/*
This file is part of GNUnet.
- (C) 2007, 2008, 2009 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2007-2016 GNUnet e.V.
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 2, or (at your
+ by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
*/
/**
* @file topology/gnunet-daemon-topology.c
- * @brief code for bootstrapping via topology servers
+ * @brief code for maintaining the overlay topology
* @author Christian Grothoff
+ *
+ * This daemon combines three functions:
+ * - suggesting to ATS which peers we might want to connect to
+ * - enforcing the F2F restrictions (by blacklisting)
+ * - gossping HELLOs
+ *
+ * All three require similar information (who are our friends
+ * impacts connectivity suggestions; connectivity suggestions
+ * should consider blacklisting; connectivity suggestions
+ * should consider available/known HELLOs; gossip requires
+ * connectivity data; connectivity suggestions require
+ * connectivity data), which is why they are combined in this
+ * program.
*/
-
-#include <stdlib.h>
#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_friends_lib.h"
+#include "gnunet_constants.h"
#include "gnunet_core_service.h"
#include "gnunet_protocols.h"
#include "gnunet_peerinfo_service.h"
+#include "gnunet_statistics_service.h"
#include "gnunet_transport_service.h"
-#include "gnunet_util_lib.h"
-
-
-#define DEBUG_TOPOLOGY GNUNET_NO
-
-/**
- * For how long do we blacklist a peer after a failed
- * connection attempt?
- */
-#define BLACKLIST_AFTER_ATTEMPT GNUNET_TIME_UNIT_HOURS
+#include "gnunet_ats_service.h"
-/**
- * For how long do we blacklist a friend after a failed
- * connection attempt?
- */
-#define BLACKLIST_AFTER_ATTEMPT_FRIEND GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
/**
- * How frequently are we allowed to ask PEERINFO for more
- * HELLO's to advertise (at most)?
+ * At what frequency do we sent HELLOs to a peer?
*/
-#define MIN_HELLO_GATHER_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 27)
+#define HELLO_ADVERTISEMENT_MIN_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
/**
- * How often do we at most advertise the same HELLO to the same peer?
- * Also used to remove HELLOs of peers that PEERINFO no longer lists
- * from our cache.
+ * After what time period do we expire the HELLO Bloom filter?
*/
-#define HELLO_ADVERTISEMENT_MIN_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
+#define HELLO_ADVERTISEMENT_MIN_REPEAT_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 4)
/**
- * List of neighbours, friends and blacklisted peers.
+ * Record for neighbours, friends and blacklisted peers.
*/
-struct PeerList
+struct Peer
{
-
/**
- * This is a linked list.
+ * Which peer is this entry about?
*/
- struct PeerList *next;
+ struct GNUNET_PeerIdentity pid;
/**
- * Is this peer listed here because he is a friend?
+ * Our handle for transmitting to this peer; NULL
+ * if peer is not connected.
*/
- int is_friend;
+ struct GNUNET_MQ_Handle *mq;
/**
- * Are we connected to this peer right now?
+ * Pointer to the HELLO message of this peer; can be NULL.
*/
- int is_connected;
+ struct GNUNET_HELLO_Message *hello;
/**
- * Until what time should we not try to connect again
- * to this peer?
+ * Bloom filter used to mark which peers already got the HELLO
+ * from this peer.
*/
- struct GNUNET_TIME_Absolute blacklisted_until;
+ struct GNUNET_CONTAINER_BloomFilter *filter;
/**
- * Last time we transmitted a HELLO to this peer?
+ * Next time we are allowed to transmit a HELLO to this peer?
*/
- struct GNUNET_TIME_Absolute last_hello_sent;
+ struct GNUNET_TIME_Absolute next_hello_allowed;
/**
- * ID of the peer.
+ * When should we reset the bloom filter of this entry?
*/
- struct GNUNET_PeerIdentity id;
-
-};
-
+ struct GNUNET_TIME_Absolute filter_expiration;
-/**
- * List of HELLOs we may consider for advertising.
- */
-struct HelloList
-{
/**
- * This is a linked list.
+ * ID of task we use to wait for the time to send the next HELLO
+ * to this peer.
*/
- struct HelloList *next;
+ struct GNUNET_SCHEDULER_Task *hello_delay_task;
/**
- * Pointer to the HELLO message. Memory allocated as part
- * of the "struct HelloList" --- do not free!
+ * Handle for our connectivity suggestion for this peer.
*/
- struct GNUNET_HELLO_Message *msg;
+ struct GNUNET_ATS_ConnectivitySuggestHandle *sh;
/**
- * Bloom filter used to mark which peers already got
- * this HELLO.
+ * How much would we like to connect to this peer?
*/
- struct GNUNET_CONTAINER_BloomFilter *filter;
+ uint32_t strength;
/**
- * What peer is this HELLO for?
+ * Is this peer listed here because he is a friend?
*/
- struct GNUNET_PeerIdentity id;
+ int is_friend;
- /**
- * When should we remove this entry from the linked list (either
- * resetting the filter or possibly eliminating it for good because
- * we no longer consider the peer to be participating in the
- * network)?
- */
- struct GNUNET_TIME_Absolute expiration;
};
/**
- * Linked list of HELLOs for advertising.
+ * Our peerinfo notification context. We use notification
+ * to instantly learn about new peers as they are discovered.
*/
-static struct HelloList *hellos;
-
-/**
- * Our scheduler.
- */
-static struct GNUNET_SCHEDULER_Handle * sched;
+static struct GNUNET_PEERINFO_NotifyContext *peerinfo_notify;
/**
* Our configuration.
*/
-static const struct GNUNET_CONFIGURATION_Handle * cfg;
+static const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
- * Handle to the core API.
+ * Handle to the CORE service.
*/
static struct GNUNET_CORE_Handle *handle;
/**
- * Handle to the transport API.
+ * Handle to the ATS service.
*/
-static struct GNUNET_TRANSPORT_Handle *transport;
+static struct GNUNET_ATS_ConnectivityHandle *ats;
/**
* Identity of this peer.
static struct GNUNET_PeerIdentity my_identity;
/**
- * Linked list of all of our friends and all of our current
- * neighbours.
+ * All of our friends, all of our current neighbours and all peers for
+ * which we have HELLOs. So pretty much everyone. Maps peer identities
+ * to `struct Peer *` values.
*/
-static struct PeerList *friends;
+static struct GNUNET_CONTAINER_MultiPeerMap *peers;
/**
- * Timestamp from the last time we tried to gather HELLOs.
+ * Handle for reporting statistics.
*/
-static struct GNUNET_TIME_Absolute last_hello_gather_time;
+static struct GNUNET_STATISTICS_Handle *stats;
+
+/**
+ * Blacklist (NULL if we have none).
+ */
+static struct GNUNET_TRANSPORT_Blacklist *blacklist;
+
+/**
+ * Task scheduled to asynchronously reconsider adding/removing
+ * peer connectivity suggestions.
+ */
+static struct GNUNET_SCHEDULER_Task *add_task;
+
+/**
+ * Active HELLO offering to transport service.
+ */
+static struct GNUNET_TRANSPORT_OfferHelloHandle *oh;
/**
* Flag to disallow non-friend connections (pure F2F mode).
*/
static unsigned int friend_count;
-/**
- * Should the topology daemon try to establish connections?
- */
-static int autoconnect;
/**
- * Are we currently having a request pending with
- * PEERINFO asking for HELLOs for advertising?
+ * Function that decides if a connection is acceptable or not.
+ * If we have a blacklist, only friends are allowed, so the check
+ * is rather simple.
+ *
+ * @param cls closure
+ * @param pid peer to approve or disapprove
+ * @return #GNUNET_OK if the connection is allowed
*/
-static int hello_gathering_active;
+static int
+blacklist_check (void *cls,
+ const struct GNUNET_PeerIdentity *pid)
+{
+ struct Peer *pos;
+ pos = GNUNET_CONTAINER_multipeermap_get (peers,
+ pid);
+ if ( (NULL != pos) &&
+ (GNUNET_YES == pos->is_friend))
+ return GNUNET_OK;
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# peers blacklisted"),
+ 1,
+ GNUNET_NO);
+ return GNUNET_SYSERR;
+}
/**
- * Force a disconnect from the specified peer.
+ * Whitelist all peers that we blacklisted; we've passed
+ * the minimum number of friends.
*/
static void
-force_disconnect (const struct GNUNET_PeerIdentity *peer)
+whitelist_peers ()
{
- GNUNET_CORE_peer_configure (handle,
- peer,
- GNUNET_TIME_UNIT_FOREVER_REL,
- 0,
- 0,
- 0,
- NULL,
- NULL);
+ if (NULL != blacklist)
+ {
+ GNUNET_TRANSPORT_blacklist_cancel (blacklist);
+ blacklist = NULL;
+ }
}
/**
- * Function called by core when our attempt to connect
- * succeeded. Does nothing.
+ * Free all resources associated with the given peer.
+ *
+ * @param cls closure (not used)
+ * @param pid identity of the peer
+ * @param value peer to free
+ * @return #GNUNET_YES (always: continue to iterate)
*/
-static size_t
-ready_callback (void *cls,
- size_t size, void *buf)
+static int
+free_peer (void *cls,
+ const struct GNUNET_PeerIdentity * pid,
+ void *value)
{
- return 0;
+ struct Peer *pos = value;
+
+ GNUNET_break (NULL == pos->mq);
+ GNUNET_break (GNUNET_OK ==
+ GNUNET_CONTAINER_multipeermap_remove (peers,
+ pid,
+ pos));
+ if (NULL != pos->hello_delay_task)
+ {
+ GNUNET_SCHEDULER_cancel (pos->hello_delay_task);
+ pos->hello_delay_task = NULL;
+ }
+ if (NULL != pos->sh)
+ {
+ GNUNET_ATS_connectivity_suggest_cancel (pos->sh);
+ pos->sh = NULL;
+ }
+ if (NULL != pos->hello)
+ {
+ GNUNET_free_non_null (pos->hello);
+ pos->hello = NULL;
+ }
+ if (NULL != pos->filter)
+ {
+ GNUNET_CONTAINER_bloomfilter_free (pos->filter);
+ pos->filter = NULL;
+ }
+ GNUNET_free (pos);
+ return GNUNET_YES;
}
/**
- * Try to connect to the specified peer.
+ * Recalculate how much we want to be connected to the specified peer
+ * and let ATS know about the result.
*
- * @param pos NULL if not in friend list yet
+ * @param pos peer to consider connecting to
*/
static void
-attempt_connect (const struct GNUNET_PeerIdentity *peer,
- struct PeerList *pos)
+attempt_connect (struct Peer *pos)
{
- if (pos == NULL)
- {
- pos = friends;
- while (pos != NULL)
- {
- if (0 == memcmp (&pos->id, peer, sizeof (struct GNUNET_PeerIdentity)))
- break;
- }
- }
- if (pos == NULL)
- {
- pos = GNUNET_malloc (sizeof(struct PeerList));
- pos->id = *peer;
- pos->next = friends;
- friends = pos;
- }
- if (GNUNET_YES == pos->is_friend)
- pos->blacklisted_until = GNUNET_TIME_relative_to_absolute (BLACKLIST_AFTER_ATTEMPT_FRIEND);
+ uint32_t strength;
+
+ if (0 ==
+ memcmp (&my_identity,
+ &pos->pid,
+ sizeof (struct GNUNET_PeerIdentity)))
+ return; /* This is myself, nothing to do. */
+ if (connection_count < target_connection_count)
+ strength = 1;
else
- pos->blacklisted_until = GNUNET_TIME_relative_to_absolute (BLACKLIST_AFTER_ATTEMPT);
- GNUNET_CORE_notify_transmit_ready (handle,
- 0 /* priority */,
- GNUNET_TIME_UNIT_MINUTES,
- peer,
- sizeof(struct GNUNET_MessageHeader),
- &ready_callback,
- NULL);
+ strength = 0;
+ if ( (friend_count < minimum_friend_count) ||
+ (GNUNET_YES == friends_only) )
+ {
+ if (pos->is_friend)
+ strength += 10; /* urgently needed */
+ else
+ strength = 0; /* disallowed */
+ }
+ if (pos->is_friend)
+ strength *= 2; /* friends always count more */
+ if (NULL != pos->mq)
+ strength *= 2; /* existing connections preferred */
+ if (strength == pos->strength)
+ return; /* nothing to do */
+ if (NULL != pos->sh)
+ {
+ GNUNET_ATS_connectivity_suggest_cancel (pos->sh);
+ pos->sh = NULL;
+ }
+ pos->strength = strength;
+ if (0 != strength)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Asking to connect to `%s' with strength %u\n",
+ GNUNET_i2s (&pos->pid),
+ (unsigned int) strength);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# connect requests issued to ATS"),
+ 1,
+ GNUNET_NO);
+ pos->sh = GNUNET_ATS_connectivity_suggest (ats,
+ &pos->pid,
+ strength);
+ }
}
/**
- * Is this peer one of our friends?
+ * Create a new entry in the peer list.
+ *
+ * @param peer identity of the new entry
+ * @param hello hello message, can be NULL
+ * @param is_friend is the new entry for a friend?
+ * @return the new entry
*/
-static int
-is_friend (const struct GNUNET_PeerIdentity * peer)
+static struct Peer *
+make_peer (const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_HELLO_Message *hello,
+ int is_friend)
{
- struct PeerList *pos;
-
- pos = friends;
- while (pos != NULL)
- {
- if ( (GNUNET_YES == pos->is_friend) &&
- (0 == memcmp (&pos->id, peer, sizeof (struct GNUNET_PeerIdentity))) )
- return GNUNET_YES;
- pos = pos->next;
- }
- return GNUNET_NO;
+ struct Peer *ret;
+
+ ret = GNUNET_new (struct Peer);
+ ret->pid = *peer;
+ ret->is_friend = is_friend;
+ if (NULL != hello)
+ {
+ ret->hello = GNUNET_malloc (GNUNET_HELLO_size (hello));
+ GNUNET_memcpy (ret->hello,
+ hello,
+ GNUNET_HELLO_size (hello));
+ }
+ GNUNET_break (GNUNET_OK ==
+ GNUNET_CONTAINER_multipeermap_put (peers,
+ peer,
+ ret,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
+ return ret;
}
/**
- * Check if an additional connection from the given peer is allowed.
+ * Setup bloom filter for the given peer entry.
+ *
+ * @param peer entry to initialize
*/
-static int
-is_connection_allowed (const struct GNUNET_PeerIdentity * peer)
+static void
+setup_filter (struct Peer *peer)
{
- if (0 == memcmp (&my_identity, peer, sizeof (struct GNUNET_PeerIdentity)))
- return GNUNET_SYSERR; /* disallow connections to self */
- if (is_friend (peer))
- return GNUNET_OK;
- if (GNUNET_YES == friends_only)
- return GNUNET_SYSERR;
- if (friend_count >= minimum_friend_count)
- return GNUNET_OK;
- return GNUNET_SYSERR;
+ struct GNUNET_HashCode hc;
+
+ /* 2^{-5} chance of not sending a HELLO to a peer is
+ * acceptably small (if the filter is 50% full);
+ * 64 bytes of memory are small compared to the rest
+ * of the data structure and would only really become
+ * "useless" once a HELLO has been passed on to ~100
+ * other peers, which is likely more than enough in
+ * any case; hence 64, 5 as bloomfilter parameters. */
+ peer->filter = GNUNET_CONTAINER_bloomfilter_init (NULL, 64, 5);
+ peer->filter_expiration =
+ GNUNET_TIME_relative_to_absolute
+ (HELLO_ADVERTISEMENT_MIN_REPEAT_FREQUENCY);
+ /* never send a peer its own HELLO */
+ GNUNET_CRYPTO_hash (&peer->pid,
+ sizeof (struct GNUNET_PeerIdentity),
+ &hc);
+ GNUNET_CONTAINER_bloomfilter_add (peer->filter, &hc);
}
/**
- * Method called whenever a peer connects.
+ * Closure for #find_advertisable_hello().
+ */
+struct FindAdvHelloContext
+{
+
+ /**
+ * Peer we want to advertise to.
+ */
+ struct Peer *peer;
+
+ /**
+ * Where to store the result (peer selected for advertising).
+ */
+ struct Peer *result;
+
+ /**
+ * Maximum HELLO size we can use right now.
+ */
+ size_t max_size;
+
+ struct GNUNET_TIME_Relative next_adv;
+};
+
+
+/**
+ * Find a peer that would be reasonable for advertising.
*
* @param cls closure
- * @param peer peer identity this notification is about
+ * @param pid identity of a peer
+ * @param value 'struct Peer*' for the peer we are considering
+ * @return #GNUNET_YES (continue iteration)
*/
-static void connect_notify (void *cls,
- const struct
- GNUNET_PeerIdentity * peer)
+static int
+find_advertisable_hello (void *cls,
+ const struct GNUNET_PeerIdentity *pid,
+ void *value)
{
- struct PeerList *pos;
-
- connection_count++;
- pos = friends;
- while (pos != NULL)
- {
- if ( (GNUNET_YES == pos->is_friend) &&
- (0 == memcmp (&pos->id, peer, sizeof (struct GNUNET_PeerIdentity))) )
- {
- GNUNET_assert (GNUNET_NO == pos->is_connected);
- pos->is_connected = GNUNET_YES;
- pos->blacklisted_until.value = 0; /* remove blacklisting */
- friend_count++;
- return;
- }
- pos = pos->next;
- }
- pos = GNUNET_malloc (sizeof(struct PeerList));
- pos->id = *peer;
- pos->is_connected = GNUNET_YES;
- pos->next = friends;
- friends = pos;
- if (GNUNET_OK != is_connection_allowed (peer))
- force_disconnect (peer);
+ struct FindAdvHelloContext *fah = cls;
+ struct Peer *pos = value;
+ struct GNUNET_TIME_Relative rst_time;
+ struct GNUNET_HashCode hc;
+ size_t hs;
+
+ if (pos == fah->peer)
+ return GNUNET_YES;
+ if (pos->hello == NULL)
+ return GNUNET_YES;
+ rst_time = GNUNET_TIME_absolute_get_remaining (pos->filter_expiration);
+ if (0 == rst_time.rel_value_us)
+ {
+ /* time to discard... */
+ GNUNET_CONTAINER_bloomfilter_free (pos->filter);
+ setup_filter (pos);
+ }
+ fah->next_adv = GNUNET_TIME_relative_min (rst_time, fah->next_adv);
+ hs = GNUNET_HELLO_size (pos->hello);
+ if (hs > fah->max_size)
+ return GNUNET_YES;
+ GNUNET_CRYPTO_hash (&fah->peer->pid,
+ sizeof (struct GNUNET_PeerIdentity), &hc);
+ if (GNUNET_NO ==
+ GNUNET_CONTAINER_bloomfilter_test (pos->filter,
+ &hc))
+ fah->result = pos;
+ return GNUNET_YES;
}
/**
- * Disconnect from all non-friends (we're below quota).
+ * Calculate when we would like to send the next HELLO to this
+ * peer and ask for it.
+ *
+ * @param cls for which peer to schedule the HELLO
*/
static void
-drop_non_friends ()
+schedule_next_hello (void *cls)
{
- struct PeerList *pos;
+ struct Peer *pl = cls;
+ struct FindAdvHelloContext fah;
+ struct GNUNET_MQ_Envelope *env;
+ size_t want;
+ struct GNUNET_TIME_Relative delay;
+ struct GNUNET_HashCode hc;
- pos = friends;
- while (pos != NULL)
- {
- if (GNUNET_NO == pos->is_friend)
- {
- GNUNET_assert (GNUNET_YES == pos->is_connected);
- force_disconnect (&pos->id);
- }
- pos = pos->next;
- }
+ pl->hello_delay_task = NULL;
+ GNUNET_assert (NULL != pl->mq);
+ /* find applicable HELLOs */
+ fah.peer = pl;
+ fah.result = NULL;
+ fah.max_size = GNUNET_SERVER_MAX_MESSAGE_SIZE - 1;
+ fah.next_adv = GNUNET_TIME_UNIT_FOREVER_REL;
+ GNUNET_CONTAINER_multipeermap_iterate (peers,
+ &find_advertisable_hello,
+ &fah);
+ pl->hello_delay_task =
+ GNUNET_SCHEDULER_add_delayed (fah.next_adv,
+ &schedule_next_hello,
+ pl);
+ if (NULL == fah.result)
+ return;
+ delay = GNUNET_TIME_absolute_get_remaining (pl->next_hello_allowed);
+ if (0 != delay.rel_value_us)
+ return;
+
+ want = GNUNET_HELLO_size (fah.result->hello);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending HELLO with %u bytes",
+ (unsigned int) want);
+ env = GNUNET_MQ_msg_copy (&fah.result->hello->header);
+ GNUNET_MQ_send (pl->mq,
+ env);
+
+ /* avoid sending this one again soon */
+ GNUNET_CRYPTO_hash (&pl->pid,
+ sizeof (struct GNUNET_PeerIdentity),
+ &hc);
+ GNUNET_CONTAINER_bloomfilter_add (fah.result->filter,
+ &hc);
+
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# HELLO messages gossipped"),
+ 1,
+ GNUNET_NO);
+ /* prepare to send the next one */
+ pl->next_hello_allowed
+ = GNUNET_TIME_relative_to_absolute (HELLO_ADVERTISEMENT_MIN_FREQUENCY);
+ if (NULL != pl->hello_delay_task)
+ GNUNET_SCHEDULER_cancel (pl->hello_delay_task);
+ pl->hello_delay_task
+ = GNUNET_SCHEDULER_add_now (&schedule_next_hello,
+ pl);
}
/**
- * Method called whenever a peer disconnects.
+ * Cancel existing requests for sending HELLOs to this peer
+ * and recalculate when we should send HELLOs to it based
+ * on our current state (something changed!).
+ *
+ * @param cls closure `struct Peer` to skip, or NULL
+ * @param pid identity of a peer
+ * @param value `struct Peer *` for the peer
+ * @return #GNUNET_YES (always)
+ */
+static int
+reschedule_hellos (void *cls,
+ const struct GNUNET_PeerIdentity *pid,
+ void *value)
+{
+ struct Peer *peer = value;
+ struct Peer *skip = cls;
+
+ if (skip == peer)
+ return GNUNET_YES;
+ if (NULL == peer->mq)
+ return GNUNET_YES;
+ if (NULL != peer->hello_delay_task)
+ {
+ GNUNET_SCHEDULER_cancel (peer->hello_delay_task);
+ peer->hello_delay_task = NULL;
+ }
+ peer->hello_delay_task =
+ GNUNET_SCHEDULER_add_now (&schedule_next_hello, peer);
+ return GNUNET_YES;
+}
+
+
+/**
+ * Method called whenever a peer connects.
*
* @param cls closure
* @param peer peer identity this notification is about
+ * @param mq message queue for communicating with @a peer
+ * @return our `struct Peer` for @a peer
*/
-static void disconnect_notify (void *cls,
- const struct
- GNUNET_PeerIdentity * peer)
+static void *
+connect_notify (void *cls,
+ const struct GNUNET_PeerIdentity *peer,
+ struct GNUNET_MQ_Handle *mq)
{
- struct PeerList *pos;
- struct PeerList *prev;
+ struct Peer *pos;
+ uint64_t flags;
+ const void *extra;
- connection_count--;
- pos = friends;
- prev = NULL;
- while (pos != NULL)
- {
- if (0 == memcmp (&pos->id, peer, sizeof (struct GNUNET_PeerIdentity)))
- {
- GNUNET_assert (GNUNET_YES == pos->is_connected);
- pos->is_connected = GNUNET_NO;
- if (GNUNET_YES == pos->is_friend)
- {
- friend_count--;
- if (friend_count < minimum_friend_count)
- {
- /* disconnect from all non-friends */
- drop_non_friends ();
- attempt_connect (peer, pos);
- }
- }
- else
- {
- /* free entry */
- if (prev == NULL)
- friends = pos->next;
- else
- prev->next = pos->next;
- GNUNET_free (pos);
- }
- return;
- }
- prev = pos;
- pos = pos->next;
- }
- GNUNET_break (0);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Core told us that we are connecting to `%s'\n",
+ GNUNET_i2s (peer));
+ if (0 == memcmp (&my_identity,
+ peer,
+ sizeof (struct GNUNET_PeerIdentity)))
+ return NULL;
+ extra = GNUNET_CORE_get_mq_options (GNUNET_YES,
+ GNUNET_CORE_PRIO_BEST_EFFORT,
+ &flags);
+ GNUNET_MQ_set_options (mq,
+ flags,
+ extra);
+ connection_count++;
+ GNUNET_STATISTICS_set (stats,
+ gettext_noop ("# peers connected"),
+ connection_count,
+ GNUNET_NO);
+ pos = GNUNET_CONTAINER_multipeermap_get (peers,
+ peer);
+ if (NULL == pos)
+ {
+ pos = make_peer (peer,
+ NULL,
+ GNUNET_NO);
+ }
+ else
+ {
+ GNUNET_assert (NULL == pos->mq);
+ }
+ pos->mq = mq;
+ if (pos->is_friend)
+ {
+ friend_count++;
+ if ( (friend_count == minimum_friend_count) &&
+ (GNUNET_YES != friends_only) )
+ whitelist_peers ();
+ GNUNET_STATISTICS_set (stats,
+ gettext_noop ("# friends connected"),
+ friend_count,
+ GNUNET_NO);
+ }
+ reschedule_hellos (NULL,
+ peer,
+ pos);
+ return pos;
}
/**
- * Find more peers that we should connect to and ask the
- * core to establish connections.
+ * Try to add more peers to our connection set.
+ *
+ * @param cls closure, not used
+ * @param pid identity of a peer
+ * @param value `struct Peer *` for the peer
+ * @return #GNUNET_YES (continue to iterate)
*/
-static void
-find_more_peers (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc);
+static int
+try_add_peers (void *cls,
+ const struct GNUNET_PeerIdentity *pid,
+ void *value)
+{
+ struct Peer *pos = value;
+
+ attempt_connect (pos);
+ return GNUNET_YES;
+}
/**
- * Determine when we should try again to find more peers and
- * schedule the task.
+ * Add peers and schedule connection attempt
+ *
+ * @param cls unused, NULL
*/
static void
-schedule_peer_search ()
+add_peer_task (void *cls)
{
- struct GNUNET_TIME_Relative delay;
+ add_task = NULL;
- /* Typically, we try again every 15 minutes; the minimum period is
- 15s; if we are above the connection target, we reduce re-trying
- by the square of how much we are above; so for example, with 200%
- of the connection target we would only look for more peers once
- every hour (after all, we're quite busy processing twice as many
- connections as we intended to have); similarly, if we are at only
- 25% of our connectivity goal, we will try 16x as hard to connect
- (so roughly once a minute, plus the 15s minimum delay */
- delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
- 15 + 15 * 60 * connection_count * connection_count / target_connection_count / target_connection_count);
- GNUNET_SCHEDULER_add_delayed (sched,
- GNUNET_NO,
- GNUNET_SCHEDULER_PRIORITY_DEFAULT,
- GNUNET_SCHEDULER_NO_TASK,
- delay,
- &find_more_peers,
- NULL);
+ GNUNET_CONTAINER_multipeermap_iterate (peers,
+ &try_add_peers,
+ NULL);
}
+/**
+ * Method called whenever a peer disconnects.
+ *
+ * @param cls closure
+ * @param peer peer identity this notification is about
+ * @param internal_cls the `struct Peer` for this peer
+ */
+static void
+disconnect_notify (void *cls,
+ const struct GNUNET_PeerIdentity *peer,
+ void *internal_cls)
+{
+ struct Peer *pos = internal_cls;
+
+ if (NULL == pos)
+ return; /* myself, we're shutting down */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Core told us that we disconnected from `%s'\n",
+ GNUNET_i2s (peer));
+ if (NULL == pos->mq)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ pos->mq = NULL;
+ connection_count--;
+ if (NULL != pos->hello_delay_task)
+ {
+ GNUNET_SCHEDULER_cancel (pos->hello_delay_task);
+ pos->hello_delay_task = NULL;
+ }
+ GNUNET_STATISTICS_set (stats,
+ gettext_noop ("# peers connected"),
+ connection_count,
+ GNUNET_NO);
+ if (pos->is_friend)
+ {
+ friend_count--;
+ GNUNET_STATISTICS_set (stats,
+ gettext_noop ("# friends connected"),
+ friend_count,
+ GNUNET_NO);
+ }
+ if ( ( (connection_count < target_connection_count) ||
+ (friend_count < minimum_friend_count)) &&
+ (NULL == add_task) )
+ add_task = GNUNET_SCHEDULER_add_now (&add_peer_task,
+ NULL);
+ if ( (friend_count < minimum_friend_count) &&
+ (NULL == blacklist))
+ blacklist = GNUNET_TRANSPORT_blacklist (cfg,
+ &blacklist_check,
+ NULL);
+}
/**
* Iterator called on each address.
*
- * @param cls flag that we will set if we see any addresses.
+ * @param cls flag that we will set if we see any addresses
+ * @param address the address of the peer
+ * @param expiration when will the given address expire
+ * @return #GNUNET_SYSERR always, to terminate iteration
*/
static int
address_iterator (void *cls,
- const char *tname,
- struct GNUNET_TIME_Absolute expiration,
- const void *addr, size_t addrlen)
+ const struct GNUNET_HELLO_Address *address,
+ struct GNUNET_TIME_Absolute expiration)
{
int *flag = cls;
+
*flag = GNUNET_YES;
return GNUNET_SYSERR;
}
/**
- * We've gotten a HELLO from another peer.
- * Consider it for advertising.
+ * We've gotten a HELLO from another peer. Consider it for
+ * advertising.
+ *
+ * @param hello the HELLO we got
*/
static void
consider_for_advertising (const struct GNUNET_HELLO_Message *hello)
{
int have_address;
struct GNUNET_PeerIdentity pid;
- struct HelloList *pos;
+ struct GNUNET_TIME_Absolute dt;
+ struct GNUNET_HELLO_Message *nh;
+ struct Peer *peer;
uint16_t size;
+ if (GNUNET_OK != GNUNET_HELLO_get_id (hello, &pid))
+ {
+ GNUNET_break (0);
+ return;
+ }
+ if (0 == memcmp (&pid,
+ &my_identity,
+ sizeof (struct GNUNET_PeerIdentity)))
+ return; /* that's me! */
have_address = GNUNET_NO;
GNUNET_HELLO_iterate_addresses (hello,
- GNUNET_NO,
- &address_iterator,
- &have_address);
+ GNUNET_NO,
+ &address_iterator,
+ &have_address);
if (GNUNET_NO == have_address)
- return; /* no point in advertising this one... */
- GNUNET_break (GNUNET_OK == GNUNET_HELLO_get_id (hello, &pid));
- pos = hellos;
- while (pos != NULL)
- {
- if (0 == memcmp (&pos->id,
- &pid,
- sizeof(struct GNUNET_PeerIdentity)))
- return; /* duplicate, at least "mostly" */
- pos = pos->next;
- }
- size = GNUNET_HELLO_size (hello);
- pos = GNUNET_malloc (sizeof(struct HelloList) + size);
- pos->msg = (struct GNUNET_HELLO_Message*) &pos[1];
- memcpy (&pos->msg, hello, size);
- pos->id = pid;
- pos->expiration = GNUNET_TIME_relative_to_absolute (HELLO_ADVERTISEMENT_MIN_FREQUENCY);
- /* 2^{-5} chance of not sending a HELLO to a peer is
- acceptably small (if the filter is 50% full);
- 64 bytes of memory are small compared to the rest
- of the data structure and would only really become
- "useless" once a HELLO has been passed on to ~100
- other peers, which is likely more than enough in
- any case; hence 64, 5 as bloomfilter parameters. */
- pos->filter = GNUNET_CONTAINER_bloomfilter_load (NULL, 64, 5);
- /* never send a peer its own HELLO */
- GNUNET_CONTAINER_bloomfilter_add (pos->filter, &pos->id.hashPubKey);
- pos->next = hellos;
- hellos = pos;
+ return; /* no point in advertising this one... */
+ peer = GNUNET_CONTAINER_multipeermap_get (peers, &pid);
+ if (NULL == peer)
+ {
+ peer = make_peer (&pid,
+ hello,
+ GNUNET_NO);
+ }
+ else if (NULL != peer->hello)
+ {
+ dt = GNUNET_HELLO_equals (peer->hello,
+ hello,
+ GNUNET_TIME_absolute_get ());
+ if (dt.abs_value_us == GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us)
+ return; /* nothing new here */
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Found HELLO from peer `%s' for advertising\n",
+ GNUNET_i2s (&pid));
+ if (NULL != peer->hello)
+ {
+ nh = GNUNET_HELLO_merge (peer->hello,
+ hello);
+ GNUNET_free (peer->hello);
+ peer->hello = nh;
+ }
+ else
+ {
+ size = GNUNET_HELLO_size (hello);
+ peer->hello = GNUNET_malloc (size);
+ GNUNET_memcpy (peer->hello,
+ hello,
+ size);
+ }
+ if (NULL != peer->filter)
+ {
+ GNUNET_CONTAINER_bloomfilter_free (peer->filter);
+ peer->filter = NULL;
+ }
+ setup_filter (peer);
+ /* since we have a new HELLO to pick from, re-schedule all
+ * HELLO requests that are not bound by the HELLO send rate! */
+ GNUNET_CONTAINER_multipeermap_iterate (peers,
+ &reschedule_hellos,
+ peer);
}
/**
- * Peerinfo calls this function to let us know about a
- * possible peer that we might want to connect to.
+ * PEERINFO calls this function to let us know about a possible peer
+ * that we might want to connect to.
+ *
+ * @param cls closure (not used)
+ * @param peer potential peer to connect to
+ * @param hello HELLO for this peer (or NULL)
+ * @param err_msg NULL if successful, otherwise contains error message
*/
static void
process_peer (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_HELLO_Message *hello,
- uint32_t trust)
+ const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_HELLO_Message *hello,
+ const char *err_msg)
{
- struct PeerList *pos;
-
- if (peer == NULL)
- {
- /* last call, schedule 'find_more_peers' again... */
- schedule_peer_search ();
- return;
- }
- if (hello == NULL)
- {
- /* no HELLO known; can not connect, ignore! */
- return;
- }
+ struct Peer *pos;
+
+ if (NULL != err_msg)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ _("Error in communication with PEERINFO service: %s\n"),
+ err_msg);
+ GNUNET_PEERINFO_notify_cancel (peerinfo_notify);
+ peerinfo_notify = GNUNET_PEERINFO_notify (cfg,
+ GNUNET_NO,
+ &process_peer,
+ NULL);
+ return;
+ }
+ GNUNET_assert (NULL != peer);
if (0 == memcmp (&my_identity,
- peer, sizeof (struct GNUNET_PeerIdentity)))
- return; /* that's me! */
-
- consider_for_advertising (hello);
- pos = friends;
- while (pos != NULL)
+ peer,
+ sizeof (struct GNUNET_PeerIdentity)))
+ return; /* that's me! */
+ if (NULL == hello)
+ {
+ /* free existing HELLO, if any */
+ pos = GNUNET_CONTAINER_multipeermap_get (peers,
+ peer);
+ if (NULL != pos)
{
- if (0 == memcmp (&pos->id, peer, sizeof (struct GNUNET_PeerIdentity)))
- {
- if (GNUNET_YES == pos->is_connected)
- return;
- if (GNUNET_TIME_absolute_get_remaining (pos->blacklisted_until).value > 0)
- return; /* peer still blacklisted */
- if (GNUNET_YES == pos->is_friend)
- {
- attempt_connect (peer, pos);
- return;
- }
- }
- pos = pos->next;
+ GNUNET_free_non_null (pos->hello);
+ pos->hello = NULL;
+ if (NULL != pos->filter)
+ {
+ GNUNET_CONTAINER_bloomfilter_free (pos->filter);
+ pos->filter = NULL;
+ }
+ if ( (NULL == pos->mq) &&
+ (GNUNET_NO == pos->is_friend) )
+ free_peer (NULL,
+ &pos->pid,
+ pos);
}
- if (GNUNET_YES == friends_only)
- return;
- if (friend_count < minimum_friend_count)
return;
- attempt_connect (peer, NULL);
-}
-
-
-/**
- * Try to add more friends to our connection set.
- */
-static void
-try_add_friends ()
-{
- struct PeerList *pos;
-
- pos = friends;
- while (pos != NULL)
- {
- if ( (GNUNET_TIME_absolute_get_remaining (pos->blacklisted_until).value == 0) &&
- (GNUNET_YES == pos->is_friend) &&
- (GNUNET_YES != pos->is_connected) )
- attempt_connect (&pos->id, pos);
- pos = pos->next;
- }
-}
-
-
-/**
- * Discard peer entries for blacklisted peers
- * where the blacklisting has expired.
- */
-static void
-discard_old_blacklist_entries ()
-{
- struct PeerList *pos;
- struct PeerList *next;
- struct PeerList *prev;
-
- next = friends;
- prev = NULL;
- while (NULL != (pos = next))
- {
- next = pos->next;
- if ( (GNUNET_NO == pos->is_friend) &&
- (GNUNET_NO == pos->is_connected) &&
- (0 == GNUNET_TIME_absolute_get_remaining (pos->blacklisted_until).value) )
- {
- /* delete 'pos' from list */
- if (prev == NULL)
- friends = next;
- else
- prev->next = next;
- GNUNET_free (pos);
- }
- else
- {
- prev = pos;
- }
- }
-}
-
-
-/**
- * Find more peers that we should connect to and ask the
- * core to establish connections.
- */
-static void
-find_more_peers (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- discard_old_blacklist_entries ();
- if (target_connection_count <= connection_count)
- {
- schedule_peer_search ();
- return;
- }
- if ( (GNUNET_YES == friends_only) ||
- (friend_count < minimum_friend_count) )
- {
- try_add_friends ();
- schedule_peer_search ();
- return;
- }
- GNUNET_PEERINFO_for_all (cfg,
- sched,
- NULL,
- 0, GNUNET_TIME_UNIT_FOREVER_REL,
- &process_peer, NULL);
+ }
+ consider_for_advertising (hello);
+ pos = GNUNET_CONTAINER_multipeermap_get (peers,
+ peer);
+ if (NULL == pos)
+ pos = make_peer (peer,
+ hello,
+ GNUNET_NO);
+ attempt_connect (pos);
}
/**
- * Function called after GNUNET_CORE_connect has succeeded
+ * Function called after #GNUNET_CORE_connect has succeeded
* (or failed for good).
*
* @param cls closure
- * @param server handle to the server, NULL if we failed
* @param my_id ID of this peer, NULL if we failed
- * @param publicKey public key of this peer, NULL if we failed
*/
static void
core_init (void *cls,
- struct GNUNET_CORE_Handle * server,
- const struct GNUNET_PeerIdentity *
- my_id,
- const struct
- GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *
- publicKey)
+ const struct GNUNET_PeerIdentity *my_id)
{
- if (server == NULL)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("Failed to connect to core service, can not manage topology!\n"));
- return;
- }
- handle = server;
+ if (NULL == my_id)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to connect to core service, can not manage topology!\n"));
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
my_identity = *my_id;
- if (autoconnect)
- GNUNET_SCHEDULER_add_delayed (sched,
- GNUNET_NO,
- GNUNET_SCHEDULER_PRIORITY_DEFAULT,
- GNUNET_SCHEDULER_NO_TASK,
- GNUNET_TIME_UNIT_SECONDS /* give core time to tell us about existing connections */,
- &find_more_peers,
- NULL);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "I am peer `%s'\n",
+ GNUNET_i2s (my_id));
+ peerinfo_notify = GNUNET_PEERINFO_notify (cfg,
+ GNUNET_NO,
+ &process_peer,
+ NULL);
}
/**
- * gnunet-daemon-topology command line options.
+ * Process friend found in FRIENDS file.
+ *
+ * @param cls pointer to an `unsigned int` to be incremented per friend found
+ * @param pid identity of the friend
*/
-static struct GNUNET_GETOPT_CommandLineOption options[] = {
- GNUNET_GETOPT_OPTION_END
-};
+static void
+handle_friend (void *cls,
+ const struct GNUNET_PeerIdentity *pid)
+{
+ unsigned int *entries_found = cls;
+ struct Peer *fl;
+
+ if (0 == memcmp (pid,
+ &my_identity,
+ sizeof (struct GNUNET_PeerIdentity)))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("Found myself `%s' in friend list (useless, ignored)\n"),
+ GNUNET_i2s (pid));
+ return;
+ }
+ (*entries_found)++;
+ fl = make_peer (pid, NULL, GNUNET_YES);
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ _("Found friend `%s' in configuration\n"),
+ GNUNET_i2s (&fl->pid));
+}
/**
static void
read_friends_file (const struct GNUNET_CONFIGURATION_Handle *cfg)
{
- char *fn;
- char *data;
- size_t pos;
- GNUNET_HashCode hc;
- struct stat frstat;
- struct GNUNET_CRYPTO_HashAsciiEncoded enc;
unsigned int entries_found;
- struct PeerList *fl;
+ entries_found = 0;
if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_filename (cfg,
- "TOPOLOGY",
- "FRIENDS",
- &fn))
- {
+ GNUNET_FRIENDS_parse (cfg,
+ &handle_friend,
+ &entries_found))
+ {
+ if ( (GNUNET_YES == friends_only) ||
+ (minimum_friend_count > 0))
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Option `%s' in section `%s' not specified!\n"),
- "FRIENDS",
- "TOPOLOGY");
- return;
- }
- if (GNUNET_OK != GNUNET_DISK_file_test (fn))
- GNUNET_DISK_fn_write (fn, NULL, 0, GNUNET_DISK_PERM_USER_READ
- | GNUNET_DISK_PERM_USER_WRITE);
- if (0 != STAT (fn, &frstat))
- {
- if ((friends_only) || (minimum_friend_count > 0))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("Could not read friends list `%s'\n"), fn);
- GNUNET_free (fn);
- return;
- }
- }
- if (frstat.st_size == 0)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Friends file `%s' is empty.\n"),
- fn);
- GNUNET_free (fn);
- return;
- }
- data = GNUNET_malloc_large (frstat.st_size);
- if (frstat.st_size !=
- GNUNET_DISK_fn_read (fn, data, frstat.st_size))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("Failed to read friends list from `%s'\n"), fn);
- GNUNET_free (fn);
- GNUNET_free (data);
- return;
- }
- entries_found = 0;
- pos = 0;
- while ((pos < frstat.st_size) && isspace (data[pos]))
- pos++;
- while ((frstat.st_size >= sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)) &&
- (pos <= frstat.st_size - sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)))
- {
- memcpy (&enc, &data[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
- if (!isspace (enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1]))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Syntax error in topology specification at offset %llu, skipping bytes.\n"),
- (unsigned long long) pos);
- pos++;
- while ((pos < frstat.st_size) && (!isspace (data[pos])))
- pos++;
- continue;
- }
- enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
- if (GNUNET_OK != GNUNET_CRYPTO_hash_from_string ((char *) &enc, &hc))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Syntax error in topology specification at offset %llu, skipping bytes `%s'.\n"),
- (unsigned long long) pos,
- &enc);
- }
- else
- {
- entries_found++;
- fl = GNUNET_malloc (sizeof(struct PeerList));
- fl->is_friend = GNUNET_YES;
- fl->id.hashPubKey = hc;
- fl->next = friends;
- friends = fl;
- }
- pos = pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded);
- while ((pos < frstat.st_size) && isspace (data[pos]))
- pos++;
- }
- GNUNET_free (data);
- GNUNET_free (fn);
+ _("Encountered errors parsing friends list!\n"));
+ }
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# friends in configuration"),
+ entries_found,
+ GNUNET_NO);
if ( (minimum_friend_count > entries_found) &&
- (friends_only == GNUNET_NO) )
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Fewer friends specified than required by minimum friend count. Will only connect to friends.\n"));
- }
+ (GNUNET_NO == friends_only) )
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("Fewer friends specified than required by minimum friend count. Will only connect to friends.\n"));
+ }
if ( (minimum_friend_count > target_connection_count) &&
- (friends_only == GNUNET_NO) )
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("More friendly connections required than target total number of connections.\n"));
- }
+ (GNUNET_NO == friends_only))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("More friendly connections required than target total number of connections.\n"));
+ }
}
/**
- * This function is called whenever an encrypted HELLO message is
- * received.
- *
- * @param cls closure
- * @param peer the other peer involved (sender or receiver, NULL
- * for loopback messages where we are both sender and receiver)
- * @param message the actual HELLO message
- * @return GNUNET_OK to keep the connection open,
- * GNUNET_SYSERR to close it (signal serious error)
+ * Hello offer complete. Clean up.
*/
-static int
-handle_encrypted_hello (void *cls,
- const struct GNUNET_PeerIdentity * other,
- const struct GNUNET_MessageHeader *
- message)
+static void
+done_offer_hello (void *cls)
{
- if (transport != NULL)
- GNUNET_TRANSPORT_offer_hello (transport,
- message);
- return GNUNET_OK;
+ oh = NULL;
}
/**
- * Peerinfo calls this function to let us know about a
- * possible peer that we might want to connect to.
+ * This function is called whenever an encrypted HELLO message is
+ * received.
+ *
+ * @param cls closure with the peer identity of the sender
+ * @param message the actual HELLO message
+ * @return #GNUNET_OK if @a message is well-formed
+ * #GNUNET_SYSERR if @a message is invalid
*/
-static void
-gather_hello_callback (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_HELLO_Message *hello,
- uint32_t trust)
+static int
+check_hello (void *cls,
+ const struct GNUNET_HELLO_Message *message)
{
- if (peer == NULL)
- {
- hello_gathering_active = GNUNET_NO;
- return;
- }
- if (hello != NULL)
- consider_for_advertising (hello);
+ struct GNUNET_PeerIdentity pid;
+
+ if (GNUNET_OK !=
+ GNUNET_HELLO_get_id (message,
+ &pid))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ return GNUNET_OK;
}
/**
- * Function to fill send buffer with HELLO.
+ * This function is called whenever an encrypted HELLO message is
+ * received.
*
- * @param receiver the receiver of the message
- * @param position is the reference to the
- * first unused position in the buffer where GNUnet is building
- * the message
- * @param padding is the number of bytes left in that buffer.
- * @return the number of bytes written to
- * that buffer (must be a positive number).
+ * @param cls closure with the peer identity of the sender
+ * @param message the actual HELLO message
*/
-static unsigned int
-hello_advertising (void *cls,
- const struct GNUNET_PeerIdentity *
- receiver,
- void *position,
- xsize_t padding)
+static void
+handle_hello (void *cls,
+ const struct GNUNET_HELLO_Message *message)
{
- struct PeerList *pl;
- struct HelloList *pos;
- struct HelloList *prev;
- struct HelloList *next;
- uint16_t size;
+ const struct GNUNET_PeerIdentity *other = cls;
+ struct Peer *peer;
+ struct GNUNET_PeerIdentity pid;
- pl = friends;
- while (pl != NULL)
- {
- if (0 == memcmp (&pl->id, receiver, sizeof (struct GNUNET_PeerIdentity)))
- break;
- pl = pl->next;
- }
- if (pl == NULL)
- {
- GNUNET_break (0);
- return 0;
- }
- /* find applicable HELLOs */
- prev = NULL;
- next = hellos;
- while (NULL != (pos = next))
- {
- next = pos->next;
- if (GNUNET_NO ==
- GNUNET_CONTAINER_bloomfilter_test (pos->filter,
- &receiver->hashPubKey))
- break;
- if (0 == GNUNET_TIME_absolute_get_remaining (pos->expiration).value)
- {
- /* time to discard... */
- if (prev != NULL)
- prev->next = next;
- else
- hellos = next;
- GNUNET_CONTAINER_bloomfilter_free (pos->filter);
- GNUNET_free (pos);
- }
- else
- {
- prev = pos;
- }
- }
- if (pos != NULL)
- {
- size = GNUNET_HELLO_size (pos->msg);
- if (size < padding)
- {
- memcpy (position, pos->msg, size);
- GNUNET_CONTAINER_bloomfilter_add (pos->filter,
- &receiver->hashPubKey);
- }
- else
- {
- size = 0;
- }
- return size;
- }
- if ( (GNUNET_NO == hello_gathering_active) &&
- (GNUNET_TIME_absolute_get_duration (last_hello_gather_time).value >
- MIN_HELLO_GATHER_DELAY.value) )
- {
- hello_gathering_active = GNUNET_YES;
- last_hello_gather_time = GNUNET_TIME_absolute_get();
- GNUNET_PEERINFO_for_all (cfg,
- sched,
- NULL,
- 0, GNUNET_TIME_UNIT_FOREVER_REL,
- &gather_hello_callback, NULL);
- }
- return 0;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received encrypted HELLO from peer `%s'",
+ GNUNET_i2s (other));
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_HELLO_get_id (message,
+ &pid));
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# HELLO messages received"),
+ 1,
+ GNUNET_NO);
+ peer = GNUNET_CONTAINER_multipeermap_get (peers,
+ &pid);
+ if (NULL == peer)
+ {
+ if ( (GNUNET_YES == friends_only) ||
+ (friend_count < minimum_friend_count) )
+ return;
+ }
+ else
+ {
+ if ( (GNUNET_YES != peer->is_friend) &&
+ (GNUNET_YES == friends_only) )
+ return;
+ if ((GNUNET_YES != peer->is_friend) &&
+ (friend_count < minimum_friend_count))
+ return;
+ }
+ if (NULL != oh)
+ GNUNET_TRANSPORT_offer_hello_cancel (oh);
+ oh = GNUNET_TRANSPORT_offer_hello (cfg,
+ &message->header,
+ &done_offer_hello,
+ NULL);
}
/**
* Last task run during shutdown. Disconnects us from
* the transport and core.
+ *
+ * @param cls unused, NULL
*/
static void
-cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+cleaning_task (void *cls)
{
- struct PeerList *pl;
-
- GNUNET_TRANSPORT_disconnect (transport);
- transport = NULL;
- GNUNET_CORE_disconnect (handle);
- handle = NULL;
- while (NULL != (pl = friends))
- {
- friends = pl->next;
- GNUNET_free (pl);
- }
+ if (NULL != peerinfo_notify)
+ {
+ GNUNET_PEERINFO_notify_cancel (peerinfo_notify);
+ peerinfo_notify = NULL;
+ }
+ if (NULL != handle)
+ {
+ GNUNET_CORE_disconnect (handle);
+ handle = NULL;
+ }
+ whitelist_peers ();
+ if (NULL != add_task)
+ {
+ GNUNET_SCHEDULER_cancel (add_task);
+ add_task = NULL;
+ }
+ if (NULL != oh)
+ {
+ GNUNET_TRANSPORT_offer_hello_cancel (oh);
+ oh = NULL;
+ }
+ GNUNET_CONTAINER_multipeermap_iterate (peers,
+ &free_peer,
+ NULL);
+ GNUNET_CONTAINER_multipeermap_destroy (peers);
+ peers = NULL;
+ if (NULL != ats)
+ {
+ GNUNET_ATS_connectivity_done (ats);
+ ats = NULL;
+ }
+ if (NULL != stats)
+ {
+ GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
+ stats = NULL;
+ }
}
* Main function that will be run.
*
* @param cls closure
- * @param s the scheduler to use
* @param args remaining command-line arguments
* @param cfgfile name of the configuration file used (for saving, can be NULL!)
* @param c configuration
*/
static void
run (void *cls,
- struct GNUNET_SCHEDULER_Handle * s,
char *const *args,
const char *cfgfile,
- const struct GNUNET_CONFIGURATION_Handle * c)
+ const struct GNUNET_CONFIGURATION_Handle *c)
{
- struct GNUNET_CORE_MessageHandler handlers[] =
- {
- { &handle_encrypted_hello, GNUNET_MESSAGE_TYPE_HELLO, 0},
- { NULL, 0, 0 }
- };
+ struct GNUNET_MQ_MessageHandler handlers[] = {
+ GNUNET_MQ_hd_var_size (hello,
+ GNUNET_MESSAGE_TYPE_HELLO,
+ struct GNUNET_HELLO_Message,
+ NULL),
+ GNUNET_MQ_handler_end ()
+ };
unsigned long long opt;
- sched = s;
cfg = c;
- autoconnect = GNUNET_CONFIGURATION_get_value_yesno (cfg,
- "TOPOLOGY",
- "AUTOCONNECT");
- friends_only = GNUNET_CONFIGURATION_get_value_yesno (cfg,
- "TOPOLOGY",
- "FRIENDS-ONLY");
+ stats = GNUNET_STATISTICS_create ("topology", cfg);
+ friends_only =
+ GNUNET_CONFIGURATION_get_value_yesno (cfg,
+ "TOPOLOGY",
+ "FRIENDS-ONLY");
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_number (cfg,
- "TOPOLOGY",
- "MINIMUM-FRIENDS",
- &opt))
+ "TOPOLOGY",
+ "MINIMUM-FRIENDS",
+ &opt))
opt = 0;
minimum_friend_count = (unsigned int) opt;
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_number (cfg,
- "TOPOLOGY",
- "TARGET-CONNECTION-COUNT",
- &opt))
+ "TOPOLOGY",
+ "TARGET-CONNECTION-COUNT",
+ &opt))
opt = 16;
target_connection_count = (unsigned int) opt;
-
- if ( (friends_only == GNUNET_YES) ||
- (minimum_friend_count > 0) )
- read_friends_file (cfg);
-
- transport = GNUNET_TRANSPORT_connect (sched,
- cfg,
- NULL,
- NULL,
- NULL,
- NULL);
- GNUNET_CORE_connect (sched,
- cfg,
- GNUNET_TIME_UNIT_FOREVER_REL,
- NULL,
- &core_init,
- &connect_notify,
- &disconnect_notify,
- &hello_advertising,
- NULL, GNUNET_NO,
- NULL, GNUNET_NO,
- handlers);
-
- GNUNET_SCHEDULER_add_delayed (sched,
- GNUNET_YES,
- GNUNET_SCHEDULER_PRIORITY_IDLE,
- GNUNET_SCHEDULER_NO_TASK,
- GNUNET_TIME_UNIT_FOREVER_REL,
- &cleaning_task, NULL);
+ peers = GNUNET_CONTAINER_multipeermap_create (target_connection_count * 2,
+ GNUNET_NO);
+ read_friends_file (cfg);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Topology would like %u connections with at least %u friends\n",
+ target_connection_count,
+ minimum_friend_count);
+ if ( (friend_count < minimum_friend_count) &&
+ (NULL == blacklist))
+ blacklist = GNUNET_TRANSPORT_blacklist (cfg,
+ &blacklist_check,
+ NULL);
+ ats = GNUNET_ATS_connectivity_init (cfg);
+ handle = GNUNET_CORE_connect (cfg,
+ NULL,
+ &core_init,
+ &connect_notify,
+ &disconnect_notify,
+ handlers);
+ GNUNET_SCHEDULER_add_shutdown (&cleaning_task,
+ NULL);
+ if (NULL == handle)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to connect to `%s' service.\n"),
+ "core");
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
}
int
main (int argc, char *const *argv)
{
+ static const struct GNUNET_GETOPT_CommandLineOption options[] = {
+ GNUNET_GETOPT_OPTION_END
+ };
int ret;
- ret = (GNUNET_OK ==
- GNUNET_PROGRAM_run (argc,
- argv,
- "topology",
- _("GNUnet topology control (maintaining P2P mesh and F2F constraints)"),
- options,
- &run, NULL)) ? 0 : 1;
+ if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
+ return 2;
+
+ ret =
+ (GNUNET_OK ==
+ GNUNET_PROGRAM_run (argc, argv,
+ "gnunet-daemon-topology",
+ _("GNUnet topology control"),
+ options, &run, NULL)) ? 0 : 1;
+ GNUNET_free ((void*) argv);
return ret;
}
+
+#if defined(LINUX) && defined(__GLIBC__)
+#include <malloc.h>
+
+/**
+ * MINIMIZE heap size (way below 128k) since this process doesn't need much.
+ */
+void __attribute__ ((constructor))
+GNUNET_ARM_memory_init ()
+{
+ mallopt (M_TRIM_THRESHOLD, 4 * 1024);
+ mallopt (M_TOP_PAD, 1 * 1024);
+ malloc_trim (0);
+}
+#endif
+
/* end of gnunet-daemon-topology.c */
projects / oweals / gnunet.git / blobdiff