trying to get some from `%s' for next time",
1122 hello_gathering_active = GNUNET_YES;
1123 last_hello_gather_time = GNUNET_TIME_absolute_get();
1124 GNUNET_PEERINFO_for_all (cfg,
1127 0, GNUNET_TIME_UNIT_FOREVER_REL,
1128 &gather_hello_callback, NULL);
1135 * Last task run during shutdown. Disconnects us from
1136 * the transport and core.
1139 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1141 struct PeerList *pl;
1143 GNUNET_TRANSPORT_disconnect (transport);
1145 GNUNET_CORE_disconnect (handle);
1147 while (NULL != (pl = friends))
1156 * Main function that will be run.
1158 * @param cls closure
1159 * @param s the scheduler to use
1160 * @param args remaining command-line arguments
1161 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
1162 * @param c configuration
1166 struct GNUNET_SCHEDULER_Handle * s,
1168 const char *cfgfile,
1169 const struct GNUNET_CONFIGURATION_Handle * c)
1171 struct GNUNET_CORE_MessageHandler handlers[] =
1173 { &handle_encrypted_hello, GNUNET_MESSAGE_TYPE_HELLO, 0},
1176 unsigned long long opt;
1180 autoconnect = GNUNET_CONFIGURATION_get_value_yesno (cfg,
1183 friends_only = GNUNET_CONFIGURATION_get_value_yesno (cfg,
1187 GNUNET_CONFIGURATION_get_value_number (cfg,
1192 minimum_friend_count = (unsigned int) opt;
1194 GNUNET_CONFIGURATION_get_value_number (cfg,
1196 "TARGET-CONNECTION-COUNT",
1199 target_connection_count = (unsigned int) opt;
1201 if ( (friends_only == GNUNET_YES) ||
1202 (minimum_friend_count > 0) )
1203 read_friends_file (cfg);
1205 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1206 "Topology would like %u connections with at least %u friends (%s)\n",
1207 target_connection_count,
1208 minimum_friend_count,
1209 autoconnect ? "autoconnect enabled" : "autoconnect disabled");
1211 transport = GNUNET_TRANSPORT_connect (sched,
1217 GNUNET_CORE_connect (sched,
1219 GNUNET_TIME_UNIT_FOREVER_REL,
1229 GNUNET_SCHEDULER_add_delayed (sched,
1231 GNUNET_SCHEDULER_PRIORITY_IDLE,
1232 GNUNET_SCHEDULER_NO_TASK,
1233 GNUNET_TIME_UNIT_FOREVER_REL,
1234 &cleaning_task, NULL);
1239 * The main function for the topology daemon.
1241 * @param argc number of arguments from the command line
1242 * @param argv command line arguments
1243 * @return 0 ok, 1 on error
1246 main (int argc, char *const *argv)
1251 GNUNET_PROGRAM_run (argc,
1254 _("GNUnet topology control (maintaining P2P mesh and F2F constraints)"),
1256 &run, NULL)) ? 0 : 1;
1260 /* end of gnunet-daemon-topology.c */